High-strength antistatic plasticized polyvinyl chloride transparent film and preparation method thereof

Abstract

The invention discloses a high-strength antistatic plasticized polyvinyl chloride transparent film and a preparation method thereof.The transparent film is excellent in comprehensive performance and has the advantages of being high in mechanical strength, high in elasticity, high in visible light transmittance, low in haze, good in cold resistance, resistant to water extraction, stable in antistatic effect for a long time and the like; as high-cost raw materials such as PNBR are not used in the formula, the formula is relatively simple, the preparation process is simplified, and the manufacturing cost of the functional film is effectively reduced. The high-strength antistatic plasticized polyvinyl chloride transparent film is prepared from the following raw materials in parts by mass: 100 parts of polyvinyl chloride resin, 30-45 parts of an antistatic plasticizer, 10-25 parts of a non-static and non-cold-resistant plasticizer, 10-15 parts of a cold-resistant plasticizer, 2.0-3.5 parts of an ionic liquid polymer, 1.0-1.5 parts of a liquid composite heat stabilizer, 0.5-1.5 parts of a processing aid and 0.3-0.5 part of a lubricant.

Description

Technical Field

[0001] The present invention relates to a polyvinyl chloride functional film and a preparation method thereof, and more particularly to a high-strength antistatic plasticized polyvinyl chloride transparent film and a preparation method thereof. Background Art

[0002] Static electricity refers to a charge in a static state, which is a phenomenon of uneven distribution of charges on the surface or inside of an object. The generation of static electricity usually requires the following two conditions: ① There is contact or friction between the surfaces of two objects; ② At least one surface of the object has a relatively high resistance to electric current (i.e., an electrical insulator). It is the difference in the electrical insulation properties of these two objects and the resulting contact or friction that cause the uneven distribution of charges on the surfaces of the two contacting objects, thus forming static electricity. In addition, static electricity can also be generated by induction. When a charged insulator approaches a conductive object, there will be induced charges on the conductor, thereby generating static electricity. The generation mechanism and effects of static electricity have been widely applied in many fields. For example: the electrostatic dust removal technology that effectively adsorbs and collects dust particles in the air based on the principle of static electricity to purify the air; the electrostatic copying technology that transfers toner to paper based on the principle of the action of static electricity; the automotive industry uses electrostatic technology to effectively spray paint or coating evenly on the surfaces of automotive objects with large areas and complex shapes, etc. However, in the industrial sector, the generation of static electricity can also cause harm. For example, in the production, transportation, and use environments of flammable and explosive petrochemical products, the accumulation of static electricity may lead to fires or explosions; during the production process of electronic and electrical products, when devices encapsulated with resins, paint films, and plastic films are placed in packages for transportation, static electricity will be generated during the friction between the device surface and the packaging material and during the peeling process in later use, affecting the quality of electronic and electrical products. In order to avoid accidents such as fires, explosions, or product damage caused by the generation of static electricity, special methods are needed for static electricity elimination and electrostatic protection of products. In recent years, with the multi-functionalization of high-end electronic products, their product value has become higher and higher. Therefore, it is particularly important to avoid a decline in product quality or damage caused by static electricity in many links such as production, transportation, storage, and sales. The high-end electronic product manufacturing industry urgently needs high-performance and multi-functional antistatic films, such as high antistatic performance (low surface resistivity and volume resistivity) and its long-term stability (the antistatic performance is less affected by temperature and humidity, and has good water extraction resistance), high mechanical strength (high tensile strength, tear strength, and elongation at break), high transparency (high visible light transmittance and low haze), high elasticity (low permanent deformation), and good low-temperature resistance (resistance to low-temperature impact and low glass transition temperature) to meet the needs of the high-end electronic product production industry.

[0003] Polyvinyl chloride (PVC) resin, especially the PVC resin produced by suspension polymerization technology, does not contain emulsifiers in its composition. Its special amorphous structure and high purity endow the PVC resin with good visible light transmittance, electrical insulation performance, low haze, and good mechanical strength, making it one of the ideal materials for preparing transparent films. The volume resistivity (volume resistance coefficient) of PVC is usually above 10 14 Ω·m, and the corresponding surface resistivity (surface resistance coefficient) is also between 10 13 -10 16 Ω, with excellent electrical insulation performance. The electrical insulation characteristics of plasticized PVC plastic products added with plasticizers enable their wide application in fields such as wire and cable. In order to meet the antistatic use requirements of plasticized PVC transparent films in specific occasions in industries such as electronic appliances, machinery manufacturing, automobiles, and petrochemicals, a large number of reports have been made.

[0004] For example: The Chinese invention patent with the publication number CN104403234A and the patent name "A Polyvinyl Chloride Film with Permanent Antistatic Function" discloses the use of 100 parts of PVC resin with a polymerization degree of 1000 - 1500, 30 - 70 parts of dioctyl phthalate (DOP, also known as DEHP) plasticizer, 0.2 - 3 parts of permanent polyethylene oxide - epichlorohydrin copolymer (PEO - ECH) antistatic agent, 1.5 - 5 parts of barium - cadmium - zinc composite stabilizer, 0.3 - 1 part of ultraviolet light absorber, 0.7 - 2 parts of antioxidant, and an appropriate amount of colorant to prepare a polyvinyl chloride film with a surface resistance of 10 8 Ω and a permanent antistatic function. This published patent does not further characterize the relationship between the surface resistance of the film and its placement conditions (such as time, temperature, humidity, or before and after water extraction, etc.), nor does it test the properties such as visible light transmittance, haze, mechanical strength, and volume resistance coefficient of the film, and does not test and characterize the characteristic properties such as cold resistance (such as glass transition temperature) and elasticity (such as elongation at break permanent deformation or compression permanent deformation). The literature Journal of Applied Polymer Science, 2024, 141(40):

[0005] E56021 discloses that 100 parts of suspension PVC resin with an average degree of polymerization of 1300 is used as the matrix, and 60 parts of each of plasticizers dibutyl diglycol adipate (DBEEA), bis(2-ethylhexyl) phthalate (DEHP), diisononyl phthalate (DINP), bis(2-propylheptyl) phthalate (DPHP), trioctyl trimellitate (TOTM), polyester plasticizer (PPA) and functional additives such as stabilizers are added respectively to prepare plasticized PVC transparent films containing different plasticizers. The effects of factors such as plasticizer variety, molecular structure and polarity on the surface resistivity, volume resistivity, visible light transmittance, haze and mechanical properties of the films are studied comparatively. The research results show that the plasticized PVC film prepared with the antistatic plasticizer DBEEA has excellent antistatic performance, and its surface resistivity and volume resistivity are 1.2×10 10 Ω and 1.0×10 7 Ω·m respectively, while the corresponding surface resistivity and volume resistivity of the PVC films prepared with the other 5 plasticizers are in the range of 10 13～15 Ω and 10 9～11 Ω·m. After the plasticized PVC film prepared with the antistatic plasticizer DBEEA is placed in air for 1 to 4 weeks, the mass, surface resistivity and volume resistivity of the film remain almost unchanged. However, after being soaked in distilled water and detergent aqueous solution for 1 to 4 weeks, the mass, surface resistivity and volume resistivity of the film change significantly. Especially after being soaked in distilled water and detergent aqueous solution for 4 weeks, the mass of the film drops to 19.65% and 18.78% respectively, the surface resistivity rises to 4.6×10 12 Ω and 5.5×10 12 Ω respectively, and the volume resistivity also rises to 1.1×10 11 Ω·m and 6.2×10 9Ω·m. This result indicates that although the plasticized PVC transparent film with the antistatic plasticizer DBEEA has good antistatic performance, due to the poor water extraction resistance of the plasticizer, the water resistance of this film is poor and it cannot meet the requirements for long-term use in an environment where it comes into contact with water, needs to be cleaned with detergents, or has high humidity. To address the deficiencies of the above-mentioned plasticized PVC transparent film, rubber, especially nitrile rubber (NBR), can be selected to modify it. By utilizing the excellent plasticizer absorption capacity of NBR, the extraction mass of the film in water can be reduced. The literature Journal of Vinyl and Additive Technology discloses that 10 - 30 parts of powdered nitrile rubber (PNBR) are respectively selected to replace part of the PVC resin (the total amount of PVC / PNBR polymer still remains 100 parts) to improve the water extraction resistance of the antistatic plasticizer DBEEA. The research results show that: ① When the same 60 parts of the antistatic plasticizer DBEEA and an appropriate amount of stabilizer are added to all samples, compared with the blank sample without adding PNBR (PVC / PNBR = 100 / 0), adding 10 parts of PNBR (PVC / PNBR = 90 / 10) hardly improves the water extraction resistance of the plasticized PVC transparent film. After this film is soaked in distilled water for 8 weeks: the water extraction rate of the antistatic plasticizer DBEEA is still as high as 17.88%, the surface resistivity increases from 1.1×10 10 Ω to 8.4×10 11 Ω, and the volume resistivity also increases from 3.8×10 6 Ω·m to 4.2×10 8 Ω·m. ② Relatively speaking, adding 30 parts of PNBR (PVC / PNBR = 70 / 30) has a better effect on improving the water extraction resistance of the plasticized PVC transparent film. After this film is soaked in distilled water for 8 weeks: the water extraction rate of the antistatic plasticizer DBEEA drops to 12.88%, the surface resistivity increases from 1.3×10 10 Ω to 3.2×10 11 Ω, and the volume resistivity also increases from 2.9×10 6 Ω·m to 5.3×10 7Ω·m. ③ Adding 10 - 30 parts of PNBR to modify the plasticized PVC film containing the antistatic plasticizer DBEEA can, to a certain extent, improve the water extraction resistance performance of DBEEA and relatively slow down the decrease in the surface resistivity and volume resistivity of the plasticized PVC film during immersion in distilled water. However, the effect is not significant. ④ Adding PNBR to modify the plasticized PVC leads to a significant decrease in mechanical properties, especially the tensile strength, 100% modulus at specified elongation, and tear strength. Compared with the blank sample, after adding 30 parts of PNBR, the tensile strength of the plasticized PVC film decreased from 19.7 MPa to 9.3 MPa, the 100% modulus at specified elongation decreased from 6.6 MPa to 3.2 MPa, and the tear strength decreased from 48.5 kN / m to 25.5 kN / m, with a decrease of approximately 50%.

[0006] In order to further improve the decline in the antistatic effect of the antistatic plasticized PVC film caused by the water extraction of the antistatic plasticizer, the Chinese invention patent with the publication number CN119060471A and the patent name "An antistatic plasticized polyvinyl chloride transparent elastic film and its preparation method" discloses an antistatic plasticized PVC transparent elastic film. This functional transparent film selects plasticizers with dual functions of antistatic and plasticizing effects, such as DBEEA and dibutyl diglycol glutarate (DBEEG), uses block NBR or PNBR to inhibit the water extraction of the antistatic plasticizer, and at the same time, functional aids such as surface-modified high specific surface area porous silica and polyethylene wax are supplemented in the film formulation. By increasing the water contact angle on the film surface, the water extraction resistance performance of the antistatic plasticizer is further improved, and a plasticized PVC transparent film with high elasticity, high visible light transmittance, low surface resistivity, low volume resistivity, and stable antistatic effect during long-term use is prepared, making up for the advantage of only having a low surface resistivity in the current antistatic plasticized PVC transparent film products due to the addition of surfactant-type antistatic agents. Compared with the published literature, the water extraction resistance performance of the plasticized PVC film prepared with the publication number CN 119060471 is significantly improved. For example, after the films in Examples 1 - 8 were immersed in distilled water for 8 weeks: the mass change rate was less than -4%, and the lowest was only -1.01%; the surface resistivity was between 7.5×10 9 Ω to 9.9×10 9 Ω, and the volume resistivity was also between 4.0×10 6 Ω·m to 8.8×10 6Between Ω·m, it still maintains good antistatic performance. The test results of the mechanical properties of the plasticized PVC film in this example are as follows: the tensile strength is between 12.1 MPa and 17.1 MPa, the 100% modulus at specified elongation is between 3.2 MPa and 5.0 MPa, and the tear strength is between 27.5 kN / m and 41.2 kN / m; the test results of the film transparency are as follows: the visible light transmittance is between 86% and 92%, and the haze is between 7% and 9%. This is because the addition of non-self-reinforcing PNBR leads to a decrease in the mechanical strength of the film. At the same time, the addition of PNBR, silica, and polyethylene wax will also affect the transparency of the film to a certain extent. For special applications that require high strength, high visible light transmittance, and low haze, there is still room for further improvement in the antistatic plasticized PVC transparent film.

[0007] In the prior art, for the plasticized PVC film with transparent antistatic function, PVC resin prepared by suspension polymerization process is usually selected as the matrix material, and it is prepared by the following several methods: 1. For the plasticizer, a variety with a relatively low volume resistivity coefficient is selected, which is also often called antistatic plasticizer in the industry. That is, the antistatic and plasticizing dual functions of this kind of plasticizer are utilized to achieve the antistatic property of the film. In addition, due to the good compatibility between the plasticizer and PVC, the film also has a relatively high visible light transmittance. The advantage of this method is that no other antistatic additives need to be added, and the dual functions of the plasticizer are fully utilized to solve the plasticizing effect and antistatic effect of the film. The film has a relatively low surface resistivity coefficient and volume resistivity coefficient while also having good mechanical properties. The disadvantage is that the water extraction resistance performance of this kind of plasticizer is extremely poor, and the stability of the antistatic property is not good during long-term use. 2. Commonly used non-antistatic plasticizers in the industry are used, such as bis(2-ethylhexyl) terephthalate (DOTP), diisodecyl phthalate (DIDP), DEHP, DINP, DPHP, TOTM, PPA, etc., and antistatic agents are used simultaneously to prepare plasticized PVC antistatic transparent films. The advantage of this method is that there is no need to use relatively expensive antistatic plasticizers, and the used non-antistatic plasticizers have excellent water extraction resistance performance. The antistatic function is achieved by the antistatic agent added to the formula migrating to the surface to form a single-molecule conductive layer after the film is formed. The plasticized PVC film prepared by this method has good transparency, antistatic property and mechanical properties. It should be particularly noted that the film prepared by using the antistatic agent has a relatively low surface resistivity coefficient and a relatively high volume resistivity coefficient. The disadvantage is that the antistatic effect of the film increases with time in the initial stage of use, and the antistatic effect will weaken after long-term use. Especially, the antistatic effect of the film strongly depends on the environmental humidity. When the environmental humidity is low, the water absorption of the antistatic agent molecules is weak, and the antistatic effect of the film is not significant. 3. A relatively large amount of antistatic plasticizer and a relatively small amount of non-antistatic plasticizer are used together to prepare a plasticized PVC transparent film with antistatic function. The advantage of this method is that a small amount of non-antistatic plasticizer (accounting for 5-20% of the total amount of plasticizer) is used to appropriately reduce the cost and reduce the water extraction of the plasticizer. The film also has good visible light transmittance and relatively high mechanical strength. The disadvantage is that the addition of the non-antistatic plasticizer will reduce the surface resistivity coefficient and volume resistivity coefficient of the film to a certain extent, and the long-term water extraction resistance improvement effect of the film is not good. 4. When preparing the plasticized PVC antistatic transparent film using all or a relatively large amount of antistatic plasticizer as described above, in order to inhibit the decrease of the surface resistivity coefficient (volume resistivity coefficient) caused by the antistatic plasticizer when used in an environment with high humidity or long-term contact with water (such as water cleaning, outdoor rain washing, etc.), although using rubber-like modifiers in the formula has a certain effect, it also brings deficiencies such as a decrease in the transparency and mechanical strength of the film.

[0008] In recent years, with the continuous emergence of new technologies and new materials, ionic liquids, as a new type of antistatic agent, have gradually attracted the attention of researchers. Ionic liquids are liquid substances composed of free ions and have high electrical conductivity. Common cations among them are: imidazole type, pyridine type, quaternary ammonium ions, etc.; anions are: nitrate, halide ions, tetrafluoroborate, etc. In particular, polyionic liquids (ionic liquid polymers) formed by polymerizing ionic liquid units have received increasing attention, and their excellent electrical conductivity and migration resistance can be used in various antistatic polymer materials. The Chinese invention patent with the publication number CN115612175B and the patent name "High-transparency antistatic agent for PVC, its preparation method and application" discloses a high-transparency antistatic agent for PVC prepared by using compounds such as 50-80 parts by mass of coconut oil diethanolamide, 10-30 parts by mass of imidazole salt organic ionic liquid, and 10-30 parts by mass of quaternary ammonium perchlorate. Seven antistatic agents containing ionic liquids with different compositions and ratios were prepared by this technology, and antistatic plasticized PVC sheets were made according to the mass ratio of antistatic agent: PVC resin: calcium-zinc composite heat stabilizer: DOP plasticizer = 2:76:2:20. The test results of the surface resistivity of the plasticized PVC sheets are between 6.8×10 7 Ω and 5.5×10 8 Ω, showing a good antistatic effect. The antistatic material is used to prepare the wear-resistant layer of PVC floors. This patented technology has the following deficiencies or needs further improvement: a. The visible light of the seven plasticized PVC sheets prepared by this technology is only 56-70%, and the transparency is not good, which is not suitable for high-end occasions such as electronic appliances that require extremely high transparency. b. The plasticizer DOP used does not meet the requirements of the EU standard - RoHS directive and cannot be used in product fields such as electronic appliances. c. Although the cold resistance of the PVC prepared by this technology has not been tested, just using 20 parts by mass of the plasticizer DOP alone, it will lose its elasticity below 0°C. d. This published patent does not test the relationship between the surface resistance of the antistatic film and its placement conditions (such as time, temperature, humidity, or before and after water extraction, etc.), and it is unknown whether it is suitable for use in a high-humidity environment or whether the surface resistivity changes after water extraction.

[0009] The antistatic mechanism of ionic liquids mainly relies on their ionic conduction in the PVC resin matrix. By dissociating into anions and cations, a conductive path is formed in the matrix, enhancing the ionic conduction ability, and thus endowing the plasticized PVC with remarkable antistatic effects. Compared with traditional small-molecule surfactant antistatic agents, when ionic liquids, especially ionic liquid polymers with hydrophobic characteristics, are used as antistatic agents, they can make up for the deficiency that the surface resistivity of plasticized PVC films prepared with traditional small-molecule surfactant antistatic agents depends on the relative humidity in the air. The plasticized PVC prepared by the former also has the characteristics of good water wash resistance and long-lasting antistatic performance. However, when using ionic liquids alone as antistatic agents for plasticized PVC films, there are deficiencies such as a large amount of antistatic agent used, low visible light transmittance of the film, poor weather resistance and elasticity; there is also a lack of data on whether the antistatic effect can be stable during long-term use in a high-humidity environment or after extraction.

[0010] In summary, the commercial antistatic plasticized PVC transparent films in the prior art can meet the requirements of some occasions. However, for plasticized PVC transparent films that need to have excellent comprehensive properties such as low cost, high mechanical strength, high transparency, high elasticity, good cold resistance, water extraction resistance, and long-term stable antistatic effect to meet the high-quality functional film requirements of specific application occasions, the prior art cannot solve this well. Therefore, it is necessary to develop a multifunctional and high-quality antistatic plasticized PVC transparent elastic film and its preparation method to meet the new technical requirements of high-end electronics, electrical appliances, automobiles, construction, packaging and other industries in view of the deficiencies of the existing industry. Summary of the Invention

[0011] The object of the present invention is to solve the problems and deficiencies in the prior art and provide a high-strength antistatic plasticized polyvinyl chloride transparent film. This transparent film has excellent comprehensive properties, such as high mechanical strength, high elasticity, high visible light transmittance, low haze, good cold resistance, water extraction resistance, and long-term stable antistatic effect. Since the formula does not use high-cost raw materials such as PNBR, the formula is relatively simple and the preparation process is simplified, effectively reducing the manufacturing cost of the film. In particular, by using a small amount of ionic liquid polymers with dual antistatic and hydrophobic functions in combination with appropriate plasticizers DBEEA and DBEEG with dual plasticizing and antistatic functions, it can effectively inhibit the water extraction of antistatic plasticizers, making up for the deficiencies of the current antistatic plasticized PVC transparent film products in terms of the decrease in mechanical strength and transparency caused by the addition of rubber-based modifiers (NBR, PNBR, etc.), and can meet the special requirements of the high-end market.

[0012] The present invention also provides a preparation method for the high-strength antistatic plasticized polyvinyl chloride transparent film. The preparation method is simple, easy to implement and has a low cost.

[0013] The present invention is achieved through the following technical solutions:

[0014] The high-strength antistatic plasticized polyvinyl chloride transparent film of the present invention is made from the following raw materials in the following mass ratios: 100 parts of polyvinyl chloride resin, 30-45 parts of antistatic plasticizer, 10-25 parts of non-antistatic and non-cold-resistant plasticizer, 10-15 parts of cold-resistant plasticizer, 2.0-3.5 parts of ionic liquid polymer, 1.0-1.5 parts of liquid composite heat stabilizer, 0.5-1.5 parts of processing aid, and 0.3-0.5 parts of lubricant.

[0015] For the high-strength antistatic plasticized polyvinyl chloride transparent film of the present invention described above, a further technical solution is that the polyvinyl chloride resin is a linear high-polymerization-degree polyvinyl chloride resin synthesized by a suspension polymerization process and having a K value of 82±2.

[0016] For the high-strength antistatic plasticized polyvinyl chloride transparent film of the present invention described above, a further technical solution may also be that the antistatic plasticizer is one or a combination of dibutyl diglycol adipate and dibutyl diglycol glutarate; the non-antistatic and non-cold-resistant plasticizer is a phthalate plasticizer meeting the requirements of the EU RoHS directive; the cold-resistant plasticizer is an aliphatic dibasic acid ester compound meeting the requirements of the EU RoHS directive. A further technical solution is that the phthalate plasticizer is preferably one or a combination of diisononyl phthalate, diisodecyl phthalate, or di(2-propylheptyl) phthalate; the aliphatic dibasic acid ester compound is preferably one or a combination of dioctyl azelate, dioctyl sebacate, or dioctyl adipate.

[0017] For the high-strength antistatic plasticized polyvinyl chloride transparent film of the present invention described above, a further technical solution may also be that the ionic liquid polymer is a non-humidity-dependent alkyl salt antistatic agent. The non-humidity-dependent alkyl salt antistatic agent is a mixture of quaternary ammonium salt conductive ionic liquid polymer and fatty alcohol ether phosphate salt. The one used in this application is the non-humidity-dependent alkyl salt antistatic agent with the brand number H01-14 produced by Sichuan Hongyu Bo Technology Co., Ltd.

[0018] For the high-strength antistatic plasticized polyvinyl chloride transparent film of the present invention described above, a further technical solution may also be that the liquid heat stabilizer is a PVC resin heat stabilizer meeting the requirements of the EU RoHS directive, and its main components are a composition of organic salts such as metal calcium, barium, and zinc and functional aids such as solvent oil, and it belongs to a PVC resin heat stabilizer without toxic heavy metals such as lead and cadmium; the processing aid is an acrylate resin synthesized by a solution method; such as varieties like PA-20 of Nippon Zeon Co., Ltd.

[0019] The above-mentioned high-strength antistatic plasticized polyvinyl chloride transparent film of the present invention may further have a technical solution that the lubricant is a low-acid-value high-viscosity liquid paraffin oil with a relative density of 0.845 to 0.890 g / cm 3 , a kinematic viscosity of 15 to 25 mm 2 / s at 100 °C, an acid value ≤ 0.01 mgKOH / g, an initial boiling point above 350 °C, and an average relative molecular mass ≥ 600.

[0020] The preparation method of the above-mentioned high-strength antistatic plasticized polyvinyl chloride transparent film of the present invention includes the following steps:

[0021] Pre-mixing of plasticizer and ionic liquid polymer: The antistatic plasticizer, non-antistatic non-freezing plasticizer, and freezing plasticizer are automatically metered according to the formula ratio and added into a reaction kettle with stirring and jacket water heating. After controlling the stirring speed at 50 - 60 rpm and the stirring time at 5 - 10 min, the metered ionic liquid polymer is added, and stirring continues for 15 - 20 min until the temperature of the mixture reaches 65 ± 5 °C, then it is kept warm to obtain the plasticizer / ionic liquid mixture for later use; (In this step, the three plasticizers are pre-mixed evenly and then added into the PVC resin, which can make each plasticizer evenly dispersed in the resin to better play their respective functions. Considering the small amount of the ionic liquid polymer, it is not easy to be unevenly mixed when directly added to the PVC resin, which will affect its use effect. Pre-dispersing it in the three plasticizers is beneficial for the ionic liquid polymer to be better dispersed evenly in the matrix resin with the help of the plasticizer. At the same time, heating the plasticizer / ionic liquid polymer mixture is convenient for the plasticizer and ionic liquid polymer to be quickly absorbed by PVC during the high-speed mixing process later)

[0022] High-speed mixing of plasticized PVC powder: Put polyvinyl chloride resin and liquid composite stabilizer into a high-speed mixer of the heat-mixing type. First, start the low-speed mixing mode, with the rotation speed controlled at 300 - 400 rpm and the mixing time at 1 - 2 min; add half of the pre-mixed and pre-heated plasticizer / ionic liquid mixture and switch to the high-speed mixing mode to mix evenly, with the rotation speed controlled at 650 - 900 rpm and the mixing time at 2 - 3 min; when the temperature rises to 50 - 60 °C, continue to add the remaining plasticizer / ionic liquid mixture; when all the plasticizers are completely absorbed by the resin, add the liquid paraffin oil lubricant and continue to mix evenly until the material temperature rises to 80 - 90 °C. At this time, when the material is in a dry state, stop stirring; finally, discharge the evenly mixed material into a low-speed mixer with jacket circulating water cooling, control the rotation speed at 60 - 100 rpm, and continue to mix until it is discharged to the storage bin at 40 ± 5 °C to obtain the mixed powder;

[0023] Plasticization and Filtration of Plasticized PVC: The mixed powder is added to a twin-screw planetary extruder for plasticization and mixing. The barrel temperature is controlled at 160 - 180°C, and the powder is initially plasticized into a spiral chain-like material, which is then conveyed by a conveyor belt to a two-roll mill for further plasticization. The temperature of the two-roll mill is controlled at 140 - 170°C. Since the plasticizer content in the film formulation is relatively high, the material in the two-roll mill is flipped every 5 - 10 minutes to ensure uniform plasticization. The uniformly plasticized material from the two-roll mill further enters a rubber filtering machine to filter impurities. The barrel temperature of the rubber filtering machine is controlled at 160 - 180°C, and the filter screen at the discharge die head is a three-layer combined filter screen, with the filter screen specification being a three-layer stainless steel mesh sheet with a mesh count of 20 / 150 / 20 stacked together.

[0024] Film Calendering and Cooling: The material filtered by the rubber filtering machine is conveyed along a conveyor belt to a calender main machine, and a high-strength antistatic plasticized polyvinyl chloride transparent film is obtained through a four-roll calendering, constant temperature water bath cooling, roll cooling, winding, and storage cooling process.

[0025] For the preparation method of the above-mentioned high-strength antistatic plasticized polyvinyl chloride transparent film of the present invention, a further technical solution is that in the film calendering and cooling step, the process parameters of the four-roll calendering are as follows: the temperature of the 1# roll is controlled at 170 - 180°C, and the speed is 5 - 15 m / min; the temperature of the 2# roll is controlled at 175 - 185°C, and the speed is 10 - 30 m / min; the temperature of the 3# roll is controlled at 175 - 185°C, and the speed is 20 - 40 m / min; the temperature of the 4# roll is controlled at 140 - 160°C, and the speed is 25 - 40 m / min. The process parameters of the constant temperature water bath cooling are as follows: the high-temperature film peeled off from the 4# roll of the calender immediately enters a constant temperature water bath with a length of 1.5 - 2.0 meters and a water temperature of 34 - 36°C for rapid cooling; the film passes through the bottom of the constant temperature cooling water bath, and the cooling water bath is designed with a surface water outlet to remove oil stains and a clean water continuous replenishment control device. The process parameters of the roll cooling are as follows: the film rapidly cooled by the constant temperature water bath is drawn out and directly enters a cooling roll section composed of multiple rolls through an embossed smooth roll for further cooling. In view of the special requirement of high transparency of the film after passing through water, the cooling roll section needs to perform heat preservation cooling treatment on the film, including controlling the speed of the cooling roll at 40 - 50 m / min, passing hot water with a water temperature of 60 - 80°C inside the cooling roll section for heat preservation, and wrapping the cooling roll group with gauze. The process parameters of the winding and storage cooling are as follows: the film is sent to the winding section after being heat preservation cooled by the cooling roll group and is wound under pressure by a winder, with a winding speed of 45 - 55 m / min; the internal temperature of the just-wound film is between 50 - 60°C. To ensure the high transparency of the film, it needs to be promptly transferred to a cold storage at 15 - 20°C for storage until it is cooled to room temperature.

[0026] In this invention, the surface resistivity and volume resistivity of the air are tested as follows: in accordance with the standard GB / T 8815-2008, the test temperature is 23±2°C and the relative humidity is 60%. The volume and surface resistances of the plasticized PVC film placed in the air are tested by using a ZC 36 high-resistance meter (Shanghai No. 6 Electronic Instrument Factory). Resistivity is an important standard for measuring the electrical conductivity of materials. The following is the calculation formula for resistivity:

[0027]

[0028] where ρ v and ρ s are the volume resistivity and surface resistivity respectively; R v and R s are the volume resistance and surface resistance respectively; A e refers to the area of the bottom electrode; t refers to the thickness of the plasticized PVC film; d 1 and d 2 are the diameters of the measuring electrode and the protection electrode respectively.

[0029] The surface resistivity and volume resistivity after water extraction are tested as follows: in accordance with the standard GB / T 8815-2008, the test temperature is 23±2°C and the relative humidity is 60%. The volume and surface resistances of the plasticized PVC film after soaking are tested by using a ZC 36 high-resistance meter (Shanghai No. 6 Electronic Instrument Factory). In addition, the moisture on the film surface needs to be wiped dry before the test, and other test methods are the same as above.

[0030] The water extraction resistance performance and weight loss rate are tested as follows: an electronic balance is used to weigh the film before and after soaking, the soaking temperature is 23±2°C, and the weight loss rate of the film after each soaking is calculated at the same time. The following is the formula for the weight loss rate of the film:

[0031]

[0032] where ΔW is the weight loss rate; W 0 and W 1 are the masses of the film before and after soaking respectively

[0033] The light transmittance and haze are tested in accordance with the ASTM D 1003 standard. The size of the film is 25mm×25mm×0.25mm. The light transmittance and haze of the film are measured by a WGW photoelectric haze meter of Shanghai Yidian Physical Optics Instrument Co., Ltd. The haze is expressed as the percentage of the scattered light flux to the light flux passing through the material, and the light transmittance is the percentage of the light flux passing through the sample to its incident light flux. Generally speaking, the higher the light transmittance and the lower the haze, the better the optical performance of the film.

[0034] Tensile permanent deformation test: According to the standard ISO 527–3:1995, the tensile permanent deformation test of the film was carried out using a universal testing machine (SANS Testing Machine Co., Ltd.). The test specimens were required to be placed at 23±2°C for 48 h before the test. The tensile speed was 50 mm / min; the samples were dumbbell-shaped specimens with a thickness of 1 mm, and the average value was taken after measuring each sample three times.

[0035] Compression permanent deformation test: It was carried out according to the standard GB / T 7759.1-2015. The samples were cylindrical with a diameter of 29.5 mm and a height of 12.5 mm. Test conditions: 70°C×22 h, compression ratio 25±2%.

[0036] Glass transition temperature test: The relationship between the loss tangent value and temperature of different plasticized PVC samples was tested by dynamic mechanical thermal analysis using a rotational rheometer (MCR302, Anton, Austria). The peak temperature was defined as the glass transition temperature of the plasticized PVC film. The size of the sample was 25 mm×6 mm×1 mm. The experiment was carried out in torsion mode, the test frequency was 1 Hz, the heating rate was 3°C / min, and the test temperature range was -80°C - 100°C.

[0037] The present invention has the following beneficial effects compared with the prior art:

[0038] The present invention overcomes the following main deficiencies existing in the prior art when preparing antistatic plasticized PVC transparent films. Targeted material selection, formulation, and process design are carried out, and creative improvements are made. The specific effects are as follows: ① Only selecting a linear high-polymerization-degree PVC resin synthesized by a single suspension polymerization method with a K value of 82 ± 2 is based on the consideration that the film prepared after adding a plasticizer to this resin has good mechanical properties such as tensile strength, tear strength, and elongation at break, and at the same time has good elasticity. In addition, the uniformity of the single resin system is good, which can ensure the uniformity of the refractive index of the matrix resin, and is more conducive to preparing a plasticized PVC transparent film with high visible light transmittance and low haze. ② Although the film prepared with a linear high-polymerization-degree PVC resin with a K value of 82 ± 2 has many advantages, the entanglement formed by the high molecular weight of the PVC resin will affect the calendering processing performance of the film. The present invention innovatively introduces acrylic resin processing aids commonly used in rigid PVC plastic products into the plasticized PVC film formulation system, and makes full use of the action mechanisms of acrylic resin processing aids such as promoting the melting of PVC resin, improving the melt rheological properties, and imparting lubrication functions, and well solves the problem of difficult calendering processing caused by selecting a linear high-polymerization-degree PVC resin with a K value of 82 ± 2. ③ Since there are many varieties and different properties of commercial acrylate resin processing aids, especially the residual emulsifiers contained in the acrylate resin processing aids synthesized by the emulsion method will affect the transparency of the film. Therefore, selecting acrylate resin processing aids synthesized by the solution method, such as PA-20 and other varieties of Nippon Zeon Chemical Co., Ltd., can maintain the high transparency of the film while improving the processing performance of high-polymerization-degree PVC resin. ④ Since only one linear high-polymerization-degree PVC resin is selected as the main polymer material, the decrease in the mechanical strength of the film caused by using non-self-reinforcing rubbers (such as NBR, PNBR, etc.) is avoided. Although rubbers synthesized by the solution method can be blended with PVC to prepare transparent films, compared with the films prepared by only using one suspension method PVC resin, the transparency of the rubber-modified plasticized PVC films is still slightly worse, and the indicators characterizing transparency such as haze are also slightly worse. ⑤ The present invention uses three different plasticizers with different functions, namely antistatic plasticizers, cold-resistant plasticizers, and non-antistatic and non-cold-resistant plasticizers, in combination, which can play the functions of various plasticizers and make the prepared functional film have excellent comprehensive properties. For example: a. Selecting a relatively high content (30 - 45 parts) of antistatic plasticizers, such as one or a combination of DBEEA and DBEEG, in the plasticized PVC film formulation is based on the fact that this type of plasticizer has dual functions of antistatic and plasticizing. However, when the dosage is small, the antistatic effect of the prepared film is not good, and when the dosage is large, the water extraction resistance of the prepared film is not good, and at the same time, the cost of the film formulation increases.b. Select an appropriate amount (10 - 25 parts) of non-antistatic and non-low-temperature-resistant plasticizers, such as one or a combination of DINP, DIDP, and DPHP. This is based on the advantages of this type of plasticizer, including good plasticizing effect, water extraction resistance, and relatively low cost. However, its disadvantage is that it has good insulation performance and no antistatic effect. c. Select a small amount (10 - 15) of low-temperature-resistant plasticizers, such as one or a combination of dioctyl azelate (DOZ), dioctyl sebacate (DOS), and dioctyl adipate (DOA). This is because this type of plasticizer has excellent low-temperature resistance, good plasticizing effect, and water extraction resistance. The plasticized PVC film prepared has characteristics such as good low-temperature flexibility (elasticity) and excellent cold resistance. It should be particularly noted that when the amount of this type of plasticizer used is small, the modification effect on the low-temperature flexibility of the film is not significant. At the same time, the disadvantage is that the price of the plasticizer is relatively high. d. The combination of three different types of plasticizers and their dosages solves the deficiencies of using a single plasticizer, making the prepared plasticized PVC film have a series of advantages such as antistatic, water extraction resistance, and good low-temperature flexibility. In particular, the glass transition temperature of the film is below -10°C, with excellent low-temperature resistance, and at the same time, it also has the advantage of a relatively low cost of the film formulation. ⑥ Ionic liquids, especially ionic liquid polymers formed by polymerizing ionic liquid units, are added to PVC resin. Their excellent conductivity enables the plasticized PVC to have a significant antistatic effect. The ionic liquid polymer used in this invention is a non-humidity-dependent alkyl salt antistatic agent, and its main component is a mixture of quaternary ammonium salt-based conductive ionic liquid polymer and fatty alcohol ether phosphate salt, such as the ionic conductive antistatic agent with the brand number H01-14 produced by Sichuan Hongyu Bo Technology Co., Ltd. Compared with traditional small-molecule surfactant-based antistatic agents, when the ionic liquid polymer with hydrophobic characteristics is used as an antistatic agent, it makes up for the deficiency that the surface resistivity of the plasticized PVC film prepared with traditional small-molecule surfactant-based antistatic agents depends on the relative humidity in the air. The prepared plasticized PVC also has characteristics such as water wash resistance and good antistatic persistence. ⑦ Although the plasticized PVC film prepared by using the ionic liquid polymer with hydrophobic characteristics as an antistatic agent has advantages such as a low surface resistance coefficient and a good continuous antistatic effect, the effect is not good when the usage amount is low. The research results show that when the plasticizer in the plasticized PVC formulation is a non-antistatic plasticizer (DINP, DIDP, DPHP), the surface resistance coefficient of the film can only be reduced to 1.0×10 when the usage amount of the ionic liquid polymer is up to 5 parts and above (relative to 100 parts of PVC resin). 11Ω, meeting the basic antistatic requirements. ⑧The present invention patent uniquely uses a relatively large amount of antistatic plasticizer (30 - 45 parts of antistatic plasticizer relative to 100 parts of PVC resin) and a relatively small amount of (only 2.0 - 3.5 parts of ionic liquid polymer antistatic agent relative to 100 parts of PVC resin) ionic liquid polymer antistatic agent. The synergistic effect produced by their combination can significantly reduce the surface resistivity and volume resistivity of the plasticized PVC film. Compared with the system using only liquid polymer antistatic agent and non-antistatic plasticizer in combination, the former can reduce the surface resistivity and volume resistivity of the plasticized PVC film to 1.2×10 9 ~7.8×10 9 Ω and 1.6×10 6 ~5.2×10 6 Ω·m (Examples 1 - 10), and the antistatic effect is remarkable. ⑨We unexpectedly found in the research that the ionic liquid used in the present invention, as a humidity-independent alkyl salt antistatic agent, also has the effect of inhibiting the water extraction resistance of antistatic plasticizers DBEEA and DBEEG. For example, the results in Examples 1 - 10 show that: the combination of hydrophobic ionic liquid polymer, non-antistatic and non-cold-resistant plasticizers (DINP, DIDP, DPHP) and cold-resistant plasticizers (DOZ, DOS, DOA) almost completely inhibits the water extractability of antistatic plasticizers. After the plasticized PVC film is soaked in distilled water for 4 - 16 weeks, the mass change rate is less than ±1%, and the long-term stability of the antistatic performance is maintained. ⑩The present invention patent selects 0.3 - 0.5 parts of the kinematic viscosity at 100℃ of 15 - 25mm 2Low acid value and high viscosity liquid paraffin oil with a kinematic viscosity of 100 mm² / s, acid value ≤ 0.01 mgKOH / g, initial boiling point above 350 °C, and average relative molecular mass ≥ 600 as a lubricant has the following advantages: a. Due to the non-polar characteristics of liquid paraffin oil, it can be used as an external lubricant in the PVC resin formulation system, and can improve the problem of decreased film processing fluidity caused by the use of high-polymerization-degree PVC resin together with acrylate processing aids. b. Selecting high-viscosity liquid paraffin oil can prevent it from being easily volatilized during the high-temperature calendering process around 180 °C, so as to ensure that the liquid paraffin oil can still remain on the surface of the film as an external lubricant and continue to play its due function in the later stage of film processing. c. Commercial PVC resins undergo a degradation reaction of dehydrochlorination during processing, and acidic additives in the formulation will further accelerate this dehydrochlorination reaction. When using low acid value and high viscosity liquid paraffin oil as an external lubricant, it can effectively avoid or reduce the promotion of the degradation of PVC resin by acidic substances in the additives, and ensure the appearance quality and high visible light transmittance of high-quality films. ⑾ When the three plasticizers are premixed evenly and then added to the PVC resin, each plasticizer can be evenly dispersed in the resin to better play its respective functions. Considering that the dosage of ionic liquid polymer is small, it is not easy to be unevenly mixed when directly added to the PVC resin, which will affect its use effect. Premixing it in the three plasticizers is beneficial for the ionic liquid polymer to be better dispersed evenly in the matrix resin with the help of the plasticizer. At the same time, heating the mixture of plasticizer / ionic liquid polymer facilitates the rapid absorption of the plasticizer and ionic liquid polymer by PVC during the high-speed mixing process in the later stage. ⑿ During the film calendering production, an innovative combination process of multiple low-temperature and rapid cooling, such as constant temperature water bath cooling, roller cooling, winding and storage cooling, is adopted to quickly freeze each additive in the film formulation into tiny droplets in the PVC matrix, avoiding the deficiencies of decreased visible light transmittance and increased haze of the film caused by the process of small droplets aggregating into larger droplets and then slowly cooling at high temperature. The plasticized PVC functional film produced by the method of the present invention has better transparency (≥ 95.0%) and lower haze (≤ 5.5%).

[0039] In summary, in the high-strength permanent antistatic plasticized PVC transparent film of the present invention, the polymer matrix material is a linear high-polymerization-degree PVC resin produced by a suspension polymerization process with a K value of 82 ± 2; the plasticizer uses antistatic plasticizers DBEEA and DBEEG as the main plasticizers, supplemented by appropriate amounts of non-antistatic and non-cold-resistant plasticizers such as DINP, DIDP, and DPHP that comply with the EU RoHS directive, and a small amount of cold-resistant plasticizers such as DOZ, DOS, and DOA; the synergistic effect of non-humidity-dependent alkyl salt antistatic agents and antistatic plasticizers is used to reduce the resistivity of the PVC resin; other functional aids are selected, as well as the pre-mixing of special plasticizers and ionic liquid polymers and special low-temperature rapid cooling in the calendering process, etc. A plasticized PVC transparent film with a series of advantages such as high strength, high elasticity, low surface resistivity and volume resistivity, high visible light transmittance and low haze is prepared. The film prepared by the present invention also has the characteristic of maintaining long-term stable antistatic performance in air, especially in water or high-humidity environments. Examples 1 to 10 show that after the film is soaked in water for 16 weeks, the water extraction rate is lower than ±1%, and at the same time, the surface resistivity and volume resistivity are 1.5×10 9 Ω to 8.1×10 9 Ω, 1.2×10 6 Ω·m to 5.1×10 6 Ω·m, still maintaining excellent antistatic performance, superior to the reported literature. The plasticized PVC functional film of the present invention enriches the demand for high-end multifunctional films with high strength, high transparency, and long-term stable antistatic performance in the fields of electronics and electrical appliances, automobiles, and buildings. Detailed implementation manners

[0040] The present invention will be described below through specific examples, but the present invention is not limited to these examples only.

[0041] In the examples: The ionic liquid polymer is an ion-conductive antistatic agent with the brand H01-14 produced by Sichuan Hongyu Bo Technology Co., Ltd.; the processing aid is a PA-20 acrylate processing aid from Nippon Zeon Co., Ltd.; the lubricant has a relative density of 0.845 to 0.890 g / cm 3 and a kinematic viscosity of 15 to 25 mm 2 / s at 100 °C, an acid value of ≤0.01 mg KOH / g, an initial boiling point of above 350 °C, and an average relative molecular mass of ≥600 of a low-acid-value high-viscosity liquid paraffin oil.

[0042] Example 1

[0043] Raw material formula (mass ratio, parts): PVC resin (K value = 80) 100, antistatic plasticizer DBEEA 30, antistatic plasticizer DBEEG 15, non-antistatic and non-cold-resistant plasticizer DINP 10, cold-resistant plasticizer DOA 10, ionic liquid polymer (H01-14) 2.0, liquid composite stabilizer 1.5, acrylate processing aid (PA-20) 0.5, lubricant 0.3. The preparation process is as follows:

[0044] Pre-mixing of plasticizer and ionic liquid polymer: Automatically measure the antistatic plasticizers DBEEA and DBEEG, the non-antistatic and non-cold-resistant plasticizer DINP, and the cold-resistant plasticizer DOA according to the formula ratio and add them to a 3000L reaction kettle with stirring and jacket water heating. Control the stirring speed at 50 rpm and the stirring time at 10 min, then add the measured ionic liquid polymer. Continue for 15 min until the temperature of the mixture reaches 60 °C and keep it warm for later use.

[0045] High-speed mixing of plasticized PVC powder: Put polyvinyl chloride resin and liquid composite stabilizer into a 500L hot mixing type high-speed mixer. First, start the low-speed mixing mode with a rotation speed controlled at 300 rpm and a mixing time of 2 min; after adding half of the pre-mixed and pre-heated plasticizer / ionic liquid mixture, transfer to the high-speed mixing mode and mix evenly, control the rotation speed at 650 rpm and the mixing time at 3 min; when the temperature rises to 50 °C, continue to add the remaining plasticizer / ionic liquid mixture; when all the plasticizers are completely absorbed by the resin, add liquid paraffin oil lubricant and continue to mix evenly until the material temperature rises to 80 °C. At this time, when the material is in a dry state, stop stirring; finally, discharge the evenly mixed material into an 800L low-speed mixer with jacket circulating water cooling, control the rotation speed at 60 rpm, and continue to mix until it is discharged to the storage bin at 40 °C.

[0046] Plasticization and filtration of plasticized PVC: Add the mixed powder to a twin-screw planetary extruder for plasticization and mixing. Control the barrel temperature at 160 - 180 °C to initially plasticize the powder into a helical chain-like material, and then convey it to a two-roll mill by a conveyor belt for further plasticization. Control the temperature of the two-roll mill at 140 - 170 °C. Since the plasticizer content in the film formula is relatively high, the two-roll mill flips the material every 5 - 10 min to ensure uniform plasticization. The material uniformly plasticized by the two-roll mill further enters a filter to filter out impurities. Control the barrel temperature of the filter at 160 - 180 °C, and the filter screen at the die head is a three-layer combined filter screen with a filter screen specification of three-layer stainless steel mesh sheets with mesh numbers 20 / 150 / 20 laminated.

[0047] Film calendering and cooling: The material filtered by the rubber filter machine is conveyed along the conveyor belt to the calendering main machine, and through processes such as four-roll calendering into film, constant-temperature water tank cooling, roller cooling, winding and storage cooling, a high-strength antistatic plasticized polyvinyl chloride transparent film is obtained.

[0048] 1. Process parameters for four-roll calendering of the film: The temperature of the 1# roller is controlled at 170 °C and the speed is 5 m / min, the temperature of the 2# roller is controlled at 175 °C and the speed is 10 m / min, the temperature of the 3# roller is controlled at 175 °C and the speed is 20 m / min, and the temperature of the 4# roller is controlled at 140 °C and the speed is 25 m / min.

[0049] 2. Process parameters for water tank cooling of the film: The high-temperature film peeled off from the 4# roller of the calender immediately enters a constant-temperature water tank with a length of 2.0 meters and a water temperature of 34 °C for rapid cooling. The film passes through the bottom of the constant-temperature cooling water tank, and the cooling water tank is designed with control devices such as surface water discharge to remove oil stains and continuous replenishment of clean water.

[0050] 3. Process parameters for roller cooling: The film rapidly cooled in the constant-temperature water tank is drawn out and directly enters the cooling roller section composed of multiple rollers through the embossing and smooth rollers for further cooling. In view of the special requirement of high transparency of the film after passing through water, the cooling roller section needs to carry out heat preservation and cooling treatment on the film, including controlling the speed of the cooling roller at 40 m / min, passing hot water with a water temperature of 60 °C inside the cooling roller section for heat preservation, and wrapping the cooling roller group with gauze, etc.

[0051] 4. Process parameters for winding and storage cooling: The film is sent to the winding section after heat preservation and cooling by the cooling roller group, and is wound under pressure by the winder, with a winding speed of 45 m / min. Since the internal temperature of the just-wound film is between 50 °C, in order to ensure the high transparency of the film, it needs to be transferred to a cold storage at 20 °C for storage in time until it is cooled to room temperature. After testing, its performance is shown in Table 1 and Table 2.

[0052] Example 2

[0053] Raw material formula (mass ratio, parts): PVC resin (K value = 82) 100, antistatic plasticizer DBEEG 42, non-antistatic and non-cold-resistant plasticizer DPHP 10, cold-resistant plasticizer DOZ 12, ionic liquid polymer (H01-14) 2.6, liquid composite stabilizer 1.0, acrylate processing aid (PA-20) 1.0, lubricant 0.4. The preparation process is as follows:

[0054] Pre-mixing of plasticizer and ionic liquid polymer: The antistatic plasticizer DBEEG, non-antistatic and non-freezing plasticizer DPHP, and freezing plasticizer DOZ were automatically metered according to the formula ratio and added into a 3000L reaction kettle with stirring and jacket water heating. After controlling the stirring speed at 60 rpm and the stirring time for 5 min, the metered ionic liquid polymer was added. Then, it continued for 20 min until the temperature of the mixture reached 65 °C and was kept warm for standby.

[0055] High-speed mixing of plasticized PVC powder: Polyvinyl chloride resin and liquid composite stabilizer were put into a 500L hot-mixing type high-speed mixer. First, the low-speed mixing mode was started, with the rotation speed controlled at 400 rpm and the mixing time for 1 min. After adding half of the pre-mixed and pre-heated plasticizer / ionic liquid mixture, it was transferred to the high-speed mixing mode and mixed evenly, with the rotation speed controlled at 900 rpm and the mixing time for 2 min. When the temperature rose to 60 °C, the remaining plasticizer / ionic liquid mixture was continuously added. When all the plasticizer was completely absorbed by the resin, liquid paraffin oil lubricant was added and mixed evenly until the material temperature rose to 90 °C. At this time, when the material was in a dry state, the stirring was stopped. Finally, the evenly mixed material was discharged into an 800L low-speed mixer with jacket circulating water cooling, with the rotation speed controlled at 100 rpm, and continued to be mixed until it was discharged to the storage bin at 45 °C.

[0056] Plasticization and filtration of plasticized PVC: The mixed powder was added to a twin-screw planetary extruder for plasticization and mixing. The barrel temperature was controlled at 160 - 180 °C, and the powder was initially plasticized into a spiral chain-like material, and then conveyed by a conveyor belt to a two-roll mill for further plasticization. The temperature of the two-roll mill was controlled at 140 - 170 °C. Since the plasticizer content in the film formula was relatively high, the material on the two-roll mill was turned over every 5 - 10 min to ensure uniform plasticization. The material plasticized evenly on the two-roll mill further entered a filter to filter impurities. The barrel temperature of the filter was controlled at 160 - 180 °C, and the filter screen at the discharge die head was a three-layer combined filter screen, with the filter screen specification being a three-layer stainless steel mesh sheet with a mesh number of 20 / 150 / 20 laminated together.

[0057] Film calendering forming and cooling: The material filtered by the rubber filter was conveyed along the conveyor belt to the calender main machine, and a high-strength antistatic plasticized polyvinyl chloride transparent film was obtained through processes such as four-roll calendering into a film, constant temperature water bath cooling, roll cooling, winding, and storage cooling.

[0058] 1. Process parameters for film four-roll calendering forming: The temperature of the 1# roll is controlled at 175 °C and the speed is 10 m / min, the temperature of the 2# roll is controlled at 180 °C and the speed is 20 m / min, the temperature of the 3# roll is controlled at 180 °C and the speed is 30 m / min, and the temperature of the 4# roll is controlled at 150 °C and the speed is 30 m / min.

[0059] 2. Film sink cooling process parameters: The high-temperature film peeled off from the 4# roller of the calender immediately enters a constant-temperature water tank with a length of 2.0 meters and a water temperature of 35°C for rapid cooling. The film passes through the bottom of the constant-temperature cooling water tank, and the cooling water tank is designed with control devices such as surface water discharge to remove oil and impurities and continuous makeup of clean water.

[0060] 3. Roller cooling process parameters: The film quenched in the constant-temperature water tank is drawn out and directly enters the cooling roller section composed of multiple rollers through the embossed smooth roller for further cooling. In view of the special requirement of high transparency of the film after passing through water, the cooling roller section needs to carry out heat preservation and cooling treatment on the film, including controlling the speed of the cooling roller at 45 m / min, passing hot water with a temperature of 70°C inside the cooling roller section for heat preservation, and wrapping the cooling roller group with gauze.

[0061] 4. Coiling and storage cooling process parameters: The film is sent to the coiling section after heat preservation and cooling by the cooling roller group, and is coiled under pressure by the coiling machine at a coiling speed of 50 m / min. Since the internal temperature of the just-coiled film is between 5°C, in order to ensure the high transparency of the film, it needs to be transferred to a cold storage at 20°C in time for storage until it is cooled to room temperature. Its performance is shown in Table 1 and Table 2 after testing.

[0062] Example 3

[0063] Raw material formula (mass ratio, parts): PVC resin (K value = 84) 100, antistatic plasticizer DBEEG 38, non-antistatic non-cold-resistant plasticizer DIDP 12, cold-resistant plasticizer DOA 12, ionic liquid polymer (H01-14) 2.1, liquid composite stabilizer 1.2, acrylate processing aid (PA-20) 1.5, lubricant 0.5. The preparation process is as follows:

[0064] Pre-mixing of plasticizer and ionic liquid polymer: The antistatic plasticizer DBEEG, non-antistatic non-cold-resistant plasticizer DIDP and cold-resistant plasticizer DOA are automatically metered according to the formula ratio and added into a 3000L reaction kettle with stirring and jacket water heating. After controlling the stirring speed at 50 rpm and the stirring time at 10 min, the metered ionic liquid polymer is added, and stirring continues for 15 min until the temperature of the mixture reaches 65°C, then it is kept warm for standby.

[0065] High-speed mixing of plasticized PVC powder: Polyvinyl chloride resin and liquid composite stabilizer are put into a 500L hot-mixing high-speed mixer. First, start the low-speed mixing mode with a rotation speed controlled at 300 rpm and a mixing time of 2 minutes. After adding half of the pre-mixed and pre-heated plasticizer / ionic liquid mixture, switch to the high-speed mixing mode and mix evenly, with the rotation speed controlled at 900 rpm and a mixing time of 2 minutes. When the temperature rises to 55°C, continue to add the remaining plasticizer / ionic liquid mixture. When all the plasticizer is completely absorbed by the resin, add liquid paraffin oil lubricant and continue to mix evenly until the material temperature rises to 85°C. At this time, when the material is in a dry state, stop stirring. Finally, discharge the evenly mixed material into an 800L low-speed mixer with jacketed circulating water cooling, control the rotation speed at 60 rpm, and continue to mix until the temperature reaches 35°C and then discharge it into the storage bin.

[0066] Plasticization and filtration of plasticized PVC: The mixed powder is added to a twin-screw planetary extruder for plasticization and mixing. The barrel temperature is controlled at 160 - 180°C, and the powder is initially plasticized into a spiral chain-like material, and then conveyed by a conveyor belt to a two-roll mill for further plasticization. The temperature of the two-roll mill is controlled at 140 - 170°C. Since the plasticizer content in the film formula is relatively high, the material on the two-roll mill is flipped every 5 - 10 minutes to ensure uniform plasticization. The uniformly plasticized material on the two-roll mill further enters a filter to filter out impurities. The barrel temperature of the filter is controlled at 160 - 180°C, and the filter screen at the discharge die head is a three-layer combined filter screen, with the filter screen specification being a three-layer stainless steel mesh sheet with a mesh number of 20 / 150 / 20 laminated together.

[0067] The filter screen of the die head is a three-layer combined filter screen, with the filter screen specification being a three-layer stainless steel mesh sheet with a mesh number of 20 / 150 / 20 laminated together.

[0068] Film calendering and cooling: The material filtered by the rubber filter is conveyed along the conveyor belt to the calender main machine, and through processes such as four-roll calendering into a film, constant-temperature water bath cooling, roll cooling, winding and storage cooling, a high-strength antistatic plasticized polyvinyl chloride transparent film is obtained.

[0069] 1. Process parameters for the four-roll calendering of the film: The temperature of the 1# roll is controlled at 180°C and the speed is 15 m / min, the temperature of the 2# roll is controlled at 185°C and the speed is 30 m / min, the temperature of the 3# roll is controlled at 185°C and the speed is 40 m / min, and the temperature of the 4# roll is controlled at 160°C and the speed is 40 m / min.

[0070] 2. Process parameters for the water bath cooling of the film: The high-temperature film peeled off from the 4# roll of the calender immediately enters a constant-temperature water bath with a length of 12.0 meters and a water temperature of 36°C for rapid cooling. The film passes through the bottom of the constant-temperature cooling water bath, and the cooling water bath is designed with control devices such as surface water discharge to remove oil and continuous make-up of clean water.

[0071] 3. Roller cooling process parameters: The film quenched in the constant temperature water bath is taken out and directly enters the cooling roller section composed of multiple rollers through the embossing smooth roller for further cooling. In view of the special requirement of high transparency of the film after passing through water, the cooling roller section needs to carry out heat preservation cooling treatment on the film, including controlling the speed of the cooling roller at 50 m / min, passing hot water at 80 °C through the cooling roller section for heat preservation, and wrapping the cooling roller group with gauze, etc.

[0072] 4. Coiling and storage cooling process parameters: The film is sent to the coiling section after heat preservation cooling by the cooling roller group, and is coiled under pressure by the coiling machine at a coiling speed of 55 m / min. Since the internal temperature of the just coiled film is between 60 °C, in order to ensure the high transparency of the film, it needs to be transferred to a cold storage at 20 °C in time for storage until it is cooled to room temperature. After testing, its performance is shown in Table 1 and Table 2.

[0073] Example 4

[0074] Raw material formula (mass ratio, parts): PVC resin (K value = 82) 100, antistatic plasticizer DBEEA 30, antistatic plasticizer DBEEG 10, non-antistatic non-cold-resistant plasticizer DINP 10, cold-resistant plasticizer DOA 10, ionic liquid polymer (H01-14) 3.0, liquid composite stabilizer 1.5, acrylate processing aid (PA-20) 1.0, lubricant 0.5. The preparation process is as follows:

[0075] Pre-mixing of plasticizer and ionic liquid polymer: The antistatic plasticizer DBEEA, the non-antistatic non-cold-resistant plasticizer DINP and the cold-resistant plasticizer DOA are automatically metered according to the formula ratio and added into a 3000L reaction kettle with stirring and jacket water heating. After controlling the stirring speed at 55 rpm and the stirring time at 8 min, the metered ionic liquid polymer is added, and it continues for 20 min until the temperature of the mixture reaches 70 °C and then it is kept warm for standby.

[0076] High-speed mixing of plasticized PVC powder: Put polyvinyl chloride resin and liquid composite stabilizer into a 500L hot mixing type high-speed mixer. First, start the low-speed mixing mode, with the rotation speed controlled at 350 rpm and the mixing time at 1 min; after adding half of the pre-mixed and pre-heated plasticizer / ionic liquid mixture, transfer to the high-speed mixing mode and mix evenly, with the rotation speed controlled at 800 rpm and the mixing time at 2 min; when the temperature rises to 50 °C, continue to add the remaining plasticizer / ionic liquid mixture; when all the plasticizers are completely absorbed by the resin, add liquid paraffin oil lubricant and continue to mix evenly until the material temperature rises to 90 °C, at which time the material is in a dry state and stop stirring; finally, discharge the evenly mixed material into an 800L low-speed mixer with jacket circulating water cooling, control the rotation speed at 70 rpm, and continue to mix until it is discharged at 40 °C into the storage bin.

[0077] Plasticization and Filtration of Plasticized PVC: The mixed powder is added to a twin-screw planetary extruder for plasticization and mixing. The barrel temperature is controlled at 160 - 180 °C, and the powder is preliminarily plasticized into a spiral chain-like material, which is then conveyed by a conveyor belt to a two-roll mill for further plasticization. The temperature of the two-roll mill is controlled at 140 - 170 °C. Due to the high content of plasticizer in the film formulation, the material in the two-roll mill is flipped every 5 - 10 minutes to ensure uniform plasticization. The uniformly plasticized material from the two-roll mill further enters a filter to filter out impurities. The barrel temperature of the filter is controlled at 160 - 180 °C, and the filter screen at the die head is a three-layer combined filter screen, with the filter screen specification being a three-layer stainless steel mesh sheet with a mesh count of 20 / 150 / 20 laminated together.

[0078] The filter screen at the die head is a three-layer combined filter screen, with the filter screen specification being a three-layer stainless steel mesh sheet with a mesh count of 20 / 150 / 20 laminated together.

[0079] Film Calendering and Cooling: The material filtered by the filter is conveyed along a conveyor belt to the main calender, and through processes such as four-roll calendering into a film, cooling in a constant-temperature water bath, roller cooling, winding, and storage cooling, a high-strength antistatic plasticized polyvinyl chloride transparent film is obtained.

[0080] 1. Process parameters for the four-roll calendering of the film: The temperature of the 1# roller is controlled at 180 °C and the speed is 15 m / min; the temperature of the 2# roller is controlled at 185 °C and the speed is 30 m / min; the temperature of the 3# roller is controlled at 185 °C and the speed is 40 m / min; the temperature of the 4# roller is controlled at 160 °C and the speed is 40 m / min.

[0081] 2. Process parameters for the water bath cooling of the film: The high-temperature film peeled off from the 4# roller of the calender immediately enters a constant-temperature water bath with a length of 12.0 meters and a water temperature of 35 °C for rapid cooling. The film passes through the bottom of the constant-temperature cooling water bath, and the cooling water bath is designed with control devices such as surface water discharge to remove oil stains and continuous water replenishment with clean water.

[0082] 3. Process parameters for roller cooling: The film rapidly cooled in the constant-temperature water bath is taken out and directly enters a cooling roller section composed of multiple rollers through an embossed smooth roller for further cooling. In view of the special requirement of high transparency of the film after passing through water, the cooling roller section needs to carry out heat preservation cooling treatment on the film, including controlling the speed of the cooling roller at 50 m / min, passing hot water with a temperature of 80 °C inside the cooling roller section for heat preservation, and wrapping the cooling roller group with gauze, etc.

[0083] 4. Process parameters for winding and storage cooling: The film is sent to the winding section after being heat preservation cooled by the cooling roller group and is wound under pressure by a winder, with a winding speed of 55 m / min. Since the internal temperature of the just-wound film is around 60 °C, to ensure the high transparency of the film, it needs to be promptly transferred to a cold storage at 20 °C for storage until it is cooled to room temperature. After testing, its performance is shown in Table 1 and Table 2.

[0084] Example 5

[0085] Raw material formula (mass ratio, parts): PVC resin (K value = 80) 100, antistatic plasticizer DBEEG 35, non-antistatic and non-freezing plasticizer DPHP 15, non-antistatic and non-freezing plasticizer DINP 5, freezing plasticizer DOZ 10, ionic liquid polymer (H01-14) 2.7, liquid composite stabilizer 1.2, acrylate processing aid (PA-20) 0.8, lubricant 0.4. The preparation process is as follows:

[0086] Pre-mixing of plasticizer and ionic liquid polymer: The antistatic plasticizer DBEEG, non-antistatic and non-freezing plasticizer DPHP, and freezing plasticizer DOZ are automatically metered according to the formula ratio and added to a 3000L reaction kettle with stirring and jacket water heating. After controlling the stirring speed at 50 rpm and the stirring time for 5 min, the metered ionic liquid polymer is added, and stirring continues for 15 min until the temperature of the mixture reaches 60 °C, then it is kept warm for standby.

[0087] High-speed mixing of plasticized PVC powder: Polyvinyl chloride resin and liquid composite stabilizer are put into a 500L hot-mixing type high-speed mixer. First, start the low-speed mixing mode with a rotation speed controlled at 350 rpm and a mixing time of 2 min; after adding half of the pre-mixed and pre-heated plasticizer / ionic liquid mixture, switch to the high-speed mixing mode and mix evenly, controlling the rotation speed at 750 rpm and the mixing time at 2 min; when the temperature rises to 55 °C, continue to add the remaining plasticizer / ionic liquid mixture; when all the plasticizer is completely absorbed by the resin, add liquid paraffin oil lubricant and continue to mix evenly until the material temperature rises to 85 °C, at which time the material is in a dry state and stop stirring; finally, discharge the evenly mixed material into an 800L low-speed mixer with jacket circulating water cooling, control the rotation speed at 70 rpm, and continue to mix until it is discharged to the storage bin at 40 °C.

[0088] Plasticization and filtration of plasticized PVC: The mixed powder is added to a twin-screw planetary extruder for plasticization and mixing. The barrel temperature is controlled at 160 - 180 °C, and the powder is initially plasticized into a spiral chain-like material, and then conveyed by a conveyor belt to a two-roll mill for further plasticization. The temperature of the two-roll mill is controlled at 140 - 170 °C. Since the plasticizer content in the film formula is relatively high, the material on the two-roll mill is turned over every 5 - 10 min to ensure uniform plasticization. The uniformly plasticized material on the two-roll mill further enters a filter to filter out impurities. The barrel temperature of the filter is controlled at 160 - 180 °C, and the filter screen at the discharge die head is a three-layer combined filter screen, and the filter screen specification is a three-layer stainless steel mesh sheet with a mesh number of 20 / 150 / 20 laminated.

[0089] Film calendering and cooling: The material filtered by the rubber filtering machine is conveyed along the conveyor belt to the calendering main machine, and through processes such as four-roll calendering into film, constant temperature water tank cooling, roll cooling, winding and storage cooling, a high-strength antistatic plasticized polyvinyl chloride transparent film is obtained.

[0090] 1. Process parameters for four-roll calendering of the film: The temperature of the 1# roll is controlled at 175°C and the speed is 10 m / min; the temperature of the 2# roll is controlled at 180°C and the speed is 20 m / min; the temperature of the 3# roll is controlled at 180°C and the speed is 30 m / min; the temperature of the 4# roll is controlled at 150°C and the speed is 30 m / min.

[0091] 2. Process parameters for water tank cooling of the film: The high-temperature film peeled off from the 4# roll of the calender immediately enters a constant temperature water tank with a length of 2.0 meters and a water temperature of 35°C for rapid cooling. The film passes through the bottom of the constant temperature cooling water tank, and the cooling water tank is designed with control devices such as surface water discharge to remove oil and continuous replenishment of clean water.

[0092] 3. Process parameters for roll cooling: The film rapidly cooled in the constant temperature water tank is taken out and directly enters the cooling roll section composed of multiple rolls through the embossing smooth roll for further cooling. In view of the special requirement of high transparency of the film after passing through water, the cooling roll section needs to carry out heat preservation cooling treatment on the film, including controlling the speed of the cooling roll at 45 m / min, passing hot water with a water temperature of 70°C inside the cooling roll section for heat preservation, and wrapping the cooling roll group with gauze, etc.

[0093] 4. Process parameters for winding and storage cooling: The film is sent to the winding section after heat preservation cooling by the cooling roll group and is wound under pressure by the winder, with a winding speed of 50 m / min. Since the internal temperature of the just-wound film is between 5°C, in order to ensure the high transparency of the film, it needs to be transferred to a cold storage at 20°C for storage in time until it is cooled to room temperature. Its performance is shown in Table 1 and Table 2 after testing.

[0094] Example 6

[0095] Raw material formula (mass ratio, parts): PVC resin (K value = 84) 100, antistatic plasticizer DBEEA 30, non-antistatic and non-cold-resistant plasticizer DIDP 15, cold-resistant plasticizer DOZ 10, cold-resistant plasticizer DOS 5, ionic liquid polymer (H01-14) 2.0, liquid composite stabilizer 1.5, acrylate processing aid (PA-20) 1.5, lubricant 0.5.

[0096] The preparation process is as follows:

[0097] Pre - mixing of plasticizer and ionic liquid polymer: The antistatic plasticizer DBEEA, the non - antistatic and non - cold - resistant plasticizer DIDP, and the cold - resistant plasticizers DOZ and DOS are automatically metered according to the formula ratio and then added into a 3000L reaction kettle with stirring and jacket water heating. After controlling the stirring speed at 60 rpm and the stirring time for 10 min, the metered ionic liquid polymer is added. Continue stirring for 15 min until the temperature of the mixture reaches 66 °C, and then keep it warm for standby.

[0098] High - speed mixing of plasticized PVC powder: Polyvinyl chloride resin and liquid compound stabilizer are put into a 500L hot - mixing type high - speed mixer. First, start the low - speed mixing mode with a rotation speed controlled at 400 rpm and a mixing time of 1 min. After adding half of the pre - mixed and pre - heated plasticizer / ionic liquid mixture, switch to the high - speed mixing mode and mix evenly, controlling the rotation speed at 850 rpm and the mixing time at 2 min. When the temperature rises to 50 °C, continue to add the remaining plasticizer / ionic liquid mixture. When all the plasticizer is completely absorbed by the resin, add liquid paraffin oil lubricant and continue to mix evenly until the material temperature rises to 90 °C. At this time, when the material is in a dry state, stop stirring. Finally, discharge the evenly - mixed material into an 800L low - speed mixer with jacket circulating water cooling, control the rotation speed at 65 rpm, and continue to mix until the temperature reaches 40 °C and then discharge it into the storage bin.

[0099] Plasticization and filtration of plasticized PVC: The mixed powder is added to a twin - screw planetary extruder for plasticization and mixing. The barrel temperature is controlled at 160 - 180 °C, and the powder is initially plasticized into a spiral - shaped chain - like material, and then conveyed by a conveyor belt to a two - roll mill for further plasticization. The temperature of the two - roll mill is controlled at 140 - 170 °C. Since the plasticizer content in the film formula is relatively high, the material on the two - roll mill is flipped every 5 - 10 min to ensure uniform plasticization. The uniformly - plasticized material on the two - roll mill further enters a filter to filter out impurities. The barrel temperature of the filter is controlled at 160 - 180 °C, and the filter screen at the discharge die head is a three - layer combined filter screen, and the filter screen specification is a three - layer stainless - steel mesh sheet with a mesh number of 20 / 150 / 20 laminated together.

[0100] Film calendering forming and cooling: The material filtered by the filter rubber machine is conveyed along the conveyor belt to the calendering main machine, and through processes such as four - roll calendering into a film, constant - temperature water tank cooling, roller cooling, winding and storage cooling, a high - strength antistatic plasticized polyvinyl chloride transparent film is obtained.

[0101] 1. Process parameters for film four - roll calendering forming: The temperature of the 1# roller is controlled at 170 °C and the speed is 5 m / min, the temperature of the 2# roller is controlled at 175 °C and the speed is 10 m / min, the temperature of the 3# roller is controlled at 175 °C and the speed is 20 m / min, and the temperature of the 4# roller is controlled at 140 °C and the speed is 25 m / min.

[0102] 2. Process parameters of film sink cooling: The high-temperature film peeled off from the 4# roller of the calender immediately enters a constant-temperature water tank with a length of 2.0 meters and a water temperature of 34°C for rapid cooling. The film passes through the bottom of the constant-temperature cooling water tank, and the cooling water tank is designed with control devices such as surface water discharge to remove oil and impurities and continuous water replenishment with clean water.

[0103] 3. Process parameters of roller cooling: The film quenched in the constant-temperature water tank is drawn out and directly enters the cooling roller section composed of multiple rollers through the embossed smooth roller for further cooling. In view of the special requirement of high transparency of the film after passing through water, the cooling roller section needs to carry out heat preservation and cooling treatment on the film, including controlling the speed of the cooling roller at 40 m / min, passing hot water with a temperature of 60°C inside the cooling roller section for heat preservation, and wrapping the cooling roller group with gauze.

[0104] 4. Process parameters of winding and storage cooling: The film is sent to the winding section after being heat-preserved and cooled by the cooling roller group, and is wound under pressure by the winder at a winding speed of 45 m / min. Since the internal temperature of the just-wound film is between 50°C, in order to ensure the high transparency of the film, it needs to be transferred to a cold storage at 20°C for storage in time until it is cooled to room temperature. After testing, its performance is shown in Table 1 and Table 2.

[0105] Example 7

[0106] Raw material formula (mass ratio, parts): PVC resin (K value = 84) 100, antistatic plasticizer DBEEA 30, non-antistatic and non-cold-resistant plasticizer DINP 15, non-antistatic and non-cold-resistant plasticizer DIDP 10, cold-resistant plasticizer DOA 10, ionic liquid polymer (H01-14) 2.8, liquid composite stabilizer 1.3, acrylate processing aid (PA-20) 1.2, lubricant 0.5. The preparation process is as follows:

[0107] Pre-mixing of plasticizer and ionic liquid polymer: The antistatic plasticizer DBEEA, non-antistatic and non-cold-resistant plasticizers DINP and DIDP, and cold-resistant plasticizer DOA are automatically metered according to the formula ratio and added to a 3000L reaction kettle with stirring and jacket water heating. After controlling the stirring speed at 55 rpm and the stirring time at 10 min, the metered ionic liquid polymer is added, and stirring continues for 16 min until the temperature of the mixture reaches 65°C, then it is kept warm for use.

[0108] High-speed mixing of plasticized PVC powder: Put polyvinyl chloride resin and liquid composite stabilizer into a 500L hot-mixing type high-speed mixer. First, start the low-speed mixing mode with a rotation speed controlled at 300 - 400 rpm and a mixing time of 1 - 2 minutes. After adding half of the pre-mixed and pre-heated plasticizer / ionic liquid mixture, switch to the high-speed mixing mode and mix evenly, controlling the rotation speed at 700 rpm and the mixing time at 3 minutes. When the temperature rises to 55°C, continue to add the remaining plasticizer / ionic liquid mixture. When all the plasticizer is completely absorbed by the resin, add liquid paraffin oil lubricant and continue to mix evenly until the material temperature rises to 85°C. At this time, when the material is in a dry state, stop stirring. Finally, discharge the evenly mixed material into an 800L low-speed mixer with jacketed circulating water cooling, control the rotation speed at 80 rpm, and continue to mix until it is discharged to the storage bin at 45°C.

[0109] Plasticization and filtration of plasticized PVC: Add the mixed powder to a twin-screw planetary extruder for plasticization and mixing. Control the barrel temperature at 160 - 180°C to initially plasticize the powder into a helical chain-like material, and then convey it to a calender by a conveyor belt for further plasticization. Control the temperature of the calender at 140 - 170°C. Since the plasticizer content in the film formula is relatively high, the calender flips the material once every 5 - 10 minutes to ensure uniform plasticization. The material plasticized evenly by the calender further enters a filter to filter out impurities. Control the barrel temperature of the filter at 160 - 180°C. The filter screen at the discharge die head is a three-layer combined filter screen, and the filter screen specification is a three-layer stainless steel mesh sheet with a mesh number of 20 / 150 / 20 laminated together.

[0110] Film calendering and cooling: The material filtered by the filter rubber machine is conveyed along the conveyor belt to the main calender, and through processes such as four-roll calendering into a film, constant temperature water tank cooling, roll cooling, winding and storage cooling, a high-strength antistatic plasticized polyvinyl chloride transparent film is obtained.

[0111] 1. Process parameters for film four-roll calendering: Control the temperature of the 1# roll at 180°C and the speed at 15 m / min, control the temperature of the 2# roll at 185°C and the speed at 25 m / min, control the temperature of the 3# roll at 185°C and the speed at 30 m / min, control the temperature of the 4# roll at 160°C and the speed at 40 m / min.

[0112] 2. Process parameters for film water tank cooling: The high-temperature film peeled off from the 4# roll of the calender immediately enters a constant temperature water tank with a length of 2.0 meters and a water temperature of 36°C for rapid cooling. The film passes through the bottom of the constant temperature cooling water tank, and the cooling water tank is designed with control devices such as surface water discharge to remove oil and continuous water replenishment with clean water.

[0113] 3. Roller cooling process parameters: The film quenched in a constant temperature water bath is taken out and directly enters the cooling roller section composed of multiple rollers through the embossed smooth roller for further cooling. In view of the special requirement of high transparency of the film after passing through water, the cooling roller section needs to perform heat preservation and cooling treatment on the film, including controlling the speed of the cooling roller at 55 m / min, passing hot water at 70 °C through the cooling roller section for heat preservation, and wrapping the cooling roller group with gauze, etc.

[0114] 4. Coiling and storage cooling process parameters: The film is sent to the coiling section after heat preservation and cooling by the cooling roller group, and is coiled under pressure by a coiler at a coiling speed of 505 m / min. Since the internal temperature of the just-coiled film is between 60 °C, in order to ensure the high transparency of the film, it needs to be transferred to a cold storage at 20 °C for storage in time until it is cooled to room temperature. After testing, its performance is shown in Table 1 and Table 2.

[0115] Example 8

[0116] Raw material formula (mass ratio, parts): PVC resin (K value = 80) 100, antistatic plasticizer DBEEG 30, non-antistatic non-cold-resistant plasticizer DPHP 10, non-antistatic non-cold-resistant plasticizer DINP 10, cold-resistant plasticizer DOS 10, ionic liquid polymer (H01-14) 3.0, liquid composite stabilizer 1.0, acrylate processing aid (PA-20) 1.0, lubricant 0.3. The preparation process is as follows:

[0117] Pre-mixing of plasticizer and ionic liquid polymer: The antistatic plasticizer DBEEG, non-antistatic non-cold-resistant plasticizers DPHP, DINP and cold-resistant plasticizer DOS are automatically metered according to the formula ratio and added to a 3000 L reaction kettle with stirring and jacket water heating. After controlling the stirring speed at 55 rpm and the stirring time at 10 min, the metered ionic liquid polymer is added, and it continues for 15 min until the temperature of the mixture reaches 65 °C and then it is kept warm for standby.

[0118] High-speed mixing of plasticized PVC powder: Polyvinyl chloride resin and liquid composite stabilizer are put into a 500 L hot-mixing type high-speed mixer. First, start the low-speed mixing mode, with the rotation speed controlled at 400 rpm and the mixing time at 2 min; after adding half of the pre-mixed and pre-heated plasticizer / ionic liquid mixture, transfer to the high-speed mixing mode and mix evenly, with the rotation speed controlled at 650 rpm and the mixing time at 2 min; when the temperature rises to 50 °C, continue to add the remaining plasticizer / ionic liquid mixture; when all the plasticizers are completely absorbed by the resin, add liquid paraffin oil lubricant and continue to mix evenly until the material temperature rises to 80 °C, at which time the material is in a dry state and stop stirring; finally, discharge the evenly mixed material into an 800 L low-speed mixer with jacket circulating water cooling, control the rotation speed at 90 rpm, and continue to mix until it is discharged to the storage bin at 45 °C.

[0119] Plasticization and Filtration of Plasticized PVC: The mixed powder is added to a twin-screw planetary extruder for plasticization and mixing. The barrel temperature is controlled at 160 - 180°C, and the powder is initially plasticized into a spiral chain-like material, which is then conveyed by a conveyor belt to a two-roll mill for further plasticization. The temperature of the two-roll mill is controlled at 140 - 170°C. Since the plasticizer content in the film formula is relatively high, the material in the two-roll mill is flipped every 5 - 10 minutes to ensure uniform plasticization. The uniformly plasticized material from the two-roll mill further enters a filter to filter out impurities. The barrel temperature of the filter is controlled at 160 - 180°C, and the filter screen at the discharge die head is a three-layer combined filter screen, with the filter screen specification being a three-layer stainless steel mesh sheet with a mesh count of 20 / 150 / 20 stacked together.

[0120] Film Calendering and Cooling: The material filtered by the filter is conveyed along the conveyor belt to the main calender, and through processes such as four-roll calendering into a film, constant-temperature water bath cooling, roll cooling, winding, and storage cooling, a high-strength antistatic plasticized polyvinyl chloride transparent film is obtained.

[0121] 1. Process Parameters for Film Four-Roll Calendering: The temperature of the 1# roll is controlled at 1775°C and the speed is 10 m / min, the temperature of the 2# roll is controlled at 180°C and the speed is 25 m / min, the temperature of the 3# roll is controlled at 180°C and the speed is 35 m / min, and the temperature of the 4# roll is controlled at 150°C and the speed is 40 m / min.

[0122] 2. Process Parameters for Film Water Bath Cooling: The high-temperature film peeled off from the 4# roll of the calender immediately enters a constant-temperature water bath with a length of 12.0 meters and a water temperature of 34°C for rapid cooling. The film passes through the bottom of the constant-temperature cooling water bath, and the cooling water bath is designed with control devices such as surface water discharge to remove oil and continuous water replenishment with clean water.

[0123] 3. Process Parameters for Roll Cooling: The film rapidly cooled in the constant-temperature water bath is drawn out and directly enters the cooling roll section composed of multiple rolls through a calendered smooth roll for further cooling. In view of the special requirement of high transparency of the film after passing through water, the cooling roll section needs to carry out heat preservation and cooling treatment on the film, including controlling the speed of the cooling roll at 50 m / min, passing hot water with a temperature of 665°C inside the cooling roll section for heat preservation, and wrapping the cooling roll group with gauze, etc.

[0124] 4. Process Parameters for Winding and Storage Cooling: The film is sent to the winding section after being heat-preserved and cooled by the cooling roll group, and is wound under pressure by a winder, with a winding speed of 50 m / min. Since the internal temperature of the just-wound film is between 55°C, in order to ensure the high transparency of the film, it needs to be promptly transferred to a cold storage at 20°C for storage until it is cooled to room temperature. After testing, its performance is shown in Table 1 and Table 2.

[0125] Example 9

[0126] Raw material formula (by mass ratio, parts): 100 parts of PVC resin (K value = 82), 32 parts of antistatic plasticizer DBEEG, 10 parts of non-antistatic and non-freezing plasticizer DINP, 10 parts of non-antistatic and non-freezing plasticizer DPHP, 10 parts of freezing plasticizer DOZ, 5 parts of freezing plasticizer DOA, 3.5 parts of ionic liquid polymer (H01-14), 1.2 parts of liquid composite stabilizer, 1.2 parts of acrylate processing aid (PA-20), 0.4 parts of lubricant. The preparation process is as follows:

[0127] Pre-mixing of plasticizer and ionic liquid polymer: Automatically measure the antistatic plasticizer DBEEG, non-antistatic and non-freezing plasticizers DINP and DIDP, and freezing plasticizer DOZ according to the formula ratio and add them into a 3000L reaction kettle with stirring and jacket water heating. Control the stirring speed at 60 rpm and the stirring time at 5 min, then add the measured ionic liquid polymer. Continue for 20 min until the temperature of the mixture reaches 70 °C and keep it warm for standby.

[0128] High-speed mixing of plasticized PVC powder: Put polyvinyl chloride resin and liquid composite stabilizer into a 500L hot mixing type high-speed mixer. First, start the low-speed mixing mode with a rotation speed controlled at 300 rpm and a mixing time of 2 min; after adding half of the pre-mixed and pre-heated plasticizer / ionic liquid mixture, transfer to the high-speed mixing mode and mix evenly, control the rotation speed at 900 rpm and the mixing time at 2 min; when the temperature rises to 60 °C, continue to add the remaining plasticizer / ionic liquid mixture; when all the plasticizers are completely absorbed by the resin, add liquid paraffin oil lubricant and continue to mix evenly until the material temperature rises to 85 °C, and stop stirring when the material is in a dry state; finally, discharge the evenly mixed material into an 800L low-speed mixer with jacket circulating water cooling, control the rotation speed at 80 rpm, and continue to mix until the temperature reaches 40 °C and discharge it into the storage bin.

[0129] Plasticization and filtration of plasticized PVC: Add the mixed powder into a twin-screw planetary extruder for plasticization and mixing. Control the barrel temperature at 160 - 180 °C to preliminarily plasticize the powder into a spiral chain-like material, and then transport it to a two-roll mill by a conveyor belt for further plasticization. Control the temperature of the two-roll mill at 140 - 170 °C. Since the plasticizer content in the film formula is relatively high, the two-roll mill flips the material every 5 - 10 min to ensure uniform plasticization. The uniformly plasticized material from the two-roll mill further enters a filter to filter out impurities. Control the barrel temperature of the filter at 160 - 180 °C, and the filter screen at the die head is a three-layer combined filter screen with a filter screen specification of three-layer stainless steel mesh sheets with mesh numbers 20 / 150 / 20 laminated together.

[0130] Film calendering and cooling: The material filtered by the rubber filter machine is conveyed along the conveyor belt to the calendering main machine, and is formed into a film through four-roll calendering, cooled in a constant temperature water tank, cooled by rollers, wound and stored and cooled, etc., to obtain a high-strength antistatic plasticized polyvinyl chloride transparent film.

[0131] 1. Process parameters for four-roll calendering of the film: The temperature of the 1# roller is controlled at 180°C and the speed is 15 m / min, the temperature of the 2# roller is controlled at 185°C and the speed is 30 m / min, the temperature of the 3# roller is controlled at 185°C and the speed is 40 m / min, and the temperature of the 4# roller is controlled at 160°C and the speed is 40 m / min.

[0132] 2. Process parameters for film water tank cooling: The high-temperature film peeled off from the 4# roller of the calender immediately enters a constant temperature water tank with a length of 12.0 meters and a water temperature of 36°C for rapid cooling. The film passes through the bottom of the constant temperature cooling water tank, and the cooling water tank is designed with control devices such as surface water discharge to remove oil stains and continuous water replenishment with clean water.

[0133] 3. Process parameters for roller cooling: The film quenched in the constant temperature water tank is drawn out and directly enters the cooling roller section composed of multiple rollers through the embossing and smooth rollers for further cooling. In view of the special requirement of high transparency of the film after passing through water, the cooling roller section needs to carry out heat preservation and cooling treatment on the film, including controlling the speed of the cooling roller at 50 m / min, passing hot water with a water temperature of 80°C in the cooling roller section for heat preservation, and wrapping the cooling roller group with gauze, etc.

[0134] 4. Process parameters for winding and storage cooling: The film is sent to the winding section after being heat-preserved and cooled by the cooling roller group, and is wound under pressure by the winder, and the winding speed is 55 m / min. Since the internal temperature of the just-wound film is between 60°C, in order to ensure the high transparency of the film, it needs to be transferred to a cold storage at 20°C in time for storage until it is cooled to room temperature. Its performance is shown in Table 1 and Table 2 after testing.

[0135] Example 10

[0136] Raw material formula (mass ratio, parts): PVC resin (K value = 84) 100, antistatic plasticizer DBEEA 35, non-antistatic and non-cold-resistant plasticizer DIDP 15, cold-resistant plasticizer DOA 7, cold-resistant plasticizer DOZ 6, ionic liquid polymer (H01-14) 3.2, liquid composite stabilizer 1.5, acrylate processing aid (PA-20) 1.5, lubricant 0.5.

[0137] The preparation process is as follows:

[0138] Pre - mixing of plasticizer and ionic liquid polymer: The antistatic plasticizer DBEEA, the non - antistatic and non - cold - resistant plasticizer DIDP, and the cold - resistant plasticizers DOA and DOZ are automatically metered according to the formula ratio and added into a 3000L reaction kettle with stirring and jacket water heating. After controlling the stirring speed at 60 rpm and the stirring time for 10 min, the metered ionic liquid polymer is added. Continue stirring for 15 min until the temperature of the mixture reaches 65 °C, and then keep it warm for standby.

[0139] High - speed mixing of plasticized PVC powder: Polyvinyl chloride resin and liquid compound stabilizer are put into a 500L hot - mixing type high - speed mixer. First, start the low - speed mixing mode with a rotation speed controlled at 350 rpm and a mixing time of 2 min. After adding half of the pre - mixed and pre - heated plasticizer / ionic liquid mixture, switch to the high - speed mixing mode and mix evenly, controlling the rotation speed at 700 rpm and the mixing time at 3 min. When the temperature rises to 55 °C, continue to add the remaining plasticizer / ionic liquid mixture. When all the plasticizer is completely absorbed by the resin, add liquid paraffin oil lubricant and continue to mix evenly until the material temperature rises to 90 °C. At this time, when the material is in a dry state, stop stirring. Finally, discharge the uniformly mixed material into an 800L low - speed mixer with jacketed circulating water cooling, control the rotation speed at 80 rpm, and continue to mix until the temperature reaches 35 °C and then discharge it into the storage bin.

[0140] Plasticization and filtration of plasticized PVC: The mixed powder is added to a twin - screw planetary extruder for plasticization and mixing. The barrel temperature is controlled at 160 - 180 °C, and the powder is initially plasticized into a spiral - shaped chain - like material, and then conveyed by a conveyor belt to a two - roll mill for further plasticization. The temperature of the two - roll mill is controlled at 140 - 170 °C. Since the plasticizer content in the film formula is relatively high, the material on the two - roll mill is turned over every 5 - 10 min to ensure uniform plasticization. The uniformly plasticized material on the two - roll mill further enters a filter to filter out impurities. The barrel temperature of the filter is controlled at 160 - 180 °C, and the filter screen at the discharge die head is a three - layer combined filter screen, with the filter screen specification being a three - layer stainless steel mesh sheet with a mesh number of 20 / 150 / 20 laminated together.

[0141] Film calendering forming and cooling: The material filtered by the filter rubber machine is conveyed along the conveyor belt to the calender main machine, and through processes such as four - roll calendering into a film, constant - temperature water bath cooling, roll cooling, winding and storage cooling, a high - strength antistatic plasticized polyvinyl chloride transparent film is obtained.

[0142] 1. Process parameters for film four - roll calendering forming: The temperature of the 1# roll is controlled at 170 °C and the speed is 5 m / min; the temperature of the 2# roll is controlled at 175 °C and the speed is 10 m / min; the temperature of the 3# roll is controlled at 175 °C and the speed is 20 m / min; the temperature of the 4# roll is controlled at 140 °C and the speed is 25 m / min.

[0143] 2. Process parameters of film sink cooling: The high-temperature film peeled off from the 4# roller of the calender immediately enters a constant-temperature water tank with a length of 2.0 meters and a water temperature of 34°C for rapid cooling. The film passes through the bottom of the constant-temperature cooling water tank, and the cooling water tank is designed with control devices such as surface water discharge to remove oil and dirt, continuous makeup of clean water, etc.

[0144] 3. Process parameters of roller cooling: The film quenched in the constant-temperature water tank is drawn out and directly enters the cooling roller section composed of multiple rollers through the embossed smooth roller for further cooling. In view of the special requirement of high transparency of the film after passing through water, the cooling roller section needs to carry out heat preservation and cooling treatment on the film, including controlling the speed of the cooling roller at 40 m / min, passing hot water with a temperature of 60°C inside the cooling roller section for heat preservation, and wrapping the cooling roller group with gauze, etc.

[0145] 4. Process parameters of winding and storage cooling: The film is sent to the winding section after heat preservation and cooling by the cooling roller group, and is wound under pressure by the winder, and the winding speed is 45 m / min. Since the internal temperature of the just-wound film is between 50°C, in order to ensure the high transparency of the film, it needs to be transferred to a cold storage at 20°C in time for storage until it is cooled to room temperature. After testing, its performance is shown in Table 1 and Table 2.

[0146] Comparative Example 1

[0147] Raw material formula (mass ratio, parts): PVC resin (K value = 72) 100, plasticizer DBEEA 60, liquid compound stabilizer 1.5. The preparation process is as follows:

[0148] High-speed mixing of plasticized PVC powder: Put PVC resin and liquid compound stabilizer into a 500L hot-mixing type high-speed mixer. First, start the low-speed mixing mode, control its rotation speed at 300 rpm, and the mixing time is 2 min. Add half of the plasticizer DBEEA and transfer to the high-speed mixing mode to mix evenly, control the rotation speed at 800 rpm, and the mixing time is 3 min; when the temperature rises to 50°C, continue to add the remaining DBEEA plasticizer; when all the plasticizers are completely absorbed by the resin and the material temperature rises to 90°C at the same time, observe the dry and wet state of the powder. The best state is when it is dry and does not form a ball when held in the hand, then stop stirring. Finally, discharge the evenly mixed material into an 800L low-speed mixer with jacketed circulating water cooling, control the rotation speed at 80 rpm, and continue to mix until it is discharged to the storage bin at 35°C.

[0149] Plasticization and Filtration of Plasticized PVC: Control the temperature of the internal mixer at 150°C, add the mixed plasticized PVC powder material into the internal mixer for melting and plasticization, and the blending time of the internal mixer is 4 minutes; the blended material from the internal mixer is transported to the two-roll mill for further plasticization, control the roll speed of the two-roll mill at 50 r / min, and the temperature of the two-roll mill at 165°C; the filter mesh of the filter is a three-layer laminated metal filter mesh, and the mesh numbers of its mesh holes are 20, 100, and 20 respectively. Control the temperature of the filter at 175°C and the return water temperature of the machine body at 40°C to prevent the material temperature from being too high, and the high melt strength causes excessive frictional heating and early degradation of PVC.

[0150] Film Calendering: The material filtered by the rubber filter is conveyed along the conveyor belt to the calender main machine, and after calendering into a film, leading away, embossing, cooling, and winding, a plasticized PVC transparent film is obtained; the film forming parameters of the four-roll calender are: the temperature of the 1# roll is controlled at 180°C and the speed is 10 m / min, the temperature of the 2# roll is controlled at 180°C and the speed is 15 m / min, the temperature of the 3# roll is controlled at 185°C and the speed is 20 m / min, the temperature of the 4# roll is controlled at 150°C and the speed is 20 m / min; the parameters for leading away and embossing are: 1 leading wheel in the first stage, the temperature is controlled at 150°C and the speed is 30 m / min; 2 leading wheels in the second stage, the temperature is controlled at 150°C and the speed is 30 m / min; 2 leading wheels in the third stage, at 150°C, and the speed is 40 m / min; the parameters for cooling and winding are: the temperature of the cooling roll is controlled at 50°C and the speed is 40 m / min, and the winding speed is 45 m / min. After testing, its performance is shown in Table 3 and Table 4.

[0151] Comparative Example 2

[0152] Raw Material Formula (mass ratio, parts): PVC resin (K value = 82) 100, plasticizer DBEEG 60, acrylate processing aid (PA-20) 1, liquid composite stabilizer 1.5, lubricant 0.5. The preparation process is as follows:

[0153] High-Speed Mixing of Plasticized PVC Powder: Put the PVC resin and liquid composite stabilizer into a 500L hot-mixing type high-speed mixer, first start the low-speed mixing mode, control its rotation speed at 300 rpm, and the mixing time at 2 minutes. Add half of the plasticizer DBEEG and switch to the high-speed mixing mode to mix evenly, control the rotation speed at 800 rpm, and the mixing time at 3 minutes; when the temperature rises to 50°C, continue to add the remaining DBEEG plasticizer; when all the plasticizers are completely absorbed by the resin, add the lubricant and processing aid and continue to mix evenly until the material temperature rises to 90°C. Observe the dry and wet state of the powder. The best state is when it is dry and does not form a ball when held in the hand, then stop stirring. Finally, discharge the evenly mixed material into an 800L low-speed mixer with a jacketed circulating water cooler, control the rotation speed at 80 rpm, and continue to mix until it is discharged to the storage bin at 35°C.

[0154] Plasticized PVC Plasticization and Filtration: Control the temperature of the internal mixer at 150 °C, add the mixed plasticized PVC powder material into the internal mixer for melting and plasticization, and the blending time of the internal mixer is 4 min; the blended material in the internal mixer is transported to the two-roll mill for further plasticization, control the roller speed of the two-roll mill at 50 r / min, and the temperature of the two-roll mill at 165 °C; the filter mesh of the filter is a three-layer laminated metal filter screen, and the mesh numbers of its mesh holes are 20, 100, and 20 respectively. Control the temperature of the filter at 175 °C and the return water temperature of the machine body at 40 °C to prevent the material temperature from being too high and the melt strength from being too large, resulting in excessive frictional heating and early degradation of PVC.

[0155] Film Calendering: The material filtered by the rubber filter is conveyed along the conveyor belt to the calender main machine, and after calendering into a film, guiding away, embossing, cooling, and winding, a plasticized PVC transparent film is obtained; the film forming parameters of the four-roll calender are: the temperature of the 1# roller is controlled at 180 °C, the speed is 10 m / min, the temperature of the 2# roller is controlled at 180 °C, the speed is 15 m / min, the temperature of the 3# roller is controlled at 185 °C, the speed is 20 m / min, and the temperature of the 4# roller is controlled at 150 °C, the speed is 20 m / min; the parameters for guiding away and embossing are: 1 guiding wheel in the first stage, the temperature is controlled at 150 °C, the speed is 30 m / min; 2 guiding wheels in the second stage, the temperature is controlled at 150 °C, the speed is 30 m / min; 2 guiding wheels in the third stage, 150 °C, the speed is 40 m / min; the parameters for cooling and winding are: the temperature of the cooling roller is controlled at 50 °C, the speed is 40 m / min, and the winding speed is 45 m / min. After testing, its performance is shown in Table 3 and Table 4.

[0156] Comparative Example 3

[0157] Raw Material Formula (mass ratio, parts): PVC resin (K value = 72) 100, plasticizer DINP 60, liquid composite stabilizer 1.5. The preparation process is as follows:

[0158] High-Speed Mixing of Plasticized PVC Powder: Put PVC resin and liquid composite stabilizer into a 500L hot-mixing type high-speed mixer. First, start the low-speed mixing mode, control its rotation speed at 300 rpm, the mixing time is 2 min, add half of the plasticizer DINP and transfer to the high-speed mixing mode to mix evenly, control the rotation speed at 800 rpm, and the mixing time is 3 min; when the temperature rises to 50 °C, continue to add the remaining DINP plasticizer; when all the plasticizers are completely absorbed by the resin and the material temperature rises to 90 °C, observe the dry and wet state of the powder. The best state is when it is dry and does not form a ball when held in the hand, then stop stirring. Finally, discharge the evenly mixed material into an 800L low-speed mixer with jacketed circulating water cooling, control the rotation speed at 80 rpm, continue to mix until 35 °C and discharge it into the storage bin.

[0159] Plasticization and Filtration of Plasticized PVC: Control the temperature of the internal mixer at 150°C. Add the mixed plasticized PVC powder material to the internal mixer for melting and plasticization. The blending time of the internal mixer is 4 minutes. The blended material from the internal mixer is transported to the two-roll mill for further plasticization. Control the roll speed of the two-roll mill at 50 r / min and the temperature at 165°C. The filter screen of the filter machine uses a three-layer laminated metal filter screen, and the mesh numbers of its mesh holes are 20, 100, and 20 respectively. Control the temperature of the filter machine at 175°C and the return water temperature of the machine body at 40°C to prevent the material temperature from being too high, and the high melt strength from causing excessive frictional heating and early degradation of PVC.

[0160] Film Calendering Forming: The material filtered by the rubber filter machine is conveyed along the conveyor belt to the calender main machine. After calendering into a film, leading away, embossing, cooling, and winding, a plasticized PVC transparent film is obtained. The film forming parameters of the four-roll calender are as follows: The temperature of the 1# roll is controlled at 180°C and the speed at 10 m / min; the temperature of the 2# roll is controlled at 180°C and the speed at 15 m / min; the temperature of the 3# roll is controlled at 185°C and the speed at 20 m / min; the temperature of the 4# roll is controlled at 150°C and the speed at 20 m / min. The parameters for leading away and embossing are as follows: There is 1 leading wheel in the first stage, with the temperature controlled at 150°C and the speed at 30 m / min; there are 2 leading wheels in the second stage, with the temperature controlled at 150°C and the speed at 30 m / min; there are 2 leading wheels in the third stage, at 150°C and the speed at 40 m / min. The parameters for cooling and winding are as follows: The temperature of the cooling roll is controlled at 50°C and the speed at 40 m / min, and the winding speed is 45 m / min. After testing, its performance is shown in Table 3 and Table 4.

[0161] Comparative Example 4

[0162] Raw Material Formula (mass ratio, parts): PVC resin (K value = 72) 100, DBEEG 15, plasticizer DPHP 45, liquid composite stabilizer 1.5. The preparation process is as follows:

[0163] High-Speed Mixing of Plasticized PVC Powder: Put the PVC resin and liquid composite stabilizer into a 500L hot-mixing type high-speed mixer. First, start the low-speed mixing mode, with the rotation speed controlled at 300 rpm and the mixing time at 2 minutes. Add the plasticizer DBEEG and part of DPHP and transfer to the high-speed mixing mode to mix evenly. Control the rotation speed at 800 rpm and the mixing time at 3 minutes. When the temperature rises to 50°C, continue to add the remaining DPHP plasticizer. When all the plasticizers are completely absorbed by the resin and the material temperature rises to 90°C, observe the dry-wet state of the powder. The best state is when it is dry and does not form a ball when held in the hand, then stop stirring. Finally, discharge the evenly mixed material into an 800L low-speed mixer with jacketed circulating water cooling, control the rotation speed at 80 rpm, and continue to mix until it is discharged at 35°C into the storage bin.

[0164] Plasticization and Filtration of Plasticized PVC: Control the temperature of the internal mixer at 150 °C, add the mixed plasticized PVC powder material to the internal mixer for melting and plasticization, and the blending time of the internal mixer is 4 min; the blended material from the internal mixer is transported to the two-roll mill for further plasticization, control the roll speed of the two-roll mill at 50 r / min, and the temperature of the two-roll mill at 165 °C; the filter mesh of the filter is a three-layer laminated metal filter mesh, and the mesh numbers of its mesh holes are 20, 100, and 20 respectively. Control the temperature of the filter at 175 °C and the return water temperature of the machine body at 40 °C to prevent the material temperature from being too high and the melt strength from being too large, resulting in excessive frictional heating and early degradation of PVC.

[0165] Film Calendering: The material filtered by the rubber filter is conveyed along the conveyor belt to the calender main machine, and after calendering into a film, guiding away, embossing, cooling, and winding, a plasticized PVC transparent film is obtained; the film forming parameters of the four-roll calender are: the temperature of the 1# roll is controlled at 180 °C and the speed is 10 m / min, the temperature of the 2# roll is controlled at 180 °C and the speed is 15 m / min, the temperature of the 3# roll is controlled at 185 °C and the speed is 20 m / min, the temperature of the 4# roll is controlled at 150 °C and the speed is 20 m / min; the parameters for guiding away and embossing are: 1 guiding wheel in the first stage, the temperature is controlled at 150 °C and the speed is 30 m / min; 2 guiding wheels in the second stage, the temperature is controlled at 150 °C and the speed is 30 m / min; 2 guiding wheels in the third stage, 150 °C, and the speed is 40 m / min; the parameters for cooling and winding are: the temperature of the cooling roll is controlled at 50 °C and the speed is 40 m / min, and the winding speed is 45 m / min. After testing, its performance is shown in Table 3 and Table 4.

[0166] Comparative Example 5

[0167] Raw Material Formula (mass ratio, parts): PVC resin (K value = 72) 100, DBEEA 15, plasticizer DPHP 35, plasticizer DOS 10, liquid composite stabilizer 1.5. The preparation process is as follows:

[0168] High-Speed Mixing of Plasticized PVC Powder: Put PVC resin and liquid composite stabilizer into a 500L hot mixing type high-speed mixer, first start the low-speed mixing mode, control its rotation speed at 300 rpm, and the mixing time at 2 min, add plasticizer DPHP and transfer to the high-speed mixing mode to mix evenly, control the rotation speed at 800 rpm, and the mixing time at 3 min; when the temperature rises to 50 °C, continue to add plasticizers DBEEA and DOS; when all the plasticizers are completely absorbed by the resin and the material temperature rises to 90 °C, observe the dry-wet state of the powder, and stop stirring when the best state is the dry state where it does not form a ball when held in the hand. Finally, discharge the evenly mixed material into an 800L low-speed mixer with jacketed circulating water cooling, control the rotation speed at 80 rpm, and continue to mix until it is discharged to the storage bin at 35 °C.

[0169] Plasticized PVC Plasticization and Filtration: Control the temperature of the internal mixer at 150°C. Add the mixed plasticized PVC powder material to the internal mixer for melting and plasticization. The blending time of the internal mixer is 4 minutes. The blended material from the internal mixer is transported to the two-roll mill for further plasticization. Control the roll speed of the two-roll mill at 50 r / min and the temperature at 165°C. The filter screen of the filter is a three-layer laminated metal filter screen, and the mesh numbers of its mesh holes are 20, 100, and 20 respectively. Control the temperature of the filter at 175°C and the return water temperature of the machine body at 40°C to prevent the material temperature from being too high, and the high melt strength causes excessive frictional heating and early degradation of PVC.

[0170] Film Calendering Forming: The material filtered by the rubber filter is conveyed along the conveyor belt to the calender main machine. After calendering into a film, guiding away, embossing, cooling, and winding, a plasticized PVC transparent film is obtained. The film forming parameters of the four-roll calender are as follows: The temperature of the 1# roll is controlled at 180°C and the speed is 10 m / min; the temperature of the 2# roll is controlled at 180°C and the speed is 15 m / min; the temperature of the 3# roll is controlled at 185°C and the speed is 20 m / min; the temperature of the 4# roll is controlled at 150°C and the speed is 20 m / min. The parameters for guiding away and embossing are as follows: There is 1 guiding wheel in the first stage, the temperature is controlled at 150°C and the speed is 30 m / min; there are 2 guiding wheels in the second stage, the temperature is controlled at 150°C and the speed is 30 m / min; there are 2 guiding wheels in the third stage, at 150°C and the speed is 40 m / min. The parameters for cooling and winding are as follows: The temperature of the cooling roll is controlled at 50°C and the speed is 40 m / min, and the winding speed is 45 m / min. After testing, its performance is shown in Table 3 and Table 4.

[0171] Comparative Example 6

[0172] Raw Material Formula (mass ratio, parts): PVC resin (K value = 72) 100, DBEEA 60, ionic liquid polymer (H01-14) 1.0, liquid composite stabilizer 1.5. The preparation process is as follows:

[0173] High-Speed Mixing of Plasticized PVC Powder: Put PVC resin and liquid composite stabilizer into a 500L hot-mixing type high-speed mixer. First, start the low-speed mixing mode, control its rotation speed at 300 rpm, and the mixing time is 2 minutes. Add half of the plasticizer DBEEA and ionic liquid polymer and transfer to the high-speed mixing mode to mix evenly. Control the rotation speed at 800 rpm and the mixing time at 3 minutes. When the temperature rises to 50°C, continue to add the remaining DBEEA plasticizer. When all the plasticizers are completely absorbed by the resin and the material temperature rises to 90°C, observe the dry and wet state of the powder. The best state is when it is dry and does not form a ball when held in the hand, then stop stirring. Finally, discharge the evenly mixed material into an 800L low-speed mixer with jacketed circulating water cooling, control the rotation speed at 80 rpm, and continue to mix until it is discharged at 35°C into the storage bin.

[0174] Plasticized PVC Plasticization and Filtration: Control the temperature of the internal mixer at 150 °C, add the mixed plasticized PVC powder material to the internal mixer for melting and plasticization, and the blending time of the internal mixer is 4 min; the blended material in the internal mixer is transported to the two-roll mill for further plasticization, control the roll speed of the two-roll mill at 50 r / min, and the temperature of the two-roll mill at 165 °C; the filter mesh of the filter is a three-layer laminated metal filter mesh, and the mesh numbers of its mesh holes are 20, 100, and 20 respectively. Control the temperature of the filter at 175 °C and the return water temperature of the machine body at 40 °C to prevent the material temperature from being too high and the melt strength from being too high, resulting in excessive frictional heating and early degradation of PVC.

[0175] Film Calendering Forming: The material filtered by the rubber filter is conveyed along the conveyor belt to the calender main machine, and after calendering into a film, guiding away, embossing, cooling, and winding, a plasticized PVC transparent film is obtained; the film forming parameters of the four-roll calender are: the temperature of the 1# roll is controlled at 180 °C and the speed is 10 m / min, the temperature of the 2# roll is controlled at 180 °C and the speed is 15 m / min, the temperature of the 3# roll is controlled at 185 °C and the speed is 20 m / min, the temperature of the 4# roll is controlled at 150 °C and the speed is 20 m / min; the parameters for guiding away and embossing are: 1 guiding wheel in the first stage, the temperature is controlled at 150 °C and the speed is 30 m / min; 2 guiding wheels in the second stage, the temperature is controlled at 150 °C and the speed is 30 m / min; 2 guiding wheels in the third stage, 150 °C, and the speed is 40 m / min; the parameters for cooling and winding are: the temperature of the cooling roll is controlled at 50 °C and the speed is 40 m / min, and the winding speed is 45 m / min. After testing, its performance is shown in Table 3 and Table 4.

[0176] Comparative Example 7

[0177] Raw Material Formula (mass ratio, parts): PVC resin (K value = 72) 100, DBEEA 15, plasticizer DINP 45, ionic liquid polymer (H01-14) 1.0, liquid composite stabilizer 1.5. The preparation process is as follows:

[0178] High-Speed Mixing of Plasticized PVC Powder: Put PVC resin and liquid composite stabilizer into a 500L hot-mixing type high-speed mixer, first start the low-speed mixing mode, control its rotation speed at 300 rpm, and the mixing time is 2 min. Add plasticizer DBEEA, part of DINP, and ionic liquid polymer and transfer to the high-speed mixing mode to mix evenly, control the rotation speed at 800 rpm, and the mixing time is 3 min; when the temperature rises to 50 °C, continue to add the remaining DINP plasticizer; when all the plasticizers are completely absorbed by the resin and the material temperature rises to 90 °C, observe the dry and wet state of the powder. The best state is when it is dry and does not form a ball when held in the hand, then stop stirring. Finally, discharge the evenly mixed material into an 800L low-speed mixer with jacketed circulating water cooling, control the rotation speed at 80 rpm, and continue to mix until it is discharged to the storage bin at 35 °C.

[0179] Plasticized PVC Plasticization and Filtration: Control the temperature of the internal mixer at 150°C. Add the mixed plasticized PVC powder material to the internal mixer for melting and plasticization. The blending time of the internal mixer is 4 minutes. The blended material from the internal mixer is transported to the two-roll mill for further plasticization. Control the roll speed of the two-roll mill at 50 r / min and the temperature at 165°C. The filter mesh of the filter is a three-layer laminated metal filter screen, and the mesh numbers of its mesh holes are 20, 100, and 20 respectively. Control the temperature of the filter at 175°C and the return water temperature of the machine body at 40°C to prevent the material temperature from being too high and the melt strength from being too large, resulting in excessive frictional heating and early degradation of PVC.

[0180] Film Calendering: The material filtered by the rubber filter is conveyed along the conveyor belt to the calender main machine. After calendering into a film, guiding away, embossing, cooling, and winding, a plasticized PVC transparent film is obtained. The film forming parameters of the four-roll calender are: the temperature of the 1# roll is controlled at 180°C and the speed is 10 m / min; the temperature of the 2# roll is controlled at 180°C and the speed is 15 m / min; the temperature of the 3# roll is controlled at 185°C and the speed is 20 m / min; the temperature of the 4# roll is controlled at 150°C and the speed is 20 m / min. The parameters for guiding away and embossing are: 1 guiding wheel in the first stage, the temperature is controlled at 150°C and the speed is 30 m / min; 2 guiding wheels in the second stage, the temperature is controlled at 150°C and the speed is 30 m / min; 2 guiding wheels in the third stage, at 150°C and the speed is 40 m / min. The parameters for cooling and winding are: the temperature of the cooling roll is controlled at 50°C and the speed is 40 m / min, and the winding speed is 45 m / min. After testing, its performance is shown in Table 3 and Table 4.

[0181] Comparative Example 8

[0182] Raw Material Formula (mass ratio, parts): PVC resin (K value = 72) 100, DBEEA 15, plasticizer DPHP 35, plasticizer DOA 10, ionic liquid polymer (H01 - 14) 1.0, liquid composite stabilizer 1.5. The preparation process is as follows:

[0183] High-Speed Mixing of Plasticized PVC Powder: Put PVC resin and liquid composite stabilizer into a 500L hot-mixing type high-speed mixer. First, start the low-speed mixing mode, with the rotation speed controlled at 300 rpm and the mixing time of 2 minutes. Add plasticizer DPHP and ionic liquid polymer and transfer to the high-speed mixing mode to mix evenly, with the rotation speed controlled at 800 rpm and the mixing time of 3 minutes. When the temperature rises to 50°C, continue to add DBEEA and DOS plasticizers. When all plasticizers are completely absorbed by the resin and the material temperature rises to 90°C, observe the dry-wet state of the powder. The best state is when it is dry and does not form a ball when held in the hand, then stop stirring. Finally, discharge the evenly mixed material into an 800L low-speed mixer with a jacketed circulating water cooling, control the rotation speed at 80 rpm, and continue to mix until it is discharged at 35°C into the storage bin.

[0184] Plasticization and Filtration of Plasticized PVC: Control the temperature of the internal mixer at 150°C, add the mixed plasticized PVC powder materials into the internal mixer for melting and plasticization, and the blending time of the internal mixer is 4 minutes; the blended materials are transported to the two-roll mill for further plasticization, control the roll speed of the two-roll mill at 50 r / min, and the temperature of the two-roll mill at 165°C; the filter screen of the filter is a three-layer laminated metal filter screen, and the mesh numbers of its mesh holes are 20, 100, and 20 respectively. Control the temperature of the filter at 175°C and the return water temperature of the machine body at 40°C to prevent the material temperature from being too high, and the high melt strength causes excessive frictional heating and early degradation of PVC.

[0185] Film Calendering: The materials filtered by the rubber filter are conveyed along the conveyor belt to the calender main machine, and the plasticized PVC transparent film is obtained after calendering into a film, guiding away and embossing, cooling and winding; the film forming parameters of the four-roll calender are: the temperature of the 1# roll is controlled at 180°C and the speed is 10 m / min, the temperature of the 2# roll is controlled at 180°C and the speed is 15 m / min, the temperature of the 3# roll is controlled at 185°C and the speed is 20 m / min, the temperature of the 4# roll is controlled at 150°C and the speed is 20 m / min; the parameters of guiding away and embossing are: 1 guiding wheel in the first stage, the temperature is controlled at 150°C and the speed is 30 m / min; 2 guiding wheels in the second stage, the temperature is controlled at 150°C and the speed is 30 m / min; 2 guiding wheels in the third stage, 150°C, and the speed is 40 m / min; the parameters of cooling and winding are: the temperature of the cooling roll is controlled at 50°C and the speed is 40 m / min, and the winding speed is 45 m / min. The detected performance is shown in Table 3 and Table 4.

[0186] Comparative Example 9

[0187] Raw Material Formula (mass ratio, parts): PVC resin (K value = 82) 100, DBEEA 15, plasticizer DPHP 45, ionic liquid polymer (H01-14) 1.0, liquid composite stabilizer 1.5, acrylate processing aid (PA-20) 1.0, lubricant 0.5. The preparation process is as follows:

[0188] High-speed mixing of plasticized PVC powder: Put PVC resin and liquid composite stabilizer into a 500L hot-mixed high-speed mixer. First, start the low-speed mixing mode with a rotation speed controlled at 300 rpm and a mixing time of 2 min. Then add plasticizer DPHP and ionic liquid polymer and switch to the high-speed mixing mode to mix evenly, with the rotation speed controlled at 800 rpm and a mixing time of 3 min. When the temperature rises to 50 °C, continue to add DBEEA plasticizer. When all the plasticizers are completely absorbed by the resin, add processing aids and lubricants, and continue to mix until the material temperature rises to 90 °C. Observe the dry and wet state of the powder. The best state is when it is dry and does not form a ball when held in the hand, then stop stirring. Finally, discharge the evenly mixed material into an 800L low-speed mixer with jacketed circulating water cooling, control the rotation speed at 80 rpm, and continue to mix until it is discharged to the storage bin at 35 °C.

[0189] Plasticization and filtration of plasticized PVC: Control the temperature of the internal mixer at 150 °C, add the mixed plasticized PVC powder material to the internal mixer for melting and plasticization, and the total mixing time of the internal mixer is 4 min. The material mixed in the internal mixer is transported to the two-roll mill for further plasticization, control the roll speed of the two-roll mill at 50 r / min, and the temperature of the two-roll mill at 165 °C. The filter screen of the filter is a three-layer laminated metal filter screen, and the mesh numbers of its mesh holes are 20, 100, and 20 respectively. Control the temperature of the filter at 175 °C and the return water temperature of the machine body at 40 °C to prevent the material temperature from being too high, and the high melt strength causes excessive frictional heating and early degradation of PVC.

[0190] Film calendering and forming: The material filtered by the filter is conveyed along the conveyor belt to the calender main machine, and after calendering into a film, leading away, embossing, cooling, and winding, a plasticized PVC transparent film is obtained. The film forming parameters of the four-roll calender are: the temperature of the 1# roll is controlled at 180 °C and the speed is 10 m / min, the temperature of the 2# roll is controlled at 180 °C and the speed is 15 m / min, the temperature of the 3# roll is controlled at 185 °C and the speed is 20 m / min, the temperature of the 4# roll is controlled at 150 °C and the speed is 20 m / min; the parameters of leading away and embossing are: 1 leading wheel in the first stage, the temperature is controlled at 150 °C and the speed is 30 m / min; 2 leading wheels in the second stage, the temperature is controlled at 150 °C and the speed is 30 m / min; 2 leading wheels in the third stage, 150 °C, and the speed is 40 m / min; the parameters of cooling and winding are: the temperature of the cooling roll is controlled at 50 °C and the speed is 40 m / min, and the winding speed is 45 m / min. After testing, its performance is shown in Table 3 and Table 4.

[0191] Comparative Example 10

[0192] Raw material formula (by mass ratio, parts): PVC resin (K value = 82) 100, DBEEA 15, plasticizer DINP 35, plasticizer DOS 10, ionic liquid polymer (H01-14) 1.0, liquid composite stabilizer 1.5, acrylate processing aid (PA-20) 1.0, lubricant 0.5. The preparation process is as follows:

[0193] High-speed mixing of plasticized PVC powder: Put PVC resin and liquid composite stabilizer into a 500L hot mixing type high-speed mixer. First, start the low-speed mixing mode with a rotation speed controlled at 300 rpm and a mixing time of 2 min. Add plasticizer DINP and ionic liquid polymer and switch to the high-speed mixing mode to mix evenly, with a rotation speed controlled at 800 rpm and a mixing time of 3 min; when the temperature rises to 50 °C, continue to add plasticizers DBEEA and DOS; when all plasticizers are completely absorbed by the resin, add processing aids and lubricants, and continue to mix until the material temperature rises to 90 °C. Observe the dry and wet state of the powder. The best state is when it is dry and does not form a ball when held in the hand, then stop stirring. Finally, discharge the evenly mixed material into an 800L low-speed mixer with jacketed circulating water cooling, control the rotation speed at 80 rpm, and continue to mix until it is discharged to the storage bin at 35 °C.

[0194] Plasticization and filtration of plasticized PVC: Control the temperature of the internal mixer at 150 °C, add the mixed plasticized PVC powder material to the internal mixer for melting and plasticization, and the blending time of the internal mixer is 4 min; the blended material in the internal mixer is transported to the two-roll mill for further plasticization, control the roll speed of the two-roll mill at 50 r / min, and the temperature of the two-roll mill is 165 °C; the filter screen of the filter is a three-layer laminated metal filter screen, and the mesh numbers of its mesh holes are 20, 100, and 20 respectively. Control the temperature of the filter at 175 °C and the return water temperature of the machine body at 40 °C to prevent the material temperature from being too high and the melt strength from being too large, resulting in excessive frictional heating and early degradation of PVC.

[0195] Film calendering and forming: The material filtered by the filter rubber machine is conveyed along the conveyor belt to the calender main machine, and after calendering into a film, guiding away, embossing, cooling and winding, a plasticized PVC transparent film is obtained; the film forming parameters of the four-roll calender are: the temperature of the 1# roll is controlled at 180 °C and the speed is 10 m / min, the temperature of the 2# roll is controlled at 180 °C and the speed is 15 m / min, the temperature of the 3# roll is controlled at 185 °C and the speed is 20 m / min, the temperature of the 4# roll is controlled at 150 °C and the speed is 20 m / min; the parameters for guiding away and embossing are: 1 guiding wheel in the first stage, with a temperature controlled at 150 °C and a speed of 30 m / min; 2 guiding wheels in the second stage, with a temperature controlled at 150 °C and a speed of 30 m / min; 2 guiding wheels in the third stage, at 150 °C and a speed of 40 m / min; the parameters for cooling and winding are: the temperature of the cooling roll is controlled at 50 °C and the speed is 40 m / min, and the winding speed is 45 m / min.

[0196] After testing, its performance is shown in Table 3 and Table 4.

[0197] Table 1 Summary of the electrical properties and plasticizer water extraction properties of the films prepared in Examples 1 to 10

[0198]

[0199] A: Represents the mass change rate when placed in air for different times; W: Represents the mass change rate when immersed in water for different times.

[0200] Table 2 Summary of the mechanical properties, transparency and elastic properties of the films prepared in Examples 1 to 10

[0201]

[0202] Table 3 Summary of the mechanical properties, transparency and elastic properties of the films prepared in Comparative Examples 1 to 10

[0203]

[0204] Table 4 Summary of the electrical properties and plasticizer water extraction properties of the films prepared in Comparative Examples 1 to 10

[0205]

[0206] A: Represents the mass change rate when placed in air for different times; W: Represents the mass change rate when immersed in water for different times.

Claims

1. A high-strength antistatic plasticized polyvinyl chloride transparent film, characterized in that: Made of the following raw materials in the following mass ratio: 100 parts of polyvinyl chloride resin, 30-45 parts of antistatic plasticizer, 10-25 parts of non-antistatic and non-cold-resistant plasticizer, 10-15 parts of cold-resistant plasticizer, 2.0-3.5 parts of ionic liquid polymer, 1.0-1.5 parts of liquid composite heat stabilizer, 0.5-1.5 parts of processing aid, and 0.3-0.5 parts of lubricant.

2. The high-strength antistatic plasticized polyvinyl chloride transparent film according to claim 1, characterized in that: The polyvinyl chloride resin is a linear high-polymerization polyvinyl chloride resin synthesized by a suspension polymerization process and having a K value of 82±2.

3. The high-strength antistatic plasticized polyvinyl chloride transparent film according to claim 1, characterized in that: The antistatic plasticizer is one or a combination of dibutyl diglycerol adipate and dibutyl diglycerol glutarate; the non-antistatic and non-cold-resistant plasticizer is a phthalate plasticizer that meets the requirements of the EU RoHS Directive; and the cold-resistant plasticizer is an aliphatic dibasic acid ester compound that meets the requirements of the EU RoHS Directive.

4. The high-strength antistatic plasticized polyvinyl chloride transparent film according to claim 3, characterized in that: The phthalate plasticizer is one of diisononyl phthalate, diisodecyl phthalate or di(2-propylheptyl)phthalate or a combination thereof; the aliphatic dibasic acid ester compound is one of dioctyl azelate, dioctyl sebacate and dioctyl adipate or a combination thereof.

5. The high-strength antistatic plasticized polyvinyl chloride transparent film according to claim 1, characterized in that: The ionic liquid polymer is an alkyl salt antistatic agent that is not humidity-dependent.

6. The high-strength antistatic plasticized polyvinyl chloride transparent film according to claim 1, characterized in that: The liquid heat stabilizer is a PVC resin heat stabilizer that meets the requirements of the EU RoHS directive.

7. The high-strength antistatic plasticized polyvinyl chloride transparent film according to claim 1, characterized in that: The lubricant has a relative density of 0.845 to 0.890 g / cm 3 , kinematic viscosity at 100℃ is 15~25mm 2 / s, acid value ≤0.01mgKOH / g, initial distillation point above 350℃, and average relative molecular mass ≥600, low acid value and high viscosity liquid paraffin oil.

8. A method for preparing a high-strength antistatic plasticized polyvinyl chloride transparent film according to any one of claims 1 to 7, characterized in that: The following steps are involved: Premixing of plasticizer and ionic liquid polymer: antistatic plasticizer, non-antistatic non-cold-resistant plasticizer and cold-resistant plasticizer are automatically metered according to the formula ratio and added into a reactor with stirring and jacket water heating, stirring speed is controlled at 50-60 rpm, stirring time is 5-10 min, then the metered ionic liquid polymer is added, and the mixture is kept warm for 15-20 min until the temperature reaches 65±5° C., and then the plasticizer / ionic liquid mixture is obtained for standby use; High-speed mixing of plasticized PVC powder: put polyvinyl chloride resin and liquid composite stabilizer into a hot-mix high-speed mixer, start the low-speed mixing mode first, control the speed to 300-400rpm, and mix for 1-2min; add half of the pre-mixed and preheated plasticizer / ionic liquid mixture and switch to the high-speed mixing mode for uniform mixing, control the speed to 650-900rpm, and mix for 2-3min; when the temperature rises to 50-60°C, continue to add the remaining plasticizer / ionic liquid mixture; when all the plasticizers are completely absorbed by the resin, add liquid paraffin oil lubricant and continue to mix evenly until the material temperature rises to 80-90°C, and stop stirring when the material is dry; finally, discharge the uniformly mixed material into a low-speed mixer with jacketed circulating water cooling, control the speed to 60-100rpm, continue mixing until 40±5°C, and discharge the material into the storage bin to obtain the mixed powder; Plasticizing and filtering of plasticized PVC: Add the mixed powder into the twin-screw planetary extruder for plasticizing and mixing. The barrel temperature is controlled at 160-180°C. The powder is initially plasticized into a spiral chain-like material, and then conveyed to the open mill by the conveyor belt for further plasticization. The temperature of the open mill is controlled at 140-170°C. Due to the high content of plasticizer in the film formula, the open mill turns the material every 5-10 minutes to ensure uniform plasticization of the material. The material uniformly plasticized by the open mill further enters the rubber filter to filter impurities. The barrel temperature of the rubber filter is controlled at 160-180°C. The filter screen of the discharge die head is a three-layer combined filter screen. The filter screen specification is a three-layer stainless steel mesh with a mesh size of 20 / 150 / 20. Film calendering and cooling: The material filtered by the rubber filter is conveyed to the calendering machine along the conveyor belt, and is subjected to four-roller calendering, constant temperature water tank cooling, roller cooling, winding and storage cooling processes to obtain a high-strength antistatic plasticized polyvinyl chloride transparent film.

9. The method for preparing a high-strength antistatic plasticized polyvinyl chloride transparent film according to claim 8, characterized in that: In the film calendering and cooling steps, the four-roller calendering process parameters are: 1# roller temperature is controlled at 170-180°C and speed is 5-15m / min, 2# roller temperature is controlled at 175-185°C and speed is 10-30m / min, 3# roller temperature is controlled at 175-185°C and speed is 20-40m / min, 4# roller temperature is controlled at 140-160°C and speed is 25-40m / min; the constant temperature water tank cooling process parameters are: the high-temperature film peeled off by the calendering machine No. 4 roller immediately enters a constant temperature water tank with a length of 1.5-2.0 meters and a water temperature of 34-36°C for rapid cooling; the film passes through the bottom of the constant temperature cooling water tank, and the cooling water tank is designed with a surface water outlet to remove oil and clean water and a continuous water replenishment control device; the The roller cooling process parameters are as follows: the film after rapid cooling in the constant temperature water tank is drawn out, and directly enters the cooling roller section composed of multiple rollers through the embossed smooth roller for further cooling; in view of the special requirement of high transparency of the film after water, the cooling roller section needs to perform insulation cooling treatment on the film, including controlling the cooling roller speed to 40-50m / min, keeping the water temperature of the cooling roller section at 60-80℃, and wrapping the cooling roller group with gauze; the winding and storage cooling process parameters are as follows: the film is sent to the winding section after insulation cooling by the cooling roller group, and is pressurized and wound by the winder, with a winding speed of 45-55m / min; the internal temperature of the film just wound is between 50 and 60℃, and in order to ensure the high transparency of the film, it needs to be transferred to a cold storage at 15-20℃ for storage in time until it cools to room temperature.

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