Preparation system for printing antistatic polyester release film

Abstract

The utility model discloses a preparation system for printing an antistatic polyester release film. The preparation system comprises a double-screw extruder, wherein a raw material inlet of the double-screw extruder is respectively connected with a PET (Polyethylene Terephthalate) particle conveying tank and a composite additive preparation device; an outlet of the double-screw extruder is connected with the two-way stretcher; an outlet of the two-way stretcher is connected with the plasma processor; an outlet of the plasma processor is connected with the coating machine; an outlet of the coating machine is connected with the drying box, an outlet of the drying box is connected with the curing oven, and an outlet of the curing oven is connected with the winding machine. The preparation system disclosed by the utility model can efficiently complete the whole process from raw material treatment, film extrusion, two-way stretching, plasma treatment, release agent coating to curing, and solves the defect that a practical preparation system for printing the antistatic polyester release film is lacked in the prior art.

Description

Technical Field

[0001] The utility model relates to a preparation system for printing antistatic polyester release films. Background Art

[0002] Release films are widely used in the electronics, packaging, automotive, and pharmaceutical and medical industries. They are usually used as protective films, circuit board labels, decorative protective films, and adhesive layer protective films and transfer films in the manufacturing processes of various industries. Release films are usually composed of a base film and a release agent layer firmly bonded to the base film. In recent years, in emerging precision application fields such as electronics, it is sometimes necessary to print patterns or logos on the side of the base film away from the release agent layer for easy identification. When the finished release film is wound into a roll for packaging, the release agent layer will come into contact with the side printed with the pattern after winding. When used, the release agent layer needs to be able to be smoothly separated from the pattern side without any release agent residue, and at the same time, it is necessary to avoid adverse effects caused by static electricity during the peeling operation. Therefore, in practical applications, release films with both printing and anti-static functions need to consider the compatibility of the base film with the printing process (such as screen printing, inkjet printing, etc.) to ensure that the pattern is clear and wear-resistant. The release agent will not corrode or damage the printed layer. The release agent must have good adhesion to the base film and strong release properties after curing, ensuring no adhesive residue remains after peeling. It must also effectively prevent static electricity accumulation, prevent malfunctions or damage caused by static electricity, and avoid the adhesion of dust and particulate matter.

[0003] In the prior art, no product or application has been found that simultaneously addresses the printability and antistatic properties of release films, nor has any mention been found of the problems and solutions that require simultaneous consideration of the printing function, antistatic function, and release function.

[0004] In addition, the prior art does not have a practical preparation system for printing antistatic polyester release films. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a preparation system for printing antistatic polyester release film, so as to reduce or avoid the above-mentioned problems.

[0006] In order to solve the above technical problems, the utility model proposes a preparation system for printing antistatic polyester release film, including a twin-screw extruder, the raw material inlet of the twin-screw extruder is respectively connected to a PET particle conveying tank and a composite additive preparation device; the outlet of the twin-screw extruder is connected to a biaxial stretching machine; the outlet of the biaxial stretching machine is connected to a plasma treatment machine; the outlet of the plasma treatment machine is connected to a coating machine; the outlet of the coating machine is connected to a drying oven, the outlet of the drying oven is connected to a curing oven, and the outlet of the curing oven is connected to a winder.

[0007] Preferably, the composite additive preparation device includes an ultrasonic disperser, which is connected to a centrifuge through a pipeline, the outlet of the centrifuge is connected to a first dryer, the outlet of the first dryer is further connected to a stirred reactor, the outlet of the stirred reactor is connected to a second dryer, and the outlet of the second dryer is connected to the raw material inlet of a twin-screw extruder through a pipeline.

[0008] Preferably, the operating temperature of the stirred reactor is set at 40-60°C.

[0009] Preferably, the set operating temperature of the twin-screw extruder is 270-280°C.

[0010] Preferably, the set working temperature of the biaxial stretching machine is 80-120°C.

[0011] Preferably, the set working temperature of the plasma treatment machine is 50-70°C.

[0012] Preferably, the coating machine comprises a coating roller and a coating tank, and the coating tank is connected to the release agent delivery tank via a pipeline.

[0013] Preferably, the coating roller is arranged below the PET film, and the lower part is immersed in the release agent in the coating tank.

[0014] Preferably, the set working temperature of the drying oven is 80-120°C.

[0015] Preferably, the setting working temperature of the curing oven is 150-180° C., and the curing time is 2-5 minutes.

[0016] The preparation system of the utility model can efficiently complete the entire process from raw material processing, film extrusion, biaxial stretching, plasma treatment, release agent coating to curing, solving the deficiency of the existing technology in lacking a practical preparation system for printing antistatic polyester release film. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following drawings are only intended to illustrate and explain the present application, and are not intended to limit the scope of the present invention.

[0018] Figure 1 Shown is a schematic structural diagram of a preparation system for printing an antistatic polyester release film according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to have a clearer understanding of the technical features, purpose and effects of the present invention, the specific implementation of the present invention is now described with reference to the accompanying drawings, wherein the same components are marked with the same reference numerals.

[0020] In view of the fact that the existing technology does not have a release film product that has printing, antistatic and release functions at the same time, nor does it have a related preparation system, the utility model has developed a preparation system specifically for printing antistatic polyester release film. The system can efficiently complete the entire process from raw material processing, film extrusion, biaxial stretching, plasma treatment, release agent coating to curing.

[0021] like Figure 1 , which shows a structural schematic diagram of a preparation system for printing antistatic polyester release film according to a specific embodiment of the present invention.

[0022] The preparation system of the utility model is specially used for preparing a printed antistatic polyester release film, which is composed of a PET base film and a release agent layer firmly bonded to the PET base film, wherein the PET base film is formed by blending and melt-extruding PET particles added with composite additives and then stretching, and the release agent layer is formed by solidifying the release agent.

[0023] In a specific embodiment, in the release film prepared by the preparation system of the present invention, the composite additive consists of polyvinyl pyrrolidone (PVP), graphene oxide (GO), 3-aminopropyltriethoxysilane (APTES) and polyvinyl butyral (PVB).

[0024] In another specific embodiment, the weight proportions of the components in the composite additive are: 50-70 parts by weight of PVP, 10-20 parts by weight of graphene oxide, 5-10 parts by weight of APTES, and 10-15 parts by weight of PVB.

[0025] Among the above-mentioned composite additives, PVP has good electrical conductivity and good compatibility with PET materials. In addition, the conductive polymer is evenly distributed in PET, which can provide stable antistatic properties while maintaining the mechanical properties of the film. Graphene oxide has a high surface area and unique surface activity, which can be introduced to enhance the functionality of the antistatic agent. APTES can produce a large number of materials with active groups (such as amino, hydroxyl, carboxyl, etc.) during the subsequent plasma treatment of the PET base film, thereby enhancing the hydrophilicity and printing properties of the PET base film. PVB can improve the adhesion of ink on the PET surface and is suitable for high-quality printing.

[0026] By adding a composite additive to the PET base film, the conductive polymer PVP and graphene oxide work synergistically to ensure antistatic properties without negatively affecting the transparency and mechanical properties of the film. At the same time, in addition to synergistically conducting electricity with PVP, graphene oxide can also provide a slightly rough surface, which is conducive to the physical adsorption of ink. The surface of graphene oxide contains polar groups, and these groups can be further excited during the plasma treatment of the PET base film to generate more active groups such as hydroxyl and carboxyl groups, increasing the polarity of the PET surface and improving the ink adhesion. APTES can also generate active groups such as amino and carboxyl groups during plasma treatment, significantly improving the hydrophilicity of the PET film, thereby improving printing performance. The composite additive in the release film of the present application can not only provide stable antistatic properties when added internally, but also further enhance the printing performance and surface activity of the PET base film during the subsequent plasma treatment process, making it suitable for applications such as electronic product packaging and labels that have high requirements for static electricity and printing performance. In addition, the present application significantly improves the functionality of the release film at different process stages through the composite design of additives, and has a high industrial application prospect.

[0027] In a specific embodiment, in the release film prepared by the preparation system of the present invention, the release agent is composed of a mixture of polydimethylsiloxane-aminosiloxane copolymer, fluorosilicone resin, quaternary ammonium salt antistatic agent, isocyanate silane, butyl acetate and toluene. The release agent is selected from ingredients such as polydimethylsiloxane-aminosilicone copolymer, fluorosilicone resin, quaternary ammonium salt antistatic agent to prepare a high-performance release agent specifically for composite additive base film and plasma-treated surface, with excellent release effect, antistatic performance and compatibility with base film surface. This release agent is not only suitable for PET release film, but is also particularly adapted to plasma-treated substrates, improving surface bonding and overall stability.

[0028] In another specific embodiment, the weight proportions of the components in the release agent are: polydimethylsiloxane-aminosiloxane copolymer (DC-1107): 50-60 wt %, fluorosilicone resin (SIFEL 611): 15-20 wt %, quaternary ammonium salt antistatic agent (Varistat 3700): 7-9 wt %, isocyanate silane (Dynasylan 1189): 5-7 wt %, butyl acetate and toluene (3:1) mixed solvent: 23-25 ​​wt %.

[0029] In the release film prepared by the preparation system of the present utility model, described polydimethylsiloxane-aminosiloxane copolymer can be selected the DC-1107 of Dow Corning (Dow Corning) company, DC-1107 is amino-modified polydimethylsiloxane, possesses excellent release performance, simultaneously owing to containing amino functional group, can form better sticking force with the polar group on the PET surface after plasma treatment, improve the stability of release coating.Described fluorosilicone resin can be selected the SIFEL 611 of Shin-Etsu Chemical (Shin-Etsu Chemical), SIFEL 611 is fluorosilicone resin, possesses ultra-low surface energy and good chemical resistance and anti-pollution property, can significantly promote the durability and the antistatic property of release agent, keep excellent release effect simultaneously.Described quaternary ammonium salt type antistatic agent can be selected the Varistat3700 of Sabo company (SABO SpA), Varistat3700 quaternary ammonium salt type antistatic agent, can effectively reduce the surface resistance of coating, prevents static accumulation and dust absorption, is particularly useful for smooth release film surface. The isocyanate silane can be selected from Evonik's Dynasylan 1189, an isocyanate-functionalized silane that crosslinks with reactive groups on the substrate surface and in the release agent, enhancing adhesion between the coating and the substrate, particularly to plasma-treated PET surfaces. The butyl acetate and toluene mixture, with a mass ratio of butyl acetate to toluene of 3:1, exhibits excellent volatility, promoting uniform coating of the release agent on the PET surface and providing suitable coating viscosity and fluidity. Butyl acetate evaporates quickly and leaves no residue, while toluene facilitates uniform dispersion of the release agent.

[0030] The release film prepared by the preparation system of the present invention can be prepared by the following process.

[0031] Firstly, a composite additive was prepared using polyvinyl pyrrolidone (PVP), graphene oxide (GO), 3-aminopropyltriethoxysilane (APTES) and polyvinyl butyral (PVB).

[0032] The specific process for preparing the composite additive is as follows: First, graphene oxide is surface-modified with 3-aminopropyltriethoxysilane to introduce reactive groups such as amino groups onto the graphene oxide surface, enhancing its dispersibility in polymers and compatibility with other materials. For example, 10-20 parts by weight of graphene oxide powder can be added to anhydrous ethanol to form a GO suspension with a concentration of 1-2 wt%. The suspension is then treated with an ultrasonic disperser (ultrasonication time is 30-60 minutes) to ensure that the graphene oxide is fully dispersed and to prevent agglomeration. Then, 5-10 parts by weight of APTES is added to the graphene oxide suspension. The reaction is stirred at 40-60°C for 1-4 hours, allowing the APTES to react with polar groups such as carboxyl and hydroxyl groups on the graphene oxide surface to form silane bonds. The terminal amino groups of APTES modify the graphene oxide surface, providing more reactive groups. After the reaction is complete, the modified graphene oxide is separated from the solution by centrifuge and then washed multiple times with anhydrous ethanol to remove unreacted APTES. The washed graphene oxide is dried at 50-70°C to obtain surface-modified graphene oxide powder. Thereafter, the surface-modified graphene oxide powder is added to a PVP-PVB composite solution. For example, 50-70 parts by weight of PVP can be added to ethanol and stirred to dissolve to form a PVP solution with a concentration of 10-15wt%. 10-15 parts by weight of PVB are dissolved in toluene to form a PVB solution with a concentration of 10-15wt%. According to the formula ratio (PVP: 50-70%, PVB: 10-15%), the two solutions are mixed and stirred evenly to form a PVP-PVB composite solution. The surface-modified graphene oxide powder is added to the PVP-PVB composite solution. The PVP-PVB-modified graphene oxide is stirred in a stirred reactor for 30-60 minutes to ensure uniform dispersion of the graphene oxide in the solution and prevent agglomeration. Finally, the solvent in the dispersed mixture is evaporated and dried to obtain a solid composite additive powder. For example, drying can be performed in a vacuum drying oven at 50-70°C to ensure complete solvent evaporation and obtain the final composite additive.

[0033] The prepared composite additive is then blended with PET particles through a twin-screw extruder to produce a functional PET material that is antistatic and easy to print. The composite additive is added in an amount of 5-10% of the total mass. For example, the composite additive (containing PVP, PVB, and surface-modified graphene oxide) is uniformly mixed with the PET particles according to a formula ratio (5-10%).

[0034] Afterwards, a twin-screw extruder is used to perform melt extrusion at a temperature of 270-280°C to ensure that the composite additives are evenly dispersed in the PET matrix. The amount of composite additives added is 5-10% of the total mass. For example, the composite additives (containing PVP, PVB and surface-modified graphene oxide) are evenly mixed with PET particles according to the formula ratio (5-10%). The thick sheet extruded by the twin-screw extruder is prepared into a film through casting and biaxial stretching processes. Biaxial stretching can enhance the mechanical properties and surface smoothness of the film. And optimizing the surface structure of the film helps to improve the adhesion of the ink. At the same time, the stretching process can also promote the migration of antistatic agents to the surface of the film, thereby enhancing the antistatic effect.

[0035] The biaxially oriented film is then further plasma treated to increase the density of surface active groups and enhance ink adhesion. Plasma treatment excites the surface polar groups of the composite additives, generating a large number of active groups, further enhancing printability.

[0036] Then, the release agent is evenly coated on the surface of the plasma-treated PET base film, and the coating thickness is controlled at 1-3 μm. Among them, the preparation process of the release agent is specifically as follows: polydimethylsiloxane-aminosiloxane copolymer (DC-1107) and fluorosilicone resin (SIFEL 611) are added to a stirred reactor in proportion and stirred and mixed. A quaternary ammonium salt antistatic agent (Varistat 3700) is added and stirred evenly. The solvent (a mixture of butyl acetate and toluene) is slowly added and stirred until the system is uniform, and the viscosity is adjusted to 20-30 seconds (coating 4# cup). Finally, an isocyanate silane crosslinking agent ( 1189), and stirred until evenly distributed. The mixed release agent was filtered through a 200-mesh sieve to remove any insoluble particles. After filtration, vacuum degassing was performed to remove any bubbles remaining in the solution to prepare the release agent of the present application.

[0037] After coating, the film is dried in hot air at 80-120°C to ensure complete evaporation of the solvent. Curing is then carried out at 150-180°C for 2-5 minutes to ensure that the cross-linking reaction in the release agent occurs fully and form a stable coating.

[0038] Corresponding to the above preparation process, the present invention proposes Figure 1 The preparation system shown.

[0039] See also Figure 1The production system of the present invention includes a twin-screw extruder 100, the raw material inlet of which is connected to a PET pellet conveying tank 10 and a composite additive preparation device 20. The PET pellets and composite additive are blended in the twin-screw extruder 100 and then melt-extruded to form a thick sheet. The operating temperature of the twin-screw extruder 100 is set at 270-280°C.

[0040] As shown in the figure, the composite additive preparation device 20 includes an ultrasonic disperser 1, which is used to disperse graphene oxide (GO) powder in anhydrous ethanol to ensure its uniform distribution and prevent agglomeration. At the same time, the graphene oxide is surface-modified by adding 3-aminopropyltriethoxysilane (APTES) to the ultrasonic disperser 1 for mixing. The ultrasonic disperser 1 is connected to a centrifuge 2 via a pipeline, which is used to separate and clean the modified graphene oxide from the solution. The outlet of the centrifuge 2 is connected to a first dryer 3, which is used to dry the separated modified graphene oxide. The outlet of the first dryer 3 is further connected to a stirred reactor 4, which is used to dissolve polyvinyl pyrrolidone (PVP) and polyvinyl butyral (PVB) and mix them with the surface-modified graphene oxide (GO) obtained after modification with 3-aminopropyltriethoxysilane (APTES). The operating temperature of the stirred reactor 4 is set to 40-60°C.

[0041] The outlet of the stirred reactor 4 is connected to the second dryer 5, which is used to dry the composite additive mixed and prepared in the stirred reactor 4 into a powder. Finally, the outlet of the second dryer 5 is connected to the raw material inlet of the twin-screw extruder 100 through a pipeline, which is used to directly transport the dried composite additive to the twin-screw extruder 100.

[0042] The outlet of the twin-screw extruder 100 is connected to a biaxial stretching machine 200, which is used to form a film by biaxial stretching the thick sheet extruded by the twin-screw extruder 100. The set working temperature of the biaxial stretching machine 200 is 80-120°C.

[0043] The outlet of the biaxial stretching machine 200 is connected to a plasma treatment machine 300, which performs plasma treatment on the surface of the biaxially stretched film to stimulate surface active groups, enhance ink adhesion and antistatic properties. The operating temperature of the plasma treatment machine 300 is set at 50-70°C.

[0044] The outlet of the plasma treatment machine 300 is connected to the coating machine 400, which is used to evenly coat the release agent on the surface of the plasma-treated PET film to ensure that it has good release performance and antistatic ability.

[0045] Coating machine 400 includes a coating roller 41 and a coating tank 42, which is connected to the release agent delivery tank 30 via a pipe. In the illustrated embodiment, coating roller 41 is positioned below the PET film, with its lower portion immersed in the release agent in coating tank 42. Coating roller 41 rotates to apply the release agent to the PET film.

[0046] The outlet of the coating machine 400 is connected to the drying oven 500 , the outlet of the drying oven 500 is connected to the curing oven 600 , and the outlet of the curing oven 600 is connected to the winder 700 .

[0047] The PET film coated with the release agent by the coater 400 is further transported to the drying oven 500, then transported to the curing oven 600, and finally wound by the winder 700 to prepare the printed antistatic polyester release film of the present application.

[0048] The drying oven 500 is used for rapidly evaporating the solvent, and its operating temperature is set to 80-120°C.

[0049] The curing oven 600 is used to perform high-temperature curing on the coated film. The set working temperature is 150-180° C. and the curing time is 2-5 minutes.

[0050] The following table lists the weight parameters for preparing a PET base film, and measuring the performance parameters of the PET base film.

[0051] The names of some raw materials in the examples and subsequent comparative examples are represented by the following abbreviations or codes.

[0052] Graphene oxide: GO 3-aminopropyltriethoxysilane: APTES

[0053] Polyvinyl pyrrolidone: PVP Polyvinyl butyral: PVB

[0054]

[0055] Surface resistance was measured using ASTM D257. Surface tension was measured using ASTM D5946. Ink adhesion was measured using ISO 2409. Furthermore, when comparing adhesion after scrubbing using ASTM D2486, Examples 1-3 all demonstrated superior long-term stability in ink adhesion compared to Comparative Examples 1-4.

[0056] The surface resistances of Examples 1-3 are 2.0×108Ω / square, 1.0×109Ω / square, and 3.5×108Ω / square, respectively, showing excellent antistatic properties, which are significantly better than the resistance values ​​of Comparative Examples 1-4 (for example, Comparative Example 1 is 4.3×1012Ω / square).

[0057] In addition, after testing, the inks of Examples 1-3 can be completely dried within 3-5 seconds after printing without diffusion, and after a tape peeling test, the printed inks do not fall off.

[0058] In contrast, the inks of Comparative Examples 1-4 could not be completely dried within 3-5 seconds after printing. After the inks were completely dried, the printed inks all fell off after a tape peeling test.

[0059] In addition, when the plasma surface treatment step was omitted when preparing the base films of Examples 1-3, the surface resistance, surface tension and ink adhesion levels all decreased by about 20%-30%, indicating that the plasma surface treatment step is difficult to replace in the base film preparation process of this application.

[0060] The following table lists the weight percentages of the following release films to prepare release films, and measure the performance parameters of the release films.

[0061] The names of some raw materials in the examples and subsequent comparative examples are represented by the following abbreviations or codes.

[0062] Polydimethylsiloxane-Aminosiloxane Copolymer: A Fluorosilicone Resin: B

[0063] Quaternary ammonium salt antistatic agent: C Isocyanate silane: D

[0064] Butyl acetate and toluene (3:1) mixed solvent: E

[0065]

[0066] Release force was measured using ASTM D3330 (180-degree peel strength), and surface energy was measured using ASTM D2578. The release forces in Examples 4-6 were 0.06 N / 10 mm, 0.04 N / 10 mm, and 0.05 N / 10 mm, respectively, demonstrating excellent release performance. In contrast, the release forces in the comparative examples were as high as 0.3-0.5 N / 10 mm, indicating poor release performance.

[0067] Further testing showed that the inks of Examples 4-6 were printed on top of the release agent layer, and none of the printed inks were separated from the release agent layer. In contrast, the inks of Comparative Examples 5-7 were separated from the release agent layer.

[0068] In summary, through the analysis of the test data of the examples and comparative examples of the present application, the following conclusions can be obtained:

[0069] 1. Polyvinylpyrrolidone (PVP) has good electrical conductivity and compatibility with PET materials. Its main function is to provide stable antistatic properties and be evenly distributed in the PET material, thereby improving the overall performance of the material. The conductivity of PVP can effectively prevent the accumulation of static electricity. In Comparative Example 3, the absence of PVP resulted in a significant decrease in antistatic performance, with the surface resistance reaching 6.7×1011Ω / square, while the surface resistance in Example 2 was only 1.0×109Ω / square. This significant difference indicates that the absence of PVP makes it difficult to release static electricity, resulting in static electricity accumulation, which is very unfavorable for electrostatically sensitive fields such as electronic products.

[0070] While PVP's primary function is antistatic, it also indirectly affects ink adhesion. The uniform distribution of PVP within the PET film provides a better foundation for surface treatment, while its polarity also helps improve ink adhesion. The absence of PVP can lead to reduced ink adhesion on the surface. For example, the ink in Comparative Example 3 only has an adhesion of 3B, while the inks in the Examples all have an adhesion of 5B.

[0071] 2. The role of graphene oxide (GO) in this application is to provide antistatic properties, and to increase surface roughness through its high surface area and surface activity, thereby improving the physical adsorption of the ink. GO can synergize with PVP to provide a more efficient antistatic effect. The polar groups of GO (such as carboxyl, hydroxyl, etc.) can not only enhance the antistatic properties, but also excite more active groups after plasma treatment, thereby improving surface conductivity. In Comparative Example 1, GO is completely absent, resulting in a surface resistance increase of 4.3×1012Ω / square, which is much higher than the 2.0×108Ω / square in Example 1, indicating that the absence of GO significantly weakens the antistatic ability. In addition to providing antistatic function, GO's slightly rough surface structure also helps to improve the physical adsorption of the ink. The polar groups contained in GO help to interact with the polar components in the ink and improve the adhesion of the ink. In Comparative Example 1 lacking GO, the ink adhesion is only 2B. In contrast, the ink adhesion in Example 1 with a higher GO content is 5B, indicating the significant role of GO in improving the adhesion of the ink.

[0072] The main function of 3.3-aminopropyltriethoxysilane (APTES) is to introduce active groups, such as amino groups and carboxyl groups, during the plasma treatment of the PET base film, further enhancing the hydrophilicity and ink adhesion of the PET base film. Although the main function of APTES is not antistatic, it can introduce polar groups through plasma treatment to enhance surface conductivity. In Comparative Example 2, which lacks APTES, the surface resistance is 1.5×1012Ω / square, which is much higher than the 1.0×109Ω / square in Example 2, indicating that APTES plays an important role in improving the surface polarity and antistatic properties of the PET film. The large number of polar groups (such as amino groups and hydroxyl groups) generated by APTES after plasma treatment can significantly improve the adhesion of the ink. The lack of APTES will lead to a decrease in surface activity, resulting in insufficient adhesion of the ink. In Comparative Example 2, APTES is missing and the ink adhesion drops to 2B, which is significantly lower than the 5B in Example 2. This shows that APTES plays an important role in promoting the binding force between the ink and the PET surface.

[0073] 4. Polyvinyl butyral (PVB) is part of the composite additive, mainly to improve the adhesion of ink on the PET surface and increase the printability of the material. The polarity of PVB helps to form a strong bond between the ink and the base film surface. PVB does not directly affect the antistatic properties, but it works synergistically with other components (such as PVP and GO) to ensure the balance between the antistatic properties and ink adhesion of the material. PVB plays a key role in improving ink adhesion. In Comparative Example 4, the lack of PVB results in an ink adhesion of only 3B, while in Example 3 it is 5B. The polar groups of PVB can interact with the components in the ink, allowing the ink to adhere more firmly to the surface of the PET base film. The lack of PVB will significantly reduce the adhesion of the ink, resulting in easy shedding of the ink during the printing process.

[0074] 5. Quaternary ammonium salt antistatic agents are important components of release agents. They can reduce the surface resistance of the material, prevent static electricity accumulation, and reduce dust adsorption. In Comparative Example 5, the quaternary ammonium salt antistatic agent is missing, and the surface resistance is as high as 5.6×1011Ω / square, while the surface resistance in Example 4 is 3.3×108Ω / square. This shows that the absence of the antistatic agent in the release agent significantly reduces the antistatic properties of the material, leading to static electricity accumulation. Although the antistatic agent does not directly affect the adhesion of the ink, its absence leads to an increase in surface resistance. Static electricity accumulation may cause adverse effects on the ink during the printing process, such as ink diffusion or uneven printing.

[0075] In short, each component of the composite additive and release agent plays a significant role in antistatic performance and ink adhesion. The absence of any key component can lead to the following performance degradations: Lack of PVP, GO, or antistatic agents directly increases surface resistance, making the material susceptible to static electricity accumulation. This can cause electrostatic damage, particularly in sensitive applications such as electronics packaging. Lack of GO, PVB, or APTES significantly reduces ink adhesion, causing printed patterns to easily fall off or become unclear, making it impossible to meet the requirements of high-precision printing.

[0076] Therefore, the optimized design of the composite additives and release agent components is the key to ensuring that this application has excellent antistatic properties and ink adhesion.

[0077] Those skilled in the art should understand that although the present invention is described in terms of multiple embodiments, not each embodiment contains only one independent technical solution. This description is provided for clarity only. Those skilled in the art should understand the description as a whole and consider the technical solutions involved in each embodiment as being combinable into different embodiments to understand the scope of protection of the present invention.

[0078] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A preparation system for printing antistatic polyester release film, characterized in that: The preparation system includes a twin-screw extruder, the raw material inlet of the twin-screw extruder is respectively connected to a PET particle conveying tank and a composite additive preparation device; the outlet of the twin-screw extruder is connected to a biaxial stretching machine; the outlet of the biaxial stretching machine is connected to a plasma processor; the outlet of the plasma processor is connected to a coating machine; the outlet of the coating machine is connected to a drying oven, the outlet of the drying oven is connected to a curing oven, and the outlet of the curing oven is connected to a winder.

2. The preparation system according to claim 1, wherein: The composite additive preparation device includes an ultrasonic disperser, which is connected to a centrifuge through a pipeline, the outlet of the centrifuge is connected to a first dryer, the outlet of the first dryer is further connected to a stirred reactor, the outlet of the stirred reactor is connected to a second dryer, and the outlet of the second dryer is connected to a raw material inlet of a twin-screw extruder through a pipeline.

3. The preparation system according to claim 2, wherein: The operating temperature of the stirred reactor was set at 40-60°C.

4. The preparation system according to claim 1, wherein: The set operating temperature of the twin-screw extruder is 270-280°C.

5. The preparation system according to claim 1, wherein: The set working temperature of the biaxial stretching machine is 80-120℃.

6. The preparation system according to claim 1, wherein: The set working temperature of the plasma processor is 50-70℃.

7. The preparation system according to claim 1, wherein: The coating machine includes a coating roller and a coating tank, and the coating tank is connected to the release agent delivery tank through a pipeline.

8. The preparation system according to claim 7, wherein: The coating roller is arranged below the PET film, and its lower part is immersed in the release agent in the coating tank.

9. The preparation system according to claim 1, wherein: The set working temperature of the drying oven is 80-120℃.

10. The preparation system according to claim 1, wherein: The set working temperature of the curing oven is 150-180℃ and the curing time is 2-5 minutes.

Images