An auxiliary package production line and its process for the production of rigid PVC products

Abstract

This application relates to the field of plastic additives, and specifically discloses an additive package production line and its process for the production of rigid PVC products. An additive package production line for the production of rigid PVC products includes a processing and modifying particle production process; among them, the processing and modifying particle production process includes a latex particle preparation step and a processing and modifying particle preparation step. The latex particles are polymerized using hydroxyl-terminated polybutadiene, styrene, and fluorinated acrylate as raw materials; the processing and modifying particles are polymerized using latex particles and vinyl chloride as raw materials. The additive package formed by blending the processing and modifying particles with additives is added to polyvinyl chloride, which can significantly improve the processing performance and mechanical properties of polyvinyl chloride.

Description

Technical Field

[0001] The present application relates to the technical field of plastic additives, and more specifically, it relates to an additive package production line and its process for the production of rigid PVC products. Background Art

[0002] Polyvinyl chloride (PVC) has excellent comprehensive properties. As one of the five major general-purpose plastics, it is widely used in the fields of building materials, light industry, agriculture and sideline industries, etc. PVC usually adopts injection molding and extrusion processes to prepare various products. However, due to the structural characteristics of PVC itself, its decomposition temperature is very close to the plasticization temperature. Therefore, PVC is prone to decompose during the processing process, releasing hydrogen chloride, resulting in the yellowing of the product color and the decline of product performance.

[0003] In the related art, in order to reduce the processing difficulty of polyvinyl chloride, plasticizers are selected to be added to polyvinyl chloride. Plasticizers are mainly small-molecule substances, such as dibutyl phthalate, dioctyl phthalate, etc. The compatibility between small-molecule plasticizers and PVC is poor, and the addition amount is difficult to control. When the addition amount of the plasticizer is within the range of anti-plasticization concentration, it is easy to cause the decline of product performance instead.

[0004] Polymeric polyacrylate copolymers can also be selected as plasticizers. However, the composition of polyacrylate copolymers is complex, and different copolymerization compositions result in significant differences in the properties of polyacrylate copolymers, thus causing the addition amount and processing temperature of polyacrylate copolymers to have significant effects on the processing performance of PVC. When the addition amount of polyacrylate copolymer is low, the improvement of PVC processing performance is limited; while when the addition amount of polyacrylate copolymer is too high, it is easy to cause PVC melt fracture, which instead reduces the quality of the product.

[0005] In view of the above situation, there is an urgent need in the art to develop an additive that can significantly improve the processing performance of PVC materials, so that it can significantly improve the processing performance of PVC while also improving the performance of PVC products. Summary of the Invention

[0006] The present application provides an additive package production line and its process for the production of rigid PVC products, and this additive can fully improve the processing performance of PVC materials.

[0007] In a first aspect, an additive package production line for the production of rigid PVC products provided by the present application adopts the following technical solutions:

[0008] An additive package production line for the production of rigid PVC products includes a processing and modifying particle production process;

[0009] Among them, the processing and modifying particle production process includes the following steps:

[0010] Preparation of latex particles: Water, pH regulator I, emulsifier, initiator I, hydroxyl-terminated polybutadiene, styrene, fluorinated acrylate and crosslinking agent were mixed evenly and polymerized under an inert atmosphere to obtain latex particles; among them, the weight ratio of hydroxyl-terminated polybutadiene, styrene and fluorinated acrylate was (12-28):(25-37):(35-63);

[0011] Preparation of processed modified microparticles: The obtained latex particles, water, pH regulator II, dispersant II and initiator II were blended, and after being under an inert atmosphere and evacuated, vinyl chloride monomer was added for polymerization to obtain processed modified microparticles; among them, the weight ratio of vinyl chloride monomer to fluorinated acrylate was (26.8-34.2):(35-63).

[0012] By adopting the above technical solution, the processed modification aid enables hydroxyl-terminated polybutadiene, styrene and fluorinated acrylate to polymerize first to form latex particles through double bond addition reaction; then, polyvinyl chloride chain segments are grafted outside the latex particles through addition reaction, so that adding the processed modification aid to polyvinyl chloride can significantly improve the processing performance and mechanical properties of polyvinyl chloride. The principle is as follows:

[0013] The processed modified microparticles contain a large number of polar functional groups such as ester bonds, hydroxyl groups, fluorine and chlorine, which can generate induced dipole moment interaction with the polar chlorine element in polyvinyl chloride, increasing the interaction force between the processed modified microparticles and the polyvinyl chloride molecular chain; in addition, the processed modified microparticles are granular and have many branched chains, which can weaken the interaction force between polyvinyl chlorides, promote the movement of polyvinyl chloride molecular chains, and keep the melt viscosity of polyvinyl chloride within a moderate range, thus being beneficial to the low-temperature plasticization of polyvinyl chloride; secondly, the polyvinyl chloride chain segments contained in the processed modified microparticles enable the processed modified microparticles and polyvinyl chloride to have good compatibility and are more likely to be inserted and distributed in the middle of polyvinyl chloride. While achieving a significant plasticizing effect, it can also accelerate the melting and plasticization of polyvinyl chloride. Moreover, the flexible alkyl chain segments and rigid benzene ring chain segments contained in the processed modified microparticles can adjust the mechanical properties of polyvinyl chloride.

[0014] Furthermore, a carbon-fluorine bond is introduced into the processed modified microparticles, and the strong shielding effect of the carbon-fluorine bond can reduce the breakage of ester bonds, thereby further effectively improving the heat resistance of the processed modified microparticles, making them not easily break and degrade at high temperatures and having long-term processing performance.

[0015] At the same time, due to the presence of active functional groups such as hydroxyl groups in the processed modified microparticles, during the processing, polyvinyl chloride with partial degradation generates polyene chain segments, which can be connected to the processed modification aid, making the overall polyvinyl chloride have better stability.

[0016] In summary, the use of the special processing and modifying particles in this application can reduce the processing difficulty of polyvinyl chloride, improve the processing performance of polyvinyl chloride, enabling its melting and plasticization in a short time; moreover, the processed product has excellent mechanical properties.

[0017] Preferably, the weight ratio of the hydroxyl-terminated polybutadiene, styrene, and fluorinated acrylate is (20 - 24):(30 - 32):(44 - 50).

[0018] Preferably, the weight ratio of the vinyl chloride monomer and the fluorinated acrylate is (30 - 32):(44 - 50).

[0019] By adopting the above technical solutions, the addition amounts of the hydroxyl-terminated polybutadiene, styrene, fluorinated acrylate, and vinyl chloride monomer are adjusted. Under the same addition amounts, due to the adjustment of the chain segment structure, the processing performance and comprehensive service performance of polyvinyl chloride can be further optimized.

[0020] Preferably, the polymerization temperature of the latex particles is 60 - 80 °C, and the polymerization time is 30 - 60 min.

[0021] Preferably, the polymerization temperature of the processing and modifying particles is 60 - 80 °C, and the polymerization time is 30 - 45 min.

[0022] Preferably, the particle size of the processing and modifying particles is 5 - 50 μm.

[0023] By adopting the above technical solutions, optimizing the polymerization temperature and polymerization time can, on the one hand, reduce the possibility of the occurrence of explosive polymerization and improve the production efficiency of the processing and modifying particles. On the other hand, it can control the size of the processing and modifying particles within a moderate range, further enhancing the dispersion performance of the processing and modifying particles in polyvinyl chloride. When the processing and modifying particles are added to polyvinyl chloride, stress concentration points are not easily formed, and the impact resistance of polyvinyl chloride is improved.

[0024] Preferably, the fluorinated acrylate is one or more of perfluoroalkyl ethyl methacrylate, 2-(perfluorobutyl)ethyl methacrylate, and 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate. More preferably, the fluorinated acrylate is 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate.

[0025] By adopting the above technical solutions, the fluorinated acrylate includes but is not limited to 2-(perfluorododecyl)ethyl acrylate, 2-(perfluorobutyl)ethyl acrylate, perfluoroalkyl ethyl methacrylate, etc.; compared with 2-(perfluorododecyl)ethyl acrylate, 2-(perfluorobutyl)ethyl acrylate, perfluoroalkyl ethyl methacrylate, 2-(perfluorobutyl)ethyl methacrylate, the fluorine chain length of 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate is moderate, and its influence on the grafting rate of hydroxyl-terminated polybutadiene and styrene is small, which is beneficial to further improve the processing performance and mechanical properties of polyvinyl chloride.

[0026] Optionally, the additive package further includes an additive, and the additive is zinc oxide.

[0027] By adopting the above technical solutions, the additives include but are not limited to ultraviolet absorbers, heat stabilizers, lubricants, etc. The ultraviolet absorber is added to polyvinyl chloride together with the processing modified particles, which can effectively improve the anti-yellowing performance of polyvinyl chloride products and further improve the comprehensive use performance of polyvinyl chloride. Zinc oxide can play a certain role in reflecting ultraviolet light and can better improve the anti-yellowing performance of the processing modified additives. At the same time, the surface of zinc oxide contains active functional groups such as hydroxyl groups, and through the action of polar bonds such as hydrogen bonds, it has good compatibility with the processing modified particles, so its dispersibility in polyvinyl chloride is better, and the stress concentration points in polyvinyl chloride can be reduced. In addition, zinc oxide and the processing modified particles play a synergistic effect in improving the processing performance of polyvinyl chloride.

[0028] Preferably, the weight ratio of zinc oxide to the processing modified particles is 1:(9-10).

[0029] By adopting the above technical solutions, optimizing the addition amount of zinc oxide can achieve a balance between improving the plasticization performance and mechanical properties of polyvinyl chloride, so that both the plasticization performance and mechanical properties of polyvinyl chloride can be further improved.

[0030] In a second aspect, the present application provides an additive package production process for the production of PVC hard products, adopting the following technical solutions:

[0031] An additive package production process for the production of PVC hard products includes the following steps:

[0032] (1) Production of processing modified particles;

[0033] (2) Screening of the particle size of the processing modified particles;

[0034] (3) Blending of the processing modified particles and the additive.

[0035] By adopting the above technical solutions, the use of processing aids in polyvinyl chloride can significantly improve the processing performance and obtain excellent mechanical properties, especially the notch impact strength, and excellent yellowing resistance.

[0036] In summary, the present application has at least the following beneficial effects:

[0037] In the present application, hydroxyl-terminated polybutadiene, styrene, and fluorinated acrylate are crosslinked through double bonds to form latex particles, and then a layer of polyvinyl chloride is coated on the outer layer of the latex particles, so that the processing modified microparticles can have good compatibility during the processing of polyvinyl chloride and be fully dispersed in polyvinyl chloride. Since the processing modified microparticles contain a large number of polar functional groups such as ester bonds, hydroxyl groups, fluorine, and chlorine, an induced dipole moment interaction can be generated with the polar chlorine element in polyvinyl chloride, and by weakening the intermolecular force, the processing performance of polyvinyl chloride is improved, and good low-temperature plasticization performance is achieved. At the same time, the flexible alkyl chain segments and rigid benzene ring chain segments contained in the processing modified microparticles can adjust the mechanical properties of polyvinyl chloride, so that polyvinyl chloride can have excellent mechanical properties while having good processing performance. Detailed implementation mode

[0038] In the related art, the processing aids used for polyvinyl chloride are generally small molecule plasticizers. However, the compatibility between small molecule plasticizers and polyvinyl chloride is poor, and the addition amount is difficult to control. In the range of the anti-plasticization concentration, when it is added to polyvinyl chloride, it cannot play a plasticizing effect, but instead will cause a decrease in the mechanical properties of polyvinyl chloride. When the addition amount of the high molecular weight plasticizer polyacrylate is too high during use, the viscosity of polyvinyl chloride is too high, which easily leads to melt fracture of polyvinyl chloride.

[0039] In view of the above situation, the applicant studies the structure and molecular chain segments of the processing aids for polyvinyl chloride. The applicant finds that: using fluorinated acrylate, hydroxyl-terminated polybutadiene, and styrene as reaction raw materials, the resulting polymer contains a large number of polar functional groups such as ester bonds, hydroxyl groups, and fluorine, which can generate an induced dipole moment interaction with the polar chlorine element in polyvinyl chloride, increasing the force between the processing modified microparticles and the polyvinyl chloride molecular chain, reducing the force between polyvinyl chlorides, and being beneficial to the low-temperature plasticization of polyvinyl chloride; grafting polyvinyl chloride chain segments onto the polymer, the resulting processing modified microparticles have good compatibility with polyvinyl chloride and are more likely to be inserted and distributed into the middle of polyvinyl chloride. While achieving a significant plasticizing effect, it can also accelerate the melting and plasticization of polyvinyl chloride. Moreover, the flexible alkyl chain segments and rigid benzene ring chain segments contained in the processing modified microparticles can adjust the mechanical properties of polyvinyl chloride. Thus, the technical problem of the present application is successfully solved, that is, a new type of polyvinyl chloride processing aid is provided, so that polyvinyl chloride can have improved mechanical properties while having good processing performance.

[0040] In addition, the processing modified particles and the ultraviolet absorber in the additive are used together, which can effectively improve the anti-yellowing performance of the polyvinyl chloride product and further improve the comprehensive use performance of the polyvinyl chloride.

[0041] The present application will be further described in detail below with reference to examples, comparative examples and application examples.

[0042] Unless otherwise specified, the raw materials used in the examples and comparative examples of the present application are as follows.

[0043] Hydroxyl-terminated polybutadiene:

[0044] Type I: number average molecular weight 3.8×10 3 ~4.6×10 3 , hydroxyl value 0.48 mmol / g;

[0045] Type III: number average molecular weight 3.0×10 3 ~3.6×10 3 , hydroxyl value 0.70 mmol / g;

[0046] Type IV: number average molecular weight 2.7×10 3 ~3.0×10 3 , hydroxyl value 0.80 mmol / g.

[0047] Emulsifier

[0048] The selection of emulsifier one and emulsifier two includes but is not limited to fatty alcohol polyoxyethylene ether, sodium stearate, etc. In the present application, both emulsifier one and emulsifier two use ammonium alkylphenol polyoxyethylene ether sulfate CO436;

[0049] Initiator

[0050] The selection of initiator one and initiator two includes but is not limited to potassium persulfate, ammonium persulfate, sodium persulfate, sodium bisulfite; in the present application, initiator one is a compound of potassium persulfate and sodium bisulfite in a weight ratio of 1:1; in the present application, initiator two is a compound of sodium persulfate and sodium bisulfite in a weight ratio of 1:1;

[0051] The selection of crosslinking agent includes but is not limited to tert-butyl hydroperoxide. In the present application, tert-butyl hydroperoxide is selected;

[0052] pH regulator: The selection of pH regulator one and pH regulator two includes but is not limited to sodium dihydrogen phosphate, ammonium bicarbonate. In the present application, both pH regulator one and pH regulator two are ammonium bicarbonate.

[0053] Example

[0054] Example 1

[0055] An auxiliary agent package for the production of rigid PVC products is made according to the following steps:

[0056] (1) Production of processing modified microparticles

[0057] Preparation of latex particles:

[0058] S1. Add 1 kg of emulsifier 1, 0.06 kg of initiator 1 and 150 kg of deionized water to the pre-emulsification kettle in sequence and stir to dissolve; add polymerization raw materials to the pre-emulsification kettle, and the polymerization raw materials are 1.2 kg of hydroxyl-terminated polybutadiene type I, 2.5 kg of styrene, and 6.3 kg of 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate; after stirring and emulsifying for 20 min, obtain pre-emulsion 1.

[0059] S2. Fill the polymerization kettle with nitrogen for protection, add 0.01 kg of emulsifier 1, 2 kg of deionized water, 0.003 kg of pH regulator 1 and 0.001 kg of cross-linking agent tert-butyl hydroperoxide to the polymerization kettle in sequence, start stirring, and raise the temperature to 50 °C.

[0060] S3. Slowly add the pre-emulsion 1 obtained in step S1 to the polymerization kettle, control the dropping time within 2 - 3 h, after the dropping is completed, raise the temperature to 55 °C, keep the temperature for reaction for 3 h, and then cool down to 40 °C for discharging to obtain a latex particle emulsion.

[0061] S4. Demulsify, wash and dry the copolymer emulsion obtained above to obtain powdery latex particles.

[0062] Preparation of processing modified microparticles:

[0063] A1. Add 1 kg of emulsifier 2, 0.06 kg of initiator 2, 0.003 kg of pH regulator 2 and 150 kg of deionized water to the pre-emulsification kettle in sequence and stir to dissolve;

[0064] Add the latex particles obtained in step S4 to the pre-emulsification kettle and stir and emulsify for 20 min to obtain pre-emulsion 2.

[0065] A2. Replace the air in the reaction kettle with nitrogen and evacuate three times, the replacement pressure is -0.5 MPa, after the replacement is completed, add 2.68 kg of vinyl chloride monomer; increase the stirring speed and control the stirring speed at 500 rpm / min;

[0066] Add the pre-emulsion 2 to the reaction kettle through pressure from the top of the reaction kettle, raise the temperature to 55 °C, keep the temperature for reaction for 3 h, when the pressure in the kettle drops to 0.7 MPa, cool down and relieve the pressure to terminate the reaction, discharge the unreacted vinyl chloride, and after filtering, washing and drying the discharged material, obtain the processing modified microparticles.

[0067] (2) Particle size screening of processing modified microparticles

[0068] The processed and modified particles are screened, and particles with a particle size of 5 - 50 μm are selected;

[0069] (3) Blending of the processed and modified particles and the additive

[0070] Take 350 g of processed and modified particles with a particle size of 0.5 - 5 μm and blend them with 25 g of additive Basf1010 to prepare an auxiliary package for the production of rigid PVC products.

[0071] Examples 2 - 7

[0072] An auxiliary package for the production of rigid PVC products, which is different from Example 1 in that the composition of the processed and modified particles is different, as shown in Table 1 below:

[0073] Table 1. Composition of the modified processed particles

[0074] Composition / kg Example 1 Example 2 Example 3 Example 4 Hydroxyl-terminated polybutadiene (Type I) 1.2 2 2.4 2.8 Styrene 2.5 3 3.2 3.7 3-(Perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate 6.3 5 4.4 6.3 Vinyl chloride 2.68 2.68 2.68 2.68 Composition / kg Example 5 Example 6 Example 7 Hydroxyl-terminated polybutadiene (Type I) 2 2 2 Styrene 3 3 3 3-(Perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate 5 5 5 Vinyl chloride 3 3.2 3.5

[0075] Examples 8 - 10

[0076] An auxiliary package for the production of rigid PVC products, which is different from Example 5 in that the processing parameters of steps S4 and A2 are different. The specific processing parameters are as follows:

[0077] In Example 8, the temperature is raised to 60 °C in step S4 and kept at this temperature for 60 min; the temperature is raised to 60 °C in step A2 and kept at this temperature for 45 min;

[0078] In Example 9, the temperature is raised to 80 °C in step S4 and kept at this temperature for 30 min; the temperature is raised to 60 °C in step A2 and kept at this temperature for 30 min;

[0079] In Example 10, the temperature is raised to 85 °C in step S4 and kept at this temperature for 15 min; the temperature is raised to 85 °C in step A2 and kept at this temperature for 15 min.

[0080] Example 11

[0081] An auxiliary package for the production of rigid PVC products, which is different from Example 8 in that the types of fluorinated acrylate are different, specifically as follows;

[0082] In Example 11, 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate is replaced with 2-(perfluorododecyl)ethyl acrylate in equal weight;

[0083] In Example 12, 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate is replaced with 2-(perfluorobutyl)ethyl acrylate in equal weight.

[0084] Examples 13 - 14

[0085] An auxiliary agent package for the production of rigid PVC products, which is different from Example 8 in that the types of hydroxyl-terminated polybutadiene are different, specifically as follows;

[0086] In Example 13, type I hydroxyl-terminated polybutadiene was replaced with type III hydroxyl-terminated polybutadiene in equal weight;

[0087] In Example 14, type I hydroxyl-terminated polybutadiene was replaced with type IV hydroxyl-terminated polybutadiene in equal weight.

[0088] Examples 15 - 16

[0089] An auxiliary agent package for the production of rigid PVC products, which is different from Example 14 in that the particle size of the processing modified microparticles is different, specifically as follows:

[0090] In Example 15, the particle size of the processing modified microparticles is 100 - 300 μm;

[0091] In Example 16, the particle size of the processing modified microparticles is 0.1 - 5 μm.

[0092] Example 17

[0093] An auxiliary agent package for the production of rigid PVC products, which is different from Example 14 in that the additives are different. In this example, zinc oxide with a particle size of 0.1 - 0.5 μm was used to replace Basf1010 in equal weight.

[0094] Examples 18 - 20

[0095] An auxiliary agent package for the production of rigid PVC products, which is different from Example 17 in that the weights of zinc oxide and the processing modified microparticles are different, specifically as follows:

[0096] In Example 18, the dosage of the processing modified microparticles is 450 g, and the dosage of zinc oxide is 50 g;

[0097] In Example 19, the dosage of the processing modified microparticles is 500 g, and the dosage of zinc oxide is 50 g;

[0098] In Example 20, the dosage of the processing modified microparticles is 650 g, and the dosage of zinc oxide is 100 g.

[0099] Comparative example

[0100] Comparative examples 1 - 4

[0101] An auxiliary agent package for the production of rigid PVC products, which is different from Example 1 in that the composition of the processing modified microparticles is different, as shown in Table 2 below:

[0102] Table 2. Composition of the modified processing microparticles

[0103] Composition / kg Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Hydroxyl-terminated polybutadiene (Type I) 3.24 / 1.6 1.2 Styrene 6.76 2.84 / 2.5 3-(Perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate / 7.16 8.4 6.3 Vinyl chloride 2.68 2.68 2.68 /

[0104] For the performance detection test, the auxiliary agent packages prepared in Examples 1-20 and Comparative Examples 1-4 for the production of rigid PVC products were added to polyvinyl chloride. The type of polyvinyl chloride was SG-5, and the dosage of the auxiliary agent for PVC processing was 5 wt% of the weight of polyvinyl chloride SG-5. After melt blending and extrusion, test samples were obtained. Long strip samples of 1×10 cm were cut according to the standard and the following tests were carried out:

[0105] Mechanical properties: According to the standard of GB / T1843-2008, notched impact test specimens were cut with a universal specimen making machine and an impact resistance test was carried out using a cantilever beam impact testing machine (test temperature: 23 °C);

[0106] It was carried out according to the standard requirements of GB / T1040-2006, and the tensile speed was 20 mm / min (test temperature: 23 °C).

[0107] Yellowness value: Test samples with a thickness of 1 mm were taken and tested on a color difference index instrument. Five different parts were selected for each sample, and the average value of the five values was taken and its standard deviation was calculated. The irradiation dose of the test sample was 15 kGy.

[0108] Processing performance: Record the plasticizing time of the test sample;

[0109] The surface finish of the test sample was scored according to the grades of 1-5;

[0110] The evaluation of the scoring was as follows:

[0111] Grade 5: The surface of the PVC material is smooth and flat without pits;

[0112] Grade 4: The surface of the PVC material is relatively smooth and the pits are not obvious;

[0113] Grade 3: The smoothness of the surface of the PVC material is average and the pits are obvious;

[0114] Grade 2: The surface of the PVC material is relatively rough and the local pits are obvious;

[0115] Grade 1: The surface of the PVC material is extremely rough and the overall pits are uneven.

[0116] Test results

[0117] Table 4. Detection data of the usage effects of Examples 1-20 and Comparative Examples 1-4

[0118]

[0119]

[0120] In Examples 1-20, the melting and plasticizing temperature of the test sample was 150-165 °C, and the maximum torque was between 21.7-22.6 Nm; while in Comparative Examples 1-4, the melting and plasticizing temperature was 176-185 °C, and the maximum torque was between 24.6-27.8 Nm; it can be shown that: using the additive package of the present application can effectively improve the low-temperature processing performance of polyvinyl chloride.

[0121] Combining Example 1 and Comparative Examples 1-4 and combining with Table 4, it can be seen that: fluorinated acrylate was missing in Comparative Example 1, hydroxyl-terminated polybutadiene was missing in Comparative Example 2, styrene was missing in Comparative Example 3, and polyvinyl chloride was missing in Comparative Example 4, and the mechanical properties of all four were not good, the plasticizing time was long, and the plasticizing temperature was high. It can be seen that fluorinated acrylate, hydroxyl-terminated polybutadiene, styrene and vinyl chloride have a synergistic effect in improving the plasticizing performance and mechanical properties of polyvinyl chloride.

[0122] Combining Examples 14-16 and combining with Table 4, it can be seen that: the particle size of the processing modified particles has an impact on the processing performance of polyvinyl chloride, because the particle size affects the distribution of the processing modified particles in polyvinyl chloride, thus affecting the processing performance and mechanical properties of polyvinyl chloride.

[0123] Combining Examples 17-20 and combining with Table 4, it can be seen that: within a certain addition amount range of the processing modified particles, the processing performance and mechanical properties of polyvinyl chloride products can be significantly improved. The reason may be that when the addition amount of the processing modified particles increases within a certain range, the influence on the melt viscosity of polyvinyl chloride is small, and it is not easy to cause melt fracture of polyvinyl chloride, making the processing performance of polyvinyl chloride excellent.

[0124] This specific embodiment is only an explanation of the present application, and it is not a limitation of the present application. Those skilled in the art can make modifications without creative contributions to this embodiment after reading this specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. An auxiliary package production line for the production of rigid PVC products, characterized in that, It includes a production process for processed modified microparticles; Among them, the production process for processed modified microparticles includes the following steps: Preparation of latex particles: Mix water, pH regulator 1, emulsifier, initiator 1, hydroxyl-terminated polybutadiene, styrene, fluorinated acrylate, and crosslinking agent, and polymerize under an inert atmosphere to obtain latex particles; among them, the weight ratio of hydroxyl-terminated polybutadiene, styrene, and fluorinated acrylate is (12 - 28):(25 - 37):(35 - 63); Preparation of processed modified microparticles: Blend the obtained latex particles, water, pH regulator 2, dispersant 2, and initiator 2, and after evacuating under an inert atmosphere, add vinyl chloride monomer and polymerize to obtain processed modified microparticles; among them, the weight ratio of vinyl chloride monomer to fluorinated acrylate is (26.8 - 34.2):(35 - 63).

2. The auxiliary package production line for the production of rigid PVC products according to claim 1, characterized in that: The weight ratio of the hydroxyl-terminated polybutadiene, styrene, and fluorinated acrylate is (20 - 24):(30 - 32):(44 - 50).

3. The auxiliary package production line for the production of rigid PVC products according to claim 2, characterized in that: The weight ratio of the vinyl chloride monomer to the fluorinated acrylate is (30 - 32):(44 - 50).

4. The auxiliary package production line for the production of rigid PVC products according to claim 1, characterized in that: The polymerization temperature of the latex particles is 60 - 80 °C, and the polymerization time is 30 - 60 min.

5. The auxiliary package production line for the production of rigid PVC products according to claim 4, characterized in that: The polymerization temperature of the processed modified microparticles is 60 - 80 °C, and the polymerization time is 30 - 45 min.

6. The auxiliary package production line for the production of rigid PVC products according to claim 1, characterized in that: The particle size of the processed modified microparticles is 0.5 - 5 μm.

7. The auxiliary package production line for the production of rigid PVC products according to claim 6, characterized in that: The fluorinated acrylate is one or more of perfluoroalkyl ethyl methacrylate, 2-(perfluorobutyl)ethyl methacrylate, and 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate.

8. The auxiliary package production line for the production of rigid PVC products according to claim 1, characterized in that: The auxiliary package further includes an additive, and the additive is zinc oxide.

9. The auxiliary package production line for the production of rigid PVC products according to claim 8, characterized in that: The weight ratio of the zinc oxide to the processed modified microparticles is 1:(9 - 10).

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