Anti-aging heat-resistant PVC (polyvinyl chloride) plastic

Abstract

The invention relates to the technical field of polyvinyl chloride, and discloses an anti-aging heat-resistant PVC plastic, a hyperbranched polyamide-lanthanum complex polymer contains a heat-resistant triazine ring and a rigid triphenylbenzene structure, the initial decomposition temperature of polyvinyl chloride can be increased, the triazine ring and the high-carbon-content triphenylbenzene structure form a triazine carbon-forming agent, and the aging resistance of polyvinyl chloride is improved. The mass residual rate of the polyvinyl chloride is obviously improved, and the heat resistance of the polyvinyl chloride is enhanced. The hyperbranched polyamide-lanthanum complex polymer has a lanthanum complex structure with high lanthanum content, and can react with hydrogen chloride generated by thermal decomposition of polyvinyl chloride, so that the polyvinyl chloride is prevented from being degraded by the hydrogen chloride, and the aging resistance of the polyvinyl chloride is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of polyvinyl chloride, and particularly to an anti-aging heat-resistant PVC plastic. Background Art

[0002] PVC (polyvinyl chloride) is a plastic material with excellent comprehensive properties and is widely used in shoe materials, cables, building materials, foaming materials, packaging films, etc.; however, polyvinyl chloride has poor thermal stability and thermally decomposes to generate free radicals and hydrogen chloride at high temperatures, which will cause oxidative decomposition and aging of polyvinyl chloride and affect the mechanical properties of polyvinyl chloride materials; adding heat stabilizers, anti-aging agents, etc. to polyvinyl chloride can effectively improve the anti-aging and other properties of polyvinyl chloride.

[0003] Rare earth stabilizers such as lanthanum are a new type of stabilizer, and the lanthanum element therein can react with hydrogen chloride, thereby inhibiting the thermal decomposition phenomenon of polyvinyl chloride and improving the thermal stability, anti-aging and other properties of polyvinyl chloride. Hyperbranched polymers have a three-dimensional branched structure and a large number of terminal chemical functional groups, and have unique physical and chemical properties such as low viscosity, and can be used as coordination polymers, toughening agents, flame retardants, char-forming agents, etc., and have broad application prospects in materials such as polyvinyl chloride and polypropylene. Summary of the Invention

[0004] The technical problem solved by the present invention is: to provide an anti-aging heat-resistant PVC plastic, which solves the problem of poor heat resistance and anti-aging performance of PVC materials.

[0005] The technical solution provided by the present invention is:

[0006] An anti-aging heat-resistant PVC plastic, characterized in that the wear-resistant and anti-aging PVC material comprises the following components in weight ratio: 100% polyvinyl chloride, 5-30% plasticizer, 1-15% hyperbranched polyamide-lanthanum coordination polymer, 1-2% lubricant;

[0007] The preparation method of the anti-aging heat-resistant PVC plastic is as follows:

[0008] S1: Add hyperbranched polyamide and N,N-dimethylformamide to a flask, stir and disperse, add lanthanum chloride and water, stir and react, cool, filter, wash with water, and dry to obtain a hyperbranched polyamide-lanthanum coordination polymer.

[0009] S2: Add polyvinyl chloride, plasticizer, hyperbranched polyamide-lanthanum complex polymer, and lubricant into a high-speed mixer for kneading at 50 - 70 °C for 3 - 6 min; then plastify the mixed material on an open mill at 175 - 190 °C for 10 - 15 min; finally, place the material in a flat vulcanizing machine for hot pressing at 175 - 190 °C for 20 - 30 min to obtain anti-aging heat-resistant PVC plastic.

[0010] Further, in S1, the volume ratio of N,N-dimethylformamide to water is 100:20 - 60.

[0011] Further, in S1, the reaction temperature is 60 - 90 °C and the time is 12 - 36 h.

[0012] Further, in S1, the mass ratio of hyperbranched polyamide to lanthanum chloride is 100:15 - 40.

[0013] Further, the preparation method of hyperbranched polyamide is as follows:

[0014] S3: Add water, carbobenzoxy-L-lysine, and 2-chloro-4,6-diamino-1,3,5-triazine into a flask, stir and mix, add sodium hydroxide aqueous solution, cool after reaction, add hydrochloric acid for neutralization and precipitation, filter, wash with water to obtain CBZ-lysine-based diaminotriazine.

[0015] S2: Under ice bath, add N,N-dimethylformamide, CBZ-lysine-based diaminotriazine, 1,3,5-tris(4-acylchlorophenyl)benzene, and pyridine into a flask, stir and mix, cool after reaction, precipitate, filter, wash with ethanol, then add the product into an acetic acid solution of hydrobromic acid, stir and react for 3 - 5 h, add sodium carbonate for neutralization, filter, wash with water, and dry to obtain hyperbranched polyamide.

[0016] Further, in S3, the molar ratio of carbobenzoxy-L-lysine, 2-chloro-4,6-diamino-1,3,5-triazine, and sodium hydroxide is 1:1 - 1.3:1.8 - 2.4.

[0017] Further, in S3, the reaction temperature is 75 - 90 °C and the time is 12 - 18 h.

[0018] Further, in S4, the molar ratio of CBZ-lysine-based diaminotriazine, 1,3,5-tris(4-acylchlorophenyl)benzene, and pyridine is 1.5 - 1.8:1:1.6 - 2.2.

[0019] Further, in S4, the reaction temperature is 35 - 50 °C and the time is 12 - 24 h.

[0020] The technical effects produced by the present invention are:

[0021] The present invention uses carbobenzoxy-L-lysine and 2-chloro-4,6-diamino-1,3,5-triazine as raw materials to prepare CBZ-lysine-based diaminotriazine. Then, under the catalysis of pyridine, it undergoes a hyperbranched polymerization reaction with 1,3,5-tris(4-acyl chlorophenyl)benzene. Finally, in the hydrobromic acid / acetic acid system, the CBZ protecting group is removed to obtain a hyperbranched polyamide containing amino acid structures and melamine structures.

[0022] In the hyperbranched polyamide, the amino acid structure and the nitrogen atoms of melamine can form stable multidentate coordination with lanthanum ions. Moreover, the hyperbranched polyamide contains a three-dimensional branched network structure with more coordination sites, thereby obtaining a hyperbranched polyamide-lanthanum complex polymer with a high lanthanum content. For the filling modification of polyvinyl chloride, the hyperbranched polyamide-lanthanum complex polymer contains a three-dimensional hyperbranched structure, forms a physical crosslinking network in polyvinyl chloride, is uniformly dispersed to form a stable homogeneous system, and can absorb and dissipate the energy applied from the outside, thereby improving the impact strength of polyvinyl chloride.

[0023] The hyperbranched polyamide-lanthanum complex polymer contains a heat-resistant triazine ring and a rigid triphenylbenzene structure, which can increase the initial decomposition temperature of polyvinyl chloride. Moreover, the triazine ring and the triphenylbenzene structure with a high carbon content form a triazine-based charring agent, significantly increasing the mass residue rate of polyvinyl chloride and enhancing the heat resistance of polyvinyl chloride.

[0024] The hyperbranched polyamide-lanthanum complex polymer has a lanthanum complex structure with a high lanthanum content, which can react with hydrogen chloride generated by the thermal decomposition of polyvinyl chloride, prevent hydrogen chloride from degrading polyvinyl chloride, and improve the aging resistance of polyvinyl chloride. Specific Embodiments

[0025] The following will clearly and completely describe the technical solutions in combination with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0026] Add 30 mL of thionyl chloride and 0.6 g of 1,3,5-tris(4-carboxyphenyl)benzene to a flask, reflux at 75 °C for 12 h, concentrate to remove thionyl chloride, and obtain 1,3,5-tris(4-acyl chlorophenyl)benzene. Reaction formula:

[0027]

[0028] Example 1

[0029] Add 1000 mL of water, 200 mmol of carbobenzoxy-L-lysine, and 260 mmol of 2-chloro-4,6-diamino-1,3,5-triazine to a flask, stir and mix them, add an aqueous solution containing 50 mL of 480 mmol of sodium hydroxide, stir and react at 80 °C for 12 h, cool, add hydrochloric acid for neutralization, precipitate, filter, wash with water to obtain carbobenzoxy-lysine-based diaminotriazine. Reaction formula:

[0030]

[0031] Under an ice bath, add N,N-dimethylformamide, 150 mmol of carbobenzoxy-lysine-based diaminotriazine, 100 mmol of 1,3,5-tris(4-acylchlorophenyl)benzene, and 170 mmol of pyridine to a flask, stir and mix them, stir and react at 35 °C for 24 h, cool, precipitate, filter, wash with ethanol, then add the product to an acetic acid solution containing 30% by mass of hydrobromic acid, stir and react for 5 h, add sodium carbonate for neutralization, filter, wash with water, and dry to obtain hyperbranched polyamide. Reaction mechanism:

[0032]

[0033] Add 50 g of hyperbranched polyamide to 1000 mL of N,N-dimethylformamide, stir and disperse, add 7.5 g of lanthanum chloride and 150 mL of water, stir and react at 90 °C for 12 h, cool, filter, wash with water, and dry to obtain a hyperbranched polyamide-lanthanum complex polymer.

[0034] Add 1000 g of polyvinyl chloride, 100 g of plasticizer dioctyl phthalate, 10 g of hyperbranched polyamide-lanthanum complex polymer, and 15 g of lubricant polyethylene wax to a high-speed mixer, knead at 60 °C for 6 min; then place the mixed material on an open mill and plasticize at 190 °C for 10 min; finally, place the material in a flat vulcanizer and hot press at 175 °C for 25 min to obtain anti-aging heat-resistant PVC plastic.

[0035] Example 2

[0036] Add 600 mL of water, 200 mmol of carbobenzoxy-L-lysine, and 200 mmol of 2-chloro-4,6-diamino-1,3,5-triazine to a flask, stir and mix them, add an aqueous solution containing 50 mL of 360 mmol of sodium hydroxide, stir and react at 75 °C for 18 h, cool, add hydrochloric acid for neutralization, precipitate, filter, wash with water to obtain carbobenzoxy-lysine-based diaminotriazine.

[0037] Under an ice bath, add N,N-dimethylformamide, 150 mmol of CBZ-lysine-based diaminotriazine, 100 mmol of 1,3,5-tris(4-acylchlorophenyl)benzene, and 160 mmol of pyridine to a flask, stir and mix, stir and react at 50 °C for 18 h, then cool, precipitate, filter, wash with ethanol, and add the product to an acetic acid solution of hydrobromic acid with a mass fraction of 30%, stir and react for 5 h, add sodium carbonate for neutralization, filter, wash with water, and dry to obtain hyperbranched polyamide.

[0038] Add 50 g of hyperbranched polyamide to 1000 mL of N,N-dimethylformamide in a flask, stir and disperse, add 10 g of lanthanum chloride and 200 mL of water, stir and react at 60 °C for 36 h, cool, filter, wash with water, and dry to obtain a hyperbranched polyamide-lanthanum complex polymer.

[0039] Add 1000 g of polyvinyl chloride, 100 g of plasticizer dioctyl phthalate, 40 g of hyperbranched polyamide-lanthanum complex polymer, and 15 g of lubricant polyethylene wax to a high-speed mixer, knead at 60 °C for 3 min; then place the mixed material in an open mill and plasticize at 180 °C for 10 min; finally, place the material in a flat vulcanizer and hot press at 175 °C for 30 min to obtain anti-aging heat-resistant PVC plastic.

[0040] Example 3

[0041] Add 800 mL of water, 200 mmol of carbobenzoxy-L-lysine, and 220 mmol of 2-chloro-4,6-diamino-1,3,5-triazine to a flask, stir and mix, add an aqueous solution containing 50 mL of 400 mmol of sodium hydroxide, stir and react at 90 °C for 12 h, cool, add hydrochloric acid for neutralization, precipitate, filter, and wash with water to obtain CBZ-lysine-based diaminotriazine.

[0042] Under an ice bath, add N,N-dimethylformamide, 160 mmol of CBZ-lysine-based diaminotriazine, 100 mmol of 1,3,5-tris(4-acylchlorophenyl)benzene, and 200 mmol of pyridine to a flask, stir and mix, stir and react at 35 °C for 18 h, then cool, precipitate, filter, wash with ethanol, and add the product to an acetic acid solution of hydrobromic acid with a mass fraction of 30%, stir and react for 4 h, add sodium carbonate for neutralization, filter, wash with water, and dry to obtain hyperbranched polyamide.

[0043] Add 50 g of hyperbranched polyamide to 1000 mL of N,N-dimethylformamide in a flask, stir and disperse, add 13 g of lanthanum chloride and 250 mL of water, stir and react at 90 °C for 24 h, cool, filter, wash with water, and dry to obtain a hyperbranched polyamide-lanthanum complex polymer.

[0044] Add 1000 g of polyvinyl chloride, 100 g of plasticizer dioctyl phthalate, 80 g of hyperbranched polyamide-lanthanum complex polymer, and 15 g of lubricant polyethylene wax into a high-speed mixer, knead at 70 °C for 3 min; then place the mixed material in an open mill and plasticize at 180 °C for 10 min; finally, place the material in a flat vulcanizer and hot press at 190 °C for 20 min to obtain anti-aging heat-resistant PVC plastic.

[0045] Example 4

[0046] Add 600 mL of water, 200 mmol of carbobenzoxy-L-lysine, and 200 mmol of 2-chloro-4,6-diamino-1,3,5-triazine into a flask, stir and mix, add an aqueous solution containing 50 mL of 360 mmol of sodium hydroxide, stir and react at 80 °C for 18 h, cool, add hydrochloric acid for neutralization, precipitate, filter, wash with water to obtain CBZ-lysine-based diaminotriazine.

[0047] Under an ice bath, add N,N-dimethylformamide, 180 mmol of CBZ-lysine-based diaminotriazine, 100 mmol of 1,3,5-tris(4-acylchlorophenyl)benzene, and 220 mmol of pyridine into a flask, stir and mix, stir and react at 35 °C for 24 h, then cool, precipitate, filter, wash with ethanol, add the product into an acetic acid solution of 30% by mass hydrobromic acid, stir and react for 4 h, add sodium carbonate for neutralization, filter, wash with water, and dry to obtain hyperbranched polyamide.

[0048] Add 50 g of hyperbranched polyamide into 1000 mL of N,N-dimethylformamide, stir and disperse, add 16 g of lanthanum chloride and 300 mL of water, stir and react at 80 °C for 24 h, cool, filter, wash with water, and dry to obtain hyperbranched polyamide-lanthanum complex polymer.

[0049] Add 1000 g of polyvinyl chloride, 100 g of plasticizer dioctyl phthalate, 110 g of hyperbranched polyamide-lanthanum complex polymer, and 15 g of lubricant polyethylene wax into a high-speed mixer, knead at 70 °C for 3 min; then place the mixed material in an open mill and plasticize at 180 °C for 15 min; finally, place the material in a flat vulcanizer and hot press at 180 °C for 30 min to obtain anti-aging heat-resistant PVC plastic.

[0050] Example 5

[0051] Add 800 mL of water, 200 mmol of carbobenzoxy-L-lysine, and 220 mmol of 2-chloro-4,6-diamino-1,3,5-triazine to a flask, stir and mix. Add an aqueous solution containing 400 mmol of sodium hydroxide in 50 mL, stir and react at 80 °C for 12 h. Cool, add hydrochloric acid for neutralization to precipitate, filter, and wash with water to obtain carbobenzoxy-lysine-based diaminotriazine.

[0052] Under an ice bath, add N,N-dimethylformamide, 150 mmol of carbobenzoxy-lysine-based diaminotriazine, 100 mmol of 1,3,5-tris(4-acylchlorophenyl)benzene, and 180 mmol of pyridine to a flask, stir and mix. Stir and react at 50 °C for 12 h, then cool to precipitate. Filter, wash with ethanol, and add the product to an acetic acid solution containing 30% by mass of hydrobromic acid. Stir and react for 5 h, add sodium carbonate for neutralization, filter, wash with water, and dry to obtain hyperbranched polyamide.

[0053] Add 50 g of hyperbranched polyamide to 1000 mL of N,N-dimethylformamide in a flask, stir and disperse. Add 20 g of lanthanum chloride and 400 mL of water, stir and react at 90 °C for 24 h. Cool, filter, wash with water, and dry to obtain a hyperbranched polyamide-lanthanum complex polymer.

[0054] Add 1000 g of polyvinyl chloride, 100 g of plasticizer dioctyl phthalate, 150 g of hyperbranched polyamide-lanthanum complex polymer, and 15 g of lubricant polyethylene wax to a high-speed mixer, knead at 70 °C for 3 min; then plastify the mixed material on an open mill at 180 °C for 10 min; finally, place the material in a flat vulcanizing machine and hot press at 190 °C for 20 min to obtain anti-aging heat-resistant PVC plastic.

[0055] The notched impact strength of the PVC material is tested using a cantilever beam impact strength testing machine, and the specimen size is 80 mm × 10 mm × 4 mm. The test method refers to the GB / T 1043.2-2008 standard.

[0056] Place the PVC material in an accelerated hot air aging test chamber for accelerated aging at a temperature of 100 °C for 120 h. Test the notched impact strength after aging.

[0057]

[0058]

[0059] The thermal properties of the PVC material are tested using a thermogravimetric analyzer under a nitrogen atmosphere at a test temperature of 25 - 800 °C.

[0060] Initial decomposition temperature (°C) Mass residue rate (%) Example 1 278.0 12.0 Example 2 286.0 14.5 Example 3 289.2 17.5 Example 4 292.3 21.2 Example 5 290.1 24.3

[0061] The initial decomposition temperature is the temperature at a mass fraction of 10%, and the mass residue rate is the mass residue rate at a temperature of 800 °C.

[0062] In Examples 1-5, the dosage of the hyperbranched polyamide-lanthanum complex polymer gradually increases, the mass residue rate becomes larger and larger, and the initial decomposition temperature also increases significantly.

[0063] The difference between Comparative Example 1 and Example 1 is that no hyperbranched polyamide-lanthanum complex polymer is added, and only hyperbranched polyamide (prepared in the same way as in Example 1) is added.

[0064] 1000 g of polyvinyl chloride, 100 g of plasticizer dioctyl phthalate, 10 g of hyperbranched polyamide, and 15 g of lubricant polyethylene wax are added to a high-speed mixer and kneaded at 60 °C for 6 min; then the mixed material is plastisized at 190 °C for 10 min in an open mill; finally, the material is hot-pressed at 175 °C for 25 min in a flat vulcanizer to obtain PVC plastic.

[0065] The difference between Comparative Example 2 and Example 1 is that no hyperbranched polyamide-lanthanum complex polymer is added, and only lanthanum trichloride is added.

[0066] 1000 g of polyvinyl chloride, 100 g of plasticizer dioctyl phthalate, 10 g of lanthanum trichloride, and 15 g of lubricant polyethylene wax are added to a high-speed mixer and kneaded at 60 °C for 6 min; then the mixed material is plastisized at 190 °C for 10 min in an open mill; finally, the material is hot-pressed at 175 °C for 25 min in a flat vulcanizer to obtain PVC plastic.

[0067]

[0068] Compared with Example 1, in Comparative Example 1, only hyperbranched polyamide is added, and it has good notched impact strength before aging, but the decline in notched impact strength after aging is relatively large.

[0069] In Comparative Example 2, only lanthanum trichloride is added, and its compatibility with the polyvinyl chloride matrix is poor, which will affect the notched impact strength of polyvinyl chloride, and the decline in notched impact strength after aging is relatively large. This is because the hyperbranched polyamide-lanthanum complex polymer contains a three-dimensional hyperbranched structure, forms a physical crosslinking network in polyvinyl chloride, is uniformly dispersed to form a stable homogeneous system, can absorb and dissipate the energy applied from the outside, thereby improving the impact strength of polyvinyl chloride. And it contains a lanthanum complex structure, which can react with hydrogen chloride generated by the thermal decomposition of polyvinyl chloride, avoid the degradation of polyvinyl chloride by hydrogen chloride, improve the aging resistance of polyvinyl chloride, and the decline in the impact strength of polyvinyl chloride after the aging experiment is relatively small.

[0070] Initial decomposition temperature (°C) Mass residue rate (%) Example 1 278.0 12.0 Comparative Example 1 272.1 10.5 Comparative Example 2 259.2 9.6

[0071] Compared with Example 1, in Comparative Example 1, only hyperbranched polyamide was added, without a lanthanum complex structure, and the initial decomposition temperature and heat resistance of polyvinyl chloride were not good. In Comparative Example 2, only lanthanum chloride was added, and the heat resistance of polyvinyl chloride was the worst. This is because the hyperbranched polyamide-lanthanum complex polymer contains a heat-resistant triazine ring and a rigid triphenylbenzene structure, which can increase the initial decomposition temperature of polyvinyl chloride, and the triazine ring and the triphenylbenzene structure with a high carbon content form a triazine-based charring agent, significantly increasing the mass residue rate of polyvinyl chloride and enhancing the heat resistance of polyvinyl chloride.

[0072] The static thermal stability of PVC was tested by the Congo red experiment: The hyperbranched polyamide-lanthanum complex polymer and polyvinyl chloride were respectively mixed and ground evenly according to the weight ratio of (0-15):100, put into a test tube, heated to 180 °C, and a moist Congo red test paper was placed 2 cm above the ground mixed sample; record the time when the Congo red test paper changes color. The longer the time, the better the thermal stability.

[0073]

[0074] As the ratio of the hyperbranched polyamide-lanthanum complex polymer to polyvinyl chloride increases, the color change time of the Congo red test paper becomes longer. When the ratio is (1-15):100, the PVC material shows better thermal stability.

[0075] This specific embodiment is only an explanation of the present application, and it does not limit the present application. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs 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 anti-aging heat-resistant PVC plastic, characterized in that: The wear-resistant and aging-resistant PVC material comprises the following components in weight proportion: 100% polyvinyl chloride, 5-30% plasticizer, 1-15% hyperbranched polyamide-lanthanum complex polymer, and 1-2% lubricant; The preparation method of the anti-aging heat-resistant PVC plastic is: S1: adding hyperbranched polyamide and N,N-dimethylformamide into a flask, stirring and dispersing, adding lanthanum chloride and water, stirring and reacting, cooling, filtering, washing with water, and drying to obtain a hyperbranched polyamide-lanthanum complex polymer; S2: Add polyvinyl chloride, plasticizer, hyperbranched polyamide-lanthanum complex polymer and lubricant into a high-speed mixer and knead at 50-70°C for 3-6 minutes; then plasticize the mixture in an open mill at 175-190°C for 10-15 minutes; finally, place the material in a flat vulcanizer for hot pressing at 175-190°C for 20-30 minutes to obtain anti-aging and heat-resistant PVC plastic.

2. The anti-aging heat-resistant PVC plastic according to claim 1, characterized in that: The volume ratio of N,N-dimethylformamide to water in S1 is 100:20-60.

3. The anti-aging heat-resistant PVC plastic according to claim 1, characterized in that: The reaction temperature in S1 is 60-90°C and the reaction time is 12-36h.

4. The anti-aging heat-resistant PVC plastic according to claim 1, characterized in that: The mass ratio of the hyperbranched polyamide to lanthanum chloride in S1 is 100:15-40.

5. The anti-aging heat-resistant PVC plastic according to claim 4, characterized in that: The preparation method of the hyperbranched polyamide is: S3, add water, benzyloxycarbonyl-L-lysine, and 2-chloro-4,6-diamino-1,3,5-triazine to a flask, stir and mix, add sodium hydroxide aqueous solution, cool after reaction, add hydrochloric acid to neutralize, precipitate, filter, and wash with water to obtain CBZ-lysine diamino-s-triazine; S2. In an ice bath, add N,N-dimethylformamide, CBZ-lysine diamino-s-triazine, 1,3,5-tri(4-chlorophenyl)benzene and pyridine into a flask, stir and mix, cool after reaction, precipitate, filter, wash with ethanol, add the product to an acetic acid solution of hydrobromic acid, stir and react for 3-5 hours, add sodium carbonate for neutralization, filter, wash with water and dry to obtain a hyperbranched polyamide.

6. The anti-aging heat-resistant PVC plastic according to claim 5, characterized in that: The molar ratio of benzyloxycarbonyl-L-lysine, 2-chloro-4,6-diamino-1,3,5-triazine and sodium hydroxide in S3 is 1:1-1.3:1.8-2.

4.

7. The anti-aging heat-resistant PVC plastic according to claim 5, characterized in that: The reaction temperature in S3 is 75-90°C and the reaction time is 12-18h.

8. The anti-aging heat-resistant PVC plastic according to claim 5, characterized in that: The molar ratio of CBZ-lysine diamino-s-triazine, 1,3,5-tri(4-chlorophenyl)benzene and pyridine in S4 is 1.5-1.8:1:1.6-2.

2.

9. The anti-aging heat-resistant PVC plastic according to claim 5, characterized in that: The reaction temperature in S4 is 35-50°C and the reaction time is 12-24h.

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