An anti-aging, heat-resistant PVC plastic

Abstract

This invention relates to the field of polyvinyl chloride (PVC) technology and discloses an anti-aging, heat-resistant PVC plastic. 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 PVC. Furthermore, the triazine ring and the high-carbon-content triphenylbenzene structure form a triazine-based charring agent, significantly improving the residual mass of PVC and enhancing its heat resistance. The hyperbranched polyamide-lanthanum complex polymer has a high lanthanum content lanthanum complex structure, which can react with hydrogen chloride produced by the thermal decomposition of PVC, preventing hydrogen chloride from degrading PVC and improving its aging resistance.

Description

Technical Field

[0001] This invention relates to the field of polyvinyl chloride technology, specifically to an anti-aging, heat-resistant PVC plastic. Background Technology

[0002] PVC (polyvinyl chloride) is a plastic material with excellent comprehensive performance, widely used in footwear, cables, building materials, foam materials, packaging films, etc. However, PVC has poor thermal stability. At high temperatures, it decomposes to produce free radicals and hydrogen chloride, which can lead to oxidative decomposition and aging of PVC, affecting its mechanical properties. Adding heat stabilizers and anti-aging agents to PVC can effectively improve its aging resistance and other properties.

[0003] Lanthanum and other rare earth stabilizers are a novel type of stabilizer. The lanthanum element in these stabilizers can react with hydrogen chloride, thereby inhibiting the thermal decomposition of polyvinyl chloride (PVC) and improving its thermal stability and anti-aging properties. Hyperbranched polymers possess a three-dimensional branched structure and numerous terminal chemical functional groups, exhibiting unique physicochemical properties such as low viscosity. They can be used as coordination polymers, toughening agents, flame retardants, and charring agents, showing broad application prospects in materials such as PVC and polypropylene. Summary of the Invention

[0004] The technical problem solved by this invention is to provide an anti-aging, heat-resistant PVC plastic, thereby solving the problem of poor heat resistance and aging resistance of PVC materials.

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

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

[0007] The method for preparing the anti-aging, heat-resistant PVC plastic is as follows:

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

[0009] S2: Add polyvinyl chloride, plasticizer, hyperbranched polyamide-lanthanum complex polymer, and lubricant to a high-speed mixer and knead at 50-70℃ for 3-6 minutes; then plasticize the mixture in an open mill at 175-190℃ for 10-15 minutes; finally, place the material in a flat vulcanizing machine for hot pressing at 175-190℃ for 20-30 minutes to obtain heat-resistant PVC plastic with anti-aging properties.

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

[0011] Furthermore, the reaction temperature in S1 is 60-90℃, and the reaction time is 12-36h.

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

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

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

[0015] S2. Under ice bath conditions, N,N-dimethylformamide, CBZ-lysine-diaminotriazine, 1,3,5-tris(4-acylchlorophenyl)benzene, and pyridine were added to a flask. The mixture was stirred and mixed, and after the reaction was cooled, a precipitate was formed. The precipitate was filtered, washed with ethanol, and then added to an acetic acid solution of hydrobromic acid. The mixture was stirred and reacted for 3-5 hours. Sodium carbonate was added for neutralization, and the mixture was filtered, washed with water, and dried to obtain hyperbranched polyamide.

[0016] Furthermore, 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.

[0017] Furthermore, the reaction temperature in S3 is 75-90℃, and the reaction time is 12-18h.

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

[0019] Furthermore, the reaction temperature in S4 is 35-50℃, and the reaction time is 12-24h.

[0020] The technical effects of this invention are:

[0021] This invention uses benzyloxycarbonyl-L-lysine and 2-chloro-4,6-diamino-1,3,5-triazine as raw materials to prepare CBZ-lysine-based diaminotriazine, which is then subjected to hyperbranching polymerization with 1,3,5-tris(4-acylchlorophenyl)benzene under pyridine catalysis. Finally, the CBZ protecting group is removed in a hydrobromic acid / acetic acid system to obtain a hyperbranched polyamide containing amino acid structure and melamine structure.

[0022] The amino acid structure and melamine nitrogen atoms in hyperbranched polyamides can form stable polydentate coordination with lanthanum ions. Furthermore, hyperbranched polyamides contain a three-dimensional branched network structure with a larger number of coordination sites, resulting in hyperbranched polyamide-lanthanum complex polymers with high lanthanum content. When used to modify polyvinyl chloride (PVC), the hyperbranched polyamide-lanthanum complex polymers, containing a three-dimensional hyperbranched structure, form a physically cross-linked network within PVC, resulting in a uniformly dispersed and stable homogeneous system. This system can absorb and dissipate externally applied energy, thereby improving the impact strength of PVC.

[0023] Hyperbranched polyamide-lanthanum complex polymers contain heat-resistant triazine rings and rigid triphenylbenzene structures, which can increase the initial decomposition temperature of polyvinyl chloride (PVC). Furthermore, the triazine rings and the high-carbon-content triphenylbenzene structures form triazine char-forming agents, which significantly improve the mass surplus of PVC and enhance its heat resistance.

[0024] Hyperbranched polyamide-lanthanum complex polymers have a high lanthanum content lanthanum complex structure, which can react with hydrogen chloride produced by the thermal decomposition of polyvinyl chloride (PVC), thus preventing hydrogen chloride from degrading PVC and improving the aging resistance of PVC. Detailed Implementation

[0025] The technical solutions will now be clearly and completely described in conjunction with embodiments of the present invention. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within 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 give 1,3,5-tris(4-acylchlorophenyl)benzene. Reaction formula:

[0027]

[0028] Example 1

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

[0030]

[0031] Under ice bath conditions, N,N-dimethylformamide, 150 mmol of CBZ-lysine-diaminotriazine, 100 mmol of 1,3,5-tris(4-acylchlorophenyl)benzene, and 170 mmol of pyridine were added to a flask. The mixture was stirred and reacted at 35 °C for 24 h. After cooling, a precipitate formed, which was filtered, washed with ethanol, and the product was added to a 30% (w / w) hydrobromic acid-acetic acid solution. The mixture was stirred and reacted for 5 h. Sodium carbonate was added for neutralization, and the product was filtered, washed with water, and dried to obtain hyperbranched polyamide. Reaction mechanism:

[0032]

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

[0034] 1000g of polyvinyl chloride, 100g of plasticizer dioctyl phthalate, 10g of hyperbranched polyamide-lanthanum complex polymer, and 15g of lubricant polyethylene wax were added to a high-speed mixer and kneaded at 60°C for 6 minutes. The mixture was then plasticized in an open mill at 190°C for 10 minutes. Finally, the material was placed in a flat vulcanizing machine and hot-pressed at 175°C for 25 minutes to obtain heat-resistant PVC plastic with anti-aging properties.

[0035] Example 2

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

[0037] Under ice bath conditions, N,N-dimethylformamide, 150 mmol of CBZ-lysine-diaminotriazine, 100 mmol of 1,3,5-tris(4-acylchlorophenyl)benzene, and 160 mmol of pyridine were added to a flask. The mixture was stirred and reacted at 50 °C for 18 h. After cooling, a precipitate was formed, filtered, washed with ethanol, and the product was added to a 30% (w / w) hydrobromic acid-acetic acid solution. The mixture was stirred and reacted for 5 h. Sodium carbonate was added for neutralization, and the mixture was filtered, washed with water, and dried to obtain hyperbranched polyamide.

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

[0039] 1000g of polyvinyl chloride, 100g of plasticizer dioctyl phthalate, 40g of hyperbranched polyamide-lanthanum complex polymer, and 15g of lubricant polyethylene wax were added to a high-speed mixer and kneaded at 60°C for 3 minutes. The mixture was then plasticized at 180°C for 10 minutes in an open mill. Finally, the material was placed in a flat vulcanizing machine and hot-pressed at 175°C for 30 minutes to obtain heat-resistant PVC plastic with anti-aging properties.

[0040] Example 3

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

[0042] Under ice bath conditions, N,N-dimethylformamide, 160 mmol of CBZ-lysine-diaminotriazine, 100 mmol of 1,3,5-tris(4-acylchlorophenyl)benzene, and 200 mmol of pyridine were added to a flask. The mixture was stirred and reacted at 35 °C for 18 h. After cooling, a precipitate was formed, filtered, washed with ethanol, and the product was added to a 30% (w / w) hydrobromic acid-acetic acid solution. The mixture was stirred and reacted for 4 h. Sodium carbonate was added for neutralization, and the mixture was filtered, washed with water, and dried to obtain hyperbranched polyamide.

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

[0044] 1000g of polyvinyl chloride, 100g of plasticizer dioctyl phthalate, 80g of hyperbranched polyamide-lanthanum complex polymer, and 15g of lubricant polyethylene wax were added to a high-speed mixer and kneaded at 70°C for 3 minutes. The mixture was then plasticized at 180°C for 10 minutes in an open mill. Finally, the material was placed in a flat vulcanizing machine and hot-pressed at 190°C for 20 minutes to obtain heat-resistant PVC plastic with anti-aging properties.

[0045] Example 4

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

[0047] Under ice bath conditions, N,N-dimethylformamide, 180 mmol of CBZ-lysine-diaminotriazine, 100 mmol of 1,3,5-tris(4-acylchlorophenyl)benzene, and 220 mmol of pyridine were added to a flask. The mixture was stirred and reacted at 35 °C for 24 h. After cooling, a precipitate was formed, filtered, washed with ethanol, and the product was added to a 30% (w / w) hydrobromic acid-acetic acid solution. The mixture was stirred and reacted for 4 h. Sodium carbonate was added for neutralization, and the mixture was filtered, washed with water, and dried to obtain hyperbranched polyamide.

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

[0049] 1000g of polyvinyl chloride, 100g of plasticizer dioctyl phthalate, 110g of hyperbranched polyamide-lanthanum complex polymer, and 15g of lubricant polyethylene wax were added to a high-speed mixer and kneaded at 70°C for 3 minutes. The mixture was then plasticized at 180°C for 15 minutes in an open mill. Finally, the material was placed in a flat vulcanizing machine and hot-pressed at 180°C for 30 minutes to obtain heat-resistant PVC plastic with anti-aging properties.

[0050] Example 5

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

[0052] Under ice bath conditions, N,N-dimethylformamide, 150 mmol of CBZ-lysine-diaminotriazine, 100 mmol of 1,3,5-tris(4-acylchlorophenyl)benzene, and 180 mmol of pyridine were added to a flask. The mixture was stirred and reacted at 50 °C for 12 h. After cooling, a precipitate was formed, filtered, washed with ethanol, and the product was added to a 30% (w / w) hydrobromic acid-acetic acid solution. The mixture was stirred and reacted for 5 h. Sodium carbonate was added for neutralization, and the mixture was filtered, washed with water, and dried to obtain hyperbranched polyamide.

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

[0054] 1000g of polyvinyl chloride, 100g of plasticizer dioctyl phthalate, 150g of hyperbranched polyamide-lanthanum complex polymer, and 15g of lubricant polyethylene wax were added to a high-speed mixer and kneaded at 70°C for 3 minutes. The mixture was then plasticized at 180°C for 10 minutes in an open mill. Finally, the material was placed in a flat vulcanizing machine and hot-pressed at 190°C for 20 minutes to obtain heat-resistant PVC plastic with anti-aging properties.

[0055] The notched impact strength of PVC material was tested using a cantilever beam impact strength tester, with a specimen size of 80mm × 10mm × 4mm. The test method followed GB / T 1043.2-2008 standard.

[0056] The PVC material was subjected to accelerated aging in an accelerated hot air aging test chamber at 100℃ for 120 hours. The notched impact strength was then tested after aging.

[0057]

[0058]

[0059] The thermal properties of PVC materials were tested using a thermogravimetric analyzer under a nitrogen atmosphere at temperatures ranging from 25 to 800°C.

[0060] Initial decomposition temperature (°C) Residual mass percentage (%) 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 which the mass fraction is 10%, and the mass surplus rate is the mass surplus rate at a temperature of 800℃.

[0062] In Examples 1-5, the amount of hyperbranched polyamide-lanthanum complex polymer gradually increased, the mass surplus rate became larger and larger, and the initial decomposition temperature also increased significantly.

[0063] The difference between Comparative Example 1 and Example 1 is that hyperbranched polyamide-lanthanum complex polymer is not added; only hyperbranched polyamide is added (prepared using the same method as in Example 1).

[0064] 1000g of polyvinyl chloride, 100g of plasticizer dioctyl phthalate, 10g of hyperbranched polyamide, and 15g of lubricant polyethylene wax were added to a high-speed mixer and kneaded at 60°C for 6 minutes. The mixture was then plasticized in an open mill at 190°C for 10 minutes. Finally, the material was placed in a flat vulcanizing machine and hot-pressed at 175°C for 25 minutes to obtain PVC plastic.

[0065] The difference between Comparative Example 2 and Example 1 is that hyperbranched polyamide-lanthanum complex polymer was not added, only lanthanum trichloride was added.

[0066] 1000g of polyvinyl chloride, 100g of plasticizer dioctyl phthalate, 10g of lanthanum trichloride, and 15g of lubricant polyethylene wax were added to a high-speed mixer and kneaded at 60°C for 6 minutes. The mixture was then plasticized in an open mill at 190°C for 10 minutes. Finally, the material was placed in a flat vulcanizing machine and hot-pressed at 175°C for 25 minutes to obtain PVC plastic.

[0067]

[0068] Compared with Example 1, Comparative Example 1 only added hyperbranched polyamide, which had good notched impact strength before aging, but the notched impact strength decreased significantly after aging.

[0069] Comparative Example 2, which only added lanthanum trichloride, exhibited poor compatibility with polyvinyl chloride (PVC), affecting the notched impact strength of PVC and resulting in a significant decrease in notched impact strength after aging. This is because the hyperbranched polyamide-lanthanum complex polymer contains a three-dimensional hyperbranched structure, forming a physical cross-linked network within PVC. This uniform dispersion creates a stable homogeneous system that can absorb and dissipate externally applied energy, thereby improving the impact strength of PVC. Furthermore, the presence of a lanthanum complex structure allows it to react with hydrogen chloride produced during the thermal decomposition of PVC, preventing hydrogen chloride from degrading PVC and improving its aging resistance. Consequently, the decrease in impact strength of PVC after aging tests was smaller.

[0070] Initial decomposition temperature (°C) Residual mass percentage (%) Example 1 278.0 12.0 Comparative Example 1 272.1 10.5 Comparative Example 2 259.2 9.6

[0071] Compared to Example 1, Comparative Example 1, which only added hyperbranched polyamide and did not contain a lanthanum complex structure, showed poor initial decomposition temperature and heat resistance of PVC. Comparative Example 2, which only added lanthanum chloride, exhibited the worst heat resistance of PVC. 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 PVC. Furthermore, the triazine ring and the high-carbon-content triphenylbenzene structure form a triazine charring agent, significantly increasing the residual mass of PVC and enhancing its heat resistance.

[0072] The static thermal stability of PVC was tested using the Congo red test: hyperbranched polyamide-lanthanum complex polymer and polyvinyl chloride were mixed and ground evenly in a weight ratio of (0-15):100, respectively, and placed in a test tube. The mixture was heated to 180°C, and a moistened Congo red test paper was placed 2 cm above the ground and mixed sample. The time it took for the Congo red test paper to change color was recorded. The longer the time, the better the thermal stability.

[0073]

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

[0075] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. An anti-aging, heat-resistant PVC plastic, characterized in that, The anti-aging, heat-resistant PVC plastic comprises the following components in the indicated weight proportions: 100% polyvinyl chloride, 5-30% plasticizer, 1-15% hyperbranched polyamide-lanthanum complex polymer, and 1-2% lubricant. The method for preparing the anti-aging, heat-resistant PVC plastic is as follows: S1: Add hyperbranched polyamide and N,N-dimethylformamide to a flask, stir to disperse, add lanthanum chloride and water, stir to react, cool, filter, wash with water, and dry to obtain hyperbranched polyamide-lanthanum complex polymer; The structural formula of the hyperbranched polyamide is: S2: Add polyvinyl chloride, plasticizer, hyperbranched polyamide-lanthanum complex polymer, and lubricant to a high-speed mixer and knead at 50-70℃ for 3-6 minutes; then plasticize the mixture in an open mill at 175-190℃ for 10-15 minutes; finally, place the material in a flat vulcanizing machine for hot pressing at 175-190℃ for 20-30 minutes to obtain heat-resistant PVC plastic with anti-aging properties.

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 in S1 is carried out at a temperature of 60-90℃ for a time of 12-36 hours.

4. The anti-aging heat-resistant PVC plastic according to claim 1, characterized in that, The mass ratio of 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 as follows: S3. Add water, benzyloxycarbonyl-L-lysine, and 2-chloro-4,6-diamino-1,3,5-triazine to the flask, stir and mix, add sodium hydroxide aqueous solution, cool after reaction, add hydrochloric acid for neutralization, precipitate, filter, wash with water to obtain CBZ-lysine-diaminotriazine. S4. Under ice bath conditions, add N,N-dimethylformamide, CBZ-lysine-diaminotriazine, 1,3,5-tris(4-acylchlorophenyl)benzene, and pyridine to 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 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 in S3 is carried out at a temperature of 75-90℃ for 12-18 hours.

8. The anti-aging heat-resistant PVC plastic according to claim 5, characterized in that, The molar ratio of CBZ-lysine-diaminotriazine, 1,3,5-tris(4-acylchlorophenyl)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℃, and the reaction time is 12-24h.

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