A wear-resistant and impact-resistant composite PVC material and its preparation method

Abstract

This invention discloses a wear-resistant and impact-resistant composite PVC material and its preparation method, belonging to the field of polymer materials technology. The invention comprises the following raw materials in parts by weight: 80-100 parts epoxy polyvinyl chloride, 10-15 parts plasticizer stabilizer, 10-12 parts impact modifier, 0.5-2 parts lubricant, 5-10 parts filler, 2-3 parts antioxidant, and 2-3 parts heat stabilizer. The method involves preparing a metal soap stabilizer, which absorbs pyrolysis gases while decomposing to produce metal chlorides, enhancing the flame retardant properties of the material and acting as a filler that diffuses uniformly within the material. The epoxy groups in the prepared modifier absorb hydrogen chloride while hybridizing the polyvinyl chloride segments, and the double bond structure reacts with pyrolysis free radicals to produce a cyclic structure, enhancing the material's impact resistance.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, specifically to a wear-resistant and impact-resistant composite PVC material and its preparation method. Background Technology

[0002] The initial method to improve the performance of composite PVC materials was to use toughening agents to improve the impact resistance of PVC, but its performance in terms of wear resistance was limited. However, with the rise of filler modification technology, especially the application of nano fillers, breakthroughs have been made in material performance.

[0003] In recent years, with the help of surface treatment technology and intelligent composite formulation, composite PVC materials have made continuous progress in high strength and multifunctionality. At present, this material has been widely used in industrial equipment housings, pipes, flooring, home decoration and other fields, promoting its development from single-function material to multifunctional composite material, and providing new solutions to meet the needs of modern industry and home.

[0004] The prior art CN118725483A discloses a wear-resistant and corrosion-resistant polyvinyl chloride (PVC) cable material, which significantly improves the wear resistance of the cable material by adding performance-enhancing fillers and reduces the frictional resistance of the cable during extrusion molding, making the cable less prone to breakage when subjected to external wear and extending its service life. However, some of the metal oxides added to the performance-enhancing material are not modified and are directly added to the material. During the high-temperature extrusion process, the hydrogen chloride gas generated can corrode the fillers, leading to a decrease in the wear resistance of the material. In addition, the polarity difference between the directly added metal oxides and PVC is large, resulting in weak interfacial bonding, and the impact resistance of the material needs to be further improved.

[0005] To address this technical deficiency, a solution is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a wear-resistant and impact-resistant composite PVC material and its preparation method, in order to solve the technical problem that the wear resistance and impact resistance of existing composite PVC materials need to be further improved.

[0007] The objective of this invention can be achieved through the following technical solution: a wear-resistant and impact-resistant composite PVC material, comprising the following raw material components by weight: 80-100 parts epoxy polyvinyl chloride, 10-15 parts plasticizer stabilizer, 10-12 parts impact modifier, 0.5-2 parts lubricant, 5-10 parts filler, 2-3 parts antioxidant and 2-3 parts heat stabilizer;

[0008] The preparation method of epoxy polyvinyl chloride includes the following steps:

[0009] A1. Add polyvinyl chloride and dechlorination liquid into a high-pressure reactor lined with polytetrafluoroethylene. After sealing, raise the temperature of the high-pressure reactor to 120-150℃ and keep it at that temperature for 1-2 hours. Then, after post-treatment, dechlorinated polyvinyl chloride is obtained.

[0010] The reaction principle for preparing dechlorinated polyvinyl chloride is as follows: This dechlorination reaction is an E2 elimination reaction. Sodium hydroxide, as a strong base, reacts with β-hydrogen and chlorine atoms in the polyvinyl chloride chain, thereby generating carbon-carbon double bonds in the polymer chain. The alcohol solution not only provides the reaction medium, but also accelerates the contact between hydroxyl groups and the polymer, thus improving the reaction efficiency.

[0011] A2. Add dechlorinated polyvinyl chloride and benzoic acid to a reaction vessel and stir. After the temperature of the reaction vessel is raised to 50-60℃, add peroxide solution dropwise to the reaction vessel, keep warm and stir for 1-2 hours, and then perform post-treatment to obtain epoxy polyvinyl chloride.

[0012] The reaction mechanism for preparing epoxy polyvinyl chloride is as follows:

[0013]

[0014] The reaction principle for preparing epoxy polyvinyl chloride is as follows: the oxygen atom of peroxybenzoic acid forms a covalent bond with the carbon atom in the double bond through an electrophilic reaction, generating a transient cyclic intermediate in the reaction, in which the double bond is oxidized to an epoxy structure, and the reaction finally generates an epoxide.

[0015] Further, in step A1, the ratio of polyvinyl chloride to dechlorination solution is 1-2 g: 25 mL. The dechlorination solution is composed of sodium hydroxide powder and ethanol in a ratio of 2-3 g: 25-30 mL. The post-treatment includes: after the reaction is completed, after the temperature of the reaction solution drops to room temperature, the reaction solution is filtered to collect the filter cake. The filter cake is placed in a drying oven at 60°C and vacuum dried until the filter cake reaches a constant weight to obtain dechlorinated polyvinyl chloride. In step A2, the ratio of dechlorinated polyvinyl chloride, benzoic acid, and peroxide solution is 2-3 g: 10-12 mL: 5-6 mL. The peroxide solution is composed of 98.0 wt% concentrated sulfuric acid and 30.0 wt% hydrogen peroxide solution in a ratio of 2-3 mL: 10-12 mL. The post-treatment includes: after the reaction is completed, after the temperature of the reaction solution drops to room temperature, the reaction solution is filtered to collect the filter cake. The filter cake is placed in a drying oven at 60°C and vacuum dried until the filter cake reaches a constant weight to obtain epoxy polyvinyl chloride.

[0016] Furthermore, the preparation method of the plasticizer stabilizer includes the following steps:

[0017] B1. Add the modified plasticizer and N,N-dimethylformamide to the reaction vessel and stir. After the temperature of the reaction vessel is raised to 80-90℃, continuously add saturated sodium hydroxide solution to the reaction vessel, control the pH of the system to 9-10, keep the reaction at the temperature for 30-40 min, and then process to obtain the saponified plasticizer.

[0018] The reaction equation for preparing saponified plasticizers is:

[0019]

[0020] The reaction principle for preparing saponified plasticizers is as follows: During the reaction, hydrogen atoms in the carboxyl group are released to form carboxylic acid anions. Hydroxide ions in sodium hydroxide combine with the hydrogen ions lost by the carboxylic acid to generate water. The carboxylic acid anions combine with sodium ions to generate the corresponding sodium salt, thus obtaining the saponified plasticizer.

[0021] B2. Add the saponified plasticizer and N,N-dimethylformamide to the reaction vessel and stir. After the temperature of the reaction vessel is raised to 80-90℃, saturated ammonia water is continuously added dropwise to the reaction vessel to control the pH of the system to 9-10. Modified powder is added to the reaction vessel and ammonia water is continuously added dropwise to control the pH of the system to 9-10. The plasticizer stabilizer is obtained by post-treatment.

[0022] The reaction equation for preparing plasticizer stabilizers is:

[0023]

[0024] The reaction principle for preparing plasticizer stabilizers is as follows: sodium ions in saponified plasticizers exchange ions with metal ions in metal chlorides, and two carboxylate ions combine with one divalent metal ion to form the corresponding metal carboxylate salt.

[0025] Further, in step B1, the stirring speed of the reactor is 80-120 rpm, and the ratio of modified plasticizer to N,N-dimethylformamide is 2-3 g: 10-12 mL. The post-treatment includes: after the reaction is completed, after the temperature of the reaction solution drops to room temperature, the reaction solution is filtered to collect the filter cake, and the filter cake is placed in a drying oven at 60°C and vacuum dried until the filter cake reaches a constant weight to obtain the saponified plasticizer; in step B2, the stirring speed of the reactor is 80-120 rpm, and the ratio of saponified plasticizer, N,N-dimethylformamide and modified powder is 2-3 g: 10-12 mL: 1-2 g. The modified powder is prepared by mixing calcium chloride and zinc chloride at a ratio of 1 g: 1 g. The post-treatment is as follows: after the reaction is completed, after the temperature of the reaction solution drops to room temperature, the reaction solution is filtered to collect the filter cake, and the filter cake is placed in a drying oven at 60°C and vacuum dried until the filter cake reaches a constant weight to obtain the plasticizer stabilizer.

[0026] Furthermore, the preparation method of the modified plasticizer includes the following steps:

[0027] C1. Add fumaric acid, 1,4-butenediol, dichlorobenzene and 98.0 wt% concentrated sulfuric acid to a reaction vessel, raise the temperature of the reaction vessel to 150-170℃, keep the reaction at this temperature for 12-16 hours, and then process to obtain modified polyester powder.

[0028] The reaction equation for preparing the modified plasticizer is:

[0029]

[0030] The reaction principle for preparing modified polyester powder is as follows: the carboxyl group of carboxylic acid and the hydroxyl group of 1,4-butenediol form ester bonds and release water molecules through a condensation reaction. Through polycondensation and control of the mass of the reactant monomers, carboxylic acid and alcohol are continuously linked to form a polymer, resulting in modified polyester segments with carboxyl groups as the end-cap structure.

[0031] C2. Add the modified polyester powder and formic acid to the reaction vessel and stir. After stirring at room temperature for 10-15 minutes, add concentrated sulfuric acid dropwise to the reaction vessel. Raise the temperature of the reaction vessel to 50-60℃ and continue to add 30.0wt% hydrogen peroxide solution dropwise to the reaction vessel. Keep the temperature and stir for 1-2 hours. The modified plasticizer is obtained after post-treatment.

[0032] The reaction equation for preparing the impact modifier is:

[0033]

[0034] The reaction principle for preparing modified plasticizers is as follows: the oxygen atom of peroxyformic acid forms a covalent bond with the carbon atom in the double bond through an electrophilic reaction, generating a transient cyclic intermediate in the reaction, in which the double bond is oxidized to an epoxy structure, and the reaction finally generates an epoxide.

[0035] Further, in step C1, the amounts of fumaric acid, 1,4-butenediol, dichlorobenzene, and 98.0 wt% concentrated sulfuric acid are 3-4 g: 1-2 g: 20-30 mL: 0.1-0.2 g. The post-treatment includes: after cooling the reaction vessel to room temperature, adding the reaction solution to a rotary evaporator with a water bath temperature of 80-100℃, and distilling under reduced pressure until no liquid is collected, obtaining modified polyester. The modified polyester is then ground and sieved through a 200-400 mesh sieve to obtain modified polyester powder. In step C2, the stirring speed of the reactor is 80-120 rpm, and the ratio of modified polyester powder, formic acid, 98.0 wt% concentrated sulfuric acid and 30.0 wt% hydrogen peroxide solution is 3-4 g: 12-15 mL: 0.3-0.5 g: 5-8 mL. The post-treatment includes: after the reaction is completed, after the temperature of the reaction solution drops to room temperature, the reaction solution is filtered to collect the filter cake, and the filter cake is placed in a drying oven at 60 ℃ and vacuum dried until the filter cake reaches a constant weight to obtain the modified plasticizer.

[0036] Furthermore, the method for preparing the impact modifier includes the following steps:

[0037] D1. Add deionized water and sodium dodecyl sulfate to the reactor, purge with nitrogen for protection, add composite monomer to the reactor, stir at room temperature for 10-15 min, then add potassium persulfate to the reactor and react at room temperature for 2-3 h. Post-processing yields latex micronuclei.

[0038] The reaction principle for preparing latex micronuclei is as follows: under the activation of surfactant, the double bonds of the composite monomer generate free radicals under the catalysis of potassium persulfate and continuously polymerize to form an oil-in-water emulsion droplet structure, which is then dried to obtain latex micronuclei.

[0039] D2. Add latex micronuclei, deionized water, and potassium persulfate to a reaction vessel, purge with nitrogen for protection, stir at room temperature for 15-20 min, and then add 1,3-bis(epoxyethylenemethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione to the reaction vessel. Raise the temperature of the reaction vessel to 70-80℃ and keep it at that temperature for 30-40 min. The post-treatment yields the impact-resistant agent.

[0040] The reaction principle for preparing the impact-resistant agent is as follows: Under the protection of nitrogen, latex micronuclei are suspended in deionized water to form a droplet structure. 1,3-bis(epoxyethylenemethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione continuously polymerizes on its surface under the catalysis of potassium persulfate to form a core structure, and finally the impact-resistant agent is prepared.

[0041] D3. Add the impact modifier, 2,3-biphenyl maleic anhydride, dimethyl sulfoxide and aluminum chloride to the reactor, raise the reactor temperature to 150-170℃, and then perform post-treatment to obtain the impact modifier.

[0042] The reaction equation for preparing the impact modifier is:

[0043]

[0044] In the formula:

[0045] The reaction principle for preparing the impact modifier is as follows: the Lewis acid aluminum chloride catalyst protonates the acid anhydride to generate hydrogen oxide ions and an acid anhydride intermediate. The epoxy group attacks the carbonyl carbon of the acid anhydride intermediate through a nucleophilic addition reaction to form a ring-opening product, thus obtaining the impact modifier.

[0046] Further, in step D1, the ratio of deionized water, sodium dodecyl sulfate, composite monomer, and potassium persulfate is 80-100 mL: 4-5 g: 30-40 g: 2-3 g. The composite monomer is obtained by mixing triallyl isocyanurate, tristyrene, 4-allyl-1,2-methylenedioxybenzene, and 2-methyl-2-acrylate-1,2-ethylene glycol ester in a molar ratio of 3:1:1:2. The post-treatment includes: after the reaction vessel is cooled to room temperature, the reaction solution is added to a rotary evaporator with a water bath temperature of 80-100℃ and distilled under reduced pressure until no liquid is collected, thus obtaining latex micronuclei.

[0047] Furthermore, in step D2, the ratio of latex micronuclei, deionized water, potassium persulfate, and 1,3-bis(epoxyethylenemethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione is 8-10g:30-50mL:1-2g:3-5g. The post-treatment includes: after the reaction is completed, after the temperature of the reaction solution drops to room temperature, the reaction solution is filtered to collect the filter cake, and the filter cake is placed in a drying oven at 60℃ and vacuum dried until the filter cake reaches a constant weight to obtain the impact inhibitor.

[0048] Furthermore, in step D3, the ratio of impact modifier, 2,3-biphenylmaleic anhydride, dimethyl sulfoxide, and aluminum chloride is 8-10g:2-3g:30-40mL:0.8-1.2g. The post-treatment includes: after the reaction is completed, after the temperature of the reaction solution drops to room temperature, the reaction solution is filtered to collect the filter cake, and the filter cake is placed in a drying oven at 60℃ and vacuum dried until the filter cake reaches constant weight to obtain the impact modifier.

[0049] This invention also proposes a method for preparing a wear-resistant and impact-resistant composite PVC material, comprising the following steps: mixing epoxy polyvinyl chloride, plasticizer, impact modifier, lubricant, filler, antioxidant and heat stabilizer evenly and then adding them to a twin-screw extruder, and then melt extruding to obtain composite polyvinyl chloride.

[0050] Furthermore, the lubricant is one or more of calcium stearate, zinc stearate, and polyethylene wax; the filler is one or more of nano-silica, alumina, and nano-zirconia; the antioxidant is one or more of antioxidant 1010, triphenyl phosphite, and dilauryl sulfide; and the heat stabilizer is one or more of tribasic lead sulfate, calcium stearate, and dibutyltin dilaurate.

[0051] Furthermore, the temperatures of the seven temperature zones of the twin-screw extruder from the feed inlet to the discharge outlet are 165℃, 170℃, 170℃, 175℃, 175℃, 180℃, and 180℃ respectively. The main engine speed of the twin-screw extruder is 80-120 rpm, and the pressure is 100-150 bar.

[0052] The present invention has the following beneficial effects:

[0053] 1. This invention involves dechlorinating and epoxidizing polyvinyl chloride (PVC) to obtain epoxy PVC. During the melt extrusion process with plasticizers, stabilizers, impact modifiers, and additives, the modified plasticizers and the epoxy groups within the epoxy PVC work synergistically to generate free radicals during the high-temperature processing of PVC. These free radicals combine with the hydrogen chloride gas generated from the pyrolysis of PVC to hybridize the PVC chain segments, giving them a complex spatial structure and significantly enhancing the material's wear resistance. Simultaneously, the free radicals within the chain segments react with the double bonds on the impact modifier to produce a Diels-Alder reaction, generating a cyclic structure that significantly enhances the material's impact resistance.

[0054] 2. The impact stabilizer prepared by this invention has a stable core-shell structure. During the impact process, this structure absorbs the impact energy, effectively mitigating external forces and preventing brittle fracture, thus giving the material superior impact resistance. This structural design avoids the phase separation phenomenon caused by traditional impact stabilizers and allows for uniform dispersion within the matrix, preventing agglomeration. During the combustion of composite polyvinyl chloride, the polyvinyl chloride segments continuously undergo pyrolysis to generate acidic gases. While the impact stabilizer absorbs these acidic gases, the acidic gases also disrupt the core-shell structure of the plasticizer stabilizer, promoting the carbonization of triazine rings in the core and shell structures to form a molten carbon layer, ultimately significantly enhancing the flame retardant properties of the material.

[0055] 3. The plasticizer stabilizer prepared by this invention uses polyester segments as the matrix. The molecular structure of polyester has high hardness and surface wear resistance. During the blending process with polyvinyl chloride, it significantly improves the impact resistance of the material. During the high-temperature processing of polyvinyl chloride, the metal soaps in the plasticizer stabilizer continuously absorb the hydrogen chloride gas generated by high-temperature pyrolysis, thereby inhibiting the chain pyrolysis reaction of polyvinyl chloride segments, further improving the wear resistance and impact resistance of the material. Metal chlorides are uniformly distributed inside the material, which not only insulates heat but also promotes the carbonization of the material and consumes the free radicals generated in the combustion chain reaction, thereby improving the flame retardant performance of the material. Compared with directly adding metal chlorides as flame retardants, this method makes the material distribution more uniform and less prone to agglomeration, thus enhancing the wear resistance of the material. Detailed Implementation

[0056] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] Example 1

[0058] This embodiment provides a method for preparing a wear-resistant and impact-resistant composite PVC material, including the following steps:

[0059] Step 1: Preparation of modified plasticizer

[0060] Weigh out 300.0g of fumaric acid, 120.0g of 1,4-butenediol, 2.5L of dichlorobenzene and 12.0g of 98.0wt% concentrated sulfuric acid and add them to a reaction vessel. Raise the temperature of the reaction vessel to 150℃ and keep it at that temperature for 12h. After the reaction vessel is cooled to room temperature, add the reaction solution to a rotary evaporator with a water bath temperature of 80℃ and distill under reduced pressure until no liquid is collected to obtain modified polyester. Grind the modified polyester into powder and pass it through a 200-mesh sieve to obtain modified polyester powder.

[0061] Weigh 320.0g of modified polyester powder and 1.2L of formic acid and add them to a reaction vessel. Stir at 80rpm for 10min at room temperature. Then, add 36.0g of concentrated sulfuric acid dropwise to the reaction vessel. Raise the temperature of the reaction vessel to 50℃ and continue to add 0.6L of 30.0wt% hydrogen peroxide solution dropwise. Keep the mixture warm and stir for 1h. After the reaction is complete, wait for the temperature of the reaction solution to drop to room temperature. Filter the reaction solution and collect the filter cake. Place the filter cake in a drying oven at 60℃ and vacuum dry it until the filter cake reaches a constant weight to obtain the modified plasticizer.

[0062] Step 2: Preparation of plasticizer stabilizer

[0063] Weigh 200.0g of modified plasticizer and 1.0L of N,N-dimethylformamide and add them to the reaction vessel. Stir at 80rpm. After the temperature of the reaction vessel is raised to 80℃, saturated sodium hydroxide solution is continuously added dropwise to the reaction vessel. The pH of the system is controlled at 9. The reaction is kept at this temperature for 30min. After the reaction is completed, the temperature of the reaction solution is lowered to room temperature. The reaction solution is filtered to collect the filter cake. The filter cake is placed in a drying oven at 60℃ and vacuum dried until the filter cake reaches a constant weight to obtain the saponified plasticizer.

[0064] Weigh out 10.0g of calcium chloride and 10.0g of zinc chloride to prepare the modified powder;

[0065] Weigh out 210.0g of saponified plasticizer and 1.0L of N,N-dimethylformamide and add them to the reaction vessel and stir. After the temperature of the reaction vessel is raised to 80℃, saturated ammonia water is continuously added dropwise to the reaction vessel to control the pH of the system to 9. Then, 100.0g of modified powder is added to the reaction vessel and ammonia water is continuously added dropwise to control the pH of the system to 9. After the reaction is completed, after the temperature of the reaction solution is lowered to room temperature, the reaction solution is filtered and the filter cake is collected. The filter cake is placed in a drying oven at 60℃ and vacuum dried until the filter cake reaches a constant weight to obtain the plasticizer stabilizer.

[0066] Step 3: Preparation of impact modifier

[0067] Triallyl isocyanurate, tristyrene, 4-allyl-1,2-methylenedioxybenzene and 2-methyl-2-acrylate-1,2-ethylene glycol ester were mixed in a molar ratio of 3:1:1:2 to obtain a composite monomer for later use.

[0068] Weigh out 4.0L of deionized water and 200.0g of sodium dodecyl sulfate and add them to the reaction vessel. After purging with nitrogen for protection, add 1.5kg of composite monomer to the reaction vessel and stir at room temperature for 10min. Then add 100.0g of potassium persulfate to the reaction vessel and react at room temperature for 2h. After the reaction vessel is cooled to room temperature, add the reaction solution to a rotary evaporator with a water bath temperature of 80℃ and distill under reduced pressure until no liquid is collected to obtain latex micronuclei.

[0069] Weigh out 400.0g of latex micronuclei, 1.5L of deionized water and 80.0g of potassium persulfate and add them to the reaction vessel. Purge with nitrogen for protection and stir at room temperature for 15min. Then add 200.0g of 1,3-bis(epoxyethylenemethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione to the reaction vessel. Raise the temperature of the reaction vessel to 70℃ and keep it at that temperature for 30min. After the reaction is complete, wait for the temperature of the reaction solution to drop to room temperature, filter the reaction solution and collect the filter cake. Place the filter cake in a drying oven at 60℃ and vacuum dry it until the filter cake reaches constant weight to obtain the impact-resistant agent.

[0070] Weigh out 400.0g of impact modifier, 120.0g of 2,3-biphenyl maleic anhydride, 1.5L of dimethyl sulfoxide and 45.0g of aluminum chloride and add them to the reaction vessel. Raise the temperature of the reaction vessel to 150℃. After the reaction is completed, wait for the temperature of the reaction solution to drop to room temperature, filter the reaction solution and collect the filter cake. Place the filter cake in a drying oven at 60℃ and vacuum dry it until the filter cake reaches a constant weight to obtain the impact modifier.

[0071] Step 4: Preparation of epoxy polyvinyl chloride

[0072] Weigh out 100.0g of sodium hydroxide powder and 1.25L of ethanol to prepare a dechlorination solution;

[0073] Weigh 100.0g of polyvinyl chloride and 1.25L of dechlorination solution and add them to a high-pressure reactor lined with polytetrafluoroethylene. After sealing the high-pressure reactor, transfer it to an oil bath. Raise the temperature of the oil bath to 120℃ and keep it at that temperature for 1 hour. After the reaction is complete, wait for the temperature of the reaction solution to drop to room temperature, filter the reaction solution and collect the filter cake. Place the filter cake in a drying oven at 60℃ and vacuum dry it until the filter cake reaches a constant weight to obtain dechlorinated polyvinyl chloride.

[0074] Weigh out 20.0 mL of 98.0 wt% concentrated sulfuric acid and 100.0 mL of 30.0 wt% hydrogen peroxide solution to prepare the peroxide solution;

[0075] Weigh 200.0g of dechlorinated polyvinyl chloride and 1.0L of benzoic acid and add them to the reaction vessel and stir. After the temperature of the reaction vessel is raised to 50℃, add 550.0mL of peroxide solution dropwise to the reaction vessel and keep it at the temperature and stir for 1h. After the reaction is completed, wait for the temperature of the reaction solution to drop to room temperature, filter the reaction solution and collect the filter cake. Place the filter cake in a drying oven at 60℃ and vacuum dry it until the filter cake has a constant weight to obtain epoxy polyvinyl chloride.

[0076] Step 5: Preparation of composite polyvinyl chloride

[0077] Weigh out 800.0g of epoxy polyvinyl chloride, 100.0g of plasticizer stabilizer, 100.0g of impact modifier, 5.0g of calcium stearate, 50.0g of nano silica, 20.0g of dilauryl sulfide, and 20.0g of dibutyltin dilaurate. Mix them evenly and add them to a twin-screw extruder. The temperatures of the seven temperature zones of the twin-screw extruder from the feed port to the discharge port are 165℃, 170℃, 170℃, 175℃, 175℃, 180℃, and 180℃ respectively. The main speed of the twin-screw extruder is 80rpm and the pressure is 100bar. The composite polyvinyl chloride is obtained by melt extrusion.

[0078] Example 2

[0079] This embodiment provides a method for preparing a wear-resistant and impact-resistant composite PVC material, including the following steps:

[0080] Step 1: Preparation of modified plasticizer

[0081] Weigh out 350.0g of fumaric acid, 120.0g of 1,4-butenediol, 2.4L of dichlorobenzene and 12.0g of 98.0wt% concentrated sulfuric acid and add them to a reaction vessel. Raise the temperature of the reaction vessel to 170℃ and keep it at that temperature for 16h. After the reaction vessel is cooled to room temperature, add the reaction solution to a rotary evaporator with a water bath temperature of 100℃ and distill under reduced pressure until no liquid is collected to obtain modified polyester. Grind the modified polyester into powder and pass it through a 400-mesh sieve to obtain modified polyester powder.

[0082] Weigh 320.0g of modified polyester powder and 1.5L of formic acid and add them to a reaction vessel. Stir at 120rpm for 15min at room temperature. Then, add 32.0g of concentrated sulfuric acid dropwise to the reaction vessel. Raise the temperature of the reaction vessel to 60℃ and continue to add 0.6L of 30.0wt% hydrogen peroxide solution dropwise. Keep the mixture warm and stir for 2h. After the reaction is complete, wait for the temperature of the reaction solution to drop to room temperature. Filter the reaction solution and collect the filter cake. Place the filter cake in a drying oven at 60℃ and vacuum dry it until the filter cake reaches a constant weight to obtain the modified plasticizer.

[0083] Step 2: Preparation of plasticizer stabilizer

[0084] Weigh out 240.0g of modified plasticizer and 1.2L of N,N-dimethylformamide and add them to the reaction vessel. Stir at 120rpm. After the temperature of the reaction vessel is raised to 90℃, saturated sodium hydroxide solution is continuously added dropwise to the reaction vessel to control the pH of the system to 10. Keep the reaction at this temperature for 40min. After the reaction is completed, wait for the temperature of the reaction solution to drop to room temperature, filter the reaction solution and collect the filter cake. Place the filter cake in a drying oven at 60℃ and vacuum dry it until the filter cake reaches a constant weight to obtain the saponified plasticizer.

[0085] Weigh out 10.0g of calcium chloride and 10.0g of zinc chloride to prepare the modified powder;

[0086] Weigh 200.0g of saponified plasticizer and 1.2L of N,N-dimethylformamide and add them to the reaction vessel and stir. After the temperature of the reaction vessel is raised to 90℃, saturated ammonia water is continuously added dropwise to the reaction vessel to control the pH of the system to 10. Then, 160.0g of modified powder is added to the reaction vessel and ammonia water is continuously added dropwise to control the pH of the system to 10. After the reaction is completed, after the temperature of the reaction solution drops to room temperature, the reaction solution is filtered and the filter cake is collected. The filter cake is placed in a drying oven at 60℃ and vacuum dried until the filter cake reaches a constant weight to obtain the plasticizer stabilizer.

[0087] Step 3: Preparation of impact modifier

[0088] Triallyl isocyanurate, tristyrene, 4-allyl-1,2-methylenedioxybenzene and 2-methyl-2-acrylate-1,2-ethylene glycol ester were mixed in a molar ratio of 3:1:1:2 to obtain a composite monomer for later use.

[0089] Weigh out 5.0 L of deionized water and 250.0 g of sodium dodecyl sulfate and add them to the reaction vessel. After purging with nitrogen for protection, add 1.8 kg of composite monomer to the reaction vessel and stir at room temperature for 15 min. Then add 120.0 g of potassium persulfate to the reaction vessel and react at room temperature for 3 h. After the reaction vessel is cooled to room temperature, add the reaction solution to a rotary evaporator with a water bath temperature of 000℃ and distill under reduced pressure until no liquid is collected to obtain latex micronuclei.

[0090] Weigh out 500.0g of latex micronuclei, 2.0L of deionized water and 80.0g of potassium persulfate and add them to the reaction vessel. Purge with nitrogen for protection and stir at room temperature for 20min. Then add 160.0g of 1,3-bis(epoxyethylenemethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione to the reaction vessel. Raise the temperature of the reaction vessel to 80℃ and keep it at that temperature for 40min. After the reaction is complete, wait for the temperature of the reaction solution to drop to room temperature, filter the reaction solution and collect the filter cake. Place the filter cake in a drying oven at 60℃ and vacuum dry it until the filter cake reaches constant weight to obtain the impact-resistant agent.

[0091] Weigh out 450.0g of impact modifier, 120.0g of 2,3-biphenyl maleic anhydride, 2.0L of dimethyl sulfoxide and 60.0g of aluminum chloride and add them to the reaction vessel. Raise the temperature of the reaction vessel to 170℃. After the reaction is completed, wait for the temperature of the reaction solution to drop to room temperature, filter the reaction solution and collect the filter cake. Place the filter cake in a drying oven at 60℃ and vacuum dry it until the filter cake reaches a constant weight to obtain the impact modifier.

[0092] Step 4: Preparation of epoxy polyvinyl chloride

[0093] Weigh out 280.0g of sodium hydroxide powder and 3.0L of ethanol to prepare a dechlorination solution;

[0094] Weigh 180.0g of polyvinyl chloride and 2.5L of dechlorination solution and add them to a high-pressure reactor lined with polytetrafluoroethylene. After sealing the high-pressure reactor, transfer it to an oil bath. Raise the temperature of the oil bath to 150℃ and keep it at that temperature for 2 hours. After the reaction is complete, wait for the temperature of the reaction solution to drop to room temperature, filter the reaction solution and collect the filter cake. Place the filter cake in a drying oven at 60℃ and vacuum dry it until the filter cake reaches a constant weight to obtain dechlorinated polyvinyl chloride.

[0095] Weigh out 300.0 mL of 98.0 wt% concentrated sulfuric acid and 1.2 L of 30.0 wt% hydrogen peroxide solution to prepare the peroxide solution;

[0096] Weigh out 300.0g of dechlorinated polyvinyl chloride and 1.2L of benzoic acid and add them to the reaction vessel and stir. After the temperature of the reaction vessel is raised to 60℃, add 600.0mL of peroxide solution dropwise to the reaction vessel and keep it at the temperature and stir for 2h. After the reaction is completed, wait for the temperature of the reaction solution to drop to room temperature, filter the reaction solution and collect the filter cake. Place the filter cake in a drying oven at 60℃ and vacuum dry it until the filter cake reaches a constant weight to obtain epoxy polyvinyl chloride.

[0097] Step 5: Preparation of composite polyvinyl chloride

[0098] Weigh out 1000.0g of epoxy polyvinyl chloride, 150.0g of plasticizer stabilizer, 120.0g of impact modifier, 20.0g of calcium stearate, 100.0g of nano silica, 30.0g of dilauryl sulfide and 24.0g of dibutyltin dilaurate, mix them evenly and add them to a twin-screw extruder. The temperatures of the seven temperature zones of the twin-screw extruder from the feed port to the discharge port are 165℃, 170℃, 170℃, 175℃, 175℃, 180℃ and 180℃ respectively. The main speed of the twin-screw extruder is 120rpm and the pressure is 150bar. The composite polyvinyl chloride is obtained by melt extrusion.

[0099] Example 3

[0100] This embodiment provides a method for preparing a wear-resistant and impact-resistant composite PVC material, including the following steps:

[0101] Step 1: Preparation of modified plasticizer

[0102] Weigh out 360.0g of fumaric acid, 160.0g of 1,4-butenediol, 2.5L of dichlorobenzene and 15.0g of 98.0wt% concentrated sulfuric acid and add them to a reaction vessel. Raise the temperature of the reaction vessel to 160℃ and keep it at that temperature for 14h. After the reaction vessel is cooled to room temperature, add the reaction solution to a rotary evaporator with a water bath temperature of 90℃ and distill under reduced pressure until no liquid is collected to obtain modified polyester. Grind the modified polyester into powder and pass it through a 300-mesh sieve to obtain modified polyester powder.

[0103] Weigh 360.0g of modified polyester powder and 1.2L of formic acid and add them to a reaction vessel. Stir at 100rpm for 12min at room temperature. Then, add 36.0g of concentrated sulfuric acid dropwise to the reaction vessel. Raise the temperature of the reaction vessel to 60℃ and continue to add 600.0mL of 30.0wt% hydrogen peroxide solution dropwise. Keep the mixture warm and stir for 2h. After the reaction is complete, wait for the temperature of the reaction solution to drop to room temperature. Filter the reaction solution and collect the filter cake. Place the filter cake in a drying oven at 60℃ and vacuum dry it until the filter cake reaches a constant weight to obtain the modified plasticizer.

[0104] Step 2: Preparation of plasticizer stabilizer

[0105] Weigh 250.0g of modified plasticizer and 1.0L of N,N-dimethylformamide and add them to the reaction vessel. Stir at 100rpm. After the temperature of the reaction vessel is raised to 85℃, saturated sodium hydroxide solution is continuously added dropwise to the reaction vessel to control the pH of the system to 9.5. Keep the reaction at this temperature for 36min. After the reaction is completed, wait for the temperature of the reaction solution to drop to room temperature, filter the reaction solution and collect the filter cake. Place the filter cake in a drying oven at 60℃ and vacuum dry it until the filter cake reaches a constant weight to obtain the saponified plasticizer.

[0106] Weigh out 10.0g of calcium chloride and 10.0g of zinc chloride to prepare the modified powder;

[0107] Weigh 250.0g of saponified plasticizer and 1.1L of N,N-dimethylformamide and add them to the reaction vessel and stir. After the temperature of the reaction vessel is raised to 85℃, saturated ammonia water is continuously added dropwise to the reaction vessel to control the pH of the system to 9.5. Then, 150.0g of modified powder is added to the reaction vessel and ammonia water is continuously added dropwise to control the pH of the system to 9.5. After the reaction is completed, after the temperature of the reaction solution drops to room temperature, the reaction solution is filtered and the filter cake is collected. The filter cake is placed in a drying oven at 60℃ and vacuum dried until the filter cake reaches a constant weight to obtain the plasticizer stabilizer.

[0108] Step 3: Preparation of impact modifier

[0109] Triallyl isocyanurate, tristyrene, 4-allyl-1,2-methylenedioxybenzene and 2-methyl-2-acrylate-1,2-ethylene glycol ester were mixed in a molar ratio of 3:1:1:2 to obtain a composite monomer for later use.

[0110] Weigh out 4.5 L of deionized water and 225.0 g of sodium dodecyl sulfate and add them to the reaction vessel. After purging with nitrogen for protection, add 1.75 kg of composite monomer to the reaction vessel. Stir at room temperature for 12 min, then add 250.0 g of potassium persulfate to the reaction vessel. React at room temperature for 2 h. After the reaction vessel is cooled to room temperature, add the reaction solution to a rotary evaporator with a water bath temperature of 90 °C and distill under reduced pressure until no liquid is collected to obtain latex micronuclei.

[0111] Weigh out 450.0g of latex micronuclei, 1.6L of deionized water and 80.0g of potassium persulfate and add them to the reaction vessel. Purge with nitrogen for protection and stir at room temperature for 18min. Then add 200.0g of 1,3-bis(epoxyethylenemethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione to the reaction vessel. Raise the temperature of the reaction vessel to 75℃ and keep it at that temperature for 36min. After the reaction is complete, wait for the temperature of the reaction solution to drop to room temperature, filter the reaction solution and collect the filter cake. Place the filter cake in a drying oven at 60℃ and vacuum dry it until the filter cake reaches constant weight to obtain the impact-resistant agent.

[0112] Weigh out 450.0g of impact modifier, 125.0g of 2,3-biphenyl maleic anhydride, 1.75L of dimethyl sulfoxide and 50.0g of aluminum chloride and add them to the reaction vessel. Raise the temperature of the reaction vessel to 160℃. After the reaction is completed, wait for the temperature of the reaction solution to drop to room temperature, filter the reaction solution and collect the filter cake. Place the filter cake in a drying oven at 60℃ and vacuum dry it until the filter cake reaches a constant weight to obtain the impact modifier.

[0113] Step 4: Preparation of epoxy polyvinyl chloride

[0114] Weigh out 125.0 g of sodium hydroxide powder and 1.25 L of ethanol to prepare a dechlorination solution;

[0115] Weigh 150.0g of polyvinyl chloride and 2.5L of dechlorination solution and add them to a high-pressure reactor lined with polytetrafluoroethylene. After sealing the high-pressure reactor, transfer it to an oil bath. Raise the temperature of the oil bath to 135℃ and keep it at that temperature for 2 hours. After the reaction is complete, wait for the temperature of the reaction solution to drop to room temperature, filter the reaction solution and collect the filter cake. Place the filter cake in a drying oven at 60℃ and vacuum dry it until the filter cake reaches a constant weight to obtain dechlorinated polyvinyl chloride.

[0116] Weigh out 250.0 mL of 98.0 wt% concentrated sulfuric acid and 1.2 L of 30.0 wt% hydrogen peroxide solution to prepare the peroxide solution;

[0117] Weigh 250.0g of dechlorinated polyvinyl chloride and 1.2L of benzoic acid and add them to the reaction vessel and stir. After the temperature of the reaction vessel is raised to 55℃, add 550.0mL of peroxide solution dropwise to the reaction vessel and keep it at the temperature and stir for 2h. After the reaction is completed, wait for the temperature of the reaction solution to drop to room temperature, filter the reaction solution and collect the filter cake. Place the filter cake in a drying oven at 60℃ and vacuum dry it until the filter cake reaches a constant weight to obtain epoxy polyvinyl chloride.

[0118] Step 5: Preparation of composite polyvinyl chloride

[0119] Weigh out 960.0g of epoxy polyvinyl chloride, 120.0g of plasticizer stabilizer, 100.0g of impact modifier, 10.0g of calcium stearate, 80.0g of nano silica, 25.0g of dilauryl sulfide, and 25.0g of dibutyltin dilaurate. Mix them evenly and add them to a twin-screw extruder. The temperatures of the seven temperature zones of the twin-screw extruder from the feed port to the discharge port are 165℃, 170℃, 170℃, 175℃, 175℃, 180℃, and 180℃ respectively. The main speed of the twin-screw extruder is 100rpm and the pressure is 125bar. The composite polyvinyl chloride is obtained by melt extrusion.

[0120] Comparative Example 1

[0121] The difference between this comparative example and Example 9 is that in step one, the process of preparing the modified plasticizer is omitted, and in step two, the modified polyester powder is used to replace the modified plasticizer in an equal amount.

[0122] Comparative Example 2

[0123] The difference between this comparative example and Example 9 is that in step two, the process of preparing the plasticizer stabilizer is omitted, and in step five, an equal amount of saponified plasticizer is used to replace the plasticizer stabilizer.

[0124] Comparative Example 3

[0125] The difference between this comparative example and Example 9 is that in step three, the process of preparing the impact modifier is omitted, and in step five, an equal amount of impact modifier is used to replace the impact modifier.

[0126] Comparative Example 4

[0127] The difference between this comparative example and Example 9 is that in step four, the process of preparing epoxy polyvinyl chloride is omitted, and in step five, dechlorinated polyvinyl chloride is used to replace epoxy polyvinyl chloride in an equal amount.

[0128] Performance testing:

[0129] The volumetric abrasion of the composite polyvinyl chloride prepared in Examples 1-3 and Comparative Examples 1-3 was tested in accordance with the standard GB / T 9867-2008 "Determination of abrasion resistance of vulcanized rubber or thermoplastic rubber (rotary roller abrasion tester method)".

[0130] The cantilever beam impact strength of the composite polyvinyl chloride prepared in Examples 1-3 and Comparative Examples 1-3 was tested in accordance with the standard GB / T 1843-2008 "Determination of impact strength of plastic cantilever beam".

[0131] The acidity of the combustion-released gases of the composite polyvinyl chloride prepared in Examples 1-3 and Comparative Examples 1-3 was tested in accordance with the standard GB / T 32129-2015 "Halogen-free Low-smoke Flame-retardant Cable Material for Wires and Cables".

[0132] The vertical flammability ratings of the composite polyvinyl chloride prepared in Examples 1-3 and Comparative Examples 1-3 were determined according to standard GB / T 2408-2021 "Determination of flammability of plastics - Horizontal and Vertical Methods".

[0133] The limiting oxygen index of the composite polyvinyl chloride prepared in Examples 1-3 and Comparative Examples 1-3 was tested according to the standard GB / T 2406.2-2009 "Determination of Combustion Behavior by Oxygen Index Method for Plastics - Part 2: Room Temperature Test". The specific data are shown in Table 1.

[0134] Table 1 - Performance Data of Each Sample

[0135]

[0136]

[0137] Data Analysis:

[0138] Comparative analysis of the data in Table 1 above shows that the cantilever beam impact strength of the composite polyvinyl chloride prepared in this invention is 42.5 kJ·m. -2 Volumetric wear: 29.8mm 3The combustion gases were acidic (HCl content was 4.7%), the vertical combustion rating was V-0, and the limiting oxygen index was 34.8%, all of which were better than the comparative example.

[0139] Comparing the data from Example 3 and Comparative Examples 1-4 reveals that the modified plasticizer obtained by epoxidation of the modified polyester contains a large number of epoxy groups. These epoxy groups synergistically work with the epoxy groups within the epoxy polyvinyl chloride (PVC). During the high-temperature processing of PVC, the free radicals generated from ring opening combine with the hydrogen chloride gas produced by the pyrolysis of PVC to hybridize the PVC segments, giving them a complex spatial structure and significantly enhancing the material's wear resistance. Simultaneously, as PVC pyrolysis produces hydrogen chloride gas, the free radicals within the segments undergo a Diels-Alder reaction with the double bonds on the impact modifier to produce a cyclic structure, significantly enhancing the material's impact resistance. Furthermore, during the combustion of the composite PVC, the PVC segments continuously undergo pyrolysis to produce acidic gases. While the plasticizer absorbs these acidic gases, the acidic gases disrupt the core-shell structure of the plasticizer, promoting the carbonization of the triazine rings inside and outside the core-shell structure, forming a molten carbon layer, ultimately significantly enhancing the material's flame retardant properties.

[0140] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A wear-resistant and impact-resistant composite PVC material, characterized in that, It comprises the following raw materials in parts by weight: 80-100 parts epoxy polyvinyl chloride, 10-15 parts plasticizer stabilizer, 10-12 parts impact modifier, 0.5-2 parts lubricant, 5-10 parts filler, 2-3 parts antioxidant and 2-3 parts heat stabilizer; The preparation method of epoxy polyvinyl chloride includes the following steps: A1. Add polyvinyl chloride and dechlorination liquid to a high-pressure reactor lined with polytetrafluoroethylene. After sealing the high-pressure reactor, transfer it to an oil bath. Raise the temperature of the oil bath to 120-150℃ and keep it at that temperature for 1-2 hours. Post-processing yields dechlorinated polyvinyl chloride. A2. Add dechlorinated polyvinyl chloride and benzoic acid to a reaction vessel and stir. After the temperature of the reaction vessel is raised to 50-60℃, add peroxide solution dropwise to the reaction vessel, keep warm and stir for 1-2 hours, and then process to obtain epoxy polyvinyl chloride. The preparation method of the plasticizer stabilizer includes the following steps: B1. Add the modified plasticizer and N,N-dimethylformamide to the reaction vessel and stir. After the temperature of the reaction vessel is raised to 80-90℃, continuously add saturated sodium hydroxide solution to the reaction vessel, control the pH of the system to 9-10, keep the reaction at the temperature for 30-40 min, and then process to obtain the saponified plasticizer. B2. Add the saponified plasticizer and N,N-dimethylformamide to the reaction vessel and stir. After the temperature of the reaction vessel is raised to 80-90℃, saturated ammonia water is continuously added dropwise to the reaction vessel to control the pH of the system to 9-10. Modified powder is added to the reaction vessel and ammonia water is continuously added dropwise to control the pH of the system to 9-10. The plasticizer stabilizer is obtained by post-treatment. The preparation method of the modified plasticizer includes the following steps: C1. Add fumaric acid, 1,4-butenediol, dichlorobenzene and 98.0 wt% concentrated sulfuric acid to a reactor, raise the reactor temperature to 150-170℃, keep the reaction at this temperature for 12-16 hours, and then process to obtain modified polyester powder. C2. Add the modified polyester powder and formic acid to the reaction vessel and stir. After stirring at room temperature for 10-15 minutes, add concentrated sulfuric acid dropwise to the reaction vessel. Raise the temperature of the reaction vessel to 50-60℃ and continue to add 30.0wt% hydrogen peroxide solution dropwise to the reaction vessel. Keep the temperature and stir for 1-2 hours. The modified plasticizer is obtained after post-treatment. The method for preparing the impact modifier includes the following steps: D1. Add deionized water and sodium dodecyl sulfate to the reactor, purge with nitrogen for protection, add composite monomer to the reactor, stir at room temperature for 10-15 min, then add potassium persulfate to the reactor and react at room temperature for 2-3 h. Post-processing yields latex micronuclei. D2. Add latex micronuclei, deionized water, and potassium persulfate to a reaction vessel, purge with nitrogen for protection, stir at room temperature for 15-20 min, and then add 1,3-bis(epoxyethylenemethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione to the reaction vessel. Raise the temperature of the reaction vessel to 70-80℃ and keep it at that temperature for 30-40 min. The post-treatment yields the impact-resistant agent. D3. Add the impact modifier, 2,3-biphenyl maleic anhydride, dimethyl sulfoxide and aluminum chloride to the reactor, raise the reactor temperature to 150-170℃, and then perform post-treatment to obtain the impact modifier.

2. The wear-resistant and impact-resistant composite PVC material according to claim 1, characterized in that, In step A1, the ratio of polyvinyl chloride to dechlorination solution is 1-2 g: 25 mL, and the dechlorination solution is prepared by mixing sodium hydroxide powder and ethanol at a ratio of 2-3 g: 25-30 mL. In step A2, the ratio of dechlorinated polyvinyl chloride, benzoic acid, and peroxide solution is 2-3 g: 10-12 mL: 5-6 mL, and the peroxide solution is prepared by mixing 98.0 wt% concentrated sulfuric acid and 30.0 wt% hydrogen peroxide solution at a ratio of 2-3 mL: 10-12 mL.

3. The wear-resistant and impact-resistant composite PVC material according to claim 1, characterized in that, In step B1, the ratio of modified plasticizer to N,N-dimethylformamide is 2-3g:10-12mL; in step B2, the ratio of saponified plasticizer, N,N-dimethylformamide and modified powder is 2-3g:10-12mL:1-2g, and the modified powder is prepared from calcium chloride and zinc chloride in a ratio of 1g:1g.

4. The wear-resistant and impact-resistant composite PVC material according to claim 1, characterized in that, In step C1, the amounts of fumaric acid, 1,4-butenediol, dichlorobenzene, and 98.0 wt% concentrated sulfuric acid are 3-4 g: 1-2 g: 20-30 mL: 0.1-0.2 g; in step C2, the ratio of modified polyester powder, formic acid, 98.0 wt% concentrated sulfuric acid, and 30.0 wt% hydrogen peroxide solution is 3-4 g: 12-15 mL: 0.3-0.5 g: 5-8 mL.

5. The wear-resistant and impact-resistant composite PVC material according to claim 1, characterized in that, In step D1, the ratio of deionized water, sodium dodecyl sulfate, composite monomer, and potassium persulfate is 80-100 mL: 4-5 g: 30-40 g: 2-3 g. The composite monomer is obtained by mixing triallyl isocyanurate, tristyrene, 4-allyl-1,2-methylenedioxybenzene, and 2-methyl-2-acrylate-1,2-ethylene glycol ester in a molar ratio of 3:1:1:

2. In step D2, the latex microcore, deionized water, and potassium persulfate are used in a mixture of... The ratio of potassium sulfate to 1,3-bis(epoxyethylenemethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione is 8-10 g: 30-50 mL: 1-2 g: 3-5 g; in step D3, the ratio of impact agent, 2,3-biphenylmaleic anhydride, dimethyl sulfoxide, and aluminum chloride is 8-10 g: 2-3 g: 30-40 mL: 0.8-1.2 g.

6. A method for preparing a wear-resistant and impact-resistant composite PVC material as described in any one of claims 1-5, characterized in that, Includes the following steps: After uniformly mixing epoxy polyvinyl chloride, plasticizer, impact modifier, lubricant, filler, heat stabilizer, antioxidant, and heat stabilizer, the mixture is added to a twin-screw extruder and melt-extruded to obtain composite polyvinyl chloride.

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