Wear-resistant and impact-resistant composite PVC (polyvinyl chloride) material and preparation method thereof

Abstract

The invention discloses a wear-resistant and impact-resistant composite PVC material and a preparation method thereof, and belongs to the technical field of high polymer materials, the wear-resistant and impact-resistant composite PVC material comprises the following raw materials by weight: 80-100 parts of epoxy polyvinyl chloride, 10-15 parts of a plasticizing stabilizer, 10-12 parts of an impact modifier, 0.5-2 parts of a lubricant, 5-10 parts of a filler, 2-3 parts of an antioxidant and 2-3 parts of a heat stabilizer; the preparation method comprises the following steps: preparing a metal soap stabilizer, absorbing pyrolysis gas, decomposing to generate metal chloride, enhancing the flame retardant property of the material, and uniformly dispersing the metal soap stabilizer as a filler in the material, so that an epoxy group in the prepared modifier absorbs hydrogen chloride and hybridizes a polyvinyl chloride chain segment at the same time, thereby enhancing the flame retardant property of the material. And a double-bond structure reacts with pyrolysis free radicals to generate an annular structure, so that the impact resistance of the material is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a wear-resistant and impact-resistant composite PVC material and a preparation method thereof. Background Art

[0002] Initially, the 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. With the rise of filler modification technology, especially the application of nanofillers, breakthroughs have been made in material performance.

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

[0004] Prior art CN118725483A discloses a wear-resistant and corrosion-resistant polyvinyl chloride cable material, which significantly improves the wear resistance of the cable material by adding performance-enhancing fillers, and reduces the friction resistance of the cable during the extrusion molding process, so that the cable is not easily damaged when subjected to external wear, thereby extending the service life of the cable; however, part of the metal oxides of the added performance-enhancing material are not modified and are directly added to the material. The hydrogen chloride gas generated during the high-temperature extrusion process will corrode the fillers, resulting in a decrease in the wear resistance of the material. In addition, the polarity difference between the directly added metal oxides and polyvinyl chloride is large, resulting in weak interface bonding, so that the impact resistance of the material needs to be further improved.

[0005] In view of the technical defects in this aspect, a solution is now proposed. Summary of the invention

[0006] The object of the present invention is to provide a wear-resistant and impact-resistant composite PVC material and a preparation method thereof, so as to solve the technical problem that the wear resistance and impact resistance of the composite PVC material in the prior art need to be further improved.

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

[0008] Wherein, the preparation method of epoxy polyvinyl chloride comprises 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° C., keep the temperature for 1-2 hours, and post-treat to obtain dechlorinated polyvinyl chloride.

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

[0011] A2. Add dechlorinated polyvinyl chloride and benzoic acid into a reactor and stir. After the temperature of the reactor rises to 50-60°C, add peroxide solution dropwise into the reactor, keep warm and stir for 1-2 hours, and obtain epoxy polyvinyl chloride by post-treatment.

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

[0013]

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

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

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

[0017] B1. Add the modified plasticizer and N,N-dimethylformamide into the reactor and stir. After the temperature of the reactor is raised to 80-90°C, continuously drop saturated sodium hydroxide solution into the reactor to control the pH of the system to 9-10. Keep the temperature for 30-40 minutes and perform post-treatment to obtain a saponified plasticizer.

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

[0019]

[0020] The reaction principle for preparing saponified plasticizer is as follows: during the reaction, the hydrogen atom in the carboxyl group is separated to form a carboxylic acid anion, the hydroxide ion in the sodium hydroxide combines with the hydrogen ion lost by the carboxylic acid to generate water, and the carboxylic acid anion combines with the sodium ion to generate the corresponding sodium salt to obtain the saponified plasticizer.

[0021] B2. Add saponified plasticizer and N,N-dimethylformamide into the reactor and stir. After the temperature of the reactor is raised to 80-90°C, continue to drip saturated ammonia water into the reactor to control the pH value of the system to 9-10. Add modified powder into the reactor and continue to drip ammonia water to control the pH value of the system to 9-10. Post-process to obtain the plasticizer stabilizer.

[0022] The reaction equation for preparing the plasticizer stabilizer is:

[0023]

[0024] The reaction principle for preparing the plasticizer stabilizer is: the sodium ions in the saponified plasticizer are ion exchanged with the metal ions in the metal chloride, and every two carboxylates are combined with one divalent metal ion to form corresponding metal carboxylates.

[0025] Further, in step B1, the stirring rate of the reactor is 80-120rpm, the amount ratio of the modified plasticizer and N,N-dimethylformamide is 2-3g:10-12mL, and the post-treatment includes: after the reaction is completed, after the temperature of the reaction liquid is reduced to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight, thereby obtaining a saponified plasticizer; in step B2, the stirring rate of the reactor is 80-120rpm, the amount ratio of the saponified plasticizer, N,N-dimethylformamide and the modified powder is 2-3g:10-12mL:1-2g, and the modified powder is prepared by configuring calcium chloride and zinc chloride at a dosage ratio of 1g:1g, and the post-treatment is obtained: after the reaction is completed, after the temperature of the reaction liquid is reduced to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight, thereby obtaining a plasticizer stabilizer.

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

[0027] C1, adding fumaric acid, 1,4-butenediol, dichlorobenzene and 98.0wt% concentrated sulfuric acid into a reactor, raising the temperature of the reactor to 150-170°C, keeping the temperature for reaction for 12-16h, and post-treating 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 condensation reaction. Through polycondensation and control of the mass of reactive monomers, carboxylic acid and alcohol are continuously connected to form a high molecular polymer to obtain a modified polyester segment with a carboxyl group as the end-capping structure.

[0031] C2. Add the modified polyester powder and formic acid into a reactor and stir. After stirring for 10-15 minutes at room temperature, add concentrated sulfuric acid dropwise into the reactor. The temperature of the reactor is raised to 50-60°C. Continue to add 30.0wt% hydrogen peroxide solution dropwise into the reactor. Keep warm and stir for 1-2 hours. Post-treat to obtain a modified plasticizer.

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

[0033]

[0034] The reaction principle for preparing the modified plasticizer is: the oxygen atom of peroxyformic acid forms a covalent bond with the carbon atom in the double bond through an electrophilic reaction, and a short-lived cyclic intermediate is generated 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 amount of fumaric acid, 1,4-butenediol, dichlorobenzene and 98.0wt% concentrated sulfuric acid is 3-4g: 1-2g: 20-30mL: 0.1-0.2g, and the post-treatment includes: after the reactor is cooled to room temperature, the reaction solution is added to a rotary evaporator with a water bath temperature of 80-100°C, and the reduced pressure distillation is performed until no liquid is produced to obtain a modified polyester, and the modified polyester is ground and crushed and then passed through a 200-400 mesh sieve to obtain a modified polyester powder. ; In step C2, the stirring rate of the reactor is 80-120rpm, the dosage ratio of the modified polyester powder, formic acid, 98.0wt% concentrated sulfuric acid and 30.0wt% hydrogen peroxide solution is 3-4g:12-15mL:0.3-0.5g:5-8mL, and the post-treatment includes: after the reaction is completed, after the temperature of the reaction liquid is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight to obtain a modified plasticizer.

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

[0037] D1. Deionized water and sodium dodecyl sulfate are added to a reactor, and after nitrogen protection is introduced, the composite monomer is added to the reactor, and after stirring at room temperature for 10-15 minutes, potassium persulfate is continuously added to the reactor, and the reaction is carried out at room temperature for 2-3 hours, and latex micronuclei are obtained by post-treatment;

[0038] The reaction principle for preparing latex micronuclei is as follows: under the activation of surfactants, the double bonds of the composite monomers generate free radicals under the catalysis of potassium persulfate and continuously polymerize to form an oil-in-water emulsion droplet structure, and the latex micronuclei are obtained after drying.

[0039] D2, adding latex micronuclei, deionized water and potassium persulfate into a reactor, introducing nitrogen protection, stirring at room temperature for 15-20 minutes, adding 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione into the reactor, raising the temperature of the reactor to 70-80°C, keeping the temperature for reaction for 30-40 minutes, and post-treating to obtain an 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 an emulsion structure, and 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione is continuously polymerized on its surface under the catalysis of potassium persulfate to form a nucleus structure, and finally the impact-resistant agent is prepared.

[0041] D3. Add the impact-resistant agent, 2,3-biphenyl maleic anhydride, dimethyl sulfoxide and aluminum chloride into the reactor, raise the temperature of the reactor to 150-170° C., and perform post-treatment to obtain the impact-resistant modifier.

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

[0043]

[0044] Where:

[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, and the epoxy group attacks the carbonyl carbon of the acid anhydride intermediate through a nucleophilic addition reaction to form a ring-opening product to obtain the impact modifier.

[0046] Furthermore, in step D1, the amount ratio of deionized water, sodium dodecyl sulfate, composite monomer and potassium persulfate is 80-100mL:4-5g:30-40g:2-3g, the composite monomer is obtained by mixing triallyl isocyanurate, triphenylethylene, 4-allyl-1,2-methylenedioxybenzene and 2-methyl-2-acrylic acid-1,2-ethylene glycol in a molar ratio of 3:1:1:2, and the post-treatment includes: after the reactor is cooled to room temperature, the reaction solution is added to a rotary evaporator with a water bath temperature of 80-100°C, and the reduced pressure distillation is carried out until no liquid is extracted to obtain a latex micronucleus.

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

[0048] Furthermore, in step D3, the amount ratio of the impact modifier, 2,3-biphenyl maleic anhydride, dimethyl sulfoxide and aluminum chloride is 8-10g:2-3g:30-40mL:0.8-1.2g, and the post-treatment includes: after the reaction is completed, after the temperature of the reaction liquid is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight, thereby obtaining an impact modifier.

[0049] The present invention also provides a method for preparing a wear-resistant and impact-resistant composite PVC material, comprising the following steps: uniformly mixing epoxy polyvinyl chloride, a plasticizer stabilizer, an impact modifier, a lubricant, a filler, an antioxidant and a heat stabilizer, adding the mixture to a twin-screw extruder, and 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-silicon dioxide, alumina and nano-zirconium oxide; the antioxidant is one or more of antioxidant 1010, triphenyl phosphite and dilauryl sulfide; the thermal 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 port toward the discharge port are 165°C, 170°C, 170°C, 175°C, 175°C, 180°C, and 180°C, respectively, and the main engine speed of the twin-screw extruder is 80-120rpm, and the pressure is 100-150bar.

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

[0053] 1. The present invention is to obtain epoxy polyvinyl chloride by dechlorinating and epoxidizing polyvinyl chloride. During the process of melt extrusion with a plasticizer stabilizer, an impact modifier and auxiliary materials, the modified plasticizer and the epoxy group inside the epoxy polyvinyl chloride cooperate with each other to open the ring during the high-temperature processing of polyvinyl chloride to generate free radicals, which are combined with the hydrogen chloride gas generated by the pyrolysis of polyvinyl chloride to hybridize the polyvinyl chloride chain segment, so that the polyvinyl chloride has a complex spatial structure and significantly enhances the wear resistance of the material. While the pyrolysis of polyvinyl chloride generates hydrogen chloride gas, the free radicals inside the chain segment react with the double bonds on the impact modifier to produce a Diels-Alder reaction to generate a ring structure, which significantly enhances the impact resistance of the material.

[0054] 2. The impact stabilizer prepared by the present invention has a stable core-shell structure. When the material is impacted, the structure absorbs the impact energy, which can effectively relieve the external force and prevent the material from brittle fracture, so that the material has better impact resistance. The structural design avoids the phase separation phenomenon caused by traditional impact stabilizers, and can be evenly dispersed inside the matrix and is not easy to agglomerate. During the combustion of composite polyvinyl chloride, the polyvinyl chloride chain segments are continuously pyrolyzed to produce acidic gas. When the impact stabilizer absorbs the acidic gas, the acidic gas destroys the core-shell structure of the plasticizer stabilizer, promotes the carbonization of the triazine rings inside and outside the core-shell structure, forms a molten carbon layer, and finally significantly enhances the flame retardant properties of the material.

[0055] 3. The plasticizer stabilizer prepared by the present invention is based on polyester chain segments. The molecular structure of polyester has high hardness and surface wear resistance. The impact resistance of the material is significantly improved during the blending process with polyvinyl chloride. During the high-temperature processing of polyvinyl chloride, the metal soap in the plasticizer stabilizer continuously absorbs the hydrogen chloride gas generated by high-temperature pyrolysis, thereby inhibiting the chain pyrolysis reaction of the polyvinyl chloride chain segments, further improving the wear resistance and impact resistance of the material, and generating metal chlorides that are evenly distributed inside the material, isolating heat while promoting the carbonization of the material, and consuming free radicals generated in the combustion chain reaction, thereby improving the flame retardant properties of the material. Compared with directly adding metal chlorides as flame retardants, this method makes the distribution of the material more uniform, not easy to agglomerate, thereby enhancing the wear resistance of the material. DETAILED DESCRIPTION

[0056] The technical scheme of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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, comprising the following steps:

[0059] Step 1: Preparation of modified plasticizer

[0060] Weigh: 300.0g of fumaric acid, 120.0g of 1,4-butenediol, 2.5L of dichlorobenzene and 12.0g of 98.0wt% concentrated sulfuric acid are added to a reactor, the temperature of the reactor is raised to 150°C, and the reaction is kept warm for 12 hours. After the reactor is cooled to room temperature, the reaction liquid is added to a rotary evaporator with a water bath temperature of 80°C, and the reaction liquid is distilled under reduced pressure until no liquid is produced to obtain a modified polyester, and the modified polyester is ground and sieved through a 200-mesh screen to obtain a modified polyester powder;

[0061] Weigh: 320.0g of modified polyester powder and 1.2L of formic acid are added to a reactor and stirred at a stirring rate of 80rpm. After stirring at room temperature for 10min, 36.0g of concentrated sulfuric acid is added dropwise to the reactor. The temperature of the reactor is raised to 50°C. 0.6L of 30.0wt% hydrogen peroxide solution is continued to be added dropwise to the reactor. The mixture is stirred for 1h at this temperature. After the reaction is completed, the temperature of the reaction liquid is lowered to room temperature, the reaction liquid 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 has a constant weight to obtain a modified plasticizer.

[0062] Step 2: Preparation of plasticizer stabilizer

[0063] Weigh: 200.0g of modified plasticizer and 1.0L of N,N-dimethylformamide are added to a reactor and stirred at a stirring rate of 80rpm. After the temperature of the reactor is raised to 80°C, a saturated sodium hydroxide solution is continuously added dropwise to the reactor to control the pH of the system to 9. The reaction is kept warm for 30min. After the reaction is completed, the temperature of the reaction liquid is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight to obtain a saponified plasticizer;

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

[0065] Weigh: 210.0g of saponified plasticizer and 1.0LN,N-dimethylformamide are added to the reactor and stirred. After the temperature of the reactor is raised to 80°C, saturated ammonia water is continuously added to the reactor to control the pH of the system to 9. 100.0g of modified powder is added to the reactor, and ammonia water is continuously added to control the pH of the system to 9. After the reaction is completed, after the temperature of the reaction liquid is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight to obtain a plasticizer stabilizer.

[0066] Step 3: Preparation of impact modifier

[0067] Mix triallyl isocyanurate, triphenylethylene, 4-allyl-1,2-methylenedioxybenzene and 2-methyl-2-acrylate-1,2-ethylene glycol in a molar ratio of 3:1:1:2 to obtain a composite monomer for later use;

[0068] Weigh: 4.0L deionized water and 200.0g sodium dodecyl sulfate are added to the reactor, and after nitrogen protection is introduced, 1.5kg of composite monomer is added to the reactor, and after stirring at room temperature for 10min, 100.0g of potassium persulfate is continuously added to the reactor, and the reaction is carried out at room temperature for 2h. After the reactor is cooled to room temperature, the reaction liquid is added to a rotary evaporator with a water bath temperature of 80°C, and the reaction liquid is distilled under reduced pressure until no liquid is produced to obtain latex micronuclei;

[0069] Weigh: 400.0g of latex micronucleus, 1.5L of deionized water and 80.0g of potassium persulfate are added to a reactor, nitrogen is introduced for protection, stirred at room temperature for 15min, and 200.0g of 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione is added to the reactor, the temperature of the reactor is increased to 70°C, and the reaction is kept warm for 30min. After the reaction is completed, the temperature of the reaction liquid is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight to obtain an impact resister;

[0070] Weigh: 400.0g of impact agent, 120.0g of 2,3-biphenyl maleic anhydride, 1.5L of dimethyl sulfoxide and 45.0g of aluminum chloride are added into a reactor, and the temperature of the reactor is raised to 150°C. After the reaction is completed, after the temperature of the reaction liquid drops to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight to obtain an impact modifier.

[0071] Step 4: Preparation of epoxy polyvinyl chloride

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

[0073] Weigh: 100.0g of polyvinyl chloride and 1.25L of dechlorination liquid are added to a high-pressure reactor lined with polytetrafluoroethylene, the high-pressure reactor is sealed and transferred to an oil bath, the temperature of the oil bath is raised to 120°C, and the reaction is kept warm for 1h. After the reaction is completed, after the temperature of the reaction liquid is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight, to obtain dechlorinated polyvinyl chloride;

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

[0075] Weigh: 200.0g of dechlorinated polyvinyl chloride and 1.0L of benzoic acid are added to the reactor and stirred. After the temperature of the reactor is raised to 50°C, 550.0mL of peroxide solution is added dropwise to the reactor, and the mixture is stirred for 1h. After the reaction is completed, the temperature of the reaction liquid is lowered to room temperature, the reaction liquid 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 has a constant weight to obtain epoxy polyvinyl chloride.

[0076] Step 5: Preparation of composite polyvinyl chloride

[0077] Weigh: 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-silicon dioxide, 20.0g of dilauryl sulfide and 20.0g of dibutyl tin dilaurate, mix well and add into a twin-screw extruder. The temperatures of the seven temperature sections of the twin-screw extruder from the feed port toward the discharge port are 165°C, 170°C, 170°C, 175°C, 175°C, 180°C, and 180°C, respectively. The main engine speed of the twin-screw extruder is 80rpm, the pressure is 100bar, and 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, comprising the following steps:

[0080] Step 1: Preparation of modified plasticizer

[0081] Weigh: 350.0g of fumaric acid, 120.0g of 1,4-butenediol, 2.4L of dichlorobenzene and 12.0g of 98.0wt% concentrated sulfuric acid are added to a reactor, the temperature of the reactor is raised to 170°C, and the reaction is kept warm for 16 hours. After the reactor is cooled to room temperature, the reaction liquid is added to a rotary evaporator with a water bath temperature of 100°C, and the reaction liquid is distilled under reduced pressure until no liquid is produced to obtain a modified polyester, and the modified polyester is ground and sieved through a 400-mesh screen to obtain a modified polyester powder;

[0082] Weigh: 320.0g of modified polyester powder and 1.5L of formic acid are added to a reactor and stirred at a stirring rate of 120rpm. After stirring at room temperature for 15min, 32.0g of concentrated sulfuric acid is added dropwise to the reactor. The temperature of the reactor is raised to 60°C. 0.6L of 30.0wt% hydrogen peroxide solution is continued to be added dropwise to the reactor. The reaction is stirred for 2h at this temperature. After the reaction is completed, the temperature of the reaction liquid is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight to obtain a modified plasticizer.

[0083] Step 2: Preparation of plasticizer stabilizer

[0084] Weigh: 240.0g of modified plasticizer and 1.2L of N,N-dimethylformamide are added to a reactor and stirred at a stirring rate of 120rpm. After the temperature of the reactor is raised to 90°C, a saturated sodium hydroxide solution is continuously added dropwise to the reactor to control the pH of the system to 10. The reaction is kept warm for 40min. After the reaction is completed, the temperature of the reaction liquid is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight to obtain a saponified plasticizer;

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

[0086] Weigh: 200.0g of saponified plasticizer and 1.2LN,N-dimethylformamide are added to the reactor and stirred. After the temperature of the reactor is raised to 90°C, saturated ammonia water is continuously added to the reactor to control the pH of the system to 10. 160.0g of modified powder is added to the reactor, and ammonia water is continuously added to control the pH of the system to 10. After the reaction is completed, after the temperature of the reaction liquid is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight to obtain a plasticizer stabilizer.

[0087] Step 3: Preparation of impact modifier

[0088] Mix triallyl isocyanurate, triphenylethylene, 4-allyl-1,2-methylenedioxybenzene and 2-methyl-2-acrylate-1,2-ethylene glycol in a molar ratio of 3:1:1:2 to obtain a composite monomer for later use;

[0089] Weigh: 5.0L deionized water and 250.0g sodium dodecyl sulfate are added to the reactor, and after nitrogen protection is introduced, 1.8kg of composite monomer is added to the reactor, and after stirring at room temperature for 15min, 120.0g of potassium persulfate is continuously added to the reactor, and the reaction is carried out at room temperature for 3h. After the reactor is cooled to room temperature, the reaction liquid is added to a rotary evaporator with a water bath temperature of 000°C, and the latex micronucleus is obtained by vacuum distillation until no liquid is produced;

[0090] Weigh: 500.0g of latex micronucleus, 2.0L of deionized water and 80.0g of potassium persulfate are added to a reactor, nitrogen is introduced for protection, stirred at room temperature for 20min, and 160.0g of 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione is added to the reactor, the temperature of the reactor is raised to 80°C, and the reaction is kept warm for 40min. After the reaction is completed, the temperature of the reaction liquid is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight to obtain an impact resister;

[0091] Weigh: 450.0g of impact agent, 120.0g of 2,3-biphenyl maleic anhydride, 2.0L of dimethyl sulfoxide and 60.0g of aluminum chloride are added into a reactor, and the temperature of the reactor is raised to 170°C. After the reaction is completed, after the temperature of the reaction liquid drops to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight to obtain an impact modifier.

[0092] Step 4: Preparation of epoxy polyvinyl chloride

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

[0094] Weigh: 180.0g of polyvinyl chloride and 2.5L of dechlorination liquid are added to a high-pressure reactor lined with polytetrafluoroethylene, the high-pressure reactor is sealed and transferred to an oil bath, the temperature of the oil bath is raised to 150°C, and the reaction is kept warm for 2 hours. After the reaction is completed, after the temperature of the reaction liquid is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight, to obtain dechlorinated polyvinyl chloride;

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

[0096] Weigh: 300.0g of dechlorinated polyvinyl chloride and 1.2L of benzoic acid are added to the reactor and stirred. After the temperature of the reactor is raised to 60°C, 600.0mL of peroxide solution is added dropwise to the reactor, and the mixture is stirred for 2h. After the reaction is completed, after the temperature of the reaction liquid is lowered to room temperature, the reaction liquid 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 has a constant weight to obtain epoxy polyvinyl chloride.

[0097] Step 5: Preparation of composite polyvinyl chloride

[0098] Weigh: 1000.0g epoxy polyvinyl chloride, 150.0g plasticizer stabilizer, 120.0g impact modifier, 20.0g calcium stearate, 100.0g nano-silicon dioxide, 30.0g dilauryl sulfide and 24.0g dibutyl tin dilaurate, mix well and add to a twin-screw extruder. The temperatures of the seven temperature sections of the twin-screw extruder from the feed port toward the discharge port are 165°C, 170°C, 170°C, 175°C, 175°C, 180°C, and 180°C, respectively. The main engine speed of the twin-screw extruder is 120rpm, the pressure is 150bar, and 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, comprising the following steps:

[0101] Step 1: Preparation of modified plasticizer

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

[0103] Weigh: 360.0g of modified polyester powder and 1.2L of formic acid are added to a reactor and stirred at a stirring rate of 100rpm. After stirring for 12min at room temperature, 36.0g of concentrated sulfuric acid is added dropwise to the reactor. The temperature of the reactor is raised to 60°C. 600.0mL of 30.0wt% hydrogen peroxide solution is continued to be added dropwise to the reactor. The mixture is stirred for 2h at this temperature. After the reaction is completed, the temperature of the reaction liquid is lowered to room temperature, the reaction liquid 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 has a constant weight to obtain a modified plasticizer.

[0104] Step 2: Preparation of plasticizer stabilizer

[0105] Weigh: 250.0g of modified plasticizer and 1.0L of N,N-dimethylformamide are added to a reactor and stirred at a stirring rate of 100rpm. After the temperature of the reactor is raised to 85°C, a saturated sodium hydroxide solution is continuously added dropwise to the reactor to control the pH of the system to 9.5. The reaction is kept warm for 36 minutes. After the reaction is completed, the temperature of the reaction liquid is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight to obtain a saponified plasticizer;

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

[0107] Weigh: 250.0g of saponified plasticizer and 1.1LN,N-dimethylformamide are added to the reactor and stirred. After the temperature of the reactor is raised to 85°C, saturated ammonia water is continuously added to the reactor to control the pH value of the system to 9.5. 150.0g of modified powder is added to the reactor, and ammonia water is continuously added to control the pH value of the system to 9.5. After the reaction is completed, after the temperature of the reaction liquid is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight to obtain a plasticizer stabilizer.

[0108] Step 3: Preparation of impact modifier

[0109] Mix triallyl isocyanurate, triphenylethylene, 4-allyl-1,2-methylenedioxybenzene and 2-methyl-2-acrylate-1,2-ethylene glycol in a molar ratio of 3:1:1:2 to obtain a composite monomer for later use;

[0110] Weigh: 4.5L deionized water and 225.0g sodium dodecyl sulfate are added to the reactor, and after nitrogen protection is introduced, 1.75kg of the composite monomer is added to the reactor, and after stirring at room temperature for 12 minutes, 250.0g of potassium persulfate is continuously added to the reactor, and the reaction is carried out at room temperature for 2 hours. After the reactor is cooled to room temperature, the reaction liquid is added to a rotary evaporator with a water bath temperature of 90°C, and the reaction liquid is distilled under reduced pressure until no liquid is produced to obtain latex micronuclei;

[0111] Weigh: 450.0g of latex micronucleus, 1.6L of deionized water and 80.0g of potassium persulfate are added to a reactor, nitrogen is introduced for protection, stirred at room temperature for 18min, and 200.0g of 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione is added to the reactor, the temperature of the reactor is increased to 75°C, and the reaction is kept warm for 36min. After the reaction is completed, the temperature of the reaction liquid is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight to obtain an impact resister;

[0112] Weigh: 450.0g of impact agent, 125.0g of 2,3-biphenyl maleic anhydride, 1.75L of dimethyl sulfoxide and 50.0g of aluminum chloride are added into a reactor, and the temperature of the reactor is raised to 160°C. After the reaction is completed, after the temperature of the reaction liquid drops to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight to obtain an impact modifier.

[0113] Step 4: Preparation of epoxy polyvinyl chloride

[0114] Weigh: 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 liquid are added to a high-pressure reactor lined with polytetrafluoroethylene, the high-pressure reactor is sealed and transferred to an oil bath, the temperature of the oil bath is raised to 135°C, and the reaction is kept warm for 2 hours. After the reaction is completed, after the temperature of the reaction liquid is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a drying oven at a temperature of 60°C and vacuum dried until the filter cake has a constant weight, to obtain dechlorinated polyvinyl chloride;

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

[0117] Weigh: 250.0g of dechlorinated polyvinyl chloride and 1.2L of benzoic acid are added to the reactor and stirred. After the temperature of the reactor is raised to 55°C, 550.0mL of peroxide solution is added dropwise to the reactor, and the mixture is stirred for 2 hours at this temperature. After the reaction is completed, the temperature of the reaction liquid is lowered to room temperature, the reaction liquid 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 has a constant weight to obtain epoxy polyvinyl chloride.

[0118] Step 5: Preparation of composite polyvinyl chloride

[0119] Weigh: 960.0g epoxy polyvinyl chloride, 120.0g plasticizer stabilizer, 100.0g impact modifier, 10.0g calcium stearate, 80.0g nano-silicon dioxide, 25.0g dilauryl sulfide and 25.0g dibutyl tin dilaurate, mix well and add to a twin-screw extruder. The temperatures of the seven temperature sections of the twin-screw extruder from the feed port toward the discharge port are 165°C, 170°C, 170°C, 175°C, 175°C, 180°C, and 180°C, respectively. The main engine speed of the twin-screw extruder is 100rpm, the pressure is 125bar, and 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 1, the process of preparing the modified plasticizer is omitted, and in step 2, an equal amount of modified polyester powder is used to replace the modified plasticizer.

[0122] Comparative Example 2

[0123] The difference between this comparative example and Example 9 is that in step 2, the process of preparing the plasticizer stabilizer is omitted, and in step 5, 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 3, the process of preparing the impact modifier is eliminated, and in step 5, an equal amount of the 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 4, the process of preparing epoxy polyvinyl chloride is omitted, and in step 5, an equal amount of dechlorinated polyvinyl chloride is used to replace epoxy polyvinyl chloride.

[0128] Performance Test:

[0129] The volume abrasion loss of the composite polyvinyl chloride prepared in Examples 1-3 and Comparative Examples 1-3 was tested with reference to the standard GB / T 9867-2008 "Determination of wear resistance of vulcanized rubber or thermoplastic rubber (rotating roller abrader method)";

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

[0131] The acidity of the gas released by the combustion of the composite polyvinyl chloride prepared in Examples 1-3 and Comparative Examples 1-3 was tested with reference to the standard GB / T 32129-2015 "Halogen-free low-smoke flame-retardant cable materials for wires and cables";

[0132] The vertical combustion grade of the composite polyvinyl chloride prepared in Examples 1-3 and Comparative Examples 1-3 was determined with reference to the standard GB / T 2408-2021 "Horizontal and vertical methods for determination of combustion performance of plastics";

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

[0134] Table 1-Performance data of each sample

[0135]

[0136]

[0137] Data Analysis:

[0138] Comparing and analyzing the data in Table 1 above, the Izod impact strength of the composite polyvinyl chloride prepared by the present invention is 42.5 kJ·m -2 , volume wear 29.8mm 3, the combustion gas is acidic (HCl content is 4.7%), the vertical combustion grade is V-0 and the limiting oxygen index is 34.8%, all the data are better than the comparative example;

[0139] By comparing the data of Example 3 and Comparative Examples 1-4, it can be found that the modified plasticizer obtained by epoxidation of the modified polyester has a large number of epoxy groups inside, which cooperate with the epoxy groups inside the epoxy polyvinyl chloride. During the high-temperature processing of polyvinyl chloride, the free radicals generated by ring opening are combined with the hydrogen chloride gas generated by the pyrolysis of polyvinyl chloride to hybridize the polyvinyl chloride chain segment, so that it has a complex spatial structure, which significantly enhances the wear resistance of the material. While the polyvinyl chloride is pyrolyzed to produce hydrogen chloride gas, the free radicals inside the chain segment react with the double bonds on the impact modifier to produce a Diels-Alder structure, which significantly enhances the impact resistance of the material; and, during the combustion of the composite polyvinyl chloride, the polyvinyl chloride chain segment continuously undergoes pyrolysis to produce acidic gas. While the plasticizer stabilizer absorbs the acidic gas, the acidic gas destroys the core-shell structure of the plasticizer stabilizer, promotes the carbonization of the triazine rings of the core-shell structure inside and outside, forms a molten carbon layer, and finally significantly enhances the flame retardant performance of the material.

[0140] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A wear-resistant and impact-resistant composite PVC material, characterized in that: The material composition comprises the following parts by weight: 80-100 parts of epoxy polyvinyl chloride, 10-15 parts of plasticizer stabilizer, 10-12 parts of impact modifier, 0.5-2 parts of lubricant, 5-10 parts of filler, 2-3 parts of antioxidant and 2-3 parts of heat stabilizer; Wherein, the preparation method of epoxy polyvinyl chloride comprises the following steps: A1. Add polyvinyl chloride and dechlorination liquid into a high-pressure reactor lined with polytetrafluoroethylene, seal the high-pressure reactor and transfer it to an oil bath, raise the temperature of the oil bath to 120-150° C., keep the temperature for 1-2 hours, and post-treat to obtain dechlorinated polyvinyl chloride; A2. Add dechlorinated polyvinyl chloride and benzoic acid into a reactor and stir. After the temperature of the reactor rises to 50-60°C, add peroxide solution dropwise into the reactor, keep warm and stir for 1-2 hours, and obtain epoxy polyvinyl chloride by post-treatment.

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

3. The wear-resistant and impact-resistant composite PVC material according to claim 1, characterized in that: The preparation method of the plasticizer stabilizer comprises the following steps: B1. Add the modified plasticizer and N,N-dimethylformamide into the reactor and stir. After the temperature of the reactor is raised to 80-90°C, continuously drop saturated sodium hydroxide solution into the reactor to control the pH of the system to 9-10. Keep the temperature for 30-40 minutes and perform post-treatment to obtain a saponified plasticizer. B2. Add saponified plasticizer and N,N-dimethylformamide into the reactor and stir. After the temperature of the reactor is raised to 80-90°C, continue to drip saturated ammonia water into the reactor to control the pH value of the system to 9-10. Add modified powder into the reactor and continue to drip ammonia water to control the pH value of the system to 9-10. Post-process to obtain the plasticizer stabilizer.

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

5. The wear-resistant and impact-resistant composite PVC material according to claim 3, characterized in that: The preparation method of the modified plasticizer comprises the following steps: C1, adding fumaric acid, 1,4-butenediol, dichlorobenzene and 98.0wt% concentrated sulfuric acid into a reactor, raising the temperature of the reactor to 150-170°C, keeping the temperature for reaction for 12-16h, and post-treating to obtain modified polyester powder; C2. Add the modified polyester powder and formic acid into a reactor and stir. After stirring for 10-15 minutes at room temperature, add concentrated sulfuric acid dropwise into the reactor. The temperature of the reactor is raised to 50-60°C. Continue to add 30.0wt% hydrogen peroxide solution dropwise into the reactor. Keep warm and stir for 1-2 hours. Post-treat to obtain a modified plasticizer.

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

7. The wear-resistant and impact-resistant composite PVC material according to claim 1, characterized in that: The method for preparing the impact modifier comprises the following steps: D1. Deionized water and sodium dodecyl sulfate are added to a reactor, and after nitrogen protection is introduced, the composite monomer is added to the reactor, and after stirring at room temperature for 10-15 minutes, potassium persulfate is continuously added to the reactor, and the reaction is carried out at room temperature for 2-3 hours, and latex micronuclei are obtained by post-treatment; D2, adding latex micronuclei, deionized water and potassium persulfate into a reactor, introducing nitrogen protection, stirring at room temperature for 15-20 minutes, adding 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione into the reactor, raising the temperature of the reactor to 70-80°C, keeping the temperature for reaction for 30-40 minutes, and post-treating to obtain an impact-resistant agent; D3. Add the impact-resistant agent, 2,3-biphenyl maleic anhydride, dimethyl sulfoxide and aluminum chloride into the reactor, raise the temperature of the reactor to 150-170° C., and perform post-treatment to obtain the impact-resistant modifier.

8. The wear-resistant and impact-resistant composite PVC material according to claim 7, characterized in that: In step D1, the amount ratio of deionized water, sodium dodecyl sulfate, composite monomer and potassium persulfate is 80-100mL:4-5g:30-40g:2-3g, and the composite monomer is obtained by mixing triallyl isocyanurate, triphenylethylene, 4-allyl-1,2-methylenedioxybenzene and 2-methyl-2-acrylic acid-1,2-ethylene glycol in a molar ratio of 3:1:1:2; in step D2, the latex micronucleus, deionized water, sodium dodecyl sulfate, composite monomer and potassium persulfate are used in a ratio of 80-100mL:4-5g:30-40g:2-3g. The dosage ratio of potassium sulfate and 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione is 8-10g:30-50mL:1-2g:3-5g; in step D3, the dosage ratio of impact agent, 2,3-biphenyl maleic anhydride, dimethyl sulfoxide and aluminum chloride is 8-10g:2-3g:30-40mL:0.8-1.2g.

9. A method for preparing the wear-resistant and impact-resistant composite PVC material according to any one of claims 1 to 8, characterized in that: The following steps are involved: Epoxy polyvinyl chloride, plasticizer stabilizer, impact modifier, lubricant, filler, heat stabilizer, antioxidant and heat stabilizer are mixed evenly and added into a twin-screw extruder for melt extrusion to obtain composite polyvinyl chloride.

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