High-wear-resistant antistatic plastic based on CPVC modification and preparation method of high-wear-resistant antistatic plastic

Abstract

The invention discloses CPVC (Chlorinated Polyvinyl Chloride) modification-based high-wear-resistance antistatic plastic and a preparation method thereof, belongs to the technical field of composite CPVC preparation, and aims to solve the technical problem that the wear resistance and the antistatic property of CPVC-based plastic in the prior art need to be further improved. The high-wear-resistant antistatic plastic based on CPVC modification comprises the following raw materials in parts by weight: 80-100 parts of modified CPVC, 6-8 parts of a modified heat stabilizer and 8-16 parts of an auxiliary material, the amino group on the surface of the prepared antistatic filler participates in the ammoniation process of the prepared CPVC, a large number of amino groups hybridize the chain segment structure of the CPVC and introduce tertiary amino groups, and an ion structure is introduced into the hybridized CPVC through quaternary ammonium salinization to obtain the modified CPVC. The CPVC-based plastic is obtained by mixing, melting and extruding the CPVC-based plastic, the prepared polyamide acid-based modified heat stabilizer and auxiliary materials.

Description

Technical Field

[0001] The invention relates to the technical field of composite CPVC preparation, and in particular to a highly wear-resistant and antistatic plastic based on CPVC modification and a preparation method thereof. Background Art

[0002] With the increasing demand for high-performance engineering plastics, the research and application of CPVC materials in terms of wear resistance and antistatic properties have also continued to deepen. Early CPVC plastics mainly relied on their high thermal stability and mechanical strength to play a fundamental role in fields such as construction and chemical pipelines. However, faced with complex high-friction working conditions, their wear resistance has gradually become a bottleneck restricting their application expansion. To this end, researchers have significantly improved their surface hardness and wear life by introducing rigid fillers, nano-reinforcements and lubricating modifiers, enabling them to exhibit better performance in fields such as conveying systems and wear parts. At the same time, as electronics, semiconductors and precision manufacturing place higher demands on the antistatic ability of materials, the antistatic modification of CPVC has also become a research hotspot. Overall, CPVC is steadily evolving from a "structural material" to a "functional composite material", showing broad development prospects.

[0003] While CPVC-based materials currently offer advantages in heat resistance and chemical stability, performance bottlenecks are gradually emerging when faced with more demanding or multifunctional applications. For example, under dynamic loads such as continuous friction and high-speed impact, existing materials struggle to maintain surface structural integrity, resulting in fluctuations in wear rate control. Microscopic failures such as scratches and fatigue damage are common on the surface during long-term use. Conventional modification methods for antistatic protection rely primarily on the addition of conductive fillers, but issues such as uneven conductive phase distribution and unstable conductive paths remain prominent. This is particularly true in complex environments such as humid, hot, and dusty environments, where the antistatic effect readily fades, making it difficult to achieve long-lasting and consistent antistatic protection.

[0004] At the same time, with the deepening promotion of green manufacturing and sustainable development concepts, the environmental adaptability of materials has also received more and more attention. CPVC has relatively poor thermal stability during processing and service. It is easy to decompose when heated and release corrosive or harmful gases such as hydrogen chloride, which not only affects its subsequent processing performance, but also may pose hidden dangers to the production environment and use safety. This pyrolysis characteristic is particularly obvious under extreme conditions such as high temperature and high shear, which not only limits its applicability in some advanced manufacturing scenarios, but also to a certain extent increases the regulatory pressure on environmental protection and safety.

[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 highly wear-resistant and antistatic plastic based on CPVC modification and a preparation method thereof, so as to solve the technical problem in the prior art that the wear resistance and antistatic properties of CPVC-based plastics need to be further improved.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A highly wear-resistant and antistatic plastic based on modified CPVC comprises the following raw materials in parts by weight: 80-100 parts of modified CPVC, 6-8 parts of modified heat stabilizer, and 8-16 parts of auxiliary materials;

[0009] The auxiliary materials include the following raw materials in parts by weight: 5-10 parts of plasticizer, 1-2 parts of antioxidant, 1-2 parts of light stabilizer and 1-2 parts of lubricant;

[0010] Furthermore, the plasticizer is one or both of dioctyl phthalate and tributyl citrate; the antioxidant is one or both of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and tris(2,4-di-tert-butylphenyl) phosphate; the light stabilizer is one or both of 2-hydroxy-4-octyloxybenzophenone and bis(2,2,6,6-tetramethylpiperidinyl)sebacate; and the lubricant is one or more of calcium stearate, oxidized polyethylene wax and montan wax.

[0011] The modified CPVC preparation method comprises: adding hybrid CPVC and N,N-dimethylformamide into a reactor, introducing nitrogen protection, raising the temperature of the reactor to 100-110° C., and stirring at this temperature for 20-25 minutes. Then, triethylamine is added to the reactor, and stirring at this temperature is continued for 5-8 minutes. Then, a modification liquid is added dropwise to the reactor, and the addition is continued for 1-2 hours. The mixture is stirred at this temperature for 3-4 hours, and post-processed to obtain the modified CPVC.

[0012] The reaction principle for preparing modified CPVC is as follows: ethyl bromide is activated through coordination effect under the catalysis of triethylamine. The tertiary amino group on the hybrid CPVC acts as a nucleophilic reagent and undergoes a nucleophilic substitution reaction with the ethyl bromide in the modification solution. The carbon atom of the ethyl bromide is attacked by the tertiary amino group, breaking the carbon-bromine bond to form a quaternary ammonium salt structure, thereby preparing the modified CPVC.

[0013] Furthermore, in the process of preparing the modified CPVC, the hybrid CPVC, N,N-dimethylformamide, triethylamine and modifying liquid are used in a ratio of 5-7 g:30-36 mL:0.5-0.8 g:10-12 mL, wherein the modifying liquid is obtained by mixing ethyl bromide and N,N-dimethylformamide in a ratio of 1-2 g:10-12 mL. The post-treatment includes: after the reaction is completed, the temperature of the reactor is lowered to room temperature, the reaction liquid is transferred to a rotary evaporator at a temperature of 100-110° C., and evaporated under reduced pressure until no liquid is recovered to obtain the modified CPVC.

[0014] Furthermore, the preparation method of hybrid CPVC comprises the following steps:

[0015] A1. Add PVC powder, deionized water, talc, and benzoyl peroxide to a reactor. After nitrogen is introduced to expel the air, the gas in the reactor is extracted using a vacuum pump until the pressure drops to a negative pressure of 0.1 MPa. Then, chlorine is introduced into the reactor to control the internal pressure to 0.3 MPa. The reactor is sealed and the temperature of the reactor is continuously raised to 85-95°C. The reaction is maintained at this temperature for 5-7 hours, and CPVC is obtained by post-processing.

[0016] A2. Add CPVC and N,N-dimethylacetamide into a reactor, raise the temperature of the reactor to 80-90°C, keep stirring for 1-2 hours, add antistatic filler into the reactor, continue keeping stirring for 3-4 hours, and perform post-treatment to obtain hybrid CPVC.

[0017] The reaction equation for preparing hybrid CPVC is:

[0018]

[0019] Where: Indicates antistatic filler.

[0020] The reaction principle for preparing hybrid CPVC is as follows: Benzoyl peroxide generates active free radicals under heating conditions, which attack the active α-hydrogen in polyvinyl chloride to generate free radicals. The free radicals further react with chlorine under high pressure, thereby introducing a large number of chlorine groups on the polyvinyl chloride chain segments, thereby preparing CPVC. The amino groups on the antistatic filler act as strong nucleophiles, attacking the carbon atoms in the CPVC main chain, replacing the chlorine groups, thereby preparing hybrid CPVC.

[0021] Furthermore, in step A1, the amount ratio of the PVC powder, deionized water, talc and benzoyl peroxide is 2-3 g:10-12 mL:0.2 g:0.3-0.5 g, and the post-treatment includes: after the reaction is completed, the temperature of the reactor is lowered to room temperature, the reaction system is adjusted to neutrality with saturated sodium hydroxide, the filter cake is collected by suction filtration from the reactor, and after washing with anhydrous ethanol and deionized water 3-5 times, the filter cake is transferred to a vacuum drying oven at a temperature of 60° C. and vacuum dried to constant weight to obtain CPVC;

[0022] Furthermore, in step A2, the CPVC, N,N-dimethylacetamide, and antistatic filler are used in a ratio of 8-10 g:100 mL:1-2 g. Post-treatment includes: after the reaction is completed, the temperature of the reactor is lowered to room temperature, the reaction system is adjusted to neutrality using saturated sodium hydroxide, and the reaction solution is transferred to a rotary evaporator at a temperature of 100-110° C. and evaporated under reduced pressure until no liquid is recovered to obtain hybrid CPVC.

[0023] Furthermore, the preparation method of the antistatic filler comprises the following steps:

[0024] B1. Add graphene oxide, deionized water, and anhydrous ethanol to a reactor and stir. After the temperature of the reactor is raised to 60-80° C., add tris(2-aminoethyl)amine to the reactor and keep the temperature to react for 40-60 minutes. Post-process to obtain ammoniated graphene.

[0025] The reaction principle for preparing ammoniated graphene is as follows: under heating conditions, the primary amino group of tri(2-aminoethyl)amine acts as a nucleophile to attack the epoxy group on the surface of graphene oxide. The nitrogen atom of the amino group attacks the α-carbon of the epoxy group, breaking the CO bond and forming a β-hydroxyamine structure, thereby preparing ammoniated graphene.

[0026] B2. Add the ammoniated graphene and deionized water into a high-pressure reactor, add zinc nitrate into the high-pressure reactor under stirring, and after the addition is completed, use a saturated sodium hydroxide aqueous solution to adjust the pH of the reaction system to 8-10. After stirring for 20-30 minutes, seal the high-pressure reactor and increase the temperature of the high-pressure reactor to 140-160° C., keep the reaction warm for 10-12 hours, and post-treat to obtain an antistatic filler.

[0027] The reaction principle for preparing ammoniated graphene is as follows: under hydrothermal conditions, the oxygen-containing functional groups of graphene oxide are partially removed through thermally induced decomposition or the action of water molecules, restoring the carbon network; at the same time, zinc nitrate dissociates in an alkaline environment to generate zinc ions, which react with water to form zinc hydroxide intermediates, which are then dehydrated to generate zinc oxide nanoparticles. The zinc ions coordinate with the amino, hydroxyl or carboxyl groups on the surface of the ammoniated graphene, guiding the deposition of zinc oxide on the graphene surface, thereby preparing an antistatic filler.

[0028] Furthermore, in step B1, the amount ratio of graphene oxide, deionized water, anhydrous ethanol and tris(2-aminoethyl)amine is 4-5 g:10-12 mL:10-12 mL:1-2 g, and the post-treatment includes: after the reaction is completed, the reactor is cooled to room temperature, centrifuged at 8000 rpm for 10 minutes using a centrifuge, and the supernatant is discarded and the precipitate is washed with deionized water and anhydrous ethanol 3-5 times. Finally, the washed precipitate is placed in a vacuum drying oven and dried at 80°C for 12 hours to obtain ammoniated graphene.

[0029] Furthermore, in step B2, the ratio of ammoniated graphene, deionized water and zinc nitrate is 4-5g:24-30mL:1g, and the post-treatment includes: after the reaction is completed, the reactor is cooled to room temperature, centrifuged at 8000rpm for 10min using a centrifuge, the supernatant is discarded, and the precipitate is washed 3-5 times with deionized water and anhydrous ethanol, and finally the washed precipitate is placed in a vacuum drying oven and dried at 80°C for 12h to obtain an antistatic filler.

[0030] Furthermore, the preparation method of the modified thermal stabilizer comprises the following steps:

[0031] C1. Add 6-methyl-1,3,5-triazine-2,4-diamine and N,N-dimethylformamide to a reactor at a temperature of 0-5°C, keep warm and stir until the reactants are completely dissolved, add a calculated amount of 4,4'-oxydiphthalic anhydride to the reactor, and after the addition is complete, steadily raise the temperature of the reactor to 30-50°C, keep warm and react for 2-4 hours, add a capping agent to the reactor, keep warm for 20-30 minutes, and post-treat to obtain a modified polyamic acid;

[0032] The reaction equation for preparing modified polyamic acid is:

[0033]

[0034] Where:

[0035] The reaction principle for preparing modified polyamic acid is as follows: the two primary amino groups of 6-methyl-1,3,5-triazine-2,4-diamine act as nucleophiles to attack the carbonyl carbon of 4,4'-oxydiphthalic anhydride, causing a nucleophilic addition ring-opening reaction, breaking the anhydride ring to form an amide bond and a carboxyl group, and generating a polyamic acid backbone through step-by-step polymerization; subsequently, the amino group of (3-aminopropyl) diethyl phosphate reacts with the terminal anhydride or carboxyl group to cap the polyamic acid chain and introduce a phosphorus side chain, thereby preparing the modified polyamic acid.

[0036] C2. Add modified polyamic acid and N,N-dimethylformamide into the reactor and stir. After the temperature of the reactor is raised to 70-90°C, use saturated sodium hydroxide aqueous solution to adjust the pH of the reaction system to 8-10, add the composite modification liquid into the reactor, keep the temperature for reaction for 2-3 hours, and post-treat to obtain the modified thermal stabilizer.

[0037] The reaction principle for preparing the modified thermal stabilizer is as follows: the carboxyl group of the modified polyamic acid dissociates into carboxylate under alkaline conditions, and forms a metal-carboxylate complex structure through coordination bonds with the calcium ions generated by the dissociation of calcium chloride and the zinc ions generated by the dissociation of zinc nitrate in the composite modification solution. The calcium ions and zinc ions respectively coordinate with the oxygen atoms of the carboxyl group to form a stable complex structure to obtain the modified thermal stabilizer.

[0038] Furthermore, in step C1, the amount ratio of 6-methyl-1,3,5-triazine-2,4-diamine, N,N-dimethylformamide and the end-capping agent is 4-5g:30-36mL:0.3-0.5g, wherein the amount of 4,4'-oxydiphthalic anhydride is 1.1-1.2 times the molar amount of 6-methyl-1,3,5-triazine-2,4-diamine, and the end-capping agent is (3-aminopropyl) diethyl phosphate. The post-treatment includes: after the reaction is completed, the temperature of the reactor is lowered to room temperature, the reaction solution is transferred to a rotary evaporator at a temperature of 100-110°C, and evaporated under reduced pressure until no liquid is recovered to obtain a modified polyamic acid;

[0039] Furthermore, in step C2, the modified polyamic acid, N,N-dimethylformamide and composite modification liquid are used in a ratio of 4-5g:20-24mL:10-12mL, wherein the composite modification liquid is obtained by mixing calcium chloride, zinc nitrate and deionized water in a ratio of 1-2g:1-2g:10-12mL. The post-treatment includes: after the reaction is completed, the temperature of the reactor is lowered to room temperature, the reaction liquid is transferred to a rotary evaporator at a temperature of 100-110°C, and evaporated under reduced pressure until no liquid is recovered to obtain a modified thermal stabilizer.

[0040] The present invention also discloses a method for preparing a highly wear-resistant and antistatic plastic based on CPVC modification. The method comprises the following steps: adding modified CPVC, a modified heat stabilizer, a plasticizer, an antioxidant, a light stabilizer and a lubricant into a twin-screw extruder, melt-extruding, and naturally curing to obtain a CPVC-based plastic.

[0041] Furthermore, the temperatures of the seven temperature zones of the twin-screw extruder from the feed port to the discharge port are 180°C, 185, 185°C, 190°C, 190°C, 200°C, and 200°C, respectively. The main engine speed of the twin-screw extruder is 120-160rpm, and the pressure is 80-120bar.

[0042] The present invention has the following beneficial effects:

[0043] 1. The chlorination of PVC by the present invention not only enhances the heat resistance and mechanical strength of PVC, but also improves its reactivity to amino groups on the surface of functionalized antistatic fillers, thereby significantly accelerating the amination rate of the filler. The effective introduction of amino groups into the CPVC chain segments realizes the synergistic hybridization of the organic main chain and the inorganic filler, which not only improves the interfacial binding ability but also provides a chemical basis for the introduction of quaternary ammonium salt structures, further enhancing the antistatic performance and chain segment stability of the material. In addition, the modified thermal stabilizer prepared by the present invention forms a stable metal-carboxylate complex network under alkaline conditions by introducing a phosphorus-terminated polyamic acid structure and combining metal ions such as calcium and zinc. The complex network can be uniformly dispersed in the CPVC matrix during the melt extrusion process. On the one hand, it cooperates with the zinc oxide particles dispersed in the antistatic filler to inhibit the thermal degradation reaction that occurs during the processing after chlorination, thereby enhancing the thermal stability of the system. On the other hand, it constructs a mechanical skeleton with a buffering effect at the microscopic level, thereby significantly improving the wear resistance of the material.

[0044] 2. The CPVC prepared by the present invention improves the matrix performance through the chlorination process. Combined with the unique structure of the antistatic filler, the antistatic filler is firmly embedded in the polymer chain segment, forming a high-density polar group network. The antistatic filler is loaded with zinc oxide particles on the surface of the graphene oxide through a hydrothermal reduction process, thereby improving the electron conduction efficiency. Rapid discharge can be achieved in the early stage of charge accumulation to build an efficient conductive network, significantly enhancing the conductivity of the material. The amino groups on the filler surface participate in the amination process of the CPVC, replacing some chlorine atoms and introducing a quaternary ammonium salt structure, providing the ability to provide a durable conductive channel, effectively adsorbing water molecules in the air and forming a conductive path, thereby continuously releasing or neutralizing accumulated static charges and promoting rapid charge dispersion. The modified thermal stabilizer uses polyamic acid as a base and forms a stable ion conduction path through the uniform coordination of metal salt ions, further assisting charge migration and optimizing the connectivity of the conductive network, thereby significantly improving the conductive properties of the material and improving the antistatic properties of the material.

[0045] 3. The CPVC prepared by the present invention enhances the thermal stability of the molecular chain through a chlorination process. Its high chlorine content releases hydrogen halide at high temperatures, inhibiting flame propagation. The antistatic filler is loaded with functional particles on the surface of graphene oxide through a hydrothermal reduction process, reinforcing the flame-retardant base of the material. The modified thermal stabilizer is based on polyamic acid, and the introduced phosphorus structure is formed in the molecular chain through a capping process. The phosphorus group decomposes to form phosphoric acid during combustion, catalyzing the formation of a carbonized layer, blocking oxygen and heat transfer. At the same time, the coordination and complexation of metal salt ions enhances thermal stability and further promotes the formation of non-flammable carbon residue. The modified thermal stabilizer forms a stable complex reaction with hydrogen chloride molecules, systematically interrupting the continuity of the chain dechlorination reaction during pyrolysis, thereby suppressing the continuous generation of hydrogen chloride at the source. This multi-inhibition strategy not only reduces gas diffusion through a physical barrier but also consumes reactive sites through chemical bonding, ensuring a significant reduction in hydrogen chloride release, thereby effectively reducing its potential harm to environmental pollution and human health and safety. DETAILED DESCRIPTION

[0046] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] The PVC powder used in the present invention was purchased from Shanghai Maclean Biochemical Technology Co., Ltd. with the item number P708201; the graphene oxide used in the present invention was purchased from Shanghai Maclean Biochemical Technology Co., Ltd. with the item number S926158; the calcium stearate used in the present invention was purchased from Shanghai Maclean Biochemical Technology Co., Ltd. with the item number C805417-1kg.

[0048] Example 1

[0049] This embodiment provides a method for preparing an antistatic filler for use in preparing highly wear-resistant antistatic plastics based on CPVC modification, comprising the following steps:

[0050] Step 1: Preparation of ammoniated graphene

[0051] Weigh: 40.0 g of graphene oxide, 100.0 mL of deionized water and 100.0 mL of anhydrous ethanol were added to the reactor and stirred. After the temperature of the reactor was raised to 60 ° C, 10.0 g of tris (2-aminoethyl) amine was added to the reactor and kept warm for 40 minutes. After the reaction was completed, the reactor was cooled to room temperature and centrifuged at 8000 rpm for 10 minutes. After discarding the supernatant, the precipitate was washed 3 times with deionized water and anhydrous ethanol. Finally, the washed precipitate was placed in a vacuum drying oven and dried at 80 ° C for 12 hours to obtain ammoniated graphene.

[0052] Step 2: Preparation of antistatic filler

[0053] Weigh: 40.0g of ammoniated graphene and 240.0mL of deionized water were added to a high-pressure reactor, and 10.0g of zinc nitrate was added to the high-pressure reactor under stirring. After the addition was completed, the pH of the reaction system was adjusted to 8 using a saturated sodium hydroxide aqueous solution. After stirring for 20 minutes, the high-pressure reactor was sealed and the temperature of the high-pressure reactor was raised to 140°C. The reaction was kept warm for 10 hours. After the reaction was completed, the reactor was cooled to room temperature and centrifuged at 8000rpm for 10 minutes using a centrifuge. After discarding the supernatant, the precipitate was washed 3 times with deionized water and anhydrous ethanol. Finally, the washed precipitate was placed in a vacuum drying oven and dried at 80°C for 12 hours to obtain an antistatic filler.

[0054] Example 2

[0055] This embodiment provides a method for preparing an antistatic filler for use in preparing highly wear-resistant antistatic plastics based on CPVC modification, comprising the following steps:

[0056] Step 1: Preparation of ammoniated graphene

[0057] Weigh: 50.0 g of graphene oxide, 120.0 mL of deionized water and 120.0 mL of anhydrous ethanol were added to a reactor and stirred. After the temperature of the reactor was raised to 80° C., 20.0 g of tris(2-aminoethyl)amine was added to the reactor and kept warm for 60 minutes. After the reaction was completed, the reactor was cooled to room temperature and centrifuged at 8000 rpm for 10 minutes. The supernatant was discarded and the precipitate was washed 5 times with deionized water and anhydrous ethanol. Finally, the washed precipitate was placed in a vacuum drying oven and dried at 80° C. for 12 hours to obtain ammoniated graphene.

[0058] Step 2: Preparation of antistatic filler

[0059] Weigh: 50.0g of ammoniated graphene and 300.0mL of deionized water were added to a high-pressure reactor, and 10.0g of zinc nitrate was added to the high-pressure reactor under stirring. After the addition was completed, the pH of the reaction system was adjusted to 10 using a saturated sodium hydroxide aqueous solution. After stirring for 30 minutes, the high-pressure reactor was sealed and the temperature of the high-pressure reactor was raised to 160°C. The reaction was kept warm for 12 hours. After the reaction was completed, the reactor was cooled to room temperature and centrifuged at 8000rpm for 10 minutes using a centrifuge. The supernatant was discarded and the precipitate was washed 5 times with deionized water and anhydrous ethanol. Finally, the washed precipitate was placed in a vacuum drying oven and dried at 80°C for 12 hours to obtain an antistatic filler.

[0060] Example 3

[0061] This embodiment provides a method for preparing an antistatic filler for use in preparing highly wear-resistant antistatic plastics based on CPVC modification, comprising the following steps:

[0062] Step 1: Preparation of ammoniated graphene

[0063] Weigh: 45.0 g of graphene oxide, 120.0 mL of deionized water and 100.0 mL of anhydrous ethanol were added to a reactor and stirred. After the temperature of the reactor was raised to 70 ° C, 16.0 g of tris(2-aminoethyl)amine was added to the reactor and kept warm for 50 minutes. After the reaction was completed, the reactor was cooled to room temperature and centrifuged at 8000 rpm for 10 minutes. After discarding the supernatant, the precipitate was washed 4 times with deionized water and anhydrous ethanol. Finally, the washed precipitate was placed in a vacuum drying oven and dried at 80 ° C for 12 hours to obtain ammoniated graphene.

[0064] Step 2: Preparation of antistatic filler

[0065] Weigh: 45.0g of ammoniated graphene and 270.0mL of deionized water were added to a high-pressure reactor, and 10.0g of zinc nitrate was added to the high-pressure reactor under stirring. After the addition was completed, the pH of the reaction system was adjusted to 9 using a saturated sodium hydroxide aqueous solution. After stirring for 25 minutes, the high-pressure reactor was sealed and the temperature of the high-pressure reactor was raised to 150°C. The reaction was kept warm for 12 hours. After the reaction was completed, the reactor was cooled to room temperature and centrifuged at 8000rpm for 10 minutes using a centrifuge. The supernatant was discarded and the precipitate was washed 4 times with deionized water and anhydrous ethanol. Finally, the washed precipitate was placed in a vacuum drying oven and dried at 80°C for 12 hours to obtain an antistatic filler.

[0066] Example 4

[0067] This embodiment provides a method for preparing modified CPVC for use in preparing highly wear-resistant and antistatic plastics based on CPVC modification, comprising the following steps:

[0068] Step (i) Preparation of CPVC

[0069] Weigh: 20.0 g of PVC powder, 100.0 mL of deionized water, 2.0 g of talc, and 3.0 g of benzoyl peroxide were added to a reactor. After nitrogen was introduced to expel the air, the gas in the reactor was extracted using a vacuum pump until the pressure dropped to a negative pressure of 0.1 MPa. Chlorine was introduced into the reactor, the internal pressure was controlled to 0.3 MPa, and the reactor was sealed. The reactor temperature was continued to be raised to 85°C and kept warm for 5 hours. After the reaction was completed, the reactor temperature was lowered to room temperature. After the reaction system was adjusted to neutral with saturated sodium hydroxide, the filter cake was collected by filtration, washed three times with anhydrous ethanol and deionized water, and then transferred to a vacuum drying oven at 60°C and vacuum dried to constant weight to obtain CPVC.

[0070] Step (ii) Preparation of hybrid CPVC

[0071] 16.0 g of CPVC and 200.0 mL of N,N-dimethylacetamide were weighed and added to a reactor. The reactor temperature was raised to 80° C. and stirred at this temperature for 1 hour. Then, 2.0 g of the antistatic filler prepared in Example 1 was added to the reactor. The mixture was stirred at this temperature for 3 hours. After the reaction was completed, the reactor temperature was lowered to room temperature. The reaction system was adjusted to neutrality using saturated sodium hydroxide. The reaction solution was transferred to a rotary evaporator at 100° C. and evaporated under reduced pressure until no liquid was recovered to obtain hybrid CPVC.

[0072] Step (iii) Preparation of modified CPVC

[0073] Weigh: 10.0 g of ethyl bromide and 100.0 mL of N,N-dimethylformamide and mix to obtain a modified solution;

[0074] Weigh: 10.0g hybrid CPVC and 60.0mL N,N-dimethylformamide were added to the reactor. After nitrogen protection, the temperature of the reactor was raised to 100°C. After stirring for 20 minutes, 0.5g triethylamine was added to the reactor. After stirring for 5 minutes, 20mL of the modified liquid was added dropwise to the reactor. After the addition was continued for 1 hour, the reaction mixture was stirred for 3 hours. After the reaction was completed, the temperature of the reactor was lowered to room temperature, and the reaction liquid was transferred to a rotary evaporator at a temperature of 100°C and evaporated under reduced pressure until no liquid was recovered to obtain modified CPVC.

[0075] Example 5

[0076] This embodiment provides a method for preparing modified CPVC for use in preparing highly wear-resistant and antistatic plastics based on CPVC modification, comprising the following steps:

[0077] Step (i) Preparation of CPVC

[0078] Weigh: 30.0 g of PVC powder, 120.0 mL of deionized water, 2.0 g of talc, and 5.0 g of benzoyl peroxide were added to a reactor. After nitrogen was introduced to expel the air, the gas in the reactor was extracted using a vacuum pump until the pressure dropped to a negative pressure of 0.1 MPa. Chlorine was introduced into the reactor, the internal pressure was controlled to 0.3 MPa, and the reactor was sealed. The reactor temperature was continued to be raised to 95°C and kept warm for 7 hours. After the reaction was completed, the reactor temperature was lowered to room temperature. After the reaction system was adjusted to neutral with saturated sodium hydroxide, the filter cake was collected by filtration, washed 5 times with anhydrous ethanol and deionized water, and then transferred to a vacuum drying oven at 60°C and vacuum dried to constant weight to obtain CPVC.

[0079] Step (ii) Preparation of hybrid CPVC

[0080] 20.0 g of CPVC and 200.0 mL of N,N-dimethylacetamide were weighed and added to a reactor. The reactor temperature was raised to 90° C. and stirred at this temperature for 2 h. Then, 4.0 g of the antistatic filler prepared in Example 2 was added to the reactor. The mixture was stirred at this temperature for 4 h. After the reaction was completed, the reactor temperature was lowered to room temperature. The reaction system was adjusted to neutral using saturated sodium hydroxide. The reaction solution was transferred to a rotary evaporator at 110° C. and evaporated under reduced pressure until no liquid was recovered to obtain hybrid CPVC.

[0081] Step (iii) Preparation of modified CPVC

[0082] Weigh 20.0 g of ethyl bromide and 120.0 mL of N,N-dimethylformamide and mix to obtain a modified solution;

[0083] 14.0 g of hybrid CPVC and 72.0 mL of N,N-dimethylformamide were weighed and added to a reactor. After nitrogen protection, the temperature of the reactor was raised to 110°C. After stirring at this temperature for 20 minutes, 1.6 g of triethylamine was added to the reactor. After stirring at this temperature for 8 minutes, 24.0 mL of the modified liquid was added dropwise to the reactor. After the addition was continued for 2 hours, the mixture was stirred at this temperature for 4 hours. After the reaction was completed, the temperature of the reactor was lowered to room temperature, and the reaction liquid was transferred to a rotary evaporator at a temperature of 110°C and evaporated under reduced pressure until no liquid was recovered to obtain modified CPVC.

[0084] Example 6

[0085] This embodiment provides a method for preparing modified CPVC for use in preparing highly wear-resistant and antistatic plastics based on CPVC modification, comprising the following steps:

[0086] Step (i) Preparation of CPVC

[0087] Weigh: 25.0 g PVC powder, 120.0 mL deionized water, 2.0 g talc and 4.0 g benzoyl peroxide were added to the reactor. After nitrogen was introduced to expel the air, the gas in the reactor was extracted using a vacuum pump until the pressure dropped to a negative pressure of 0.1 MPa. Chlorine was introduced into the reactor, the internal pressure was controlled to 0.3 MPa and the reactor was sealed. The reactor temperature was continued to be raised to 90°C and kept warm for 6 hours. After the reaction was completed, the reactor temperature was lowered to room temperature. After the reaction system was adjusted to neutral with saturated sodium hydroxide, the filter cake was collected by filtration and washed four times with anhydrous ethanol and deionized water. The filter cake was transferred to a vacuum drying oven at 60°C and vacuum dried to constant weight to obtain CPVC.

[0088] Step (ii) Preparation of hybrid CPVC

[0089] 18.0 g of CPVC and 200.0 mL of N,N-dimethylacetamide were weighed and added to a reactor. The reactor temperature was raised to 90° C. and stirred at this temperature for 2 h. Then, 3.0 g of the antistatic filler prepared in Example 3 was added to the reactor. The mixture was stirred at this temperature for 3 h. After the reaction was completed, the reactor temperature was lowered to room temperature. The reaction system was adjusted to neutrality using saturated sodium hydroxide. The reaction solution was transferred to a rotary evaporator at 110° C. and evaporated under reduced pressure until no liquid was recovered to obtain hybrid CPVC.

[0090] Step (iii) Preparation of modified CPVC

[0091] Weigh: 16.0 g of ethyl bromide and 100.0 mL of N,N-dimethylformamide and mix to obtain a modified solution;

[0092] Weigh: 12.0g hybrid CPVC and 64.0mL N,N-dimethylformamide were added to the reactor. After nitrogen protection, the temperature of the reactor was raised to 110°C. After stirring at this temperature for 24 minutes, 1.2g triethylamine was added to the reactor. After stirring at this temperature for 6 minutes, 21.0mL of the modified liquid was added dropwise to the reactor. After the addition was continued for 2 hours, the mixture was stirred at this temperature for 4 hours. After the reaction was completed, the temperature of the reactor was lowered to room temperature, and the reaction liquid was transferred to a rotary evaporator at a temperature of 110°C and evaporated under reduced pressure until no liquid was recovered to obtain modified CPVC.

[0093] Example 7

[0094] This embodiment provides a method for preparing a highly wear-resistant and antistatic plastic based on CPVC modification, comprising the following steps:

[0095] Step 1: Preparation of modified polyamic acid

[0096] Weigh: 40.0g 6-methyl-1,3,5-triazine-2,4-diamine and 300.0mL N,N-dimethylformamide are added to a reactor at a temperature of 5°C, and the reactants are stirred and kept warm until they are completely dissolved. Then, 1.1 times the molar amount of 6-methyl-1,3,5-triazine-2,4-diamine 4,4'-oxydiphthalic anhydride is added to the reactor. After the addition is completed, the reactor is stably raised to 30°C, and the reaction is kept warm for 2h. Then, 3.0g (3-aminopropyl) diethyl phosphate is added to the reactor and kept warm for 20min. After the reaction is completed, the reactor temperature is lowered to room temperature, and the reaction liquid is transferred to a rotary evaporator at a temperature of 100°C and evaporated under reduced pressure until no liquid is recovered to obtain a modified polyamic acid.

[0097] Step 2: Preparation of modified thermal stabilizer

[0098] Weigh 10.0 g of calcium chloride, 10.0 g of zinc nitrate, and 100.0 mL of deionized water and mix to obtain a composite modification solution.

[0099] Weigh: 40.0g modified polyamic acid and 200.0mL N,N-dimethylformamide are added to the reactor and stirred. After the temperature of the reactor is raised to 70°C, the pH of the reaction system is adjusted to 8 with a saturated sodium hydroxide aqueous solution, and 100.0mL of the composite modification liquid is added to the reactor. The reaction is kept warm for 2h. After the reaction is completed, the temperature of the reactor is lowered to room temperature, and the reaction liquid is transferred to a rotary evaporator at a temperature of 100°C. It is evaporated under reduced pressure until no liquid is extracted to obtain a modified thermal stabilizer.

[0100] Step 3: Preparation of CPVC-based plastics

[0101] In parts by weight, 80 parts of the modified CPVC prepared in Example 4, 6 parts of the modified heat stabilizer, 5 parts of dioctyl phthalate, 1 part of tris (2,4-di-tert-butylphenyl) phosphate, 1 part of 2-hydroxy-4-octyloxybenzophenone and 1 part of calcium stearate were weighed and added to a twin-screw extruder. The temperatures of the seven temperature sections of the twin-screw extruder from the feed port to the discharge port were 180° C., 185° C., 185° C., 190° C., 190° C., 200° C., and 200° C., respectively. The main engine speed of the twin-screw extruder was 120 rpm, the pressure was 80 bar, and melt extrusion was performed. After natural curing, a CPVC-based plastic was obtained.

[0102] Example 8

[0103] This embodiment provides a method for preparing a highly wear-resistant and antistatic plastic based on CPVC modification, comprising the following steps:

[0104] Step 1: Preparation of modified polyamic acid

[0105] Weigh: 50.0g6-methyl-1,3,5-triazine-2,4-diamine and 360.0mLN,N-dimethylformamide are added to a reactor at a temperature of 0°C, and the reactants are stirred until they are completely dissolved. Then, 1.2 times the molar amount of 6-methyl-1,3,5-triazine-2,4-diamine 4,4'-oxydiphthalic anhydride is added to the reactor. After the addition is completed, the reactor is stably raised to 50°C. After the reaction is kept warm for 4 hours, 4.0g (3-aminopropyl) diethyl phosphate is added to the reactor and kept warm for 25 minutes. After the reaction is completed, the reactor temperature is lowered to room temperature, and the reaction solution is transferred to a rotary evaporator at a temperature of 110°C and evaporated under reduced pressure until no liquid is recovered to obtain a modified polyamic acid.

[0106] Step 2: Preparation of modified thermal stabilizer

[0107] Weigh 20.0 g of calcium chloride, 20.0 g of zinc nitrate, and 120.0 mL of deionized water and mix to obtain a composite modification solution.

[0108] Weigh: 50.0g modified polyamic acid and 240.0mL N,N-dimethylformamide are added to the reactor and stirred. After the temperature of the reactor is raised to 90°C, the pH of the reaction system is adjusted to 10 with a saturated sodium hydroxide aqueous solution, and 120.0mL of the composite modification liquid is added to the reactor. The reaction is kept warm for 3 hours. After the reaction is completed, the temperature of the reactor is lowered to room temperature, and the reaction liquid is transferred to a rotary evaporator at a temperature of 110°C. It is evaporated under reduced pressure until no liquid is recovered to obtain a modified thermal stabilizer.

[0109] Step 3: Preparation of CPVC-based plastics

[0110] In parts by weight, 100 parts of the modified CPVC prepared in Example 5, 8 parts of the modified heat stabilizer, 10 parts of dioctyl phthalate, 2 parts of tris (2,4-di-tert-butylphenyl) phosphate, 2 parts of 2-hydroxy-4-octyloxybenzophenone and 2 parts of calcium stearate were weighed and added to a twin-screw extruder. The temperatures of the seven temperature zones of the twin-screw extruder from the feed port toward the discharge port were 180° C., 185, 185° C., 190° C., 190° C., 200° C., and 200° C., respectively. The main engine speed of the twin-screw extruder was 160 rpm, the pressure was 120 bar, and melt extrusion was performed. After natural curing, a CPVC-based plastic was obtained.

[0111] Example 9

[0112] This embodiment provides a method for preparing a highly wear-resistant and antistatic plastic based on CPVC modification, comprising the following steps:

[0113] Step 1: Preparation of modified polyamic acid

[0114] Weigh: 45.0g 6-methyl-1,3,5-triazine-2,4-diamine and 320.0mL N,N-dimethylformamide are added to a reactor at a temperature of 3°C, and the reactants are stirred until they are completely dissolved. Then, 1.2 times the molar amount of 6-methyl-1,3,5-triazine-2,4-diamine 4,4'-oxydiphthalic anhydride is added to the reactor. After the addition is completed, the reactor is stably raised to 40°C. After the reaction is kept warm for 3 hours, 4.0g (3-aminopropyl) diethyl phosphate is added to the reactor and kept warm for 25 minutes. After the reaction is completed, the reactor temperature is lowered to room temperature, and the reaction solution is transferred to a rotary evaporator at a temperature of 110°C and evaporated under reduced pressure until no liquid is recovered to obtain a modified polyamic acid.

[0115] Step 2: Preparation of modified thermal stabilizer

[0116] Weigh 16.0 g of calcium chloride, 16.0 g of zinc nitrate, and 120.0 mL of deionized water and mix to obtain a composite modification solution.

[0117] Weigh: 45.0g modified polyamic acid and 210.0mL N,N-dimethylformamide are added to the reactor and stirred. After the temperature of the reactor is raised to 80°C, the pH of the reaction system is adjusted to 9 with a saturated sodium hydroxide aqueous solution, and 120.0mL of the composite modification liquid is added to the reactor. The reaction is kept warm for 3 hours. After the reaction is completed, the temperature of the reactor is lowered to room temperature, and the reaction liquid is transferred to a rotary evaporator at a temperature of 110°C. It is evaporated under reduced pressure until no liquid is extracted to obtain a modified thermal stabilizer.

[0118] Step 3: Preparation of CPVC-based plastics

[0119] In parts by weight, 96 parts of the modified CPVC prepared in Example 6, 7 parts of a modified heat stabilizer, 8 parts of dioctyl phthalate, 2 parts of tris(2,4-di-tert-butylphenyl) phosphate, 2 parts of 2-hydroxy-4-octyloxybenzophenone and 2 parts of calcium stearate were weighed and added to a twin-screw extruder. The temperatures of the seven temperature zones of the twin-screw extruder from the feed port toward the discharge port were 180°C, 185°C, 185°C, 190°C, 190°C, 200°C and 200°C, respectively. The main engine speed of the twin-screw extruder was 150 rpm and the pressure was 100 bar. Melt extrusion and natural curing were performed to obtain a CPVC-based plastic.

[0120] Comparative Example 1

[0121] The difference between this comparative example and Example 9 is that the modified CPVC used in step 3 is prepared by omitting step (i) and an equal amount of PVC powder is used to replace the CPVC in step (ii).

[0122] Comparative Example 2

[0123] The difference between this comparative example and Example 9 is that in step (ii) of the preparation process of the modified CPVC used in step 3, the antistatic filler is eliminated and an equal amount of tris(2-aminoethyl)amine is used instead.

[0124] Comparative Example 3

[0125] The difference between this comparative example and Example 9 is that the modified thermal stabilizer is omitted in step 3.

[0126] Data Analysis:

[0127] The volume abrasion loss of the CPVC-based plastics prepared in Examples 7-9 and Comparative Examples 1-3 was tested in accordance with the standard GB / T 9867-2008 "Determination of wear resistance of vulcanized or thermoplastic rubber (rotating roller abrader method)".

[0128] The antistatic properties of the CPVC-based plastics prepared in Examples 7-9 and Comparative Examples 1-3 were tested with reference to the standard GB / T 15662-1995 "Test method for volume resistivity of conductive and antistatic plastics";

[0129] The emission of acidic gases during the production of the CPVC-based plastics prepared in Examples 7-9 and Comparative Examples 1-3 was measured with reference to the standard HJ 549-2016 “Determination of Hydrogen Chloride in Ambient Air and Waste Gases - Ion Chromatography”;

[0130] The vertical burning grades of the CPVC-based plastic insulating cable materials prepared in Examples 7-9 and Comparative Examples 1-3 were determined with reference to the standard GB / T 2408-2021 “Determination of combustion performance of plastics—Horizontal and vertical methods”; specific data are shown in Table 1.

[0131] Table 1 - Performance test data of each sample

[0132]

[0133]

[0134] Performance testing:

[0135] After comparing and analyzing the data in Table 1, it can be found that the volume wear of the CPVC-based plastic prepared by the present invention is 3.5 mm, and the volume resistivity is 3.5×10 4 The vertical combustion grade of Ω·m is V-0, and all the data are better than the comparative example;

[0136] After comparing and analyzing the data in Table 1, it can be found that the wear resistance, antistatic properties and flame retardancy of the CPVC-based plastic prepared in Comparative Example 1 are significantly reduced. This indicates that the use of PVC powder to replace CPVC lacks chlorination modification, reduces the thermal stability of the polymer chain, and makes it more susceptible to softening and wear after heating, resulting in the material losing its strength under friction conditions and significantly reducing its wear resistance. Although the antistatic filler is retained, the matrix is composed of unchlorinated PVC, resulting in poor interfacial bonding, the inability to stably construct a conductive network, and the electron migration path is blocked. The overall antistatic performance is unstable and easily affected by the environment. At the same time, CPVC has a high chlorine content, which effectively inhibits combustion. However, after using PVC as a substitute, the chlorine content is reduced, and combustible gases are easily generated during combustion. There is a lack of a synergistic flame retardant system, and the flame retardancy of the material is significantly degraded.

[0137] After comparing and analyzing the data in Table 1, it can be found that the wear resistance, antistatic performance, flame retardancy and environmental performance of the CPVC-based plastic prepared in Comparative Example 2 are significantly reduced, indicating that the lack of the reinforcing effect of graphene-based fillers will lead to weakened support of the polymer matrix structure, decreased mechanical properties of the material, and more prone to microcracks under wear stress, resulting in poor wear resistance. In addition, the lack of antistatic fillers will lose the key to constructing a conductive network. Only by replacing it with tris(2-aminoethyl)amine, the surface charge cannot be evenly distributed, and the antistatic ability is significantly reduced. At the same time, graphene forms a carbon layer during the combustion process to shield heat sources and oxygen, which helps to flame retardant. After this component is removed, the system lacks this flame retardant synergistic mechanism, resulting in enhanced thermal cracking and increased flame spread speed. Graphene-based fillers can form a stable carbon layer under high temperature conditions. This carbon layer effectively blocks the contact between the heat source and oxygen, thereby slowing down the pyrolysis process of the material and reducing the release of harmful gases.

[0138] A comparative analysis of the data in Table 1 shows that the wear resistance, flame retardancy, and environmental friendliness of the CPVC-based plastic prepared in Comparative Example 3 are significantly reduced. This indicates that the lack of a modified thermal stabilizer makes the material more susceptible to thermal degradation during extrusion heat processing, resulting in polymer chain breakage, decreased physical properties, rough surface of the molded product, and significant deterioration in wear resistance. The modified thermal stabilizer contains phosphorus-based and metal complex components, which play an important role in combustion inhibition. Its absence directly reduces the ability to control thermal cracking products, accelerates the flame spread, and reduces flame retardancy. At the same time, the lack of an effective thermal stabilization synergistic system increases the release of thermal degradation byproducts such as hydrogen chloride gas and other irritating gases, which have adverse effects on the environment and equipment, and the environmental friendliness of the processing process is significantly insufficient.

[0139] Finally, it is explained that this solution achieves dual optimization in structure and performance through the synergistic compounding of multiple functional materials. The introduction of ammoniated graphene forms a good interface bonding with the CPVC matrix, which not only improves the stability of the conductive network, but also strengthens the mechanical support structure; the modified thermal stabilizer effectively complexes with the CPVC chain segments, enhancing the thermal stability and aging resistance of the material, while inhibiting degradation reactions during processing; the flame retardant component and the filler jointly construct a dual mechanism of heat shielding and gas phase flame retardancy, significantly improving the overall flame retardancy level. On this basis, the components are not only physically closely embedded, but also establish a stable composite network through chemical bonding, so that the CPVC-based plastic prepared by the present invention exhibits excellent synergistic properties.

[0140] The above content is merely an example and explanation of the structure of the present invention. Those skilled in the art 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 shall fall within the scope of protection of the present invention.

[0141] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0142] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. High wear-resistant and antistatic plastic based on CPVC modification, characterized by: The invention comprises the following raw materials in parts by weight: 80-100 parts of modified CPVC, 6-8 parts of modified heat stabilizer and 8-16 parts of auxiliary materials; The auxiliary materials include the following raw materials in parts by weight: 5-10 parts of plasticizer, 1-2 parts of antioxidant, 1-2 parts of light stabilizer and 1-2 parts of lubricant; The modified CPVC preparation method comprises: adding hybrid CPVC and N,N-dimethylformamide into a reactor, introducing nitrogen protection, raising the temperature of the reactor to 100-110° C., and stirring at this temperature for 20-25 minutes. Then, triethylamine is added to the reactor, and stirring at this temperature is continued for 5-8 minutes. Then, a modification liquid is added dropwise to the reactor, and the addition is continued for 1-2 hours. The mixture is stirred at this temperature for 3-4 hours, and post-processed to obtain the modified CPVC.

2. The highly wear-resistant and antistatic plastic based on CPVC modification according to claim 1, characterized in that: In the process of preparing the modified CPVC, the amount ratio of hybrid CPVC, N,N-dimethylformamide, triethylamine and modifying liquid is 5-7g:30-36mL:0.5-0.8g:10-12mL, wherein the modifying liquid is obtained by mixing ethyl bromide and N,N-dimethylformamide in an amount ratio of 1-2g:10-12mL.

3. The highly wear-resistant and antistatic plastic based on CPVC modification according to claim 1, characterized in that: The preparation method of the hybrid CPVC comprises the following steps: A1. Add PVC powder, deionized water, talc, and benzoyl peroxide to a reactor. After nitrogen is introduced to expel the air, the gas in the reactor is extracted using a vacuum pump until the pressure drops to a negative pressure of 0.1 MPa. Then, chlorine is introduced into the reactor to control the internal pressure to 0.3 MPa. The reactor is sealed and the temperature of the reactor is continuously raised to 85-95°C. The reaction is maintained at this temperature for 5-7 hours, and CPVC is obtained by post-processing. A2. Add CPVC and N,N-dimethylacetamide into a reactor, raise the temperature of the reactor to 80-90°C, keep stirring for 1-2 hours, add antistatic filler into the reactor, continue keeping stirring for 3-4 hours, and perform post-treatment to obtain hybrid CPVC.

4. The highly wear-resistant and antistatic plastic based on CPVC modification according to claim 3, characterized in that: In step A1, the usage ratio of the PVC powder, deionized water, talc and benzoyl peroxide is 2-3 g:10-12 mL:0.2 g:0.3-0.5 g; in step A2, the usage ratio of the CPVC, N,N-dimethylacetamide and antistatic filler is 8-10 g:100 mL:1-2 g.

5. The highly wear-resistant and antistatic plastic based on CPVC modification according to claim 3, characterized in that: The preparation method of the antistatic filler comprises the following steps: B1. Add graphene oxide, deionized water, and anhydrous ethanol to a reactor and stir. After the temperature of the reactor is raised to 60-80° C., add tris(2-aminoethyl)amine to the reactor and keep the temperature to react for 40-60 minutes. Post-process to obtain ammoniated graphene. B2. Add the ammoniated graphene and deionized water into a high-pressure reactor, add zinc nitrate into the high-pressure reactor under stirring, and after the addition is completed, use a saturated sodium hydroxide aqueous solution to adjust the pH of the reaction system to 8-10. After stirring for 20-30 minutes, seal the high-pressure reactor and increase the temperature of the high-pressure reactor to 140-160° C., keep the reaction warm for 10-12 hours, and post-treat to obtain an antistatic filler.

6. The highly wear-resistant and antistatic plastic based on CPVC modification according to claim 5, characterized in that: In step B1, the ratio of graphene oxide, deionized water, anhydrous ethanol and tris(2-aminoethyl)amine is 4-5 g:10-12 mL:10-12 mL:1-2 g; in step B2, the ratio of ammoniated graphene, deionized water and zinc nitrate is 4-5 g:24-30 mL:1 g.

7. The highly wear-resistant and antistatic plastic based on CPVC modification according to claim 1, characterized in that: The preparation method of the modified thermal stabilizer comprises the following steps: C1. Add 6-methyl-1,3,5-triazine-2,4-diamine and N,N-dimethylformamide to a reactor at a temperature of 0-5°C, keep warm and stir until the reactants are completely dissolved, add a calculated amount of 4,4'-oxydiphthalic anhydride to the reactor, and after the addition is complete, steadily raise the temperature of the reactor to 30-50°C, keep warm and react for 2-4 hours, add a capping agent to the reactor, keep warm for 20-30 minutes, and post-treat to obtain a modified polyamic acid; C2. Add modified polyamic acid and N,N-dimethylformamide into the reactor and stir. After the temperature of the reactor is raised to 70-90°C, use saturated sodium hydroxide aqueous solution to adjust the pH of the reaction system to 8-10, add the composite modification liquid into the reactor, keep the temperature for reaction for 2-3 hours, and post-treat to obtain the modified thermal stabilizer.

8. The highly wear-resistant and antistatic plastic based on CPVC modification according to claim 7, characterized in that: In step C1, the amount ratio of 6-methyl-1,3,5-triazine-2,4-diamine, N,N-dimethylformamide and the end-capping agent is 4-5g:30-36mL:0.3-0.5g, wherein the amount of 4,4'-oxydiphthalic anhydride is 1.1-1.2 times the molar amount of 6-methyl-1,3,5-triazine-2,4-diamine, and the end-capping agent is (3-aminopropyl) diethyl phosphate; in step C2, the amount ratio of modified polyamic acid, N,N-dimethylformamide and composite modification liquid is 4-5g:20-24mL:10-12mL, wherein the composite modification liquid is a mixture of calcium chloride, zinc nitrate and deionized water in an amount ratio of 1-2g:1-2g:10-12mL.

9. The method for preparing a highly wear-resistant and antistatic plastic based on CPVC modification according to any one of claims 1 to 8, characterized in that: The preparation method of the highly wear-resistant and antistatic plastic based on CPVC modification comprises the following steps: adding modified CPVC, a modified heat stabilizer, a plasticizer, an antioxidant, a light stabilizer and a lubricant into a twin-screw extruder, melt-extruding, and naturally curing to obtain a CPVC-based plastic.

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