High wear resistant antistatic plastic based on cpvc modification and its preparation method

Abstract

This invention discloses a high-wear-resistant and antistatic plastic based on CPVC modification and its preparation method, belonging to the field of composite CPVC preparation technology. It addresses the technical problem that the wear resistance and antistatic properties of existing CPVC-based plastics need further improvement. The high-wear-resistant and antistatic plastic based on CPVC modification comprises the following raw material components by weight: 80-100 parts modified CPVC, 6-8 parts modified heat stabilizer, and 8-16 parts auxiliary materials. In this invention, the amino groups on the surface of the prepared antistatic filler participate 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. Furthermore, quaternization introduces ionic structures into the hybrid CPVC, resulting in modified CPVC. This modified CPVC is then mixed with the prepared polyamic acid-based modified heat stabilizer and auxiliary materials and melt-extruded to obtain the CPVC-based plastic.

Description

Technical Field

[0001] This invention relates to the field of composite CPVC preparation technology, specifically to high wear-resistant and antistatic plastics based on CPVC modification and their preparation methods. Background Technology

[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 are also deepening. Early CPVC plastics mainly relied on their high thermal stability and mechanical strength to play a basic role in fields such as construction and chemical pipelines. However, in the face of complex high-friction conditions, their wear resistance has gradually become a bottleneck restricting their application expansion. To address this, researchers have significantly improved their surface hardness and wear life by introducing rigid fillers, nano-reinforcements, and lubricating modifiers, enabling them to exhibit superior 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 capabilities 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] Currently, although CPVC-based materials have certain advantages in terms of heat resistance and chemical stability, their performance bottlenecks are gradually becoming apparent when facing more demanding or multifunctional application scenarios. Taking wear resistance as an example, under dynamic load conditions such as continuous friction and high-speed impact, the surface structure of existing materials is difficult to maintain its integrity, and the wear rate control fluctuates to some extent. During long-term use, the surface is prone to micro-failure phenomena such as scratches and fatigue damage. In terms of antistatic properties, conventional modification methods mainly rely on conductive filler doping, but problems such as uneven distribution of conductive phase and unstable conductive path are still prominent. Especially in complex environments such as humid heat and dust, the antistatic effect is easy to decay, making it difficult to achieve long-lasting and consistent antistatic protection.

[0004] At the same time, with the deepening of the concepts of green manufacturing and sustainable development, the environmental adaptability of materials has received increasing attention. CPVC has relatively poor thermal stability during processing and service. When heated, it is prone to decomposition and releases corrosive or harmful gases such as hydrogen chloride, which not only affects its subsequent processing performance, but may also pose hidden dangers to the production environment and safety of use. 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 exacerbates the regulatory pressure on environmental protection and safety to a certain extent.

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

[0006] The purpose of this invention is to provide a high wear-resistant and antistatic plastic based on CPVC modification and its preparation method, in order to solve the technical problem that the wear resistance and antistatic properties of CPVC-based plastics in the prior art need to be further improved.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] The high wear-resistant and antistatic plastic based on CPVC modification comprises the following raw material composition by weight: 80-100 parts modified CPVC, 6-8 parts modified heat stabilizer and 8-16 parts auxiliary materials;

[0009] The excipients consist of the following raw materials in parts by weight: 5-10 parts plasticizer, 1-2 parts antioxidant, 1-2 parts light stabilizer and 1-2 parts 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-octoxybenzophenone 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 is prepared as follows: hybrid CPVC and N,N-dimethylformamide are added to a reaction vessel. After nitrogen protection, the temperature of the reaction vessel is raised to 100-110℃ and stirred for 20-25 minutes. Then, triethylamine is added to the reaction vessel and stirred for another 5-8 minutes. Finally, the modified liquid is added dropwise to the reaction vessel and stirred for 1-2 hours. After stirring for 3-4 hours, the modified CPVC is obtained after post-treatment.

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

[0013] Furthermore, in the preparation of modified CPVC, the ratio of hybrid CPVC, N,N-dimethylformamide, triethylamine, and modifying solution is 5-7g:30-36mL:0.5-0.8g:10-12mL. The modifying solution is obtained by mixing bromoethane and N,N-dimethylformamide at a ratio of 1-2g:10-12mL. The post-treatment includes: after the reaction is completed, the temperature of the reaction vessel is lowered to room temperature, and the reaction solution is transferred to a rotary evaporator at a temperature of 100-110℃ and evaporated under reduced pressure until no liquid is collected, thus obtaining modified CPVC.

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

[0015] A1. Add PVC powder, deionized water, talc powder and benzoyl peroxide to the reactor. After purging the air by introducing nitrogen, use a vacuum pump to extract the gas in the reactor until the pressure drops to a negative pressure of 0.1 MPa. Then, introduce chlorine gas into the reactor, control the internal pressure to 0.3 MPa and seal the reactor. Continue to raise the temperature of the reactor to 85-95℃ and keep it at that temperature for 5-7 hours. After post-processing, CPVC is obtained.

[0016] A2. Add CPVC and N,N-dimethylacetamide to a reactor, raise the reactor temperature to 80-90℃, keep it warm and stir for 1-2 hours, add antistatic packing to the reactor, and continue to keep it warm and stir for 3-4 hours. The post-treatment yields hybrid CPVC.

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

[0018]

[0019] In the formula: This indicates an 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 gas under high pressure, thereby introducing a large number of chlorine groups into the polyvinyl chloride chain segment, thus preparing CPVC. The amino group on the antistatic filler acts as a strong nucleophile, attacking the carbon atoms of the CPVC main chain and replacing the chlorine groups, thus preparing hybrid CPVC.

[0021] Further, in step A1, the ratio of PVC powder, deionized water, talc, and benzoyl peroxide is 2-3g:10-12mL:0.2g:0.3-0.5g. The post-treatment includes: after the reaction is completed, wait for the temperature of the reaction vessel to drop to room temperature, adjust the reaction system to neutral using saturated sodium hydroxide, collect the filter cake by vacuum filtration, wash it 3-5 times with anhydrous ethanol and deionized water, and then transfer the filter cake to a vacuum drying oven at 60°C and vacuum dry it to constant weight to obtain CPVC.

[0022] Further, in step A2, the ratio of CPVC, N,N-dimethylacetamide, and antistatic filler is 8-10g:100mL:1-2g. The post-treatment includes: after the reaction is completed, wait for the temperature of the reaction vessel to drop to room temperature, adjust the reaction system to neutral using saturated sodium hydroxide, transfer the reaction solution to a rotary evaporator at a temperature of 100-110℃, and evaporate under reduced pressure until no liquid is collected to obtain hybrid CPVC.

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

[0024] B1. Add graphene oxide, deionized water and anhydrous ethanol to a reaction vessel and stir. After the temperature of the reaction vessel is raised to 60-80℃, add tris(2-aminoethyl)amine to the reaction vessel and keep the reaction at the temperature for 40-60 min. After post-treatment, ammoniated graphene is obtained.

[0025] The reaction principle for preparing ammoniated graphene is as follows: under heating conditions, the primary amino group of tris(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 ammoniated graphene and deionized water to a high-pressure reactor. Add zinc nitrate to the reactor while stirring. After the addition is complete, adjust the pH of the reaction system to 8-10 using a saturated sodium hydroxide aqueous solution. Stir for 20-30 minutes, then seal the high-pressure reactor and raise the temperature of the reactor to 140-160℃. Maintain the temperature for 10-12 hours. Post-processing yields the 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. Zinc ions coordinate with amino, hydroxyl, or carboxyl groups on the surface of ammoniated graphene, guiding zinc oxide to deposit on the graphene surface, thereby preparing an antistatic filler.

[0028] Further, 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. The post-treatment includes: after the reaction is completed, the reaction vessel is cooled to room temperature, centrifuged at 8000 rpm for 10 min, the supernatant is discarded, and the precipitate is washed 3-5 times with deionized water and anhydrous ethanol. Finally, the washed precipitate is placed in a vacuum drying oven and dried at 80℃ for 12 h 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. The post-treatment includes: after the reaction is completed, the reaction vessel is cooled to room temperature, centrifuged at 8000rpm for 10min, the supernatant is discarded, and the precipitate is washed 3-5 times with deionized water and anhydrous ethanol. Finally, the washed precipitate is placed in a vacuum drying oven and dried at 80℃ for 12h to obtain the antistatic filler.

[0030] Furthermore, the preparation method of the modified heat stabilizer includes the following steps:

[0031] C1. 6-Methyl-1,3,5-triazine-2,4-diamine and N,N-dimethylformamide are added to a reaction vessel at a temperature of 0-5℃. After stirring at this temperature until all the reactants are dissolved, a calculated amount of 4,4'-oxophthalic anhydride is added to the reaction vessel. After the addition is complete, the temperature of the reaction vessel is raised to 30-50℃ and the reaction is maintained for 2-4 hours. Then, a capping agent is added to the reaction vessel and the reaction is maintained for 20-30 minutes. The modified polyamic acid is obtained after post-treatment.

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

[0033]

[0034] In the formula:

[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, attacking the carbonyl carbon of 4,4'-oxophthalic anhydride, resulting in a nucleophilic addition ring-opening reaction. The anhydride ring is broken to form an amide bond and a carboxyl group, and the polyamic acid backbone is generated through stepwise polymerization. Subsequently, the amino group of (3-aminopropyl)phosphodiesterate reacts with the terminal anhydride or carboxyl group to end the polyamic acid chain and introduce a phosphorus side chain, thereby preparing the modified polyamic acid.

[0036] C2. Modified polyamic acid and N,N-dimethylformamide are added to a reaction vessel and stirred. After the temperature of the reaction vessel is raised to 70-90℃, the pH of the reaction system is adjusted to 8-10 using a saturated sodium hydroxide aqueous solution. Then, a composite modification solution is added to the reaction vessel, and the reaction is kept at the temperature for 2-3 hours. The modified heat stabilizer is obtained after post-treatment.

[0037] The reaction principle for preparing the modified heat stabilizer is as follows: the carboxyl group of the modified polyamic acid dissociates into a carboxylate group under alkaline conditions. The carboxyl group then forms a metal-carboxylate complex structure 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 through coordination bonds. The calcium ions and zinc ions coordinate with the oxygen atoms of the carboxyl group to form a stable complex structure, thus obtaining the modified heat stabilizer.

[0038] Further, in step C1, the ratio of 6-methyl-1,3,5-triazine-2,4-diamine, N,N-dimethylformamide, and end-capping agent is 4-5g:30-36mL:0.3-0.5g, wherein the amount of 4,4'-oxophthalic 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) phosphate diethyl ester. The post-treatment includes: after the reaction is completed, after the temperature of the reaction vessel is reduced to room temperature, the reaction solution is transferred to a rotary evaporator at a temperature of 100-110℃ and evaporated under reduced pressure until no liquid is collected, to obtain modified polyamic acid;

[0039] Further, in step C2, the ratio of modified polyamic acid, N,N-dimethylformamide, and composite modification solution is 4-5g:20-24mL:10-12mL. The composite modification solution 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, wait for the temperature of the reaction vessel to drop to room temperature, transfer the reaction solution to a rotary evaporator at a temperature of 100-110℃, and evaporate under reduced pressure until no liquid is collected to obtain the modified heat stabilizer.

[0040] The present invention also discloses a method for preparing high wear-resistant and antistatic plastic based on CPVC modification. The method is as follows: modified CPVC, modified heat stabilizer, plasticizer, antioxidant, light stabilizer and lubricant are added to a twin-screw extruder, melt extruded and naturally cured to obtain CPVC-based plastic.

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

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

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

[0044] 2. The CPVC prepared by this invention improves the matrix properties through a chlorination process. Combined with the unique structure of the antistatic filler, the antistatic filler is firmly embedded in the polymer chain segments, forming a high-density polar group network. Furthermore, the antistatic filler is loaded with zinc oxide particles on the surface of graphene oxide through a hydrothermal reduction process, which improves the electron conduction efficiency. It can quickly release the charge in the early stage of charge accumulation and build an efficient conductive network, significantly enhancing the conductivity of the material. The amino groups on the filler surface participate in the ammoniation process of CPVC, replacing some chlorine atoms and introducing a quaternary ammonium salt structure, which has the ability to conduct conductive channels for a long time. It can effectively adsorb water molecules in the air and form conductive paths, thereby continuously releasing or neutralizing the accumulated static charge and promoting the rapid dispersion of charge. The modified heat stabilizer is based on polyamic acid 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 conductivity and antistatic properties of the material.

[0045] 3. The CPVC prepared by this invention enhances the thermal stability of the molecular chain through a chlorination process. Its high chlorine content releases hydrogen halides at high temperatures, inhibiting flame propagation. The antistatic filler loads functional particles onto the surface of graphene oxide through a hydrothermal reduction process, enhancing the flame-retardant substrate of the material. The modified heat stabilizer is based on polyamic acid, and the introduced phosphorus structure is formed in the molecular chain through an end-capping process. The phosphorus group decomposes to generate phosphoric acid during combustion, catalyzing the formation of a carbonized layer and blocking oxygen and heat transfer. At the same time, the coordination complexation of metal salt ions enhances thermal stability and further promotes the formation of non-flammable char residue. Furthermore, the modified heat stabilizer systematically interrupts the chain dechlorination reaction during pyrolysis through a stable complexation reaction with hydrogen chloride molecules, inhibiting the continuous production of hydrogen chloride from the source. This multi-inhibition strategy not only reduces gas diffusion through physical barriers but also consumes reactive sites through chemical bonding, ensuring a significant reduction in the release of hydrogen chloride, thereby effectively reducing its potential hazards to environmental pollution and human health and safety. Detailed Implementation

[0046] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

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

[0048] Example 1

[0049] This embodiment provides a method for preparing antistatic fillers for high wear-resistant and antistatic plastics based on CPVC modification, including the following steps:

[0050] Step ①: Preparation of ammoniated graphene

[0051] Weigh out 40.0 g of graphene oxide, 100.0 mL of deionized water and 100.0 mL of anhydrous ethanol and add them to the reaction vessel. Stir the mixture and raise the temperature of the reaction vessel to 60 °C. Then add 10.0 g of tris(2-aminoethyl)amine to the reaction vessel and keep it at this temperature for 40 min. After the reaction is complete, cool the reaction vessel to room temperature and centrifuge at 8000 rpm for 10 min. Discard the supernatant and wash the precipitate three times with deionized water and anhydrous ethanol. Finally, place the washed precipitate in a vacuum drying oven and dry it at 80 °C for 12 h to obtain ammoniated graphene.

[0052] Step 2: Preparation of antistatic filler

[0053] Weigh 40.0g of ammoniated graphene and 240.0mL of deionized water and add them to a high-pressure reactor. Under stirring, add 10.0g of zinc nitrate to the reactor. After the addition is complete, adjust the pH of the reaction system to 8 using a saturated sodium hydroxide aqueous solution. After stirring for 20min, seal the high-pressure reactor and raise the temperature of the reactor to 140℃. Maintain the temperature for 10h. After the reaction is complete, cool the reactor to room temperature and centrifuge at 8000rpm for 10min. Discard the supernatant and wash the precipitate three times with deionized water and anhydrous ethanol. Finally, place the washed precipitate in a vacuum drying oven and dry it at 80℃ for 12h to obtain the antistatic filler.

[0054] Example 2

[0055] This embodiment provides a method for preparing antistatic fillers for high wear-resistant and antistatic plastics based on CPVC modification, including the following steps:

[0056] Step ①: Preparation of ammoniated graphene

[0057] Weigh out 50.0 g of graphene oxide, 120.0 mL of deionized water and 120.0 mL of anhydrous ethanol and add them to the reaction vessel. Stir the mixture and raise the temperature of the reaction vessel to 80 °C. Then add 20.0 g of tris(2-aminoethyl)amine to the reaction vessel and keep it at this temperature for 60 min. After the reaction is complete, cool the reaction vessel to room temperature and centrifuge at 8000 rpm for 10 min. Discard the supernatant and wash the precipitate 5 times with deionized water and anhydrous ethanol. Finally, place the washed precipitate in a vacuum drying oven and dry it at 80 °C for 12 h to obtain ammoniated graphene.

[0058] Step 2: Preparation of antistatic filler

[0059] Weigh 50.0g of ammoniated graphene and 300.0mL of deionized water and add them to a high-pressure reactor. Under stirring, add 10.0g of zinc nitrate to the reactor. After the addition is complete, adjust the pH of the reaction system to 10 using a saturated sodium hydroxide aqueous solution. After stirring for 30min, seal the high-pressure reactor and raise the temperature of the reactor to 160℃. Maintain the temperature for 12h. After the reaction is complete, cool the reactor to room temperature and centrifuge at 8000rpm for 10min. Discard the supernatant and wash the precipitate 5 times with deionized water and anhydrous ethanol. Finally, place the washed precipitate in a vacuum drying oven and dry it at 80℃ for 12h to obtain the antistatic filler.

[0060] Example 3

[0061] This embodiment provides a method for preparing antistatic fillers for high wear-resistant and antistatic plastics based on CPVC modification, including the following steps:

[0062] Step ①: Preparation of ammoniated graphene

[0063] Weigh out 45.0 g of graphene oxide, 120.0 mL of deionized water and 100.0 mL of anhydrous ethanol and add them to the reaction vessel. Stir the mixture and raise the temperature of the reaction vessel to 70 °C. Then add 16.0 g of tris(2-aminoethyl)amine to the reaction vessel and keep it at this temperature for 50 min. After the reaction is complete, cool the reaction vessel to room temperature and centrifuge at 8000 rpm for 10 min. Discard the supernatant and wash the precipitate four times with deionized water and anhydrous ethanol. Finally, place the washed precipitate in a vacuum drying oven and dry it at 80 °C for 12 h to obtain ammoniated graphene.

[0064] Step 2: Preparation of antistatic filler

[0065] Weigh 45.0g of ammoniated graphene and 270.0mL of deionized water and add them to a high-pressure reactor. Under stirring, add 10.0g of zinc nitrate to the reactor. After the addition is complete, adjust the pH of the reaction system to 9 using a saturated sodium hydroxide aqueous solution. After stirring for 25min, seal the high-pressure reactor and raise the temperature of the reactor to 150℃. Maintain the temperature for 12h. After the reaction is complete, cool the reactor to room temperature and centrifuge at 8000rpm for 10min. Discard the supernatant and wash the precipitate four times with deionized water and anhydrous ethanol. Finally, place the washed precipitate in a vacuum drying oven and dry it at 80℃ for 12h to obtain the antistatic filler.

[0066] Example 4

[0067] This embodiment provides a method for preparing modified CPVC for the production of high wear-resistant and antistatic plastics based on CPVC modification, including the following steps:

[0068] Step 1: Preparation of CPVC

[0069] Weigh out 20.0g of PVC powder, 100.0mL of deionized water, 2.0g of talc, and 3.0g of benzoyl peroxide and add them to the reactor. After purging the air with nitrogen, use a vacuum pump to extract the gas in the reactor until the pressure drops to a negative pressure of 0.1MPa. Then, introduce chlorine gas into the reactor, control the internal pressure to 0.3MPa, and seal the reactor. Continue to raise the temperature of the reactor to 85℃ and maintain the temperature for 5 hours. After the reaction is complete, wait for the temperature of the reactor to drop to room temperature. Adjust the reaction system to neutral using saturated sodium hydroxide, filter the reactor, collect the filter cake, wash it three times with anhydrous ethanol and deionized water, and then transfer the filter cake to a vacuum drying oven at 60℃ and vacuum dry it to constant weight to obtain CPVC.

[0070] Step 2: Preparation of hybrid CPVC

[0071] Weigh 16.0 g of CPVC and 200.0 mL of N,N-dimethylacetamide and add them to the reactor. Raise the reactor temperature to 80 °C and stir for 1 h. Then add 2.0 g of the antistatic packing prepared in Example 1 to the reactor and continue stirring for 3 h. After the reaction is complete, wait for the reactor temperature to drop to room temperature. Adjust the reaction system to neutral using saturated sodium hydroxide and transfer the reaction solution to a rotary evaporator at 100 °C. Evaporate under reduced pressure until no liquid is collected to obtain hybrid CPVC.

[0072] Step 3: Preparation of modified CPVC

[0073] Weigh out 10.0 g of bromoethane and 100.0 mL of N,N-dimethylformamide and mix them to obtain the modified solution;

[0074] Weigh 10.0 g of hybrid CPVC and 60.0 mL of N,N-dimethylformamide and add them to the reactor. After purging with nitrogen, raise the reactor temperature to 100 °C and stir for 20 min. Then add 0.5 g of triethylamine to the reactor and continue stirring for 5 min. Add 20 mL of the modified solution dropwise to the reactor and continue adding for 1 h. Stir for 3 h. After the reaction is complete, wait for the reactor temperature to drop to room temperature and transfer the reaction solution to a rotary evaporator at 100 °C. Evaporate under reduced pressure until no liquid is collected to obtain the modified CPVC.

[0075] Example 5

[0076] This embodiment provides a method for preparing modified CPVC for the production of high wear-resistant and antistatic plastics based on CPVC modification, including the following steps:

[0077] Step 1: Preparation of CPVC

[0078] Weigh out 30.0g of PVC powder, 120.0mL of deionized water, 2.0g of talc, and 5.0g of benzoyl peroxide and add them to the reactor. After purging the air with nitrogen, use a vacuum pump to extract the gas in the reactor until the pressure drops to a negative pressure of 0.1MPa. Then, introduce chlorine gas into the reactor, control the internal pressure to 0.3MPa, and seal the reactor. Continue to raise the temperature of the reactor to 95℃ and maintain the temperature for 7 hours. After the reaction is complete, wait for the temperature of the reactor to drop to room temperature. Adjust the reaction system to neutral using saturated sodium hydroxide, filter the reactor, collect the filter cake, wash it 5 times with anhydrous ethanol and deionized water, and then transfer the filter cake to a vacuum drying oven at 60℃ and vacuum dry it to constant weight to obtain CPVC.

[0079] Step 2: Preparation of hybrid CPVC

[0080] Weigh 20.0g of CPVC and 200.0mL of N,N-dimethylacetamide and add them to the reactor. Raise the reactor temperature to 90℃ and stir for 2 hours. Then add 4.0g of the antistatic packing prepared in Example 2 to the reactor and continue stirring for 4 hours. After the reaction is complete, wait for the reactor temperature to drop to room temperature. Adjust the reaction system to neutral using saturated sodium hydroxide and transfer the reaction solution to a rotary evaporator at 110℃. Evaporate under reduced pressure until no liquid is collected to obtain hybrid CPVC.

[0081] Step 3: Preparation of modified CPVC

[0082] Weigh out 20.0 g of bromoethane and 120.0 mL of N,N-dimethylformamide and mix them to obtain the modified solution;

[0083] Weigh 14.0 g of hybrid CPVC and 72.0 mL of N,N-dimethylformamide and add them to the reactor. After purging with nitrogen, raise the reactor temperature to 110 °C and stir for 20 min. Then add 1.6 g of triethylamine and stir for another 8 min. Add 24.0 mL of the modified solution dropwise for 2 h and stir for 4 h. After the reaction is complete, let the reactor temperature drop to room temperature and transfer the reaction solution to a rotary evaporator at 110 °C. Evaporate under reduced pressure until no liquid is collected to obtain the modified CPVC.

[0084] Example 6

[0085] This embodiment provides a method for preparing modified CPVC for the production of high wear-resistant and antistatic plastics based on CPVC modification, including the following steps:

[0086] Step 1: Preparation of CPVC

[0087] Weigh out 25.0g of PVC powder, 120.0mL of deionized water, 2.0g of talc, and 4.0g of benzoyl peroxide and add them to the reactor. After purging the air with nitrogen, use a vacuum pump to extract the gas in the reactor until the pressure drops to a negative pressure of 0.1MPa. Then, introduce chlorine gas into the reactor, control the internal pressure to 0.3MPa, and seal the reactor. Continue to raise the temperature of the reactor to 90℃ and maintain the temperature for 6 hours. After the reaction is complete, wait for the temperature of the reactor to drop to room temperature. Adjust the reaction system to neutral using saturated sodium hydroxide, filter the reactor, collect the filter cake, wash it four times with anhydrous ethanol and deionized water, and then transfer the filter cake to a vacuum drying oven at 60℃ and vacuum dry it to constant weight to obtain CPVC.

[0088] Step 2: Preparation of hybrid CPVC

[0089] Weigh out 18.0 g of CPVC and 200.0 mL of N,N-dimethylacetamide and add them to the reactor. Raise the reactor temperature to 90 °C and stir for 2 h. Then add 3.0 g of the antistatic packing prepared in Example 3 to the reactor and continue stirring for 3 h. After the reaction is complete, wait for the reactor temperature to drop to room temperature. Adjust the reaction system to neutral using saturated sodium hydroxide and transfer the reaction solution to a rotary evaporator at 110 °C. Evaporate under reduced pressure until no liquid is collected to obtain hybrid CPVC.

[0090] Step 3: Preparation of modified CPVC

[0091] Weigh out 16.0 g of bromoethane and 100.0 mL of N,N-dimethylformamide and mix them to obtain the modified solution;

[0092] Weigh 12.0 g of hybrid CPVC and 64.0 mL of N,N-dimethylformamide and add them to the reactor. After purging with nitrogen, raise the reactor temperature to 110 °C and stir for 24 min. Then, add 1.2 g of triethylamine to the reactor and continue stirring for 6 min. Next, add 21.0 mL of the modified solution dropwise to the reactor and continue adding for 2 h. Then, stir for 4 h. After the reaction is complete, wait for the reactor temperature to drop to room temperature and transfer the reaction solution to a rotary evaporator at 110 °C. Evaporate under reduced pressure until no liquid is collected to obtain the modified CPVC.

[0093] Example 7

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

[0095] Step 1: Preparation of modified polyamic acid

[0096] Weigh 40.0 g of 6-methyl-1,3,5-triazine-2,4-diamine and 300.0 mL of N,N-dimethylformamide and add them to a reactor at 5°C. After stirring at this temperature until all the reactants are dissolved, add 1.1 times the molar amount of 6-methyl-1,3,5-triazine-2,4-diamine of 4,4'-oxophthalic anhydride to the reactor. After the addition is complete, raise the temperature of the reactor to 30°C and keep it at this temperature for 2 hours. Then add 3.0 g of (3-aminopropyl)diethyl phosphate to the reactor and keep it at this temperature for 20 minutes. After the reaction is complete, wait for the temperature of the reactor to drop to room temperature, and then transfer the reaction solution to a rotary evaporator at 100°C. Evaporate under reduced pressure until no liquid is collected to obtain modified polyamic acid.

[0097] Step 2: Preparation of modified heat stabilizer

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

[0099] Weigh out 40.0 g of modified polyamic acid and 200.0 mL of N,N-dimethylformamide and add them to the reaction vessel. Stir the mixture and raise the temperature of the reaction vessel to 70°C. Adjust the pH of the reaction system to 8 using a saturated sodium hydroxide aqueous solution. Then add 100.0 mL of the composite modification solution to the reaction vessel and keep it at the temperature for 2 hours. After the reaction is complete, wait for the temperature of the reaction vessel to drop to room temperature and transfer the reaction solution to a rotary evaporator at 100°C. Evaporate under reduced pressure until no liquid is collected to obtain the modified heat stabilizer.

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

[0101] 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 zones 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 motor speed of the twin-screw extruder was 120 rpm, and the pressure was 80 bar. After melt extrusion and natural curing, CPVC-based plastic was obtained.

[0102] Example 8

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

[0104] Step 1: Preparation of modified polyamic acid

[0105] Weigh 50.0 g of 6-methyl-1,3,5-triazine-2,4-diamine and 360.0 mL of N,N-dimethylformamide and add them to a reaction vessel at 0 °C. After stirring at this temperature until all the reactants are dissolved, add 1.2 times the molar amount of 6-methyl-1,3,5-triazine-2,4-diamine of 4,4'-oxophthalic anhydride to the reaction vessel. After the addition is complete, raise the temperature of the reaction vessel to 50 °C and keep it at this temperature for 4 h. Then add 4.0 g of (3-aminopropyl)diethyl phosphate to the reaction vessel and keep it at this temperature for 25 min. After the reaction is complete, wait for the temperature of the reaction vessel to drop to room temperature, and then transfer the reaction solution to a rotary evaporator at 110 °C. Evaporate under reduced pressure until no liquid is collected to obtain modified polyamic acid.

[0106] Step 2: Preparation of modified heat stabilizer

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

[0108] Weigh out 50.0g of modified polyamic acid and 240.0mL of N,N-dimethylformamide and add them to the reaction vessel. Stir the mixture and raise the temperature of the reaction vessel to 90℃. Adjust the pH of the reaction system to 10 using a saturated sodium hydroxide aqueous solution. Then add 120.0mL of the composite modification solution to the reaction vessel and keep it at the temperature for 3 hours. After the reaction is completed, wait for the temperature of the reaction vessel to drop to room temperature and transfer the reaction solution to a rotary evaporator at 110℃. Evaporate under reduced pressure until no liquid is collected to obtain the modified heat stabilizer.

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

[0110] 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 to the discharge port were 180°C, 185°C, 185°C, 190°C, 190°C, 200°C, and 200°C, respectively. The main motor speed of the twin-screw extruder was 160 rpm, and the pressure was 120 bar. After melt extrusion and natural curing, CPVC-based plastic was obtained.

[0111] Example 9

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

[0113] Step 1: Preparation of modified polyamic acid

[0114] Weigh 45.0 g of 6-methyl-1,3,5-triazine-2,4-diamine and 320.0 mL of N,N-dimethylformamide and add them to a reaction vessel at 3°C. After stirring at this temperature until all the reactants are dissolved, add 1.2 times the molar amount of 6-methyl-1,3,5-triazine-2,4-diamine of 4,4'-oxophthalic anhydride to the reaction vessel. After the addition is complete, raise the temperature of the reaction vessel to 40°C and keep it at this temperature for 3 hours. Then add 4.0 g of (3-aminopropyl)diethyl phosphate to the reaction vessel and keep it at this temperature for 25 minutes. After the reaction is complete, wait for the temperature of the reaction vessel to drop to room temperature, and then transfer the reaction solution to a rotary evaporator at 110°C. Evaporate under reduced pressure until no liquid is collected to obtain modified polyamic acid.

[0115] Step 2: Preparation of modified heat stabilizer

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

[0117] Weigh out 45.0 g of modified polyamic acid and 210.0 mL of N,N-dimethylformamide and add them to the reaction vessel. Stir the mixture and raise the temperature of the reaction vessel to 80°C. Adjust the pH of the reaction system to 9 using a saturated sodium hydroxide aqueous solution. Then add 120.0 mL of the composite modification solution to the reaction vessel and keep it at the temperature for 3 hours. After the reaction is complete, wait for the temperature of the reaction vessel to drop to room temperature and transfer the reaction solution to a rotary evaporator at 110°C. Evaporate under reduced pressure until no liquid is collected to obtain the modified heat stabilizer.

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

[0119] By weight, 96 parts of the modified CPVC prepared in Example 6, 7 parts of the 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 to the discharge port were 180°C, 185°C, 185°C, 190°C, 190°C, 200°C, and 200°C, respectively. The main motor speed of the twin-screw extruder was 150 rpm, and the pressure was 100 bar. After melt extrusion and natural curing, CPVC-based plastic was obtained.

[0120] Comparative Example 1

[0121] The difference between this comparative example and Example 9 is that step (i) of the modified CPVC used in step three is omitted during the preparation process, and PVC powder is used to replace CPVC in an equal amount 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 three, the antistatic filler is omitted and replaced with an equal amount of tris(2-aminoethyl)amine.

[0124] Comparative Example 3

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

[0126] Data Analysis:

[0127] The volumetric abrasion 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 abrasion resistance of vulcanized rubber or thermoplastic rubber (rotary roller abrasion tester method)".

[0128] The antistatic properties of the CPVC-based plastics prepared in Examples 7-9 and Comparative Examples 1-3 were tested in accordance with 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 process of CPVC-based plastics prepared in Examples 7-9 and Comparative Examples 1-3 was determined in accordance with standard HJ 549-2016 "Determination of hydrogen chloride in ambient air and exhaust gas by ion chromatography".

[0130] The vertical flammability ratings of the CPVC-based plastic insulating cable materials prepared in Examples 7-9 and Comparative Examples 1-3 were determined according to standard GB / T 2408-2021 "Determination of the flammability of plastics - Horizontal and Vertical Methods"; specific data are shown in Table 1.

[0131] Table 1 - Performance Test Data for Each Sample

[0132]

[0133]

[0134] Performance testing:

[0135] Comparative analysis of the data in Table 1 reveals that the CPVC-based plastic prepared by this invention has a volumetric wear of 3.5 mm and a volume resistivity of 3.5 × 10⁻⁶. 4 Simultaneously, the vertical combustion rating of Ω·m is V-0, and all data are superior to the comparative example;

[0136] Comparative analysis of the data in Table 1 reveals that the wear resistance, antistatic properties, and flame retardant properties of the CPVC-based plastic prepared in Comparative Example 1 are significantly reduced. This indicates that replacing CPVC with PVC powder lacks chlorination modification, resulting in reduced polymer chain thermal stability. The polymer chain softens and wears more easily after heating, causing the material to lose its required strength under frictional conditions and significantly reducing wear resistance. Furthermore, although antistatic fillers are retained, the matrix is ​​composed of unchlorinated PVC, leading to poor interfacial bonding, unstable conductive network construction, and blocked electron migration paths. This results in unstable overall antistatic properties that are easily affected by the environment. Simultaneously, CPVC has a high chlorine content, effectively inhibiting combustion. However, the chlorine content is reduced after using PVC as a substitute, making it easier to generate flammable gases during combustion. The lack of a synergistic flame retardant system significantly degrades the material's flame retardant rating.

[0137] Comparative analysis of the data in Table 1 reveals that the CPVC-based plastic prepared in Comparative Example 2 exhibits significantly reduced wear resistance, antistatic properties, flame retardancy, and environmental performance. This indicates that the lack of graphene-based fillers weakens the polymer matrix structure, reduces the material's mechanical properties, and makes it more prone to microcracks under wear stress, resulting in poor wear resistance. Furthermore, the absence of antistatic fillers deprives the material of a crucial conductive network structure; even with tris(2-aminoethyl)amine as a substitute, the surface charge cannot be evenly distributed, significantly reducing antistatic capacity. Simultaneously, graphene forms a carbon layer during combustion, shielding the heat source from oxygen and contributing to flame retardancy. Removing this component eliminates this synergistic flame-retardant mechanism, leading to enhanced pyrolysis and increased flame spread. Moreover, graphene-based fillers can form a stable carbon layer at high temperatures, effectively blocking the contact between the heat source and oxygen, thus slowing down the pyrolysis process and reducing the release of harmful gases.

[0138] A comparative analysis of the data in Table 1 reveals that the CPVC-based plastic prepared in Comparative Example 3 exhibits significantly reduced wear resistance, flame retardancy, and environmental friendliness. This indicates that the absence of a modified heat stabilizer makes the material more susceptible to thermal degradation during extrusion processing, leading to polymer chain breakage, decreased physical properties, rough surface of the molded product, and significantly deteriorated wear resistance. The modified heat stabilizer contains phosphorus-based and metal complex components, which play a crucial role in combustion inhibition. Its absence directly reduces the ability to control thermal decomposition products, accelerates flame spread, and decreases flame retardancy. Furthermore, 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, adversely affecting both the environment and equipment, resulting in a significantly insufficient environmental friendliness during the processing.

[0139] In conclusion, this solution achieves dual optimization in structure and performance through the synergistic blending of various functional materials. The introduction of ammoniated graphene forms a good interfacial bond with the CPVC matrix, which not only improves the stability of the conductive network but also enhances the mechanical support structure. The modified heat stabilizer effectively complexes with the CPVC segments, enhancing the material's thermal stability and aging resistance while inhibiting degradation reactions during processing. The flame-retardant components and fillers together construct a dual mechanism of thermal shielding and gas-phase flame retardancy, significantly improving the overall flame retardancy rating. On this basis, the components are not only physically tightly interlocked but also establish a stable composite network through chemical bonding, enabling the CPVC-based plastic prepared by this invention to exhibit excellent synergistic performance.

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

[0141] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above 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 one or more embodiments or examples.

[0142] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-wear-resistant and antistatic plastic based on CPVC modification, characterized in that, It comprises the following raw materials in parts by weight: 80-100 parts modified CPVC, 6-8 parts modified heat stabilizer and 8-16 parts auxiliary materials; The excipients consist of the following raw materials in parts by weight: 5-10 parts plasticizer, 1-2 parts antioxidant, 1-2 parts light stabilizer and 1-2 parts lubricant; The modified CPVC is prepared as follows: hybrid CPVC and N,N-dimethylformamide are added to a reaction vessel. After nitrogen protection, the temperature of the reaction vessel is raised to 100-110℃ and stirred for 20-25 min. Then, triethylamine is added to the reaction vessel and stirred for another 5-8 min. Finally, the modified solution is added dropwise to the reaction vessel and stirred for 1-2 h. After stirring for 3-4 h, the modified CPVC is obtained by post-treatment. The modified solution is a mixture of bromoethane and N,N-dimethylformamide at a ratio of 1-2 g: 10-12 mL. The preparation method of the hybrid CPVC includes the following steps: A1. Add PVC powder, deionized water, talc powder and benzoyl peroxide to the reactor. After purging the air by introducing nitrogen, use a vacuum pump to extract the gas in the reactor until the pressure drops to a negative pressure of 0.1 MPa. Then, introduce chlorine gas into the reactor, control the internal pressure to 0.3 MPa and seal the reactor. Continue to raise the temperature of the reactor to 85-95℃ and keep it at that temperature for 5-7 hours. After post-processing, CPVC is obtained. A2. Add CPVC and N,N-dimethylacetamide to the reactor, raise the reactor temperature to 80-90℃, keep it warm and stir for 1-2 hours, add antistatic packing to the reactor, continue to keep it warm and stir for 3-4 hours, and then obtain hybrid CPVC after post-treatment. The method for preparing the antistatic filler includes the following steps: B1. Add graphene oxide, deionized water and anhydrous ethanol to a reaction vessel and stir. After the temperature of the reaction vessel is raised to 60-80℃, add tris(2-aminoethyl)amine to the reaction vessel and keep the reaction at the temperature for 40-60 min. After post-treatment, ammoniated graphene is obtained. B2. Add ammoniated graphene and deionized water to a high-pressure reactor. Add zinc nitrate to the reactor while stirring. After the addition is complete, adjust the pH of the reaction system to 8-10 using a saturated sodium hydroxide aqueous solution. Stir for 20-30 minutes, then seal the high-pressure reactor and raise the temperature of the reactor to 140-160℃. Maintain the temperature for 10-12 hours. Post-processing yields the antistatic filler.

2. The high wear-resistant and antistatic plastic based on CPVC modification according to claim 1, characterized in that, In the preparation of modified CPVC, the ratio of hybrid CPVC, N,N-dimethylformamide, triethylamine and modification solution is 5-7g:30-36mL:0.5-0.8g:10-12mL.

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

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

5. The high wear-resistant and antistatic plastic based on CPVC modification according to claim 1, characterized in that, The preparation method of the modified heat stabilizer includes the following steps: C1. 6-Methyl-1,3,5-triazine-2,4-diamine and N,N-dimethylformamide are added to a reaction vessel at a temperature of 0-5℃. After stirring at this temperature until all the reactants are dissolved, a calculated amount of 4,4'-oxophthalic anhydride is added to the reaction vessel. After the addition is complete, the temperature of the reaction vessel is steadily raised to 30-50℃ and the reaction is maintained at this temperature for 2-4 hours. Then, a capping agent is added to the reaction vessel and the reaction is maintained at this temperature for 20-30 minutes. The post-treatment yields modified polyamic acid, wherein the capping agent is diethyl (3-aminopropyl)phosphate. C2. Modified polyamic acid and N,N-dimethylformamide are added to a reaction vessel and stirred. After the temperature of the reaction vessel is raised to 70-90℃, the pH of the reaction system is adjusted to 8-10 using a saturated sodium hydroxide aqueous solution. Then, a composite modification solution is added to the reaction vessel, and the reaction is kept at the temperature for 2-3 hours. The modified heat stabilizer is obtained by post-treatment. The composite modification solution is a mixture of calcium chloride, zinc nitrate, and deionized water in a ratio of 1-2g:1-2g:10-12mL.

6. The high wear-resistant and antistatic plastic based on CPVC modification according to claim 5, characterized in that, In step C1, the ratio of 6-methyl-1,3,5-triazine-2,4-diamine, N,N-dimethylformamide, and capping agent is 4-5g:30-36mL:0.3-0.5g, wherein the amount of 4,4'-oxophthalic anhydride is 1.1-1.2 times the molar amount of 6-methyl-1,3,5-triazine-2,4-diamine; in step C2, the ratio of modified polyamic acid, N,N-dimethylformamide, and composite modification solution is 4-5g:20-24mL:10-12mL.

7. The method for preparing high wear-resistant and antistatic plastic based on CPVC modification as described in any one of claims 1-6, characterized in that, The preparation method of the high wear-resistant and antistatic plastic based on CPVC modification is as follows: modified CPVC, modified heat stabilizer, plasticizer, antioxidant, light stabilizer and lubricant are added to a twin-screw extruder, melt extruded and naturally cured to obtain CPVC-based plastic.

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