A PVC toughening agent and preparation method thereof

Abstract

The present invention relates to the technical field of PVC materials, and in particular to a PVC toughening agent and a preparation method thereof. The PVC toughening agent comprises the following components by weight: 5 to 12 parts of ACR impact modifier, 25 to 50 parts of inorganic filler, 8 to 15 parts of chlorinated polyethylene, 12 to 33 parts of modified nitrile rubber, 7 to 16 parts of surface modified glass fiber, and 4 to 10 parts of silicon carbide whiskers. The PVC toughening agent prepared by the present invention can quickly promote the gelation of PVC, so that the PVC material has better wear resistance and compressive strength, improves the stability of the PVC toughening agent, makes the nanoparticles dispersed evenly, achieves the function of accelerating the plasticization of PVC, and improves the processing performance of PVC.

Description

Technical Field

[0001] The invention relates to the technical field of PVC materials, and in particular to a PVC toughening agent and a preparation method thereof. Background Art

[0002] Polyvinyl chloride, the full name of which is PolyvinylChloride, is abbreviated as PVC in English. However, traditional PVC products have poor toughness and are prone to breakage, especially in low temperature environments, which greatly limits the application scope of PVC.

[0003] PVC is easy to decompose during pure processing, has poor fluidity, low impact strength and poor weather resistance, so it is necessary to add various auxiliary materials during the processing to improve its performance. For example: lubricants, heat stabilizers, impact modifiers and processing aids. Processing aids have different functions according to different relative molecular weights. Processing aids with relative molecular weights of 600,000-1.6 million are widely used in the processing of ordinary products, such as ACR-201, 301, 401, etc.; processing aids with relative molecular weights above 1.6 million are widely used in blow molding and rigid PVC foam products, such as ACR-530; the main functions of processing aids are: to accelerate the plasticization process of PVC; to improve the mechanical properties of the melt under the thermoelastic state; to improve the appearance quality of the product and other comprehensive functions. At present, the PVC modifiers on the market are still mainly foreign products, with high costs and unstable toughening effects.

[0004] The existing PVC toughening agents have the following main technical problems: (1) The toughening effect of PVC toughening agents is often unstable during use, which leads to large fluctuations in the performance of PVC products and makes it difficult to achieve the expected toughening effect; (2) The production cost of PVC toughening agents is high, which increases the production cost of PVC products and limits its application in certain fields; (3) When using nano-CaCO3 for PVC toughening modification, the nanoparticles tend to aggregate in the plastic matrix, resulting in uneven dispersion and affecting the toughening effect; (4) Although elastomer toughening plastic technology can improve the impact resistance of PVC, it is often accompanied by problems such as decreased material strength, weakened rigidity, lowered heat deformation temperature and poor processing fluidity. Summary of the invention

[0005] The purpose of the present invention is to provide a PVC toughening agent and a preparation method thereof. The prepared PVC toughening agent can quickly promote PVC gelation, so that the PVC material has better wear resistance and compressive strength, improves the stability of the PVC toughening agent, makes nanoparticles dispersed evenly, achieves the function of accelerating the plasticization of PVC, and improves the processing performance of PVC.

[0006] A PVC toughening agent, comprising the following components in parts by weight:

[0007] 5-12 parts of ACR impact modifier, 25-50 parts of inorganic filler, 8-15 parts of chlorinated polyethylene, 12-33 parts of modified nitrile rubber, 7-16 parts of surface modified glass fiber, 4-10 parts of silicon carbide whisker;

[0008] The surface-modified glass fiber is obtained by modifying the surface of the glass fiber with graphene and a silane coupling agent.

[0009] The PVC toughening agent according to claim 1, characterized in that the PVC toughening agent comprises the following components in parts by weight:

[0010] 6-10 parts of ACR impact modifier, 35-45 parts of inorganic filler, 10-15 parts of chlorinated polyethylene, 19-30 parts of modified nitrile rubber, 8-15 parts of surface modified glass fiber, and 4-6 parts of silicon carbide whiskers.

[0011] In a preferred embodiment of the present invention, in the surface-modified glass fiber, the mass ratio of graphene, silane coupling agent and glass fiber is 0.5-3:1-2:5-10.

[0012] In a preferred embodiment of the present invention, the modified nitrile rubber is composed of nano zinc oxide, dibutyl phthalate, stearic acid and nitrile rubber, and is prepared by mixing nano zinc oxide, dibutyl phthalate and stearic acid to modify the nitrile rubber.

[0013] In a preferred embodiment of the present invention, the mass ratio of nano zinc oxide, dibutyl phthalate, stearic acid and nitrile rubber in the modified nitrile rubber is 1-2:0.5-1:2-3:3-4.

[0014] In a preferred embodiment of the present invention, the average particle size of the silicon carbide whisker is 80 microns, the compressive strength is 100 MPa, and the density is 0.25 g / cm 3 .

[0015] In a preferred embodiment of the present invention, the inorganic filler is one or more of nano-TiO2, nano-SiC, and nano-Si3N4.

[0016] In a preferred embodiment of the present invention, the particle size of the inorganic filler is 1-50 nm.

[0017] Another object of the present invention is to provide a method for preparing the PVC toughening agent described in any one of the above items, comprising the following steps:

[0018] Weigh the following raw materials in parts by weight: 5-12 parts of ACR impact modifier, 25-50 parts of inorganic filler, 8-15 parts of chlorinated polyethylene, 12-33 parts of modified nitrile rubber, 7-16 parts of surface modified glass fiber, and 4-10 parts of silicon carbide whisker;

[0019] The modified nitrile rubber and the surface-modified glass fiber are uniformly mixed to obtain a copolymer;

[0020] Dispersing silicon carbide whiskers, ACR impact modifier, inorganic filler and chlorinated polyethylene, and mixing them uniformly to obtain a mixture;

[0021] The prepared mixed material is mixed with the copolymer and ground, and after being mixed evenly, a PVC toughening agent is prepared.

[0022] The third object of the present invention is to provide a PVC material, wherein the PVC material comprises the following components by weight:

[0023] 65-100 parts of polyvinyl chloride resin, 20-30 parts of PVC toughening agent, 4-10 parts of rubber reinforcing agent, 0.5-1 part of antioxidant, and 0.2-1 part of lubricant.

[0024] Preferably, the following components are included in parts by weight:

[0025] 85-100 parts of polyvinyl chloride resin, 20-25 parts of PVC toughening agent, 4-8 parts of rubber reinforcing agent, 0.5-1 part of antioxidant, and 0.5-1 part of lubricant.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The PVC toughening agent prepared by the present invention can quickly promote the gelation of PVC, so that the PVC material has better wear resistance and compressive strength, improves the stability of the PVC toughening agent, makes the nanoparticles dispersed evenly, achieves the function of accelerating the plasticization of PVC, improves the processing performance of PVC, and solves the problems of high cost and unstable toughening effect of existing PVC toughening agents;

[0028] 2. The present invention obtains a copolymer by uniformly mixing modified nitrile rubber and surface-modified glass fiber, so that an interpenetrating network structure is formed between the nitrile rubber molecular chain and the polyvinyl chloride molecular chain, so that the polyvinyl chloride material system has a higher structural density, and with the unique toughening effect of rubber, the prepared surface-modified glass fiber can show more excellent mechanical properties. In addition, the combination of the rubber molecular chain structure with the silane coupling agent and the glass fiber can not only enhance the heat resistance of the polyvinyl chloride material, but also utilize the silicon oxide produced after the combustion of the silicon element to further enhance the flame retardant properties of the polyvinyl chloride material, reduce the generation of harmful substances, and improve the environmental protection level of the polyvinyl chloride material;

[0029] 3. The ACR impact modifier in the present invention cooperates with the silicon carbide whisker to form similar anchor points, i.e., cross-linking points, between the surface-modified glass fiber and the PVC matrix resin, thereby improving the bonding state between the glass fiber and the resin and reducing the separation of the glass fiber and the resin. As the thickness of the mechanical action layer between the glass fiber and the matrix resin increases, the matrix near the surface of the glass fiber is more prone to shear yielding, thereby increasing the absorption and dissipation of impact energy and promoting the toughening effect of the glass fiber on the matrix resin. DETAILED DESCRIPTION

[0030] The following is a detailed description of the technical solutions in the embodiments of the present invention in combination with preferred embodiments and data. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that all professional terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention. Unless otherwise specifically stated, various raw materials, reagents, instruments and equipment used in the following embodiments of the present invention can be purchased from the market or prepared by existing methods.

[0032] The raw materials used in the present invention can be obtained through commercial purchase.

[0033] Example 1

[0034] A PVC toughening agent, the raw materials include the following components by weight percentage:

[0035] ACR impact modifier 5g,

[0036] Inorganic filler 25g,

[0037] Chlorinated polyethylene 8g,

[0038] Modified nitrile rubber 12g,

[0039] Surface modified glass fiber 7g,

[0040] Silicon carbide whiskers 4g.

[0041] The mass ratio of nano zinc oxide, dibutyl phthalate, stearic acid and nitrile rubber in the modified nitrile rubber is 1:1:2:3, and the modified nitrile rubber is prepared by mixing nano zinc oxide, dibutyl phthalate and stearic acid;

[0042] The surface-modified glass fiber is prepared by modifying the surface of the glass fiber with graphene and a silane coupling agent, wherein the mass ratio of graphene, silane coupling agent and glass fiber in the surface-modified glass fiber is 3:2:10, wherein the silane coupling agent is KH-550;

[0043] The inorganic filler is a mixture of nano-TiO2, nano-SiC and nano-Si3N4 in a mass ratio of 1:1:1, and the particle size of the inorganic filler is 30 nm;

[0044] The preparation method of the PVC toughening agent comprises the following steps:

[0045] (1) Weigh the above raw materials in parts by weight;

[0046] (2) uniformly mixing the modified nitrile rubber and the surface modified glass fiber to obtain a copolymer;

[0047] (3) dispersing silicon carbide whiskers, ACR impact modifier, inorganic filler and chlorinated polyethylene, and mixing them uniformly to obtain a mixture;

[0048] (4) The obtained mixture is mixed with the copolymer and ground, and after mixing evenly, a PVC toughening agent is obtained.

[0049] Example 2

[0050] A PVC toughening agent, the raw materials include the following components by weight percentage:

[0051] ACR impact modifier 10g,

[0052] Inorganic filler 32g,

[0053] Chlorinated polyethylene 10g,

[0054] Modified nitrile rubber 30g,

[0055] Surface modified glass fiber 9g,

[0056] 8g of silicon carbide whiskers.

[0057] The mass ratio of nano zinc oxide, dibutyl phthalate, stearic acid and nitrile rubber in the modified nitrile rubber is 1:1:2:4, and the modified nitrile rubber is prepared by mixing nano zinc oxide, dibutyl phthalate and stearic acid;

[0058] The surface-modified glass fiber is prepared by modifying the surface of the glass fiber with graphene and a silane coupling agent. The mass ratio of graphene, silane coupling agent and glass fiber in the surface-modified glass fiber is 3:1:5, wherein the silane coupling agent is KH-550.

[0059] The inorganic filler is a mixture of nano-TiO2, nano-SiC and nano-Si3N4 in a mass ratio of 1:1:1, and the particle size of the inorganic filler is 40nm;

[0060] The preparation method of the PVC toughening agent comprises the following steps:

[0061] (1) Weigh the above raw materials in parts by weight;

[0062] (2) uniformly mixing the modified nitrile rubber and the surface modified glass fiber to obtain a copolymer;

[0063] (3) dispersing silicon carbide whiskers, ACR impact modifier, inorganic filler and chlorinated polyethylene, and mixing them uniformly to obtain a mixture;

[0064] (4) The obtained mixture is mixed with the copolymer and ground, and after mixing evenly, a PVC toughening agent is obtained.

[0065] Example 3

[0066] A PVC toughening agent, the raw materials include the following components by weight percentage:

[0067] ACR impact modifier 6g,

[0068] Inorganic filler 30g,

[0069] Chlorinated polyethylene 9g,

[0070] Modified nitrile rubber 15g,

[0071] Surface modified glass fiber 8g,

[0072] Silicon carbide whiskers 6g.

[0073] The mass ratio of nano zinc oxide, dibutyl phthalate, stearic acid and nitrile rubber in the modified nitrile rubber is 1:1:3:3, and the modified nitrile rubber is prepared by mixing nano zinc oxide, dibutyl phthalate and stearic acid;

[0074] The surface-modified glass fiber is prepared by modifying the surface of the glass fiber with graphene and a silane coupling agent, wherein the mass ratio of the graphene to the silane coupling agent in the surface-modified glass fiber is 3:2:10, wherein the silane coupling agent is KH-550;

[0075] The inorganic filler is a mixture of nano-TiO2, nano-SiC and nano-Si3N4 in a mass ratio of 1:1:2, and the particle size of the inorganic filler is 30 nm;

[0076] The preparation method of the PVC toughening agent comprises the following steps:

[0077] (1) Weigh the above raw materials in parts by weight;

[0078] (2) uniformly mixing the modified nitrile rubber and the surface modified glass fiber to obtain a copolymer;

[0079] (3) dispersing silicon carbide whiskers, ACR impact modifier, inorganic filler and chlorinated polyethylene, and mixing them uniformly to obtain a mixture;

[0080] (4) The obtained mixture is mixed with the copolymer and ground, and after mixing evenly, a PVC toughening agent is obtained.

[0081] Example 4

[0082] A PVC toughening agent, the raw materials include the following components by weight percentage:

[0083] ACR impact modifier 12g,

[0084] Inorganic filler 32g,

[0085] Chlorinated polyethylene 15g,

[0086] Modified nitrile rubber 30g,

[0087] Surface modified glass fiber 11g,

[0088] Silicon carbide whiskers 7g.

[0089] The mass ratio of nano zinc oxide, dibutyl phthalate, stearic acid and nitrile rubber in the modified nitrile rubber is 1:1:2:4, and the modified nitrile rubber is prepared by mixing nano zinc oxide, dibutyl phthalate and stearic acid;

[0090] The surface-modified glass fiber is prepared by modifying the surface of the glass fiber with graphene and a silane coupling agent. The mass ratio of graphene, silane coupling agent and glass fiber in the surface-modified glass fiber is 3:1:5, wherein the silane coupling agent is KH-550.

[0091] The inorganic filler is a mixture of nano-TiO2, nano-SiC and nano-Si3N4 in a mass ratio of 1:1:1, and the particle size of the inorganic filler is 30 nm;

[0092] The preparation method of the PVC toughening agent comprises the following steps:

[0093] (1) Weigh the above raw materials in parts by weight;

[0094] (2) uniformly mixing the modified nitrile rubber and the surface modified glass fiber to obtain a copolymer;

[0095] (3) dispersing silicon carbide whiskers, ACR impact modifier, inorganic filler and chlorinated polyethylene, and mixing them uniformly to obtain a mixture;

[0096] (4) The obtained mixture is mixed with the copolymer and ground, and after mixing evenly, a PVC toughening agent is obtained.

[0097] Example 5

[0098] A PVC toughening agent, the raw materials include the following components by weight percentage:

[0099] ACR impact modifier 8g,

[0100] Inorganic filler 35g,

[0101] Chlorinated polyethylene 12g,

[0102] Modified nitrile rubber 28g,

[0103] Surface modified glass fiber 10g,

[0104] Silicon carbide whiskers 10g.

[0105] The mass ratio of nano zinc oxide, dibutyl phthalate, stearic acid and nitrile rubber in the modified nitrile rubber is 1:1:2:3, and the modified nitrile rubber is prepared by mixing nano zinc oxide, dibutyl phthalate and stearic acid;

[0106] The surface-modified glass fiber is prepared by modifying the surface of the glass fiber with graphene and a silane coupling agent, wherein the mass ratio of graphene, silane coupling agent and glass fiber in the surface-modified glass fiber is 3:2:10, wherein the silane coupling agent is KH-550;

[0107] The inorganic filler is a mixture of nano-TiO2, nano-SiC and nano-Si3N4 in a mass ratio of 1:1:1, and the particle size of the inorganic filler is 30 nm;

[0108] The preparation method of the PVC toughening agent comprises the following steps:

[0109] (1) Weigh the above raw materials in parts by weight;

[0110] (2) uniformly mixing the modified nitrile rubber and the surface modified glass fiber to obtain a copolymer;

[0111] (3) dispersing silicon carbide whiskers, ACR impact modifier, inorganic filler and chlorinated polyethylene, and mixing them uniformly to obtain a mixture;

[0112] (4) The obtained mixture is mixed with the copolymer and ground, and after mixing evenly, a PVC toughening agent is obtained.

[0113] Example 6

[0114] A PVC toughening agent, comprising the following components:

[0115] ACR impact modifier 6g,

[0116] Inorganic filler 27g,

[0117] Chlorinated polyethylene 15g,

[0118] Modified nitrile rubber 33g,

[0119] Surface modified glass fiber 16g,

[0120] Silicon carbide whiskers 9g.

[0121] The mass ratio of nano zinc oxide, dibutyl phthalate, stearic acid and nitrile rubber in the modified nitrile rubber is 1:0.5:2:3, and the modified nitrile rubber is prepared by mixing nano zinc oxide, dibutyl phthalate and stearic acid;

[0122] The surface-modified glass fiber is prepared by modifying the surface of the glass fiber with graphene and a silane coupling agent. The mass ratio of graphene, silane coupling agent and glass fiber in the surface-modified glass fiber is 3:2:5, wherein the silane coupling agent is KH-550.

[0123] The inorganic filler is a mixture of nano-TiO2, nano-SiC and nano-Si3N4 in a mass ratio of 1:1:1, and the particle size of the inorganic filler is 30 nm;

[0124] The preparation method of the PVC toughening agent comprises the following steps:

[0125] (1) Weigh the above raw materials in parts by weight;

[0126] (2) uniformly mixing the modified nitrile rubber and the surface modified glass fiber to obtain a copolymer;

[0127] (3) dispersing silicon carbide whiskers, ACR impact modifier, inorganic filler and chlorinated polyethylene, and mixing them uniformly to obtain a mixture;

[0128] (4) The obtained mixture is mixed with the copolymer and ground, and after mixing evenly, a PVC toughening agent is obtained.

[0129] The nanoparticles in the modified nitrile rubber and the silane coupling agent KH-550 in the surface-modified glass fiber combine with each other, making the formed copolymer more stable. The carboxyl group (-COOH) in the stearic acid reacts with the hydroxyl group (-OH) on the surface of the inorganic filler powder, making the inorganic filler more stable.

[0130] The methacryloyloxy group (-OCH=CH2) in the silane coupling agent reacts with the hydroxyl group on the surface of the inorganic filler powder to form a stable chemical bond. The dispersibility and compatibility of graphene in the polymer matrix are significantly improved, which enables the modified graphene to be better dispersed in the PVC toughening agent, thereby improving the performance of the PVC toughening agent.

[0131] Comparative Example 1

[0132] A PVC toughening agent was prepared according to the method of Example 2, except that no modified nitrile rubber was added.

[0133] Comparative Example 2

[0134] A PVC toughening agent was prepared according to the method of Example 2, except that the modified nitrile rubber was replaced by ordinary nitrile rubber.

[0135] Comparative Example 3

[0136] A PVC toughening agent was prepared according to the method of Example 2, except that no surface-modified glass fiber was added.

[0137] Comparative Example 4

[0138] A PVC toughening agent was prepared according to the method of Example 2, except that the surface-modified glass fiber was replaced by ordinary glass fiber.

[0139] Comparative Example 5

[0140] A PVC toughening agent was prepared according to the method of Example 2, except that no silicon carbide whiskers were added.

[0141] Application Examples

[0142] A PVC material, comprising the following components:

[0143] 100g of polyvinyl chloride resin, 30g of PVC toughening agent, 10g of rubber reinforcing agent, 1g of antioxidant, and 1g of lubricant; wherein the PVC toughening agent is prepared according to Examples 1-6 and Comparative Examples 1-5;

[0144] The rubber reinforcing agent is triethylamine and the lubricant is calcium stearate.

[0145] Performance Testing

[0146] The ACR toughening agent purchased on the market, the toughening agent prepared in Examples 1-6 and Comparative Examples 1-4 were used in PVC, the mass ratio of the toughening agent to PVC was 8:100, and the samples to be tested were obtained by extrusion molding. The impact strength of the obtained samples at 25°C and -10°C was tested respectively with reference to the test standard of GB / T9639.1-2008, and the ACR toughening agent was a commercially available PVC toughening agent. The results of the performance test are shown in Table 1.

[0147] Table 1 Performance test results of Examples 1-6 and Comparative Examples 1-5

[0148]

[0149] As can be seen from Table 1, the performance of the PVC toughening agent prepared in Example 2 is good, indicating that the prepared PVC toughening agent can quickly promote the gelation of PVC, so that the PVC material has better wear resistance and compressive strength, achieves the function of accelerating the plasticization of PVC, and improves the processing performance of PVC.

[0150] According to the results of performance tests, in the PVC tougheners prepared in Examples 1 to 6, after stearic acid reacts with graphene through a silane coupling agent, its solubility and dispersibility in organic solvents are significantly improved. Stearic acid and oleic acid are the most effective graphene modifiers, which can significantly improve the dispersibility of graphene in organic solvents.

[0151] The application of nano zinc oxide in nitrile rubber is mainly reflected in its modification. Through the surface coating modification method, the dispersibility and stability of nano zinc oxide in rubber can be improved. For example, the use of γ-aminopropyl triethoxysilane through the silane coupling agent KH550 for modification can significantly improve the dispersibility of nano zinc oxide in nitrile rubber, making the toughening effect of PVC toughening agent more stable during use, thereby improving the impact resistance of PVC and reducing the production cost of PVC products.

[0152] It should be noted that when the present invention involves a numerical range, it should be understood that the two endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods used are the same as those in the embodiments, in order to avoid redundancy, the present invention describes a preferred embodiment. Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the attached claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0153] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A PVC toughening agent, characterized in that: The PVC toughening agent comprises the following components by weight: 5-12 parts of ACR impact modifier, 25-50 parts of inorganic filler, 8-15 parts of chlorinated polyethylene, 12-33 parts of modified nitrile rubber, 7-16 parts of surface modified glass fiber, 4-10 parts of silicon carbide whisker; Wherein, the surface-modified glass fiber is obtained by modifying the surface of the glass fiber with graphene and a silane coupling agent; The inorganic filler is one or more of nano-TiO2, nano-SiC, and nano-Si3N4; The modified nitrile rubber consists of nano zinc oxide, dibutyl phthalate, stearic acid and nitrile rubber, and is prepared by mixing the nano zinc oxide, dibutyl phthalate and stearic acid to modify the nitrile rubber.

2. The PVC toughening agent according to claim 1, characterized in that: The PVC toughening agent comprises the following components by weight: 6-10 parts of ACR impact modifier, 35-45 parts of inorganic filler, 10-15 parts of chlorinated polyethylene, 19-30 parts of modified nitrile rubber, 8-15 parts of surface modified glass fiber, and 4-6 parts of silicon carbide whiskers.

3. The PVC toughening agent according to claim 1, characterized in that: In the surface-modified glass fiber, the mass ratio of graphene, silane coupling agent and glass fiber is 0.5-3:1-2:5-10.

4. The PVC toughening agent according to claim 1, characterized in that: The mass ratio of nano zinc oxide, dibutyl phthalate, stearic acid and nitrile rubber in the modified nitrile rubber is 1-2:0.5-1:2-3:3-4.

5. The PVC toughening agent according to claim 1, characterized in that: The average particle size of the silicon carbide whisker is 80 microns, the compressive strength is 100 MPa, and the density is 0.25 g / cm 3 .

6. The PVC toughening agent according to claim 1, characterized in that: The particle size of the inorganic filler is 1-50 nm.

7. A method for preparing the PVC toughening agent according to claim 1, characterized in that: The following steps are involved: Weigh the following raw materials in parts by weight: 5-12 parts of ACR impact modifier, 25-50 parts of inorganic filler, 8-15 parts of chlorinated polyethylene, 12-33 parts of modified nitrile rubber, 7-16 parts of surface modified glass fiber, and 4-10 parts of silicon carbide whisker; The modified nitrile rubber and the surface-modified glass fiber are uniformly mixed to obtain a copolymer; Dispersing silicon carbide whiskers, ACR impact modifier, inorganic filler and chlorinated polyethylene, and mixing them uniformly to obtain a mixture; The prepared mixed material is mixed with the copolymer and ground, and after being mixed evenly, a PVC toughening agent is prepared.

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