An environmentally friendly PVC automotive skin and its preparation method

Abstract

The present invention relates to the technical field of automotive interior decoration, and particularly relates to an environmentally friendly PVC automotive skin and a preparation method thereof; an environmentally friendly PVC automotive skin, the automotive skin comprising a skin layer, an adhesive film layer and a base fabric layer sequentially arranged from top to bottom; the skin layer comprises the following components in parts by weight: 1-50 parts of polypropylene, 1-50 parts of PVC resin, 1-50 parts of polyethylene glycol, 5-10 parts of wear-resistant agent and 1-6 parts of auxiliary agent; the wear-resistant agent comprises the following components in parts by weight: 1-5 parts of nano-silica, 30-60 parts of natural fiber, 1-3 parts of short carbon fiber, 5-10 parts of coupling agent, 20-45 parts of PVC resin, 1-5 parts of maleic anhydride grafted polyethylene and 1-2 parts of paraffin; the automotive skin prepared in this application has good wear resistance, good mechanical properties and interlayer adhesion, the interlayer is firmly combined, the bonding degree is good, and it is environmentally friendly and pollution-free during the processing and production process.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive interior decoration, and particularly to an environmentally friendly PVC automotive skin and a preparation method thereof. Background Art

[0002] With the continuous development of the automotive industry, while automobiles bring convenient lives to people, they also make the problems of energy crisis and climate environmental deterioration increasingly prominent. "Green sustainable development and reduction of carbon emissions" have become a global consensus, the general trend, and a systematic project, which requires starting from the overall situation, reasonable design, and systematic layout.

[0003] PVC skin is an environmentally friendly material, and has good recyclability, with little pollution to the environment, and has become the choice of many manufacturers. In order to improve the wear resistance of the PVC skin, during the production of the existing PVC skin, in addition to the basic resin, additives such as wear-resistant agents need to be added. However, the stability of the production additives is poor, and different degrees of degradation will occur after heating, releasing small molecule substances, with high volatility, causing air pollution in the vehicle. Therefore, how to improve the wear resistance of the PVC skin while taking into account the environmentally friendly PVC skin has become an urgent problem to be solved. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present application provides an environmentally friendly PVC automotive skin and a preparation method thereof.

[0005] In the first aspect, the present application provides an environmentally friendly PVC automotive skin, adopting the following technical scheme:

[0006] An environmentally friendly PVC automotive skin, the automotive skin includes a skin layer, a glue film layer, and a base cloth layer arranged in sequence from top to bottom;

[0007] The skin layer includes the following components in parts by weight: 1 - 50 parts of polypropylene, 1 - 50 parts of PVC resin, 1 - 50 parts of polyethylene glycol, 5 - 10 parts of wear-resistant agent, and 1 - 6 parts of additive;

[0008] The wear-resistant agent includes the following components in parts by weight: 1 - 5 parts of nano-silica, 30 - 60 parts of natural fiber, 1 - 3 parts of short carbon fiber, 5 - 10 parts of coupling agent, 20 - 45 parts of PVC resin, 1 - 5 parts of maleic anhydride grafted polyethylene, and 1 - 2 parts of paraffin.

[0009] In the present application, by improving the composition of the wear-resistant agent and adding natural fiber, natural fiber has the advantages of low cost and biodegradability, being green and environmentally friendly; the added natural fiber effectively improves the tensile strength, elongation at break, and wear resistance of the composite material. The added natural fiber is combined with the PVC resin under the action of the coupling agent, thereby greatly improving the wear resistance and mechanical properties of the skin layer.

[0010] In this application, by improving the composition of the wear-resistant agent and adding short carbon fiber, the short carbon fiber is used in combination with natural fiber, which can further improve the mechanical properties, tensile strength, fracture strength and wear resistance of the composite material; the added short carbon fiber combines with PVC resin under the action of a coupling agent, thus greatly improving the wear resistance and mechanical properties of the skin layer.

[0011] In this application, by improving the composition of the wear-resistant agent and adding nano-silica, the strength and wear resistance of the composite material are effectively improved. The added nano-silica combines with PVC resin under the action of a coupling agent, thus greatly improving the wear resistance and mechanical properties of the skin layer.

[0012] By adopting the above technical solution, the added nano-silica, natural fiber and short carbon fiber react with PVC resin under the action of a coupling agent, thereby preparing a wear-resistant agent with high wear resistance and mechanical properties.

[0013] Preferably, the natural fiber includes the following components by weight: 1-10 parts of wood fiber, 1-5 parts of bamboo fiber and 1-5 parts of ramie fiber.

[0014] Preferably, the natural fiber is pretreated as follows: the natural fiber is steam-heated at 150-210 °C for 10-30 minutes.

[0015] By adopting the above technical solution, since natural fiber is extremely easy to absorb moisture and the moisture content of plant fiber is too high, which greatly affects the dispersibility of wood fiber and also affects the performance of the composite material; in this application, by heat-treating the natural fiber, the content of free water and bound water in the plant fiber can be reduced, and the impurities adsorbed on the fiber surface can be removed to a certain extent, effectively improving the performance of the fiber, enhancing the dispersibility of the natural fiber, and greatly improving the performance of the natural fiber.

[0016] In this application, by heat-treating the natural fiber, the number of active hydroxyl groups on the fiber molecular chain is greatly reduced, which can effectively reduce the interfacial tension and improve the interfacial bonding strength, thereby improving the bonding strength between the natural fiber and PVC resin, obtaining a wear-resistant agent with wear resistance and certain interlayer adhesion, and making the prepared wear-resistant agent better mixed with other raw materials.

[0017] Preferably, the nano-silica is modified as follows: after the nano-silica is modified with a coupling agent, it is dried at 90-120 °C for 10-15 hours to obtain the modified nano-silica.

[0018] By adopting the above technical solution, nano-silica has the ability to improve the strength of the composite material, improve the resistance to moist heat aging, and resist ultraviolet aging. However, nano-silica has poor dispersibility and is prone to agglomeration. In this application, by modifying the nano-silica, the dispersion performance of the nano-silica is greatly improved, the agglomeration phenomenon is weakened, thereby improving the bonding strength between the nano-silica and the PVC resin, obtaining a wear-resistant agent with wear resistance and a certain interlayer adhesion, so that the prepared wear-resistant agent can be better mixed with other raw materials.

[0019] Preferably, the chopped carbon fibers are pretreated in the following steps: the chopped carbon fibers are oxidized at 500-560° C. for 1-2 hours.

[0020] By adopting the above technical solution, in this application, the chopped carbon fibers are pretreated, and after oxidation treatment, uneven grooves and protrusions are etched on the surface of the chopped carbon fibers, thereby increasing the specific surface area and surface roughness of the chopped carbon fibers, which is beneficial to improving the bonding strength between the chopped carbon fibers and the PVC resin, thereby obtaining a wear-resistant agent with wear resistance and a certain interlayer adhesion, so that the prepared wear-resistant agent can be better mixed with other raw materials.

[0021] Preferably, the preparation steps of the wear-resistant agent are as follows: natural fibers and chopped carbon fibers are mixed, PVC resin, maleic anhydride grafted polyethylene, and paraffin are added and mixed; nano-silica and a coupling agent are added and mixed to obtain the wear-resistant agent.

[0022] In this application, by improving the raw materials and through the synergistic effect of added nano-silica, short-cut carbon fibers and natural fibers, a wear-resistant agent with certain mechanical strength, wear resistance and mechanical properties is prepared, thereby making the prepared automobile surface performance better.

[0023] Preferably, the auxiliary agent is at least one of a flame retardant, an anti-aging agent, a leveling agent, a light stabilizer or an antioxidant.

[0024] Preferably, the flame retardant is at least one of an organophosphorus flame retardant, melamine or alumina;

[0025] The anti-aging agent is at least one of a benzophenone anti-aging agent, a benzotriazole anti-aging agent or a triazine anti-aging agent; the leveling agent is an organic silicon leveling agent;

[0026] The light stabilizer is at least one of light stabilizer UV-329, light stabilizer UV-234 or light stabilizer UV-531;

[0027] The antioxidant is at least one of antioxidant 1010, antioxidant 168, and antioxidant 1098.

[0028] Preferably, the film layer is a mixture of cellulose acetate butyrate and polypropylene, and the mass ratio of cellulose acetate butyrate to polypropylene is 1:(5-15).

[0029] In a second aspect, the present application provides a method for preparing an environmentally friendly PVC automotive skin, adopting the following technical solution:

[0030] A method for preparing an environmentally friendly PVC automotive skin, the steps are as follows:

[0031] Weigh each raw material according to the ratio;

[0032] Mix polypropylene, PVC resin, polyethylene glycol, wear-resistant agent and additives for 25-50 minutes to obtain a reaction material;

[0033] Coat the reaction material on the surface of the film layer, and then place the film layer on the surface of the base fabric layer to obtain the automotive skin.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] The automotive skin prepared by the present application has good wear resistance, and at the same time has good mechanical properties and interfacial adhesion. The interfacial combination is firm and the adhesion degree is good, which can effectively ensure the molding quality of the product; it is environmentally friendly and pollution-free during the processing and production process. Specific embodiments

[0036] The technical solutions of the present invention are further described below through specific embodiments. The specific embodiments do not represent a limitation on the protection scope of the present invention; some non-essential modifications and adjustments made by others based on the concept of the present invention still fall within the protection scope of the present invention.

[0037] The raw materials involved in the present application are all commercially available products,

[0038] Nano-silica, manufacturer: Nanjing Haitai Nano Materials Co., Ltd., specification: nominal particle size 20±5nm.

[0039] Short carbon fiber: 24K, length 6mm, moisture content <3%, Shenyang Zhongheng Composite Materials Co., Ltd.

[0040] Maleic anhydride grafted polyethylene: purchased from Macklin.

[0041] Cellulose acetate butyrate, polypropylene: purchased from Aladdin.

[0042] Polyvinyl chloride (PVC resin): purchased from Shanghai Yuanye Bio-Technology Co., Ltd., grade S51649-250g.

[0043] Leveling agent: silicone leveling agent, purchased from Tianjin Hepu Feile New Materials Co., Ltd., grade SIF-706A.

[0044] Polypropylene: Purchased from Shanghai Spectrum Vibration Biology.

[0045] Polyethylene glycol: Purchased from Merck.

[0046] Anti-aging agent: Benzophenone anti-aging agent, purchased from Qingdao Jiedejia New Material Technology Co., Ltd.

[0047] Wood fiber: Purchased from Huimin County Taili Chemical Fiber Products Co., Ltd.

[0048] Bamboo fiber: Purchased from Changzhou Rongao Chemical New Materials Co., Ltd., product number RA-600.

[0049] Ramie fiber: Purchased from Linyi Yuanma Arts and Crafts Co., Ltd., fiber length ≥ 130, impurity content ≤ 1.0, moisture regain is 16.28, fiber strength ≥ 255.

[0050] The present application will be further described in detail below in conjunction with examples and comparative examples.

[0051] Example 1:

[0052] An environmentally friendly PVC automotive skin, the automotive skin includes a skin layer, a film layer, and a base fabric layer arranged in sequence from top to bottom;

[0053] (1) Preparation of wear-resistant agent:

[0054] Mix 50 kg of natural fiber and 2 kg of short-cut carbon fiber for 10 minutes at a rotation speed of 500 rpm, add 35 kg of PVC resin, 3 kg of maleic anhydride grafted polyethylene, and 1.5 kg of paraffin for mixing for 20 minutes, and then add 2.5 kg of nano-silica and 7 kg of coupling agent KH-550, and stir at 160 °C and a rotation speed of 1200 rpm for 15 minutes to obtain a wear-resistant agent.

[0055] Among them, the natural fiber includes the following components: 5 kg of wood fiber, 3 kg of bamboo fiber, and 3 kg of ramie fiber.

[0056] (2) Preparation of the film layer:

[0057] Mix 1 kg of cellulose acetate butyrate and 10 kg of polypropylene for 15 minutes to obtain a film layer.

[0058] (3) Preparation of the automotive skin:

[0059] Disperse and stir 25 kg of polypropylene, 25 kg of PVC resin, 25 kg of polyethylene glycol, 8 kg of wear-resistant agent, and 3 kg of auxiliary agent for 30 minutes at a rotation speed of 2000 rpm to obtain a reaction material;

[0060] Coat the reaction materials on the surface of the film layer, then place the film layer on the surface of the base fabric layer, and roll press at 0.3 MPa to obtain the automotive skin.

[0061] The auxiliary agent is a mixture of a flame retardant, an anti-aging agent, a leveling agent, a light stabilizer, and an antioxidant, and the mass ratio is 1:1:1:1:1.

[0062] The flame retardant is alumina;

[0063] The anti-aging agent is a benzophenone-based anti-aging agent;

[0064] The leveling agent is a silicone-based leveling agent;

[0065] The light stabilizer is light stabilizer UV-329;

[0066] The antioxidant is antioxidant 168.

[0067] Example 2:

[0068] An environmentally friendly PVC automotive skin, which includes a skin layer, a film layer, and a base fabric layer arranged in sequence from top to bottom;

[0069] (1) Preparation of the wear-resistant agent:

[0070] Mix 30 kg of natural fiber and 1 kg of short-cut carbon fiber for 10 min at a rotation speed of 500 rpm, add 20 kg of PVC resin, 1 kg of maleic anhydride grafted polyethylene, and 1 kg of paraffin, mix for 20 minutes, then add 1 kg of nano-silica and 5 kg of coupling agent KH-550, and stir at 160 °C and a rotation speed of 1200 rpm for 15 minutes to obtain the wear-resistant agent.

[0071] Among them, the natural fiber includes the following components: 1 kg of wood fiber, 1 kg of bamboo fiber, and 1 kg of ramie fiber.

[0072] (2) Preparation of the film layer:

[0073] Mix 1 kg of cellulose acetate butyrate and 5 kg of polypropylene for 15 minutes to obtain the film layer.

[0074] (3) Preparation of the automotive skin:

[0075] Disperse and stir 1 kg of polypropylene, 1 kg of PVC resin, 1 kg of polyethylene glycol, 5 kg of wear-resistant agent, and 1 kg of auxiliary agent at a rotation speed of 2000 rpm for 30 minutes to obtain the reaction materials;

[0076] Coat the reaction materials on the surface of the film layer, then place the film layer on the surface of the base fabric layer, and roll press at 0.3 MPa to obtain the automotive skin.

[0077] The auxiliary agent is a mixture of a flame retardant, an anti-aging agent, a leveling agent, a light stabilizer and an antioxidant, and the mass ratio is 1:1:1:1:1.

[0078] The flame retardant is alumina;

[0079] The anti-aging agent is a benzophenone anti-aging agent;

[0080] The leveling agent is a silicone leveling agent;

[0081] The light stabilizer is light stabilizer UV-329;

[0082] The antioxidant is antioxidant 168.

[0083] Example 3:

[0084] An environmentally friendly PVC automotive skin, which includes a skin layer, a film layer and a base fabric layer arranged in sequence from top to bottom;

[0085] (1) Preparation of wear-resistant agent:

[0086] Mix 60 kg of natural fiber and 3 kg of chopped carbon fiber for 10 min at a rotation speed of 500 rpm, add 45 kg of PVC resin, 5 kg of maleic anhydride grafted polyethylene, and 2 kg of paraffin wax and mix for 20 minutes, then add 5 kg of nano-silica and 10 kg of coupling agent KH-550, and stir at 160 °C and a rotation speed of 1200 rpm for 15 minutes to obtain the wear-resistant agent.

[0087] Among them, the natural fiber includes the following components: 10 kg of wood fiber, 5 kg of bamboo fiber and 5 kg of ramie fiber.

[0088] (2) Preparation of the film layer:

[0089] Mix 1 kg of cellulose acetate butyrate and 15 kg of polypropylene for 15 minutes to obtain the film layer.

[0090] (3) Preparation of the automotive skin:

[0091] Disperse and stir 50 kg of polypropylene, 50 kg of PVC resin, 50 kg of polyethylene glycol, 10 kg of wear-resistant agent, and 6 kg of auxiliary agent at a rotation speed of 2000 rpm for 30 minutes to obtain the reaction material;

[0092] Coat the reaction material on the surface of the film layer, then place the film layer on the surface of the base fabric layer, and roll press at 0.3 MPa to obtain the automotive skin.

[0093] The auxiliary agent is a mixture of a flame retardant, an anti-aging agent, a leveling agent, a light stabilizer, and an antioxidant, and the mass ratio is 1:1:1:1:1.

[0094] The flame retardant is alumina;

[0095] The anti-aging agent is a benzophenone-based anti-aging agent;

[0096] The leveling agent is a silicone-based leveling agent;

[0097] The light stabilizer is light stabilizer UV-329;

[0098] The antioxidant is antioxidant 168.

[0099] Example 4:

[0100] The difference from Example 1 is that the natural fiber is a pretreated natural fiber.

[0101] The pretreatment of the natural fiber is carried out as follows:

[0102] 100 kg of natural fiber is subjected to steam heating treatment at 180 °C for 25 minutes.

[0103] Example 5:

[0104] The difference from Example 1 is that the natural fiber is a pretreated natural fiber.

[0105] The pretreatment of the natural fiber is carried out as follows:

[0106] 100 kg of natural fiber is subjected to steam heating treatment at 150 °C for 10 minutes.

[0107] Example 6:

[0108] The difference from Example 1 is that the natural fiber is a pretreated natural fiber.

[0109] The pretreatment of the natural fiber is carried out as follows:

[0110] 100 kg of natural fiber is subjected to steam heating treatment at 210 °C for 30 minutes.

[0111] Example 7:

[0112] The difference from Example 1 is that the nano-silica is modified nano-silica.

[0113] The modification treatment of the nano-silica is carried out as follows:

[0114] (1) After placing the nano-silica powder in an oven at 100 °C for constant-temperature drying for 12 hours, anhydrous ethanol was added and stirred evenly to obtain a suspension containing nano-silica;

[0115] (2) The coupling agent KH-550, anhydrous ethanol, and deionized water were mixed to obtain a mixed solution of the coupling agent KH-550. Among them, the mass of the coupling agent KH-550 was 3% of the mass of the nano-silica powder;

[0116] (3) The suspension containing nano-silica and the mixed solution of the coupling agent KH-550 were mixed at a volume ratio of 1:1, reacted at 80 °C for 30 minutes, filtered, dried, ground, and then dried at 100 °C for 13 hours to obtain modified nano-silica.

[0117] Example 8:

[0118] The difference from Example 1 is that the nano-silica is the modified nano-silica.

[0119] The modification process of the nano-silica is as follows:

[0120] (1) After placing the nano-silica powder in an oven at 100 °C for constant-temperature drying for 12 hours, anhydrous ethanol was added and stirred evenly to obtain a suspension containing nano-silica;

[0121] (2) The coupling agent KH-550, anhydrous ethanol, and deionized water were mixed to obtain a mixed solution of the coupling agent KH-550. Among them, the mass of the coupling agent KH-550 was 3% of the mass of the nano-silica powder;

[0122] (3) The suspension containing nano-silica and the mixed solution of the coupling agent KH-550 were mixed at a volume ratio of 1:1, reacted at 80 °C for 30 minutes, filtered, dried, ground, and then dried at 90 °C for 10 hours to obtain modified nano-silica.

[0123] Example 9:

[0124] The difference from Example 1 is that the nano-silica is the modified nano-silica.

[0125] The modification process of the nano-silica is as follows:

[0126] (1) After placing the nano-silica powder in an oven at 100 °C for constant-temperature drying for 12 hours, anhydrous ethanol was added and stirred evenly to obtain a suspension containing nano-silica;

[0127] (2) Mix coupling agent KH-550, absolute ethanol, and deionized water to obtain a mixed solution of coupling agent KH-550, where the mass of coupling agent KH-550 is 3% of the mass of nano-silica powder.

[0128] (3) Mix the suspension containing nano-silica and the mixed solution of coupling agent KH-550 in a volume ratio of 1:1, react at 80 °C for 30 minutes, perform suction filtration, drying, and grinding, and then conduct drying treatment at 120 °C for 15 hours to obtain modified nano-silica.

[0129] Example 10:

[0130] The difference from Example 1 is that the short carbon fiber is pre-treated short carbon fiber.

[0131] Pre-treat the short carbon fiber as follows: Put 20 kg of short carbon fiber into a VF-1200D8 muffle furnace, introduce air, and perform oxidation treatment at 550 °C for 1.5 hours.

[0132] Example 11:

[0133] The difference from Example 1 is that the short carbon fiber is pre-treated short carbon fiber.

[0134] Pre-treat the short carbon fiber as follows: Put 20 kg of short carbon fiber into a VF-1200D8 muffle furnace, introduce air, and perform oxidation treatment at 500 °C for 1 hour.

[0135] Example 12:

[0136] The difference from Example 1 is that the short carbon fiber is pre-treated short carbon fiber.

[0137] Pre-treat the short carbon fiber as follows: Put 20 kg of short carbon fiber into a VF-1200D8 muffle furnace, introduce air, and perform oxidation treatment at 560 °C for 2 hours.

[0138] Example 13:

[0139] The difference from Example 1 is that the natural fiber is pre-treated natural fiber, and the nano-silica is modified nano-silica.

[0140] Pre-treat the natural fiber as follows:

[0141] Steam heat 100 kg of natural fiber at 180 °C for 25 minutes.

[0142] Modify the nano-silica as follows:

[0143] (1) After placing the nano-silica powder in an oven at 100 °C for constant-temperature drying for 12 hours, anhydrous ethanol was added and stirred evenly to obtain a suspension containing nano-silica;

[0144] (2) The coupling agent KH-550, anhydrous ethanol, and deionized water were mixed to obtain a mixed solution of the coupling agent KH-550. Among them, the mass of the coupling agent KH-550 was 3% of the mass of the nano-silica powder;

[0145] (3) The suspension containing nano-silica and the mixed solution of the coupling agent KH-550 were mixed at a volume ratio of 1:1, reacted at 80 °C for 30 minutes, filtered, dried, and ground, and then dried at 100 °C for 13 hours to obtain modified nano-silica.

[0146] Example 14:

[0147] The difference from Example 1 is that the natural fiber is pre-treated natural fiber, and the short carbon fiber is pre-treated short carbon fiber.

[0148] The pre-treatment of the natural fiber was carried out as follows: 100 kg of natural fiber was steam-heated at 180 °C for 25 minutes.

[0149] The pre-treatment of the short carbon fiber was carried out as follows: 20 kg of short carbon fiber was placed in a VF-1200D8 muffle furnace, air was introduced, and it was oxidized at 550 °C for 1.5 hours.

[0150] Example 15:

[0151] The difference from Example 1 is that the natural fiber is pre-treated natural fiber, the nano-silica is modified nano-silica, and the short carbon fiber is pre-treated short carbon fiber.

[0152] The pre-treatment of the natural fiber was carried out as follows:

[0153] 100 kg of natural fiber was steam-heated at 180 °C for 25 minutes.

[0154] The modification treatment of the nano-silica was carried out as follows:

[0155] (1) After placing the nano-silica powder in an oven at 100 °C for constant-temperature drying for 12 hours, anhydrous ethanol was added and stirred evenly to obtain a suspension containing nano-silica;

[0156] (2) The coupling agent KH-550, anhydrous ethanol, and deionized water were mixed to obtain a mixed solution of the coupling agent KH-550. Among them, the mass of the coupling agent KH-550 was 3% of the mass of the nano-silica powder;

[0157] (3) Mix the suspension containing nano-silica and the mixed solution of coupling agent KH-550 in a volume ratio of 1:1, react at 80 °C for 30 minutes, perform suction filtration, drying, and grinding, and then conduct drying treatment at 100 °C for 13 hours to obtain modified nano-silica.

[0158] Pretreat the short carbon fiber as follows: Put 20 kg of short carbon fiber into the VF-1200D8 muffle furnace, introduce air, and perform oxidation treatment at 550 °C for 1.5 hours.

[0159] Comparative Example 1:

[0160] The difference from Example 1 is that no nano-silica is added.

[0161] Comparative Example 2:

[0162] The difference from Example 1 is that no natural fiber is added.

[0163] Comparative Example 3:

[0164] The difference from Example 1 is that no short carbon fiber is added.

[0165] Comparative Example 4:

[0166] The difference from Example 15 is that no nano-silica is added.

[0167] Comparative Example 5:

[0168] The difference from Example 15 is that no natural fiber is added.

[0169] Comparative Example 6:

[0170] The difference from Example 15 is that no short carbon fiber is added.

[0171] Comparative Example 7:

[0172] The difference from Example 1 is that no coupling agent is added.

[0173] Performance detection:

[0174] Test the interlayer adhesion, wear resistance, tensile strength, and elongation at break of the automotive skin prepared in Examples 1-15 and Comparative Examples 1-7. The test results are as follows:

[0175] 1. Tensile strength: Detect according to the standard of "GB / T 1040-2006 - Determination of tensile properties of plastics".

[0176] 2. Elongation at break: Detect according to the standard of "QB / T 1130-1991 Test method for right-angle tear properties of plastics".

[0177] 3. RCA Abrasion Test: Referring to the standard of 《ASTM F2357-04》, a Taber abrasion tester is used to detect the RCA abrasion resistance times of the automotive skin.

[0178] 4. Interlayer Adhesion: The detection is carried out referring to the standard of 《ISO 130-1997 Determination of Apparent Interlayer Shear Strength of Fiber Reinforced Plastic Composites by Short Specimen Method》.

[0179] Table 1 Performance Test Results

[0180]

[0181]

[0182] Combined with Table 1, it can be seen that for the automotive skin prepared in this application, the tensile strength is 41-61 MPa, the elongation at break is 447-497%, and the RCA abrasion resistance times is 5250-5871 times, indicating that the automotive skin has good abrasion resistance and good mechanical properties at the same time; for the automotive skin prepared in this application, the interlayer adhesion is 5.1-10.9 N / mm, indicating that the interlayer of the automotive skin is firmly bonded and has a good bonding degree, which can effectively ensure the molding quality of the product; the automotive skin prepared in this application has the advantages of both environmental protection and abrasion resistance.

[0183] Combined with Example 1 and Examples 4-6, it can be seen that the performance of Example 1 is lower than that of Examples 4-6, indicating that by pretreating natural fibers, it is beneficial to improve the bonding strength between natural fibers and PVC resin, obtain an abrasion-resistant agent with abrasion resistance and a certain interlayer adhesion, make the prepared abrasion-resistant agent better mixed with other raw materials, and thus make the performance of the prepared automotive skin better.

[0184] Combined with Example 1 and Examples 7-9, it can be seen that the performance of Example 1 is lower than that of Examples 7-9, indicating that by modifying nano-silica, it is beneficial to improve the bonding strength between nano-silica and PVC resin, obtain an abrasion-resistant agent with abrasion resistance and a certain interlayer adhesion, make the prepared abrasion-resistant agent better mixed with other raw materials, and thus make the performance of the prepared automotive skin better.

[0185] Combined with Example 1 and Examples 10-12, it can be seen that the performance of Example 1 is lower than that of Examples 10-12, indicating that by pretreating chopped carbon fibers, it is beneficial to improve the bonding strength between chopped carbon fibers and PVC resin, obtain an abrasion-resistant agent with abrasion resistance and a certain interlayer adhesion, make the prepared abrasion-resistant agent better mixed with other raw materials, and thus make the performance of the prepared automotive skin better.

[0186] Combined with Example 1, Example 4, Example 7, Example 10, Example 13 - Example 15, it can be seen that the performance of Example 15 is the best, indicating that in this application, by pre - treating natural fibers, modifying nano - silica, pre - treating short - cut carbon fibers, and through the cooperation of the pre - treated natural fibers, modified nano - silica, and pre - treated short - cut carbon fibers, with their synergistic effect, the performance of the prepared automotive skin is better.

[0187] Combined with Example 1 and Comparative Example 1, it can be seen that the performance of Example 1 is better than that of Comparative Example 1, indicating that the addition of nano - silica greatly improves the wear resistance of the automotive skin, making the performance of the prepared automotive skin better.

[0188] Combined with Example 1 and Comparative Example 2, it can be seen that the performance of Example 1 is better than that of Comparative Example 2, indicating that the addition of natural fibers greatly improves the wear resistance of the automotive skin, making the performance of the prepared automotive skin better.

[0189] Combined with Example 1 and Comparative Example 3, it can be seen that the performance of Example 1 is better than that of Comparative Example 3, indicating that the addition of short - cut carbon fibers greatly improves the wear resistance of the automotive skin, making the performance of the prepared automotive skin better.

[0190] Combined with Example 15 and Comparative Example 4, it can be seen that the performance of Example 15 is better than that of Comparative Example 4, indicating that the addition of nano - silica greatly improves the wear resistance of the automotive skin, making the performance of the prepared automotive skin better.

[0191] Combined with Example 15 and Comparative Example 5, it can be seen that the performance of Example 15 is better than that of Comparative Example 5, indicating that the addition of natural fibers greatly improves the wear resistance of the automotive skin, making the performance of the prepared automotive skin better.

[0192] Combined with Example 15 and Comparative Example 6, it can be seen that the performance of Example 15 is better than that of Comparative Example 6, indicating that the addition of short - cut carbon fibers greatly improves the wear resistance of the automotive skin, making the performance of the prepared automotive skin better.

[0193] Combined with Example 1 and Comparative Example 7, it can be seen that the performance of Example 1 is better than that of Comparative Example 7, indicating that the added nano - silica, natural fibers, and short - cut carbon fibers react with PVC resin under the action of a coupling agent, thereby preparing a wear - resistant agent with high wear resistance and mechanical properties.

Claims

1. An environmentally friendly PVC car skin, characterized by: The automobile skin comprises a skin layer, a film layer and a base fabric layer arranged in sequence from top to bottom; The skin layer comprises the following components in parts by weight: 1-50 parts of polypropylene, 1-50 parts of PVC resin, 1-50 parts of polyethylene glycol, 5-10 parts of wear-resistant agent and 1-6 parts of auxiliary agent; The wear-resistant agent comprises the following components in parts by weight: 1-5 parts of modified nano-silica, 30-60 parts of natural fiber, 1-3 parts of chopped carbon fiber, 5-10 parts of coupling agent, 20-45 parts of PVC resin, 1-5 parts of maleic anhydride grafted polyethylene and 1-2 parts of paraffin wax; The natural fibers include the following components by weight: 1-10 parts of wood fiber, 1-5 parts of bamboo fiber, and 1-5 parts of ramie fiber; The natural fiber is pretreated in the following steps: the natural fiber is steam-heated at 150-210° C. for 10-30 minutes; The preparation method of the modified nano-silica comprises the following steps: modifying the nano-silica with a coupling agent, and drying the nano-silica at 90-120° C. for 10-15 hours to obtain the modified nano-silica; The chopped carbon fibers are pretreated as follows: the chopped carbon fibers are oxidized at 500-560° C. for 1-2 hours; The preparation steps of the wear-resistant agent are as follows: natural fiber and chopped carbon fiber are mixed, PVC resin, maleic anhydride grafted polyethylene and paraffin are added and mixed, and then modified nano-silica and a coupling agent are added and mixed to obtain the wear-resistant agent.

2. The environmentally friendly PVC automobile surface according to claim 1, characterized in that: The auxiliary agent is at least one of a flame retardant, an anti-aging agent, a leveling agent, a light stabilizer or an antioxidant.

3. The environmentally friendly PVC automobile surface according to claim 2, characterized in that: The flame retardant is at least one of an organophosphorus flame retardant, melamine or alumina; The anti-aging agent is at least one of a benzophenone anti-aging agent, a benzotriazole anti-aging agent or a triazine anti-aging agent; The leveling agent is an organosilicon leveling agent; The light stabilizer is at least one of light stabilizer UV-329, light stabilizer UV-234 or light stabilizer UV-531; The antioxidant is at least one of antioxidant 1010, antioxidant 168, and antioxidant 1098.

4. The environmentally friendly PVC automobile surface according to claim 1, characterized in that: The adhesive film layer is a mixture of cellulose acetate butyrate and polypropylene, and the mass ratio of the cellulose acetate butyrate to the polypropylene is 1:(5-15).

5. A method for preparing the environmentally friendly PVC automobile surface skin according to any one of claims 1 to 4, characterized in that: Here are the steps: Weigh each raw material according to the ratio; Mixing polypropylene, PVC resin, polyethylene glycol, anti-wear agent and additives for 25-50 minutes to obtain a reaction mass; The reaction material is coated on the surface of the adhesive film layer, and then the adhesive film layer is arranged on the surface of the base fabric layer to obtain the automobile skin.

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