Vehicle low-temperature curing PVC plastisol composition and preparation method thereof

Abstract

The invention discloses a low-temperature curing PVC plastisol composition for a vehicle and a preparation method of the low-temperature curing PVC plastisol composition. The invention relates to a low-temperature curing PVC plastisol composition for vehicles, which is prepared from the following raw materials in parts by weight. Comprising 5 to 15 parts of polyvinyl chloride-vinyl acetate copolymer resin, 5 to 15 parts of homopolymerized PVC paste resin, 1 to 10 parts of blended PVC paste resin, 30 to 40 parts of a compound plasticizer, 1 to 10 parts of a hydrocarbon solvent, 0.5 to 1.5 parts of terminated polyurethane, 0.5 to 2 parts of polyamide, 0.5 to 1 part of a thixotropic agent, 30 to 45 parts of an inorganic filler, 1 to 5 parts of a stabilizer and 1 to 5 parts of a moisture absorbent. The compound plasticizer is prepared from diethylene glycol dibenzoate, isodecyl benzoate and diisononyl phthalate. The PVC plastisol composition disclosed by the invention is a low-temperature and short-time curing material, and can be cured under the conditions that the baking temperature is 125 DEG C and the baking time is 20 minutes.

Description

Technical Field

[0001] The present invention relates to the technical field of sealants, and particularly to a vehicle-use low-temperature curing PVC plastisol composition and a preparation method thereof. Background Art

[0002] At present, China's automobile industry is in a period of rapid development, and the types of vehicles such as off-road vehicles, station wagons, and electric vehicles are constantly enriching. With the continuous upgrading of people's consumption concepts and environmental protection awareness, higher requirements have been put forward for the whole vehicle manufacturing industry. Beautiful and comfortable, green and pollution-free, and solid and durable have become important criteria for people to buy cars. However, in order to extend the service life of automobiles, during the production process of automobiles, it is necessary to seal the weld positions such as the four doors and two covers with plastisol to achieve the purpose of anti-corrosion and noise reduction of the whole vehicle. At present, the vehicle-use plastisols are all baking-curing types, and the baking conditions are not lower than 140 °C for 30 min, which causes a large amount of energy consumption in the production of the whole vehicle and is accompanied by a large amount of VOC emissions. At present, the main means to solve such problems is to reduce the number of baking times of the whole vehicle and adopt the wet-on-wet baking process, but the baking temperature has not been reduced, and a large amount of energy is still consumed and accompanied by VOC emissions, which has an adverse impact on the environment. At present, the most widely used materials in China's whole vehicle manufacturing industry are PVC plastisols of different models. Such materials are low in price, convenient to use, and have good compatibility with electrophoresis and intermediate coating. However, the baking conditions are not lower than 140 °C for 30 min, and a large amount of energy is consumed and accompanied by a large amount of VOC emissions during the baking process, which does not meet the current global requirements for energy conservation and emission reduction.

[0003] Therefore, there is an urgent need for a vehicle-use low-temperature curing PVC plastisol composition and a preparation method thereof to solve the deficiencies existing in the prior art. Summary of the Invention

[0004] In view of the above problems, the purpose of the present invention is to provide a vehicle-use low-temperature curing PVC plastisol composition and a preparation method thereof. The PVC plastisol composition of the present invention is a low-temperature and short-time curing material, and can be cured at a minimum baking temperature of 125 °C and a baking time of 20 min.

[0005] To achieve the above purpose, on the one hand, the present invention provides a vehicle-use low-temperature curing PVC plastisol composition. Calculated by weight parts, the preparation raw materials include 5 parts to 15 parts of polyvinyl chloride-vinyl acetate copolymer resin, 5 parts to 15 parts of homopolymer PVC paste resin, 1 part to 10 parts of blended PVC paste resin, 30 parts to 40 parts of compound plasticizer, 1 part to 10 parts of straight-chain alkane, 0.5 part to 1.5 parts of blocked polyurethane, 0.5 part to 2 parts of polyamide, 0.5 part to 1 part of thixotropic agent, 30 parts to 45 parts of inorganic filler, 1 part to 5 parts of stabilizer, and 1 part to 5 parts of moisture absorbent. The compound plasticizer includes diethylene glycol dibenzoate, isodecyl benzoate, and diisononyl phthalate.

[0006] Compared with the prior art, the PVC plastisol composition of the present invention includes a low-temperature plasticizing PVC paste resin system composed of polyvinyl chloride-vinyl acetate copolymer resin, homopolymerized PVC paste resin, and blended PVC paste resin. In this system, raw materials such as compound plasticizer, blocked polyurethane, and polyamide are added. Among them, the compound plasticizer includes diethylene glycol dibenzoate, isodecyl benzoate, and diisononyl phthalate. Diethylene glycol dibenzoate can effectively reduce the plasticizing temperature of the PVC paste resin system and improve the tensile strength, elongation at break, and shear strength after curing of the composition system. Isodecyl benzoate can reduce the plasticizing temperature of the PVC paste resin and improve the storage stability of the composition. Diisononyl phthalate is environmentally friendly and can thus reduce the impact of the composition system on the environment. Therefore, the combined use of the aforementioned compound plasticizer can effectively reduce the plasticizing temperature of the PVC paste resin system while reducing the environmental impact and improving the mechanical strength, enabling it to be cured under the conditions of 125°C and 20 minutes at the lowest. Due to the low baking temperature and short time, the composition system of the present invention also has excellent yellowing resistance. The combined use of blocked polyurethane and polyamide can effectively improve the adhesion of the composition system to the substrate after curing into a film, and at the same time has excellent compatibility with the primer surfacer and topcoat, can meet the B1B2, 3C2B, and 3C1B processes, reduce the number of vehicle baking times, and reduce VOC emissions while reducing energy consumption.

[0007] As a preferred technical solution, the weight ratio of diethylene glycol dibenzoate, isodecyl benzoate, and diisononyl phthalate in the present invention is 1-2:1-2:2-6.

[0008] As a preferred technical solution, the content of vinyl acetate in the polyvinyl chloride-vinyl acetate copolymer resin of the present invention is 6%-10%. As an example, the content of vinyl acetate in the polyvinyl chloride-vinyl acetate copolymer resin of the present invention can be, but is not limited to, 6%, 7%, 8%, 9%, 10%.

[0009] As a preferred technical solution, the polyvinyl chloride-vinyl acetate copolymer resin of the present invention is selected from at least one of Arkema LACOVYL PA 1384 from France, Shenyang Chemical Industry PCMA-12 in China, and PR640 of Formosa Plastics Corporation, Ltd. in Taiwan, China. The polyvinyl chloride-vinyl acetate copolymer resin of the present invention has the characteristics of low plasticizing temperature and high strength.

[0010] As a preferred technical solution, the homopolymerized PVC paste resin of the present invention is selected from at least one of Siamvic 370HD from Thailand and Shenyang Chemical Industry PSM-31 in China. The homopolymerized PVC paste resin of the present invention has stable storage and excellent sulfur sag resistance.

[0011] As a preferred technical solution, the blended PVC paste resin of the present invention is selected from at least one of German Vinnolit SA1062 / 7 and German Vinnolit C66W. The blended resin of the present invention has a low plasticization temperature, good weather resistance, and is easy to spray.

[0012] As a preferred technical solution, the diethylene glycol dibenzoate is selected from FLEX 314 of Wuhan Yikede Fine Chemical Co., Ltd., the isodecyl benzoate is selected from ExxonMobil Jayflex MB10, and the diisononyl phthalate is selected from Formosa Plastics DINP, but not limited thereto.

[0013] As a preferred technical solution, the thixotropic agent of the present invention is selected from at least one of fumed silica and fumed silicon dioxide. As an example, the thixotropic agent can be selected from Cabot's M-5 and K200.

[0014] As a preferred technical solution, the inorganic filler of the present invention includes at least one of carbonate and modified carbonate. Specifically, the carbonate can be selected from at least one of calcium carbonate and magnesium carbonate, but not limited thereto. The modified carbonate can be calcium carbonate coated with stearic acid, but not limited thereto. As an example, the inorganic filler of the present invention can be selected from at least one of WN502, XTCC201, Omyacarb8-IK, and four-fly powder.

[0015] As a preferred technical solution, the stabilizer of the present invention includes at least one of zinc oxide and magnesium oxide.

[0016] As a preferred technical solution, the moisture absorbent of the present invention includes at least one of calcium oxide and molecular sieve.

[0017] As a preferred technical solution, the hydrocarbon solvent of the present invention is selected from at least one of D60 and D80.

[0018] On the other hand, the present invention provides a method for preparing a vehicle-use low-temperature curing PVC plastisol composition, including the steps of: (1) According to the raw material ratio, add the compound plasticizer to the stirring kettle, and while stirring, add the linear alkane, end-capped polyurethane, polyamide, thixotropic agent, stabilizer, and moisture absorbent, and mix evenly to obtain the first mixture; (2) Start high-speed stirring, and sequentially add the inorganic filler, polyvinyl chloride-vinyl acetate copolymer resin, homopolymer PVC paste resin, and blended PVC paste resin to the first mixture, control the stirring temperature to 35°C and below, and mix evenly to obtain the second mixture; (3) Cure, degas, filter, and fill the second mixture.

[0019] As a preferred technical solution, the curing temperature is 15°C to 30°C, and the curing time is 12h to 24h.

[0020] As a preferred technical solution, the degassing may specifically be vacuum degassing.

[0021] As a preferred technical solution, the mesh number of the filtration is 60 meshes. Specific embodiments

[0022] To better illustrate the purpose, technical solution and beneficial effects of the present invention, the present invention will be further described below in conjunction with specific embodiments. It should be noted that the following described method of the embodiment is a further explanatory description of the present invention and should not be construed as a limitation of the present invention.

[0023] For the description of the sources of the main materials in the examples and comparative examples, please refer to Table 1. The remaining raw materials not described in Table 1 are obtained from ordinary commercial sources.

[0024] Table 1 Sources of materials in examples and comparative examples

[0025] Example 1 This example provides a vehicle-use low-temperature curing PVC plastisol composition. Calculated by weight parts, the preparation raw materials include 12 parts of polyvinyl chloride-vinyl acetate copolymer resin A, 6 parts of homopolymer PVC paste resin A, 2 parts of blended PVC paste resin, 33 parts of compound plasticizer, 3.5 parts of hydrocarbon solvent, 0.6 part of blocked polyurethane, 1.4 parts of polyamide, 0.5 part of thixotropic agent, 35 parts of inorganic filler, 2 parts of stabilizer, and 4 parts of moisture absorbent. The compound plasticizer includes 5.5 parts of diethylene glycol dibenzoate, 5.5 parts of isodecyl benzoate, and 22 parts of diisononyl phthalate. Among them, the thixotropic agent is fumed silica, the inorganic filler is calcium carbonate, the stabilizer is zinc oxide, the moisture absorbent is calcium oxide, and the hydrocarbon solvent is D60.

[0026] The preparation method of the vehicle-use low-temperature curing PVC plastisol composition in this example includes the steps of: (1) According to the raw material ratio, add the compound plasticizer to the stirring kettle, and while stirring, add the hydrocarbon solvent, blocked polyurethane, polyamide, thixotropic agent, stabilizer and moisture absorbent, and mix evenly to obtain a first mixture; (2) Start high-speed stirring, and sequentially add the inorganic filler, polyvinyl chloride-vinyl acetate copolymer resin A, homopolymer PVC paste resin A, and blended PVC paste resin to the first mixture, and control the stirring temperature to be 35 °C or below, and mix evenly to obtain a second mixture; (3) Carry out 16 h of curing, vacuum degassing, and filtration through a 60-mesh filter bag on the second mixture, and then fill it to obtain the vehicle-use low-temperature curing PVC plastisol composition.

[0027] When the vehicle-use low-temperature curing PVC plastisol composition of this embodiment is in use, it only needs to be adjusted with a compound plasticizer, a hydrocarbon solvent, and an inorganic filler according to the requirements of viscosity, solid content, and density under actual working conditions.

[0028] Example 2 This embodiment provides a vehicle-use low-temperature curing PVC plastisol composition. Calculated by weight parts, the preparation raw materials include 12 parts of polyvinyl chloride-vinyl acetate copolymer resin A, 6 parts of homopolymer PVC paste resin B, 4 parts of blended PVC paste resin, 32 parts of compound plasticizer, 6.5 parts of hydrocarbon solvent, 1 part of blocked polyurethane, 2 parts of polyamide, 0.5 part of thixotropic agent, 30 parts of inorganic filler, 2 parts of stabilizer, 4 parts of moisture absorbent. The compound plasticizer includes 5.3 parts of diethylene glycol dibenzoate, 5.3 parts of isodecyl benzoate, and 21.4 parts of diisononyl phthalate. Among them, the thixotropic agent is fumed silica, the inorganic filler is calcium carbonate, the stabilizer is zinc oxide, the moisture absorbent is calcium oxide, and the hydrocarbon solvent is D60.

[0029] The vehicle-use low-temperature curing PVC plastisol composition of this embodiment can be prepared with reference to the preparation method of Example 1.

[0030] When the vehicle-use low-temperature curing PVC plastisol composition of this embodiment is in use, it only needs to be adjusted with a compound plasticizer, a hydrocarbon solvent, and an inorganic filler according to the requirements of viscosity, solid content, and density under actual working conditions.

[0031] Example 3 This embodiment provides a vehicle-use low-temperature curing PVC plastisol composition. Calculated by weight parts, the preparation raw materials include 11 parts of polyvinyl chloride-vinyl acetate copolymer resin B, 6 parts of homopolymer PVC paste resin A, 6 parts of blended PVC paste resin, 30 parts of compound plasticizer, 8 parts of hydrocarbon solvent, 0.7 part of blocked polyurethane, 1.6 parts of polyamide, 0.7 part of thixotropic agent, 32 parts of inorganic filler, 1 part of stabilizer, 3 parts of moisture absorbent. The compound plasticizer includes 5 parts of diethylene glycol dibenzoate, 5 parts of isodecyl benzoate, and 20 parts of diisononyl phthalate. Among them, the thixotropic agent is fumed silica, the inorganic filler is calcium carbonate, the stabilizer is zinc oxide, the moisture absorbent is calcium oxide, and the hydrocarbon solvent is D80.

[0032] The vehicle-use low-temperature curing PVC plastisol composition of this embodiment can be prepared with reference to the preparation method of Example 1.

[0033] When the vehicle-use low-temperature curing PVC plastisol composition of this embodiment is in use, it only needs to be adjusted with a compound plasticizer, a hydrocarbon solvent, and an inorganic filler according to the requirements of viscosity, solid content, and density under actual working conditions.

[0034] Comparative Example 1 This comparative example provides a vehicle-use low-temperature curing PVC plastisol composition. By weight, the preparation raw materials include 12 parts of polyvinyl chloride-vinyl acetate copolymer resin, 6 parts of homopolymer PVC paste resin, 2 parts of blended PVC paste resin, 33 parts of compound plasticizer, 3.5 parts of hydrocarbon solvent, 0.6 part of blocked polyurethane, 1.4 parts of polyamide, 0.5 part of thixotropic agent, 35 parts of inorganic filler, 2 parts of stabilizer, and 4 parts of moisture absorbent. The compound plasticizer includes 6.6 parts of isodecyl benzoate and 26.4 parts of diisononyl phthalate. Among them, the thixotropic agent is fumed silica, the inorganic filler is calcium carbonate, the stabilizer is zinc oxide, the moisture absorbent is calcium oxide, and the hydrocarbon solvent is D60.

[0035] The vehicle-use low-temperature curing PVC plastisol composition of this comparative example can be prepared by referring to the preparation method of Example 1.

[0036] Comparative Example 2 This comparative example provides a vehicle-use low-temperature curing PVC plastisol composition. By weight, the preparation raw materials include 12 parts of polyvinyl chloride-vinyl acetate copolymer resin, 6 parts of homopolymer PVC paste resin, 2 parts of blended PVC paste resin, 33 parts of compound plasticizer, 3.5 parts of hydrocarbon solvent, 0.6 part of blocked polyurethane, 1.4 parts of polyamide, 0.5 part of thixotropic agent, 35 parts of inorganic filler, 2 parts of stabilizer, and 4 parts of moisture absorbent. The compound plasticizer includes 6.6 parts of diethylene glycol dibenzoate and 26.4 parts of diisononyl phthalate. Among them, the thixotropic agent is fumed silica, the inorganic filler is calcium carbonate, the stabilizer is zinc oxide, the moisture absorbent is calcium oxide, and the hydrocarbon solvent is D60.

[0037] The vehicle-use low-temperature curing PVC plastisol composition of this comparative example can be prepared by referring to the preparation method of Example 1.

[0038] Comparative Example 3 This comparative example provides a vehicle-use low-temperature curing PVC plastisol composition. By weight, the preparation raw materials include 12 parts of polyvinyl chloride-vinyl acetate copolymer resin, 6 parts of homopolymer PVC paste resin, 2 parts of blended PVC paste resin, 33 parts of compound plasticizer, 3.5 parts of hydrocarbon solvent, 0.6 part of blocked polyurethane, 1.4 parts of polyamide, 0.5 part of thixotropic agent, 35 parts of inorganic filler, 2 parts of stabilizer, and 4 parts of moisture absorbent. The compound plasticizer includes 16.5 parts of diethylene glycol dibenzoate and 16.5 parts of isodecyl benzoate. Among them, the thixotropic agent is fumed silica, the inorganic filler is calcium carbonate, the stabilizer is zinc oxide, the moisture absorbent is calcium oxide, and the hydrocarbon solvent is D60.

[0039] The vehicle-use low-temperature curing PVC plastisol composition of this comparative example can be prepared by referring to the preparation method of Example 1.

[0040] Comparative Example 4 This comparative example provides a vehicle-use low-temperature curing PVC plastisol composition. Calculated by weight parts, the preparation raw materials include 12 parts of polyvinyl chloride-vinyl acetate copolymer resin, 6 parts of homopolymer PVC paste resin, 2 parts of blended PVC paste resin, 33 parts of compound plasticizer, 3.5 parts of hydrocarbon solvent, 1.4 parts of polyamide, 0.5 part of thixotropic agent, 35 parts of inorganic filler, 2 parts of stabilizer, and 4 parts of moisture absorbent. The compound plasticizer includes 5.5 parts of diethylene glycol dibenzoate, 5.5 parts of isodecyl benzoate, and 22 parts of diisononyl phthalate. Among them, the thixotropic agent is fumed silica, the inorganic filler is calcium carbonate, the stabilizer is zinc oxide, the moisture absorbent is calcium oxide, and the hydrocarbon solvent is D60.

[0041] The vehicle-use low-temperature curing PVC plastisol composition of this comparative example can be prepared by referring to the preparation method of Example 1.

[0042] Comparative Example 5 This comparative example provides a vehicle-use low-temperature curing PVC plastisol composition. Calculated by weight parts, the preparation raw materials include 12 parts of polyvinyl chloride-vinyl acetate copolymer resin, 6 parts of homopolymer PVC paste resin, 2 parts of blended PVC paste resin, 33 parts of compound plasticizer, 3.5 parts of hydrocarbon solvent, 0.6 part of blocked polyurethane, 0.5 part of thixotropic agent, 35 parts of inorganic filler, 2 parts of stabilizer, and 4 parts of moisture absorbent. The compound plasticizer includes 5.5 parts of diethylene glycol dibenzoate, 5.5 parts of isodecyl benzoate, and 22 parts of diisononyl phthalate. Among them, the thixotropic agent is fumed silica, the inorganic filler is calcium carbonate, the stabilizer is zinc oxide, the moisture absorbent is calcium oxide, and the hydrocarbon solvent is D60.

[0043] The vehicle-use low-temperature curing PVC plastisol composition of this comparative example can be prepared by referring to the preparation method of Example 1.

[0044] The appearance, density, viscosity, fineness, solid content, and sag limit of the vehicle-use low-temperature curing PVC plastisol compositions of Examples 1 to 3 and Comparative Examples 1 to 5 are tested. Among them, for appearance: Use a spatula to evenly coat 20 g to 30 g of the sample on the cleaned substrate and observe the surface state; for density: Tested according to Method B in GB / T 1756-1979; for viscosity: Tested according to GB / T2794-2022; for fineness: Tested according to GB / T 1724-2019; for solid content: Tested according to GB / T 2793-1995; for sag limit: Tested according to GB / T 9264-1988.

[0045] The vehicle-use low-temperature curing PVC plastisol compositions of Examples 1 to 3 and Comparative Examples 1 to 5 were respectively scrape-coated on steel plates of 150 mm × 70 mm × 1 mm, and then baked and cured (the curing conditions of Examples 1 to 3 and Comparative Examples 1 to 5 are shown in Table 2) to obtain dry films with a thickness of 2 mm. After storing the dry films at room temperature for 24 h, their hardness, elongation at break, tensile strength, adhesion, shear strength, yellowing resistance performance, and VOC emissions were tested. Among them, hardness: obtained by testing according to GB / T 531-1999; elongation at break: obtained by testing according to GB / T 528-2009; tensile strength: obtained by testing according to GB / T 528-2009; adhesion: according to the standard of GB / T 9286-88, the cross-cut method was used for the 100-grid adhesion test (the adhesion level from high to low is 5 levels > 4 levels > 3 levels > 2 levels > 1 level > 0 level); shear strength: obtained by testing according to GB / T 7214-2008; yellowing resistance: evaluated by the colorimetric method; VOC: obtained by testing according to 10.3 of GB / T 23986-2009.

[0046] The vehicle-use low-temperature curing PVC plastisol compositions of Examples 1 to 3 and Comparative Examples 1 to 5 were respectively scrape-coated on 150 mm × 70 mm × 1 mm steel plates, and then baked and cured (the curing conditions of Examples 1 to 3 and Comparative Examples 1 to 5 are shown in Table 2) to obtain dry films with a thickness of 2 mm. Then, an intermediate paint and a topcoat were successively brush-coated on the dry films, and after drying, a composite film layer was obtained, and the adhesion of the composite film layer was tested.

[0047] The above performance test results are shown in Table 2.

[0048] Table 2 Performance test results of the vehicle-use low-temperature curing PVC plastisol compositions of Examples 1 to 3 and Comparative Examples 1 to 5.

[0049]

[0050] Specifically, as shown in the test results in Table 2, from the test results of Examples 1 to 3 and Comparative Examples 1 to 5, it can be seen that the low-temperature curing PVC plastisol composition of the present invention can be cured at a minimum under the conditions of a baking temperature of 125 °C and a baking time of 20 min, and has good mechanical properties. This may be because the PVC plastisol composition of the present invention includes a low-temperature plasticizing PVC paste resin system composed of polyvinyl chloride-vinyl acetate copolymer resin, homopolymer PVC paste resin, and blended PVC paste resin, and raw materials such as a compound plasticizer, blocked polyurethane, and polyamide are added thereto. Among them, the compound plasticizer includes diethylene glycol dibenzoate, isodecyl benzoate, and diisononyl phthalate. Diethylene glycol dibenzoate can effectively reduce the plasticizing temperature of the PVC paste resin system and improve the tensile strength, elongation at break, and shear strength after curing of the composition system. Isodecyl benzoate can reduce the plasticizing temperature of the PVC paste resin and improve the storage stability of the composition. Diisononyl phthalate is environmentally friendly and thus can reduce the impact of the composition system on the environment. Therefore, the combined use of the foregoing compound plasticizer can effectively reduce the plasticizing temperature of the PVC paste resin system while reducing the impact on the environment and improving the mechanical strength, enabling it to be cured at a minimum under the conditions of 125 °C and 20 min. Due to the low baking temperature and short time, the composition system of the present invention also has excellent yellowing resistance. The combined use of blocked polyurethane and polyamide can effectively improve the adhesion between the composition system and the substrate after curing into a film, and at the same time has excellent compatibility with the primer surfacer and topcoat, can meet the B1B2, 3C2B, and 3C1B processes, reduces the number of vehicle baking times, and reduces VOC emissions while reducing energy consumption.

[0051] Furthermore, from Examples 1 and Comparative Examples 1 to 3, it can be seen that when any one of diethylene glycol dibenzoate, isodecyl benzoate, and diisononyl phthalate is missing, most of the mechanical properties will show a downward trend, and at the same time, the curing temperature is higher and the curing time is longer.

[0052] From Examples 1 and Comparative Examples 4 to 5, it can be seen that when any one of blocked polyurethane and polyamide is missing, the adhesion will decrease and affect most of the mechanical properties of the paint film.

[0053] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, it is not limited to only those listed in the examples. Those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A low-temperature curing PVC plastisol composition for vehicles, characterized in that, By weight parts, the preparation raw materials include 5 to 15 parts of polyvinyl chloride-vinyl acetate copolymer resin, 5 to 15 parts of homopolymer PVC paste resin, 1 to 10 parts of blended PVC paste resin, 30 to 40 parts of compound plasticizer, 1 to 10 parts of hydrocarbon solvent, 0.5 to 1.5 parts of blocked polyurethane, 0.5 to 2 parts of polyamide, 0.5 to 1 part of thixotropic agent, 30 to 45 parts of inorganic filler, 1 to 5 parts of stabilizer, and 1 to 5 parts of moisture absorbent. The compound plasticizer includes diethylene glycol dibenzoate, isodecyl benzoate, and diisononyl phthalate.

2. The vehicle-use low-temperature curable PVC plastisol composition according to claim 1, characterized in that, The weight ratio of the diethylene glycol dibenzoate, the isodecyl benzoate, and the diisononyl phthalate is 1 to 2:1 to 2:2 to 6.

3. The vehicle-use low-temperature curable PVC plastisol composition according to claim 1, wherein The content of vinyl acetate in the polyvinyl chloride-vinyl acetate copolymer resin is 6% to 10%.

4. The vehicle-use low-temperature curable PVC plastisol composition according to claim 1, wherein, The polyvinyl chloride-vinyl acetate copolymer resin is selected from at least one of Arkema LACOVYL PA 1384 in France, Shenyang Chemical Industry PCMA-12 in China, and Formosa Plastics Corporation PR640 in Chinese Taipei.

5. The vehicle-use low-temperature curable PVC plastisol composition according to claim 1, characterized in that, The homopolymer PVC paste resin is selected from at least one of Siamvic 370HD in Thailand and Shenyang Chemical Industry PSM-31 in China.

6. The vehicle-use low-temperature curable PVC plastisol composition according to claim 1, wherein, The blended PVC paste resin is selected from at least one of Vinnolit SA1062 / 7 in Germany and Vinnolit C66W in Germany.

7. The vehicle-use low-temperature curable PVC plastisol composition according to claim 1, wherein The stabilizer includes at least one of zinc oxide and magnesium oxide. The moisture absorbent includes at least one of calcium oxide and molecular sieve. The hydrocarbon solvent is selected from at least one of D60 and D80.

8. The vehicle-use low-temperature curable PVC plastisol composition according to claim 1, wherein The thixotropic agent is selected from at least one of fumed silica and aerosil.

9. The vehicle-use low-temperature curable PVC plastisol composition according to claim 1, wherein The inorganic filler includes at least one of carbonate and modified carbonate.

10. The preparation method of the vehicle-use low-temperature curing PVC plastisol composition according to any one of claims 1 to 9, characterized in that, It includes the steps: (1) According to the raw material ratio, add the compound plasticizer into a stirring kettle, and while stirring, add linear alkane, blocked polyurethane, polyamide, thixotropic agent, stabilizer, and moisture absorbent, and mix evenly to obtain a first mixture; (2) Start high-speed stirring, and sequentially add inorganic filler, polyvinyl chloride-vinyl acetate copolymer resin, homopolymer PVC paste resin, and blended PVC paste resin into the first mixture, control the stirring temperature at 35°C or below, and mix evenly to obtain a second mixture; (3) Carry out aging, degassing, filtering, and filling on the second mixture.

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