An interior trim part uv-cured coating and a method for preparing the same

Abstract

This invention relates to the field of coating preparation technology, specifically disclosing a UV-curable coating for automotive interior parts and its preparation method. This invention solves the technical problems of traditional automotive interior UV coatings, which often suffer from brittleness, decreased adhesion, and insufficient aging resistance when balancing high hardness and high weather resistance, by using a combination of silicone-modified acrylic resin, aliphatic hexafunctional polyurethane acrylic resin, and composite modified fillers. The coating provided by this invention not only exhibits excellent adhesion to commonly used plastic substrates in automotive interiors but also endows the coating with superior resistance to light aging and chemical wiping, fully meeting the requirements of automotive cabins for high-quality and long-life interior coatings.

Description

Technical Field

[0001] This invention relates to the field of coating preparation technology, specifically to a UV-curable coating for automotive interior parts and its preparation method. Background Technology

[0002] Interior structural components such as automotive dashboards, center console trim, door armrests, and function buttons are generally injection molded from thermoplastic engineering plastics such as PC, ABS, and PC / ABS alloys. To ensure a consistent appearance and texture of the plastic parts and to provide long-lasting surface protection for the substrate, the industry typically applies a protective coating to the surface of these plastic components. These interior components are areas of high-frequency contact for occupants, placing stringent requirements on the overall performance of the coating. It must not only possess excellent physical protective properties such as scratch and abrasion resistance, but also maintain stable coating appearance and adhesion to the substrate under complex conditions such as long-term sunlight exposure, alternating high and low temperatures, and humid heat cycles inside the vehicle, preventing failure.

[0003] Compared to traditional two-component thermosetting solvent-based coatings, UV-cured coatings have become the mainstream process and core development direction for automotive plastic interior coatings due to their outstanding advantages such as fast curing rate, high production cycle, low energy consumption, and low VOC emissions. However, currently available commercial and existing automotive interior UV-cured coatings still have shortcomings in overall performance and are difficult to meet the requirements of high-end automotive-grade applications.

[0004] On the one hand, in the enclosed environment of a car cabin, interior coatings are subject to long-term and repeated contact with human sweat, sebum, skin care products, sunscreen, and alcohol-based disinfectants and cleaning agents. Conventional UV-cured coatings have insufficient cross-linking network density, resulting in micropores within the coating film. Furthermore, the bonding effect between the filler and the resin matrix is ​​poor, allowing various chemical media to easily penetrate and infiltrate the coating, causing swelling and softening of the coating film. This leads to defects such as loss of gloss, stickiness, and peeling, and the coating's chemical resistance, stain resistance, and long-term stability are also poor.

[0005] On the other hand, existing technologies for improving coating hardness and wear resistance are relatively limited, mainly involving increasing the amount of multifunctional active monomers or directly blending inorganic mineral fillers. High-functionality monomers, with their rapid curing and polymerization rates and high crosslinking density, experience significant volume shrinkage during molding, easily accumulating substantial residual internal stress within the coating. This significantly increases coating brittleness, leading to cracking and delamination under vehicle thermal cycling and external friction and impact conditions, drastically reducing adhesion to the plastic substrate. Directly blending unmodified inorganic mineral fillers generally suffers from uneven dispersion in the resin system, easy sedimentation and agglomeration, and poor interfacial compatibility. This not only easily causes pinholes and defects in the coating but also weakens the interfacial bonding strength between the resin matrix and the filler, failing to achieve long-term improvements in wear resistance and hardness while ensuring coating adhesion and weather resistance.

[0006] Therefore, developing a UV-curable coating specifically for automotive interiors that combines high adhesion, high hardness, excellent chemical resistance, and weather stability is of significant engineering application value in overcoming existing technological bottlenecks and meeting the stringent requirements of high-end automotive interior coatings. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a UV-curable coating for automotive interior parts and its preparation method.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A UV-curable coating for automotive interior parts, the UV-curable coating comprising the following raw materials in parts by weight: 60-80 parts of silicone-modified acrylic resin, 10-20 parts of acrylic resin, 10-15 parts of aliphatic hexafunctional polyurethane acrylic resin, 5-10 parts of isobornyl acrylate, 5-12 parts of composite modified filler, 0.5-1 part of leveling agent, 0.2-0.5 parts of defoamer, 3-6 parts of photoinitiator, 10-15 parts of ethyl acetate, and 20-30 parts of propylene glycol methyl ether acetate.

[0009] In the technical solution disclosed in this invention, silicone-modified acrylic resin is used as a film-forming matrix to impart adhesion to the coating base. The number of parts of silicone-modified acrylic resin can be selected as 60 parts, 62 parts, 65 parts, 68 parts, 70 parts, 72 parts, 75 parts, 78 parts, or 80 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0010] In the technical solution disclosed in this invention, acrylic resin is used as an auxiliary film-forming resin to adjust the viscosity and rheological properties of the coating system and enhance the wettability to substrates such as PC / ABS. The amount of acrylic resin can be selected from 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, and 20 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0011] In the technical solution disclosed in this invention, aliphatic hexafunctional polyurethane acrylic resin is used as a high-functionality crosslinking component. Through photocuring, a dense three-dimensional crosslinking network is formed to improve the hardness and chemical resistance of the coating. The amount of aliphatic hexafunctional polyurethane acrylic resin can be selected from 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, or 15 parts, but is not limited to the listed values; other unlisted values ​​within the range are also applicable.

[0012] In the technical solution disclosed in this invention, isobornyl acrylate is used as a monofunctional active diluent to reduce the viscosity of the coating. The amount of isobornyl acrylate can be selected from 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0013] In the technical solution disclosed in this invention, the composite modified filler, as a functional reinforcing filler, is mainly used to improve the wear resistance, scratch resistance, and UV aging resistance of the coating. The number of parts of the composite modified filler can be selected as 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, or 12 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0014] In the technical solution disclosed in this invention, the preparation method of the composite modified filler is as follows: S1. Mix isophorone diisocyanate, 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate and stannous octoate evenly, and heat to react to obtain the modifier. S2. Disperse bentonite in deionized water using ultrasound, then add cerium salt and ammonia water, and perform a hydrothermal reaction. After the reaction is complete, centrifuge, wash, dry, grind and sieve to obtain the composite filler. S3. Disperse the composite filler in butyl acetate, then add the modifier, heat and stir to react. After the reaction is complete, filter, wash and dry to obtain the composite modified filler.

[0015] Specifically, in step S1, the molar ratio of isophorone diisocyanate, 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate and stannous octoate is 1-1.2:1:0.002-0.005.

[0016] Specifically, in step S1, the temperature of the heating reaction is 55-65℃, and the heating reaction time is 2-4 hours.

[0017] Specifically, in step S2, the mass ratio of bentonite, cerium salt and ammonia is 10:2-4:10-15, and the mass fraction of ammonia is 5-10%.

[0018] Specifically, the cerium salt is selected from cerium nitrate or cerium chloride.

[0019] Specifically, in step S2, the hydrothermal reaction temperature is 120-150℃, and the hydrothermal reaction time is 3-5 hours.

[0020] Specifically, in step S3, the mass ratio of composite filler to modifier is 10:2-5.

[0021] Specifically, in step S3, the temperature for heating and stirring the reaction is 65-80℃, and the reaction time is 2-4 hours.

[0022] In the technical solution disclosed in this invention, the leveling agent is used to reduce the surface tension of the coating system. The amount of leveling agent can be selected as 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, or 1 part, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0023] Specifically, the leveling agent is selected from at least one of leveling agent SC-333, leveling agent BYK-333, and leveling agent KF-640.

[0024] In the technical solution disclosed in this invention, the defoamer is used to reduce the stability of the microbubble liquid film. The amount of defoamer can be selected as 0.2 parts, 0.3 parts, 0.4 parts, or 0.5 parts, but is not limited to the listed values; other unlisted values ​​within the range are also applicable.

[0025] Specifically, the defoamer is selected from byk-055 or byk-052.

[0026] In the technical solution disclosed in this invention, the photoinitiator absorbs light energy and decomposes under ultraviolet irradiation to generate active free radicals, which initiate a chain polymerization reaction of unsaturated double bonds in the resin and active monomers, thereby achieving curing and crosslinking of the coating film. The amount of photoinitiator can be selected from 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, and 6 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0027] Specifically, the photoinitiator is selected from at least one of ultraviolet photoinitiator 907, ultraviolet photoinitiator TPO, ultraviolet photoinitiator 184, and ultraviolet photoinitiator 1173.

[0028] In the technical solution disclosed in this invention, ethyl acetate is used as a solvent. The amount of ethyl acetate can be selected as 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, or 15 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0029] In the technical solution disclosed in this invention, propylene glycol methyl ether acetate is used as a solvent. The amount of propylene glycol methyl ether acetate can be selected as 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, or 30 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0030] The present invention also provides a method for preparing the above-mentioned UV-curable coating for automotive interior parts, comprising the following steps: mixing organosilicon-modified acrylic resin, acrylic resin, aliphatic hexafunctional polyurethane acrylic resin, isoborneol acrylate, leveling agent, defoamer, ethyl acetate and propylene glycol methyl ether acetate in parts by weight, and then adding composite modified filler and photoinitiator thereto, stirring and mixing evenly to obtain the UV-curable coating for automotive interior parts.

[0031] Compared with the prior art, the present invention has the following beneficial effects: (1) This invention solves the technical problems of traditional automotive interior UV coatings, which tend to become brittle, have reduced adhesion, and lack sufficient aging resistance when balancing high hardness and high weather resistance, by using a combination of organosilicon-modified acrylic resin, aliphatic hexafunctional polyurethane acrylic resin, and composite modified fillers. The coating provided by this invention not only has excellent adhesion to commonly used plastic substrates in automotive interiors, but also endows the coating with excellent light aging resistance and chemical wiping resistance, fully meeting the requirements of automotive cabins for high-quality and long-life interior coatings.

[0032] (2) This invention improves the density of the bentonite lamellar structure by loading cerium oxide onto bentonite, creating a dense and tortuous penetration path, which significantly enhances the physical barrier ability of the coating against media such as sweat and alcohol reagents. At the same time, cerium oxide has excellent UV shielding and free radical capture properties, which significantly improves the coating's resistance to UV aging and yellowing. Then, by further grafting 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate, fluorine-containing low surface energy segments and UV-polymerizable double bonds are introduced into the filler surface simultaneously. This not only endows the coating with low surface energy and excellent stain resistance and scratch resistance, but also allows the modified filler to be tightly anchored in the resin crosslinking network through covalent bonds during the photocuring process, effectively overcoming the technical defects of conventional inorganic fillers that are prone to agglomeration and have weak interfacial bonding with the organic matrix. The composite modified filler provided by this invention achieves multiple synergies of physical barrier, UV weather resistance and interfacial enhancement, effectively taking into account the coating's hardness, wear resistance and substrate adhesion, and significantly improving the technical drawbacks of the unbalanced comprehensive performance of traditional UV coatings. Detailed Implementation

[0033] The present invention will be further described in detail below through specific preferred embodiments, but the present invention is not limited to the following embodiments.

[0034] It should be noted that, unless otherwise specified, all chemical reagents involved in this invention were purchased through commercial channels.

[0035] The silicone-modified acrylic resin used in this embodiment of the invention is grade S-611, which is sourced from Jining Fangyu Chemical Co., Ltd. The acrylic resin grade is AC8051, sourced from Guangzhou Qiyuan New Materials Co., Ltd. The grade of aliphatic hexafunctional polyurethane acrylic resin is RJ423, which is sourced from Jiangsu Haolong Chemical Co., Ltd. CAS number for isoborneol acrylate: 5888-33-5; CAS No. 16083-81-1 for 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate; The bentonite has a mesh size of 400.

[0036] Example 1 A method for preparing a UV-curable coating for automotive interior parts includes the following steps: 70 parts of silicone-modified acrylic resin, 15 parts of acrylic resin, 12 parts of aliphatic hexafunctional polyurethane acrylic resin, 8 parts of isoborneol acrylate, 0.8 parts of leveling agent SC-333, 0.3 parts of defoamer byk-055, 10 parts of ethyl acetate and 25 parts of propylene glycol methyl ether acetate were mixed evenly. Then, 8 parts of composite modified filler and 5 parts of UV photoinitiator TPO were added and stirred evenly to obtain a UV-curable coating for automotive interior parts.

[0037] The preparation method of the composite modified filler is as follows: S1. Mix 0.1 mol isophorone diisocyanate, 0.1 mol 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate and 0.0003 mol stannous octoate evenly, and then heat at 60°C for 3 hours. After the reaction is completed, the modifier is obtained. S2. Disperse 10g of bentonite in 100mL of deionized water using ultrasonication, then add 2g of cerium nitrate hexahydrate and 10g of 10wt% ammonia water. Perform a hydrothermal reaction at 120℃ for 5h. After the reaction is complete, centrifuge, wash, dry, and grind through a 400-mesh sieve to obtain the composite filler. S3. Disperse 10g of composite filler in 100mL of butyl acetate, then add 3g of modifier, heat and stir at 65℃ for 4h. After the reaction is completed, filter, wash and dry to obtain composite modified filler.

[0038] Example 2 A method for preparing a UV-curable coating for automotive interior parts includes the following steps: 60 parts of silicone-modified acrylic resin, 10 parts of acrylic resin, 10 parts of aliphatic hexafunctional polyurethane acrylic resin, 5 parts of isoborneol acrylate, 0.5 parts of leveling agent SC-333, 0.2 parts of defoamer byk-055, 10 parts of ethyl acetate and 20 parts of propylene glycol methyl ether acetate are mixed evenly. Then, 5 parts of composite modified filler and 3 parts of UV photoinitiator TPO are added and stirred evenly to obtain a UV-curable coating for automotive interior parts.

[0039] The preparation method of the composite modified filler is as follows: S1. Mix 0.1 mol isophorone diisocyanate, 0.1 mol 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate and 0.0003 mol stannous octoate evenly, and then heat at 60°C for 3 hours. After the reaction is completed, the modifier is obtained. S2. Disperse 10g of bentonite in 100mL of deionized water using ultrasonication, then add 4g of cerium nitrate hexahydrate and 15g of 10wt% ammonia water. Perform a hydrothermal reaction at 120℃ for 5h. After the reaction is complete, centrifuge, wash, dry, and grind through a 400-mesh sieve to obtain the composite filler. S3. Disperse 10g of composite filler in 100mL of butyl acetate, then add 2g of modifier, heat and stir at 65℃ for 4h. After the reaction is completed, filter, wash and dry to obtain composite modified filler.

[0040] Example 3 A method for preparing a UV-curable coating for automotive interior parts includes the following steps: 80 parts of silicone-modified acrylic resin, 20 parts of acrylic resin, 15 parts of aliphatic hexafunctional polyurethane acrylic resin, 10 parts of isoborneol acrylate, 1 part of leveling agent SC-333, 0.5 parts of defoamer byk-055, 15 parts of ethyl acetate and 30 parts of propylene glycol methyl ether acetate are mixed evenly. Then, 12 parts of composite modified filler and 6 parts of UV photoinitiator TPO are added and stirred evenly to obtain a UV-curable coating for automotive interior parts.

[0041] The preparation method of the composite modified filler is as follows: S1. Mix 0.1 mol isophorone diisocyanate, 0.1 mol 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate and 0.0003 mol stannous octoate evenly, and then heat at 60°C for 3 hours. After the reaction is completed, the modifier is obtained. S2. Disperse 10g of bentonite in 100mL of deionized water using ultrasonication, then add 3g of cerium nitrate hexahydrate and 12g of 10wt% ammonia water. Perform a hydrothermal reaction at 120℃ for 5h. After the reaction is complete, centrifuge, wash, dry, and grind through a 400-mesh sieve to obtain the composite filler. S3. Disperse 10g of composite filler in 100mL of butyl acetate, then add 5g of modifier, heat and stir at 65℃ for 4h. After the reaction is completed, filter, wash and dry to obtain composite modified filler.

[0042] Comparative Example 1 A method for preparing a UV-curable coating for automotive interior parts includes the following steps: 70 parts of silicone-modified acrylic resin, 15 parts of acrylic resin, 12 parts of aliphatic hexafunctional polyurethane acrylic resin, 8 parts of isoborneol acrylate, 0.8 parts of leveling agent SC-333, 0.3 parts of defoamer byk-055, 10 parts of ethyl acetate and 25 parts of propylene glycol methyl ether acetate were mixed evenly. Then, 8 parts of bentonite and 5 parts of UV photoinitiator TPO were added and stirred evenly to obtain a UV-curable coating for automotive interior parts.

[0043] Compared with Example 1, no modification treatment was performed on the bentonite in Comparative Example 1.

[0044] Comparative Example 2 A method for preparing a UV-curable coating for automotive interior parts includes the following steps: 70 parts of silicone-modified acrylic resin, 15 parts of acrylic resin, 12 parts of aliphatic hexafunctional polyurethane acrylic resin, 8 parts of isoborneol acrylate, 0.8 parts of leveling agent SC-333, 0.3 parts of defoamer byk-055, 10 parts of ethyl acetate and 25 parts of propylene glycol methyl ether acetate were mixed evenly. Then, 8 parts of composite filler and 5 parts of UV photoinitiator TPO were added and stirred evenly to obtain a UV-curable coating for automotive interior parts.

[0045] The preparation method of the composite filler is as follows: 10g of bentonite was ultrasonically dispersed in 100mL of deionized water, and then 2g of cerium nitrate hexahydrate and 10g of 10wt% ammonia water were added. The mixture was then subjected to a hydrothermal reaction at 120℃ for 5 hours. After the reaction was completed, the mixture was centrifuged, washed, dried, and ground through a 400-mesh sieve to obtain the composite filler.

[0046] Compared with Example 1, Comparative Example 2 did not involve grafting 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate onto the composite filler.

[0047] Comparative Example 3 A method for preparing a UV-curable coating for automotive interior parts includes the following steps: 70 parts of silicone-modified acrylic resin, 15 parts of acrylic resin, 12 parts of aliphatic hexafunctional polyurethane acrylic resin, 8 parts of isoborneol acrylate, 0.8 parts of leveling agent SC-333, 0.3 parts of defoamer byk-055, 10 parts of ethyl acetate and 25 parts of propylene glycol methyl ether acetate were mixed evenly. Then, 8 parts of composite modified filler and 5 parts of UV photoinitiator TPO were added and stirred evenly to obtain a UV-curable coating for automotive interior parts.

[0048] The preparation method of the composite modified filler is as follows: S1. Mix 0.1 mol isophorone diisocyanate, 0.1 mol 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate and 0.0003 mol stannous octoate evenly, and then heat at 60°C for 3 hours. After the reaction is completed, the modifier is obtained. S2. Disperse 10g of bentonite in 100mL of butyl acetate, then add 3g of modifier, heat and stir at 65℃ for 4h. After the reaction is complete, filter, wash and dry to obtain the composite modified filler.

[0049] Compared to Example 1, Comparative Example 3 did not involve loading cerium oxide onto bentonite.

[0050] The coatings prepared in Examples 1-3 and Comparative Examples 1-3 of this invention were sprayed onto clean PC / ABS substrate surfaces and baked in an oven at 60°C for 15 minutes, followed by UV treatment at 1000 mJ / cm². 2 The light intensity is 80mW / cm 2 UV curing was performed under irradiation intensity to obtain a coating sample with a dry film thickness of 30±2 μm, and then performance testing was conducted.

[0051] Adhesion test: Determined according to GB / T 9286-2021 standard; Pencil hardness: Measured according to GB / T 6739-2022 standard; Hydrolysis resistance test: Standard test specimens were prepared according to the requirements of Volkswagen standard TL226. Ten standard test specimens were prepared for each type of sample. Then, the hydrolysis test was carried out according to the conditions required in the standard. The specimens were placed in a climate chamber with a temperature of 90±2℃ and a relative humidity of 95±3% until the paint film surface turned white or cracked. The duration was recorded and the average value was taken. UV aging resistance test: The test was conducted using a QUV aging machine with a light intensity set to 750W / m². 2 The observation period is 168 hours, during which yellowing occurs. Alcohol resistance: The coating was tested using an alcohol abrasion tester. A white non-woven fabric was soaked in anhydrous ethanol, subjected to a 1000-gram load, at a speed of 60 times / minute, for 300 cycles. The appearance of the coating was then observed for any significant changes or dissolution. The test results are shown in Table 1.

[0052] Table 1 Performance test results for different groups A comparison of Examples 1-3 and Comparative Examples 1-3 shows that by adding the composite modified filler from the embodiments of the present invention, the adhesion, pencil hardness, hydrolysis time resistance, UV aging resistance, and alcohol resistance of the prepared coating are significantly improved.

[0053] Finally, it should be noted that the above embodiments do not limit the present invention in any way. Those skilled in the art can make modifications and improvements based on the present invention. Therefore, any modifications or improvements made without departing from the spirit of the present invention are within the scope of protection claimed by the present invention.

Claims

1. A UV-curable coating for automotive interior parts, characterized in that, The UV-curable coating comprises the following raw materials in parts by weight: 60-80 parts of silicone-modified acrylic resin, 10-20 parts of acrylic resin, 10-15 parts of aliphatic hexafunctional polyurethane acrylic resin, 5-10 parts of isobornyl acrylate, 5-12 parts of composite modified filler, 0.5-1 part of leveling agent, 0.2-0.5 parts of defoamer, 3-6 parts of photoinitiator, 10-15 parts of ethyl acetate, and 20-30 parts of propylene glycol methyl ether acetate.

2. The UV-curable coating for automotive interior parts according to claim 1, characterized in that, The preparation method of the composite modified filler is as follows: S1. Mix isophorone diisocyanate, 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate and stannous octoate evenly, and heat to react to obtain the modifier. S2. Disperse bentonite in deionized water using ultrasonication, then add cerium salt and ammonia water, and perform a hydrothermal reaction. After the reaction is complete, centrifuge, wash, dry, grind and sieve to obtain the composite filler. S3. Disperse the composite filler in butyl acetate, then add the modifier, heat and stir to react. After the reaction is complete, filter, wash and dry to obtain the composite modified filler.

3. The UV-curable coating for automotive interior parts according to claim 2, characterized in that, In step S1, the molar ratio of isophorone diisocyanate, 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate and stannous octoate is 1-1.2:1:0.002-0.

005.

4. The UV-curable coating for automotive interior parts according to claim 2, characterized in that, In step S1, the temperature of the heating reaction is 55-65℃, and the heating reaction time is 2-4h.

5. The UV-curable coating for automotive interior parts according to claim 2, characterized in that, In step S2, the mass ratio of bentonite, cerium salt and ammonia is 10:2-4:10-15, and the mass fraction of ammonia is 5-10%.

6. The UV-curable coating for automotive interior parts according to claim 2, characterized in that, In step S2, the hydrothermal reaction temperature is 120-150℃, and the hydrothermal reaction time is 3-5h.

7. The UV-curable coating for automotive interior parts according to claim 2, characterized in that, In step S3, the mass ratio of composite filler to modifier is 10:2-5.

8. The UV-curable coating for automotive interior parts according to claim 2, characterized in that, In step S3, the temperature for heating and stirring the reaction is 65-80℃, and the reaction time is 2-4 hours.

9. The UV-curable coating for automotive interior parts according to claim 1, characterized in that, The leveling agent is selected from at least one of leveling agent SC-333, leveling agent BYK-333, and leveling agent KF-640; the defoamer is selected from byk-055 or byk-052; and the photoinitiator is selected from at least one of ultraviolet photoinitiator 907, ultraviolet photoinitiator TPO, ultraviolet photoinitiator 184, and ultraviolet photoinitiator 1173.

10. The method for preparing the UV-curable coating for automotive interior parts according to any one of claims 1-9, characterized in that, The process includes the following steps: mixing organosilicon-modified acrylic resin, acrylic resin, aliphatic hexafunctional polyurethane acrylic resin, isoborneol acrylate, leveling agent, defoamer, ethyl acetate and propylene glycol methyl ether acetate in parts by weight until homogeneous; then adding composite modified filler and photoinitiator and stirring until homogeneous to obtain a UV-curable coating for automotive interior parts.

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