High-wear-resistant paint for automobile ornaments, preparation method and application

Abstract

The invention discloses a high-wear-resistance coating for automobile ornaments, a preparation method and application, and relates to the technical field of automobile paints.The high-wear-resistance coating comprises fluorine-modified polycarbonate resin, fluorine-silicon synergistic core-shell particles, a photoinitiator, a reactive diluent, polytetrafluoroethylene wax and a flatting agent; the preparation is carried out based on the above components. According to the high-wear-resistance coating for the automobile ornaments, the preparation method and the application, the wear resistance and the dispersion stability of the coating are remarkably improved by constructing a fluorine-silicon synergistic core-shell structure taking the gamma-aluminum oxide nanorod as a core and the fluorine-containing polymer as a shell; fluorine-modified polycarbonate resin is adopted to construct a low-surface-energy film-forming system, so that the sweat and ethanol corrosion resistance is improved; and a UV-heat synergistic curing process is introduced, so that efficient and rapid curing and excellent surface quality are realized while the film thickness and the energy consumption are reduced. The whole system is superior to the prior art in the aspects of wear resistance, chemical resistance, energy consumption control and construction adaptability, and has remarkable comprehensive performance improvement and wide industrial application value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile coating, in particular to a high-wear-resistance coating for automobile trim parts, a preparation method and application. BACKGROUND

[0002] The high-gloss or matte wear-resistant coatings for automobile interior and exterior trim parts generally have the following defects: Insufficient mechanical wear resistance: the Taber abrasion value of traditional polyurethane or acrylic coatings is generally > 50 mg / 1000 revolutions, and obvious scratches appear in the high-contact areas such as door handles within 6 months in actual use.

[0003] Poor chemical resistance: severe loss of gloss or swelling phenomenon easily occurs to sweat, alcohol and other common contact media, for example, the gloss loss rate is > 60% after 48 hours of immersion in pH 4.5 sweat, and the surface is blistered and deformed after 500 times of rubbing with ethanol.

[0004] Complex process and high energy consumption: the current mainstream 3-coat 2-bake system (base coat + mid coat + top coat) has a total film thickness > 80 μm, which not only has a complex process, but also causes high energy consumption and an increase of about 35% in unit cost.

[0005] Difficult dispersion of functional particles: direct introduction of nano-Al2O3 particles easily causes agglomeration (D50 > 500 nm), resulting in a decrease of system stability and impact strength by 40%.

[0006] To solve the above problems, the present application provides a core-shell structure nanoparticle based on fluorine-silicon synergistic construction, a high-performance wear-resistant coating system combining fluorine-modified resin and ultraviolet-thermal dual curing, which takes into account mechanical properties, chemical stability, energy consumption optimization and particle dispersion performance, and has a broad engineering application prospect. SUMMARY

[0007] In view of the deficiencies of the prior art, the present application provides a high-wear-resistance coating for automobile trim parts, a preparation method and application to solve the problems raised in the background art.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical scheme: The present application provides a high-wear-resistance coating for automobile trim parts, which comprises the following components in parts by mass: Fluorine-modified polycarbonate resin: 100 parts; Fluorine-silicon synergistic core-shell particles: 8-12 parts; Photoinitiator: 2-3 parts; Active diluent: 15-20 parts; Polytetrafluoroethylene wax: 3-5 parts; Leveling agent: 0.7-0.9 parts.

[0009] Further optimize the technical scheme, the fluorine modified polycarbonate resin is composed of fluorine functional group grafted modified polycarbonate molecular chain, the fluorine functional group adopts fluorinated alkyl group, the grafting fluorine content is 12wt%, the stable low surface energy molecular skeleton is constructed through carbon-fluorine bond structure.

[0010] Further optimize the technical scheme, the fluorine silicon synergistic core-shell particle is used as wear-resistant reinforcing phase, the core layer of the particle is γ-alumina nanorod, has specific surface area≥180m² / g, length-diameter ratio≥3:1 spatial orientation structure; the shell layer is composed of trifluoroethyl methacrylate and polyurethane acrylate copolymer, the grafting rate is not less than 85%, the shell layer thickness is controlled between 10-20nm, the nanometer core particle is stably coated by chemical bond mode.

[0011] Further optimize the technical scheme, the photoinitiator is TPO-L, TPO-L is acyloxy phosphine oxide compound, the maximum absorption wavelength is located at 380nm, high efficiency free radical release is realized under 365±10nm wavelength; The leveling agent is silicone modified acrylate polymer BYK-333, the dynamic surface tension is 28mN / m, is used for rapid expansion on coating surface.

[0012] Further optimize the technical scheme, the active diluent is 1,6-hexanediol diacrylate HDDA, HDDA is linear difunctional monomer, the viscosity is 1500cP at 25℃; The polytetrafluoroethylene wax is micronized polytetrafluoroethylene particle, the average particle size is 3μm, is in microparticle dispersion state in coating system, forms microcosmic low friction structure on film layer surface.

[0013] A preparation method of automobile ornament high wear-resistant coating, based on the above automobile ornament high wear-resistant coating, comprising the following steps: S1, preparation of fluorine silicon synergistic core-shell particle; S2, construction and stable dispersion of coating precursor.

[0014] Further optimize the technical scheme, in the step S1, the γ-alumina nanorod is vacuum dried at 120℃ to remove surface adsorbed water and impurities; The obtained dried γ-alumina nanorod is dispersed in anhydrous ethanol solution of KH-570 silane coupling agent, and is magnetically stirred at room temperature for 60 minutes; Under the protection of continuously introduced nitrogen atmosphere, the shell monomer system pre-mixed by trifluoroethyl methacrylate and polyurethane acrylate at mass ratio of 3:2 is added dropwise at 80℃, peroxide initiator is added for free radical initiation polymerization, and the reaction time is controlled for 4 hours, finally the fluorine silicon synergistic core-shell structure with shell thickness of 10-20nm is obtained. After the polymerization is completed, the fluorosilicon synergistic core-shell particles with good dispersibility are obtained by washing with ethanol, centrifugal separation three times, and drying.

[0015] Further optimization of the technical solution, in step S2, the fluorine modified polycarbonate resin and the active diluent are added to the stirring reaction kettle, and low-speed stirring is carried out under the condition of 25±2℃, and the time is controlled in 15-20 minutes; Continue to add the photoinitiator, slowly add the fluorosilicon synergistic core-shell particles prepared in step S1, carry out wet grinding in a closed sand mill, then sequentially add polytetrafluoroethylene wax with an average particle size of 3μm and a leveling agent, and continue to disperse using a high-speed dispersion device with a rotation speed of 2000rpm for 60 minutes; After the mixing of the coating system is completed, the high-performance coating precursor with balanced viscosity and stable structure is obtained after vacuum degassing treatment.

[0016] The application of a high-wear-resistant coating for automobile ornaments is based on the high-wear-resistant coating for automobile ornaments described above, and includes the following process: Surface activation treatment of the automobile ornament substrate; Use an electrostatic spray gun to spray the coating precursor; After spraying, perform curing treatment.

[0017] Further optimization of the technical solution, the curing treatment after spraying includes: After spraying, the automobile ornament is first placed in a 50-60℃ oven for preliminary heat preheating, and the time is 10 minutes; then pre-curing treatment is carried out using a 365nm wavelength ultraviolet lamp, and the irradiation energy is 400-800mJ / cm², forming a preliminary film structure; Post-treatment is carried out using a stepwise thermal curing process, i.e., sequentially performing heat treatment processes with conditions of 60℃ / 10min→ conditions of 80℃ / 20min→ conditions of 100℃ / 10min, and finally obtaining the coating of the automobile ornament.

[0018] Compared with the prior art, the present application provides a high-wear-resistant coating for automobile ornaments, a preparation method and application, which have the following beneficial effects: The high-wear-resistant coating for automobile ornaments, the preparation method and the application significantly improve the wear resistance and dispersion stability of the coating by constructing a fluorosilicon synergistic core-shell structure with gamma-alumina nanorods as the core and fluorine-containing polymers as the shell; the low-surface-energy film-forming system is constructed using fluorine-modified polycarbonate resin to improve the resistance to sweat and ethanol corrosion; and the UV-thermal synergistic curing process is introduced to reduce the film thickness and energy consumption while achieving efficient and rapid curing and excellent surface quality. The overall system is superior to the prior art in terms of wear resistance, chemical resistance, energy consumption control and workability, and has significant comprehensive performance improvement and wide industrial application value. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0020] Figure 1 A schematic diagram of a composition part of the high wear-resistant coating for automobile ornaments proposed by the present application is shown in the figure. Figure 2 A flowchart of the preparation method of the high wear-resistant coating for automobile ornaments proposed by the present application is shown in the figure. Figure 3 A flowchart of the application of the high wear-resistant coating for automobile ornaments proposed by the present application is shown in the figure. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0022] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from the description, and those skilled in the art can make similar generalizations without departing from the concept of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0023] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor does it mean an embodiment that is independent of or mutually exclusive with other embodiments.

[0024] Embodiment one: Reference Figure 1 For the first embodiment of the present application, the embodiment provides a high wear-resistant coating for automobile ornaments, which comprises the following components in mass fraction: Fluorine-modified polycarbonate resin: 100 parts; Fluorosilicon synergistic core-shell particles: 10 parts; Photoinitiator: 3 parts; Active diluent: 20 parts; Polytetrafluoroethylene wax: 5 parts; Leveling agent: 0.9 parts.

[0025] The fluorine-modified polycarbonate resin is composed of a polycarbonate molecular chain grafted with a fluorine-containing functional group, the fluorine-containing functional group is a fluoroalkyl group, the grafted fluorine content is 12wt%, a stable low surface energy molecular skeleton is constructed through a carbon-fluorine bond structure, and excellent hydrophobicity and anti-pollution performance are achieved. The glass transition temperature of the fluorine-modified polycarbonate resin is 80-120℃, the elongation at break is >80%, and a dense crosslinked network structure is formed under UV-thermal synergistic curing conditions with other components, and flexibility and mechanical strength are combined.

[0026] The fluorosilicon synergistic core-shell particle is used as a wear-resistant reinforcing phase, the core layer is a γ-alumina nanorod, has a specific surface area ≥180m² / g and a space orientation structure with a length-diameter ratio ≥3:1, can provide excellent rigid skeleton and shear resistance; the shell layer is composed of a copolymer of trifluoroethyl methacrylate and polyurethane acrylate, the grafting rate is not less than 85%, and the shell layer thickness is controlled between 10-20nm, and the nanometer core particle is stably coated by a chemical bond. The overall surface energy of the particle is controlled to ≤25mN / m, a sub-nanometer dispersion state is achieved, the interfacial bonding force is enhanced and long-term dispersion stability is maintained. The core-shell particle has anti-agglomeration and energy response capacity, can effectively disperse impact stress, and improve the wear resistance and structural integrity of the coating.

[0027] The photoinitiator is TPO-L, which is an acyloxy phosphine oxide compound with high ultraviolet light absorption efficiency, and has a maximum absorption wavelength of 380nm and can release high-efficiency radicals at a wavelength of 365±10nm. The initiator has a high reaction rate at a set UV energy density (400-800mJ / cm²), has good light transmittance and system compatibility, avoids the problem that the surface curing rate is faster than the internal rate and causes stress cracking; cooperates the light curing reaction with the thermal curing process, enhances the denseness of the curing network, reduces residual monomers, and improves the aging resistance of the coating.

[0028] The leveling agent is an organic silicon-modified acrylate polymer BYK-333, which has a dynamic surface tension of 28mN / m, is used to quickly spread on the surface of the coating, effectively inhibits shrinkage holes and fisheye defects caused by surface tension gradients during construction, has good surface flowability regulation ability, avoids orange peel or uneven light reflection phenomena caused by particle agglomeration and uneven coating curing, and the siloxane segment in the molecular structure of BYK-333 gives it excellent compatibility and surface migration ability, which can automatically gather on the surface layer of the coating during the curing stage, and improve the appearance and hand feeling.

[0029] The active diluent is 1,6-hexanediol diacrylate HDDA, which is a linear difunctional monomer with a viscosity of 1500 cP at 25℃. The introduction of HDDA not only reduces the overall construction viscosity of the system, improves the sprayability and leveling property, but also provides uniform reaction point distribution in UV-thermal composite curing, improves network integrity; can realize the balance between the flexibility adjustment and hardness enhancement of the film structure, and avoid the deterioration problem of the increase of the brittleness of the pure fluorine resin system.

[0030] The polytetrafluoroethylene wax PTFE is a polytetrafluoroethylene particle after micronization treatment, with an average particle size of 3 μm, extremely low surface energy and excellent chemical resistance; in the coating system, it is in a particulate dispersion state, and can form a micro low friction structure on the surface of the film layer, thereby significantly reducing the surface friction coefficient and improving the scratch resistance and smoothness; in addition, the PTFE powder has excellent solvent resistance and thermal stability, and is not easy to migrate and whitening during long-term use of the coating, and has good stability.

[0031] Example two: Reference Figures 2-3 , this embodiment provides a preparation method of a high wear-resistant coating for automobile trim parts, which is prepared based on the high wear-resistant coating for automobile trim parts in embodiment one, and includes the following specific steps: S1, preparation of fluorosilicon synergistic core-shell particles.

[0032] The γ-alumina nanorods are vacuum dried at 120℃ for not less than 6 hours to remove the surface adsorbed water and impurities.

[0033] The obtained dried γ-alumina nanorods are dispersed in a KH-570 silane coupling agent ethanol solution, and magnetically stirred at room temperature for 60 minutes; the coupling agent is fully adsorbed and reacted on the surface of the nanometer alumina, thereby improving the surface activity and subsequent grafting compatibility.

[0034] Under the condition of continuously introducing nitrogen protection atmosphere, the shell monomer system pre-mixed by trifluoroethyl methacrylate and polyurethane acrylate at a mass ratio of 3:2 is added dropwise at 80℃, a peroxide initiator (such as BPO or AIBN) is added for free radical initiation polymerization, the reaction time is controlled to be 4 hours, the grafting rate of the shell is not less than 85%, and finally the fluorosilicon synergistic core-shell structure with a shell thickness of 10-20 nm is obtained.

[0035] After polymerization, ethanol washing, centrifugal separation three times, and drying, the fluorosilicon synergistic core-shell particles with good dispersibility are obtained, with a specific surface area of not less than 180 m² / g, which is suitable for direct addition to the coating system.

[0036] S2, construction and stable dispersion of coating precursor.

[0037] The fluorine-modified polycarbonate resin and the active diluent are added to a stirring reaction kettle, and pre-mixed at a low speed under the condition of 25±2℃ for 15-20 minutes to ensure good compatibility and form a uniform solution system.

[0038] The photoinitiator, which is a phosphine oxide type photosensitive material with a maximum absorption wavelength of 380 nm, is continuously added to activate the free radical reaction under a 365±10 nm light source. The fluorosilicon synergistic core-shell particles prepared in step S1 are slowly added and wet ground in a closed sand mill until the particle size distribution in the system is controlled to be less than 100 nm to ensure the nanometer uniform dispersion of the reinforcing phase. Then, polytetrafluoroethylene wax with an average particle size of 3 μm and a leveling agent are sequentially added, and a high-speed dispersion device with a rotation speed of 2000 rpm is used for continuous dispersion for 60 minutes.

[0039] After the mixing of the coating system is completed, the system is vacuum degassed to obtain a high-performance coating precursor with balanced viscosity and stable structure.

[0040] Subsequently, the high-wear-resistant coating for automobile trim parts is applied, including the following process: Surface activation treatment of automobile trim part substrates; The ABS or PC+ABS automobile trim part substrates are subjected to surface activation treatment, preferably using plasma treatment technology to improve the surface polarity and coating adhesion performance.

[0041] The electrostatic spray gun is used to apply the coating precursor; The treated substrate is applied using an electrostatic spray gun, and the coating wet film thickness is controlled to be 35±3 μm to ensure uniform coverage and no sagging.

[0042] After spraying, the curing treatment is performed; After spraying, the automobile trim part is first placed in an oven at 50-60℃ for preliminary heat preheating for 10 minutes to release the solvent and activate part of the thermal reaction groups in the resin; then, a 365 nm wavelength ultraviolet lamp is used for pre-curing treatment, and the irradiation energy is 400-800 mJ / cm² to generate free radicals rapidly, initiate polymerization and crosslinking reaction, and form a preliminary film structure; The stepwise thermal curing process is used for post-treatment, i.e., the heat treatment processes of 60℃ / 10min→80℃ / 20min→100℃ / 10min are sequentially performed, and finally the coating of the automobile trim part is obtained.

[0043] The coating can be applied to automobile accessories such as automobile touch screen surfaces, gear lever handles, and window control buttons.

[0044] At the same time, the performance of the applied coating is tested using the test items shown in Table 1.

[0045] Based on the above test items, the automobile ornament high wear-resistant coating provided by the application can effectively solve the technical problems of poor wear resistance, insufficient chemical corrosion resistance, high energy consumption cost and unstable dispersion of nanoparticles in the existing automobile coating system, and has the following remarkable beneficial effects: Significantly improve the wear resistance: by introducing the structure ordered gamma-alumina nanorod, cooperating with the high grafting rate (≥85%) fluorine-containing polymer shell layer to build fluorine-silicon synergistic core-shell particles, a micro-scale rigid support network is formed in the coating, which significantly reduces the wear. After Taber abrasion test (CS-10 wheel, 1kg load), the wear amount is ≤15mg / 1000 turns, which is much better than the traditional PU / acrylic coating (>50mg / 1000 turns), and can realize long-term scratch resistance and contact damage resistance.

[0046] Strengthen the chemical corrosion resistance: the main film-forming material uses fluorine-modified polycarbonate resin, the fluorine content is 12wt%, and the core-shell particle with a surface energy of ≤25mN / m is used to build an ultra-hydrophobic micro-surface structure, which significantly inhibits the penetration of corrosive media such as sweat and alcohol. The coating can resist pH=4.5 artificial sweat immersion for 240h without obvious light loss, and can be wiped with ethanol 1500 times under 500g load without swelling.

[0047] Reduce energy consumption and simplify process flow: the application adopts UV-thermal synergistic curing technology, discards the traditional 3-coating 2-baking (bottom, middle, surface three layers) process, and only needs single-coating single-curing process to realize the integration of coating functions. Control the total film thickness to 35±3μm, reduce the material consumption and equipment running time under the premise of ensuring the performance, the overall energy consumption is reduced by more than 30%, which has significant energy saving and cost reduction advantages.

[0048] Example three: In order to adapt to different application environments and needs, the following several implementable design schemes are proposed in this embodiment: Implementation scheme 1: basic type Fluorine-silicon synergistic core-shell particles: the diameter of Al2O3 core is 50nm, and the fluorine content in the shell layer is 18wt%; Curing process: UV 600mJ / cm² + 80℃ / 30min; Performance: Taber abrasion value 12mg, pencil hardness 3H.

[0049] Implementation scheme 2: high light transmission type The core material is replaced by nano-SiO2 (diameter 20nm, refractive index 1.46); Add 0.3% nano cerium tungsten composite anti-UV agent; Transmittance > 92% (ASTM D1003).

[0050] Embodiment 3: Conductive type Core-shell particles incorporated 15% ITO nanowires (length 10 pm, diameter 50 nm); Surface resistance: 10 4 Ω / sq (satisfy the anti-static requirements of touch screen).

[0051] Embodiment 4: Self-repairing type Add 5% microencapsulated repair agent (shell: melamine formaldehyde resin; core material: hydrogenated bisphenol A epoxy); Scratch repair rate: 60°C / 10min repair depth ≤5 pm scratch (repair rate >90%).

[0052] Embodiment 5: High flexibility Mix 20% hydroxyl fluorine rubber in the resin matrix; Bending performance: pass Φ2mm 180° bending (ISO 1519).

[0053] Embodiment 6: Metal effect Add 8% flaky aluminum powder (aspect ratio 50:1, D50=15 pm); Metallic feel: ΔE <0.5 (60° gloss 110 GU); Embodiment 7: Antibacterial type Core-shell particles loaded with silver (Ag content 2wt%); Antibacterial rate: >99.9% (ISO 22196).

[0054] Embodiment 8: High temperature resistant type Resin replaced with fluorine polyaromatic ether ketone containing benzene ring; Heat resistance: no yellowing at 180°C / 1000h (ΔE <1).

[0055] Change design scheme: In order to adapt to different application environments and needs, the present application proposes the following several possible change design schemes: Transformation scheme 1 (water-based system) Solvent type resin → water-based fluorocarbon dispersion (solid content 40%); Curing agent: water-based HDI trimer (NCO%=12.5); VOC: 28g / L (far lower than the national standard limit of 80g / L).

[0056] Transformation scheme 2 (fast curing) Cancel heat curing, using double light initiation system (TPO-L+819, dose 1200 mJ / cm2); Suitable substrate: poor heat resistance TPU / PC plastic.

[0057] Deformation scheme 3 (low-cost type) Fluorosilicon synergistic core-shell particles are replaced with stearic acid modified CaCO3 nanoparticles (cost reduced by 50%); Sacrifice performance: Taber wear increased to 25 mg, ethanol resistance decreased to 800 times.

[0058] Deformation scheme 4 (high wear resistance enhancement) Addition of oriented arrangement of silicon carbide whiskers (diameter 0.5 μm, length 20 μm, addition amount 5%); Extreme wear resistance: Taber wear value ≤8 mg / 1000 turns.

[0059] It should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A high wear-resistant coating for automobile accessories, characterized in that: The components include the following in parts by mass: Fluorine-modified polycarbonate resin: 100 parts; Fluorosilicone synergistic core-shell particles: 8-12 parts; Photoinitiator: 2-3 parts; Active diluent: 15-20 parts; Polytetrafluoroethylene wax: 3-5 parts; Leveling agent: 0.7-0.9 parts.

2. The high wear-resistant coating for automobile accessories according to claim 1, characterized in that: The fluorine-modified polycarbonate resin is composed of a polycarbonate molecular chain grafted with a fluorine-containing functional group, wherein the fluorine-containing functional group is a fluoroalkyl group, the grafted fluorine content is 12 wt%, and a stable low-surface-energy molecular skeleton is constructed through a carbon-fluorine bond structure.

3. The high wear-resistant coating for automobile accessories according to claim 1, characterized in that: The fluorosilicone synergistic core-shell particles serve as a wear-resistant reinforcing phase, and their core layer is γ-alumina nanorods with a spatially oriented structure with a specific surface area of ​​≥180m² / g and an aspect ratio of ≥3:1; their shell layer is composed of a copolymer of trifluoroethyl methacrylate and polyurethane acrylate, with a grafting rate of not less than 85%, and a shell thickness controlled between 10-20nm, and the nano-core particles are stably coated by chemical bonds.

4. The high wear-resistant coating for automobile accessories according to claim 1, characterized in that: The photoinitiator is TPO-L, which is an acyloxyphosphine oxide compound with a maximum absorption wavelength at 380 nm and high-efficiency free radical release at a wavelength of 365±10 nm; The leveling agent is silicone-modified acrylic polymer BYK-333, which has a dynamic surface tension of 28 mN / m and is used to quickly spread on the coating surface.

5. The high wear-resistant coating for automobile accessories according to claim 1, characterized in that: The active diluent is 1,6-hexanediol diacrylate HDDA, which is a linear difunctional monomer with a viscosity of 1500 cP at 25°C; The polytetrafluoroethylene wax is micronized polytetrafluoroethylene particles with an average particle size of 3 μm. It is in a microparticle dispersion state in the coating system and forms a microscopic low-friction structure on the surface of the film layer.

6. A method for preparing a high wear-resistant coating for automobile accessories, which is prepared based on the high wear-resistant coating for automobile accessories according to any one of claims 1 to 5, characterized in that: The specific steps include: S1, preparation of fluorosilicone synergistic core-shell particles; S2. Construction and stable dispersion of coating precursors.

7. The method for preparing a highly wear-resistant coating for automobile accessories according to claim 6, characterized in that: In the step S1, the γ-alumina nanorods are vacuum dried at 120° C. to remove surface adsorbed moisture and impurities; The dried γ-alumina nanorods were dispersed in an anhydrous ethanol solution of KH-570 silane coupling agent and magnetically stirred at room temperature for 60 minutes. Under a nitrogen protective atmosphere, a shell monomer system premixed with trifluoroethyl methacrylate and polyurethane acrylate in a mass ratio of 3:2 was added dropwise at 80°C, and a peroxide initiator was added to carry out free radical polymerization. The reaction time was controlled to be 4 hours, and finally a fluorosilicone synergistic core-shell structure with a shell thickness of 10-20 nm was obtained. After the polymerization, the particles were washed with ethanol, centrifuged three times, and dried to obtain fluorosilicone synergistic core-shell particles with good dispersion.

8. The method for preparing a highly wear-resistant coating for automobile accessories according to claim 6, characterized in that: In step S2, the fluorine-modified polycarbonate resin and the reactive diluent are added to a stirred reactor and pre-mixed by low-speed stirring at 25±2° C. for 15-20 minutes; Continue adding the photoinitiator, slowly add the fluorosilicone synergistic core-shell particles prepared in step S1, and wet grind them in a closed sand mill. Then, add polytetrafluoroethylene wax with an average particle size of 3 μm and a leveling agent in sequence, and continue dispersing for 60 minutes using a high-speed dispersing device at a speed of 2000 rpm; After the mixed coating system is subjected to vacuum degassing treatment, a high-performance coating precursor with balanced viscosity and stable structure is obtained.

9. An application of a high wear-resistant coating for automobile accessories, based on the application of the high wear-resistant coating for automobile accessories according to any one of claims 1 to 8, characterized in that: The following processes are included: Surface activation treatment of automotive trim substrates; Use electrostatic spray gun for construction to spray paint precursor; After spraying, it is cured.

10. The use of a high wear-resistant coating for automobile accessories according to claim 9, characterized in that: The curing treatment after spraying includes: After spraying, the automotive trim is first preheated in a 50-60°C oven for 10 minutes. Then, a 365nm wavelength UV lamp is used for pre-curing with an irradiation energy of 400-800mJ / cm² to form a preliminary film structure. A step-by-step thermal curing process is used for post-treatment, that is, a heat treatment process is carried out in sequence at 60°C / 10 min → 80°C / 20 min → 100°C / 10 min, and finally a coating for automotive accessories is obtained.

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