Real wood waterborne high gloss paint, preparation method thereof and preparation method of automobile real wood interior part

Abstract

The present disclosure provides a kind of real wood water-based high gloss paint and its preparation method, the preparation method of automobile real wood interior parts, the real wood water-based high gloss paint includes A component and B component, the A component includes the following each mass component: water-based acrylic resin 50-65 parts;Water-based polyurethane acrylic resin 25-35 parts;Water-based fluorocarbon emulsion 3-10 parts;Surface additive 0.5-2 parts;Film forming additive 3.0-5.0 parts;B component is isocyanate curing agent, the mass ratio of A component and isocyanate curing agent is 1:1 to 3:1.The real wood water-based high gloss paint is sprayed on real wood base piece, and pre-curing is carried out after baking, and then UV curing is carried out, and the obtained automobile real wood interior part.The real wood water-based high gloss paint forms hydroxypropyl-polyurethane-fluorocarbon triple crosslinking network, improves the adhesion of coating, alcohol resistance and weather resistance;The coating pre-curing temperature of real wood water-based high gloss paint is lower, avoids real wood base piece high temperature deformation.

Description

Technical Field

[0001] This disclosure relates to the technical field of coatings, and in particular to a water-based high-gloss coating for real wood and its preparation method, as well as a method for preparing real wood interior parts for automobiles. Background Technology

[0002] The new energy vehicle industry is developing rapidly, but solvent-based coatings are still widely used in the manufacturing of automotive interior and exterior parts. This is significantly at odds with the life-cycle environmental protection concept emphasized by new energy vehicles (such as EU REACH and Chinese GB 24409 regulations). The life-cycle environmental protection concept requires a systematic assessment of the environmental impact of the entire chain, from raw material mining, parts manufacturing, vehicle assembly, vehicle use to final scrapping and recycling. Its core lies in breaking the one-sided perception that "electric vehicles only have zero emissions during the use stage" and reducing the carbon footprint and pollution of each link through systematic optimization.

[0003] Against this backdrop, the emission reduction contribution of the interior manufacturing process is particularly crucial. Battery production can account for over 40% of the carbon footprint of a vehicle, amplifying the relative emission reduction benefits of automotive interior and exterior component production. Replacing solvent-based coatings with water-based coatings can reduce CO2 equivalent emissions by approximately 8 kg per kilogram, demonstrating a significant emission reduction effect. Furthermore, as people's living standards improve, their demands for the environmental performance and comprehensive physicochemical properties of automotive interior and exterior coatings are increasing. In particular, high-end models' genuine wood interior components require ceramic-like high gloss and resistance to acid and alkali corrosion, posing greater challenges to water-based high-gloss coatings. Breakthroughs are urgently needed in the adhesion, weather resistance, and high-temperature and high-humidity resistance of water-based high-gloss coatings applied to genuine wood surfaces. Summary of the Invention

[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a water-based high-gloss coating for real wood with high adhesion and good weather resistance, as well as a method for preparing the same and a method for preparing real wood interior parts for automobiles.

[0005] The purpose of this disclosure is achieved through the following technical solution:

[0006] A water-based high-gloss coating for natural wood, comprising component A and component B, wherein component A comprises the following components by weight:

[0007] 50-65 parts of water-based acrylic resin;

[0008] 25-35 parts of waterborne polyurethane acrylic resin;

[0009] 3-10 parts of water-based fluorocarbon emulsion;

[0010] Surface additives: 0.5-2 parts;

[0011] Film-forming aid 3.0-5.0 parts;

[0012] Component B is an isocyanate curing agent, and the mass ratio of component A to the isocyanate curing agent is 1:1 to 3:1.

[0013] In one embodiment, the waterborne polyurethane acrylate resin is a self-initiating waterborne polyurethane acrylate.

[0014] In one embodiment, the film-forming aid is at least one of propylene glycol methyl ether, ethylene glycol butyl ether, and dipropylene glycol butyl ether.

[0015] In one embodiment, the hydroxyl value of the aqueous acrylic resin ranges from 35 mg / KOH to 180 mg / KOH.

[0016] In one embodiment, the gloss of the real wood water-based high-gloss coating is ≥95°.

[0017] In one embodiment, the viscosity of the aqueous acrylic resin is less than 3000 mPa·s.

[0018] A method for preparing a water-based high-gloss coating for real wood, used to prepare the water-based high-gloss coating for real wood as described in any of the above embodiments, includes the following steps:

[0019] Waterborne acrylic resin, waterborne polyurethane acrylic resin, waterborne fluorocarbon emulsion, surface additives and film-forming aids are added sequentially and mixed and dispersed at a dispersion speed of 200 r / min-400 r / min.

[0020] The dispersion speed is then increased to 600 r / min-800 r / min, and the dispersion time is 40 min-60 min to obtain component A;

[0021] Component A is mixed and stirred evenly with isocyanate curing agent to obtain high-gloss paint finish automotive wood interior parts.

[0022] A method for preparing genuine wood interior trim for automobiles, comprising the following steps: The genuine wood water-based high-gloss coating is prepared using any of the above embodiments.

[0023] The water-based high-gloss coating for real wood is sprayed onto a real wood substrate to obtain a sprayed interior part.

[0024] The sprayed interior trim is pre-cured by baking at a temperature of 78℃-82℃ for 60-90 minutes to obtain pre-cured interior trim.

[0025] The pre-cured interior trim is UV cured to obtain a high-gloss paint finish interior trim.

[0026] In one embodiment, the water-based high-gloss coating for real wood is cured on the real wood substrate with a coating thickness of 30μm-35μm.

[0027] In one embodiment, the moisture content of the real wood substrate is 6%-8%.

[0028] Compared with the prior art, this disclosure has at least the following advantages:

[0029] The aforementioned water-based high-gloss wood coating utilizes the cross-linking of hydroxyl groups in water-based acrylic resin with isocyanate curing agent. Water-based acrylic resin serves as the primary film-forming substance, providing the coating with basic hardness, gloss, weather resistance, and adhesion. UV-cured cross-linking of water-based polyurethane acrylic resin increases the coating's adhesion and hardness, thereby improving its alcohol and acid / alkali resistance. The fluorocarbon resin in the water-based fluorocarbon emulsion enhances weather resistance, reduces yellowing of the water-based high-gloss wood coating, and improves the overall hydrophobicity of the film, preventing moisture from contacting the wood and reducing the risk of deformation and cracking. Through the compounding of water-based acrylic resin, polyurethane acrylic resin, and fluorocarbon resin, the water-based high-gloss wood coating forms a triple cross-linked network of "hydroxypropyl-polyurethane-fluorocarbon," resulting in better adhesion between the coating and the wood surface, thus improving the coating's adhesion, alcohol resistance, and weather resistance.

[0030] The preparation method of automotive wood interior parts involves a low pre-curing temperature for spraying a water-based high-gloss wood coating to avoid high-temperature deformation of the wood substrate. The coating is then UV-cured, resulting in good adhesion between the high-gloss paint and the wood substrate. The high gloss and excellent adhesion of the acrylic resin in the water-based high-gloss coating, the high hardness and chemical resistance of the self-initiating waterborne polyurethane acrylate, and the good weather resistance of the fluorocarbon resin all contribute to the excellent weather resistance, acid and alkali resistance, and ceramic-like high gloss of the automotive wood interior parts coated with this water-based high-gloss paint. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A flowchart illustrating the steps of a method for preparing a water-based high-gloss coating for real wood, according to one embodiment;

[0033] Figure 2A flowchart illustrating the steps of a method for preparing automotive wood interior trim parts according to an embodiment;

[0034] Figure 3 This is a rendering of the surface coating effect of a genuine wood interior trim piece for automobiles, according to one embodiment. Detailed Implementation

[0035] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0039] A water-based high-gloss coating for natural wood, according to an embodiment of the present invention, comprises component A and component B, wherein component A comprises the following components by weight:

[0040] 50-65 parts of water-based acrylic resin;

[0041] 25-35 parts of waterborne polyurethane acrylic resin;

[0042] 3-10 parts of water-based fluorocarbon emulsion;

[0043] Surface additives: 0.5-2 parts;

[0044] Film-forming aid 3.0-5.0 parts;

[0045] Component B is an isocyanate curing agent, and the mass ratio of component A to the isocyanate curing agent is 1:1 to 3:1.

[0046] In this embodiment, surface components are used to improve wettability and reduce pinholes; film-forming aids are used to lower the film-forming temperature; waterborne acrylic resin is the main film-forming substance, providing basic hardness, gloss, weather resistance, and film-forming properties. The hydroxypropyl groups of the waterborne acrylic resin and the isocyanate curing agent are thermo-cured by heating, allowing the acrylic resin to quickly cure and form on the surface of the real wood. The waterborne acrylic resin molecules contain hydrophilic groups such as hydroxyl and carboxylic acid groups, which can interact with water-soluble waterborne components in the wood, resulting in strong permeability of the waterborne acrylic resin molecules into the pores of the real wood; waterborne polyurethane acrylic resin forms a high-density structure after UV curing, and the waterborne polyurethane acrylic resin can increase... The coating exhibits improved adhesion and hardness, maintaining film integrity and thus enhancing its resistance to alcohol and acids / alkalis. The highly electronegative fluorine atoms of fluorocarbon resin form high-energy covalent bonds with carbon atoms, making it difficult for fluorocarbon resin to undergo bond-breaking reactions under environmental factors such as ultraviolet radiation and ozone. This blocks the aging path of the material at the molecular level. The fluorocarbon resin in water-based fluorocarbon emulsions improves the weather resistance of the water-based high-gloss wood coating. The triple cross-linking of water-based acrylic resin, polyurethane acrylic resin, and fluorocarbon resin allows the coating film to adapt to the shrinkage and expansion of real wood, resulting in high adhesion, good alcohol resistance, and excellent weather resistance.

[0047] Understandably, the fluorocarbon resin in water-based fluorocarbon emulsions possesses extremely low surface energy and excellent water resistance, chemical resistance, and stain resistance. Adding fluorocarbon resin also improves the overall hydrophobicity of the coating film, allowing it to more effectively block direct and rapid contact between liquid water and ambient moisture and the surface of the real wood. This slows down the rate of moisture absorption and desorption by the wood, resulting in a more gradual change in the moisture content of the real wood when ambient humidity changes. Consequently, the dimensional changes of the real wood are reduced, improving dimensional stability and minimizing the risk of deformation and cracking.

[0048] The aforementioned water-based high-gloss wood coating utilizes the cross-linking of hydroxyl groups in water-based acrylic resin with isocyanate curing agent. Water-based acrylic resin serves as the primary film-forming substance, providing the coating with basic hardness, gloss, weather resistance, and adhesion. UV-cured cross-linking of water-based polyurethane acrylic resin increases the coating's adhesion and hardness, thereby improving its alcohol and acid / alkali resistance. The fluorocarbon resin in the water-based fluorocarbon emulsion enhances weather resistance, reduces yellowing of the water-based high-gloss wood coating, and improves the overall hydrophobicity of the film, preventing moisture from contacting the wood and reducing the risk of deformation and cracking. Through the compounding of water-based acrylic resin, polyurethane acrylic resin, and fluorocarbon resin, the water-based high-gloss wood coating forms a triple cross-linked network of "hydroxypropyl-polyurethane-fluorocarbon," resulting in better adhesion between the coating and the wood surface, thus improving the coating's adhesion, alcohol resistance, and weather resistance.

[0049] In one embodiment, the waterborne polyurethane acrylate resin is a self-initiating waterborne polyurethane acrylate. In this embodiment, the self-initiating waterborne polyurethane acrylate has built-in initiating groups, and the resin molecular chain is directly connected to initiating groups such as peroxy (-OO-), azo (-N=N-), or thiol groups, achieving a flow rate greater than 300 mJ / cm². 2 UV energy is sufficient for curing; self-initiating waterborne polyurethane acrylate is a single component that can be used directly, simplifying the production process. At the same time, no initiator needs to be added, avoiding yellowing caused by initiator residues, thereby improving the weather resistance of real wood waterborne high-gloss coatings.

[0050] In one embodiment, the film-forming aid is at least one selected from propylene glycol methyl ether, ethylene glycol butyl ether, and dipropylene glycol butyl ether. In this embodiment, the film-forming aid can lower the minimum film-forming temperature of the waterborne resin, allowing the resin to form a continuous coating film under low-temperature or rapid drying conditions.

[0051] In one embodiment, the hydroxyl value of the waterborne acrylic resin ranges from 35 mg / KOH to 180 mg / KOH. In this embodiment, when the hydroxyl value of the waterborne acrylic resin is greater than 180 mg / KOH, the crosslinking density of the coating film is high, and the resin becomes brittle after curing, affecting the resin's flexibility and adhesion. When the hydroxyl value of the waterborne acrylic resin is less than 35 mg / KOH, the crosslinking density of the coating film is low after curing, resulting in low gloss and poor hydrolysis and chemical resistance.

[0052] In one embodiment, the gloss of the water-based high-gloss wood coating is ≥95°. In this embodiment, the high gloss and transparency are provided by the high emulsion content and the main resins water-based acrylic resin, water-based polyurethane acrylic resin, and water-based fluorocarbon emulsion, thereby resulting in good wood grain transparency of the water-based high-gloss wood coating.

[0053] In one embodiment, the surface aid is an organosilicon surface aid. In this embodiment, the organosilicon surface aid is suitable for solvent-free, solvent-based, and aqueous systems, has a wide range of applications, and can significantly reduce surface tension; specifically, the organosilicon surface aid is polyether-modified polydimethylsiloxane.

[0054] In one embodiment, the viscosity of the waterborne acrylic resin is less than 3000 mPa·s. In this embodiment, the high viscosity of the waterborne acrylic resin affects the leveling performance of the real wood waterborne high-gloss coating. The low viscosity of the waterborne acrylic resin can reduce the atomization resistance during spraying, thereby reducing surface defects such as orange peel and pinholes.

[0055] Furthermore, the solvent for the isocyanate curing agent is propylene glycol diacetate or propylene glycol methyl ether acetate. In this embodiment, propylene glycol diacetate has good compatibility with acrylic resins and polyester resins, while propylene glycol methyl ether acetate has stronger solubility for non-polar substances and higher compatibility with epoxy resins and polyurethane resins. Specifically, the solvent for the isocyanate curing agent BURNOCK DNW-5502 is propylene glycol diacetate, and the solvent for the isocyanate curing agent BURNOCK DNW-5500-ZS is propylene glycol methyl ether acetate. Selecting a suitable curing agent can ensure that the water-based high-gloss coating forms a stable cross-linked structure during the curing process, thereby improving the durability and stability of the water-based high-gloss coating.

[0056] This application also provides a method for preparing a water-based high-gloss coating for real wood, used to prepare the water-based high-gloss coating for real wood as described in any of the above embodiments, comprising the following steps:

[0057] S101 is added sequentially to waterborne acrylic resin, waterborne polyurethane acrylic resin, waterborne fluorocarbon emulsion, surface additives and film-forming aids and mixed and dispersed at a dispersion speed of 200 r / min-400 r / min;

[0058] S103 further increases the dispersion speed to 600 r / min-800 r / min and the dispersion time to 40 min-60 min to obtain component A;

[0059] S105 Component A is mixed and stirred evenly with the isocyanate curing agent to obtain a water-based high-gloss wood coating. In this embodiment, the water-based acrylic resin, water-based polyurethane acrylic resin, and water-based fluorocarbon emulsion are all low-viscosity water-based emulsions, which allows for rapid and uniform mixing of the water-based acrylic resin, water-based polyurethane acrylic resin, water-based fluorocarbon emulsion, and surface additives. The production process is simple, and the quality of the water-based high-gloss wood coating is easy to control. After adding the isocyanate curing agent, the water-based high-gloss wood coating needs to be used quickly to avoid gelation.

[0060] This application also provides a method for preparing genuine wood interior trim for automobiles, which uses a genuine wood water-based high-gloss coating prepared in any of the above embodiments for manufacturing, and includes the following steps:

[0061] S201 The real wood water-based high-gloss coating is sprayed onto a real wood substrate to obtain a sprayed interior part;

[0062] S203 pre-cures the sprayed interior trim by baking at a pre-curing temperature of 78℃-82℃ for 60min-90min to obtain pre-cured interior trim.

[0063] S205 performs UV curing on the pre-cured interior trim to obtain high-gloss paint finish automotive wood interior trim.

[0064] The above-mentioned method for preparing automotive wood interior parts involves a low pre-curing temperature for the water-based high-gloss wood coating to prevent high-temperature deformation of the wood substrate. The coating is then UV-cured to ensure good adhesion between the coating and the wood substrate. The acrylic resin in the water-based high-gloss wood coating provides high gloss and excellent adhesion, the self-initiating waterborne polyurethane acrylate provides high hardness and chemical resistance, and the fluorocarbon resin provides good weather resistance. This results in automotive wood interior parts coated with the water-based high-gloss wood coating exhibiting good weather resistance, good acid and alkali resistance, and a ceramic-like high gloss.

[0065] In one embodiment, the thickness of the water-based high-gloss wood coating cured on the real wood substrate is 30μm-35μm. In this embodiment, the coating of the water-based high-gloss wood coating is relatively thin, resulting in better light transmittance and better wood grain visibility. The natural texture of the real wood substrate is clearly displayed, and the coating also provides good protection, stain resistance, and high gloss.

[0066] In one embodiment, the UV curing energy is 400 mJ / cm². 2 -600mj / cm 2 In this embodiment, the self-initiating waterborne polyurethane acrylate UV energy in the real wood waterborne high-gloss coating is greater than 300 mJ / cm². 2 Curing can then be achieved, with UV curing energy exceeding 400 mJ / cm². 2 This shortens curing time and improves production efficiency; the UV curing energy is less than 600 mJ / cm². 2 The curing energy is relatively low, avoiding the yellowing problem that occurs when the UV curing energy is too high.

[0067] In one embodiment, the real wood substrate is made of oak or walnut. In this embodiment, oak has high hardness and good wear resistance, and its grain is a radial "tiger skin" pattern; walnut has high density and hardness, high compressive strength, straight or wavy grain, and a strong luster; the real wood substrate enhances the quality of the automotive interior by combining the aesthetic appeal and environmental friendliness of different real wood materials.

[0068] In one embodiment, the moisture content of the real wood substrate is 6%-8%. In this embodiment, the temperature of the real wood substrate inside the car is high when exposed to the sun in summer, and low when the air conditioning is on, resulting in a large temperature difference between hot and cold cycles. This leads to a greater shrinkage rate and greater dimensional changes during drying or temperature changes, increasing the risk of cracking. It is understood that the lower the moisture content of the real wood substrate, the less shrinkage it undergoes. Moisture content is a core indicator of wood stability, directly affecting its dimensional changes, mechanical strength, and coating adhesion. Controlling the moisture content at 6%-8% significantly reduces the expansion and contraction of wood caused by temperature and humidity changes, avoids stress concentration in the water-based high-gloss coating caused by wood deformation, reduces the risk of cracking, and ensures the dimensional stability of the real wood substrate. This eliminates the need for excessive compensation flow in the spraying process, thereby improving the coating pass rate.

[0069] Furthermore, before spraying the real wood water-based high-gloss coating onto the real wood substrate to obtain the sprayed interior trim, the real wood substrate is subjected to gradient drying, including the following steps;

[0070] The real wood substrate is subjected to low-temperature dehumidification for 12-24 hours, with the temperature raised to 35-40℃ and the humidity reduced to 30%-35%.

[0071] The real wood substrate is subjected to medium-temperature drying for 24-36 hours, with the temperature raised to 45-50℃ and the humidity adjusted to 20%-25%.

[0072] The real wood substrate is subjected to high-temperature shaping for 12-18 hours. The temperature is raised to 50-60℃ and the humidity is adjusted to 15%-18%. The moisture content is monitored simultaneously until the moisture content reaches 6%-8%.

[0073] The real wood substrate is subjected to slow cooling equilibration, cooling down to below 30°C at a rate of 3°C / h, and equilibrated in an environment with a humidity of 40%-45% for 8-12 hours.

[0074] In this embodiment, circulating air is introduced into the gradient drying process of the real wood substrate with a wind speed of 0.5m / s-1.2m / s to ensure the uniformity of drying. In the low-temperature dehumidification stage, moisture is slowly evaporated at low temperature to prevent surface hardening and eliminate internal stress. In the medium-temperature drying stage, the migration of bound water is promoted, and the lower limit of humidity is set at 20% to avoid over-drying and cracking. In the high-temperature setting stage, the moisture content of the real wood substrate is monitored every 2 hours to prevent over-drying. A moisture content tester is used to test the moisture content by inserting electrodes and using the resistance method. In the slow cooling equilibrium stage, the temperature is reduced at a rate of 3℃ / h to avoid sudden temperature drops, eliminate residual stress, and thus improve the dimensional stability of the real wood substrate. The real wood substrate is subjected to gradient drying, so that the moisture content of the real wood substrate is controlled at 6%-8%, which significantly reduces the expansion and contraction of wood caused by temperature and humidity changes. By matching the evaporation rate with temperature and humidity gradients, the deformation of the real wood substrate is reduced and the stress of the real wood substrate is eliminated, thereby making the coating effect of the real wood water-based high-gloss coating sprayed on the real wood substrate better.

[0075] Furthermore, after gradient drying of the real wood substrate, trace amounts of oil, wax, or tannic acid may remain on its surface, and its surface energy is relatively low, approximately 20 mN / m-40 mN / m, thus affecting the wettability of the water-based high-gloss coating for real wood. Therefore, after gradient drying of the real wood substrate, it is necessary to perform plasma treatment on the real wood substrate using an ion generator, including the following steps:

[0076] The real wood substrate is placed inside the processing chamber of the ion generator;

[0077] The working gas is introduced and the high-voltage pulse power supply of the ion generator is activated, and the surface of the real wood substrate is scanned through the nozzle of the ion generator.

[0078] The real wood substrate must be coated with water-based high-gloss paint within 2 hours after treatment.

[0079] In this embodiment, an active particle cloud containing electrons, ions, and free radicals is generated by ionizing the working gas Ar, O2, or N2. This cloud interacts with the wood surface to remove oils, waxes, or tannins from the real wood and introduce polar groups such as hydroxyl (-OH) and carboxyl (-COOH), thereby increasing the surface energy of the real wood substrate and enhancing the wettability of the water-based high-gloss coating. The plasma treatment, which eliminates the need for solvent treatment, makes the processing of the real wood substrate more environmentally friendly. Plasma treatment can efficiently solve the surface contamination problem after gradient drying of the real wood substrate, providing an ideal substrate for the uniform coating of the water-based high-gloss coating.

[0080] Furthermore, in one embodiment, the power density of the ion generating device is 0.5 W / cm². 2 -1W / cm 2 The processing time for the real wood substrate is 10-60 seconds. The working gas is a mixture of Ar and O2, with a flow rate controlled at 5-15 L / min. The nozzle scanning speed is 10 mm / s, the nozzle height is 5-10 mm, and the high-voltage pulse power supply voltage is 1 kV-10 kV. In this embodiment, when the power density of the ion generator is high, the roughness of the processed real wood substrate is high; when the power density of the ion generator is less than 1 W / cm³, the surface roughness is high. 2 During the process, excessive etching of the real wood substrate surface is avoided, and micro-etching of the real wood substrate surface enhances the coating anchoring effect, thereby increasing the adhesion between the real wood water-based high-gloss coating and the real wood substrate surface; plasma treatment of the real wood substrate through ion generation equipment increases the surface energy of the real wood substrate to over 60mN / m, increasing the wettability of the real wood water-based high-gloss coating, allowing the coating to spread completely after application, thereby improving the gloss of the real wood water-based high-gloss coating; the Ar and O2 mixture is mainly inert, with an Ar to O2 ratio of 1:9 to 2:8. Oxygen provides controlled oxidation to generate a large number of -OH or -COOH groups, while argon inhibits excessive oxidation and protects the lignin structure on the surface of the real wood substrate.

[0081] Furthermore, the surface of the real wood substrate may contain residues from plasma treatment or adsorbed environmental pollutants, making the requirements for the substrate extremely high for water-based high-gloss coatings for real wood. Therefore, after plasma treatment of the real wood substrate using an ion generator and before spraying the water-based high-gloss coating onto it, the following steps are also included:

[0082] Place the real wood substrate in a constant temperature and humidity chamber for 15-20 minutes, at a temperature of 22-25℃ and a humidity of 42%-44%.

[0083] The process involves unidirectional wiping with a solution of ethanol and deionized water using microfiber nonwoven fabric, followed by dust removal using an ion air gun.

[0084] In this embodiment, the temperature and humidity set in the constant temperature and humidity chamber are close to the equilibrium moisture content of the real wood substrate, which helps to reduce dimensional changes caused by moisture absorption or loss. Plasma treatment causes excessive surface temperature gradient differences in the real wood substrate; by allowing it to stand in the constant temperature and humidity chamber, the temperature of the real wood substrate becomes uniform, thus avoiding uneven flash-drying of the coating. The volume ratio of ethanol to deionized water is 9:1. The solution of ethanol and deionized water can dissolve the organic matter remaining after plasma treatment. One-way wiping avoids fiber shedding and secondary contamination, ensuring the surface of the real wood substrate is clean. The cleanliness is achieved by dissolving organic matter with ethanol and removing particles with microfiber nonwoven fabric, thereby removing plasma-generated residues and environmental dust. The evaporation of ethanol and deionized water solution after wiping has little direct impact on surface energy. Ion air gun dust removal can improve the cleanliness and physical state of the real wood substrate, with relatively little chemical impact on surface energy. The combined action of ethanol and deionized water solution wiping and ion air gun dust removal on the surface of the real wood substrate removes pollutants and eliminates static electricity, providing an ideal base for the uniform coating of water-based high-gloss coatings on real wood.

[0085] In one embodiment, a method for preparing automotive wood interior trim, using a water-based high-gloss wood coating, includes the following steps: spraying the water-based high-gloss wood coating onto a wood substrate to obtain a sprayed interior trim; baking and curing the sprayed interior trim at a pre-curing temperature of 78℃-82℃ for 60-90 minutes to obtain a pre-cured interior trim; and UV curing the pre-cured interior trim to obtain a high-gloss finish automotive wood interior trim.

[0086] The water-based high-gloss wood coating comprises component A and component B. Component A includes the following components by weight: 50-65 parts water-based acrylic resin; 25-35 parts water-based polyurethane acrylic resin; 3-10 parts water-based fluorocarbon emulsion; 0.5-2 parts surface additives; and 3.0-5.0 parts film-forming aids. Component B is an isocyanate curing agent, and the mass ratio of component A to the isocyanate curing agent is 1:1 to 3:1. The water-based polyurethane acrylic resin is a self-initiating water-based polyurethane acrylate. The film-forming aid is at least one of propylene glycol methyl ether, ethylene glycol butyl ether, and dipropylene glycol butyl ether. The hydroxyl value of the water-based acrylic resin ranges from 35 mg / KOH to 180 mg / KOH. The gloss of the water-based high-gloss wood coating is ≥95°. The viscosity of the water-based acrylic resin is less than 3000 mPa·s.

[0087] The method for preparing the real wood water-based high-gloss coating includes the following steps: sequentially adding water-based acrylic resin, water-based polyurethane acrylic resin, water-based fluorocarbon emulsion, surface additives, and surface additives and dispersing them at a dispersion speed of 200 r / min-400 r / min; then increasing the dispersion speed to 600 r / min-800 r / min and dispersing for 40 min-60 min to obtain component A; and mixing component A with isocyanate curing agent until homogeneous to obtain the real wood water-based high-gloss coating.

[0088] Compared with the prior art, this disclosure has at least the following advantages:

[0089] The aforementioned water-based high-gloss wood coating utilizes the cross-linking of hydroxyl groups in water-based acrylic resin with isocyanate curing agent. Water-based acrylic resin serves as the primary film-forming substance, providing the coating with basic hardness, gloss, weather resistance, and adhesion. UV-cured cross-linking of water-based polyurethane acrylic resin increases the coating's adhesion and hardness, thereby improving its alcohol and acid / alkali resistance. The fluorocarbon resin in the water-based fluorocarbon emulsion enhances weather resistance, reduces yellowing of the water-based high-gloss wood coating, and improves the overall hydrophobicity of the film, preventing moisture from contacting the wood and reducing the risk of deformation and cracking. Through the compounding of water-based acrylic resin, polyurethane acrylic resin, and fluorocarbon resin, the water-based high-gloss wood coating forms a triple cross-linked network of "hydroxypropyl-polyurethane-fluorocarbon," resulting in better adhesion between the coating and the wood surface, thus improving the coating's adhesion, alcohol resistance, and weather resistance.

[0090] The following are some specific examples. When %, it refers to a percentage by weight. It should be noted that the following examples do not exhaustively list all possible scenarios, and unless otherwise specified, the materials used in the examples are commercially available.

[0091] Example 1

[0092] 60 kg of waterborne acrylic resin (DISEN WD583), 30 kg of waterborne polyurethane resin (Jiaxing Ruishi RS7955), 5 kg of waterborne fluorocarbon emulsion (Guangzhou Qilang FMA-12), 1 kg of leveling agent (BYK-333), 1 kg of ethylene glycol butyl ether, and 3 kg of dipropylene glycol butyl ether were added sequentially and mixed and dispersed at a dispersion speed of 200 r / min-400 r / min. The dispersion speed was then increased to 600 r / min-800 r / min, and the dispersion time was 40 min-60 min to obtain component A. Component B is 100 kg of curing agent (BURNOCK DNW-5500-ZS).

[0093] Component A is then mixed with (BURNOCK DNW-5500-ZS) at a weight ratio of 30:10 and stirred evenly. The mixture is then sprayed onto the real wood substrate of new energy vehicles. After pre-curing at 80℃ for 60 minutes, it is then UV cured and cooled to obtain a high-gloss paint finish for the real wood interior parts of the car.

[0094] Example 2

[0095] 60 kg of waterborne acrylic resin (DISEN WD588), 30 kg of waterborne polyurethane resin (Jiaxing Ruishi RS7955), 5 kg of waterborne fluorocarbon emulsion (Guangzhou Qilang FMA-12), 1 kg of leveling agent (BYK-333), 1 kg of ethylene glycol butyl ether, and 3 kg of dipropylene glycol butyl ether were added sequentially and mixed and dispersed at a dispersion speed of 200 r / min-400 r / min. The dispersion speed was then increased to 600 r / min-800 r / min, and the dispersion time was 40 min-60 min to obtain component A. Component B is 100 kg of curing agent (BURNOCK DNW-5500-ZS).

[0096] Component A is then mixed with (BURNOCK DNW-5500-ZS) at a weight ratio of 30:10 and stirred evenly. The mixture is then sprayed onto the real wood substrate of new energy vehicles. After pre-curing at 80℃ for 60 minutes, it is then UV cured and cooled to obtain a high-gloss paint finish for the real wood interior parts of the car.

[0097] Example 3

[0098] Add 60 kg of waterborne acrylic resin (DISEN WD584), 30 kg of waterborne polyurethane resin (Jiaxing Ruishi RS7955), 5 kg of waterborne fluorocarbon emulsion (Guangzhou Qilang FMA-12), 1 kg of leveling agent (BYK-333), 1 kg of ethylene glycol butyl ether, and 3 kg of dipropylene glycol butyl ether sequentially and disperse them at a speed of 200 r / min-400 r / min. Then increase the dispersion speed to 600 r / min-800 r / min and disperse for 40-60 min to obtain component A. Component B is 100 kg of curing agent (BURNOCK DNW-5500-ZS).

[0099] Component A is then mixed with (BURNOCK DNW-5500-ZS) at a weight ratio of 30:10 and stirred evenly. The mixture is then sprayed onto the real wood substrate of new energy vehicles. After pre-curing at 80℃ for 60 minutes, it is then UV cured and cooled to obtain a high-gloss paint finish for the real wood interior parts of the car.

[0100] Example 4

[0101] Add 65 kg of waterborne acrylic resin (DISEN WD582), 25 kg of waterborne polyurethane resin (Jiaxing Ruishi RS7955), 5 kg of waterborne fluorocarbon emulsion (Guangzhou Qilang FMA-12), 1 kg of leveling agent (BYK-333), 1 kg of ethylene glycol butyl ether, and 3 kg of dipropylene glycol butyl ether sequentially and disperse them at a speed of 200 r / min-400 r / min; then increase the dispersion speed to 600 r / min-800 r / min and disperse for 40-60 min to obtain component A. Component B is 100 kg of curing agent (BURNOCK DNW-5500-ZS).

[0102] Component A is then mixed with (BURNOCK DNW-5500-ZS) at a weight ratio of 30:10 and stirred evenly. The mixture is then sprayed onto the real wood substrate of new energy vehicles. After pre-curing at 80℃ for 60 minutes, it is then UV cured and cooled to obtain a high-gloss paint finish for the real wood interior parts of the car.

[0103] Example 5

[0104] 60 kg of waterborne acrylic resin (DISEN WD583), 30 kg of waterborne polyurethane resin (Jiaxing Ruishi RS7955), 5 kg of waterborne fluorocarbon emulsion (Guangzhou Qilang FMA-12), 1 kg of leveling agent (BYK-333), 1 kg of ethylene glycol butyl ether, and 3 kg of dipropylene glycol butyl ether were added sequentially and mixed and dispersed at a dispersion speed of 200 r / min-400 r / min; then the dispersion speed was increased to 600 r / min-800 r / min, and the dispersion time was 40-60 min to obtain component A. Component B is 100 kg of curing agent (BURNOCK DNW-5502).

[0105] Component A and curing agent (BURNOCK DNW-5502) are mixed and stirred evenly at a weight ratio of 30:10. The mixture is then sprayed onto the real wood substrate of new energy vehicles. After pre-curing at 80℃ for 60 minutes, UV curing is performed. After cooling, a high-gloss paint finish is obtained for the real wood interior parts of the car.

[0106] Example 6

[0107] Add 60 kg of waterborne acrylic resin (DISEN WD588), 30 kg of waterborne polyurethane resin (Jiaxing Ruishi RS7955), 5 kg of waterborne fluorocarbon emulsion (Guangzhou Qilang FMA-12), 1 kg of leveling agent (BYK-333), 1 kg of ethylene glycol butyl ether, and 3 kg of dipropylene glycol butyl ether sequentially and disperse them at a speed of 200 r / min-400 r / min. Then increase the dispersion speed to 600 r / min-800 r / min and disperse for 40-60 min to obtain component A. Component B is 100 kg of curing agent (BURNOCK DNW-5502).

[0108] Component A and curing agent (BURNOCK DNW-5502) are mixed and stirred evenly at a weight ratio of 30:10. The mixture is then sprayed onto the real wood substrate of new energy vehicles. After pre-curing at 80℃ for 60 minutes, UV curing is performed. After cooling, a high-gloss paint finish is obtained for the real wood interior parts of the car.

[0109] Example 7

[0110] Add 60 kg of waterborne acrylic resin (DISEN WD584), 30 kg of waterborne polyurethane resin (Jiaxing Ruishi RS7955), 5 kg of waterborne fluorocarbon emulsion (Guangzhou Qilang FMA-12), 1 kg of leveling agent (BYK-333), 1 kg of ethylene glycol butyl ether, and 3 kg of dipropylene glycol butyl ether sequentially and disperse them at a speed of 200 r / min-400 r / min. Then increase the dispersion speed to 600 r / min-800 r / min and disperse for 40-60 min to obtain component A. Component B is 100 kg of curing agent (BURNOCK DNW-5502).

[0111] Component A and curing agent (BURNOCK DNW-5502) are mixed and stirred evenly at a weight ratio of 30:10. The mixture is then sprayed onto the real wood substrate of new energy vehicles. After pre-curing at 80℃ for 60 minutes, UV curing is performed. After cooling, a high-gloss paint finish is obtained for the real wood interior parts of the car.

[0112] Example 8

[0113] Add 65 kg of waterborne acrylic resin (DISEN WD582), 25 kg of waterborne polyurethane resin (Jiaxing Ruishi RS7955), 5 kg of waterborne fluorocarbon emulsion (Guangzhou Qilang FMA-12), 1 kg of leveling agent (BYK-333), 1 kg of ethylene glycol butyl ether, and 3 kg of dipropylene glycol butyl ether sequentially and disperse them at a speed of 200 r / min-400 r / min. Then increase the dispersion speed to 600 r / min-800 r / min and disperse for 40-60 min to obtain component A. Component B is 100 kg of curing agent (BURNOCK DNW-5502).

[0114] Component A and curing agent (BURNOCK DNW-5502) are mixed and stirred evenly at a weight ratio of 30:10. The mixture is then sprayed onto the real wood substrate of new energy vehicles. After pre-curing at 80℃ for 60 minutes, UV curing is performed. After cooling, a high-gloss paint finish is obtained for the real wood interior parts of the car.

[0115] Comparative Example 1

[0116] Add 65 kg of waterborne acrylic resin (DISEN WD583), 25 kg of waterborne polyurethane resin (Jiaxing Ruishi RS7955), 5 kg of waterborne fluorocarbon emulsion (Guangzhou Qilang FMA-12), 1 kg of leveling agent (BYK-333), 1 kg of ethylene glycol butyl ether, and 3 kg of dipropylene glycol butyl ether in sequence. Mix and disperse at a speed of 200 r / min-400 r / min; then increase the dispersion speed to 600 r / min-800 r / min and disperse for 40-60 min to obtain component A. Component B is 100 kg of curing agent (BURNOCK DNW-5500-ZS).

[0117] Component A and curing agent (BURNOCK DNW-5500-ZS) are mixed and stirred evenly at a weight ratio of 30:10. The mixture is then sprayed onto the real wood substrate of new energy vehicles. After pre-curing at 80℃ for 60 minutes, UV curing is performed. After cooling, a high-gloss paint finish is obtained for the real wood interior parts of the car.

[0118] Comparative Example 2

[0119] Add 62 kg of waterborne acrylic resin (DISEN WD583), 25 kg of waterborne polyurethane resin (Jiaxing Ruishi RS7955), 3 kg of waterborne fluorocarbon emulsion (Guangzhou Qilang FMA-12), 1 kg of leveling agent (BYK-333), 1 kg of ethylene glycol butyl ether, and 3 kg of dipropylene glycol butyl ether sequentially and disperse them at a speed of 200 r / min-400 r / min. Then increase the dispersion speed to 600 r / min-800 r / min and disperse for 40-60 min to obtain component A. Component B is 100 kg of curing agent (BURNOCK DNW-5500-ZS).

[0120] Component A and curing agent (BURNOCK DNW-5500-ZS) are mixed and stirred evenly at a weight ratio of 30:10. The mixture is then sprayed onto the real wood substrate of new energy vehicles. After pre-curing at 80℃ for 60 minutes, UV curing is performed. After cooling, a high-gloss paint finish is obtained for the real wood interior parts of the car.

[0121] Comparative Example 3

[0122] Add 60 kg of waterborne acrylic resin (DISEN WD588), 32 kg of waterborne polyurethane resin (Jiaxing Ruishi RS7955), 3 kg of waterborne fluorocarbon emulsion (Guangzhou Qilang FMA-12), 1 kg of leveling agent (BYK-333), 1 kg of ethylene glycol butyl ether, and 3 kg of dipropylene glycol butyl ether sequentially and disperse them at a speed of 200 r / min-400 r / min. Then increase the dispersion speed to 600 r / min-800 r / min and disperse for 40-60 min to obtain component A. Component B is 100 kg of curing agent (BURNOCK DNW-5500-ZS).

[0123] Component A and curing agent (BURNOCK DNW-5500-ZS) are mixed and stirred evenly at a weight ratio of 30:10. The mixture is then sprayed onto the real wood substrate of new energy vehicles. After pre-curing at 80℃ for 60 minutes, UV curing is performed. After cooling, a high-gloss paint finish is obtained for the real wood interior parts of the car.

[0124] Comparative Example 4

[0125] Add 60 kg of waterborne acrylic resin (DISEN WD588), 32 kg of waterborne polyurethane resin (Jiaxing Ruishi RS7955), 3 kg of waterborne fluorocarbon emulsion (Guangzhou Qilang FMA-12), 1 kg of leveling agent (BYK-333), 1 kg of ethylene glycol butyl ether, and 3 kg of dipropylene glycol butyl ether sequentially and disperse them at a speed of 200 r / min-400 r / min. Then increase the dispersion speed to 600 r / min-800 r / min and disperse for 40-60 min to obtain component A. Component B is 100 kg of curing agent (BURNOCK DNW-5500-ZS).

[0126] Component A and curing agent (BURNOCK DNW-5500-ZS) are mixed and stirred evenly at a weight ratio of 30:10. The mixture is then sprayed onto the real wood substrate of new energy vehicles. After pre-curing at 80℃ for 60 minutes, UV curing is performed. After cooling, a high-gloss paint finish is obtained for the real wood interior parts of the car.

[0127] It should be noted that the raw materials used come from the following sources:

[0128] Waterborne acrylic resin: DISEN WD583, Tg: 40℃, hydroxyl value: 130mg KOH / g, acid value ≤2mgKOH / g, pH 7.3-8.3, solid content 43-45%, viscosity 20-1000 (mPa.s, 25℃);

[0129] Waterborne acrylic resin: DISEN WD584, hydroxyl value: 55mg KOH / g, acid value ≤2mg KOH / g, pH 7.0-8.5, solid content 44-46%, viscosity 100-3000 (mPa.s, 25℃);

[0130] Waterborne acrylic resin: DISEN WD582, Tg: 70℃, hydroxyl value: 72mg KOH / g, acid value ≤2mg KOH / g, pH 7.3-8.3, solid content 40-43%, viscosity 100-1000 (mPa.s, 25℃);

[0131] Waterborne acrylic resin: DISEN WD588, Tg: 70℃, hydroxyl value: 35mg KOH / g, acid value ≤2mg KOH / g, pH 7.7-8.7, solid content 40-47%, viscosity 100-3000 (mPa.s, 25℃);

[0132] Waterborne polyurethane resin: Jiaxing Ruishi RS7955, viscosity 20-1000 (mPa.s, 25°C), pH 7.0-9.0, solid content 39-41%;

[0133] Waterborne fluorocarbon resin emulsion: Guangzhou Qilang FMA-12, minimum film-forming temperature 12℃, pH 7.5-8.5, solid content 38-46%, viscosity 100S;

[0134] Additive: BYK-333 from BYK Corporation, a polyether-modified dimethylsiloxane leveling agent;

[0135] Hardener: DISEN BURNOCK DNW-5500-ZS;

[0136] Hardener: DISEN BURNOCK DNW-5502.

[0137] Table 1. Formulation ratios of the real wood water-based high-gloss coatings used in the examples and comparative examples.

[0138]

[0139] Table 2 Performance test results of the examples and comparative examples

[0140]

[0141] It should be noted that the performance tests are as follows:

[0142] 1. Conventional adhesion test: Cross-cut adhesion test, referring to national standard GB / T9286;

[0143] 2. Weather resistance: Tested using a QUV aging machine with a light intensity set to 750-910 W / m². 2 The black label is set at 100°C and 50% relative humidity; the radiation intensity on the plane is 1.25 W / m. 2 nm, duration 600h. After removal, observe the sample surface for defects such as cracks, powdering, deformation, spots, whitening, yellowing, etc., that affect the appearance quality of the product, and perform grayscale rating according to the grayscale level requirements of GB / T 250-2008;

[0144] 3. Alcohol resistance: The alcohol abrasion tester was used. White non-woven fabric was soaked in anhydrous ethanol, 1000 grams of load was applied, the speed was 60 times / minute, and the test was repeated 300 times. The appearance of the water-based high-gloss coating film was observed to see if there were any obvious changes or dissolution.

[0145] 4. High temperature and high humidity performance: After being placed at 90℃ and 90% humidity for 168 hours, observe the appearance for any obvious changes and test the adhesion of the water-based high-gloss coating film.

[0146] from Figure 3 As shown in Tables 1 and 2, the water-based high-gloss coatings for real wood prepared in Examples 1-8 have excellent coating adhesion, weather resistance, alcohol resistance, and high temperature and humidity resistance, resulting in high-gloss automotive wood interior parts with high gloss finish.

[0147] A comparison of Examples 1-8 with Comparative Examples 1-4 shows that Examples 1-4 exhibit better adhesion, weather resistance, alcohol resistance, and high-temperature and high-humidity performance. This indicates that the coating formed by the waterborne acrylic resin, waterborne polyurethane resin, and waterborne fluorocarbon emulsion in a "hydroxypropyl-polyurethane-fluorocarbon" triple cross-linked network has good adhesion to the surface of real wood, thereby improving the adhesion, alcohol resistance, and weather resistance of the waterborne high-gloss coating for real wood. Changes in the ratio of waterborne acrylic resin to waterborne polyurethane resin can affect adhesion, and too low a content of waterborne fluorocarbon emulsion can reduce weather resistance.

[0148] A comparison of Examples 3 and 4 with Examples 7 and 8 shows that when BURNOCK DNW-5502 was used in Examples 7 and 8, the alcohol resistance of Examples 7 and 8 decreased. This indicates that BURNOCK DNW-5502 has better compatibility with the waterborne acrylic resin, waterborne polyurethane resin, and waterborne fluorocarbon emulsion in component A. The use of different curing agents has a significant impact on alcohol resistance.

[0149] A comparison of Example 2 with Comparative Examples 3 and 4 shows that the coating performance changes when the ratio of waterborne polyurethane resin to waterborne fluorocarbon emulsion changes. When using curing agent BURNOCK DNW-DNW-5502, the overall performance of the coating is better than that when using curing agent BURNOCK DNW-5500-ZS. This indicates that selecting a suitable curing agent can ensure that the waterborne high-gloss coating forms a stable cross-linked structure during the curing process, thereby improving the durability and stability of the waterborne high-gloss coating.

[0150] By comparing Example 1 with Comparative Examples 1 and 2, it can be seen that the adhesion of Comparative Examples 1 and 2 decreased. This indicates that when the proportion of water-based acrylic resin is too high, the coating film after dual curing at 80°C and UV is more brittle, and the overall adhesion of the coating to the real wood interior parts decreases, resulting in poorer performance.

[0151] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A method for preparing automotive wood interior trim parts coated with a water-based high-gloss paint, characterized in that, Waterborne acrylic resin, waterborne polyurethane acrylic resin, waterborne fluorocarbon emulsion, surface additives and film-forming aids are added sequentially and mixed and dispersed at a dispersion speed of 200 r / min-400 r / min; then the dispersion speed is increased to 600 r / min-800 r / min and the dispersion time is 40 min-60 min to obtain component A. Component A is mixed and stirred evenly with isocyanate curing agent to obtain a real wood water-based high-gloss coating; The water-based high-gloss coating for real wood is sprayed onto a real wood substrate to obtain a sprayed interior part. The sprayed interior trim is pre-cured by baking at a temperature of 78℃-82℃ for 60min-90min to obtain pre-cured interior trim. The pre-cured interior trim is UV-cured to obtain a high-gloss finish automotive wood interior trim; the moisture content of the wood substrate is 6%-8%. The real wood water-based high-gloss coating includes component A and component B, wherein component A comprises the following components by weight: 50-60 parts of water-based acrylic resin; 30-35 parts of waterborne polyurethane acrylic resin; 5-10 parts of water-based fluorocarbon emulsion; Surface additives: 0.5-2 parts; Film-forming aid 3.0-5.0 parts; Component B is an isocyanate curing agent, and the mass ratio of component A to the isocyanate curing agent is 1:1 to 3:1; the waterborne polyurethane acrylic resin is a self-initiating waterborne polyurethane acrylate; the hydroxyl value of the waterborne acrylic resin ranges from 35 mg / KOH to 180 mg / KOH.

2. The method for preparing automotive wood interior parts coated with water-based high-gloss paint according to claim 1, characterized in that, The film-forming aid is at least one of propylene glycol methyl ether, ethylene glycol butyl ether, and dipropylene glycol butyl ether.

3. The method for preparing automotive wood interior parts coated with water-based high-gloss paint according to claim 1, characterized in that, The viscosity of the waterborne acrylic resin is less than 3000 mPa·s.

4. The method for preparing automotive wood interior parts coated with water-based high-gloss paint according to claim 1, characterized in that, The thickness of the water-based high-gloss coating for real wood cured on the real wood substrate is 30μm-35μm.

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