White coating as well as preparation method and application thereof

Abstract

The embodiment of the invention provides a white coating as well as a preparation method and application thereof. The preparation method of the white coating comprises the following steps: preparing bio-based UV resin; obtaining the following raw materials in parts by weight: 35 to 50 parts of bio-based UV resin, 20 to 30 parts of UV reactive diluent, 4 to 13 parts of matting powder, 1 to 2 parts of wax powder, 20 to 30 parts of titanium dioxide, 4 to 6 parts of photoinitiator, 0.1 to 0.2 part of defoaming agent, 1.0 to 1.5 parts of dispersing agent and 0.1 to 0.2 part of flatting agent; the raw materials are mixed to obtain the white coating. Wherein the content of bio-based carbon in the bio-based UV resin is 40%-50%. According to the white coating and the preparation method and application thereof provided by the embodiment of the invention, through the combined action of all the components, the bio-based content of the coating is greater than 20%, the gloss is between 10% and 70%, and the white coating has excellent water resistance, acid resistance, alkali resistance, alcohol resistance, dry heat resistance, damp heat resistance and yellowing resistance.

Description

Technical Field

[0001] The present invention relates to the field of coating technology, and in particular to a white coating and a preparation method and application thereof. Background Art

[0002] Wood coating is one of the important decoration materials, which is widely used for decoration and protection of furniture, floor, doors and windows, etc. It plays an important role in beautifying the home environment and improving the quality of life. With the improvement of people's living standards, the requirements for the decoration of wood coating are getting higher and higher, especially in the field of high-end customization. Many people will choose white furniture at home, especially the Nordic or modern minimalist style decoration. However, the problem of white furniture turning yellow after long-term use is also quite a headache.

[0003] In addition, the raw materials used in UV white paints on the market are all synthesized from petroleum cracking materials. The main reason is: the bio-based UV (Ultra-Violet) resins on the market are mainly made by reacting epoxidized soybean oil and acrylic acid. This bio-based UV resin contains a very small amount of reactive carbon-carbon double bond groups, and the resin odor and the residual after resin curing are extremely large. It also contains a benzene ring structure, which leads to slow coating reaction speed, poor coating resistance, strong coating odor and poor yellowing resistance.

[0004] Therefore, the current UV white coating faces the problem of non-renewable raw materials, or the raw materials are renewable but the coating film has poor resistance, strong coating film odor and poor yellowing resistance. Summary of the invention

[0005] In view of this, the embodiments of the present application provide a white coating and a preparation method and application thereof to solve the technical problems of poor coating resistance, strong coating odor and poor yellowing resistance of the coating formed by the existing white coating.

[0006] In a first aspect, the present invention provides a method for preparing a white coating, comprising the following steps:

[0007] Preparation of bio-based UV resin;

[0008] Obtain the following raw materials in parts by weight:

[0009] 35 to 50 parts of the bio-based UV resin, 20 to 30 parts of UV active diluent, 4 to 13 parts of matting powder, 1 to 2 parts of wax powder, 20-30 parts of titanium dioxide, 4 to 6 parts of photoinitiator, 0.1 to 0.2 parts of defoaming agent, 1.0 to 1.5 parts of dispersant and 0.1 to 0.2 parts of leveling agent;

[0010] The above raw materials are mixed to obtain the white paint;

[0011] The bio-based carbon content in the bio-based UV resin is 40% to 50%.

[0012] In some embodiments, the preparation of the bio-based UV resin comprises the following steps:

[0013] Mix a bio-based dibasic fatty acid, an alicyclic epoxy resin, triethylamine, hypophosphorous acid, and 2,6-di-tert-butyl-p-cresol, and then carry out a first reaction to obtain a first product;

[0014] Mix glycidyl acrylate, triethylamine, p-methoxyphenol, 2,6-di-tert-butyl-p-cresol, and the first product, and then carry out a second reaction to obtain the bio-based UV resin.

[0015] In some embodiments, the conditions of the first reaction include: reacting at a temperature of 110°C to 120°C for 6 to 7 hours.

[0016] In some embodiments, the steps of the second reaction include: mixing glycidyl acrylate, the triethylamine, the p-methoxyphenol, and the 2,6-di-tert-butyl-p-cresol, heating to 40°C to 50°C, holding for 0.5 to 1 hour, adding the first product, and reacting at a temperature of 110°C to 120°C for 2 to 4 hours.

[0017] In some embodiments, the bio-based dibasic fatty acid includes at least one of bio-based sebacic acid and bio-based dodecanedioic acid. In some embodiments, the molar ratio of the bio-based dibasic fatty acid to the alicyclic epoxy resin is (2.0 to 2.5):1. In some embodiments, the molar ratio of glycidyl acrylate to the first product is (2.0 to 2.5):1.

[0018] In some embodiments, in the reaction system at the initial stage of the first reaction: the mass percentage content of triethylamine is 0.1% to 0.2%; the mass percentage content of hypophosphorous acid is 0.1% to 0.3%; the mass percentage content of 2,6-di-tert-butyl-p-cresol is 0.05% to 0.2%.

[0019] In some embodiments, in the reaction system at the initial stage of the second reaction: the mass percentage content of triethylamine is 0.1% to 0.3%; the mass percentage content of p-methoxyphenol is 0.1% to 0.5%; the mass percentage content of 2,6-di-tert-butyl-p-cresol is 0.05% to 0.5%.

[0020] In a second aspect, an embodiment of the present application provides a white paint. The white paint is prepared by the preparation method described in the first aspect, and the white paint comprises the following components in parts by weight:

[0021] The invention comprises 35 to 50 parts of bio-based UV resin, 15 to 25 parts of UV active diluent, 4 to 13 parts of matting powder, 1 to 2 parts of wax powder, 20 to 30 parts of titanium dioxide, 4 to 6 parts of photoinitiator, 0.1 to 0.2 parts of defoaming agent, 1.0 to 1.5 parts of dispersant and 0.1 to 0.2 parts of leveling agent. The bio-based carbon content in the bio-based UV resin is 40% to 50%.

[0022] In a third aspect, an embodiment of the present application further provides a UV white coating film, wherein the UV white coating film is made by using the white coating material as described in the second aspect, and is applied by a roller coater and then cured by a gallium lamp and two mercury lamps.

[0023] In some embodiments, the yellowing degree ΔE of the UV white coating under preset test conditions is ≤1.5.

[0024] The white coating preparation method provided in the embodiment of the present application comprises a compound of a bio-based UV resin, a UV active diluent, a matting powder, a wax powder, a titanium dioxide, a photoinitiator, a defoamer, a dispersant and a leveling agent, so that the white coating is suitable for roller coating and curing under the conditions of a gallium lamp and two mercury lamps. Among them; the prepared bio-based UV resin, UV active diluent and dispersant can adjust the viscosity and fluidity of the coating, so that the white coating is suitable for roller coating; the wax powder is a bio-based wax powder, which can adjust the scratch resistance of the coating film and increase the bio-based carbon content of the white coating. Through the joint action of the various components, the white coating is cured under the irradiation of a gallium lamp and two mercury lamps, and the bio-based carbon content in the coating film of the white coating is ≥20%.

[0025] The white paint and application provided in the embodiments of the present application have extremely low coating odor, and the resistance meets the requirements of the HG / T3655-2024 UV-curing wood coating industry standard. The yellowing resistance ΔE of the white paint film is not higher than 1.5. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic flow chart of the method for preparing the white coating provided in the embodiment of the present application. DETAILED DESCRIPTION

[0028] In the following description, specific details such as specific system structures and technologies are provided for illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the embodiments of the present application may also be implemented in other embodiments without these specific details.

[0029] Currently, the bio-based UV (Ultra-Violet) resin on the market is mainly made by reacting epoxidized soybean oil and acrylic acid. This bio-based UV resin contains a very small amount of reactive carbon-carbon double bond groups, has a strong resin odor and a large amount of residual resin after curing, and contains a benzene ring structure, which leads to slow coating reaction speed, poor coating resistance, strong coating odor, and poor yellowing resistance. Therefore, most of the raw materials used in UV white coatings on the market are synthesized from petroleum cracking materials. However, the continuous consumption of petroleum resources and the rising prices in recent years have forced people to begin to seek and develop new renewable bio-based resins.

[0030] Based on this, in order to alleviate the problem of oil resource depletion and solve the problems of non-renewable raw materials of existing UV white coatings, strong coating film odor, poor coating film resistance and poor coating film yellowing resistance, the applicant invested heavily in the research and development of white coatings using bio-based UV resins. The bio-based carbon in this bio-based UV resin mainly comes from plants and is a renewable material. Its bio-based content is between 40-50%, and the resin odor and the residual after resin curing are extremely low. After being applied to white coatings, the coating film resistance and yellowing resistance are good.

[0031] For ease of understanding, the present application is specifically described by the following examples. It should be understood that the following examples are only used to further illustrate the present application scheme and are not used to limit the scope of the present application.

[0032] In a first aspect, the present application provides a white paint, such as Figure 1 As shown, the method comprises the following steps: S10, preparing a bio-based UV resin; wherein the bio-based carbon content in the bio-based UV resin is between 40% and 50%; S20, obtaining the following raw materials in parts by weight: 35 to 50 parts of bio-based UV resin, 20 to 30 parts of UV active diluent, 4 to 13 parts of matting powder, 1 to 2 parts of wax powder, 20-30 parts of titanium dioxide, 4 to 6 parts of photoinitiator, 0.1 to 0.2 parts of defoaming agent, 1.0 to 1.5 parts of dispersant and 0.1 to 0.2 parts of leveling agent; S30, mixing the above raw materials to obtain a white coating.

[0033] The first aspect of the present application provides a method for preparing white paint, wherein the prepared bio-based UV resin, UV active diluent, matting powder, wax powder, titanium dioxide, photoinitiator, defoamer, dispersant and leveling agent are compounded, so that the white paint is suitable for roller coating and curing under the conditions of one gallium lamp and two mercury lamps. The prepared bio-based UV resin, UV active diluent and dispersant can adjust the viscosity and fluidity of the paint, so that the white paint is suitable for roller coating; the wax powder is a bio-based wax powder, which can adjust the scratch resistance of the paint film and increase the bio-based carbon content of the white paint. Through the joint action of each component, the white paint is cured under the irradiation of a gallium lamp and two mercury lamps, and the bio-based carbon content in the film of the white paint is ≥20%. Using bio-based UV resin (bio-based carbon content 40% to 50%), it reduces dependence on petroleum-based raw materials and reduces carbon emissions. UV curing technology can achieve rapid curing (seconds), improve production efficiency, save energy, and give the paint excellent hiding power, yellowing resistance, surface smoothness and durability through the synergistic effect of each component in the formula.

[0034] In application, the white paint film has very low odor, and its resistance meets the requirements of the HG / T3655-2024 UV-curing wood coating industry standard. The yellowing resistance of the white paint film under the preset test conditions is ΔE≤1.5. The preset test conditions include: test equipment: QUV UV aging machine, wavelength: UVA-340, temperature: 60℃, irradiance: 0.68W / m2, time: 168h.

[0035] The content ratio of each raw material component in the white paint of the embodiment of the present application fully ensures the comprehensive performance of the white paint, such as processing performance, construction performance, curing film-forming performance, durability and yellowing resistance of the paint film.

[0036] In the above step S10: In some embodiments, the preparation of the bio-based UV resin includes the following steps:

[0037] S11, mixing bio-based dibasic fatty acid, alicyclic epoxy resin, hypophosphorous acid, triethylamine and 2,6-di-tert-butyl-p-cresol and performing a first reaction to obtain a first product; under the action of a tertiary amine catalyst such as triethylamine, the epoxy group of the alicyclic epoxy resin and the carboxyl group of the bio-based dibasic fatty acid react to generate a bio-based modified alicyclic epoxy resin, i.e., the first product. Among them, hypophosphorous acid and 2,6-di-tert-butyl-p-cresol are used as antioxidants to reduce the amount of by-products generated and increase the yield of the target product.

[0038] S12. Mix glycidyl acrylate, triethylamine, p-methoxyphenol, 2,6-di-tert-butyl-p-cresol and the first product, and then carry out the second reaction to obtain the bio-based UV resin. Under the action of tertiary amine catalysts such as triethylamine, the epoxy group of glycidyl acrylate reacts with the carboxyl group of the product of the first-step reaction to generate a bio-based material modified resin, that is, the bio-based UV resin. Among them, hydroquinone is used as an inhibitor, and 2,6-di-tert-butyl-p-cresol is used as an antioxidant to reduce the generation amount of by-products and improve the yield of the target product.

[0039] In the above step S11, in some embodiments, the conditions of the first reaction include: reacting for 6 to 7 hours under the condition of a temperature of 110°C to 120°C; under this reaction condition, it is beneficial for tertiary amine catalysts such as triethylamine to catalyze the reaction of the carboxyl group of alicyclic epoxy resin and bio-based dibasic fatty acid to generate a bio-based modified alicyclic epoxy resin, that is, the first product. Exemplarily, the temperature condition of the first reaction can be any typical but non-limiting point value such as 110°C, 113°C, 115°C, 118°C, 120°C, etc. or an interval value between any two typical but non-limiting point values, and the reaction duration can be any typical but non-limiting point value such as 6 hours, 6.5 hours, 7 hours, etc. or an interval value between any two typical but non-limiting point values.

[0040] In some embodiments, the bio-based dibasic fatty acid belongs to plant renewable biomass. By means of a synthesis reaction, bio-based materials are introduced into the resin to replace traditional non-renewable resource components derived from petroleum, coal, etc., improve the bio-based content of the UV resin, and make the bio-based UV resin more green and environmentally friendly. In some embodiments, the molar ratio of the bio-based dibasic fatty acid to the alicyclic epoxy resin is (2.0 - 2.5):1; specifically, it can be any typical but non-limiting point value such as 2.0:1, 2.5:1, etc. or an interval value between any two typical but non-limiting point values. Under this ratio, it can ensure that the carboxyl groups of the alicyclic epoxy resin and the bio-based dibasic fatty acid react fully, reduce the generation of by-products, and improve the yield of the target product.

[0041] In some embodiments, in the reaction system at the initial stage of the first reaction, the mass percentages of hypophosphorous acid, triethylamine, and 2,6-di-tert-butyl-p-cresol are 0.1% to 0.2%, 0.1% to 0.3%, and 0.05% to 0.2% in sequence. Under this ratio, triethylamine can ensure the catalysis of the reaction between the epoxy group of the alicyclic epoxy resin and the carboxyl group of the bio-based dibasic fatty acid, and p-methoxyphenol has a sufficient polymerization inhibition effect. Hypophosphorous acid and 2,6-di-tert-butyl-p-cresol have a sufficient antioxidant effect, reducing the generation amount of by-products and increasing the yield of the target product. Exemplarily, in the reaction system at the initial stage of the first reaction, the mass percentage of hypophosphorous acid can be any typical but non-limiting point value such as 0.1%, 0.15%, 0.2%, etc. or an interval value between any two typical but non-limiting point values; the mass percentage of triethylamine can be any typical but non-limiting point value such as 0.1%, 0.15%, 0.2%, etc. or an interval value between any two typical but non-limiting point values; the mass percentage of 2,6-di-tert-butyl-p-cresol can be any typical but non-limiting point value such as 0.05%, 0.1%, 0.15%, 0.2%, etc. or an interval value between any two typical but non-limiting point values.

[0042] In the above step S12, glycidyl acrylate, the triethylamine, the p-methoxyphenol, and the 2,6-di-tert-butyl-p-cresol are mixed and then heated to 40°C to 50°C. After holding for 0.5 to 1 hour, the first product is added, and the reaction is carried out for 2 to 4 hours under the condition that the temperature is 110°C to 120°C. The glycidyl acrylate used in the embodiments of the present application contains an epoxy group and a carbon-carbon double bond. It is found that when the temperature is 110°C to 120°C and there are basic catalysts such as tertiary amines, the reaction may need to be carried out at about 110 - 120°C to proceed rapidly. In addition, glycidyl acrylate contains a carbon-carbon double bond and can be applied to ultraviolet curable coatings after grafting to the first product. Exemplarily, glycidyl acrylate, the triethylamine, the p-methoxyphenol, and the 2,6-di-tert-butyl-p-cresol are mixed and then heated to any typical but non-limiting point value such as 40°C, 42°C, 45°C, 48°C, 50°C, etc. or an interval value between any two typical but non-limiting point values, held for any typical but non-limiting point value such as 0.5 hour, 1.0 hour, 1.5 hours, etc. or an interval value between any two typical but non-limiting point values, the first product is added, and the reaction is carried out for any typical but non-limiting point value such as 2 hours, 3 hours, 4 hours, etc. or an interval value between any two typical but non-limiting point values under the condition that the temperature is any typical but non-limiting point value such as 110°C, 115°C, 120°C, etc.

[0043] In some embodiments, the molar ratio of glycidyl acrylate to the first product is (2.0 - 2.5):1; in this case, it fully ensures that the epoxy groups of glycidyl acrylate react with the carboxyl groups of the first-step reaction product to form a bio-based material modified resin, i.e., a bio-based UV resin. Exemplarily, the molar ratio of glycidyl acrylate to the first product can be any typical but non-limiting point value such as 2.0:1, 2.5:1, etc. or an interval value between any two typical but non-limiting point values.

[0044] In some embodiments, in the reaction system at the initial stage of the second reaction, the mass percentage contents of triethylamine, p-methoxyphenol, and 2,6-di-tert-butyl-p-cresol are 0.1% - 0.5%, 0.1% - 0.5%, and 0.05% - 0.5% in sequence. Among them, triethylamine can fully catalyze the reaction of glycidyl acrylate with the carboxyl groups of the first-step reaction product, p-methoxyphenol fully plays an inhibitory polymerization effect, and 2,6-di-tert-butyl-p-cresol fully plays an antioxidant effect, reducing the generation amount of by-products and increasing the yield of the target product. Exemplarily, in the reaction system at the initial stage of the second reaction, the mass percentage content of triethylamine can be any typical but non-limiting point value such as 0.1%, 0.2%, 0.3%, etc. or an interval value between any two typical but non-limiting point values; the mass percentage content of p-methoxyphenol can be any typical but non-limiting point value such as 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, etc. or an interval value between any two typical but non-limiting point values; the mass percentage content of 2,6-di-tert-butyl-p-cresol can be any typical but non-limiting point value such as 0.05%, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.40%, 0.45%, 0.5%, etc. or an interval value between any two typical but non-limiting point values.

[0045] In some embodiments, the bio-based dibasic fatty acid is selected from at least one of bio-based sebacic acid and bio-based dodecanedioic acid. In the embodiments of the present application, the bio-based dibasic fatty acid and alicyclic epoxy resin and glycidyl acrylate react in a certain proportion to obtain a bio-based UV resin. The resin has very low odor and residual odor after curing, and has excellent yellowing resistance; and the bio-based alkanedioic acid is the bio-based carbon source of the bio-based UV resin. In some embodiments, the UV active diluent is selected from at least one of 1,6-hexanediol diacrylate and tripropylene glycol diacrylate. The UV active diluent in the embodiment of the present application plays a role in adjusting the viscosity so that the white paint is suitable for roller coating; and after the UV active diluent is compounded with components such as bio-based UV resin, matting powder and wax powder, the gloss of the paint film is between 10-70%. In some embodiments, the matting powder is selected from at least one of Grace RAD2105 and Xinhui BS-2305. These matting powders are used to reduce the gloss of the coating film, increase the fullness of the coating film, and can give the coating film a delicate appearance. In some embodiments, the wax powder is selected from at least one of BYK Chemical CERAFLOUR1000 and CERAFLOUR1010; the wax powder used in the embodiment of the present application belongs to 100% bio-based wax powder, which can increase the bio-based content of the coating film, adjust the scratch resistance and feel, and make the white coating film scratch-resistant and feel excellent. In some embodiments, the surface curing photoinitiator is selected from at least one of methyl benzoylformate and phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide; these photoinitiators can quickly cure the surface of the coating, and the bio-based UV resin and UV active diluent, photoinitiator, etc. are compounded to provide coating film resistance, yellowing resistance and reduce the odor of the coating film. In some embodiments, the deep curing photoinitiator is selected from at least one of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and ethyl 2,4,6-trimethylbenzoylphenylphosphonate. These photoinitiators can quickly cure the deep layer of the coating, thereby promoting the adhesion of the coating film. In some embodiments, the defoamer is selected from at least one of Evonik Specialty Chemicals TEGO920 and BYK1791; the defoamer in the present embodiment can reduce the surface tension of the foaming liquid and change the size of the bubble surface pressure, thereby promoting the bubble rupture and foam dissipation, ensuring the smooth production and industrial construction of the white coating itself. In some embodiments, the dispersant is selected from BYK110 and BYK2009, Digo At least one of the above is compounded; the dispersant in the embodiment of the present application is used to ensure the uniformity and stability of the coating, improve the rheological properties of the coating, reduce the viscosity of the coating, improve the coating performance, and ensure the stability of the coating during construction and use. Among them, BYK110 is mainly used to disperse titanium dioxide to ensure the dispersion efficiency and fineness of titanium dioxide; BYK2009 and Digo It is mainly used to disperse the matting powder to ensure the dispersion efficiency and fineness of the matting powder. In some embodiments, the leveling agent is selected from Evonik Specialty Chemicals TEGO410, Dow Corning Dow At least one of the following. The leveling agent in the embodiment of the present application can promote the coating to form a flat, smooth and uniform coating film during the drying and film-forming process. It effectively reduces the surface tension of the coating liquid, improves its leveling and uniformity, and makes the film formation uniform and natural.

[0046] In some embodiments, the bio-based carbon content in the white paint is ≥ 20%, the bio-based carbon content in the paint is high, the raw material has good renewable performance, and it is green and environmentally friendly.

[0047] In a second aspect, the present application provides a white coating prepared by the above method, comprising the following components in parts by weight:

[0048] 35 to 50 parts of bio-based UV resin, 20 to 30 parts of UV active diluent, 4 to 13 parts of matting powder, 1 to 2 parts of wax powder, 20-30 parts of titanium dioxide, 4 to 6 parts of photoinitiator, 0.1 to 0.2 parts of defoaming agent, 1.0 to 1.5 parts of dispersant and 0.1 to 0.2 parts of leveling agent. The bio-based carbon content in the bio-based UV resin is between 40% and 50%.

[0049] The white paint provided in the embodiment of the present application, the prepared bio-based UV resin, UV active diluent and dispersant can adjust the viscosity and fluidity of the paint, making the white paint suitable for roller coating; the wax powder is a bio-based wax powder, which can adjust the scratch resistance of the paint film and increase the bio-based carbon content of the white paint. Through the joint action of each component, the white paint is cured under the irradiation of a gallium lamp and two mercury lamps, and the bio-based carbon content in the white paint film is ≥20%. In addition, the white paint film has extremely low odor, and the film resistance meets the requirements of the HG / T3655-2024 UV-curing wood coating industry standard, and the yellowing resistance ΔE of the white paint film is not higher than 1.5.

[0050] In a third aspect, the present application provides a UV white coating film. The UV white coating film uses the white paint as described in the second aspect, and is obtained by curing through a gallium lamp and two mercury lamps after being constructed by a roller coater. It emits broad-spectrum ultraviolet rays, covering the absorption wavelengths of most photoinitiators to ensure deep curing. It emits near-ultraviolet rays with a main peak of 405 nm, which is adapted to long-wavelength photoinitiators (such as 819), improves the surface curing efficiency, and reduces the influence of oxygen inhibition of polymerization. The mercury lamp provides a high energy density to quickly initiate resin cross-linking; the gallium lamp supplements long-wavelength curing, reduces energy waste, and shortens the curing time of the production line. It avoids problems such as sticky coating or poor weather resistance caused by incomplete curing of a single light source. The roller coating process can accurately control the coating amount, reduce sagging or uneven thickness, and meet the high appearance requirements of the matte white coating film. The continuous roller coating operation + UV second-level curing is suitable for mass production, significantly reducing labor and time costs.

[0051] In some embodiments, the bio-based carbon content in the UV white coating film is ≥20%. This meets the minimum requirements of international standards for bio-based products, enhances the market competitiveness of the product. It reduces the use of petroleum-based raw materials and reduces carbon emissions throughout the life cycle, in line with the "dual carbon" policy trend. On the premise of ensuring the hardness and yellowing resistance (ΔE≤1.5) of the coating film, through the synergistic effect of the bio-based resin and titanium dioxide, it avoids the decline in mechanical properties caused by too high a bio-based content.

[0052] In applications, the comprehensive performance of the UV white coating film is improved. Yellowing resistance and durability: Titanium dioxide (20-30 parts) reflects ultraviolet rays, and the bio-based resin reduces photodegradation by-products. Combined with deep curing by mercury lamps, it ensures a yellowing resistance level of ΔE≤1.5. Wax powder (1-2 parts) and matting powder (4-13 parts) enhance surface wear resistance and scratch resistance. The matte effect (matting powder) + high whiteness (titanium dioxide) meet the appearance requirements of high-end furniture and electronic products. The flexibility of the bio-based resin can relieve the brittleness of the coating, improve adhesion and impact resistance.

[0053] To enable those skilled in the art to clearly understand the above implementation details and operations of the present application, and to significantly reflect the improved performance of the white paint and its preparation method and application in the embodiments of the present application, the following uses multiple embodiments to illustrate the above technical solutions.

[0054] The preparation steps of the bio-based UV resin used in the following examples and comparative examples of the present application are as follows:

[0055] Bio-based UV Resin A: 1. Sequentially put sebacic acid, alicyclic epoxy resin, hypophosphorous acid, triethylamine, and 2,6-di-tert-butyl-p-cresol into a reaction kettle, start stirring, raise the temperature to 110°C - 120°C, and keep the temperature for 6 - 7 hours to obtain a first product; among them, the molar ratio of sebacic acid to alicyclic epoxy resin is 2.1:1, hypophosphorous acid is 0.3% of the total weight of the reactants, triethylamine is 0.1% of the total weight of the reactants, and 2,6-di-tert-butyl-p-cresol is 0.05% of the total weight of the reactants;

[0056] 2. Mix glycidyl acrylate, the said triethylamine, p-methoxyphenol, and the said 2,6-di-tert-butyl-p-cresol, then raise the temperature to 40°C - 50°C, start stirring, keep the temperature for 0.5 - 1 hour, then add the first product, and raise the temperature to 110°C - 120°C, and keep the temperature for 2 - 4 hours. Among them, the molar ratio of glycidyl acrylate to the first product is 2.2:1; triethylamine is 0.1% of the total weight of the reactants, p-methoxyphenol is 0.5% of the total weight of the reactants, and 2,6-di-tert-butyl-p-cresol is 0.5% of the total weight of the reactants. The bio-based carbon content of the prepared bio-based UV resin is 40%.

[0057] Bio-based UV Resin B: 1. Sequentially put bio-based dodecanedioic acid, alicyclic epoxy resin, hypophosphorous acid, triethylamine, and 2,6-di-tert-butyl-p-cresol into a reaction kettle, start stirring, raise the temperature to 110°C - 120°C, and keep the temperature for 6 - 7 hours to obtain a first product; among them, the molar ratio of bio-based dodecanedioic acid to alicyclic epoxy resin is 2.5:1, hypophosphorous acid is 0.1% of the total weight of the reactants, triethylamine is 0.2% of the total weight of the reactants, and 2,6-di-tert-butyl-p-cresol is 0.2% of the total weight of the reactants;

[0058] 2. Mix glycidyl acrylate, the said triethylamine, p-methoxyphenol, and the said 2,6-di-tert-butyl-p-cresol, then raise the temperature to 40°C - 50°C, start stirring, keep the temperature for 0.5 - 1 hour, then add the first product, and raise the temperature to 110°C - 120°C, and keep the temperature for 2 - 4 hours. Among them, the molar ratio of glycidyl acrylate to the first product is 1.9:1; triethylamine is 0.1% of the total weight of the reactants, p-methoxyphenol is 0.5% of the total weight of the reactants, and 2,6-di-tert-butyl-p-cresol is 0.5% of the total weight of the reactants. The bio-based carbon content of the prepared bio-based UV resin is 50%.

[0059] Bio-based UV Resin C: 1. Sequentially put phthalic acid, alicyclic epoxy resin, hypophosphorous acid, triethylamine, and 2,6-di-tert-butyl-p-cresol into a reaction kettle, start stirring, heat the temperature to 110°C - 120°C, and keep warm for 6 - 7 hours to obtain the first product; among them, the molar ratio of phthalic acid to alicyclic epoxy resin is 2.5:1, hypophosphorous acid is 0.1% of the total weight of the reactants, triethylamine is 0.2% of the total weight of the reactants, and 2,6-di-tert-butyl-p-cresol is 0.2% of the total weight of the reactants;

[0060] 2. Mix glycidyl acrylate, the triethylamine, the p-hydroxyanisole, and the 2,6-di-tert-butyl-p-cresol, then heat to 40°C - 50°C, start stirring, after keeping warm for 0.5 - 1 hour, add the first product, and heat to 110°C - 120°C, keep warm for 2 - 4 hours. Among them, the molar ratio of glycidyl acrylate to the first product is 1.9:1; triethylamine is 0.1% of the total weight of the reactants, p-hydroxyanisole is 0.5% of the total weight of the reactants, and 2,6-di-tert-butyl-p-cresol is 0.5% of the total weight of the reactants. The bio-based carbon content of the prepared bio-based UV resin is 0.

[0061] Bio-based UV Resin D: 1. Sequentially put bio-based dodecanedioic acid, epoxy soybean oil, hypophosphorous acid, triethylamine, and 2,6-di-tert-butyl-p-cresol into a reaction kettle, start stirring, heat the temperature to 110°C - 120°C, and keep warm for 6 - 7 hours to obtain the first product; among them, the molar ratio of bio-based dodecanedioic acid to epoxy soybean oil is 2.5:1, hypophosphorous acid is 0.1% of the total weight of the reactants, triethylamine is 0.2% of the total weight of the reactants, and 2,6-di-tert-butyl-p-cresol is 0.2% of the total weight of the reactants;

[0062] 2. Mix glycidyl acrylate, the triethylamine, the p-hydroxyanisole, and the 2,6-di-tert-butyl-p-cresol, then heat to 40°C - 50°C, start stirring, after keeping warm for 0.5 - 1 hour, add the first product, and heat to 110°C - 120°C, keep warm for 2 - 4 hours. Among them, the molar ratio of glycidyl acrylate to the first product is 1.9:1; triethylamine is 0.1% of the total weight of the reactants, p-hydroxyanisole is 0.5% of the total weight of the reactants, and 2,6-di-tert-butyl-p-cresol is 0.5% of the total weight of the reactants. The bio-based carbon content of the prepared bio-based UV resin is 88%.

[0063] Bio-based UV resin E: 1. Sequentially put bio-based dodecanedioic acid, E51 epoxy resin, hypophosphorous acid, triethylamine, and 2,6-di-tert-butyl-p-cresol into a reaction kettle, start stirring, and raise the temperature to 110°C to 120°C, and keep the temperature for 6 - 7 hours to obtain the first product; among them, the molar ratio of bio-based dodecanedioic acid to E51 epoxy resin is 2.5:1, hypophosphorous acid is 0.1% of the total weight of the reactants, triethylamine is 0.2% of the total weight of the reactants, and 2,6-di-tert-butyl-p-cresol is 0.2% of the total weight of the reactants;

[0064] 2. After mixing glycidyl acrylate, the triethylamine, p-methoxyphenol, and the 2,6-di-tert-butyl-p-cresol and heating to 40°C to 50°C, start stirring, keep the temperature for 0.5 - 1 hour, then add the first product, and raise the temperature to 110°C to 120°C, and keep the temperature for 2 - 4 hours. Among them, the molar ratio of glycidyl acrylate to the first product is 1.9:1; triethylamine is 0.1% of the total weight of the reactants, p-methoxyphenol is 0.5% of the total weight of the reactants, and 2,6-di-tert-butyl-p-cresol is 0.5% of the total weight of the reactants. The bio-based carbon content of the obtained bio-based UV resin is 48%.

[0065] Bio-based UV resin F: 1. Sequentially put bio-based dodecanedioic acid, alicyclic epoxy resin, hypophosphorous acid, triethylamine, and 2,6-di-tert-butyl-p-cresol into a reaction kettle, start stirring, and raise the temperature to 110°C to 120°C, and keep the temperature for 6 - 7 hours to obtain the first product; among them, the molar ratio of bio-based dodecanedioic acid to alicyclic epoxy resin is 2.5:1, hypophosphorous acid is 0.1% of the total weight of the reactants, triethylamine is 0.2% of the total weight of the reactants, and 2,6-di-tert-butyl-p-cresol is 0.2% of the total weight of the reactants;

[0066] 2. After mixing glycidyl methacrylate, the triethylamine, p-methoxyphenol, and the 2,6-di-tert-butyl-p-cresol and heating to 40°C to 50°C, start stirring, keep the temperature for 0.5 - 1 hour, then add the first product, and raise the temperature to 110°C to 120°C, and keep the temperature for 2 - 4 hours. Among them, the molar ratio of glycidyl methacrylate to the first product is 1.9:1; triethylamine is 0.1% of the total weight of the reactants, p-methoxyphenol is 0.5% of the total weight of the reactants, and 2,6-di-tert-butyl-p-cresol is 0.5% of the total weight of the reactants. The bio-based carbon content of the obtained bio-based UV resin is 49%.

[0067] Example 1

[0068] A white coating. After obtaining the following raw material components by weight, fully mix each raw material component evenly to obtain the white coating;

[0069] Bio-based UV Resin A: 35 kg; UV Reactive Diluent: 13.1 kg of Changxing Chemical EM221, 10 kg of Changxing Chemical EM223; Matting Agent: 4 kg of Xinhui BS-2305, 9 kg of Grace RAD2105; Wax Powder: 1 kg of BYK CERAFLOUR1000; Titanium Dioxide: 10 kg of DuPont Titanium Dioxide R900, 10 kg of DuPont Titanium Dioxide R706; Surface Curing Photoinitiator: Photoinitiator: 2 kg of Jushi New Materials JRCure1055, 3 kg of IG M Omnirad754; Deep Curing Photoinitiator: 0.5 kg of Jushi New Materials JRCure1108, 0.5 kg of Jushi New Materials JRCure1109; Defoamer: 0.1 kg of Evonik Specialty Chemicals TEGO920, 0.1 kg of BYK BYK1791; Dispersant: 0.3 kg of BYK BYK110, 0.6 kg of BYK BYK2009, 0.6 kg of Degussa Leveling Agent: 0.1 kg of Evonik Specialty Chemicals TEGO410, 0.1 kg of Dow Corning Dow

[0070] Example 2

[0071] A white coating, after obtaining the following raw material components by weight and mixing all the raw material components evenly, a white coating is obtained;

[0072] Bio-based UV Resin A: 35.3 kg; UV Reactive Diluent: 20.5 kg of Changxing Chemical EM223; Matting Agent: 7.5 kg of Xinhui BS-2305; Wax Powder: 1 kg of BYK CERAFLOUR1010; Titanium Dioxide: 30 kg of DuPont Titanium Dioxide R900; Surface Curing Photoinitiator: Photoinitiator: 4 kg of Jushi New Materials JRCure1055; Deep Curing Photoinitiator: 0.5 kg of Jushi New Materials JRCure1108; Defoamer: 0.1 kg of Evonik Specialty Chemicals TEGO920; Dispersant: 0.5 kg of BYK BYK110, 0.5 kg of BYK BYK2009; Leveling Agent: 0.1 kg of Evonik Specialty Chemicals TEGO410.

[0073] Example 3

[0074] A white coating, after obtaining the following raw material components by weight and mixing all the raw material components evenly, a white coating is obtained;

[0075] Bio-based UV Resin B: 45 kg; UV Reactive Diluent: 15 kg Changxing Chemical EM221; Matting Agent: 4 kg Grace RAD2105; Wax Powder: 2 kg BYK CERAFLOUR1000, 3 kg BYK CERAFLOUR1010; Titanium Dioxide: 26 kg DuPont Titanium Dioxide R706; Surface Curing Photoinitiator: Photoinitiator: 2 kg Jiurixin Materials JRCure1055, 1 kg IGM Omnirad754; Deep Curing Photoinitiator: 1 kg Jiurixin Materials JRCure1109; Defoamer: 0.1 kg BYK BYK1791; Dispersant: 0.1 kg BYK BYK110, 0.5 kg Degussa Leveling Agent: 0.1 kg Dow Corning Dow

[0076] Example 4

[0077] A white coating is obtained by fully mixing the following raw material components by weight to obtain a white coating;

[0078] Bio-based UV Resin B: 40.6 kg; UV Reactive Diluent: 10 kg Changxing Chemical EM221, 15 kg Changxing Chemical EM223; Matting Agent: 2 kg Xinhui BS-2305, 2 kg Grace RAD2105; Wax Powder: 1 kg BYK CERAFLOUR1000, 2 kg BYK CERAFLOUR1010; Titanium Dioxide: 10 kg DuPont Titanium Dioxide R900, 10 kg DuPont Titanium Dioxide R706; Surface Curing Photoinitiator: Photoinitiator: 3 kg Jiurixin Materials JRCure1055, 2 kg IGM Omnirad754; Deep Curing Photoinitiator: 0.5 kg Jiurixin Materials JRCure1108, 0.5 kg Jiurixin Materials JRCure1109; Defoamer: 0.2 kg BYK BYK1791; Dispersant: 0.4 kg BYK BYK110, 0.3 kg BYK BYK2009, 0.3 kg Degussa Leveling Agent: 0.2 kg Dow Corning Dow

[0079] Comparative Example 1 [Using Bio-based Resin C]

[0080] A white coating is obtained by fully mixing the following raw material components by weight to obtain a white coating;

[0081] Bio-based UV resin C: 45 kg; UV active diluent: 15 kg Changxing Chemical EM221; Extinction powder: 4 kg Grace RAD2105; Wax powder: 2 kg BYK CERAFLOUR1000, 3 kg BYK CERAFLOUR1010; Titanium dioxide: 26 kg DuPont Titanium Dioxide R706; Surface curing photoinitiator: Photoinitiator: 2 kg Jushi New Materials JRCure1055, 1 kg IGM Omnirad754; Deep curing photoinitiator: 1 kg Jushi New Materials JRCure1109; Defoamer: 0.1 kg BYK Chemical BYK1791; Dispersant: 0.1 kg BYK Chemical BYK110, 0.5 kg Degussa Flow leveling agent: 0.1 kg Dow Corning Dow

[0082] Comparative Example 2 [Using bio-based UV resin D]

[0083] A white coating is obtained by obtaining the following weight of raw material components and then thoroughly mixing and homogenizing each raw material component to obtain a white coating;

[0084] Bio-based UV resin D: 45 kg; UV active diluent: 15 kg Changxing Chemical EM221; Extinction powder: 4 kg Grace RAD2105; Wax powder: 2 kg BYK CERAFLOUR1000, 3 kg BYK CERAFLOUR1010; Titanium dioxide: 26 kg DuPont Titanium Dioxide R706; Surface curing photoinitiator: Photoinitiator: 2 kg Jushi New Materials JRCure1055, 1 kg IGM Omnirad754; Deep curing photoinitiator: 1 kg Jushi New Materials JRCure1109; Defoamer: 0.1 kg BYK Chemical BYK1791; Dispersant: 0.1 kg BYK Chemical BYK110, 0.5 kg Degussa Flow leveling agent: 0.1 kg Dow Corning Dow

[0085] Comparative Example 3 [Using bio-based UV resin E]

[0086] A white coating is obtained by obtaining the following weight of raw material components and then thoroughly mixing and homogenizing each raw material component to obtain a white coating;

[0087] Bio-based UV resin E: 45 kg; UV active diluent: 15 kg Changxing Chemical EM221; Matting powder: 4 kg Grace RAD2105; Wax powder: 2 kg BYK CERAFLOUR1000, 3 kg BYK CERAFLOUR1010; Titanium dioxide: 26 kg DuPont Titanium Dioxide R706; Surface curing photoinitiator: Photoinitiator: 2 kg Jushi New Materials JRCure1055, 1 kg IGM Omnirad754; Deep curing photoinitiator: 1 kg Jushi New Materials JRCure1109; Defoamer: 0.1 kg BYK Chemical BYK1791; Dispersant: 0.1 kg BYK Chemical BYK110, 0.5 kg Degussa Leveling agent: 0.1 kg Dow Corning Dow

[0088] Comparative Example 4 [Using bio-based UV resin F]

[0089] A white paint is obtained by obtaining the following raw material components by weight and then thoroughly mixing and homogenizing each raw material component to obtain the white paint;

[0090] Bio-based UV resin F: 45 kg; UV active diluent: 15 kg Changxing Chemical EM221; Matting powder: 4 kg Grace RAD2105; Wax powder: 2 kg BYK CERAFLOUR1000, 3 kg BYK CERAFLOUR1010; Titanium dioxide: 26 kg DuPont Titanium Dioxide R706; Surface curing photoinitiator: Photoinitiator: 2 kg Jushi New Materials JRCure1055, 1 kg IGM Omnirad754; Deep curing photoinitiator: 1 kg Jushi New Materials JRCure1109; Defoamer: 0.1 kg BYK Chemical BYK1791; Dispersant: 0.1 kg BYK Chemical BYK110, 0.5 kg Degussa Leveling agent: 0.1 kg Dow Corning Dow

[0091] Comparative Example 5 [Low bio-based UV resin A]

[0092] A white paint is obtained by obtaining the following raw material components by weight and then thoroughly mixing and homogenizing each raw material component to obtain the white paint;

[0093] Bio-based UV Resin A: 30 kg; UV Reactive Diluent: 13.1 kg of Changxing Chemical EM221, 10 kg of Changxing Chemical EM223; Matting Agent: 4 kg of Xinhui BS-2305, 9 kg of Grace RAD2105; Wax Powder: 1 kg of BYK Chemical CERAFLOUR1000; Titanium Dioxide: 10 kg of DuPont Titanium Dioxide R900, 15 kg of DuPont Titanium Dioxide R706; Surface Curing Photoinitiator: Photoinitiator: 2 kg of Jushi New Materials JRCure1055, 3 kg of IGM Omnirad754; Deep Curing Photoinitiator: 0.5 kg of Jushi New Materials JRCure1108, 0.5 kg of Jushi New Materials JRCure1109; Defoamer: 0.1 kg of Evonik Specialty Chemicals TEGO920, 0.1 kg of BYK Chemical BYK1791; Dispersant: 0.3 kg of BYK Chemical BYK110, 0.6 kg of BYK Chemical BYK2009, 0.6 kg of Degussa Leveling Agent: 0.1 kg of Evonik Specialty Chemicals TEGO410, 0.1 kg of Dow Corning Dow

[0094]

[0095] Comparative Example 6 [High Titanium Dioxide Content]

[0096] A white coating, after obtaining the following raw material components by weight and mixing all the raw material components evenly, a white coating is obtained;

[0097] Bio-based UV Resin A: 35.3 kg; UV Reactive Diluent: 15.5 kg of Changxing Chemical EM223; Matting Agent: 7.5 kg of Xinhui BS-2305; Wax Powder: 1 kg of BYK Chemical CERAFLOUR1010; Titanium Dioxide: 35 kg of DuPont Titanium Dioxide R900; Surface Curing Photoinitiator: Photoinitiator: 4 kg of Jushi New Materials JRCure1055; Deep Curing Photoinitiator: 0.5 kg of Jushi New Materials JRCure1108; Defoamer: 0.1 kg of Evonik Specialty Chemicals TEGO920; Dispersant: 0.5 kg of BYK Chemical BYK110, 0.5 kg of BYK Chemical BYK2009; Leveling Agent: 0.1 kg of Evonik Specialty Chemicals TEGO410.

[0098] Comparative Example 7 [Low Deep Curing Photoinitiator]

[0099] A white coating, after obtaining the following raw material components by weight and mixing all the raw material components evenly, a white coating is obtained;

[0100] Bio-based UV resin A: 35.5 kg; UV active diluent: 20.5 kg Changxing Chemical EM223; matting agent: 7.5 kg Xinhui BS-2305; wax powder: 1 kg BYK Chemical CERAFLOUR1010; titanium dioxide: 30 kg DuPont Titanium Dioxide R900; surface curing photoinitiator: photoinitiator: 4 kg Jiurixin Materials JRCure1055; deep curing photoinitiator: 0.3 kg Jiurixin Materials JRCure1108; defoamer: 0.1 kg Evonik Specialty Chemicals TEGO920; dispersant: 0.5 kg BYK Chemical BYK110, 0.5 kg BYK Chemical BYK2009; leveling agent: 0.1 kg Evonik Specialty Chemicals TEGO410.

[0101] Comparative Example 8 [High content of bio-based UV resin B]

[0102] A white coating is obtained by fully mixing the following raw material components by weight and then uniformly mixing them to obtain a white coating;

[0103] Bio-based UV resin B: 50 kg; UV active diluent: 15 kg Changxing Chemical EM221; matting agent: 4 kg Grace RAD2105; wax powder: 2 kg BYK Chemical CERAFLOUR1000, 3 kg BYK Chemical CERAFLOUR1010; titanium dioxide: 21 kg DuPont Titanium Dioxide R706; surface curing photoinitiator: photoinitiator: 2 kg Jiurixin Materials JRCure1055, 1 kg IGM Omnirad754; deep curing photoinitiator: 1 kg Jiurixin Materials JRCure1109; defoamer: 0.1 kg BYK Chemical BYK1791; dispersant: 0.1 kg BYK Chemical BYK110, 0.5 kg Degussa Leveling agent: 0.1 kg Dow Corning

[0104] Comparative Example 9 [Low content of UV active diluent]

[0105] A white coating is obtained by fully mixing the following raw material components by weight and then uniformly mixing them to obtain a white coating;

[0106] Bio-based UV Resin B: 50 kg; UV Reactive Diluent: 10 kg Changxing Chemical EM221; Matting Agent: 4 kg Grace RAD2105; Wax Powder: 2 kg BYK CERAFLOUR1000, 3 kg BYK CERAFLOUR1010; Titanium Dioxide: 26 kg DuPont Titanium Dioxide R706; Surface Curing Photoinitiator: Photoinitiator: 2 kg Jiurixin Cai JRCure1055, 1 kg IGM Omnirad754; Deep Curing Photoinitiator: 1 kg Jiurixin Cai JRCure1109; Defoamer: 0.1 kg BYK BYK1791; Dispersant: 0.1 kg BYK BYK110, 0.5 kg Degussa Leveling Agent: 0.1 kg Dow Corning Dow

[0107] Comparative Example 10 [Low Dispersant]

[0108] A white paint is obtained by fully mixing the following raw material components by weight to obtain a white paint;

[0109] Bio-based UV Resin B: 45 kg; UV Reactive Diluent: 15 kg Changxing Chemical EM221; Matting Agent: 4 kg Grace RAD2105; Wax Powder: 2 kg BYK CERAFLOUR1000, 3 kg BYK CERAFLOUR1010; Titanium Dioxide: 26.2 kg DuPont Titanium Dioxide R706; Surface Curing Photoinitiator: Photoinitiator: 2 kg Jiurixin Cai JRCure1055, 1 kg IGM Omnirad754; Deep Curing Photoinitiator: 1 kg Jiurixin Cai JRCure1109; Defoamer: 0.1 kg BYK BYK1791; Dispersant: 0.1 kg BYK BYK110, 0.3 kg Degussa Leveling Agent: 0.1 kg Dow Corning Dow

[0110] Comparative Example 11 [High UV Reactive Diluent]

[0111] A white paint is obtained by fully mixing the following raw material components by weight to obtain a white paint;

[0112] Bio-based UV resin B: 35.6 kg; UV active diluent: 15 kg of Changxing Chemical EM221, 15 kg of Changxing Chemical EM223; Matting agent: 2 kg of Xinhui BS-2305, 2 kg of Grace RAD2105; Wax powder: 1 kg of BYK Chemical CERAFLOUR1000, 2 kg of BYK Chemical CERAFLOUR1010; Titanium dioxide: 10 kg of DuPont Titanium Dioxide R900, 10 kg of DuPont Titanium Dioxide R706; Surface curing photoinitiator: Photoinitiator: 3 kg of Jushi New Materials JRCure1055, 2 kg of IGM Omnirad754; Deep curing photoinitiator: 0.5 kg of Jushi New Materials JRCure1108, 0.5 kg of Jushi New Materials JRCure1109; Defoamer: 0.2 kg of BYK Chemical BYK1791; Dispersant: 0.4 kg of BYK Chemical BYK110, 0.3 kg of BYK Chemical BYK2009, 0.3 kg of Degussa Leveling agent: 0.2 kg of Dow Corning Dow

[0113] Comparative Example 12 [No yellowing-resistant surface curing photoinitiator was used]

[0114] A white paint is obtained by fully mixing the following raw material components by weight to obtain the white paint;

[0115] Bio-based UV resin A: 35 kg; UV active diluent: 13.1 kg of Changxing Chemical EM221, 10 kg of Changxing Chemical EM223; Matting agent: 4 kg of Xinhui BS-2305, 9 kg of Grace RAD2105; Wax powder: 1 kg of BYK Chemical CERAFLOUR1000; Titanium dioxide: 10 kg of DuPont Titanium Dioxide R900, 10 kg of DuPont Titanium Dioxide R706; Surface curing photoinitiator: Photoinitiator: 4 kg of Jushi New Materials JRCure1104; Deep curing photoinitiator: 0.5 kg of Jushi New Materials JRCure1108, 0.5 kg of Jushi New Materials JRCure1109; Defoamer: 0.1 kg of Evonik Specialty Chemicals TEGO920, 0.1 kg of BYK Chemical BYK1791; Dispersant: 0.3 kg of BYK Chemical BYK110, 0.6 kg of BYK Chemical BYK2009, 0.6 kg of Degussa Leveling agent: 0.1 kg of Evonik Specialty Chemicals TEGO410, 0.1 kg of Dow Corning Dow Performance test

[0116] The white coatings obtained in Examples 1-4 and Comparative Examples 1-12 were tested using GB / T 1730-1993, GB / T 9286-2021, and HG / T 3655-2024 standards, and were applied using a roller coater and then cured under irradiation with a 1 gallium 2 mercury lamp (curing energy: UVV 500-550 mj / cm2, UVA 500-550 mj / cm2). The results are shown in Tables 1 to 4, where the hardness was tested using a pencil method, and the hot and cold cycles were -20°C, 2h; 50°C, 2h, repeated five times.

[0117] Table 1 Performance test results of white coatings obtained in Examples 1 to 4

[0118] Item Example 1 Example 2 Example 3 Example 4 Appearance White viscous liquid White viscous liquid White viscous liquid White viscous liquid Bio-based carbon content / % 22.7 24.6 42.3 31.9 Viscosity (25°C, Stormer) 74 KU 70 KU 75 KU 69 KU Curing performance Passed Passed Passed Passed Surface effect Good Good Good Good Defoaming property Good Good Good Good Fineness 25 μm 25 μm 25 μm 25 μm Storage stability 8 8 8 8 Hardness H H H H Cross-cut test Grade 1 Grade 1 Grade 1 Grade 1 Gloss / G60° 10-13％ 38-42％ 38-42％ 45-50％ Dry heat resistance Grade 1 Grade 1 Grade 1 Grade 1 Damp heat resistance Grade 2 Grade 2 Grade 1 Grade 2 Water resistance Grade 1 Grade 1 Grade 1 Grade 1 Alcohol resistance Grade 1 Grade 1 Grade 1 Grade 1 Alkali resistance Grade 2 Grade 1 Grade 1 Grade 1 Pollution resistance Grade 2 Grade 2 Grade 1 Grade 1 Yellowing resistance 1.42 1.26 1.18 1.34 Thermal shock resistance Qualified Qualified Qualified Qualified

[0119] Table 2 Performance test results of white coatings obtained in Comparative Examples 1 to 4

[0120] Item Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Appearance White viscous liquid White viscous liquid White viscous liquid White viscous liquid Bio-based carbon content / % 7.7 68.6 40.9 41.6 Viscosity (25°C, Stormer) 78 KU 85 KU 76 KU 76 KU Curing performance Passed Failed Passed Failed Surface effect Good Bad Good Good Defoaming property Good Good Good Good Fineness 25 μm 25 μm 25 μm 25 μm Storage stability 8 8 8 8 Hardness H 2B 2H B Cross-cut test Grade 1 Grade 1 Grade 1 Grade 1 Gloss 42-46％ 15-18％ 48-52％ 16-19％ Dry heat resistance Grade 1 Grade 3 Grade 1 Grade 3 Damp heat resistance Grade 1 Grade 4 Grade 1 Grade 4 Water resistance Grade 1 Grade 3 Grade 1 Grade 3 Alcohol resistance Grade 1 Grade 3 Grade 1 Grade 3 Alkali resistance Grade 1 Grade 4 Grade 1 Grade 4 Pollution resistance Grade 2 Grade 4 Grade 2 Grade 4 Yellowing resistance 5.2 4.5 4.8 1.14 Thermal shock resistance Qualified Qualified Qualified Qualified

[0121] Table 3 Performance test results of white coatings obtained in Comparative Examples 5 to 8

[0122] Item Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Appearance White viscous liquid White viscous liquid White viscous liquid White viscous liquid Bio-based carbon content / % 21.3 26.8 24.9 42.8 Viscosity (25°C, Stormer) 70 KU 74 KU 65 KU 85 KU Curing performance Failed Passed Passed Passed Surface effect Good Good Good Bad Defoaming property Good Good Good Good Fineness 25 μm 25 μm 25 μm 25 μm Storage stability 8 8 8 8 Hardness HB H H H Cross-cut test Grade 1 Grade 3 Grade 3 Grade 1 Gloss 7-10％ 40-43％ 42-45％ 42-45％ Dry heat resistance Grade 3 Grade 1 Grade 1 Grade 1 Damp heat resistance Grade 4 Grade 2 Grade 2 Grade 1 Water resistance Grade 3 Grade 1 Grade 1 Grade 1 Alcohol resistance Grade 3 Grade 1 Grade 1 Grade 1 Alkali resistance Grade 3 Grade 2 Grade 1 Grade 1 Pollution resistance Grade 4 Grade 3 Grade 2 Grade 1 Yellowing resistance 1.35 1.05 1.26 1.15 Thermal shock resistance Qualified Unqualified Unqualified Qualified

[0123] Table 4 Performance test results of white coatings obtained in Comparative Examples 9 to 12

[0124] Item Comparative Example 9 Comparative Example 10 Comparative Example 11 Comparative Example 12 Appearance White viscous liquid White viscous liquid White viscous liquid White viscous liquid Bio-based carbon content / % 45.1 42.4 28.5 22.7 Viscosity (25°C, Stormer) 83 KU 84 KU 66 KU 74 KU Curing performance Passed Passed Failed Passed Surface effect Bad Bad Good Good Defoaming property Good Good Good Good Fineness 25 μm 25 μm 25 μm 25 μm Storage stability 8 8 8 8 Hardness H H B H Cross-cut test Grade 1 Grade 1 Grade 1 Grade 1 Gloss 44-46％ 38-42％ 39-42％ 10-13％ Dry heat resistance Grade 1 Grade 1 Grade 3 Grade 1 Damp heat resistance Grade 1 Grade 1 Grade 4 Grade 2 Water resistance Grade 1 Grade 1 Grade 3 Grade 1 Alcohol resistance ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1.06 1.18 1.44 3.2 ​ ​ ​ ​ ​

[0125] As can be seen from Tables 1 to 4, the white coating provided by the present invention first prepares a bio-based UV resin, and through the joint action of each component, the bio-based carbon content of the self-made bio-based UV resin is between 40-50%, the curing performance is good, and the resin odor is extremely low, and the yellowing resistance is excellent. Secondly, a white coating is prepared, and through the joint action of each component, the white coating is completely cured under the irradiation of a gallium lamp and two mercury lamps, and at the same time, the bio-based carbon content in the coating film of the white coating is ≥22%, and the coating film resistance meets the requirements of the HG / T3655-2024 ultraviolet (UV) curing wood coating industry standard; finally, the yellowing resistance of the UV white coating (equipment: QUV ultraviolet aging machine, wavelength: UVA-340, temperature: 60°C, irradiance: 0.68W / m2, time: 168h) ΔE is not higher than 1.5.

[0126] Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4 are different from Example 3 in that whether bio-based dodecanedioic acid, alicyclic epoxy resin, alicyclic epoxy resin, and glycidyl acrylate are replaced with phthalic acid, epoxidized soybean oil, E51 epoxy resin, and glycidyl methacrylate, respectively, when preparing the bio-based UV resin; for the scheme of replacing phthalic acid with bio-based dodecanedioic acid, the film adhesion is grade 1, and the properties such as film hardness, dry heat resistance, damp heat resistance, water resistance, alkali resistance, alcohol resistance, and stain resistance meet the requirements of HG / T 3655-2024 standard. The film has a low odor, and other properties also meet the requirements. However, its bio-based carbon content is only 7.7%, and the yellowing resistance is poor; for the scheme of replacing alicyclic epoxy resin with epoxidized soybean oil, the bio-based carbon content of the white coating is 68.6%, the film adhesion is grade 3, the film has a strong odor, the film curing performance fails, the surface effect of the film is poor, and the properties such as film hardness, dry heat resistance, damp heat resistance, water resistance, alkali resistance, alcohol resistance, and stain resistance cannot meet the requirements of HG / T 3655-2024 standard. Moreover, the film has a strong odor and poor yellowing resistance; for the scheme of replacing alicyclic epoxy resin with E51 epoxy resin, the film adhesion is grade 1, the bio-based carbon content of the white coating is 40.9%, the film curing performance passes, the surface effect of the film is good, and the properties such as film hardness, dry heat resistance, damp heat resistance, water resistance, alkali resistance, alcohol resistance, and stain resistance meet the requirements of HG / T 3655-2024 standard. And the film has a low odor, but the yellowing resistance is poor; for the scheme of replacing glycidyl acrylate with glycidyl methacrylate, the bio-based carbon content of the white coating is 41.6%, the surface effect of the film is good, the film adhesion is grade 3, the film has a strong odor, the film has good yellowing resistance, but the film curing performance fails, and the properties such as film hardness, dry heat resistance, damp heat resistance, water resistance, alkali resistance, alcohol resistance, and stain resistance cannot meet the requirements of HG / T 3655-2024 standard; for the scheme of obtaining the first product with the molar ratio of bio-based diacid fatty acid to alicyclic epoxy resin being (2.1-2.5):1 and the molar ratio of glycidyl acrylate to the first product being (1.9-2.2):1, the film adhesion is grade 1, and the properties such as hardness, dry heat resistance, damp heat resistance, water resistance, alkali resistance, alcohol resistance, and stain resistance also meet the requirements of HG / T 3655-2024 standard. The film has a low odor, and its bio-based carbon content reaches 42%. Other properties also meet the requirements, and the yellowing resistance is good. It shows that the bio-based carbon of the self-made bio-based UV resin comes from bio-based dibasic fatty acids, and through the compounding effect of the molar ratio among bio-based dibasic fatty acids, aliphatic epoxy resins, and glycidyl acrylate, the bio-based carbon content of the self-made bio-based UV resin is between 40-50%, the curing performance is good, the resin has a low odor, and the yellowing resistance is excellent.

[0127] The difference between Example 5 and Example 1 is whether the amount of bio-based UV resin added is less than 35%, the difference between Example 11 and Example 4 is whether the amount of UV active diluent added is more than 25%, the difference between Example 13 and Example 1 is whether bio-based wax powder is added, and the difference between Example 14 and Example 3 is whether the surface curing photoinitiator is less than 3%, and the amount of bio-based UV resin added is less than 35%. The coating has low odor and good yellowing resistance. The bio-based carbon content is 21.3%. The coating curing performance passes, but the coating hardness, moisture and heat resistance, alkali resistance, alcohol resistance, pollution resistance and other properties are not satisfactory. It meets the requirements of HG / T3655-2024 standard, and other properties also meet the requirements, indicating that bio-based UV resin has a promoting effect on the resistance of white coatings, and its addition amount should not be less than 35%; the addition amount of UV active diluent exceeds 25%, or no bio-based wax powder is added, or the surface curing photoinitiator is less than 3%, the yellowing resistance is good, and the bio-based carbon content is 28.5%, 22.4%, and 42.7% respectively, but the coating curing performance is not passed, the coating has a strong odor, and the coating hardness, dry heat resistance, wet heat resistance, water resistance, alkali resistance, alcohol resistance, pollution resistance and other properties cannot meet HG / T 3655-2024 standard requirements, other properties also meet the requirements; it shows that UV active diluents have a negative effect on curing performance, while bio-based wax powder and surface curing photoinitiator have a promoting effect on curing performance, the addition amount of UV active diluent should not be greater than 30%, the addition amount of bio-based wax powder should not be less than 1%, the addition amount of surface curing photoinitiator should not be less than 3%, and the poor curing performance of the white paint film will lead to a strong odor of the film; combined with the experimental results of Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4 and Example 3, Comparative Example 5 and Example 1, Comparative Example 11 and Example 4, Comparative Example 13 and Example 1, Comparative Example 14 and Example 3, it shows that the resistance of the white paint film is jointly affected by the bio-based UV resin (compounded between bio-based dibasic fatty acids, aliphatic epoxy resin and glycidyl acrylate), UV active diluent, wax powder and surface curing photoinitiator.

[0128] The difference between Comparative Example 6 and Example 2 lies in whether the titanium dioxide addition amount exceeds 30%. The difference between Comparative Example 7 and Example 2 lies in whether the deep-curing photoinitiator addition amount is lower than 0.5%. For the solution with the titanium dioxide addition amount exceeding 30%, the yellowing resistance performance is good, the bio-based carbon content is 24.9% respectively, the film curing performance passes, the film odor is low, and the film hardness, dry heat resistance, damp heat resistance, water resistance, alkali resistance, alcohol resistance, stain resistance and other performances all meet the requirements of HG / T 3655-2024 standard, the adhesion is grade 3, and other performances also meet the requirements; for the solution with the deep-curing photoinitiator addition amount lower than 0.5%, the yellowing resistance performance is good, the bio-based carbon content is 24.9% respectively, the film curing performance passes, the film odor is low, and the film hardness, dry heat resistance, damp heat resistance, water resistance, alkali resistance, alcohol resistance, stain resistance and other performances all meet the requirements of HG / T 3655-2024 standard, the adhesion is grade 3, and other performances also meet the requirements; for the solution with the titanium dioxide addition amount less than or equal to 30% and the deep-curing photoinitiator addition amount greater than or equal to 0.5%, the film adhesion is grade 1, the hardness, dry heat resistance, damp heat resistance, water resistance, alkali resistance, alcohol resistance, stain resistance and other performances also meet the requirements of HG / T 3655-2024 standard, the film odor is low, and its bio-based carbon content reaches 42%, other performances also meet the requirements, and the yellowing resistance performance is good, indicating that the titanium dioxide addition amount of the white coating should be less than or equal to 30% and the deep-curing photoinitiator addition amount should be greater than or equal to 0.5%. Combining the results of Comparative Example 2 and Example 3, and Comparative Example 4 and Example 3, it shows that the film adhesion of the white coating is affected by the compounding of bio-based UV coating (compound synthesis between bio-based dibasic fatty acid, aliphatic epoxy resin and glycidyl acrylate), titanium dioxide and deep-curing photoinitiator.

[0129] The difference between Comparative Example 8 and Example 3 lies in whether the addition amount of the self-made bio-based UV resin exceeds 45%. The difference between Comparative Example 9 and Example 3 lies in whether the UV active diluent is less than 15%. The difference between Comparative Example 10 and Example 3 lies in whether the matting powder dispersant is less than 0.5%. For the scheme where the self-made bio-based UV resin exceeds 45%, the surface effect is poor, the film adhesion is grade 1, and the properties such as hardness, dry heat resistance, damp heat resistance, water resistance, alkali resistance, alcohol resistance, and stain resistance also meet the requirements of HG / T 3655-2024 standard. The film has a low odor, and its bio-based carbon content reaches 42.8%. Other properties also meet the requirements, and the yellowing resistance is good. For the scheme where the UV active diluent is less than 15%, the surface effect is poor, the film adhesion is grade 1, and the properties such as hardness, dry heat resistance, damp heat resistance, water resistance, alkali resistance, alcohol resistance, and stain resistance also meet the requirements of HG / T 3655-2024 standard. The film has a low odor, and its bio-based carbon content reaches 45.1%. Other properties also meet the requirements, and the yellowing resistance is good. For the scheme where the matting powder dispersant is less than 0.5%, the surface effect is poor, the film adhesion is grade 1, and the properties such as hardness, dry heat resistance, damp heat resistance, water resistance, alkali resistance, alcohol resistance, and stain resistance also meet the requirements of HG / T 3655-2024 standard. The film has a low odor, and its bio-based carbon content reaches 42.4%. Other properties also meet the requirements, and the yellowing resistance is good. For the scheme where the addition amount of the self-made bio-based UV resin is less than or equal to 45%, the UV active diluent is greater than or equal to 15%, and the matting powder dispersant is greater than or equal to 0.5%, the surface effect is good, the film adhesion is grade 1, and the properties such as hardness, dry heat resistance, damp heat resistance, water resistance, alkali resistance, alcohol resistance, and stain resistance also meet the requirements of HG / T 3655-2024 standard. The film has a low odor, and its bio-based carbon content reaches 42.3%. Other properties also meet the requirements, and the yellowing resistance is good. It shows that the addition amount of the self-made bio-based UV resin in the white coating should be less than or equal to 45%, the addition amount of the UV active diluent should be greater than or equal to 15%, and the addition amount of the matting powder dispersant should be greater than or equal to 0.5%. Combining with the results of Comparative Example 2 and Example 3, it shows that the surface of the white coating film is affected by the compounding of the bio-based UV coating (compounded between bio-based dibasic fatty acids, aliphatic epoxy resins, and glycidyl acrylate), the UV active diluent, and the matting powder dispersant.

[0130] Comparative Example 12 The difference between Example 1 is whether to use Jiuri New Material JRCure1104 to replace Jiuri New Material JRCure1055 or IGM Omnirad754. The Jiuri New Material JRCure1104 solution has good surface effect, the coating adhesion is level 1, and the hardness, dry heat resistance, wet heat resistance, water resistance, alkali resistance, alcohol resistance, pollution resistance and other properties also meet the requirements of HG / T 3655-2024 standard. The coating has low odor, and its bio-based carbon content reaches 22.7%. Other properties also meet the requirements, and the yellowing resistance is poor. Omnirad754 solution has good surface effect, coating adhesion level 1, hardness, dry heat resistance, wet heat resistance, water resistance, alkali resistance, alcohol resistance, pollution resistance and other properties also meet the requirements of HG / T3655-2024 standard, the coating has low odor, and its bio-based carbon content reaches 22.7%, other properties also meet the requirements, and the yellowing resistance is good, indicating that the white coating cannot use Jiuri New Material JRCure1104, that is, use Jiuri New Material JRCure1055 and IGMOmnirad754 at least one; combined with the results of Comparative Example 1, Comparative Example 2, Comparative Example 3 and Example 3, it is shown that the yellowing resistance of the white coating is affected by the compounding of bio-based UV coating (compounded between bio-based dibasic fatty acids, aliphatic epoxy resins and glycidyl acrylate) and surface curing photoinitiator

[0131] In summary, the present invention provides a white coating, and a method for preparing a bio-based UV resin is provided in the first aspect. The prepared bio-based UV resin is carried out in two steps. The first step is to react a bio-based dibasic fatty acid with an alicyclic epoxy resin to obtain a first product. The second step is to react glycidyl acrylate with the first product to obtain a bio-based UV resin. The bio-based carbon content is between 40-50%, and the resin has a fast curing speed, low odor, and excellent yellowing resistance. The second aspect provides a method for preparing white coating, wherein the prepared bio-based UV resin, UV active diluent, matting powder, wax powder, titanium dioxide, photoinitiator, defoamer, dispersant and leveling agent are compounded, so that the white coating is suitable for roller coating construction and the white coating film is completely cured under the conditions of one gallium lamp and two mercury lamps, the coating film has extremely low odor, the coating film gloss is between 10-70%, the coating film resistance meets the requirements of HG / T 3655-2024 ultraviolet (UV) curing wood coating industry standard, and the coating film is resistant to yellowing (equipment: QUV ultraviolet aging machine, wavelength: UVA-340, temperature: 60°C, irradiance: 0.68W / m2, time: 168h) ΔE is not higher than 1.5. Among them; the wax powder is a bio-based wax powder, which can adjust the surface curing of the coating film and increase the bio-based carbon content of the white coating; the prepared bio-based UV resin, UV active diluent and matting powder dispersant can adjust the coating viscosity and fluidity, so that the white coating is suitable for roller coating construction.

[0132] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed or recorded in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0133] The above-described embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them; although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the embodiments of the present application.

Claims

1. A preparation method of a white coating, characterized in that, It includes the following steps: Prepare a bio-based UV resin; Obtain the following raw materials by weight: 35 to 50 parts of the bio-based UV resin, 20 to 30 parts of a UV active diluent, 4 to 13 parts of a matting powder, 1 to 2 parts of a wax powder, 20 - 30 parts of titanium dioxide, 4 to 6 parts of a photoinitiator, 0.1 to 0.2 parts of an antifoaming agent, 1.0 to 1.5 parts of a dispersant, and 0.1 to 0.2 parts of a leveling agent; Mix the above raw materials to obtain the white coating; Wherein the bio-based carbon content in the bio-based UV resin is 40% to 50%.

2. The preparation method according to claim 1, wherein The preparation of the bio-based UV resin includes the following steps: Mix a bio-based dibasic fatty acid, an alicyclic epoxy resin, triethylamine, hypophosphorous acid, and 2,6 - di-tert-butyl-p-cresol, and carry out a first reaction to obtain a first product; Mix glycidyl acrylate, triethylamine, p-methoxyphenol, 2,6 - di-tert-butyl-p-cresol, and the first product, and carry out a second reaction to obtain the bio-based UV resin.

3. The preparation method according to claim 2, characterized in that, The conditions of the first reaction include: reacting for 6 to 7 hours under the condition of a temperature of 110°C to 120°C; And / or, the steps of the second reaction include: mixing glycidyl acrylate, the triethylamine, the p-methoxyphenol, and the 2,6 - di-tert-butyl-p-cresol, heating to 40°C to 50°C, holding for 0.5 to 1 hour, adding the first product, and reacting for 2 to 4 hours under the condition of a temperature of 110°C to 120°C.

4. The preparation method according to claim 2 or 3, characterized in that The bio-based dibasic fatty acid includes at least one of bio-based sebacic acid and bio-based dodecanedioic acid; And / or, the molar ratio of the bio-based dibasic fatty acid to the alicyclic epoxy resin is (2.0 to 2.5):1; And / or, the molar ratio of glycidyl acrylate to the first product is (2.0 to 2.5):1; And / or, in the reaction system at the initial stage of the first reaction: The mass percentage content of triethylamine is 0.1% to 0.2%; The mass percentage content of hypophosphorous acid is 0.1% to 0.3% The mass percentage content of 2,6 - di-tert-butyl-p-cresol is 0.05% to 0.2%; And / or, in the reaction system at the initial stage of the second reaction: The mass percentage content of triethylamine is 0.1% to 0.3%; The mass percentage content of p-methoxyphenol is 0.1% to 0.5%; The mass percentage content of 2,6 - di-tert-butyl-p-cresol is 0.05% to 0.5%.

5. The preparation method according to claim 4, wherein The UV active diluent is selected from bifunctional acrylic monomers; And / or, the matting powder is selected from at least one of Grace RAD2105 and Xinhui BS - 2305; And / or, the wax powder is selected from at least one of BYK CERAFLOUR1000 and CERAFLOUR1010; And / or, the surface curing photoinitiator is selected from at least one of methyl benzoylformate and phenylbis(2,4,6 - trimethylbenzoyl)phosphine oxide; And / or, the deep curing photoinitiator is selected from at least one of 2,4,6 - trimethylbenzoyl - diphenylphosphine oxide and ethyl 2,4,6 - trimethylbenzoyl phenylphosphonate; And / or, the defoaming agent is selected from at least one of Evonik Specialty Chemicals TEGO920 and BYK Chemie BYK1791; and / or, the dispersant is selected from at least one of BYK110 of BYK Chemie, BYK2009 of BYK Chemie, and Disperbyk ; and / or, the leveling agent is selected from at least one of Evonik Specialty Chemicals TEGO410 and Dow Corning ​ 6. The preparation method according to claim 5, characterized in that, The bifunctional acrylic monomer is selected from at least one of 1,6 - hexanediol diacrylate and dipropylene glycol diacrylate; And / or, the matting powder is selected from at least one of Grace RAD2105 and Xinhui BS - 2305; And / or, the wax powder is selected from at least one of BYK Chemie CERAFLOUR1000 and CERAFLOUR1010; And / or, the surface - curing photoinitiator is selected from at least one of methyl benzoylformate and phenylbis(2,4,6 - trimethylbenzoyl)phosphine oxide; And / or, the deep - curing photoinitiator is selected from at least one of 2,4,6 - trimethylbenzoyl - diphenylphosphine oxide and ethyl 2,4,6 - trimethylbenzoyl phenylphosphonate; And / or, the defoaming agent is selected from at least one of Evonik Specialty Chemicals TEGO920 and BYK Chemie BYK1791; and / or, the dispersant is selected from at least one of BYK 110 of BYK Chemie, BYK 2009 of BYK Chemie, and Disperbyk ; And / or, the leveling agent is selected from at least one of Evonik Specialty Chemicals TEGO410 and Dow Corning Dow in the above.

7. The preparation method according to any one of claims 1 to 6, characterized in that, The bio - based carbon content in the white coating is ≥20%; 8. A white coating prepared by the preparation method according to any one of claims 1 to 7, characterized in that, The white coating comprises the following components in parts by weight: Bio - based UV resin: 35 parts to 50 parts; UV - active diluent: 15 parts to 25 parts; Matting powder: 4 parts to 13 parts; Wax powder: 1 part to 2 parts; Titanium dioxide: 20 - 30 parts; Photoinitiator: 4 parts to 6 parts; Defoaming agent: 0.1 part to 0.2 part; Dispersant: 1.0 part to 1.5 part; Leveling agent: 0.1 part to 0.2 part; Wherein the bio - based carbon content in the bio - based UV resin is 40% - 50%.

9. A UV white coating film, characterized in that, The UV white coating film is prepared by using the white coating as described in claim 8, applying it by a roller coater and then curing it with one gallium lamp and two mercury lamps.

10. The UV white coating film according to claim 9, wherein, The bio - based carbon content in the UV white coating film is ≥20%; And / or, the degree of yellowing ΔE of the UV white coating film under preset test conditions is ≤1.5.

Images