Antioxidant UV curing coating and preparation method thereof

Abstract

The invention relates to an antioxidant UV curing coating and a preparation method thereof, and belongs to the technical field of high polymer materials. The antioxidant UV curing coating comprises the following components in parts by weight: 90-110 parts of epoxy acrylate resin, 40-70 parts of methyl methacrylate, 25-50 parts of a diluent, 3-5 parts of talcum powder, 1-5 parts of a modified antioxidant, 1-3 parts of a modified flame retardant, 2-8 parts of a photoinitiator, 0.5-1 part of a flatting agent, 1-3 parts of a defoaming agent and 1-3 parts of a dispersing agent, the anti-oxidation UV curing coating prepared by the invention not only has good thermal oxidation resistance and toughening effects, but also has an excellent flame retardant effect.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, specifically relating to an antioxidant UV-curable coating and its preparation method. Background Technology

[0002] Ultraviolet (UV) curing coatings, also known as light-curing coatings, are a new type of coating that can quickly cross-link and cure into a film under light irradiation. With its characteristics of fast curing speed, no volatile solvents, energy saving and low consumption, and automated production, it has become a green and environmentally friendly coating and is widely used in plastic decoration, coating of metal and glass parts, medical devices, electronic components, information recording media and optical fibers.

[0003] However, traditional UV-curable coatings suffer from insufficient high-temperature resistance, high brittleness, and poor impact resistance, resulting in reduced coating performance and severely limiting their application in high-temperature environments. In addition, although traditional UV-curable coatings have certain flame-retardant properties, their flame-retardant properties are no longer sufficient to meet current needs as practical applications become increasingly demanding. Therefore, the development of UV-curable coatings with excellent antioxidant properties has significant practical importance and application value. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides an antioxidant UV-curable coating and its preparation method.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] An antioxidant UV-curable coating and its preparation method, comprising the following raw materials in parts by weight: 90-110 parts epoxy acrylate resin, 40-70 parts methyl methacrylate, 25-50 parts diluent, 3-5 parts talc, 1-5 parts modified antioxidant, 1-3 parts modified flame retardant, 2-8 parts photoinitiator, 0.5-1 part leveling agent, 1-3 parts defoamer, and 1-3 parts dispersant;

[0007] The diluent is polyethylene glycol dimethacrylate;

[0008] The photoinitiator is photoinitiator 184;

[0009] The leveling agent mentioned is BYK-UV3500;

[0010] The defoamer mentioned is BYK-1794;

[0011] The dispersant is BYK-2013.

[0012] The modified antioxidant is prepared by the following method:

[0013] Step A1: Mix 2-(2-hydroxy-3,5-di-tert-pentylphenyl)benzotriazole and toluene, heat to 60°C, then add 4-maleimide butyric acid and triethylamine and mix well. React at 80°C for 4-5 hours. After the reaction is complete, filter, wash, and vacuum dry to obtain the compound.

[0014] Furthermore, the ratio of 2-(2-hydroxy-3,5-di-tert-pentylphenyl)benzotriazole, toluene, 4-maleimide butyric acid, and triethylamine is 0.01-0.03 mol: 13-15 mL: 0.01-0.03 mol: 2-6 mL;

[0015] The compound was prepared by reacting the hydroxyl group of 2-(2-hydroxy-3,5-di-tert-pentylphenyl)benzotriazole with the carboxyl group of 4-maleimidebutyric acid.

[0016] Step A2: Mix itaconic acid, 4,4-dihydroxydiphenyl sulfone, p-toluenesulfonic acid and p-hydroxyanisole evenly, react at 150°C for 2 hours under nitrogen protection, then add dibutyltin dilaurate, vacuum distill at 150°C for 2 hours, cool to 100°C, dry, and obtain the preproduct.

[0017] Furthermore, the ratio of itaconic acid, 4,4-dihydroxydiphenyl sulfone, p-toluenesulfonic acid, p-hydroxyanisole, and dibutyltin dilaurate is 0.01-0.03 mol: 0.01-0.03 mol: 2-6 g: 4-6 g: 2-6 mL;

[0018] Secondly, the preproduct was prepared by reacting the carboxyl group of itaconic acid with the hydroxyl group of 4,4-dihydroxydiphenyl sulfone.

[0019] Step A3: Disperse the compound and benzoyl peroxide evenly in xylene, then add the preproduct and stir evenly. Under nitrogen protection, heat to 90℃ and react for 4.5h. Distill under reduced pressure, cool, wash, filter, and vacuum dry to obtain the modified antioxidant.

[0020] Furthermore, the ratio of the compound, benzoyl peroxide, xylene, and preproduct is 0.01-0.03 mol: 0.16 g: 50-60 mL: 0.01-0.03 mol;

[0021] Finally, modified antioxidants were prepared by copolymerizing the carbon-carbon double bonds of the compound and the preproduct.

[0022] The modified flame retardant is prepared by the following method:

[0023] Step B1: 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and γ-glycidyl etheroxypropyltrimethoxysilane were mixed evenly at 130°C, and then N,N-dimethylacetamide was added. The temperature was raised to 130-140°C and the mixture was stirred for 3 hours. After the reaction was completed, the intermediate was obtained by vacuum distillation, washing, and vacuum drying.

[0024] Furthermore, the ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, γ-glycidyl etheroxypropyltrimethoxysilane, and N,N-dimethylacetamide is 0.01-0.03 mol: 0.01-0.03 mol: 30-50 mL;

[0025] The intermediate was prepared by reacting the epoxy groups of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and γ-glycidyl etheroxypropyltrimethoxysilane.

[0026] Step B2: Add the intermediate to an ethanol-water mixture and mix at 35°C for 10 min. Then add phenyl dichlorophosphate, tetrahydrofuran and triethylamine and mix evenly. Stir and react at 120-150°C for 4 h. After the reaction is complete, vacuum filter, rotary evaporate and vacuum dry to obtain the modified flame retardant.

[0027] Furthermore, the ratio of the intermediate, ethanol-water mixed solution, phenyl dichlorophosphate, tetrahydrofuran, and triethylamine is 0.02-0.04 mol: 150 mL: 0.03-0.06 mol: 50 mL: 30 g, and the volume ratio of ethanol to water in the ethanol-water mixed solution is 4:1.

[0028] Finally, the modified flame retardant was prepared by reacting the silanol groups generated from the hydrolysis of the intermediate with the chlorine atoms of phenyl dichlorophosphate.

[0029] A method for preparing an antioxidant UV-curable coating specifically includes the following steps:

[0030] S1. Mix epoxy acrylate resin, methyl methacrylate and diluent evenly, and stir at 800-1000 rpm for 5-10 min to obtain pretreated material;

[0031] S2. Add talc, modified antioxidant, modified flame retardant, photoinitiator, leveling agent, defoamer and dispersant to the pretreatment material, stir at 1000-1200 rpm for 30-50 min, filter, and obtain antioxidant UV-cured coating by UV curing mechanism.

[0032] The beneficial effects of this invention are:

[0033] The antioxidant UV-curable coating of the present invention has good heat oxidation resistance and toughening effect, and also has excellent flame retardant effect, further extending its service life.

[0034] The maleimide group in the modified antioxidant prepared by this invention, due to its flexibility, can enhance the flexibility of the epoxy acrylate resin molecular chain, forming an interpenetrating network structure, effectively alleviating stress concentration, improving material toughness, and accelerating the curing of epoxy acrylate resin. Simultaneously, this group can also enhance intermolecular forces, increasing the material's glass transition temperature, melting point, and heat resistance, thus enhancing its antioxidant properties. Furthermore, 2-(2-hydroxy-3,5-di-tert-pentylphenyl)benzotriazole, with its conjugated double bonds and aromatic ring, can efficiently absorb ultraviolet light, triggering internal thermal vibrations within the molecule. By breaking internal hydrogen bonds, the energy of ultraviolet light is converted into heat or light energy, significantly reducing the damage of ultraviolet rays to materials. Sulfone groups, as strong electron-withdrawing groups, can reduce the electron cloud density of bonded carbon atoms, enhance molecular thermal stability, and restrict molecular chain movement through chain extension, further improving heat resistance. In addition, itaconic acid, as a bio-based platform compound, is derived from renewable resources, combining environmental protection and sustainability. It can also reduce the shrinkage rate of epoxy acrylate resin during UV curing, effectively inhibit crack propagation, enhance bond strength, further improve toughness, and extend service life.

[0035] The modified flame retardant prepared by this invention achieves high-efficiency flame retardancy and environmental protection performance through phosphorus-oxygen-silicon synergistic flame retardancy. Phosphorus in phenyl dichlorophosphate generates phosphoric acid during combustion, promoting dehydration and char formation, resulting in a dense char layer that isolates oxygen and heat transfer. Nitrogen components release non-flammable gases, diluting the concentration of combustible gases and interrupting the combustion chain reaction. The high-bond-energy Si-O bonds and phosphorus-oxygen double bonds of the silicon system synergistically enhance the thermal stability of the material. Furthermore, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, as a component with high thermal stability... Phosphorus phenanthrene compounds promote the formation of a dense and continuous char layer during combustion, isolating oxygen and heat, and synergistically enhancing the flame-retardant effect with phosphorus-oxygen double bonds, thus extending service life. Furthermore, γ-glycidyl etheroxypropyltrimethoxysilane promotes the formation of a dense char layer on the surface during combustion, inhibiting heat transfer and oxygen diffusion, slowing the combustion process, and reducing smoke generation. In addition, the modified flame retardant prepared in this invention is halogen-free, helping to reduce environmental pollution and ecosystem damage, is harmless to human health, and achieves sustainable development. Detailed Implementation

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1: A method for preparing an antioxidant UV-curable coating, specifically including the following steps:

[0038] S1. Weigh the raw materials according to the following parts by weight: 90 parts epoxy acrylate resin, 40 parts methyl methacrylate, 25 parts diluent, 3 parts talc powder, 1 part modified antioxidant (prepared in this embodiment), 1 part modified flame retardant (prepared in this embodiment), 2 parts photoinitiator, 0.5 parts leveling agent, 1 part defoamer, and 1 part dispersant; mix the epoxy acrylate resin, methyl methacrylate, and polyethylene glycol dimethacrylate evenly, and stir at 800 rpm for 5-10 minutes to obtain the pretreated material;

[0039] S2. Add talc, modified antioxidant, modified flame retardant, photoinitiator 184, BYK-UV3500, BYK-1794 and BYK-2013 to the pretreatment material, stir at 1000 rpm for 30 min, filter, and obtain an antioxidant UV-cured coating by UV curing mechanism.

[0040] The modified antioxidant is prepared by the following method:

[0041] Step A1: Mix 0.01 mol of 2-(2-hydroxy-3,5-di-tert-pentylphenyl)benzotriazole and 13 mL of toluene, heat to 60 °C, then add 0.01 mol of 4-maleimide butyric acid and 2 mL of triethylamine and mix well. React at 80 °C for 4 h. After the reaction is complete, filter, wash, and vacuum dry to obtain the compound.

[0042] Step A2: Mix 0.01 mol itaconic acid, 0.01 mol 4,4-dihydroxydiphenyl sulfone, 2 g p-toluenesulfonic acid and 4 g p-hydroxyanisole evenly, react at 150 °C for 2 h under nitrogen protection, then add 2 mL dibutyltin dilaurate, vacuum distill at 150 °C for 2 h, cool to 100 °C, dry to obtain the preproduct;

[0043] Step A3: Disperse 0.01 mol of the compound and 0.16 g of benzoyl peroxide evenly in 50 mL of xylene, then add 0.01 mol of the preproduct and stir evenly. Under nitrogen protection, heat to 90 °C and react for 4.5 h. Distill under reduced pressure, cool, wash, filter, and vacuum dry to obtain the modified antioxidant.

[0044] The modified flame retardant is prepared by the following method:

[0045] Step B1: 0.01 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and 0.01 mol of γ-glycidyl etheroxypropyltrimethoxysilane were mixed evenly at 130 °C, and then 30 mL of N,N-dimethylacetamide was added. The temperature was raised to 130 °C and the mixture was stirred for 3 h. After the reaction was completed, the intermediate was obtained by vacuum distillation, washing, and vacuum drying.

[0046] Step B2: Add 0.02 mol of the intermediate to 150 mL of ethanol-water mixed solution and mix at 35 °C for 10 min. Then add 0.03 mol of phenyl dichlorophosphate, 50 mL of tetrahydrofuran and 30 g of triethylamine and mix well. Stir and react at 120 °C for 4 h. After the reaction is complete, vacuum filter, rotary evaporate and vacuum dry to obtain the modified flame retardant. The volume ratio of ethanol to water in the ethanol-water mixed solution is 4:1.

[0047] Example 2: A method for preparing an antioxidant UV-curable coating, specifically including the following steps:

[0048] S1. Weigh the raw materials according to the following parts by weight: 100 parts epoxy acrylate resin, 55 parts methyl methacrylate, 37 parts diluent, 4 parts talc powder, 3 parts modified antioxidant (prepared in this embodiment), 2 parts modified flame retardant (prepared in this embodiment), 5 parts photoinitiator, 0.7 parts leveling agent, 2 parts defoamer, and 2 parts dispersant; mix the epoxy acrylate resin, methyl methacrylate, and polyethylene glycol dimethacrylate evenly and stir at 900 rpm for 7 minutes to obtain the pretreated material;

[0049] S2. Add talc, modified antioxidant, modified flame retardant, photoinitiator 184, BYK-UV3500, BYK-1794 and BYK-2013 to the pretreatment material, stir at 1100 rpm for 40 min, filter, and obtain an antioxidant UV-cured coating by UV curing mechanism.

[0050] The modified antioxidant is prepared by the following method:

[0051] Step A1: Mix 0.02 mol of 2-(2-hydroxy-3,5-di-tert-pentylphenyl)benzotriazole and 14 mL of toluene, heat to 60 °C, then add 0.02 mol of 4-maleimide butyric acid and 4 mL of triethylamine and mix well. React at 80 °C for 4.5 h. After the reaction is complete, filter, wash, and vacuum dry to obtain the compound.

[0052] Step A2: Mix 0.02 mol itaconic acid, 0.02 mol 4,4-dihydroxydiphenyl sulfone, 4 g p-toluenesulfonic acid and 5 g p-hydroxyanisole evenly, react at 150 °C for 2 h under nitrogen protection, then add 4 mL dibutyltin dilaurate, vacuum distill at 150 °C for 2 h, cool to 100 °C, dry to obtain the preproduct;

[0053] Step A3: Disperse 0.02 mol of the compound and 0.16 g of benzoyl peroxide evenly in 55 mL of xylene, then add 0.02 mol of the preproduct and stir evenly. Under nitrogen protection, heat to 90 °C and react for 4.5 h. Distill under reduced pressure, cool, wash, filter, and vacuum dry to obtain the modified antioxidant.

[0054] The modified flame retardant is prepared by the following method:

[0055] Step B1: 0.02 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and 0.02 mol of γ-glycidyl etheroxypropyltrimethoxysilane were mixed evenly at 130 °C, and then 40 mL of N,N-dimethylacetamide was added. The temperature was raised to 135 °C and the mixture was stirred for 3 h. After the reaction was completed, the intermediate was obtained by vacuum distillation, washing, and vacuum drying.

[0056] Step B2: Add 0.03 mol of the intermediate to 150 mL of ethanol-water mixed solution and mix at 35 °C for 10 min. Then add 0.045 mol of phenyl dichlorophosphate, 50 mL of tetrahydrofuran and 30 g of triethylamine and mix well. Stir and react at 135 °C for 4 h. After the reaction is complete, vacuum filter, rotary evaporate and vacuum dry to obtain the modified flame retardant. The volume ratio of ethanol to water in the ethanol-water mixed solution is 4:1.

[0057] Example 3: A method for preparing an antioxidant UV-curable coating, specifically including the following steps:

[0058] S1. Weigh the raw materials according to the following parts by weight: 110 parts epoxy acrylate resin, 70 parts methyl methacrylate, 50 parts diluent, 5 parts talc powder, 5 parts modified antioxidant (prepared in this embodiment), 3 parts modified flame retardant (prepared in this embodiment), 8 parts photoinitiator, 1 part leveling agent, 3 parts defoamer, and 3 parts dispersant; mix the epoxy acrylate resin, methyl methacrylate, and polyethylene glycol dimethacrylate evenly, and stir at 1000 rpm for 10 min to obtain the pretreated material;

[0059] S2. Add talc, modified antioxidant, modified flame retardant, photoinitiator 184, BYK-UV3500, BYK-1794 and BYK-2013 to the pretreatment material, stir at 1200 rpm for 50 min, filter, and obtain an antioxidant UV-cured coating by UV curing mechanism.

[0060] The modified antioxidant is prepared by the following method:

[0061] Step A1: Mix 0.03 mol of 2-(2-hydroxy-3,5-di-tert-pentylphenyl)benzotriazole and 15 mL of toluene, heat to 60 °C, then add 0.03 mol of 4-maleimide butyric acid and 6 mL of triethylamine and mix well. React at 80 °C for 5 h. After the reaction is complete, filter, wash, and vacuum dry to obtain the compound.

[0062] Step A2: Mix 0.03 mol itaconic acid, 0.03 mol 4,4-dihydroxydiphenyl sulfone, 6 g p-toluenesulfonic acid and 6 g p-hydroxyanisole evenly, react at 150 °C for 2 h under nitrogen protection, then add 6 mL dibutyltin dilaurate, vacuum distill at 150 °C for 2 h, cool to 100 °C, dry to obtain the preproduct;

[0063] Step A3: Disperse 0.03 mol of the compound and 0.16 g of benzoyl peroxide evenly in 60 mL of xylene, then add 0.03 mol of the preproduct and stir evenly. Under nitrogen protection, heat to 90 °C and react for 4.5 h. Distill under reduced pressure, cool, wash, filter, and vacuum dry to obtain the modified antioxidant.

[0064] The modified flame retardant is prepared by the following method:

[0065] Step B1: 0.03 mol of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and 0.03 mol of γ-glycidyl etheroxypropyltrimethoxysilane were mixed evenly at 130 °C, and then 50 mL of N,N-dimethylacetamide was added. The temperature was raised to 140 °C and the mixture was stirred for 3 h. After the reaction was completed, the intermediate was obtained by vacuum distillation, washing, and vacuum drying.

[0066] Step B2: Add 0.04 mol of the intermediate to 150 mL of ethanol-water mixed solution and mix at 35 °C for 10 min. Then add 0.06 mol of phenyl dichlorophosphate, 50 mL of tetrahydrofuran and 30 g of triethylamine and mix well. Stir and react at 150 °C for 4 h. After the reaction is complete, vacuum filter, rotary evaporate and vacuum dry to obtain the modified flame retardant. The volume ratio of ethanol to water in the ethanol-water mixed solution is 4:1.

[0067] Comparative Example 1: This comparative example is an antioxidant UV-curable coating. The difference between this example and Example 3 is that an equal amount of UV-326 is used instead of the modified antioxidant prepared in Example 3. All other aspects are the same.

[0068] Comparative Example 2: This comparative example is an antioxidant UV-curable coating. The difference between this example and Example 3 is that an equal amount of magnesium hydroxide is used instead of the modified flame retardant prepared in Example 3. All other aspects are the same.

[0069] Performance Testing: The antioxidant UV-curable coatings prepared in Examples 1-3 and Comparative Examples 1-2 were applied to clean Q235 steel sheets. The flame retardancy rating of the coatings was tested according to standard GB 8624-2012; the impact toughness was tested according to standard GB / T 1732-2020; and the heat resistance temperature was tested according to standard GB / T 1735-2009. The test results are shown in Table 1 below.

[0070] Table 1

[0071]

[0072] As can be seen from the test data in Table 1, the antioxidant UV-curable coating prepared by the present invention has good heat oxidation resistance and toughening. Table 1 also shows that the antioxidant UV-curable coating prepared by the present invention has good flame retardant effect and extends service life.

[0073] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing an antioxidant UV-curable coating, characterized in that, Specifically, the following steps are included: S1. Weigh the raw materials according to the following parts by weight: 90-110 parts epoxy acrylate resin, 40-70 parts methyl methacrylate, 25-50 parts diluent, 3-5 parts talc, 1-5 parts modified antioxidant, 1-3 parts modified flame retardant, 2-8 parts photoinitiator, 0.5-1 part leveling agent, 1-3 parts defoamer, and 1-3 parts dispersant; mix the epoxy acrylate resin, methyl methacrylate, and diluent evenly, and stir at 800-1000 rpm for 5-10 minutes to obtain the pretreated material; S2. Add talc, modified antioxidant, modified flame retardant, photoinitiator, leveling agent, defoamer and dispersant to the pretreatment material, stir at 1000-1200 rpm for 30-50 min, filter, and use ultraviolet light curing mechanism to obtain antioxidant UV curing coating. The modified antioxidant is prepared by the following method: Step A1: Mix 2-(2-hydroxy-3,5-di-tert-pentylphenyl)benzotriazole and toluene, heat to 60°C, then add 4-maleimide butyric acid and triethylamine and mix well. React at 80°C for 4-5 hours. After the reaction is complete, filter, wash, and vacuum dry to obtain the compound. Step A2: Mix itaconic acid, 4,4-dihydroxydiphenyl sulfone, p-toluenesulfonic acid and p-hydroxyanisole evenly, react at 150°C for 2 hours under nitrogen protection, then add dibutyltin dilaurate, vacuum distill at 150°C for 2 hours, cool to 100°C, dry, and obtain the preproduct. Step A3: Disperse the compound and benzoyl peroxide evenly in xylene, then add the preproduct and stir evenly. Under nitrogen protection, heat to 90℃ and react for 4.5 h. Distill under reduced pressure, cool, wash, filter, and vacuum dry to obtain the modified antioxidant.

2. The method for preparing an antioxidant UV-curable coating according to claim 1, characterized in that, In step A1, the ratio of 2-(2-hydroxy-3,5-di-tert-pentylphenyl)benzotriazole, toluene, 4-maleimidebutyric acid, and triethylamine is 0.01-0.03 mol: 13-15 mL: 0.01-0.03 mol: 2-6 mL.

3. The method for preparing an antioxidant UV-curable coating according to claim 1, characterized in that, In step A2, the ratio of itaconic acid, 4,4-dihydroxydiphenyl sulfone, p-toluenesulfonic acid, p-hydroxyanisole, and dibutyltin dilaurate is 0.01-0.03 mol: 0.01-0.03 mol: 2-6 g: 4-6 g: 2-6 mL.

4. The method for preparing an antioxidant UV-curable coating according to claim 1, characterized in that, In step A3, the ratio of the compound, benzoyl peroxide, xylene, and preproduct is 0.01-0.03 mol: 0.16 g: 50-60 mL: 0.01-0.03 mol.

5. The method for preparing an antioxidant UV-curable coating according to claim 1, characterized in that, The modified flame retardant is prepared by the following method: Step B1: 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and γ-glycidyl etheroxypropyltrimethoxysilane were mixed evenly at 130°C, and then N,N-dimethylacetamide was added. The temperature was raised to 130-140°C and the mixture was stirred for 3 hours. After the reaction was completed, the intermediate was obtained by vacuum distillation, washing, and vacuum drying. Step B2: Add the intermediate to an ethanol-water mixture and mix at 35°C for 10 min. Then add phenyl dichlorophosphate, tetrahydrofuran and triethylamine and mix evenly. Stir and react at 120-150°C for 4 h. After the reaction is complete, vacuum filter, rotary evaporate and vacuum dry to obtain the modified flame retardant.

6. The method for preparing an antioxidant UV-curable coating according to claim 5, characterized in that, In step B1, the ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, γ-glycidyl etheroxypropyltrimethoxysilane, and N,N-dimethylacetamide is 0.01-0.03 mol: 0.01-0.03 mol: 30-50 mL.

7. The method for preparing an antioxidant UV-curable coating according to claim 5, characterized in that, In step B2, the ratio of the intermediate, ethanol-water mixture, phenyl dichlorophosphate, tetrahydrofuran, and triethylamine is 0.02-0.04 mol: 150 mL: 0.03-0.06 mol: 50 mL: 30 g, and the volume ratio of ethanol to water in the ethanol-water mixture is 4:

1.

8. The method for preparing an antioxidant UV-curable coating according to claim 1, characterized in that, The diluent is polyethylene glycol dimethacrylate, the photoinitiator is photoinitiator 184, the leveling agent is BYK-UV3500, the defoamer is BYK-1794, and the dispersant is BYK-2013.

9. An antioxidant UV-curable coating, characterized in that, Prepared by the preparation method according to any one of claims 1-8.

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