A modified epoxy resin spray paint and preparation method thereof

Abstract

The present invention relates to the field of coating technology, and specifically discloses a modified epoxy resin spray paint and a preparation method thereof. A modified epoxy resin spray paint, including 20-25 parts of modified epoxy resin emulsion, 10-20 parts of caprolactone acrylate, 15-25 parts of pigment slurry, 30-40 parts of solvent, 30-35 parts of dimethyl ether, 0.1-0.5 parts of nano-hydroxyapatite, 0.1-0.5 parts of water-based bentonite, 0.5-1 parts of dimethyl silicone oil; the preparation of the modified epoxy resin emulsion includes mixing epoxy resin and propylene glycol methyl ether, then adding acetone and initiator, and then dropping acrylic acid, methacrylic acid, hydroxypropyl acrylate, and butyl acrylate; finally, triethylamine and deionized water are added to make the solid content reach 50%-60%, to obtain a modified epoxy resin emulsion. The modified epoxy resin spray paint of the present application has good corrosion resistance, wear resistance and adhesion, and can meet the comprehensive performance requirements of modern electronic products for paint layer.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, in particular to a modified epoxy resin spray paint and a preparation method thereof. Background Art

[0002] With the rapid development of modern electronic technology, electronic products such as mobile phones have become an indispensable part of people's daily lives. These products must not only offer superior performance but also meet consumer expectations in terms of appearance, design, and durability. As a crucial component of electronic product appearance, the paint layer not only affects the product's aesthetics but also directly impacts its durability and protective properties.

[0003] While traditional epoxy resin spray paints can, to a certain extent, meet the basic paint requirements of electronic products, they still suffer from poor corrosion resistance. They are easily corroded by environmental factors during long-term use, causing the paint layer to peel or discolor, thereby affecting the overall aesthetics and service life of the product. To address these issues, a variety of modified epoxy resin spray paints have been developed in recent years to improve the corrosion resistance of spray paints. However, while these spray paints improve corrosion resistance when applied to electronic products such as mobile phones, they still have deficiencies in wear resistance and adhesion, and cannot fully meet the comprehensive performance requirements of modern electronic products for paint layers.

[0004] In view of the shortcomings of the existing technology, it is necessary to provide an electronic product spray paint with good comprehensive performance. Summary of the Invention

[0005] To provide a spray paint for electronic products with excellent overall performance, this application provides a modified epoxy resin spray paint and a method for preparing the same. Research has shown that specific modification methods and formulation optimization can significantly improve the overall performance of epoxy resin spray paint. The modified epoxy resin spray paint described in this application not only exhibits excellent corrosion resistance, but also possesses good wear resistance and adhesion, meeting the comprehensive performance requirements of modern electronic products for paint layers.

[0006] In the first aspect, the present application provides a modified epoxy resin spray paint using the following technical solution:

[0007] A modified epoxy resin spray paint comprises the following components in parts by mass: 20-25 parts of modified epoxy resin emulsion, 10-20 parts of caprolactone acrylate, 15-25 parts of pigment slurry, 30-40 parts of solvent, 30-35 parts of dimethyl ether, 0.1-0.5 parts of nano-hydroxyapatite, 0.1-0.5 parts of water-based bentonite, and 0.5-1 parts of dimethyl silicone oil;

[0008] The preparation of the modified epoxy resin emulsion comprises the following steps:

[0009] Step 1: Under a nitrogen atmosphere, take 10 parts of epoxy resin, add 11-12 parts of propylene glycol methyl ether, and heat to 60°C while stirring until the epoxy resin is completely dissolved, then add 1-2 parts of acetone and 0.02-0.03 parts of initiator, and keep warm for 30 minutes; Step 2: Heat the solution obtained in step 1 to 80°C, and then dropwise add a mixed solution consisting of 0.03-0.04 parts of initiator, 2-3 parts of acrylic acid, 1-2 parts of methacrylic acid, 0.5-1 parts of hydroxypropyl acrylate, and 5-8 parts of butyl acrylate. The addition is completed within 1.5 hours, and the mixture is kept warm for 2-3 hours;

[0010] Step 3: Triethylamine is added dropwise to the solution obtained in step 2 until the pH value is 8-9;

[0011] Step 4: Slowly add deionized water to the solution obtained in step 3 to make the solid content reach 50%-60%, and then centrifuge until it is evenly dispersed to obtain a modified epoxy resin emulsion.

[0012] In the above technical solution, this application not only improves the corrosion resistance of epoxy resin spray paint through specific modification methods and formula optimization, but also significantly enhances its wear resistance and adhesion. Specifically, by introducing modified epoxy resin and caprolactone acrylate, this application can further enhance the wear resistance and corrosion resistance of the paint layer, making the paint layer less prone to wear during long-term use and improving the protective effect of the paint layer on the substrate. At the same time, the addition of pigment slurry not only gives the spray paint good hiding power and color performance, but also enhances the adhesion of the paint layer by optimizing the compatibility of the pigment and the resin.

[0013] Furthermore, the present application modifies the epoxy resin by using acrylic acid, methacrylic acid, and hydroxypropyl acrylate, and introduces active groups into the epoxy resin, thereby increasing the crosslinking density of the paint layer, which can effectively improve the impact resistance and adhesion of the paint layer and enhance the adhesion of the paint layer on different substrates.

[0014] Furthermore, the present application can effectively improve the adhesion, corrosion resistance and impact resistance of the paint layer by introducing nanohydroxyapatite, water-based bentonite and dimethyl silicone oil. Nanohydroxyapatite has good biocompatibility and chemical stability, and can form a stable composite material with epoxy resin, thereby improving the mechanical properties and chemical corrosion resistance of the paint layer. Water-based bentonite has good dispersibility and adsorption properties, which can further enhance the adhesion and water resistance of the paint layer. Dimethyl silicone oil can form a protective film on the surface of the paint layer, effectively preventing the intrusion of moisture and pollutants, thereby improving the durability and protective performance of the paint layer.

[0015] Preferably, the epoxy resin includes at least epoxy resin E-51.

[0016] In the above technical solution, the present application further optimizes the performance of the paint layer by modifying epoxy resin E-51. Epoxy resin E-51 is a commonly used bisphenol A epoxy resin with excellent overall properties, such as excellent adhesion, chemical resistance, and electrical insulation. By modifying it, the overall performance of the paint layer can be further improved to meet the higher requirements of electronic products for paint layers.

[0017] Preferably, the epoxy resin is a mixture of epoxy resin E-51 and prefabricated epoxy resin, the mass ratio of the epoxy resin E-51 to the prefabricated epoxy resin is 1:(1-2), and the preparation method of the prefabricated epoxy resin comprises:

[0018] Step 1: Under a nitrogen atmosphere, mix 10 parts of epoxy resin E-51, 3-5 parts of styrenesulfonic acid, 4-6 parts of erucic acid, and 2-3 parts of vaccenic acid, stir and heat to 100-120°C, and maintain this temperature for 2 hours;

[0019] Step 2: After uniformly mixing 0.01-0.02 parts of N,N-dimethylethanolamine and 1.5-2 parts of propylene glycol methyl ether, add the mixture dropwise to the solution obtained in step 1 within 30 minutes, and continue the reaction until the acid value is less than 3 mgKOH / g to obtain a prefabricated epoxy resin.

[0020] In the above technical solution, the present application further improves the overall performance of the paint layer by modifying epoxy resin E-51 and prefabricated epoxy resin, particularly by modifying the prefabricated epoxy resin. The preparation method of the prefabricated epoxy resin introduces styrenesulfonic acid, erucic acid, and vaccenic acid, enabling the epoxy resin to better bond with active groups during the modification process, thereby increasing the crosslinking density and chemical resistance of the paint layer.

[0021] Preferably, the pigment slurry comprises the following components, calculated by weight: 60-70 parts of modified epoxy resin emulsion, 15-25 parts of pigment, 25-35 parts of solvent, and 1-2 parts of wetting and dispersing agent.

[0022] In the above technical solution, this application further optimizes the performance of the spray paint by selecting a specific pigment slurry formula. The modified epoxy resin emulsion contained in the pigment slurry can be fully mixed with the pigment, ensuring uniform distribution of the pigment in the paint layer, thereby providing better color uniformity and hiding power. Furthermore, the addition of a wetting and dispersing agent helps disperse the pigment particles in the resin, preventing pigment aggregation and ensuring a smooth and beautiful paint surface.

[0023] Preferably, the preparation method of the pigment slurry comprises: taking the modified epoxy resin emulsion, pigment, solvent and wetting dispersant according to the formula, then mixing them uniformly at 1000-1500 rpm, and then grinding them to a fineness of less than 15 μm to obtain the pigment slurry.

[0024] In the above technical solution, this application ensures the dispersibility and stability of the pigment slurry by optimizing the preparation method of the pigment slurry. Through high-speed mixing and grinding, the pigment particles are fully dispersed and evenly distributed in the modified epoxy resin emulsion. By controlling the fineness below 15μm, it can be ensured that the surface after painting has good smoothness and color uniformity, while avoiding possible color difference and granularity.

[0025] Preferably, the solvent is a combination of ethyl acetate, n-butanol and acetone, which comprises 10-15 parts of ethyl acetate, 15-20 parts of n-butanol and 0-5 parts of acetone based on the mass of the modified epoxy resin spray paint.

[0026] In the above technical solution, this application further optimizes the volatility and solubility of the spray paint by limiting the solvent to a combination of ethyl acetate, n-butanol, and acetone. This combination of ethyl acetate, n-butanol, and acetone provides excellent solvency, ensuring uniform dispersion of the modified epoxy resin emulsion during the spray painting process. It also maintains a moderate evaporation rate, avoiding paint defects caused by excessive solvent evaporation. Furthermore, this solvent combination has low toxicity, meets environmental protection requirements, and is beneficial to operator health and environmental protection.

[0027] Preferably, the initiator is benzoyl peroxide.

[0028] In the above technical solution, benzoyl peroxide is a commonly used initiator that can initiate free radical polymerization at relatively low temperatures, effectively promoting the formation of a modified epoxy resin emulsion. Its high initiation efficiency and mild reaction conditions facilitate control of the reaction process, ensuring consistent quality of the spray paint product.

[0029] In a second aspect, the present application provides a method for preparing a modified epoxy resin spray paint using the following technical solution:

[0030] A method for preparing a modified epoxy resin spray paint, comprising:

[0031] First, the modified epoxy resin emulsion and caprolactone acrylate are evenly mixed, and then the pigment slurry, solvent, dimethyl ether, nano-hydroxyapatite, water-based bentonite and dimethyl silicone oil are added in sequence and evenly mixed to obtain the modified epoxy resin spray paint.

[0032] In the above technical scheme, the present application obtains a uniform and stable modified epoxy resin spray paint through the above preparation method. Such modified epoxy resin spray paint not only has good corrosion resistance, but also has good adhesion and impact resistance. It can be widely used in various electronic products, such as mobile phones, tablet computers, laptop computers, etc. The shell coating can form a uniform and smooth paint layer on the substrate, and the drying speed is fast, which greatly improves the production efficiency.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 1. This application significantly improves the corrosion resistance and wear resistance of the paint layer by introducing modified epoxy resin and caprolactone acrylate, making it less prone to wear during long-term use and able to provide good protection for the substrate.

[0035] 2. This application further effectively improves the adhesion, corrosion resistance and impact resistance of the paint layer by introducing three additives: nano-hydroxyapatite, water-based bentonite and dimethyl silicone oil, thereby improving the durability and protective performance of the paint layer.

[0036] 3. The modified epoxy resin spray paint prepared in this application has good corrosion resistance, adhesion and impact resistance, is suitable for coating the shells of various electronic products, and has significant technical advantages and application value. DETAILED DESCRIPTION

[0037] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0038] The sources of raw materials in the following specific implementation methods are shown in Table 1.

[0039] Table 1:

[0040]

[0041]

[0042] Example 1

[0043] A modified epoxy resin spray paint comprises: 2 kg of modified epoxy resin emulsion, 2 kg of caprolactone acrylate, 1.5 kg of pigment slurry, 3 kg of solvent, 3 kg of dimethyl ether, 0.05 kg of nano-hydroxyapatite, 0.01 kg of water-based bentonite, and 0.05 kg of dimethyl silicone oil.

[0044] The solvent is a mixture of 1 kg of ethyl acetate, 1.5 kg of n-butanol, and 0.5 kg of acetone.

[0045] The preparation of the modified epoxy resin emulsion comprises the following steps:

[0046] Step 1: Under a nitrogen atmosphere, take 10 kg of epoxy resin, add 11 kg of propylene glycol methyl ether, and heat to 60°C while stirring until the epoxy resin is completely dissolved. Then add 1 kg of acetone and 0.02 kg of initiator, and keep the reaction warm for 30 minutes.

[0047] Step 2: Heat the solution obtained in step 1 to 80°C, and then dropwise add a mixed solution consisting of 0.04 kg initiator, 2 kg acrylic acid, 2 kg methacrylic acid, 0.5 kg hydroxypropyl acrylate, and 5 kg butyl acrylate. The addition should be completed within 1.5 hours, and the mixture should be kept warm for 2 hours.

[0048] Step 3: Triethylamine was added dropwise to the solution obtained in step 2 until the pH value reached 8.

[0049] Step 4: Slowly add deionized water to the solution obtained in step 3 to make the solid content reach 50%, and then centrifuge until it is evenly dispersed to obtain a modified epoxy resin emulsion.

[0050] Wherein, the initiator is benzoyl peroxide.

[0051] The epoxy resin is prepared by mixing epoxy resin E-51 and prefabricated epoxy resin in a mass ratio of 1:1.

[0052] The preparation method of the prefabricated epoxy resin includes:

[0053] s1: Under a nitrogen atmosphere, 10 kg of epoxy resin E-51, 3 kg of styrenesulfonic acid, 4 kg of erucic acid, and 3 kg of isoleic acid were mixed, stirred, heated to 100°C, and maintained at this temperature for 2 hours.

[0054] s2: After uniformly mixing 0.02 kg N, N-dimethylethanolamine and 2 kg propylene glycol methyl ether, add dropwise to the solution obtained in step 1 within 30 min. Continue the reaction until the acid value is <3 mg KOH / g to obtain a prefabricated epoxy resin.

[0055] The preparation method of the pigment slurry includes: taking 6 kg of modified epoxy resin emulsion, 1.5 kg of pigment, 1 kg of ethyl acetate, 2 kg of butyl acetate and 0.1 kg of wetting and dispersing agent, then mixing them evenly at 1000 rpm, and then grinding them to a fineness of less than 15 μm to obtain the pigment slurry.

[0056] Example 2

[0057] A modified epoxy resin spray paint, which differs from Example 1 in that it comprises: 2.5 kg of modified epoxy resin emulsion, 1 kg of caprolactone acrylate, 2.5 kg of pigment slurry, 4 kg of solvent, 3.5 kg of dimethyl ether, 0.01 kg of nano-hydroxyapatite, 0.05 kg of water-based bentonite, and 0.1 kg of dimethyl silicone oil.

[0058] The solvent is a mixture of 1.5 kg of ethyl acetate, 2 kg of n-butanol, and 0.5 kg of acetone.

[0059] The preparation of the modified epoxy resin emulsion comprises the following steps:

[0060] Step 1: Under a nitrogen atmosphere, take 10 kg of epoxy resin, add 12 kg of propylene glycol methyl ether, and heat to 60°C while stirring until the epoxy resin is completely dissolved. Then add 2 kg of acetone and 0.03 kg of initiator, and keep the reaction warm for 30 minutes.

[0061] Step 2: Heat the solution obtained in step 1 to 80°C, and then dropwise add a mixed solution consisting of 0.03 kg initiator, 3 kg acrylic acid, 1 kg methacrylic acid, 1 kg hydroxypropyl acrylate, and 8 kg butyl acrylate. The addition should be completed within 1.5 hours, and the mixture should be kept warm for 3 hours.

[0062] Step 3: Triethylamine was added dropwise to the solution obtained in step 2 until the pH value reached 9.

[0063] Step 4: Slowly add deionized water to the solution obtained in step 3 to make the solid content reach 60%, and then centrifuge until it is evenly dispersed to obtain a modified epoxy resin emulsion.

[0064] Wherein, the initiator is benzoyl peroxide.

[0065] The epoxy resin is prepared by mixing epoxy resin E-51 and prefabricated epoxy resin in a mass ratio of 1:2.

[0066] The preparation method of the prefabricated epoxy resin includes:

[0067] s1: Under a nitrogen atmosphere, 10 kg of epoxy resin E-51, 5 kg of styrenesulfonic acid, 6 kg of erucic acid, and 2 kg of isoleic acid were mixed, stirred, heated to 120°C, and maintained at this temperature for 2 hours.

[0068] s2: After uniformly mixing 0.01 kg N, N-dimethylethanolamine and 1.5 kg propylene glycol methyl ether, add dropwise to the solution obtained in step 1 within 30 min. Continue the reaction until the acid value is <3 mgKOH / g to obtain a prefabricated epoxy resin.

[0069] The preparation method of the pigment slurry includes: taking 7 kg of modified epoxy resin emulsion, 2.5 kg of pigment, 1.5 kg of ethyl acetate, 1.5 kg of butyl acetate and 0.2 kg of wetting and dispersing agent, then mixing them evenly at 1500 rpm, and then grinding them to a fineness of less than 15 μm to obtain the pigment slurry.

[0070] Example 3

[0071] A modified epoxy resin spray paint, which differs from Example 1 in that it includes: 2.2 kg of modified epoxy resin emulsion, 1.5 kg of caprolactone acrylate, 2 kg of pigment slurry, 3.5 kg of solvent, 3.2 kg of dimethyl ether, 0.02 kg of nano-hydroxyapatite, 0.04 kg of water-based bentonite, and 0.08 kg of dimethyl silicone oil.

[0072] The solvent is a mixture of 1.5 kg of ethyl acetate, 1.5 kg of n-butanol, and 0.5 kg of acetone.

[0073] The preparation of the modified epoxy resin emulsion comprises the following steps:

[0074] Step 1: Under a nitrogen atmosphere, take 10 kg of epoxy resin, add 11.5 kg of propylene glycol methyl ether, and heat to 60 ° C while stirring until the epoxy resin is completely dissolved. Then add 1.5 kg of acetone and 0.025 kg of initiator, and keep the reaction warm for 30 minutes.

[0075] Step 2: Heat the solution obtained in step 1 to 80°C, and then dropwise add a mixed solution consisting of 0.035 kg initiator, 2.5 kg acrylic acid, 1.5 kg methacrylic acid, 0.8 kg hydroxypropyl acrylate, and 7 kg butyl acrylate. The addition should be completed within 1.5 hours, and the mixture should be kept warm for 2.5 hours.

[0076] Step 3: Triethylamine was added dropwise to the solution obtained in step 2 until the pH value reached 8.5.

[0077] Step 4: Slowly add deionized water to the solution obtained in step 3 to make the solid content reach 55%, and then centrifuge until it is evenly dispersed to obtain a modified epoxy resin emulsion.

[0078] Wherein, the initiator is benzoyl peroxide.

[0079] The epoxy resin is prepared by mixing epoxy resin E-51 and prefabricated epoxy resin at a mass ratio of 1:1.5.

[0080] The preparation method of the prefabricated epoxy resin includes:

[0081] s1: Under a nitrogen atmosphere, 10 kg of epoxy resin E-51, 4 kg of styrenesulfonic acid, 5 kg of erucic acid, and 2.5 kg of vaccenic acid were mixed, stirred, heated to 110°C, and maintained at this temperature for 2 hours.

[0082] s2: After uniformly mixing 0.015 kg N, N-dimethylethanolamine and 1.8 kg propylene glycol methyl ether, add dropwise to the solution obtained in step 1 within 30 min. Continue the reaction until the acid value is <3 mgKOH / g to obtain a prefabricated epoxy resin.

[0083] The preparation method of the pigment slurry includes: taking 6.5 kg of modified epoxy resin emulsion, 2 kg of pigment, 1.2 kg of ethyl acetate, 1.8 kg of butyl acetate and 0.15 kg of wetting and dispersing agent, then mixing them evenly at 1200 rpm, and then grinding them to a fineness of less than 15 μm to obtain the pigment slurry.

[0084] Example 4

[0085] A modified epoxy resin spray paint is different from Example 1 in that the epoxy resin added in step 1 of preparing the modified epoxy resin emulsion is epoxy resin E-51.

[0086] Comparative Example 1

[0087] A modified epoxy resin spray paint, which is different from Example 4 in that an equal amount of caprolactone acrylate is replaced by a modified epoxy resin emulsion.

[0088] Comparative Example 2

[0089] A modified epoxy resin spray paint is different from Example 4 in that an equal amount of hydroxypropyl acrylate is replaced by ethyl acrylate in step 2 of preparing the modified epoxy resin emulsion.

[0090] Comparative Example 3

[0091] A modified epoxy resin spray paint, which is different from Example 4 in that an equal amount of nano-hydroxyapatite is replaced by nano-silicon dioxide.

[0092] Comparative Example 4

[0093] A modified epoxy resin spray paint, which differs from Example 4 in that an equal amount of water-based bentonite is replaced with attapulgite clay.

[0094] Comparative Example 5

[0095] A modified epoxy resin spray paint, which differs from Example 4 in that an equal amount of dimethyl silicone oil is replaced by acrylated polysiloxane.

[0096] Performance testing: Add a certain amount of water-based curing agent to the modified epoxy resin spray paint and stir evenly. The adhesion is measured according to GB / T9286-2021, the impact resistance is measured according to GB / T1732-2020, the water resistance is measured according to GB / T1733-1993, the salt spray resistance is measured according to GB / T1771-2007, the hardness is measured according to GB / T6739-2022, and the gloss is measured according to GB / T8941-2013.

[0097] The above test results are shown in Table 2.

[0098] Table 2:

[0099]

[0100] Specifically, in combination with Examples 1-4 and Comparative Examples 1-5, it can be seen that the modified epoxy resin spray paints of the present application examples have good adhesion, impact resistance, wear resistance, and corrosion resistance, and the paint films of Examples 1-4 of the present application have good gloss. Therefore, it can be seen that the modified epoxy resin spray paints of Examples 1-4 of the present application have good comprehensive properties.

[0101] Specifically analyzing Example 1 and Example 4, Example 4 does not add prefabricated epoxy resin, and Example 1 has good comprehensive performance. It can be seen that the present application can further improve the comprehensive performance of the paint layer by modifying the prefabricated epoxy resin and introducing styrenesulfonic acid, erucic acid and isooleic acid.

[0102] Specifically combined with Example 4 and Comparative Examples 1-5 for analysis, caprolactone acrylate was not added in Comparative Example 1, ethyl acrylate was replaced with an equal amount of hydroxypropyl acrylate in step 2 of preparing the modified epoxy resin emulsion in Comparative Example 2, and nano-hydroxyapatite, aqueous bentonite and dimethyl silicone oil were replaced with three additives in Comparative Examples 3-5, respectively. Further analysis showed that caprolactone acrylate played a key role in improving the flexibility and corrosion resistance of the paint film of the present application, and hydroxypropyl acrylate was more effective in improving the adhesion performance and water penetration resistance of the paint film. The selection of three additives, nano-hydroxyapatite, aqueous bentonite and dimethyl silicone oil, can further optimize the physical and chemical properties of the paint film and improve the comprehensive performance of the paint film.

[0103] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A modified epoxy resin spray paint, characterized in that, The invention comprises the following components in parts by mass: 20-25 parts of modified epoxy resin emulsion, 10-20 parts of caprolactone acrylate, 15-25 parts of pigment slurry, 30-40 parts of solvent, 30-35 parts of dimethyl ether, 0.1-0.5 parts of nano-hydroxyapatite, 0.1-0.5 parts of water-based bentonite, and 0.5-1 parts of dimethyl silicone oil; The preparation of the modified epoxy resin emulsion comprises the following steps: Step 1: Under a nitrogen atmosphere, take 10 parts of epoxy resin, add 11-12 parts of propylene glycol methyl ether, and heat to 60°C while stirring until the epoxy resin is completely dissolved. Then, add 1-2 parts of acetone and 0.02-0.03 parts of initiator, and keep the temperature for 30 minutes; Step 2: Heat the solution obtained in step 1 to 80°C, and then dropwise add a mixed solution consisting of 0.03-0.04 parts of initiator, 2-3 parts of acrylic acid, 1-2 parts of methacrylic acid, 0.5-1 parts of hydroxypropyl acrylate, and 5-8 parts of butyl acrylate. The addition should be completed within 1.5 hours, and the mixture should be kept warm for 2-3 hours. Step 3: Triethylamine is added dropwise to the solution obtained in step 2 until the pH value is 8-9; Step 4: Slowly add deionized water to the solution obtained in step 3 to make the solid content reach 50%-60%, and then centrifuge until it is evenly dispersed to obtain a modified epoxy resin emulsion; The epoxy resin includes at least epoxy resin E-51; The epoxy resin is a mixture of epoxy resin E-51 and prefabricated epoxy resin, wherein the mass ratio of the epoxy resin E-51 to the prefabricated epoxy resin is 1:(1-2). The preparation method of the prefabricated epoxy resin comprises: Step 1: Under a nitrogen atmosphere, mix 10 parts of epoxy resin E-51, 3-5 parts of styrenesulfonic acid, 4-6 parts of erucic acid, and 2-3 parts of vaccenic acid, stir and heat to 100-120°C, and maintain this temperature for 2 hours; Step 2: After uniformly mixing 0.01-0.02 parts of N,N-dimethylethanolamine and 1.5-2 parts of propylene glycol methyl ether, add the mixture dropwise to the solution obtained in step 1 within 30 minutes, and continue the reaction until the acid value is less than 3 mgKOH / g to obtain a prefabricated epoxy resin.

2. The modified epoxy resin spray paint according to claim 1, characterized in that: Calculated by weight of the pigment slurry, the pigment slurry includes the following components: 60-70 parts of modified epoxy resin emulsion, 15-25 parts of pigment, 25-35 parts of solvent, and 1-2 parts of wetting and dispersing agent.

3. The modified epoxy resin spray paint according to claim 2, characterized in that: The preparation method of the pigment slurry comprises: taking modified epoxy resin emulsion, pigment, solvent and wetting dispersant according to the formula, then mixing them uniformly at 1000-1500 rpm, and then grinding them to a fineness of less than 15 μm to obtain the pigment slurry.

4. The modified epoxy resin spray paint according to claim 1, characterized in that: The solvent is a combination of ethyl acetate, n-butanol and acetone, and based on the mass of the modified epoxy resin spray paint, comprises 10-15 parts of ethyl acetate, 15-20 parts of n-butanol and 0-5 parts of acetone.

5. The modified epoxy resin spray paint according to claim 1, characterized in that: The initiator is benzoyl peroxide.

6. A method for preparing the modified epoxy resin spray paint according to any one of claims 1 to 5, characterized in that: include: First, the modified epoxy resin emulsion and caprolactone acrylate are evenly mixed, and then the pigment slurry, solvent, dimethyl ether, nano-hydroxyapatite, water-based bentonite and dimethyl silicone oil are added in sequence and evenly mixed to obtain the modified epoxy resin spray paint.

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