EB curing coating composition as well as preparation method and application thereof

Abstract

The invention discloses an EB curing coating composition as well as a preparation method and application thereof, and the EB curing coating composition comprises the following components in parts by weight: 30-90 parts of a vinyl-terminated polyurethane prepolymer, 10-40 parts of a reactive diluent and 0.5-15 parts of an auxiliary agent, wherein the vinyl-terminated polyurethane prepolymer comprises a prepolymer A, a prepolymer B and a prepolymer C which have specific structures. The EB curing coating composition disclosed by the invention can ensure that a cured coating has excellent scratch resistance, stripping strength and salt spray resistance, and expands the development space of an EB curing process.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer composite materials, and in particular to an EB curing coating composition, a preparation method and application thereof. Background Art

[0002] Electron beam curing (EB) is a groundbreaking process in modern materials engineering, built on the precise control of a material's microstructure. This technology rapidly cures liquid precursors by irradiating them with a controlled high-energy electron beam (typically in the energy range of 80-300 keV). EB curing, due to its advantages such as the absence of photoinitiators, adjustable electron beam penetration depth, and high curing rates, has demonstrated unique application value in advanced manufacturing fields such as precision coatings, biomedical materials, and 3D printing. In particular, it is driving significant innovations in materials processing, such as in-situ curing of aerospace composites and low-temperature packaging of flexible electronics. However, current research generally indicates that the salt spray corrosion resistance of EB-cured coatings is significantly inferior to that of traditional thermally cured or solvent-based coatings. Salt spray corrosion is the electrochemical degradation of materials in salty, humid environments, posing a significant challenge to the coating's adhesion, barrier properties, and substrate protection. Inadequate salt spray resistance can lead to blistering and flaking of the coating or substrate corrosion, severely impacting long-term reliability. However, the current EB-cured coatings are often severely limited in their application in transportation, aerospace, new energy and power facilities, electronic appliances and precision instruments due to their poor salt spray resistance.

[0003] Therefore, the key to solving these problems is to develop a novel composition that can adapt to the EB curing process and has high salt spray resistance. This composition must not only have good curing efficiency but also significantly improve the scratch resistance, peel strength, and even salt spray resistance of the cured coating to meet the actual needs of industrial production. Summary of the Invention

[0004] In view of the defects in the prior art, the present invention provides an EB-curing coating composition, a preparation method and an application thereof.

[0005] The present invention provides an EB curing coating composition, comprising the following components, in parts by weight: 30-90 parts of a vinyl terminated polyurethane prepolymer, such as 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, and 90 parts; 10-40 parts of a reactive diluent, such as 10, 15, 20, 25, 30, 35, and 40 parts; and 0.5-15 parts of an auxiliary agent, such as 0.5, 1, 2, 4, 6, 8, 10, 12, 14, and 15 parts; wherein the vinyl terminated polyurethane prepolymer comprises prepolymer A, prepolymer B, and prepolymer C; The structure of the prepolymer A is as follows: ; The structure of the prepolymer B is as follows: ; in, ; The structure of the prepolymer C is as follows: .

[0006] Furthermore, the mass ratio of the prepolymer A, prepolymer B and prepolymer C is (4-10): (2-4): (1-5); the prepolymers have different degrees of cross-linking during the curing process and cross-link with each other. The membrane material obtained by combining the three prepolymers in a specific mass ratio is denser than the two components and can more effectively block the corrosion of moisture and salt.

[0007] Furthermore, the mass ratio of the prepolymer A, prepolymer B and prepolymer C is (4-10): (2-4): (1-2).

[0008] Furthermore, the reactive diluent is an acrylate monomer containing a double bond, and the acrylate monomer is selected from any one or more of a monofunctional acrylate monomer, a difunctional acrylate monomer, or a multifunctional acrylate monomer.

[0009] The monofunctional acrylate monomers include but are not limited to any one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate, isobornyl acrylate, and isobornyl methacrylate; the bifunctional acrylate monomers include but are not limited to neopentyl glycol diacrylate, hexanediol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, tripropylene glycol dimethacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, triethylene glycol dimethacrylate, 1,4-butanediol dimethacrylate, neopentyl glycol diacrylate, hexanediol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, tripropylene glycol dimethacrylate, diethylene glycol diacrylate, triethylene glycol dimethacrylate, 1,4-butanediol dimethacrylate, neopentyl glycol diacrylate, hexanediol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, tripropylene glycol dimethacrylate, diethylene glycol diacrylate, triethylene glycol dimethacrylate, 1,4-butanediol dimethacrylate, neopentyl glycol diacrylate, hexanediol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, tripropylene glycol dimethacrylate, 1,4-butanediol ... Any one or more of pentylene glycol dimethacrylate, neopentyl glycol dipropoxy diacrylate, neopentyl glycol dipropoxy dimethacrylate, and 2-methyl-1,3-propanediol diacrylate; the multifunctional acrylate monomer includes but is not limited to any one or more of trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, pentaerythritol trimethacrylate, dipentaerythritol hexaacrylate, propoxylated trimethylolpropane trimethacrylate, propoxylated glycerol triacrylate, propoxylated glycerol trimethacrylate, triallyl triisocyanate, and trimethylallyl triisocyanate.

[0010] Furthermore, the auxiliary agent is any one or more of a dispersant, a leveling agent, a defoaming agent, an antioxidant, an adhesion promoter, a heat stabilizer, a filler or a pigment.

[0011] The dispersant includes but is not limited to any one or more of N,N'-ethylenebisstearamide, EFKA-4560, BYK-110, BYK-111, BYK-112, and BYK-116; the leveling agent includes but is not limited to any one or more of BYK-350, BYK331, BYK333, and AFCONA3034; the defoaming agent includes but is not limited to any one or more of BYK-1790, BYK052, BYK055, and AFCONA2022; the antioxidant includes but is not limited to 1010; the adhesion promoter includes but is not limited to any one or more of silane coupling agent, titanate silane coupling agent, Dow Corning 6030, and FM135; the thermal stabilizer includes but is not limited to any one or more of rare earth / calcium / zinc composite thermal stabilizer, dibutyltin dilaurate, zinc stearate, aluminum stearate, and aluminum distearate; the filler includes but is not limited to ultraviolet absorbing inorganic particles; and the pigment includes but is not limited to titanium dioxide.

[0012] Furthermore, the preparation method of the prepolymer A comprises the following steps: S1: preparing N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1; S2: In a four-necked flask equipped with a water separator, an addition funnel, and a mechanical stirrer, add 1 mol of four-arm polyethylene glycol, 4.1-4.4 mol of N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1, and 0.8-1.5 mol of p-toluenesulfonic acid. The mixture is then heated to 130-150°C for 3.5-5 hours to obtain compound 2 as a light yellow oil. S3: Using dry polytetrahydrofuran as solvent, add 1 mol of compound 2 to a three-necked round-bottom flask. After installing a stirring paddle and a thermometer, introduce N2 for gas protection and stir at 45-60°C for 25-32 min. Then, raise the temperature to 70-84°C, add 4.1-4.4 mol of isophorone diisocyanate (IPDI) to the flask, continue to raise the temperature to 85-90°C, add 0.05-0.1 mol of catalyst dibutyltin dilaurate (DBTDL), and react under mechanical stirring for 1.5-2 h to obtain polyurethane intermediate 3; S4: After adjusting the temperature to 50-60°C, react with 4.1-4.4 mol of hydroxyethyl methacrylate (HEMA) for 3.5-5 h to obtain prepolymer A. The reaction formula is as follows: ; The molecular weight of the four-arm polyethylene glycol is 2000-20000, such as 2000, 5000, 10000 or 20000.

[0013] The preparation method of N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1 comprises the following steps: In a four-necked flask equipped with helium protection, a condenser and mechanical stirring, 200-250 mL of methanol was used as the solvent, 1.0-1.5 mol of methyl acrylate and 1.01-1.51 mol of diethanolamine were added, and the mixture was stirred at room temperature under nitrogen protection for 28-35 min. The temperature was then raised to 38-45°C for reaction for 4-4.5 h. The methanol was distilled off to obtain colorless and transparent N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1. The reaction formula is as follows: .

[0014] Furthermore, the preparation method of the prepolymer B comprises the following steps: S1: In a four-necked flask equipped with a water separator, an addition funnel, and a mechanical stirrer, 0.9-1.3 mol of trimethylolpropane, 3.1-3.2 mol of methyl N,N-dihydroxyethyl-3-aminopropionate monomer 1, and 0.1-0.6 mol of p-toluenesulfonic acid were added. The mixture was heated to 95-110°C and reacted for 5.5-7 hours to obtain compound 2' as a light yellow oil. S2: Using dry polytetrahydrofuran as solvent, add 0.9-1.3 mol of compound 2' to a three-necked round-bottom flask. After installing a stirring paddle and a thermometer, introduce N2 for gas protection and stir at 45-60°C for 28-35 min. Then, raise the temperature to 78-85°C, add 3.1-3.4 mol of isophorone diisocyanate (IPDI) to the flask, continue to raise the temperature to 80-88°C, add 0.05-0.1 mol of dibutyltin dilaurate (DBTDL) as a catalyst, and react under mechanical stirring for 1-2 h to obtain polyurethane intermediate 3'; S3: After adjusting the temperature to 48-55°C, react with 3.1-3.4 mol of hydroxyethyl methacrylate (HEMA) for 3.5-4 h to obtain vinyl-terminated polyurethane prepolymer B. The reaction formula is as follows: .

[0015] Furthermore, the preparation method of the prepolymer C comprises the following steps: In a four-necked flask equipped with a water separator, a feeding funnel and a mechanical stirrer, 1 mol of four-arm polyethylene glycol isocyanate and 4.1-4.4 mol of hydroxyethyl methacrylate (HEMA) were added, and then reacted at 58-65°C for 3.5-5 h to obtain prepolymer C. The reaction formula is as follows: ; The molecular weight of one arm of the four-arm polyethylene glycol isocyanate is 2000-20000, such as 2000, 5000, 10000, or 20000.

[0016] The present invention also provides a method for preparing the composition, comprising the following steps: The vinyl-terminated polyurethane prepolymer, reactive diluent and auxiliary agent are weighed in parts by weight, mixed evenly, and dispersed in a high-speed disperser at 2800-3500 rpm for 70-85 minutes to obtain the coating composition.

[0017] The present invention also provides the application of the composition in EB coatings, especially in multi-layer plastic films, or as a coating for various devices that need to be used in salt spray environments, which greatly broadens the development space of EB curing technology.

[0018] Furthermore, the preparation method of the EB coating comprises the following steps: Pre-treating the surface of the substrate, then coating the composition on the surface of the substrate, and curing the substrate by EB radiation in a protective gas atmosphere to obtain a composite material with an EB coating; The coating method includes spray coating, roller coating, micro-concave roller coating, slit coating, curtain coating and the like.

[0019] Furthermore, the pretreatment includes but is not limited to removing impurities, cleaning or removing moisture, etc., and may also be subjected to surface roughening treatment or coating of a transition layer, etc.

[0020] In summary, compared with the prior art, the present invention achieves the following technical effects: (1) The coating composition provided by the present invention is suitable for EB curing, which provides important industrial value for the development of EB curing technology; (2) The coating provided by the coating composition of the present invention has excellent salt spray resistance after EB curing, which greatly expands its application as a coating in various fields; (3) The coating provided by the coating composition of the present invention after EB curing has excellent scratch resistance and peel strength, and can form a coating with good performance. DETAILED DESCRIPTION

[0021] In order to help those skilled in the art better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts should fall within the scope of protection of the present invention.

[0022] Example The present invention is further described below with reference to specific examples and comparative examples. The following specific examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples, and are particularly not limited to the types of the various component raw materials used in the following specific examples.

[0023] 1. The sources of raw materials for the embodiments and comparative examples are as follows: Unless otherwise specified, the raw materials used in the examples and comparative examples of the present invention are commercially available.

[0024] The preparation method of prepolymer A#1 used in the embodiment of the present invention is as follows: S1: In a four-necked flask equipped with a water separator, an addition funnel, and a mechanical stirrer, 1 mol of four-arm polyethylene glycol (molecular weight per arm: 2000), 4.1 mol of N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1, and 1 mol of p-toluenesulfonic acid were added. The mixture was heated to 140°C for 4 hours to obtain compound 2 as a light yellow oil. S2: Using dry polytetrahydrofuran as solvent, 1 mol of compound 2 was added to a three-necked round-bottom flask. After installing a stirring paddle and a thermometer, N2 was introduced for gas protection and stirred at 55°C for 30 min. Subsequently, the temperature was raised to 80°C, and 4.2 mol of isophorone diisocyanate (IPDI) was added to the flask. The temperature was continuously raised to 85°C, and 0.08 mol of dibutyltin dilaurate (DBTDL) as a catalyst was added. The reaction was allowed to react under mechanical stirring for 1.5 h to obtain polyurethane intermediate 3. S3: After adjusting the temperature to 50°C, react with 4.4 mol of hydroxyethyl methacrylate (HEMA) for 4 h to obtain vinyl-terminated polyurethane prepolymer A#1; Wherein, the preparation method of N, N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1 is as follows: In a four-necked flask equipped with helium protection, a condenser, and mechanical stirring, 1 mol of methyl acrylate and 1.01 mol of diethanolamine were added to 200 mL of methanol as solvent. The mixture was stirred at room temperature under nitrogen protection for 30 min, and then the temperature was raised to 40°C for reaction for 4 h. The methanol was distilled off to obtain colorless and transparent N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1.

[0025] The preparation method of prepolymer A#2 used in the comparative example of the present invention is as follows: S1: In a four-necked flask equipped with a water separator, an addition funnel, and a mechanical stirrer, 1 mol of PEG (single-arm molecular weight 2000), 2.1 mol of methyl N,N-dihydroxyethyl-3-aminopropionate monomer 1, and 0.2 mol of p-toluenesulfonic acid were added. The mixture was heated to 140°C for 4 hours to obtain compound 5 as a light yellow oil. S2: Using dry polytetrahydrofuran as solvent, 1 mol of compound 5 was added to a three-necked round-bottom flask. After installing a stirring paddle and a thermometer, N2 was introduced for gas protection and stirred at 55°C for 30 min. Subsequently, the temperature was raised to 80°C, and 2.2 mol of isophorone diisocyanate (IPDI) was added to the flask. The temperature was continuously raised to 85°C, and 0.08 mol of dibutyltin dilaurate (DBTDL) as a catalyst was added. The reaction was allowed to react under mechanical stirring for 1.5 h to obtain polyurethane intermediate 6. S3: After adjusting the temperature to 50°C, react with 2.4 mol of hydroxyethyl methacrylate (HEMA) for 4 h to obtain vinyl-terminated polyurethane prepolymer A#2. The reaction formula is as follows: .

[0026] The preparation method of the prepolymer B used in the examples and comparative examples of the present invention is as follows: S1: 1.0 mol of trimethylolpropane, 3.1 mol of methyl N,N-dihydroxyethyl-3-aminopropionate monomer 1, and 0.3 mol of p-toluenesulfonic acid were added to a four-necked flask equipped with a water separator, an addition funnel, and a mechanical stirrer. The mixture was heated to 105°C for 6 hours to obtain compound 2' as a light yellow oil. S2: Using dry polytetrahydrofuran as solvent, 1.0 mol of compound 2' was added to a three-necked round-bottom flask. After installing a stirring paddle and a thermometer, N2 was introduced for gas protection and stirred at 55°C for 30 min. Subsequently, the temperature was raised to 80°C, and 3.2 mol of isophorone diisocyanate (IPDI) was added to the flask. The temperature was continuously raised to 85°C, and 0.1 mol of dibutyltin dilaurate (DBTDL) as a catalyst was added. The reaction was allowed to react under mechanical stirring for 1.5 h to obtain the polyurethane intermediate 3'. S3: After adjusting the temperature to 50°C, react with 3.2 mol of hydroxyethyl methacrylate (HEMA) for 4 h to obtain vinyl-terminated polyurethane prepolymer B.

[0027] The preparation method of the prepolymer C used in the examples and comparative examples of the present invention is as follows: In a four-necked flask equipped with a water separator, an addition funnel and a mechanical stirrer, 1 mol of four-arm polyethylene glycol isocyanate (single-arm molecular weight of 5000) and 4.1 mol of hydroxyethyl methacrylate (HEMA) were added and reacted at 60 °C for 4 h to obtain a vinyl-terminated polyurethane prepolymer C.

[0028] The preparation methods of the coating compositions of the embodiments and comparative examples of the present invention are as follows: A vinyl-terminated polyurethane prepolymer, a reactive diluent, and an auxiliary agent are added in parts by weight, mixed, and dispersed in a high-speed disperser at 3000 rpm for 80 minutes to obtain a coating composition; the reactive diluent used is obtained by mixing hydroxypropyl acrylate, hexanediol diacrylate, and trimethylolpropane triacrylate in a mass ratio of 1:1:1; the auxiliary agent is obtained by mixing N,N'-ethylenebisstearamide, BYK331, and BYK-1790 in a mass ratio of 1:2:2.

[0029] 2. Various performance test methods The surface of the polypropylene substrate is treated and placed at room temperature for more than 48 hours to ensure that the surface is dry and free of impurities. The polypropylene substrate is placed on an EB radiation curing device, coated with an EB radiation curing coating composition, and the EB radiation curing process is completed to obtain a composite film material.

[0030] (1) EB radiation curing conditions: Curing was carried out under the following conditions: radiation voltage 200 KeV, curing speed 400 m / min, electron beam dose 40 KGy, nitrogen concentration 200 mg / L, and curing temperature 25°C.

[0031] (2) Scratch resistance: The test standard is ISO1518-2:1992. The diameter of the steel ball used in the test is 1 mm. An electric scratch tester is used to perform a unidirectional scratch test on the coating surface at a speed of 20 mm / s. The scratch length is 50 mm. The experiment is repeated 3-5 times and the average value is taken. The load during the scratching of the steel needle is continuously increased. The load when the coating begins to be scratched by the steel needle is recorded as an indicator for evaluating the scratch resistance of the coating. The greater the load, the better the scratch resistance.

[0032] (3) Interlayer peeling strength test: The peeling strength between the EB layer and the substrate of each composite film material was tested according to Method A in 4.1 of GB / T8808-1988 “Test method for peeling of soft composite plastic materials”.

[0033] (4) Salt spray resistance time test method: The salt spray resistance test is based on "GB / T 1771-2007 Paints and varnishes - Determination of neutral salt spray resistance". First, the sample to be tested is placed in an environment with a temperature of 25°C and a relative humidity of 50% for 48 hours. Then the sample is placed in a salt spray chamber at 25°. The salt spray solution is 50 g / L sodium chloride solution, and the pH value is controlled between 6.5 and 7.2. The experimental temperature is maintained at (35±2)°C. The salt spray solution is evenly sprayed onto the surface of the sample through the nozzle to form a high humidity, high salt corrosive environment. The sample is taken out every 24 hours to observe whether there are defects such as blistering, cracking, and shedding on the paint film surface.

[0034] Table 1 Technical solutions and effects of the embodiments (units are parts by weight)

[0035] Table 2 Comparative Example Technical Scheme and Effects (Units are parts by weight)

[0036] In Examples 1-11, prepolymer A, prepolymer B, prepolymer C, reactive diluents and additives mixed in a specific mass ratio are simultaneously introduced. All coating compositions prepared in Examples 1-11 can be cured by EB, and the cured coatings have excellent scratch resistance and peel strength as well as excellent salt spray resistance, wherein the scratch resistance reaches 2000 or above, the peel strength is ≥20N, and the salt spray resistance time can reach more than 570 hours.

[0037] Comparative Examples 1-5 are compared with Example 1. The prepolymer A#2 used in Comparative Example 1 is not the prepolymer A with a specific structure of the present application, which makes the olefin content in the material low and the degree of curing and cross-linking insufficient, resulting in low hardness and scratch resistance of the material; Comparative Example 2 only uses prepolymer C, Comparative Example 3 only uses prepolymer B, Comparative Example 4 only uses prepolymer A, and Comparative Example 5 only adds prepolymer A and prepolymer C. None of them can ensure the scratch resistance, peel strength and even salt spray resistance of the coating while performing EB curing.

[0038] Based on the test data of coating hardness, scratch resistance, peel strength and salt spray resistance in Tables 1 and 2, the EB-cured coating compositions prepared by Examples 1-11 have obvious advantages over the comparative examples and can effectively meet the high standards of customers and the market.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An EB curing coating composition, characterized in that Calculated by weight, it includes the following components: 30-90 parts vinyl terminated polyurethane prepolymer 10-40 parts of active diluent 0.5-15 parts of additives; Wherein, the vinyl terminated polyurethane prepolymer comprises prepolymer A, prepolymer B and prepolymer C; The structure of the prepolymer A is as follows: ； The structure of the prepolymer B is as follows: ； in, ; The structure of the prepolymer C is as follows: 。 2. The composition according to claim 1, characterized in that The mass ratio of the prepolymer A, prepolymer B and prepolymer C is (4-10): (2-4): (1-5).

3. The composition according to claim 2, characterized in that The mass ratio of the prepolymer A, prepolymer B and prepolymer C is (4-10): (2-4): (1-2).

4. The composition according to claim 1, characterized in that The reactive diluent is an acrylate monomer containing a double bond, and the acrylate monomer is selected from any one or more of a monofunctional acrylate monomer, a difunctional acrylate monomer, or a multifunctional acrylate monomer.

5. The composition according to claim 1, characterized in that The auxiliary agent is any one or more of a dispersant, a leveling agent, a defoaming agent, an antioxidant, an adhesion promoter, a heat stabilizer, a filler or a pigment.

6. The composition according to claim 1, characterized in that The preparation method of the prepolymer B comprises the following steps: S1: Add 0.9-1.3 mol of trimethylolpropane, 3.1-3.2 mol of N,N-dihydroxyethyl-3-aminopropionic acid methyl ester monomer 1, and 0.1-0.6 mol of p-toluenesulfonic acid to a four-necked flask, heat the mixture to 95-110° C. and react for 5.5-7 hours to obtain compound 2′ as a light yellow oil; S2: Using dry polytetrahydrofuran as solvent, add 0.9-1.3 mol of compound 2' to a three-necked round-bottom flask. After installing a stirring paddle and a thermometer, introduce N2 for gas protection and stir at 45-60°C for 28-35 min. Then, raise the temperature to 78-85°C, add 3.1-3.4 mol of isophorone diisocyanate to the flask, continue to raise the temperature to 80-88°C, add 0.05-0.1 mol of dibutyltin dilaurate as a catalyst, and react under mechanical stirring for 1-2 h to obtain a polyurethane intermediate 3'. S3: After adjusting the temperature to 48-55°C, react with 3.1-3.4 mol of hydroxyethyl methacrylate for 3.5-4 h to obtain a vinyl-terminated polyurethane prepolymer B.

7. The method for preparing the composition according to any one of claims 1 to 6, characterized in that: The steps include: The vinyl-terminated polyurethane prepolymer, reactive diluent and auxiliary agent are weighed in parts by weight, mixed evenly, and dispersed in a high-speed disperser at 2800-3500 rpm for 70-85 minutes to obtain the coating composition.

8. Use of the composition according to any one of claims 1 to 6 in EB coating.

9. The use according to claim 8, characterized in that The preparation method of the EB coating comprises the following steps: The surface of the substrate is pretreated, and then the composition is coated on the surface of the substrate, and EB radiation curing is adopted in a protective gas atmosphere to obtain a composite material with an EB coating.

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