Epoxy resin coating as well as preparation method and application thereof

Abstract

The invention relates to an epoxy resin coating as well as a preparation method and application thereof. The preparation raw materials of the epoxy resin coating comprise a component A and a component B, the component A is prepared from the following components in parts by weight: 25 to 35 parts of epoxy resin, 2 to 4 parts of castor oil modifier, 5 to 15 parts of reactive diluent and 30 to 50 parts of filler; the component B comprises the following components in parts by weight: 5-30 parts of a curing agent and 0.5-5 parts of an anti-corrosion modifier; the mass ratio of the component A to the component B is (3-8): 1. On one hand, the epoxy resin coating provided by the invention adopts the modifier to modify the epoxy resin and the curing agent, so that the epoxy resin coating has excellent adhesive force, corrosion resistance, chemical stability and high-temperature alkali resistance, and is suitable for being used in an extreme anti-corrosion environment. On the other hand, no harmful solvent is used in the preparation raw materials of the epoxy resin coating provided by the invention, so that the epoxy resin coating is high in safety and has good construction safety and environmental protection property.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coating technology, in particular to an epoxy resin coating and a preparation method and application thereof. BACKGROUND

[0002] Anti-corrosion coating has been an important branch of coating, and is widely used in industrial production. With the development of modern industry, the emergence of a batch of emerging industrial fields and the construction of many modern projects, higher requirements are put forward for the environmental capacity and service life of anti-corrosion coating. The commonly used anti-corrosion coating cannot meet these needs. The concept of "heavy-duty anti-corrosion coating" is proposed, which generally refers to the matching coating of primer and topcoat used in harsh corrosive environments. Simply speaking, heavy-duty anti-corrosion coating is a coating with longer service life and can adapt to more severe use environments. Heavy-duty anti-corrosion coating can be used for 10 years or more in chemical atmosphere and marine environment, and can be used for more than 5 years in acid, alkali, salt and solvent medium under certain temperature corrosion conditions.

[0003] At present, the most important several anti-corrosion coatings are mainly epoxy, polyurethane and zinc-rich primer coatings. Polyurethane coating has the advantages of strong adhesion, water resistance, oil resistance, solvent resistance, corrosion resistance, good elasticity, high strength, low temperature resistance, bright and hard coating, flexibility, fullness, wear resistance and scratch resistance, but it has poor gloss and color retention, has greater irritation and toxicity, poor stability and is difficult to operate. Zinc-rich primer coating has shielding effect, electrochemical protection effect, coating self-repairing and passivation effect, but the anti-corrosion performance is at the expense of zinc powder, and a large amount of zinc oxide fume will be generated during welding, which is harmful to the health of the operating personnel. Epoxy anti-corrosion coating has the advantages of excellent adhesion, excellent mechanical properties, good alkali resistance and chemical medium corrosion resistance, and high solid content, but the existing epoxy coating is mostly solvent-based coating, which contains a large amount of organic solvent. These solvents will be released during production and construction, which is harmful to the health of the operating personnel and pollutes the environment.

[0004] Therefore, how to provide a solvent-free epoxy resin coating which can be used in harsh corrosive environments has become a problem to be solved at present. SUMMARY

[0005] In order to solve the above technical problems, the present application provides an epoxy resin coating and a preparation method and application thereof. The epoxy resin is modified by a modifier and a curing agent, so that the epoxy resin coating has excellent adhesion, corrosion resistance, chemical stability and high temperature alkali resistance, and is suitable for use in extreme corrosive environments. The preparation raw material of the epoxy resin coating does not use harmful solvents, has high safety, good construction safety and environmental protection.

[0006] To achieve the above object, the present application adopts the following technical solutions:

[0007] In a first aspect, the present application provides an epoxy resin coating, the raw materials for preparing the epoxy resin coating comprising component A and component B;

[0008] The component A comprises, by weight parts:

[0009]

[0010] The component B comprises, by weight parts:

[0011] Curing agent 5-30 parts;

[0012] Anticorrosion modifier 0.5-5 parts;

[0013] The mass ratio of the component A to the component B is (3-8):1.

[0014] For example, 25-35 parts can be 25 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts or 35 parts, etc.; for example, 2-4 parts can be 2 parts, 2.5 parts, 3 parts, 3.5 parts or 4 parts, etc.; for example, 5-15 parts can be 5 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts or 15 parts, etc.; for example, 30-50 parts can be 30 parts, 35 parts, 40 parts, 45 parts or 50 parts, etc.; for example, 5-30 parts can be 5 parts, 10 parts, 15 parts, 20 parts, 25 parts or 30 parts, etc.; for example, 0.5-5 parts can be 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts, etc.; for example, (3-8):1 can be 3:1, 4:1, 5:1, 6:1, 7:1 or 8:1, etc.

[0015] In one aspect, the present application modifies the epoxy resin by using castor oil modifier, introduces castor oil molecular chain into the epoxy resin coating, and the polar hydroxyl and branched structure in the castor oil molecular chain can improve the mechanical strength, thermal stability, solvent resistance and other properties of the epoxy resin coating. The introduction of flexible long molecular chain also helps to improve the flowability of the coating and reduce the viscosity to facilitate construction. On the other hand, the present application also introduces an anticorrosion modifier into the epoxy resin coating to improve the resistance of the coating in high-concentration strong alkali environment, so as to meet the requirements of harsh use environment.

[0016] The present application limits the mass ratio of the component A to the component B to (3-8):1. If the amount of the component A is too large, the material curing effect is poor, the chemical structure of the epoxy resin coating is unstable due to insufficient curing, and the epoxy resin coating is more easily eroded by chemicals. If the amount of the component B is too large, the excess curing agent weakens the mechanical properties, stability and alkali resistance of the coating.

[0017] Preferably, the epoxy resin comprises a bisphenol A type epoxy resin and / or a bisphenol F type epoxy resin.

[0018] The bisphenol A type epoxy resin in the present application can be selected from any one or a combination of at least two of 128R of Nan Ya Plastics Corporation, Kunshan, 127E of Nan Ya Plastics Corporation, Kunshan, 828 of Guangzhou Ligao Chemical Co., Ltd., and 128 of Hongchang Electronic Materials Co., Ltd.

[0019] The bisphenol F type epoxy resin in the present application can be selected from 170 of Nan Ya Plastics Corporation, Kunshan and / or 862 of Huntsman Advanced Materials.

[0020] Preferably, the epoxy resin has an epoxy equivalent weight of 180-500 g / mol, for example, it can be 180 g / mol, 200 g / mol, 250 g / mol, 300 g / mol, 350 g / mol, 400 g / mol, 450 g / mol, or 500 g / mol, etc.

[0021] Preferably, the castor oil modifier comprises any one or a combination of at least two of castor oil, ricinoleic acid, or a salt of ricinoleic acid.

[0022] Preferably, the filler comprises any one or a combination of at least two of talc powder, mica powder, calcined kaolin, or silicon powder.

[0023] Preferably, the reactive diluent comprises any one or a combination of at least two of castor oil glycidyl ether, castor oil diglycidyl ether, or allyl phenol glycidyl ether.

[0024] Preferably, the curing agent comprises any one or a combination of at least two of a phenolic amine type epoxy curing agent, a polyamide type epoxy curing agent, or an alicyclic amine type epoxy curing agent.

[0025] The curing agent in the present application can be selected from any one or a combination of at least two of 2003D of Cadel Chemical Co., Ltd., 717 of Changshu Naisu Biological Material Science and Technology Material Co., Ltd., 715 of Changshu Naisu Biological Material Science and Technology Material Co., Ltd., R-2259 of Richem Co., Ltd., R-3224-8 of Richem Co., Ltd., and R-3217 of Richem Co., Ltd.

[0026] Preferably, the corrosion prevention modifier comprises an epoxy-based acetic ester compound.

[0027] Preferably, the epoxy-based acetic ester compound comprises any one or a combination of at least two of epoxy-based ethyl acetic ester, epoxy-based methyl acetic ester, epoxy-based propyl acetic ester, epoxy-based triacetic ester, or epoxy-based diacetic ester.

[0028] The epoxy-based acetic ester compound is used as the anticorrosion modifier, the epoxy group of the epoxy-based acetic ester compound can be reacted with the amine curing agent to be connected into the curing agent molecule, so that the extremely stable molecular structure of the epoxy-based acetic ester compound under alkaline conditions improves the alkali resistance of the coating, compared with the traditional inorganic anticorrosive agent and the organic anticorrosive agent such as isothiazolinone and organic bromine, the epoxy resin coating introduced with the epoxy-based acetic ester compound has stronger alkali resistance and thermal stability, and can better meet the anticorrosion requirements in harsh use environments.

[0029] Preferably, the A component further comprises any one or a combination of at least two of a dispersant, a defoaming agent, a coloring pigment, a rust-proof pigment, a wetting agent or a coupling agent.

[0030] Preferably, the dispersant comprises a polyurethane dispersant and / or an acrylic dispersant.

[0031] Preferably, the defoaming agent comprises a silicone defoaming agent and / or a mineral oil defoaming agent.

[0032] Preferably, the coloring pigment is any one or a combination of at least two of black iron oxide, red iron oxide, carbon black or titanium white powder.

[0033] Preferably, the rust-proof pigment comprises any one or a combination of at least two of zinc phosphate, zinc molybdate or aluminum tripolyphosphate.

[0034] Preferably, the wetting agent comprises a modified polysiloxane wetting agent.

[0035] Preferably, the coupling agent comprises a silane coupling agent.

[0036] Preferably, the A component comprises the dispersant in a weight fraction of 0.2-0.6 parts, for example, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts or 0.6 parts, etc.

[0037] Preferably, the A component comprises the defoaming agent in a weight fraction of 0.1-0.5 parts, for example, 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts or 0.5 parts, etc.

[0038] Preferably, the A component comprises the coloring pigment in a weight fraction of 2-10 parts, for example, 2 parts, 4 parts, 5 parts, 6 parts, 8 parts or 10 parts, etc.

[0039] Preferably, the A component comprises the rust-proof pigment in a weight fraction of 4-10 parts, for example, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts, etc.

[0040] Preferably, the A component comprises the wetting agent in a weight fraction of 0.1-0.5 parts, for example, 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts or 0.5 parts, etc.

[0041] Preferably, the A component comprises coupling agent 0.25-1 parts by weight, for example can be 0.25 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts or 1 part, etc.

[0042] Preferably, the solid content of the epoxy resin coating is greater than or equal to 98.5%, for example can be 98.5%, 99% or 99.5%, etc.

[0043] In a second aspect, the present application provides a preparation method of the epoxy resin coating as described in the first aspect, the preparation method of the epoxy resin coating comprising the following steps:

[0044] Preparation of A component: mix epoxy resin and castor oil modifier according to the proportion of parts by weight, react, then add optional dispersant, defoaming agent, coloring pigment, filler, anti-rust pigment, active diluent, wetting agent and coupling agent according to the proportion of parts by weight, mix to obtain A component, standby;

[0045] Preparation of B component: mix curing agent and corrosion-resistant modifier according to the proportion of parts by weight, react to obtain B component, standby.

[0046] When used, mix A component and B component to obtain the epoxy resin coating.

[0047] Preferably, the temperature of the reaction in the preparation of A component is 80-100℃, for example can be 80℃, 85℃, 90℃, 95℃ or 100℃, etc.; the time is 3-5h, for example can be 3h, 3.5h, 4h, 4.5h or 5h, etc.

[0048] Preferably, the temperature of the reaction in the preparation of B component is 20-30℃, for example can be 20℃, 25℃ or 30℃, etc.; the time is 2-5h, for example can be 2h, 2.5h, 3h, 3.5h, 4h, 4.5h or 5h, etc.

[0049] Preferably, in particular, the preparation method comprises the following steps:

[0050] (1) Preparation of A component: mix epoxy resin and castor oil modifier according to the proportion of parts by weight, react, the reaction temperature is 80-100℃, the time is 3-5h, then add optional dispersant, defoaming agent, coloring pigment, filler, anti-rust pigment and active diluent according to the proportion of parts by weight, mix and cool, after the temperature of the reaction system is cooled to 20-30℃, add wetting agent and coupling agent, obtain A component, standby;

[0051] Preparation of B component: according to the weight ratio of the curing agent and the corrosion inhibitor modifier, the reaction is carried out, the reaction temperature is 20-30℃, the time is 2-5h, and B component is obtained after the reaction is completed, which is ready for use.

[0052] (2) When in use, A component and B component are mixed according to the mass ratio of (3-8): 1 to obtain the epoxy resin coating.

[0053] Preferably, the fineness of the A component is less than or equal to 60μm, for example, it can be 30μm, 40μm, 50μm or 60μm, etc.

[0054] In a third aspect, the present application provides a use of the epoxy resin coating as described in the first aspect in anticorrosive primer.

[0055] Compared with the prior art, the present application has at least the following beneficial effects:

[0056] (1) The epoxy resin coating provided by the present application has excellent adhesion, corrosion resistance, chemical stability and high-temperature alkali resistance, and is suitable for use in petrochemical pipelines, water pipelines, gas pipelines and other extreme corrosion environments.

[0057] (2) The epoxy resin coating provided by the present application has a solid content of greater than or equal to 98.5%, does not use harmful solvents, has high safety, and has good construction safety and environmental protection.

[0058] (3) Specifically, the epoxy resin coating provided by the present application has an adhesion of 9.6-14.5MPa, an impact resistance of 40-70cm, a water resistance of more than 9 months, a resistance to 120℃ of more than 450h, and a resistance to 50% NaOH strong alkali of more than 450h. DETAILED DESCRIPTION

[0059] In order to facilitate the understanding of the present application, the present application is illustrated as follows. It should be understood by those skilled in the art that the examples are only for the purpose of understanding the present application and should not be regarded as a specific limitation of the present application.

[0060] In the following specific embodiments of the present application, the specific information of the materials used is shown as follows:

[0061] Epoxy resin, bisphenol A type epoxy resin 128R, purchased from South Asia Electronic Materials Kunshan Co., Ltd.;

[0062] Epoxy resin, bisphenol F type epoxy resin 170, purchased from South Asia Electronic Materials Kunshan Co., Ltd.;

[0063] Castor oil modifier, castor oil, purchased from Nanjing Jinhaiwei;

[0064] Castor oil modifier, castor oil acid, purchased from Jinan Runbenxiang;

[0065] Curing agent, 2003D, purchased from Caledon;

[0066] Curing agent, R-225, purchased from Richem;

[0067] Anticorrosion modifier, epoxy triacetate, purchased from Shenzhen Xingwei;

[0068] Anticorrosion modifier, epoxy ethyl acetate, purchased from Shenzhen Xingwei;

[0069] Dispersant, polyurethane dispersant BYK-161, purchased from BYK;

[0070] Defoaming agent, silicone defoaming agent BYK-066, purchased from BYK;

[0071] Coupling agent, silane coupling agent KH560 from Nanjing Shuguang Chemical;

[0072] Active diluent, castor oil glycidyl ether, purchased from Hubei Longxin;

[0073] Active diluent, allyl phenol glycidyl ether, purchased from Hubei Longxin.

[0074] Examples 1-6

[0075] Examples 1-6 respectively provide an epoxy resin coating and a preparation method thereof, and the raw material components of the epoxy resin coating are shown in Table 1 (the amount of each raw material component of the epoxy resin coating in Table 1 is in parts by weight, and “--” represents that the component is not added), wherein the preparation method is as follows:

[0076] (1) Preparation of A component: according to the weight ratio, mix the epoxy resin and castor oil modifier, and react, the reaction temperature is 90°C, and the reaction time is 4h, then according to the weight ratio, add the dispersant, defoaming agent, coloring pigment, filler, antirust pigment and active diluent for mixing and cooling, after the temperature of the reaction system is cooled to 25°C, add the wetting agent and coupling agent, to obtain the A component, for standby;

[0077] Preparation of B component: according to the weight ratio, mix the curing agent and anticorrosion modifier, and react, the reaction temperature is 25°C, and the reaction time is 4h, after the reaction is completed, the B component is obtained, for standby.

[0078] (2) When used, mix the A component and the B component according to the mass ratio of (3-8): 1, to obtain the epoxy resin coating.

[0079] Table 1

[0080]

[0081]

[0082] Comparative Example 1

[0083] This comparative example provides an epoxy resin coating and a method for preparing the same, which is different from Example 1 in that the castor oil is not contained in the A component.

[0084] Comparative Example 2

[0085] This comparative example provides an epoxy resin coating and a method for preparing the same, which is different from Example 1 in that the epoxy-based triacetate is not contained in the B component.

[0086] Comparative Example 3

[0087] This comparative example provides an epoxy resin coating and a method for preparing the same, which is different from Example 1 in that the amount of castor oil added in the A component is 1 part.

[0088] Comparative Example 4

[0089] This comparative example provides an epoxy resin coating and a method for preparing the same, which is different from Example 1 in that the amount of castor oil added in the A component is 5 parts.

[0090] Comparative Example 5

[0091] This comparative example provides an epoxy resin coating and a method for preparing the same, which is different from Example 1 in that the amount of epoxy-based triacetate added in the B component is 0.2 parts.

[0092] Comparative Example 6

[0093] This comparative example provides an epoxy resin coating and a method for preparing the same, which is different from Example 1 in that the amount of epoxy-based triacetate added in the B component is 10 parts.

[0094] Test Method

[0095] (1) Adhesion: tested according to GB / T 1720-1979 (1989) Paint Film Adhesion Test Method;

[0096] (2) Impact resistance (cm): tested according to GB / T 1732-1993 Paint Film Impact Resistance Test Method;

[0097] (3) Water resistance: tested according to GB / T9274-1988 Color Paint and Varnish Resistance to Liquid Medium Test;

[0098] (4) High temperature and strong alkali resistance: tested according to GB / T9274-1988 Paints and varnishes - Determination of resistance to liquid media, the requirements of the enterprise are that the product does not swell, does not bubble, does not rust, and does not crack for 720h under the condition of 120℃ and 50% NaOH, and the product has strong alkali resistance, and has strong alkali resistance for more than 400h.

[0099] Test results

[0100] The epoxy resin coating provided by Examples 1-6 and Comparative Examples 1-6 was tested for performance, and the performance test results are shown in Table 2 below:

[0101] Table 2

[0102]

[0103]

[0104] From the test results, it can be seen that:

[0105] (1) From Examples 1 to 6, it can be seen that the epoxy resin coating has excellent adhesion, corrosion resistance, chemical stability and high temperature alkali resistance by using the modifier to modify the epoxy resin and the curing agent, and is suitable for use in extreme corrosion prevention environment. The adhesion of the epoxy resin coating provided can reach 9.6-14.5MPa, the impact resistance can reach 40-70cm, the water resistance can be more than 9 months, and the resistance to 120℃, 50% NaOH strong alkali can be more than 450h.

[0106] (2) The water resistance and high temperature and strong alkali resistance of the epoxy resin coating provided by Example 4 are slightly decreased due to the absence of anti-rust filler, but the further addition of the anti-corrosion modifier and the castor oil modifier and other functional components in the epoxy resin coating component can make up for the partial deficiency caused by the absence of the anti-rust filler.

[0107] (3) From Examples 1 and 5-6, it can be seen that by limiting the mass ratio of component A to component B to (3-8):1, if the amount of component A is too large, the material curing effect is poor, and the chemical structure of the epoxy resin coating is unstable due to insufficient curing, and is more easily eroded by chemicals. If the amount of component B is too large, the problem of weakening the mechanical properties, stability and alkali resistance of the coating layer due to the excess of the curing agent exists.

[0108] (4) From Examples 1 and Comparative Example 1, it can be seen that when the epoxy resin coating provided by the present application does not contain the castor oil modifier in the preparation raw material, the mechanical properties and alkali resistance of the product decrease.

[0109] (5) From Examples 1 and Comparative Example 2, it can be seen that when the epoxy resin coating provided by the present application does not contain the anti-corrosion modifier in the preparation raw material, the product prepared has almost no high temperature and strong alkali resistance.

[0110] (6) It can be seen from Example 1 and Comparative Example 3-4 that when the amount of castor oil modifier added in the raw material for preparing the epoxy resin coating provided by the present application is too much, too much castor oil modifier will cause the crosslinking network inside the coating to become loose, the cohesive strength to decrease, thereby affecting the overall performance of the epoxy resin coating; when the amount of castor oil modifier added is too little, the mechanical properties of the epoxy resin coating decrease significantly, causing the coating to be prone to cracking during use, and the corrosion resistance of the epoxy resin coating is hardly improved.

[0111] (7) It can be seen from Example 1 and Comparative Example 5 that when the amount of corrosion modifier added in the raw material for preparing the epoxy resin coating provided by the present application is too little, the number of epoxy groups in the curing agent molecules decreases, and the product prepared has poor high-temperature strong-alkali resistance.

[0112] (8) It can be seen from Example 1 and Comparative Example 6 that when the amount of corrosion modifier added in the raw material for preparing the epoxy resin coating provided by the present application is too much, the brittleness of the coating increases, causing the impact resistance to deteriorate, and when the coating is subjected to water molecule penetration or is eroded by alkaline substances, due to its brittleness, cracks or tiny pores are more likely to occur, thereby accelerating the penetration of water molecules, causing the water resistance and high-temperature strong-alkali resistance to deteriorate.

[0113] The applicant declares that the above description is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. It should be understood by those skilled in the art that any changes or replacements within the technical scope disclosed by the present application can be easily conceived by those skilled in the art, and all such changes or replacements fall within the protection scope and disclosure scope of the present application.

Claims

1. An epoxy resin coating, characterized in that: The raw materials for preparing the epoxy resin coating include component A and component B; The component A comprises, by weight: The B component comprises, by weight: 5-30 parts of curing agent; 0.5-5 parts of anticorrosive modifier; The mass ratio of component A to component B is (3-8):

1.

2. The epoxy resin coating according to claim 1, characterized in that The epoxy resin includes bisphenol A epoxy resin and / or bisphenol F epoxy resin; Preferably, the epoxy equivalent weight of the epoxy resin is 180-500 g / mol.

3. The epoxy resin coating according to claim 1 or 2, characterized in that: The castor oil modifier includes any one or a combination of at least two of castor oil, ricinoleic acid or ricinoleate; Preferably, the filler comprises any one of talc powder, mica powder, calcined kaolin or silica powder, or a combination of at least two thereof; Preferably, the reactive diluent includes any one of castor oil glycidyl ether, castor oil diglycidyl ether or allylphenol glycidyl ether, or a combination of at least two thereof.

4. The epoxy resin coating according to any one of claims 1 to 3, characterized in that The curing agent includes any one of a phenolic amine epoxy curing agent, a polyamide epoxy curing agent or an alicyclic amine epoxy curing agent, or a combination of at least two of them.

5. The epoxy resin coating according to any one of claims 1 to 4, characterized in that: The anti-corrosion modifier includes epoxy acetate compounds; Preferably, the epoxy acetate compound includes any one of epoxy ethyl acetate, epoxy methyl acetate, epoxy propyl acetate, epoxy triacetate or epoxy diacetate, or a combination of at least two thereof.

6. The epoxy resin coating according to any one of claims 1 to 5, characterized in that: The component A further comprises any one or a combination of at least two of a dispersant, a defoamer, a coloring pigment, an anti-rust pigment, a wetting agent or a coupling agent; Preferably, the dispersant comprises a polyurethane dispersant and / or an acrylic dispersant; Preferably, the defoaming agent includes an organosilicon defoaming agent and / or a mineral oil defoaming agent; Preferably, the coloring pigment is any one of black iron oxide, red iron oxide, carbon black or titanium dioxide, or a combination of at least two thereof; Preferably, the anti-rust pigment comprises any one of zinc phosphate, zinc molybdate or aluminum tripolyphosphate or a combination of at least two thereof; Preferably, the wetting agent comprises a modified polysiloxane wetting agent; Preferably, the coupling agent comprises a silane coupling agent.

7. The epoxy resin coating according to claim 6, characterized in that The component A includes 0.2-0.6 parts by weight of a dispersant; Preferably, the component A comprises 0.1-0.5 parts by weight of a defoaming agent; Preferably, the component A comprises 2-10 parts by weight of a coloring pigment; Preferably, the component A comprises 4-10 parts by weight of anti-rust pigment; Preferably, the component A comprises 0.1-0.5 parts by weight of a wetting agent; Preferably, the component A includes 0.25-1 part of coupling agent by weight.

8. A method for preparing the epoxy resin coating according to any one of claims 1 to 7, characterized in that: The preparation method of the epoxy resin coating comprises the following steps: Prepare component A: Mix epoxy resin and castor oil modifier in a ratio of parts by weight, react, and then add optional dispersant, defoamer, coloring pigment, filler, rust-proof pigment, reactive diluent, wetting agent and coupling agent in a ratio of parts by weight and mix to obtain component A for later use; Preparation of component B: Mix the curing agent and the anti-corrosion modifier according to a weight ratio, react to obtain component B, and set aside.

9. The method for preparing the epoxy resin coating according to claim 8, wherein: The reaction temperature in the preparation of component A is 80-100°C and the reaction time is 3-5 hours; Preferably, the reaction temperature in the preparation of component B is 20-30° C. and the reaction time is 2-5 h.

10. Use of the epoxy resin coating according to any one of claims 1 to 7 in an anti-corrosion primer.

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