Epoxy resin anti-corrosion coating and preparation method thereof

Abstract

An epoxy resin anti-corrosion coating and a preparation method thereof belong to the technical field of coatings. The epoxy resin anti-corrosion coating of the present invention is composed of 30 to 42 parts of epoxy resin, 10 to 18 parts of amino polyarylether curing agent, 42 to 53 parts of diluent, 0 to 8 parts of pigment and filler, and 0 to 8 parts of auxiliary agent in parts by weight. The amino polyarylether curing agent prepared by the present invention has better heat resistance than common small molecule curing agents, and can maintain high mechanical properties and good thermal stability when operating at high temperatures. At the same time, the cross-linking density can be regulated by adjusting the amino content in the molecule, and the coating will not decompose during the surface drying and curing process. According to the chemical structure and curing conditions of the curing agent, the present invention can obtain a cross-linked network system with high toughness, chemical corrosion resistance, high bonding strength and other properties. The coating has fewer defects, stronger ability to block the penetration of corrosive media, can maintain a certain hydrophobicity, and has improved anti-corrosion performance.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and particularly relates to an epoxy resin anti-corrosion coating and a preparation method thereof. Background Art

[0002] Metal materials are widely used in various fields due to their excellent properties, but metal corrosion causes significant economic losses. Anti-corrosion coatings are widely used to protect metals from corrosion due to their cost-effectiveness and wide applicability. Coating performance largely depends on the properties of the resin matrix itself. Epoxy resin, with its excellent adhesion and chemical resistance, is one of the most commonly used matrix resins in anti-corrosion coatings.

[0003] Epoxy resin is a widely used and high-performance polymer material. In order to convert epoxy resin into a hard, non-sticky thermosetting network for anti-corrosion coatings, a curing crosslinking agent must be used. However, ordinary epoxy resins have poor temperature and chemical resistance after curing, which greatly limits their application and promotion. In addition, due to the high crosslinking density of epoxy resin, microcracks and holes will appear in the crosslinked network. Corrosive media molecules such as water, oxygen, and ions can penetrate into the epoxy coating through these microcracks and holes, thereby reducing the anti-corrosion performance of the epoxy coating. In actual application, the choice of epoxy resin curing agent is an important factor affecting the performance of epoxy resin coatings.

[0004] Depending on the chemical structure of the curing agent and the curing conditions, a cross-linked network system can be obtained with high toughness, chemical resistance, high strength and hardness, high bond strength, and high heat resistance. The epoxy resin anti-corrosion coating of the present invention maintains high mechanical properties and good thermal stability when operated at high temperatures. The cross-linking density can also be adjusted by adjusting the amino content to achieve the desired anti-corrosion effect. Summary of the Invention

[0005] The purpose of the present invention is to provide an epoxy resin anti-corrosion coating and a preparation method thereof. According to the chemical structure of the curing agent and the curing conditions, a cross-linked network system with high toughness, chemical corrosion resistance, high bond strength and other properties can be obtained. The coating has fewer defects, has a stronger ability to block the penetration of corrosive media, can maintain a certain hydrophobicity, and has improved anti-corrosion performance (performance parameters are shown in Table 1 and the accompanying drawings).

[0006] The epoxy resin anti-corrosion coating of the present invention is composed of 30 to 42 parts of epoxy resin, 10 to 18 parts of amino polyarylether curing agent, 42 to 53 parts of diluent, 0 to 8 parts of pigment and filler, and 0 to 8 parts of auxiliary agent in parts by weight.

[0007] The present invention also provides a method for preparing an epoxy resin anti-corrosion coating, which comprises the following steps:

[0008] (1) Under the protection of high-purity nitrogen, the reaction raw materials, salt-forming agent, and water-carrying agent are added to an organic solvent, heated to 70-90°C, stirred and dissolved for 1-3 hours, then heated to reflux and continued to stir for 3-6 hours to remove the water-carrying agent; then heated to 160-200°C, reacted for 5-10 hours, cooled to 100-110°C, and discharged into ice water to obtain a white product;

[0009] (2) The white product obtained in step (1) was crushed, and heat-washed with distilled water and anhydrous ethanol at 80-100° C. for 5-8 times under nitrogen protection, and vacuum-dried to obtain an amino polyarylene ether curing agent powder, the structural formula of which is as follows:

[0010]

[0011] M and N are positive integers, indicating the number of polymerization units; M:N is determined based on the feed ratio of 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane to dihydroxy aromatic monomers, and the molar ratio of 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane to dihydroxy aromatic monomers is 0.3 to 3:1, i.e., M:N = 0.3 to 3:1.

[0012] Ar is

[0013]

[0014] One or more of .

[0015] (3) Weigh 30 to 42 parts of epoxy resin, 42 to 53 parts of diluent, 0 to 8 parts of pigment and filler, and 0 to 8 parts of additives in parts by weight, add epoxy resin, pigment and filler, and additives to the diluent in sequence while stirring, and disperse and grind for 3 to 6 hours while stirring; then add 10 to 18 parts of amino polyarylene ether curing agent, and disperse and grind for 0.3 to 0.6 hours while stirring to obtain the epoxy resin anti-corrosion coating;

[0016] The reaction raw materials used in step (1) are a mixture of one of 4,4'-difluorodiphenyl sulfone, 4,4'-dichlorodiphenyl sulfone, and 4,4-difluorobenzophenone monomers, 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane, and a dihydroxy aromatic monomer;

[0017] The structural formulas of 4,4'-difluorodiphenyl sulfone, 4,4'-dichlorodiphenyl sulfone, and 4,4-difluorobenzophenone are shown below:

[0018]

[0019] The dihydroxy aromatic monomer is one or more of the following:

[0020]

[0021] The structural formula of 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane is shown below.

[0022]

[0023] The organic solvent used in step (1) is one or more of acetone, sulfolane (TMS), N-methylpyrrolidone (NMP) or N,N-dimethylacetamide (DMAC), and the total solid content of the reaction raw materials is 10-30% (mass percentage).

[0024] The salt-forming agent used in step (1) is anhydrous potassium carbonate (K2CO3).

[0025] The water-carrying agent used in step (1) is toluene.

[0026] The reflux temperature in step (1) is 130-150°C.

[0027] In step (1), the molar ratio of the sum of the molar amounts of 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane and the dihydroxy aromatic monomer to 4,4'-difluorodiphenyl sulfone, 4,4'-dichlorodiphenyl sulfone or 4,4-difluorobenzophenone is 0.9 to 1:1.

[0028] In step (1), the ratio of the reaction raw materials charged is 0.9 to 1:1 in terms of the molar amount of 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane to the dihydroxy aromatic monomer and the molar amount of 4,4'-difluorodiphenyl sulfone, 4,4'-dichlorodiphenyl sulfone or 4,4-difluorobenzophenone monomer; and the molar amount of 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane to the dihydroxy aromatic monomer is 0.3 to 3:1.

[0029] The molar ratio of 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane to the salt-forming agent is 1:1.1.

[0030] The volume ratio of water-containing agent to solvent is 2:3.

[0031] The epoxy resin described in step (3) is one of bisphenol A epoxy resin E44, bisphenol A epoxy resin E51, bisphenol A epoxy resin E12, bisphenol A epoxy resin E06, bisphenol A epoxy resin E03, novolac epoxy resin F-51, and glycidylamine epoxy resin AG-80;

[0032] The molecular structure of bisphenol A epoxy resin is as follows:

[0033]

[0034] K is a positive integer.

[0035] The molecular structures of phenolic epoxy resin F-51 and glycidylamine epoxy resin AG-80 are as follows:

[0036]

[0037] The diluent in step (3) is a composite solution obtained by mixing N-methylpyrrolidone, dimethylacetamide, toluene and butanone in a weight ratio of 8:4:4:1.

[0038] The pigment filler in step (3) is one or more of chrome green, titanium white, iron red, iron black, carbon black, manganese black, chromium trioxide, titanium dioxide, pearl powder, etc.

[0039] The auxiliary agent in step (3) is one or more of organic bentonite, fumed silica, polytetrafluoroethylene, etc.

[0040] The coating steps of an epoxy resin anti-corrosion coating provided by the present invention are as follows:

[0041] Add diluent to the epoxy resin anti-corrosion coating to adjust the viscosity (apply 4 cups for 50 to 70 seconds: paint cup No. 4, let the full cup of paint flow down naturally before spraying, record the time, 50 to 70 seconds is the best spraying viscosity), then use an air spray gun and an air compressor to spray the epoxy resin anti-corrosion coating with appropriate viscosity onto the sandblasted metal substrate, dry the surface at 80 to 100 ° C for 20 to 30 minutes, then heat to 150 to 180 ° C and cure for 2 to 5 hours, thereby obtaining the coating of the present invention on the surface of the metal substrate. Beneficial effects of the present invention:

[0042] 1) The amino polyarylether curing agent synthesized by the present invention can maintain high mechanical properties and good thermal stability when running at high temperature, and the crosslinking density can also be regulated by adjusting the amino content in the molecule (attached Figure 1 This is the TGA image of the E12+curing agent coating of the present invention, showing that the decomposition temperature starts at 390°C, while the decomposition temperature of conventional commercial curing agent coatings is 300°C. Compared with commercial small molecule aromatic curing agents, this is beneficial for improving the heat resistance and mechanical properties of the coating;

[0043] 2) The amino polyarylene ether curing agent synthesized in the present invention has an excellent structure, in which rigid groups and flexible groups coexist in the molecular structure, resulting in a cured coating having a high glass transition temperature (Tg), good hardness, excellent flexibility, and impact resistance. The relevant performance parameters are shown in Table 1. It can be seen that the hardness and impact resistance of the coating cured with the amino polyarylene ether curing agent of the present invention and E12 epoxy resin are significantly higher than those of the coating cured with DDS and E12 epoxy resin.

[0044] Table 1: Performance data of epoxy resin anticorrosive coatings prepared in Example 1 and Comparative Example 1

[0045]

[0046] 1. The sample coating adhesion is tested with reference to GB / T1720-1979 "Determination of paint film adhesion".

[0047] 2. The sample coating thickness is tested with reference to GB / T1764-1979 "Determination of paint film thickness".

[0048] 3. The hardness of the sample coating is tested with reference to GB / T6739-2006 "Determination of Pencil Hardness of Paint Film".

[0049] 4. The impact resistance of the sample coating is tested with reference to GB / T20624.1-2006 "Determination of impact resistance of paint film".

[0050] 3) The amino polyarylene ether curing agent prepared by the present invention has better heat resistance than common small molecule curing agents and will not decompose during the surface drying and curing process of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 : TGA curve of the epoxy resin coating prepared in Example 1; It shows that the coating prepared in Example 1 has good heat resistance;

[0052] Figure 2 : Electrochemical impedance spectroscopy Bode diagram of the amino polyarylether epoxy curing agent / epoxy resin E12 composite anti-corrosion coating prepared in Example 1. Figure 2 After the coating is immersed in 3.5% salt water for 45 days, the resistance in the low frequency region is still higher than 10 9 , indicating that the coating still has a good anti-corrosion effect;

[0053] Figure 3 : DSC curve of the epoxy resin coating prepared in Example 1; it shows that the coating prepared in Example 1 has a higher glass transition temperature (Tg=182.7°C). DETAILED DESCRIPTION

[0054] The following is a detailed description of the specific embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0055] Therefore, the embodiments described in this specification are merely the most preferred embodiments of the present invention and do not represent all technical ideas of the present invention. Therefore, it should be understood that there may be multiple equivalents and modifications that can replace these embodiments when this application is filed.

[0056] In this specification, unless the context clearly indicates otherwise, expressions in the singular include expressions in the plural. In this specification, it should be understood that the terms "comprising," "having," or "having" are intended to specify the presence of an implementation feature, number, step, constituent element, or combination thereof, and do not preclude the presence or additional possibility of one or more other features, numbers, steps, constituent elements, or combinations thereof.

[0057] In this specification, when amounts, concentrations or other values or parameters are given as ranges, preferred ranges or preferred upper limits and preferred lower limits, it should be understood that all ranges formed by any pair of upper range limits or preferred values and any lower range limits or preferred values are specifically disclosed, regardless of whether a range is disclosed separately.

[0058] Where numerical ranges are mentioned in this specification, unless otherwise stated, the ranges are intended to include the endpoints and all integers and fractions therein. It is not intended that the scope of the invention be limited to the specific values recited when defining a range.

[0059] Example 1

[0060] The specific embodiment of the present invention provides an epoxy resin anti-corrosion coating and a preparation method thereof, wherein the preparation method comprises the following steps:

[0061] (1) Under high-purity nitrogen atmosphere, 5.0850 g of 4,4'-difluorodiphenyl sulfone, 5.1276 g of 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane, 1.2133 g of 4,4'-dihydroxydiphenyl ether, and 3.0406 g of anhydrous potassium carbonate were added to a three-necked flask equipped with a mechanical stirrer, a thermometer, a water collector, a condenser, and a nitrogen protection device. 64 mL of N-methylpyrrolidone (NMP) was used as the reaction solvent. The solid content of the reaction raw materials was 15% (mass). 42 mL of toluene was added as a water carrier.

[0062] (2) The temperature was raised to 80°C and stirred to dissolve for 2 hours. The system temperature was raised to 140°C with water for 4 hours. The toluene was evaporated. The temperature was raised to 170°C for reaction for 6 hours. The temperature was then lowered to 100°C to obtain a viscous solution. The crude product was discharged in ice water to obtain a white fibrous crude product. The crude product was crushed in a grinder and then hot-washed with distilled water and anhydrous ethanol at 90°C for 6 times under nitrogen protection. After vacuum drying, 8.25g of amino polyarylene ether curing agent powder was obtained. Its structural formula is shown below.

[0063]

[0064] In this embodiment, M:N=7:3, and the amine equivalent (curing agent relative molecular mass / number of active hydrogen) is 190.

[0065] (3) Weigh 30 g of bisphenol A epoxy resin E12 and 45 g of diluent (the diluent is a composite solution obtained by mixing N-methylpyrrolidone, dimethylacetamide, toluene, and butanone in a weight ratio of 8:4:4:1). Add epoxy resin to the diluent at a stirring speed of 4000 r / min, and disperse and grind in a dispersion tank at a speed of 5000 r / min for 5 h. Then, add 16 g of amino polyarylether curing agent and disperse and grind at a speed of 2000 r / min for 0.5 h to prepare an epoxy resin anti-corrosion coating.

[0066] A diluent was added to the coating to adjust the viscosity (apply 4 cups for 60 seconds), and then the coating with appropriate viscosity was sprayed onto a sandblasted steel plate using an air spray gun and an air compressor. The surface was dried at 90°C for 25 minutes and then heated to 165°C for curing for 3.5 hours, thereby obtaining the coating of the present invention on the surface of the steel plate with a coating thickness of 60 μm.

[0067] Example 2

[0068] (1) Under high-purity nitrogen atmosphere, 5.0850 g of 4,4'-difluorodiphenyl sulfone, 5.1276 g of 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane, 1.1160 g of 4,4'-dihydroxybiphenyl, and 3.0406 g of anhydrous potassium carbonate were added to a three-necked flask equipped with a mechanical stirrer, a thermometer, a water dispenser, a condenser, and a nitrogen protection device. 64 mL of N-methylpyrrolidone (NMP) was used as the reaction solvent. The solid content of the reaction raw materials was 15%, and 42 mL of toluene was added as a water-carrying agent.

[0069] (2) The temperature was raised to 80°C and stirred for 2 hours to dissolve. The system temperature was raised to 130°C for 4 hours to remove the toluene. The temperature was raised to 170°C for 6 hours to react. The temperature was then lowered to 100°C to obtain a viscous solution. The product was discharged into ice water. The crude product was crushed in a grinder and then washed with distilled water and anhydrous ethanol at 90°C for 6 times under nitrogen protection. After vacuum drying, a polymer modified group powder was obtained. Its structural formula is shown below.

[0070]

[0071] In this embodiment, M:N=7:3, and the amine equivalent (curing agent relative molecular mass / number of active hydrogen) is 190.

[0072] (3) Weigh 30 g of bisphenol A epoxy resin E12, 45 g of diluent (the diluent is a composite solution obtained by mixing N-methylpyrrolidone, dimethylacetamide, toluene, and butanone in a weight ratio of 8:4:4:1), 4.0 g of polytetrafluoroethylene, 2.4 g of chrome green, and 0.3 g of titanium dioxide. Add epoxy resin, polytetrafluoroethylene, chrome green, and titanium dioxide to the diluent at a stirring speed of 4000 r / min, and disperse and grind in a dispersion tank at a speed of 5000 r / min for 5 h. Then, add 16 g of amino polyarylether curing agent and disperse and grind at a speed of 2000 r / min for 0.5 h to prepare an epoxy resin anti-corrosion coating.

[0073] A diluent was added to the coating to adjust the viscosity (apply 4 cups for 60 seconds), and then the coating with appropriate viscosity was sprayed onto a sandblasted steel plate using an air spray gun and an air compressor. The surface was dried at 90°C for 25 minutes and then heated to 165°C for curing for 3.5 hours, thereby obtaining the coating of the present invention on the surface of the steel plate with a coating thickness of 60 μm.

[0074] Example 3

[0075] (1) Under high-purity nitrogen atmosphere, 5.0850 g of 4,4'-difluorodiphenyl sulfone, 5.1276 g of 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane, 1.7658 g of 4,4'-(1,4-phenylenebis(oxy))diphenol, and 3.0406 g of anhydrous potassium carbonate were added to a three-necked flask equipped with a mechanical stirrer, a thermometer, a water collector, a condenser, and a nitrogen protection device. 64 mL of N-methylpyrrolidone (NMP) was used as the reaction solvent. The solid content of the reaction raw materials was 18%, and 42 mL of toluene was added as a water carrier.

[0076] (2) The temperature was raised to 80°C and stirred for 2 hours to dissolve. The system temperature was raised to 130°C for 4 hours to remove the toluene. The temperature was raised to 170°C for 6 hours to react. The temperature was then lowered to 100°C to obtain a viscous solution. The product was discharged into ice water. The crude product was crushed in a grinder and then washed with distilled water and anhydrous ethanol at 90°C for 6 times under nitrogen protection. After vacuum drying, a polymer modified group powder was obtained. Its structural formula is shown below.

[0077]

[0078] In this embodiment, M:N=7:3, and the amine equivalent (curing agent relative molecular mass / number of active hydrogen) is 190.

[0079] (3) Weigh 30 g of bisphenol A epoxy resin E12, 45 g of diluent (the diluent is a composite solution obtained by mixing N-methylpyrrolidone, dimethylacetamide, toluene, and butanone in a weight ratio of 8:4:4:1), 4.0 g of polytetrafluoroethylene, 2.4 g of chrome green, and 0.3 g of titanium dioxide. Add epoxy resin, polytetrafluoroethylene, chrome green, and titanium dioxide to the diluent at a stirring speed of 4000 r / min, and disperse and grind them in a dispersion tank at a speed of 5000 r / min for 5 h. Then, add 16 g of amino polyarylether curing agent and disperse and grind them at a speed of 2000 r / min for 0.5 h to prepare an epoxy resin anti-corrosion coating.

[0080] A diluent was added to the coating to adjust the viscosity (apply 4 cups for 60 seconds), and then the coating with appropriate viscosity was sprayed onto a sandblasted steel plate using an air spray gun and an air compressor. The surface was dried at 90°C for 25 minutes and then heated to 165°C for curing for 3.5 hours, thereby obtaining the coating of the present invention on the surface of the steel plate with a coating thickness of 60 μm.

[0081] Comparative Example 1

[0082] Preparation of epoxy resin E12 / commercial curing agent DDS anti-corrosion coating

[0083]

[0084] Weigh 30 g of bisphenol A epoxy resin E12 and 45 g of diluent (the diluent is a composite solution obtained by mixing N-methylpyrrolidone, dimethylacetamide, toluene, and butanone in a weight ratio of 8:4:4:1), add epoxy resin to the diluent at a stirring speed of 4000 r / min, and disperse and grind in a dispersion tank at a speed of 5000 r / min for 5 hours. Then, add 10 g of aromatic amine curing agent DDS, and disperse and grind at a speed of 2000 r / min for 0.5 hours to prepare an epoxy resin anti-corrosion coating.

[0085] A thinner was added to the coating to adjust the viscosity (apply 4 cups for 60 seconds), and then the coating with appropriate viscosity was sprayed onto a sandblasted steel plate using an air spray gun and an air compressor. The surface was dried at 90°C for 25 minutes and then heated to 165°C for curing for 3.5 hours, thereby obtaining the coating of the present invention on the surface of the steel plate. The coating thickness was 60 μm.

Claims

1. A method for preparing an epoxy resin anti-corrosion coating, comprising the following steps: (1) Under the protection of high-purity nitrogen, the reaction raw materials, salt-forming agent, and water-carrying agent are added to an organic solvent, heated to 70-90°C, stirred and dissolved for 1-3 hours, then heated to reflux and continued to stir for 3-6 hours to remove the water-carrying agent; then heated to 160-200°C, reacted for 5-10 hours, cooled to 100-110°C, and discharged into ice water to obtain a white product; (2) The white product obtained in step (1) was crushed, and heat-washed with distilled water and anhydrous ethanol at 80-100° C. for 5-8 times under nitrogen protection, and vacuum-dried to obtain an amino polyarylene ether curing agent powder, the structural formula of which is as follows: M and N are positive integers representing the number of polymer units; and M:N=0.3 to 3:1; Ar is One or more of; (3) Weigh 30 to 42 parts of epoxy resin, 42 to 53 parts of diluent, 0 to 8 parts of pigment and filler, and 0 to 8 parts of auxiliary agent in parts by weight, add epoxy resin, pigment and filler, and auxiliary agent to the diluent in sequence while stirring, and disperse and grind for 3 to 6 hours while stirring; then add 10 to 18 parts of amino polyarylene ether curing agent prepared in step (2), and disperse and grind for 0.3 to 0.6 hours while stirring to obtain epoxy resin anti-corrosion coating; The reaction raw materials used in step (1) are a mixture of one of 4,4'-difluorodiphenyl sulfone, 4,4'-dichlorodiphenyl sulfone, and 4,4-difluorobenzophenone monomers, 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane, and a dihydroxy aromatic monomer; the dihydroxy aromatic monomer is one or more of the following molecular structural formulas: The molar ratio of 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane to the dihydroxy aromatic monomer and to the molar ratio of 4,4'-difluorodiphenyl sulfone, 4,4'-dichlorodiphenyl sulfone or 4,4-difluorobenzophenone monomer is 0.9 to 1:1; the molar ratio of 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane to the dihydroxy aromatic monomer is 0.3 to 3:1; The epoxy resin described in step (3) is one of bisphenol A epoxy resin E44, bisphenol A epoxy resin E51, bisphenol A epoxy resin E12, bisphenol A epoxy resin E06, bisphenol A epoxy resin E03, novolac epoxy resin F-51, and glycidylamine epoxy resin AG-80; the diluent is a composite solution obtained by mixing N-methylpyrrolidone, dimethylacetamide, toluene and butanone in a weight ratio of 8:4:4:1; the pigment filler is one or more of chrome green, titanium white, iron red, iron black, carbon black, manganese black, chromium trioxide, titanium dioxide, and pearlescent powder; and the auxiliary agent is one or more of organic bentonite, fumed silica, and polytetrafluoroethylene.

2. The method for preparing an epoxy resin anticorrosive coating according to claim 1, wherein: The organic solvent used in step (1) is one or more of acetone, sulfolane, N-methylpyrrolidone or N,N-dimethylacetamide, and the weight solid content of the reaction raw materials is 10-30%.

3. The method for preparing an epoxy resin anticorrosive coating according to claim 1, wherein: The salt-forming agent used in step (1) is anhydrous potassium carbonate.

4. The method for preparing an epoxy resin anticorrosive coating according to claim 1, wherein: The water-carrying agent used in step (1) is toluene.

5. The method for preparing an epoxy resin anticorrosive coating according to claim 1, wherein: The reflux temperature in step (1) is 130-150°C.

6. An epoxy resin anti-corrosion coating, characterized in that: The method is prepared by any one of claims 1 to 5.

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