Epoxy resin coating as well as preparation method and application thereof

Abstract

The invention provides an epoxy resin coating as well as a preparation method and application thereof, and belongs to the technical field of abrasive belts. The epoxy resin coating provided by the invention comprises a component A and a component B, the component A is prepared from the following raw materials in parts by mass: 30-40 parts of modified epoxy resin, 0.5-1 part of glutamic acid modified graphene oxide, 2-3 parts of micron-sized aluminum powder, 0.5-1.5 parts of a dispersing agent and 20-30 parts of a first diluent; and the component B is prepared from the following raw materials in parts by mass: 20-25 parts of a curing agent and 10-15 parts of a second diluent. The modified epoxy resin is used as a matrix, and glutamic acid modified graphene oxide and micron-sized aluminum powder can synergistically improve the corrosion resistance of the coating. Experimental results show that the surface of a coating prepared from the epoxy resin coating provided by the invention is free of whitening, bubbling and softening phenomena after being corroded by 5% H2SO4 and 5% NaOH for 200 hours.

Description

Technical Field

[0001] The invention belongs to the technical field of epoxy resin coatings, and in particular relates to an epoxy resin coating and a preparation method and application thereof. Background Art

[0002] Metal materials have excellent mechanical properties and are widely used in the industrial field. The corrosion problem of metal structures has always been a severe challenge. With the development of industry, the anti-corrosion requirements for metal structures are getting higher and higher. Epoxy resin paint is a commonly used anti-corrosion coating with high mechanical strength, chemical resistance and good anti-corrosion performance. However, the epoxy resin paint on the market currently evaporates water during the curing process, which is prone to produce a large number of micropores and defects, causing corrosive media to penetrate through the coating to the metal surface, affecting the corrosion resistance of the coating, causing metal corrosion, and it is difficult to meet the needs of practical applications.

[0003] Therefore, how to improve the corrosion resistance of epoxy resin coatings has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0004] The purpose of the present invention is to provide an epoxy resin coating and a preparation method and application thereof. The epoxy resin coating provided by the present invention has excellent corrosion resistance.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides an epoxy resin coating, comprising a component A and a component B;

[0007] The component A is prepared from the following raw materials in parts by weight:

[0008] 30-40 parts of modified epoxy resin, 0.5-1 parts of glutamic acid modified graphene oxide, 2-3 parts of micron-sized aluminum powder, 0.5-1.5 parts of dispersant and 20-30 parts of first diluent;

[0009] The component B is prepared from the following raw materials in parts by weight:

[0010] 20-25 parts of curing agent and 10-15 parts of second diluent.

[0011] Preferably, the component A is prepared from raw materials including the following parts by weight:

[0012] 33-37 parts of modified epoxy resin, 0.6-0.8 parts of glutamic acid modified graphene oxide, 2.2-2.8 parts of micron-sized aluminum powder, 0.8-1.2 parts of dispersant and 22-28 parts of first diluent.

[0013] Preferably, the preparation method of the modified epoxy resin comprises:

[0014] The maleic acid monoester and the multifunctional epoxy resin are mixed and subjected to grafting reaction to obtain the modified epoxy resin.

[0015] Preferably, the particle size of the micron-sized aluminum powder is 50 to 300 μm.

[0016] Preferably, the component B is prepared from raw materials including the following parts by weight:

[0017] 22-24 parts of curing agent and 12-14 parts of second diluent.

[0018] Preferably, the curing agent is an acid anhydride curing agent.

[0019] Preferably, the first diluent and the second diluent comprise ketones.

[0020] Preferably, the mass ratio of component A to component B is 1:(0.5-0.8).

[0021] The present invention also provides a method for preparing the epoxy resin coating described in the above technical solution, comprising the following steps:

[0022] (1) mixing a modified epoxy resin, glutamic acid-modified graphene oxide, micron-sized aluminum powder, a dispersant and a first diluent to obtain a component A;

[0023] (2) mixing the curing agent and the second diluent to obtain component B;

[0024] (3) mixing component A and component B to obtain an epoxy resin coating;

[0025] There is no order of precedence for steps (1) and (2).

[0026] The present invention also provides the use of the epoxy resin coating described in the above technical solution or the epoxy resin coating prepared by the preparation method described in the above technical solution in ship ballast water tanks and drinking water tanks.

[0027] The invention provides an epoxy resin coating, comprising a component A and a component B; the component A is prepared from raw materials including the following parts by mass: 30 to 40 parts of modified epoxy resin, 0.5 to 1 part of glutamic acid-modified graphene oxide, 2 to 3 parts of micron-grade aluminum powder, 0.5 to 1.5 parts of a dispersant and 20 to 30 parts of a first diluent; the component B is prepared from raw materials including the following parts by mass: 20 to 25 parts of a curing agent and 10 to 15 parts of a second diluent. The present invention uses modified epoxy resin as a matrix, and glutamic acid modified graphene oxide and micron-sized aluminum powder can synergistically improve the corrosion resistance of the coating; wherein, glutamic acid modified graphene oxide has good dispersibility, and can be evenly distributed in the epoxy resin coating, and graphene oxide has a unique two-dimensional layered structure and a high specific surface area, can be closely attached to the coating surface, and can fill the micropores in the coating, hinder the invasion of corrosive media, and form a physical barrier, and the large amount of carboxyl and amino groups introduced can form complexes with metal ions, reduce the activity of metal ions, play a role in inhibiting the corrosion of metals, and enhance the overall anti-corrosion performance of the coating; micron-sized aluminum powder will corrode first when facing corrosion, protecting steel from corrosion. Experimental results show that the coating prepared by the epoxy resin coating provided by the present invention has no whitening, blistering and softening on the coating surface after 200h of corrosion by 5% H2SO4 and 5% NaOH. DETAILED DESCRIPTION

[0028] The present invention provides an epoxy resin coating, comprising a component A and a component B;

[0029] The component A is prepared from the following raw materials in parts by weight:

[0030] 30-40 parts of modified epoxy resin, 0.5-1 parts of glutamic acid modified graphene oxide, 2-3 parts of micron-sized aluminum powder, 0.5-1.5 parts of dispersant and 20-30 parts of first diluent;

[0031] The component B is prepared from the following raw materials in parts by weight:

[0032] 20-25 parts of curing agent and 10-15 parts of second diluent.

[0033] The present invention has no particular limitation on the sources of the raw materials, and commercially available products known to those skilled in the art may be used.

[0034] The epoxy resin coating provided by the invention comprises component A.

[0035] In terms of mass fraction, the raw materials for preparing the component A of the present invention include 30 to 40 parts of modified epoxy resin. As an embodiment, the mass fraction of the modified epoxy resin can be 33 to 37 parts, or 35 to 36 parts. In the present invention, the modified epoxy resin retains a large number of epoxy groups, has a high epoxy value, can form a dense three-dimensional network structure after curing, and can improve the corrosion resistance of the coating.

[0036] In the present invention, the preparation method of the modified epoxy resin preferably comprises:

[0037] The maleic acid monoester and the multifunctional epoxy resin are mixed and subjected to grafting reaction to obtain the modified epoxy resin.

[0038] In the present invention, the method for preparing the maleic acid monoester preferably comprises:

[0039] Maleic anhydride, a long-chain alcohol and an organic solvent are mixed and subjected to alcoholysis reaction to obtain maleic acid monoester.

[0040] In the present invention, the long-chain alcohol preferably includes perfluorooctanol, perfluorobutanol, octadecyl alcohol or hydroxy silicone oil.

[0041] In the present invention, the organic solvent preferably includes toluene. The present invention has no special requirements on the amount of the organic solvent, as long as it can completely dissolve maleic anhydride and long-chain alcohol.

[0042] In the present invention, the molar ratio of maleic anhydride to long-chain alcohol is preferably (1-2):(1-2), more preferably 1:1.

[0043] The present invention has no special limitation on the operation of mixing the maleic anhydride, the long-chain alcohol and the organic solvent, and the technical scheme for preparing the mixed material well known to those skilled in the art can be adopted.

[0044] In the present invention, the temperature of the alcoholysis reaction is preferably 70-90°C; the time of the alcoholysis reaction is preferably 2-5h, more preferably 3h; the alcoholysis reaction is preferably carried out under stirring conditions, and the stirring rate is preferably 200-300r / min; the alcoholysis reaction is preferably carried out in an oil bath.

[0045] In the present invention, the multifunctional epoxy resin is preferably a tetrafunctional epoxy resin; the epoxy value of the multifunctional epoxy resin is preferably 0.90 to 0.96.

[0046] The present invention has no particular limitation on the specific type of the tetrafunctional epoxy resin, and any tetrafunctional epoxy resin well known to those skilled in the art may be used.

[0047] As an implementation mode, the tetrafunctional epoxy resin may be epoxy resin AG-601.

[0048] In the present invention, the molar ratio of the carboxyl group in the maleic acid monoester to the epoxy group in the multifunctional epoxy resin is preferably 1:(2-4), more preferably 1:(2.5-3.5).

[0049] In the present invention, the maleic acid monoester and the multifunctional epoxy resin are preferably mixed by dropping the maleic acid monoester into the multifunctional epoxy resin. The present invention has no special requirements on the dropping rate, and it can be added drop by drop.

[0050] In the present invention, the temperature of the grafting reaction is preferably 65-80°C, more preferably 75°C; the grafting reaction is preferably carried out under stirring; the stirring rate is preferably 200-300 r / min. The present invention has no special limitation on the time of the grafting reaction, as long as the acid value of the reaction system is less than 10% of the initial acid value.

[0051] Based on 30 to 40 parts of modified epoxy resin, the raw materials for preparing the component A of the present invention also include 0.5 to 1 part of glutamic acid modified graphene oxide. As an embodiment, the mass fraction of the glutamic acid modified graphene oxide can be 0.6 to 0.8 parts, or even 0.7 parts. In the present invention, the glutamic acid modified graphene oxide can synergistically improve the corrosion resistance of the coating with micron-sized aluminum powder.

[0052] The present invention has no special limitation on the source of the glutamic acid-modified graphene oxide, and it can be prepared by a preparation method well known to those skilled in the art.

[0053] Based on 30 to 40 parts of modified epoxy resin, the raw materials for preparing the component A of the present invention also include 2 to 3 parts of micron-sized aluminum powder. As an embodiment, the mass fraction of the micron-sized aluminum powder can be 2.2 to 2.8 parts, or 2.4 to 2.6 parts. In the present invention, the micron-sized aluminum powder can synergistically improve the corrosion resistance of the coating with glutamic acid-modified graphene oxide.

[0054] In the present invention, the particle size of the micron-sized aluminum powder is preferably 50 to 300 μm. The present invention limits the particle size of the micron-sized aluminum powder within the above range, which can avoid the particle size being too small, the specific surface area being too large, and the coating being corroded too quickly, and can also avoid the particle size being too large, the dispersion in the coating being poor, the formation of large gaps, and the reduction of surface adhesion and liquid penetration resistance.

[0055] Based on 30 to 40 parts of modified epoxy resin, the raw materials for preparing the component A of the present invention also include 0.5 to 1.5 parts of dispersant. As an embodiment, the mass fraction of the dispersant can be 0.8 to 1.2 parts, or 1.0 parts. In the present invention, the dispersant can improve the dispersibility of each component, thereby improving the corrosion resistance of the coating.

[0056] The present invention has no particular limitation on the type of the dispersant, and any dispersant well known to those skilled in the art may be used.

[0057] Based on 30 to 40 parts of the modified epoxy resin, the raw materials for preparing the component A of the present invention also include 20 to 30 parts of a first diluent. As an embodiment, the mass fraction of the first diluent can be 22 to 28 parts, or 24 to 26 parts. In the present invention, the first diluent is used to dissolve the component A.

[0058] In the present invention, the first diluent preferably includes ketones. The present invention has no particular limitation on the specific type of the ketones, and any ketones well known to those skilled in the art can be used.

[0059] As an embodiment, the first diluent may be acetone.

[0060] The epoxy resin coating provided by the invention also includes component B.

[0061] The raw materials for preparing the second component of the present invention include 20 to 25 parts by weight of a curing agent. As an embodiment, the curing agent may be 22 to 24 parts by weight, or may be 23 parts by weight. In the present invention, the curing agent can cure the modified epoxy resin.

[0062] In the present invention, the curing agent preferably includes an anhydride curing agent. The present invention has no particular limitation on the specific type of the anhydride curing agent, and an anhydride curing agent well known to those skilled in the art can be used.

[0063] As an implementation, the acid anhydride curing agent may be methyltetrahydrophthalic anhydride.

[0064] Based on 20 to 25 parts of the curing agent, the raw materials for preparing the component B of the present invention also include 10 to 15 parts of the second diluent. As an embodiment, the mass fraction of the second diluent can be 12 to 14 parts, or even 13 parts. In the present invention, the second diluent is used to dissolve the component B.

[0065] In the present invention, the second diluent preferably includes ketones. The present invention has no particular limitation on the specific type of the ketones, and any ketones well known to those skilled in the art can be used.

[0066] As an embodiment, the second diluent may be acetone.

[0067] In the present invention, the mass ratio of component A to component B is preferably 1:(0.5-0.8). As an embodiment, the mass ratio of component A to component B may be 1:(0.6-0.7). The present invention limits the mass ratio of component A to component B within the above range to further improve the corrosion resistance of the coating.

[0068] The present invention uses modified epoxy resin as a matrix, and glutamic acid-modified graphene oxide and micron-sized aluminum powder can synergistically improve the corrosion resistance of the coating; wherein, the glutamic acid-modified graphene oxide has good dispersibility and can be evenly distributed in the epoxy resin coating; the graphene oxide has a unique two-dimensional layered structure and a high specific surface area, can be tightly attached to the surface of the coating, and can fill the micropores in the coating to hinder the invasion of corrosive media and form a physical barrier; and a large number of introduced carboxyl groups and amino groups can form complexes with metal ions, reduce the activity of the metal ions, play a corrosion inhibition role on the metal, and enhance the overall corrosion resistance of the coating; the micron-sized aluminum powder will corrode first when facing corrosion, protecting the steel from corrosion.

[0069] The present invention also provides a method for preparing the epoxy resin coating described in the above technical solution, comprising the following steps:

[0070] (1) mixing a modified epoxy resin, glutamic acid-modified graphene oxide, micron-sized aluminum powder, a dispersant and a first diluent to obtain a component A;

[0071] (2) mixing the curing agent and the second diluent to obtain component B;

[0072] (3) mixing component A and component B to obtain an epoxy resin coating;

[0073] There is no order of precedence for steps (1) and (2).

[0074] The invention mixes modified epoxy resin, glutamic acid-modified graphene oxide, micron-sized aluminum powder, a dispersant and a first diluent to obtain component A.

[0075] The present invention has no special limitation on the operation of mixing the modified epoxy resin, glutamic acid-modified graphene oxide, micron-sized aluminum powder, dispersant and first diluent, and the technical scheme for preparing the mixed material well known to those skilled in the art can be adopted.

[0076] The present invention mixes the curing agent and the second diluent to obtain component B.

[0077] The present invention has no special limitation on the operation of mixing the curing agent and the second diluent, and the technical scheme for preparing the mixed material well known to those skilled in the art can be adopted.

[0078] After obtaining component A and component B, the present invention mixes component A and component B to obtain epoxy resin coating.

[0079] The present invention has no special limitation on the operation of mixing the component A and the component B, and the technical scheme for preparing the mixed material well known to those skilled in the art can be adopted.

[0080] The preparation method provided by the invention has simple process and is suitable for industrial production.

[0081] The present invention also provides the use of the epoxy resin coating described in the above technical solution or the epoxy resin coating prepared by the preparation method described in the above technical solution in ship ballast water tanks and drinking water tanks.

[0082] The present invention has no special limitation on the application of the epoxy resin coating in the ballast water tank and drinking water tank of a ship, and the application operation familiar to those skilled in the art can be adopted.

[0083] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0084] The raw materials used in the embodiments and comparative examples are:

[0085] Tetrafunctional epoxy resin AG-601 (epoxy value: 0.90-0.96), Shanghai Huayi Resin Co., Ltd.; maleic anhydride (MAH), methyltetrahydrophthalic anhydride (curing agent), San Chemical Technology (Shanghai) Co., Ltd.;

[0086] 1H,1H,2H,2H-Perfluorooctanol, Aladdin Biochemical Technology Co., Ltd.;

[0087] Acetone (first diluent and second diluent), toluene, Aladdin Biochemical Technology Co., Ltd.;

[0088] The preparation method of modified epoxy resin is:

[0089] Weigh 9.8g of maleic anhydride and 36.4g of perfluorooctanol into a four-necked flask, add 50mL of toluene, install a thermometer, a stirring device and a reflux condenser on the four-necked flask, adjust the stirring speed to 300r / min, heat the reaction system to 90°C in an oil bath, and react for 3h to obtain maleic anhydride perfluorooctanol monoester. Add the obtained maleic anhydride perfluorooctanol monoester dropwise into a four-necked flask containing 43.48g of AG-601 (the molar ratio of the carboxyl group in maleic anhydride perfluorooctanol monoester to the epoxy group in AG-601 is 1:4), heat to 75°C, and carry out grafting reaction at a stirring speed of 300r / min. When the acid value of the system is 5% of the initial acid value, a modified epoxy resin is obtained;

[0090] The particle size of micron-grade aluminum powder is 100 μm;

[0091] The preparation method of glutamic acid modified graphene oxide is:

[0092] (1) 5 g of graphite powder, 100 mL of 98% concentrated sulfuric acid, 15 mL of phosphoric acid and 3.5 g of sodium nitrate were added to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a reflux condenser, and nitrogen was introduced for protection. The mixture was stirred at a temperature of 5° C. and a stirring rate of 400 r / min for 30 min. Then, 20 g of potassium permanganate was added and the temperature was raised to 50° C. and the stirring reaction was continued for 1.5 h. Then, the temperature was raised to 100° C. and the stirring reaction was continued for 1.5 h. After the reaction was completed, the reaction product was poured into ice water, and then 20 mL of 30% hydrogen peroxide solution was added. The mixture was allowed to stand for 10 h, and then centrifuged. The precipitate was washed 5 times with a 10% hydrochloric acid solution and distilled water, and then placed in a vacuum drying oven and dried at a temperature of 100° C. for 6 h to obtain graphene oxide.

[0093] (2) 1 g of graphene oxide, 120 mL of deionized water, 4.5 g of L-glutamic acid and 50 mL of a 40% sodium hydroxide solution were added to a three-necked flask equipped with a stirrer and a thermometer, and ultrasonically treated for 40 min at an ultrasonic frequency of 50 kHz, and then stirred for 10 h at a temperature of 45 ° C and a stirring rate of 400 r / min. After the reaction was completed, the reaction product was cooled to room temperature and then centrifuged. The precipitate was washed with anhydrous ethanol and distilled water for 5 times in sequence, and then placed in a vacuum drying oven and dried at a temperature of 55 ° C for 3 h to obtain glutamic acid modified graphene oxide;

[0094] The dispersant is German BYK wetting and dispersing agent ANTI-TERRA-U 100.

[0095] Example 1

[0096] An epoxy resin coating is composed of component A and component B;

[0097] The component A is prepared from the following raw materials in parts by weight:

[0098] 30 parts of modified epoxy resin, 1 part of glutamic acid modified graphene oxide, 2 parts of micron-sized aluminum powder, 1.5 parts of dispersant and 20 parts of first diluent;

[0099] The component B is prepared from the following raw materials in parts by weight:

[0100] 20 parts of curing agent and 15 parts of second diluent;

[0101] The mass ratio of component A to component B is 1:0.5;

[0102] The preparation method of the epoxy resin coating comprises the following steps:

[0103] (1) mixing a modified epoxy resin, glutamic acid-modified graphene oxide, micron-sized aluminum powder, a dispersant and a first diluent to obtain a component A;

[0104] (2) mixing the curing agent and the second diluent to obtain component B;

[0105] (3) Component A and component B are mixed to obtain epoxy resin coating.

[0106] Comparative Example 1

[0107] On the basis of Example 1, glutamic acid-modified graphene oxide was omitted, the mass fraction of micron-sized aluminum powder was changed to 3 parts, and other conditions were the same as those in Example 1.

[0108] Comparative Example 2

[0109] On the basis of Example 1, the micron-sized aluminum powder was omitted, the mass fraction of glutamic acid-modified graphene oxide was changed to 3 parts, and the other conditions were the same as those in Example 1.

[0110] The epoxy resin coating prepared in Example 1 and Comparative Examples 1 to 2 was degassed at 40° C. for 30 min, and finally coated on a Q235 low-carbon steel sheet and dried at 80° C. for 5 h to obtain a coating with a thickness of 200 μm. The salt water immersion resistance of the coating was tested using GB / T10834-2008, and the corrosion rate of the coating was calculated using the weight loss method. The acid and alkali resistance of the coating was analyzed according to GB / T9274-1988, and the results are shown in Table 1.

[0111] Table 1 Corrosion resistance data of coatings prepared from epoxy resin coatings of Example 1 and Comparative Examples 1-2

[0112]

[0113] Example 2

[0114] An epoxy resin coating is composed of component A and component B;

[0115] The component A is prepared from the following raw materials in parts by weight:

[0116] 40 parts of modified epoxy resin, 0.5 parts of glutamic acid-modified graphene oxide, 3 parts of micron-sized aluminum powder, 0.5 parts of dispersant and 30 parts of a first diluent;

[0117] The component B is prepared from the following raw materials in parts by weight:

[0118] 25 parts of curing agent and 10 parts of second diluent;

[0119] The mass ratio of component A to component B is 1:0.6;

[0120] Other conditions are the same as in Example 1.

[0121] Example 3

[0122] An epoxy resin coating is composed of component A and component B;

[0123] The component A is prepared from the following raw materials in parts by weight:

[0124] 35 parts of modified epoxy resin, 0.8 parts of glutamic acid-modified graphene oxide, 2.5 parts of micron-sized aluminum powder, 0.8 parts of dispersant and 25 parts of a first diluent;

[0125] The component B is prepared from the following raw materials in parts by weight:

[0126] 23 parts of curing agent and 13 parts of second diluent;

[0127] The mass ratio of component A to component B is 1:0.8;

[0128] Other conditions are the same as in Example 1.

[0129] The epoxy resin coating prepared in Examples 2 to 3 was degassed at 40° C. for 30 min, and finally coated on a Q235 low-carbon steel sheet and dried at 80° C. for 5 h to obtain a coating with a thickness of 200 μm. The salt water immersion resistance of the coating was tested using GB / T 10834-2008, and the corrosion rate of the coating was calculated using the weight loss method. The acid and alkali resistance of the coating was analyzed according to GB / T 9274-1988, and the results are shown in Table 2.

[0130] Table 2 Corrosion resistance data of coatings prepared from epoxy resin coatings of Examples 2 to 3

[0131]

[0132] It can be seen from the above embodiments and comparative examples that the epoxy resin coating provided by the present invention has excellent corrosion resistance.

[0133] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An epoxy resin coating comprising component A and component B; The component A is prepared from the following raw materials in parts by weight: 30-40 parts of modified epoxy resin, 0.5-1 parts of glutamic acid modified graphene oxide, 2-3 parts of micron-sized aluminum powder, 0.5-1.5 parts of dispersant and 20-30 parts of first diluent; The component B is prepared from the following raw materials in parts by weight: 20-25 parts of curing agent and 10-15 parts of second diluent.

2. The epoxy resin coating according to claim 1, characterized in that: The component A is prepared from the following raw materials in parts by weight: 33-37 parts of modified epoxy resin, 0.6-0.8 parts of glutamic acid modified graphene oxide, 2.2-2.8 parts of micron-sized aluminum powder, 0.8-1.2 parts of dispersant and 22-28 parts of first diluent.

3. The epoxy resin coating according to claim 1 or 2, characterized in that: The preparation method of the modified epoxy resin comprises: Maleic acid monoester and multifunctional epoxy resin are mixed and subjected to grafting reaction to obtain modified epoxy resin.

4. The epoxy resin coating according to claim 1 or 2, characterized in that: The particle size of the micron-sized aluminum powder is 50 to 300 μm.

5. The epoxy resin coating according to claim 1, characterized in that: The component B is prepared from the following raw materials in parts by weight: 22-24 parts of curing agent and 12-14 parts of second diluent.

6. The epoxy resin coating according to claim 1 or 5, characterized in that: The curing agent is an acid anhydride curing agent.

7. The epoxy resin coating according to claim 1, characterized in that: The first diluent and the second diluent include ketones.

8. The epoxy resin coating according to claim 1, characterized in that: The mass ratio of component A to component B is 1:(0.5-0.8).

9. The method for preparing the epoxy resin coating according to any one of claims 1 to 8, comprising the following steps: (1) mixing a modified epoxy resin, glutamic acid-modified graphene oxide, micron-sized aluminum powder, a dispersant and a first diluent to obtain a component A; (2) mixing the curing agent and the second diluent to obtain component B; (3) mixing component A and component B to obtain an epoxy resin coating; There is no order of precedence for steps (1) and (2).

10. Use of the epoxy resin coating according to any one of claims 1 to 8 or the epoxy resin coating prepared by the preparation method according to claim 9 in ship ballast water tanks and drinking water tanks.

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