BTA-loaded self-repairing anticorrosive coating and preparation method thereof

Abstract

The invention belongs to the technical field of anticorrosive paint, and particularly relates to a BTA-loaded self-repairing anticorrosive coating and a preparation method thereof. Comprising the following steps: mixing, heating and stirring hydroxypropyl acrylate and ethylene glycol monomethyl ether, adding azodiisobutyronitrile and benzotriazole, continuously introducing nitrogen, and stirring; adding vinyltriethoxysilane and acrylic acid, stirring, continuing to add polyethyleneimine, and stirring to obtain BTA gel; carrying out vacuum drying on the BTA gel to obtain a BTA gel solid product, freeze-drying, and grinding to obtain BTA gel powder; adding the BTA gel powder into a mixture of bisphenol A diglycidyl ether and a polyether amine curing agent, and continuously stirring to obtain a BTA-loaded self-repairing anticorrosive coating; the coating can be automatically repaired again by adjusting the pH value of the environment, BTA in the coating also plays a slow release role again, the long-term corrosion resistance of the coating is improved, and the coating is suitable for various metal materials, meets the strategic requirements of sustainable development and has the characteristic of improving the corrosion resistance of the metal for a long time.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-corrosion coatings, and specifically relates to a BTA-loaded self-repairing anti-corrosion coating and a preparation method thereof. Background Art

[0002] Metal materials are widely used in various engineering projects, such as construction, transportation, chemical industry, aerospace, etc., because of their excellent mechanical properties, such as strength, hardness, wear resistance, etc., which can meet the needs of most projects. However, during long-term use, metal materials are usually exposed to a variety of external environmental factors, which can easily aggravate the oxidation and corrosion of metals, thereby affecting their structural strength and overall performance, shortening their service life, and causing huge economic losses.

[0003] Especially in harsh working environments, such as high temperature, high humidity, seawater and chemically corrosive gases, metal corrosion problems become more serious. Oxidation and corrosion of metal surfaces will not only reduce their physical functions and bearing capacity, but may also cause structural failure and even pose a threat to personnel safety. Common forms of corrosion include uniform corrosion, pitting, crevice corrosion and stress corrosion cracking. These forms of corrosion lead to a significant decrease in the durability and performance of metal materials, especially when exposed to corrosive media for a long time, the risk of corrosion and damage to the structure are more serious.

[0004] In order to solve this problem, the use of coating protection measures has become a common and effective technical means. The coating can form a protective layer on the metal surface, blocking the corrosive medium (such as moisture, oxygen, salt, etc.) from direct contact with the metal surface, thereby effectively slowing down or preventing the corrosion of the metal. The coating is usually composed of film substances, solvents, pigments and fillers. The film substance forms the main body of the coating and provides protection for the metal surface; the pigments and fillers enhance the mechanical strength, aging resistance and chemical corrosion resistance of the coating.

[0005] In recent years, water-based paint has gradually become an important material in the field of coating protection due to its environmental protection, low toxicity and excellent physical properties. Compared with traditional oil-based paints, water-based paints have lower volatile organic compound (VOC) emissions, less environmental pollution, and are safer and more reliable during storage and transportation. In addition, the film-forming process of water-based paints can be completed at room temperature, is not restricted by the shape of the workpiece, and has strong applicability.

[0006] However, although the environmental advantages and excellent performance of water-based paints are widely recognized, there are still some problems. In particular, the corrosion resistance of water-based paints is still not ideal during long-term use, and the coating is prone to peeling and cracking, resulting in poor protection effect. Summary of the invention

[0007] The purpose of the present invention is to provide a self-repairing anti-corrosion coating loaded with BTA and a preparation method thereof to solve the problems in the prior art. The coating of the present invention has good anti-corrosion performance and improves the long-term anti-corrosion ability of the coating.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a method for preparing a self-repairing anti-corrosion coating loaded with BTA, comprising the following steps: Mix hydroxypropyl acrylate and ethylene glycol methyl ether, heat and stir, add azobisisobutyronitrile and benzotriazole, continue to pass nitrogen and stir; add vinyltriethoxysilane and acrylic acid, stir and then continue to add polyethyleneimine, and stir to obtain BTA gel; vacuum dry the BTA gel to obtain a BTA gel solid product, freeze-dry and grind to obtain BTA gel powder; add the BTA gel powder to a mixture of bisphenol A diglycidyl ether and polyetheramine curing agent, and continue to stir to obtain a self-healing anti-corrosion coating loaded with BTA.

[0009] Preferably, the usage ratio of hydroxypropyl acrylate, ethylene glycol methyl ether, azobisisobutyronitrile, benzotriazole, vinyltriethoxysilane, acrylic acid and polyethyleneimine is (3-7) g: (50-150) mL: (0.1-0.2) g: (1-3) g: (8-12) g: (12-16) g: (3-6) mL.

[0010] Preferably, the mass ratio of the bisphenol A diglycidyl ether to the polyetheramine curing agent is 1:1.

[0011] Preferably, the concentration of BTA gel in the BTA-loaded self-repairing anti-corrosion coating is 2.5% to 7.5%.

[0012] Preferably, the concentration of BTA gel in the BTA-loaded self-healing anti-corrosion coating is 2.5%, 5% or 7.5%.

[0013] Preferably, the conditions for heating and stirring the hydroxypropyl acrylate and ethylene glycol methyl ether are: stirring at 70-80° C. for 30-45 minutes.

[0014] Preferably, the nitrogen is introduced for 20 to 40 minutes.

[0015] Preferably, the vacuum drying conditions for obtaining the BTA gel solid product after vacuum drying the BTA gel are: vacuum drying at 60-80° C. for 6-12 hours.

[0016] Preferably, the BTA gel powder is added to a mixture of bisphenol A diglycidyl ether and polyetheramine curing agent, and the stirring time is 2 to 3 hours in the self-repairing anti-corrosion coating loaded with BTA obtained after continuous stirring.

[0017] In a second aspect, the present invention provides a self-repairing anti-corrosion coating loaded with BTA, which is prepared by the above-mentioned preparation method.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses hydroxypropyl acrylate, ethylene glycol methyl ether, azobisisobutyronitrile, benzotriazole, vinyltriethoxysilane, acrylic acid and polyethyleneimine as raw materials, and prepares a hydrogel loaded with benzotriazole by free radical polymerization; and synthesizes a self-repairing anti-corrosion coating loaded with BTA with bisphenol A diglycidyl ether and polyetheramine curing agent. By applying the coating of the present invention on the metal surface, a physical barrier can be formed to isolate the direct contact between the metal and the corrosive particles, slowing down the corrosion rate; secondly, the gel in the coating can absorb water and swell, fill the pores in the coating, and enhance the physical barrier effect. In addition, the coating of the present invention can automatically repair the coating by adjusting the environmental pH, and the BTA in the coating will also play a slow-release role again, improving the long-term anti-corrosion ability of the coating. It is suitable for various types of metal materials, meets the requirements of the sustainable development strategy, and has the characteristics of long-term improvement of metal anti-corrosion. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to understand the characteristics and effects of the present invention, the following is a general description and definition of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used in the text are the common meanings understood by those skilled in the art for the present invention. In the event of a conflict, the definition in this specification shall prevail.

[0020] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, that is, the present invention can be implemented without being limited by any specific theory or mechanism.

[0021] In this article, all features such as values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are for simplicity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to have included and specifically disclosed all possible secondary ranges and individual values ​​within the range (including integers and fractions).

[0022] In this document, unless otherwise specified, “includes,” “including,” “contains,” “has,” or similar terms cover the meanings of “consisting of” and “mainly consisting of,” for example, “A includes a” covers the meanings of “A includes a and other” and “A only includes a.”

[0023] In this document, in order to make the description concise, not all possible combinations of various technical features in various embodiments or examples are described. Therefore, as long as there is no contradiction in the combination of these technical features, the various technical features in various embodiments or examples can be combined arbitrarily, and all possible combinations should be considered to be within the scope of this specification.

[0024] The first object of the present invention is to provide a method for preparing a self-repairing anti-corrosion coating loaded with BTA, comprising the following steps: Mix hydroxypropyl acrylate and ethylene glycol methyl ether, and stir at 70-80°C for 30-45 minutes, add azobisisobutyronitrile and benzotriazole (BTA), and continue to pass nitrogen and stir for 20-40 minutes; add vinyltriethoxysilane and acrylic acid, stir for 2-3 hours, and then continue to add polyethyleneimine, and stir for 1-1.5 hours to obtain BTA gel; vacuum dry the BTA gel at 60-80°C for 6-12 hours to obtain a BTA gel solid product, and grind it after freeze-drying to obtain BTA gel powder; add the BTA gel powder to a mixture of bisphenol A diglycidyl ether and polyetheramine curing agent, and continue stirring for 2-3 hours to obtain a self-healing anti-corrosion coating loaded with BTA.

[0025] The present invention uses hydroxypropyl acrylate and ethylene glycol methyl ether as solvents, mixes and stirs at 70-80° C., and provides a suitable solvent environment to promote the subsequent reaction. Azobisisobutyronitrile is used as an initiator, which can decompose and generate free radicals under a nitrogen atmosphere, start a polymerization reaction, and then promote the crosslinking and curing of BTA. BTA, as a self-repairing component, has excellent corrosion resistance and self-repairing function. It can form a repair structure when the coating surface is damaged, thereby extending the service life of the coating. Vinyltriethoxysilane is used as a crosslinking agent to improve the adhesion and stability of the coating and improve its adhesion to the substrate. Acrylic acid participates in the polymerization reaction as a functional monomer to enhance the mechanical properties and weather resistance of the coating. Polyethyleneimine is used as a polymer auxiliary agent to further promote the gelation and stability of BTA. The polyetheramine curing agent is mixed with bisphenol A diglycidyl ether as the final crosslinking system to ensure the curing and durability of the coating.

[0026] The present invention uses hydroxypropyl acrylate, ethylene glycol methyl ether, azobisisobutyronitrile, benzotriazole, vinyltriethoxysilane, acrylic acid and polyethyleneimine as raw materials, prepares a hydrogel loaded with benzotriazole by a free radical polymerization method, and synthesizes a self-healing anti-corrosion coating loaded with BTA with bisphenol A diglycidyl ether and polyetheramine curing agent.

[0027] The dosage ratio of hydroxypropyl acrylate, ethylene glycol methyl ether, azobisisobutyronitrile, benzotriazole, vinyltriethoxysilane, acrylic acid and polyethyleneimine is (3-7) g: (50-150) mL: (0.1-0.2) g: (1-3) g: (8-12) g: (12-16) g: (3-6) mL.

[0028] The mass ratio of the bisphenol A diglycidyl ether to the polyetheramine curing agent is 1:1.

[0029] Exemplarily, the concentration of BTA gel in the BTA-loaded self-healing anti-corrosion coating is 2.5% to 7.5%. More preferably, the concentration of BTA gel in the BTA-loaded self-healing anti-corrosion coating is 2.5%, 5% or 7.5%.

[0030] The second object of the present invention is to provide a self-repairing anti-corrosion coating loaded with BTA, which is prepared by the above-mentioned preparation method. The self-repairing anti-corrosion coating loaded with BTA of the present invention is applied to the metal surface to form a physical barrier, isolate the direct contact between the metal and the corrosive particles, and slow down the corrosion rate; secondly, the gel in the coating can absorb water and swell, fill the pores in the coating, and enhance the physical barrier effect.

[0031] The BTA gel provided by the present invention has pH sensitivity. When the pH is alkaline, the internal and external osmotic pressures of the BTA gel increase, the carboxylic acid groups in the acrylic acid in the gel dissociate, the carboxylate groups increase, and the electrostatic repulsion is enhanced, resulting in the expansion of the gaps between the gel molecular chains, and water molecules diffuse into the interior of the gel until the internal and external osmotic pressures are balanced. At this time, the coating volume becomes larger, filling the pores in the coating, and the corrosion inhibitor BTA in the coating will also continue to bind to the metal ions to form a protective film. Therefore, after the coating of the present invention is used for a long time or a part falls off, the coating can automatically repair the coating again by adjusting the environmental pH, and the BTA in the coating will also play a slow release effect again, improving the long-term anti-corrosion ability of the coating, which is suitable for various types of metal materials, meets the requirements of the sustainable development strategy, and has the characteristics of long-term improvement of metal anti-corrosion.

[0032] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0033] The following examples use conventional instruments and equipment in the art. The experimental methods in the following examples where specific conditions are not specified are usually carried out under conventional conditions or under conditions recommended by the manufacturer. The various raw materials used in the following examples are conventional commercial products unless otherwise specified, and their specifications are conventional specifications in the art. In the specification of the present invention and the following examples, unless otherwise specified, "%" means weight percentage, "part" means weight part, and ratio means weight ratio.

[0034] Example 1 This embodiment provides a method for preparing a self-repairing anti-corrosion coating loaded with BTA, specifically: (1) In a 500 ml three-necked flask, add 5 g of hydroxypropyl acrylate and 100 ml of ethylene glycol methyl ether, heat to 75 °C, and stir for 30 min; (2) Add 0.1 g of initiator azobisisobutyronitrile to the three-necked flask in step (1) above, and then add 2 g of benzotriazole (BTA), and continue to flow nitrogen for 30 min while stirring; (3) Following step (2) above, add 10 g of vinyltriethoxysilane and 15 g of acrylic acid into the three-necked flask and continue stirring for 2 h; (4) Following the above step (3), add 5 ml of polyethyleneimine (binder) and stir for 1 hour to obtain BTA gel.

[0035] (5) The BTA gel obtained above was transferred to a vacuum drying oven and vacuum dried at 70° C. for 12 h to obtain a BTA gel solid product, which was then freeze-dried and ground into BTA gel powder.

[0036] (6) Weigh 5 g of the above-mentioned BTA gel powder and add it into a beaker containing a mixture of 47.5 g of bisphenol A diglycidyl ether and 47.5 g of polyetheramine curing agent. After continuous stirring for 2 h, a self-healing anti-corrosion coating loaded with 5%-BTA was obtained.

[0037] Example 2 This embodiment provides a method for preparing a self-repairing anti-corrosion coating loaded with BTA, specifically: (1) In a 500 ml three-necked flask, add 5 g of hydroxypropyl acrylate and 100 ml of ethylene glycol methyl ether, heat to 75 °C, and stir for 30 min; (2) Add 0.1 g of initiator azobisisobutyronitrile and 2 g of benzotriazole (BTA) to the three-necked flask in step (1) above, and continue to flow nitrogen for 30 min while stirring; (3) Following step (2) above, add 10 g of vinyltriethoxysilane and 15 g of acrylic acid into the three-necked flask and continue stirring for 2 h; (4) Following the above step (3), 5 ml of polyethyleneimine was added and stirred for 1 h to obtain BTA gel.

[0038] (5) The BTA gel obtained above was transferred to a vacuum drying oven and vacuum dried at 70° C. for 12 h to obtain a BTA gel solid product, which was then freeze-dried and ground into BTA gel powder.

[0039] (6) Weigh 2.5 g of the above-mentioned BTA gel powder and add it into a beaker containing a mixture of 48.75 g of bisphenol A diglycidyl ether and 48.75 g of polyetheramine curing agent. After continuous stirring for 2 h, a self-healing anti-corrosion coating loaded with 2.5%-BTA was obtained.

[0040] Example 3 This embodiment provides a method for preparing a self-repairing anti-corrosion coating loaded with BTA, specifically: (1) In a 500 ml three-necked flask, add 5 g of hydroxypropyl acrylate and 100 ml of ethylene glycol methyl ether, heat to 75 °C, and stir for 30 min; (2) Add 0.1 g of initiator azobisisobutyronitrile and 2 g of benzotriazole (BTA) to the three-necked flask in step (1) above, and continue to flow nitrogen for 30 min while stirring; (3) Following step (2) above, add 10 g of vinyltriethoxysilane and 15 g of acrylic acid into the three-necked flask and continue stirring for 2 h; (4) Following the above step (3), 5 ml of polyethyleneimine was added and stirred for 1 hour to obtain BTA gel; (5) The BTA gel obtained above was transferred to a vacuum drying oven, and vacuum dried at 70° C. for 12 h to obtain a BTA gel solid product, which was then freeze-dried and ground into BTA gel powder; (6) Weigh 7.5 g of the above-mentioned BTA gel powder and add it into a beaker containing a mixture of 46.25 g of bisphenol A diglycidyl ether and 46.25 g of polyetheramine curing agent. After continuous stirring for 2 h, a self-healing anti-corrosion coating loaded with 7.5%-BTA was obtained.

[0041] Example 4 This embodiment provides a method for preparing a self-repairing anti-corrosion coating loaded with BTA, specifically: (1) In a 500 ml three-necked flask, add 3 g of hydroxypropyl acrylate and 50 ml of ethylene glycol methyl ether, heat to 70 °C, and stir for 45 min; (2) Add 0.15 g of initiator azobisisobutyronitrile and 1 g of benzotriazole (BTA) to the three-necked flask in step (1) above, and continue to flow nitrogen for 20 min while stirring; (3) Following step (2) above, add 8 g of vinyltriethoxysilane and 12 g of acrylic acid into the three-necked flask and continue stirring for 3 h; (4) Following the above step (3), 3 ml of polyethyleneimine was added and stirred for 1.25 h to obtain BTA gel; (5) The BTA gel obtained above was transferred to a vacuum drying oven, and vacuum dried at 60° C. for 12 h to obtain a BTA gel solid product, which was then freeze-dried and ground into BTA gel powder; (6) Weigh 3 g of the above-mentioned BTA gel powder and add it into a beaker containing a mixture of 48.5 g of bisphenol A diglycidyl ether and 48.5 g of polyetheramine curing agent. After continuous stirring for 2.5 h, a self-healing anti-corrosion coating loaded with 3%-BTA was obtained.

[0042] Example 5 This embodiment provides a method for preparing a self-repairing anti-corrosion coating loaded with BTA, specifically: (1) In a 500 ml three-necked flask, add 7 g of hydroxypropyl acrylate and 150 ml of ethylene glycol methyl ether, heat to 80 °C, and stir for 40 min; (2) Add 0.2 g of initiator azobisisobutyronitrile and 3 g of benzotriazole (BTA) to the three-necked flask in step (1) above, and continue to flow nitrogen for 40 min while stirring; (3) Following step (2) above, add 12 g of vinyltriethoxysilane and 16 g of acrylic acid into the three-necked flask and continue stirring for 2.5 h; (4) Following step (3), 6 ml of polyethyleneimine was added and stirred for 1.5 h to obtain BTA gel; (5) The BTA gel obtained above was transferred to a vacuum drying oven, and vacuum dried at 80° C. for 6 h to obtain a BTA gel solid product, which was then freeze-dried and ground into BTA gel powder; (6) Weigh 6 g of the above-mentioned BTA gel powder and add it into a beaker containing a mixture of 47 g of bisphenol A diglycidyl ether and 47 g of polyetheramine curing agent. After continuous stirring for 3 h, a self-healing anti-corrosion coating loaded with 6%-BTA was obtained.

[0043] The materials obtained in Examples 1 to 3 of the present invention were tested for performance as follows: The anti-corrosion performance was evaluated by the weight loss method. Using a laboratory simulated circulating water platform, under specific water quality conditions, the prepared BTA-loaded self-repairing anti-corrosion coating was evenly brushed on the surface of the metal test piece with a thickness of 80 μm and cured for 5 days. After the curing was completed, it was hung in a simulated circulating water pipeline for a corrosion test for 10 days, and then the corrosion inhibition rate was calculated according to the change in the metal sample and the coating mass. The anti-corrosion performance of the BTA-loaded self-repairing anti-corrosion coating prepared in Examples 1 to 3 is shown in Table 1: Table 1 Anticorrosion performance of the BTA-loaded self-repairing anticorrosion coatings prepared in Examples 1 to 3

[0044] It can be seen from Table 1 that as the proportion of BTA gel increases, the anti-corrosion performance of the coating will be enhanced. When the proportion of BTA gel is too high, the anti-corrosion performance of the coating will decrease. This is because BTA gel can absorb water and swell, filling the pores in the coating, thereby enhancing the physical barrier of the coating. When the proportion of BTA gel is too high, it will reduce the interaction between the coating and the metal, resulting in a decrease in anti-corrosion performance.

[0045] Comparative Example This comparative example provides a method for preparing a self-repairing anti-corrosion coating, specifically: (1) In a 500 ml three-necked flask, add 5 g of hydroxypropyl acrylate and 100 ml of ethylene glycol methyl ether, heat to 75 °C, and stir for 30 min; (2) Add 0.1 g of initiator azobisisobutyronitrile to the three-necked flask in step (1) above, and continue to flow nitrogen for 30 minutes while stirring; (3) Following step (2) above, add 10 g of vinyltriethoxysilane and 15 g of acrylic acid into the three-necked flask and continue stirring for 2 h; (4) Following the above step (3), add 5 ml of polyethyleneimine and stir for 1 hour to obtain a gel.

[0046] (5) The gel obtained above was transferred to a vacuum drying oven and vacuum dried at 70°C for 12 h to obtain a gel solid product, which was then freeze-dried and ground into gel powder.

[0047] (6) Weigh 5 g of the above gel powder and add it to a beaker containing a mixture of 47.5 g of bisphenol A diglycidyl ether and 47.5 g of polyetheramine curing agent. After continuous stirring for 2 h, a 5% gel self-healing anti-corrosion coating was obtained. As shown in Table 2, the anti-corrosion properties of the BTA-loaded self-healing anti-corrosion coatings prepared in Example 1 and the comparative example are as follows: Table 2 Anticorrosion performance of the self-repairing anticorrosion coatings prepared in Example 1 and Comparative Example

[0048] It can be seen from Table 2 that the anti-corrosion performance of the self-repairing coating loaded with BTA prepared in Example 1 is better than that of the self-repairing coating in Comparative Example 1. This is because the self-repairing coating loaded with BTA will continue to release BTA molecules after being stimulated by external factors, and the BTA molecules and Fe atoms can form a polymer, which is adsorbed on the metal surface to form a corrosion inhibitor film, thereby improving its anti-corrosion performance.

[0049] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for preparing a self-repairing anti-corrosion coating loaded with BTA, characterized in that: The following steps are involved: Mix hydroxypropyl acrylate and ethylene glycol methyl ether, heat and stir, add azobisisobutyronitrile and benzotriazole, continue to pass nitrogen and stir; add vinyltriethoxysilane and acrylic acid, stir and then continue to add polyethyleneimine, and stir to obtain BTA gel; vacuum dry the BTA gel to obtain a BTA gel solid product, freeze-dry and grind to obtain BTA gel powder; add the BTA gel powder to a mixture of bisphenol A diglycidyl ether and polyetheramine curing agent, and continue to stir to obtain a self-healing anti-corrosion coating loaded with BTA.

2. The method for preparing a BTA-loaded self-repairing anti-corrosion coating according to claim 1, characterized in that: The dosage ratio of the hydroxypropyl acrylate, ethylene glycol methyl ether, azobisisobutyronitrile, benzotriazole, vinyltriethoxysilane, acrylic acid and polyethyleneimine is (3-7) g: (50-150) mL: (0.1-0.2) g: (1-3) g: (8-12) g: (12-16) g: (3-6) mL.

3. The method for preparing a BTA-loaded self-repairing anti-corrosion coating according to claim 1, characterized in that: The mass ratio of the bisphenol A diglycidyl ether to the polyetheramine curing agent is 1:

1.

4. The method for preparing a BTA-loaded self-repairing anti-corrosion coating according to claim 1, characterized in that: The concentration of BTA gel in the BTA-loaded self-repairing anti-corrosion coating is 2.5% to 7.5%.

5. The method for preparing a BTA-loaded self-repairing anti-corrosion coating according to claim 4, characterized in that: The concentration of BTA gel in the BTA-loaded self-repairing anti-corrosion coating is 2.5%, 5% or 7.5%.

6. The method for preparing a BTA-loaded self-repairing anti-corrosion coating according to claim 1, characterized in that: The conditions for heating and stirring the hydroxypropyl acrylate and ethylene glycol methyl ether are: stirring at 70-80° C. for 30-45 minutes.

7. The method for preparing a BTA-loaded self-repairing anti-corrosion coating according to claim 1, characterized in that: The nitrogen is introduced for 20 to 40 minutes.

8. The method for preparing a BTA-loaded self-repairing anti-corrosion coating according to claim 1, characterized in that: The vacuum drying conditions for obtaining the BTA gel solid product after vacuum drying the BTA gel are: vacuum drying at 60-80° C. for 6-12 hours.

9. The method for preparing a BTA-loaded self-repairing anti-corrosion coating according to claim 1, characterized in that: The BTA gel powder is added into a mixture of bisphenol A diglycidyl ether and polyetheramine curing agent, and the BTA-loaded self-repairing anti-corrosion coating is obtained after continuous stirring, and the stirring time is 2 to 3 hours.

10. A self-repairing anti-corrosion coating loaded with BTA, characterized in that: The method is prepared by the method according to any one of claims 1 to 9.

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