Wear-resistant, high-toughness, flame-retardant and heat-resistant BC-coated COF-WEP anticorrosive paint as well as preparation method and coating thereof

Abstract

The invention discloses a wear-resistant, high-toughness, flame-retardant and heat-resistant BC-coated COF-WEP anticorrosive coating as well as a preparation method and a coating thereof, relates to the technical field of coatings, and aims to solve the problems that an existing epoxy resin flame-retardant material is poor in flame-retardant effect, although a halogen flame-retardant medium is added to improve the flame-retardant efficiency of the coating, the corrosion rate of a metal surface is increased, and the flame-retardant effect is poor. And the service life of metal is shortened. The anticorrosive paint comprises the following components in parts by mass: 0.1-0.5 part of BC (COF), 4-6 parts of epoxy resin, 4-6 parts of a curing agent and 1-2 parts of a defoaming agent. A covalent organic framework (COF) material is synthesized in an oil-water two-phase interface by using an interfacial polymerization method, COF is grown on the surface of biomass charcoal through solvothermal reaction to prepare BC (COF), the BC (COF) and a coalescing agent are jointly dispersed in water-borne epoxy resin, and the BC (COF)-WEP anticorrosive coating is synthesized. The formed coating has good thermal stability, wear resistance, corrosion resistance, impact resistance and flame retardance, and the preparation cost of the coating is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to a wear-resistant, high-toughness, flame-retardant, and heat-resistant BC@COF-WEP anticorrosive coating and a preparation method and coating thereof. Background Art

[0002] Various metal equipment and metal pipes are widely used in industrial and agricultural production, and often have problems such as corrosion and wear. Once a fault occurs, the equipment is easily damaged, local temperature rises, and the pipe leaks, and even endangers the life safety of the operator. By developing an anti-wear, high-toughness, flame-retardant and heat-resistant anti-corrosion coating, it is not only possible to reduce the metal corrosion rate, but also to improve the wear resistance and impact resistance of the metal surface, and to flame-retardant and heat-insulate the equipment with abnormal temperature rise, thereby improving the safety of the equipment.

[0003] Flame retardant materials mainly include high-efficiency flame retardants and thermosetting flame retardant materials. Among them, common flame retardants are chlorine-based and bromine-based flame retardants. Chlorine-based flame retardants are low in price and poor in thermal stability; bromine-based flame retardants have high flame retardant efficiency, but are prone to release toxic fumes, causing harm to the human body and the environment. Epoxy resin, as a thermosetting material, has certain flame retardant capabilities, but single-component epoxy resin has poor thermal stability and poor flame retardant effect, and it is difficult to meet the use requirements of high-temperature equipment. Although adding halogen flame retardant media to epoxy resin can improve the flame retardant efficiency of the coating, halogen flame retardant media accelerate the corrosion rate of the metal surface and shorten the service life of the metal. Therefore, there is an urgent need for an anti-corrosion coating that is flame retardant, heat-resistant, and impact-resistant. Summary of the invention

[0004] The technical problems to be solved by the present invention are:

[0005] The existing epoxy resin flame retardant material has poor flame retardant effect, and although adding halogen flame retardant medium improves the flame retardant efficiency of the coating, it has the problem of accelerating the corrosion rate of the metal surface and shortening the service life of the metal.

[0006] The present invention adopts the following technical solutions to solve the above technical problems:

[0007] The invention provides a wear-resistant, high-toughness, flame-retardant and heat-resistant BC@COF-WEP anticorrosion coating, which comprises, by mass, 0.1 to 0.5 parts of BC@COF, 4 to 6 parts of epoxy resin, 4 to 6 parts of curing agent and 1 to 2 parts of defoaming agent.

[0008] The present invention provides a method for preparing a wear-resistant, high-toughness, flame-retardant and heat-resistant BC@COF-WEP anticorrosive coating, comprising the following steps:

[0009] (1) Preparation of COF materials by interfacial polymerization;

[0010] ① Add p-dimethylaminobenzaldehyde to an organic solvent and stir until fully dissolved to obtain a p-dimethylaminobenzaldehyde solution;

[0011] ② Add p-phenylenediamine to deionized water and stir thoroughly until completely dissolved to obtain a p-phenylenediamine solution;

[0012] ③ Slowly adding p-phenylenediamine solution to p-dimethylaminobenzaldehyde solution under heating conditions, adding acetic acid for catalysis, and reacting under nitrogen atmosphere to obtain COF solution;

[0013] (2) Using the solvothermal method to grow COF on the surface of biochar to prepare BC@COF material;

[0014] ① Wash the withered plant materials and then soak them in hydrochloric acid solution;

[0015] ② Pyrolysis and carbonization of the withered plants after hydrochloric acid treatment to prepare biochar (BC);

[0016] ③ Add the prepared biochar BC to the COF solution, disperse by ultrasonic to obtain a mixed solution, perform a hydrothermal reaction on the mixed solution, filter, and dry to obtain BC@COF;

[0017] (3) Preparation of BC@COF-WEP anticorrosion coating;

[0018] ① Add BC@COF to epoxy resin emulsion, stir thoroughly and disperse by ultrasonication;

[0019] ② Add curing agent and defoaming agent, mix well, and obtain BC@COF-WEP anti-corrosion coating.

[0020] Furthermore, in step (1)①, the organic solvent is one of n-hexane, cyclohexane, N,N-dimethylformamide, dioxane or trimethylbenzene.

[0021] Furthermore, in step (1), the mass ratio of p-dimethylaminobenzaldehyde to p-phenylenediamine is 0.05:(0.2-1).

[0022] Furthermore, the pyrolysis temperature in step (2) ② is 600-800°C.

[0023] Furthermore, the hydrothermal reaction conditions in step (2) ③ are 160-200° C. for 10-14 h.

[0024] Furthermore, the drying temperature in step (2) ③ is 65-80°C.

[0025] Furthermore, in step (3)①, the ratio of epoxy resin emulsion to BC@COF is 5mL:0.1-0.5g.

[0026] The present invention provides a wear-resistant, high-toughness, flame-retardant, heat-resistant and anti-corrosion coating, wherein the anti-corrosion coating is formed by the anti-corrosion coating described in the above technical solution.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention uses an interfacial polymerization method to synthesize a covalent organic framework (COF) material at the interface of oil-water phases, grows COF on the surface of biochar by solvent thermal reaction, prepares BC@COF, and disperses BC@COF and a film-forming aid into a waterborne epoxy resin (WEP) to synthesize BC@COF-WEP. The present invention uses withered plants to burn into biochar, and uses the cross-linking effect between BC@COF-WEP and epoxy resin to form a stable network structure, which not only improves the thermal stability, wear resistance, corrosion resistance, impact resistance and flame retardancy of the coating, but also reduces the preparation cost of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is the Fourier infrared spectrum of BC@COF in the embodiment of the present invention;

[0030] Figure 2 is the Raman spectrum of BC@COF in the embodiment of the present invention;

[0031] Figure 3 This is a comparison chart of the flame retardant effect of the BC@COF-WEP coating in the embodiment of the present invention;

[0032] Figure 4 This is the thermogravimetric analysis diagram of the BC@COF-WEP coating in the embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, exemplary implementations or embodiments of the present invention will be described below in conjunction with the accompanying drawings. Obviously, the described implementations or embodiments are only implementations or embodiments of a part of the present invention, not all of them. Based on the implementations or embodiments of the present invention, all other implementations or embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present invention.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] In a typical embodiment of the present invention, a wear-resistant, high-toughness, flame-retardant and heat-resistant BC@COF-WEP anti-corrosion coating is provided, which comprises, by mass, 0.1 to 0.5 parts of BC@COF, 4 to 6 parts of epoxy resin, 4 to 6 parts of curing agent and 1 to 2 parts of defoaming agent.

[0036] In another typical embodiment of the present invention, a method for preparing a wear-resistant, high-toughness, flame-retardant, and heat-resistant BC@COF-WEP anticorrosive coating is provided, comprising the following steps:

[0037] (1) Preparation of COF materials by interfacial polymerization;

[0038] ① Add p-dimethylaminobenzaldehyde to an organic solvent and stir until fully dissolved to obtain a p-dimethylaminobenzaldehyde solution;

[0039] ② Add p-phenylenediamine to deionized water and stir thoroughly until completely dissolved to obtain a p-phenylenediamine solution;

[0040] ③ Slowly adding p-phenylenediamine solution to p-dimethylaminobenzaldehyde solution under heating conditions, adding acetic acid for catalysis, and reacting under nitrogen atmosphere to obtain COF solution;

[0041] (2) Using the solvothermal method to grow COF on the surface of biochar to prepare BC@COF material;

[0042] ① Wash the withered plant materials and then soak them in hydrochloric acid solution;

[0043] ② Pyrolysis and carbonization of the withered plants after hydrochloric acid treatment to prepare biochar (BC);

[0044] ③ Add the prepared biochar BC to the COF solution, disperse by ultrasonic to obtain a mixed solution, perform a hydrothermal reaction on the mixed solution, filter, and dry to obtain BC@COF;

[0045] (3) Preparation of BC@COF-WEP anticorrosion coating;

[0046] ① Add BC@COF to epoxy resin emulsion, stir thoroughly and disperse by ultrasonication;

[0047] ② Add curing agent and defoaming agent, mix well, and obtain BC@COF-WEP anti-corrosion coating.

[0048] The organic solvent in step (1)① is preferably one of n-hexane, cyclohexane, N,N-dimethylformamide, dioxane or trimethylbenzene.

[0049] p-phenylenediamine (C 6 H 8 N 2 ) itself can cross-link in epoxy resin to improve the acid and alkali resistance and thermal stability (flame retardant and heat resistant) of the coating. 9 H 11NO) as an important organic synthesis intermediate can react with p-phenylenediamine to prepare BC@COF. Dispersing BC@COF prepared from withered waste leaves of Hydrangea chinensis in epoxy resin can improve the anti-corrosion and physical performance indicators of the coating, which has the advantages of environmental protection and low cost.

[0050] In order to achieve a better mixing effect of the COF materials and to prepare a COF solution with fewer impurities, the mass ratio of p-dimethylaminobenzaldehyde to p-phenylenediamine in step (1) is preferably 0.05:(0.2-1).

[0051] In order to improve the pyrolysis efficiency of biomass, the pyrolysis temperature in step (2) ② is preferably 600-800°C.

[0052] The hydrothermal reaction conditions in step (2) ③ are preferably 160-200° C. for 10-14 hours. Under these conditions, the reactor is in a high temperature and high pressure state, so that BC and COF react fully and the bonding effect is better.

[0053] The drying temperature in step (2) ③ is preferably 65-80° C. Under this condition, the functional groups on the surface of BC@COF are better retained, which can both reasonably remove moisture and retain the efficiency of subsequent reactions.

[0054] Since too much epoxy resin emulsion can easily lead to a poor flame retardant and heat insulation effect of the coating, too little epoxy resin emulsion can lead to poor film-forming effect and poor physical properties of the coating, therefore, the ratio of epoxy resin emulsion to BC@COF in step (3) ① is preferably 5 mL: 0.1-0.5 g.

[0055] In another typical embodiment of the present invention, a wear-resistant, high-toughness, flame-retardant, heat-resistant and anti-corrosion coating is provided. The anti-corrosion coating is formed by the above-mentioned anti-corrosion coating, and the coating thickness is not less than 0.5 mm.

[0056] The beneficial effects of the present application will be described below in conjunction with specific embodiments and comparative examples.

[0057] Example 1

[0058] (1) Preparation of COF materials by interfacial polymerization;

[0059] ① Add 0.05 g of p-dimethylaminobenzaldehyde to 50 mL of n-hexane solvent and stir until the solute is fully dissolved to obtain a p-dimethylaminobenzaldehyde solution;

[0060] ② Add 0.2g p-phenylenediamine to 30mL of deionized water and stir thoroughly to completely dissolve the purple flake particles;

[0061] ③ Pour the p-dimethylaminobenzaldehyde solution into a three-necked flask, stir in a water bath at 60°C until the solution is evenly mixed, slowly inject the p-phenylenediamine solution, and add 6 mL of acetic acid for catalysis; seal the middle bottle mouth, pass a sufficient amount of nitrogen as a protective gas from one side, and discharge it from the other side, continue stirring to obtain a COF solution.

[0062] (2) Using the solvothermal method to grow COF on the surface of biochar to prepare BC@COF material;

[0063] ① Wash the withered hydrangea with deionized water, and then soak it in 1mmol / L dilute hydrochloric acid for 20min;

[0064] ② The withered hydrangea treated with hydrochloric acid was pyrolyzed and carbonized at a temperature of 600°C and a pyrolysis time of 8 h to prepare biochar (BC);

[0065] ③ Weigh 0.02 g of BC and add it to the COF solution prepared in step (1), and obtain a mixed solution after ultrasonic dispersion for 30 min. Pour the mixed solution into a polytetrafluoroethylene-lined reactor, react at 180° C. for 12 h, filter, and dry the solid in a vacuum drying oven at 65° C. for 6 h to obtain BC@COF.

[0066] (3) Preparation of BC@COF-WEP anticorrosion coating;

[0067] ① Weigh 0.1g BC@COF and add it to 5mL of epoxy resin emulsion. After sufficient stirring, perform ultrasonic dispersion to make it evenly dispersed in the epoxy resin.

[0068] ② Add 5 mL of curing agent and 1 mL of defoaming agent, and continue stirring to mix the coating components evenly to obtain BC@COF-WEP anticorrosive coating.

[0069] Example 2

[0070] The difference between this embodiment and embodiment 1 is that step (1) includes the following steps:

[0071] ① Add 0.05 g of p-dimethylaminobenzaldehyde to 50 mL of n-hexane solvent and stir until the solute is fully dissolved;

[0072] ② Add 0.5 g p-phenylenediamine to 30 mL of deionized water and stir thoroughly to dissolve the purple flake particles gradually;

[0073] ③ Pour the p-dimethylaminobenzaldehyde solution into a three-necked flask, stir in a water bath at 60°C until the solution is evenly mixed, slowly inject the p-phenylenediamine solution, and add 6mL of acetic acid for catalysis. Seal the middle bottle mouth, pass sufficient nitrogen gas on the left side as protective gas, and discharge from the right side.

[0074] ④ An obvious water-oil two-phase interface can be observed in the three-necked flask, and the color of the solution in the middle of the interface gradually turns to dark red. Continue stirring to form a COF solution.

[0075] Example 3

[0076] The difference between this embodiment and embodiment 1 is that step (1) includes the following steps:

[0077] ① Add 0.05 g of p-dimethylaminobenzaldehyde to 50 mL of n-hexane solvent and stir until the solute is fully dissolved;

[0078] ② Add 1.0g p-phenylenediamine to 30mL of deionized water and stir thoroughly to dissolve the purple flake particles gradually;

[0079] ③ Pour the p-dimethylaminobenzaldehyde solution into a three-necked flask, stir in a water bath at 60°C until the solution is evenly mixed, slowly inject the p-phenylenediamine solution, and add 6mL of acetic acid for catalysis. Seal the middle bottle mouth, pass sufficient nitrogen gas on the left side as protective gas, and discharge from the right side.

[0080] ④ An obvious water-oil two-phase interface can be observed in the three-necked flask, and the color of the solution in the middle of the interface gradually turns to dark red. Continue stirring to form a COF solution.

[0081] Example 4

[0082] The difference between this embodiment and embodiment 2 is that:

[0083] In step (2)①, the withered hydrangea is washed with deionized water and then immersed in 1mmol / L dilute hydrochloric acid for 40 minutes.

[0084] Example 5

[0085] The difference between this embodiment and embodiment 2 is that:

[0086] In step (2)①, the withered hydrangea is washed with deionized water and then immersed in 1mmol / L dilute hydrochloric acid for 60 minutes.

[0087] Example 6

[0088] The difference between this embodiment and embodiment 4 is that:

[0089] In step (2) ②, the withered hydrangea treated with hydrochloric acid is pyrolyzed and carbonized at a pyrolysis temperature of 700° C. for a pyrolysis time of 4 h to prepare biochar (BC);

[0090] Example 7

[0091] The difference between this embodiment and embodiment 4 is that:

[0092] In step (2)②, the withered hydrangea treated with hydrochloric acid is pyrolyzed and carbonized at a pyrolysis temperature of 800° C. for 3 h to prepare biochar (BC).

[0093] Example 8

[0094] The difference between this embodiment and embodiment 6 is that:

[0095] In step (2) ③, 0.08 g of BC was weighed and added to the COF solution prepared in step (1), and a mixed solution was obtained after ultrasonic dispersion for 30 min. The mixed solution was poured into a polytetrafluoroethylene-lined reactor, reacted at 180° C. for 12 h, filtered, and the solid was dried in a vacuum drying oven at a drying temperature of 75° C. for 5 h to obtain BC@COF.

[0096] Example 9

[0097] The difference between this embodiment and embodiment 6 is that:

[0098] In step (2) ③, 0.15 g of BC was weighed and added to the COF solution prepared in step (1), and a mixed solution was obtained after ultrasonic dispersion for 30 min. The mixed solution was poured into a polytetrafluoroethylene-lined reactor, reacted at 180° C. for 12 h, filtered, and the solid was dried in a vacuum drying oven at 80° C. for 5 h to obtain BC@COF.

[0099] Example 10

[0100] The difference between this embodiment and embodiment 6 is that:

[0101] In step (2) ③, 0.08 g of BC was weighed and added to the COF solution prepared in step (1), and a mixed solution was obtained after ultrasonic dispersion for 30 min. The mixed solution was poured into a polytetrafluoroethylene-lined reactor, reacted at 160° C. for 14 h, filtered, and the solid was dried in a vacuum drying oven at a drying temperature of 75° C. for 5 h to obtain BC@COF.

[0102] Embodiment 11

[0103] The difference between this embodiment and embodiment 6 is that:

[0104] In step (2) ③, 0.15 g of BC was weighed and added to the COF solution prepared in step (1), and a mixed solution was obtained after ultrasonic dispersion for 30 min. The mixed solution was poured into a polytetrafluoroethylene-lined reactor, reacted at 200° C. for 10 h, filtered, and the solid was dried in a vacuum drying oven at 80° C. for 5 h to obtain BC@COF.

[0105] Example 12

[0106] The difference between this embodiment and embodiment 10 is that:

[0107] In step (3) ①, 0.2 g of BC@COF was weighed and added to 4 mL of epoxy resin emulsion. After sufficient stirring, ultrasonic dispersion was performed to make it evenly dispersed in the epoxy resin.

[0108] ② Add 4 mL of curing agent and 1 mL of defoaming agent, and continue stirring to mix the coating components evenly to obtain BC@COF-WEP anticorrosive coating.

[0109] Embodiment 13

[0110] The difference between this embodiment and embodiment 10 is that:

[0111] In step (3) ①, 0.3 g of BC@COF was weighed and added to 6 mL of epoxy resin emulsion. After sufficient stirring, ultrasonic dispersion was performed to make it evenly dispersed in the epoxy resin.

[0112] ② Add 6 mL of curing agent and 2 mL of defoaming agent, and continue stirring to mix the coating components evenly to obtain BC@COF-WEP anticorrosive coating.

[0113] Embodiment 14

[0114] The difference between this embodiment and embodiment 10 is that:

[0115] In step (3) ①, 0.4 g of BC@COF was weighed and added to 5 mL of epoxy resin emulsion. After sufficient stirring, ultrasonic dispersion was performed to make it evenly dispersed in the epoxy resin.

[0116] ② Add 5 mL of curing agent and 1 mL of defoaming agent, and continue stirring to mix the coating components evenly to obtain BC@COF-WEP anticorrosive coating.

[0117] Embodiment 15

[0118] The difference between this embodiment and embodiment 10 is that:

[0119] In step (3) ①, 0.5 g of BC@COF was weighed and added to 6 mL of epoxy resin emulsion. After sufficient stirring, ultrasonic dispersion was performed to make it evenly dispersed in the epoxy resin.

[0120] ② Add 6 mL of curing agent and 2 mL of defoaming agent, and continue stirring to mix the coating components evenly to obtain BC@COF-WEP anticorrosive coating.

[0121] Comparative Example 1

[0122] Mix 4 mL of epoxy resin emulsion, 4 mL of curing agent and 1 mL of defoaming agent, and stir to mix the coating components evenly to obtain WEP anticorrosive coating.

[0123] Comparative Example 2

[0124] Mix 5 mL of epoxy resin emulsion, 5 mL of curing agent and 1 mL of defoaming agent, and stir to mix the coating components evenly to obtain WEP anticorrosive coating.

[0125] Comparative Example 3

[0126] Mix 6 mL of epoxy resin emulsion, 6 mL of curing agent and 2 mL of defoaming agent, and stir to mix the coating components evenly to obtain WEP anticorrosive coating.

[0127] The COF, BC@COF and BC@COF-WEP anticorrosive coatings obtained in Example 14 were subjected to infrared spectroscopy detection. The results are as follows: Figure 1 As shown, at 3323cm -1 It can be observed that there are obvious free NH bonds in p-phenylenediamine. After the synthesis of COF and BC@COF, the peak intensity of the NH bond decreases significantly, which proves the occurrence of nucleophilic addition reaction. The amino group in p-phenylenediamine reacts with the C=O of p-aminobenzaldehyde to form a nucleophilic addition reaction, resulting in the formation of a 1630 cm -1 The intensity of the C=O bond at 1261 cm was detected in both COF and BC@COF spectra. -1 The obvious absorption peak at , corresponds to the CN stretching vibration, which indicates that the carbonyl and amino groups react to form a CN bond. The absorption peak of the benzene ring was detected in the spectrum of BC@COF, which may be due to the chemical reaction of the surface groups of biochar.

[0128] The COF and BC@COF obtained in Example 14 were subjected to Raman detection, and the Raman spectra of the materials were tested using an INVIA Raman tester (Agilent Technologies, USA). Figure 2 As shown, the characteristic peaks corresponding to COF and BC@COF were observed, proving that the chemical reaction successfully occurred on the BC surface and COF grew on the BC surface. The detection results were consistent with FTIR.

[0129] The BC@COF-WEP coatings prepared in Examples 1 to 15 and the WEP anti-corrosion coatings prepared in Comparative Examples 1 to 3 were applied to Q235 steel sheets to form BC@COF-WEP coatings with a thickness of 0.5 mm. The coatings prepared in each example and comparative example were tested for coating adhesion according to GB / T9286-2021 "Scratch test for paint and varnish", coating flexibility according to GB / T 1731-2020 "Determination of flexibility of paint film and putty film", and coating impact resistance according to GB / T 1732-2020 "Determination of impact resistance of paint film"; and flame retardant efficiency tests were performed, such as Figure 3 As shown, the coating was heated with an alcohol lamp and the surface temperature was measured with an infrared temperature gun for 30 seconds. The results are shown in Table 1. Q235 steel has a fast heat transfer rate. After heating for 30 seconds, the temperature reaches 132°C, which can easily ignite other flammable substances and cause fires and other accidents.

[0130] Using TGA / DSC 3+ Thermogravimetric analysis was performed on the coatings of Example 14 and Comparative Example 1 using a thermogravimetric analyzer (Mettler Toledo, Switzerland). Thermogravimetric TG test was performed under the conditions of a heating rate of 10°C / min, an initial temperature of 30°C, and an end temperature of 800°C. The results are shown in FIG. Figure 4 As shown in the figure, at 249.1°C, the weight loss ratio of BC@COF-WEP is low (4.68% lower than that of WEP). When the temperature reaches 400°C, the mass loss of BC@COF-WEP is 12.01% less than that of WEP, indicating that BC@COF-WEP has good thermal stability.

[0131] Table 1

[0132]

[0133]

[0134] It can be seen from Table 1 that the physical properties of BC@COF-WEP coating have obvious advantages over WEP coating, and the thermal insulation effect is significant, which improves the flame retardant effect of the coating.

[0135] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A wear-resistant, high-toughness, flame-retardant, and heat-resistant BC@COF-WEP anticorrosive coating, characterized in that: The anticorrosive coating comprises, by mass, 0.1 to 0.5 parts of BC@COF, 4 to 6 parts of epoxy resin, 4 to 6 parts of curing agent and 1 to 2 parts of defoaming agent.

2. A method for preparing a wear-resistant, high-toughness, flame-retardant and heat-resistant BC@COF-WEP anticorrosive coating, characterized in that: The steps include: (1) Preparation of COF materials by interfacial polymerization; ① Add p-dimethylaminobenzaldehyde to an organic solvent and stir until fully dissolved to obtain a p-dimethylaminobenzaldehyde solution; ② Add p-phenylenediamine to deionized water and stir thoroughly until completely dissolved to obtain a p-phenylenediamine solution; ③ Slowly adding p-phenylenediamine solution to p-dimethylaminobenzaldehyde solution under heating conditions, adding acetic acid for catalysis, and reacting under nitrogen atmosphere to obtain COF solution; (2) Using the solvothermal method to grow COF on the surface of biochar to prepare BC@COF material; ① Wash the withered plant materials and then soak them in hydrochloric acid solution; ② Pyrolysis and carbonization of the withered plants after hydrochloric acid treatment to prepare biochar (BC); ③ Add the prepared biochar BC to the COF solution, disperse by ultrasonic to obtain a mixed solution, perform a hydrothermal reaction on the mixed solution, filter, and dry to obtain BC@COF; (3) Preparation of BC@COF-WEP anticorrosion coating; ① Add BC@COF to epoxy resin emulsion, stir thoroughly and disperse by ultrasonication; ② Add curing agent and defoaming agent, mix well, and obtain BC@COF-WEP anti-corrosion coating.

3. The method for preparing the wear-resistant, high-toughness, flame-retardant and heat-resistant BC@COF-WEP anticorrosive coating according to claim 2, characterized in that: In step (1)①, the organic solvent is one of n-hexane, cyclohexane, N,N-dimethylformamide, dioxane or trimethylbenzene.

4. The method for preparing the wear-resistant, high-toughness, flame-retardant and heat-resistant BC@COF-WEP anticorrosive coating according to claim 3, characterized in that: In step (1), the mass ratio of p-dimethylaminobenzaldehyde to p-phenylenediamine is 0.05:(0.2-1).

5. The method for preparing the wear-resistant, high-toughness, flame-retardant and heat-resistant BC@COF-WEP anticorrosive coating according to claim 4, characterized in that: The pyrolysis temperature in step (2) ② is 600-800°C.

6. The method for preparing the wear-resistant, high-toughness, flame-retardant and heat-resistant BC@COF-WEP anticorrosive coating according to claim 5, characterized in that: The conditions of the hydrothermal reaction in step (2) ③ are 160-200° C. for 10-14 hours.

7. The method for preparing the wear-resistant, high-toughness, flame-retardant and heat-resistant BC@COF-WEP anticorrosive coating according to claim 6, characterized in that: The drying temperature in step (2) ③ is 65-80°C.

8. The method for preparing the wear-resistant, high-toughness, flame-retardant and heat-resistant BC@COF-WEP anticorrosive coating according to claim 7, characterized in that: In step (3)①, the ratio of epoxy resin emulsion to BC@COF is 5mL:0.1-0.5g.

9. A wear-resistant, high-toughness, flame-retardant, heat-resistant and corrosion-resistant coating, characterized in that: The anti-corrosion coating is formed by the anti-corrosion coating according to claim 1.

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