High-temperature self-repairing coating material and preparation method thereof

Abstract

The invention discloses a high-temperature self-repairing coating material and a preparation method thereof, and relates to the technical field of coating materials, the high-temperature self-repairing coating material comprises a coating material finished product, and the coating material finished product is prepared by coating material raw materials according to a certain proportion and through a series of processing treatment. The coating material comprises the following raw materials: epoxy resin, polyurethane, polyamide, a solvent, an additive, graphene, ceramic powder and a dispersing agent. According to the invention, when cracks appear in the coating material, the repairing capsule is broken to repair the cracks of the coating material, and the graphene and the ceramic powder component are mixed with the epoxy resin, so that the crack filling material is tightly combined with the coating material, and the thermal stability and the resistance of the coating material are improved; the repaired coating material is not prone to cracking and better in moisture resistance and corrosion resistance, compared with a traditional coating material, gaps of the coating material can be automatically repaired under specific conditions, the self-repairing capacity of the coating is greatly improved, and the coating material is more durable.

Description

Technical Field

[0001] The present invention relates to the technical field of coating materials, and in particular to a high-temperature self-repairing coating material and a preparation method thereof. Background Art

[0002] Coating is a solid continuous film obtained by applying the paint once. The coating obtained by general coating is relatively thin, about 20 to 50 microns, and thick paste coating can obtain a coating of more than 1 mm in one time. Coating is a thin layer of plastic applied to metal, fabric, plastic and other substrates for the purpose of protection, insulation, decoration, etc. It has different names according to the type of coating used, such as the coating of primer is called primer layer, and the coating of topcoat is called topcoat layer. Coating materials have a wide range of application prospects in aerospace, architectural decoration, metal smelting, textile and other industries.

[0003] However, in the actual application process, as the use time increases, the coating is affected by the external environment, causing itself to be corroded or eroded, resulting in cracks and other defects, which in turn affect the protective work of the coating. In addition, the existing coating materials do not have a relatively perfect self-repairing ability. As the coating defects exist for a long time, it is easy to cause the coating to fail and produce adverse effects.

[0004] Therefore, a high-temperature self-healing coating material and a preparation method thereof are proposed to solve the above problems. Summary of the invention

[0005] The purpose of the present application is to provide a high-temperature self-healing coating material and a preparation method thereof to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a high-temperature self-healing coating material, including a finished coating material, wherein the finished coating material is prepared from coating material raw materials in a certain proportion and through a series of processing treatments, and the coating material raw materials include epoxy resin, polyurethane, polyamide, solvent, additive, graphene, ceramic powder, and dispersant. The epoxy resin, polyurethane, polyamide, solvent, additive, graphene, ceramic powder, and dispersant are respectively configured according to the following percentages, namely 80 to 120 parts of epoxy resin, 30 to 40 parts of polyurethane, 15 to 20 parts of polyamide, 30 to 50 parts of solvent, 2 to 5 parts of additive, 20 to 25 parts of graphene, 20 to 25 parts of ceramic powder, and 5 to 10 parts of dispersant.

[0007] A method for preparing a high-temperature self-repairing coating material comprises the following steps:

[0008] S1: Preparation of raw materials: prepare epoxy resin, polyurethane, polyamide, solvent, additive, graphene, ceramic powder, and dispersant required for the production of external liquid, and prepare the prepared raw materials according to the proportion of 80-120 parts of epoxy resin, 30-40 parts of polyurethane, 30-40 parts of polyamide, 30-50 parts of solvent, 2-5 parts of additive, 20-25 parts of graphene, 20-25 parts of ceramic powder, and 5-10 parts of dispersant;

[0009] S2: Preparation of repair wall material: After the raw materials are prepared, the prepared polyurethane and polyamide are poured into the reactor in a certain proportion, and the polyurethane and polyamide are fully mixed. After the mixing is completed, the stirring reaction is continued for a period of time, and then the graphene is added to the mixture after the mixing reaction, and then part of the dispersant is added thereto and the stirring reaction is continued. After the stirring reaction for a period of time, the reactants are ultrasonically dispersed for a period of time. After the ultrasonic dispersion is completed, the temperature of the reactor is adjusted, and the reaction is continued. After the reaction is completed, the repair material wall material is obtained;

[0010] S3: Preparation of repair core material: After the wall material is prepared, take part of the epoxy resin and pour it into the reactor, then add part of the ceramic powder and part of the dispersant to the epoxy resin, adjust the reactor to a certain temperature, and evenly mix the epoxy resin, ceramic powder and dispersant. After the mixing is completed, keep the temperature at a certain level and continue the reaction for a period of time to obtain the core material;

[0011] S4: Preparation of repair capsules: After the wall material and the core material are prepared respectively, the obtained wall material is added to the obtained core material, and the wall material and the core material are evenly mixed in a reaction kettle, and then the mixture is adjusted to a certain temperature and reacted for a period of time and then naturally cooled. After the cooling is completed, the mixture is vacuum filtered, and then the mixture is washed and dried to obtain a repair capsule;

[0012] S5: Preparation of coating materials: After the repair capsules are prepared, the remaining epoxy resin and ceramic powder are mixed in a reactor. After uniform mixing, the solvent is added and uniformly mixed. Finally, the dispersant is added and uniformly mixed again. The mixture is placed in a reactor to react for a period of time to obtain a primary coating material. Finally, the prepared repair capsules are evenly mixed with the primary coating material. During the mixing process, additives are added. After the mixture is evenly mixed, a high-temperature self-healing coating material is obtained.

[0013] Preferably, the additives are a leveling agent, a defoaming agent and a substrate wetting agent, the ratio of the leveling agent, the defoaming agent and the substrate wetting agent is 1:0.2:3, and the amount of the additives used is 0.5% to 0.1% of the weight of the coating.

[0014] Preferably, the solvent is one or more of alcohols, ethers, ketones and esters. If multiple substances among alcohols, ethers, ketones and esters are selected as solvents, the ratio of the selected substances is 1:1:1:1.

[0015] Preferably, when preparing the wall material of the repair material, the polyurethane, polyamide, graphene and dispersant are uniformly mixed and ultrasonic dispersion is completed, and then the temperature of the reactor is adjusted to 70 to 80 degrees Celsius and reacted for 2 to 3 hours under stirring.

[0016] Preferably, when preparing the wall material of the repair material, the polyurethane, polyamide, graphene and dispersant are uniformly mixed and then ultrasonically dispersed for 20 to 30 minutes.

[0017] Preferably, when preparing the core material of the repair material, after the epoxy resin, ceramic powder and dispersant are evenly mixed, the temperature of the reactor is increased to 60-70 degrees Celsius. When the temperature is increased, the temperature of the mixture is evenly increased. After the reactor is increased to the reaction temperature, the reaction is continued for 1-1.5 hours.

[0018] Preferably, when preparing the repair capsule, after the wall material and the core material are mixed, the pH value of the mixed material needs to be adjusted to 7-8. When washing the repair capsule, acetone is selected as the detergent and the drying temperature is 50-60 degrees Celsius.

[0019] Preferably, when preparing the repair capsule, after the wall material and the core material are mixed, the temperature of the reactor is increased to 65-75 degrees Celsius. After the reactor is raised to the reaction temperature, the reaction is continued for 1.5-2 hours. During the reaction, the mixing components of the reactor are mixed and stirred simultaneously until the reaction is completed.

[0020] Preferably, when preparing the repair wall material, the rotation speed of the mixing component of the reactor is 1800-2200 revolutions per minute, when preparing the repair core material, the rotation speed of the mixing component of the reactor is 1000-1300 revolutions per minute, when preparing the repair capsule, the rotation speed of the mixing component of the reactor is 1200-1500 revolutions per minute, and when preparing the coating material, the rotation speed of the mixing component of the reactor is 2400-3000 revolutions per minute.

[0021] In summary, the technical effects and advantages of the present invention are as follows:

[0022] In the present invention, repair capsules are mixed into the coating material. When cracks appear in the coating material during long-term use, the repair capsules inside the coating material rupture and flow out to fill the gaps in the coating material, thereby repairing the coating material. The graphene and ceramic powder components in the repair capsules are mixed with the epoxy resin, so that the crack filling material and the coating material are tightly combined to repair the coating. The graphene and ceramic powder components improve the thermal stability and resistance of the coating material. The repaired coating material is not easy to crack and has better moisture resistance and corrosion resistance. Compared with traditional coating materials, the gaps in the coating material can be automatically repaired under certain circumstances, which greatly improves the self-repairing ability of the coating, and the coating material is more durable. The dispersant makes the distribution of the components of the coating material more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic flow chart of a method for preparing a high-temperature self-healing coating material proposed in this application. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0026] Embodiment 1: A high-temperature self-healing coating material, including a finished coating material, wherein the finished coating material is prepared from coating material raw materials in a certain proportion and through a series of processing treatments, wherein the coating material raw materials include epoxy resin, polyurethane, polyamide, solvent, additive, graphene, ceramic powder, and dispersant, and the epoxy resin, polyurethane, polyamide, solvent, additive, graphene, ceramic powder, and dispersant are respectively configured according to the following percentages: 80-120 parts of epoxy resin, 30-40 parts of polyurethane, 15-20 parts of polyamide, 30-50 parts of solvent, 2-5 parts of additive, 20-25 parts of graphene, 20-25 parts of ceramic powder, and 5-10 parts of dispersant.

[0027] A method for preparing a high-temperature self-repairing coating material comprises the following steps:

[0028] S1: Preparation of raw materials: prepare epoxy resin, polyurethane, polyamide, solvent, additive, graphene, ceramic powder, and dispersant required for the production of external liquid, and prepare the prepared raw materials in the proportion of 80 parts of epoxy resin, 30 parts of polyurethane, 30 parts of polyamide, 30 parts of solvent, 2 parts of additive, 20 parts of graphene, 20 parts of ceramic powder, and 5 parts of dispersant;

[0029] S2: Preparation of repair wall material: After the raw materials are prepared, the prepared polyurethane and polyamide are poured into the reactor in a certain proportion, and the polyurethane and polyamide are fully mixed. After the mixing is completed, the stirring reaction is continued for a period of time, and then the graphene is added to the mixture after the mixing reaction, and then part of the dispersant is added thereto and the stirring reaction is continued. After the stirring reaction for a period of time, the reactants are ultrasonically dispersed for a period of time. After the ultrasonic dispersion is completed, the temperature of the reactor is adjusted, and the reaction is continued. After the reaction is completed, the repair material wall material is obtained;

[0030] S3: Preparation of repair core material: After the wall material is prepared, take part of the epoxy resin and pour it into the reactor, then add part of the ceramic powder and part of the dispersant to the epoxy resin, adjust the reactor to a certain temperature, and evenly mix the epoxy resin, ceramic powder and dispersant. After the mixing is completed, keep the temperature at a certain level and continue the reaction for a period of time to obtain the core material;

[0031] S4: Preparation of repair capsules: After the wall material and the core material are prepared respectively, the obtained wall material is added to the obtained core material, and the wall material and the core material are evenly mixed in a reaction kettle, and then the mixture is adjusted to a certain temperature and reacted for a period of time and then naturally cooled. After the cooling is completed, the mixture is vacuum filtered, and then the mixture is washed and dried to obtain a repair capsule;

[0032] S5: Preparation of coating materials: After the repair capsules are prepared, the remaining epoxy resin and ceramic powder are mixed in a reactor. After uniform mixing, the solvent is added and uniformly mixed. Finally, the dispersant is added and uniformly mixed again. The mixture is placed in a reactor to react for a period of time to obtain a primary coating material. Finally, the prepared repair capsules are evenly mixed with the primary coating material. During the mixing process, additives are added. After the mixture is evenly mixed, a high-temperature self-healing coating material is obtained.

[0033] Example 2: A high-temperature self-healing coating material, including a finished coating material, wherein the finished coating material is prepared from coating material raw materials in a certain proportion and through a series of processing treatments, the coating material raw materials include epoxy resin, polyurethane, polyamide, solvent, additive, graphene, ceramic powder, and dispersant, and the epoxy resin, polyurethane, polyamide, solvent, additive, graphene, ceramic powder, and dispersant are respectively configured according to the following percentages: 80-120 parts of epoxy resin, 30-40 parts of polyurethane, 15-20 parts of polyamide, 30-50 parts of solvent, 2-5 parts of additive, 20-25 parts of graphene, 20-25 parts of ceramic powder, and 5-10 parts of dispersant.

[0034] A method for preparing a high-temperature self-repairing coating material comprises the following steps:

[0035] S1: Preparation of raw materials: prepare epoxy resin, polyurethane, polyamide, solvent, additive, graphene, ceramic powder, and dispersant required for the production of external liquid, and prepare the prepared raw materials in the proportion of 100 parts of epoxy resin, 35 parts of polyurethane, 35 parts of polyamide, 40 parts of solvent, 3 parts of additive, 22 parts of graphene, 23 parts of ceramic powder, and 7 parts of dispersant;

[0036] S2: Preparation of repair wall material: After the raw materials are prepared, the prepared polyurethane and polyamide are poured into the reactor in a certain proportion, and the polyurethane and polyamide are fully mixed. After the mixing is completed, the stirring reaction is continued for a period of time, and then the graphene is added to the mixture after the mixing reaction, and then part of the dispersant is added thereto and the stirring reaction is continued. After the stirring reaction for a period of time, the reactants are ultrasonically dispersed for a period of time. After the ultrasonic dispersion is completed, the temperature of the reactor is adjusted, and the reaction is continued. After the reaction is completed, the repair material wall material is obtained;

[0037] S3: Preparation of repair core material: After the wall material is prepared, take part of the epoxy resin and pour it into the reactor, then add part of the ceramic powder and part of the dispersant to the epoxy resin, adjust the reactor to a certain temperature, and evenly mix the epoxy resin, ceramic powder and dispersant. After the mixing is completed, keep the temperature at a certain level and continue the reaction for a period of time to obtain the core material;

[0038] S4: Preparation of repair capsules: After the wall material and the core material are prepared respectively, the obtained wall material is added to the obtained core material, and the wall material and the core material are evenly mixed in a reaction kettle, and then the mixture is adjusted to a certain temperature and reacted for a period of time and then naturally cooled. After the cooling is completed, the mixture is vacuum filtered, and then the mixture is washed and dried to obtain a repair capsule;

[0039] S5: Preparation of coating materials: After the repair capsules are prepared, the remaining epoxy resin and ceramic powder are mixed in a reactor. After uniform mixing, the solvent is added and mixed evenly. Finally, the dispersant is added and mixed evenly again. The mixture is placed in a reactor to react for a period of time to obtain a primary coating material. Finally, the prepared repair capsules are evenly mixed with the primary coating material. During the mixing process, additives are added. After the mixture is evenly mixed, a high-temperature self-healing coating material is obtained.

[0040] Example 3: A high-temperature self-healing coating material, including a finished coating material, wherein the finished coating material is prepared from coating material raw materials in a certain proportion and through a series of processing treatments, the coating material raw materials include epoxy resin, polyurethane, polyamide, solvent, additive, graphene, ceramic powder, and dispersant, and the epoxy resin, polyurethane, polyamide, solvent, additive, graphene, ceramic powder, and dispersant are respectively configured according to the following percentages: 80-120 parts of epoxy resin, 30-40 parts of polyurethane, 15-20 parts of polyamide, 30-50 parts of solvent, 2-5 parts of additive, 20-25 parts of graphene, 20-25 parts of ceramic powder, and 5-10 parts of dispersant.

[0041] A method for preparing a high-temperature self-repairing coating material comprises the following steps:

[0042] S1: Preparation of raw materials: prepare epoxy resin, polyurethane, polyamide, solvent, additive, graphene, ceramic powder, and dispersant required for the production of external liquid, and prepare the prepared raw materials in the proportion of 120 parts of epoxy resin, 40 parts of polyurethane, 40 parts of polyamide, 50 parts of solvent, 5 parts of additive, 25 parts of graphene, 25 parts of ceramic powder, and 10 parts of dispersant;

[0043] S2: Preparation of repair wall material: After the raw materials are prepared, the prepared polyurethane and polyamide are poured into the reactor in a certain proportion, and the polyurethane and polyamide are fully mixed. After the mixing is completed, the stirring reaction is continued for a period of time, and then the graphene is added to the mixture after the mixing reaction, and then part of the dispersant is added thereto and the stirring reaction is continued. After the stirring reaction for a period of time, the reactants are ultrasonically dispersed for a period of time. After the ultrasonic dispersion is completed, the temperature of the reactor is adjusted, and the reaction is continued. After the reaction is completed, the repair material wall material is obtained;

[0044] S3: Preparation of repair core material: After the wall material is prepared, take part of the epoxy resin and pour it into the reactor, then add part of the ceramic powder and part of the dispersant to the epoxy resin, adjust the reactor to a certain temperature, and evenly mix the epoxy resin, ceramic powder and dispersant. After the mixing is completed, keep the temperature at a certain level and continue the reaction for a period of time to obtain the core material;

[0045] S4: Preparation of repair capsules: After the wall material and the core material are prepared respectively, the obtained wall material is added to the obtained core material, and the wall material and the core material are evenly mixed in a reaction kettle, and then the mixture is adjusted to a certain temperature and reacted for a period of time and then naturally cooled. After the cooling is completed, the mixture is vacuum filtered, and then the mixture is washed and dried to obtain a repair capsule;

[0046] S5: Preparation of coating materials: After the repair capsules are prepared, the remaining epoxy resin and ceramic powder are mixed in a reactor. After uniform mixing, the solvent is added and mixed evenly. Finally, the dispersant is added and mixed evenly again. The mixture is placed in a reactor to react for a period of time to obtain a primary coating material. Finally, the prepared repair capsules are evenly mixed with the primary coating material. During the mixing process, additives are added. After the mixture is evenly mixed, a high-temperature self-healing coating material is obtained.

[0047] As a preferred implementation of this embodiment, the additives are leveling agent, defoaming agent and substrate wetting agent, the ratio of the leveling agent, defoaming agent and substrate wetting agent is 1:0.2:3, and the amount of the additives used is 0.5% to 0.1% of the weight of the coating.

[0048] As a preferred implementation manner of this embodiment, the solvent is one or more of alcohols, ethers, ketones and esters. If multiple substances among alcohols, ethers, ketones and esters are selected as solvents, the ratio of the selected substances is 1:1:1:1.

[0049] As a preferred implementation of this embodiment, when preparing the wall material of the repair material, the polyurethane, polyamide, graphene and dispersant are evenly mixed and ultrasonic dispersion is completed, and then the temperature of the reactor is adjusted to 70-80 degrees Celsius and reacted for 2-3 hours under stirring.

[0050] As a preferred implementation of this embodiment, when preparing the wall material of the repair material, the polyurethane, polyamide, graphene and dispersant are evenly mixed and then ultrasonically dispersed for 20 to 30 minutes.

[0051] As a preferred implementation of this embodiment, when preparing the core material of the repair material, after the epoxy resin, ceramic powder and dispersant are evenly mixed, the temperature of the reactor is increased to 60-70 degrees Celsius. When the temperature is increased, the temperature of the mixture is evenly increased. After the reactor is increased to the reaction temperature, the reaction is continued for 1-1.5 hours.

[0052] As a preferred implementation of this embodiment, when preparing the repair capsule, after the wall material and the core material are mixed, the pH value of the mixed material needs to be adjusted to 7-8. When washing the repair capsule, acetone is selected as the detergent and the drying temperature is 50-60 degrees Celsius.

[0053] As a preferred implementation of this embodiment, when preparing the repair capsule, after the wall material and the core material are mixed, the temperature of the reactor is increased to 65-75 degrees Celsius. After the reactor is raised to the reaction temperature, the reaction is continued for 1.5-2 hours. During the reaction process, the mixing components of the reactor are mixed and stirred simultaneously until the reaction is completed.

[0054] As a preferred implementation mode of this embodiment, when preparing the repair wall material, the rotation speed of the mixing component of the reactor is 1800-2200 revolutions per minute, when preparing the repair core material, the rotation speed of the mixing component of the reactor is 1000-1300 revolutions per minute, when preparing the repair capsule, the rotation speed of the mixing component of the reactor is 1200-1500 revolutions per minute, and when preparing the coating material, the rotation speed of the mixing component of the reactor is 2400-3000 revolutions per minute.

[0055] Working principle of the present invention:

[0056] In the present invention, repair capsules are mixed into the coating material. When cracks appear in the coating material during long-term use, the repair capsules inside the coating material rupture and flow out to fill the gaps in the coating material, thereby repairing the coating material. The graphene and ceramic powder components in the repair capsules are mixed with the epoxy resin, so that the crack filling material and the coating material are tightly combined to repair the coating. The graphene and ceramic powder components improve the thermal stability and resistance of the coating material. The repaired coating material is not easy to crack and has better moisture resistance and corrosion resistance. Compared with traditional coating materials, the gaps in the coating material can be automatically repaired under certain circumstances, which greatly improves the self-repairing ability of the coating, and the coating material is more durable. The dispersant makes the distribution of the components of the coating material more uniform.

[0057] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-temperature self-repairing coating material, including a finished coating material, characterized in that: The finished coating material is prepared from coating material raw materials in a certain proportion and after a series of processing treatments. The coating material raw materials include epoxy resin, polyurethane, polyamide, solvent, additive, graphene, ceramic powder, and dispersant. The epoxy resin, polyurethane, polyamide, solvent, additive, graphene, ceramic powder, and dispersant are respectively configured according to the following percentages: 80-120 parts of epoxy resin, 30-40 parts of polyurethane, 15-20 parts of polyamide, 30-50 parts of solvent, 2-5 parts of additive, 20-25 parts of graphene, 20-25 parts of ceramic powder, and 5-10 parts of dispersant.

2. The method for preparing a high-temperature self-repairing coating material according to claim 1 is applicable to a high-temperature self-repairing coating material in claim 1, characterized in that: The following steps are involved: S1: Preparation of raw materials: prepare epoxy resin, polyurethane, polyamide, solvent, additive, graphene, ceramic powder, and dispersant required for the production of external liquid, and prepare the prepared raw materials according to the proportion of 80-120 parts of epoxy resin, 30-40 parts of polyurethane, 30-40 parts of polyamide, 30-50 parts of solvent, 2-5 parts of additive, 20-25 parts of graphene, 20-25 parts of ceramic powder, and 5-10 parts of dispersant; S2: Preparation of repair wall material: After the raw materials are prepared, the prepared polyurethane and polyamide are poured into the reactor in a certain proportion, and the polyurethane and polyamide are fully mixed. After the mixing is completed, the stirring reaction is continued for a period of time, and then the graphene is added to the mixture after the mixing reaction, and then part of the dispersant is added thereto and the stirring reaction is continued. After the stirring reaction for a period of time, the reactants are ultrasonically dispersed for a period of time. After the ultrasonic dispersion is completed, the temperature of the reactor is adjusted, and the reaction is continued. After the reaction is completed, the repair material wall material is obtained; S3: Preparation of repair core material: After the wall material is prepared, take part of the epoxy resin and pour it into the reactor, then add part of the ceramic powder and part of the dispersant to the epoxy resin, adjust the reactor to a certain temperature, and evenly mix the epoxy resin, ceramic powder and dispersant. After the mixing is completed, keep the temperature at a certain level and continue the reaction for a period of time to obtain the core material; S4: Preparation of repair capsules: After the wall material and the core material are prepared respectively, the obtained wall material is added to the obtained core material, and the wall material and the core material are evenly mixed in a reaction kettle, and then the mixture is adjusted to a certain temperature and reacted for a period of time and then naturally cooled. After the cooling is completed, the mixture is vacuum filtered, and then the mixture is washed and dried to obtain a repair capsule; S5: Preparation of coating materials: After the repair capsules are prepared, the remaining epoxy resin and ceramic powder are mixed in a reactor. After uniform mixing, the solvent is added and uniformly mixed. Finally, the dispersant is added and uniformly mixed again. The mixture is placed in a reactor to react for a period of time to obtain a primary coating material. Finally, the prepared repair capsules are evenly mixed with the primary coating material. During the mixing process, additives are added. After the mixture is evenly mixed, a high-temperature self-healing coating material is obtained.

3. The method for preparing a high-temperature self-repairing coating material according to claim 2, characterized in that: The additives are a leveling agent, a defoaming agent and a substrate wetting agent, the ratio of the leveling agent, the defoaming agent and the substrate wetting agent is 1:0.2:3, and the amount of the additives used is 0.5% to 0.1% of the weight of the coating.

4. The method for preparing a high-temperature self-repairing coating material according to claim 2, characterized in that: The solvent is one or more of alcohols, ethers, ketones and esters. If multiple substances among alcohols, ethers, ketones and esters are selected as the solvent, the ratio of the selected substances is 1:1:1:

1.

5. The method for preparing a high-temperature self-repairing coating material according to claim 2, characterized in that: When preparing the wall material of the repair material, polyurethane, polyamide, graphene and dispersant are uniformly mixed and ultrasonic dispersion is completed, and then the temperature of the reactor is adjusted to 70 to 80 degrees Celsius and reacted for 2 to 3 hours under stirring.

6. The method for preparing a high-temperature self-repairing coating material according to claim 2, characterized in that: When preparing the wall material of the repair material, the polyurethane, polyamide, graphene and dispersant are uniformly mixed and then ultrasonically dispersed for 20 to 30 minutes.

7. The method for preparing a high temperature self-repairing coating material according to claim 2, characterized in that: When preparing the core material of the repair material, the epoxy resin, ceramic powder and dispersant are evenly mixed, and the temperature of the reactor is increased to 60-70 degrees Celsius. When the temperature is increased, the temperature of the mixture is evenly increased. After the reactor is increased to the reaction temperature, the reaction is continued for 1-1.5 hours.

8. The method for preparing a high temperature self-repairing coating material according to claim 2, characterized in that: When preparing the repair capsule, after the wall material and the core material are mixed, the pH value of the mixed material needs to be adjusted to 7-8. When washing the repair capsule, acetone is selected as the detergent and the drying temperature is 50-60 degrees Celsius.

9. The method for preparing a high-temperature self-repairing coating material according to claim 2, characterized in that: When preparing the repair capsule, after the wall material and the core material are mixed, the temperature of the reactor is increased to 65-75 degrees Celsius. After the reactor is increased to the reaction temperature, the reaction is continued for 1.5-2 hours. During the reaction, the mixing components of the reactor are mixed and stirred at the same time until the reaction is completed.

10. The method for preparing a high temperature self-repairing coating material according to claim 2, characterized in that: When preparing the repair wall material, the rotation speed of the mixing component of the reactor is 1800-2200 revolutions per minute. When preparing the repair core material, the rotation speed of the mixing component of the reactor is 1000-1300 revolutions per minute. When preparing the repair capsule, the rotation speed of the mixing component of the reactor is 1200-1500 revolutions per minute. When preparing the coating material, the rotation speed of the mixing component of the reactor is 2400-3000 revolutions per minute.

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