CN105602193B - One kind can self-healing composite insulating material and preparation method thereof - Google Patents

Abstract

The invention relates to a self-healing composite insulating material and a preparation method thereof, belonging to the technical field of making insulating materials in the electric power industry. The composite insulating material is prepared by blending a hydrogen bond-based self-healing material component and an insulating material in a solution of. The preparation process of the composite material is divided into two steps: the first step is to prepare a hydrogen bond-based self-healing material component from the fatty acid polymer mixture, aliphatic polyamine and urea; the second step is to combine the hydrogen bond self-healing The material components and the insulating material are dissolved and blended in the solution to form a homogeneous mixed system, and the solvent in the mixed solution is removed by heating and vacuumizing to obtain a composite insulating material. The composite insulating material prepared by the invention has a certain self-healing ability, which improves its reliability during use and the service life of the material.

Description

A kind of self-healing composite insulating material and preparation method thereof

technical field

The invention belongs to the technical field of making insulating materials in the electric power industry, and in particular relates to a self-healing composite insulating material and a preparation method thereof.

Background technique

With the development trend of miniaturization of power equipment, solid insulating materials show certain advantages in some applications, such as dry-type transformers, power cables and so on. During the use of solid insulating materials, one of the main reasons for insulation aging and insulation performance degradation is the generation and development of electrical dendrites in solid insulating materials. The further development of the aging behavior of electrical dendrites in insulating materials will eventually lead to the breakdown of the insulating layer, which will cause damage and failure of electrical equipment. And some electrical equipment such as cables will bring great inconvenience to maintenance after a breakdown occurs underground, a large amount of manpower and financial resources will be wasted, and will also cause a certain scale of power outage maintenance at the same time, causing huge economic losses. Therefore, based on the phenomenon that organisms can self-heal wounds, it is an urgent research problem to propose a solid self-healing insulating material from the perspective of bionics.

Reversible bond-type self-healing materials introduce chemical bonds or intermolecular forces such as ionic bond cross-linking combinations, multiple hydrogen bonds, and active urea bonds into the compound. When a microcrack defect occurs, the broken cross-linked network is reconnected at the corresponding active group of the reversible bond through the reversible bond inside the material, so as to realize the spontaneous healing of the material. Hydrogen bond-based self-healing materials are one of the materials that have reversible self-healing properties by introducing multiple hydrogen bonds. To sum up, the insulation aging problem in solid insulation materials seriously threatens the insulation safety of power equipment in medium and small power systems, and the existing solid insulation materials do not have the ability to self-heal after defects occur. Therefore, a kind of insulating composite material with certain self-healing ability has been developed, which can improve the insulation reliability in the power system, save the maintenance cost of the faulty equipment, reduce the material consumption of the scrapped equipment due to the damage of the insulating layer, and improve the application of insulating materials. economy is of great significance. According to research reports, self-healing materials based on hydrogen bonds have been applied to conductive materials, but self-healing research on insulating materials is still vacant.

Contents of the invention

The purpose of the present invention is to solve the problem that the life of the existing insulating material is shortened due to the phenomenon of electrical aging during use and needs to be replaced repeatedly, and proposes a self-healing composite insulating material and its preparation method, so that the obtained composite The insulating material has a certain self-healing ability, which improves its reliability during use and the service life of the material.

The self-healing composite insulating material proposed by the present invention is prepared by blending the hydrogen bond-based self-healing material component and the insulating material through a solution; the hydrogen-bond-based self-healing material component is a mixture of fatty acid polymers It is prepared from three raw materials, aliphatic polyamine and urea, wherein the mass ratio of fatty acid polymer mixture to aliphatic polyamine is 1.1-4.8:1, and the intermediate formed by the reaction of fatty acid polymer mixture and aliphatic polyamine The mass ratio of the insulating material to the urea is 12.6-24.6:1, and the mass ratio of the insulating material to the hydrogen bond-based self-healing material component is 0.25-9:1 (so that the insulating material accounts for 20-90% of the total mass of the composite insulating material).

The preparation method of the proposed self-healing composite insulating material of the present invention is realized through the following steps:

(1) The first step of preparation process of self-healing composite insulating material:

(1-1) Weigh the fatty acid polymer mixture and aliphatic polyamine with a mass ratio of 1.1-4.8:1, heat it at 150-200°C for 12-36 hours in an oil bath, and pass nitrogen gas during the reaction Protection, while continuous mechanical stirring, to obtain intermediate products;

(1-2) After mixing the intermediate product obtained in step (1-1) with urea at a mass ratio of 12.6-24.6:1, use an oil bath to heat at a temperature of 100-140°C for 6-10 hours, during the reaction Protected with nitrogen gas and continuously mechanically stirred to obtain a self-healing material component based on hydrogen bonds;

(2) The second step of the preparation process of the self-healing composite insulating material:

(2-1) Heat the hydrogen bond-based self-healing material component prepared in step (1) in a blast drying oven at 60-80°C for 20-40min to fully liquefy it and obtain a compound with good fluidity Hydrogen bond-based self-healing material components;

(2-2) Dissolving the fully liquefied self-healing material component based on hydrogen bonds in a solvent (the mass ratio of the solvent to the self-healing material components based on hydrogen bonds is 1-2:1) to form a self-healing material solution, and After sealing the container containing the solution, heat it at 60-80°C for 10-30min;

(2-3) Add the insulating material to the self-healing material solution obtained in step (2-2) for mixing, preheat at 60-80°C for 1-3min, and mechanically stir for 3-5min to obtain a mixture solution; epoxy resin The mass ratio of the hydrogen bond-based self-healing material component obtained in step (1-2) is 0.25-9:1 (making the epoxy resin account for 20-90% of the total mass of the composite insulating material);

(2-4) Place the mixture solution obtained in step (2-3) in a vacuum drying oven to evacuate at 50-70° C., and let it stand in a vacuum environment for 20-40 minutes to completely discharge the solvent in the mixture solution;

(2-5) Heating the solvent-removed mixture at 60-100° C. for 12-24 hours to solidify it to obtain a finished self-healing composite insulating material.

The invention adopts a hybrid system of self-healing material components and insulating materials based on hydrogen bonds, uses a solution blending method, heats and removes the solvent in a vacuum environment, and solidifies and shapes the self-healing insulating composite material. After mechanical damage, the self-healing insulating composite material of the present invention can recover 70% of its original tensile strength after self-healing through mechanical testing, and its volume resistivity can recover to the original value through electrical testing. The volume resistivity differs by no more than 3%.

The self-healing insulating composite material system of the present invention has the ability to heal the electrical tree branches generated in the electrical aging process. After the material develops the electrical tree branches, the tiny branches of the electrical tree branches can be self-healed through the treatment process, and after self-healing The drop of the tree voltage does not exceed 10% of the initial tree voltage, which can effectively heal the electric tree branches generated by the slow electrical aging of the insulating material during use, thereby hindering the aging breakdown process of the insulating layer and prolonging the service life of the insulating material. Reducing the frequency of insulating material replacement improves the long-term stability and reliability of the insulating layer, which is important for reducing the material consumption of scrapped equipment due to insulation layer damage, saving maintenance expenses for faulty equipment, and improving the economy of insulating material applications. significance.

Detailed ways

A self-healing composite insulating material proposed by the present invention and its preparation method are described in detail in conjunction with examples as follows:

A self-healing composite insulating material proposed by the present invention is characterized in that the composite insulating material is prepared by blending a hydrogen bond-based self-healing material component and an insulating material in a solution; the hydrogen bond-based The self-healing material component is made of fatty acid polymer mixture, aliphatic polyamine and urea, wherein the mass ratio of fatty acid polymer mixture to aliphatic polyamine is 1.1-4.8:1, fatty acid polymer The mass ratio of the intermediate to urea produced by the reaction of the solid mixture with the aliphatic polyamine is 12.6-24.6:1, and the mass ratio of the insulating material to the self-healing material component based on hydrogen bonds is 0.25-9:1 (making the insulating material account for 20-90% of the total mass of the composite insulating material).

The mass fractions of fatty acid monomers, fatty acid dimers and fatty acid trimers in the selected fatty acid multimer mixture are (0.5-18%):(50-98%):(1.5-32%).

The selected aliphatic polyamine is any one of aliphatic hydrocarbons having at least two amino groups among ethylenediamine, propylenediamine, diethylenetriamine and triethylenetetramine.

The selected solvent is any one of halogenated hydrocarbons such as dichloromethane and chloroform.

The insulating material selected is any one of bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin and novolac type epoxy resin.

The preparation method of the above-mentioned self-healing composite insulating material of the present invention is realized through the following steps:

(1) The first step of preparation process of self-healing composite insulating material:

(1-1) Weigh the fatty acid polymer mixture and aliphatic polyamine with a mass ratio of 1.1-4.8:1, heat it at 150-200°C for 12-36 hours in an oil bath, and pass nitrogen gas during the reaction Protection, while continuous mechanical stirring, to obtain intermediate products;

(1-2) After mixing the intermediate product obtained in step (1-1) with urea at a mass ratio of 12.6-24.6:1, use an oil bath to heat at a temperature of 100-140°C for 6-10 hours, during the reaction Protected with nitrogen gas and continuously mechanically stirred to obtain a self-healing material component based on hydrogen bonds;

(2) The second step of the preparation process of the self-healing composite insulating material:

(2-1) Heat the hydrogen bond-based self-healing material component prepared in step (1) in a blast drying oven at 60-80°C for 20-40min to fully liquefy it and obtain a compound with good fluidity Hydrogen bond-based self-healing material components;

(2-2) Dissolving the fully liquefied self-healing material component based on hydrogen bonds in a solvent (the mass ratio of the solvent to the self-healing material components based on hydrogen bonds is 1-2:1) to form a self-healing material solution, and After sealing the container containing the solution, heat it at 60-80°C for 10-30min;

(2-3) Add the insulating material to the self-healing material solution obtained in step (2-2) for mixing, preheat at 60-80°C for 1-3min, and mechanically stir for 3-5min to obtain a mixture solution; epoxy resin The mass ratio of the hydrogen bond-based self-healing material component obtained in step (1-2) is 0.25-9:1 (making the epoxy resin account for 20-90% of the total mass of the composite insulating material);

(2-4) Place the mixture solution obtained in step (2-3) in a vacuum drying oven to evacuate at 50-70° C., and let it stand in a vacuum environment for 20-40 minutes to completely discharge the solvent in the mixture solution;

(2-5) Heating the solvent-removed mixture at 60-100° C. for 12-24 hours to solidify it to obtain a finished self-healing composite insulating material.

The technical solutions of the present invention are not limited to the specific embodiments listed below.

Specific implementation plan one:

The self-healing composite insulating material prepared in this embodiment is prepared by solution blending the self-healing material component based on hydrogen bonds and the insulating material bisphenol A epoxy resin. The self-healing material component based on hydrogen bond is composed of fatty acid polymer mixture (the mass fraction of fatty acid monomer, fatty acid dimer and fatty acid trimer is 5%:82%:13%), diethylene triamine and The three kinds of raw materials of urea make, wherein the mass ratio of fatty acid multimer mixture and diethylene triamine is 2.4:1, the mass ratio of the intermediate that fatty acid multimer mixture and diethylene triamine reacts and urea is 14.6:1, the mass ratio of bisphenol A epoxy resin to hydrogen bond-based self-healing material components is 1.6:1.

A method for preparing a self-healing composite insulating material, which is achieved through the following steps:

(1) The first step of preparation process of self-healing composite insulating material:

(1-1) Weigh 72g of the fatty acid polymer mixture and 30g of diethylenetriamine (the mass ratio of the fatty acid polymer mixture to diethylenetriamine is 2.4:1), and heat it at a temperature of 200°C in an oil bath For 36 hours, during the reaction, nitrogen gas was used to protect, while continuous mechanical stirring was carried out to obtain the intermediate product;

(1-2) After mixing the intermediate product obtained in step (1-1) with 7 g of urea (the mass ratio of intermediate product to urea is 14.6:1), heat it at a temperature of 140° C. for 10 hours in an oil bath, and react During this period, nitrogen is used for protection, and at the same time, continuous mechanical stirring is used to obtain a self-healing material component based on hydrogen bonds;

(2) The second step of the preparation process of the self-healing composite insulating material:

(2-1) Heat the hydrogen-bond-based self-healing material component prepared in step (1) at 80°C for 40 minutes in a blast drying oven to fully liquefy it, and obtain a hydrogen-bond-based self-healing material component with good fluidity self-healing material components;

(2-2) Dissolve the fully liquefied hydrogen bond-based self-healing material components in 218 g of chloroform (the mass ratio of chloroform to hydrogen bond-based self-healing material components is 2:1) to form a self-healing material solution, and after sealing the container containing the solution, heat at 80°C for 30min;

(2-3) 174g bisphenol A type epoxy resin is added to the solution in (2-2) and mixed and preheated with 80 ℃ for 3min, and mechanically stirred for 5min to obtain a mixture solution; bisphenol A type epoxy resin and The mass ratio of the self-healing material components based on hydrogen bonds obtained in step (1-2) is 1.6:1 (making the bisphenol A type epoxy resin account for 60% of the total mass of the composite insulating material);

(2-4) Place the mixture solution in step (2-3) in a vacuum drying oven to evacuate at 70° C., and let it stand in a vacuum environment for 40 minutes to completely discharge the solvent in the mixture solution;

(2-5) The solvent-removed mixture was heated at 100° C. for 12 hours to be cured to obtain a finished self-healing composite insulating material.

Specific implementation plan two:

The self-healing composite insulating material prepared in this embodiment is prepared by solution blending the self-healing material component based on hydrogen bonds and the insulating material bisphenol F epoxy resin. The self-healing material component based on hydrogen bond is composed of fatty acid polymer mixture (the mass fraction of fatty acid monomer, fatty acid dimer and fatty acid trimer is 0.5%:98%:1.5%), triethylenetetramine and The three kinds of raw materials of urea make, and wherein the mass ratio of fatty acid multimer mixture and triethylenetetramine is 3.2:1, the mass ratio of the intermediate that fatty acid multimer mixture and triethylenetetramine reaction generates and urea is 12.6:1, the mass ratio of bisphenol F epoxy resin to hydrogen bond-based self-healing material components is 9:1.

A method for preparing a self-healing composite insulating material, which is achieved through the following steps:

(1) The first step of preparation process of self-healing composite insulating material:

(1-1) Weigh 80g of fatty acid polymer mixture and 25g of triethylenetetramine (the mass ratio of fatty acid polymer mixture to triethylenetetramine is 3.2:1), and heat it at a temperature of 190°C in an oil bath For 30 hours, during the reaction, nitrogen was used for protection, while continuous mechanical stirring was carried out to obtain an intermediate product;

(1-2) After mixing the intermediate product obtained in step (1-1) with 8.3 g of urea (the mass ratio of intermediate product to urea is 12.6:1), heat it at a temperature of 135° C. for 8.5 hours in an oil bath, During the reaction period, nitrogen gas is used for protection, and continuous mechanical stirring is applied at the same time to obtain a self-healing material component based on hydrogen bonds;

(2) The second step of the preparation process of the self-healing composite insulating material:

(2-1) Heat the hydrogen-bond-based self-healing material component prepared in step (1) at 80°C for 30 minutes in a blast drying oven to fully liquefy it, and obtain a hydrogen-bond-based self-healing material component with good fluidity self-healing material components;

(2-2) Dissolve the fully liquefied hydrogen bond-based self-healing material components in 204 g of chloroform (the mass ratio of chloroform to hydrogen bond-based self-healing material components is 1.8:1) to form a self-healing material solution, and after sealing the container containing the solution, heat at 80°C for 25min;

(2-3) 1020g of bisphenol F type epoxy resin is added to the solution in (2-2) and mixed and preheated at 80°C for 2min, mechanically stirred for 4min to obtain a mixture solution; bisphenol F type epoxy resin and The mass ratio of the self-healing material components based on hydrogen bonds obtained in step (1-2) is 9:1 (making the bisphenol F type epoxy resin account for 90% of the total mass of the composite insulating material);

(2-4) Place the mixture solution in step (2-3) in a vacuum drying oven to evacuate at 65° C., and let it stand in a vacuum environment for 30 minutes to completely discharge the solvent in the mixture solution;

(2-5) The solvent-removed mixture was heated at 90° C. for 18 hours to be cured to obtain a finished self-healing composite insulating material.

Specific implementation plan three:

The self-healing composite insulating material prepared in this embodiment is prepared by solution blending the self-healing material component based on hydrogen bonds and the insulating material bisphenol S-type epoxy resin. The self-healing material component based on hydrogen bond is composed of fatty acid polymer mixture (the mass fraction of fatty acid monomer, fatty acid dimer and fatty acid trimer is 12%:68%:20%), ethylenediamine and urea three It is prepared from a kind of raw material, wherein the mass ratio of fatty acid multimer mixture and ethylenediamine is 4.8:1, the mass ratio of fatty acid multimer mixture and ethylenediamine reaction intermediate and urea is 21.5:1, bisphenol The mass ratio of S-type epoxy resin to the hydrogen bond-based self-healing material component is 0.8:1.

A method for preparing a self-healing composite insulating material, which is achieved through the following steps:

(1) The first step of preparation process of self-healing composite insulating material:

(1-1) Weigh 86g of the fatty acid polymer mixture and 18g of ethylenediamine (the mass ratio of the fatty acid polymer mixture to ethylenediamine is 4.8:1), heat at 160°C for 20 hours in an oil bath, and react During this period, nitrogen is used for protection, and continuous mechanical stirring is carried out simultaneously to obtain intermediate products;

(1-2) After mixing the intermediate product obtained in step (1-1) with 4.8 g of urea (the mass ratio of intermediate product to urea is 21.5:1), heat it at 120° C. for 7 hours in an oil bath, During the reaction period, nitrogen gas is used for protection, and continuous mechanical stirring is applied at the same time to obtain a self-healing material component based on hydrogen bonds;

(2) The second step of the preparation process of the self-healing composite insulating material:

(2-1) Heat the hydrogen-bond-based self-healing material component prepared in step (1) at 70°C for 25 minutes in a blast drying oven to fully liquefy it, and obtain a hydrogen-bond-based self-healing material component with good fluidity self-healing material components;

(2-2) Dissolve the fully liquefied hydrogen bond-based self-healing material components in 131 g of dichloromethane (the mass ratio of dichloromethane to hydrogen bond-based self-healing material components is 1.2:1) to form a self-healing material solution, and after sealing the container containing the solution, heat at 70°C for 20min;

(2-3) 87g of bisphenol S-type epoxy resin is added to the solution in (2-2) and mixed and preheated at 70°C for 2min, mechanically stirred for 3min to obtain a mixture solution; bisphenol S-type epoxy resin and The mass ratio of the self-healing material components based on hydrogen bonds obtained in step (1-2) is 0.8:1 (making the bisphenol S type epoxy resin account for 44% of the total mass of the composite insulating material);

(2-4) Place the mixture solution in step (2-3) in a vacuum drying oven to evacuate at 55° C., and let it stand in a vacuum environment for 25 minutes to completely discharge the solvent in the mixture solution;

(2-5) The solvent-removed mixture was heated at 75° C. for 20 h to be cured to obtain a finished self-healing composite insulating material.

Specific implementation plan four:

The self-healing composite insulating material prepared in this embodiment is prepared by solution blending the self-healing material component based on hydrogen bonds and the insulating material novolac epoxy resin. The hydrogen bond-based self-healing material is composed of fatty acid polymer mixture (the mass fraction of fatty acid monomer, fatty acid dimer and fatty acid trimer is 18%:50%:32%), propylene diamine and urea three A kind of raw material is prepared, wherein the mass ratio of fatty acid multimer mixture and propylene diamine is 1.1:1, the mass ratio of the intermediate and urea that fatty acid multimer mixture and propylene diamine reacts is 24.6:1, novolac The mass ratio of type epoxy resin to hydrogen bond-based self-healing material components is 0.25:1.

A method for preparing a self-healing composite insulating material, which is achieved through the following steps:

(1) The first step of preparation process of self-healing composite insulating material:

(1-1) Weigh 55g of fatty acid polymer mixture and 50g of propylenediamine (the mass ratio of fatty acid polymer mixture to propylenediamine is 1.1:1), heat at 150°C for 12 hours in an oil bath, and react During this period, nitrogen is used for protection, and continuous mechanical stirring is carried out simultaneously to obtain intermediate products;

(1-2) After mixing the intermediate product obtained in step (1-1) with 4.3 g of urea (the mass ratio of intermediate product to urea is 24.6:1), heat it at 100° C. for 6 hours in an oil bath, During the reaction period, nitrogen gas is used for protection, and continuous mechanical stirring is applied at the same time to obtain a self-healing material component based on hydrogen bonds;

(2) The second step of the preparation process of the self-healing composite insulating material:

(2-1) Heat the hydrogen-bond-based self-healing material component prepared in step (1) at 60°C for 20 minutes in a blast drying oven to fully liquefy it, and obtain a hydrogen-bond-based self-healing material component with good fluidity. self-healing material components;

(2-2) Dissolve the fully liquefied hydrogen bond-based self-healing material components in 109 g of dichloromethane (the mass ratio of dichloromethane to hydrogen bond-based self-healing material components is 1:1) to form a self-healing material solution, and after sealing the container containing the solution, heat at 60°C for 10 minutes;

(2-3) 27g novolak type epoxy resin is added to the solution in (2-2) and mixed and preheated 1min with 60 ℃, mechanically stirred 3min, obtain mixture solution; Novolac type epoxy resin and step ( 1-2) The mass ratio of the obtained self-healing material components based on hydrogen bonds is 0.25:1 (making the novolak type epoxy resin account for 20% of the total mass of the composite insulating material);

(2-4) Place the mixture solution in step (2-3) in a vacuum drying oven to evacuate at 50° C., and let it stand in a vacuum environment for 20 minutes to completely discharge the solvent in the mixture solution;

(2-5) The solvent-removed mixture was heated at 60° C. for 24 hours to be cured to obtain a finished self-healing composite insulating material.

Claims (5)

1. one kind can self-healing composite insulating material, it is characterised in that the composite insulating material is by the self-healing material based on hydrogen bond Component and insulating materials are made from by way of solution blending；The self-healing material component based on hydrogen bond is by aliphatic acid poly Made from three kinds of body mixture, aliphatic polyamine and urea raw materials, the wherein matter of aliphatic acid polymer mixture and aliphatic polyamine It is 1.1-4.8 to measure ratio:1, the intermediate of aliphatic acid polymer mixture and aliphatic polyamine reaction generation and the mass ratio of urea are 12.6-24.6:1, insulating materials and the mass ratio of the self-healing material component based on hydrogen bond are 0.25-9:1, described insulating materials Among bisphenol A type epoxy resin, bisphenol f type epoxy resin, bisphenol-s epoxy resin and novolac type epoxy resin It is any.

2. as claimed in claim 1 can self-healing composite insulating material, it is characterised in that selected aliphatic acid polymer mixing Fatty acid mono, fatty acid dimer, the mass fraction of aliphatic acid tripolymer are (0.5-18%) in thing:(50-98%): (1.5-32%).

3. as claimed in claim 1 can self-healing composite insulating material, it is characterised in that selected aliphatic polyamine is second two Any of aliphatic hydrocarbon with least two amino in amine, propane diamine, diethyl triamine, trientine.

4. as claimed in claim 1 can self-healing composite insulating material, it is characterised in that selected solvent be dichloromethane, Any of chloroform halogenated hydrocarbons.

5. it is a kind of as claimed in claim 1 can self-healing composite insulating material preparation method, it is characterised in that the preparation method Through the following steps that realize：

(1) can self-healing composite insulating material first step preparation process：

It is 1.1-4.8 that (1-1), which weighs mass ratio,:1 aliphatic acid polymer mixture and aliphatic polyamine, use oil bath pan with 150-200 DEG C of temperature heating 12-36 hours, pass to nitrogen during reaction and protected, while be subject to lasting mechanical agitation, Obtain midbody product；

The midbody product that (1-2) obtains step (1-1) is with urea with 12.6-24.6:After 1 mass ratio mixing, using oil bath Pot heats 6-10 hours with 100-140 DEG C of temperature, passes to nitrogen during reaction and is protected, while is subject to lasting machinery and stirs Mix, obtain the self-healing material component based on hydrogen bond；

(2) can self-healing composite insulating material second step preparation process：

The self-healing material component based on hydrogen bond that (2-1) prepares step (1) is in air dry oven with 60-80 DEG C of heating 20-40min, it is fully liquefied, obtain the self-healing material component based on hydrogen bond with preferable mobility；

The self-healing material component based on hydrogen bond after abundant liquefaction is dissolved in solvent and forms self-healing material solution by (2-2), solvent with Self-healing material constituent mass ratio based on hydrogen bond is 1-2:1, and by after the container closure equipped with solution, 10- is heated with 60-80 DEG C 30min；

Insulating materials epoxy resin is added to the self-healing material solution obtained in step (2-2) and mixed and with 60- by (2-3) 80 DEG C of preheating 1-3min, mechanical agitation 3-5min, obtain mixture solution；Epoxy resin and step (1-2) obtain based on hydrogen The mass ratio of the self-healing material component of key is 0.25-9:1 so that epoxy resin accounts for the 20-90% of composite insulating material gross mass；

The mixture solution that step (2-3) obtains is placed in vacuum drying chamber at 50-70 DEG C and vacuumized by (2-4), in vacuum 20-40min is stood under environment causes the solvent in the mixture solution to be completely exhausted out；

The mixture for removing solvent is heated 12-24h and makes its solidification by (2-5) at 60-100 DEG C, obtain finished product can self-healing it is compound Insulating materials.