Protective coating with heat insulation function and preparation method thereof

Abstract

The present application relates to a kind of protective coating with heat insulation function and preparation method thereof, belong to protective coating technical field, including the following raw materials: modified resin composite material, vinyl silicone oil, phenyl silicone oil, flame retardant, conical filler, crosslinking agent, catalyst and diluent;In the technical scheme of the present application, by aromatic compound and silanization reinforcing material are combined, to obtain composite material;Composite material is combined with resin compound, then curing agent is added, to obtain modified resin composite material;Modified resin composite material, vinyl silicone oil, phenyl silicone oil, flame retardant, crosslinking agent, diluent, conical filler, catalyst are mixed, finally obtain protective coating with heat insulation function;By the better combination between aromatic compound, silanization reinforcing material and resin compound, effectively improve the heat resistance, ablation resistance, thermal insulation performance and mechanical properties of protective coating, overall improve the comprehensive performance of protective coating.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of protective coatings, and particularly relates to a protective coating with heat insulation function and a preparation method thereof. BACKGROUND

[0002] With the rapid development of modern high-end equipment, the demand for high-performance strike weapons and other equipment is increasing in various countries. These equipment needs to have higher precision, longer range and stronger strike capability. During high-speed flight, the conditions such as aerodynamic heating, scouring environment and high-speed airflow impact faced by the outer surface of the equipment are more severe. Therefore, in order to avoid thermal structural damage to the equipment body material, higher requirements are put forward for the thermal protection material of the equipment surface. The traditional thermal protection material is often difficult to meet the multiple requirements of ablation resistance, heat insulation, lightweight, high shear resistance and the like. Therefore, it is necessary to prepare a protective coating with good comprehensive performance.

[0003] In the prior art, the traditional protective coating usually takes phenolic resin, epoxy resin and the like as the matrix resin, and realizes the heat insulation performance of the coating by adding ablation-resistant fillers (such as fumed silica, quartz powder and the like) or heat-insulating fillers (such as hollow glass microbeads, silica aerogel and the like). These fillers have poor dispersibility in the resin and are prone to agglomeration, resulting in a decrease in the mechanical properties of the product. In addition, the heat resistance of the resin used is limited, the strength decreases after ablation, and the comprehensive performance decreases. Therefore, it is necessary to further improve the heat resistance, ablation resistance, heat insulation performance and mechanical properties of the product. SUMMARY

[0004] The present application aims to provide a protective coating with heat insulation function and a preparation method thereof. A composite material is obtained by combining an aromatic compound with a silanized reinforcing material. The aromatic compound is composed of N-(4-hydroxyphenyl)-maleamic acid and 3-hydroxyphenylboronic acid, which have a synergistic effect and can improve the heat resistance, thermal stability and mechanical properties of the protective coating. The silanized reinforcing material is prepared by grafting a silane coupling agent to a reinforcing material. The reinforcing material is obtained by combining a heat-insulating filler with an aminophenyl POSS, which can effectively improve the heat insulation performance, ablation resistance and mechanical properties of the protective coating. The modified resin composite material is obtained by combining the composite material with a resin compound and adding a curing agent. The resin compound is composed of bisphenol A type phenolic epoxy resin and epoxy-modified silicone resin, which further improves the ablation resistance, heat insulation performance, thermal stability and mechanical properties of the protective coating. The protective coating with heat insulation function is finally obtained by uniformly mixing the modified resin composite material, vinyl silicone oil, phenyl silicone oil, flame retardant, crosslinking agent, diluent, conical filler and catalyst. The comprehensive performance of the protective coating is improved as a whole.

[0005] The technical problem solved by the present application is that in the prior art, the traditional protective coating usually takes phenolic resin, epoxy resin, etc. as the base resin, and realizes the heat insulation performance of the coating by adding ablation-resistant fillers (such as fumed silica, quartz powder, etc.) or heat-insulating fillers (such as hollow glass microbeads, silica aerogel, etc.). These fillers have poor dispersibility in the resin and are prone to agglomeration, resulting in a decrease in the mechanical properties of the product. In addition, the heat resistance of the resin used is limited, the strength decreases after ablation, and the comprehensive performance decreases. Therefore, it is necessary to further improve the heat resistance, ablation resistance, heat insulation performance and mechanical properties of the product.

[0006] The object of the present application can be achieved by the following technical solutions:

[0007] A protective coating with heat insulation function comprises the following raw materials by weight: 50-70 parts of modified resin composite material, 30-40 parts of vinyl silicone oil, 20-30 parts of phenyl silicone oil, 10-20 parts of flame retardant, 5-10 parts of conical filler, 2-5 parts of crosslinking agent, 0.1-0.3 parts of catalyst and 150-250 parts of diluent.

[0008] The preparation method of the modified resin composite material comprises the following steps:

[0009] S1: combine the silanized reinforcing material with the aromatic compound to obtain a composite material;

[0010] S2: combine the composite material with the resin compound, and then add a curing agent to obtain a modified resin composite material.

[0011] Further, step S1 is specifically:

[0012] Mix the silanized reinforcing material and the aromatic compound uniformly, then add an initiator and toluene, stir under nitrogen atmosphere for 20-30 min, then react at 80-90℃ for 22-24h, cool to room temperature, filter, wash with toluene, and finally vacuum dry at 60-70℃ to obtain the composite material.

[0013] In the above reaction process, the silanized reinforcing material has carbon-carbon double bonds, and the aromatic compound also has carbon-carbon double bonds. The carbon-carbon double bonds in the silanized reinforcing material can undergo a free radical polymerization reaction with the carbon-carbon double bonds in the aromatic compound, combining the silanized reinforcing material with the aromatic compound together, and finally obtaining the composite material.

[0014] Further, the mass ratio of the silanized reinforcing material, the aromatic compound, the initiator, toluene is 0.9-1.1:1.8-2.2:0.03-0.05:45-55.

[0015] Further, the initiator is azobisisobutyronitrile.

[0016] Further, the aromatic compound is composed of N-(4-hydroxyphenyl)-maleamic acid and 3-hydroxyphenylboronic acid in a mass ratio of 0.9-1:0.6-0.7.

[0017] Further, the preparation method of the N-(4-hydroxyphenyl)-maleamic acid comprises the following steps:

[0018] Maleic anhydride is added into acetone and mixed uniformly to obtain solution A, p-aminophenol is added into acetone and mixed uniformly to obtain solution B, solution B is added into solution A, then reacted in an ice water bath, after the reaction is completed, filtered, washed with acetone, and finally vacuum dried to obtain N-(4-hydroxyphenyl)-maleamic acid.

[0019] In the above reaction process, the maleic anhydride has anhydride groups, and the p-aminophenol has amino groups, the anhydride groups in the maleic anhydride can combine with the amino groups in the p-aminophenol, thereby combining the maleic anhydride and the p-aminophenol together to obtain N-(4-hydroxyphenyl)-maleamic acid.

[0020] Further, the preparation method of the silanized reinforcing material comprises the following steps:

[0021] The reinforcing material is added into ethanol and ultrasonically treated for 30-40 min to obtain a dispersion liquid, a silane coupling agent is added into deionized water, then acetic acid is added and stirred until the pH value of the solution is 4-5 to obtain a silane solution, the silane solution is added into the dispersion liquid, then reacted at 55-65℃ for 11-13 h, after the reaction is completed, washed with ethanol, and finally dried at 60-70℃ to obtain the silanized reinforcing material.

[0022] In the above reaction process, the surface of the reinforcing material has hydroxyl groups, and the silane coupling agent generates silanol groups after hydrolysis, the silanol groups on the silane coupling agent can combine with the hydroxyl groups on the reinforcing material, thereby grafting the silane coupling agent to the surface of the reinforcing material, and finally obtaining the silanized reinforcing material.

[0023] Further, the mass ratio of the silane coupling agent and the deionized water is 0.9-1.1:10-15.

[0024] Further, the silane coupling agent is γ-methacryloyloxypropyltrimethoxysilane.

[0025] Further, the mass ratio of the reinforcing material and the ethanol is 0.8-1.2:50-60.

[0026] Further, the preparation method of the reinforcing material comprises the following steps:

[0027] The thermal insulation filler is added into tetrahydrofuran and ultrasonically treated for 25-35 min, then amine phenyl POSS, N,N'-dicyclohexyl carbodiimide and 4-dimethylamino pyridine are added and stirred for 15-25 min, then heated to 55-65 DEG C and stirred under reflux for 22-24 h under nitrogen atmosphere, after the reaction is completed, centrifuged for 10-15 min, washed with tetrahydrofuran, and freeze-dried to obtain the reinforced material.

[0028] In the above reaction process, the carboxyl groups and epoxy groups on the graphene oxide in the thermal insulation filler, and the amino groups on the amine phenyl POSS, the carboxyl and epoxy groups in the thermal insulation filler can react and combine with the amino groups on the amine phenyl POSS, so as to combine the amine phenyl POSS and the thermal insulation filler together, and finally obtain the reinforced material.

[0029] Further, the mass ratio of the thermal insulation filler, tetrahydrofuran, amine phenyl POSS, N,N'-dicyclohexyl carbodiimide, 4-dimethylamino pyridine is 0.1-0.3:45-55:0.9-1.1:0.8-0.9:0.4-0.5.

[0030] Further, the thermal insulation filler is composed of graphene oxide and kaolin in a mass ratio of 0.7-0.8:0.4-0.5.

[0031] Further, the temperature of the freeze-drying is -30 to -20 DEG C.

[0032] Further, step S2 is specifically:

[0033] The composite material in step S1 is added into dimethyl sulfoxide and ultrasonically dispersed for 1.5-2.5 h, then a resin compound is added, mixed uniformly, then sodium hydroxide aqueous solution is added, then heated to 65-75 DEG C and reacted for 4.5-5.5 h, after the reaction is completed, cooled to room temperature, washed with ethanol and deionized water, centrifuged for 10-20 min, then a curing agent is added and placed at room temperature, and finally the modified resin composite material is obtained.

[0034] In the above reaction process, the composite material has carboxyl groups and phenolic hydroxyl groups on the aromatic compounds, and the resin compound has epoxy groups, the carboxyl and phenolic hydroxyl groups in the composite material can combine with the epoxy groups in the resin compound through ring-opening reaction, so as to combine the composite material and the resin compound together, and finally obtain the modified resin composite material.

[0035] Further, the mass ratio of the composite material, dimethyl sulfoxide, and resin compound is 0.1-0.3:90-110:4.9-5.1.

[0036] Further, the resin compound is composed of bisphenol A type phenolic epoxy resin and epoxy modified silicone resin in a mass ratio of 1-1.2:0.3-0.4.

[0037] Further, the curing agent is isophorone diamine.

[0038] A preparation method of a protective coating with heat insulation function, comprising the following steps:

[0039] The mass of raw materials is weighed, the modified resin composite material, vinyl silicone oil, phenyl silicone oil, flame retardant, crosslinking agent and diluent are mixed, and then stirred for 20-30 min to obtain component A, the conical filler, catalyst and diluent are mixed and stirred for 10-15 min to obtain component B, component A and component B are mixed uniformly, and finally the protective coating with heat insulation function is obtained.

[0040] Further, the flame retardant is at least one of aluminum hydroxide, platinum hydroxide, magnesium hydroxide, magnesium oxide and zinc borate.

[0041] Further, the conical filler is at least one of chopped glass fiber, chopped quartz fiber, mullite fiber and chopped high silica fiber.

[0042] Further, the crosslinking agent is at least one of methyl hydrogen-containing silicone oil, side hydrogen-containing silicone oil, end hydrogen-containing silicone oil and end-side hydrogen-containing silicone oil.

[0043] Further, the catalyst is platinum gold catalyst.

[0044] Further, the platinum gold catalyst is chloroplatinic acid.

[0045] Further, the diluent is ethyl acetate or 120# solvent oil.

[0046] The beneficial effects of the present application are:

[0047] (1) In the technical scheme of the present application, the aromatic compound is combined with the silanized reinforcing material to obtain a composite material; the aromatic compound is composed of N-(4-hydroxyphenyl)-maleamic acid and 3-hydroxyphenylboronic acid, N-(4-hydroxyphenyl)-maleamic acid not only has good bonding force with the silanized reinforcing material, but also can provide reaction sites for subsequent reactions, and can better improve the heat resistance, thermal stability and mechanical properties of the protective coating, and has antioxidant properties and is not easy to oxidize and degrade under high temperature conditions, prolonging the service life of the coating in a high temperature environment, and the boron element in 3-hydroxyphenylboronic acid can further improve the heat resistance, thermal stability and mechanical properties of the protective coating, mixing N-(4-hydroxyphenyl)-maleamic acid and 3-hydroxyphenylboronic acid has a synergistic effect, which can better improve the overall performance of the protective coating; the silanized reinforcing material is prepared by grafting the reinforcing material with a silane coupling agent; wherein the reinforcing material is obtained by combining a heat-insulating filler with an aminophenyl POSS, the combination between the heat-insulating filler and the aminophenyl POSS is good, which can effectively improve the heat insulation performance, ablation resistance and mechanical properties of the protective coating, and the reinforcing material has good dispersibility and is not easy to agglomerate, which enhances the compatibility between the reinforcing material and the resin compound, and further improves the overall performance of the protective coating.

[0048] (2) In the technical scheme of the present application, the composite material is combined with a resin compound, and a curing agent is added to obtain a modified resin composite material; the resin compound is composed of bisphenol A type phenolic epoxy resin and epoxy modified silicone resin, both of which have good heat resistance and can better improve the heat resistance of the protective coating, and have a synergistic effect, so that when they are combined with the composite material, not only the bonding force between the resin compound and the composite material is increased, the compatibility is improved, but also the ablation resistance, heat insulation performance, thermal stability and mechanical properties of the protective coating are further enhanced; the modified resin composite material, vinyl silicone oil, phenyl silicone oil, flame retardant, crosslinking agent, diluent, conical filler and catalyst are uniformly mixed to obtain a protective coating with heat insulation function, and the overall performance of the protective coating is improved.

[0049] (3) In the technical scheme of the present application, the aromatic compound is combined with the silanized reinforcing material, and then combined with the resin compound, and a curing agent is added to obtain a modified resin composite material; the modified resin composite material, vinyl silicone oil, phenyl silicone oil, flame retardant, crosslinking agent, diluent, conical filler and catalyst are mixed to obtain a protective coating with heat insulation function; the prepared protective coating not only has good heat resistance, ablation resistance, heat insulation performance, thermal stability and mechanical properties, but also expands its application range, and has good overall performance. DETAILED DESCRIPTION

[0050] With reference to the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of the present application.

[0051] The specific parameters of the raw materials used in the present application are as follows:

[0052] Bisphenol A type phenolic epoxy resin, model: F51, epoxy value: 0.51-0.54, provided by Jining Tangyi Chemical Co., Ltd.; epoxy-modified silicone resin, model: 023, epoxy value: 0.06-0.16, provided by Hubei Longshisihai New Material Co., Ltd.; 3-hydroxyphenylboronic acid, CAS number: 87199-18-6, product number: H810863, provided by Shanghai Maikelin Biochemical Technology Co., Ltd.; aminophenyl POSS, CAS number: 518359-82-5, product number: P833915, provided by Shanghai Maikelin Biochemical Technology Co., Ltd.; graphene oxide, number: S25040, provided by Shanghai Yuanye Biotechnology Co., Ltd.; kaolin, CAS number: 1332-58-7, product number: K812209, provided by Shanghai Maikelin Biochemical Technology Co., Ltd.

[0053] The preparation method of N-(4-hydroxyphenyl)-maleamic acid comprises the following steps:

[0054] According to the mass ratio of maleic anhydride to acetone of 2.6:10, maleic anhydride is added to acetone and mixed uniformly to obtain solution A. According to the mass ratio of p-aminophenol to acetone of 2.7:5, p-aminophenol is added to acetone and mixed uniformly to obtain solution B. According to the mass ratio of solution B to solution A of 1:1, solution B is added to solution A, and then reacted in an ice water bath at 4℃ for 2h. After the reaction is completed, filtration is performed, washing is performed with acetone (the mass of acetone is 5 times the mass of maleic anhydride), and finally vacuum drying is performed at 70℃ for 24h to obtain N-(4-hydroxyphenyl)-maleamic acid.

[0055] Example 1

[0056] The modified resin composite material is prepared by the following specific steps:

[0057] S1: according to the mass ratio of silanized reinforcing material, aromatic compound, azobisisobutyronitrile, toluene is 0.9:1.8:0.03:45, the silanized reinforcing material and the aromatic compound are mixed uniformly, then the azobisisobutyronitrile and the toluene are added, and stirred for 20 min under the nitrogen atmosphere, then reacted for 22 h at 80℃, cooled to room temperature, filtered, washed with toluene for 3 times (the mass of toluene each time is 30% of the mass of the above toluene), and finally dried under vacuum at 60℃ for 24 h to obtain the composite material, wherein the aromatic compound is composed of N-(4-hydroxyphenyl)-maleamic acid and 3-hydroxyphenylboronic acid according to the mass ratio of 0.9:0.6;

[0058] The preparation method of the silanized reinforcing material comprises the following steps:

[0059] According to the mass ratio of reinforcing material, ethanol is 0.8:50, the reinforcing material is added into the ethanol, and ultrasonic treatment is carried out for 30 min (ultrasonic power is 100 W, ultrasonic frequency is 40 kHz) to obtain a dispersion liquid, according to the mass ratio of γ-methacryloxypropyl trimethoxysilane, deionized water is 0.9:10, γ-methacryloxypropyl trimethoxysilane is added into deionized water, acetic acid is added, and stirring is carried out until the pH value of the solution is 4 to obtain a silane solution, according to the mass ratio of the silane solution and the dispersion liquid is 2:1, the silane solution is added into the dispersion liquid, then reacted for 11 h at 55℃, after the reaction is completed, washed with ethanol for 3 times (the mass of ethanol each time is 20% of the mass of the above ethanol), and finally dried at 60℃ for 4 h to obtain the silanized reinforcing material;

[0060] The preparation method of the reinforcing material comprises the following steps:

[0061] According to the mass ratio of thermal insulation filler, tetrahydrofuran, amine phenyl POSS, N,N'-dicyclohexyl carbodiimide, 4-dimethylamino pyridine is 0.1:45:0.9:0.8:0.4, the thermal insulation filler is added into the tetrahydrofuran, and ultrasonic treatment is carried out for 25 min (ultrasonic power is 100 W, ultrasonic frequency is 40 kHz), then amine phenyl POSS, N,N'-dicyclohexyl carbodiimide and 4-dimethylamino pyridine are added, and stirring is carried out for 15 min, then heated to 55℃, and stirred under the nitrogen atmosphere to reflux for 22 h, after the reaction is completed, centrifuged at a speed of 10000 rpm for 15 min, washed with tetrahydrofuran for 3 times (the mass of tetrahydrofuran each time is 20% of the mass of the above tetrahydrofuran), and freeze-dried at minus 30℃ for 24 h to obtain the reinforcing material, wherein the thermal insulation filler is composed of graphene oxide and kaolin according to the mass ratio of 0.7:0.4;

[0062] S2: according to the mass ratio of the composite material, dimethyl sulfoxide, resin compound is 0.1:90:4.9, the composite material in step S1 is added into dimethyl sulfoxide, and ultrasonic dispersion is carried out for 1.5h (ultrasonic power is 100W, ultrasonic frequency is 40kHz), then the resin compound is added, after mixing uniformly, 10wt% sodium hydroxide aqueous solution (sodium hydroxide aqueous solution is 0.1% of the mass of dimethyl sulfoxide) is added, then the temperature is raised to 65 DEG C, and the reaction is kept for 4.5h, after the reaction is completed, the temperature is cooled to room temperature, and then the mixture is washed with ethanol and deionized water for 3 times respectively (each time the mass of ethanol is 10% of the mass of dimethyl sulfoxide, and the mass of deionized water is 15% of the mass of dimethyl sulfoxide), then the mixture is centrifuged at a speed of 10000 rpm for 20 min, then isophorone diamine (isophorone diamine is 20% of the mass of resin compound) is added, and the mixture is kept at room temperature for 24h, and finally the modified resin composite material is obtained, wherein the resin compound is composed of bisphenol A type phenolic epoxy resin and epoxy modified silicone resin with a mass ratio of 1:0.3;

[0063] A protective coating with heat insulation function comprises the following raw materials by weight: 50 parts of modified resin composite material, 30 parts of vinyl silicone oil, 20 parts of phenyl silicone oil, 10 parts of aluminum hydroxide, 5 parts of chopped glass fiber, 2 parts of methyl hydrogen-containing silicone oil, 0.1 part of chloroplatinic acid and 150 parts of No. 120 solvent oil;

[0064] The preparation method comprises the following steps:

[0065] The raw materials are weighed, the modified resin composite material, vinyl silicone oil, phenyl silicone oil, aluminum hydroxide, methyl hydrogen-containing silicone oil and 1 / 3 of the mass of the formula of No. 120 solvent oil are mixed, then stirred for 20 min to obtain component A, the chopped glass fiber, chloroplatinic acid and the remaining No. 120 solvent oil are mixed and stirred for 10 min to obtain component B, and then component A and component B are uniformly mixed to obtain the protective coating with heat insulation function.

[0066] Example 2

[0067] The modified resin composite material is prepared by the following steps:

[0068] S1: according to the mass ratio of silanized reinforcing material, aromatic compound, azobisisobutyronitrile and toluene is 1:2:0.04:50, the silanized reinforcing material and the aromatic compound are uniformly mixed, then the azobisisobutyronitrile and the toluene are added, and stirred for 25 min under nitrogen atmosphere, then reacted at 85 DEG C for 23h, cooled to room temperature, filtered, washed with toluene for 3 times (each time the mass of toluene is 30% of the mass of the above toluene), and finally dried at 65 DEG C under vacuum for 24h to obtain the composite material, wherein the aromatic compound is composed of N-(4-hydroxyphenyl)-maleamic acid and 3-hydroxyphenylboronic acid with a mass ratio of 0.95:0.65.

[0069] The preparation method of the silanized reinforcing material comprises the following steps:

[0070] According to the mass ratio of the reinforcing material to ethanol of 1:55, the reinforcing material is added into ethanol and ultrasonic treatment is carried out for 35 min (ultrasonic power is 100 W and ultrasonic frequency is 40 kHz), to obtain a dispersion liquid, according to the mass ratio of γ-methacryloxypropyl trimethoxysilane to deionized water of 1:12, the γ-methacryloxypropyl trimethoxysilane is added into the deionized water, and then acetic acid is added and stirred until the pH value of the solution is 4.5, to obtain a silane solution, according to the mass ratio of the silane solution to the dispersion liquid of 2:1, the silane solution is added into the dispersion liquid, and then reaction is carried out at 60℃ for 12 h, after the reaction is completed, washing is carried out with ethanol for 3 times (the mass of ethanol each time is 20% of the mass of the above ethanol), and finally drying is carried out at 65℃ for 5 h, to obtain the silanized reinforcing material;

[0071] The preparation method of the reinforcing material comprises the following steps:

[0072] According to the mass ratio of the thermal insulation filler to tetrahydrofuran, aminophenyl POSS, N,N'-dicyclohexyl carbodiimide and 4-dimethylaminopyridine of 0.2:50:1:0.85:0.45, the thermal insulation filler is added into tetrahydrofuran and ultrasonic treatment is carried out for 30 min (ultrasonic power is 100 W and ultrasonic frequency is 40 kHz), then aminophenyl POSS, N,N'-dicyclohexyl carbodiimide and 4-dimethylaminopyridine are added and stirred for 20 min, then heating is carried out to 60℃ and stirring is carried out under a nitrogen atmosphere to reflux for 23 h, after the reaction is completed, centrifugation is carried out at a speed of 15000 rpm for 12 min, washing is carried out with tetrahydrofuran for 3 times (the mass of tetrahydrofuran each time is 20% of the mass of the above tetrahydrofuran), and freezing drying is carried out at minus 25℃ for 24 h, to obtain the reinforcing material, wherein the thermal insulation filler is composed of graphene oxide and kaolin according to the mass ratio of 0.75:0.45;

[0073] S2: according to the mass ratio of the composite material, dimethyl sulfoxide, resin compound is 0.2:100:5, the composite material in step S1 is added into dimethyl sulfoxide, and ultrasonic dispersion is carried out for 2h (ultrasonic power is 100W, ultrasonic frequency is 40kHz), then the resin compound is added, after mixing uniformly, 10wt% sodium hydroxide aqueous solution (sodium hydroxide aqueous solution is 0.1% of the mass of dimethyl sulfoxide) is added, then the temperature is raised to 70 DEG C, and the reaction is kept for 5h, after the reaction is completed, the temperature is cooled to room temperature, and then the mixture is washed with ethanol and deionized water for 3 times respectively (each time the mass of ethanol is 10% of the mass of dimethyl sulfoxide, and the mass of deionized water is 15% of the mass of dimethyl sulfoxide), centrifugation is carried out at a speed of 12000 rpm for 15 min, then isophorone diamine (isophorone diamine is 20% of the mass of resin compound) is added, and the mixture is kept at room temperature for 24h, and finally the modified resin composite material is obtained, wherein the resin compound is composed of bisphenol A type phenolic epoxy resin and epoxy modified silicone resin with a mass ratio of 1.1:0.35;

[0074] A protective coating with heat insulation function comprises the following raw materials by weight: modified resin composite material 60 parts, vinyl silicone oil 35 parts, phenyl silicone oil 25 parts, platinum hydroxide 15 parts, chopped quartz fiber 8 parts, side hydrogen-containing silicone oil 4 parts, chloroplatinic acid 0.2 parts and ethyl acetate 200 parts;

[0075] The preparation method comprises the following steps:

[0076] The raw materials are weighed, the modified resin composite material, vinyl silicone oil, phenyl silicone oil, platinum hydroxide, side hydrogen-containing silicone oil and 1 / 3 of the mass of ethyl acetate are mixed, then stirred for 25 min to obtain component A, the chopped quartz fiber, chloroplatinic acid and the remaining ethyl acetate are mixed and stirred for 12 min to obtain component B, and then component A and component B are uniformly mixed to obtain the protective coating with heat insulation function.

[0077] Example 3

[0078] The modified resin composite material is prepared by the following steps:

[0079] S1: according to the mass ratio of silanized reinforcing material, aromatic compound, azobisisobutyronitrile and toluene is 1.1:2.2:0.05:55, the silanized reinforcing material and the aromatic compound are uniformly mixed, then the azobisisobutyronitrile and the toluene are added, and stirred for 30 min under nitrogen atmosphere, then reacted at 90 DEG C for 24h, cooled to room temperature, filtered, washed with toluene for 3 times (each time the mass of toluene is 30% of the mass of toluene), and finally dried at 70 DEG C under vacuum for 24h to obtain the composite material, wherein the aromatic compound is composed of N-(4-hydroxyphenyl)-maleamic acid and 3-hydroxyphenylboronic acid with a mass ratio of 1:0.7;

[0080] The preparation method of the silanized reinforcing material comprises the following steps:

[0081] According to the mass ratio of the reinforcing material to ethanol of 1.2:60, the reinforcing material is added into ethanol and ultrasonic treatment is performed for 40 min (ultrasonic power is 100 W and ultrasonic frequency is 40 kHz) to obtain a dispersion liquid, according to the mass ratio of γ-methacryloxypropyl trimethoxysilane to deionized water of 1.1:15, the γ-methacryloxypropyl trimethoxysilane is added into the deionized water, acetic acid is further added, and stirring is performed until the pH value of the solution is 5 to obtain a silane solution, according to the mass ratio of the silane solution to the dispersion liquid of 2:1, the silane solution is added into the dispersion liquid, then reaction is performed at 65℃ for 13 h, after the reaction is completed, washing is performed with ethanol for 3 times (the mass of ethanol each time is 20% of the mass of the above ethanol), and finally drying is performed at 70℃ for 6 h to obtain the silanized reinforcing material;

[0082] The preparation method of the reinforcing material comprises the following steps:

[0083] According to the mass ratio of the thermal insulation filler to tetrahydrofuran, aminophenyl POSS, N,N'-dicyclohexyl carbodiimide and 4-dimethylaminopyridine of 0.3:55:1.1:0.9:0.5, the thermal insulation filler is added into tetrahydrofuran and ultrasonic treatment is performed for 35 min (ultrasonic power is 100 W and ultrasonic frequency is 40 kHz), then aminophenyl POSS, N,N'-dicyclohexyl carbodiimide and 4-dimethylaminopyridine are added and stirring is performed for 25 min, then heating is performed to 65℃, and stirring is performed under a nitrogen atmosphere and reflux is performed for 24 h, after the reaction is completed, centrifugation is performed at a speed of 20000 rpm for 10 min, washing is performed with tetrahydrofuran for 3 times (the mass of tetrahydrofuran each time is 20% of the mass of the above tetrahydrofuran), and freezing drying is performed at minus 20℃ for 24 h to obtain the reinforcing material, wherein the thermal insulation filler is composed of graphene oxide and kaolin according to the mass ratio of 0.8:0.5;

[0084] S2: according to the mass ratio of the composite material, dimethyl sulfoxide, resin compound is 0.3:110:5.1, the composite material in step S1 is added into dimethyl sulfoxide, and ultrasonic dispersion is carried out for 2.5h (ultrasonic power is 100W, ultrasonic frequency is 40kHz), then the resin compound is added, after mixing uniformly, 10wt% sodium hydroxide aqueous solution (the mass of sodium hydroxide aqueous solution is 0.1% of the mass of dimethyl sulfoxide) is added, then the temperature is increased to 75℃, and the reaction is kept for 5.5h, after the reaction is completed, the temperature is cooled to room temperature, and then the mixture is washed with ethanol and deionized water for 3 times respectively (the mass of ethanol is 10% of the mass of dimethyl sulfoxide, and the mass of deionized water is 15% of the mass of dimethyl sulfoxide), the mixture is centrifuged at a speed of 15000rpm for 10min, then isophorone diamine (the mass of isophorone diamine is 20% of the mass of resin compound) is added, and the mixture is kept at room temperature for 24h, and finally the modified resin composite material is obtained, wherein the resin compound is composed of bisphenol A type phenolic epoxy resin and epoxy modified silicone resin with a mass ratio of 1.2:0.4;

[0085] A protective coating with heat insulation function, comprising the following raw materials by weight: 70 parts of modified resin composite material, 40 parts of vinyl silicone oil, 30 parts of phenyl silicone oil, 20 parts of magnesium hydroxide, 10 parts of mullite fiber, 5 parts of hydrogen-terminated silicone oil, 0.3 parts of chloroplatinic acid and 250 parts of No.120 solvent oil;

[0086] The preparation method comprises the following steps:

[0087] The raw materials are weighed, the modified resin composite material, vinyl silicone oil, phenyl silicone oil, magnesium hydroxide, hydrogen-terminated silicone oil and 1 / 3 of the mass of No.120 solvent oil are mixed, then stirred for 30min to obtain component A, the mullite fiber, chloroplatinic acid and the remaining No.120 solvent oil are mixed and stirred for 15min to obtain component B, and then the component A and the component B are mixed uniformly to obtain the protective coating with heat insulation function.

[0088] Comparative Example 1

[0089] The difference between the present comparative example and Example 3 is that, when preparing the modified resin composite material, the aromatic compound in step S1 is replaced by N-(4-hydroxyphenyl)-maleamic acid with the same mass, and the remaining steps and raw materials are implemented synchronously with Example 3;

[0090] S1 : according to the mass ratio of silanized reinforcing material, N-(4-hydroxyphenyl)-maleamic acid, azobisisobutyronitrile, toluene is 1.1:2.2:0.05:55, the silanized reinforcing material and N-(4-hydroxyphenyl)-maleamic acid are mixed uniformly, then azobisisobutyronitrile and toluene are added, and stirred for 30 min under nitrogen atmosphere, then reacted at 90℃ for 24h, cooled to room temperature, filtered, washed with toluene for 3 times (the mass of toluene each time is 30% of the above toluene mass), and finally dried at 70℃ under vacuum for 24h to obtain the composite material.

[0091] Comparative Example 2

[0092] The difference between this comparative example and Example 3 is that when preparing the modified resin composite material, the aromatic compound in step S1 is replaced by 3-hydroxyphenylboronic acid in equal mass, and the remaining steps and raw materials are implemented synchronously with Example 3.

[0093] S1 : according to the mass ratio of silanized reinforcing material, N-(4-hydroxyphenyl)-maleamic acid, azobisisobutyronitrile, toluene is 1.1:2.2:0.05:55, the silanized reinforcing material and N-(4-hydroxyphenyl)-maleamic acid are mixed uniformly, then azobisisobutyronitrile and toluene are added, and stirred for 30 min under nitrogen atmosphere, then reacted at 90℃ for 24h, cooled to room temperature, filtered, washed with toluene for 3 times (the mass of toluene each time is 30% of the above toluene mass), and finally dried at 70℃ under vacuum for 24h to obtain the composite material.

[0094] Comparative Example 3

[0095] The difference between this comparative example and Example 3 is that when preparing the modified resin composite material, the heat insulation filler in step S1 is replaced by graphene oxide in equal mass, and the remaining steps and raw materials are implemented synchronously with Example 3.

[0096] The preparation method of the reinforcing material comprises the following steps:

[0097] According to the mass ratio of graphene oxide, tetrahydrofuran, amine phenyl POSS, N,N'-dicyclohexyl carbodiimide, 4-dimethylamino pyridine is 0.3:55:1.1:0.9:0.5, graphene oxide is added to tetrahydrofuran, and ultrasonic treatment is carried out for 35 min (ultrasonic power is 100 W, ultrasonic frequency is 40 kHz), then amine phenyl POSS, N,N'-dicyclohexyl carbodiimide and 4-dimethylamino pyridine are added, and stirred for 25 min, then heated to 65℃, and stirred under nitrogen atmosphere for 24h, after the reaction is completed, centrifuged at a speed of 20000 rpm for 10 min, washed with tetrahydrofuran for 3 times (the mass of tetrahydrofuran each time is 20% of the above tetrahydrofuran mass), and freeze-dried at minus 20℃ for 24h to obtain the reinforcing material.

[0098] Comparative Example 4

[0099] The difference between the present comparative example and Example 3 is that, in the preparation of the modified resin composite material, the thermal insulation filler in step S1 is replaced by kaolin with the same mass, and the remaining steps and raw materials are implemented synchronously with Example 3.

[0100] The preparation method of the reinforcing material comprises the following steps:

[0101] According to the mass ratio of kaolin, tetrahydrofuran, amine phenyl POSS, N,N'-dicyclohexyl carbodiimide, and 4-dimethylaminopyridine being 0.3:55:1.1:0.9:0.5, the kaolin is added to the tetrahydrofuran and ultrasonically treated for 35 min (ultrasonic power is 100 W and ultrasonic frequency is 40 kHz), then the amine phenyl POSS, N,N'-dicyclohexyl carbodiimide and 4-dimethylaminopyridine are added and stirred for 25 min, then heated to 65°C and stirred under a nitrogen atmosphere for 24 h, after the reaction is completed, centrifuged at a speed of 20000 rpm for 10 min, washed with tetrahydrofuran for 3 times (each time the mass of tetrahydrofuran is 20% of the mass of the above tetrahydrofuran), and freeze-dried at minus 20°C for 24 h to obtain the reinforcing material.

[0102] Comparative Example 5

[0103] The difference between the present comparative example and Example 3 is that, in the preparation of the modified resin composite material, the reinforcing material in step S1 is composed of a mixture of thermal insulation filler and amine phenyl POSS, and the preparation step of the original reinforcing material is deleted, and the remaining steps and raw materials are implemented synchronously with Example 3.

[0104] The preparation method of the silanized reinforcing material comprises the following steps:

[0105] According to the mass ratio of the reinforcing material and ethanol being 1.2:60, the reinforcing material is added to the ethanol and ultrasonically treated for 40 min (ultrasonic power is 100 W and ultrasonic frequency is 40 kHz) to obtain a dispersion liquid, according to the mass ratio of γ-methacryloxypropyl trimethoxysilane and deionized water being 1.1:15, the γ-methacryloxypropyl trimethoxysilane is added to the deionized water, then acetic acid is added and stirred until the pH value of the solution is 5 to obtain a silane solution, according to the mass ratio of the silane solution and the dispersion liquid being 2:1, the silane solution is added to the dispersion liquid, then reacted at 65°C for 13 h, after the reaction is completed, washed with ethanol for 3 times (each time the mass of ethanol is 20% of the mass of the above ethanol), and finally dried at 70°C for 6 h to obtain the silanized reinforcing material, wherein the reinforcing material is composed of a mixture of thermal insulation filler and amine phenyl POSS with a mass ratio of 0.3:1.1; the thermal insulation filler is composed of a mixture of graphene oxide and kaolin with a mass ratio of 0.8:0.5.

[0106] Comparative Example 6

[0107] The difference between this comparative example and Example 3 is that, in the preparation of the modified resin composite material, the resin compound in step S2 is replaced with an equal amount of bisphenol A type phenolic epoxy resin, and the remaining steps and raw materials are the same as in Example 3.

[0108] S2: According to the mass ratio of composite material, dimethyl sulfoxide, and bisphenol A type phenolic epoxy resin of 0.3:110:5.1, the composite material in step S1 is added to dimethyl sulfoxide and ultrasonically dispersed for 2.5 h (ultrasonic power is 100 W and ultrasonic frequency is 40 kHz), then bisphenol A type phenolic epoxy resin is added, and after mixing uniformly, 10 wt% sodium hydroxide aqueous solution (sodium hydroxide aqueous solution mass is 0.1% of dimethyl sulfoxide mass) is added, then the temperature is raised to 75°C, and the reaction is kept for 5.5 h. After the reaction is completed, the temperature is cooled to room temperature, and then washed with ethanol and deionized water for 3 times each (ethanol mass is 10% of dimethyl sulfoxide mass, and deionized water mass is 15% of dimethyl sulfoxide mass), centrifuged at a speed of 15000 rpm for 10 min, then isophorone diamine (isophorone diamine mass is 20% of bisphenol A type phenolic epoxy resin mass) is added, and left to stand at room temperature for 24 h, and finally the modified resin composite material is obtained.

[0109] Comparative Example 7

[0110] The difference between this comparative example and Example 3 is that, in the preparation of the modified resin composite material, the resin compound in step S2 is replaced with an equal amount of bisphenol A type phenolic epoxy resin, and the remaining steps and raw materials are the same as in Example 3.

[0111] S2: According to the mass ratio of composite material, dimethyl sulfoxide, and bisphenol A type phenolic epoxy resin of 0.3:110:5.1, the composite material in step S1 is added to dimethyl sulfoxide and ultrasonically dispersed for 2.5 h (ultrasonic power is 100 W and ultrasonic frequency is 40 kHz), then bisphenol A type phenolic epoxy resin is added, and after mixing uniformly, 10 wt% sodium hydroxide aqueous solution (sodium hydroxide aqueous solution mass is 0.1% of dimethyl sulfoxide mass) is added, then the temperature is raised to 75°C, and the reaction is kept for 5.5 h. After the reaction is completed, the temperature is cooled to room temperature, and then washed with ethanol and deionized water for 3 times each (ethanol mass is 10% of dimethyl sulfoxide mass, and deionized water mass is 15% of dimethyl sulfoxide mass), centrifuged at a speed of 15000 rpm for 10 min, then isophorone diamine (isophorone diamine mass is 20% of bisphenol A type phenolic epoxy resin mass) is added, and left to stand at room temperature for 24 h, and finally the modified resin composite material is obtained.

[0112] Comparative Example 8

[0113] The comparative example is different from example 3 in that the modified resin composite is prepared by directly mixing the silanized reinforcing material and the aromatic compound in step S2, and the original step S1 is deleted, and the remaining steps and raw materials are implemented synchronously with example 3.

[0114] The modified resin composite is prepared by the following steps:

[0115] The composite material, dimethyl sulfoxide, and resin compound are mixed according to a mass ratio of 0.3:110:5.1. The composite material is added to the dimethyl sulfoxide and ultrasonically dispersed for 2.5 h (ultrasonic power is 100 W and ultrasonic frequency is 40 kHz). Then, the resin compound is added, and 10 wt% sodium hydroxide aqueous solution (the mass of sodium hydroxide aqueous solution is 0.1% of the mass of dimethyl sulfoxide) is added after uniform mixing. Then, the temperature is increased to 75°C, and the reaction is kept for 5.5 h. After the reaction is completed, the temperature is cooled to room temperature. The mixture is washed with ethanol and deionized water for 3 times respectively (the mass of ethanol is 10% of the mass of dimethyl sulfoxide, and the mass of deionized water is 15% of the mass of dimethyl sulfoxide). The mixture is centrifuged at a speed of 15000 rpm for 10 min. Then, isophorone diamine (the mass of isophorone diamine is 20% of the mass of resin compound) is added, and the mixture is kept at room temperature for 24 h. Finally, the modified resin composite is obtained. The composite material is composed of silanized reinforcing material and aromatic compound according to a mass ratio of 1.1:2.2. The resin compound is composed of bisphenol A type phenolic epoxy resin and epoxy modified silicone resin according to a mass ratio of 1.2:0.4.

[0116] The protective coatings prepared in examples 1-3 and comparative examples 1-8 are tested for mechanical properties, thermal insulation properties, and ablation resistance. The tensile strength and elongation at break are tested according to GB / T 1040.2-2006 standard, and the shear strength is tested according to GB / T 7124-2008 standard. The thermal conductivity is determined according to GB / T 10297-2015 standard. The linear ablation rate is determined according to GJB 323A-96 national military standard.

[0117] The test results are shown in Table 1 below:

[0118] Table 1 Performance parameters of protective coatings prepared in examples 1-3 and comparative examples 1-8

[0119]

[0120] From the data in Table 1 above, it can be seen from the comparison between Comparative Example 1-2 and Example 3 that the aromatic compound in step S1 is replaced with N-(4-hydroxyphenyl)-maleamic acid or 3-hydroxyphenylboronic acid in equal mass to prepare a protective coating with thermal insulation function, and the test results are poorer than those of Example 3, indicating that the aromatic compound composed of N-(4-hydroxyphenyl)-maleamic acid and 3-hydroxyphenylboronic acid has a synergistic effect, not only has good heat resistance and thermal stability, but also has good bonding force with the silanized composite material, which can further improve the thermal insulation performance, ablation resistance and mechanical properties of the protective coating.

[0121] From the comparison between Comparative Example 3-5 and Example 3, it can be seen that the thermal insulation filler in step S1 is replaced with graphene oxide or kaolin in equal mass, or the reinforcing material in step S1 is composed of a mixture of thermal insulation filler and aminophenyl POSS, to prepare a protective coating with thermal insulation function, and the test results are poorer than those of Example 3, indicating that the thermal insulation filler composed of a mixture of graphene oxide and kaolin has good thermal insulation performance, and has good bonding force with aminophenyl POSS, which can effectively improve the thermal insulation performance and mechanical properties of the protective coating; the thermal insulation filler and aminophenyl POSS are combined by chemical means, not only the bonding force is better, but also the dispersibility is improved, further enhancing the ablation resistance, thermal insulation performance, thermal stability and mechanical properties of the protective coating.

[0122] From the comparison between Comparative Example 6-8 and Example 3, it can be seen that the resin compound in step S2 is replaced with bisphenol A type phenolic epoxy resin or epoxy modified silicone resin in equal mass, or the composite material in step S2 is directly mixed from silanized reinforcing material and aromatic compound, to finally prepare a protective coating with thermal insulation function, and the test results are poorer than those of Example 3, indicating that the resin compound composed of a mixture of bisphenol A type phenolic epoxy resin and epoxy modified silicone resin has good heat resistance and thermal stability, which can better improve the ablation resistance, thermal insulation performance and mechanical properties of the protective coating; the silanized reinforcing material and the resin compound are combined by the aromatic compound, increasing the bonding force between the three, and improving the dispersibility and compatibility of the silanized reinforcing material in the resin compound, further enhancing the ablation resistance, thermal insulation performance, heat resistance and mechanical properties of the protective coating.

[0123] From the above table 1, the protective coating with heat insulation function prepared by examples 1-3 compared with the protective coating with heat insulation function prepared by comparative examples 1-8, the aromatic compound is combined with silane enhanced material, then combined with resin compound, add curing agent, obtain modified resin composite material;The modified resin composite material, vinyl silicone oil, phenyl silicone oil, flame retardant, crosslinking agent, diluent, conical filler, catalyst are mixed, finally obtain the protective coating with heat insulation function, reach the requirement of test performance, while the protective coating with heat insulation function prepared by comparative examples 1-8 does not reach the standard of performance requirement, it is proved that the protective coating with heat insulation function prepared by the application has good heat resistance, ablation resistance, heat insulation performance and mechanical properties, and expands its application range, and its comprehensive performance is good.

[0124] In the description of the specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0125] The above is only an example and description of the application, those skilled in the art can make various modifications or supplements to the described specific embodiments or adopt similar ways to replace, as long as it does not deviate from the application or exceed the scope defined by the present claims, which shall belong to the protection scope of the application.

Claims

1. A protective coating with heat insulation function, characterized in that, The raw materials include the following components by weight: modified resin composite material 50-70 parts, vinyl silicone oil 30-40 parts, phenyl silicone oil 20-30 parts, flame retardant 10-20 parts, conical filler 5-10 parts, crosslinking agent 2-5 parts, catalyst 0.1-0.3 parts, and diluent 150-250 parts; The preparation method of the modified resin composite material comprises the following steps: S1: obtaining a composite material by combining an aromatic compound with a silanized reinforcing material; S2: obtaining the modified resin composite material by combining the composite material with a resin compound and then adding a curing agent; The conical filler is at least one of chopped glass fiber, chopped quartz fiber, mullite fiber, and chopped high-silica fiber; Step S1 is specifically as follows: The silanized reinforcing material and the aromatic compound are mixed uniformly, then an initiator and toluene are added, and stirring is performed under a nitrogen atmosphere for 20-30 min, then reaction is performed at 80-90℃ for 22-24 h, the mixture is cooled to room temperature, filtered, washed with toluene, and finally vacuum dried at 60-70℃ to obtain the composite material; The aromatic compound is composed of N-(4-hydroxyphenyl)-maleamic acid and 3-hydroxyphenylboronic acid in a mass ratio of 0.9-1:0.6-0.7; The preparation method of the silanized reinforcing material comprises the following steps: The reinforcing material is added to ethanol and ultrasonically treated for 30-40 min to obtain a dispersion liquid, a silane coupling agent is added to deionized water, then acetic acid is added and stirring is performed until the pH value of the solution reaches 4-5 to obtain a silane solution, the silane solution is added to the dispersion liquid, and then reaction is performed at 55-65℃ for 11-13 h, after the reaction is completed, the mixture is washed with ethanol, and finally dried at 60-70℃ to obtain the silanized reinforcing material; The silane coupling agent is γ-methacryloxypropyltrimethoxysilane; The preparation method of the reinforcing material comprises the following steps: The thermal insulation filler is added to tetrahydrofuran and ultrasonically treated for 25-35 min, then amine phenyl POSS, N,N'-dicyclohexyl carbodiimide, and 4-dimethylamino pyridine are added and stirred for 15-25 min, then heated to 55-65℃ and stirred under a nitrogen atmosphere at reflux for 22-24 h, after the reaction is completed, centrifugation is performed for 10-15 min, the mixture is washed with tetrahydrofuran, and freeze-dried to obtain the reinforcing material; The thermal insulation filler is composed of graphene oxide and kaolin in a mass ratio of 0.7-0.8:0.4-0.

5.

2. The protective paint with heat insulation function according to claim 1, characterized in that, Step S2 is specifically as follows: The composite material in step S1 is added to dimethyl sulfoxide and ultrasonically dispersed for 1.5-2.5 h, then a resin compound is added, the mixture is mixed uniformly, then an aqueous sodium hydroxide solution is added, then the temperature is raised to 65-75℃ and the mixture is kept at this temperature for 4.5-5.5 h, after the reaction is completed, the mixture is cooled to room temperature, washed with ethanol and deionized water, centrifuged for 10-20 min, then a curing agent is added, the mixture is kept at room temperature, and finally the modified resin composite material is obtained.

3. The protective paint with heat insulation function according to claim 2, characterized in that, The resin compound is composed of bisphenol A type phenolic epoxy resin and epoxy modified silicone resin in a mass ratio of 1-1.2:0.3-0.

4.

4. The protective paint with heat insulation function according to claim 2, characterized in that, The curing agent is isophorone diamine.

5. A method for producing the protective paint having a heat insulation function according to any one of claims 1 to 4, characterized by, The method comprises the following steps: The raw materials are weighed, the modified resin composite, vinyl silicone oil, phenyl silicone oil, flame retardant, crosslinking agent and diluent are mixed, and then stirred for 20-30 min to obtain component A; the conical filler, catalyst and diluent are mixed and stirred for 10-15 min to obtain component B; and component A and component B are uniformly mixed to finally obtain the protective coating with heat insulation function.

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