CN-118440596-B - Integrated finishing paint with auxiliary heat protection and three-proofing functions and preparation method thereof

Abstract

The invention relates to the technical field of external heat-proof materials and discloses an integrated finishing paint with auxiliary heat-proof and three-proof functions and a preparation method thereof, wherein the integrated finishing paint comprises, by weight, 50 parts of methyl vinyl MQ silicon resin A, 5-20 parts of methyl vinyl MQ silicon resin B, 50-70 parts of base polymer, 1-2 parts of auxiliary agent, 15-30 parts of reinforcing filler, 0-50 parts of silicone color paste, 0.5-3 parts of mildew inhibitor, 10-20 parts of hot-melt material/phase-change material, 4-6 parts of cross-linking agent, 0.1-0.3 part of inhibitor, 0.8-2.0 parts of platinum catalyst and 150-300 parts of diluent, and the integrated finishing paint with auxiliary heat-proof and three-proof functions can be obtained by mixing the above components for reaction, so that the anti-ablation performance of the heat-proof material can be effectively improved, and the integrated finishing paint has excellent heat-proof and heat-proof functions and can be widely applied to the external heat-proof materials.

Inventors

• XIAO YONG
• TIAN KANGYONG
• LU MINGTAO
• CHEN HAIYA
• XIANG SHIPING
• WANG JUNXUN
• Huang Gengqiao
• XIONG FENG
• QIN YI
• YANG WEI

Assignees

• 湖北航聚科技股份有限公司

Dates

Publication Date

20260512

Application Date

20240418

Claims (8)

1. 1. The integrated finishing paint with the auxiliary heat protection and three-proofing functions is characterized by comprising the following components in parts by weight: methyl vinyl MQ silicone resin A35 parts 5-20 Parts of methyl vinyl MQ silicone resin B 50-70 Parts of base polymer 1-2 Parts of auxiliary agent 15-30 Parts of reinforcing filler 0-50 Parts of silicone color paste 0.5-3 Parts of mildew preventive 10-20 Parts of hot-melt material/phase-change material 4-6 Parts of cross-linking agent 0.1-0.3 Part of inhibitor 0.8-2.0 Parts of platinum catalyst 150-300 Parts of a diluent; the molecular weight of the methyl vinyl MQ silicone resin A is 4000-8000 g/mol, the chain link number ratio of M/Q is 0.6-1.0, and the vinyl mass content is 0.7-1.8%; The molecular weight of the methyl vinyl MQ silicone resin B is 1000-2000 g/mol, the chain unit number ratio of M/Q is 0.8-1.2, and the vinyl mass content is 2-4%; The hot-melt material/phase-change material comprises one or more of glass powder which melts at 350-1000 ℃, na 2 SO 4 /SiO 2 ceramic-based molten salt, naCl/SiC foam ceramic composite phase-change material, low-melting glass powder D255, naCl molten salt and silicon-aluminum eutectic alloy; the Na 2 SO 4 content in the Na 2 SO 4 /SiO 2 ceramic-based molten salt is 50%; The base polymer is vinyl-terminated poly (dimethylsiloxane), the viscosity of the base polymer is 450-2000 mPa.s, and the vinyl mass content is 0.1-0.3%.
2. 2. The integrated finishing paint with auxiliary heat protection and three-proofing functions according to claim 1, wherein the auxiliary agent comprises one or more of gamma-glycidol ether oxypropyl trimethoxysilane, gamma-methacryloxypropyl trimethoxysilane, trimethylethoxysilane, methyltrimethoxysilane and vinyltriethoxysilane.
3. 3. The integrated finishing paint with auxiliary heat protection and three-proofing functions according to claim 1, wherein the reinforcing filler comprises one or more of fumed silica and precipitated silica; the silicone color paste comprises one or more of black, white, red, yellow and blue silicone color pastes.
4. 4. The integrated finishing paint with auxiliary heat protection and three-proofing functions according to claim 1, wherein the mildew preventive comprises one or more of chlorothalonil, hupenzine, 2,4, 6-tribromophenol, methanesulfonyl tetrachloropyridine, moldproof phenol, chloroacetamide and benomyl.
5. 5. The integrated finishing paint with auxiliary heat protection and three-proofing functions according to claim 1, wherein the platinum catalyst comprises PT-5000 platinum catalyst, and the diluent comprises one or more of No. 120 solvent oil, ethyl acetate and butyl acetate.
6. 6. The integrated finishing paint with auxiliary heat protection and three-proofing functions according to claim 1, wherein the cross-linking agent comprises hydrogen-containing silicone oil with the viscosity of 30-40 mPa.s and the hydrogen group mass of 0.73-0.82%, and the inhibitor comprises one or more of methylbutynol, ethynyl cyclohexanol and 3, 5-dimethyl-1-hexyn-3-ol.
7. 7. The preparation method of the integrated finishing paint with auxiliary heat protection and three-proofing functions as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps: Adding methyl vinyl MQ type silicon resin A and methyl vinyl MQ type silicon resin B into a base polymer, heating and stirring to form uniformly dispersed liquid; Sequentially adding an auxiliary agent, a reinforcing filler, a silicone color paste, a mildew preventive and a phase change material/hot melt filler, carrying out premixing, grinding and dispersing, and then adding a platinum catalyst and a diluent to obtain a component A; uniformly mixing the inhibitor and the cross-linking agent to obtain a component B; And uniformly mixing the component A and the component B to obtain the integrated finishing paint with the auxiliary heat protection and three-proofing functions.
8. 8. The method for preparing the integrated finishing paint with auxiliary heat protection and three-proofing functions according to claim 7, wherein the temperature of heating and stirring is not lower than 100 ℃.

Description

Integrated finishing paint with auxiliary heat protection and three-proofing functions and preparation method thereof Technical Field The invention relates to the technical field of external heat-proof materials, in particular to an integrated finishing paint with auxiliary heat-proof and three-proof functions and a preparation method thereof. Background The heat protection system is an important guarantee for protecting the surface of the aircraft from being burnt due to overheat in flight. Existing thermal protection systems and materials mainly include non-ablative (reusable) and ablative types. The ablation heat protection is an active heat protection mode of exchanging consumed substances for heat protection effect, and has the advantages of safe and reliable work, high heat protection efficiency and strong capability of adapting to flow field change. Ablation heat protection is the only feasible heat protection mode for an aircraft which works under high heat flow conditions or cannot be accurately predicted in a heat environment, and the system is simple in structure. Currently, resin-based ablative heat protection is still considered to be the most effective, reliable, mature and economical means of heat protection, and is commonly employed in aerospace vehicle heat protection systems. The silicon-based heat-proof composite material is an important resin-based ablation heat-proof material, most of the silicon-based heat-proof composite material takes silicon rubber, silicon resin and the like as matrix phases, and light functional fillers such as hollow phenolic microspheres, hollow glass microspheres, hollow ceramic microspheres and the like and reinforcing materials such as chopped quartz fibers, carbon fibers and basalt fibers are introduced to realize the functions of low density and heat insulation integration, and the silicon-based heat-proof composite material can be cured at room temperature/under heating, has good high and low temperature resistance, is simple and easy to control in forming process and has excellent ablation resistance. The three-proofing paint not only gives the appearance and the sign of the material, but also has the protection functions of dampproofing, salt fog proofing, mould proofing and the like. In a broad sense, all faults of the equipment caused by the external environment should belong to the category of 'three-protection' protection. Three-proofing paint is increasingly used in aerospace vehicles. At present, the three-proofing paint with more applications at home and abroad mainly comprises six types of poly-p-xylene three-proofing paint, polyurethane three-proofing paint, acrylic resin three-proofing paint, epoxy resin three-proofing paint, synthetic rubber three-proofing paint and organosilicon three-proofing paint. The polyurethane three-proofing paint has the advantages of high price, good adhesive force, poor light aging resistance, poor flexibility, high shrinkage rate, difficult reworking, good protective performance due to the fact that a layer of film is formed on the surface of a base material by virtue of solvent volatilization of the synthetic rubber three-proofing paint, extremely poor adhesive force with the base material, and extremely good flight protection performance due to the fact that the organic three-proofing paint takes organic silicon as a base material, a basic structural unit of the organic silicon is formed by silicon-oxygen chain links, side chains are connected with other various organic groups through silicon atoms, and the special composition and molecular structure of the organic three-proofing paint also contain inorganic structures, so that the three-proofing paint is high-resistant, low-resistant, wen Wenyu wide, excellent in heat resistance, weather resistance, ageing resistance, moisture resistance and the like, extremely good in suitability for a silicon-based heat-resistant coating (the adhesion of other resins and the silicon-based heat-resistant coating is poor), and is suitable for being applied to a spacecraft, and is extremely good in the flight protection performance. With the rapid development of novel aerospace craft, the flying speed is higher and higher, the resin-based ablation heat-proof material has high heat and high enthalpy value under the aerobic environment and is aerobic for a long time, and phenomena such as cracking, pulverization, deformation and the like can occur, so that the ablation performance and the shearing resistance of the material are reduced, and the problem to be solved is important. Meanwhile, due to special use environment, the aerospace vehicle and the external heat-resistant coating thereof can be polluted, corroded and bred with mould under the conditions of chemical substances (such as fuel, coolant and the like), vibration, moisture, salt fog, humidity and high temperature, and the surfaces of the aerospace vehicle and the external heat-resistant coating are required to be covere