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High-temperature-resistant coating for polyimide composite material protection, and coating layer preparation method

A high-temperature-resistant coating and composite material technology, applied in the field of materials, can solve the problems of reducing the adhesion and bonding strength of coatings, not being as good as polyimide in heat resistance, short-term loss of high-temperature protection, etc., to improve thermal shock resistance and increase Temperature resistance, effect of reducing interfacial stress

Inactive Publication Date: 2020-02-14
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent "a polyimide composite material coated with a composite coating and its preparation method" (Patent No.: CN 108314795 A) discloses a method for preparing a surface coating of a polyimide composite material. Coating technology can be used to improve the high-temperature oxidation resistance of composite materials, so that the withstand temperature can be increased to 450 °C, but the coating preparation process relies on special process equipment such as supersonic flame spraying and plasma spraying, and the process is complicated and not suitable for large-scale The construction of small and large parts, and the damage of high-temperature and high-speed particles to the composite material substrate will reduce the material performance and the adhesion and bonding strength of the coating itself
[0004] The Chinese patent "Preparation Method of Heat-resistant Coating for Carbon Fiber Reinforced Polyimide Composite Board" (Patent No.: CN103952054 B) relates to the preparation of a heat-resistant coating for carbon fiber-reinforced polyimide composite board, the heat-resistant coating The resin matrix is ​​made of phenolic resin and epoxy resin. Their own temperature resistance level is not high, not as good as the heat resistance of polyimide itself. It can only provide short-term loss-type high-temperature protection. limited improvement

Method used

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  • High-temperature-resistant coating for polyimide composite material protection, and coating layer preparation method
  • High-temperature-resistant coating for polyimide composite material protection, and coating layer preparation method

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Experimental program
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preparation example Construction

[0032] The preparation method of the high temperature resistant coating for the protection of polyimide composite material includes the following steps: drying the temperature resistant functional powder and the inorganic coloring pigment under high temperature conditions, and adding the hybrid silicon resin, Solvents and additives, oscillate and grind at high speed for 1-2h in a closed container or equipment, and ultrasonic for 0.5-1h to obtain high-temperature resistant coatings for polyimide composite material protection.

[0033] The present invention also provides a method for preparing a high temperature resistant coating protected by a polyimide composite material, which specifically includes the following steps: (1) Substrate pretreatment: the surface of the polyimide composite material substrate is polished with sandpaper or a polishing device To a certain degree of roughness, clean the surface stains with a volatile solvent. After the solvent evaporates, place it in an o...

Embodiment 1

[0040] Weigh 40 parts of polysilazane resin, 3 parts of silicon dioxide, 7 parts of silicon carbide, 20 parts of titanium dioxide, 0.5 parts of thickener, and 20 parts of xylene into the batching tank. Use a high-speed mixer at 800r / min. After pre-dispersing for 45 minutes, the uniformly stirred slurry is loaded with a grinding medium into a high-speed oscillating machine and ground for 60 minutes to obtain a high temperature resistant coating for polyimide composite material protection.

[0041] The prepared coating was sprayed on the surface of a clean polyimide composite material with a coating thickness of 100 μm, dried at room temperature for 2 hours, pretreated at 60°C for 3 hours, and cured at 180°C for 4 hours. After testing: the coating adhesion is level 1, the pull-off adhesion is 10MPa, the bonding strength between the coating and the polyimide is high; the coating and the substrate are intact after being oxidized in an air atmosphere at 500°C for 2 hours, and the coati...

Embodiment 2

[0043] Weigh 25 parts of polysilazane, polysiloxane resin, 5 parts of silicon dioxide, 10 parts of boron nitride, 10 parts of titanium dioxide, 0.2 parts of thickener, and 25 parts of xylene into the batching barrel, using high speed The mixer is pre-dispersed for 60 minutes at a speed of 600r / min, and the uniformly stirred slurry is loaded with a grinding medium into a high-speed oscillating machine and ground for 90 minutes to obtain a high temperature resistant coating for polyimide composite material protection.

[0044] The prepared coating was sprayed on the surface of a clean polyimide composite material with a coating thickness of 150 μm, dried at room temperature for 5 hours, pretreated at 100°C for 2 hours, and cured at 200°C for 2 hours. After testing: the coating has a first-level adhesion, a pull-off adhesion of 12MPa, and a high bonding strength between the coating and polyimide; the coating and the substrate are intact after being oxidized in an air atmosphere at 50...

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Abstract

The invention belongs to the technical field of materials, and relates to a high-temperature-resistant coating for polyimide composite material protection and a coating layer preparation method. The high-temperature-resistant coating is composed of a hybrid silicon resin, a temperature-resistant functional powder, an inorganic coloring pigment, a solvent, an auxiliary agent and the like. The coating layer preparation method based on the high-temperature-resistant coating comprises the following steps: a polyimide substrate is coated with the high-temperature-resistant coating in a spraying, dip-coating, blade coating, or brush coating mode, an obtained product is dried at room temperature for a certain period of time, and gradual heating is conducted for curing. The preparation process issimple and suitable for industrial production; the high-temperature coating layer prepared by the method is compact, good in oxidation resistance, high in bonding strength with the polyimide substrate, good in thermal shock resistance and excellent in environmental resistance, and can work for a long time in high-salt-mist and high-damp-heat environments.

Description

Technical field [0001] The invention belongs to the technical field of materials, and relates to a high-temperature resistant paint protected by a polyimide composite material and a coating preparation method. Background technique [0002] Polyimide resin-based composite materials have high specific strength and specific rigidity, light weight, good designability and good high temperature resistance. It is one of the important materials to replace medium and high temperature metal parts to achieve weight reduction. It is widely used in aerospace vehicles. However, with the continuous improvement of material performance requirements in the aerospace field, the lower application temperature, poor oxidation and abrasion resistance of resin-based composites have greatly restricted their further applications. Due to the complex synthesis process of the polyimide resin monomer and the serious problem of the resin curing molding process, it is very difficult to further improve the temp...

Claims

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Application Information

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IPC IPC(8): C09D183/16C09D183/04C09D7/61C08J7/04C08L79/08
CPCC08J2379/08C08J2483/16C08K2003/2241C08K2003/385C08L2201/08C08L2201/14C08L2205/02C08L2205/025C09D5/18C09D183/04C09D183/16C09D7/61C08K13/02C08K3/36C08K3/34C08K3/22C08L83/04C08K3/38C08L83/16C08K3/40
Inventor 万耀明王林豪熊瑜梁璐张玉忠
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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