Flexible ceramizable silicone rubber thermal insulation composite material and preparation method thereof

A ceramic silicone rubber and composite material technology, which is applied in chemical instruments and methods, rubber layered products, aerospace vehicle heat protection devices, etc., can solve the problem of poor resistance to high-speed particle airflow erosion, poor integrity, and peeling of thermal insulation materials To achieve the effect of improving the anti-high-speed air erosion performance, improving the structural integrity, and preventing large-scale shedding

Pending Publication Date: 2020-10-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these published patent materials, the ceramizable silicone rubber composite materials provided all have certain shortcomings. The thermal insulation materials in the patent CN 104629374A and the patent CN 109206919A have poor resistance to high-speed particle airflow erosion. The formed ceramic protective layer is easy to peel off from the surface, causing deeper ablation, which has a deteriorating effect on maintaining the shape of the aircraft
However, in the patent CN 106433148A, complex acupuncture technology is used to bring the substrate into the fiber gap, and the preparation process is extremely complicated. Under the current technical conditions, it is still impossible to realize large-scale machine production, and the industrial application is poor, and the substrate material in the gap Low content, poor interlayer adhesion, poor integrity

Method used

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  • Flexible ceramizable silicone rubber thermal insulation composite material and preparation method thereof
  • Flexible ceramizable silicone rubber thermal insulation composite material and preparation method thereof
  • Flexible ceramizable silicone rubber thermal insulation composite material and preparation method thereof

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preparation example Construction

[0069] The specific steps of the preparation method of the flexible ceramizable silicone rubber thermal insulation composite material according to the embodiment of the present invention are as follows:

[0070] 1) Weigh the raw materials according to the proportion, for subsequent use;

[0071] 2) Put the silicone rubber into the open mill and knead it to the wrapping roller, then add fumed silica, ceramic powder, structure control agent, vulcanizing agent and mix evenly, and add fluxing agent as needed. After mixing uniformly, add short fibers. When the short fibers are chopped carbon fibers, chopped polyimide fibers or silicon carbide whiskers, add them after uniform mixing. When the short fibers are aramid pulp, add gas-phase dioxide. Silicon is added and mixed before mixing, fully mixed, and placed at room temperature for 24 hours, and then back-mixed and produced to obtain a mixed sheet;

[0072] 3) after the step 2) gained kneading sheet is cut into the same specificat...

Embodiment 1

[0075] A flexible and ceramizable silicone rubber heat-insulating composite material, the composite material is obtained by stacking and vulcanizing a kneaded sheet obtained by kneading silicone rubber and a fiber cloth, wherein the raw material components and mass parts of the kneaded sheet are: methyl 100 parts of vinyl silicone rubber, 30 parts of hydrophobic fumed silica, 30 parts of low melting point glass frit (softening point 460°C), 10 parts of graphite powder, 30 parts of zirconium silicide, 40 parts of talcum powder, 10 parts of chopped carbon fiber, 10 parts of hydroxy silicone oil, 2 parts of dicumyl peroxide. The fiber cloth used in the composite material is a carbon fiber mesh cloth (the side length of the mesh is 1 mm, and the thickness of the fiber cloth is 0.24 mm), and the number of stacked layers is 5 layers.

Embodiment 2

[0077] A flexible and ceramizable silicone rubber heat-insulating composite material, the composite material is obtained by stacking and vulcanizing a kneaded sheet obtained by kneading silicone rubber and a fiber cloth, wherein the raw material components and mass parts of the kneaded sheet are: methyl 100 parts of vinyl silicone rubber, 30 parts of hydrophobic fumed silica, 30 parts of low melting point glass frit (softening point 560°C), 40 parts of graphite powder, 60 parts of aluminum hydroxide, 30 parts of kaolin, 10 parts of zirconium carbide, short 15 parts of cut carbon fibers, 15 parts of hydroxy silicone oil, and 4 parts of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane. The fiber cloth used in the composite material is a carbon fiber mesh cloth (the side length of the mesh is 1 mm, and the thickness of the fiber cloth is 0.24 mm), and the number of stacked layers is 5 layers.

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Abstract

The invention relates to a flexible ceramizable silicone rubber thermal insulation composite material and a preparation method thereof. The composite material is a silicone rubber / fiber cloth integralstructure, the silicone rubber is a support structure, and the fiber cloth penetrates through the silicone rubber; the composite material is obtained by stacking and vulcanizing mixed rubber sheets and fiber cloth at intervals, the mixed rubber sheets are obtained by mixing the silicone rubber, and the mixed rubber sheets are prepared from, by mass, 100 parts of the silicone rubber, 20-45 parts of fumed silica, 30-160 parts of ceramic powder, 0-40 parts of a fluxing agent, 6-20 parts of short fibers, 1-15 parts of a structure control agent and 1-4 parts of a vulcanizing agent. The ceramizablesilicone rubber composite material provided by the invention is good in flexibility, high in mechanical property, good in ablation resistance and resistant to high-speed airflow scouring, and can meet the requirements of the fields of aerospace and special fireproof engineering on fireproof, thermal-insulating and ablation-resistant thermal protection performance.

Description

technical field [0001] The invention belongs to the technical field of organic macromolecular compounds, and relates to a flexible and ceramizable silicone rubber heat-insulating composite material and a preparation method thereof. Background technique [0002] The rapid development of aerospace vehicles has higher and higher requirements for thermal protection materials. Among the current thermal protection materials, polymer-based composite materials have more obvious advantages than ceramic-based thermal-protective materials and metal-based thermal-protective materials under certain special operating conditions. The ceramizable polymer composite materials gradually developed in the field of thermal protection combine the characteristics of low density, high specific strength and low thermal conductivity of polymers at room temperature and the high temperature advantages of ceramic materials, so that they can be used in different service conditions. Playing different role...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B25/20B32B25/10B32B9/00B32B9/04B32B7/10B32B37/06B32B37/10C08L83/07C08L83/04C08L77/10C08L79/08C08K13/04C08K7/10C08K7/06C08K3/36C08K3/04C08K3/34C08K3/22C08K3/40C08K5/14B64C1/38B64G1/58B29C70/34
CPCB32B25/20B32B25/10B32B7/10B32B5/028B32B37/06B32B37/10C08L83/04B64C1/38B64G1/58B29C70/34C08L2201/02C08L2201/08C08L2205/025C08L2205/16C08L2205/035C08K2003/2227C08K2003/2244B32B2262/10B32B2262/106B32B2307/306B32B2307/54B32B2307/3065B32B2307/304B32B2605/18C08L77/10C08L79/08C08K13/04C08K3/36C08K3/40C08K3/04C08K3/34C08K7/06C08K5/14C08K3/22C08K3/346C08K7/10Y02T50/40
Inventor 黄志雄宋九强秦岩石敏先朱笛邹镇岳
Owner WUHAN UNIV OF TECH
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