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Flexible heat-resistant ceramizable silicone rubber composite material and preparation method thereof

A technology of vitrified silicone rubber and composite materials, applied in the field of rubber materials, can solve the problems of low thermal stability, achieve good mechanical properties, easy processing and molding, and broad application prospects

Active Publication Date: 2020-03-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present invention aims to propose a flexible heat-resistant ceramizable silicone rubber composite material to solve the problem of low thermal stability of the existing ceramizable silicone rubber composite materials in the ceramization process

Method used

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  • Flexible heat-resistant ceramizable silicone rubber composite material and preparation method thereof
  • Flexible heat-resistant ceramizable silicone rubber composite material and preparation method thereof

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Embodiment 1

[0037] A flexible heat-resistant ceramizable silicone rubber composite material, comprising the following components in parts by weight: methyl vinyl silicone rubber: 100 parts, fumed white carbon black: 25 parts, titanium boride powder: 40 parts, carbonized Mixture of boron and low-melting glass powder: 20 parts, bis-pentasulfurizing agent: 2 parts. Among them, the specific gravity of boron carbide is 2.52g / cm 3 , the melting point is 2400-2500°C; the melting point of low-melting point glass powder is 400-600°C, the particle size is 4.6-5.5um, SiO 2 The content is 52.04%; the average particle size of titanium boride powder is 3-5um.

[0038] The preparation of the above-mentioned flexible heat-resistant ceramizable silicone rubber composite material specifically includes the following steps:

[0039] 1) According to the above component formula, after kneading methyl vinyl silicone rubber in a two-roll mill for 3 to 5 minutes, add fumed silica into the two-roll mill and knea...

Embodiment 2

[0055] A flexible heat-resistant ceramizable silicone rubber composite material, comprising the following components in parts by weight: methyl vinyl silicone rubber: 100 parts, fumed white carbon black: 25 parts, titanium boride powder: 40 parts, carbonized The mixture of boron and low-melting glass powder: 20 parts, the mixture of alumina fiber and chopped carbon fiber: 15 parts, bis-pentasulfurizing agent: 2 parts. Among them, the specific gravity of boron carbide is 2.52g / cm 3 , the melting point is 2400-2500°C; the melting point of low-melting point glass powder is 400-600°C, the particle size is 4.6-5.5um, SiO 2 The content is 52.04%; the average particle size of titanium boride powder is 3-5um; the diameter of chopped carbon fiber monofilament is 5-7um, the length is 1-10mm, and the density is 1-2g / cm 3 .

[0056] The preparation of the above-mentioned flexible heat-resistant ceramizable silicone rubber composite material specifically includes the following steps:

...

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Abstract

The invention provides a flexible heat-resistant ceramizable silicone rubber composite material and a preparation method thereof. The flexible heat-resistant ceramizable silicone rubber composite material comprises the following components in parts by weight: 80-120 parts of methyl vinyl silicone rubber, 20-50 parts of titanium boride powder, 10-40 parts of a fluxing agent, 0-30 parts of reinforced fibers, 10-50 parts of white carbon black and 2-8 parts of a vulcanizing agent. The flexible heat-resistant ceramizable silicone rubber composite material disclosed by the invention has good mechanical properties at medium and low temperatures; the ceramic conversion rate and the heat residual rate are relatively high at high temperature; excellent heat protection effect is achieved, wherein themass ablation rate can be as low as 0.0150 g / s <-1 > and is far lower than that of a silicone rubber composite material of a traditional formula, and the thermal residual rate at 900 DEG C is greaterthan 60% and far higher than the pyrolysis residual rate of traditional pure silicone rubber which is about 40%.

Description

technical field [0001] The invention relates to the technical field of rubber materials, in particular to a flexible heat-resistant ceramizable silicon rubber composite material and a preparation method thereof. Background technique [0002] As a new type of heat-resistant and fire-resistant material, porcelain-able polymer materials have attracted people's attention in recent years, and there are more and more related researches. Porcelainable polymer composite materials are new materials made of organic polymers as matrix materials and adding porcelain fillers, fluxes and vulcanizing agents. Compared with other high-molecular materials, silicone rubber is relatively stable under high temperature conditions, has a wide service temperature, excellent transparency and tear strength, and the silicon dioxide produced in high-temperature ablation is non-toxic, so it is used in such materials , especially in the heat protection of rocket engines, the porcelain-able silicone rubb...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08K13/04C08K7/26C08K3/38C08K3/40C08K7/06C08K7/08
CPCC08K3/38C08K3/40C08K7/06C08K7/08C08K7/26C08K13/04C08K2201/014C08L2201/08C08L83/04
Inventor 石敏先唐青秀黄志雄秦岩宋九强杨威欧芸
Owner WUHAN UNIV OF TECH
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