High temperature-resistant silicone rubber and preparation method thereof

A technology of high temperature resistant silicone rubber and silicone rubber, applied in the field of silicone rubber, can solve the problems of the decrease of the elasticity and mechanical properties of silicone rubber, the limited improvement of the high temperature resistance of silicone rubber, the influence of mechanical properties such as the hardness of silicone rubber, etc., so as to maintain the mechanical properties. , The effect of overcoming poor compatibility and good application prospects

Inactive Publication Date: 2019-11-05
FOSHAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the current research on the preparation of high-temperature resistant silicone rubber has made some progress, but the existing preparation methods still have shortcomings: metal oxides are relatively polar, poorly compatible with silicone rubber, and difficult to disperse. Adding too much will lead to a serious decline in the elasticity and mechanical properties of silicone rubber; the compatibility between silicone resin and silicone rubber is good, but the high temperature resistance of silicone rubber is limited, and the hardness and other mechanical properties of silicone rubber are also affected to a certain extent.

Method used

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  • High temperature-resistant silicone rubber and preparation method thereof
  • High temperature-resistant silicone rubber and preparation method thereof
  • High temperature-resistant silicone rubber and preparation method thereof

Examples

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Embodiment 1

[0023] Embodiment 1 A kind of preparation of high temperature resistant silicone rubber

[0024] 90 parts by mass of methyl vinyl silicone rubber (molecular weight 560,000) with 0.05 mol% vinyl content, 10 parts by mass of methyl vinyl silicone rubber (molecular weight 600,000) with 3 mol% vinyl content, 40 parts by mass of gas-phase method white carbon Black (specific surface area 260m 2 / g), 8 parts by mass of hydroxyl silicone oil (hydroxyl content 6wt%) and 0.6 parts by mass hydrogen-containing silicone oil (hydrogen content 1.2wt%) were mixed in a kneader, and kneaded at room temperature for 4h. Then heat to 150°C and continue kneading for 2h, then vacuum knead for 1h, and cool to room temperature to obtain a silicone rubber base rubber.

[0025] Add 10 parts by mass of heat-resistant additives and 2 parts by mass of 2,5-dimethyl-2,5-di-tert-butylperoxyhexane to the above-mentioned base rubber on an open mill, knead evenly, and release the sheet. Vulcanize at 165°C for ...

Embodiment 2

[0026] Embodiment 2 A kind of preparation of high temperature resistant silicone rubber

[0027] With 50 mass parts 0.07mol% vinyl content (molecular weight 600,000), 50 mass parts 0.25 mol% vinyl content (molecular weight 600,000) methyl vinyl silicone rubber, 40 mass parts fumed silica (specific surface area 260m 2 / g), 8 parts by mass of hydroxyl silicone oil (hydroxyl content 6wt%) and 0.6 parts by mass hydrogen-containing silicone oil (hydrogen content 1.2wt%) were mixed in a kneader, and kneaded at room temperature for 4h. Then heat to 150°C and continue kneading for 2h, then vacuum knead for 1h, and cool to room temperature to obtain a silicone rubber base rubber.

[0028] Add 4 parts by mass of heat-resistant additives and 2 parts by mass of 2,5-dimethyl-2,5-di-tert-butylperoxyhexane to the above-mentioned base rubber on an open mill, mix evenly, and then release the sheet. Vulcanize at 165°C for 15 minutes, and then perform two-stage vulcanization at 200°C for 4 hour...

Embodiment 3

[0029] Embodiment 3 A kind of preparation of high temperature resistant silicone rubber

[0030] With 80 mass parts 0.05mol% vinyl content (molecular weight 560,000), 20 mass parts 0.3mol% vinyl content (molecular weight 590,000) methyl vinyl silicone rubber, 40 mass parts fumed silica (specific surface area 260m 2 / g), 8 parts by mass of hydroxyl silicone oil (hydroxyl content 6wt%) and 0.6 parts by mass hydrogen-containing silicone oil (hydrogen content 1.2wt%) were mixed in a kneader, and kneaded at room temperature for 4h. Then heat to 150°C and continue kneading for 2h, then vacuum knead for 1h, and cool to room temperature to obtain a silicone rubber base rubber.

[0031] Add 20 parts by mass of heat-resistant additives and 2 parts by mass of 2,5-dimethyl-2,5-di-tert-butylperoxyhexane to the above-mentioned base rubber on an open mill, knead evenly, and release the sheet. Vulcanize at 165°C for 15 minutes, and then perform two-stage vulcanization at 200°C for 4 hours to...

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Abstract

The present disclosure provides a high temperature-resistant silicone rubber. The silicone rubber comprises methyl vinyl silicone rubber, white carbon black, hydroxy silicone oil, hydrogen-containingsilicone oil, a heatproof additive and 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane. The heatproof additive added to the high temperature-resistant silicone rubber can significantly improve the residual quality of the silicone rubber at a high temperature, overcomes the disadvantage of poor compatibility between a commonly used heatproof additive and the silicone rubber, and maintains the originalmechanical properties of the silicone rubber.

Description

technical field [0001] The disclosure belongs to the field of silicone rubber, and in particular relates to a high-temperature-resistant silicone rubber and a preparation method thereof. Background technique [0002] Silicone rubber is a special rubber with Si atoms and O atoms alternately bonded to form the molecular main chain skeleton, and various organic groups as side groups. Because of its carbon chain structure different from ordinary rubber, silicone rubber has excellent high and low temperature resistance, weather resistance, electrical insulation, anti-mold and physiological inertia. Ordinary silicone rubber can generally be used for a long time and maintain elasticity in the temperature range of -50-260°C, while the heat-resistant temperature of phenyl silicone rubber can reach 300-350°C. However, with the development of science and technology, especially in the field of aerospace, the current heat resistance of silicone rubber can no longer meet the requirements...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/04C08L83/05C08K3/36C08K5/14C08K5/544C08K9/06
CPCC08L83/04C08L2201/08C08L2205/025C08L2205/035C08K3/36C08K5/14C08K5/544C08K9/06
Inventor 陈宛涓梁兆灏潘志杰陈东初张敏樊婷邓前军李科颖
Owner FOSHAN UNIVERSITY
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