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Composite silicon rubber and preparation method thereof

A composite silicone rubber and rubber technology, which is applied in the field of composite silicone rubber, can solve the problems of low strength, poor compression set performance, easy to fly around, etc., and achieve the effect of purifying the environment, reducing the amount of compression set, and reducing production costs

Active Publication Date: 2013-05-22
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the strength of raw silicone rubber itself is very low, and a reinforcing agent needs to be added during processing to increase its strength. At present, fumed silica is mainly used as a reinforcing agent for silicone rubber at home and abroad, but There are two obvious deficiencies. One is that fumed silica is expensive, and the particles of fumed silica are extremely fine, which are easy to fly around during the mixing process of silicone rubber, causing great pollution to the production environment, thus limiting Second, although the silicone rubber reinforced by fumed silica has high strength, its compression set performance is poor, generally 30-50%, which limits the use of silicone rubber in compression sealing products. field application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The composite silicone rubber of this embodiment is composed of the following parts by weight: 95 parts of low vinyl content methyl vinyl silicone rubber, 5 parts of high vinyl content methyl vinyl silicone rubber, 30 parts of reinforcing agent, Structure control agent-2 parts of hydroxy silicone oil, vulcanizing agent-0.5 part of benzoyl peroxide; the vinyl content of low vinyl content methyl vinyl silicone rubber is 0.05%, and the molecular weight is 550,000; high vinyl content methyl Vinyl silicone rubber has a vinyl content of 0.5% and a molecular weight of 550,000; the reinforcing agent is composed of 90wt% precipitated white carbon black and 10wt% gas phase white carbon black, wherein the precipitated white carbon black is particle surface treatment After the high specific surface area white carbon black, its specific surface area is 150m 2 / g.

[0021] The composite silicone rubber of this embodiment is prepared by the following steps:

[0022] 1) When the temperatur...

Embodiment 2

[0026] The composite silicone rubber of this embodiment is composed of the following parts by weight: 97 parts of low vinyl content methyl vinyl silicone rubber, 3 parts of high vinyl content methyl vinyl silicone rubber, 40 parts of reinforcing agent, Structural controller-4 parts of diphenyl silicone glycol, vulcanizing agent-0.75 parts of dicumyl peroxide; among them, the vinyl content of low vinyl content methyl vinyl silicone rubber is 0.12%, and the molecular weight is 650,000; Vinyl content methyl vinyl silicone rubber has a vinyl content of 1.8% and a molecular weight of 650,000; the reinforcing agent is composed of 75wt% precipitated white carbon black and 25wt% gas phase white carbon black, wherein the precipitated white carbon Black is a high specific surface area silica after particle surface treatment, and its specific surface area is 250m 2 / g.

[0027] The composite silicone rubber of this embodiment is prepared by the following steps:

[0028] 1) When the temperatu...

Embodiment 3

[0032] The composite silicone rubber of this embodiment is composed of the following parts by weight: 99.5 parts of low vinyl content methyl vinyl silicone rubber, 0.5 parts of high vinyl content methyl vinyl silicone rubber, 50 parts of reinforcing agent, Structure control agent-any ratio of methyl phenyl diethoxy silane and 6 parts of tetramethyl ethylene dioxy dimethyl silane, vulcanizing agent-any ratio of 2,5-dimethyl-2,5-di 1 part of tert-butyl hexane peroxide and tert-butyl perbenzoate; among them, the vinyl content of low vinyl content methyl vinyl silicone rubber is 0.18%, and the molecular weight is 700,000; high vinyl content methyl vinyl silicone The vinyl content of the rubber is 3% and the molecular weight is 700,000; the reinforcing agent is precipitated white carbon black, wherein the precipitated white carbon black is a high specific surface area white carbon black after particle surface treatment, and its specific surface area is 300m 2 / g.

[0033] The composit...

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Abstract

The invention discloses a composite silicon rubber and a preparation method thereof. The composite silicon rubber comprises the following components in parts by weight: 95-99.5 parts of low-vinyl-content methyl vinyl silicon rubber, 0.5-5 parts of high-vinyl-content methyl vinyl silicon rubber, 30-55 parts of reinforcing agent, 2-6 parts of structure control agent and 0.5-1 part of vulcanizer, wherein the content of the vinyl in the low-vinyl-content methyl vinyl silicon rubber is 0.05-0.18%; the content of the vinyl in the high-vinyl-content methyl vinyl silicon rubber is 0.5-3%; and the reinforcing agent consists of 50-100wt% of precipitate white carbon black and 0-50wt% of gas phase white carbon black. The composite silicon rubber and the preparation method have the following beneficial effects: two methyl vinyl silicon rubbers with different vinyl contents are used; the precipitate white carbon black is used for replacing the gas phase white carbon black, thus the compression set of the silicon rubber is greatly reduced on the premise of ensuring that the strength of the silicon rubber is basically unchanged; and the obtained composite silicon rubber is applicable in the fieldof compressive sealing articles.

Description

technical field [0001] The invention relates to a composite silicone rubber, and also relates to a preparation method of the composite silicone rubber. Background technique [0002] Silicone rubber has excellent high and low temperature resistance, weather resistance, water repellency, electrical insulation and other unique properties and a very wide operating temperature range. Silicone rubber has become an indispensable and important material in modern high-tech fields including aerospace, aviation, navigation, national defense, electronic appliances, transportation, medical and health, and human daily life. [0003] However, the strength of raw silicone rubber itself is very low, and a reinforcing agent needs to be added during processing to increase its strength. At present, fumed silica is mainly used as a reinforcing agent for silicone rubber at home and abroad, but the reinforcing agent of fumed silica There are two obvious deficiencies. One is that fumed silica is e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08K13/06C08K3/36C08K5/14
Inventor 史鸿威袁端磊陈延辉宋晓光王春生
Owner STATE GRID CORP OF CHINA