High-tearing-intensity high-temperature vulcanized silicon rubber, and preparation method and application thereof

A high-tear strength, high-temperature vulcanization technology is applied in the field of vulcanized silicone rubber to achieve the effect of improving tear strength, simple production process, and widening application range

Active Publication Date: 2017-04-26
GUANGZHOU BAIYUN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no silicone rubber with high tear strength prepared by a system using general-purpose peroxide as a vulcanizing agent. Therefore, improving the tear strength of silicone rubber with a general-purpose vulcanization system is the key to expanding the application field of silicone rubber.

Method used

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  • High-tearing-intensity high-temperature vulcanized silicon rubber, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Add 8 parts of α,ω-dihydroxy polydimethylsiloxane (viscosity: 30mPa. s), 50 parts of fumed silica (specific surface area: 300m 2 / g), fully kneaded in a kneader for 2 hours (room temperature), then kneaded at 170°C for 4 hours under normal pressure; finally at 170°C, kneaded for 2 hours under vacuum-0.1MPa conditions, and obtained For rubber compound I containing vulcanizing agent, place the rubber compound I at room temperature for 24 hours, then cool to room temperature for use.

[0070] Add 0.5 part of triallyl isocyanurate to 100 parts of rubber compound I, and knead at 150°C for 1 hour to prepare compound rubber II containing additives, and cool the compound rubber II to room temperature stand-by. Add 0.5 parts of vulcanizing agent bis(2,4-dichlorobenzoyl peroxide) to the rubber compound II, and mix it on a two-roll mill for 5 times to prepare the rubber compound III containing the vulcanizing agent.

[0071] Feed the mixed rubber III containing vulcanizing agen...

Embodiment 2

[0074] In 100 parts of methyl vinyl silicone rubber raw rubber (vinyl mole fraction: 0.08%, average molecular weight: about 800,000), add 6 parts of diphenylsilanediol, 55 parts of fumed silica (specific surface area: 150m 2 / g), fully kneaded for 2 hours (room temperature) in a kneader, then kneaded for 4 hours at 180°C under normal pressure conditions; finally kneaded for 2 hours at 180°C under vacuum-0.1MPa conditions, and obtained For rubber compound IV containing vulcanizing agent, place the rubber compound IV at room temperature for 24 hours, and cool to room temperature for use.

[0075] Add 3 parts of tetramethyltetravinyl cyclotetrasiloxane and 3 parts of vulcanizing agent benzoyl peroxide to 100 parts of rubber compound IV, and mix Botong 5 times on a double-roller mill to obtain a vulcanized Agent compound V.

[0076] Feed the mixed rubber V containing vulcanizing agent into the rubber strainer to obtain a mixed rubber material with a diameter of 4 cm, feed the mi...

Embodiment 3

[0079] In 100 parts of methyl vinyl silicone rubber raw rubber (vinyl mole fraction: 0.25%, average molecular weight: about 500,000), add 10 parts of dihydrocarbyl dialkoxysilane, 40 parts of fumed silica (specific surface area : 300m 2 / g), 10 parts of precipitated silica (specific surface area: 150m 2 / g), 3 parts diatomite (specific surface area: 10m 2 / g) Fully knead in a kneader for 2 hours (at room temperature), then knead at 170°C for 4 hours under normal pressure; finally knead at 170°C for 2 hours under vacuum-0.1MPa to obtain Vulcanizing agent compound VI, place the compound VI at room temperature for 24 hours, cool to room temperature for use.

[0080] Add 1 part of ethoxylated trimethylolpropane triacrylate, 1.5 parts of tert-butyl peroxybenzoate and 0.5 part of benzoyl peroxide to 100 parts of rubber compound VI, and mix thin pass on a double-roller mill. 5 times, the mixed rubber VII containing vulcanizing agent was obtained.

[0081] Feed the mixed rubber VI...

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Abstract

The invention relates to high-tearing-intensity high-temperature vulcanized silicon rubber, and a preparation method and application thereof. Preparation raw materials of the high-tearing-intensity high-temperature vulcanized silicon rubber comprise the following ingredients including vulcanizing-agent-free mixing materials, polyvinyl cross linking auxiliary agents and vulcanizing agents; the vulcanizing-agent-free mixing materials comprise the following ingredients including methyl vinyl silicon rubber raw rubber, filling materials and structuring prevention agents; the polyvinyl cross linking auxiliary agents are selected from at least one from triallyl isocyanurate, tetravinyl tetramethylcyelo tetrasiloxane, ethoxylated trimethylolhexane triacylate, ethoxylated pentaerythritol Tetraacrylate, ditrimethylolpropane acrylate, propoxylated pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, propoxylated glyceryl triacrylate, pentaerythritol tetraacrylate, tri(trimethylolpropane) tetraacrylate, propoxylated tri(trimethylolpropane) tetraacrylate and triallyl cyanurate.

Description

technical field [0001] The invention relates to the field of vulcanized silicone rubber, in particular to a high-tear strength type high-temperature vulcanized silicone rubber and its preparation method and application. Background technique [0002] High-temperature vulcanized silicone rubber has excellent properties such as high and low temperature resistance, weather resistance, ozone resistance and elasticity, and can better meet the high performance requirements of rubber products for excellent sealing and good durability, so it has a very broad application However, the tear strength of high temperature vulcanized silicone rubber is low, which is one of the main reasons hindering its wide application. The vulcanization system of high temperature vulcanized silicone rubber is divided into platinum catalyzed vulcanization system, special peroxide vulcanization system and general peroxide vulcanization system, among which platinum catalyzed vulcanization system and special ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/06C08K3/36C08K5/3492C08K5/14C08K13/02C08K5/5419C08K5/549C08K3/34C08K5/103C08K5/544B29B7/00B29C35/02
CPCB29B7/002B29C35/02C08K3/34C08K3/36C08K5/103C08K5/14C08K5/5419C08K5/549C08K13/02C08K2201/006C08K2201/014C08L83/04C08L2205/02C08L2312/00C08L83/06C08K5/34924C08K5/544
Inventor 蒋坤陈建军饶友黄恒超
Owner GUANGZHOU BAIYUN CHEM IND
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