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Low-compression permanent deformation silicone rubber composition and preparation method thereof

A technology of silicone rubber composition and compression permanent deformation, which is applied in the field of silicone rubber and can solve the problems of sacrificing the physical and mechanical properties of the silicone rubber composition and losing the translucent natural color of the rubber material, etc.

Active Publication Date: 2014-04-09
ZHEJIANG XINAN CHEM INDAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The silicone rubber obtained by the method of reducing the compression set of the rubber compound disclosed in the prior art still has a relatively high compression set (177°C×22h25% compression ratio), and part of the physical and mechanical properties of the silicone rubber composition will be sacrificed. The appearance of the rubber material becomes off-white or light yellow, and loses the translucent nature of the rubber material

Method used

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  • Low-compression permanent deformation silicone rubber composition and preparation method thereof
  • Low-compression permanent deformation silicone rubber composition and preparation method thereof
  • Low-compression permanent deformation silicone rubber composition and preparation method thereof

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preparation example Construction

[0059] The invention provides a method for preparing a low compression set silicone rubber composition, comprising the following steps:

[0060] a) Mixing methyl vinyl silicone rubber, compression set regulator, structuring control agent and internal mold release agent to obtain the first mixed material, the vinyl molar content of the methyl vinyl silicone rubber is 0.09%~ 0.50%;

[0061] b) adding the reinforcing filler into the first mixed material in the step a) for 3 to 10 times, and obtaining the second mixed material after static treatment;

[0062] c) subjecting the second mixed material obtained in step b) to high-temperature banburying heat treatment to obtain a mixed material;

[0063] d) mixing the compounded material obtained in the step c) with a vulcanizing agent and a vulcanizing aid, and vulcanizing to obtain a low compression set silicone rubber composition.

[0064] The present invention mixes the methyl vinyl silicone rubber, the compression set regulator,...

Embodiment 1

[0083] 11) In terms of parts by mass, when the temperature of the kneader is 50°C, 100 parts of methyl vinyl silicone rubber with a dimethyl vinyl end cap, a molecular weight of 650,000, and a vinyl molar content of 0.09%, 40 parts The specific surface area is 175m 2 / g precipitated silica, 1.5 parts of hydroxy silicone oil with kinematic viscosity of 25cst, 0.5 part of vinyl hydroxy silicone oil with kinematic viscosity of 30cst, 0.5 part of vinyl triethoxysilane, 0.05 part of magnesium stearate, kneaded Mix evenly in the machine, and the precipitated white carbon black is added in four times, and the amount of precipitated white carbon black added each time is 35%, 30%, 20%, and 15% respectively. Leave for 4 hours.

[0084] 12) Mix the parked rubber in a kneader at 160°C for 2.5 hours, and carry out vacuum mixing for 1.0 hour during the mixing process. The vacuum degree is not higher than 200Pa to obtain a mixed rubber.

[0085] 13) Mix 100 parts of rubber compound with 0....

Embodiment 2

[0088] 21) In terms of parts by weight, when the temperature of the kneader is 65°C, 100 parts of methyl vinyl silicone rubber with a dimethyl vinyl end cap, a molecular weight of 700,000, and a vinyl molar content of 0.16%, 35 parts The specific surface area is 175m 2 / g of precipitated silica, 10 parts specific surface area is 150m 2 / g of vapor-phase precipitation method silica, 3.0 parts of diphenyl dihydroxy silicone oil, 1.0 parts of vinyl hydroxy silicone oil with a kinematic viscosity of 30cst, 0.3 parts of vinyl triethoxysilane, and 0.1 parts of stearic acid are added to the kneader Mix evenly in the medium, and the precipitated white carbon black is added in five times, and the amount of reinforcing filler added each time is 35%, 25%, 20%, 10%, and 10% respectively. Leave for 6 hours.

[0089] 22) Put the parked rubber material in the kneader at 170°C for 3.5 hours, and carry out 2.0 hours of vacuum mixing, the vacuum degree is not higher than 200Pa, to obtain the ...

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Abstract

The invention provides a low-compression permanent deformation silicone rubber composition. The low-compression permanent deformation silicone rubber composition comprises the following components in parts by weight: 100 parts of methyl vinyl silicone rubber, 20-80 parts of reinforced fillers, 1-15 parts of a structured control agent, 0.2-0.3 part of a compression permanent deformation conditioning agent, 0.05-0.5 part of an internal releasing agent, 0.3-3 parts of a vulcanizing agent and 0.1-1.5 parts of a vulcanizing auxiliary agent, wherein the mol content of vinyl of the methyl vinyl silicone rubber is 0.09%-0.50%; the reinforced fillers comprise 70wt%-100wt% of precipitation-method white carbon black and 0wt%-30wt% of gas-phase-method white carbon black; the compression permanent deformation conditioning agent is a silicon-based compound containing the vinyl. The low-compression permanent deformation silicone rubber composition provided by the invention has low compression permanent deformation and has high physical and mechanical properties and a semitransparent appearance.

Description

technical field [0001] The invention relates to the technical field of silicone rubber, in particular to a low compression set silicone rubber composition and a preparation method thereof. Background technique [0002] Silicone rubber sealing products are a kind of important rubber products related to national defense construction and economic construction in our country. They are widely used in aerospace, aviation, shipbuilding, machinery, automobile and transportation, petrochemical, pharmaceutical, food and household appliances and other industries. More widely, silicone rubber products have become basic components or important accessories in all walks of life. With the rapid development of the economy, the scarcity of resources and the enhancement of environmental awareness, higher requirements are put forward for the performance, reliability and life of silicone rubber sealing products, especially the development of the automobile industry into a pillar industry of the ...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/06C08L83/05C08K13/02C08K5/5425C08K5/5415C08K5/5445C08K3/36B29C35/02
Inventor 王伟詹学贵胡盛周汴香季旭平蔡含宙
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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