Low-compression set silicone rubber and preparation method thereof

A permanent deformation and silicone rubber technology, applied in the field of silicone rubber, can solve the problem of high compression permanent deformation of silicone rubber, achieve low compression permanent deformation, good mechanical properties, and prevent oxidation and degradation

Inactive Publication Date: 2017-07-21
JIANGSU TIANCHEN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the shortage of high compression set of silicone rubber in the prior art, to provide a silicone rubber with low compression set and its preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The preparation method of above-mentioned low compression set silicone rubber, comprises the following steps:

[0029] (1) Add methyl vinyl silicone rubber, heat-resistant additive, silane coupling agent and mold release agent into the closed rubber mixer and knead evenly;

[0030] (2) Add silica and structuring control agent to the mixture obtained in step (1) in 2 to 10 times, and knead evenly;

[0031] (3) Carry out one-stage kneading of the mixed material obtained in step (2) at a low temperature, then raise the temperature for two-stage kneading, and perform three-stage kneading and four-stage kneading at a higher temperature;

[0032] Among them, the temperature of one-stage kneading is not higher than 70 °C, and the kneading time is 20-180 min. Preferably, the temperature of the first-stage kneading in the step (3) is not higher than 60°C, the kneading time is 60-120 min, the temperature of the second-stage kneading is 90-120°C, and the kneading time is 20-180 m...

Embodiment 1

[0038] Add 100 parts of methyl vinyl silicone rubber with a molecular weight of 680,000 and a vinyl molar content of 0.12%, 2 parts of iron oxide, 0.1 part of vinyltriethoxysilane and 0.1 part of stearic acid into the closed rubber mixer , knead evenly.

[0039] Add 45 parts in 6 times to the rubber material, the specific surface area is 160 m 2 / g of precipitated silica and 3 parts of hydroxyl silicone oil, knead evenly.

[0040] The resulting compound was kneaded at 60 °C for 60 min, 110 °C for 60 min, 150 °C for 120 min, 150 °C and 0.08 MPa vacuum for 60 min. After cooling to less than 60°C, add 0.2 parts of hydrogen-containing silicone oil with a hydrogen content of 1.6%, mix well, and filter to obtain silicone rubber.

[0041] Add 0.7 parts of dicumyl peroxide to 100 parts of the above-mentioned silicone rubber, vulcanize at 175 °C for 5 minutes, and vulcanize at 200 °C for 4 hours. The obtained vulcanized silicone rubber has a Shore hardness of 51, a tensile strength o...

Embodiment 2

[0043] Add 100 parts of methyl vinyl silicone rubber with a molecular weight of 650,000 and a vinyl molar content of 0.16%, 1 part of zinc oxide, 1 part of cerium oxide, 0.2 parts of vinyltriethoxysilane and 0.2 parts of zinc stearate In a closed rubber mixer, knead evenly.

[0044] Add 32 parts in 8 times to the rubber material, the specific surface area is 250 m 2 / g of precipitated silica and 5 parts of hexamethyldisilazane, knead evenly.

[0045]Fill the rubber mixer with nitrogen positive pressure protection, knead the resulting rubber at 60 °C for 60 min, 100 °C for 120 min, and 160 °C for 60 min; close the nitrogen, and the rubber at 150 °C and 0.08 MPa vacuum Kneading at 120 min. After cooling to less than 60°C, add 0.2 parts of hydrogen-containing silicone oil with a hydrogen content of 1.6%, mix well, and filter to obtain silicone rubber.

[0046] Add 0.7 parts of dicumyl peroxide to 100 parts of the above silicone rubber, vulcanize at 175 °C for 5 minutes, and vu...

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Abstract

The invention discloses a silicone rubber technology, and particularly relates to a low-compression set silicone rubber and a preparation method thereof. The low-compression set silicone rubber comprises the following components in parts by weight: 100 parts of methyl vinyl silicone rubber, 30-70 parts of white carbon black, 2-15 parts of a structurized control agent, 0.1-5 parts of a heat-resistant auxiliary agent, 0.2-2 parts of a vulcanizing auxiliary agent, 0.2-1.5 parts of a silane coupling agent and 0.05-1 part of a demoulding agent. After the adoption of the formula and the preparation method, through reasonable cross-linking structure design and addition of the vulcanizing auxiliary agent, the slippage of a molecular chain of a polymer is reduced; through addition of the heat-resistant auxiliary agent, oxidation and degradation of the polymer at high temperature are prevented; moreover, through a multistage heating mixing process, uniform treatment and dispersion of the white carbon black are achieved; the obtained silicone rubber has relatively low compression set and relatively good mechanical properties.

Description

technical field [0001] The invention relates to a silicone rubber technology, in particular to a silicone rubber with low compression set and a preparation method thereof. Background technique [0002] During the long-term use of elastomer materials, it is inevitable that there will be irreversible deformation, which will affect the normal use of the product. Especially in the application fields involving functions such as sealing and load bearing, there are high requirements on the compression set of elastomer materials. Among many elastomer materials, silicone rubber plays an irreplaceable role in applications with harsh environments such as aerospace, food and medical care, transportation and power cables due to its excellent properties such as high and low temperature resistance, weather resistance, environmental protection, and insulation. . In these applications, the compression set of silicone rubber (especially at high temperature) becomes one of the most important...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/06C08L83/05C08K13/02C08K3/22C08K5/5425C08K5/09C08K3/36C08K5/14
CPCC08L83/04C08K2003/2213C08K2003/2224C08K2003/2272C08K2003/2296C08K2201/006C08L2201/08C08L2205/025C08L2205/03C08L2205/035C08L83/06C08K13/02C08K3/22C08K5/5425C08K5/09C08K3/36C08K5/14
Inventor 宋顺刚徐文俊耿政
Owner JIANGSU TIANCHEN NEW MATERIALS
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