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A kind of silicone rubber with excellent compressive stress relaxation performance and preparation method thereof

A compressive stress, silicone rubber technology, applied in the field of silicone rubber and its preparation, can solve the problems of low compressive stress relaxation rate, large compressive stress relaxation rate, and high price of silica, and achieves reduced dosage, simple preparation method, and operable strong effect

Active Publication Date: 2020-08-11
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High temperature vulcanized silicone rubber with white carbon black as a single filler has high tensile strength, but the compression stress relaxation rate is also large
Also, the price of silica is higher compared to calcium carbonate or modified calcium carbonate
High temperature vulcanized silicone rubber with calcium carbonate or modified calcium carbonate as a single filler has a low compressive stress relaxation rate, but low tensile strength

Method used

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  • A kind of silicone rubber with excellent compressive stress relaxation performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) In terms of parts by mass, place 100 parts of methyl vinyl silicone rubber with a vinyl molar content of 0.13% to 0.20% and a molecular weight of 450,000 to 700,000 on the roller of an open mixer, and adjust the roller Distance to 3mm, start the mixer so that the methyl vinyl silicone rubber is completely covered with rolls.

[0035] 2) Add 25 parts of fumed silica with a specific surface area of ​​200 ㎡ / g, and 3 parts of hydroxyl silicone oil with a hydroxyl content of 6% to 10% into the methyl vinyl silicone rubber that has been rolled in step 1) for mixing. refining. Among them, fumed silica and hydroxy silicone oil are added in four equal amounts, and each addition, fumed silica should be added first, and then hydroxy silicone oil should be added dropwise, so that fumed silica can be evenly mixed into methyl vinyl silicon rubber.

[0036] 3) Add 5 parts of nano-modified calcium carbonate with a specific surface area of ​​40 m2 / g and 1 part of methylphenyl silic...

Embodiment 2

[0042] 1) In terms of parts by mass, place 100 parts of methyl vinyl silicone rubber with a vinyl molar content of 0.13% to 0.20% and a molecular weight of 450,000 to 700,000 on the roller of an open mixer, and adjust the roller Distance to 3mm, start the mixer so that the methyl vinyl silicone rubber is completely covered with rolls.

[0043] 2) Add 30 parts of fumed silica with a specific surface area of ​​200㎡ / g, and 4 parts of hydroxyl silicone oil with a hydroxyl content of 6% to 10% into the methyl vinyl silicone rubber that has been rolled in step 1) for mixing. refining. Among them, fumed silica and hydroxy silicone oil are added in four equal amounts, and each addition, fumed silica should be added first, and then hydroxy silicone oil should be added dropwise, so that fumed silica can be evenly mixed into methyl vinyl silicon rubber.

[0044] 3) Add 10 parts of nano-modified calcium carbonate with a specific surface area of ​​40 m2 / g and 2 parts of methylphenyl sili...

Embodiment 3

[0050] 1) In terms of parts by mass, place 100 parts of methyl vinyl silicone rubber with a vinyl molar content of 0.13% to 0.20% and a molecular weight of 450,000 to 700,000 on the roller of an open mixer, and adjust the roller Distance to 3mm, start the mixer so that the methyl vinyl silicone rubber is completely covered with rolls.

[0051]2) Add 30 parts of fumed silica with a specific surface area of ​​200㎡ / g, and 5 parts of hydroxyl silicone oil with a hydroxyl content of 6%-10% into the methyl vinyl silicone rubber that has been rolled in step 1) for mixing. refining. Among them, fumed silica and hydroxy silicone oil are added in four equal amounts, and each addition, fumed silica should be added first, and then hydroxy silicone oil should be added dropwise, so that fumed silica can be evenly mixed into methyl vinyl silicon rubber.

[0052] 3) Add 15 parts of nano-modified calcium carbonate with a specific surface area of ​​40 m2 / g and 2 parts of methylphenyl silicone...

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Abstract

The invention discloses silicon rubber with excellent compressive stress relaxation performance and a preparing method thereof. The silicon rubber is prepared from, by mass, 100 parts of methyl vinylsilicone rubber, 20-40 parts of vapor-phased white carbon black, 5-20 parts of nanometer-modified calcium carbonate, 3-6 parts of hydroxyl silicone oil, 1-3 parts of methylphenyl silicone resin, 1 part of dicumyl peroxide and 0.5-1 part of stearic acid. According to the silicon rubber with excellent compressive stress relaxation performance, the use amount of the white carbon black is lowered, thenanometer-modified calcium carbonate and the white carbon black are matched to serve as a filler, the compressive stress relaxation performance of the silicon rubber is improved, the tensile strengthof the silicon rubber is improved, and the production cost is reduced. The preparing method is simple and high in operability. The silicon rubber with excellent compressive stress relaxation performance can be applied to sealing gaskets of fuel cells, particularly sealing gaskets for the fuel cells of new-energy vehicles.

Description

technical field [0001] The invention relates to the technical field of silicone rubber, in particular to a silicone rubber with excellent compressive stress relaxation performance and low cost and a preparation method thereof. Background technique [0002] As a typical elastomer material, silicone rubber has good flexibility, stable chemical properties, and high-temperature vulcanized silicone rubber has good compression resilience, so silicone rubber is widely used in aerospace, electronics, new Gasket materials in the fields of energy equipment, chemical industry, transportation and medical and health. Compressive stress relaxation rate is an important index to measure the sealing performance of silicone rubber sealing gasket materials. An excellent silicone rubber sealing material should have a small compressive stress relaxation rate. It is of great application value to study a silicone rubber with excellent compressive stress relaxation properties. [0003] At present...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08K3/36C08K9/06C08K3/26C08K5/14C08K13/06C09K3/10
CPCC08K2003/265C08K2201/006C08K2201/011C08L83/04C08L2203/20C08L2205/025C08L2205/03C09K3/10C08K3/36C08K9/06C08K3/26C08K5/14C08K13/06
Inventor 谈金祝尹力
Owner NANJING TECH UNIV
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