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Kneadable silicone rubber composition and cured product thereof

A technology of silicone rubber composition and cured product, which is applied in the field of silicone rubber composition and its cured product, can solve problems such as pollution, and achieve the effect of reducing the surface friction coefficient

Active Publication Date: 2018-11-23
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in these oil-separating materials, since the oil components ooze out to the surface, the oil may migrate to other materials and cause contamination.

Method used

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  • Kneadable silicone rubber composition and cured product thereof
  • Kneadable silicone rubber composition and cured product thereof
  • Kneadable silicone rubber composition and cured product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] Add 90 parts by mass of organopolysiloxane raw rubber consisting of 99.975 mol% of dimethylsiloxane units and 0.025 mol% of dimethylvinylsiloxy units and having an average degree of polymerization of about 6,000. 10 parts by mass of organopolysiloxane raw rubber consisting of 90.000 mol% of oxane units, 9.975 mol% of methylvinylsiloxane units, and 0.025 mol% of dimethylvinylsiloxy units, and having an average degree of polymerization of about 6,000 , BET method specific surface area is 200m 2 20 parts by mass per g of fumed silica (Aerosil 200, manufactured by Japan Aerosil Co., Ltd.), as a dispersant, a dihydrosilane having a silanol group at both ends, an average degree of polymerization of 4, and a viscosity of 15 mPa·s at 25° C. 3 parts by mass of methylpolysiloxane were heated at 170° C. for 2 hours while mixing with a kneader, and a base rubber compound (1) was prepared.

[0112] With respect to 100 parts by mass of the base compound (1) above, as a crosslinking ...

Embodiment 2

[0114] Add 90 parts by mass of organopolysiloxane raw rubber consisting of 99.975 mol% of dimethylsiloxane units and 0.025 mol% of dimethylvinylsiloxy units and having an average degree of polymerization of about 6,000. 10 parts by mass of organopolysiloxane raw rubber consisting of 90.000 mol% of oxane units, 9.975 mol% of methylvinylsiloxane units, and 0.025 mol% of dimethylvinylsiloxy units, and having an average degree of polymerization of about 6,000 , BET method specific surface area is 200m 2 / g of 35 parts by mass of fumed silica (Aerosil 200, produced by Japan Aerosil Co., Ltd.), as a dispersant, a dihydrosilane having a silanol group at both ends, an average degree of polymerization of 4, and a viscosity of 15 mPa·s at 25° C. 5.2 parts by mass of methylpolysiloxane were heated at 170° C. for 2 hours while mixing with a kneader, and a base rubber compound (2) was prepared.

[0115] With respect to 100 parts by mass of the base compound (2) above, as a crosslinking ag...

Embodiment 3

[0117] Add 90 parts by mass of organopolysiloxane raw rubber consisting of 99.975 mol% of dimethylsiloxane units and 0.025 mol% of dimethylvinylsiloxy units and having an average degree of polymerization of about 6,000. 10 parts by mass of organopolysiloxane raw rubber consisting of 90.000 mol% of oxane units, 9.975 mol% of methylvinylsiloxane units, and 0.025 mol% of dimethylvinylsiloxy units, and having an average degree of polymerization of about 6,000 , BET method specific surface area is 200m 2 / g of 55 parts by mass of fumed silica (Aerosil 200, manufactured by Japan Aerosil Co., Ltd.), as a dispersant, a dihydrosilane having a silanol group at both ends, an average degree of polymerization of 4, and a viscosity of 15 mPa·s at 25° C. 8.3 parts by mass of methylpolysiloxane were heated at 170° C. for 2 hours while mixing with a kneader, and a base rubber compound (3) was prepared.

[0118] With respect to 100 parts by mass of the base compound (3) above, as a crosslinkin...

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Abstract

The invention provides a mixing-type silicone rubber composition which can lower a surface friction coefficient of a silicone rubber cured product without addition of low-viscosity polymers with low compatibility and without polymers containing alkenyls. The mixing-type silicone rubber composition comprises: (A) organopolysiloxane with a polymerization degree of being above 100, comprising at least two aliphatic unsaturated groups for each molecule and comprising less than 0.2mol% of siloxane units comprising aliphatic unsaturated groups relative to all the siloxane units in the molecule; (B) organopolysiloxane with a polymerization degree of being above 100, comprising at least two aliphatic unsaturated groups for each molecule and comprising at least 6.0 mol% of siloxane units comprising aliphatic unsaturated groups relative to all the siloxane units in the molecule; (C) reinforced silicon dioxide; (D) curing agents. A silicone rubber cured product with a dynamic friction coefficient of being below 0.4 measured according to ASTM D1894 is given.

Description

technical field [0001] The present invention relates to a silicone rubber composition and a cured product thereof in which a silicone rubber having a low surface friction coefficient is imparted to a cured silicone rubber product (molded product) obtained when a kneadable silicone rubber composition is cured. Background technique [0002] Silicone rubber is widely used in various fields including electrical equipment, automobiles, construction, medical care, and food due to its excellent weather resistance, electrical properties, low compression set, heat resistance, and cold resistance. For example, rubber contacts used as rubber contacts of remote controls, typewriters, word processors, computer terminals, musical instruments, etc.; gaskets for construction; rollers for copiers, developing rollers, transfer rollers, charging rollers, paper feeders, etc. Various types of rollers such as rollers; anti-vibration rubber for audio equipment, etc.; CD gaskets used in computers, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08L83/05C08L83/04C08K13/02C08K3/36C08K5/14
Inventor 轰大地
Owner SHIN ETSU CHEM IND CO LTD