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Silicone rubber sponge composition

A composition and technology of silicone rubber, applied in the field of silicone rubber sponge composition, can solve the problems of poor compression set, increased cost, low modulus and the like

Inactive Publication Date: 2008-10-08
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While these methods enable the formation of sponges by HAV, they suffer from several drawbacks compared to dimethicone, including increased cost, since the base polymers are structurally specific and have low modulus, compression set poor sex

Method used

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  • Silicone rubber sponge composition
  • Silicone rubber sponge composition
  • Silicone rubber sponge composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] To 100 parts of thermosetting silicone rubber compounds with about 30 wt% particle-reinforced silica (trade name KE-551-U, from Shin-Etsu Chemical Co., Ltd., solid rubber density 1.14), add 3 Part 1,1'-azobis (cyclohexane-1-methyl carboxylate) and 4.0 parts of azodicarbonamide as foaming agent, and add 1.0 parts and 2.0 parts of addition crosslinking agent C- 25A and C-25B as crosslinkers. The above ingredients were kneaded on a two-roll mill and formed into a 5 mm thick sheet. The sheet was heated at 230°C for 15 minutes. The sponges thus obtained were post-vulcanized or post-cured at 200° C. for 4 hours. Observe the shape of the sponge and determine its hardness (Asker C) and density (g / cm 3 , JIS K-6249).

Embodiment 2

[0074] A sponge was prepared in the same manner as in Example 1, except that 4.0 parts of dinitrosopentamethylenetetramine was used instead of 4.0 parts of azodicarbonamide as the blowing agent.

Embodiment 3

[0076] A sponge was prepared in the same manner as in Example 1, except that 4.0 parts of azodicarbonamide modified with urea and having a low decomposition temperature of 150° C. was used instead of 4.0 parts of azodicarbonamide as the blowing agent.

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Abstract

A silicone rubber sponge composition comprising (A) an organopolysiloxane, (B) a non-cyano organic azo blowing agent which is thermally decomposable to cause thickening or curing of component (A), (C) an azodicarbonamide or dinitrosopentamethylenetetramine blowing agent, and (D) a curing agent is crosslinkable and expandable with atmospheric hot air. The composition makes it possible to freely control the blowing magnification and the cell size of the resulting sponge, enabling to form a fully expanded silicone rubber sponge with crosslinked surface. The sponge free of cyano compounds is least toxic.

Description

technical field [0001] The present invention relates to a silicone rubber sponge composition for forming silicone rubber sponges useful as construction gaskets, various sponge sheets, rollers for industrial use, sponge rollers for copiers and other office machines, heat insulating sheets, and the like. Background technique [0002] Silicone rubber sponge has the inherent physical properties of silicone rubber, while also exhibiting improved properties including heat resistance, cold resistance, electrical insulation, flame retardancy, and compression set. This silicone rubber sponge is usually obtained by mixing a thermosetting silicone rubber composition with a curing agent and a foaming agent, followed by heating to foam and cure. Key factors in this sponge forming process include: efficient foaming, uniform micropore structure, smooth and non-adhesive surface and retention of the inherent physical properties of silicone rubber. [0003] Most of the processing and molding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08J9/10C08K5/21C08K3/22C08K5/00C08K5/14C08K3/04
CPCC08J2383/04C08J2201/024C08J2483/00C08G77/70C08J9/0061C08J9/0004C08J9/0066C08G77/16C08J9/102C08G77/20C08L83/04C08G77/12C08L83/00
Inventor 平林佐太央小池义明
Owner SHIN ETSU CHEM IND CO LTD