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Heating solidified low density liquid silicon rubber composition and low density silicon rubber formed object

A liquid silicone rubber, heating and curing technology, applied in the field of low specific gravity liquid silicone rubber composition, can solve the problems of low true density, insufficient hardness change and damage of the storage stability of the silicone rubber composition, and achieve small hardness change, Small compression set and good storage stability

Inactive Publication Date: 2007-03-07
DOW CORNING TORAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hollow microspheres made of glass with low true density have the problem of being easily damaged during the production and molding of the silicone rubber composition.
In addition, although hollow microspheres made of glass are surface-treated with a surface treatment agent, the storage stability of the silicone rubber composition and the suppression of hardness changes after high-temperature heating of the molded product are still insufficient.

Method used

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  • Heating solidified low density liquid silicon rubber composition and low density silicon rubber formed object
  • Heating solidified low density liquid silicon rubber composition and low density silicon rubber formed object
  • Heating solidified low density liquid silicon rubber composition and low density silicon rubber formed object

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] 92 parts of trimethylsiloxy terminated methylvinylpolysiloxane / dimethylpolysiloxane copolymer (vinyl content 0.12% by weight) at both ends of the molecular chain with a viscosity of 40,000mPa·s, the viscosity 2 parts of dimethyl hydroxysilyl-terminated dimethylsiloxane oligomer at both ends of the molecular chain of 40mPa·s, the following formula (3):

[0071]

[0072] 2 parts of the organosiloxane oligomer indicated, the specific surface area of ​​the BET method treated with hexamethyldisilazane is 200m 2 3 parts / g of fumed silica, glass hollow micropowder (manufactured by Sumitomo Triem Co., Ltd.; trade name "Glass Bubbles S38", average particle diameter 40 μm, true specific gravity 0.38g / cm 3) 30 parts into a loss mixer and mixed evenly, heated and stirred at 170°C / 60 minutes under reduced pressure, and then cooled for 30 minutes to obtain a fluid liquid silicone rubber basic mixture. Next, to this liquid silicone rubber base mixture was added a two-terminal dime...

Embodiment 2

[0077] In Example 1, a liquid silicone rubber composition was produced in the same manner as in Example 1, except that 0.025 parts of cerium oxide fine powder was blended without heating and mixing when producing the liquid silicone rubber base mixture. Then, various characteristics were measured in the same manner as in Example 1. The results are shown in Table 1.

[0078] Example 1

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Abstract

To provide a heat-curable and low-specific gravity liquid silicone rubber composition excellent in storage stability and, after cured, giving a silicone rubber molded product slight in hardness change by heat and slight in compression set. The heat-curable and low-specific gravity liquid silicone rubber composition comprises (A) a liquid diorganopolysiloxane containing in one molecule at least two silicon atom-bound alkenyl groups and having a viscosity of 100-100,000 mPa.s, (B) an organopolysiloxane having in one molecule at least two silicon atom-bound hydrogen atoms, (C) a hydrosilylation catalyst, (D) glass microballoon powder, (E) a specific organopolysiloxane oligomer having silicon atom-bound alkoxysilyl group-containing organic groups, and (F) an organopolysiloxane oligomer whose molecular chain both ends are blocked with diorganohydroxysilyl groups.

Description

technical field [0001] The invention relates to a low specific gravity liquid silicone rubber composition which is heated and cured through a hydrosilylation reaction. More specifically, it relates to a composition that can be made into a silicone rubber composition that has good storage stability, small changes in hardness after curing and heating, and small compression set. A heat-curable low specific gravity liquid silicone rubber composition of a silicone rubber molded article and a low specific gravity silicone rubber molded article obtained by curing the composition. Background technique [0002] Silicone rubber with low specific gravity has low thermal conductivity, good heat resistance, weather resistance and light weight, so its characteristics are used in sealing materials; packaging materials; gaskets; O-rings; copiers, printers, fax machines, etc. It is used in a wide range of applications such as roller coating materials. In particular, applications that requir...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08K9/06C08K3/22C08K7/28
Inventor 佐久间厚冈裕辻裕一
Owner DOW CORNING TORAY CO LTD
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