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Millable silicone rubber composition, millable silicone rubber sponge, and method for producing said sponge

一种硅橡胶组合物、制造方法的技术，应用在建筑物构造、胶粘剂、门/窗的特殊设备等方向，能够解决硅橡胶海绵物性恶化等问题，达到尺寸精度优异的效果

Active Publication Date: 2019-04-02
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the method of using the above-mentioned crosslinking agent and continuous foaming agent is also related to the deterioration of the physical properties of the silicone rubber sponge

Method used

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  • Millable silicone rubber composition, millable silicone rubber sponge, and method for producing said sponge
  • Millable silicone rubber composition, millable silicone rubber sponge, and method for producing said sponge
  • Millable silicone rubber composition, millable silicone rubber sponge, and method for producing said sponge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0212] With respect to 145 parts by mass of base composition 1, add (C1) 3.0 parts by mass of heat-expandable microcapsules, 2,5-dimethyl-2,5-di-(t-butyl peroxide) as a curing agent (D1) ) 1.5 parts by mass of hexane and 7.0 parts by mass of azodicarbonamide (theoretical gas generation 1400cc) of the continuous foaming agent (E1), and then mixed with a two-roll mill to produce a 9mm thick uncrosslinked rubber combination object piece.

[0213] Next, the uncrosslinked rubber composition sheet with a thickness of 9 mm was subjected to hot air crosslinking under normal pressure in a hot air drier at 230° C. for 30 minutes to obtain a silicone rubber sponge.

[0214] Thereafter, the obtained silicone rubber sponge was post-cured at 230° C. for 2 hours. The state of the pores of the obtained sponge was confirmed / evaluated as above, and the hardness of the sponge, the expansion ratio, the average pore diameter, the aspect ratio of the pores (sphericality) and continuous foam were i...

Embodiment 2

[0217] With respect to 145 mass parts base composition 1, add 2.3 mass parts (C2) heat-expandable microcapsules, 1.2 mass parts as the dicumyl peroxide of curing agent (D2) and 3.5 mass parts as continuous foaming agent (E2) Azodicarbonamide (theoretical gas generation amount: 690 cc) containing urea was mixed with a two-roll mill, and a sponge was produced in the same manner as in Example 1. Thereafter, in the same manner as in Example 1, the evaluation results of the sponge are shown in Table 2.

Embodiment 3

[0219] With respect to 145 parts by mass of base composition 1, add 3.0 parts by mass (C3) of thermally expandable microcapsules, 1.8 parts by mass of tert-butyl peroxide as a curing agent (D3) and 4.5 parts by mass as a continuous foaming agent N,N'-dinitrosopentamethylenetetramine (theoretical gas generation amount: 1100 cc) of (E3) was further mixed with a two-roll mill, and a sponge was produced in the same manner as in Example 1. Thereafter, in the same manner as in Example 1, the evaluation results of the sponge are shown in Table 2.

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PUM

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Abstract

Provided are a millable silicone rubber composition, a millable silicone rubber sponge, and a method for producing said sponge. A method for producing a millable silicone rubber sponge having an opencell content of 20% or higher that heat treats at 200 DEG C or higher a silicone rubber composition of components (A)-(E): (A) organopolysiloxane having a degree of polymerization of 3000 or higher and having at least two alkenyl groups per molecule represented by the average compositional formula (I): R1 aSiO4-a / 2 [in the formula, R1 represent the same or different monovalent hydrocarbon groups and a represents a positive number of 1.95-2.04], (B) reinforcing silica, (C) thermally expandable microcapsules having an expansion start temperature of 90-150 DEG C that shrink 20% or more from the maximum expansion volume by heating for five minutes at 200 DEG C, (D) curing agent: organic peroxide, and (E) open cell-forming agent: solid high temperature decomposition-type organic foaming agent having a decomposition start temperature of 180 DEG C or higher, that contains a component that begins to decompose after curing of component (A) .

Description

technical field [0001] The present invention relates to a kneading type silicone rubber composition, a kneading type silicone rubber sponge, and a method for producing the sponge by continuous foaming. Background technique [0002] The silicone rubber sponge is a sponge having excellent physical properties such as heat resistance, cold resistance, electrical insulation, and flame retardancy peculiar to silicone rubber, and has excellent physical properties such as small compression set. In order to promote low heat conduction and light weight, silicone rubber sponges with such characteristics are used in OA equipment, automobiles, and construction materials. [0003] Silicone rubber sponges are manufactured by various methods, such as molding / crosslinking methods and foaming methods of silicone rubber, depending on the application. As one of the foaming methods, there is a method of mixing heat-expandable resin particles (heat-expandable microcapsules) enclosed in a solvent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/04C08J9/06C08K3/36C08K5/14C08L83/07
CPCC08J9/04C08J9/06C08J9/0066C08J9/0028C08J2201/026C08J2383/07C08G77/20C08K3/36C08K5/14C09J183/04C08J9/32C08J2203/22C08J9/38C08J9/103C08J2201/034C08L83/04C08G77/70C08J9/0023C08J9/10C08K9/10C08J7/08C08J9/106C08J2205/05C08K5/20C08K5/3467E06B7/2314
Inventor 平林佐太央
Owner SHIN ETSU CHEM CO LTD
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