Silicone rubber composition
A silicone rubber composition and silicon atom bonding technology, which can be used in building components, coatings, fire protection, etc., and can solve problems such as peeling off, difficult mixing operations, and flame spread
Active Publication Date: 2016-03-30
SHIN ETSU CHEM IND CO LTD
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Problems solved by technology
However, this method has the following disadvantages: cracking occurs in a high-level fire resistance test such as a 3-hour fire resistance test, the flame spreads, and if it is exposed to a flame for a long time, it burns and becomes brittle, and the seam is broken due to a small external stress. Peel off
However, since these silicone rubbers contain a large amount of fillers, there is a problem that the roll adhesion is deteriorated and the kneading operation is very difficult.
Method used
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Embodiment 1
[0060] 99.825 mol% of dimethylsiloxane units, 0.15 mol% of methylvinylsiloxane units, and 0.025 mol of dimethylvinylsiloxy units as siloxy units capping both ends of the molecular chain %Composition, 100 parts of linear dimethyl polysiloxane raw rubber with an average degree of polymerization of about 7,000, specific surface area (BET method) 200m 2 45 parts / g of fumed silica (Erosil-200 (manufactured by Japan Aerosil Co., Ltd.)), linear dimethylpolysiloxane having a silanol group at both ends of the molecular chain and a degree of polymerization of 10 10 Parts were mixed with a kneader, and heat-treated at 150° C. for 2 hours to prepare a silicone rubber compound.
[0061] 40 parts of calcined mica (manufactured by Repco Corporation, average particle size: 18 μm) produced by calcining pulverized muscovite was added to the obtained rubber compound with twin rolls, and an alcoholic solution of chloroplatinic acid (Pt concentration 2 % by mass) 0.1 part, followed by adding 1.3 ...
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Abstract
The present invention relates to a silicone rubber composition comprising: (A) 100 parts by mass of an organopolysiloxane that has a degree of polymerization of 100 or more and contains at least two alkenyl groups each bound to a silicon atom in the molecule; (B) 10 to 100 parts by mass of a reinforcing silica having a specific surface area (BET method) of 50 m2 / g or more; (C) 1 to 100 parts by mass of calcined mica having an average particle diameter of 20 [mu]m or less; and (D) an effective amount of a curing agent. According to the present invention, even when a silicone rubber molded article is exposed to flame for a long time, ash of the silicone rubber molded article after firing is sintered (is transformed into a ceramic material) and the shape of the silicone rubber molded article before the firing (sintering) can be maintained. In addition, the rolling properties (workability) in a kneading step in the production of the silicone rubber composition are excellent.
Description
technical field [0001] The present invention relates to a silicone rubber composition which provides a cured product excellent in fire resistance (sinterability after combustion) and excellent in roll workability during kneading. Background technique [0002] In the past, as refractory materials for construction, products molded with rubber materials such as chloroprene rubber and ethylene-propylene-diene rubber have been used, but these rubber materials are gradually becoming unavailable as the service life of buildings increases. Thoroughly respond to the increasing requirements of rubber materials such as weather resistance, creep resistance, and prevention of harmful gas generation during combustion. Therefore, in recent years, refractory materials made of silicone rubber excellent in heat and weather resistance and creep resistance have gradually begun to be used as refractory materials for construction. [0003] However, if conventional silicone gaskets are exposed to...
Claims
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IPC IPC(8): C08L83/07C08K3/34C08K3/36C09K3/10E04B1/94
CPCC08K3/34C08K3/36C08K5/0025C08K5/14C08K5/56F16J15/102C09D183/04C09K3/1018C08L83/04C08K9/06F16J15/022
Inventor 林田修堀田昌克小池义明鹿岛敦人
Owner SHIN ETSU CHEM IND CO LTD