Mixing silicon rubber composition for anti-dynamic fatigue key

A technology of mixing silicone rubber and dynamic fatigue, which is applied in the field of rubber, can solve problems such as current conduction obstacles, achieve the effect of improving processability and avoiding current conduction obstacles

Inactive Publication Date: 2013-01-23
滁州天成有机硅高分子材料有限公司
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Problems solved by technology

Traditional silicone rubber keys will seep out low-molecular cyclosiloxane when they are

Method used

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Example Embodiment

[0008] In order to make it easy to understand the technical means, creative features, goals and effects achieved by the present invention, the present invention will be further explained in conjunction with specific embodiments below.

[0009] In order to produce mixed silicone rubber for keys with good dynamic fatigue resistance, a dihydroxysiloxane with a kinematic viscosity of 10000~100000m㎡㎡ / s can be mixed with methyl vinyl silicone rubber raw rubber. Improve the processability of mixed silicone rubber.

[0010] In 70 parts of methyl vinyl silicone rubber raw rubber, 30 parts of a, w dihydroxy polydimethylsiloxane with a viscosity of 45000 m㎡ / s and 2.5 parts of a, w one with a kinematic viscosity of 90 m㎡ / s are added Dihydroxy polydimethylsiloxane, 45 parts of precipitation white carbon black, 0.05 parts of zinc stearate, kneaded uniformly in a kneader; kneaded at 150°C for 3 hours to form a rubber compound. The rubber compound was mixed with 0.2 part of double-two five on a t...

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Abstract

The invention discloses a mixing silicon rubber composition for an anti-dynamic fatigue key and relates to the technical field of rubber. The composition is characterized by consisting of the following components in part by mass: 50 to 80 parts of methyl vinyl silicone rubber crude rubber, 20 to 40 parts of alpha, omega-dihydroxyl polydimethyl siloxane of which the kinematic viscosity is 45,000m m<2>/s, 1 to 3 parts of alpha, omega-dihydroxydimethylpolysiloxane of which the kinematic viscosity is 90m m<2>/s, 20 to 50 parts of white carbon black, 0.1 to 0.5 part of 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane, and 0.01 to 1 part of zinc stearate. By adding dihydroxyl siloxane, the processability of the mixing silicon rubber is improved, and low-molecular-weight cyclosiloxane cannot be oozed after the silicon rubber key is used repeatedly, so that the current conduction obstacles on a part of a pressed point can be avoided.

Description

technical field [0001] The invention relates to the technical field of rubber, in particular to a mixing silicone rubber composition for dynamic fatigue-resistant keys. Background technique [0002] Silicone rubber (English name Silicone rubber) can be divided into thermal vulcanization type (high temperature vulcanization silicone HTV) and room temperature vulcanization type (RTV). The room temperature vulcanization type is divided into polycondensation reaction type and addition reaction type. High temperature silicone rubber is mainly used to manufacture various silicone rubber products, while room temperature silicone rubber is mainly used as adhesive, potting material or mold. The thermal vulcanization type is used in the largest amount, and the thermal vulcanization type is divided into methyl silicone rubber, methyl vinyl silicone rubber, methyl vinyl phenyl silicone rubber, and other silicone rubber and fluorosilicone rubber. Among many synthetic rubbers, silicone r...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/06C08K3/36C08K5/098C08K5/14
Inventor 张青
Owner 滁州天成有机硅高分子材料有限公司
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