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Silicone rubber composition, production method therefor, and silicone rubber extrudate

A technology of silicone rubber composition and manufacturing method, which is applied in the field of mixing-type silicone rubber composition, silicone rubber composition, its manufacturing method and silicone rubber extruded products, which can solve the problems of cost increase and achieve extrusion Improved moldability and excellent blocking resistance

Active Publication Date: 2018-08-31
MOMENTIVE PERFORMANCE MATERIALS JAPAN LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the reduction of low-molecular-weight siloxane has been demanded, but since it is difficult to remove low-molecular-weight siloxane from the raw rubber-like base polymer, it is necessary to post-cure the cured molded product at high temperature, which inevitably increases the cost

Method used

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  • Silicone rubber composition, production method therefor, and silicone rubber extrudate
  • Silicone rubber composition, production method therefor, and silicone rubber extrudate
  • Silicone rubber composition, production method therefor, and silicone rubber extrudate

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Embodiment

[0197] Hereinafter, examples of the present invention are described, but the present invention is not limited to these examples.

[0198] In the following examples and comparative examples, the following polyorganosiloxanes were used as (A1) component, (A2) component, and (D21) component. In addition, the siloxane unit is described as the unit shown by the following symbol.

[0199] M unit: (CH 3 ) 3 SiO 1 / 2 -

[0200] m Vi Unit: (CH 3 ) 2 (CH 2 =CH)SiO 1 / 2 -

[0201] m OH Unit: (CH 3 ) 2 (OH)SiO 1 / 2 -

[0202] Unit D: -(CH 3 ) 2 SiO-

[0203] D. H Unit: -(CH 3 )HSiO-

[0204] D. Vi Unit: -(CH 3 )(CH 2 =CH)SiO-

[0205] As the polyorganosiloxane diol of the component (A1) and the polyorganosiloxane of the component (A2), the structural formula shown in the following Table 1, the mass reduction rate [%], the viscosity [Pas], the silanol group Each linear polyorganosiloxane polymer with content [mmol / g] and alkenyl content [mmol / g]. Moreover, the polyor...

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Abstract

Provided is a silicone rubber composition that exhibits improved moldability, particularly extrusion moldability, while also ensuring that a cured product obtained therefrom has sufficient strength. Asilicone rubber composition comprising: (A) 100 parts by mass of a base polymer formed from (A1) a polyorganosiloxane diol having a viscosity at 25 DEG C of 1 to 100 Pa*s, and (A2) a polyorganosiloxane having a viscosity at 25 DEG C of 0.2 to 40,000 Pa*s, wherein the proportion of (A1) with respect to the total amount of (A) is 20 to 100 mass%, the viscosity at 25 DEG C is 5 to 20,000 Pa*s, and the alkenyl group content is 0.001 to 0.3 mmol / g; (B) 10 to 50 parts by mass of a silica powder having a specific surface area of 50 to 400 m2 / g; (C) 1 to 10 parts by mass of an organosilazane; and (D)a catalytic amount of a curing agent.

Description

technical field [0001] The present invention relates to a silicone rubber composition, a method for producing the same, and an extruded silicone rubber product, and particularly relates to a millable type silicone rubber composition, a method for producing the same, and an extruded silicone rubber product. Background technique [0002] Silicone rubber has excellent properties such as weather resistance, electrical properties, low compression set, heat resistance, and cold resistance, so it is widely used in various fields including electrical equipment, automobiles, construction, medical care, and food. Among silicone rubbers, kneadable silicone rubbers are widely used in the manufacture of rubber parts because they can be mixed with coloring agents and the like by simple devices such as twin rolls, and can be molded by simple equipment such as presses. It retains its shape even in the uncured state, so it is widely used for extrusion molding of pipes and gaskets. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/06C08K3/36C08K5/14C08K5/5445C08K5/56C08L83/05C08L83/07
CPCC08K3/36C08K5/14C08K5/56C08L83/06C08G77/12C08G77/20C08G77/08C08L83/04C08L83/00C08K5/544C08J3/28C08J2383/04
Inventor 岛川雅成
Owner MOMENTIVE PERFORMANCE MATERIALS JAPAN LLC
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