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Fluorosilicone rubber composition and cured product thereof

A technology of fluorosilicone rubber and composition, which is applied in the field of fluorosilicone rubber composition and can solve the problems of inability to obtain heat-resistant fluorosilicone rubber and the like

Inactive Publication Date: 2010-06-09
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even when a composition containing such additives is used, fluorosilicone rubber having satisfactory heat resistance cannot be obtained

Method used

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  • Fluorosilicone rubber composition and cured product thereof
  • Fluorosilicone rubber composition and cured product thereof
  • Fluorosilicone rubber composition and cured product thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0074] [Preparation of composition]

[0075] The fluorosilicone rubber composition of the present invention can be obtained by uniformly mixing the above-mentioned components (A)-(D), and Add any other ingredients as desired. These ingredients can all be mixed at the same time, or can be added to the mixture at different times.

[0076] [Molding and curing method]

[0077] The method for molding and curing the fluorosilicone rubber composition of the present invention is not particularly limited, for example, the composition of the present invention can be molded using typical rubber molding methods such as compression molding (compression molding), transfer molding (transfer molding) , injection molding, extrusion molding (extrusion molding) or calender molding (calendar molding) molded into a desired shape and then cured, either at room temperature or by heating at a temperature of about 80-180°C, thereby forming a rubber molding such as a turbine Air supply hose, O-ring ...

Embodiment 1-2， comparative Embodiment 1-3

[0081] - Preparation of base compound A

[0082] First, Base Compound A was prepared using the method described below. That is, 100 parts by mass of an organopolysiloxane represented by the following formula (3) existing in a colloidal state at room temperature (25° C.), 20 parts by mass of dry silica A (product name: Aerosil (registered trademark) 200, manufactured by NipponAerosil Co., Ltd) and 4 parts by mass of diphenylsilanediol as a dispersant were uniformly mixed together, then heated at 150° C. for 4 hours, and the mixture was masticated and Plasticized, resulting in base compound A.

[0083]

[0084] (where p+q (that is, the degree of polymerization) is about 4,000, and q / (p+q) (that is, the ratio of vinyl-containing siloxane units to all siloxane units) is 0.15±0.05 moles %.)

[0085] - Preparation of composition

[0086] Subsequently, cerium oxide powder having an average particle size of 1 μm and a hydrotalcite-based inorganic anion exchanger IXE-700F (produ...

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Abstract

A fluorosilicone rubber composition including: (A) an organopolysiloxane containing trifluoropropyl groups and monovalent aliphatic unsaturated hydrocarbon groups, with a viscosity at 25 DEG C of not less than 10,000 mPas, represented by a specific average composition formula, in an amount of 100 parts by mass, (B) a silica-based filler, in an amount of 2 to 100 parts by mass, (C) a hydrotalcite-based inorganic anion exchanger, in an amount of 0.1 to 20 parts by mass, and (D) a curing agent, in an effective amount. Also disclosed is a cured product obtained by curing the composition. The composition forms a molded item that exhibits minimal deterioration in physical properties even when exposed to heat at temperatures of 200 DEG C or higher.

Description

technical field [0001] The present invention relates to a fluorosilicone rubber composition which exhibits excellent heat resistance after molding, and also to a cured product of the composition and a fluorosilicone rubber molded article formed from such a cured product (molded item). Background technique [0002] Fluorosilicone rubber exhibits excellent cold resistance, oil resistance, fuel oil resistance, compression recovery, etc., and is widely used in components of transportation means such as automobiles and airplanes, and in components of oil tankers. Among these, in those cases where fluorosilicone rubber is used for automobile components, especially when used for a turbo air hose, the rubber is exposed to a high temperature of 150° C. or higher, and there are Favorable thermal stability is sometimes required at temperatures of 200°C or higher. However, it is known that fluorosilicone rubber is more prone to siloxane unit decomposition and oxidative degradation tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/08C08K3/36C08K3/26
CPCC08K5/0025Y10T428/1386C08L83/08
Inventor 林田修大石和弘小池义明
Owner SHIN ETSU CHEM IND CO LTD
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