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Curable silicone rubber composition and silicone rubber part

A silicone rubber composition and curable technology, applied in the field of silicone rubber parts for keyboards, can solve the problems of increasing equipment and not being able to fully meet the requirements, and achieve the effect of excellent dynamic fatigue durability

Active Publication Date: 2020-08-18
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, with the miniaturization of equipment used in recent years, equipment with a shape that imposes a large deformation due to the material has increased
Therefore, it has not yet become a material that fully satisfies the strict requirements in recent years regarding dynamic fatigue durability.
[0006] On the other hand, examples of patents related to silicone rubber compositions containing alkenyl-containing silazane compounds include JP-A-54-146850 (Patent Document 7), JP-A-5-65417 (Patent Document 8), but these are only descriptions of high strength and silica treatment agents, and there is no description of improvement in fatigue durability.

Method used

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  • Curable silicone rubber composition and silicone rubber part
  • Curable silicone rubber composition and silicone rubber part
  • Curable silicone rubber composition and silicone rubber part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] Dimethylvinylsilane containing 99.850 mol% of dimethylsiloxane units as diorganosiloxane units constituting the main chain and 0.125 mol% of methylvinylsiloxane units as molecular chain terminal groups 100 parts of linear organopolysiloxane (raw rubber) with an average degree of polymerization of about 6,000 and an oxygen group of 0.025 mol%, BET specific surface area of ​​200 m 2 30 parts per g of fumed silica (trade name Aerosil 200, manufactured by Japan Aerosil Co., Ltd.), 3 parts of dimethylpolysiloxane having silanol groups at both ends as a dispersant, and an average degree of polymerization of 5 1.19 parts of a silazane compound represented by the following general formula (III) was kneaded with a kneader, and heat-treated at 170° C. for 2 hours to prepare a kneaded rubber.

[0108]

[0109] Add 0.4 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane as a cross-linking agent to 100 parts of the above-mentioned rubber compound, and mix uniformly, / cm 2 Und...

Embodiment 2

[0111] It manufactured similarly to Example 1 except having added 1.11 parts of the silazane compound represented by following general formula (V) instead of the silazane compound represented by general formula (III).

[0112]

Embodiment 3

[0114] It manufactured similarly to Example 1 except having added 1.11 parts of the silazane compound represented by the following general formula (VI) instead of the silazane compound represented by general formula (III).

[0115]

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Abstract

Providing a curable silicone rubber composition which gives a cured silicone rubber cured product excellent in dynamic fatigue durability. (A) the following average compositional formula (I) RaSiO (4-a) / 2 ( degree of polymerization 100 or more organopolysiloxane represented by I), (B) a specific surface area by the BET adsorption method is 50m2 / g or more reinforcing silica, (C) the following general formula; silazane compound represented by the formula (II) , (D) curable silicone rubber composition comprising as a main component curing agent. (R1 and unsubstituted or substituted monovalent hydrocarbon group or an alkenyl no respective aliphatic identical or different independently of the unsaturated bond is R2 group; at least one of R1 and R2 is an alkenyl group).

Description

technical field [0001] The present invention relates to a curable silicone rubber composition for giving a cured silicone rubber excellent in durability due to dynamic fatigue that undergoes repeated deformation such as elongation and bending after molding, and a silicone rubber for a key pad obtained by curing the composition. Rubber parts. Background technique [0002] Silicone rubber (elastomer-like elastomer that cures a silicone rubber composition) is widely used in electrical equipment, automobiles, construction, It is widely used in various fields including medical treatment and food. Examples include rubber contacts used as rubber contacts for remote controls, computer terminals, musical instruments, etc., gaskets for construction, rollers for copiers, developing rollers, transfer rollers, charging rollers, paper feed rollers, and other rollers, and audio devices. Such as anti-vibration rubber, pads for CDs, mobile phones, keyboards for personal computers, etc. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C08L83/07C08K3/36C08K5/5445
Inventor 石原夕佳
Owner SHIN ETSU CHEM IND CO LTD