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Silicone gel composition

一种硅氧烷凝胶、组合物的技术，应用在硅氧烷凝胶固化产品领域，能够解决丧失硅氧烷凝胶固化产品低应力特性等问题，达到低应力、低弹性模量、没有污染的效果

Inactive Publication Date: 2005-11-16
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, method (1) risks losing the low stress characteristics of silicone gel-cured products, and methods (2) and (3), while reducing the rate of free oil leakage, fail to provide a fundamental solution to the problem

Method used

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  • Silicone gel composition
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] 100 parts of dimethylpolysiloxane with a viscosity of 1000mPa·s terminated by dimethylvinylsiloxy at both ends; 63 parts of dimethylpolysiloxane with a viscosity of 1000mPa·s terminated by trimethylsiloxy at both ends The copolymer of siloxane and methyl hydrogen siloxane, as shown in following formula (3):

[0060]

[0061] (corresponding to each silicon-bonded alkenyl group in component (A), the number of silicon-bonded hydrogen atoms in component (B) (expressed here as H / Vi) is 1.05); and 0.05 Parts of dimethylpolysiloxane solutions of chloroplatinic acid-vinylsiloxane complexes containing 1% platinum atoms are evenly mixed together, and the prepared composition is heated to 150°C for 30 minutes to cure, so as to obtain needle penetration A cured product with a degree of 70. According to the regulation of JIS K2220 (this regulation is also applied in each of the following examples), the penetration is 1 / 4 cone penetration.

Embodiment 2

[0063] 100 parts of dimethylpolysiloxane with a viscosity of 5000mPa·s terminated by dimethylvinylsiloxy at both ends; 25 parts of dimethyl polysiloxane with a viscosity of 600mPa·s terminated by dimethylhydrogensiloxy The copolymer of base siloxane and methyl hydrogen siloxane, as shown in following formula (4):

[0064]

[0065] (H / Vi is 1.3); and 0.05 part of dimethylpolysiloxane solution of chloroplatinic acid-vinylsiloxane complex containing 1% platinum atoms are uniformly mixed together, and the prepared composition is heated Curing at 150°C for 30 minutes to obtain a cured product with a penetration of 40.

Embodiment 3

[0067] 100 parts of a copolymer of dimethylsiloxane and methylvinylsiloxane with a viscosity of 1000mPa·s terminated by trimethylsiloxy at both ends, as shown in the following formula (5):

[0068]

[0069] 40 parts of dimethyl polysiloxane with a viscosity of 600 mPa·s terminated by dimethyl hydrogen siloxy at both ends, as shown in the following formula (6):

[0070]

[0071] (H / Vi is 0.95); and 0.05 part of dimethylpolysiloxane solution of chloroplatinic acid-vinylsiloxane complex containing 1% platinum atoms are uniformly mixed together, and the prepared composition is heated Curing at 150°C for 30 minutes to obtain a cured product with a penetration of 120.

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Abstract

Provided is a silicone gel composition including (A) an organopolysiloxane containing at least one alkenyl group bonded to a silicon atom within each molecule, represented by an average composition formula: Ra R1b SiO(4-a-b) / 2 (wherein, each R group represents, independently, an alkenyl group, each R1 group represents, independently, an unsubstituted or substituted monovalent hydrocarbon group that contains no aliphatic unsaturated bonds, a represents a positive number from 0.0001 to 0.2, b represents a positive number from 1.7 to 2.2, and a+b represents a number within a range from 1.9 to 2.4), (B) an organohydrogenpolysiloxane containing at least two hydrogen atoms bonded to silicon atoms within each molecule, and (C) a platinum-based catalyst. Also provided is the silicone gel composition stated above, in which a penetration value of a cured product of this composition, as defined in JIS K2220, is within a range from 20 to 200. The silicone gel composition generates a silicone gel cured product which displays a low elastic modulus and low stress, and suffers no oil bleeding over time.

Description

technical field [0001] The present invention relates to a silicone gel composition which results in a silicone gel cured product which does not bleed oil over time. Background technique [0002] The silicone gel composition is an addition reaction curable organopolysiloxane composition comprising an organohydrogenpolysiloxane containing silicon atom-bonded hydrogen atoms (i.e., SiH groups), an organohydrogenpolysiloxane containing Alkenyl, such as silicon-bonded vinyl organopolysiloxanes, and platinum-based catalysts, these compositions produce a cured product by the addition of silicon-bonded hydrogen atoms to alkenyl groups. The silicone gel cured product prepared by heating and curing the silicone gel composition exhibits excellent heat resistance, weather resistance, oil resistance, cold resistance and electrical insulation, and also exhibits low elastic modulus values ​​and Low stress level, therefore, they are widely used in the protection of electronic components, su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08L83/07
CPCC08L83/04C08G77/20C08G77/12C08L83/00
Inventor 田中实行佐藤一安
Owner SHIN ETSU CHEM CO LTD
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