A kind of addition type curable polysiloxane composition

The technology of polysiloxane and hydrogen polysiloxane is applied in the field of addition type curable polysiloxane composition, and can solve the problems of not being able to meet environmental protection requirements, poor dispersibility, affecting storage performance and the like

Active Publication Date: 2019-04-09
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2,2'-bipyridine, 2,2',2"tripyridine, o-phenanthroline and acetylenic alcohol inhibitors are used in the curable polysiloxane composition disclosed in Japanese patent (Japanese Patent Application Hei 05-186696) Combined use can overcome the surface roughness after vulcanization caused by the use of acetylenic alcohol inhibitors alone, but this type of inhibitor has poor dispersion performance in silicone, and it needs to be configured as a toluene solution when used, and toluene is very volatile , will affect the storage performance at room temperature, and the inhibitor itself has toxicity problems, which cannot meet the needs of environmental protection
Japanese patent (Japanese Patent Laid-Open No. 8-183908) uses allyl-containing amide compounds such as tetraallyl terephthalamide as inhibitors, which can also reduce wrinkles on the surface of the sulfide, but there is also the problem of poor dispersion

Method used

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  • A kind of addition type curable polysiloxane composition
  • A kind of addition type curable polysiloxane composition
  • A kind of addition type curable polysiloxane composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 100 parts of α, ω-divinylpolydimethylsiloxane with a viscosity of 200mPa·s (25 degrees, measured by a rotational viscometer), 0.03 part of Karstedt catalyst (platinum-1,3-divinyltetramethyl Disiloxane complex, 3ppm Pt), 0.01 parts of (3,5-dimethyl-1-hexyne-3-oxyl)methyldimethoxysilane and 5.0 parts of organic The hydrogenated polysiloxane is mixed evenly in the container (the molar ratio of Si-H to SiVi is 1.7).

[0032]

Embodiment 2

[0034] Replace 0.01 part of (3,5-dimethyl-1-hexyne-3-oxyl)methyldimethoxysilane in Example 1 with 0.01 part of (3,5-dimethyl-1-hexyl Alkyne-3-oxyl)γ-methacryloxypropyldimethoxysilane. At the same time, 10 parts of hexamethyldisilazane modified white carbon black were added.

Embodiment 3

[0036] 100 parts of α, ω-divinylpolydimethylsiloxane with a viscosity of 1000mPa·s (25 degrees, measured by a rotational viscometer), 0.1 part of Karstedt catalyst (platinum-1,3-divinyltetramethyl Disiloxane complex, 10ppm Pt), 0.1 parts of (3-phenyl-1-butyne-3-oxyl)(2,3-glycidoxy)propyldimethoxysilane and 3 parts of The organohydridopolysiloxane of the structural formula (IV) is uniformly mixed in the container (the molar ratio of Si—H to SiVi is 1.6).

[0037]

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Abstract

The invention provides an addition type solidifiable polysiloxane composition which is prepared from the following components of (A) organopolysiloxane with two or a plurality of alkenyls, (B) organic hydrogenated polysiloxane, (C) a platinum group metal catalyst and (D) an alkoxy silanization acetylenic compound. Each molecule of the organic hydrogenated polysiloxane comprises more than two silicon elements bonded with hydrogen atoms. The composition can be stored for a long time in a room temperature. In high-temperature solidification, the surface and the inside of the composition can be evenly solidified, and a cured product is smooth in surface and free of wrinkle. The addition type solidifiable polysiloxane composition can be widely applied to the fields of a pouring material, a coating material and addition type silicone rubber of an electronic device and liquid injection moulding silicone rubber.

Description

technical field [0001] The invention relates to an addition-type curable polysiloxane composition which can be stored at room temperature for a long time, can be uniformly cured at high temperature, and has no wrinkles on the surface of the cured product. Background technique [0002] The addition-type curable polysiloxane composition can be used in various applications as a cured product having properties such as heat resistance and weather resistance, and rubber properties such as hardness and elongation. A general addition-curable polysiloxane composition is mainly composed of an organopolysiloxane having an alkenyl group, an organohydrogenpolysiloxane, and a hydrosilylation reaction catalyst. However, when these components are mixed together, they will quickly cross-link and solidify, making the operation very inconvenient. In order to prolong the storage time of curable components at room temperature, most acetylenic alcohol compounds are used as inhibitors. However, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08L83/05C08K9/06C08K3/36
CPCC08L83/04C08L2205/025C08K9/06C08K3/36
Inventor 唐红定熊英刘进
Owner WUHAN UNIV
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