Heat-conducting flame-retardant room temperature vulcanized silicone rubber and preparation method thereof

A room temperature vulcanization and silicone rubber technology, which is applied in the field of one-component room temperature vulcanization silicone rubber and its preparation, can solve the problems that electronic appliances cannot withstand high temperature baking, cannot achieve flame retardancy, thixotropy, and cannot fully meet heat dissipation requirements, etc. , to achieve good system compatibility, improve system compatibility, and good adjustable effect

Inactive Publication Date: 2015-05-06
TONSAN ADHESIVES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the electronic and electrical industry, traditional cooling fans can no longer fully meet the heat dissipation requirements, especially with the development of miniaturization and integration, traditional fans can no longer be installed; at the same time, some electronic appliances cannot withstand high-temperature baking, so RTV can only be used as a heat-conducting material , fixing hybrid integrated circuit substrates, bonding components
However, general thermally conductive fillers such as alumina, magnesia, boron nitride,

Method used

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  • Heat-conducting flame-retardant room temperature vulcanized silicone rubber and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050]50 parts of α,ω-trimethoxypolydimethylsiloxane with a viscosity of 1 Pa·s, 300 parts of spherical alumina with an average particle diameter of 20 μm, and 200 parts of irregular-shaped alumina with an average particle diameter of 2 μm, Add 3 parts of dodecyltrimethoxysilane into a high-speed dispersing mixer, mix for 15 minutes under the condition of vacuum degree >-0.09MPa, stir and react for 1 hour under the condition of vacuum degree and 120°C, cool to room temperature, and break the vacuum with nitrogen , add 50 parts of the above-mentioned α, ω-trimethoxypolydimethylsiloxane, and stir for 10 minutes under the condition of vacuum degree>-0.09MPa; then add 5 parts of gas-phase method titanium dioxide, and stir under the condition of vacuum degree>-0.09MPa 15min; finally add 4 parts of methyltrimethoxysilane, 1.5 parts of 1-(trimethylsilyl)benzotriazole, 2 parts of ethyl acetoacetate chelate of isopropyl titanate, aminopropyl trimethyl 1 part of oxysilane was stirred an...

Embodiment 2

[0052] 50 parts of α, ω-trimethoxypolydimethylsiloxane with a viscosity of 1 Pa·s, 600 parts of spherical alumina with an average particle diameter of 20 μm, 400 parts of irregular-shaped alumina with an average particle diameter of 2 μm, ten Add 4 parts of dialkyltrimethoxysilane into a high-speed dispersing mixer, mix for 15 minutes under the condition of vacuum degree >-0.09MPa, and stir and react for 1 hour under the condition of vacuum degree and 120°C, then cool to room temperature, and nitrogen breaks the vacuum. Add 50 parts of the above-mentioned α,ω-trimethoxy polydimethylsiloxane, and stir for 10 minutes under the condition of vacuum degree >-0.09MPa; then add 4 parts of gas-phase method titanium dioxide, and stir for 15 minutes under the condition of vacuum degree >-0.09MPa ; Finally, add 6 parts of methyltrimethoxysilane, 1 part of 1-(trimethylsilyl) benzotriazole, 0.3 part of dibutyltin dilaurate, and 1.5 parts of aminopropyltrimethoxysilane, in a vacuum Stir and...

Embodiment 3

[0054] 50 parts of α, ω-trimethoxypolydimethylsiloxane with a viscosity of 1 Pa·s, 500 parts of spherical alumina with an average particle diameter of 30 μm, 300 parts of irregular-shaped alumina with an average particle diameter of 4 μm, ten Add 2.5 parts of dialkyltrimethoxysilane into a high-speed dispersing mixer, mix for 15 minutes under the condition of vacuum degree >-0.09MPa, and stir and react under the condition of vacuum degree and 120°C for 1 hour, then cool to room temperature, and nitrogen breaks the vacuum. Add 50 parts of the above-mentioned α,ω-trimethoxy polydimethylsiloxane, and stir for 10 minutes under the condition of vacuum degree >-0.09MPa; then add 4.5 parts of gas-phase method titanium dioxide, and stir for 15 minutes under the condition of vacuum degree >-0.09MPa ; Finally add 6 parts of methyltrimethoxysilane, 1 part of 1-(trimethylsilyl) benzotriazole, 3 parts of ethyl acetoacetate chelate of isopropyl titanate, aminopropyl trimethoxy 1 part of bas...

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Abstract

The invention discloses heat-conducting flame-retardant room temperature vulcanized silicone rubber. The silicone rubber consists of the following components in parts by weight: 100 parts of alpha, omega-triethoxy polydimethylsiloxane, 400-1500 parts of an inorganic heat conducting filler, 0.5-5 parts of a filler treating agent, 1-10 parts of titanium dioxide prepared by a vapor phase method, 0.5-15 parts of a cross-linking agent, 0.1-5 parts of a flame-retardant agent, 0-10 parts of a catalyst and 0-5 parts of a silane coupling agent. The silicone rubber and the preparation method use the alpha, omega-triethoxy polydimethylsiloxane so as to improve the processing property and the storing property of a composition system. Compared with the prior art, through the use of the silicone rubber and the preparation method, the compatibility, the storing property and the extrudability of the filler and the silicon rubber are improved, the flame retardance in a UL94-V0 level is realized, and the situation that because a large amount of the inorganic flame-retardant filler is used, the heat-conducting property of the system is influenced is avoided; silicon dioxide prepared by a vapor phase method is added, the thixotropy of the composition is regulated, and besides the heat-conducting property is not influenced; the silicone rubber has good system compatibility, a good regulable heat-conducting property and a good flame-retardant property and can be suitable for a glue point asking for a high heat dissipation property and a high flame-retardant property.

Description

technical field [0001] The invention relates to the field of polymer sealing materials, in particular to a heat-conducting and flame-retardant one-component room temperature vulcanization (RTV) silicone rubber and a preparation method thereof. Although the silicone rubber has a large amount of heat-conducting filler, it still has good extrudability and storage and system compatibility. Background technique [0002] As a one-component room temperature vulcanizing silicone rubber (RTV) refers to a composition that cures to form a rubbery elastomer at room temperature by contact with moisture in the air. According to the different small molecules released, it can be divided into deacidification type, deoxime type, dealcoholization type, and acetone removal type. With the rapid development of industries such as electronic appliances, the use of dealcoholized and acetone-free types has been promoted. At the same time, the dealcoholized type is relatively cheaper and less corrosi...

Claims

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Application Information

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IPC IPC(8): C08L83/06C08K13/06C08K9/06C08K3/22C08K3/28C08K3/38C08K3/04C08K3/08C08K5/3475
Inventor 肖明苏丹刘贵培
Owner TONSAN ADHESIVES INC
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