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

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...

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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, etc. can only achieve good thermal conductivity, but cannot achieve flame retardancy and thixotropy, and adding a large amount will inevitably increase the viscosity of the system, resulting in a decrease in construction performance; traditional flame retardant Fillers such as aluminum hydroxide and N / P compounds need to be added in a higher amount to have a flame retardant effect, but will hinder thermal conductivity; traditional thixotropic agents such as fumed silica can significantly improve thixotropy, but poor thermal conductivity

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