Preparation method of heat-conduction silicon rubber

Abstract

The invention discloses a preparation method of a heat-conduction silicon rubber, and belongs to the technical field of rubber materials. The method comprises the following steps that, firstly, octamethylcyclotetrasiloxane and methylphenyl cyclosiloxane are used as raw materials to react under the catalysis of sulfuric acid to prepare a methylphenyl silicon rubber, so that defects that common rubbers cannot be cured or the curing speed is very slow at room temperature and the abrasive resistance is poor are overcome; secondly, carbon fibers are used as raw materials; the carbon fibers have a plurality of excellent properties such as good fatigue resistance, good thermal expansion coefficient and excellent heat conduction and conductivity, the surface contact area of the carbon fibers and the silicon rubber is increased, the interface bonding capability of the carbon fibers and a silicon rubber matrix is enhanced, and the reinforcing effect of the carbon fibers is exerted; thirdly, quartz sand and sawdust are used as raw materials, the quartz sand contains silicon dioxide, the sawdust contains a large amount of carbon elements, the mixture containing silicon carbide is prepared by taking the quartz sand and the sawdust as raw materials through high-temperature smelting in a resistance furnace, and the method has wide application prospects.

Description

technical field [0001] The invention discloses a method for preparing heat-conducting silicone rubber, which belongs to the technical field of rubber materials. Background technique [0002] Silicone rubber is a special synthetic rubber with silicon-oxygen bonds as the main chain. Its special structure determines that it has high and low temperature resistance, ozone resistance, radiation resistance, weather resistance and excellent chemical inertness to lubricating oil and other media. In addition, it also has a wide application range from -50°C to 300°C, and has good elasticity, but the thermal conductivity of silicone rubber as a filler is poor, and its thermal conductivity can be improved by filling with thermally conductive fillers. Thermally conductive materials are widely used in aviation, aerospace, electronics, electrical, automotive and other fields that require heat dissipation and heat transfer. With the advancement of science and technology and industrial produc...

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Problems solved by technology

[0006] The technical problem mainly solved by the present invention is that the heat-conducting silicone rubber currently on the market has a low thermal conductivity, cannot meet the requirements of ideal heat dissipation, has poor strength, is not resistant to friction, cannot be cured at room temperature or has a very slow curing speed, and is difficult to cure. The time is very long and the defects of poor fluidity provide a preparation method for thermally conductive silicone rubber

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