High-toughness and high heat conduction composite silicone gasket

Abstract

The invention discloses a high-toughness and high heat conduction composite silicone gasket. The high-toughness and high heat conduction composite silicone gasket is prepared from the following components in parts by weight: 400 to 600 parts of alumina particles, 120 to 180 parts of dimethicone, 10 to 20 parts of polysiloxane, 1 to 8 parts of MQ silicon resin, 5 to 15 parts of methylvinyl siliconerubber, 3 to 8 parts of a silane coupling agent, 3 to 12 parts of a silica reinforcement agent, 1 to 3 parts of a catalyst and 0.3 to 0.8 part of an inhibitor. Compared with the prior art, the high-toughness and high heat conduction composite silicone gasket disclosed by the invention has the advantages that silicone components are reasonably proportioned, and the spherical alumina particles aresieved, so that the alumina particles are reasonably distributed in a silicone matrix and the heat conductivity coefficient of the alumina particles is improved; the silicone gasket disclosed by the invention has high insulating property; and in addition, the heat conductivity coefficient of the silicone gasket is improved to 6.0 W or above, which is out of reach by the prior art. Besides, the silicone gasket disclosed by the invention has superstrong toughness and can still keep higher toughness and strength in the preparation process of sheets.

Description

technical field [0001] The invention relates to a silica gel gasket, in particular to a high-toughness and high-thermal-conduction composite silica gel gasket. Background technique [0002] Silicone rubber is a special synthetic rubber with silicon-oxygen bonds as the main chain, while ordinary rubber has a structure of C-C bonds as the main chain. Due to the particularity of its structure, it has high and low temperature resistance, high voltage resistance, ozone aging resistance, radiation resistance, high air permeability, and excellent chemical inertness to lubricating oil and other media. In addition, it has a wide temperature range (-50°C-250°C), good elasticity, good resistance to tracking and electrical corrosion, especially after its surface is polluted, it still has good hydrophobic properties. Therefore, it is of great significance to use silicone rubber as a thermally conductive matrix and compound it with high thermally conductive fillers to make an elastic the...

AI Technical Summary

Problems solved by technology

[0003] Heat is mainly transferred through three ways: heat conduction, heat convection and heat radiation. For heat-conducting silica gel, its main heat-conducting mechanism is through heat conduction. The heat-conducting silica gel currently used has insufficient internal heat-conducting channels, resulting in the heat conduction of the silica gel pad. Poor performance, which limits its scope of application

[0004] In addition, the thinnest heat-conducting silicone gaskets currently on the market are generally more than 0.3mm. When the thickness is less than 0.3mm, due to the insufficient toughness and strength of the product, it will bring great trouble to the operator. Therefore, in some specific Occasionally, in order to achieve a better heat dissipation effect, it is necessary to choose high thermal conductivity silicone products, which increases the cost