Heat-conducting silicone rubber with high electric dielectric strength and preparation method of heat-conducting silicone rubber

Abstract

The invention discloses heat-conducting silicone rubber with high electric dielectric strength, belonging to the technical field of silicone rubber. The heat-conducting silicone rubber comprises a component A and a component B in a mass ratio of (1 to 0.1)-(1 to 15), wherein the component A comprises the following components in parts by weight: 100 parts of alpha-omega-terminal hydroxyl hydrogen-containing polydimethylsiloxane, 5-15 parts of a silane coupling agent, 0.05-5 parts of a catalyst I, 100-200 parts of a heat-conducting insulating filling and 5-15 parts of an anti-sedimentation agent; and the component B comprises the following components in parts by weight: 100 parts of low-molecular-weight alpha-omega-vinyl polydimethylsiloxane and 0.5-5 parts of a catalyst II. The invention further provides a preparation method of the heat-conducting silicone rubber with high electric dielectric strength. The preparation method comprises the following steps: (1) preparing the component A; (2) preparing the component B; and (C) preparing the silicone rubber. The silicone rubber has good heat-conducting property and high electric dielectric strength, and the degrading of the electric dielectric performance caused by the introduction of the heat-conducting filling is avoided.

Description

technical field

[0001] The invention relates to a silicone rubber, in particular to a heat-conducting silicone rubber with high electrical insulation strength and a preparation method thereof, belonging to the technical field of silicone rubber. Background technique

[0002] As a special rubber, silicone rubber belongs to synthetic rubber. Silicone rubber has a structure in which silicon atoms and oxygen atoms are alternately arranged as the main chain, which makes it much more stable to heat and oxygen than ordinary organic polymers. Compared with ordinary rubber, silicone rubber has the following advantages: it has excellent properties such as high and low temperature resistance, electrical insulation, ozone resistance, radiation resistance, flame retardant, water repellency, corrosion resistance, non-toxic and tasteless, and physiological inertia. Due to these excellent properties, silicone rubber plays an irreplaceable role in high-tech fields such as aerospace, electron...