| abstract |
The invention relates to a thermally conductive silicone rubber composite material and a preparation method thereof, comprising the following components in parts by weight: 20-80 parts by weight of a silicone rubber matrix, 20-80 parts of an inorganic heat-conducting powder, 0.5-5 parts of silicone oil, and 0.2-2 parts of a crosslinking agent. , coupling agent 0.2~2. The preparation method is as follows: (1) Premixing: adding silicone rubber matrix, pretreated inorganic heat-conducting powder, cross-linking agent and other auxiliaries into a high-speed mixer for premixing; (2) Extrusion granulation: adding the premixed material to an extensional flow The plasticizing extrusion equipment is used for extrusion and granulation. During extrusion, the temperature of each section of the extensional rheological plasticizing extrusion equipment is 150-250 °C, the rotor speed is 10-150 rpm, and the feeder speed is 10- 100 rpm. The invention can prepare the injection-molding-grade thermally conductive silicone rubber composite material with excellent thermal conductivity and mechanical properties, so that it can be widely used in the heat dissipation fields of electronic appliances, aerospace, military industry and the like. |