Composite heat conduction material and preparation method thereof, and heat conduction gel and preparation method thereof

The invention is applicable to the technical field of materials, and provides a composite heat-conducting material and a preparation method thereof, and heat-conducting gel and a preparation method thereof. The preparation method of the composite heat-conducting material comprises the following steps: uniformly mixing spherical heat-conducting powder, irregular heat-conducting powder and superfine spherical heat-conducting powder to obtain compound heat-conducting powder; and adding a structure modifier into the compound heat-conducting powder under the condition of high-speed stirring, and carrying out surface treatment to obtain the composite heat-conducting powder. The structural modifier adopted by the invention contains hydrolyzable alkoxy, vinyl and a silicone oil long chain segment, and hydroxyl generated by hydrolysis of the alkoxy can react with the surface of the heat-conducting powder to form a chemical bond, so that the vinyl and the silicone oil long chain segment exist on the surface of the heat