Heat-conducting siloxane composition

The invention provides a heat-conducting siloxane composition, and belongs to the technical field of silicone rubber. Comprising 60-100 parts of organopolysiloxane A, 1-40 parts of organopolysiloxane B, 100-1500 parts of heat-conducting powder and 0.1-2 parts of a catalyst I for catalyzing hydrosilylation reaction, each molecule of the organopolysiloxane A contains at least two alkenyl groups capable of participating in the hydrosilylation reaction and does not contain silicon hydroxyl and siloxy, and each molecule of the organopolysiloxane B contains at least two alkenyl groups capable of participating in the hydrosilylation reaction and does not contain silicon hydroxyl and siloxy. Organopolysiloxane B: each molecule contains at least two silicon hydrogen groups, and does not contain hydroxyl and alkoxy; the heat-conducting powder is treated by a surface treating agent. According to the present invention, the heat conduction powder is treated by using the wet method so as to organize the surface of the powd