The invention discloses a flexible organic
silicon heat-conducting composition and a preparation method thereof, and relates to the technical field of heat-conducting materials. The flexible organic
silicon heat-conducting composition comprises a core heat-conducting composition, an insulating layer and an isolating layer from inside to outside, the core heat-conducting composition is prepared from the following components in percentage by
mass: 5 to 30 percent of organic
silicon base
polymer, 0.2 to 5 percent of organic silicon cross-linking agent, 1 to 8 percent of organic silicon chain
extender, 60 to 95 percent of heat-conducting filler, 0.1 to 1.2 percent of
powder dispersing agent, 0.02 to 0.2 percent of catalyst, 0.02 to 0.1 percent of
retarder and 0.4 to 6 percent of
toughening agent; the insulating layer is prepared from the following components in percentage by
mass: 85 to 95 percent of organic silicon base
polymer, 0.2 to 8 percent of organic silicon cross-linking agent, 1 to 10 percent of organic silicon chain
extender, 0.1 to 0.5 percent of
dewatering agent, 0.05 to 0.15 percent of catalyst, 0.02 to 0.1 percent of
retarder and 1 to 15 percent of flexibilizer; the isolating layer comprises the following components in percentage by
mass: 95-99% of
metal oxide and 1-5% of a
powder dispersing agent. According to the present invention, the 1-8 W / mk level heat conduction
gap filling material has advantages of ultralow oil
permeation rate, high electrical insulation strength,
wide gap filling range and flexible application mode.