The invention provides heat-conducting
silicone grease and a preparation method thereof. The heat-conducting
silicone grease is prepared from the following components in parts by
mass: 100 parts of
polydimethylsiloxane, 5-20 parts of modified
silicone oil, 1300-1800 parts of modified heat-conducting composite
powder and 2-10 parts of a thermal gel additive. Through grading of spherical aluminum
oxide with different particle sizes and by utilizing the characteristics of strong surface effect and small-size effect of nano
quantum dots, cavity gaps dispersed among aluminum
oxide particles are uniformly filled, so that the
thermal resistance of the product is effectively reduced, the thixotropic index of the heat-conducting
silicone grease is improved, and the heat-conducting
silicone grease is endowed with a
shear thinning characteristic; and meanwhile, the heat-conducting
silicone grease has enough binding power, and the
aging property of the heat-conducting silicone
grease is improved.Meanwhile, the
particle size distribution of the filler is strictly controlled, and the selected filler is very narrow in
particle size distribution and has good monodispersity; the filler with the particle size larger than 20 microns is screened out through sieving
processing, so that it is ensured that the filler grading effect is good, and gaps are avoided; and the heat-conducting silicone grease is low in
thermal resistance value and excellent in aging performance.