Surface modification method of aluminum oxide for super-hydrophobic high-fluidity heat-conducting silicone grease

The invention discloses a surface modification method of spherical aluminum oxide for super-hydrophobic high-fluidity heat-conducting silicone grease, which comprises the following steps: by taking a mixture of spherical aluminum oxide and angular aluminum oxide as a raw material, carrying out hydrolysis reaction on a silane coupling agent 3-glycidyl ether oxypropyl trimethoxy silane, ethanol and water according to a certain proportion to form hydrolysate; then adding a hydrophobic coupling agent dodecyl triethoxy silane to form a synergistic reaction; during modification, spraying the mixed hydrolysate to the surface of the alumina filler for stirring and mixing, and performing a modification reaction under a high-temperature condition. The coupling agents KBM-403 and SICO-N1223 are combined, so that the modified product has the characteristics of low viscosity and high dispersity and also has high hydrophobicity, the problem of poor binding force of aluminum oxide and vinyl silicone oil is solved, the modif