Modified graphene microchip filled high-heat-conductivity insulating type silicon grease and preparation method thereof

The invention discloses a modified graphene microchip filled high-heat-conductivity insulating type silicon grease and a preparation method thereof. The method is characterized by the following steps: adding acetone and concentrated nitric acid into carbon fiber and soaking, thereby acquiring a surface oxidized carbon fiber; adding mixed acid into a graphene microchip and reacting, adding thionyl chloride and catalyst DMF, stirring and refluxing, adding 4-amino phenoxy phthalonitrile, stirring and reacting, washing and drying, thereby acquiring a cyanation graphene microchip; mixing ethyl alcohol and water and uniformly stirring, regulating pH, adding coupling agent and uniformly stirring, thereby acquiring a coupling agent hydrolysate; preheating a high-speed mixer, adding boron nitride powder and coupling agent hydrolysate for quickly treating and then pre-mixing with the acquired material, thereby acquiring a mixed filler; heating and dissolving ethyl alcohol and stearic acid, adding the mixed filler, stan