▎ 摘　　要

NOVELTY - Preparing modified graphene oxide/natural rubber high thermal conductivity composite material involves preparing hexagonal boron nitride nanosheets by ultrasonic-assisted stripping. The hexagonal boron nitride is pretreated at a high temperature, and the pretreated hexagonal boron nitride is added to the organic solvent and fully stirred. The mixed solution is added to the container at 30-80 degrees C with 120-200 watt ultrasonic and mechanical stirring for 6-12 hours, added the silane coupling agent during the stirring process. The ultrasonic treatment solution is put under centrifugation with 3000-12000rpm, washed and dried to obtain hexagonal boron nitride nanosheets. The preparation of hexagonal boron nitride nanosheet modified graphene oxide dispersion by adding deionized water to the graphene oxide slurry, ultrasonic and simultaneous mechanical stirring to prepare graphene oxide aqueous solution. USE - Method for preparing modified graphene oxide/natural rubber high thermal conductivity composite material. ADVANTAGE - The method enables to prepare modified graphene oxide/natural rubber high thermal conductivity composite material has improves thermal conductivity of the natural rubber composite material, so that it can be increased to 0.48W/m K, and has good mechanical properties of the material, broad applications in the fields of electronic packaging and tires. DETAILED DESCRIPTION - Preparing modified graphene oxide/natural rubber high thermal conductivity composite material involves preparing hexagonal boron nitride nanosheets by ultrasonic-assisted stripping. The hexagonal boron nitride is pretreated at a high temperature, and the pretreated hexagonal boron nitride is added to the organic solvent and fully stirred. The mixed solution is added to the container at 30-80 degrees C with 120-200 watt ultrasonic and mechanical stirring for 6-12 hours, added the silane coupling agent during the stirring process. The ultrasonic treatment solution is put under centrifugation with 3000-12000rpm, washed and dried to obtain hexagonal boron nitride nanosheets. The preparation of hexagonal boron nitride nanosheet modified graphene oxide dispersion by adding deionized water to the graphene oxide slurry, ultrasonic and simultaneous mechanical stirring to prepare graphene oxide aqueous solution, adding the prepared hexagonal boron nitride nanosheets to the graphene oxide aqueous solution, and magnetically stirring to obtain the hexagonal boron nitride nanosheet modified graphene oxide dispersion. The preparation of high thermal conductivity natural rubber composite material by adding the hexagonal boron nitride nanosheet modified graphene oxide dispersion to the latex, continuously adding water and stirring to make the mixing uniform, adding formic acid to break the emulsion to obtain the raw rubber. The raw rubber is soaked in water to remove formic acid, then plasticize, mixed and vulcanized. The hexagonal boron nitride nanosheet modified graphene oxide is aligned in the rubber compound by controlling the roll distance and the mixing time of the mill. The thermally conductive fillers are maintained in a directional arrangement to prepare modified graphene oxide/natural rubber high thermal conductivity composite material.