▎ 摘　　要

NOVELTY - Preparing high thermal conductivity insulating polyvinyl butyral intermediate film, comprises adding few-layer graphene and dispersant into solvent, and using high-shear equipment to stir at normal temperature, adding hexagonal boron nitride and dispersant into the solvent, and stirring at room temperature using high-shear equipment, centrifuging hexagonal boron nitride dispersion, taking out the supernatant, then adding silane coupling agent hydrolysis liquid, stirring at room temperature, mixing graphene dispersion liquid and modified hexagonal boron nitride dispersion, adding polyvinyl butyral into solvent, and stirring at room temperature, uniformly mixing additive with polyvinyl butyral resin dispersion, and coating and drying polyvinyl butyral interlayer dispersion to obtain final product. USE - The method is useful in preparing high thermal conductivity insulating polyvinyl butyral intermediate film. ADVANTAGE - The method: improves the insulating effect of the polyvinyl butyral intermediate film; and ensures the light transmittance of the material. The polyvinyl butyral intermediate film: has strong mechanical strength and mechanical properties. DETAILED DESCRIPTION - Preparing high thermal conductivity insulating polyvinyl butyral intermediate film, comprises (i) adding few-layer graphene and dispersant into solvent, and using high-shear equipment to stir at normal temperature to obtain graphene dispersion liquid, where the addition amount includes 2-20 g few-layer graphene/liter of solvent, and 0.02-0.5 g dispersant/gram of few-layer graphene, (ii) adding hexagonal boron nitride and dispersant into the solvent, and stirring at room temperature using high-shear equipment to obtain a hexagonal boron nitride dispersion, centrifuging the hexagonal boron nitride dispersion, taking out the supernatant, then adding silane coupling agent hydrolysis liquid, and stirring at room temperature for 2-3 hours to obtain a modified hexagonal boron nitride dispersion, where the addition amount includes 2-20 g hexagonal boron nitride/liter of solvent, 0.02-0.5 g dispersant/gram of hexagonal boron nitride, and 0.4-4 g 2-8 wt.% silane coupling agent hydrolysis liquid/liter of supernatant, the silane coupling agent is amino or epoxy silane coupling agent, and the dispersant in step (i) and (ii) is same i.e. macromolecule surfactant, (iii) mixing the graphene dispersion liquid and the modified hexagonal boron nitride dispersion with the volume ratio of 1:1-3 to obtain an additive, (iv) adding polyvinyl butyral into solvent, and stirring at room temperature to obtain polyvinyl butyral resin dispersion, where the addition amount of polyvinyl butyral is 20-800 g/liter of solvent, and the solvent in steps (i), (ii) and (iv) are same, (v) uniformly mixing the additive with the polyvinyl butyral resin dispersion to obtain polyvinyl butyral interlayer dispersion, where the addition amount of additives is 100-250 grams/kilogram of polyvinyl butyral resin dispersion, and (vi) coating and drying the polyvinyl butyral interlayer dispersion to obtain final product; where the drying includes placing a thick magnet parallel to the coating layer, and applying magnetic field with the strength of 0.1-1 Tesla to the coated polyvinyl butyral interlayer dispersion, and making the graphene plane in the polyvinyl butyral interlayer dispersion perpendicular to the surface plane of the intermediate film.