▎ 摘　　要

NOVELTY - A boron nitride/graphene double heat conductive base aerogel composite phase change material comprises a modified boron nitride/graphene aerogel and n-octadecane by vacuum impregnation method. The boron nitride/graphene double heat conductive base aerogel composite phase change material is prepared by preparing boron nitride/graphene hydrogel with graphene oxide, modified boron nitride, polyvinylpyrrolidone and ethylenediamine as raw materials, freezing and drying, and calcining at a constant temperature. USE - Boron nitride/graphene double heat conductive base aerogel composite phase change material. ADVANTAGE - The boron nitride/graphene double heat conductive base aerogel composite phase change material has improved thermal conductivity by 738%, high latent heat of phase change and excellent thermal stability and effectively solves the leakage problem in the phase change process. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) manufacture of the boron nitride/graphene double heat conductivity base aerogel composite phase change material, which involves (i) preparing modified boron nitride by placing the boron nitride in a certain concentration of sodium hydroxide solution, and carrying out the modification reaction under certain conditions, after the reaction is completed, filtering the resulting product and washing until the pH is neutral, drying and grinding to obtain the modified boron nitride, (ii) preparing boron nitride/graphene double heat conductive base aerogel, by mixing the obtained modified boron nitride with polyvinylpyrrolidone and deionized water to obtain a boron nitride solution, ultrasonically processing a certain concentration of graphene oxide solution to obtain the graphene oxide solution, mixing and emulsifying the boron nitride solution and the graphene oxide solution in a certain proportion to obtain a mixed solution, and adding ethylenediamine to the mixed solution in a certain proportion and ultrasonically dispersing to obtain a reaction solution, subjecting the reaction solution to a hydrothermal reaction, under certain conditions, and washing the resulting product, freezing and drying, performing constant temperature calcination under certain conditions, and finally obtaining boron nitride/graphene double heat conductive aerogel and (iii) preparing boron nitride/graphene double heat conductive base aerogel composite phase change material, by impregnating n-octadecane with a certain mass ratio, using the vacuum impregnation method, into the obtained boron nitride/graphene double heat conductive aerogel; and (2) use of the boron nitride/graphene double heat conductivity base aerogel composite phase change material as a phase change material, which has the thermal conductivity is 0.9-1.6 W/(m.K).