▎ 摘　　要

NOVELTY - Silicon dioxide- nitrate microcapsule phase change heat storage composite material comprises microcapsules and carbon materials, where the microcapsules have nitrate as the core material, core-shell structure with silicon dioxide as the shell layer; the carbon material as the modified support material of the microcapsules. USE - Used as silicon dioxide- nitrate microcapsule phase change heat storage composite material. ADVANTAGE - The materail has high thermal conductivity, excellent photo-thermal conversion efficiency and so on, the thermal conductivity of the material is in the 0.550-0.700W of -m-1 * K-1, the coating rate reaches more than 60 %, effectively increasing the heat storage efficiency of the material. The invention uses sol-gel method preparation small size microcapsule tightly coated by regular spherical silicon dioxide, it solves the problem of nitrate water-limiting, changes the disadvantages into advantages, improves the shape structure of the micro-capsule material, it can effectively resist the volume change and external stress influence in the core phase change process; and introducing a two-dimensional GO nano sheet with thermal conductivity light absorption and mechanical property, constructing stable structure uniform load micro-capsule, and improves material performance through the enhanced structure. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing silion dioxide-nitrate microcapsule phase change heat storage composite material, comprising (1) dissolving nitrate in water to obtain mixed solution A, dispersing carbon material in cyclopentyl methyl ether to obtain mixed solution B; (2) After the mixed solution A is stirred evenly, introducing emulsifier dropwise, and introducing mixed solution B, heating and stirring to obtain a stable W/O emulsion; (3) is dropped in step (2) gained W/O emulsion, Stirring to obtain a precursor solution; and (4) dropping ammonia water into the precursor solution, washing after the stirring reaction is completed, filtering and collecting the solid product.