▎ 摘　　要

NOVELTY - Energy material having heat preservation and heating properties is claimed. The material having phase energy storage function is prepared by blending azobenzene/graphene composite material with phase energy storage function and phase change material to obtain final product. The mass ratio between azobenzene/graphene composite material and phase change material is 1:5-10, and the azobenzene/graphene composite material (I) is composed of graphene and azobenzene grafted onto the surface of the graphene by covalent bonding. USE - Used as energy material having heat preservation and heating properties. ADVANTAGE - The material: stores and maintains heat; is conducive to heat and reduces heat loss; and is sandwiched between the quartz glass and the polyimide film, and thus transfers heat in one direction. DETAILED DESCRIPTION - Energy material having heat preservation and heating properties is claimed. The material having phase energy storage function is prepared by blending azobenzene/graphene composite material with phase energy storage function and phase change material to obtain final product. The mass ratio between azobenzene/graphene composite material and phase change material is 1:5-10, and the azobenzene/graphene composite material of formula (I) is composed of graphene and azobenzene grafted onto the surface of the graphene by covalent bonding. INDEPENDENT CLAIMS are also included for: (1) preparing energy material having heat preservation and heating properties comprising blending azobenzene/graphene composite material with phase energy storage function and phase change material in a mass ratio of 1:5-10, where azobenzene/graphene composite material is prepared by e.g. adding graphene and heterocyclic azobenzene into aqueous N,N dimethylformamide solution and dispersing uniformly, reacting under inert protective gas atmosphere at 100-150 degrees C to make heterocyclic azobenzene covalently graft to the reaction site on the surface of graphene to obtain heterocyclic azobenzene/graphene solar heat storage material, and reacting the amino group of the heterocyclic azobenzene to make it covalently bonded to the graphene structure, and heterocyclic azobenzene is (Z)-5-((4-amino-2,6-dimethoxyphenyl)diazenyl)-4H-1,2,4-triazole-3-carboxylic acid; and (2) use method of energy material having heat preservation and heating properties comprising using polyimide material as the bottom layer, which has thermal insulation effect, dual-function energy material as intermediate layer, and upper layer is quartz glass which can transmit ultraviolet light, irradiating heterocyclic azobenzene/graphene-graphene composites with quartz glass, heating and packing together to obtain unidirectional thermally conductive material.