▎ 摘　　要

NOVELTY - Material comprises 50-70 pts. wt. dimethyl fumarate, 25-40 pts. wt. carbonamide, 0.1-15 pts. wt. heat-conducting material and 0.1-4 pts. wt. nucleating agent. USE - The material is useful in technical field of phase change materials. ADVANTAGE - The material: has 69-91℃ phase-change temperature and 160-230 J/g enthalpy value, ≤20% thermal performance attenuation, good thermal stability, and ≤2℃ its supercooling degree after 1000 cycles, and increased thermal conductivity. The method is simple, easy, and suitable for industrial production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparing material, comprising (i) processing foamed heat-conducting material until it matches storage space of target heat storage container, and filling foam-shaped heat-conducting material in target heat storage container, choosing 50-70 pts. wt. dimethyl fumarate, 25-40 pts. wt. carbonamide and powdery or granular heat-conducting materials, uniformly stirring and mixing to obtain first mixed dry material, where the total mass fraction of foamy heat-conducting material and powdery or granular heat-conducting material is 0.1-15 (pts. wt.); or choosing 0.1-15 pts. wt. foamed heat-conducting material for processing until it matches storage space of target heat storage container, filling foam-shaped heat-conducting material in target heat storage container, choosing 50-70 pts. wt. dimethyl fumarate and 25-40 pts. wt. carboxamide, uniformly stirring and mixing to obtain first mixed dry material; or choosing 50-70 pts. wt. dimethyl fumarate, 25-40 pts. wt. carbonamide, and 0.1-15 pts. wt. powdery or granular heat-conducting materials, uniformly stirring and mixing to obtain first mixed dry material, (ii) heating first mixed dry material at 140-175℃, melting to form liquid homogeneous phase, and (iii) adjusting temperature of liquid homogeneous phase at 90-120℃, adding 0.1-4 pts. wt. nucleating agent, and uniformly stirring, then pouring into target heat storage container to obtain material.