▎ 摘　　要

NOVELTY - Composite phase change material comprises phase change material and graphene, where the mass ratio of the phase change material to the graphene is 1:(0.01-0.05); the composite phase change material has phase transition temperature of 54-62 degrees C, heat of fusion of 200-220 J/g, and density of 0.9 g/cm3. USE - The composite phase change material is useful for microwave heating energy storage in vacuum flask (claimed). ADVANTAGE - The composite phase change material: has simple design; is safe, suitable for large-scale industrial production; can satisfies daily heat preservation demand of beverage, and saves cost. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the composite phase change material comprising taking the phase change material as raw material, placing in fast heating device, adding graphene, stirring by using magnetic stirrer until completely dispersed, and naturally cooling to form composite phase change material.