The invention relates to an inorganic hydrated salt expanded
graphite composite phase-changing
heat storage material. In the preparation method thereof, 85-89
mass parts of inorganic hydrated
salt sodium acetate trihydrate as a heat storage matrix, 5.5-6.5
mass parts of disodium hydrogenphosphate as a nucleating agent, 2.5-3.5
mass parts of
carboxymethyl cellulose as a
thickening agent, and 3-4.5 mass parts of expanded
graphite is blended in an inorganic hydrated salt mixture as a material with a high
thermal conductivity. Due to the use of the expanded
graphite, the material not only maintains excellent properties of natural
flake graphite such as good
thermal conductivity, no
toxicity and the like, but also has adsorbability which the natural
flake graphite does not have. The invention solves the problems of sub-cooling degree, phase stratification and low
thermal conductivity during the heat storage process. The composite phase-changing material has a low sub-cooling degree after the phase changing performance is improved, the solution thereof is uniform without
sedimentation and stratification during the
solid-
liquid phase change, the performance is stable, the
repeatability of good, and the phase-changing heat storage can be enhanced through improving the thermal
conductivity of the material.