Composite phase change heat storage material and preparation method thereof

The invention discloses a composite phase-change heat storage material and a preparation method thereof. The composite phase-change heat storage material is prepared from the following components in parts by weight: 30-40 parts of a phase-change material, 35-50 parts of modified expanded vermiculite, 8-15 parts of graphite and 2-10 parts of heat-conducting reinforcing filler, the modified expanded vermiculite is arranged in a thin-layer laminated sheet shape in which a large number of nano-copper particles are embedded. The modified expanded vermiculite embedded with a large number of thin layered laminations of nano-copper particles is adopted, the nano-copper particles can provide a large number of supporting point positions for every two layered laminations of the expanded vermiculite, the deformation resistance of the material is improved, meanwhile, the nano-copper particles have high thermal conductivity, and the heat charging and discharging performance of the material can be further improved. 本发明公开了一种