▎ 摘　　要

NOVELTY - Preparing high thermal conductivity phase-change microcapsule comprises preparing regenerated chitin suspension, preparing regenerated chitin/graphene nanosheet dispersion as aqueous phase, mixing isophorone diisocyanate with the phase change material as oil phase, adding the oil phase to the aqueous phase to homogeneously obtain Pickering emulsion, adding an aqueous solution of ethylenediamine into the emulsion and heating until the reaction is complete to obtain phase-change microcapsules with high thermal conductivity. USE - The method is useful for preparing high thermal conductivity phase-change microcapsule. ADVANTAGE - The method adopts the Pickering emulsion aggregate method to prepare heat-conducting phase-change microcapsules, which contributes to uniform distribution of heat-conducting particles in the shell material. The thermally conductive microcapsule has diameter of 10-30 μm and thermal conductivity of 0.65 W/m.K, and increases the thermal conductivity by more than 130%. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: a method for preparing a phase-change film with high thermal conductivity comprising preparing regenerated chitin suspension, preparing regenerated chitin/graphene nanosheet dispersion as aqueous phase, mixing isophorone diisocyanate with phase change material as oil phase, adding oil phase to aqueous phase, homogenizing to Pickering emulsion, adding aqueous solution of ethylenediamine to the emulsion, heating until the reaction is complete to obtain high thermal conductivity phase change microcapsules, dissolving polyurethane solution in N,N-dimethylformamide, adding high thermal conductivity phase change microcapsules, stirring evenly, remove N,N-dimethylformamide from the dispersion and dry to obtain a thermally conductive phase change film, where the mass concentration of the high thermal conductivity phase change microcapsules is 50-80 wt.%, and the mass ratio of the polyurethane solution to N,N-dimethylformamide is 1:0.5-1:6; and a method for preparing phase-change fibers with high thermal conductivity comprising preparing a suspension of regenerated chitin, preparing a dispersion of regenerated chitin/graphene nanosheets as an aqueous phase, mixing isophorone diisocyanate and phase change material as the oil phase, adding the oil phase to the aqueous phase to obtain a Pickering emulsion homogeneously, adding aqueous solution of ethylenediamine to the emulsion, heating until the reaction is complete to obtain high thermal conductivity phase change microcapsules, mixing thermally conductive phase change microcapsules, polyurethane solution and N,N-dimethylformamide evenly, injecting into the coagulation bath through a syringe, taking out the obtained fiber after reaction, and drying it at room temperature to obtain a thermally conductive phase change fiber, where the mass concentration of high thermal conductivity phase change microcapsules is 50-80 wt.%, the mass ratio of polyurethane solution to N,N-dimethylformamide is 1:0.5-1:6, and the diameter of the syringe needle is 0.40-0.9 mm.