Phase change microcapsules as well as preparation method and application thereof

The invention belongs to the technical field of phase change microcapsules and discloses phase change microcapsules as well as a preparation method and application thereof. The phase change microcapsules are prepared through the following steps: firstly, preparing a dispersed phase, a continuous phase and a collection phase; based on a two-phase coaxial flow type microfluidic chip, adjusting flowspeeds of the dispersed phase and the continuous phase so as to convey the dispersed phase into the collection phase through the tail end of the microfluidic chip; enabling 2,4-diisocyanate in the dispersed phase and diethylenetriamine in the collection phase to react on the surfaces of liquid drops; covering a phase change material mixed with nanoparticles with a generated polyuria high polymer thin film layer; and drying to obtain the phase change microcapsules which have a uniform grain diameter and a stable shell layer and contain the nanoparticles in a core material. By adopting the phasechange microcapsules, the