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This invention discloses a two-component PU / SIS injectable hydrogel material and its preparation method. The preparation method includes the following steps: S1. Preparing an isocyanate-terminated aqueous polyurethane prepolymer solution; S2. Preparing an aminated SIS porous microsphere suspension; S3. Dispensing component A and component B into a dual-syringe or parallel syringe, and sterilizing them to obtain the two-component PU / SIS injectable hydrogel material. The two-component PU / SIS injectable hydrogel material prepared by this invention can be conveniently injected subcutaneously or deeply using a standard syringe, and can rapidly form a stable gel with excellent mechanical support and degradation resistance in situ. It can meet the requirements of an ideal soft tissue filler material and is expected to further broaden the application of SIS in medical aesthetic soft tissue filling and repair.

The invention relates to the technical field of phase change heat storage, in particular to a long-short time flexible phase change heat storage device capable of spontaneously crystallizing. Comprising a box body, a crystallization module, a heat exchange module and a central controller. The crystallization module comprises a tank body with an openable inner wall, a built-in grinding body and is connected with the box body through a seed crystal circulating pump, the heat exchange module comprises a heat exchange pipe disc and a heat release circulating pump, and the central controller divides a region corresponding to the temperature sensor into a phase change region volume through the region division module; the comprehensive analysis module determines the overall phase change completion degree according to the phase change state of each region; the heat storage regulation and control module regulates the rotating speed of a heat release circulating pump according to the phase change completion degree; the heat release regulation and control module regulates the rotating speed of the pump or the opening degree of the inner wall of the tank body according to the heat power difference; the regulation and control detection module evaluates the regulation and control effect through the solid phase change rate; the optimization module adjusts the grinding rotating speed or the pump rotating speed according to the solid phase change rate difference value. According to the invention, seed crystals are spontaneously generated, and a long-time and short-time heat storage mode is carried out according to different heat use scenes.