Hybrid shell microcapsule-polyurethane phase change composite material

Abstract

The invention belongs to the technical field of phase-change materials, and particularly relates to a hybrid shell microcapsule-polyurethane phase-change composite material, which is prepared by the following steps: (1) mutually dissolving octadecane, tetraethyl orthosilicate and azodiisobutyronitrile with a certain core-wall ratio at 20-40 DEG C to prepare an oil phase, uniformly mixing deionized water, absolute ethyl alcohol, hexadecyl trimethyl ammonium bromide and hydroxyethyl methylacrylate to prepare a water phase, pouring the oil phase into the water phase, and homogenizing after the oil phase is clarified and transparent to obtain a miniemulsion; (2) pouring the miniemulsion into a three-neck flask, dropwise adding an ammonia water dilute solution, carrying out oil bath heating reaction for 2-4 hours at the temperature of 30-40 DEG C, introducing nitrogen for 30-40 minutes, heating to 60-80 DEG C, carrying out reaction for 2-4 hours, cooling the emulsion to room temperature, carrying out suction filtration, washing with deionized water to remove the surfactant, and freeze-drying to obtain microcapsules; and (3) adding microcapsules into a polyurethane prepolymer while stirring, uniformly mixing, adding a cross-linking agent and a catalyst, pouring into a polytetrafluoroethylene mold, and curing at room temperature to obtain the hybrid shell microcapsule-polyurethane phase change composite material.

Description

technical field [0001] The invention belongs to the technical field of phase change materials, and in particular relates to a hybrid shell microcapsule-polyurethane phase change composite material. Background technique [0002] Energy conservation and environmental protection are the focus of energy research. With the excessive use of chemical energy fuels, their non-renewability and continuous greenhouse gas emissions have led researchers to try various methods to find alternatives to traditional fossil energy sources. Thermal energy storage (TES) has an efficient energy storage method and recovery efficiency. As a new energy storage method, the purpose of energy storage is achieved by changing the material form of phase change materials (PCM) to absorb or release energy. PCM is mainly divided into three conversion modes: solid-gas, solid-liquid and liquid-gas. Solid-gas and liquid-gas release a large amount of gas during energy conversion, which is not conducive to ener...

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Problems solved by technology

[0004] Polyurethane (PU) rubber is a kind of polymer rubber with high density, high hardness, good elasticity and good biocompatibility, but the yellowing problem of polyurethane and the weak interaction between macromolecules lead to poor performance. The mechanical properties limit its application

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