Phase change energy storage microcapsule taking polyurethane modified organic silicon resin as shell material and preparation method of phase change energy storage microcapsule

Abstract

The invention relates to a phase change energy storage microcapsule taking polyurethane modified organic silicon resin as a shell material and a preparation method of the phase change energy storage microcapsule, and particularly discloses the preparation method which comprises the following steps: (1) uniformly mixing monomers for generating organic silicon resin, adding a catalyst, and prepolymerizing to obtain a prepolymer of polysiloxane; (2) adding the polyurethane prepolymer into the step (1), and carrying out a reaction to obtain a polyurethane modified organic silicon resin prepolymer;(3) uniformly mixing a core material with the shell material prepolymer to obtain a core material and shell material prepolymer mixture; (4) preparing an aqueous solution of a surfactant; and (5) mixing and emulsifying the core material and shell material prepolymer mixture and the aqueous solution of the surfactant to obtain an emulsion, adding a catalyst until the reaction is finished, separating, and drying to obtain the polyurethane modified organic silicon resin shell phase change energy storage microcapsule. The method is green, pollution-free and simple to operate, and the obtained microcapsule is smooth in surface, good in compactness, adjustable in phase change temperature, controllable in particle size, good in heat resistance and high in phase change enthalpy value.

Description

technical field [0001] The invention belongs to the technical field of phase change energy storage, and in particular relates to a phase change energy storage microcapsule with a polyurethane modified silicone resin as a shell material and a preparation method thereof. Background technique [0002] Phase change energy storage technology is the application of microcapsule technology to coat a layer of stable film on the surface of solid-liquid phase change energy storage material particles to form a composite phase change energy storage material with a "core-shell" structure. Phase change energy storage materials will have problems of leakage, volume change and easy corrosion during application, so it is necessary to microencapsulate phase change energy storage materials. [0003] The shell materials of phase change energy storage microcapsules can usually be divided into organic shell materials and inorganic shell materials. It is coated with variable energy storage materia...

AI Technical Summary

Problems solved by technology

The inorganic material calcium carbonate is used as the shell material. The phase-change energy storage microcapsules have poor shell toughness and are easy to break during processing, and calcium carbonate is not acid-resistant and easy to degrade in an acid environment. Agglomeration phenomenon, unable to form powder with uniform particle size when dry

[0005] For example, the phase-change energy storage microcapsule reported in the patent publication number CN109868116A uses melamine-formaldehyde resin as the shell material. It can be seen from the SEM image that the microcapsules have a large number of broken shells, indicating that the toughness of the shell material is not enough. At the same time, the phase change energy storage microcapsules of the shell material have carcinogen formaldehyde in the production and use process, which is easy to cause environmental pollution and cause physical harm to operators and users.

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