Preparation method of silicon dioxide coated crystal water-salt phase-change material microcapsules

Abstract

The invention discloses a preparation method of silicon dioxide coated crystal water-salt phase-change material microcapsules. The preparation method comprises the steps of regulating the pH of saturated crystal water and a salt solution to the range of 8-10, mixing the saturated crystal water and the salt solution with a surfactant and an organic solvent and stirring for 2-3 hours at a temperature within the range of 40-50 DEG C, thereby obtaining a W / O emulsion, next, dropwise adding a silicon dioxide precursor to the obtained emulsion and stirring for reacting at a room temperature for 20-30 hours, and finally, centrifuging, washing and drying the precipitate obtained through the reaction, thereby obtaining the finished product. The preparation method is simple in process and does no need high-temperature calcination; the preparation process is safe, and the obtained microcapsules are good in tightness and easy to adjust in particle size. The crystal water and the salt are taken as the core materials, and compared with other phase-change materials, the core materials are easily available and low in prices and have great latent heat of phase change.

Description

technical field

[0001] The invention belongs to the technical field of composite materials, and in particular relates to a method for preparing microcapsules of crystal water and salt phase-change materials wrapped in silicon dioxide. Background technique

[0002] Because phase change heat storage materials are generally accompanied by large energy absorption or release during the phase change process, and have the characteristics of maintaining an approximately isothermal process, they provide a broad basis for the application of thermal energy storage and can be used commercially. To a certain extent, it solves the contradiction of energy utilization mismatch in time and space. Among the existing phase change materials, hydrated salt phase change materials have been widely concerned due to their characteristics of cheap price, large heat of solution, wide application range, large heat of solution and fixed melting point. Such phase change materials mainly include halides,...

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