Composite shape-stabilized phase change material and preparation method thereof

Abstract

The invention provides a composite shape-stabilized phase change material. The phase change material is a crystallized hydrated salt phase change material, and a support material is meerschaum. A preparation method of the phase change material comprises the following steps: performing acid treatment, high-temperature treatment and organic treatment on the meerschaum in sequence; performing an adsorption reaction on the treated meerschaum and a saturated aqueous solution of a crystallized hydrated salt under a vacuum condition to obtain a novel composite shape-stabilized phase change material. The composite shape-stabilized phase change material has the advantages that 1) packaging and shape stabilizing of the phase change material are realized through the porous structure of the meerschaum, the loss of phase change material crystal water is limited successfully through a functional group of the meerschaum, phase separation is reduced, and the crystallization performance and phase change energy storage feature of the crystallized hydrated salt phase change material are ensured; 2) raw materials of the support material and the phase change material are low in prices and readily-available; the composite preparation method is simple and convenient. By adopting the composite shape-stabilized phase change material and the preparation method, the phase separation phenomenon, overcooling phenomenon and leakage are reduced, and the stability of the phase change material in a long-term use process is improved; the phase change material has a wide application prospect in the phase change heat storage field.

Description

technical field [0001] The invention relates to a phase-change heat storage material, in particular to a composite shape-fixed phase-change material and a preparation method thereof. [0002] technical background [0003] Energy is the basis for the survival and development of human beings. With the continuous progress of society, the situation of energy shortage is becoming more and more serious. There are two basic ways to solve this problem: one is to rely on scientific and technological progress to develop new energy; the other is to improve the utilization rate of existing energy and reduce energy consumption. Phase change material is an energy-saving and environmentally friendly material that was discovered in the 1960s and developed and applied after the 1970s. It is also a clean energy storage material. Phase change materials are substances that absorb or release a large amount of heat during the phase change process for thermal energy storage and temperature regulat...

AI Technical Summary

Problems solved by technology

Aiming at the defects of phase separation and poor thermal stability in the composite phase change material, the present invention uses sepiolite fiber as the adsorption support matrix of the phase change material, utilizes the porous structure of sepiolite to realize the encapsulation and setting of the phase change material, and utilizes its Moisture absorption and desorption properties lock the crystal water of the crystalline hydrated salt phase change material to prevent its evaporation and phase separation, improve the phase change energy storage effect and thermal stability of the phase change material, and reduce the cost of the fixed phase change material

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