Inorganic nano phase-change energy storage material prepared by double-decomposition reaction and preparation method thereof

Abstract

The invention relates to an inorganic nano phase-change energy storage material prepared by double-decomposition reaction, belonging to the technical field of architectural low-carbon energy saving. The energy storage material is prepared from aluminum sulfate O and trisodium phosphate (Na3PO4) in a mol ratio of 1.1:2. The X-ray diffraction analysis indicates that the product is composed of the following components in percentage by mol: 39.2% of nano aluminum phosphate AlPO4, 58.8% of sodium sulfate Na2SO4.10H2O and 2% of aluminum sulfate Al2(SO4)3.18H2O. The size of the product is 40-60nm, the phase-change temperature by DSC (differential scanning calorimetry) thermal analysis is 26 DEG C, the melting-solidification curve proves to have no problems of supercooling and phase separation, the heat storage density is 320J / g, and the density is 1.8 g / cm<3>. The product has the advantages of simple technique, repeated use and no phase separation; the inorganic salt hydrate is quickly dispersed into nano particles through the rapid reaction and wrapped by the aluminum phosphate, so that the inorganic salt crystalline water can not be easily lost, and the molecular motion of the particles is restricted, thereby effectively controlling the phenomena of supercooling and phase separation; and thus, the invention provides a favorable phase-change energy storage material.

Description

technical field [0001] The invention belongs to the technical field of low-carbon and energy-saving buildings, and specifically relates to an inorganic nano-phase-change energy storage material prepared by metathesis reaction and a preparation method thereof. Background technique [0002] A large amount of heat is generated in the natural environment every day, such as: solar energy, animal body radiation heat, combustion heat, friction heat, object running heat, etc. Phase change energy storage materials are substances that absorb the heat during the phase change process, and release it to the environment when needed, so as to achieve the purpose of controlling the ambient temperature and saving energy. According to its chemical composition, it can be divided into: organic phase change energy storage materials, hybrid phase change energy storage materials and inorganic phase change energy storage materials. Organic phase change energy storage materials have the advantages ...

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Problems solved by technology

In order to solve the above problems, various inventors have proposed various schemes, such as "A Heat Storage Medium and Its Application", application number 200610104583.8, which proposes a salt water compound composed of magnesium nitrate, magnesium chloride and water to form a eutectic; "An Inorganic Phase Change Storage Medium" Energy Materials", application number 201210037753.0, using nucleating agent and dispersant in inorganic salt hydrate; "A preparation method of inorganic hydrate salt phase change energy storage material", application number 200810065301.7, using Add anti-supercooling agent sodium tetraborate, although these methods have some effects, they are only limited to certain systems, and there are certain limitations in the selection and use of phase change energy storage materials. The inventors of the present invention have found that the inorganic salt hydration Phase-change energy storage materials are dispersed into nano-sized particles and wrapped into nano-microcapsules, which can well solve the problems of supercooling and phase separation of phase-change energy storage materials. Based on this discovery and idea, the inventor has developed a series of nano-inorganic Phase change energy storage material, the present invention is exactly one of this inorganic phase change energy storage material developed

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