Phase change heat storage material and its preparing method

Abstract

The present invention discloses the composition and preparation process of phase change heat accumulating material. The phase change heat accumulating material consists of crystalline sodium acetate, borax as additive and polyacryamide mainly. The preparation process includes grinding and mixing the said components, heating the mixture to smelting and pouring into packing container; or includes dissolving crystalline sodium acetate, adding borax via stirring, adding polyacryamide via stirring and final pouring into packing container. The phase change heat accumulating material of the present invention has the advantages of great heat accumulating amount, low supercooling degree, proper phase change temperature, no phase separation after long term use, etc.

Description

technical field [0001] The invention relates to a phase change thermal storage material and a preparation method thereof. Background technique [0002] Heat storage can solve the waste caused by the mismatch between heat energy supply and demand in terms of time and space. Heat storage technology has been widely used in air conditioning, heating and other fields. With the deepening of research, heat storage materials have gradually entered ecological buildings, etc. Emerging fields. Since the phase change heat storage material uses both the inherent heat capacity of the substance and the phase change heat of the state change to store heat energy, it has a large heat storage density. In recent years, research and application in this area have developed rapidly. The current research on phase change heat storage materials is mainly divided into two directions: organic phase change heat storage materials and inorganic phase change heat storage materials. The performance of org...

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Problems solved by technology

The performance of organic phase change heat storage materials is relatively stable, and there is almost no problem of supercooling and phase separation, but its disadvantages are also very obvious, that is, the latent heat of phase change is low, and the material density is small, resulting in the unit of organic phase change heat storage materials. The volume heat storage is small, especially compared to the high-temperature water heat storage technology that is currently being developed, the advantages of organic phase change heat storage materials in terms of heat storage per unit volume are no longer obvious

Inorganic phase change heat storage materials have high heat storage per unit volume and good thermal conductivity, but their disadvantages are that they are prone to supercooling and phase separation. If the problems of supercooling and phase separation can be solved by additives, then inorganic phase change heat storage materials It has very obvious advantages, and heat storage related industries can also be developed accordingly

At present, relevant researchers at home and abroad have done some work in this area and developed some phase change heat storage materials, some of which have been put into actual production and application, but there are still many problems: such as the developed phase change heat storage materials phase change The temperature is not suitable, resulting in too narrow use; the performance is unstable, especially the phase separation phenomenon occurs after a period of use

This invention has many merits, but there are also some shortcomings, which are mainly manifested in the high types and proportions of additives. Because additives are generally not phase change heat storage materials, or even if they are phase change heat storage materials, their phase change temperature The difference from the main material is generally large, so a higher proportion of additives will inevitably have an adverse effect on the heat storage capacity and subcooling degree of the phase change heat storage material