A low temperature composite phase change cold storage material

Abstract

The invention relates to the field of phase-change materials, in particular to a low-temperature composite phase-change cold-storage material. The low-temperature composite phase-change cold-storage material is prepared by, by mass percentage, 43.4% of trimethylolpropane aqueous solution and 15% of ammonium chloride aqueous solution. A preparation method of the low-temperature composite phase-change cold-storage material includes: evenly mixing the trimethylolpropane aqueous solution and the ammonium chloride aqueous solution according to the mass ratio of 1:1, and standing for a certain period of time to obtain the low-temperature composite phase-change cold-storage material. The low-temperature composite phase-change cold-storage material has the advantages that the material is transparent liquid and non-corrosive; the phase-change temperature of the material is 18.42 DEG C, the phase-change latent heat is 195.3J / g, and the material hardly has super-cooling degree, is stable in chemical property, wide in raw material source, low in cost, nontoxic, harmless, convenient to prepare and suitable for industrial popularization and has certain application potential in terms of refrigerated transportation.

Description

technical field [0001] The invention relates to the technical field of phase change materials, in particular to a low-temperature composite phase change cold storage material. Background technique [0002] With the improvement of people's living standards, more and more attention is paid to the quality of fresh food. In order to ensure the quality of fresh food, especially the quality of seafood, meat and other fresh products, low-temperature phase change refrigerants are transported and distributed at low temperatures. It plays an indispensable role in the process and greatly reduces the risk of fresh food spoilage. [0003] At present, most of the researches on phase-change cooling storage agents focus on the solid-liquid phase transition. Many scholars use the aqueous solution of hydrated salt as an inorganic phase-change cooling storage agent. Its latent heat of phase change is large, but there are serious phase separation and high supercooling. problems such as tempera...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the researches on phase-change cooling storage agents focus on the solid-liquid phase transition. Many scholars use the aqueous solution of hydrated salt as an inorganic phase-change cooling storage agent. Its latent heat of phase change is large, but there are serious phase separation and high supercooling. problems such as temperature, and the change of phase transition temperature is irregular, which is not conducive to adjustment. As recorded in the patent CN85108305, the refrigerating substance is a mixture of ice, salt or ice, calcium chloride or ice, salt, and calcium chloride. Although it has the advantages of low cost and simple processing, its refrigeration effect is not ideal, and it is corrosive to the container, which also limits its application; for example, the phase transition temperature disclosed in patent CN102942905A The formula of cold storage materials at -15℃, the drugs used include ammonium chloride, dipotassium hydrogen phosphate, sodium hydroxyethyl cellulose, nano-titanium dioxide, deionized water, etc. There are many types, and the preparation process is cumbersome; the added drugs are mainly used To reduce the supercooling degree of cold storage materials and weaken phase separation, it does not contribute much to the storage of cold energy in materials, and some additions reduce the latent heat of phase change of raw materials

Images