Composite phase change cold storage material for cold storage and preservation

Abstract

The invention discloses a composite phase change cold storage material for cold storage and preservation. The material is prepared from, in percentage by mass, 0.8%-7% of sorbitol, 0.01%-0.1% of borax and the balance of water through mixing. Sorbitol, borax and water are poured in a container to be mixed, uniformly stirred and left to stand for 2-5 min. The material has unobvious degree of supercooling and stable chemical properties, raw materials are widely sourced, lower in cost, non-toxic and harmless and the composite phase change cold storage material is convenient to prepare. The material has a wide application range, is particularly suitable for cold storage and preservation of food, fruits, vegetables and the like during long-distance transport as well as cold storage field of vaccines and has certain application potential in cold storage and transport.

Description

technical field [0001] The invention relates to the technical field of phase change materials, in particular to a composite phase change cold storage material for cold storage and preservation. 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 fresh products such as vegetables and fruits, phase-change cooling agents play an important role in the process of refrigerated transportation and distribution. It plays an indispensable role 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 salt hydrate as an inorganic phase-change cooling storage agent. Its latent heat of phase change is large, but there are serious phase separation and high supercoolin...

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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 salt hydrate 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 preparation operations are complicated, as recorded in the patent CN85108305, its refrigeration substance is a mixture of ice, salt or ice, calcium chloride or a mixture of ice, salt, and calcium chloride, although it has a low cost , simple processing, etc., but its refrigeration effect is not ideal, and it is corrosive to the container, which also limits its application; another example is the cold storage phase change material formula disclosed in the patent CN102942905A with a phase change temperature of about -15°C , the medicines used include ammonium chloride, dipotassium hydrogen phosphate, sodium hydroxyethyl cellulose, nano-titanium dioxide, deionized water, etc. There are many kinds, and the preparation process is cumbersome; the extra medicines added do not contribute too much to the cold energy stored in the material , some additions actually reduce the latent heat of phase change of raw materials

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