Low temperature phase change cold storage material and preparation method thereof

Abstract

The invention discloses a low-temperature phase change cold storage material and a production method thereof. The low-temperature phase change cold storage material is made from, by weight, 5% to 18% of sodium chloride, 4% to 17% of potassium nitrate, 74% of water, 1% of sodium tetraborate, 1% of sodium benzoate, and 2% of polyvinyl alcohol. The phase change temperature of the low-temperature phase change cold storage material is -20 DEG C to -25 DEG C; the low-temperature phase change cold storage material is suitable for cold-storage transportation of frozen foods, cold storage density per unit mass is high, and latent heat of phase change is above 260kJ / kg. The low-temperature phase change cold storage material has the advantages that the matching of ingredients is simple, the range of sources is wide, and the preparing method is easy to operate and suitable for industrial popularization.

Description

Technical field [0001] The invention relates to a cold storage material and a preparation method thereof, in particular to a low-temperature phase change cold storage material and a preparation method thereof. Background technique [0002] The cold storage transport box is an efficient and green logistics technology developed from developed countries in the early 1980s. Its biggest advantage is: after adopting the cold storage transport box, only ordinary container trucks can be used, and no mechanical refrigeration can be used to achieve long-term cold storage, and it can realize the mixed transportation of normal temperature, frozen, and refrigerated goods in the same vehicle, making full use of freight in the same direction ability. [0003] During refrigerated transportation, the environment in the vehicle must be controlled to be as consistent as possible with the best requirements of the food being transported, and temperature fluctuations should be avoided as much as possib...

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Problems solved by technology

The phase change temperature of the cold storage material provided in the above-mentioned patent is similar to that of the present invention, but the latent heat of phase change is lower

In addition, according to the feedback from the merchants of insulated refrigerated vehicles, the use of inorganic salt phase-change cold storage materials with sodium chloride, ammonium chloride and other chloride salts as the main material, although it has a high phase-change latent heat and thermal conductivity, is actually used in production. During the process, even if stainless steel is used as the container for the inorganic salt phase change material, the container will be severely corroded within a month, and the phase change material will leak

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