A low temperature storage agent

Abstract

The invention provides a low-temperature cold storage agent, which includes NaCl, NH4Cl, guar gum and water. The weight percentages of the above components are as follows: NaCl: 15%; NH4Cl: 8%; guar gum: 1%; water : 76%. When the low-temperature storage agent is prepared, first provide a container and a stirring rod, put 76% water in the container by weight; then put 15% NaCl and 8% NH4Cl in the water, and then slowly add 1% guar gum is stirred with a stirring bar at the same time until it is evenly stirred; the phase transition temperature of the low-temperature cold storage agent is -25° C., and the latent heat value is 275 (J / g). The invention has a wide application range, large heat of dissolution, high volume heat storage density, and is roughly neutral, and has the characteristics of low cost, non-toxic, harmless, green and environmentally friendly, and can prevent ice release, and is especially suitable as food and biological medicines. And cold storage agent for cold storage during cold chain transportation of vaccines.

Description

technical field [0001] The invention relates to a low-temperature cold storage agent, in particular to a low-temperature cold storage agent, which belongs to the technical field of energy storage and is mainly used in the cold chain logistics process to refrigerate items and prevent items from deteriorating due to high temperature. Background technique [0002] With the rapid development of human society, people have higher and higher requirements for the original taste of food, long-distance transportation of a large number of fresh food and native products, and small batch, multi-variety, multi-frequency, short-term delivery requirements Therefore, in recent years, the refrigerated transportation technology in the cold chain has developed rapidly. [0003] Refrigerated transportation is mainly divided into two categories: mechanical refrigerated transportation and cold storage transportation. If long-distance transportation can be realized, the cost of the latter will be ...

AI Technical Summary

Problems solved by technology

At present, there are many types of cooling agents that have been used at home and abroad, and the typical ones are polymers and eutectic mixtures. However, the known polymer cooling agents and eutectic mixtures have some defects. Patent No. It is CN200410034106.x, the patent name is the Chinese patent of high polymer cool storage agent, its preparation process is complicated, resulting in high production cost; the phase transition temperature of its formula is -5 to 0 °C, which cannot reach the low temperature required by users; The patent number is CN90109434.x, and the patent name is a Chinese patent of eutectic mixture. Its main components are water and potassium chloride, but there is no measure to prevent the phenomenon of phase transition crystal-liquid separation, that is, the phenomenon of ice release

Therefore, it is known that these two cold storage agents have poor refrigeration performance, and are prone to phase change crystal liquid separation, and are prone to deterioration of transported items due to high temperature.