Composite low-temperature coolant and preparation method and applications thereof

Abstract

The invention discloses a composite low-temperature coolant which is composed of the following components in percentage by mass: 7-12% of ethylene glycol, 3-6.3% of ammonium chloride, 3-7% of sodium chloride, 4-7% of calcium chloride, 0.05-2% of guar gum, 0.1-0.5% of a citric acid, 1-3% of sodium tetraborate and the balance of water. The invention also discloses a preparation method of the composite low-temperature coolant. The invention also discloses the applications of the composite low-temperature coolant on the aspects of storage and freshness preservation. The preparation method of the composite low-temperature coolant disclosed by the invention is simple, low in cost, and suitable for mass production, and the prepared coolant is good in cool storage effect and can be used repeatedly. Experiments show that the phase transition temperature of the coolant is 34 DEG C below zero-38 DEG C below zero, and the latent heat of phase change is 310-355 kJ / kg.

Description

technical field [0001] The invention relates to the field of cold storage agent preparation, in particular to a composite low-temperature cold storage agent and its preparation method and application. Background technique [0002] With the development of society and the improvement of people's living standards, people's requirements for the quality of fresh food and other products are also increasing. Therefore, food storage and preservation technology is particularly important in cold chain logistics. With the development of domestic cold chain logistics, the research on cold storage technology has gradually deepened, and the research on cold storage agent is also being carried out as a hot spot. The purpose of cold storage is achieved by absorbing or releasing a large amount of heat during the phase change process of cold storage agent. [0003] According to literature records, the current low-temperature cooling agents are mainly divided into: organic cooling agents and ...

AI Technical Summary

Problems solved by technology

At present, inorganic cooling agents are widely used, and the most well-known one is ice. Ice storage has a certain effect, but it is mainly suitable for products stored at around 0°C. If you want to store products at lower temperatures, you need to use other inorganic salts. Many inorganic substances The phase change cold storage agent has the disadvantages of supercooling and phase separation during the phase change process, which affects the cold storage capacity

Organic phase-change cold storage materials mainly include fatty acids and their esters, alcohols, aromatic hydrocarbons, and high-molecular polymers. The chemical properties of organic matter are stable and there is no disadvantage of phase separation, but the thermal conductivity is low and the latent heat of phase change is low.