Composite phase-change cold storage material hydrogel as well as preparation method and application thereof

Abstract

The invention discloses a composite phase-change cold storage material hydrogel as well as a preparation method and application thereof. The composite phase-change cold storage material hydrogel comprises the following components in parts by mass: 20-30 parts of polyvinyl alcohol, 2-3 parts of a water-based defoaming agent, 1-2 parts of a thickening agent, 8-15 parts of 8-15% potassium chloride solution, 80-120 parts of 8-12% sodium tetraborate solution and 400-600 parts of water. The preparation method comprises the following steps: respectively adding the water-based defoaming agent, the thickening agent and the potassium chloride solution into the polyvinyl alcohol solution; uniformly mixing the raw materials, adding the sodium tetraborate solution, quickly stirring at 90-100 DEG C for30-60 seconds until sufficient chemical crosslinking to obtain polyvinyl alcohol hydrogel, carrying out heat preservation in a water bath to remove bubbles, repeatedly freezing and unfreezing for 1-3times, and carrying out physical crosslinking to obtain the composite phase-change cold storage material hydrogel. The product is pollution-free and non-corrosive, the gel can be repeatedly used for multiple times, the degree of supercooling is small, no obvious phase separation exists, the latent heat of phase change is large, the cold insulation time is long, and the gel is comfortable to wear when being used for cooling clothes.

Description

technical field [0001] The invention belongs to the technical field of cold storage materials, and in particular relates to a composite phase change cold storage material hydrogel and a preparation method and application thereof. Background technique [0002] Since the 1930s, especially affected by the energy crisis in the 1980s, the basic theory and application technology research of phase change heat storage (LTES) has risen rapidly and developed continuously in developed countries (such as the United States, Canada, Japan, Germany, etc.) Because with the rapid development of science and technology, energy has gradually become the basis for human survival, but the supply and demand of energy have a strong timeliness, in order to improve energy utilization efficiency, protect the environment, and solve the mismatch between heat supply and demand In the utilization of solar energy, "shifting peaks and filling valleys" of electricity, waste heat recovery and utilization, and ...

AI Technical Summary

Problems solved by technology

[0006] Unlike liquid materials such as air conditioners and refrigerators that require rapid cold storage, cooling vests need to have a strong cold storage timeliness. However, most of the cooling vests made of existing cold storage materials have insufficient cold storage capacity, short cold storage time, poor economic benefits or human comfort. Therefore, the research at this stage is devoted to improving the formula of cold storage materials, optimizing the preparation process, increasing the amount of cold storage, improving the cold storage time and the personal comfort of products after freezing