Phase-change heat-storage material and preparation method thereof

Abstract

The invention discloses a phase-change heat-storage material and a preparation method thereof. The phase-change heat-storage material is prepared from a main heat agent, a nucleating agent, an anti-crystallizing agent, a thickener and a solvent, wherein the main heat agent is 75-85% of sodium sulfafe decahydrate, the nucleating agent is 3-5% of borax; the weight percent of the anti-crystallizing agent is 3-5%; the weight percent of the thickener is 1-3%; and the solvent is 8-10% of water. The preparation method comprises the following steps of a, adding water, the anti-crystallizing agent, the nucleating agent and the thickener to a clean plastic bucket to evenly agitate, and agitating the components into a uniform viscous mixture; b, grinding, sieving and sorting the sodium sulfafe decahydrate taken as the main heat agent, so as to form uniform fine sand, and adding to the mixture to evenly agitate, so that each component is evenly dispersed. The phase-change heat-storage material forms a colloid state after heat-absorption and phase-change; the phase-change times are more; and an over-cold problem is not easily generated.

Description

technical field [0001] The invention relates to the technical field of energy saving, in particular to a phase change heat storage material and a preparation method thereof. Background technique [0002] Phase change materials refer to substances that change shape with temperature changes and can provide internal latent heat. The process of phase change materials changing from solid to liquid or from liquid to solid is called a phase change process. At this time, the phase change material will absorb or release A large amount of latent heat, so phase change materials can actually act as energy storage. This feature is of great significance in the fields of energy saving and temperature control. The existing phase-change low-temperature energy storage materials use sodium sulfate decahydrate (Na 2 SO 4 10H 2 O) is the main raw material, and its calorific value per unit mass of energy storage is extremely large, about 241 joules / g. However, Na 2 SO 4 10H 2 The dissoluti...

AI Technical Summary

Problems solved by technology

The existing phase-change low-temperature energy storage materials use sodium sulfate decahydrate (Na 2 SO 4 10H 2 O) is the main raw material, and its calorific value per unit mass of energy storage is extremely large, about 241 joules / g. However, Na 2 SO 4 10H 2 The dissolution process of O belongs to heterogeneous dissolution, which has serious supercooling and phase separation phenomenon, and pure Na 2 SO 4 10H 2 After three or four thermal cycles, obvious stratification will appear in the system, and its phase change enthalpy will also decay. In other words, inorganic hydrated salts have the advantages of large energy storage, low cost, safety and non-toxicity, and have great potential. use value

At the same time, inorganic hydrated salts have the disadvantages of large undercooling and easy phase separation, which limit their use.

At present, the main problem of phase change materials is that the crystal particles are large, and they are usually in a liquid state after the endothermic phase transition. The number of phase transitions is relatively small, and some irregular blocks with a diameter of about 20 mm or more will be formed after several phase transitions. material, which greatly affects its energy storage effect and service life