Composite phase-change material used at temperature of 2-8 DEG C and preparation method thereof

Abstract

The invention discloses a method for preparing a composite phase-change material used at a temperature of 2-8 DEG C. The method comprises the following steps of: (1) placing an anhydrous-sodium-sulfate raw material in a blast drying oven, and drying to be constant weight at a temperature of 90-110 DEG C; (2) according to the parts by mass of all raw materials, respectively weighing 30-50 parts ofanhydrous sodium sulfate, 5-10 parts of sodium chloride, 10-20 parts of potassium chloride, 10-20 parts of ammonium chloride, 1-5 parts of boric acid, 1-5 parts of borax, 0.5-5 parts of sodium carboxymethyl cellulose, 0.5-5 parts of hydrophilic aerogel for mixing, grinding in a ball grinder till the granularity of the mixture is 50-300mu m; (3) adding 20-50 parts of distilled water into the groundmxiture, stirring to be fused slurry at a temperature of 40-60 DEG C. The method disclosed by the invention has the advantages of simple process and lower cost; the prepared phase-change material hasthe advantages of low supercooling degree, high energy-storage density, no-phase separation, stable property and capabilities of fast cold storage and slow cold release.

Description

Technical field [0001] The invention belongs to the field of phase change materials, and specifically relates to a 2-8°C composite phase change material and a preparation method thereof. Background technique [0002] Phase change material (PCM) refers to a substance that changes the state of a substance with temperature changes and can provide latent heat. The process of transforming its physical properties is called a phase change process. At this time, the phase change material will absorb or release a large amount of latent heat. For solid-liquid phase change materials, the mechanism of action is: when the phase change material transforms from liquid to solid, the material releases heat to the environment, on the contrary, absorbs heat from the environment, and the energy stored or released when the physical state changes is called Latent heat of phase change. The temperature range of the phase change is very narrow. When the physical state changes, the temperature of the mat...

AI Technical Summary

Problems solved by technology

The preparation of composite energy storage materials can effectively solve the various deficiencies in the practical application of solid-liquid PCM: such as the change of volume expansion and contraction during phase transition, the generation and leakage of liquid, the small thermal conductivity of organic materials, and the easy Oxidation, layering of inorganic hydrated salts, corrosion, etc. However, when adding other functional materials, the storage energy of the phase change material will be reduced

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