Phase change energy storage material

Abstract

The invention discloses a phase change energy storage material which is a microcapsule material formed by radiation polymerization of a higher fatty acid oil-in-water emulsion and a melamine prepolymer solution. The higher fatty acid oil-in-water emulsion comprises deionized water, 95wt% of higher fatty acid, 2wt% of graphite, 1.5 wt% of span 20 and 1.5 wt% of Tween 20, with the sum of the weightpercentages of the components being 100%, and the ratio of the total weight of the components to the volume of the deionized water is 1g to 10ml. Compared with the prior art, the microcapsules of thephase-change energy storage material retain the phase-change temperature suitable for fatty acid substances, namely the phase-change temperature range is about -10 DEG C to 74 DEG C, the defects thatleakage is likely to happen during traditional solid-liquid phase change and the like are overcome, and the phase change energy storage material has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of chemical materials, in particular to a phase change energy storage material. Background technique [0002] Energy shortage and environmental pollution require people to actively develop new renewable clean energy on the one hand, and to improve the utilization efficiency of existing energy on the other hand, including energy-saving technologies, and phase change materials are widely used in improving energy utilization efficiency and energy-saving technologies . Fatty acids and their derivatives have many advantages as common energy storage and heat storage phase change materials: moderate melting point, low price, low corrosion, not suitable for supercooling, difficult to occur phase separation, and high thermal stability. However, they also have obvious shortcomings in application: first, the thermal conductivity is not high enough, and graphite or expanded graphite can usually be added to enhance its ...

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Problems solved by technology

However, they also have obvious shortcomings in application: first, the thermal conductivity is not high enough, and graphite or expanded graphite can usually be added to enhance its thermal conductivity; second, as a phase change material, when a solid-liquid phase transition occurs during use Easy to leak, there are public patents on the problem of easy leakage, such as patent number CN110643329A, which uses fly ash to absorb fatty acids to prepare composite phase change materials, CN109678423A and CN110157387A to use vermiculite to absorb fatty acids to prepare composite phase change materials, and CN109054769A, CN110257017A and CN110257017A and CN110373163A adopts expanded graphite to absorb fatty acid to prepare composite phase change material. The existing carriers for adsorbing fatty acid are fly ash, vermiculite and expanded graphite. Their surfaces and inner bodies all contain a large number of small pores, which can absorb and accommodate heating. Fatty acids that are liquid under certain conditions to prepare composite phase change materials

However, since the above pores are open and the phase change material is not firmly sealed, the composite phase change material will inevitably leak during use, which cannot completely solve the leakage defect of fatty acids during the solid-liquid phase transition process. Therefore the above scheme is not ideal and needs to be improved

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