Preparation method for polyethylene glycol/silicon dioxide/expandable graphite composite shape-stabilized phase change material

Abstract

The present invention relates to the technical field of phase change energy storage, and provides a preparation method for a polyethylene glycol/silicon dioxide/expandable graphite composite shape-stabilized phase change material. The preparation method comprises: firstly, preparing expandable graphite with a microporous structure as a composite material inorganic carrier by adopting a thermal expansion method; then, uniformly mixing molten polyethylene glycol with the inorganic carrier, and dropwise adding silicon dioxide sol prepared by a hydrolysis method into the mixture of polyethylene glycol sol and expandable graphite; and finally, carrying out infiltration, encapsulation, and formalization under a vacuum condition . The preparation method has the effects and beneficial effects that the prepared composite phase change material can ensure high energy storage performance, carries out good encapsulation on a working medium polyethylene glycol and effectively prevents liquid phase leakage; the polyethylene glycol family is wide in working temperature range, so that the applicability is wide; and furthermore, due to the high thermal conductivity of the expandable graphite, the thermal conductivity of the composites is greatly improved. This preparation method provided by the invention is simple in process, stable in performance, and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of phase change energy storage, and in particular relates to a preparation method of a polyethylene glycol / silicon dioxide / expanded graphite composite phase change shape-setting energy storage material. Background technique [0002] In the current society where the economy is developing rapidly and resources are gradually scarce, human beings have begun to develop the value of clean energy such as solar energy and wind energy. However, due to the instability and low energy density of these energy sources, their use is limited. Phase change energy storage technology achieves energy absorption and release through phase change materials, and has the function of temperature control, which makes up for the defects of clean energy and has been developed rapidly. Among them, polyethylene glycol is an organic compound with stable performance, high latent heat value, non-toxic, non-irritating, slightly bitter taste, ...

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Problems solved by technology

[0003] University of Electronic Science and Technology of China master's degree thesis "PEG / SiO prepared by sol-gel method 2 Research on shape-setting phase-change materials” mentioned that the composite phase-change shape-setting energy storage material of polyethylene glycol and silica prepared by the sol-gel method has a high latent heat value and good shape-setting effect, but its 0.45w The low thermal conductivity of / (m.k) greatly limits the application of this material in engineering practice

[0004] Wuhan University of Technology Ph.D. graduate thesis "Preparation, performance and phase change heat transfer process of polyethylene glycol-based composite heat storage materials" mentioned the composite phase change of polyethylene glycol and expanded graphite prepared by physical adsorption method Although the energy storage material has a high latent heat value and greatly improves the thermal conductivity of the composite material, the liquid phase leakage of this composite material occurs after multiple thermal cycles in engineering applications, and the material setting effect is not ideal. Pollution of the working environment, the efficiency is greatly reduced, obviously not ideal

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