Function enhanced metal organic framework-based composite phase change material and preparation method thereof

Abstract

The invention relates to a function enhanced metal organic framework-based composite phase change material and a preparation method thereof. The preparation method comprises the following steps: mixing a metal organic framework material, copper nitrate, an organic ligand and silver nitrate to form a precursor solution, heating the precursor solution to a certain temperature and performing heat preservation and carrying out a reaction for a period of time, performing cooling to room temperature after the reaction is completed, performing filtering, sequentially performing washing, centrifugal separation, drying on a first filter residue obtained by filtration and then performing dispersion in an acid solution, performing stirring for a period of time, performing filtering, sequentially performing washing and drying on a second filter residue obtained by filtration and then performing dispersion in a second organic solvent, performing stirring under ultraviolet irradiation for a period of time, performing filtering, performing washing and drying on a third filter residue obtained by filtration to obtain a metal organic framework, and compounding an organic phase change core materialwith the metal organic framework to obtain the composite phase change material. The acid sensitivity of the metal organic framework material is utilized to remove the metal organic framework materialthrough the acid solution, and thereby an adjustable pore size is realized.

Description

technical field [0001] The invention relates to a phase-change material, in particular to a function-enhanced metal-organic framework-based composite phase-change material and a preparation method thereof. Background technique [0002] As a solid-liquid phase change material, organic phase change materials have the advantages of no overcooling, corrosion, etc., low price, and easy acquisition, and have attracted extensive attention from researchers in the field of energy storage. However, there are two major difficulties in the application of organic phase change materials. First, most organic phase change materials belong to the category of solid-liquid phase change materials. After absorbing heat, the materials are in a liquid state, and their fluidity limits their application; The thermal conductivity of variable materials is generally small, generally in the range of 0.15 to 0.3 W m -1 ·K -1 , affect the material storage and heat release speed, and affect the use. [...

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Problems solved by technology

However, there are two major difficulties in the application of organic phase change materials. First, most organic phase change materials belong to the category of solid-liquid phase change materials. After absorbing heat, the materials are in a liquid state, and their fluidity limits their application; The thermal conductivity of variable materials is generally small, generally in the range of 0.15 to 0.3 W m -1 ·K -1 , affecting the material storage and heat release rate, affecting the use

[0003] Most metal-organic frameworks currently used as shape-changing substrates are microporous. Microporous MOFs are beneficial to the adsorption and separation of small molecules, but prevent macromolecules from entering the pores of MOFs. Most organic phase-change materials are macromolecules, which are not easy to enter Porous MOFs substrate channels affect the loading rate of the phase change core material, thereby affecting the phase change temperature and phase change enthalpy; the thermal conductivity of metallic silver in traditional metal materials is theoretically as high as 400W m -1 ·K -1 , is a representative metal material with high thermal conductivity

In existing patents [CN201510029947] or literature reports, traditional impregnation and chemical reduction methods are used to prepare metal-nanoparticle-reinforced metal-organic frameworks, which are prone to agglomeration and uneven distribution of metal nanoparticles, resulting in poor thermal conductivity of the material. not much improvement

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