Composite phase change material with high thermal conductivity and preparation method thereof

Abstract

The invention belongs to the technical field of composite materials and discloses a composite phase change material with high thermal conductivity and a preparation method thereof. The composite phase change material comprises a surface modified carbon-based nanometer thermal conductive filler and aliphatic acid. The surface modified carbon-based nanometer thermal conductive filler is one of surface modified nano-graphite flake, graphene or carbon nanotube. The aliphatic acid is one component selected from decylic acid, decanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid and arachidic acid or a mixture of two components selected from decylic acid, decanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid and arachidic acid. The preparation method comprises the following steps: carrying out surface modification on a carbon-based nanometer thermal conductive filler by the use of melamine, sodium humate or dopamine and adding the surface modified carbon-based nanometer thermal conductive filler into a aliphatic acid melt; and uniformly mixing for melt blending and introducing the melt blending product into a mold, and carrying out curing molding so as to obtain the composite phase change material with high thermal conductivity. The composite phase change material with high thermal conductivity has excellent thermal conductivity and stable performance, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a high thermal conductivity composite phase change material and a preparation method thereof. Background technique [0002] With the increasing demand for energy in modern society and the depletion of fossil fuels, thermal energy storage technology, as a new technology to improve energy utilization, has been developing rapidly like never before. Commonly used phase change energy storage materials mainly include paraffins, organic fatty acids and inorganic hydrated salts. Among them, organic fatty acids are popular because of their high melting enthalpy, no supercooling and precipitation, non-toxic and non-corrosive, small volume expansion rate during solid-liquid phase transition, stable performance, and low price. However, the low thermal conductivity of fatty acid phase change materials makes the heat transfer performance of the heat storage system poor...

AI Technical Summary

Problems solved by technology

However, there are the following main problems in the prior art: (1) the poor dispersion of carbon-based nano-fillers leads to limited thermal conductivity enhancement effect, and the thermal conductivity of composite phase change materials needs to be further improved; (2) due to the compatibility of carbon-based thermal conductive fillers with fatty acids Poor performance, easy to agglomerate during thermal cycle, leading to failure of thermal conductivity of composite phase change materials during use, limiting its use