Nano-metal composite phase change material and preparation method thereof

Abstract

The invention belongs to the technical field of phase change materials. The invention provides a nano-metal composite phase change material and a preparation method thereof. The preparation method comprises the steps of S1, in a weak acid environment, mixing expanded graphite and nano-metal, conducting ball milling and annealing treatment in sequence, and acquiring a heat conduction enhanced material, S2, pre-dispersing a carbon material to obtain a shaped material, and S3, dispersing the heat conduction enhanced material and the shaped material in liquid paraffin, performing heating reaction, performing high-temperature curing, and performing cooling to obtain the nano-metal composite phase change material. The nano-metal is uniformly adsorbed in a heat-conducting network of the expanded graphite, so that the problem of sedimentation and agglomeration of the nano-metal can be prevented, and the latent heat value of the composite phase change material is greatly improved; the carbon material is adopted as a shaped material to be mixed with the heat conduction enhanced material, a closed three-dimensional network structure can be formed and firmly covers the composite phase change material, crack diffusion and fracture in the composite phase change material are effectively avoided, and the leakage problem is prevented.

Description

technical field [0001] The application belongs to the technical field of phase-change materials, and in particular relates to a nano-metal composite phase-change material and a preparation method thereof. Background technique [0002] With the continuous development of modern society, the use of cars is becoming more and more popular. However, traditional fuel vehicles can no longer meet the requirements of modern social development. The exhaust gas produced by fuel vehicles has caused irreversible damage to the ecological environment. At the same time, fuel vehicles are also consuming a large amount of non-renewable resources. The shortage of energy resources has restricted the development of fuel vehicles and forced the automotive industry to develop in a cleaner and more environmentally friendly direction. . In recent years, new energy vehicles driven by power batteries supported by policies are slowly replacing traditional fuel vehicles powered by fuel. However, new e...

AI Technical Summary

Problems solved by technology

Among them, air medium thermal management has disadvantages such as poor heat dissipation performance, uneven heat dissipation, and poor working reliability.

Liquid medium heat management has disadvantages such as complex heat dissipation system structure, high safety level requirements, high cost, and the need for external energy consumption assistance.

However, the thermal management of traditional phase change materials has disadvantages such as low thermal conductivity and easy leakage.

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