Graphene@polymer microsphere / alkane composite phase change material and preparation method thereof

By combining graphene with polymer microspheres of the same size but different thicknesses, a thermally conductive network framework is constructed, solving the problems of poor thermal conductivity and viscosity control in alkane phase change materials, and realizing a composite phase change material with high thermal conductivity and heat storage performance.

CN118995144BActive Publication Date: 2026-07-14HEFEI INSTITUTE OF PHYSICAL SCIENCE CHINESE ACADEMY OF SCIENCES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HEFEI INSTITUTE OF PHYSICAL SCIENCE CHINESE ACADEMY OF SCIENCES
Filing Date
2024-08-01
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing alkane-based phase change materials have drawbacks such as poor thermal conductivity, large volume expansion coefficient, and easy leakage in applications. Furthermore, the preparation process of existing composite phase change materials is complex, costly, and the viscosity is difficult to control.

Method used

By combining graphene with polymer microspheres of the same diameter but different thicknesses and adding dispersing agents, a mixed graphene@polymer microsphere/alkane composite phase change material is formed through ultrasonic crushing. This material constructs a thermally conductive network framework structure, controls viscosity, and improves thermal conductivity.

Benefits of technology

It achieves a 2-5 times improvement in thermal conductivity, adjustable viscosity within a certain range, simple preparation process, low cost, and is suitable for large-scale production.

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Abstract

The application belongs to the technical field of phase change materials, and particularly relates to a mixed graphene / polymer microsphere / alkane composite phase change material and a preparation method thereof. The preparation method comprises the following steps: heating and melting an alkane base to obtain an alkane fluid, adding two kinds of graphene with the same sheet diameter and different thicknesses and a dispersing aid into the alkane fluid, adding polymer microspheres, sealing and placing in a heat treatment device at 50-80 DEG C, and then performing ultrasonic crushing to obtain the graphene / polymer microsphere / alkane composite phase change material. The two kinds of graphene with the same sheet diameter and different thicknesses and the microsphere-assisted heat conduction framework significantly improve the heat conductivity of the alkane phase change material, significantly reduce the viscosity, and minimize the influence of the phase change enthalpy, so that the efficient heat conduction and energy storage efficiency are realized. The preparation process is simple, and the mass production and application can be realized.
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