Graphene/phase-change microcapsule composite material and preparation method and application thereof

A technology of phase-change microcapsules and graphene-based materials, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve problems such as leakage of phase-change materials, improve heat absorption performance, improve heat absorption efficiency, and improve material performance effect

Pending Publication Date: 2019-05-10
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Abstract
  • Description
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Problems solved by technology

In the prior art, graphene oxide is used as the raw material of the wall material to make phase change microcapsules, but in this method, graphene oxide only relies on the force between graphene oxide functional groups to directly wrap the phase change material, directly wrapping the phase change Once the material's graphene oxide shell is broken, the phase change material is prone to leaks

Method used

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  • Graphene/phase-change microcapsule composite material and preparation method and application thereof

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Effect test

Embodiment 1

[0058] Such as figure 1 Shown, a kind of graphene / phase change microcapsule composite material, it comprises:

[0059] A plurality of phase change microcapsules 1;

[0060] A heat conduction network 2, the heat conduction network 2 is wrapped outside each phase change microcapsule 1 and combines each phase change microcapsule 1 with each other;

[0061] And, a shell structure 3 wrapped outside the phase change microcapsule 1 and the heat conduction network 2;

[0062] Wherein: the heat conduction network 2 and the shell structure 3 are made of graphene materials.

[0063] In the above-mentioned graphene / phase change microcapsule composite material, the graphene material wraps the phase change microcapsule 1, relying on the graphene material on the surface of the phase change microcapsule 1 and the graphene sandwiched between the phase change microcapsules after drying. The heat conduction network 2 between the phase change microcapsules is formed by similar materials, and ...

Embodiment 2

[0075] A preparation method of graphene / phase-change microcapsule composite material, comprising the following steps:

[0076] Disperse the 5wt% graphene slurry in deionized water, disperse for 8h at a speed of 2000rpm, and obtain a graphene dispersion with a concentration of 2wt%;

[0077] Mix 10g of phase-change microcapsules with 100g of graphene dispersion liquid with a concentration of 2wt%, stir and disperse, and dry at 60-90°C to obtain a graphene / phase-change microcapsule composite material.

Embodiment 3

[0079] A preparation method of graphene / phase-change microcapsule composite material, comprising the following steps:

[0080] Use 1g of silane coupling agent to modify the surface of 10g of phase change microcapsules, the modification steps are as follows:

[0081] 1) Weigh 180g of absolute ethanol, 20g of deionized water, and mix with each other; 2) Add acetic acid (with 36%wt concentration of acetic acid), adjust the pH to about 4; 3) Add 20g of KH-570 silane coupling agent dropwise Stir magnetically for 2 hours; 4) Stand still for at least 4 hours until the silane coupling agent is fully hydrolyzed; 5) Weigh 11g of the above liquid and mix it with 10g of microcapsules, add an appropriate amount of deionized water to dilute, stir at 600rpm for 2 hours, and put it into blast drying Take out the box after it is completely dry at 60°C.

[0082] Disperse the 5wt% graphene slurry in deionized water, disperse for 8h at a speed of 2000rpm, and obtain a graphene dispersion with a ...

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Abstract

An embodiment of the invention relates to a graphene / phase-change microcapsule composite material and a preparation method and application thereof. The composite material comprises multiple phase-change microcapsules, a heat conducting network and a shell structure wrapping the phase-change microcapsules and the heat conducting network, the heat conducting network wraps each phase-change microcapsule and mutually combines the phase-change microcapsules, and each of the heat conducting network and the shell structure is made of a graphene material. In the composite material, even the shell structure and the heat conducting network are damaged, a phase-change material wrapped in the phase-change microcapsules is less prone to leakage; the composite material is high in heat absorbing efficiency, and heat conducting among the phase-change microcapsules in the composite material is comparatively quick. The composite material can be used as a filling agent of phase-change materials, rubber or plastic. The preparation method is simple, quick and convenient for industrialization.

Description

technical field [0001] The invention relates to a graphene / phase change microcapsule composite material and its preparation method and application. Background technique [0002] Phase change material is a kind of chemical material that utilizes latent heat of phase change to store and discharge energy. It has the function of temperature adjustment, but traditional phase change material is easy to flow and lose when it is in liquid state. The microencapsulation technology of phase change materials only started in the 1970s. It is a technology in which solid or liquid phase change materials are coated with film-forming materials to form tiny particles. In the prior art, graphene oxide is used as the raw material of the wall material to make phase change microcapsules, but in this method, graphene oxide only relies on the force between graphene oxide functional groups to directly wrap the phase change material, directly wrapping the phase change Once the material's graphene ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 葛翔刘兆平李妙妙
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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