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Expanded graphite composite inorganic hydrated salt phase change material and preparation method thereof

A technology of inorganic hydrated salt and expanded graphite, which is used in the preparation of expanded graphite composite inorganic hydrated salt phase change materials, and the field of expanded graphite composite inorganic hydrated salt phase change materials, which can solve the problems of corrosion of surrounding media, poor stability, easy leakage, etc.

Pending Publication Date: 2021-09-10
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among them, inorganic hydrated salts have the characteristics of high latent heat of phase change, simple and easy to obtain, non-toxic and harmless, etc., but due to their poor stability, they are prone to phase separation, easy to leak and corrode the surrounding medium, so they cannot be directly applied.

Method used

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  • Expanded graphite composite inorganic hydrated salt phase change material and preparation method thereof
  • Expanded graphite composite inorganic hydrated salt phase change material and preparation method thereof
  • Expanded graphite composite inorganic hydrated salt phase change material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Disperse 0.3g of sodium lauryl sulfate in 10mL of absolute ethanol, and ultrasonicate at room temperature with a power of 360W for 10min until the solution becomes clear, and obtain the soaking solution for modification;

[0037] (2) Put 0.3g of expanded graphite in the soaking solution for modification, let it stand in a vacuum environment for 10 minutes, then take it out, dry it at 80°C for 30 minutes, and cool to room temperature to obtain the modified expanded graphite matrix material;

[0038] (3) Ultrasonicate the excess liquid disodium hydrogen phosphate dodecahydrate until it is completely clarified in a water bath at 50°C, and slowly add it dropwise to the modified expanded graphite matrix material until it is completely submerged. In the ultrasonic cleaning machine, heat the water bath and perform ultrasonication while vacuuming, take it out after vacuum ultrasonication for 5 minutes, repeatedly use filter paper to remove excess liquid disodium hydrogen pho...

Embodiment 2

[0041](1) Disperse 0.1g of cetyltrimethylammonium chloride in 10mL of absolute ethanol, and ultrasonicate for 10min at room temperature with a power of 360W until the solution becomes clear to obtain the soaking solution for modification;

[0042] (2) Put 0.3g of expanded graphite in the soaking solution for modification, let it stand in a vacuum environment for 10 minutes, then take it out, dry it at 80°C for 30 minutes, and cool it to room temperature to obtain the modified expanded graphite matrix material;

[0043] (3) Ultrasonicate the excess liquid disodium hydrogen phosphate dodecahydrate in a 50°C water bath until it is completely clarified, and slowly add it dropwise to the modified expanded graphite matrix material until it is completely submerged. Under a 50°C water bath, place the vacuum device on In the ultrasonic cleaning machine, heat the water bath and perform ultrasonication while vacuuming, take it out after vacuum ultrasonication for 5 minutes, repeatedly use...

Embodiment 3

[0046] (1) Disperse 0.1g of dodecyltrimethylammonium bromide in 10mL of absolute ethanol, and ultrasonicate for 10min at room temperature with a power of 360W until the solution becomes clear to obtain the soaking solution for modification;

[0047] (2) Put 0.3g of expanded graphite in the soaking solution for modification, let it stand in a vacuum environment for 10 minutes, then take it out, dry it at 80°C for 30 minutes, and cool it to room temperature to obtain the modified expanded graphite matrix material;

[0048] (3) Ultrasonicate the excess liquid disodium hydrogen phosphate dodecahydrate in a 50°C water bath until it is completely clarified, and slowly add it dropwise to the modified expanded graphite matrix material until it is completely submerged. Under a 50°C water bath, place the vacuum device on In the ultrasonic cleaning machine, heat the water bath and perform ultrasonication while vacuuming, take it out after vacuum ultrasonication for 5 minutes, repeatedly u...

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Abstract

The invention provides an expanded graphite composite inorganic hydrated salt phase change material and a preparation method thereof, and relates to the field of heat exchange or heat storage materials, and the expanded graphite composite inorganic hydrated salt phase change material is prepared from the following raw materials: absolute ethyl alcohol, a surfactant, expanded graphite and inorganic hydrated salt; the preparation method specifically comprises the following steps: dissolving a surfactant by using the absolute ethyl alcohol, modifying the hydrophilic force of the expanded graphite by using the hydrophilic and oleophylic characteristics of the surfactant, and finally packaging the inorganic hydrated salt by using the modified expanded graphite through a vacuum ultrasonic method, thereby obtaining the product. The whole preparation method is simple in process, efficient in packaging, convenient to apply, free of potential safety hazards in the operation process and suitable for large-scale industrial production and preparation. The obtained composite phase change energy storage material has high heat storage capacity and can be widely applied to the fields of solar energy storage, building temperature regulation and control, power battery heat management, heating, industrial waste heat utilization, electronic device heat dissipation and the like.

Description

technical field [0001] The invention belongs to the field of heat exchange or heat storage materials, and specifically relates to an expanded graphite composite inorganic hydrated salt phase change material. The invention also provides a preparation method of an expanded graphite composite inorganic hydrated salt phase change material suitable for industrial production. Background technique [0002] With the development of society and economy, human's demand for energy is increasing rapidly. The amount of traditional fossil energy is limited, and in the process of use, it is often accompanied by the emission of CO 2 and SO 2 and other harmful gases, further exacerbating climate change and environmental pollution. Therefore, improving energy efficiency is of great significance to alleviating energy shortage and protecting the ecological environment. [0003] Phase change energy storage materials refer to substances that change the state of matter and provide latent heat wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 李金洪白云冰黄凯越
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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