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Modified expanded graphite-hydrated inorganic salt composite phase change material as well as preparation method and application thereof

A technology of composite phase change materials and hydrated inorganic salts, applied in the fields of application, heat exchange materials, chemical instruments and methods, etc., can solve the problems of easy phase separation, low thermal conductivity, large supercooling degree, etc. Effects of separation, large specific surface area, and low degree of subcooling

Active Publication Date: 2021-12-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrated inorganic salt eutectic salt phase change materials are an important class of low-temperature phase change materials. They have the advantages of large latent heat, high heat storage density, and low price, but usually have large undercooling, easy phase separation, and thermal conductivity. Low coefficient and other problems, the application is limited

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  • Modified expanded graphite-hydrated inorganic salt composite phase change material as well as preparation method and application thereof
  • Modified expanded graphite-hydrated inorganic salt composite phase change material as well as preparation method and application thereof
  • Modified expanded graphite-hydrated inorganic salt composite phase change material as well as preparation method and application thereof

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Embodiment 1

[0038] A modified expanded graphite-hydrated inorganic salt composite phase change material, the preparation method of which comprises the following steps:

[0039] 1) Mix 14g of sodium thiosulfate pentahydrate, 6g of sodium acetate trihydrate, 0.2g of sodium carboxymethylcellulose, 0.04g of sodium pyrophosphate and 0.2g of strontium chloride hexahydrate, and heat in a water bath until Stir at 65°C for 30 minutes, and then sonicate for 15 minutes to obtain a binary hydrated inorganic salt phase change material;

[0040] 2) Disperse 5 g of expanded graphite (diameter 250 μm to 420 μm, volume expansion multiple 200 to 300 times) in 500 mL of ethanol aqueous solution with a mass fraction of 20%, heat it in a water bath to 85 ° C, and then add 30 mL of 0.2 mol concentration dropwise while stirring / L of aluminum nitrate solution and 8mL of ammonia water with a mass fraction of 25% were added dropwise in 15 minutes, reacted for 1 hour after the addition, filtered, and the filtered ...

Embodiment 2

[0052] A modified expanded graphite-hydrated inorganic salt composite phase change material, the preparation method of which comprises the following steps:

[0053] 1) Mix 10g of sodium thiosulfate pentahydrate, 5g of sodium acetate trihydrate, 0.1g of sodium carboxymethylcellulose, 0.02g of sodium pyrophosphate and 0.1g of strontium chloride hexahydrate, and heat in a water bath to Stir at 65°C for 30 minutes, and then sonicate for 15 minutes to obtain a binary hydrated inorganic salt phase change material;

[0054] 2) Disperse 5 g of expanded graphite (diameter 250 μm to 420 μm, volume expansion multiple 200 to 300 times) in 500 mL of ethanol aqueous solution with a mass fraction of 20%, heat it in a water bath to 85 ° C, and then add 30 mL of 0.2 mol concentration dropwise while stirring / L of aluminum nitrate solution and 8mL of ammonia water with a mass fraction of 25% were added dropwise in 15 minutes, reacted for 1 hour after the addition, filtered, and the filtered sol...

Embodiment 3

[0058] A modified expanded graphite-hydrated inorganic salt composite phase change material, the preparation method of which comprises the following steps:

[0059] 1) Mix 15g of sodium thiosulfate pentahydrate, 5g of sodium acetate trihydrate, 0.2g of sodium carboxymethylcellulose, 0.02g of sodium pyrophosphate and 0.2g of strontium chloride hexahydrate, and heat in a water bath to Stir at 65°C for 30 minutes, and then sonicate for 15 minutes to obtain a binary hydrated inorganic salt phase change material;

[0060] 2) Disperse 5 g of expanded graphite (diameter 250 μm to 420 μm, volume expansion multiple 200 to 300 times) in 500 mL of ethanol aqueous solution with a mass fraction of 20%, heat it in a water bath to 85 ° C, and then add 30 mL of 0.2 mol concentration dropwise while stirring / L of aluminum nitrate solution and 8mL of ammonia water with a mass fraction of 25% were added dropwise in 15 minutes, reacted for 1 hour after the addition, filtered, and the filtered sol...

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Abstract

The invention discloses a modified expanded graphite-hydrated inorganic salt composite phase change material as well as a preparation method and application thereof. The composite phase change material comprises a carrier modified expanded graphite and a loaded binary hydrated inorganic salt phase change material, the modified expanded graphite is aluminum oxide coated modified expanded graphite, and the binary hydrated inorganic salt phase change material comprises sodium thiosulfate pentahydrate and sodium acetate trihydrate. The preparation method of the composite phase change material comprises the following steps: 1) preparing the binary hydrated inorganic salt phase change material; 2) preparing modified expanded graphite; and 3) mixing the modified expanded graphite and the binary hydrated inorganic salt phase change material. The modified expanded graphite-hydrated inorganic salt composite phase change material is small in supercooling degree, large in heat conductivity coefficient, free of phase separation after multiple cycles, simple in preparation method, low in production cost and suitable for large-scale industrial application in the building field.

Description

technical field [0001] The invention relates to the technical field of phase change materials, in particular to a modified expanded graphite-hydrated inorganic salt composite phase change material and its preparation method and application. Background technique [0002] A phase change material (PCM) is a material that can store energy by changing its phase state without changing its own temperature. Phase change materials have a large heat storage capacity and can absorb / release a large amount of heat during the phase change process. Thermal energy storage systems based on phase change materials have very broad application prospects in buildings. Studies have shown that integrating phase change materials into building materials can increase the thermal inertia of buildings, reduce temperature fluctuations in rooms, and improve indoor thermal comfort, thereby reducing building energy consumption. Phase change materials are mainly divided into inorganic phase change materials...

Claims

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Application Information

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IPC IPC(8): C09K5/06F24D15/02
CPCC09K5/063F24D15/02Y02E60/14
Inventor 高学农叶礼铭
Owner SOUTH CHINA UNIV OF TECH
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