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
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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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