Method for enhancing stability of expanded graphite-based inorganic hydrated salt composite phase change material

A technology of composite phase change materials and inorganic hydrated salts, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problem of unstable heat storage performance, poor adsorption performance of inorganic hydrated salts, packaging of composite shaped phase change energy storage materials The amount cannot be further improved to achieve the effects of adsorption, surface tension reduction and wettability improvement

Inactive Publication Date: 2021-11-12
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, due to the lipophilic and hydrophobic characteristics of the surface of expanded graphite, its adsorption performance on inorganic hydrated salts is poor, so that the encapsulation capacity of the composite shaped phase change energy storage material cannot be further improved, and the heat storage performance is unstable.

Method used

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  • Method for enhancing stability of expanded graphite-based inorganic hydrated salt composite phase change material
  • Method for enhancing stability of expanded graphite-based inorganic hydrated salt composite phase change material
  • Method for enhancing stability of expanded graphite-based inorganic hydrated salt composite phase change material

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Embodiment 1

[0033] A method for enhancing the stability of expanded graphite-based inorganic hydrated salt composite phase-change materials, comprising the following steps:

[0034] (1) the cetyltrimethylammonium chloride of 6 mass parts is dissolved in the ethanol solution of 80 mass parts, obtain the dehydrated alcoholic solution of cetyltrimethylammonium chloride, put 3 mass parts Expanded graphite was added to the dehydrated ethanol solution of cetyltrimethylammonium chloride for vacuum ultrasonic impregnation for 5min;

[0035] (2) Dry the impregnated sample in an oven at 50°C until the quality of the sample is stable and there is no obvious alcohol taste, and the expanded graphite hydrophilic modified packaging matrix is ​​obtained;

[0036] (3) Submerge the packaging substrate in excess disodium hydrogen phosphate dodecahydrate (i.e., hydrated salt) solution for 5 minutes under the conditions of vacuum, 300W ultrasonic, and 50°C immersion, so that the hydrated salt can completely e...

Embodiment 2

[0043] A method for enhancing the stability of expanded graphite-based inorganic hydrated salt composite phase-change materials, comprising the following steps:

[0044] (1) the cetyl trimethyl ammonium chloride of 3 mass parts is dissolved in the ethanolic solution of 80 mass parts, obtain the dehydrated alcoholic solution of cetyl trimethyl ammonium chloride, put 3 mass parts of Expanded graphite is added to the dehydrated ethanol solution of cetyltrimethylammonium chloride and vacuum ultrasonically impregnated for 10min;

[0045] (2) Dry the impregnated sample in an oven at 60°C until the quality of the sample is stable and there is no obvious alcohol taste, and the expanded graphite hydrophilic modified packaging matrix is ​​obtained;

[0046] (3) Submerge the packaging substrate in excess disodium hydrogen phosphate dodecahydrate solution for 5 minutes under vacuum, 400W ultrasonic, and 50°C immersion conditions, so that the hydrated salt can completely enter the pore struc...

Embodiment 3

[0050] A method for enhancing the stability of expanded graphite-based inorganic hydrated salt composite phase-change materials, comprising the following steps:

[0051] (1) The cetyltrimethylammonium chloride of 1 mass part is dissolved in the ethanolic solution of 80 mass parts, obtain the dehydrated alcoholic solution of cetyltrimethylammonium chloride, put 3 mass parts Expanded graphite was added to the dehydrated ethanol solution of cetyltrimethylammonium chloride for vacuum ultrasonic impregnation for 15 minutes;

[0052] (2) Dry the impregnated sample in an oven at 70°C until the quality of the sample is stable and there is no obvious alcohol taste, and the expanded graphite hydrophilic modified packaging matrix is ​​obtained;

[0053] (3) Submerge the packaging substrate in excess disodium hydrogen phosphate dodecahydrate solution for 5 minutes under vacuum, 500W ultrasonic, and immersion conditions at 50°C, so that the hydrated salt can completely enter the pore struc...

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Abstract

The invention relates to the field of inorganic hydrated salt phase change heat storage materials, and provides a method for enhancing the stability of an expanded graphite-based inorganic hydrated salt composite phase change material. The method comprises the following steps: (1) placing expanded graphite in an absolute ethyl alcohol solution of a quaternary ammonium salt cationic hydrophilic modifier; (2) carrying out vacuum ultrasonic impregnation on the hydrophilic modified sample for a period of time, carrying out heating in an air dry oven for several hours, and carrying out cooling to obtain modified expanded graphite, namely a packaging substrate; (3) in a vacuum ultrasonic impregnation device, immersing the packaging substrate in an excessive hydrated salt clarified solution; (4) taking out the sample, and repeatedly adsorbing with filter paper to obtain a target product. The preparation process is simple, the raw material utilization rate is high, the adsorption rate of the hydrated salt in the composite phase change material is larger than or equal to 90%, the latent heat value of the obtained phase change material is 280-300 J / g, the heat value can still be kept 100% of the original latent heat after 500 times of heat cycles, and good heat stability is achieved.

Description

technical field [0001] The invention generally relates to the field of inorganic hydrated salt phase-change heat storage materials, and in particular to a method for enhancing the stability of expanded graphite-based inorganic hydrated salt composite phase-change materials. Background technique [0002] The phase change temperature point of the phase change material (PCM) is basically constant. When the phase change occurs, it absorbs heat from the environment or releases heat to the environment, so as to release and store heat, and then regulate the temperature of the surrounding environment. It can be recycled many times, and it is a new type of energy storage material that is environmentally friendly and energy-saving. [0003] Phase change energy storage materials mainly include organic and inorganic phase change materials. Among them, inorganic hydrated salt phase change materials have excellent characteristics such as high enthalpy, wide phase transition temperature, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 辛义秀李金洪何明跃黄凯越
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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