High-thermal-conductivity hydrated nitrate composite phase change material and preparation method thereof

A composite phase change material and high thermal conductivity technology, applied in the field of high thermal conductivity hydrated nitrate composite phase change material and its preparation, can solve the problems of composite phase change material leakage and weak adsorption capacity of hydrated salt

Pending Publication Date: 2022-02-18
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, expanded graphite is used as a carrier material for hydrated salt phase change materials. Due to the hydrophobicity of its surface, there is a problem of weak adsorption capacity for hydrated salts, which leads to the leakage of composite phase change materials made of expanded graphite and hydrated salts.

Method used

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  • High-thermal-conductivity hydrated nitrate composite phase change material and preparation method thereof
  • High-thermal-conductivity hydrated nitrate composite phase change material and preparation method thereof
  • High-thermal-conductivity hydrated nitrate composite phase change material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0056] The modified expanded graphite process is carried out in the following manner:

[0057] First, about 2 g of expandable graphite was weighed into a crucible, and the crucible was transferred to a muffle furnace at 500 °C and kept for 10 min. After the expansion process is completed, the muffle furnace is naturally lowered to room temperature, and the resulting product is collected, which is expanded graphite (EG). Next, soak the obtained EG in 20% absolute ethanol solution, add 0.2mol L -1 A certain volume of Al(NO 3 ) 3 9H 2 O solution, then the resulting solution was adjusted to neutral with ammonia water, and stirred at room temperature for 1 h. The fully reacted mixed solution was filtered, and the solid was dried at 60 °C for 24 h. Finally, put it into a muffle furnace at 500°C for calcination for 3 hours to obtain the modified expanded graphite MEG with a layer of aluminum oxide film on the surface.

[0058] Add 0.2mol L -1 Al(NO 3 ) 3 9H 2 When the O sol...

Embodiment 2

[0068] The preparation of the hydrated nitrate composite phase change material with high thermal conductivity is carried out in the following manner:

[0069] The MEG (N5) obtained in Example 1 is used as the carrier material, and calcium nitrate tetrahydrate (CN-4W) is placed in a water bath for heating and melting. Then, MEG with a mass ratio of 0, 5wt%, 8wt% and 10wt% (the mass percentage is calculated according to the total mass of the composite phase change material obtained) is mixed with the molten CN-4W respectively, uniformly adsorbed, and obtained after cooling. phase change material. Denote as CN-4W (1), 5 wt% MEG+CN-4W (code 2), 8 wt% MEG+CN-4W (code 3) and 10 wt% MEG+CN-4W (code 4).

[0070] Figure 5 It is the photos of four groups of calcium nitrate tetrahydrate (CN-4W) composite phase change materials after the operation of the tablet machine.

[0071] Such as Figure 6 as shown in a. It can be observed from the XRD patterns of CN-4W and composite phase ch...

Embodiment 3

[0080] High thermal conductivity CaCl 2 ·6H 2 O-Ca(NO 3 ) 2 4H 2 O composite phase change energy storage material, adopt the following method to carry out:

[0081] With the MEG (N5) that arrives in embodiment 1 as carrier material, be that the calcium chloride hexahydrate of 93% and the calcium nitrate tetrahydrate that mass percent is 7% with mass percent are the mixed phase change inorganic salt (937) that forms as The phase change inorganic hydrated salt is heated and melted in a water bath. Then, MEG with a total mass percentage of 0wt%, 5wt%, 8wt% and 10wt% is mixed and stirred with molten mixed phase-change inorganic salt (937), uniformly adsorbed, and the composite phase-change material is obtained after cooling. The prepared composite phase change materials are respectively marked as 937, 5wt% MEG+937, 8wt% MEG+937 and 10wt% MEG+937.

[0082] Figure 12-1 (a) for EG and Figure 12-1 (b) SEM image of MEG. It can be seen from the figure that Al is used on the s...

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Abstract

The invention discloses a high-thermal-conductivity hydrated nitrate composite phase change material, which comprises modified expanded graphite and a phase change material adsorbed around the modified expanded graphite, wherein the phase change material is hydrated nitrate or a hydrated nitrate-hydrated calcium chloride mixture, the mass content of the modified expanded graphite in the composite phase change material is 5-20 wt%, and the modified expanded graphite is hydrophilic modified expanded graphite of which the surface is attached with an aluminum oxide film. The invention also provides a preparation method of the high-thermal-conductivity hydrated nitrate composite phase change material. The method comprises the following steps: 1, modification of expanded graphite: soaking expanded graphite in a soluble aluminum salt solution, adjusting the pH value, filtering, and drying and calcining the solid; and 2, preparation of a composite phase change material: heating a phase change material, uniformly mixing the modified expanded graphite with the phase change material in a molten state, and cooling to obtain the high-thermal-conductivity hydrated nitrate composite phase change material.

Description

technical field [0001] The invention belongs to the technical field of phase change materials, and in particular relates to a high thermal conductivity hydrated nitrate composite phase change material and a preparation method. Background technique [0002] Phase change material (PCM) uses heat exchange with the outside world to make phase change itself, release or absorb latent heat at the same time, and achieve the purpose of energy recovery and utilization. It is a green, environmentally friendly, and recyclable heat storage and release material. PCM has important applications in various fields such as aerospace, waste heat recovery, and solar energy utilization. According to the range of phase change temperature, it can be divided into high temperature, medium and low temperature phase change energy storage materials. In order to meet their needs in a certain field, a certain phase change material is selected for related research on heat storage and release performance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C09K5/14
CPCC09K5/063C09K5/14
Inventor 朱发岩王云霞周永全刘红艳贾力凡
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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