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Organic-inorganic composite phase change material based on magnesium nitrate hexahydrate and preparation method thereof

A technology of magnesium nitrate hexahydrate and inorganic composite, which is applied in the directions of heat exchange materials, chemical instruments and methods to achieve the effects of alleviating supercooling and phase separation, mild conditions and simple preparation methods.

Active Publication Date: 2021-06-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are no similar patents or other research results published on magnesium nitrate hexahydrate, so the present invention lays the foundation for related research

Method used

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  • Organic-inorganic composite phase change material based on magnesium nitrate hexahydrate and preparation method thereof
  • Organic-inorganic composite phase change material based on magnesium nitrate hexahydrate and preparation method thereof
  • Organic-inorganic composite phase change material based on magnesium nitrate hexahydrate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] An organic-inorganic composite phase change material based on magnesium nitrate hexahydrate is prepared from the following raw materials in parts by weight: 40 parts of glutaric acid and 60 parts of magnesium nitrate hexahydrate.

[0037] The preparation method of the organic-inorganic composite phase change material based on magnesium nitrate hexahydrate, comprises the steps:

[0038] (1) Mix glutaric acid and magnesium nitrate hexahydrate evenly in a mass ratio of 2:3;

[0039] (2) Heating at 100°C to melt the raw material;

[0040] (3) Magnetic stirring for 5 minutes to obtain a uniform composite material;

[0041] (4) Seal, cool and solidify at room temperature to obtain a white solid, grind it, and perform DSC performance test.

[0042] (5) Taking the melting starting point as the melting temperature, the melting temperature of the 40% glutaric acid-magnesium nitrate hexahydrate composite phase change material was finally measured to be 66.9°C, and the melting en...

Embodiment 2

[0045] An organic-inorganic composite phase change material based on magnesium nitrate hexahydrate is prepared from the following raw materials in parts by weight: 45 parts of glutaric acid and 55 parts of magnesium nitrate hexahydrate.

[0046] The preparation method of the organic-inorganic composite phase change material based on magnesium nitrate hexahydrate, comprises the steps:

[0047] (1) Mix glutaric acid and magnesium nitrate hexahydrate evenly in a mass ratio of 9:11;

[0048] (2) Heating at 95°C to melt the raw materials;

[0049] (3) Magnetic stirring for 5 minutes to obtain a uniform composite material;

[0050] (4) Seal, cool and solidify at room temperature to obtain a white solid, grind it, and perform DSC performance test.

[0051] (5) The melting temperature of the 45% glutaric acid-magnesium nitrate hexahydrate composite phase change material was finally measured to be 67.3°C, and the melting enthalpy was 186.4J / g.

[0052] Among them, the comparison of ...

Embodiment 3

[0054] An organic-inorganic composite phase change material based on magnesium nitrate hexahydrate is prepared from the following raw materials in parts by weight: 60 parts of glutaric acid and 40 parts of magnesium nitrate hexahydrate.

[0055] The preparation method of the organic-inorganic composite phase change material based on magnesium nitrate hexahydrate, comprises the steps:

[0056] (1) Mix glutaric acid and magnesium nitrate hexahydrate evenly in a mass ratio of 3:2;

[0057] (2) Heating at 95°C to melt the raw materials;

[0058] (3) Magnetic stirring for 5 minutes to obtain a uniform composite material;

[0059] (4) Seal, cool and solidify at room temperature to obtain a white solid, grind it, and perform DSC performance test.

[0060] (5) The melting temperature of the 60% glutaric acid-magnesium nitrate hexahydrate composite phase change material was finally measured to be 65.0°C, and the melting enthalpy was 188.8 J / g.

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Abstract

The invention discloses an organic-inorganic composite phase change material based on magnesium nitrate hexahydrate and a preparation method thereof. This type of composite phase-change material is made of the following raw materials (calculated in parts by weight): 10-90 parts of organic phase-change material (glutaric acid or urea), 10-90 parts of magnesium nitrate hexahydrate, and the weight parts of the two raw materials The sum of the numbers is 100. First mix evenly according to the ratio of raw materials, then heat and melt at 80-100°C, and stir magnetically to obtain a clear and transparent molten composite phase change material, and cool to room temperature to obtain an organic-inorganic composite phase change material. Compared with the existing phase change materials, the present invention integrates the advantages of organic and inorganic phase change materials, alleviates the phenomenon of phase separation to a certain extent, reduces the melting temperature of magnesium nitrate hexahydrate, and broadens the application of magnesium nitrate hexahydrate field, and the price is lower than the existing high latent heat, medium and low temperature phase change materials of the same type, indicating that this type of phase change material has good application prospects and market competitiveness.

Description

technical field [0001] The invention belongs to the technical field of heat storage of composite materials, and in particular relates to an organic-inorganic composite phase change material based on magnesium nitrate hexahydrate and a preparation method thereof. Background technique [0002] Phase change materials store and release latent heat by changing the state of matter with temperature changes. Using the characteristics of constant temperature during the phase change process, the temperature can be controlled within a specific range. It is a heat storage material with excellent performance and is gradually being widely used in aviation. Aerospace thermal control, building energy saving, automotive heat dissipation, clothing intelligent temperature regulation, power battery thermal management, medical and health care, electronic device cooling and military camouflage and other fields. Generally speaking, phase change materials are usually divided into organic and inorga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 张正国李穗敏凌子夜方晓明
Owner SOUTH CHINA UNIV OF TECH
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