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Inorganic phase-change composite material and preparation method thereof

A phase change material and inorganic composite technology, applied in the direction of heat exchange materials, chemical instruments and methods, can solve serious, unfavorable popularization and application, heat exchanger corrosion and other problems, and achieve excellent corrosion resistance and broad market prospects Effect

Active Publication Date: 2018-08-31
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, organic phase change materials, which are more researched, are flammable. Although they have been treated with flame retardant, they may still become a hidden danger of fire.
Inorganic hydrated salt phase change materials are non-flammable, but have poor supercooling and cycle performance
In addition, the corrosion problem of eutectic salt in inorganic phase change materials to heat exchangers is very serious, which affects the practical application value and is not conducive to popularization and application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) After heating 75 parts by weight of water to 70-80°C, add 50 parts by weight of sodium acetate and stir evenly to form a transparent solution; then add 45 parts by weight of calcium chloride and form a transparent solution after stirring; then add hard 5 parts by weight of sodium acid component, slowly add 1 part by weight of phosphoric acid, a pH adjuster, under stirring, and maintain the reaction for 2 hours, so that the whole system becomes a transparent solution again. Cool down and keep stirring until the system becomes gelatinous.

[0026] 2), after the product of step 1) is heated to 70-80 ℃ again, the system becomes a transparent solution, and 6 weight parts of nucleating agent borax and 2 weight parts of anti-corrosion inhibitor (wherein triethanolamine: the mass of benzotriazole The ratio is 2:1) slowly added to the solution in step 1), stirred evenly, and the temperature of the solution was controlled at 70-80°C for half an hour;

[0027] 3) Add 1 part by...

Embodiment 2

[0031] 1) After heating 30 parts by weight of water to 70-80°C, add 65 parts by weight of sodium acetate and stir evenly to form a transparent solution; then add 33 parts by weight of calcium chloride and form a transparent solution after stirring; then add hard 2 parts by weight of sodium bicarbonate component, 3 parts by weight of boric acid, a pH regulator, was slowly added under stirring, and the reaction was maintained for 2 hours, so that the whole system became a transparent solution again. Cool down and keep stirring until the system becomes gelatinous.

[0032] 2), after the product in step 1) is heated to 70-80°C again, the system becomes a transparent solution, and 3 parts by weight of the nucleating agent sodium hexametaphosphate and 0.5 parts by weight of the anti-corrosion inhibitor (wherein triethanolamine: benzotriazepine The mass ratio of azole is 2:1) slowly added to the solution in step 1), stirred evenly, and the temperature of the solution was controlled a...

Embodiment 3

[0037]1) After heating 50 parts by weight of water to 70-80°C, add 58 parts by weight of sodium acetate and stir evenly to form a transparent solution; then add 38 parts by weight of calcium chloride and form a transparent solution after stirring; then add hard 4 parts by weight of the sodium bicarbonate component, the reaction was maintained for 2 hours under stirring, so that the whole system became a transparent solution again. Cool down and keep stirring until the system becomes gelatinous.

[0038] 2), after the product in step 1) is heated to 70-80°C again, the system becomes a transparent solution, and 4.5 parts by weight of the nucleating agent sodium pyrophosphate and 1 part by weight of the anti-corrosion inhibitor (wherein triethanolamine: benzotriazole The mass ratio is 2:1) slowly added to the solution in step 1), stirred evenly, and the solution temperature was controlled at 70-80°C for half an hour;

[0039] 3) Add 1 part by weight of the heat-conducting agent ...

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Abstract

The invention discloses an inorganic phase-change composite material and a preparation method of the material. The phase-change material comprises a main heat agent, a nucleator, a pH (potential of hydrogen) regulator, a corrosion inhibitor, a heat conduction agent and water, wherein the mass of the nucleator is 3-6% of that of the main heat agent; the mass of the pH regulator is 0-3% of that of the main heat agent; and the mass of the corrosion inhibitor is 0.5-2% of that of the main heat agent. Eutectic salt is prepared by a high-temperature hydrothermal reaction of sodium acetate, calcium chloride and sodium stearate in the pH regulator; a phase change temperature scope of the eutectic salt is reduced to 5-10 DEG C; a prepared product directly generates a self-organization framework toform the jelly-like eutectic salt, so that a thickening agent and a setting agent are not required to be added in a system; a degree of supercooling of the product is greatly reduced; and furthermore,since the ternary eutectic salt has a special structure, the ternary eutectic salt has the advantages of low lamination and supercooling possibility of an organic phase-change material and a high potential heat value of an inorganic phase-change material.

Description

technical field [0001] The invention relates to the technical field of preparation of phase change materials, in particular to an inorganic composite phase change material and a preparation method thereof. Background technique [0002] Phase change material (PCM-Phase Change Material) refers to a substance that changes the state of matter and provides latent heat as the temperature changes. The process of changing physical properties is called a phase change process, and the phase change material will absorb or release a large amount of latent heat at this time. Once this material is widely used in human life, it will become the best green carrier for energy conservation and environmental protection, and it has been listed as a national research and development utilization sequence in our country. [0003] Phase change materials have the ability to change their physical state within a certain temperature range. Take the solid-liquid phase change as an example. When heated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C23F11/14
CPCC09K5/063C23F11/149
Inventor 索艳格张治国王佳豪齐昊邵夏勇陈振
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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