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Inorganic phase-change material and preparation method thereof

An inorganic phase change material and quality technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of latent heat of phase change and cycle performance that have not been studied, and achieve small performance differences, simple and easy operation, and repeatability Good results

Inactive Publication Date: 2012-09-12
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the research conclusions in the above-mentioned documents prove that the eutectic salt system can prepare less than 30 o C phase change materials, but did not study its phase change latent heat and cycle performance, and failed to prepare a phase change point lower than 28 o C phase change material with high phase change latent heat and stable cycle performance

Method used

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  • Inorganic phase-change material and preparation method thereof
  • Inorganic phase-change material and preparation method thereof
  • Inorganic phase-change material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Put 100g of sodium sulfate decahydrate and 100g of disodium hydrogen phosphate dodecahydrate into 18g of water and mix between 40~45 o C. The hydrated salt is completely melted in the water bath. Add 10g of sodium pyrophosphate decahydrate and stir until a clear solution is formed. Add 0.02g of sodium polyacrylate and stir evenly, then add 10g of super absorbent resin, stir to make the super absorbent resin completely The solution is absorbed to obtain the phase change material of the present invention.

[0040] Take 20g of the phase change material obtained and put it in a test tube with a diameter of 25mm, and place the test tube in 8 o In C water, every 15 seconds, use a temperature sensor to record the temperature of the phase change material. Use temperature as the vertical axis and time as the horizontal axis to draw the solidification curve of the phase change material, such as figure 1 Shown. After measuring the solidification curve, place the test tube at 40 o In w...

Embodiment 2

[0042] Put 130g sodium sulfate decahydrate and 70g disodium hydrogen phosphate dodecahydrate into 40g water, and mix in 40~45 o In the C water bath, the hydrated salt is completely melted, 6g sodium pyrophosphate decahydrate is added and stirred until a clear solution is formed, 12g super absorbent resin is added, and the super absorbent resin is stirred to completely absorb the solution to obtain the phase change material of the present invention.

[0043] The solidification-melting curve of the phase change material of this embodiment was measured by the same method as in Example 1, as figure 2 Shown. It can be seen from the figure that the phase change material of this embodiment is o It solidifies at C, the supercooling is larger, at 22~25 o C melts.

Embodiment 3

[0045] Put 120g sodium sulfate decahydrate and 80g disodium hydrogen phosphate dodecahydrate into 32.9g water, and mix in 40~45 o Melt the hydrated salt in the C water bath, add 12g of sodium pyrophosphate decahydrate and stir until a clear solution is formed, add 6g of boric acid, the pH is reduced from 9.03 to 7.31, add 10g of super absorbent resin, stir to make the super absorbent resin completely absorb the solution. That is, the phase change material of the present invention is obtained.

[0046] The solidification-melting curve of the phase change material of this embodiment was measured by the same method as in Example 1, as image 3 Shown. It can be seen from the figure that the phase change material of this embodiment is o Solidification at C, no overcooling, at 22~25 o C melts.

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Abstract

The invention discloses an inorganic phase-change material and a preparation method thereof. The inorganic phase-change material comprises at least one of a thickening agent and a water-retaining agent, and main thermit, nucleating agent, pH regulator, heat conducting agent, and water, wherein the main thermit is eutectic salt of sodium sulfate decahydrate and sodium hydrogen phosphate docecahydrate. The preparation method comprises the following steps: adding the main thermit in water, stirring in 40-45 DEG C water bath until completely fusing, adding the nucleating agent, the pH regulator, and the heat conducting agent and fully stirring to completely dissolve the nucleating agent and the pH regulator and uniformly disperse the heat conducting agent, then adding at least one of the thickening agent and the water-retaining agent and stirring to uniformly disperse the thickening agent or completely expanse the water-retaining agent, so as to obtain the inorganic phase-change material. The inorganic phase-change material of the invention has the characteristics of noninflammability and no toxicity, the phase change temperature is 21-27 DEG C, the latent heat of phase change is 214 kJ / kg, and the inorganic phase-change material has no attenuation of performance after 1000 weeks of the solidification-fusing cycle.

Description

technical field [0001] The invention belongs to the field of energy-saving and environment-friendly materials, and in particular relates to an inorganic phase-change material and a preparation method thereof. Background technique [0002] Phase Change Material (PCM, Phase Change Material) is used as an energy storage material due to its high latent heat (>100kJ / kg). The heat released by the material during the phase change process can be used as a heat storage material when used for heating and heat preservation; the material absorbs heat during the phase change process and can be used as a cold storage material when used for cooling. Phase change materials are widely used in aerospace, construction, medical care and other fields. Inorganic hydrated salt phase change materials have high latent heat of phase change. The latent heat of phase change of these materials is mostly greater than 200kJ / kg, and the phase change temperature is distributed between 0 and 100 o Betwe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 彭天右张清刚
Owner WUHAN UNIV
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