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A cooling phase change material with a phase change temperature of 12-29°C and its preparation method

A phase-change material and phase-change temperature technology, applied in the field of material chemistry, can solve the problems of inability to achieve cooling effect, weak feeling of coldness, insufficient phase separation, etc. Effect

Inactive Publication Date: 2011-12-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, single sodium sulfate decahydrate, as a phase change material, has shortcomings such as supercooling and insufficient phase separation; moreover, because its phase transition temperature is 32°C, in some high temperature weather, the icy feeling is not strong and cannot reach ideal cooling effect

Method used

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  • A cooling phase change material with a phase change temperature of 12-29°C and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Mix and stir 1g of glycerin and 1g of borax, add 1g of boric acid to adjust the pH value to 6, add 0.5g of sodium chloride, 0.5g of ammonium chloride and 1g of sodium polyacrylate and stir, mix well and then add 95g of sodium sulfate decahydrate, Stir at 29°C until melting, stop heating, continue stirring, the temperature of the mixture decreases, and the flocculent solid obtained after cooling is the phase change material of the present invention.

[0026] Depend on figure 1 It can be seen that the phase change temperature of the phase change material prepared in Example 1 is 29° C., and the latent heat of phase change is 190 J / g.

Embodiment 2

[0028] 3g glycerol and 3g borax were mixed and stirred, 3g boric acid was added to adjust the pH value to 7.5, 3.5g sodium chloride, 3.5g potassium chloride, 3.5g ammonium chloride, 3.5g ammonium sulfate and 2g polyacrylamide were added thereto and stirred, After mixing evenly, add 75g of sodium sulfate decahydrate, stir at 25°C until melting, stop heating, continue stirring, the temperature of the mixture decreases, and the flocculent solid obtained after cooling is the phase change material of the present invention.

[0029] Depend on figure 1 It can be seen that the phase change temperature of the phase change material prepared in Example 2 is 21° C., and the latent heat of phase change is 165 J / g.

Embodiment 3

[0031] Mix and stir 10g of glycerin and 5g of borax, add 5g of boric acid to adjust the pH value to 8, add 12.5g of potassium chloride, 12.5g of ammonium sulfate and 5g of sodium carboxymethylcellulose and stir, then add 50g of sulfuric acid decahydrate after mixing evenly Stir the sodium at 12°C until it melts, stop heating, continue stirring, the temperature of the mixture decreases, and the flocculent solid obtained after cooling is the phase change material of the present invention.

[0032] Depend on figure 1 It can be seen that the phase change temperature of the phase change material prepared in Example 3 is 12° C., and the latent heat of phase change is 140 J / g.

[0033] The phase-change material of the present invention adopts a phase-change temperature regulator. Within a certain range, with the increase of the temperature regulator, the phase-change temperature of the material gradually decreases, so that the phase-change temperature can be adjusted between 12-29°C....

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Abstract

The invention discloses a cooling phase change material with a phase change temperature of 12-29°C and a preparation method thereof. The components of the phase change material of the present invention are sodium sulfate decahydrate, a phase change temperature regulator, a moisturizing agent, a nucleating agent, a pH value regulator and a thickener, which are composed according to a certain weight ratio; the preparation method comprises the following steps : Mix humectant and nucleating agent, add pH adjuster to adjust pH value, add phase change temperature regulator and thickener, mix evenly, then add sodium sulfate decahydrate, stir at 12-29°C until melted , stop heating, continue to stir, and cool to obtain the phase change material of the present invention. The phase change material of the present invention has the advantages of non-toxicity, good stability, and large cold storage capacity. Adding a phase change temperature regulator makes the phase change temperature of the phase change material adjustable at 12-29°C, and has a long-term stable Physical cooling effect, can be used to absorb heat and cool down.

Description

technical field [0001] The invention belongs to the field of material chemistry, and relates to a phase change material and a preparation method thereof, in particular to a phase change material with a phase change temperature of 12-29°C for absorbing heat and cooling and a preparation method thereof. Background technique [0002] In the initial stage of fever and low-temperature fever, physical cooling is generally used to reduce fever. At present, the commonly used methods of cooling and reducing fever include: cooling patches and ice packs. [0003] The cooling patch contains polymer gel cooling materials. The principle is: a large amount of water contained in the gel evaporates, which will take away the heat of the human body. At the same time, mint, borneol and other substances are added to the gel to make people feel cool. When using this type of product, you only need to open the package and stick it on the forehead or other parts of the body, which is more convenie...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 刘群峰陈晓峰原波
Owner SOUTH CHINA UNIV OF TECH
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