Flexible composite phase change material and preparation method thereof

A technology of composite phase change materials and phase change core materials, which is applied in the field of flexible composite phase change materials and its preparation, can solve the problems of phase change thermal control components such as difficulty in installation, lack of flexibility, and difficulty in installation

Active Publication Date: 2019-01-25
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the solid-liquid phase change materials commonly used at present have become the key factors restricting the thermal control of phase change due to problems such as installation difficulties and easy leakage caused by solid-liquid changes during the phase change process.
Although some researchers have proposed a sol

Method used

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  • Flexible composite phase change material and preparation method thereof
  • Flexible composite phase change material and preparation method thereof
  • Flexible composite phase change material and preparation method thereof

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preparation example Construction

[0031] The invention provides a kind of preparation method of flexible composite phase change material, comprises the following steps:

[0032] Provide chitosan acetate solution;

[0033] Provide polyvinyl alcohol aqueous solution;

[0034] mixing carbon nanotubes with water to obtain a suspension of carbon nanotubes;

[0035] adding the carbon nanotube suspension into the chitosan acetic acid solution to obtain a mixed solution;

[0036] Mixing the mixed solution with an aqueous solution of polyvinyl alcohol to obtain a precursor solution;

[0037] Freeze-drying the precursor solution to obtain a carbon nanotube-based airgel carrier;

[0038] The carbon nanotube-based airgel carrier is impregnated with a phase-change core material solution to obtain a flexible composite phase-change material, and the phase-change core material solution is polyethylene glycol solution, stearyl alcohol solution or octadecylamine solution.

[0039] The invention provides chitosan acetic acid...

Embodiment 1

[0056] (1) Chitosan is put into molar concentration and is 5mol / L acetic acid solution, carries out ultrasonic stirring treatment, stirs 60min, and stirring speed is 600r / min, obtains the chitosan solution that uniform mass fraction is 1%;

[0057] (2) Add 20 mL of the 5 mg / mL carbon nanotube suspension of ultrasonic 60 min to the above-mentioned chitosan solution 100 mL, and ultrasonically stir for 60 min to obtain a mixed solution for subsequent use;

[0058] (3) 10 mL of the prepared polyvinyl alcohol aqueous solution with a mass fraction of 15% was added to the above mixed solution and ultrasonically pulverized to prepare a precursor solution;

[0059] (4) Put the precursor solution into liquid nitrogen to freeze, the freezing temperature is -196°C, the freezing time is 2h, and the freeze-drying pressure is 36mT; after freezing completely, put it into a freeze dryer to dry to obtain carbon nanotubes with a loose and porous structure based airgel carrier;

[0060] (5) The ...

Embodiment 2

[0066] Same as Example 1, except that the concentration of carbon nanotubes was changed to 10 mg / mL.

[0067] (1) Chitosan is put into molar concentration and is 10mol / L acetic acid solution, carry out ultrasonic stirring process, stir 60min, stirring speed is 600r / min, obtains the chitosan solution that uniform mass fraction is 1%;

[0068] (2) Add 20 mL of the 10 mg / mL carbon nanotube suspension of ultrasonic 60 min into the above-mentioned chitosan solution 100 mL, and ultrasonically stir for 60 min to obtain a mixed solution for subsequent use;

[0069] (3) 10 mL of the prepared polyvinyl alcohol aqueous solution with a mass fraction of 15% was added to the above mixed solution and ultrasonically pulverized to prepare a precursor solution;

[0070] (4) Put the precursor solution into liquid nitrogen to freeze, the freezing temperature is -196°C, the freezing time is 2h, and the freeze-drying pressure is 36mT; after freezing completely, put it into a freeze dryer to dry to ...

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Abstract

The invention provides a preparation method of a flexible composite phase change material, and belongs to the field of phase change heat storage materials. The method utilizes ice crystals formed by water in the freeze-drying process as a template to prepare a loose and porous carbon nanotube-based aerogel carrier with a porous three-dimensional network structure, obtains a flexible structure, thestrong hydrogen bonding function between polyvinyl alcohol, chitosan and a phase change core material can load more the phase change core material, the increase of the load of the phase change core material increases the storage density of the material, the match of pores of the phase change core material and the carbon nanotube-based material maintains the flexibility of the material, and the thermal conductivity of the material is better by utilizing the high thermal conductivity of a carbon nanotube.

Description

technical field [0001] The invention belongs to the technical field of phase-change heat storage materials, and in particular relates to a flexible composite phase-change material and a preparation method thereof. Background technique [0002] With the development of electronic technology, while the heat dissipation power and heat dissipation density of electronic chips are increasing, the requirements for thermal control are also getting higher and higher. Due to the advantages of high energy storage density, small temperature fluctuation, simple system, and convenient operation, phase change energy storage thermal control has become one of the most important passive thermal control methods for electronic devices. However, due to the solid-liquid phase change materials commonly used at present, problems such as installation difficulties and easy leakage caused by solid-liquid changes during the phase change process have become the key factors restricting the thermal control...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 张晓伟程飘王戈
Owner BEIJING NORMAL UNIVERSITY
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