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Boron nitride-based flexible composite shaped phase change material film and preparation and application thereof

A phase change material, boron nitride-based technology, applied in applications, heat exchange materials, chemical instruments and methods, etc., can solve the problems of difficult to meet the application, leakage, reduced operability, etc., to achieve simple operation, low requirements, The effect of improving electrical insulation

Pending Publication Date: 2022-06-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of material has the problem of leakage during the phase change, so the phase change material is often loaded into the carrier material to prepare a composite shaped phase change material so that it is still stable during the phase change process
In addition, the prepared composite shaped phase change materials are often rigid, which reduces their operability and is difficult to meet the application of many practical scenarios.

Method used

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  • Boron nitride-based flexible composite shaped phase change material film and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Take 0.3 g of boron nitride and a polyvinylidene fluoride solution (5wt%, the solvent of the polyvinylidene fluoride solution is methylpyrrolidone), and the mass ratio of boron nitride to polyvinylidene fluoride is 3:1. Magnetic stirring for 6h Mix evenly; then scrape the mixed solution into a boron nitride film of about 100um and place it in distilled water for 1 hour. Finally, place the film in a freeze dryer, set the temperature to -10 °C, and freeze dry for 48 hours to obtain boron nitride. Composite membrane carrier.

[0023] (2) Add an appropriate amount of paraffin (the mass ratio of paraffin to boron nitride film is 20:1) to the carrier in (1), place it in a vacuum oven, the degree of vacuum is -0.1MPa, and the temperature is 80°C for 3 hours of immersion . After removing the excess paraffin on the surface, a boron nitride-based flexible composite stereotyped phase change material film is finally obtained.

[0024] The boron nitride-based flexible composit...

Embodiment 2

[0026] (1) Take 0.3 g of boron nitride and polyvinylidene fluoride solution (6wt%, the solvent of polyvinylidene fluoride solution is methyl pyrrolidone), and the mass ratio of boron nitride aerogel to polyvinylidene fluoride is 1:1 Magnetic stirring for 5 hours to mix evenly; then the mixed solution was scraped into a boron nitride film of about 200um and replaced in distilled water for 1 hour. Finally, the film was placed in a freeze dryer, the temperature was set to -10 ° C, and freeze drying was obtained for 48 hours. Boron nitride composite membrane carrier.

[0027] (2) Add an appropriate amount of paraffin (the mass ratio of paraffin to boron nitride film is 20:1) to the carrier in (1), place it in a vacuum oven, the degree of vacuum is -0.1MPa, and the temperature is 80°C for 3 hours of immersion . After removing the excess paraffin on the surface, a boron nitride-based flexible composite stereotyped phase change material film is finally obtained.

[0028] The boron ...

Embodiment 3

[0030] (1) Take 0.3 g of boron nitride and polyvinylidene fluoride solution (10wt%, the solvent of polyvinylidene fluoride solution is methyl pyrrolidone), and the mass ratio of boron nitride aerogel to polyvinylidene fluoride is 2:1 Magnetic stirring for 7h to mix evenly; then the mixture was scraped into a boron nitride film of about 100um and replaced in distilled water for 1h, and finally the film was placed in a freeze dryer, the temperature was set to -10 ° C, and freeze-dried for 48h to obtain Boron nitride composite membrane carrier.

[0031] (2) Add an appropriate amount of octadecanoic acid (the mass ratio of octadecanoic acid to boron nitride film is 20:1) to the carrier in (1), place it in a vacuum oven, the degree of vacuum is -0.1MPa, and the temperature is 80 Immersion at ℃ for 3h. After removing the excess paraffin on the surface, a boron nitride-based flexible composite stereotyped phase change material film is finally obtained.

[0032] The boron nitride-ba...

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Abstract

The invention discloses a boron nitride-based flexible composite shaped phase-change material film as well as preparation and application thereof. The preparation method comprises the following specific process steps: (1) mixing boron nitride and a polyvinylidene fluoride solution into a uniform mixed solution; then the mixed solution is subjected to blade coating and solvent replacement in water to prepare a boron nitride film, and then the boron nitride film is subjected to freeze-drying to prepare the boron nitride composite film carrier. And (2) mixing a phase change material with the carrier obtained in the step (1), and placing the mixture in a vacuum oven to enable the phase change material to fully enter the carrier structure to prepare the boron nitride-based flexible composite shaped phase change material film. The boron nitride-based flexible composite shaping phase change material film prepared by the method is a white film, has the advantages of good flexibility, good shaping effect, large phase change enthalpy, good cycle performance and the like, and meanwhile, the system has obviously improved electrical insulativity and heat-conducting property, and can be used for heat energy storage and conversion and heat management of electronic equipment.

Description

technical field [0001] The invention belongs to the field of composite stereotyped phase change materials, and particularly relates to a preparation method of a boron nitride-based flexible composite stereotyped phase change material film synthesized by freeze-drying, blade coating, vacuum impregnation and the like. Background technique [0002] As an important branch of the energy field, the improvement of thermal energy storage and utilization is conducive to reducing the consumption of non-renewable energy and promoting the rational distribution of energy, thereby alleviating the current situation of the growing energy shortage in human society. [0003] As the core unit of thermal energy storage, the research and development of phase change materials are crucial to the improvement of the thermal storage capacity of thermal energy storage systems. Among them, solid-liquid phase change materials have attracted extensive attention of researchers due to their large phase tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06B29D7/01B29C41/24B29C41/00B29C70/88B29C37/00B29B7/00
CPCC09K5/063B29D7/01B29C41/24B29C41/003B29C70/88B29C37/0092B29B7/005B29L2007/002
Inventor 史全孙克衍寇艳董宏生
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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