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Boron nitride aerogel phase-change film, and preparation method and application thereof

A boron nitride and aerogel technology, which is applied in the field of boron nitride aerogel phase change film and its preparation, can solve the problems of thermal discomfort, scalding, heat dissipation, etc., and achieves easy operation, low cost and low energy. consumption effect

Active Publication Date: 2020-10-20
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this heat dissipation behavior makes the heat transfer to the human body, bringing thermal discomfort and danger of burns

Method used

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  • Boron nitride aerogel phase-change film, and preparation method and application thereof
  • Boron nitride aerogel phase-change film, and preparation method and application thereof
  • Boron nitride aerogel phase-change film, and preparation method and application thereof

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preparation example Construction

[0045] An aspect of the embodiments of the present invention provides a method for preparing a boron nitride airgel phase change film, which includes:

[0046] A melamine borate-based material is provided, the melamine borate-based material comprising a host material and an additive, the host material comprising boric acid and melamine;

[0047] Applying pressure to the melamine borate-based material for pressure-induced assembly to prepare a melamine borate-based film;

[0048] Carrying out high-temperature pyrolysis treatment to the melamine borate-based film to prepare a boron nitride airgel film;

[0049] The boron nitride airgel film is filled with a phase change material in a molten filling manner to obtain a boron nitride airgel phase change film.

[0050] In some preferred embodiments, the additive includes any one or a combination of two or more of cyanuric acid, biuret, dimethylguanidine, triethylamine, etc., but is not limited thereto.

[0051] In some preferred e...

Embodiment 1

[0094] (a) Select a melamine borate-based material with a boric acid:melamine mass ratio of 1:1 and a cyanuric acid content of 0.01 wt%.

[0095] (b) cutting the melamine borate-based material in step (a) to obtain a melamine borate-based sheet with a thickness of 3 mm.

[0096] (c) Pressure assembling the melamine borate-based sheet in step (b) under a pressure of 10 MPa to obtain a melamine borate-based film.

[0097](d) annealing the melamine borate-based film in step (c) at 600° C. for 24 hours under an ammonia atmosphere to obtain a boron nitride airgel film.

[0098] (e) Immerse the boron nitride airgel film in step (d) in molten paraffin, let it stand in an oven at 100° C. for 1 hour, take it out, cool and solidify, and obtain a boron nitride phase-change composite film.

[0099] figure 1 This is the SEM photo of the cross-section of the boron nitride airgel phase-change film obtained in this example. Please refer to Table 1 for the structure and performance parameter...

Embodiment 2

[0101] (a) Select a melamine borate-based material with a boric acid:melamine mass ratio of 1:10 and a triethylamine content of 50 wt%.

[0102] (b) cutting the melamine borate-based material in step a) to obtain a melamine borate-based sheet with a thickness of 80 μm.

[0103] (c) Pressure assembling the melamine borate-based sheet in step b) under a pressure of 10 kPa to obtain a melamine borate-based film.

[0104] (d) annealing the melamine borate-based thin film in step c) at 1500° C. for 3 h in an argon / ammonia atmosphere to obtain a boron nitride airgel thin film.

[0105] (e) Immerse the boron nitride airgel film in step (d) in molten polyethylene glycol, let it stand in an oven at 150°C for 1 min, take it out, cool and solidify, and obtain a boron nitride phase-change composite film .

[0106] figure 2 This is the SEM photo of the cross-section of the boron nitride airgel phase-change film obtained in this example. Please refer to Table 1 for the structure and per...

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Abstract

The invention discloses a boron nitride aerogel phase-change film, and a preparation method and application thereof. The boron nitride aerogel phase-change thin film is composed of a boron nitride aerogel thin film and a phase-change material, wherein the boron nitride aerogel thin film is provided with a three-dimensional porous network formed by mutually winding and overlapping boron nitride nanoribbons, and the porous network of the boron nitride aerogel thin film is filled with the phase-change material. The preparation method comprises the following steps: carrying out cutting, pressure-induced assembling, high-temperature pyrolysis and phase-change material fusion filling on a melamine borate-based material in a block form so as to successively realize lightening and thinning, densification, pyrolysis purification and composite filling of the material, thereby obtaining the boron nitride aerogel phase-change film. The boron nitride aerogel phase-change film obtained by the invention has the function of reversibly absorbing and releasing heat energy, can be used for heat management of portable electronic equipment and wearable electronic equipment under the condition of future5G technology, creates a comfortable use environment and a comfortable work environment for human bodies and electronic elements, and is simple in preparation process.

Description

technical field [0001] The invention relates to a boron nitride airgel phase-change film and a preparation method and application thereof, belonging to the field of energy materials and nanotechnology. Background technique [0002] Airgel is a low-density solid material with a continuous three-dimensional porous network structure in which the dispersion medium is gas. Since 1932, American chemist Samuel Stephens Kistler first used supercritical fluid drying technology to prepare "solid smoke" - silica aerogel, aerogel as a new member of the material family has attracted people's attention and research. With nearly a century of development, a series of aerogels with different materials, structures and properties have been synthesized one after another, such as silica aerogels, metal oxide aerogels (TiO 2 、Al 2 o 3 , ZrO 2 etc.), metal airgel (such as gold), polymer airgel (polyaniline, polypyrrole, polyimide, etc.), carbon aerogel and new nano-carbon aerogel (graphene, ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06B01J13/00
CPCB01J13/0091C09K5/063
Inventor 张学同王伯珑李广勇
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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