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A preparation method of high-strength thermally conductive film based on Kevlar nanofibers

A nanofiber, high-strength technology, applied in the field of preparation of high-strength thermal conductive film, to achieve excellent thermal conductivity, simple method, and high thermal conductivity

Active Publication Date: 2021-09-07
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it can be predicted that the inherent high thermal conductivity and mechanical strength of boron nitride will significantly improve the thermal conductivity and mechanical properties of composite materials, but a large number of experimental results show that the facts are not as predicted

Method used

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  • A preparation method of high-strength thermally conductive film based on Kevlar nanofibers
  • A preparation method of high-strength thermally conductive film based on Kevlar nanofibers
  • A preparation method of high-strength thermally conductive film based on Kevlar nanofibers

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Experimental program
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Effect test

Embodiment 1

[0034] A preparation method of pure functionalized Kevlar nano film, the specific steps are as follows:

[0035] (1) Dissolve 1g of Kevlar and 1.5g of potassium hydroxide in 500mL of dimethyl sulfoxide solvent, heat in a water bath at 40-80°C, and stir for one week to obtain a Kevlar nanofiber / dimethyl sulfoxide dispersion ;

[0036] (2) Take 50mL of Kevlar nanofiber / dimethyl sulfoxide dispersion, add 2.5mL of phosphoric acid, 5mL of deionized water, and react at 90-110°C for 5h;

[0037] (3) centrifugal washing, remove dimethyl sulfoxide, disperse in deionized water;

[0038] (4) The filter membrane is an organic nylon filter membrane with a diameter of 50mm and a pore size of 0.45 μm, and vacuum filtration to obtain a boron nitride nanosheet / Kevlar nanofiber composite film, which is dried at 80°C for 24h;

[0039] (5) Take it out after drying, immerse in 3.5mL 50% glutaraldehyde solution, at 70°C for 40min, the functionalized Kevlar nanofiber membrane is obtained.

Embodiment 2

[0041] A preparation method of a composite film containing 5wt% boron nitride nanosheets, the specific steps are as follows:

[0042] (1) Calcining the boron nitride powder under nitrogen gas in a tube furnace at 1000°C for 3 hours;

[0043] (2) Take 1 g of calcined boron nitride powder and 6 g of urea in a round-bottomed flask, and heat it in an oil bath to 130° C. to 140° C. for 4 hours under nitrogen gas;

[0044](3) After the reaction is completed, disperse the solid in 500mL deionized water, and ultrasonically strip it for 8-12 hours. In this embodiment, ultrasonic treatment is performed for 10 hours, and then the dispersion is centrifuged at 3000rpm for 1 min to obtain a supernatant; Filtration and washing with deionized water, wherein the method of filtration is preferably suction filtration, and the collected solid is dried at 65° C. for 10 h to obtain urea-functionalized boron nitride nanosheets;

[0045] (4) Dissolve 1 g of Kevlar and 1.5 g of potassium hydroxide in...

Embodiment 3

[0052] A preparation method of a composite film containing 10wt% boron nitride nanosheets, the specific steps are as follows:

[0053] (1) Calcining the boron nitride powder under nitrogen gas in a tube furnace at 1000°C for 3 hours;

[0054] (2) Take 1 g of calcined boron nitride powder and 6 g of urea in a round-bottomed flask, and heat it in an oil bath to 130° C. to 140° C. for 4 hours under nitrogen gas;

[0055] (3) After the reaction is completed, disperse the solid in 500mL deionized water, and ultrasonically strip it for 8-12 hours. In this embodiment, ultrasonic treatment is 10 hours, and then the dispersion is centrifuged at 3000rpm for 10 minutes to obtain a supernatant; Filtration and washing with deionized water, wherein the method of filtration is preferably suction filtration, and the collected solid is dried at 65° C. for 10 h to obtain urea-functionalized boron nitride nanosheets;

[0056] (4) Dissolve 1 g of Kevlar and 1.5 g of potassium hydroxide in 500 mL...

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Abstract

The invention discloses a preparation method of a high-strength heat-conducting film based on Kevlar nanofibers, which is characterized in that urea-functionalized boron nitride nanosheets and functionalized Kevlar nanofibers are used as a film material assembly, Boron nitride nanosheets / functionalized Kevlar nanofiber composite films were firstly obtained by self-assembly under reduced pressure and suction, and then the thermal conductivity and mechanical properties were improved by glutaraldehyde cross-linking to obtain boron nitride nanosheets / functionalized Kevlar composite films. Kevlar nanofiber composite film, that is, a thermally conductive film based on Kevlar nanofibers. The invention uses functionalized boron nitride nanosheets and surface-modified Kevlar nanofibers as assemblies, and realizes the chemical crosslinking structure of boron nitride nanosheets and Kevlar nanofibers through glutaraldehyde cross-linking. The tensile strength of the composite film is greatly improved, and the composite film has excellent thermal conductivity. The method is simple and effective, and the prepared high-strength thermally conductive film is expected to be used in energy, electronics and other fields.

Description

technical field [0001] The invention relates to a method for preparing a nanocomposite material, in particular to a method for preparing a high-strength heat-conducting film based on Kevlar nanofibers. Background technique [0002] With the rapid development of contemporary electronic technology and the continuous improvement of the integration level of electronic components, while providing powerful functions, it also leads to a sharp increase in its working power consumption and heat generation. High temperatures will have a detrimental effect on the stability, reliability and life of electronic components. Therefore, ensuring that the heat generated by heating electronic components can be discharged in a timely manner has become an important aspect of the system assembly of microelectronic products, and for portable electronic products with high integration and assembly density, heat dissipation has even become a technology for the entire product. Bottleneck problem. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/80D06M11/70D06M13/123C09K5/14D06M101/36
CPCC09K5/14D06M11/70D06M11/80D06M13/123D06M2101/36
Inventor 范金辰
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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