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Transparent nanocellulose-nanodiamond thermally conductive composite film and preparation method thereof

A nano-cellulose and nano-diamond technology, applied in the field of thermally conductive composite materials, can solve the problems of insufficient mechanical properties, complex preparation process, etc., and achieve the effects of convenient operation, simple process, good mechanical properties and bending resistance.

Active Publication Date: 2019-11-19
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the film is relatively complicated, and there is no matrix material, which is slightly insufficient in mechanical properties, which limits its production and application to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The transparent nanocellulose-nanodiamond thermally conductive composite film provided in this embodiment is composed of nanodiamond and nanocellulose, the mass fraction of nanodiamond in the composite film is 0.5%, the mass fraction of nanocellulose is 99.5%, and the particle size of nanodiamond is <100nm; the diameter of nanocellulose is 5-100nm, and the aspect ratio is 100-1000.

[0019] The preparation method of the transparent nanocellulose-nanodiamond thermally conductive composite film of this embodiment comprises the following steps:

[0020] (1). Add nano-diamonds to deionized water, ultrasonically disperse for 1-2 hours, and prepare nano-diamond dispersions with a concentration of 0.05-5 mg / mL;

[0021] (2). Add nanocellulose into deionized water, ultrasonically disperse for 1-2 hours, and prepare a nanocellulose dispersion with a concentration of 0.05-5 mg / mL;

[0022] (3). Mix the nanodiamondene dispersion obtained in step (1) with the nanocellulose dispers...

Embodiment 2

[0026] The steps of this embodiment are the same as in Example 1, the difference is that the mass fraction of nano-diamond in the transparent nano-cellulose-nano-diamond heat-conducting composite film described in this embodiment is 1%, and the mass fraction of nano-cellulose 99%.

[0027] The performance of the nanocellulose-nanodiamond heat-conducting composite film prepared in Example 2 was tested by using the LFA447 laser thermal conductivity instrument of the German Netzsch company, and the performance test result was: the thermal conductivity in the plane direction was 10.75W m -1 •K -1 , the thermal conductivity in the vertical direction is 0.15W•m -1 •K -1 , the thermal conductivity anisotropy ratio is 70, after bending 500 times, its thermal conductivity is 0-10%, and at 550nm wavelength, its light transmittance is 57%.

Embodiment 3

[0029] The steps of this embodiment are the same as in Example 1, the difference is that the mass fraction of nano-diamond in the transparent nano-cellulose-nano-diamond heat-conducting composite film described in this embodiment is 3%, and the mass fraction of nano-cellulose 97%.

[0030] The performance of the nanocellulose-nanodiamond heat-conducting composite film prepared in Example 3 was tested by using the LFA447 laser thermal conductivity instrument of the German Netzsch company, and the performance test result was: the thermal conductivity in the plane direction was 11.46W m -1 •K -1 , the thermal conductivity in the vertical direction is 0.22W•m -1 •K -1 , the thermal conductivity anisotropy ratio is 52; after bending 500 times, its thermal conductivity is 0-10%, and at a wavelength of 550nm, its light transmittance is 39%.

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Abstract

The invention discloses a transparent nano cellulose-nano diamond heat-conducting composite film which comprises the following components in percentage by weight: 0.5-10% of nano diamond and 90-99.5% of nano cellulose. The method comprises the following steps: mixing a prepared nano diamond dispersion solution and a prepared nano cellulose dispersion solution according to a certain weight ratio, stirring uniformly, and carrying out ultrasonic treatment for 0.5-1 hour to obtain a 0.05-5 mg / mL nano cellulose-nano diamond mixed solution; and putting the nano cellulose-nano diamond mixed solution in a centrifuge, carrying out centrifugal degassing at the rotation speed of 1000-3000 rpm to remove gases in the mixed solution, carrying out vacuum filtration to obtain a nano cellulose-nano diamond heat-conducting composite film, putting the composite film in a drying oven, and carrying out vacuum drying at 40-50 DEG C for 2-12 hours to obtain the transparent nano cellulose-nano diamond heat-conducting composite film. The method is simple in technique and convenient to operate. The prepared composite film has obvious anisotropy in the heat-conducting property, and has the advantages of favorable mechanical properties and bending resistance.

Description

technical field [0001] The invention relates to a heat-conducting composite film, in particular to a transparent nanocellulose-nano-diamond heat-conducting composite film and a preparation method thereof, belonging to the field of heat-conducting composite materials. Background technique [0002] Composite membrane materials prepared by traditional polymer matrix have the disadvantages of difficult molding, insufficient orientation of fillers in the matrix, poor thermal conductivity anisotropy, and poor matrix-filler compatibility. Although the pure diamond heat conduction film can avoid the above-mentioned defects, but the pure diamond lacks matrix support, has poor mechanical properties, and increases the manufacturing cost. [0003] At present, in the existing technology of nano-diamond heat-conducting composite film research, the Chinese patent application specification discloses "a LED heat dissipation substrate based on diamond film and its manufacturing method" (autho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08K3/04C08L1/02
CPCC08J5/18C08J2301/02C08K3/04C08L2201/10C08L2203/16C08L1/02
Inventor 宋娜崔思奇丁鹏施利毅焦德金
Owner SHANGHAI UNIV