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Preparation method of isotropic high-thermal-conductivity carbon nanofiber membrane, and product thereof

A technology of nano-carbon fiber and nano-fiber film, which is applied in the field of new material technology and heat-conducting materials, can solve the problems that the thermal conductivity of the heat-conducting film is not obvious, and the thermal conductivity of the heat-conducting film cannot be realized, so as to achieve good thermal conductivity and good thermal conductivity Effect

Active Publication Date: 2020-05-19
SONGSHAN LAKE MATERIALS LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Research on thermal conductive film materials pays more attention to improving its in-plane thermal conductivity. For example, the publication number "CN110066174A" announced a flexible graphene composite thermal conductive film with an in-plane thermal conductivity as high as 2000W / (m K), but it cannot achieve thermal conductivity. Higher out-of-plane thermal conductivity of the film
Publication No. "CN109913185A" discloses a method of using mechanical shear to induce flake boron nitride orientation, layer stacking and hot pressing to form a thermally conductive network structure in an epoxy resin matrix, but it is difficult to improve the out-of-plane thermal conductivity of the thermally conductive film. The effect of the coefficient is not obvious

Method used

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  • Preparation method of isotropic high-thermal-conductivity carbon nanofiber membrane, and product thereof
  • Preparation method of isotropic high-thermal-conductivity carbon nanofiber membrane, and product thereof
  • Preparation method of isotropic high-thermal-conductivity carbon nanofiber membrane, and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: the PAN powder of 6g is dissolved in the DMF of 50mL and the preparation concentration is the PAN solution of 12%, the PAN solution is packed in the injector, the setting spinning distance is 15cm, and the injection speed is 2.5mL / h, The spinning voltage was 15kV, and the PAN nanofiber membrane was prepared by electrospinning; after spinning for 8 hours, a PAN fiber membrane with a thickness of about 150 μm was obtained. figure 1 It is the scanning electron micrograph of the obtained PAN fiber.

[0024] The prepared PAN nanofiber membrane is placed between the two rollers of the roller press, the distance between the two rollers is adjusted to 75 μm, and the rollers are rotated for rolling to make the PAN fiber membranes cross-linked and densified. figure 2 It is a scanning electron micrograph of the PAN fiber after rolling. It can be seen that the fiber is denser and the contact at the intersection is enhanced.

[0025] Place the PAN nanofiber membrane ...

Embodiment 2

[0028] Embodiment 2: This embodiment is basically the same as Embodiment 1, the difference is that the distance between the two rollers is 50 μm during rolling, and other conditions are the same as in Embodiment 1.

[0029] The thermal conductivity of the carbon nanofiber film prepared in this example is 13.1 W / (m·K) in the plane direction, and 12.0 W / (m·K) in the vertical direction.

Embodiment 3

[0030] Embodiment 3: This embodiment is basically the same as Embodiment 1, except that the distance between the two rollers is 100 μm during rolling, and other conditions are the same as in Embodiment 1.

[0031] The thermal conductivity of the carbon nanofiber film prepared in this example is 10.3 W / (m·K) in the plane direction, and 8.7 W / (m·K) in the vertical direction.

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Abstract

The invention discloses a preparation method of an isotropic high-thermal-conductivity carbon nanofiber membrane, and a product thereof. The preparation method comprises the following steps: (1) electrostatic spinning; (2) rolling; (3) hot pressing; (4) pre-oxidation; (5) carbonizing; and (6) graphitization. According to the preparation method disclosed by the invention, the PAN fiber membrane isprepared by an electrostatic spinning technology; then rolling and hot pressing treatment is carried out on the PAN fiber membrane, so tightly cross-linked adhesion nodes are formed among PAN fibers;and then pre-oxidation, carbonization and graphitization treatment is carried out, so the carbon nanofibers are highly cross-linked and are in close contact with each other, a continuous heat transferpath is formed in each direction, a good heat conduction network is formed, the carbon nanofibers are ensured to have good heat conductivity in each direction, the defects that a traditional carbon nanofiber membrane is low in heat conductivity and a graphite heat conduction membrane has low a heat conductivity coefficient in a vertical direction are effectively overcome, and good heat conductioneffect is obtained.

Description

technical field [0001] The invention relates to the technical fields of new material technology and heat-conducting material, in particular to a method for preparing an isotropic high-heat-conductivity nano-carbon fiber film and a product thereof. Background technique [0002] Carbon nanofiber membranes have a wide range of uses, many of which require high thermal conductivity. For example, carbon nanofiber membranes have the advantages of large specific surface area and continuous conductive network when used as catalyst supports for fuel cells. If the heat cannot be exported in time, the membrane electrode may be overheated and damaged. Carbon nanofiber membranes are also required to have high thermal conductivity when used in chemical reaction catalyst supports, electrocatalytic hydrogen production catalyst supports, and various functional composite materials, so that the heat generated by the reaction can be exported in time to keep the temperature constant. The poor co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205D01F9/22D04H1/728D01D5/00B82Y40/00
CPCC01B32/205D01F9/22D04H1/728D01D5/0015B82Y40/00
Inventor 于杰林梓家
Owner SONGSHAN LAKE MATERIALS LAB
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