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A method for improving electrical conductivity of a carbon nanotube composite material

A carbon nanotube and composite material technology, applied in the field of conductive materials, can solve the problem of slow decline in the resistivity of carbon nanotube content, and achieve the effects of saving consumption, improving electrical conductivity, and improving the rate of decline

Inactive Publication Date: 2019-04-02
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the means of the above-mentioned prior art only reduce the percolation threshold of carbon nanotubes in the polymer matrix. When the content of carbon nanotubes in the matrix exceeds the percolation threshold, the resistivity decreases slowly when the content of carbon nanotubes continues to increase.

Method used

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  • A method for improving electrical conductivity of a carbon nanotube composite material
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step (1): uniformly mix 5.83g of carbon nanotube dispersion with 10wt% solute into 15g of aqueous polyurethane solution with 35wt% solute to obtain carbon nanotube composite material slurry with 10wt% carbon nanotube dry weight.

[0033] Step (2): 0.18g nano-carbon black is mixed in the carbon nanotube composite material slurry, carries out mechanical stirring 3h with the rotating speed of 300r / min, makes the carbon nanotube composite material slurry that improves electrical conductivity, and nano-carbon black is dry Weight is 3 wt%.

Embodiment 2

[0035] The difference from Example 1 is that 0.243g nano-carbon black is mixed into the carbon nanotube composite material slurry, and the dry weight of nano-carbon black is 4wt%.

Embodiment 3

[0037] The difference from Examples 1 and 2 is that 0.307 g of nano-carbon black is mixed into the carbon nanotube composite material slurry, and the dry weight of nano-carbon black is 5 wt%.

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Abstract

A method for improving electrical conductivity of a carbon nanotube composite material is disclosed. The method includes firstly fully mixing a carbon nanotube dispersion into a polymer solution to obtain carbon nanotube composite material slurry; mixing electrically conductive nanoparticles into the slurry; mechanically stirring the mixture at a high speed; and reinforcing contact points among carbon nanotubes by utilizing the electrically conductive nanoparticles to obtain the carbon nanotube composite material with improved electrical conductivity. The method reduces influences of carbon nanotube surface modification on electron transmission, significantly improves the rate of decrease of specific resistance when the concentration of the carbon nanotubes in a polymer matrix exceeds a percolation threshold, improves electrical conductivity of the carbon nanotube composite material, and saves the carbon nanotubes.

Description

technical field [0001] The invention relates to the technical field of conductive materials, in particular to a method for improving the conductivity of carbon nanotube composite materials. Background technique [0002] Carbon nanotubes themselves have excellent electrical conductivity, and they can be combined with polymer materials to endow polymer materials with good electrical properties. In the prior art, methods of modifying the surface of carbon nanotubes and improving dispersion are generally used to make carbon nanotubes and high-molecular materials The molecular matrix has good coupling and avoids aggregation in the matrix, or by increasing the aspect ratio of carbon nanotubes, so as to improve the electrical conductivity of carbon nanotube composites. [0003] However, the means of the above-mentioned prior art only reduce the percolation threshold of carbon nanotubes in the polymer matrix. When the content of carbon nanotubes in the matrix exceeds the percolation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08L63/00C08K3/04C08J3/215
CPCC08J3/215C08J2363/00C08J2375/04C08K3/04C08K3/041C08K2201/001C08K2201/011
Inventor 刘太奇王效军
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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