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Method for preparing carbon nanotube dispersion solution

A carbon nanotube and nanotube technology, applied in the field of preparing carbon nanotube dispersions, can solve the problems of increased viscosity, difficult to handle, overloaded dispersion equipment, etc.

Active Publication Date: 2020-05-01
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method also has problems in that when the carbon nanotubes are dispersed in the dispersion medium at a high concentration, it is difficult to handle the carbon nanotubes due to the increase in viscosity, and the dispersion equipment is overloaded.
However, since this method is a batch process, productivity is significantly lowered, making it difficult to apply this method to large-scale production

Method used

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  • Method for preparing carbon nanotube dispersion solution
  • Method for preparing carbon nanotube dispersion solution

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preparation example Construction

[0030] A method for preparing a carbon nanotube dispersion according to an embodiment of the present invention includes: mixing a dispersion solution comprising a dispersion solvent and a dispersant with carbon nanotubes to prepare a carbon nanotube paste (S1), extruding the carbon nanotube paste to Obtaining solid carbon nanotubes (S2), introducing a second solvent into the solid carbon nanotubes, and then homogenizing (S3), wherein the weight ratio of the dispersed solution to the carbon nanotubes is 1:1 to 9:1 .

[0031] According to the present invention, the S1 step is a pre-mixing step, wherein the dispersion solution and the carbon nanotubes are mixed to prepare a carbon nanotube paste, wherein the dispersion solution and the carbon nanotubes are in a weight ratio of 1:1 to 9:1 mix. Preferably, the dispersion solution and the carbon nanotubes may be mixed in a weight ratio of 1:1 to 7:1, more preferably 1:1 to 5:1.

[0032] When the weight ratio of the dispersion solu...

Embodiment 1

[0067] 500 g of N-methylpyrrolidone as a solvent and 2000 g of a polyvinylpyrrolidone (PVP) solution (5% in NMP) as a dispersant were mixed to prepare a dispersion solution, and 500 g of carbon nanotubes were added thereto to prepare a carbon nanotube paste material.

[0068] The prepared carbon nanotube paste is introduced into the extruder and extruded, wherein the extruder is a feed type extruder without temperature control function, consisting of a supply part, a rotating part and a discharge part, wherein the discharge plate opening ratio is 40%, and the diameter of the discharge port is 3mm. 3000 g of the extruded solid carbon nanotubes were introduced into 7000 g of NMP as a second solvent and mixed with a stirrer so that the concentration of the finally prepared carbon nanotubes was 5 wt%, and then a composition was obtained.

[0069] The composition was passed through a high-pressure homogenizer (PicoMax, MicroNox Corporation) 10 times at a pressure of 1500 bar to di...

Embodiment 2 to 5 and comparative example 1 to 5

[0071] A carbon nanotube dispersion was prepared by applying the same conditions as in Example 1, except that the conditions shown in Table 1 below were used to prepare the carbon nanotube dispersion.

[0072] 【Table 1】

[0073]

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Abstract

The present invention relates to a method for preparing a carbon nanotube dispersion solution, comprising the steps of: (S1) preparing a carbon nanotube paste by mixing carbon nanotubes in a dispersion solution comprising a dispersion solvent and a dispersant; (S2) obtaining a carbon nanotube solid by extruding the paste; and (S3) injecting a second solvent into the carbon nanotube solid, and thenhomogenizing the carbon nanotubes, wherein the weight ratio of the dispersion solution and the carbon nanotubes is 1:1 to 9:1. Therefore, the miscibility of a dispersant and carbon nanotubes can be improved and particle size can be controlled in a wet manner, and thus a carbon nanotube dispersion solution having a viscosity controlled in a low level, excellent resistance characteristics and a high concentration can be provided.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2018-0010888 filed with the Korean Intellectual Property Office on January 29, 2018, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a method for preparing a carbon nanotube dispersion having excellent dispersibility, thereby having a high concentration, and capable of realizing low resistance properties. Background technique [0004] A carbon nanotube is a fine carbon fiber, which is tubular carbon having an average diameter of 1 μm or less. Due to its specific structure, carbon nanotubes are expected to be applied in various fields and put into practical use due to their high electrical conductivity, high tensile strength, and high heat resistance. However, despite their usefulness, carbon nanotubes are limited in their use due to their low ...

Claims

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Application Information

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IPC IPC(8): C01B32/174
CPCC01B32/174C01B32/168B29C48/022B29C48/04B29K2105/0064B82Y30/00B82Y40/00C01B2202/28
Inventor 姜京延李丞镛金石元姜贤俊
Owner LG CHEM LTD