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Fiber composed of carbon nanotubes and its production method

A carbon nanotube and fiber technology, applied in the field of CNT, can solve the problems of uneven thickness, CNT fiber roundness, uneven thickness, etc., and achieve the effect of small uneven thickness, good coilability, and high roundness

Active Publication Date: 2022-05-06
NAT INST OF ADVANCED IND SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the method of using a petri dish as in Patent Document 2, the obtained CNT fibers become flat, and occurrence of unevenness in thickness cannot be avoided.
In addition, in Patent Document 3, there is no description about the roundness and thickness unevenness of the obtained CNT fibers.

Method used

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  • Fiber composed of carbon nanotubes and its production method
  • Fiber composed of carbon nanotubes and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] To 1988 g of water, 4 g of CNT (manufactured by MEIJO NANOCARBON CO., LTD., EC1.4, also referred to as eDIPS-CNT hereinafter) produced by the enhanced direct injection pyrolysis synthesis method (eDIPS method) and taurodeoxycholic acid were added 8 g of sodium (manufactured by Sigma-Aldrich LLC., also referred to as TDOC.) was dispersed for 60 minutes using an ultra-high-speed multi-function stirring system (manufactured by Primix Inc., LABOLUTION). Then, the defoaming operation was performed for 10 minutes using an autorotation revolution mixer (Awatori Rentaro ARE-250, manufactured by Thinky Corporation) to obtain an eDIPS-CNT dispersion having an eDIPS-CNT weight concentration of 0.2 mass %.

[0106] Heat was applied to the obtained eDIPS-CNT dispersion liquid on a hot plate to evaporate water so that the weight concentration of eDIPS-CNT became 0.4 mass %.

[0107] After filling the eDIPS-CNT dispersion in a syringe, an injection spinning nozzle with an inner diamet...

Embodiment 2

[0112] The same procedure as in Example 1 was carried out, except that the water in the eDIPS-CNT dispersion of Example 1 was further evaporated, and the eDIPS-CNT dispersion whose weight concentration of eDips-CNT was adjusted to be 0.6 mass % was used to obtain CNT fibers. The obtained CNT fibers were as follows: average diameter: 30 μm, coefficient of variation: 0.10, distribution ratio a: 52%, distribution ratio b: 80%, presence ratio of CNTs with a diameter of 5 nm or less: 95%, G / D ratio: 28, Electrical conductivity: 5600S / cm, fiber density: 0.6g / cm 3 .

Embodiment 3

[0114] A CNT fiber was obtained in the same manner as in Example 1, except that an injection spinning nozzle with an inner diameter of 0.41 mm was used in place of the injection spinning nozzle with an inner diameter of 0.21 mm. The obtained CNT fibers were as follows: average diameter: 53 μm, coefficient of variation: 0.15, distribution ratio a: 49%, distribution ratio b: 75%, presence ratio of CNTs with a diameter of 5 nm or less: 96%, G / D ratio: 25, Electrical conductivity 4000S / cm, fiber density: 0.5g / cm 3 . In addition, the evaluation of the compactness of the coil was performed, and the compactness of the coil (area ratio of CNT fibers) was 85%, which was a value higher than that of Comparative Example 1.

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Abstract

We provide: CNT fibers made of aligned carbon nanotubes (CNTs), which are thin, have little unevenness in thickness, have good windability during coil processing, and have excellent electrical conductivity. The present invention relates to CNT fibers composed of carbon nanotubes (CNTs) and a method for producing the CNT fibers, wherein the thickness of the CNT fibers is 0.01 μm to 3 mm, and the unevenness of the thickness is 0.2 or less in terms of coefficient of variation, in terms of roundness The distribution ratio a is 40% or more and the distribution ratio b is 70% or more, and the production method includes the following steps: a spinning step, discharging an aqueous dispersion containing carbon nanotubes (CNT) and a surfactant to an organic solvent containing In the coagulation bath, the CNT aggregation structure in the shape of a filament is obtained; and, in the pulling step, the obtained CNT aggregation structure is continuously pulled from the coagulation bath at a line speed higher than the discharge line speed.

Description

technical field [0001] The present invention relates to a CNT fiber composed of an oriented carbon nanotube (hereinafter, also referred to as CNT.) which is thin, has small thickness unevenness (unevenness), has good windability during processing, and is excellent in electrical conductivity, and the CNT fiber. manufacturing method. Background technique [0002] CNT refers to a material in which a graphene sheet composed of carbon is formed into a single-layer or multi-layer coaxial tubular shape, and has ultra-fine diameter, light weight, high strength, high flexibility, high current density, high thermal conductivity, Materials with high electrical conductivity (conductivity). CNTs have properties that are candidates for next-generation lightweight materials, and have mechanical properties, electrical properties, and thermal properties that surpass those of steel, copper, and diamond. A large number of applications using CNTs have been conceived, but in the process of proc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D02G3/16C01B32/168C01B32/174D01F9/127H01B1/04
CPCC01B32/168C01B32/174D01F9/127D02G3/16H01B1/04D01F9/12D10B2101/122B82Y30/00B82Y40/00C01B2202/22C01B2202/36C01P2002/82C01P2004/04C01P2006/10D01F9/08D02G3/441D10B2401/16
Inventor 向健池永周平安积欣志森田徹本山裕仁齐藤祐太
Owner NAT INST OF ADVANCED IND SCI & TECH
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