Fiber Constituted from Carbon Nanotube and Method for Manufacturing Same

Patent metadata

Field	Value
Publication number	US-2021071320-A1
Application number	US-201816644656-A
Country	US
Kind code	A1
Filing date	Oct 11, 2018
Priority date	Oct 13, 2017
Publication date	Mar 11, 2021
Grant date	—

Abstract

The purpose of the present disclosure is to provide a CNT fiber that is constituted of aligned carbon nanotubes (CNTs), is thin, has little irregularity in thickness, has excellent winding properties when undergoing coiling processing, and has superior conductivity. Provided is a CNT fiber constituted of carbon nanotubes (CNTs) having a thickness of 0.01 μm-3 mm, having a coefficient of variation for irregularity in thickness of 0.2 or less, having a distribution rate a for deviation from roundness of 40% or greater, and a distribution rate b of 70% or greater. Also provided is a method for manufacturing the CNT fiber.

First claim

1 : A carbon nanotube (CNT) fiber consisting of CNTs, having a thickness of 0.01 μm to 3 mm, a coefficient of variation for thickness irregularity of 0.2 or less, and a distribution rate a of 40% or more and a distribution rate b of 70% or more as indicators of roundness.

2 : The CNT fiber according to claim 1 , wherein 50 or more CNTs having a diameter of 5 nm or less are present in arbitrary 100 CNTs when observed with a transmission electron microscope.

3 : The CNT fiber according to claim 1 , wherein in a spectrum obtained by resonance Raman spectroscopic measurement, when the maximum peak intensity in the range of 1550 cm −1 to 1650 cm −1 is defined as G and the maximum peak intensity in the range from 1300 cm −1 to 1400 cm −1 is defined as D, the ratio G/D is 0.1 or more.

4 : The CNT fiber according to claim 1 , having a fiber density of 0.3 g/cm 3 to 2.0 g/cm 3 .

5 : The CNT fiber according to claim 1 , having a conductivity of 3000 S/cm to 60000 S/cm.

6 : An electrical wire comprising the CNT fiber according to claim 1 .

7 : A coil comprising the CNT fiber according to claim 1 .

8 : A method for manufacturing a carbon nanotube (CNT) fiber having a thickness of 0.01 μm to 3 mm, a thickness irregularity of 0.2 or less in coefficient of variation, and a distribution rate a of 40% or more and a distribution rate b of 70% or more as indicators of roundness, the method comprising:
a spinning step wherein an aqueous dispersion including CNTs and a surfactant is discharged into a coagulation bath including an organic solvent to obtain CNT aggregate structures in the form of threads, and
a step wherein the obtained CNT aggregate structures are continuously drawn from the coagulation bath at a linear velocity equal to or greater than a linear discharge velocity.

Assignees

• Aist
• Asahi Chemical Ind

Inventors

• Mukai Ken
• Ikenaga Shuhei
• Asaka Kinji
• Morita Toru
• Motoyama Yujin
• Saito Yuta

Classifications

• D02G3/16

  Yarns or threads made from mineral substances · CPC title

• C01B32/168

  After-treatment · CPC title

• C01B32/174

  Derivatisation; Solubilisation; Dispersion in solvents · CPC title

• H01B1/04

  mainly consisting of carbon-silicon compounds, carbon or silicon · CPC title

• D01F9/127 Primary

  by thermal decomposition of hydrocarbon gases or vapours {or other carbon-containing compounds in the form of gas or vapour, e.g. carbon monoxide, alcohols} · CPC title