Method for producing carbon nanotube fiber aggregate having improved level of alignment

Patent metadata

Field	Value
Publication number	US-11549202-B2
Application number	US-201716340887-A
Country	US
Kind code	B2
Filing date	Oct 27, 2017
Priority date	Oct 31, 2016
Publication date	Jan 10, 2023
Grant date	Jan 10, 2023

Abstract

The present invention relates to a method for producing a carbon nanotube fiber aggregate and provides a carbon nanotube fiber aggregate having an improved level of alignment through ultrasonic wave application and low speed recovery.

First claim

What is claimed is:

1. A method for manufacturing a carbon nanotube fiber aggregate, comprising the steps of:
forming carbon nanotubes from raw materials and continuously fusing the carbon nanotubes to directly spin a carbon nanotube fiber aggregate;
introducing the carbon nanotube fiber aggregate to a water bath to which ultrasonic waves are applied; and
recovering the introduced carbon nanotube fiber aggregate at a rate of 20 m/min or less.

2. The method for manufacturing the carbon nanotube fiber aggregate according to claim 1 , wherein the ultrasonic waves have a frequency of 1 kHz to 1 MHz.

3. The method for manufacturing the carbon nanotube fiber aggregate according to claim 1 , wherein the ultrasonic waves are applied for a period of 0.001 to 120 seconds.

4. The method for manufacturing the carbon nanotube fiber aggregate according to claim 1 , wherein a polarized Raman ratio is a ratio (IG/IG ⊥ ) of G peak intensities in a longitudinal direction to a vertical direction of the carbon nanotube fiber aggregates is 1560 cm −1 or more and 1600 cm −1 or less.

5. The method for manufacturing the carbon nanotube fiber aggregate according to claim 4 , wherein the polarized Raman ratio is 4.1 or more and 10 or less.

6. The method for manufacturing the carbon nanotube fiber aggregate according to claim 1 , wherein the raw materials for spinning comprises catalyst precursor dispersed in a liquid or gaseous carbon compound.

7. The method for manufacturing the carbon nanotube fiber aggregate according to claim 6 , wherein the liquid or gaseous carbon compound comprises at least one selected from the group consisting of methane, ethylene, acetylene, methyl acetylene, vinyl acetylene, ethanol, methanol, propanol, acetone, xylene, chloroform, ethyl acetic acid, diethyl ether, polyethylene glycol, ethyl formate, mesitylene, tetrahydrofuran (THF), dimethylformamide (DMF), dichloromethane, hexane, benzene, carbon tetrachloride and pentane.

8. The method for manufacturing the carbon nanotube fiber aggregate according to claim 6 , wherein the catalyst precursor comprises at least one selected from the group consisting of iron, nickel, cobalt, platinum, ruthenium, molybdenum, vanadium and oxides thereof.

9. The method for manufacturing the carbon nanotube fiber aggregate according to claim 6 , wherein the catalyst precursor is in a metallocene form.

Assignees

• Lg Chemical Ltd
• Postech Acad Ind Found

Inventors

• Oh Eugene
• Kim Juhan
• Kim Ji Eun
• Lee Won Jae
• Cho Hyunjung
• Lee Kun-Hong

Classifications

• D06M10/02

  Sonic or ultrasonic waves; Corona discharge · CPC title

• D01D1/065

  Addition and mixing of substances to the spinning solution or to the melt; Homogenising · CPC title

• D01F9/127

  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

• D02G3/44

  Yarns or threads characterised by the purpose for which they are designed {(protective gloves A41D19/00; protective clothing A62B17/00; ropes D07B1/02)} · CPC title

• D01F9/12 Primary

  Carbon filaments; Apparatus specially adapted for the manufacture thereof · CPC title