Method for continuous manufacture of cntf having high strength and high conductivity

Patent metadata

Field	Value
Publication number	US-10246333-B1
Application number	US-201816005065-A
Country	US
Kind code	B1
Filing date	Jun 11, 2018
Priority date	Dec 11, 2017
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

Provided is a method for continuously manufacturing carbon nanotube fibers with high strength and high conductivity, which includes synthesizing carbon nanotube fibers by direct spinning; treating the carbon nanotube fibers with a strong acid while applying tension thereto; and washing the carbon nanotube fibers treated with the strong acid.

First claim

What is claimed is:

1. A method for continuously manufacturing carbon nanotube fibers with high strength and high conductivity, comprising:
synthesizing carbon nanotube fibers by direct spinning;
treating the carbon nanotube fibers with a strong acid while applying tension thereto; and
washing the carbon nanotube fibers thereafter,
wherein the carbon nanotube fibers have an I G /I D ratio of 10 or greater and the tension is applied so as to stretch the carbon nanotube fibers by 4% to 15%.

2. The method of claim 1 , wherein the carbon nanotube fibers after the washing have a density of 1.1 g/cm 3 or greater, a specific strength of 2 N/tex or greater, and an electrical conductivity of 2 MS/m or greater.

3. The method of claim 1 , wherein the tension is applied so as to stretch the carbon nanotube fibers by 8% to 15%.

4. The method of claim 3 , further comprising oxidizing the carbon nanotube fibers before treating with the strong acid.

5. The method of claim 4 , wherein the oxidation is performed so that the oxygen atom % of the carbon nanotube fibers is in the range of 2% to 20%.

6. The method of claim 1 , further comprising coagulating the carbon nanotube fibers after the treatment with the strong acid.

7. The method of claim 1 , wherein the strong acid is at least one selected from the group consisting of sulfuric acid, chlorosulfonic acid, fuming sulfuric acid, fluorosulfonic acid (FSO 3 H), trifluoroacetic acid (CF 3 COOH), trifluoromethanesulfonic acid (CF 3 SO 3 H), fluoroantimonic acid (HSbF 6 ), and carborane acid.

Assignees

• Korea Inst Sci & Tech

Inventors

• Kim Seung Min
• Jeong Hyeon Su
• Lee Jae Geun
• Lee Dong Myeong
• Lee Hun Su
• Kim Young Kwan
• Park Jun Beom

Classifications

• C01B32/16 Primary

  Preparation · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• C08K3/041

  Carbon nanotubes · CPC title

• C01B32/17 Primary

  Purification · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title