# US 10,246,333 B1 · Method for continuous manufacture of cntf having high strength and high conductivity

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- Number: US 10,246,333 B1
- Document ID: US10246333B1
- Status: Granted
- Kind: B1
- Application number: 16/005,065
- Filed: 2018-06-11
- Granted: 2019-04-02
- Earliest claimed: 2017-12-11
- Assignees: Korea Institute of Science and Technology
- Applicants: Korea Institute of Science and Technology
- Inventors: Seung Min Kim; Hyeon Su Jeong; Jae Geun Lee; Dong Myeong Lee; Hun Su Lee; Young Kwan Kim; Jun Beom Park
- Web page: https://patentgrep.com/patent/US10246333B1

## CPC

- C01B 32/17: Purification
- C01B 32/16: Preparation
- C01B 32/168: After-treatment
- C08K 3/041: {Carbon nanotubes}
- D01F 9/12: Carbon filaments; Apparatus specially adapted for the manufacture thereof
- D02G 3/16: Yarns or threads made from mineral substances
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B82Y 40/00: Manufacture or treatment of nanostructures
- C01B 32/162: characterised by catalysts
- C01B 2202/34: Length
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES

## 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.

## Claims

### Claim 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 IG/ID ratio of 10 or greater and the tension is applied so as to stretch the carbon nanotube fibers by 4% to 15%.

### Claim 2 (depends on 1)

The method of claim 1, wherein the carbon nanotube fibers after the washing have a density of 1.1 g/cm3 or greater, a specific strength of 2 N/tex or greater, and an electrical conductivity of 2 MS/m or greater.

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 3)

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

### Claim 5 (depends on 4)

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%.

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 1)

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 (FSO3H), trifluoroacetic acid (CF3COOH), trifluoromethanesulfonic acid (CF3SO3H), fluoroantimonic acid (HSbF6), and carborane acid.