US 12,091,780 B2
Method for producing carbon fiber and carbon fiber produced using same
Hee Rok Jung, Suwon-si (KR); and Cheol Kim, Seongnam-si (KR)
Assigned to HYOSUNG ADVANCED MATERIALS CORPORATION, Seoul (KR)
Appl. No. 17/638,507
Filed by HYOSUNG ADVANCED MATERIALS CORPORATION, Seoul (KR)
PCT Filed Aug. 31, 2020, PCT No. PCT/KR2020/011628
§ 371(c)(1), (2) Date Feb. 25, 2022,
PCT Pub. No. WO2021/045462, PCT Pub. Date Mar. 11, 2021.
Claims priority of application No. 10-2019-0108687 (KR), filed on Sep. 3, 2019.
Prior Publication US 2022/0205144 A1, Jun. 30, 2022
Int. Cl. D01D 5/06 (2006.01); D01F 9/22 (2006.01); D01F 11/12 (2006.01); D06M 13/165 (2006.01); D06M 13/17 (2006.01); D06M 13/224 (2006.01); D06M 101/40 (2006.01)
CPC D01F 9/225 (2013.01) [D01F 11/127 (2013.01); D06M 13/2246 (2013.01); D06M 2101/40 (2013.01); D10B 2101/12 (2013.01); D10B 2321/10 (2013.01); D10B 2401/061 (2013.01); D10B 2401/063 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method of producing a carbon fiber, comprising:
dry-wet-spinning an acrylonitrile-based polymer having a molecular weight distribution of 1.6 to 1.9 so as to obtain a polyacrylonitrile-based carbon-fiber precursor fiber;
subjecting the polyacrylonitrile-based carbon-fiber precursor fiber to a thermally stabilizing treatment process, a pre-carbonization process and a carbonization process so as to obtain a carbon fiber, and
applying only a smoothing agent to a surface of the carbon fiber after the carbonization process and immediately before winding of the carbon fiber, without applying a sizing agent composed of a resin component to the surface of the carbon fiber,
wherein the smoothing agent is at least one selected from the group consisting of an alkyl ether compound having 6 to 35 carbon atoms, an aliphatic ester compound having 6 to 35 carbon atoms, an aromatic ester compound having 6 to 35 carbon atoms, and an ether ester compound having 6 to 35 carbon atoms.