Title:
METHOD FOR PRODUCING PRECURSOR FIBER FOR CARBON FIBER
Document Type and Number:
Japanese Patent JP2020015997
Kind Code:
A
Abstract:
To provide a method for producing a precursor fiber for a carbon fiber capable of inhibiting fusion of single yarns to produce carbon fibers having a high quality.SOLUTION: A method for producing a carbon fiber precursor fiber comprising a polyacrylonitrile-based copolymer, wherein a concentration of an acrylonitrile monomer in a spinning dope is controlled to less than 10 ppm, and then pH of the spinning dope is adjusted to 7.2 to 10.0, followed by using the spinning dope for spinning; the polyacrylonitrile-based copolymer is prepared preferably by copolymerizing a carboxy group-containing vinyl base compound; the polyacrylonitrile-based copolymer is obtained preferably by aqueous suspension polymerization; the spinning dope contains preferably moisture of 10 ppm or more; further, the spinning dope is adjusted preferably in pH with ammonia; the spinning method is preferably of a wet type or a dry wet type; the fibers after spun are dried preferably by a roller of 150°C or higher; the fibers after spun are subjected preferably to steam drawing; further, the present invention includes a method for producing a carbon fiber in which the carbon fiber precursor fibers obtained by the method described above are subjected to flame resistant treatment and carbonization treatment.SELECTED DRAWING: None
Inventors:
NAKANISHI TAKAYUKI
NISHI KOICHI
NISHI KOICHI
Application Number:
JP2018139727A
Publication Date:
January 30, 2020
Filing Date:
July 25, 2018
Export Citation:
Assignee:
TEIJIN LTD
International Classes:
D01F6/18; D01F9/22
Domestic Patent References:
| JPH11229232A | 1999-08-24 | |||
| JP2012188534A | 2012-10-04 | |||
| JP2012188535A | 2012-10-04 | |||
| JPH08246230A | 1996-09-24 | |||
| JP2008127697A | 2008-06-05 | |||
| JP2009249798A | 2009-10-29 |
Attorney, Agent or Firm:
Taro Tameyama