Production method of carbon fibers

• Main Authors: WANG HAOJING, LIU FUJIE, FAN LIDONG, ZHANG SHUBIN, CHENG LU, PANG PEIDONG, XUE LINBING
• Format: Patent
• Language: Chinese; English
• Published: 06.03.2013
• Subjects: APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; NATURAL OR ARTIFICIAL THREADS OR FIBRES; SPINNING; TEXTILES

The invention discloses a production method of carbon fibers. The method comprises the following steps of dissolving a water-soluble boron-containing chemical in water to form boron-containing solution, and dipping PAN (polyacrylonitrile) yarns in the boron-containing solution to form boron-containing PAN yarns; measuring the content of boron element in the boron-containing PAN yarns, and selecting the boron-containing PAN yarns of which the mass of the boron element takes up 0.01 to 0.1 percent that of the boron-containing PAN yarns for later use; analyzing the boron-containing PAN yarns for later use by using a secondary ion mass spectrum analyzer to obtain the mass of the boron element in the surface layer which is 50nm from the surface to the interior of the boron-containing PAN yarns for later use, and taking the yarns of which the mass of the boron element in the surface layer takes up over 60 percent that of all the boron elements as PAN-base carbon fibers; and oxidizing and carbonizing the PAN-base ca