METHOD OF MANUFACTURING COPOLYMERIZED ARAMID FIBER AND COPOLYMERIZED ARAMID FIBER THEREBY

摘要

A method for manufacturing a copolymerized aramid fiber according to the present invention comprises the steps of adding terephthaloyl dichloride as an acid component to an organic solvent, in which a diamine component is dissolved, at the same equivalence ratio as the diamine component, followed by reaction, thereby preparing an aramid copolymer; dissolving the aramid copolymer in sulfuric acid to prepare a spinning dope; and spinning the spinning dope into a fibrous material through a spinneret, and then coagulating the spun fibrous material. The copolymerized aramid fiber manufactured by the method has a very high inherent viscosity (IV) of 7.0-11.0 and a very high intensity of 30-35 g/d. The aramid copolymer prepared according to the present invention has significantly improved molecular weight and inherent viscosity (IV) since the diamine component and the acid component used at the same equivalence ratio are sufficiently polymerized and the solubility of the aramid copolymer in the polymerized solvent is also high. As a result, the intensity of the copolymerized aramid fiber of the present invention manufactured using the aramid copolymer is significantly improved.