METHOD FOR PREPARATION OF AROMATIC POLYAMIDE TYPE SYNTHETIC

摘要

The whole aromatic polyamide synthetic fiber is produced by (a) dissolving poly(para-phenylene terephthalamide) of 6.5 intrinsic viscosity in 99.8wt% sulfuric acid to make an anisotropic spinning solution, (b) extruding the spinning solution through the spinneret to the coagulating solution bath, and then spinning the solution, and (c) water washing and drying it, The coagulating solution bath contains at most 25wt% sulfuric acid. The polyamide synthetic fiber has at least the tenacity of 24g/d and the elastic ratio of 850g/d.