PROCESS FOR PREPARING A POLYAMIDE 6 FIBER OF EXCELLENT COLORING PROPERTY

摘要

A manufacturing method of a polyamide 6 fiber with the excellent coloring property is provided to have the affinity for the basic dyestuffs and the contamination-proof property for the acidic dyestuffs. The polyamide 6 fiber is made from an epsilon-caprolactam. The 0.3 to 5.0 wt% of dicarboxy-benzene-sulfonate compound represented by a formula 1 to the epsilon-caprolactam is injected. The diamine compound represented by a formula 2 of H2N-R-NH2 is injected below the same mol % of the injected dicarboxy-benzene-sulfonate compound of 0.3 to 5.0 wt%. In the formula 1, Z is Na, K or Li, R is alkyl group of carbon number 1-3, m is 0 or 1, R' is hydrogen or alkyl group of carbon number 1-3. In the formula 2, R is alkyl or phenyl group of carbon number 2-12. The bis-caprolactam compound is added as the third component at the polymerization process or the spinning process. The added amount of the bis-carprolactam compound is 0.2 to 5.0 wt%. The bis-caprolactam compound is selected from terephthaloyl bis-caprolactam, isophthaloyl bis-caprolactam and carbonyl bis-caprolactam.