METHOD FOR IMPROVING COLOR FASTNESS TO DYEING OF POLYAMIDE-BASED FIBER

摘要

PROBLEM TO BE SOLVED: To improve color fastness to dyeing without affecting the environment and the human body by imparting an organic or inorganic acid salt of aluminum to a polyamide-based fibrous dyed product and then by imparting a tannin-based improver of color fastness to dyeing. SOLUTION: This method comprises treating a polyamide-based fibrous dyed product at 30-100 deg.C for 20-30 min so as to impart an organic or inorganic acid salt of aluminum (e.g. aluminum acetate, aluminum chloride or the like) to the polyamide-based fibrous dyed product in an amount of 0.1-5.0 wt.% (preferably 0.3-4.0 wt.%) based on the weight of the dyed product and then to treat it at 60-100 deg.C for 20-30 min so as to impart an improver of color fastness to dyeing, containing tannic acid or synthetic tannin in an amount of 0.5-5.0 wt.% (preferably 1.0-4.0 wt.%).