DYE BATH FORMULATION AND METHOD FOR DYEING COPOLYESTER FIBER OR PRODUCT THEREOF TO DEEP BLACK USING THE SAME

摘要

A dye bath formulation and a method for dyeing copolyester fiber or product thereof to deep black using the same are provided. Said copolyester comprises the following four monomeric units: terephthalic acid, glycol, m-phenyl binary acid alkane ester -5- sodium or potassium sulfonate, and aliphatic binary alcohol with side chain. The mol ratio of above four monomeric units is 1: 1.1-2.4: 0.05-0.20: 0.015-0.07. Said dye bath formulation comprises: cation black dyes of 5-10 owf% which selected from cation black dyes SD-FBL, cation black dyes X-O, cation black dyes X-RL, or their combination, and buffer system containing weak acid and weak acid strong base salt which can adjust pH value of the dye bath to 3-6.5.