Study on chemical bonding of Polycarboxylic acid Black on cotton and its dyeing and finishing properties

Polycarboxylic acid Black was applied to dyeing of cotton and acted as wrinkle resistant finishing agent through the bonding between the cotton and the dye. Thermal gravimetry and FT-IR spectroscopy were used to investigate the dyeing mechanism and methods of color stripping, fiber dissolving in cuprammonia and fiber oxidation were employed to indirectly testify the ester linkage of the fiber and the dye. Dyeing properties were examined to show that Polycarboxylic acid Black could realize high fixation, good fastness properties and improved wrinkle resistance on cotton. Also, Polycarboxylic acid Black can be completely utilized by cycle dyeing due to the stability of the dye.