Abstract:

For solving the problem that indigo dyeing polyester/cotton blended or mixed fabrics are difficult to reach good union dyeing effect. The effects such as dosage of sodium dithionite, sodium hydroxide and benzyl alcohol, dyeing temperature and time on K/S value of polyester/cotton fabrics were studied, and the color fastness of the dyed fabrics was also tested. The results showing that the polyester/cotton fabrics are hard to get union dyeing effect by one step and one bath method with indigo dyes as the dyeing process for single polyester and cotton fabrics are different; Polyester and cotton fabrics reached good union dyeing effect, satisfied dyeing depth and dyeing fastness when the fabrics first dyeing with indigo 2%(omf), at 100℃ with benzyl alcohol 20mL/L or 120℃ without benzyl alcohol for 60min, and then be dyed with indigo 6-8%(omf), at 30℃ for 60min.

Key words: polyester/cotton fabric, indigo dye, union dyeing, K/S value