Abstract

This research work examines the process of dyeing polyester/cotton fabrics with a highly effective fiber-reactive and a disperse dyestuffs namely, (E)-4-hydroxy-5-((4-((2-sulfophenyl)amino)-1,3,5-triazin-2-yl)amino)-3-((2-sulfophenyl)diazenyl)naphthalene-2,7-disulfonic acid and (E)-5-((4-nitrophenyl)diazenyl)pyridin-2(1H)-one, respectively in one pot processes of printing and dyeing. It gives special attention to modify the influence of some important parameters such as the pH, the temperature and the concentration of the dye-bath used. The disperse and fiber-reactive dyes were formulated by pigmented printing paste in a specified styrene-acrylic as a polymeric matrices, in two different concentrations of 3 and 5%. Thereafter, it was printed on cotton fabric and dyed on polyester fabric, dried at 95°C in 2 min and fixed at 150°C in 3 min. The characteristics of cured prints such as paste add-on, fastness to washing and dry/wet rubbing were evaluated, together with fabrics stiffness. The highest K/S was obtained and the fastness properties range between good and excellent for samples printed using styrene-acrylic matrices. The lowest K/S was obtained in the case of styrene-ethylacrylate used as a standard commercial binder. Using styrene-2-ethyl hexylacrylate gave K/S better than styrene-butylacrylate for two types of printed fabrics. Dyed textiles thereafter were characterized by good dry-rubbing and washing fastness but medium wet-rubbing fastness properties. The alkaline pretreatment was affected; the adhesion of the earlier mentioned disperses and fiber-reactive dyes in the company of chitin biopolymer, to the substrate fabrics, which was manifested by the greater color strength. Pretreatment in an alkaline solution containing 10 g/l NaOH was permitted.

Key words: Styrene-acrylic binders, pigment printing of cotton, polyester textile fabrics.