Special color change mechanism of Disperse Red 60 in alkaline dyeing system

Abstract

Color Intex (C.I.) Disperse Red 60 is a bright red anthraquinone dye, but it is easy to produce dyeing defects (a kind of discoloration phenomenon, the partial color is random blue patches) in the polyester dyeing process, and the mechanism of blue patches is unknown, resulting in a low right-one-time of dyeing. To investigate the mechanism of this particular color change, the interaction between C.I. Disperse Red 60 and borax was investigated by absorbance, and samples with blue patches were prepared; the presence of B-N bonds was confirmed by testing the X-ray Photoelectron Spectroscopy (XPS) of the dyed samples. The functional additive LV200 (a polymer containing polyester and polyether) was selected to control the interaction between the Disperse Red 60 and LV200. The results showed the co-existence of the red component (1-amino-2-phenoxy-4-hydroxy-9,10-anthraquinone) and the blue component (1-amino-2-phenoxy-10-hydroxy-4,9-anthraquinone) of Disperse Red 60 was the main reason for the random blue patches (dye defects) during the dyeing process of C.I. Disperse Red 60. By using the functional auxiliary LV200 and the H-bonding of the polar group of the dye, the conversion of the red and blue components of the reciprocal isomers can be controlled, and both bright red polyester-dyed fabrics and purplish red polyester-dyed fabrics can be produced. This provides a theoretical guide to improving the dyeing authentic rate of C.I. Disperse Red 60.