Influence of some additives on the spectroscopic characteristics of reactive dyes

Abstract

In the process of cellulosic fabric dyeing with reactive dyes, additives are added in dyeing solution in order to achieve the high-quality shade. The influence of additives on the spectroscopic characteristics of reactive dyes was determined by VIS spectrophotometry (350-700 nm). Three classes of additives (sodium-carbonate, sodium-chloride, the wetting agent Precolor-super) and three dichlorotriazinyl reactive dyes (C.I. Reactive Yellow 22, C.I. Reactive Red 5 and C. I. Reactive Blue 163) were used. Sodium-carbonate caused the hypochromic effect for dye C.I. Reactive Yellow 22 (8.4 %). Sodium-chloride caused the hypochromic effect for dyes C.I. Reactive Yellow 22 (8.7 %) and C.I. Reactive Red 5 (3.1 %). Precolor-super caused the hypochromic effect for dyes C.I. Reactive Yellow 22 (1.6 %) and C.I. Reactive Blue 163 (3.0 %), while in the absorption spectrum of dye C.I. Reactive Red 5 hiperchromic effect was visible (2.8 %). The influence of all additives caused hiperchromic effect for dyes C.I. Reactive Yellow 22 (3.6 %) and C.I. Reactive Red 5 (5.2 %), while in the absorption spectrum for dye C.I. Reactive Blue 163 hypochromic effect was manifested (2.4 %).