Sustainable color stripping for cotton fabric dyed with C.I reactive red 195 in green chemicals and UV irradiation
Ahmet Daglı, Meliha Oktav Bulut
Abstract
Abstract The process that determines the efficiency and the success of a dyehouse is stripping. In this study, chemical color stripping process of knitted cotton fabric dyed with C.I. Reactive Red 195 was carried out using the dyehouse operating recipes both reductive and oxidative. Moreover, in reductive stripping process, conventional sodium hydrosulfite and green chemicals such as Reducing Agent D p and molasses were used. However, in oxidative stripping process, UV which is AOP was conducted besides traditional exhaustion and pad-batch. The samples were tested to evaluate their stripping percentage, capillarity, bursting strength values and redox potential of baths. The chemical structures were examined by ATR Fourier transform infrared spectroscopy. The experimental results showed that glucose based ecologic Reducing Agent D p revealed a stripping percentage similar to detrimental sodium hydrosulfite, but the decrease in the strength of the fabric was less. It was noted that molasses was inefficient in stripping dyed fabric. Accordingly, this agent can be used on the fabrics for fading or being combined with other agents. Thus, as green, sustainable, nontoxic alternatives to sodium hydrosulfite, Reducing Agent D p and molasses can be used in dyehouses. Using pad-batch method in oxidative stripping process damages the strength rates of the fabric the least. In the process with UV irradiation, the stripping ratio of the fabric increased, while the strength ratio decreased.