The Effect of Blend, Mordant and Waste Ratio on Dyeing of Denim Products with Coffee Waste

Abstract

Natural dyestuffs, which took the place of synthetic dyestuffs in the past, have started to be used consciously again thanks to the increasing understanding of 'environmentally friendly textile'. These natural dyestuffs are mostly obtained from plants or food waste. Coffee is the most consumed nutrient in the world after water. Therefore, there is a lot of waste of coffee in nature and it contains pigments that give it its natural color. In this study, products with different fiber contents (100% cotton, 98% cotton 2% elastane, 80% cotton 20% recycled cotton) were dyed using coffee waste, and different mordant substances (aluminum sulfate, chitosan, quetemary ammonium compounds). It has been tried to reduce the amount of coffee waste used by dyeing with coffee wastes at different rates by weight (1/1, 2/1, 4/1, 8/1). Thus, it is aimed to provide less waste to the environment and to increase the color efficiency by making a more sustainable dyeing process. In addition, it is aimed to give a new direction to the denim sector by improving the rubbing and washing fastness values of dyed products. As a result of the studies, products with a product weight/coffee waste weight ratio of 8/1 were obtained with high crocking and washing fastnesses and without major losses in color tone.