Nylon fabrics dyeing with colorants from coffee grounds

Abstract

This research investigates the application of natural dye extracted from spent coffee grounds for dyeing nylon fibers. The extraction process utilized a ratio of 1 g of coffee grounds to 10 mL of water (1:10), boiled for 60 minutes. The obtained dye solution was applied to nylon fabric at 100 °C for 60 minutes. The results indicated that the extracted dye exhibited good affinity for nylon under acidic conditions, achieving a dye exhaustion rate of 64.86 %. Additionally, the effects of post-mordanting with aluminum potassium sulfate and ferrous sulfate on color characteristics and colorfastness properties were evaluated. According to AATCC standard testing for colorfastness to washing and crocking, it was found that post-mordanting influenced the final color of the fabric; specifically, ferrous sulfate caused a greater color shift compared to aluminum potassium sulfate. Regarding performance, both non-mordanted and post-mordanted samples demonstrated good colorfastness to washing and crocking.