SUSTAINABLE WASTE UTILIZATION APPROACH FOR THE ECO-FRIENDLY COLOURATION OF ALPHITONIA EXCELSA LEAF-EXTRACT DYE ON NYLON SUBSTRATE
Bipin J. Agrawal
ABSTRACT - The utilization of synthetic dyestuff for the colouration of various textile fibres on commercial scale is quite efficacious due to their low cost, ease of production as well as application. However, the fact that synthetic dyes are carcinogenic in nature and are causing remarkable intimidation to the environment has led to the revitalization of the environmental friendly natural dyestuffs. Being eco-friendly, the natural dyes have a potential to gain importance commercially in the coming future. The present study deals with the application of a natural dye pertaining to the Rhamnaceae family. The natural colourant was extracted from the fallen, dried leaves of the Alphitonia excelsa tree and was applied onto the mordanted nylon substrate using exhaust dyeing technique. The mordant used for the study was a natural mordant, tannin, obtained from the used-up tea leaves and was applied by pre-, simultaneous- and post-mordanting techniques. The mordant plays an important role in attaining a preferred shade on a particular substrate. The colour strength of the dyed samples (both mordanted as well as unmordanted) was evaluated spectrophotometrically. The fastness properties of the dyed samples were found to be quite good. The washing fastness was rated as excellent for mordanted and dyed fabrics. The rubbing fastness, particularly dry rubbing fastness as well as the light fastness characteristics were found to be acceptable, from the dyer’s point of view, for all the dyed fabrics. Utilization of waste fallen leaves of the tree for extracting the natural dye and waste used-up tea leaves for mordanting may be anticipated as an “environmental-friendly approach” and a feasible stride towards waste utilization.
Keywords: Alphitonia excelsa leaves, nylon, exhaust dyeing, natural mordant, shades, waste utilization