RAUVOLFIA VOMITORIA LEAVES AS A SUSTAINABLE SOURCE OF NATURAL COLOURANTS FOR POLYAMIDE FABRICS

Abstract

As the global demand for safe products is increasing, the search for new sources of natural dyes need to be intensified. This paper focuses on the extraction procedure and dyeing characteristics of Raufolvia vomitoria leaf extract as a new source of natural dyes. It was found that extraction using protic solvent (mixture of C2H5OH and 0.5M H2SO4) could reach optimal values at a temperature of 70°C after 5 hours. It was also found that the colouring and non-colouring components present in R. vomitoria leaf extract were identified as Vanillic acid, Ferulic acid, ρ-Cumaric acid and Chlorogenic acid. Simultaneous mordanting and dyeing of wool and nylon 6 fabrics were then performed in order to study the dyeability activity on these two textile fabrics. The chelating materials used as mordants were CuSO4, SnCl2 and FeSO4 The colorimetric parameters of the dyed fabric samples were determined using reflectance method. Furthermore, the washing, light and rubbing fastness properties were tested according to standard methods. In particular, the washing and light fastness properties were very good and excellent (6 and 6/7) technically