Dyeing Behavior of Logwood Extract Pigment for Diacetate Fabric

Abstract

We attempted to dye a diacetate fabric using a logwood extract dye solution as a natural dye. The results showed that the dyeing behavior of logwood pigment species for diacetate fabrics was strongly influenced by the pH of the dye bath and that the dye uptake of logwood pigment at the surface of fabric reached a maximum value around pH 6. The dye uptake increases as the dyeing temperature increases, but the adsorbed pigments desorbs due to the contribution of the endothermic reaction when the temperature rises above 80°C, resulting in a decrease of the dye uptake. In addition, it is possible to mordant the logwood pigment dyed fabrics in the bath containing the active metal ions, such as aluminum, copper, and iron. As a result, we found that the mordant action was possible when the mordanted temperature was higher than the dyeing temperature, but it was preferable to perform the mordant treatment at a higher temperature (>80°C) to completely mordant the logwood pigment.