Abstract:
Today many countries use the eco-friendly concept and various steps are being taken
to preserve the environment and to reduce pollution. As the textile industry is
becoming one of the main industries in the world, it emits various kinds of pollutants
to the environment that can cause serious damages to the bio-system. Thus, industries
tend to use non-toxic and eco-friendly natural dyes instead of hazardous synthetic dyes
on textiles to minimize the pollution.
Natural dyes can be obtained from various parts of plants including roots, bark, leaves,
flowers, and fruits. These sources are freely available, and their dyes do not harm the
environment.
The aim of this research is to extract dyes form the flowers of Chenille Plant {Acalypha
hispida), under aqueous, acidic, alkaline and alcoholic conditions. Aqueous extraction
method showed best results among all extraction methods. The extraction parameters
used for aqueous method i.e. temperature, time and mass to liquid ratio were 100 °C,
2hr and 1:5 respectively. Stability of dyestuff was increased by adding known amount
of acetic acid. Cotton fibers were treated with 4% tannic acid before application of
dyestuff. Adhesion of dye to cotton fabric accompanied by a pre-mordanting method
with the mordants such as alum, chrome, copper sulfate, ferrous sulfate and stannous
chloride.
Light fastness, wash fastness, variations of surface colour strength (K/S) values, L*,
a*, b* color coordinates, and brightness index were obtained from mordanted cotton
fabrics with different mordants. Potassium dichromate showed the highest colour
value (K/S =60.366) while aluminium sulphate gave the lowest value (K/S = 17.535).
Citation:
Yasassri, M.A.H., Weerasinghe, W.D.C., & Udayakumara, S.V. (2019). Extraction of natural dye from flowers of chenille plant (Acalypha hispida) for fabrics [Abstract]. In V. Sivahar & H.S. Sitinamaluwa (Eds.), Dreams to reality through innovative materials (p. 9). Department of Materials Science and Engineering, University of Moratuwa.