Dyeing of modified acrylic fibers with curcumin and madder natural dyes |
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Authors: | Reda M El-Shishtawy G M Shokry Nahed S E Ahmed M M Kamel |
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Institution: | (1) Textile Research Division, National Research Centre, Dokki, Cairo, Egypt |
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Abstract: | Hydrophobic fibers are highly crysta lline and non-polar polymers hence pose a big problem for dyers. Modified acrylic fiber
containing different amounts of amidoxime groups as a function of the nitrogen content was obtained and dyed with curcumin
and madder natural dyes. The dyeing parameters, such as dye concentration, dye bath pH, salt concentration, temperature, and
time and the effect of alum and ferrous sulfate used as mordants were investigated. Compared with the dyeings obtained from
modified acrylics, those of blank samples appeared less in color strength values. The color strength was proportional to the
nitrogen content of the sample and the maximum value was obtained at pH 2 and pH 5 using madder and curcumin, respectively.
The fixation of the dye molecules to the modified acrylic fibers was investigated to show mainly ionic and physical bonds.
The washing, perspiration, and rubbing fastness properties for the dyed samples were enhanced by application of alum. The
light fastness ratings were also improved using ferrous sulfate especially for the case of the samples dyed with madder. |
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