Title :
Dyeing Cotton
by Direct Blue 14, Improvement of Washing Fastness and Final Finishing in One
Process
Author : Shimaa Osama El-Sayed Halawa
Collection : M.Sc. Chemistry
Abstract:
A
new process for dyeing cotton with bad direct blue 14 dye and finishing of
cotton at the same time. This process improves the dyeing properties and
imparts finishing to cotton. The improved dyeing process includes color
fastness to washing improved by 3.3 times and by 5 times for color change and
staining respectively. The color fastness to water improved by 1.6 times and by
3.3 times for color change and staining respectively. The color fastness to
alkaline perspiration improved by 3.3 times and by 2.5 times for color change
and staining respectively. The color fastness to acidic perspiration improved
by 1.4 times and by 2.5 times for color change and staining respectively. The
color fastness to light improved from 5 to 6 times than the blank sample. The
banded amine concentration of the dyed cotton is highly reduced from 101.4
mg/kg to 14.7 mg/kg which is lower by about the half than the safe carcinogenic
limits. The finishing of cotton includes at first improvement in tensile
strength which is increased by 4.3% for warp direction and 14.2% for weft
direction. Second, this process imparts an anti crease finish to cotton. Third,
cotton acquires resistance to mildew and rot. It is claimed that the cotton
acquires a resistance to UV radiation as polyacrylonitrile have this property.
The cotton has resistance to UV after this treatment as it is will know the
polyacrylonitile is resistant to UV radiation found in sun.
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