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الثلاثاء، 25 مارس، 2014

Dyeing Cotton by Direct Blue 14, Improvement of Washing Fastness and Final Finishing in One Process

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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