Browsing by Author "Shahin, A.A"

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    Evaluation of enzymatic hydrolyzed starches in discharge, discharge-resist and burn-out printing styles
    (NATL INST SCIENCE COMMUNICATION-NISCAIR, 2013) Abd El-Thalouth, I.; Ragheb, A.A; Nassar, S.H; Ibrahim, M.A; Shahin, A.A
    Maize starch samples have been subjected to gelatinization at 70 degrees C followed by enzymatic treatment using different concentrations of a-amylase enzyme (0.025, 0.050, 0.075 and 0.1 mL/50g starch) and then used in printing paste as thickener for discharge, discharge-resist and burn-out printing on cotton, wool/polyester and viscose/polyester/lucre fabrics. The results show that enzymatic treatment of maize starch converts the rheological properties of starch from thixotropic into pseudo-plastic. Increase in a-amylase enzyme concentration is accompanied, by a decrease in the apparent viscosity. While enzyme-treated starches give better results when used as thickening agent in discharge-resist printing compared with sodium alginate, the opposite holds true in case of discharge printing. Enzyme-treated starches specially that prepared using 0.1 mL/50g starch could act successfully as thickening agent in burn-out printing of both wool/polyester and viscose/polyester/lucre blends.
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    Innovation of Radically New Colorant Hybrid Nanocomposite for Printing Various Textile Fabrics
    (KOREAN FIBER SOC, 2019-01) Hebeish, A. A.; Shahin, A.A; RaghebI., A.; E. E, Abd El-Thalouth; H. A, Allam; H A, Shaban
    New benign colorant nanoparticles were innovated. The innovation is based on reacting the Indigo Blue Vat Dye with a natural clay named montmorillonite (K10) under sonication. A mixture of the dye and clay (1:1) at a ratio was used. The obtained new colorant nanoparticles in the form of hybrid nanocomposites were applied as a nano pigment in printing on various fabrics. The new colorant succeeded in printing silk, wool, cotton, polyester, and nylon as well as their different blends in the presence and absence of binder. Prints of the new colorant were compared with those obtained using commercial pigment. The effect of adding different amounts of binder to the printing paste on major technical properties of the prints was also investigated. Evaluation of the various printed fabrics was performed through monitoring color strength (K/S), TEM images, SEM micrographs, and overall fastness properties.