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Cairo, Egypt

Ibrahim N.A.,National Research Center of Egypt | E-Zairy W.R.,Textile Printing | Eid B.M.,National Research Center of Egypt
Carbohydrate Polymers

The main goal of this work was to increase disperse dye substantivity for cotton cellulose containing fabrics via modification with monochlorotriazine-β-CD (MCT-β-CD), which posses hydrophobic cavities along with remarkable capability to form inclusion complexes with organic substances through host-guest interactions. The proper conditions for simultaneous alkaline-disperse dyeing as well as grafting of MCT-β-CD onto and/or within cotton and cotton/PET (50/50) blend fabrics were presented. As a result of this novel approach, the obtained dyeings showed a remarkable improvement in their depth of shades along with a significant enhancement in their UV-protection properties. The extent of improvement in disperse dyeing and in subsequent UV-protecting is determined by the nature of substrate, extent of modification, type and concentration of PEG and disperse dye as well as the union-bath conditions, i.e. temperature, time and pH. Mode of interactions, SEM of untreated and grafted C/PET fabric, as well as fastness properties of the obtained dyeings were also investigated. © 2009 Elsevier Ltd. All rights reserved. Source

El-Zairy E.M.R.,Textile Printing
Autex Research Journal

The technical feasibility of using Aloe vera gel as a new thickener for printing polyester with disperse dyes was examined. The results indicate that the properties of the printed fabric samples (colour strength, K/S, overall fastness properties, handling and sharpness) were dependent on gel concentration, the type and concentration of additive (i.e. urea or citric acid), as well as the fixation conditions using the super-heated steam technique. The optimum conditions for printing polyester fibre with disperse dyes using Aloe vera gel as a thickener were as follows: 30 g/kg disperse dye, 50 g/kg urea, 15 g/kg citric acid, 500 g/kg Aloe vera thickener and 50% drying at 100°C for 3 min followed by steam fixation for 6 min at 180°C. © AUTEX. Source

Ibrahim N.A.,National Research Center of Egypt | El-Zairy E.M.R.,Textile Printing | El-Zairy M.R.,Textile Printing | Khalil H.M.,Textile Printing
Journal of Industrial Textiles

Pretreatment of polyester-containing fabrics with chitosan, polyethylene glycol along with N-methylol crosslinking agent (Arkofix® NDW, DMDHEU) in the presence of MgCl2. 6H2O/citric acid as a mixed catalyst was carried out for enhancing their printability with disperse dyes as well as upgrading their ultraviolet-protecting properties. The results showed that the changes in the depth of the obtained prints are governed by the type of substrate, chitosan concentration and steaming conditions. On the other hand, incorporation of polyethylene glycol in the pretreatment bath results in a remarkable improvement in the depth of the post-printed fabric samples. Scanning electron microscope images showed the presence of chitosan-based deposits firmly attached to the surface of the pretreated fabric samples. The mechanism of surface modification via loading of chitosan with its amino groups along with polyethylene glycol moieties onto and/or into the finish/fabric matrix was proposed. © The Author(s) 2011. Source

Ibrahim N.A.,National Research Center of Egypt | El-Zairy E.M.R.,Textile Printing | El-Zairy M.R.,Textile Printing | Khalil H.M.,Textile Printing
Coloration Technology

This study demonstrates the possibility of improving the transfer printability and fastness properties, as well as the ultraviolet-protecting functionality, of polyester, polyester/wool, polyester/cotton and polyester/viscose woven fabrics via pretreatment with monochlorotriazinyl β-cyclodextrin (MCT-β-CD), chitosan or ethylenediamine, followed by subsequent transfer printing with sublimable disperse dyes. The modification variables as well as the transfer printing conditions were optimised. The experimental results reveal that generating hydrophobic cavities (via grafting of β-CD) at the fabric surface, fixing of chitosan, with its amino groups, onto the finish/fabric matrix, or introducing amine functional groups, via aminolysis of the polyester component, results in obtaining transfer printed fabric samples with darker depth of shades and better fastness properties, as well as with higher ultraviolet-protecting functions. It was further noted that, in all cases, the enhancement in the imparted properties is governed by type of substrate, kind and extent of chemical modification, affinity for the sublimable disperse dyes, accessibility of generated hosting and fixing sites, as well as the ultraviolet-blocking capacities of the modified/post-printed substrates against damaging ultraviolet rays. The mode of interaction, as well as the surface morphology of some non-treated and treated fabric samples, was also investigated. © 2010 The Authors. Coloration Technology © 2010 Society of Dyers and Colourists. Source

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