Arif Taner Özgüney

Effects of Pretreatment Processes on Printing Viscose Fabrics with Reactive Dyestuffs

In this project, the investigated parameters that affect the print quality of reactive dyestuffs on viscose fabrics are causticizing, bleaching, reductive treatment, padding with urea, moisturizing before printing and fixation, the amount and existence of urea in the print paste, and two fixation methods. In all these experiments, Cibacron Red P 4B and Cibacron Blue P 3R, which have the same reactivity but different molecular sizes, are used as dyestuffs. The experiments done in the laboratory are repeated in industry, and the results are examined by comparing the color efficiencies, fastness rates, and tensile strengths of the printed fabrics.

Effects of different pretreatment processes on viscose fabrics in different types and properties

Abstract In this study, the effects of different pretreatment processes on the properties of viscose fabrics (sulphur content, whiteness degree, weft yarn breaking force, crystallinity and fiber surface) and on the color efficiency and repeatability of the prints have been investigated. For this purpose, viscose fabrics obtained from different sources and containing different amounts of sulphur were causticized, bleached, and reductive-washed. After impregnation with urea, fabrics were printed with two reactive dyestuffs having the same reactivity, but different molecular sizes. Color values of both dyes were measured and fastness was tested and compared in order to observe the effects of different pretreatment processes. Different methods of sulphur analysis were also investigated and tested to determine the sulphur content of the fibres. Among these methods, the lead acetate method, which is a subjective evaluation system, has been selected as the most appropriate for practical working conditions of the plants, and a sulphur scale was formed according to this method. Accuracy of the scale was also confirmed by elemental analysis (CHNS–O) method.

Chemical structures of phthalocyanine based dyestuffs and their useage in production of functional textiles

Ftalosiyaninler keskin mavi-yeşil renkli, oldukça sağlam, iki boyutlu 18 π-elektron konjuge sistemine sahip aromatik makrosiklik bileşiklerdir. Makrohalka yapının merkezi koordinasyon boşluğuna periodik tablonun birçok elementinin; aromatik yapının periferal ve nonperiferal konumlarına ise çeşitli fonksiyonel sübstitüentlerin bağlanmasıyla ftalosiyaninlere katalitik, elektrokromik, elektriksel iletkenlik, fotovoltaik, fotoiletkenlik, ışık absorbsiyonu, foto uyarıcı gibi çeşitli özellikler kazandırmak mümkündür. Geleneksel bakır ftalosiyanin pigmenti dışında farklı ftalosiyanin türevlerinin de tekstil materyallerinin renklendirilmesinde kullanılmasıyla; farklı fonksiyonel özellikli (güç tutuşur, antibakteriyel...vs) teknik tekstillerin elde edilebileceği düşünülmektedir. Bu sebeple bu araştırmada ftalosiyaninler hakkında genel bilgi verilip, tekstil materyallerinin renklendirilmesi ve antibakteriyel özellik kazandırılması üzerine yapılmış bazı çalışmalar anlatılmıştır. Phthalocyanines are intensely blue-green-coloured, quite stable aromatic macrocyclic compounds having a two-dimensional 18-π electron conjugated system. Phthalocyanines are acquired various properties such as catalytic, electrochromic, electrical conductivity, photovoltaic, photo-conductivity, photo-absorbtion, photosensitizer by bonding most elements of the periodic table to central coordination cavity of macrocylic structure and by linking various functional substituents to peripheral or non-peripheral position of aromatic structure. It is thought that technical textiles having different functional properties, e.g.; antibacterial, fire retardant, can be obtained by also using various phthalocyanine derivatives except traditional copper phthalocyanine pigment in colouration of textile materials. For this reason, in this research general knowledge about phthalocyanines were given then some studies about their usage in textile material colouration and being achieved antibacterial properties were told.