Synthesis of several new pyridine21H thiones containing an arylazo function and their applications in textile printing

• Published in: Pigment & resin technology 2008-03, Vol.37 (2), p.80-86
• Main Authors: ElKashouti, M.A., El Molla, M.M., Elsayad, H.S., Ahmed, K.A., Helal, M.H., Elgemeie, G.H.
• Format: Article
• Language: English
• Subjects: Dyes; Printers; Textiles
• ISSN: 0369-9420
• DOI: 10.1108/03699420810860428

Purpose To synthesise several new pyridine21Hthione containing an arylazo function and their applications in textile printing. Designmethodologyapproach To prepare substituted 5arylazopyridine21Hthione by the coupling of diazonium salts of aniline derivatives with dibenzoyl methane 1,3diphenyl1,3propanedione to form arylhydrazone of dibenzoylmethane which react with cyanothioacetamide in boiling ethanolic sodium ethoxide to yield the 5arylazo21Hpyridinethione derivatives. The printing properties by screen printing or transfer printing technique of these dyes are reported by using sodium alginate as thickening agent. Findings The structure of 5arylazopyridine21Hthione dyes were established and confirm for the reaction products on the basis of their element analysis and spectral data MS, IR and 1HNMR. The suitability of the prepared dyestuffs for either heat transfer printing or traditional printing on polyester and nylon 6 fabrics has been investigated. The prints obtained from dyes possess highcolour strength as well as good overall fastness properties. Research limitationsimplications Synthesis of azo dyes containing pyridinethiole moiety has never been reported in textile printing. Practical implications Production of simple and less costly dyes. Originalityvalue 5arylazo pyridine21Hthione, the result of our work aimed to define the scope of and limitation of our procedures for the synthesis of novel 5arylazopyridine21Hthione.