Browsing by Author "Lukanova V.R."

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    INVESTIGATIONS ON THE DYEING ABILITY OF SOME REACTIVE TRIAZINE AZO DYES CONTAINING TETRAMETHYLPIPERIDINE FRAGMENT
    (2017-01-01) Miladinova P.M.; Lukanova V.R.
    Three monofunctional reactive triazine dyes, containing tetramethylpiperidine fragment and an identical chromophore, but different reactive group (chlorotriazine or allylamine/allyloxy), were used for dyeing cotton and wool with the application of different methods of dyeing: exhaust, pad-batch and printing. The degree of exhaustion and fixation, as well as the fastness properties of the dyed samples in respect to washing, acidic and alkaline perspiration, dry and wet rubbing and light fastness were assessed. The influence of the dye bath temperature on the percentage of exhaustion and color intensity was determined. It was found that the monochlorotriazine reactive dye may be used for dyeing cellulosic textile materials, while the most suitable were the methods of exhaust at 80°C, pad-dry, pad-dry-steam, cold pad-batch and printing. The dyes containing an allylic group were found applicable to wool dyeing with the application of the method of exhaust at 80°C. The investigated dyed samples showеd good light fastness properties.
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    On the synthesis and application of some mono- and dis-azo acid dyes
    (2016-01-01) Miladinova P.M.; Vaseva R.K.; Lukanova V.R.
    The present paper describes the synthesis of two novel mono azo dyes of a yellow colour and four novel dis-azo dyes of orange and red colours. The dyes are obtained by the commonly accepted procedure - diazotization and coupling reactions. The compounds are isolated and characterized by TLC (Rf values), UV/Vis and IR spectra and conformed by proton NMR spectroscopy. The dyeing performance of the dyes obtained is evaluated on wool fabrics where their fastness properties of washing, rubbing and perspiration are determined in view of their exhaustion and fixation. The results obtained show good to excellent fastness properties on wool.