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STUDY REGARDING THE OPTIMIZATION OF WOOL DYING WITH NATURAL DYES EXTRACTED FROM GREEN WALNUTS PART 1: DETERMINATION OF THE EFFICIENCY OF THE DYING TREATMENT

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Author(s): M. Pustianu | M. Chindriş | A. Popa | E. Airinei | A. Bucevschi | C. Sîrghie | M. Dochia

Journal: Annals of the University of Oradea. Fascicle of Textiles, Leatherwork
ISSN 1843-813X

Volume: XIV;
Issue: 1;
Start page: 167;
Date: 2013;
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Keywords: adsorbed dye | exhaustion | wool | naphtocquinone | Juglonine

ABSTRACT
In this work it has been verified the efficacy of the treatment of the wool dyeing with dye extracted from green walnuts husks using three methods: determination of the concentration of the dye adsorbed in fibre; determination of total exhaustion and determination of dyeing resistances at 400C washing. Using the values obtained for dye concentration absorbed in fibre were established the optimum working parameters for dying process with dye extracted from green walnuts husks.The husks of green nuts has compounds from naphthoquinones namely juglone (5 hydroxy-1,4 naphthoquinone), red-brown crystals with m.p. = 1550C. This is in the form of leuco compound which oxidizes in air, becoming dark-brown [1]. Juglone (5 hydroxy-1, 4 naphthoquinone) crystallizes in benzene - petroleum ether, being in a state of 4β-D glucozido-1,4,5-trihydroxynaphthaleno (α-hydrojuglone) and as a mixture of α and β - hydrojuglone with tannins. [2, 3, 4 ]The free Juglone is unstable and is rapid polymerizate. It goes in black brown color matters which color the textile fibres in shades of brown.The study has followed the extraction of natural colorant from green nuts and its characterization through spectral and chromatography analysis techniques. Using the chromatography technique, it was observed the presence of a single coloured spot in brown, the characteristic color of juglone. Analyzing the obtained UV-VIS and IR spectra, it was observed the presence of characteristic groups of compounds 5 hydroxy -1.4 naphthoquinones.
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