Preparation and application of a β-cyclodextrin-disperse/reactive dye complex |
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Authors: | Stefania Parlati Roberto Gobetto Claudia Barolo Aldo Arrais Roberto Buscaino Claudio Medana Piero Savarino |
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Institution: | (1) Dipartimento di Chimica Generale ed Organica Applicata, Università di Torino, Corso Massimo d’Azeglio 48, 10125 Torino, Italy;(2) Dipartimento di Chimica IFM, Università di Torino, Via P. Giuria 7, 10125 Torino, Italy;(3) NIS Centre of Excellence, Università di Torino, Via P. Giuria 7, 10125 Torino, Italy;(4) Dipartimento di Chimica Analitica, Università di Torino, Via P. Giuria 5, 10125 Torino, Italy |
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Abstract: | A disperse and a disperse/reactive azo-dyes were prepared and characterised with spectroscopic methods. The complexes with
β-cyclodextrin were prepared by a dry milling method. The characterisation of the complexes in solid state was performed by
13C CP MAS NMR, FT-IR, Raman spectroscopies and TGA–DTA analysis. The presence of the complexes in solution was evidenced with
ESI-MS experiments. The products were used to dye synthetic (nylon, PET), natural (cotton) and cotton-PET blend fibres. Colour
intensity and uniformity were evaluated by means of tristimulous colorimetry. β-Cyclodextrin, used as additive in dyeing baths,
enhanced the colour intensity and uniformity of dyed samples. The complexes gave rise to a generalised good result. The disperse/reactive
dye showed better fastness to washing properties on nylon 6 and cotton fibres. β-Cyclodextrin easily substituted the surface
active agents, normally used in industrially dyeing processes, without loss in dyeing quality as dyeing uniformity, intensity
and washing fastness. |
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Keywords: | Azodyes β -Cyclodextrin complexes 13C CP MAS NMR Dyeing ESI-MS FT-IR Raman spectra TGA– DTA Tristimulus Colorimetry |
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