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Enhancing the wash fastness of disperse dyes on wool with oxidants / Steven J. McNeil in COLORATION TECHNOLOGY, Vol. 136, N° 3 (06/2020)
[article]
Titre : Enhancing the wash fastness of disperse dyes on wool with oxidants Type de document : texte imprimé Auteurs : Steven J. McNeil, Auteur ; Larissa I. Zaitseva, Auteur Année de publication : 2020 Article en page(s) : p. 231-243 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de blanchiment
Colorants dispersésCatégorie de colorants très peu solubles dans l'eau, utilisés à l'origine comme colorants pour l'acétate, et qui généralement sont appliqués sous forme de suspensions aqueuses de faible concentration.Les colorants dispersés sont largement utilisés dans la teinture de la plupart des fibres manufacturées, surtout le polyester.
Laine
Oxydants
Peroxyde d'hydrogèneLe peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales.
Persulfate d'ammonium
Polyesters
Résistance au lavage
Teinture -- Fibres textilesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Disperse dyes are not currently applied to wool commercially, in large part because of inadequate wash fastness, but they do have potential, especially for wool-polyester blends. In this study, for the first time hydrogen peroxide was investigated to increase the wash fastness of disperse dyes on wool. In the absence of oxidants, 10 disperse dyes from seven classes imparted colours with a range of depths (K /S 2-26) with wash fastness (grey scale ratings for colour change) grades of 3 to 4-5. Hydrogen peroxide had only small effects on colours and gave only small enhancements to wash fastness, which were limited to anthraquinone, nitrodiphenylamine, disazo and coumarin dyes. The bleach activators Prestogen W and citric acid enhanced the bleaching effect of hydrogen peroxide but did not assist with raising wash fastness. Hydrogen peroxide in post-dyeing scouring made the dyeings brighter but did not significantly enhance wash fastness. Ammonium persulphate, which was included for benchmarking with earlier studies, yellowed the wool and decomposed some dyes. This study extends the range of dye classes whose wash fastness on wool can be improved by ammonium persulphate to now include diazo, coumarin and methine, and confirms that oxidants/free radical initiators have potential for enabling the disperse dyeing of wool. Note de contenu : - EXPERIMENTAL : Materials - Methods - Measurements
- RESULTS
- DISCUSSION : Effect of concentration of oxidant during dye exhaustion - Dyeing in the presence of activated HP - HP in the post-dyeing scouring bath - Six classes of disperse dye with single levels of HP and APSDOI : https://doi.org/10.1111/cote.12453 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12453 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34296
in COLORATION TECHNOLOGY > Vol. 136, N° 3 (06/2020) . - p. 231-243[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21787 - Périodique Bibliothèque principale Documentaires Disponible The application of biosurfactants for scouring wool / Samuel J. Leighs in COLORATION TECHNOLOGY, Vol. 135, N° 1 (02/2019)
[article]
Titre : The application of biosurfactants for scouring wool Type de document : texte imprimé Auteurs : Samuel J. Leighs, Auteur ; Steven J. McNeil, Auteur ; Steve L. Ranford, Auteur Année de publication : 2019 Article en page(s) : p. 48-52 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Avoine et constituants
Biosurfactants
Fibres textiles -- Lavage
Laine brute
SaponinesIndex. décimale : 677.3 Fibres animales Résumé : The first investigation of the use of biosurfactants for the scouring of raw wool is reported. A saponin, and a recently developed surface active oat extract, were evaluated at the laboratory scale using a first-to-be-reported benchtop scouring system with simulated flowback. The levels of contaminants remaining on the wool after bioscouring, along with the wool colour, were compared with those of wool that had been laboratory-scoured with a surfactant used in the commercial scouring of raw wool, namely a synthetic nine molar poly(oxyethylene)nonylphenyl (NPEO). Both biosurfactants can be extracted from land-based renewable crops. The saponin proved to be effective, producing low levels of residual contaminants on the wool, and colours that were not statistically different to those of wool scoured with NPEO. The oat extract was considerably less effective than the saponin, both in terms of colour and residual contaminant level. This study demonstrated the significant potential of biosurfactants in the scouring of the global greasy wool clip, which now comprises two billion kg per annum. Note de contenu : - EXPERIMENTAL : Materials - Scouring procedure - Test methods
- RESULTS AND DISCUSSION : Residual grease on wool - Wool ash - Wool colour - Implications of these findingsDOI : 10.1111/cote.12370 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12370 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31665
in COLORATION TECHNOLOGY > Vol. 135, N° 1 (02/2019) . - p. 48-52[article]Réservation
Réserver ce document
Exemplaires (2)
Code-barres Cote Support Localisation Section Disponibilité 20582 - Périodique Bibliothèque principale Documentaires Disponible 20583 - Périodique Bibliothèque principale Documentaires Disponible