Investigation into the reaction of reactive dyes with carboxylate salts and the application of carboxylate-modified reactive dyes to cotton / David M. Lewis in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 1 (02/2022) . - p. 58-70 Titre : Investigation into the reaction of reactive dyes with carboxylate salts and the application of carboxylate-modified reactive dyes to cotton Type de document : texte imprimé Auteurs : David M. Lewis, Auteur ; Peter J. Broadbent, Auteur ; Chris M. Carr, Auteur ; Wei D. He, Auteur Année de publication : 2022 Article en page(s) : p. 58-70 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Carboxylate Citrate de sodium Colorants -- Synthèse Colorants réactifs Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Fixation (chimie) Formiate de sodium Impression jet d'encre Impression sur étoffes Orange (couleur) Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Ink-jet printing of cellulosic fabrics with reactive dyes typically requires that the fabric is pretreated with alkali, prior to printing, to facilitate efficient fixation of the dye. In this paper we evaluate the use of sodium formate and other carboxylate salts as a neutral (pH 6.5) pretreatment process. The thickened, prepared-for-print pad liquor contained at least 50 gdm−3 of the selected carboxylate salt and was applied to the cotton fabrics by a pad-dry procedure. The fabric was then ink-jet printed with reactive dye inks, followed by standard steaming and washing-off processes. The pH of the carboxylate salt pretreatment was 6.5 and the aqueous extracts from the print fabrics at the end of the steaming process remained at pH 6.5. It was observed that even at pH 6.5, in the presence of selected carboxylates, significant reactive dye fixation could be achieved on a cotton substrate, whereas in the absence of the carboxylate, very little or even zero fixation was achieved. Infrared and capillary electrophoresis analyses of model reactions of reactive dyes with the carboxylate salts indicated that reactive ester residues were formed, and which subsequently promoted reaction with the cellulosic substrates. In addition to improving reactive dye fixation in ink-jet printing, the carboxylate-modified dyes were also demonstrated to improve long-liquor dyeing properties on cotton substrates. As an extension of this carboxylate-based printing process, the incorporation of lithium acetate (100 gdm−3) into the ink formulation was further studied and it was demonstrated that the necessity for a preparative pretreatment process could be eliminated. Note de contenu : - EXPERIMENTAL AND METHODS : Materials - Synthesis of a model SES dye - Model SES dye reaction with sodium formate - Model SES dye reaction with sodium citrate - Modification of commercial reactive dyes with sodium formate and sodium citrate - Cotton fabric preparation for subsequent ink- jet printing- Laboratory- ased, ink-jet printing application - Long-liquor dyeing Fixation - FTIR analysis - CE analysis of reactive dyes - RESULTS AND DISCUSSION : Activator evaluation - Ink-jet prints showing the effect of activators - "All-in" system for ink-jet printing with reactive dye-based inks - FTIR analysis of reactive dyes modified with carboxylates - CE analysis of selected commercially available reactive dyes and their carboxylate derivatives - Table 1 : Capillary electrophoresis (CE) analysis of formate- and citrate- modified Remazol Red RB and Remazol Brilliant Orange 3R reactive - Table 2 : Capillary electrophoresis (CE) analysis of formate- modified Cibacron Blue FR and Cibacron Red FB reactive dyes - Table 3 : Fixation and colour yield values following long- liquor dye application of 1%- 2% owf Remazol Red RB dye and carboxylate dye derivatives to cotton fabric - Table 4 : Fixation and colour yield values following long- liquor dye application of 1%- 2% owf Cibacron Red FB dye and carboxylate dye derivatives to cotton fabric DOI : https://doi.org/10.1111/cote.12571 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12571 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37499 [article]

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