Low-water-soluble reactive dyes for application in ultrafine polyamide/polyurethane synthetic leather / Dexiang Li in COLORATION TECHNOLOGY, Vol. 140, N° 2 (04/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 2 (04/2024) . - p. 252-261 Titre : Low-water-soluble reactive dyes for application in ultrafine polyamide/polyurethane synthetic leather Type de document : texte imprimé Auteurs : Dexiang Li, Auteur ; Wei Ma, Auteur ; Bingtao Tang, Auteur ; Shufen Zhang, Auteur Année de publication : 2024 Article en page(s) : p. 252-261 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants réactifs Cuir synthétique Cuirs et peaux -- Teinture Polyamides Un polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine. Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères. Polyuréthanes Solidité de la couleur Index. décimale : 667.2 Colorants et pigments Résumé : Ultrafine polyamide/polyurethane synthetic leather (UP/PSL), with a highly natural leather-like appearance and touch, is widely used in many leather commodities. Generally, acid dyes, which are mostly used for dyeing UP/PSL, exhibit poor colour fastness. While, reactive dyes are well-known for their good colour fastness. However, reactive dyes are not used to dye UP/PSL because they are water-soluble and cannot stain the polyurethane (PU) in UP/PSL. In this study, five low water-soluble reactive dyes with good affinity for both polyamide (PA) and PU were synthesised and characterised using ultraviolet-visible and infrared spectroscopy, and mass spectrometry. All low-water-soluble reactive dyes were monoazo dyes with only one sulfonic group and two different functional groups. The reactive dyes were used to dye UP/PSL at 98°C and fixed at 90°C with 7-azatridecane-1,13-diamine as a crosslinking agent. For comparison, Eriofast Red-2B (ER-2B) was used to dye UP/PSL using a special dyeing procedure. ER-2B showed severe issues related to low utilisation and uneven dyeing, whereas the five low water-soluble reactive dyes exhibited better performance than ER-2B. Both the exhaustion and fixation of dyes 1 and 4 exceeded 90.0% when the dosage was less than 3.0% owf (on weight of fabric). In addition, they exhibited good levelling. The washing fastness of the five reactive dyes was excellent and higher than grade 4. The dry rubbing fastness was higher than grade 3-4. Therefore, UP/PSL can be satisfactorily dyed using the reactive dyes with a solubility of less than 1.0 g/L and meet the requirements of daily life applications. Note de contenu : - MATERIALS AND METHODS : Chemicals and instruments - Preparation of reactive dyes with low solubilities - Dyeing process - Measurements of colour strength and fastness - Dyeing results of PU in UP/PSL with low water-soluble reactive dyes and ER-2B - RESULTS AND DISCUSSION : Structures and UV-vis absorption spectra of the low water-soluble reactive dyes - Results of dyeing UP/PSL with low water-soluble reactive dyes - Colour fastness of UP/PSL dyed with five low water-soluble reactive dyes DOI : https://doi.org/10.1111/cote.12692 En ligne : https://drive.google.com/file/d/10-sAJ3RcR8wrRTGti-sf8xWLZ9y5Ww0i/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40941 [article]

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Syntheses and dyeing properties of novel water-soluble reactive sulphur black dyes / Zhengyang Gao in COLORATION TECHNOLOGY, Vol. 140, N° 3 (06/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 3 (06/2024) . - p. 403-411 Titre : Syntheses and dyeing properties of novel water-soluble reactive sulphur black dyes Type de document : texte imprimé Auteurs : Zhengyang Gao, Auteur ; Wei Ma, Auteur ; Bingtao Tang, Auteur ; Shufen Zhang, Auteur Année de publication : 2024 Article en page(s) : p. 403-411 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Colorants -- Propriétés tinctoriales 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). Essais (technologie) Noir (couleur) Soufre Teinture -- Fibres textiles Teinture au tampon Index. décimale : 667.2 Colorants et pigments Résumé : The practical application of a sulphur black dye relies on its ability to dye cotton fibres with pure black colour and maintain the colour with high light fastness. Here, we report a synthesis method to prepare a novel water-soluble reactive sulphur black dye. The approach involves the reduction of CI Sulphur Black 1 to its leuco form and subsequent reaction with a water-soluble intermediate containing reactive groups synthesised from amino acid and cyanuric chloride. The optimal carboxyl and reactive group content of the water-soluble reactive sulphur black dye is 141 mmol/100 g, and the water solubility can reach 92 g/L. The fixation of the reactive sulphur black dye on cotton reaches 89% in a pad dyeing process without using sodium sulphate. The reactive sulphur black dye can achieve a light fastness of grade 6-7, a dry rub fastness of grade 4 and a wet rub fastness of grade 2, comparable or higher than the conventional CI Sulphur Black 1. The dyeing results showed that the novel water-soluble reactive sulphur black dye has excellent performance and good application prospects. Note de contenu : - EXPERIMENTAL : Reagents and instruments - Synthesis of water-soluble reactive sulphur black dyes - Characterisation of water-soluble reactive sulphur black dye - Dyeing process - Dye fixation of the pad dyeing process - Test method for colour and fastness - RESULTS AND DISCUSSION : Synthesis of water-soluble reactive sulphur black dyes - Dyeing performance of the water-soluble reactive sulphur black dyes DOI : https://doi.org/10.1111/cote.12707 En ligne : https://drive.google.com/file/d/1vIZmqXIP5wThqrDeaw_qioiLZRiyMjca/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40958 [article]

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