Green synthesis of reactive dye for ink-jet printing in COLORATION TECHNOLOGY, Vol. 136, N° 2 (04/2020)

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 2 (04/2020) . - p. 110-119 Titre : Green synthesis of reactive dye for ink-jet printing Type de document : texte imprimé Année de publication : 2020 Article en page(s) : p. 110-119 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Chauffage Chloropyrimidine Colorants -- Synthèse Colorants réactifs Encre Impression sur étoffes Micro-ondes Photostabilité Résistance au lavage Vert Index. décimale : 667.3 Teinture et impression des tissus Résumé : Chloropyrimidine-based reactive dyes are reported as well suited to textile printing; however, nucleophilic aromatic substitution of chloropyrimidines with amino-containing chromophores is slow and often suffers from poor yields. In this study, a novel and simple method was developed for the synthesis of chloropyrimidine-based reactive dye under microwave irradiation. In addition, the dye was also synthesised by conventional heating for comparison, which took both the reaction time and yield into account. The progress of the synthesis reactions concerned were monitored using capillary electrophoresis and the purity of the dye obtained was assessed by thin-layer chromatography. The structure of the synthesised trichloropyrimidine dye was confirmed by Fourier Transform–infrared spectroscopy and elemental analysis. It was found that the reaction rate of the nucleophilic aromatic substitution carried out under microwave irradiation was 4-fold faster than that carried out under conventional heating, although the enhancement in product yield was modest. These results suggest that microwave irradiation is an effective technique for the synthesis of chloropyrimidine-based reactive dyes. The synthesised chloropyrimidine dye was formulated into an ink and applied onto a wool fabric by ink-jet printing. The printed fabrics were steamed at 102°C for 5-25 minutes at 5-minute intervals. Good K/S and rate of dye fixation were obtained, both of which improved with increasing steaming time. The prints obtained exhibited reasonably good light and wash fastness properties. Note de contenu : - EXPERIMENTAL : Materials - Methods and instrumentation - Synthesis of yello 7-[(4-amino-2-methylphenyl)azo]-1,3-naphthalenedisulphonic acid dye (chromophore) - Synthesis of yello 7-[2,5,6-trichloro-4-pyrimidinyl)amino]-2-[(methylphenyl)azo]-1,3-naphthalenedisulphonic-acid dye - Ink-jet printing procedure - Measurement of K/S - Measurement of dye fixation - Colour fastness testing - RESULTS AND DISCUSSION : Microwave irradiation versus conventional heating - Characterisation of yellow chromophore and dye 1 via microwave irradiated synthesis - Printing properties - Table 1 : Comparison of reaction time and yield using microwave irradiation and conventional heating DOI : https://doi.org/10.1111/cote.12450 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34230 [article]

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