Eco-friendly leather dyeing using ultrasound technique / Mohamed Abu Sayid Mia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 6 (06/2020)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 6 (06/2020) . - p. 199-206 Titre : Eco-friendly leather dyeing using ultrasound technique Type de document : texte imprimé Auteurs : Mohamed Abu Sayid Mia, Auteur ; Refat E. Ashraf, Auteur ; Mohammad Nurnabi, Auteur ; Mohamed Zahnagir Alam, Auteur Année de publication : 2020 Article en page(s) : p. 199-206 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Caractérisation Coefficient de diffusion Un coefficient de diffusion est une grandeur caractéristique du phénomène de diffusion de la matière. Le coefficient de diffusion mesure le rapport entre le flux molaire dû à la diffusion moléculaire, et le gradient de concentration de l'espèce chimique considérée (ou, plus généralement, de la variable d'effort entraînant cette diffusion), comme formulé par la loi de Fick. Colorants -- Absorption Colorants acides Cuirs et peaux -- Propriétés physiques Cuirs et peaux -- Teinture Essais de résilience Essais dynamiques Microscopie électronique à balayage Morphologie (matériaux) Noir (couleur) Résistance à l'abrasion Résistance à la traction Résistance à la transpiration Rouge (couleur) Thermogravimétrie Ultrasons Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this study, leather was dyed using ultrasound and conventional methods to investigate the influence of ultrasound on leather dyeing. Ultrasound is more effective than mechanical agitation in enhancing leather dyeing. Effects of various process parameters, such as, dyeing temperature, dyeing time and doses of dye on dyeing of leather in presence of ultrasound were investigated. Dyed leathers were characterized with scanning electron microscopy (SEM), photomicrographic analysis, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), etc. It was observed that percentage exhaustion of dye, dye uptake, dye penetration and diffusion coefficient were increased significantly in presence of ultrasound compared to those of dyeing in absence of ultrasound. Moreover, physical properties of the dyed leathers were also investigated. Color rub fastness, perspiration, tensile strength, etc. of dyed leather in presence of ultrasound were higher than that of without ultrasound. SEM analyses of the surface and cross section of the dyed leather showed that fiber structure was not affected by ultrasound. Photomicrographic analysis of cross-section of the dyed leather also showed a deeper penetration of dye in presence of ultrasound. Consequently, dye content in the spent liquor was decreased resulting in a lower environmental pollution. Note de contenu : - EXPERIMENTAL : Materials - Experimental set-up - Dyeing of leather - Analysis of dye uptake and exhaustion - Characterization of dyed leather - RESULTS AND DISCUSSION : FT-IR analysis of dyes used in this study - Effect of time on dye uptake of leather - Percentage exhaustion of dye - Photomicrographic analysis of dyed leather - Diffusion coefficient - Morphology analysis - Thermogravimetric analysis of dyed leather - Differential scanning calorimetric analysis of dyed leather - Physical properties of the dyed leathers - Environmental benefits DOI : https://doi.org/10.34314/jalca.v115i6.3819 En ligne : https://drive.google.com/file/d/1oiP6QwmmA5m9OWcokk8xFuzodx5sP63r/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34321 [article]

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