Application of ultrasound in eco-friendly fatliquoring of leather / Mohamed Abu Sayid Mia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 3 (03/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 3 (03/2024) . - p. 139-144 Titre : Application of ultrasound in eco-friendly fatliquoring of leather Type de document : texte imprimé Auteurs : Mohamed Abu Sayid Mia, Auteur ; Mohammad Nurnabi, Auteur ; Mohamed Zahangir Alam, Auteur Année de publication : 2024 Article en page(s) : p. 139-144 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Propriétés physiques Cuirs et peaux -- Teneur en matières grasses Emulsions Granulométrie Huiles et graisses Produits de nourriture du cuir Ultrasons Viscosité Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This article describes the effect of ultrasound on fatliquoring of leather. Preparations of fatliquor-emulsions as well as fatliquoring of leathers were carried out in presence of ultrasound. Ultrasound aids in reducing the size of fatliquor emulsion and increasing fat content of leather. It was found that the particle size of fatliquor emulsion was reduced by more than 22% and fat contents of leather were increased up to 40% due to using ultrasound. Moreover, smooth penetration and uniform distribution of fat in the processed leathers were observed. Physical properties of both ultrasoundassisted fatliquored leather and conventionally fatliquored leather were also studied in detail. Tensile strength, stitch tearing strength, tongue tearing strength, grain crack load, ball bursting load, Bauman tear strength, color fastness and perspiration of ultrasound assisted fatliquored leather were better compared to that of without ultrasound. Note de contenu : - EXPERIMENTAL : Materials - Experimental set-up - Fatliquoring of leather samples - Measurement of particle size - Measurement of viscosity - Determination of fat content - RESULTS AND DISCUSSION : Effect of sonication time on the particle size - Effect of ultrasound on the viscosity of fatliquor emulsions - Effect of ultrasound on fat content of leather - Physical properties of the fatliquored leathers - Fig. 1 : Structure of sulfited fatliquor component - Table 1 : Physico-chemical properties of leather fatliquored with 5% (w/v) Remsynol ESI emulsion using ultrasound and conventional method - Table 2 : Fastness properties of the fatliquored leather En ligne : https://drive.google.com/file/d/1bTmKIVoKbA-1_v3LAG0hKqGyhEHg7Bi2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40620 [article]

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Eco-friendly chrome tanning of leather using ultrasound technique / Mohamed Abu Sayid Mia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 2 (02/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 2 (02/2024) . - p. 80-90 Titre : Eco-friendly chrome tanning of leather using ultrasound technique Type de document : texte imprimé Auteurs : Mohamed Abu Sayid Mia, Auteur ; Shamima Yeasmin, Auteur ; Mohammad Nurnabi, Auteur ; Mohamed Zahangir Alam, Auteur Année de publication : 2024 Article en page(s) : p. 80-90 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption Caractérisation Cuirs et peaux de bovins Tannage au chrome Ultrasons Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This article describes the development of an environmentally friendly chrome tanning process of leather using ultrasound. Most of the leathers are tanned by the conventional method using basic chromium sulfate. It is one of the most polluting and time-consuming steps in leather processing. Investigations were carried out on ultrasound assisted eco-friendly tanning process so that the chrome tanning agent could provide better quality leather. Effects of using ultrasound in chrome tanning process were studied at different pH, tanning time, tanning agent dosage, and then compared with that of conventional method. Tanned leathers were characterized by scanning electron microscopy (SEM), photomicrographic analysis, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and energy dispersive X-ray (EDX). SEM analyses of the surface and cross-section of the tanned leather showed that fiber structures were not affected by ultrasound. It was also found that the shrinkage temperature of leather tanned with ultrasound was increased by about 5-29 °C. Chrome uptake and content were found to increase by 30-50% and 1-7%, respectively. Tanning time was shortened from 6 hours to 2 hours and the quantity of leachable chromium in ultrasound assisted chrome tanned leather was also decreased significantly. The noteworthy enhancing effects have been attributed largely because of the increased penetration of tanning agents into pickled leather. Photomicrographic analysis of the cross-section of the tanned leather also showed a higher penetration of tanning agents in presence of ultrasound. Note de contenu : - EXPERIMENTAL : Materials - Experimental set-up - Tanning procedure of cow pickled pelt - - Table 1 : Details of chrome tanning operation - Characterization of tanned leather - UV-visible spectrophotometry - Boiling test - Toxicity characteristic leaching procedure (TCLP) - RESULTS AND DISCUSSION : Effect of ultrasound on percent chromium uptake of leather - Effect of time on chromium uptake - Chromium content in the tanned leather - Thermogravimetric analysis of tanned leather - Differential scanning calorimetric analysis of tanned leather - Boiling test of tanned leather - Field emission scanning electron microscopic (FESEM) analysis - Diffusion of tanning agent - Determination of leachable chromium content - Estimation of environmental benefits - Table 1 : Details of chrome tanning operation - Table 2 : Percentage of area loss of chrome tanned leather by boiling test - Table 3 : Leachable chromium of tanned leather - Table 4 : Amount of chromium present in the spent tanning liquor DOI : https://doi.org/10.34314/jalca.v119i2.8325 En ligne : https://drive.google.com/file/d/147dBUkJ8K0JJW0dvpb0wkO3ZNt_peH0W/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40468 [article]

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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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