Expanding the practical approach for salt-free tanning / M. Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 6 (06/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 6 (06/2024) . - p. 279-289 Titre : Expanding the practical approach for salt-free tanning Type de document : texte imprimé Auteurs : M. Sathish, Auteur ; Surojit Manna, Auteur ; Nakkala Gopi Krishna, Auteur Année de publication : 2024 Article en page(s) : p. 279-289 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alumine Carbonate de sodium Le carbonate de sodium est un composé chimique ayant pour formule Na2CO3. Il s'agit d'un sel de sodium de l'acide carbonique. Dans le langage courant, on parle aussi de soude ou de cristaux de soude, à cause de son contenu en sodium et de sa forme habituellement cristalline. Par contre, il ne faut pas confondre le carbonate de sodium avec la soude caustique ou encore avec le bicarbonate de soude. Phénol Syntans Tannage combiné Le tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en Å“uvre par exemple Chrome-Végétal ou Chrome-Synthétique Tannage minéral Tannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium Tannage sans sels Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Our research group previously established a practical approach for salt-free chromium tanning by changing the order of addition of masking salts (COAMS) for electrolyte-cum-masking effect. The present work deals with the modified COAMS process for developing a salt-chromium-free tanning system using aluminium. The tanning conditions such as Al to masking salt (cirtate) ratio, Al2O3 offer, the effect of phenolic syntan, and its order of addition on tanning performance have been studied in detail. It was found that the addition of 3% sodium carbonate (based on the weight of aluminium sulfate) along with aluminium sulfate reduces the acidity without affecting the tanning performance and leather quality. The ideal conditions for the pickle-free aluminium tanning were found to be 1.5% Al2O3 offer, 5% phenolic syntan offer, and an Al to citrate ratio of 1:0.2. It was also found that the order of addition of phenolic syntan did not affect the tanning performance. Furthermore, in comparison to leather produced without syntan, the combined effect of aluminum and phenolic syntan raises the shrinkage temperature by 6°C (Without syntan: 74°, with syntan80°) and decreases the rate of shrinkage by 74%. However, the addition of phenolic syntan did not improve Al exhaustion and leaching resistance to water. The physical characteristics and fiber compactness have been improved by the addition of phenolic syntan. SEX-EDAX study reveals that the aluminum is uniformly distributed throughout the cross-section. Note de contenu : - MATERIALS AND METHODS : Optimization of aluminium to masking salt ratio - Effect of phenolic syntan on tanning Performance - Changing the order of addition of phenolic syntan on tanning performance - Optimization of Al2O3 offer - Optimized tanning process - Analysis of aluminium leaching - Hydrothermal shrinkage temperature measurements - Physical strength characteristics and SEM analysis - RESULTS AND DISCUSSION : Salt-free aluminium tanning – Process strategy - Optimization study - Leaching study - Rate of hydrothermal shrinkage - Physical strength characteristics - SEM analysis - Table 1 : Process recipe for salt-chromium-free tanning Raw material : Goat delimed pelts, Thickness (Neck) : ~ 1.5 mm - Table 2 : Post-tanning process recipe (Thickness : 1.0 mm) - Table 3 : Optimization of Al2O3 offer - Table 4 : Physical strength characteristics of salt-free aluminium tanned leather with and without syntan treatment DOI : https://doi.org/10.34314/p2bkbr74 En ligne : https://drive.google.com/file/d/1GARAXNsKqoB6V91A0FLew0yaHND2til-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40989 [article]

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