[article]
| Titre : |
An eco-benign tanning system using aluminium, tannic acid, and silica combination |
| Type de document : |
texte imprimé |
| Auteurs : |
N. N. Fathima, Auteur ; Balachandran Unni Nair, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Subramani Saravanabhavan, Auteur |
| Année de publication : |
2004 |
| Article en page(s) : |
p. 73-81 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
One of the best ways to combat chrome pollution is to avoid chromium itself in tanning. With this view, a chrome-free combination tanning system has been established using aluminium, tannic acid, a precursor to vegetable tannins and silica. Since tannic acid has low molecular weight compared to vegetable tannins, it can be successfully used to make a variety of leathers and the problems associated with vegetable tannins like hard biodegradability of tannins, fullness and darkness of leathers can be avoided. The presence of aluminium not only improves the hydrothermal stability of leather but also gives a pleasant pastel color to the leather due to the formation of aluminium-tannic acid complex, which produces colour in the matrix thus leading to the concept of natural dyeing. The fastness properties of the color obtained have been studied and have been found to be significantly good. The presence of silica in the combination system gives rise to softness and fluffiness. The amount of tannic acid, aluminium sulfate and sodium metasilicate has been chosen as 10, 5, and 5% (on pelt weight), respectively. In order to avoid pollution due to pickling operation, pickle-less tanning has been carried out. Both upper and garment leathers have been made and the characteristics of the same have been studied. The shrinkage temperature of the leathers obtained from this combination tanning system is about 95°C. The physical strength characteristics and the organoleptic properties of the leathers obtained are on par with or better than the conventional chrome tanned leathers. The effluent arising from this tanning system has been analyzed for its environmental impact. The exhaustion of aluminium is about 98%. Also, there is significant reduction in the COD and TDS. Thus, an eco-benign chrome-free combination tanning system has been established. |
| En ligne : |
https://drive.google.com/file/d/1r-90QymqgKFRS1dTnYGfvzvHwoxG55AG/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4182 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 2 (02/2004) . - p. 73-81
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An eco-benign tanning system using aluminium, tannic acid, and silica combination in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 2 (02/2004)
