[article]
| Titre : |
Development of a tanning process based on using hydrolyzated material collected from leather scrap |
| Type de document : |
texte imprimé |
| Auteurs : |
J. Muñoz, Auteur ; M. Maldonado V., Auteur ; A. Rangel-Serrano, Auteur |
| Année de publication : |
2002 |
| Article en page(s) : |
p. 83-88 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
Wet blue leather shavings are considered a waste material and represents between 6 to 12 % of the green, salted leather total weight. In practice it is usually combined with trimmings. This scrap is considered "hazardouswaste", due to the possibility of its chrome type III content (3 to 4%) converting into chrome(VI). Therefore, they are collected and confined only in authorized pits, which imposes extra expenditures upon manufacturers. Consequently, it is not rare for such waste to be clandestinely disposed. In this work, wet blue leather scraps were treated under acidic conditions (using sulphuric acid) at temperatures above 93 °C, until soluble chromium was obtained, together with protein hydrolyzed material(HA). HA showed a 2.3 g/l of chromium oxide content, and 16.2 g/l of total nitrogen. The HA chromium oxide value was raised to 6%, and it was used as a retanning agent for split leather, beginning at a pH value of 2.5 and ending at 3.5. HA was then compared to a standard process (ST) of 6% of chromium oxide, and a 2.5 pH value. Split leather retanned with HA showed 3.2 %, of chromium oxide versus 3.7% with ST, while total nitrogen content was 11.5% with HA, being 10.0% for ST. Physical properties of split leather retanned with HA, compared to those of leather from standard process, showed a shrink temperature of up to 100 °C, and split leather texture showed better softness and aspect. A benefit of 50% was then calculated for hydrolyzate protein, with savings between 15 and 20% in chromium oxide usage, an increase of 30% in tear strength, a reduction of 10% in elongation, and 30% increase in tensile strength. From an environmental point of view, these results provide an alternative for treatment and use of wet blue leather scraps, which in turn will allow an MOXICO. increased efficiency in reusing byproducts from the leather tanning process. |
| En ligne : |
https://drive.google.com/file/d/1jK3ooNeUKVx2yIe-7Nz1WQZm0gWsQgxB/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4327 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 2 (02/2002) . - p. 83-88
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Development of a tanning process based on using hydrolyzated material collected from leather scrap in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 2 (02/2002)
