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Tanning using basic chrome sulfate obtained from ash produced in the thermal treatment of leather wastes / Aline Dettmer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 9 (09/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 9 (09/2010) . - p. 280-288 Titre : Tanning using basic chrome sulfate obtained from ash produced in the thermal treatment of leather wastes Type de document : texte imprimé Auteurs : Aline Dettmer, Auteur ; Keila Guerra Pacheco Nunes, Auteur ; Nilson Romeu Marcilio, Auteur Année de publication : 2010 Article en page(s) : p. 280-288 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Tanning is the process which converts hide (putrescible) into leather (non-putrescible) material. Tanning wastes contain chrome that is classified as hazardous; consequently, finding satisfactory treatments or proper disposal is a fundamental necessity. Few studies on alternatives treatments for these wastes have addressed the thermal treatment of shavings and trimmings generated during the production process. The ash obtained in this process is rich in chromium oxide, which can be recovered and reused in the tanning process. Firstly, the method consists of obtaining sodium chromate, followed by the production of basic chromium sulfate that can be applied in leather tanning. Preliminary tests were carried out utilizing the tanning salt solution obtained from the ash in tanning hide powder experiments. Two simultaneous analyses were carried out using the product obtained in the laboratory and a commercial product sample, to confirm the efficacy of the salt obtained from the ash. Secondly, the sulfate obtained in the laboratory was applied in the tanning of hide samples, and again two simultaneous analyses were carried out. The results obtained in this work were satisfactory and the typical characteristics of tanned hides were achieved, that is, the hydrothermal stability of the tanned samples and their structure modification (distance between fibers) verified using electron microscopy. En ligne : https://drive.google.com/file/d/1sW9LL9OZHRST0yYE5-ricvo7QXpGJpvx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10506 [article]

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Water-based anionic sulfonated melamine formaldehyde condensate oligomer as retanning agent for leather processing / S. N. Jaisankar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 9 (09/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 9 (09/2010) . - p. 289-296 Titre : Water-based anionic sulfonated melamine formaldehyde condensate oligomer as retanning agent for leather processing Type de document : texte imprimé Auteurs : S. N. Jaisankar, Auteur ; Sanjeev Gupta, Auteur ; Y. Lakshminarayana, Auteur ; J. Kanakaraj, Auteur ; Asit Baran Mandal, Auteur Année de publication : 2010 Article en page(s) : p. 289-296 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This work deals with the synthesis of water-based anionic sulfonated melamine-formaldehyde condensate (SMFC) with very low free formaldehyde content by sequential formulation. The structure of the oligomeric SMFC has been confirmed using spectroscopic methods like FTIR and UV. Molecular weight of the condensates was determined by Gel permeation chromatography (GPC). These oligomers were then evaluated as retanning agents. Chrome tanned wet blue leathers were treated with SMFC in different proportions (1, 2 and 3% based on shaved weight) to optimize the use of the product for physical properties of leather including fullness and dye uptake. Further, the leathers were subjected to conventional dyeing and fatliquoring processes. Control experiments without SMFC were also undertaken to judge the efficacy of the product. The results showed that SMFC treated leather exhibited improved grain tightness, softness, fullness and dye uptake in the resultant leather. The most important aspect of the product was very low (<10 ppm) free formaldehyde content in the treated leather. En ligne : https://drive.google.com/file/d/1XpVC-h9MTVrHOFsUJZP86n_uBKqA-x0K/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10507 [article]

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Modern approach to automatic control of enzymatic hydrolysis of tannery waste / Vladimir Vasek in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 9 (09/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 9 (09/2010) . - p. 297-302 Titre : Modern approach to automatic control of enzymatic hydrolysis of tannery waste Type de document : texte imprimé Auteurs : Vladimir Vasek, Auteur ; Jan Dolinay, Auteur ; Petr Dostalek, Auteur ; Karel Kolomaznik, Auteur ; Dagmar Janacova, Auteur ; Lubomir Vasek, Auteur Année de publication : 2010 Article en page(s) : p. 297-302 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Total recycling of chromium-containing waste from tanning industry forms a compact technology that is aimed at solving the problem of the presence of chromium in both solid and liquid wastes generated during the leather manufacturing processes. If the technology is to provide a compact system usable in industrial practice it is necessary to provide a complex control based on advanced technical and software tools that enable the use of modern automatic control methods. For that purpose, a decentralized computer control system has been constructed in laboratory conditions at Tomas Bata University in Zlín, the properties of which allow its relatively easy transformation into industrial scale. The system consists of two main parts : a control system of the key technological processes-hydrolysis, filtration, evaporation, total de-chroming of both the filtration cake and spent liquor; and a superior central control unit which ensures supervision of the entire process. The control system is designed alternatively with respect to the use of various types of technical components and communication paths, which allows designing the final industrial system with the use of a selected automation and information technology. En ligne : https://drive.google.com/file/d/1KdqNfeWqZsqHWYZa70m1cJwW7-mjCHaA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10508 [article]

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Ecological technology : NMP-free leather finishing / J. Münter in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 9 (09/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 9 (09/2010) . - p. 303-308 Titre : Ecological technology : NMP-free leather finishing Type de document : texte imprimé Auteurs : J. Münter, Auteur ; R. Blach, Auteur Année de publication : 2010 Article en page(s) : p. 303-308 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : There were historically good reasons to use N-Methylpyrrolidone in leather finishing products, but compelling reasons to discontinue its use are now well known. Findings of reproductive toxicity lead to a new classification and labelling of NMP. This new knowledge led the state of California, in June 2001, to add NMP to the list of substances known to cause cancer or reproductive toxicity. This was the first toxicological listing of NMP but since then others have adopted legal restrictions, e.g. in the European Union. The current regulations of these compounds offer no limits. Even if a product contains minimum amounts of NMP it has to be labelled. So, for example, if a leather containing NMP in the finish is used for a car seat in California the instruction manual of the car has to include a warning label. When NMP is used in leather finishing almost 90% remains in the leather after drying, but is gradually released over a long period of time. This means that consumer products containing these leathers will release NMP and the end-user customer may be exposed to it. At an early stage Clariant realised that the use and acceptance of NMP must come to an end and that it will be a big and time-consuming challenge to replace it. So in 2001 our company started a research project for the replacement of NMP in all leather finishing products. There was no general possibility to replace NMP and fulfil all requirements. A lot of different specific solutions were necessary to surmount the production and application problems for NMP-free products. But, starting at the beginning of 2004, Clairant offered NMP-free finishing products that fulfilled even the high demands for automotive leather while meeting the new environmental requirements. By mid-2005 all of our standard products were free of NMP. En ligne : https://drive.google.com/file/d/1cIpbmoC_cQFkfG_lRfOwi0XjHOd3fIIS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10509 [article]

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