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Leather light stability/tannins antioxidant characteristics for leather made with vegetable tannins/MUF resins / B. George in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 1 (01/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 1 (01/2004) . - p. 1-11 Titre : Leather light stability/tannins antioxidant characteristics for leather made with vegetable tannins/MUF resins Type de document : texte imprimé Auteurs : B. George, Auteur ; C. Triboulot, Auteur ; C. Simon, Auteur ; Antonio Pizzi, Auteur Année de publication : 2004 Article en page(s) : p. 1-11 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A new sulphonated melamine-urea-formaldehyde (MUF) polycondensation resin of relatively low melamine content, prepared according to a sequential formulation, has been shown to be highly effective when coupled with different natural vegetable tannins to produce leather with the same good characteristics of leather prepared with chrome salts. The variation of leather colour as a function of ageing time on prolonged irradiation with UV light of the leather produced with different combinations of veg tannins/MUF resins has been reported. A predictive model and equation for the variation of leather colour as a function of ageing time has also been established and is presented. The variation of leather colour as a function of ageing time has been correlated with both the antioxidant capability of pure tannins in solid form, and with their antioxidant capability in situ within the leather prepared with them. En ligne : https://drive.google.com/file/d/1qAUths_-DVXLk0Qcix-oEjeiMYOXVrYg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4171 [article]

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A simple and effective method for Cr(VI) analysis in dyed leathers / R. Ganeshjeevan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 1 (01/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 1 (01/2004) . - p. 12-15 Titre : A simple and effective method for Cr(VI) analysis in dyed leathers Type de document : texte imprimé Auteurs : R. Ganeshjeevan, Auteur ; Raghavan Chandrasekar, Auteur ; S. Shanmuga Priya, Auteur ; Ganga Radhakrishnan, Auteur Année de publication : 2004 Article en page(s) : p. 12-15 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Spectrophotometric detection of Cr(VI) by 1,5-diphenylcarbazide derivatization method recommended by the IUC-18 protocol suffers seriously due to the interference of colorants present in dyed leather extracts. Recently a C-18 reverse phase cartridge clean up for the color removal was recommended but the method has limitations. The present paper suggests an alternate material, which serves better for the removal of interfering colors. This method is rapid, very effective, and economic for the detection of Cr(VI) in finished leathers. En ligne : https://drive.google.com/file/d/1ttG-bU7UwAsMPVTEnfdl-6UQMtUsg_QX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4172 [article]

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Extraction of proteins from chrome shavings with sodium hydroxide and reuse of chromium in the tanning process / Soufiane Tahiri in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 1 (01/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 1 (01/2004) . - p. 16-25 Titre : Extraction of proteins from chrome shavings with sodium hydroxide and reuse of chromium in the tanning process Type de document : texte imprimé Auteurs : Soufiane Tahiri, Auteur ; J. Mabrour, Auteur ; S. Alami. Younssi, Auteur ; M. Azzi, Auteur ; A. Messaoudi, Auteur ; A. Albizane, Auteur ; M. Bouhria, Auteur Année de publication : 2004 Article en page(s) : p. 16-25 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this work, the alkaline digestion of chrome shavings with sodium hydroxide was studied. We have demonstrated that the best operating conditions would be about 0.5M for NaOH concentration and 15 minutes for the reaction. The process allows the recovery of proteins in the aqueous phase and the metallic salts in the solid phase (cake). Solid proteins with a high nitrogen percentage and a very low chrome content are recovered after lyophilisation of the liquid. Chemical treatment was used to purify the chrome cake for recycle. The purified chromium was transformed to basic chromic sulfates with basicity 33°S and tanning tests, using cattle hides and goat skins, were carried out to study the tanning capability of the reused product. Characteristics such as chromium oxide content and shrinkage temperature were determined. Apparent quality of obtained leather (penetration of chromium into skins, colouring and firmness of samples in wet blue stage) was also studied. En ligne : https://drive.google.com/file/d/1nrzFBJjA3vCK3JW3anaDm2COJ__uXL3W/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4173 [article]

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Use of sodium silicate to improve the environmental aspects of traditional chrome tanning : development of a semi-industrial scaled process for high-quality bovine upper leather / A. d'aquino in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 1 (01/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 1 (01/2004) . - p. 26-36 Titre : Use of sodium silicate to improve the environmental aspects of traditional chrome tanning : development of a semi-industrial scaled process for high-quality bovine upper leather Type de document : texte imprimé Auteurs : A. d'aquino, Auteur ; G. d'Elia, Auteur ; Maurizia Seggiani, Auteur ; Sandra Vitolo, Auteur ; Biagio Naviglio, Auteur ; M. Tomaselli, Auteur Année de publication : 2004 Article en page(s) : p. 26-36 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : As an alternative to the traditional process, a tanning process for light skins has been developed based on a two-step procedure in which a soluble sodium silicate ("water glass") is used as stabilizing agent and chromiumsalts are successively dosed to complete the tanning process. In a preliminary investigation on a laboratory scale, not only the stabilization effect of silicate has been confirmed (shrinkage temperature of the skins around 65°C) but also its capability of allowing a better penetration and fixation of chromium salts (half the dosage usually adopted in traditional chromium tanning was sufficient to obtain a final shrinkage temperature >100°C). Following the laboratory phase, in which the optimal dosages and procedures have been set up, the tanning procedure has been validated on a semi-industrial scale. Among four commercial sodium silicate solutions, one has been selected that has revealed the best performance. Following the optimal recipe (sodium silicate offer 1.5 % as SiO2 pickled weight basis; chromium salt offer 1.5% as Cr2O3 pickled weight basis) the final leather obtained, after a standard fatliquoring/dyeing treatment, showed very good organoleptic and physic-mechanical properties, quite similar to chrome tanned leather. The environmental improvements of the process consist in the preliminary stabilization of the leather so that it can be shaved by obtaining chromium free wastes; besides, the significant reduction of the chromium offer results in a drastic reduction of the chromium content (about one third of the amount typically present in the exhaust float of chromium tannage) of the exhaust effluent. This paper reports also the results of scanning electron microscopy (SEM) coupled with energy x-ray dispersion (EDX) used as investigations methods to follow the tanning process steps. En ligne : https://drive.google.com/file/d/1p9RC8PQgDjIhOWGVlaEpShKQdjqyz_jC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4174 [article]

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