Leather ageing and hexavalent chromium formation as a function of the fatliquoring agent. Part I : chrome tanned leathers / Ramón Palop in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 5 (09-10/2008)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 5 (09-10/2008) . - p. 200-204 Titre : Leather ageing and hexavalent chromium formation as a function of the fatliquoring agent. Part I : chrome tanned leathers Type de document : texte imprimé Auteurs : Ramón Palop, Auteur ; Joan Parareda, Auteur ; Olga Ballùs, Auteur ; Agusti Marsal, Auteur Année de publication : 2008 Article en page(s) : p. 200-204 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir -- Effet du rayonnement ultraviolet Cuir -- Teneur en chrome hexavalent Cuirs et peaux -- Détérioration Cuirs et peaux -- Effets de la température Essais (technologie) Jaunissement (défaut) Produits de nourriture du cuir Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The aim of this work was to evaluate the influence of eighteen different types of fatliquoring agents on leather ageing. Temperature and ultraviolet light tests were conducted separately. The existence of a direct relationship between leather yellowing, diminution of shrinkage temperature, autoflammability and odour was confirmed. There was also a non-linear relationship between the above parameters and the iodine index of the fatliquoring agents. Hexavalent chromium was not formed when temperature tests were applied on neutralised and fatliquored leathers. The possible physicochemical mechanisms for this phenomenon are discussed. The temperature test exerted greater influence than the ultraviolet light tests on the aforementioned parameters. Note de contenu : - AIM OF THE WORK - EXPERIMENTAL PROCEDURES : Materials and methods - Evaluation of the treated samples - RESULTS AND DISCUSSION : Effect of temperature - Relationship between iodine number an the parameter evaluated - Table 1 : Process details - Table 2 : Fatliquoring agents used with their iodine index - Fig. 1 : Influence of temperature on yellowing - Fig. 2 : Influence of temperature on shrinkage temperature - Fig. 3 : Yellowing and detanning mechanisms - Fig. 4 : Plot of shrinkage temperature versus quantity of fixed chromium - Fig. 5 : Influence of temperature on denaturing temperature - Fig. 6 : Influence of temperature on odour - Fig. 7 : Influence of temperature on surface area variation - Fig. 8 : Influence of ultraviolet light on yellowing - Fig. 9 : Influence of ultraviolet light on shrinkage temperature Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35251 [article]

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Leather ageing and hexavalent chromium formation as a function of the fatliquoring agent. Part II : Chrome retanned leathers / Ramón Palop in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 6 (11-12/2008)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 6 (11-12/2008) . - p. 237-239 Titre : Leather ageing and hexavalent chromium formation as a function of the fatliquoring agent. Part II : Chrome retanned leathers Type de document : texte imprimé Auteurs : Ramón Palop, Auteur ; Joan Parareda, Auteur ; Olga Ballùs, Auteur ; Agusti Marsal, Auteur Année de publication : 2008 Article en page(s) : p. 237-239 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chrome hexavalent Cuir -- Effet du rayonnement ultraviolet Cuirs et peaux -- Détérioration Cuirs et peaux -- Effets de la température Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Produits de nourriture du cuir Retannage Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this second part, we assessed the influence of a chromium retanning process applied to wet-blue hides fatliquored with eighteen different fatliquoring agents on yellowing, detanning and Cr(VI) formation after exposure to the separate effects of temperature and ultraviolet light. The results obtained for chromium retanned leathers are compared with those of non-retanned leathers in Part I. The temperature test gave rise to less yellowing in chromium-retanned leathers than in non-retanned leathers. As for shrinkage temperature, there were no linear variations although a tendency to lower shrinkage in the retanned samples was observed. Amounts of hexavalent chromium varied as a function of the fatliquor type. It may be concluded that the oxidised chromium present resulted from residual or weakly fixed chromium from the retanning process. Regarding fastness to ultraviolet light, both yellowing and shrinkage temperature reduction were lower in chromium retanned leathers. Eight fatliquoring agents were selected in line with the results obtained. Their behaviour with respect to physical and organoleptic properties was compared with that of a sulphated triglyceride used as reference. The most suitable fatliquoring agents were suggested for four different leather articles. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials and methods - Evaluation of the treated samples - RESULTS AND DISCUSSION : Effect of temperature - Effect of light - BEHAVIOUR OF SELECTED FATLIQUORING AGENTS V. PHYSICAL AND ORGANOLEPTIC PROPERTIES : Comparison with a standard process - Results - CONCLUSIONS : Selection of fatliquoring agents for different leather articles - Table 1 : Process details - Table 2 : Fatliquoring agents used with their iodine index - Table 3 : Variation of the properties (%Δ) compared with the reference except fogging, which refers to the absolute values for each fatliquoring agent En ligne : https://drive.google.com/file/d/1U17gAnTjeWUhI1pnG6jm0c0MEj4I70j9/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38991 [article]

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Synthetic retanning agents / Ramón Palop in LEATHER INTERNATIONAL, Vol. 210, N° 4785 (06/2008)  

[article]  inLEATHER INTERNATIONAL > Vol. 210, N° 4785 (06/2008) . - p. 40-42 Titre : Synthetic retanning agents : Part 2 of an experimental study - colorimetric testing Type de document : texte imprimé Auteurs : Ramón Palop, Auteur ; Joan Parareda, Auteur ; Olga Ballùs, Auteur Année de publication : 2008 Article en page(s) : p. 40-42 Langues : Anglais (eng) Catégories : Colorimétrie Cuirs et peaux Retannage Tags : Peaux  'Agents  synthétiques  retannage'  Coloration  Interaction  'Test  colorimétrique'  'Etude  expérimentale'  Anionisation Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In practice, great difficulty exists is knowing where and how the synthetic retanning agents are distributed. In this second part the authors attempt to 'visualise', by means of special reagents, the penetration and distribution of the synthetic agents being tested. This process will lead to the 'anionisation' concept as a distribution factor for the synthetic retanning agents and their interaction with the dyestuff. En ligne : https://drive.google.com/file/d/1Evgh-c0LJXBzDyTDq3HY3DGpBKx_dcq2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9849 [article]

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