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Preliminary studies on the thermal degradation kinetics of cattlehide collagen fibers / K. Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 10 (10/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 10 (10/2004) . - p. 401-408 Titre : Preliminary studies on the thermal degradation kinetics of cattlehide collagen fibers Type de document : texte imprimé Auteurs : K. Tang, Auteur ; Jinglong Liu, Auteur ; Jie Liu, Auteur ; F. Wang, Auteur Année de publication : 2004 Article en page(s) : p. 401-408 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper, samples of un-tanned cattlehide collagen fibers, chrome tanned cattlehide collagen fibers, and glutaraldehyde tanned cattlehide collagen fibers are prepared and preliminary studies of their thermal degradation behavior completed. The methods of both Flynn-Wall-Ozawa and SatavaÅ esták, which have been being widely and successfully used in the study of thermal degradation kinetics of synthetic polymers, are used to process the data obtained from thermo-gravimetric analysis of the three samples at different heating rates. The results obtained indicate that the thermal degradation activation energy of un-tanned cattlehide collagen fibers is 130-160 kJ/mol. After tanning with chrome, it can reach 225-255 kJ/mol. However, in the case of a sample tanned with glutaraldehyde, its thermal degradation activation energy is only 120-163 kJ/mol, very close to the value of un-tanned cattlehide collagen fibers. The results suggest that the crosslink bonds between collagen molecules formed in the chrome tanning process are much more stable at high temperature than those formed in the glutaraldehyde tanning process. En ligne : https://drive.google.com/file/d/1hJZlVrBVTouywbe7a81hwME6IyYjqi6C/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4222 [article]

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Factors influencing the waterproofing behaviour of retanning-fatliquoring polymers. Part I / Ramón Palop in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 10 (10/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 10 (10/2004) . - p. 409-415 Titre : Factors influencing the waterproofing behaviour of retanning-fatliquoring polymers. Part I Type de document : texte imprimé Auteurs : Ramón Palop, Auteur ; Agusti Marsal, Auteur Année de publication : 2004 Article en page(s) : p. 409-415 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the last decades several products have been applied to confer waterproofing properties to the leather: natural oils, alkenyl succinic acids, polysiloxanes, chromium soaps (stearates and oleates), phosphoric esters alone or in combination with alkenyl succinic acids and reactive agents or amphiphilic polymers. Other products (silicone derivative, fluorcarbonated resin) confer not only waterproofing but also oil repellent properties to the leather. In this work, the waterproofing behaviour of retanning-fatliquoring polymers alone or in combination with other hydrophobic products such as a silicone derivative and a fluorcarbonated resin is studied. The anionization of the tanned leather on the waterproofing performance of the retanning-fatliquoring polymer and the influence of the addition of fatliquoring auxiliaries to the tanning bath on the water repellent properties of the leather produced are also evaluated. A complete anionization of the tanned leather, by using a naphthalene sulphonic acid salt, is of paramount importance to obtain good water repellency. The addition of a sulphochlorinated paraffin and a phosphoric ester to the tanning bath reduced water-repellency values drastically. En ligne : https://drive.google.com/file/d/1-KmfFrI17zAh_8_d07sy0I2hPH8eCpTE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4223 [article]

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Emission from automotive leather - state of the art and a critical foresight / Michael Breitsamer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 10 (10/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 10 (10/2004) . - p. 416-423 Titre : Emission from automotive leather - state of the art and a critical foresight Type de document : texte imprimé Auteurs : Michael Breitsamer, Auteur ; Ottmar Gotz, Auteur Année de publication : 2004 Article en page(s) : p. 416-423 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the last decades several products have been applied to confer waterproofing properties to the leather: natural oils, alkenyl succinic acids, polysiloxanes, chromium soaps (stearates and oleates), phosphoric esters alone or in combination with alkenyl succinic acids and reactive agents or amphiphilic polymers. Other products (silicone derivative, fluorcarbonated resin) confer not only waterproofing but also oil repellent properties to the leather. In this work, the waterproofing behaviour of retanning-fatliquoring polymers alone or in combination with other hydrophobic products such as a silicone derivative and a fluorcarbonated resin is studied. The anionization of the tanned leather on the waterproofing performance of the retanning-fatliquoring polymer and the influence of the addition of fatliquoring auxiliaries to the tanning bath on the water repellent properties of the leather produced are also evaluated. A complete anionization of the tanned leather, by using a naphthalene sulphonic acid salt, is of paramount importance to obtain good water repellency. The addition of a sulphochlorinated paraffin and a phosphoric ester to the tanning bath reduced water-repellency values drastically. En ligne : https://drive.google.com/file/d/1eDKauA2o2eHY8lE_UN72ci7uhsGglpMH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4224 [article]

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Sustainable leather manufacturing - a topic with growing importance / S. Huffer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 10 (10/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 10 (10/2004) . - p. 424-428 Titre : Sustainable leather manufacturing - a topic with growing importance Type de document : texte imprimé Auteurs : S. Huffer, Auteur ; Tilman Taeger, Auteur Année de publication : 2004 Article en page(s) : p. 424-428 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The idea of "sustainability" has become one of the major topics in industry and politics and probably represents one of the mega-trends of the early 21st Century. Due to outdated processes and methods applied in the leather industry, the waste products and the significant amounts of process water used oppose more and more legislation and the concept of sustainability. Examples are very well known, e.g. organic sludges with sulfides, chrome, salts, residues of surfactants like Nonylphenolethoxylates (NPE), poor biodegradable tannins and fats - the list is long and we are aware that these problems can only be tackled stepwise. Last year we reported about a more "sustainable" surfactant' for the substitution of NPE's. Today we want to discuss a whole new concept, which especially addresses new legislation in Europe. It states that by the middle of 2005 chrome shavings and other organic wastes can no longer be dumped in landfill-sites. En ligne : https://drive.google.com/file/d/1-Zf57FOuZM22_vdra0Nqpo9yh9WinIw1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4225 [article]

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