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Cleantan - Chromium tanning without chromium and water residues / Manfred Renner in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 8 (08/2013)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 8 (08/2013) . - p. 289-293 Titre : Cleantan - Chromium tanning without chromium and water residues Type de document : texte imprimé Auteurs : Manfred Renner, Auteur ; B. Weidner, Auteur ; H. Geihsler, Auteur Année de publication : 2013 Article en page(s) : p. 289-293 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Déchets -- Réduction Dioxyde de carbone Eau -- Consommation -- Réduction Eaux usées -- Recyclage Pollution -- Lutte contre Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Fraunhofer UMSICHT has developed a new chromium tanning process principle to reduce the chromium contaminated sewage water, to save tanning agents and to reduce the process time. The first part of the lecture, given by Manfred Renner, head of business unit, will give a survey of the new tanning principle. The compressed natural gas carbon dioxide is used instead of water for the pickling and the tanning process. The use of different pressure ranges gives the possibility to control the pH value without using chemicals. A free from water and free from salt pickle is possible. The use of chromium can be controlled precisely and it is possible to use only as much chromium as can be fixed in the collagenic matrix. The lecture will show results achieved with technical- and preindustrial scale (650 kg split weight per batch) high-pressure equipment. Using carbon dioxide 14 million liters of chromium contaminated sewage water in the tanning process, 20 billion liters of sewage water to produce the tanning agents, 160 000 tons of chromium and 500 000 tons of salt could be saved regarding the worldwide market. The second part of the lecture, given by Prof. Dr. Weidner, head of the Fraunhofer Institute UMSICHT, will focus on the strategy of how to enter the market. For the prospective customers it will give the opportunity to see if the technology fits their companies and their main OEM customers. It will also be shown how easy the new equipment can be implemented in a running tannery. Note de contenu : - INTRODUCTION : CO2-intensified tanning process - MATERIAL AND METHODS : Tanning solutions - Skin - Quality assessment - 20 L high pressure tanning bin - 1,700 L high pressure tanning bin - RESULTS : Chromium tanning under CO2-pressure as function of pressure and contact time - Tanning free of chromium contaminated wastewater - Influence of pressure using a minimum of chemicals for different parts of skin En ligne : https://drive.google.com/file/d/1-d17RlqCNh6WqXqNgZZ1rOpGjzkazSDQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19177 [article]

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Effect of retanning agents on dry heat resistance of leathers / Chao Wu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 8 (08/2013)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 8 (08/2013) . - p. 294-299 Titre : Effect of retanning agents on dry heat resistance of leathers Type de document : texte imprimé Auteurs : Chao Wu, Auteur ; Yunhang Zeng, Auteur ; Xuepin Liao, Auteur ; Wenhua Zhang, Auteur ; Bi Shi, Auteur Année de publication : 2013 Article en page(s) : p. 294-299 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage Chaleur sèche Cuirs et peaux Résistance thermique Retannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : To obtain acceptable dry heat resistance of leather by using proper retanning agents, the effect of typical retanning agents on dry heat resistance was investigated. The results indicated that the leathers retanned by different retanning agents have varying dry heat resistance, and the dry heat resistance is not always positively correlated with hydrothermal stability. Heating leather at 150oC for 30 min in the dry state led to minor damage to the crosslinking of collagen fibers, such as destruction of hydrogen bonds or other weak crosslinks. The increase of water content in leather exhibits negative effect on the dry heat resistance. Therefore, it was observed that the retanning agent that has lower hydrophility lead to higher dry heat resistance of leather. In addition, it seems that the retanning agents with good filling property and thermal stability are effective in achieving high dry heat resistance of leather. Note de contenu : - EXPERIMENTAL : Materials - Retanning bu using different retanning agents - Characterization of leathers (analysis of dry heat resistance - Analysis of hydrothermal stability - Analysis of water content in leather - Analyses of FTIR - Thermogravimetric (TG) analysis) - Characterization of retanning - RESULTS AND DISCUSSION : Thermal stability of different retanned leathers - Analysis of leathers by FTIR spectroscopy - Effect of water content on dry heat resistance of leather - TG analysis En ligne : https://drive.google.com/file/d/1Ib8rQhCVbFwOrrdREO48SclCNjVOTwnR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19178 [article]

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Optimization of keratinolytic protease production by purpureocillium lilacinum LPS # 876 as a sustainable management of tannery hair waste / Ivana Alejandra Cavello in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 8 (08/2013)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 8 (08/2013) . - p. 300-310 Titre : Optimization of keratinolytic protease production by purpureocillium lilacinum LPS # 876 as a sustainable management of tannery hair waste Type de document : texte imprimé Auteurs : Ivana Alejandra Cavello, Auteur ; Sebastiàn Fernando Cavalitto, Auteur Année de publication : 2013 Article en page(s) : p. 300-310 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biodégradation Cuirs et peaux -- Déchets -- Recyclage Déchets organiques -- Recyclage Kératinases Poils -- Recyclage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Hair waste is recognized as a solid waste generated after a hair-saving unhairing process in leather technology, and it is produced in large amounts in Buenos Aires province, Argentine. The present method for this solid waste is disposal, which is environmentally troublesome and costly for the tanneries. Biodegradation of hair waste by keratinolytic microorganisms represents an alternative for bioconversion of keratin waste. This paper reports the optimization of keratinases production by Purpureocillium lilacinum LPS # 876. Firstly, one factor-at-a-time method was used to investigate the effect of nitrogen-sources, metal ions concentration in the basal mineral medium, as well as, initial pH and temperature on enzyme production. Medium composition for the keratinases production by P. lilacinum was optimized using two statistical methods: Plackett-Burman design and central composite design -combined with response surface methodology- used to optimize three significant variables: initial pH, glucose and CaCl2. The optimal conditions were determined as 7.10 g l-1 of glucose; 0.0065 mg l-1 of CaCl2 and initial pH of 5.60; at this condition the maximum keratinase yield predicted was 26.7 U ml-1. The model validation showed that it described adequately the influence of glucose and calcium concentration and initial pH on enzyme production. Production of keratinases by P. lilacinum is a less-exploited field that might represent a novel and promising biotechnological application for this microorganism. Note de contenu : - MATERIALS AND METHODS : Reagents - Microorganism and culture conditions - Determination of proteolytic activity - OPTIMIZATION OF FERMENTATION MEDIUM USING ONE-VARIABLE-AT-A-TIME METHOD : Effect of environmental conditions on production keratinases - Effect of the concentration of the metal ions present in the basal mineral medium - Effect of the addition of some salts on keratinolytic enzymes production - Effect of nitrogen sources - Identification of the significant factors by Plackett-Burman (PB) design - Central Composite Design and Response Surface Methodology - BIOCHEMICAL PROPERTIES OF CRUD ENZYME : Detection of keratinolytic activity on polyacrylamide gels (casein and keratin-zymograms) - Substrate specificity - RESULTS : Optimization using one-variable-at-a-time approach - Selection of significant variables by Plackett-Burman design - Optimization by response surface methodology (RSM) - Detection of keratinolytic activity on polyacrylamide gels (casein and keratin-zymograms) - Substrate specificity En ligne : https://drive.google.com/file/d/1UOY6o8dh6sX7U4bHC-G1WlIdxLmn3DgC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19179 [article]

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High performance acrylic polymer technology for use in leather finishing processes / J. Hoefler in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 8 (08/2013)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 8 (08/2013) . - p. 311-317 Titre : High performance acrylic polymer technology for use in leather finishing processes Type de document : texte imprimé Auteurs : J. Hoefler, Auteur ; B. Hageman, Auteur ; C. J. Chung, Auteur ; R. Smith, Auteur Année de publication : 2013 Article en page(s) : p. 311-317 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir d'ameublement Cuir dans les automobiles Cuirs et peaux -- Finition Cuirs et peaux -- Propriétés mécaniques Frottements (mécanique) Liants Polyacryliques Résistance à la salissure Sellerie Usure (mécanique) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : High performance topcoats designed for automotive and furniture upholstery are generally rich in polyurethane dispersion (PUD)-based binders. This binder technology has been used commercially for years because it offers a distinct combination of high abrasion resistance, flexibility, and tactile performance benefits. However, recent market trends place higher emphasis on performance properties that are challenging for these traditional finishing systems to achieve. Such properties include: dirt pick-up and dye transfer resistance, cleanability after soiling, as well as UV, hydrolytic, and thermal stability. Topcoats featuring acrylic-based binders are increasingly competitive due to intrinsic soiling resistance and stability properties; however, replacing more than approximately 25% of the polyurethane-based resin with acrylic-based resin can result in a noticeable loss in abrasion resistance or toughness. The Dow Chemical Company has developed a novel acrylic binder technology designed to offer many of the same advantages of PUD binders, such as toughness, while retaining the enhanced soiling resistance and stability needed to address the stringent demands of today’s market. This paper describes the performance properties attributed to this new binder technology through a systematic validation process. Note de contenu : - EXPERIMENTAL : Performance topcoat - Anti-soiling topcoat - Summary of the new acrylic technology for the performance topcoat - MATERIALS AND METHODS : Finish and formulations - Process sequence - Tack - Gloss - Bally flexibility - Rub fastness - Wear support - Flexibility - Anti-soiling - Color En ligne : https://drive.google.com/file/d/1H3KmRI16eiDGiqluClAnYvY2vIScr2Dp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19180 [article]

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