Controlling Cr(VI) in leather : A review from passive prevention to stabilization of chromium complexes / Chen Jing in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 7 (07/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 7 (07/2017) . - p. 250-257 Titre : Controlling Cr(VI) in leather : A review from passive prevention to stabilization of chromium complexes Type de document : texte imprimé Auteurs : Chen Jing, Auteur ; Zhou Nan, Auteur ; Wuyong Chen, Auteur ; Sun Shiyu, Auteur Année de publication : 2017 Article en page(s) : p. 250-257 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir -- Teneur en chrome hexavalent Cuir -- Teneur en chrome trivalent Stabilisants (chimie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The Cr(VI) content in leather has garnered much attention in today's world of increasingly stringent environmental and safety regulations. In addition, the European Union (EU) countries have zero tolerance policies. For chromium-tanned leather, there is a risk of converting trivalent chromium into the hexavalent form in the processes of production, storage, transportation and usage. In this article, the routes for the occurrence of Cr(VI) are briefly analyzed, and the various types of Cr(VI) control technologies in leather manufacturing processes are reviewed. One control technology is passive PREVENTION, which could inhibit the hexavalent chromium to some extent through the addition of antioxidants and reducing agents, but it might not fundamentally solve the hexavalent problem. In contrast, CONSOLIDATION technologies to improve the stabilization of chromium complexes could play critical and responsible roles to effectively prevent the emergence of hexavalent chromium in leather. Several proposals are addressed for the control of Cr(VI) in leather, and CONSOLIDATION technology is determined to be more important than PREVENTION technology. In addition, a new viewpoint is presented to completely solve the problem based on the stability of Cr3+ complexes. Taking the amount of Cr(VI) as a quantitative indicator, the mechanisms and key technologies for the effect of specific coordinating compounds (ligands) on the stability of Cr3+ to prevent Cr(VI) formation would be recommended for further study toward. Note de contenu : - PASSIVE PREVENTION OF CR(VI) : Sulfur compounds and small molecule phenols - Vegetal tanning extracts - Other natural polymers - STABILIZATION OF CHROMIUM COMPLEXES : Small molecule compounds - High-molecular-weight polymers - Others En ligne : https://drive.google.com/file/d/1mYL7N8y2yVBPby2QOd5E34CzIFGOwrbS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28823 [article]

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Microbial transglutaminase as pre-tanning agents in the leather industry / Baozhen Cheng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 4 (04/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 4 (04/2015) . - p. 103-108 Titre : Microbial transglutaminase as pre-tanning agents in the leather industry Type de document : texte imprimé Auteurs : Baozhen Cheng, Auteur ; Chen Jing, Auteur Année de publication : 2015 Article en page(s) : p. 103-108 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux Prétannage Température de retrait Transglutaminase Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Microbial transglutaminases(MTG) was used to pre-tan hide to investigate its effect on the hydrothermal stability of hide and the improvement for exhaustion of chrome tanning agent. This study tested the shrinkage temperatures of samples treated with MTG only and tanned MTG followed by the chrome tanning agent separately. The Cr2O3 content in effluents was surveyed after chrome tanning. It was shown that the shrinkage temperature of hide sample treated with 0.6% MTG at pH 6.0 for 2h was above 80°C, much higher than 54.8°C, which is the Ts of control. While the Ts of leather sample, which was pre-treated with 0.6% of MTG first, tanned with only 4% chrome tanning agent were higher than 100°C, but initial pH is 2.0. Moreover, the exhaustion of chrome tanning agent in leather was improved significantly when the dosage of chrome salt was less than 4%. Note de contenu : - The amount of MTG and pre-tanning time - The amount of chrome tanning agent - Table 1 : Processing of hides pre-treated with MTG - Table 2 : Processing of hides pre-treated with MTG and tanned with chrome-tanning agent at different pH - Table 3 : Processing of hides tanned with different amount of MTG and chrome-tanning agent En ligne : https://drive.google.com/file/d/1z6HrQzDNv2lA43U_W3xEY-UHnboZM85b/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23808 [article]

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The influence of research of leather's ecological properties on its products - Eco-design / Chen Jing in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 6 (11-12/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 6 (11-12/2014) . - p. 275-284 Titre : The influence of research of leather's ecological properties on its products - Eco-design Type de document : texte imprimé Auteurs : Chen Jing, Auteur ; Baozhen Cheng, Auteur ; Sun Shiyu, Auteur ; Zhang Xiaolei, Auteur Année de publication : 2014 Article en page(s) : p. 275-284 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bilan des émissions de gaz à effets de serre Cuir Cuirs et peaux -- Aspect de l'environnement Durée de vie (Ingénierie) Eco-conception Environnement -- Etudes d'impact Evaluation du risque Maroquinerie Produits commerciaux -- Cycle de vie Sacs à main Substances dangereuses -- Evaluation du risque Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Ecodesign for leather products implies that the different potentiel environmental impacts of the main material, leather and finished products must be taken into account considering its whole life cycle, apart from the general design criteria (i.e. technical, functional, aesthetic or economic). In this paper, a bag made of leather was taken as a case study. A sustainability assessment methodology, given the major concern on carbon footprint (CF) and environmental risk assessment (ERA), were combined to derive complementaty criteria for the ecodesign of leather products, thus the effect of ecological properties of leather on finished products were analyzed. It was concluded that the key to leather product ecodesign is to choose leather. Leather's ecological properties directly determine their values of carbon footprint and environmental risk assessment. It was shown that, the process, clean-energy usage and the waste disposal have impacts on carbon footprint. Different countries and processes resulted in great gaps in leather's carbon footprint. Banned azo colorants have the most carcinogenic risk amongst the hazardous compounds used in the leather industry. Thus, the leather is crucial in the process of ecodesign for leather products, the ecological criteria and supplier selection are rigorous. On the premise of aesthetic design, the perspective provided by the indicators of different nature was balanced to accomplish a fair evaluation. The selection of leather produced under sustainable criteria and the reduction of the materials consumption was recommended, since the area requirements would be minimized and the absence of hazardous compounds would ensure safety conditions during the use stage. Note de contenu : - MATERIALS AND METHODS : Case study - Carbon footprint - Environmental risk assessment - RESULTS AND DISCUSSION : Inventory data - CF results - ERA - Analysis of ecodesign criteria En ligne : https://drive.google.com/file/d/17H7alEoDS0ZgV9LnNZAoAuSdBcFSJfs_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22650 [article]

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