Carbon footprint and toxicity indicators of alternative chromium-free tanning in China / Xiaoying Xu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 5 (05/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 5 (05/2015) . - p. 130-137 Titre : Carbon footprint and toxicity indicators of alternative chromium-free tanning in China Type de document : texte imprimé Auteurs : Xiaoying Xu, Auteur ; Grau Baquero, Auteur ; Rita Puig, Auteur ; Jiabo Shi, Auteur ; Sang Jun, Auteur ; Wei Lin, Auteur Année de publication : 2015 Article en page(s) : p. 130-137 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bilan des émissions de gaz à effets de serre Durée de vie (Ingénierie) Énergie -- Consommation Environnement -- Etudes d'impact Tannage -- Aspect de l'environnement Toxicologie Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This paper analyzes, from a life cycle perspective, the environmental performance of a newly developed chromium-free tanning process compared to the conventional one, in China. Both processes were evaluated by using carbon footprint, energy consumption and toxicity indicators. Chromium-free tanning process has been found to significantly reduce the considered impact categories compared to conventional tanning. The impact contribution of each process step was calculated, with the tanning step being the major contributor. Results show that the production of chemicals used in the tanning process, have a significant effect on the impacts evaluated. Some of these chemicals have been substituted with similar ones (used as proxies) when no manufacturing-data was available in the databases. Thus, it is important for future and more precise LCA studies to develop databases on the specific chemicals used. This study is a first estimation of the impacts and will help on the decision of expending time and efforts on developing and optimizing the new technology. The results show that it is interesting to use this LCA methodology to environmentally evaluate new research processes and products, before industrial scaling and implementing them, to optimize research time and efforts towards the most environmentally promising products and processes. Note de contenu : - AIM OF THE STUDY - METHODOLOGY - INVENTORY DATA AND MODELING : Functional unit and system boundaries - Conventional tanning process model and inventory data - Chromium free tanning process model and inventory data - Chinese electrical power grid mix and thermal energy mix - Wastewater treatment - RESULTS AND DISCUSSION : Evaluation of the GWP index - Evaluation of the energy consumption - Evaluation of the toxicological impacts to humans and freshwater - Comparative evaluation of tanning steps En ligne : https://drive.google.com/file/d/10vyeauNiwsjpJ9kr5HmOz6pgSDeKiJ7c/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24053 [article]

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A novel approach for wet-white leather manufacture based on tannic acid-laponite nanoclay combination tannage / Jiabo Shi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 1 (01-02/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 1 (01-02/2016) . - p. 25-30 Titre : A novel approach for wet-white leather manufacture based on tannic acid-laponite nanoclay combination tannage Type de document : texte imprimé Auteurs : Jiabo Shi, Auteur ; Ren Keshuai, Auteur ; Wang Chunhua, Auteur ; Wang Jie, Auteur ; Lin Wei, Auteur Année de publication : 2016 Article en page(s) : p. 25-30 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Laponite Nanoparticules Tanins Tannage combiné Le tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en Å“uvre par exemple Chrome-Végétal ou Chrome-Synthétique Tannage minéral Tannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium Wet-white (tannage) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A novel wet-white tanning approach based on combination tanning with tannic acid (TA) and Laponite nanoclay has been proposed. Thermal stability measurements show that the introduction of Laponite nanoclay gives an obvious increase in the shrinkage temperature (Ta) cf TA-tanned leather, implying the presence of the synergistic effect between TA and Laponite nanoclay in the combination tanning process. The optimized tanning system, i.e. 20% TA combination tanned with 3% Laponite in one-bath for 3 hours al 25°C and final pH '-3.5, confers wet-white leathers with Ta above 89°C, and good storage stability. The introduction of Laponite nanoclay facilitates the fixation of TA in the wet-white leather. Scanning electron microscopie (SEM) results show that the combination tanned leathers exhibit fine isolated collagen fibre networks in cornparison with that of solo TA and solo Laponite tanned leather. The presence of Laponite nanoclay not only improves the mechanical strength of the resulting leather, but also gives an ultraviolet protection property. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Solo TA or laponite tanning process - TA-laponite combination tanning process - Determination of shrinkage temperature - Determination of the uptake of TA - Scanning electron microscopic analysis of crust leathers - Physical properties examination - Anti-UV property measurements - RESULTS AND DISCUSSION : Optimization of solo TA tannage - Optimization of TA-laponite nanoclay combination tannage - Scanning electron microscopic analysis of crust leathers - Physical strength properties of leathers - Anti-ultraviolet property of leathers En ligne : https://drive.google.com/file/d/16MrKQSI3ImRz-Y0Mh4TMm9XBm4IHqnyA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25558 [article]

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