A cleaner chrome-free tanning regime : sulfonated urea-phenol-formaldehyde condensed polymer and ferrous sulfate tanning / Chen Hui in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 1 (01/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 1 (01/2011) . - p. 18-24 Titre : A cleaner chrome-free tanning regime : sulfonated urea-phenol-formaldehyde condensed polymer and ferrous sulfate tanning Type de document : texte imprimé Auteurs : Chen Hui, Auteur ; Guo Jun, Auteur ; Shan Zhi-Hua, Auteur Année de publication : 2011 Article en page(s) : p. 18-24 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux Cuirs et peaux -- Propriétés mécaniques Formaldéhyde Phénol Polymères Résistance des matériaux Sulfate de fer Tannage Urée Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The potential of iron as a tanning agent has been known for a long time, but commercial exploitation has been limited because of concerns over loss of strength and darkening of color with time. To overcome these drawbacks, a combination tannage using ferrous sulfate and phenol-condensed polymers is proposed. Trials indicate that a combination tannage using sulfonated urea-phenol-aldehyde-condensed polymer (Sul.) after ferrous sulfate (Fe(II)) treatment produces favorable results. Shrinkage temperatures of up to 90°C were observed, with tensile strength of 238.3 kg/cm2, tear strength of 73.3 kg/cm, and elongation at break of 62.1%. The Sul.-Fe(II) tanned leather was lighter in color compared to iron tanned leather, and neither a darkening of color or a reduction in strength upon ageing was observed. The combination tanning system also has demonstrable environmental benefits compared to basic chromium sulfate (BCS)-Fe(II) tanning systems. The Sul.-Fe(II) combined system helps to reduce chemical oxygen demand (COD), and total solids (TS) content. Through experiments it is evident that COD, TS loads are reduced by 37.59% and 36.35%, respectively for Fe(II)-Sul. method compared to Fe(II) method. So the developed Fe(II)-Sul. regime not only has advantages in reducing pollution loads but also seems to be techno-economically viable. En ligne : https://drive.google.com/file/d/1cy6pQrEl0xgcfOA3sPjck6v23csmx4bN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10520 [article]

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Research on the composite and functional characteristics of leather fiber mixed with nitrile rubber / Guo Jun in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 12 p. Titre : Research on the composite and functional characteristics of leather fiber mixed with nitrile rubber Type de document : texte imprimé Auteurs : Guo Jun, Auteur ; Rui Dai, Auteur ; Hui Chen, Auteur ; Yan Liang, Auteur ; Zhihua Shan, Auteur Année de publication : 2021 Article en page(s) : 12 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caoutchouc nitrile-butadiène Composites -- Propriétés mécaniques Composites -- Propriétés thermiques Cuir -- teneur en chrome Cuirs et peaux -- Déchets -- Recyclage Lixiviation Mélange Résistance au vieillissement Vulcanisation Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The recycling of leather solid waste not only involves resource utilization and environmental protection but also has important significance for the sustainable development of the leather industry. In this paper, the leather waste was crushed into fibers, which were stabilized and mixed with nitrile-butadiene rubber (NBR). The mixture was milled and vulcanized and a composite NBR-SLF (Stabilized Leather Fiber) is prepared for sealing material. The physical and mechanical properties, water resistance, oil resistance and aging resistance of NBR-SLF were tested and analyzed. It is found that the optimized NBR-SLF not only reduces the cost of raw material, but also changes the physical and mechanical performance of NBR. As a sealing material, it satisfies the substitution of NBR in terms of hardness and thermal stability. Especially the anti-aging ability is better than NBR. Note de contenu : - EXPERIMENTAL : Main materials - Crushing of LW - Stabilization treatment of LF - Cr leaching of SLF - Preparation of NBR-SLF composite - Morphologies observations of NBR-SLF - Mechanical performance test of NBR-SLF - Thermal performance of NBR-SLF - Vulcanization characteristics of NBR-SLF - Resistance of NBR-SLF to media - Resistance of NBR-SLF to aging - RESULTS AND DISCUSSION : Cr leaching of SLF - Optimization of mechanical performance and conditions of NBR-SLF - Thermal performance of NBR-SLF - Vulcanization characteristics of NBR-SLF - Resistance of NBR-SLF to media - Resistance of NBR-SLF to aging - Table 1 : NBR-SLF composite recipe - Table 2 : Cr (VI) and total Cr content measured by two leaching methods - Table 3 : Effect of SLF amount on curing NBR-SLF - Table 4 : Experimental physical parameters of NBR-SLF DOI : https://doi.org/10.1186/s42825-020-00052-5 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00052-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37475 [article]

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