Exploration of the diffusion, binding and crosslinking of chromium complex within hides during chrome tanning / Chunxiao Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 5 (05/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 5 (05/2019) . - p. 180-188 Titre : Exploration of the diffusion, binding and crosslinking of chromium complex within hides during chrome tanning Type de document : texte imprimé Auteurs : Chunxiao Zhang, Auteur ; Jieming Hu, Auteur ; Desheng Yu, Auteur ; Cong Xia, Auteur ; Sadaqat Ali Chattha, Auteur ; Biyu Peng, Auteur Année de publication : 2019 Article en page(s) : p. 180-188 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acides carboxyliques Cuirs et peaux -- Analyse Diffusion (physique) Eaux usées -- Analyse Formiate de sodium Formique, Acide Liaisons chimiques pH Picklage Le picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu. Sulfurique, Acide Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Understanding the persuasive mechanisms of the accessibility and interactions of chromium complex with collagen is an important fundamental issue for maximizing the utilization of chromium during the transformation of collagen to leather by chrome tanning technology. This study details these mechanisms through process monitoring of the effects of technical conditions of chromium diffusion and its binding with the collagen matrix. The results indicated that there was no discernible impact of carboxylic masking agents on both diffusion and binding behavior of chromium complexes at low pH before basification, but it portentously declined the total chromium absorption at the end of chrome tanning. The results made known that in the course of chrome tanning, the higher pH conditions encouraged the diffusion and binding behavior of chromium complexes with collagen matrix not only before but after the basification as well. Chrome tanning at high pH did not cause excessive surface tanning effects of the leather, but the WAXD study indicated that there was much more crosslinking (both intra and inter triple helix) of collagen fibers in the inner layers of leather matrix, which had a robust impact on the fullness, tightness and stiffness of the finished leather. These findings could provide more theoretical foundations for the development of high exhaustion chrome tanning technology as a method for reduced chromium emission and improved the quality of leather during leather manufacture. Note de contenu : - EXPERIMENTAL : Materials and instruments - Pickling and chrome tanning with carboxylic acid and sulfuric acid - Pickling and chrome tanning with different formic acid dosages - Chrome tanning with different sodium formate dosages - Chrome tanning at varying initial pH with sulfuric acid pickling - Determination of chromium concentration in spent tanning liquors - Determination of chromium content in leather - Scanning Electron Microscopy (SEM) analysis - Scanning Electron Microscope-X-ray energy dispersive spectroscopy (SEM-EDS) analysis - Wide-angle X-ray diffraction (WAXD) studies - RESULTS AND DISCUSSIONS : Influence of the molecular structure of carboxyl acid on chrome tanning - Effects of the dosages of carboxyl groupe on chrome tanning - Influence of pickling pH on chrome tanning En ligne : https://drive.google.com/file/d/1ZX8MWYG68fy_UO8IzDkwdpnHPv1SQBjW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32478 [article]

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