Effect of pickling materials on leather quality from a hide surface charge perspective / Tianqi Yang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 7 (07/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 7 (07/2022) . - p. 279-287 Titre : Effect of pickling materials on leather quality from a hide surface charge perspective Type de document : texte imprimé Auteurs : Tianqi Yang, Auteur ; Yunhang Zeng, Auteur ; Qingyong Sun, Auteur ; Chao Lei, Auteur ; Bi Shi, Auteur Année de publication : 2022 Article en page(s) : p. 279-287 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composés aromatiques Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Propriétés physiques Pénétration cutanée 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. Sulfoniques, Acides Tannage au chrome Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Salt-free pickling technology has recently received increased attention because it produces much lower salt pollution than the conventional pickling technology using formic acid, sulfuric acid, and sodium chloride. However, the existing salt-free pickling materials, for instance, aromatic sulfonic acids (ASAs), lead to reduced leather quality and the reason behind this phenomenon is unclear. In this study, we explored how ASAs affect the properties of tanned leather. Results showed that typical ASAs, such as 5-sulfosalicylic acid, 1,5-naphthalenedisulfonic acid, and 2-naphthalenesulfonic acid, penetrated cattle hide more slowly compared with formic and sulfuric acids because of their large molecular weight and strong intermolecular interactions with hide collagen. ASAs decreased the positive charge of the pickled hide via interactions with their sulfonic acid groups, resulting in the increased adsorption rate of chrome tanning agent to the hide surface. Rapid tanning agent adsorption could impede the deep penetration and uniform distribution of the agent in the ASA-pickled hide. Thus, the properties of wet blues and crust leathers pickled with ASAs are inferior to those of wet blue and crust leather pickled using conventional pickling materials. Our results indicate that a strongly positive charge of the pickled hide is vital to obtaining high-quality leather and provide insights into salt-free pickling materials from a hide surface charge perspective. Note de contenu : - EXPERIMENTAL : Materials - Pickling experiments - Analyses of pickling performance - Analyses of chrome tanning performance - Determination of the physical properties of crust leather - RESULTS AND DISCUSSION : Penetration of various acids into hide - Surface charge properties of hides pickled with various acids - Hydrothermal stability and fiber dispersion of hides pickled with various acids - Effect of pickling materials on chrome tanning performance - Effect of pickling materials on the physical properties of crust leathers - Table 1 : Pickling and chrome tanning processes - Table 2 : Pseudo-first-order and pseudo-second-order kinetic parameters for chrome adsorption - Table 3 : Physical properties of crust leathers DOI : https://doi.org/10.34314/jalca.v117i7.5962 En ligne : https://drive.google.com/file/d/1UhajIthtPvDv2bquUbfxlI9pj2WugNC8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37820 [article]

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