Modification of larch extract by intensive sulfitation and applications of the product in combination tannages / Bi Shi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 1 (01/2002)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 1 (01/2002) . - p. 1-7 Titre : Modification of larch extract by intensive sulfitation and applications of the product in combination tannages Type de document : texte imprimé Auteurs : Bi Shi, Auteur ; Guangwei Du, Auteur ; L. Song, Auteur ; Ying Di, Auteur Année de publication : 2002 Article en page(s) : p. 1-7 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Larch bark extract, the condensed tannin with procyanidin structure, was modified by intensive sulfitation using 20% Na2SO3. This unusual treatment brought about degradation of tannin molecules and increased hydrophilicity of the product, whilst the synergistic effect of the modified product with Cr(III) was enhanced. As a result, 5-10% tannin compound was able to penetrate through pickled pelt in 1-2h without pre-treatment, and in conjunction with 1.0% Cr2O3, could produced leathers with shrinkage temperature above 110°C. Physical properties of the leathers were more comparable to common chrome leathers. The so-called vegetable tanned character was largely eliminated by such a small offer of vegetable compounds. The conditions of the chemical modification and the applications of the product are described in detail. En ligne : https://drive.google.com/file/d/1lciFN1_5mAkS22H_4dklRMYCtlnDsW0q/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4341 [article]

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