Balancing of properties of veg tan/muf leathers by mixed chestnut/condensed tannins / C. Simon in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 5 (05/2003)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 5 (05/2003) . - p. 193-195 Titre : Balancing of properties of veg tan/muf leathers by mixed chestnut/condensed tannins Type de document : texte imprimé Auteurs : C. Simon, Auteur ; Antonio Pizzi, Auteur ; B. George, Auteur ; M.-L. Antoine, Auteur Année de publication : 2003 Article en page(s) : p. 193-195 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Recently a process based on the tanning of leather based on the coreaction in situ of vegetable tannins with a new-concept MUF resin during hide treatment yielded leather that had antishrinkage characteristics as good as those obtained by chrome tanning.1-4 Both hydrolysable and condensed tannins were proved to be suitable. This treatment also yielded leather that presented good light- and colour-fastness to UV and visible light irradiation.1-4The combination with aminoplastic MUF resins appears to markedly reduce the photooxydation of vegetable tannins by synergy with the synthetic resin, while still yielding a relatively soft but also tough leather without the need for chrome salts. Leathers prepared with Chestnut or Mimosa combined with MUF tannage in 50/50 and in 75/25 weight ratios exhibited the most promising physical properties. In general polyflavonoid tannins/MUF treatments performed better as regards leather shrinkage temperature than the hydrolysable chestnut tannin/MUF, with mimosa presenting in general a slightly higher shrinkage temperature than quebracho. Conversely, a chestnut/MUF treatment gives by far better colour fastness results and better light stability than all the flavonoid tannins at all levels of MUF addition. The present study reports the results obtained by trying to balance these two properties, namely light/colour fastness and shrinkage temperature. Hybrid chestnut/mimosa mixtures in combination with the MUF resin yield the wanted balance of properties. En ligne : https://drive.google.com/file/d/1Rbnj-9lhfF4LSQ_wMHdXtJYM-8Qufv3K/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4122 [article]

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Leather light stability/tannins antioxidant characteristics for leather made with vegetable tannins/MUF resins / B. George in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 1 (01/2004)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 1 (01/2004) . - p. 1-11 Titre : Leather light stability/tannins antioxidant characteristics for leather made with vegetable tannins/MUF resins Type de document : texte imprimé Auteurs : B. George, Auteur ; C. Triboulot, Auteur ; C. Simon, Auteur ; Antonio Pizzi, Auteur Année de publication : 2004 Article en page(s) : p. 1-11 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A new sulphonated melamine-urea-formaldehyde (MUF) polycondensation resin of relatively low melamine content, prepared according to a sequential formulation, has been shown to be highly effective when coupled with different natural vegetable tannins to produce leather with the same good characteristics of leather prepared with chrome salts. The variation of leather colour as a function of ageing time on prolonged irradiation with UV light of the leather produced with different combinations of veg tannins/MUF resins has been reported. A predictive model and equation for the variation of leather colour as a function of ageing time has also been established and is presented. The variation of leather colour as a function of ageing time has been correlated with both the antioxidant capability of pure tannins in solid form, and with their antioxidant capability in situ within the leather prepared with them. En ligne : https://drive.google.com/file/d/1qAUths_-DVXLk0Qcix-oEjeiMYOXVrYg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4171 [article]

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