Synthetic organic tannage based on melamine resin and THPS : Development of semi-industrial scale process for high-quality bovine upper leather / A. d'aquino in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 5 (09-10/2003)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 87, N° 5 (09-10/2003) Titre : Synthetic organic tannage based on melamine resin and THPS : Development of semi-industrial scale process for high-quality bovine upper leather Type de document : texte imprimé Auteurs : A. d'aquino, Auteur ; G. d'Elia, Auteur ; B. Naviglio, Auteur ; M. Seggiani, Auteur ; M. Tomaselli, Auteur ; Sandra Vitolo, Auteur Année de publication : 2003 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux de bovins Mélamine La mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6. Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde. Réticulants Sulfate de tétrakis hydroxyméthyl phosphonium Le sulfate de tétrakis hydroxyméthyl phosphonium est un myxobactéricide qui offre une prévention efficace contre les biofilms microbiens dans les eaux de traitement, et ce, pour une vaste gamme de micro-organismes formant des biofilms. Le sulfate de tétrakis (hydroxyméthyl) phosphonium agit principalement en augmentant la perméabilité de la membrane externe de l'enveloppe de la cellule microbienne, ce qui entraîne la libération rapide de protéines et d'autres substances cellulaires par les cellules. En outre, le sulfate de tétrakis (hydroxyméthyl) phosphonium inhibe le processus de sulfatoréduction dans les bactéries réductrices de sulfate. Tannage synthétique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this study, an industrial-scale tanning process intended to replace chrome tanning in the production of high quality bovine shoe upper leathers, has been realized by a one-step synthetic tannage based on a melamine resin and THPS as cross-linking agent. This paper reports the best recipe developed, the properties of the leather obtained and scanning electron microscopy examination used as investigational methods to follow the tanning process and to better understand the cross-linking mechanisms. The leather obtained is characterized by good hydrothermal stability, coupled with good physical and technical properties which allow it to meet the standards required for high quality chromium-tanned bovine upper leather. The results obtained suggest that this tannage is a promising alternative to traditional chrome tanning. Note de contenu : - Melamine resin tannage - Melamine resin polymerization by THPS cross-linking : blank tests - Melamine resin - THPS tannage on laboratory scale - a) Two-step tannage at room temperature with final heating to 50°C - b) One-step tanning by simultaneous addition of melamine resin and THPS at room temperature and final heating to 50°C - Melamine resin - THPS tannage on pilot-scale - Table 1 : Fatliquoring/dyeing process (offers: wt.% based on tanned weight) - Table 2 : Blank tests of Granofin DP polymerisation in water - Table 3 : Two-step THPS-melamine resin tanning process for bovine shoe upper leather (offers: wt.% based on pickled or bated weight) - Table 4 : One-step THPS-melamine resin tanning process for bovine shoe upper leather (offers: wt.% based on pickled weight) - Table 5 : Physical tests results of THPS-melamine resin tanned shoe upper leather En ligne : https://drive.google.com/file/d/1o6KfmxYsBOjSdgkqe9pv1f9Zri4w0_rv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39744 [article]

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Tara-aluminum tanning as an alternative to traditional chrome tanning : Development of a pilot-scale process for high-quality bovine upper leather / Sandra Vitolo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 4 (04/2003)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 4 (04/2003) . - p. 123-131 Titre : Tara-aluminum tanning as an alternative to traditional chrome tanning : Development of a pilot-scale process for high-quality bovine upper leather Type de document : texte imprimé Auteurs : Sandra Vitolo, Auteur ; M. Tomaselli, Auteur ; Biagio Naviglio, Auteur ; N. Barbani, Auteur ; Maurizia Seggiani, Auteur Année de publication : 2003 Article en page(s) : p. 123-131 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this study, an industrial-scale tanning process to replace chrome tanning in the production of high quality bovine shoe upper leathers, based on a multi-step vegetable-aluminum tannage, is presented. Tara extract was used as vegetable tanning agent in order to obtain a wet-white tanned leather; a pretannage with glutaraldeyde or syntan was introduced to improve penetration. This paper reports the best recipes developed, the properties of the leather obtained and the results of differential scanning calorimetry (DSC), thermogravimetric analysis (TG and DTG), and scanning electron microscopy (SEM) used as investigation methods to follow the tanning process steps and better understand the cross-linking mechanisms. En ligne : https://drive.google.com/file/d/16YNiwkXMBbwPpXr3vuYQySi2R2QSTHt1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4114 [article]

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Use of sodium silicate to improve the environmental aspects of traditional chrome tanning : development of a semi-industrial scaled process for high-quality bovine upper leather / A. d'aquino 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. 26-36 Titre : Use of sodium silicate to improve the environmental aspects of traditional chrome tanning : development of a semi-industrial scaled process for high-quality bovine upper leather Type de document : texte imprimé Auteurs : A. d'aquino, Auteur ; G. d'Elia, Auteur ; Maurizia Seggiani, Auteur ; Sandra Vitolo, Auteur ; Biagio Naviglio, Auteur ; M. Tomaselli, Auteur Année de publication : 2004 Article en page(s) : p. 26-36 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : As an alternative to the traditional process, a tanning process for light skins has been developed based on a two-step procedure in which a soluble sodium silicate ("water glass") is used as stabilizing agent and chromiumsalts are successively dosed to complete the tanning process. In a preliminary investigation on a laboratory scale, not only the stabilization effect of silicate has been confirmed (shrinkage temperature of the skins around 65°C) but also its capability of allowing a better penetration and fixation of chromium salts (half the dosage usually adopted in traditional chromium tanning was sufficient to obtain a final shrinkage temperature >100°C). Following the laboratory phase, in which the optimal dosages and procedures have been set up, the tanning procedure has been validated on a semi-industrial scale. Among four commercial sodium silicate solutions, one has been selected that has revealed the best performance. Following the optimal recipe (sodium silicate offer 1.5 % as SiO2 pickled weight basis; chromium salt offer 1.5% as Cr2O3 pickled weight basis) the final leather obtained, after a standard fatliquoring/dyeing treatment, showed very good organoleptic and physic-mechanical properties, quite similar to chrome tanned leather. The environmental improvements of the process consist in the preliminary stabilization of the leather so that it can be shaved by obtaining chromium free wastes; besides, the significant reduction of the chromium offer results in a drastic reduction of the chromium content (about one third of the amount typically present in the exhaust float of chromium tannage) of the exhaust effluent. This paper reports also the results of scanning electron microscopy (SEM) coupled with energy x-ray dispersion (EDX) used as investigations methods to follow the tanning process steps. En ligne : https://drive.google.com/file/d/1p9RC8PQgDjIhOWGVlaEpShKQdjqyz_jC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4174 [article]

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