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Optimizing a sustainable and innovative wet-white process with tara tannins / Joan Carles Castell in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 10 (10/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 10 (10/2011) . - p. 278-286 Titre : Optimizing a sustainable and innovative wet-white process with tara tannins Type de document : texte imprimé Auteurs : Joan Carles Castell, Auteur ; C. Fabregat, Auteur ; Silvia Sorolla, Auteur ; D. Solano, Auteur ; Lluis Ollé, Auteur ; Anna Bacardit, Auteur Année de publication : 2011 Article en page(s) : p. 278-286 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Tannage végétal Tara et constituants C'est un petit arbre épineux avec des gousses plates rouge qui pousse dans les zones sèches du Pérou, Amérique du Sud. Wet-white (tannage) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This study considers the fruit of the tara tree (Caesalpinia spinosa) as a sustainable source for tanning agents and proposes alternatives to the commercial mineral salts and vegetable extracts to comply with an increasing demand that concerns low carbon footprint raw materials and health safety. Although tara tannins have been used in the leather industry and its properties being well known, the experimental part of the work aims to optimize innovative formulations using tara as wet-white pre-tanning agent. Combinations with naphthalene sulphonic and phenol condensation syntans will be used for wet white. Experiments have been designed by Simplex with centroids statistical calculations to obtain an optimized formulation. Tests are evaluated determining shrinkage temperature, tensile strength, elongation, tear resistance and light fastness. Note de contenu : - Characterization of commercial tara tanning powder - Designof a pretanning process with tara - Products, materials and equipment En ligne : https://drive.google.com/file/d/1kPDSTEmgpPC3EMkqNVGwW_07gYzVagoI/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12210 [article]

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Preparation and properties of starch modified by glutaraldehyde and citric acid / S. H. Lu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 10 (10/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 10 (10/2011) . - p. 287-293 Titre : Preparation and properties of starch modified by glutaraldehyde and citric acid Type de document : texte imprimé Auteurs : S. H. Lu, Auteur ; J. P. Duan, Auteur ; R. Gong, Auteur ; X. L. Yan, Auteur Année de publication : 2011 Article en page(s) : p. 287-293 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amidons Citrique, Acide L'acide citrique est un acide alpha hydroxylé de formule C6H8O7. Il joue un rôle central dans le métabolisme de tous les organismes vivants et tient son nom de son origine; le citron. L'acide citrique est biodégradable et n'est pas toxique pour l'homme ni pour l'environnement. Cependant, comme tout acide, il est irritant et peut provoquer des brûlures s'il entre en contact prolongé avec des muqueuses. À pH physiologique, il est présent sous forme de sa base conjuguée, le citrate, qui est un chélateur de l'ion calcium dans le sang. Fourier, Spectroscopie infrarouge à transformée de Glutaraldéhyde Spectroscopie de la résonance magnétique nucléaire Tannage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The modified starch tannage was prepared by acetalation reaction of degradation starch with glutaraldehyde (GA) and citric acid (CA) in turn. The conditions of modified starch were investigated. The results showed that the suitable degradation starch was obtained by mixing of 22.5g starch, 1g ammonium persulfate (APS) and 127.5g water at 95°C for 1h. The optimum modified starch tannage was obtained by acetalation reaction of degradation starch with 4 mol/AGU GA and CA at 85°C for 5h in turn, respectively. The shrinkage temperature (Ts) of tanned leather by the modified starch increased from 41.3°C to 83.8°C. The modified starch can be used as tannage for making leather. Meanwhile, the chemical structure of the starch tannage was characterized by FTIR and NMR, which provided the evidence that GA and CA were bonded on the repeat unit of starch through substituted reaction. Note de contenu : EXPERIMENTAL : Preparation of modified starch tannage by GA and CA - Application of modified starch tannage - Test measurements RESULTS AND DISCUSSION : Effect of degradation degree on property of modification starch - The effect of reactant concentration and temperature on DS - The structure characterization of modified - Application properties of modificatio starch tannage En ligne : https://drive.google.com/file/d/1A9fV2e7IkPeAxtpeBd_-tzC7NBAR9kYm/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12214 [article]

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Determination of short polychlorinated alkanes in leather using gas chromatography-electron capture negative chemical ionization mass spectrometry / A. Rey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 10 (10/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 10 (10/2011) . - p. 294-302 Titre : Determination of short polychlorinated alkanes in leather using gas chromatography-electron capture negative chemical ionization mass spectrometry Type de document : texte imprimé Auteurs : A. Rey, Auteur ; N. Blanc, Auteur ; A. Berthod, Auteur Année de publication : 2011 Article en page(s) : p. 294-302 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chromatographie en phase gazeuse Extraction (chimie) Filtration Hexane Polychloro alcanes Spectrométrie de masse à ionisation chimique Ultrasons Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Polychlorinated alkanes (PCA) are organic compounds of general formula C2H(2x+2-y)Cly. PCA are extremely complex industrial mixtures of randomly chlorinated petroleum distillate. They are made of several thousands structural isomers. The short chain isomers (sPCA) have a carbon number between 10 and 13. All PCAs have a high environmental persistence and accumulate in the biosphere. They were included in all regulatory programs implying reliable methods for their determination in various samples. The content of sPCA is regulated in leather. The objective of this study was to develop a reliable and sensitive analytical method to determine and to quantify sPCA in real-world leather samples. The protocol started by an ultrasound-assisted hexane extraction of the ground leather sample. The extract was purified by filtration on a Florisil® (magnesium silicate) column with hexane/dichloromethane 9/1 v/v eluant. The concentrated extract was redissolved in 5 mL isooctane for analysis with a gas chromatograph coupled with a mass spectrometer in the electron capture negative ionization mode. The method was validated and used with real-world samples giving a reliable limit of quantification of 2 mg/kg +/- 0.2 mg/kg for the sPCA family. Note de contenu : EXPERIMENTAL : Chemicals - Sampling - Extraction, clean-up - Chromatographic equipment POLYCHRLORINATED ALKANES PROPERTIES : Production - Phsycochemical properties and composition - Hydrophobicity - Uses RESULTS AND DISCUSSION : Optimisation of extraction and clean-up procedure - PCA quantification - Real samples En ligne : https://drive.google.com/file/d/11wpKcdYWzj1qhJ25GJHUCs4BEN3BNsmA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12215 [article]

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Dyeing/cross-linking property of natural iridoids to protein fibers in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 10 (10/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 10 (10/2011) . - p. 303-308 Titre : Dyeing/cross-linking property of natural iridoids to protein fibers : Part II. Color-forming rules and mechanism of methylamine and protein fibers dyed by four natural iridoids Type de document : texte imprimé Année de publication : 2011 Article en page(s) : p. 303-308 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorants Cuirs et peaux -- Teinture Iridoïdes Méthylamine Protéines Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Color-forming rules and mechanism of methylamine and protein fibers dyed by four iridoids, genipin, loganin aglycone, oleuropein aglycone and E-6-O-methoxycinnamoyl scandoside methyl ester aglycone were researched. The results showed that, before the formation of final pigments, intermediates were formed. A continuous color change following classical color matching principles was observed when the pigments formed by genipin and oleuropein aglycone reacted individually with methylamine were mixed. However, when genipin and oleuropein aglycone reacted simultaneously with methylamine, the situation was different. The results of single dyeing and combination dyeing of protein fibers showed that color of the dyed protein was the same as that formed by each iridoid with methylamine. This means that the structure of iridoid is the dominant factor for the color-forming process. The classical color-matching principle would be observed when two iridoids were applied to dye protein fibers separately. However, during simultaneous combination dyeing, the classical color-matching principle was not observed. Note de contenu : EXPERIMENTAL : Materials - Reaction of MA with iridoid aglycones - Dyeing reaction of four iridoids with protein fibers RESULTS AND DISCUSSION : Iridoid treatment of MA - Dyeing reaction of four iridoids with protein fibers En ligne : https://drive.google.com/file/d/1ot1oQyqYYnOT2557c2Du5piMK-t2nCXf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12216 [article]

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