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Novel titanium (IV) tanning for leathers with superior hydrothermal stability / Biyu Peng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 9 (09/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 9 (09/2007) . - p. 261-270 Titre : Novel titanium (IV) tanning for leathers with superior hydrothermal stability : II. The influence of organic ligands on stability and tanning power of titanium sulfate solutions Type de document : texte imprimé Auteurs : Biyu Peng, Auteur ; Dennis C. Shelly, Auteur ; Haojun Fan, Auteur ; Keyi Ding, Auteur ; Bi Shi, Auteur Année de publication : 2007 Article en page(s) : p. 261-270 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A key objective for improving titanium tanning power is increasing titanium solution stability and adjusting both the states and behaviors of the Ti(IV) species in aqueous solution so that titanium tanning can be carried out at a suitable (high) pH. The influence of 35 organic ligands, including mono and multiple carboxylates, amino-ligands and hydroxyl-carboxylates, on the stability and tanning power of titanium sulfate liquors were investigated. Results show that only some hydroxylcarboxylates, such as lactate, tartrate, citrate, sulfosalicylate etc., can effectively improve titanium sulfate solution stability. Only these ligands form stable chelate-type coordination compounds with Ti4+, as shown by potentiometic titration, FTIR spectroscopy and elemental analysis of the coordination complexes. Among these hydroxylcarboxylates, the lactate-masked titanium sulfate system at 0.40-0.5:1 mole ratio of lactate to Ti4+ has the best tanning power. Lactate has a relatively small molecular volume as well as a moderately high formation constant with Ti4+. Leather tanned by a lactate-masked titanium sulfate liquor had the highest titanium content, the best titanium distribution uniformity, a shrinkage temperature, Ts, of 97oC with pleasing softness. En ligne : https://drive.google.com/file/d/1-5vllioomW0H33vW-w9rb7HI-EJHNB2U/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3342 [article]

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Factors that influence the physical properties of goatskins : vegetable retanning agent and sulphated fatty alcohol / Ramón Palop in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 9 (09/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 9 (09/2007) . - p. 271-279 Titre : Factors that influence the physical properties of goatskins : vegetable retanning agent and sulphated fatty alcohol Type de document : texte imprimé Auteurs : Ramón Palop, Auteur ; Agusti Marsal, Auteur ; Albert M. Manich, Auteur Année de publication : 2007 Article en page(s) : p. 271-279 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The effect of three different offers of both vegetable retanning agent (0, 5 and 10 %) and a sulphated fatty alcohol (0, 2 and 4 %) on the physical properties of goatskins was assessed. A standard process was applied to the left halves of goatskins from Nigeria, whereas the right halves were subjected to the corresponding variables. The variation in the results of each studied property was evaluated. The Statgraphics Plus Program was used for the statistical analysis of the results obtained in the experimental plan, which was based on a 32 factorial design for two variables at three levels. Most of the studied leather properties exhibited the highest values with the lowest offer (0 %) of the vegetable retanning agent. However, a 5 % offer of the vegetable retanning agent was required to obtain the highest values of tear resistance for both parallel/perpendicular to the backbone test samples, whereas the highest offer (10 %) provided the best values of grain firmness. The best results of softness and physical resistances were obtained with the highest offer (4 %) of the sulphated fatty alcohol, whereas a 0% offer provided the best results of colour intensity and grain firmness. En ligne : https://drive.google.com/file/d/1vRb3fQsnb0uz7Who8krixCBQ5a8cPu07/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3343 [article]

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Alkaline hydrolysis combined with stir-bar sorptive extraction or sonication for the determination of banned azo dyes in leather / L.-H. Ahlström in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 9 (09/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 9 (09/2007) . - p. 280-287 Titre : Alkaline hydrolysis combined with stir-bar sorptive extraction or sonication for the determination of banned azo dyes in leather Type de document : texte imprimé Auteurs : L.-H. Ahlström, Auteur ; L. Mathiasson, Auteur ; Eva Joo, Auteur ; L. Rowshanzamir, Auteur Année de publication : 2007 Article en page(s) : p. 280-287 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Two approaches based on alkaline hydrolysis, in combination with either stir-bar sorptive extraction (SBSE) or sonication, were developed for the determination of banned azo dyes in bovine leather. All dyes were determined indirectly by measuring their corresponding harmful amines, formed after chemical reduction. Quantification was performed by employing standard addition methodology to compensate for analyte losses due to sample preparation (e.g. incomplete extraction). The mean recoveries (n=3) obtained by employing the SBSE and sonication procedures were 100 percent (RSD=26 percent) and 114 percent (RSD=11 percent), respectively. The linearity of the standard addition curves obtained was reasonable [SBSE (mean R2=0.980) and sonication (mean R2=0.997)]. Both procedures were very simple to perform and provided clean LC-UV chromatograms. Taking into account the repeatability, sonication was considered the preferred alternative. En ligne : https://drive.google.com/file/d/1TqiVu4KmycU7VC8VOxhmF7ZNU2bYr0zn/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3344 [article]

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New micro-sphere application in the leather industry / Dietrich Tegtmeyer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 9 (09/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 9 (09/2007) . - p. 288-292 Titre : New micro-sphere application in the leather industry Type de document : texte imprimé Auteurs : Dietrich Tegtmeyer, Auteur ; F. Silberkuhl, Auteur ; C. Tysoe, Auteur ; W. Zeyen, Auteur ; O. Vorlaender, Auteur Année de publication : 2007 Article en page(s) : p. 288-292 Langues : Américain (ame) Résumé : The upgrade of lower quality hides or skins in order to produce a good quality leather article with acceptable yield and performance is one of the most value adding opportunities for a tanner. A new, innovative wet end technology based on expandable Micro-spheres is being introduced to the leather industry. Tanned leather is treated during the retanning step with a customized penetrating polymer dispersion containing compact micro-spheres. These Micro-spheres have a diameter of 5 - 20 µ and are small enough to migrate into the collagen structure; they are filled with a liquid gas, and can expand through a heat treatment process, up to 40 times of their original size to a much larger, resilient Micro-cell. During the wet end process the polymer together with the micro-spheres penetrate into the leather. After a conventional retanning and drying process the dried crust is then be subjected to a special steam treatment where the Micro-spheres inside the leather are expanded and transformed into larger Micro-cells. This operation results in a dramatic upgrade of the internal structure of the leather, and in turn the grain surface appearance and uniformity, too. The loose areas, blood vessels and other voids in the corium layer are selectively and permanently filled while keeping the leather light and soft. Several applications have already been studied and the feasibility of the technology has been proven, but this new system further opens up a variety of completely new opportunities for the leather industry. En ligne : https://drive.google.com/file/d/1FmJ-h8e9Lo9KHEDr9ZZR45Maai3fDjR1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3345 [article]

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