Cleaner chrome tanning - technology of chrome-reduced tanning without salt, pickling and short procedure / Luo Jian-Xun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 6 (11-12/2019)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 6 (11-12/2019) . - p. 289-295 Titre : Cleaner chrome tanning - technology of chrome-reduced tanning without salt, pickling and short procedure Type de document : texte imprimé Auteurs : Luo Jian-Xun, Auteur ; Feng Yan-Juan, Auteur Année de publication : 2019 Article en page(s) : p. 289-295 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acide polyacrylique Déchets -- Réduction Polycarboxylates Poudres Produits chimiques -- Consommation -- Réduction Tannage au chrome Tannage sans sels Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Tannery effluents with high salinity and containing chromium have a serious environmental impact. The traditional chrome tannage that involved the use of sodium chloride, acid and chromium is one of the main origins of salt and chromium pollution. In this study, a non-pickle, chrome-reduced tanning technology was developed. The novel chrome-free agent SL can be directly employed to tan bated bovine hide producing wet-white. The shaved wet-white was pre-treated by a poly-carboxylate auxiliary agent PAA and tanned by chrome powder. It was found that the shrinkage temperature of the wet-white tanned by SL reached over 80°C, the optimal consumption of poly-carboxylate auxiliary agent was 1.5- 2wt% based on the weight of the shaved wet-white, the better chrome-reduced tanning conditions were that the wet-white was tanned with 3-4wt% chromium powder for 150-180 minutes at room temperature when the initial pH value was 3.0-3.5. The next processes were same as those of a traditional chrome tannage. Meanwhile, the shrinkage temperature of the leather tanned by the chrome-reduced tannage reached more than 95°C, the absorption of chromium was 96%, the content of Cr2O3 in the effluent was under 200mg/L. For the chrome-reduced tanned leather,the absorption of dyestuff and fat-liquor reached 99.5% and 82.5% respectively. Compared with the traditional chrome tanning process, not only was the conventional pickling process eliminated, the process was shortened and reduced the pollution of sodium chloride. The process can reduce by 50% the consumption of chrome powder, improve the absorption of chromium and reduce the content of Cr2O3 in effluent. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Tanning properties of the novel chrome-free agent SL - The properties of wet-white tanned by the novel chrome-free agent SL - Optimisation of the offer of chrome tanning agent in tanning process - The properties of poly-carboxylate auxiliary agent in the low-chrome tannage - Contrast experiment between chrome-reduced tanning and traditional chrome tanning - Pilot production of leather tanned by chrome-reduced tannage - RESULTS AND DISCUSSION : Analysis of tanning properties of the novel chrome-free agent SL and its leather - Optimum initial pH of chrome tanning agent on shaved wet-white - Optimum offer of chrome tanning agent for shaved wet-white - Optimum offer of the poly-carboxylate auxiliary agent PAA in chrome-reduced tanning of shaved wet-white - Comparison of chrome-reduced tannage and traditional chrome tanning - The properties of leather tanned by chrome-reduced tannage from pilot production En ligne : https://drive.google.com/file/d/1_b6GCLclh8aX2f9oJk2AMc-M7-OyAz0H/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33205 [article]

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A novel eco-combination tannage of chrome-free leather with softness and high shrinkage temperature / Luo Jian-Xun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 3 (05-06/2022)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 3 (05-06/2022) . - p. 99-105 Titre : A novel eco-combination tannage of chrome-free leather with softness and high shrinkage temperature Type de document : texte imprimé Auteurs : Luo Jian-Xun, Auteur ; Feng Yan-Juan, Auteur Année de publication : 2022 Article en page(s) : p. 99-105 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Cuirs et peaux de bovins Douceur (toucher) Formulation (Génie chimique) Tannage chrome free Tannage combiné Le tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en Å“uvre par exemple Chrome-Végétal ou Chrome-Synthétique Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome-tanned leathers have good comprehensive properties but, tannery effluents with high salinity, chromium and leather scraps containing chromium have a serious environmental impact. Non-chrome tannage is one of tannages that can reduce the pollution. Current non-chrome tanned leather can't, unfortunately meet the needs of the leather market regarding shrinkage temperature, softness, handle and other properties. In this study, a novel combination tannage was developed. The novel non-chrome tanning agent SL was directly employed to tan bated bovine hide producing wet-white. The shaved wet-white was further tanned by Tara, Sellatan RL and Lutan BN and was then fatliquored. It was found that the optimal consumption of the tannins — novel non-chrome tanning agent SL, Tara, Sellatan RL and Lutan BN was 5wt % for SL (based on 150% times of the weight of bated hide pelt) and 6wt% for each of the other three tannins (based on the weight of the shaved wet¬white). The shrinkage temperature of the finished leather can reach over 100°C and the leather has good softness, handle and mechanical properties. Compared with the traditional chrome tanning the conventional pickling process was eliminated, thus the process was shortened and the pollution by sodium chloride was reduced. The quality of the non-chrome leather approaches that of chrome-tanned leather. The non-chrome leathers of pilot production have been approved and accepted by the leather market. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Design of the novel combination tannage - Tanning experiment with different chrome-free agents including the novel chrome-free agent SL, Tara, Sellatan RL and Lutan BN - Contrast experiment between the novel combination tannage and traditional chrome tanning - Pilot production of leather tanned by the novel combination tannage - RESULTS AND DISCUSSION : Analysis of tanning properties of several chrome-free agents and the leather - Analysis of tanning properties of different tanning recipes and the softness of the leather - Comparison of the novel combination tannage and traditional chrome tanning -The properties of leather tanned by the novel combination tannage from pilot production - Table 1 : Procedures of tanning with SL based on bated bovine hide - Table 2 : Procedures of tanning with Tara based on the pickled bovine hide - Table 3 : Procedures of tanning with Lutan BN based on the pickled bovine hide - Table 4 : Parameters of orthogonal experiment - Table 5 : Tanning formulation of L9(34) combination tannage with different tanning agents - Table 6 : Tanning and fat-liquoring process of combination tannage - Table 7 : Tanning results of orthogonal experiment of combination tannage with different tanning agents - Table 8 : The properties of leathers tanned by combination tannage and traditional chrome tanning - Table 9 : Properties of leathers tanned by the combination tannage from pilot production En ligne : https://drive.google.com/file/d/1uIPDvuVJbzq1aHF-sYT5OfP5xV1y7WQP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37752 [article]

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Phosphate modified lanolin fatliquors produced by a sustained-released method / Wang Xue-Chuan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 6 (11-12/2004)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 6 (11-12/2004) . - p. 228-230 Titre : Phosphate modified lanolin fatliquors produced by a sustained-released method Type de document : texte imprimé Auteurs : Wang Xue-Chuan, Auteur ; Feng Yan-Juan, Auteur ; An Hua-Rui, Auteur ; Sun Ming, Auteur Année de publication : 2004 Article en page(s) : p. 228-230 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Huiles et graisses Lanoline Matériaux -- Modifications chimiques Phosphates Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The synthesis of a phosphate modified lanolin fatliquor was made using ethanolamine via lanoline amidate reaction followed by the phosphate reaction by a sustained-release method using P2O5 dispersed in a solvent. The phosphate reaction confirmed that the best conditions were at 75°C for 2.5 hrs with a 3.0:1.0 molar ratio of hydroxy to P2O5. The result indicated that mole fraction of phosphoric acid monoester (MAP) made by the sustained-release method and the conversion of P2O5 increased by 12.3% and 5.7% respectively compared to the direct addition of P2O5 method. Phosphate fatliquor preparation by this method overcomes the odour problem of lanoline and is controllable. It is an eco-friendly reaction without wastage and is in accord with the demands of green production. Note de contenu : - EXPERIMENTAL DETAILS : Materials - Reaction principal of lanolin and alcohol amine - Reaction principal of phosphate - Phosphate reaction - Analysis and testing the of the chemical intermediate - RESULTS AND DISCUSSION : Amidate reaction of lanolin - Selection of solvent for dispersion of P2O5 11 - The phosphate reaction - Table 1 : Factors and levels - Table 2 : Appearance of the phosphate lanolin synthesised using different solvents - Table 3 : The results of the orthogonal experiment En ligne : https://drive.google.com/file/d/1cOW4Eo0nTk2pNJR_24MBNXwTKXmTnxi1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39614 [article]

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