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Modification and application of aminosiloxane in fatliquoring / Keyong Tang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 6 (11-12/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 6 (11-12/2009) . - p. 217-221 Titre : Modification and application of aminosiloxane in fatliquoring Type de document : texte imprimé Auteurs : Keyong Tang, Auteur ; Ren Bin, Auteur ; Qin Shufa, Auteur ; Xuejing Zheng, Auteur ; Dennis C. Shelly, Auteur Année de publication : 2009 Article en page(s) : p. 217-221 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Amino silicone oil was modified with the acetic anhydride to produce a fatliquoring system that yields excellent flexibility, smoothness and elasticity in the finished leathers. The effect of reaction conditions on amino conversion was studied. Results indicate that a 50 %, the reaction temperature was 50-55°C, and the reaction time was 1.5 hours. The treated leathers showed good fullness, softness, elasticity and had a silky feeling. Both the tensile strength and tearing strength of these leathers were improved (6,73 % and 2,88 %, respectively), and the elongation at break and hydrothermal shrinkage temperature were greatly improved by 30,82 % and 10°C, respectively. En ligne : https://drive.google.com/file/d/1-0MGPTWk0DRx7hGS4oOkWK3kxBRlK8rr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7290 [article]

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Lime-free removal of non-collagen proteins from sheepskins : quantitative analysis by gel electrophoresis / Shan Zhi-Hua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 6 (11-12/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 6 (11-12/2009) . - p. 229-232 Titre : Lime-free removal of non-collagen proteins from sheepskins : quantitative analysis by gel electrophoresis Type de document : texte imprimé Auteurs : Shan Zhi-Hua, Auteur ; Li Shu Qing, Auteur ; Liu Jian-Wei, Auteur ; David L. Ollis, Auteur Année de publication : 2009 Article en page(s) : p. 229-232 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Sulfide and lime are the major source of pollution in leather processing. Biotechnological methods have been developed to eliminate the need for sulfide and lime replacing them by enzymes. Removing non-collagen proteins and opening-up the collagen matrix are achieved by the contamination of alkali and salts without lime. In this work, samples of sheepskin were digested with three proteases for de-hairing. The non-collagen proteins were removed using NaOH, CaCl2 and MgCl2. We have demonstrated that gel electrophoresis, techniques can be used for quantitative analysis of the release of nucleic acids and proteins from the enzymatic digested sheepskins. The optimum condition for de-hairing and removing non-collagen proteins were screened using this technique. We found that the best result for the beamhouse operation or pre-tanning was the combiantion of enzyme 166 digestion and soaking with a solution of 1.0%NaOH, 0.25~0.75% MgCl2, 0.25~0.75% CaCl2, at 30°C for 16 hours. Sulfide and lime were not required in the process. En ligne : https://drive.google.com/file/d/1wf4mvQTTKdSXAelkKjgWaw0djkSeeO0S/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7291 [article]

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Phytoremediation of tannery wastewater treated lands : Part I : accumulation of Na+ and Ci- IN Salicornia Brachiata / P. Ramesh Kannan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 6 (11-12/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 6 (11-12/2009) . - p. 233-239 Titre : Phytoremediation of tannery wastewater treated lands : Part I : accumulation of Na+ and Ci- IN Salicornia Brachiata Type de document : texte imprimé Auteurs : P. Ramesh Kannan, Auteur ; R. Rengasamy, Auteur ; C. S. Gnanasekaran, Auteur ; Jonnalagadda Raghava Rao, Auteur ; B. Chandrasekaran, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2009 Article en page(s) : p. 233-239 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In the present study, we studied the feasibility of using Salicornia brachiata as a phytoremediant for accumulation of NaCl present in tannery wastewater. The plants were grown in pots fed with tannery wastewater with varying concentrations of NaCl. The accumulation of Na+ and Cl- increased with increase in salt concentration of tannery wastewater offered to the plant. The growth of the plants with respect to root and shoot length decreased with an increase in salt concentration. However, the accumulation of Na+ and Cl- increased with time of growth and plant density. 51 % of Na+ and 33 % of Cl- were absorbed by the plant at an NaCl concentration of 20 000 ppm at high plant density conditions. Based on the results of trials, Salicornia brachiata was grown on open lands in Tamil Nadu State, India where tannery wastewater was discharged. The TDS levels of the land decreased from 10 300 ppm to 5500 ppm at the end of one year by the growth of S. brachiata. The maximum accumulation of Na+ and Cl- was observed during the period July to September. The results of the present work indicate that S. brachiata ca be used to accumulation of sodium chloride from tannery wastewater discharged lands, thereby contributing towards solving TDS problem arising from the leather sector. En ligne : https://drive.google.com/file/d/1uLOzF0kWyqK0Ok-ZqGMU8Z60vjqdK4ya/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7345 [article]

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Phytoremediation of tannery wastewater treated lands : Part II : Using harvested Salicornia Brachiata plants for the preservation of sheepskins / P. Ramesh Kannan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 6 (11-12/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 6 (11-12/2009) . - p. 240-244 Titre : Phytoremediation of tannery wastewater treated lands : Part II : Using harvested Salicornia Brachiata plants for the preservation of sheepskins Type de document : texte imprimé Auteurs : P. Ramesh Kannan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Swarna Vinodh Kanth, Auteur ; Arjunan Yasothai, Auteur ; S. Deepa, Auteur ; B. Chandrasekaran, Auteur Année de publication : 2009 Article en page(s) : p. 240-244 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this study, preservation of sheepskins using the harvested Salicornia brachiata from tannery wastewater treated lands was used as a replacement for salt in the curing process. Treatment of raw sheepskins using S. brachiata at a concentration of 10 % dry weight resulted in effective preservation at ambient temperature. The extractable nitrogen, content was found to be 3.42 mg/g at an optimized concentration of 10 % S. brachiata. Bacterial count, moisture content, shrinkage temperature, visual and physical properties of Salicornia brachiata preserved skins was comparable to that of conventional salt cured method. The antimicrobial metabolite available in the essential oils and the salt present in the plant has resulted in effective preservation of the skins. The quality of the plant preserved skins was found to be on par with that of salt cured skin. The quality of the resultant crust leathers prepared from S. brachiata preserved skins was found to be comparable with control leathers. En ligne : https://drive.google.com/file/d/1k9859CJ1N7WcoSgsdS8Wm0jF_k4ttZpK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7346 [article]

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Simultaneous assay of trace Cr(VI) and total chromium in tannery effluent. Using flow injection spectrophotometry with Ce(IV) as oxidant / Dai Shijun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 6 (11-12/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 6 (11-12/2009) . - p. 245-249 Titre : Simultaneous assay of trace Cr(VI) and total chromium in tannery effluent. Using flow injection spectrophotometry with Ce(IV) as oxidant Type de document : texte imprimé Auteurs : Dai Shijun, Auteur ; Zhang Xinshen, Auteur ; Yu Lingyun, Auteur ; Xiao Kai, Auteur ; Tong Ling, Auteur ; Sun Dongmei, Auteur ; Tu Jie, Auteur Année de publication : 2009 Article en page(s) : p. 245-249 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A rapid and sensitive method is described for flow injection spectrophotometric determination of trace Cr(VI) and total chromium in tannery effluent. The method is based upon the classical reaction of Cr(VI) with diphenylcarbazide (DPC) to form a water-soluble complex (lambda max=540nm). Cr(III) reacts with DPC only after its on-line oxidation to Cr(VI) by Ce(SO4). Under the optimized conditions, the calibration curves were linear over the range 5-100µg 1-1 and 2à-200 µg 1-1 for Cr(VI) and total chromium, respectively, while the precision close to the quantification limit was satisfactory in both cases (Sr=0.49 % for Cr(VI) and 0.94 % for total chromium (n=10) at the same level, 50µg 1-1, respectively). the application of the method to the analysis of tannery effluent gave accurate results based on recovery studies (98.7-103.3 %). Analytical results of total chromium tannery effluent were in good agreement with that of reference method. En ligne : https://drive.google.com/file/d/19oe3FnTy-paoZE_mXtezaJPqU4Sat55U/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7347 [article]

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Simultaneous online visible detection of sulphide and chloride in tannery effluent by combination of fia and low pressure ion chromatography / Yu Lingyun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 6 (11-12/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 6 (11-12/2009) . - p. 250-254 Titre : Simultaneous online visible detection of sulphide and chloride in tannery effluent by combination of fia and low pressure ion chromatography Type de document : texte imprimé Auteurs : Yu Lingyun, Auteur ; Zhang Xinshen, Auteur ; Dai Shijun, Auteur ; Sun Jing, Auteur ; Yang Yujie, Auteur ; Yu Lan, Auteur ; Xiao Kai, Auteur Année de publication : 2009 Article en page(s) : p. 250-254 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A simple, accurate, sensitive and selective combination of flow injection and low pressure ion chromatography catalytic kinetic spectrophotometric method for simultaneous determination of sulphide and chloride in tannery effluent is proposed in this paper. Firstly, sulphide and chloride are separated by low pressure ion chromatography, and then they respectively accelerate the reaction of indigo carmine and potassium bromate in acidic media with heating. The reaction solutions, the results of sulphide and chloride are separately as follows : the calibration graph was linear in the range of 0.15-5.00mgl-1 and 0.50-33.00mgl-1 ; the detection limit was 0.015mgl-1 and 0.0042mgl-1 ; the relative standard deviation was 2.26 % and 2.45 % (n=10) ; the retention time was 2.0 minutes and 7.2 minutes. This method is suitable for automatic and continuous analysis, and successfully applied to simultaneously determine the contents of sulphide and chloride in tannery effluent. En ligne : https://drive.google.com/file/d/1kvF1A3x156MQeW59f-bG_Nd3lej0h3KW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7348 [article]

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Aqueous finishing with polyisocyanate cross-linked binders / Lluis Ollé in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 6 (11-12/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 6 (11-12/2009) . - p. 222-228 Titre : Aqueous finishing with polyisocyanate cross-linked binders Type de document : texte imprimé Auteurs : Lluis Ollé, Auteur ; M. Cobos, Auteur ; O. Solé, Auteur ; Anna Bacardit, Auteur Année de publication : 2009 Article en page(s) : p. 222-228 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Finition Liants Polyacryliques Polyisocyanates Polyuréthanes Réactions chimiques Réticulants Réticulation (polymérisation) Solutions aqueuses (chimie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Due to increasingly stringent environmental legislation the leather industry has to produce eco-friendly articles. At the same time, it needs to manufacture fashionable and high-quality articles in order to increase competitiveness. As part of this, factories have to replace solvent-based products by water-based products in their finishing formulations to reduce the level of volatile organic compounds. The addition of a cross-linker is required in most cases in order to obtain high performance aqueous finishes. The aim of the present work is to explore the cross-linking reaction between polyisocyanate and both acrylic binders and polyurethanes. A comparision of results shows that polyisocyanate presents a very fast reticulation (cross-linking) speed at room temperature and has a pot-life of only 4 hours. In order to obtain optimum fastness values, different amounts of polyisocyanate are required, the amounts depend on the type of leather used and the physical characteristics of the binders employed. Note de contenu : - FIGURES : 1. Reaction initiation of the isocyanate group - 2. Reaction between isocyanate and functional groups - 3. Diisocyanates most commonly used in industry - 4. Evolution of the cross-linking reaction of acrylic binders A over time. Chrome leather with chrome retanning. 25 wet rubs - 5. Comparaison between cross-linked acrylic binders on chrome leather with chrome retanning. 25 wet rubs, 7 days'storage - 6. Comparaison between cross-linked acrylic binders on vegetable leather. 25 wet rubs, 7 days'storage - 7.Comparaison between cross-linked acrylic binders on chrome leather with res-syn-veg retanning. 25 wet rubs, 7 days'storage - 8. Comparaison between cross-linked polyurethane binders on chrome leather with chrome. 25 wet rubs, 7 days'storage - 9. Comparaison between cross-linked polyurethane binders on vegetable leather. 25 wet rubs, 7 days'storage - 10.Comparaison between cross-linked polyurethane binders on chrome leather with res-syn-veg retanning. 25 wet rubs, 7 days'storage - TABLES : 1. Coating formulations - 2. Physical characteristics of acrylic binders - 3. Physical characteristics of polyurethane binders - 4. Results of colour fastness to dry rubbing. Acrylic binders - 5. Results of colour fastness to wet rubbing. Acrylic binders - 6. Results of colour fastness to dry rubbing. Polyurethane binders - 7. Results of colour fastness to wet rubbing. Polyurethane binders - 8. Results of dry flex resistance - number of rubs x 1000 - 9. Results of wet flex resistance - number of rubs x 1000 - 10. Determination of binder acidity En ligne : https://drive.google.com/file/d/17et4UOXjaozggPe2HNaiDqR7M_LV0Miu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25650 [article]

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