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Zirconium-oxazolidine combination tannage for sheep garment leather / Qiang Tao-Tao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 2 (03-04/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 2 (03-04/2009) . - p. 35-39 Titre : Zirconium-oxazolidine combination tannage for sheep garment leather Type de document : texte imprimé Auteurs : Qiang Tao-Tao, Auteur ; Wang Xue-Chuan, Auteur ; Ren Long-Fang, Auteur ; Ren Yong-Qiang, Auteur Année de publication : 2009 Article en page(s) : p. 35-39 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux de moutons Oxazolidine Tannage au zirconium Vêtements en cuir Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Increasing environmental consciousness has impacted on the pollution caused by chrome tanning which has become a difficult problem requiring an urgent solution leading to studies on chrome-free tanning system. A new zirconium-oxazolidine combination tanning system has been developed. The amount of zirconium-oxazolidine has been optimized at 2.5 % and 3.0 % (based on limed weight of skins). The influence of ligands on the shrinkage temperature (Ts) of leathers has also been studied and zirconium-oxazolidine combination tanned leathers showed Ts above 92°C. Zirconium-oxazolidine tanned sheep garment leather is much whiter than the chrome tanned, being close to the standard whiteness. The degradation rate of zirconium-oxazolidine combination leather is 18.83 % after 45 days soil burial and is much quicker than that of chrome tanned leather which is 5.78 % after 45 days. SEM observation revealed that the non-degraded surface structure was more regular than that of chrome leather degraded for 30 days. The zirconium-oxazolidine combination tanned leather degraded more easily than chrome leather, which is of benefit for the sustainable development of the leather industry. En ligne : https://drive.google.com/file/d/1gAsQ1dzoIhDiYfMt3nGAiWnl1bznjaNJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5088 [article]

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Peracetic acid deliming. Part II / Justa Sirvaityte in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 2 (03-04/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 2 (03-04/2009) . - p. 40-45 Titre : Peracetic acid deliming. Part II : Pickle-free and low-pickle processing of peracetic acid delimed pelt Type de document : texte imprimé Auteurs : Justa Sirvaityte, Auteur ; Virgilijus Valeika, Auteur ; Viktoriia Plavan, Auteur Année de publication : 2009 Article en page(s) : p. 40-45 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The article presents an investigation of the behaviour of PAA delimed pelt in subsequent processing. Peracetic acid is one method of deliming. Enzymes which are active in acidic media are used for bating such pelts. It was established that chroming can be carried out directly after deliming and bating, chroming requires low basicity chromium compounds with materials for decreasing the initial basicity and to increase the basicity during chroming, which also becomes longer. Another way is with a short treatment by NaCl or oxalic acid solution after deliming and bating. Chroming after such treatment allows a good exhaustion of chromium and gives leather having high shrinkage temperature and Cr2O3 content. Replacing ammonia compounds by PAA in deliming and replacing a conventional pickling by a short treatment with NaCl and oxalic acid, or avoiding any treatment before chroming saves chemicals, shortens the process and decreases environmental pollution. En ligne : https://drive.google.com/file/d/1K5sTWQ9veitwSZG3IPX6-jEuioxH8F93/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5089 [article]

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On-line flow injection spectrophotometric determination of chloride ion in tannery effluent / Yu Lingyun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 2 (03-04/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 2 (03-04/2009) . - p. 46-50 Titre : On-line flow injection spectrophotometric determination of chloride ion in tannery effluent Type de document : texte imprimé Auteurs : Yu Lingyun, Auteur ; Tu Jie, Auteur ; Xiao Kai, Auteur ; Dai Shijun, Auteur ; Tong Ling, Auteur ; Sun Dongmei, Auteur ; Zhang Xinshen, Auteur Année de publication : 2009 Article en page(s) : p. 46-50 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The chloride ion (Cl-) is very important to both human and animal health, and directly impacts on the natural environment. This paper proposes a simple, accurate, sensitive and selective flow injection catalytic kinetic spectrophotometric method for the rapid determination of chloride ion in tannery effluent. in acidic media and with heat, the reaction of indigo carmine and potassium bromate is catalysed by the chloride ion. The absorbance of this reaction solution was recorded at 610nm. Chemical factors and FIA variables affecting the system were also discussed. The linear concentration range of the calibration curve was from 0.2-420mg L-1 of standard solutions. The relative standard deviation was 0.88 % for 28.0mg l-1 chloride ion( n=9), and the detection limit was à.009mg l-1 calculated from three times the average background noise. This method, which is suitable for automatic continuous analysis, has been successfully applied to the determination of chloride ion in tannery effluent. En ligne : https://drive.google.com/file/d/1t7fxY4E5Cd-uVKjySpObOeZ5DgtZ5O6F/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5091 [article]

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Enzyme unhairing - An eco-friendly biotechnological process / Wang Rui in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 2 (03-04/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 2 (03-04/2009) . - p. 51-55 Titre : Enzyme unhairing - An eco-friendly biotechnological process Type de document : texte imprimé Auteurs : Wang Rui, Auteur ; Chen Min, Auteur ; Li Zhiqiang, Auteur Année de publication : 2009 Article en page(s) : p. 51-55 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Global environmental regulations are changing the leather industry. Conventional unhairing contributes most of the pollution in the industry, such as hydrogen sulfide and lime. Ever-increasing attention to the environmental impact of the leather industry has necessitated the development of enzymatic unhairing as a potent alternative to polluting chemicals. Enzymes are gaining increasing importance in the unhairing process, eliminating the need for sodium sulfide. This review discusses the enzymatic unhairing used in leather processing and introduces more information about enzymatic unhairing. This paper also summarises progress of enzymatic unhairing and looks ahead at its application prospect and development direction. En ligne : https://drive.google.com/file/d/1ZM5PFxeN6k9OGrQt7zCcm4retS-0Ff2i/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5092 [article]

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Environment-friendly lime-free liming / Yuansen Liu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 2 (03-04/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 2 (03-04/2009) . - p. 56-60 Titre : Environment-friendly lime-free liming Type de document : texte imprimé Auteurs : Yuansen Liu, Auteur ; Chen Yi, Auteur ; Haojun Fan, Auteur ; Hu Zhou, Auteur ; Zhaoyang Luo, Auteur ; Bi Shi, Auteur Année de publication : 2009 Article en page(s) : p. 56-60 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : As a substitute for lime, a novel liming agent based on sodium silicate and enzyme was applied in a lime-free liming process. This innovative process achieved an equivalent effect on fibre opening, shrinkage temperature (Ts) and mechanical properties of crust leather compared with a conventational liming process. The environmental factors, including total solids (TS), chemical oxygen demand (COD), sludge concentration and biodegradability of waste water were all superior to the conventional liming process, showing environmental-friendly characteristics. Another interesting phenomenon was that the traditional deliming process based on ammonium salt could be omitted. As a result, the NH3-N concentration in wastewater was greatly reduced and there is a large water saving. En ligne : https://drive.google.com/file/d/1LZW55hLQGazJK2UuDdozPe2_SpvRrfM4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5093 [article]

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Hyperbranched polymer polyols : their preparation, modification and use in the leather industry / Wang Xuechuan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 2 (03-04/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 2 (03-04/2009) . - p. 61-72 Titre : Hyperbranched polymer polyols : their preparation, modification and use in the leather industry Type de document : texte imprimé Auteurs : Wang Xuechuan, Auteur ; Yuan Xuzheng, Auteur ; Qiang Taotao, Auteur ; Ren Longfang, Auteur Année de publication : 2009 Article en page(s) : p. 61-72 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A series of hyperbranched (poly(amine-ester) polyols (HPAEPs) were synthesized by the polycondensation of N,N-diethylol-3-amine-methylpropionate [prepared by the Michael addition reaction of methyl acrylate (MA) with diethanolamine (DEA)] as an AB2-type monomer with trimethylol propane (TMP) as the core moiety, proceeding in one-step procedure in the melt with p-toluenesulfonic acid (p-TSA) as catalyst. Then, it was modified by diethyl malonate (DEM) in the presence of catalyst (anhydrous K2CO3) via transesterification to obtain a water-soluble hyperbranched polymer with active methylene (HPAM), which can be used as formaldehyde elimination agent. The obtained polymers were characterized by FTIR and TGA. the application results show that HPAEP can be used as the retanning agent with reinforcing performance (tear strength increased by 23.3 % and tensile strength increased by 11.3 %) and bleaching efect (whiteness value increase by 19.8 %) meanwhile. The removal efficiency of free-formaldehyde in leather could reach 56.25 % at 2 % dosage of HPAM for capturing 5h. En ligne : https://drive.google.com/file/d/12Z2LzH5ZpratMjYdV_Cs8EhKwA1PLKpP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5094 [article]

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Lower pollution pickle-chrome process : a no-float / low-salt approach / Anna Bacardit in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 2 (03-04/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 2 (03-04/2009) . - p. 67-72 Titre : Lower pollution pickle-chrome process : a no-float / low-salt approach Type de document : texte imprimé Auteurs : Anna Bacardit, Auteur ; D. Borràs, Auteur ; Héctor Palomares, Auteur ; Esther Bartoli, Auteur ; Josep Maria Morera, Auteur ; Lluis Ollé, Auteur Année de publication : 2009 Article en page(s) : p. 67-72 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The tanning process generates large amounts of effluents containing chrome (III) and chlorides. This paper deals with a new tanning process based on improving the efficiency of chemical use in order to improve the environmental behaviour of tanneries. This process develops a non-float system with a minimal amount of NaCl, reduced chrome salt addition and increased final tanning temperature at 55°C. The properties of the leathers were similar to those from a traditional process. However, the new process gave 97 % less residual chrome and a 95 % decrease in the chlorides discharged. Moreover, the new process involves 100 % savings in water, about 78 % in NaCl and about 32 % in Cr2O3 addition. Consequently the process is 55 % more cost-effective than the traditional process. En ligne : https://drive.google.com/file/d/1bahfPwv2kWQLVrwPK-7hl2eCw8lULaVy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5095 [article]

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