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JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) / Union internationale des sociétés de techniciens et chimistes des industries du cuir . Vol. 88, N° 1Mention de date : 01-02/2004Paru le : 15/01/2004 |
Dépouillements
Ajouter le résultat dans votre panierProtein retanning and filling agent from vinyl monomer graft modification of chrome shavings hydrolysate / Ma Jianzhong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 1 (01-02/2004)
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Titre : Protein retanning and filling agent from vinyl monomer graft modification of chrome shavings hydrolysate Type de document : texte imprimé Auteurs : Ma Jianzhong, Auteur ; Liu Lingyun, Auteur ; Xu Chunhua, Auteur ; Wang Wenqi, Auteur ; Zongsui Yang, Auteur Année de publication : 2004 Article en page(s) : p. 1-5 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage
Cuirs et peaux -- Déchets -- Recyclage
Greffage (chimie)
Hydrolyse
Monomères
polymères vinyliques
Recyclage (déchets, etc.)
Retannage
Tannage au chromeIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A retanning agent was synthesized from chrome-shaving hydrolysate modified with vinyl monomers. The chrome-shavings were hydrolyzed without de-chroming and were then modified by grafting with vinyl monomers. To provide proof of grafting, the modified hydrolysate was identified by indanthrone, and infrared spectroscopy (IR) The amino acid composition of the hydrolysate and modified hydrolysate were analysed. The results show that the vinyl polymer had been grafted on the polypeptide chains of the hydrolysate with covalent bonds.
This protein retanning agent containing chrome was beneficial to the utilization of chrome shavings. Good stretch and filling properties were obtained from leather retanned with this agent.Note de contenu : - EXPERIMENTAL PROCEDURE : Hydrolysis of chrome-shavings - Comparison application experiment with the modified chrome shavings hydrolysate - Proof of grafting modification of chrome-shavings hydrolysate
- RESULTS AND DISCUSSION : Results of physical and chemical inspection of chromeshavings (Table II) - Results of Orthogonal Design experiments on modification of chrome-shavings hydrolysate by vinyl monomer grafting. (Tables III and IV) - Proof of Graft Modification - FTIR Spectroscopy - Amino Acid Composition Analysis Results
- Table 1 : The factors and levels of the orthogonal design for graftmodification of chrome-shavings hydrolysate with vinyl monomers
- Table 2 : Physical and chemical inspection of chrome-shavings
- Table 3 : Results of orthogonal design experiments of modification of chrome-shavings hydrolysate by grafting with vinyl monomers
- Table 4 : The experimental plan and comprehensive analysis results of orthogonal design experiments
- Table 5 : Thickness increment ratio for 3 types of retanning agent
- Table 6 : Results of physical-mechanical testing of leathers retanned with 3 types of retaning agent
- Table 7 : Amino acid composition of chrome-shavings
- Table 8 : Amino acid composition of modified product of chrome-shavings hydrolysateEn ligne : https://drive.google.com/file/d/1aKiyWlfPIryl8jdctrJBHjh4Kf__6y0-/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39647
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 1 (01-02/2004) . - p. 1-5[article]Determination of chloride and sulphate ions in leather pickling liquor by low-pressure ion chromatography / Bo Li in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 1 (01-02/2004)
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Titre : Determination of chloride and sulphate ions in leather pickling liquor by low-pressure ion chromatography Type de document : texte imprimé Auteurs : Bo Li, Auteur ; Fan Zhang, Auteur ; Zhang Xinshen, Auteur Année de publication : 2004 Article en page(s) : p. 6-9 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse quantitative (chimie)
Chromatographie
Eaux usées -- Analyse
Ions chlorure
PicklageLe picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu.
Statistique
SulfatesLe sulfate est le sel de l'acide sulfurique H2SO4. La formule de l'ion sulfate est SO42-.Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The deleterious effects on the quality of soil and ground waters of electrolytes discharged as a result of salts used by the tanning industry is of concern now more than ever. The electrolyte is usually in the form of chloride and sulphate and thus it is necessary to determination chloride ion and sulphate ion in tanning effluents. The determination of chloride ion and sulphate ion in leather pickling liquor is important to determine the salt’s contribution to the total salt concentration of the sewage for each process. The aim of this work is to apply LPIC (without using a suppressor column) to the quantitative determination of chloride ion and sulphate ion in pickle liquor.
Tests of precision, recovery and linear range were also conducted to evaluate the above method. The results show that the coefficients of variation are less than 4.77% or 3.76% with recoveries of 99.95% and 102.31% for chloride ion and sulphate ion respectively. Two calibration curves were obtained over the concentration range of 10 to 30 mg/L for chloride and 30 to 300 mg/L for sulphate. The detection limits of the method developed for chloride ion and sulphate ion are 0.144 and 2.853 mg/L respectively. LPIC performed without a suppressor column is shown to be suitable as a method for quantitative determination of chloride ion and sulphate ion in leather pickling liquor.Note de contenu : - EXPERIMENTAL PROCEDURE : Apparatus - Reagents and solutions - Sample preparation
- RESULTS AND DISCUSSION : Choice of column - Choice of eluent - Eluent concentration - Effect of pH - Linearity tests - Precision tests - Detection limit - Analysis of real samples
- Table 1 : Chromatographic conditions for the analysis of inorganic anions
- Table 2 : Result of the statistical treatment performed on pairs of LPIC data
- Table 3 : Results of precision tests
- Table 4 : Determination of chloride and sulphate concentration in leather pickling liquorEn ligne : https://drive.google.com/file/d/1UboMr69zI0I7MlSoXPCZw8XWfzWn0r-n/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39648
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 1 (01-02/2004) . - p. 6-9[article]The relationship between the morphological change of the elastic fibres of goatskin and the effects of bating under different conditions / Ding Haiyan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 1 (01-02/2004)
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Titre : The relationship between the morphological change of the elastic fibres of goatskin and the effects of bating under different conditions Type de document : texte imprimé Auteurs : Ding Haiyan, Auteur Année de publication : 2004 Article en page(s) : p. 10-14 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse morphologique
Collagène
ConfitageLe confitage est une action biochimique effectuée au moyen de produits enzymatiques, qui a pour but de dégrader les fibres élastiques, contribuant ainsi à augmenter la souplesse du cuir. En outre, les enzymes complètent la dégradation des résidus épidermiques, donnant ainsi une fleur plus propre et plus lisse.
Cuirs et peaux -- Analyse
Cuirs et peaux de chèvres
ElasticitéIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Morphological changes in the ultrastructure of the elastic fibres of goatskins (from the Hankou area of China) were observed simultaneously by scanning electron microscopy and transmission electron microscopy for different bating conditions in comparison with that of collagenous fibres The results showed that the effect of normal bating conditions was appropriate for the small morphological changes of the elastic fibres whilst giving the appropriate structural opening up of the collagen fibres.
Excessive opening up of the collagen fibres occurs when the elastic fibres are broken and seriously digested, it is not expected that this result will occur in practical production.
The results showed that it is impossible to remove elastic fibres under normal bating conditions. The removal of the elastic fibres is not, of course, the ultimate aim of bating, elastic fibres do have a certain influence on the softness of the finished leather but it is not a chief factor.Note de contenu : - EXPERIMENTAL PROCEDURE : Sample preparation - Specimen preparation for TEM - Specimen preparation for SEM
- RESULTS AND DISCUSSION : The morpholological change of collagenous fibres in different bating conditionsEn ligne : https://drive.google.com/file/d/1OXi5RcZIxvnxgv9qUZAOkek-1YIcx2Rc/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39649
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 1 (01-02/2004) . - p. 10-14[article]A modified method for fixation and staining of the elastic fibre in goatskin at the ultrastructural level / Ding Haiyan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 1 (01-02/2004)
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Titre : A modified method for fixation and staining of the elastic fibre in goatskin at the ultrastructural level Type de document : texte imprimé Auteurs : Ding Haiyan, Auteur ; Liang Chengjian, Auteur Année de publication : 2004 Article en page(s) : p. 15-17 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux de chèvres
Fixation (chimie)
Matériaux -- Coloration
TaninsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study describes an improvement to the tannic acid (TA) fixation technique. A comparison of the result of improved method with that of the conventional method and an en bloc staining method, shows that this method has a unique effect for characterizing the elastic fibres of goatskin. Moreover, their morphology is related to the concentration of TA, and the greatest effect occurs at a concentration of 0.01%. This method has furnished an effective means for researching the ultrastructural changes of elastic fibres in hides and skins in leather manufacturing and their pathological changes in the biology and medicine fields. Note de contenu : - Conventional method
- En bloc staining method
- Tannic acid fixation methodEn ligne : https://drive.google.com/file/d/1ZpUCq_PsD-yodx_qpX8O8WJtAyL_p0gR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39650
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 1 (01-02/2004) . - p. 15-17[article]Experimental studies in restoration and conservation of historical leather / Z. Bajza in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 1 (01-02/2004)
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Titre : Experimental studies in restoration and conservation of historical leather Type de document : texte imprimé Auteurs : Z. Bajza, Auteur ; P. Hitrec, Auteur ; M. Muzic, Auteur ; D. Medic, Auteur ; D. Krstic, Auteur Année de publication : 2004 Article en page(s) : p. 18-22 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse quantitative (chimie)
Antiquités (objets anciens) -- Conservation et restauration
Cuirs et peaux -- Analyse
Objets d'art -- Conservation et restaurationIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : This article investigates the main properties of 300-year old leather wallhanging dating to the late 17th century, originating from St. Peter and Paul’s church in the village of Sveti Petar u s˘umi in Istria.
Tests were carried out according to standard IUC methods (ISO 4047), and microphotographs of cryostat prepared test samples were taken. The leather surface layer was investigated using a UV (ATR) spectrophotometer, thinlayer chromatography and a PIXE spectrophotometer. Examination indicates that the leather is calf-bovine and was vegetable tanned.
Formal suggestions were made for cleaning and preserving the leather wallhanging, it was suggested that the best solution would be to attach (adhere) the historic leather to new leather.Note de contenu : - MATERIALS AND METHODS : Microscopic examination - Thin-layer chromatography - Analysis by PIXE spectroscopy - nuclear IRB micro-test (of the red glaze)
- RESULTS AND DISCUSSION : Organoleptic assessment - Determination of volatile matter in leather (water, etc.) - Determination of materials soluble in tetrachloromethane - Determination of pH and difference value of the aqueous leather extract - Determination of total ash - Thin-layer chromatography - Examination of the surface layerEn ligne : https://drive.google.com/file/d/1SO3DzSqPU531XaIwPKqj2ynsnmZjZJmK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39651
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 1 (01-02/2004) . - p. 18-22[article]Two stage chrome tanning system (basification in a separate float) influence of organic SO2 reduced chrome tan / Victor John Sundar in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 1 (01-02/2004)
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Titre : Two stage chrome tanning system (basification in a separate float) influence of organic SO2 reduced chrome tan Type de document : texte imprimé Auteurs : Victor John Sundar, Auteur ; Chellappa Muralidharan, Auteur Année de publication : 2004 Article en page(s) : p. 23-26 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Basification (chimie)
Caractérisation
Chrome trivalent -- Oxydation
Cuir -- teneur en chrome
Cuirs et peaux -- Analyse
Dioxyde de soufreLe dioxyde de soufre, également appelé anhydride sulfureux (nom qui n’est plus employé en chimie), est un composé chimique de formule SO2. Il s'agit d'un gaz incolore, dense et toxique, dont l'inhalation est fortement irritante. Il est libéré dans l'atmosphère terrestre par les volcans et par de nombreux procédés industriels, ainsi que par la combustion de certains charbons, pétroles et gaz naturels non désulfurés. L'oxydation du dioxyde de soufre, le plus souvent en présence de catalyseurs tels que le dioxyde d'azote NO2, conduit au trioxyde de soufre SO3 et à l'acide sulfurique H2SO4, d'où la formation de pluies acides16. Elle a pour conséquence une inflammation de l'appareil respiratoire.
Le dioxyde de soufre est utilisé comme désinfectant, antiseptique, antibactérien, gaz réfrigérant, agent de blanchiment, gaz catalyseur pour les noyaux de fonderie dans le procédé Ashland et comme conservateur de produits alimentaires, notamment pour les fruits secs, dans la production de boissons alcoolisées et dans l'élaboration du vin. (Wikipedia)
Eaux usées -- Analyse
Stabilité thermique
Tannage au chrome
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The two stage chrome tanning process has been investigated for its properties of high chrome exhaustion and the possibility of recycling the spent liquor. Chrome salts prepared by sugar and SO2 reduction have been used in the system. The investigations indicated that irrespective of the nature of tanning salt used the system provides waste minimisation and pollution reduction. Speciation studies support the earlier finding that higher oligomeric species of chromium provide greater hydrothermal stability regardless of the tanning methodology or tanning salt used. Note de contenu : - EXPERIMENTAL METHODS : Current process methodology - Tanning trials by the two-stage tanning system (basification in a separate float)
- RESULTS AND DISCUSSION : Thermal stability - Estimation of chromium - Estimation of sulphate and chloride in spent solutions
- SPECIES SEPARATION STUDIES IN BCS AND IN SPENT TANNING SOLUTIONS
- RESULTS AND DISCUSSION : Chromium in spent tan liquors - Thermal stability - Characterisation of first stage liquor - Assessment of wet blue leathers
- Appendix - Chrome analysis oxidation methods
- Table 1 : Chromium present in spent tan liquor bath
- Table 2 : Peak temperature of thermograms and chromium content of wet blue
- Table 3 : Distribution of species in original BCS and in first-stage spent liquor
- Table 4 : Characteristics of first stage spent liquors
- Table 5 : Chromium content of wet blueEn ligne : https://drive.google.com/file/d/1uXg_mFr6WAghsEZfDattria3rOeoVm0e/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39652
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 1 (01-02/2004) . - p. 23-26[article]Seasonality in physico-chemical parameters of tannery wastewater passing through the East Calcutta wetland ecosystem / B. Chattopadhyay in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 1 (01-02/2004)
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Titre : Seasonality in physico-chemical parameters of tannery wastewater passing through the East Calcutta wetland ecosystem Type de document : texte imprimé Auteurs : B. Chattopadhyay, Auteur ; S. Chatterjee, Auteur ; Subhra Kumar Mukhopadhyay, Auteur Année de publication : 2004 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Industrie -- Aspect de l'environnement
Cuirs et peaux -- Industrie -- Inde
Eaux usées -- AnalyseIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Areas under investigation are located within the East Calcutta wetlands, India, a declared Ramsar site (lat.22°33’ - 22°40’N; long. 88°25’ - 88°35’E). Peripheral regions of East Calcutta wetland areas harbour 538 tanneries and a large amount of composite tannery effluent and solid wastes from these tannery agglomerates are discharged without pre-treatment. In the present investigation physico-chemical parameters, like air and water temperatures, water velocity, pH, conductivity, TDS, TSS, DO, NO3 1-, PO4 3-, Cl1-, S2-, total hardness, alkalinity, acidity, BOD5 20 and COD of the composite wastewater were measured for two years to record changes along the gradient, seasonal
events and the ameliorating capacities of the wetland ecosystem.
The Dissolved Oxygen (DO) content of the wastewater increased gradually along the length of the canal from the source towards the river mouth. Water velocity at different study sites varied from 0.061 – 0.333 m s-1.
Such quiescent flow led to lower concentrations of TSS at distant sites. There was a 10 fold increment of DO at Site-II, 44 fold at Site-III and 424 fold at Site-IV compared to Site-I.
A considerable gain in phosphate concentration was recorded from Site-II onwards, when a large amount of domestic sewage was mixed with the composite effluent. Unlike phosphate, nitrate was present in considerable amounts in the tannery wastewater.
Seasonal fluctuation of both CO3 hardness and total hardness showed comparable patterns there were two peaks, one each during spring and in post monsoon periods.
Sulphide concentrations at different sites along the wastewater-carrying canal did not reduce greatly with distance from the source. At most sites a rise in the sulphide concentrations in summer and winter months and a dip during the post-monsoon period were evident. Significant amelioration of the tannery effluent was made by the wetland biota.Note de contenu : - MATERIALS AND METHODS : Sampling sites - Analysis of samples
- RESULTS : Temperature - Dissolved Oxygen - Total Dissolved Solids and Conductivity - Total Suspended Solids - Phosphate - Nitrogen - Alkalinity - Chlorides - Sulphides - BOD - COD -
- Table 1 : Seasonal fluctuations of physico-chemical parameters of wastewater at Site-I
- Table 2 : Seasonal fluctuations of physico-chemical parameters of wastewater at Site-II
- Table 3 : Seasonal fluctuations of physico-chemical parameters of wastewater at Site-III
- Table 4 : Seasonal fluctuations of physico-chemical parameters of wastewater at Site IV
- Table 5 : Mean and standard deviation values (N = 24each) of the physico-chemical parameters measured at the study sites (April 1998 - March 2000)
- Table 6 : Factor score coefficient matrix of physico-chemical parameters (N = 24 each) at the study sites (Sites I –VI) and all the sites put together
- Table 7 : Multiple regression based on factor analysis considering parameter of component 1 having R.F.L.=1.00 as dependent and other dominant parameters of component 1 as independent variablesEn ligne : https://drive.google.com/file/d/1DLir7oWklL7hCqLA8BRI4162a6zmnec_/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39653
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 1 (01-02/2004)[article]