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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. 89, N° 5Mention de date : 09-10/2005Paru le : 15/09/2005 |
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Ajouter le résultat dans votre panierPreparation and application of vinyl polymer-mmt nano tanning agent / Ma Jianzhong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 5 (09-10/2005)
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Titre : Preparation and application of vinyl polymer-mmt nano tanning agent Type de document : texte imprimé Auteurs : Ma Jianzhong, Auteur ; Yun Chu, Auteur ; Gao Dangge, Auteur ; Lv Bin Dai Jianfang, Auteur Année de publication : 2005 Article en page(s) : p. 181-185 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage
Caractérisation
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés physiques
Mesure
Montmorillonite
Nanoparticules
Perméabilité
Polymères -- Synthèse
polymères vinyliques
Tannage au chrome
Température de retraitIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this paper, montmorillonite (MMT) was first modified with dimethyldiallyl ammonium chloride (referred to as DMDAAC) and cetyl trimethylammonium bromide (CTAB) through a cation exchanging reaction. The modified MMT and the vinyl polymer were then used to prepare composites which were then characterized by XRD. Finally, the vinyl polymer/CTAB modified MMT (abbreviated to VP/C-MMT) was applied in the leather making process to examine its tanning properties.
The results of XRD show that the interlayer spacing of the modified MMT is received are 1.40nm and 1.99nm for DMDAAC-MMT and CTAB-MMT respectively, while the d-spacing distance of pristine MMT is only 1.23nm. The composites of DMDAAC modified MMT and VP are phase separated, while CTAB modified MMT formed intercalated nanocomposites with VP.
The application results show, that the shrinkage temperature of leather tanned by VP/C-MMT nano-tannage associated with 2% chrome under optimum process conditions can be raised to 90°C, the strength properties and the water permeability of tanned leather are closely similar to those of a 8% chrome tanned leather, meanwhile, the incrassation rates [thickness increment ratios] are far geater than for the 8% chrome tanned leather. We conclude that the nano tannage is an appropriate application in a reduced-chrome tannage.Note de contenu : - EXPERIMENTAL PROCEDURE : Major chemicals - Synthesis of vinyl polymer - Preparation of modified MMT - Preparation of composites - Application of VP/C-MMT nano tannage - Characterization and measurement
- RESULTS AND DISCUSSIONS : Characterization - Application results -
- Table 1 : Chrome decreased tanning procedure
- Table 2 : Standard chrome tanning procedure
- Table 3 : Shrinkage temperature and thickness increment ratio of the tanned leather
- Table 4 : Physical-mechanical properties of leather sample
- Table 5 : Water permeability of leather sampleEn ligne : https://drive.google.com/file/d/14nXC1S3vof-31cyfIIaJY75R8hkNTgOw/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39227
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 5 (09-10/2005) . - p. 181-185[article]Epoxide tannage : a way forward / R. J. Heath in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 5 (09-10/2005)
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Titre : Epoxide tannage : a way forward Type de document : texte imprimé Auteurs : R. J. Heath, Auteur ; Y. Dy, Auteur ; S. Clara, Auteur ; A. Hudson, Auteur ; H. Manock, Auteur Année de publication : 2005 Article en page(s) : p. 186-193 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Epoxydes
Etudes comparatives
Réticulants -- Produits de remplacement
Solutions aqueuses (chimie) -- Stabilité
Tannage organique
Toxicologie cellulaireIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : An understanding of both the reactive functions of epoxide resins and collagen, suggests that some epoxides could be effectively used in organic tannage systems. Such epoxides may be regarded as alternatives to aldehydic tanning systems, having lower toxicity combined with specific polymerization ability. The commercial and technical potential of epoxides as tanning agents are assessed in this review paper. To this end, an introduction to epoxide chemistry is provided based on the tanning chemist’s viewpoint. The literature survey describes epoxideprotein/collagen addition reaction mechanisms and their kinetics, which in turn are discussed with respect to the potential for future work, where these resins will be utilised in novel tanning technology. The potential risks associated with epoxides and modifications to conventional techniques of tanning, are also discussed. Note de contenu : - EPOXIDE CHEMISTRY : The reactivity of the epoxide group - Commercial liquid epoxide resins - Safety issues related to the use of epoxide resins
- THE ADDITION REACTION OF EPOXY TO COLLAGEN/PROTEIN MATERIALS : Reaction mechanisms - Factors influencing the reaction - The properties of epoxide-treated collagen
- Table 1 : Epoxide stability in aqueous solutions
- Table 2 : Comparison of cytotoxicity of different crosslinkers to L929 CellsEn ligne : https://drive.google.com/file/d/1byXRnTAbtZzAlhBM7X4T1snTPG2HQ0js/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39228
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 5 (09-10/2005) . - p. 186-193[article]The influence of relative humidity on the level of Cr(VI) in level of Cr(VI) in chrome-tanned leather / Yu Congzheng in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 5 (09-10/2005)
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Titre : The influence of relative humidity on the level of Cr(VI) in level of Cr(VI) in chrome-tanned leather Type de document : texte imprimé Auteurs : Yu Congzheng, Auteur ; Liu Pengjie, Auteur ; Sun Genxing, Auteur ; Duan Liming, Auteur ; Ren Huijun, Auteur Année de publication : 2005 Article en page(s) : p. 194-198 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Air -- Humidité
Cuir -- Teneur en chrome hexavalent
Cuirs et peaux -- Analyse
pHIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The influence of relative humidity of the environment on the level of Cr(VI) in chrome-tanned leather was studied. The experiments were carried out as follows : a leather sample was cut into pieces which were stored in different relative humidities followed by determination of Cr(VI). Subsequently, these same pieces were stored at different relative humidities followed by re-determination of the Cr(VI) levels. To confirm the influence of relative humidity, pieces of leather soaked in dichromate solution were dried and then subjected to similar treatment as was given to the earlier leather samples. The results showed that there is a close relationship between the stored humidity and Cr(VI) levels in leather. The higher the relative humidity, the lower the level of Cr(VI) and vice versa. Note de contenu : - EXPERIMENTAL PROCEDURE : Experimental scheme - Determination of the iodine value of the fatliquor (GB5532-85) - Determination of Cr(VI) level in leather according to IU C- 18 standard of the IULTCS - comparing influences of pH value and humidity on chrome (VI) level in leather - Influence of different humidities on the Cr(VI) content in leather - Influence of humidity reversed adjustment on Cr(VI) content in leather - Intensifying treatment of leather samples
- RESULTS AND DISCUSSION : Determination of the iodine value of different fatliquors and the corresponding Cr(VI) contents in leather - Determination of pH values of the stored leathers in different humidities - Cr(VI) content in leather stored at different humidity - Influence of humidity reversed adjustment on Cr(VI) content in leather - Intensifying experiment on different humidity of leathers and different Cr(VI) solutionsEn ligne : https://drive.google.com/file/d/1LnO09Mpg3he-RIIhOwtrlOmyIWRBMVux/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39229
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 5 (09-10/2005) . - p. 194-198[article]Coordinated approach to the production of soft leather / K. Smiechowski in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 5 (09-10/2005)
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Titre : Coordinated approach to the production of soft leather Type de document : texte imprimé Auteurs : K. Smiechowski, Auteur ; K. Beleska, Auteur ; A. Zaliauskiene, Auteur Année de publication : 2005 Article en page(s) : p. 199-203 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chaux
Cuirs et peaux
Epilage
Extraction (chimie)
Granulométrie
Huiles et graisses animales
Mesure
Microscopie
Peaux brutes -- Trempe
Souplesse (mécanique)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Production of soft and strong leather requires a coordinated approach to all chemical and physical processing steps. The composition and nature of the fatliquors is only partly responsible for the leather’s softness. Opening up of the structure, neutralization and tanning influence the fatliquoring process and resulting leather as well.
Knowledge about the changes of the dermal structure during beamhouse processing and its impact on the reaction of fat with leather is necessary for monitoring the fatliquoring process. Two different methods of opening up of the dermal structure - ‘lime-free’ and ‘lime’ - were used in our experiments to determine the relationship between the parameters mentioned above and the fatliquoring effect.Note de contenu : - EXPERIMENTAL PROCEDURES : Unhairing trials - Fatliquoring trials - Evaluation of fatliquoring effect by extraction of fat from leather samples - Measurement of the particle size of fatliquor emulsion - Microscopy
- RESULTS AND DISCUSSIONS :
- Table 1 : Dependence of the removed collagenous and non-collagenous proteins on the method and the duration of treatment
- Table 2 : Data of fatliquor analysis
- Table 3 : Dependence of the amount of extractable and unextractable fats on the method of alkaline treatment and fatliquor propertiesEn ligne : https://drive.google.com/file/d/1LZc2tGKSwpIsdnKzFhJpnqMkcqlyunaY/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39230
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 5 (09-10/2005) . - p. 199-203[article]Aswan clay as sorbent for removal of Cr(III) and Cr(VI) from synthetic solution and tannery wastewater / O. A. Mohamed in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 5 (09-10/2005)
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Titre : Aswan clay as sorbent for removal of Cr(III) and Cr(VI) from synthetic solution and tannery wastewater Type de document : texte imprimé Auteurs : O. A. Mohamed, Auteur ; S. A. Sayed, Auteur ; H. S. Mohamady, Auteur ; N. H. El-Sayed, Auteur Année de publication : 2005 Article en page(s) : p. 204-209 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants
Adsorption
Argile
Caractérisation
Chrome trivalent -- Absorption
Déchets industriels -- Elimination
Eaux usées -- Epuration
Eaux usées -- Teneur en chrome trivalent
Isotherme d'adsorption
Tannage -- DéchetsIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The sorption on Aswan clay of Cr(III) and Cr(VI) from synthetic solution and tannery wastewater has been studied. The clay has been characterized and used for the removal of chrome. The adsorption was studied as a function of pH, contact time, adsorbate concentration, loading, temperature and interfering ions. The equilibrium data fitted well with a Freundlich adsorption isotherm, where the Kf and n values are 2.08 - 4.6 for Cr(VI), 14.45 - 2.5 for Cr(III) and 8.31 - 2.4 for tannery wastewater. In our study we choose Aswan clay, which is low in cost, to aid the economy of the process. Adsorption studies indicated that chrome removal is 77% for CrVI, 90% for CrIII and 75% for a tannery wastewater. Note de contenu : - MATERIALS AND METHODS : Adsorbents
- CHARACTERISTICS OF ASWAN CLAY : X-ray diffraction analysis - Adsorbates - Chemicals - Instrumentation - Methods
- RESULTS AND DISCUSSION : Effect of pH - Effect of agitation time - Effect of adsorbent loading - Effect of adsorbate concentration - Effect of temperature - Effect of some anions on chromium (VI) removal
- ADSORPTION ISOTHERMSEn ligne : https://drive.google.com/file/d/1TtT-yFTYThWUEKw5oSLffFro0XdfeHyr/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39231
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 5 (09-10/2005) . - p. 204-209[article]