Effect of specific additives on the degree of sulfonation and its influence on leather fatliquoring / R. Janardhanan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 9 (09/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 9 (09/2012) . - p. 279-285 Titre : Effect of specific additives on the degree of sulfonation and its influence on leather fatliquoring Type de document : texte imprimé Auteurs : R. Janardhanan, Auteur ; V. Vijayabaskar, Auteur ; B. S. R. Reddy, Auteur Année de publication : 2012 Article en page(s) : p. 279-285 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Additifs Catalyse par transfert de phase Cuirs et peaux Emulsifiants Mouillage (chimie des surfaces) Potentiel zeta Produits de nourriture du cuir Sulfonation Sulfosuccinates Surfactants Tension superficielle Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Sulfosuccinate type anionic surfactants are classical ingredients for industrial applications. They are of great interest because of their excellent surfactant properties. Fatliquors prepared from sulfosuccinates have been effectively utilized in the leather industry, where the degree of sulfonation of the surfactant plays a crucial role in deciding performance. This paper reports on the study of factors such as the addition of phase transfer catalyst, non-ionic wetting emulsifier and co-solvent on the degree of sulfonation. Emusification power, zeta potential, surface tension and particle size were measured. Reaction conditions were optimized, based on the results. Fatliquors were prepared using different sulfosuccinates and applied on leather. The properties of resultant leathers were studied qualitatively and quantitatively, and SEM studies were carried out for the treated leathers. This work provides a basis for the development of better fatliquoring agents. Note de contenu : - MATERIALS AND METHODS : Materials - Control batch - Experiment 1 (E1 - Addition 5% phase transfer catalyst) - Experiment 2 (E2 - Addition 5% non-ionic emulsifier) - Experiment 3 (E3 - Addition 5% co-solvent) - Application on leather - Characterisation methods - PROPERTIES OF RESULTANT LEATHER - SEM STUDIES - DISCUSSION : Sulfonate content of the surfactants - Effect of co-solvent - Effect of emulsifier - Effect of phase transfer catalyst - Properties of sulfosuccinates - Properties of resultant leathers En ligne : https://drive.google.com/file/d/1fV7HN44YCVqzM67LrDl2HHYBnbANX-r3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16058 [article]

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Hight exhaust chrome tanning using novel copolymer for eco-friendly leather processing / James Kanagaraj in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 1 (01/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 1 (01/2008) . - p. 36 - 43 Titre : Hight exhaust chrome tanning using novel copolymer for eco-friendly leather processing Type de document : texte imprimé Auteurs : James Kanagaraj, Auteur ; B. S. R. Reddy, Auteur ; Geetha Baskar, Auteur ; Sanjeev Gupta, Auteur Année de publication : 2008 Article en page(s) : p. 36 - 43 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The novel nanoparticle dispersion (NPD) of a high molecular weight copolymer in aqueous medium was investigated for its application as an aid to chrome exhaustion. The copolymer chain is made up of two types of monomers, viz. an acrylic ester and an amino acid derivative. The copolymer was synthesized using microemulsion polymerization methods. The monomer from the amino acid derivative provides conditions for microemulsion polymerization reaction in aqueous medium and facilitates formation of NPD of the copolymer in water. The developed NPD exhibits narrow particle size distribution with particle size at 40nm. The NPD is a free flowing liquid with flow characteristics almost similar to water, as shown from its low relative viscosity of 1.08 at 25°C. The zeta potential of NPD at -32.9mV demonstrates anionic nature of the copolymer particle and this may be provided from amino acid derived monomer. The NPD was tested in chrome tanning as an exhaustion aid. The NPD was used in chrome tanning experiment in the pilot level scale and the exhaustion and leather properties were found. From elaborate investigations, it is demonstrated that NPD could perform as a high exhaust chrome aid to provide 94% exhaustion of chromium when used during chrome tanning operation. The effect of NPD on the physiochemical characteristics of leather is presented. En ligne : https://drive.google.com/file/d/1Jsw2q2a8-noWYzkjNDEcDa2ZG8hJdC4k/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2583 [article]

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Performance of sulfonated dimeric malenised soya fatty acid as a leather fatliquor / R. Janardhanan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 4 (04/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 4 (04/2012) . - p. 128-136 Titre : Performance of sulfonated dimeric malenised soya fatty acid as a leather fatliquor Type de document : texte imprimé Auteurs : R. Janardhanan, Auteur ; V. Vijayabaskar, Auteur ; B. S. R. Reddy, Auteur Année de publication : 2012 Article en page(s) : p. 128-136 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acides gras Cuirs et peaux -- Conservation Dimères Energie de surface Huile de soja Potentiel zeta Sulfoniques, Acides Surfactants Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A change of molecular structure improves the surface active efficiency of new generation gemini surfactants. As a result, it was confirmed that the dosage could be reduced considerably in industrial applications as performance chemicals, leading to economically quantifiable benefits. The performance of newly synthesized gemini surfactant based sulfonated dimeric malenised soya fatty acid bridged with butane diol was evaluated as a leather fatliquor. The chemical parameters of the fatliquors were analysed and tested on leather. The properties imparted by the fatliquor to leather were studied qualitatively and quantitatively. SEM studies of the treated leathers revealed better penetration of the gemini surfactant based fatliquor compared to the control. Results were correlated in terms of emulsification power, zeta potential and particle size of the surfactants, found to be better than the conventional surfactant. The surface energy was calculated for the fatliquors and found to be equal. Note de contenu : - MATERIALS AND METHODS : Formulation of fatliquors - Synthesis of sulphonated gemini surfactants - RESULTS AND DISCUSSION : Chemical analyses of FL R, FL 1 and FL 2 fatliquors - Leather properties - TABLE I : Leather fatliquor process - Zeta potential - Surface energy - Particle size - TABLE II : Organoleptic properties of FL 1/FLR and FL 2/FLR - TABLE III : Physical testing results of FL 1/FLR and FL 2/FLR - TABLE IV : Emulsification power of surfactants En ligne : https://drive.google.com/file/d/1Ob8iE3Nbow8V7itSIGGo6-CwBWMiqkjs/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14687 [article]

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Preparation of a new itaconate based amphoteric surfactant for fatliquor applications / R. Janardhanan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 7 (07/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 7 (07/2012) . - p. 231-242 Titre : Preparation of a new itaconate based amphoteric surfactant for fatliquor applications Type de document : texte imprimé Auteurs : R. Janardhanan, Auteur ; V. Vijayabaskar, Auteur ; B. S. R. Reddy, Auteur Année de publication : 2012 Article en page(s) : p. 231-242 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Produits de nourriture du cuir Surfactants Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Amphoteric surfactant based fatliquors are outstanding performers in the leather industry because of their excellent surfactant properties, low toxicity, good biodegradability, excellent resistance to hard water, antistatic properties, good emulsification, dispersion and compatibility with other agents. This paper reports on the preparation of a new amphoteric surfactant, diethylamino-lauryl itaconate (DEALI) through the synthesis of lauryl itaconate (LI) based anionic polymerisable surfactant (“Surfmer”). DEALI and LI were characterized by FT-IR and 1H NMR spectra. Properties of both DEALI and LI such as surface tension at different concentrations, critical micelle concentration, contact angle, surface energy, emulsification power, zeta potential and particle sizes were measured. The Isoelectric Point (IEP) of DEALI was determined. The amphoteric surfactant (DEALI) and the anionic surfactant (LI) were formulated as fatliquors and applied on wet blue cow leather, against each other. Fatliquor imparted properties on the leather were measured qualitatively and quantitatively. Scanning Electron Microscopic studies of the resultant leather was carried out and found to have better performance due to deeper penetration of the amphoteric surfactant. This work provides a lead for the development of new and better fatliquoring agents. Note de contenu : - EXPERIMENTAL : Materials - Experimental methods - Characterization methods - RESULTS AND DISCUSSION : Analytical characterization of surfactants - FTIR characterization - H NMR characterization - Surfactants properties - Analytical characterization of fatliquors - Resultant leather properties En ligne : https://drive.google.com/file/d/1mabHNvYRigD57XdwwziOvbimjetqqoN2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15643 [article]

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