Application of titanium metal oxide nanoparticles for leather coating / Sivaraj Sudhahar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 3 (03/2013)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 3 (03/2013) . - p. 108-114 Titre : Application of titanium metal oxide nanoparticles for leather coating Type de document : texte imprimé Auteurs : Sivaraj Sudhahar, Auteur ; Chandrasekaran Sivaraj, Auteur ; Sanjeev Gupta, Auteur Année de publication : 2013 Article en page(s) : p. 108-114 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Cuirs et peaux -- Finition Cuirs et peaux -- Propriétés mécaniques Dioxyde de titane Flexion (mécanique) Nanoparticules -- Synthèse Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather finishing is a very important operation in leather manufacture. Various chemicals are used in leather finishing. The introduction of nanoparticles in leather finishing has revolutionized the leather industry. They are used to produce various types of leathers and to meet the end user requirements. The aim of the work was to coalesce the fields of leather technology and nanotechnology for obtaining superior quality of leather with improved performance. Synthesis of titanium metal oxide nanoparticles was done by sol-gel process and used in leather finishing mixture as coating ingredients. The physical and chemical properties of the synthesized metal oxide nanoparticles were characterized by TEM, FE-SEM, EDAX, FT-IR and XRD. The surface morphology of the nanoparticle coated leather was evaluated by AFM. The finished leather was assessed for its film adhesion to evaluate the strength of the bonding between the leather surfaces and finish coating. The conventional finish system experience finish adhesion issue in due course of time. The titanium metal oxide nanoparticles coated leather exhibited increased adhesion property. TiO2 nanoparticles increased the intermolecular linkages between the leather finish coating and the leather surface. Note de contenu : EXPERIMENTAL : - Materials - Synthesis of titanium metal oxide nanoparticles - Preparation of conventional base coat finish formulation, incorporating TiO2 nanoparticles, for shoe upper leather - Topcoat formulation RESULTS AND DISCUSSION : - Structural and morphological characterization of TiO2 nanoparticles : Wide angle-X-ray diffraction spectroscopy (XRD) analysis - Field emission scanning electron microscope imaging and energy dispersive analysis - EDAX peaks of nano TiO2 powders - Elemental composition analysis - Atomic force microscope image analysis of TiO2 nanoparticles coated leather sample - Determination of applied physical properties for TiO2 nanoparticles coated leather : Flexing endurance - Measurement of finish adhesion - Performance test result for the TiO2 nanoparticles coated leather - Subjective evaluation result for TiO2 nanoparticles coated leather En ligne : https://drive.google.com/file/d/1xDzBGkFHk6szR7eYW0Nq0hRMmibNUFpW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17733 [article]

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Carbonization region measurement in vegetable tanned goat leather using machine vision system for evaluating performance measures of leather cut contour edges / S. Vasanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 2 (02/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 2 (02/2022) . - p. 54-61 Titre : Carbonization region measurement in vegetable tanned goat leather using machine vision system for evaluating performance measures of leather cut contour edges Type de document : texte imprimé Auteurs : S. Vasanth, Auteur ; T. Muthuramalingam, Auteur ; Sanjeev Gupta, Auteur Année de publication : 2022 Article en page(s) : p. 54-61 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbonisation Coupe Cuirs et peaux de chèvres Diodes lasers Imagerie (technique) Mesure Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Due to the widespread application and popularity of lasers in recent times, the usage of laser cutting for leather applications has increased as well. Laser technology is needed to provide more consistent and effective results while cutting leathers that include complicated geometries particularly in several sectors where leathers are often utilized such as footwear, apparel and fashion accessories. In this investigation, the diode laser was preferred for leather cutting due to its regulated power density, compact size and portability whereas the CO2 lasers are uncontrollable. The benefit of employing a diode laser is that it can overcome some of the disadvantages associated with CO2 lasers such as power consumption, carbonization layer and geometric inaccuracy. There is no technique available to measure the carbonization at the leather cut contour edges. Hence an attempt has been made to investigate the carbonization percentage with the help of a machine vision system to improve the machining process. The technique of measuring carbonization can be used effectively in the leather industry for the accurate measurement of carbonization. The lower duty cycle with moderate pulse width modulation (PWM) and amplitude could produce lower carbonization layer. PWM frequency has a high influential role on determining carbonization in leather cutting. Note de contenu : - INTRODUCTION : Experimental methodology - Machine vision module arrangement - Enchancement of acquired images - Conversion of color image to binary image - Design layout in diode based LBM - RESULTS AND DISCUSSION : Calibration of USB digital microscope - Image processing of the specimens - Programming techniques on the measurement - Effects of process parameters on carbonization - Table 1 : Input process variables - Table 2 : Design layout in power diode based LBM - Table 3 : Measurement of carbonization percentage DOI : https://doi.org/10.34314/jalca.v117i2.4728 En ligne : https://drive.google.com/file/d/19QC2Z_9DCQq4uh6YzEE6DMHJdKs0bJFL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37166 [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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Preparation, characterization and application of silica metal oxide nanoparticles for leather coating / Sivaraj Sudhahar 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. 249-255 Titre : Preparation, characterization and application of silica metal oxide nanoparticles for leather coating Type de document : texte imprimé Auteurs : Sivaraj Sudhahar, Auteur ; Chandrasekaran Sivaraj, Auteur ; Sanjeev Gupta, Auteur Année de publication : 2012 Article en page(s) : p. 249-255 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Cuirs et peaux -- Finition Dioxyde de silicium Nanoparticules -- Synthèse Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Sol-gel, Procédé Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Synthesis of silica sol-gel nanoparticles was carried out by the Stober’s process and the resulting products were used in leather finishing mixtures as a coating ingredient. The physical and chemical properties of the synthesized sol-gel nanoparticles were characterized by TEM, FE-SEM, EDAX, FT-IR, TGA and XRD. The surface morphology of the nanoparticle coated leathers were evaluated by AFM. The silica sol-gel nanoparticles-coated leather exhibited improved water spotting resistance, water vapor permeability, and increased adhesion values. Therefore, a conventional system of leather finishing has been upgraded by using silica sol-gel nanoparticles, especially in the base coat application. Note de contenu : - INTRODUCTION : Materials - Synthesis of silica sol-gel nanoparticles - Preparation of conventional base coat finish formulation, incorporating silica sol-gel nanoparticles, for shoe upper leather - Top coat formulation for silica sol-gel nanoparticles applied leather - RESULTS AND DISCUSSION : Structural and morphological characterization of silica sol-gel nanoparticles. Field emission scanning electron microscope imaging and energy dispersive analysis - Edax peaks of nano SiO2, powder - Elemental composition analysis - Determination of applied physical properties for silica sol-gel nanoparticles coated leather - Wet and dry rub analysis - Measurement of lastometer - Water spotting resistance - Measurement of water vapour permeability - Measurement of finish adhesion - Subjective evaluation result for silica sol-gel nanoparticles coated leather En ligne : https://drive.google.com/file/d/1yubC3ga22nLwuxyQqMDtKU-C-dvukK0h/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15645 [article]

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Water-based anionic sulfonated melamine formaldehyde condensate oligomer as retanning agent for leather processing / S. N. Jaisankar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 9 (09/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 9 (09/2010) . - p. 289-296 Titre : Water-based anionic sulfonated melamine formaldehyde condensate oligomer as retanning agent for leather processing Type de document : texte imprimé Auteurs : S. N. Jaisankar, Auteur ; Sanjeev Gupta, Auteur ; Y. Lakshminarayana, Auteur ; J. Kanakaraj, Auteur ; Asit Baran Mandal, Auteur Année de publication : 2010 Article en page(s) : p. 289-296 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This work deals with the synthesis of water-based anionic sulfonated melamine-formaldehyde condensate (SMFC) with very low free formaldehyde content by sequential formulation. The structure of the oligomeric SMFC has been confirmed using spectroscopic methods like FTIR and UV. Molecular weight of the condensates was determined by Gel permeation chromatography (GPC). These oligomers were then evaluated as retanning agents. Chrome tanned wet blue leathers were treated with SMFC in different proportions (1, 2 and 3% based on shaved weight) to optimize the use of the product for physical properties of leather including fullness and dye uptake. Further, the leathers were subjected to conventional dyeing and fatliquoring processes. Control experiments without SMFC were also undertaken to judge the efficacy of the product. The results showed that SMFC treated leather exhibited improved grain tightness, softness, fullness and dye uptake in the resultant leather. The most important aspect of the product was very low (<10 ppm) free formaldehyde content in the treated leather. En ligne : https://drive.google.com/file/d/1XpVC-h9MTVrHOFsUJZP86n_uBKqA-x0K/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10507 [article]

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Zinc oxide (Zno) nanoparticles for enhancement of fastness properties in cationic finishing / RamKumar Kothandam in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 5 (05/2017)  

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