Micro particle to nano particle - the technology of tomorrow / Debabrata Pal in PAINTINDIA, Vol. LVII, N° 1 (01/2007)  

[article]  inPAINTINDIA > Vol. LVII, N° 1 (01/2007) . - p. 87-108 Titre : Micro particle to nano particle - the technology of tomorrow Type de document : texte imprimé Auteurs : Debabrata Pal, Auteur Année de publication : 2007 Article en page(s) : p. 87-108 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Nanotechnologie Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : Nano technology is more than a process that simply miniaturizes micro-technology. "Nano" stands for a promising form of basic and interdisciplinary technologies. It combines physical technologies, chemical materials sciences and biological principles with application-driven engineering. Scientists take molecular-theoretical ideas and use them as concepts for functional nanostructures that can be manufactured through the selective manipulation of molecules and atoms. The innovative potential for new materials, which make new applications possible while lowering materials costs, turns nanotechnology into an interdisciplinary technology of the future. The paint industries are exploring the potential uses of this technology in research with the ultimate objective of creating superior nano based paints. Note de contenu : Nano technology - Unique properties at nanoscale - Nano particles - Particle having 3D in nm range - Particles having 2D in nm range - Particles having 1D in nm range - layered silicates - Structures : phyllosilicates - Nano technology in coatings - Nano structured coatings - Synthesis - Particle size distribution - High temperature curing of acrylic lacquers Conclusions : Corrosion resistance coating by nanotechnology Coating from particulate sol - Principle of electrophoretic deposition (EPD) of nano-scaled silica - Nano particles with improved functions - Nano paints that changes color like a chameleon - The vast potential of nano technology in automobile industry, future scope - Learning from lotus - Paint as a source of power - Nano scale anti reflection coating on flat glass - Application - Benefits to users - Issues needing further considerations En ligne : https://drive.google.com/file/d/1pKDXFTi7MojOqXu561xDpxx4qtlqHJr5/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11457 [article]

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Silane modified hyperbranched alkyd for high performance polyurethane coating on multi-substrate / Tirthankar Jana in PAINTINDIA, Vol. LXX, N° 1 (01/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 1 (01/2020) . - p. 55-66 Titre : Silane modified hyperbranched alkyd for high performance polyurethane coating on multi-substrate Type de document : texte imprimé Auteurs : Tirthankar Jana, Auteur ; Debabrata Pal, Auteur ; Rantu Bhunia, Auteur Année de publication : 2020 Article en page(s) : p. 55-66 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Anticorrosifs Anticorrosion Application directe sur le métal Polymères ramifiés Polyuréthanes Réaction de couplage Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : The coating on metal substrate enhances protection against corrosion and aesthetic value. Generally multi coat system is followed to perform these requirements. To reduce the painting cost, painting cycle as well as volatile organic compound emission, high solid coating in single coat is most promising. Use of hyperbranched alkyd is a suitable approach for this purpose as it form high solid, high build up in a single coat, better levelling and adhesion on any substrates. In the present study, to achieve adhesion on multi substrate, different silane coupled hyperbranched alkyd polyurethane have been synthesised and characterised through different analytical techniques. The coating based on silane modified hyperbranched polymer exhibited excellent anti corrosive performance, adhesion on multi substrate and initial gloss and gloss retention under accelerated weathering. Such silane modified hyperbranched polyurethane coating has potential for application in direct to metal (DTM) coating. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of hyperbranched alkyd - Formulation of coatings and film preparation - CHARACTERIZATION : Characterization of resins - ACCELERATED WEATHERING TEST - CORROSION RESISTANCE TEST - RESULTS AND DISCUSSION : FTIR spectroscopy - DSC analysis - Physical properties of resin - Scratch resistance, flexibility, abrasion resistance, pendulum hardness & impact resistance - Adhesion strength - ACCELERATED WEATHERING TEST : Corrosion resistance i.e. salt spray and humidity resistance performance - Fig. 1 : Scheme of the synthesis of hyperbranched core - Fig. 2 : Scheme of the synthesis of silan modified hyperbranched alkyd - Fig. 3 : FTIR Spectrum of different silane modified hyperbranched alkyd. (A) unmodified hyperbranched alkyd, (B) amino silane, (C) thio silane and (D) epoxy silane modified hyperbranched alkyd - Fig. 4 : DSC Thermogram of different alkyd polyurethane coatings using alkyd A, B, C and D respectively - Fig. 5 : Pull of adhesion strength of different alkyd polyurethane (PU) coating system - Fig. 6 : Adhesion test results on different test panels - Fig. 7 : QUV gloss retention of different alkyd polyurethand system at different intervals - Fig. 8 : ΔE value of different alkyd polyurethane coating after 500 hrs of QUV exposure - Fig. 9 : Images of test panels after salt spray exposure of 500 hrs - Fig. 10 : Images of test panels after humidity test of 500 hrs - Table 1 : Physical characteristics of four different alkyds - Table 2 : Physical and mechanical properties of alkyd polyurethane coatings En ligne : https://drive.google.com/file/d/1kF7R7QvsT07K6t9anJ4rwtetmtIE6gzp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34679 [article]

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Silica encapsulated tannic acid containing pH triggered smart coating / Debabrata Pal in PAINTINDIA, Vol. LXIX, N° 6 (06/2019)  

[article]  inPAINTINDIA > Vol. LXIX, N° 6 (06/2019) . - p. 55-64 Titre : Silica encapsulated tannic acid containing pH triggered smart coating Type de document : texte imprimé Auteurs : Debabrata Pal, Auteur ; Pradipta Sankar Maiti, Auteur ; Kumaresh Nandy, Auteur ; Saumyadip Ghosh, Auteur Année de publication : 2019 Article en page(s) : p. 55-64 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs Anticorrosion Encapsulation Essais de brouillard salin Matériaux intelligents Métaux -- Revêtements protecteurs pH Primaire (revêtement) Revêtements bi-composant Tanins Index. décimale : 667.9 Revêtements et enduits Résumé : The annual cost of corrosion globally exceeds 1.8 trillion US dollars, which translates into 3-4 % of the GDP of industrialised nations worldwide. Over the past decade there has been significant progress in the development of smart coatings. Smart coatings require triggers to respond to the environment. Such triggers can be moisture, pH, chloride ions concentration, mechanical damage, and temperature and redox activity. In the current work we report synthesis of silica encapsulated tannic acid based smart coatings and its rust preventive performance derived out of the same. Epoxy primer grey paint and epoxy novolac based tank liner paints prepared using silica encapsulated tannic acid (MNSTA) were applied over manually cleaned surface. Its triggering mechanism was analysed by exposing them to different acidic pH and subsequently exposed to salt spray testing. The same has been compared with normal salt spray behaviour. Pull off adhesion, cathodic disbondment were performed in addition to understand its overall anti-corrosive behaviour. Note de contenu : - EXPERIMENTAL METHODOLOGY : Reagents - Preparation of silica encapsulated tannic acid - PAINT PREPARATION : A) Two pack zinc phosphate primer - B) Epoxy novolac based tank liner system - TEST MEDHODS USED : pH triggering procedure - Pull off adhesion - Cathodic disbondment resistance - RESULTS AND DISCUSSION : Rust prevention property against different pH - Salt spray results - Pull off adhesion results - Cathodic disbondment results En ligne : https://drive.google.com/file/d/1kzE0s4IuKsFTNIBY5xTHWKisf8k5vGiH/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32803 [article]

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