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Electron beam (EB) curable coatings : an overview / Mhatre Roshni in PAINTINDIA, Vol. LVIII, N° 6 (06/2008)

[article]  inPAINTINDIA > Vol. LVIII, N° 6 (06/2008) . - p. 73-84 Titre : Electron beam (EB) curable coatings : an overview Type de document : texte imprimé Auteurs : Mhatre Roshni, Auteur ; Prakash A. Mahanwar, Auteur Année de publication : 2008 Article en page(s) : p. 73-84 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Pigments Réticulation (polymérisation) Revêtements -- Séchage sous rayonnement électronique Index. décimale : 667.9 Revêtements et enduits Résumé : Over the past 30 years, EB curing has achieved progress in both market growth and technology. Initially environment friendly aspects was the major driving force for ifs growth, today ifs the operation, efficiency and product quality. For the high build pigment coating EB curing is the preferred method. Also EB curable coating contain no solvent, nothing evaporates and hence low VOC allowing coating to be stable in container for a longer time. This paper reviews the electron beam curable surface coating used for coating metal, plastic, wood, optical etc. Note de contenu : - WHY USE RADIATION CURING ? : Advantages/benefits - CURING MECHANISM : Equipment. Electron beam curing unit (EBCU) - COATINGS FORMULATIONS : Oligomer - Polyester acrylate - Urethane acrylate - Epoxy acrylate - Monomers - Additives - DISADVANTAGES/LIMITATIONS - APPLICATION OF EB COATINGS : Metal coating - Wood coating - Plastic coating - Optical coating - Electrical/electronics - Release coatings - Metallising base coats - Safety in EB curing Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12114 [article]

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Environmentally preferred coatings from modified cardanol-based epoxidized novolac resin / Ranjana Yadav in PAINTINDIA, Vol. LVIII, N° 6 (06/2008)

[article]  inPAINTINDIA > Vol. LVIII, N° 6 (06/2008) . - p. 85-100 Titre : Environmentally preferred coatings from modified cardanol-based epoxidized novolac resin Type de document : texte imprimé Auteurs : Ranjana Yadav, Auteur ; Deepak Srivastava, Auteur Année de publication : 2008 Article en page(s) : p. 85-100 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cardanol Chromatographie sur gel Copolymère carboxyle terminé de Butadiène-acrylonitrile Copolymère carboxyle terminé liquide de butadiène Epoxydes Formaldéhyde Fourier, Spectroscopie infrarouge à transformée de Ressources renouvelables Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : Cardanol-based epoxidized novolac resin was modified with different weight ratios of liquid rubbers, viz. carboxyl-terminated polybutadiene (CTPB) and carboxyl-terminated butadiene - acrylonitrile copolymer (CTBN) for its use as environment friendly coating materials. The cardanol-based epoxy resin was synthesized from novolac resin, prepared from cardanol (C) and formaldehyde (F) having C/F molar ratio equals 1:0.6. A tricarboxylic acid such as citric acid was used as a catalyst for the system. The novolac resin was epoxidized with molar excess of epichlorohydrin at 120°C in basic medium. The epoxidized novolac resins were, separately, blended with different weight ratios of different carboxyl-terminated liquid rubbers and ranging between 0-25 w % with an interval of 5 wt%. All the blends were cured at 120°C with stiochiometric amount ofpolyamine. The formation of various products during the synthesis of cardanol-based novolac resin, epoxidized novolac resin and blending of epoxidized novolac resin with different liquid rubber have been studied by Fourier-transform infra-red (FTIR) spectroscopic analysis. The molecular weights of the prepared novolac and their epoxidized novolac resins were determined by gel permeation chromatographic (GPC) analysis. These blend samples were also found to be most thermally stable systems. Note de contenu : EXPERIMENTAL : Materials - Synthesis of cardanol based novolac-type phenolic resin - Preparation of blends of epoxidized novolac resin and different carboxyl-terminated liquid rubbers - Characterization RESULTS AND DISCUSSION : Synthesis of cardanol-formaldehyde novolac type phenolic resin - FTIR and GPC of cardanol-formaldehyde resin - Epoxidation of novolac prepolymer - FTIR analysis of uncured and cured samples - Effect of CTPB and CTBN on cure time of blend samples - Morphological properties - Chemical resistance Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12115 [article]

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Fame technology - A new beginning / Shrilaxmi Ayyar in PAINTINDIA, Vol. LVIII, N° 6 (06/2008)

[article]  inPAINTINDIA > Vol. LVIII, N° 6 (06/2008) . - p. 101-104 Titre : Fame technology - A new beginning Type de document : texte imprimé Auteurs : Shrilaxmi Ayyar, Auteur ; Shraddha Junnarkar, Auteur Année de publication : 2008 Article en page(s) : p. 101-104 Langues : Anglais (eng) Catégories : Ethoxylate d'alkylphénol Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : In the coating industry, especially trade sales and decorative industrial systems, alkylphenol ethoxylates (APEs) are the commonlyused wetting and dispersing agents for pigment and filler stabilization. APEs are non-ionic surfactants with outstanding emulsifying, dispersing, and wetting capacities. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12120 [article]

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Dispersing nanoscaled pigments and fillers / Jochen Winkler in PAINTINDIA, Vol. LVIII, N° 6 (06/2008)

[article]  inPAINTINDIA > Vol. LVIII, N° 6 (06/2008) . - p. 105-118 Titre : Dispersing nanoscaled pigments and fillers Type de document : texte imprimé Auteurs : Jochen Winkler, Auteur Année de publication : 2008 Article en page(s) : p. 105-118 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Charges (matériaux) Dispersions et suspensions Pigments Index. décimale : 667.9 Revêtements et enduits Résumé : Nanoscaled pigments and functional fillers are becoming more and more important as ingredients in paints, plastics and rubbers. These additives can improve material performance dramatically and lead to special effects that are uniquely connected to their presence. Yet, in order to be useful, they normally have to be dispersed down to primary particle sizes. In many cases, this is a difficult task to achieve. The reason is that, as agglomerates become smaller and smaller, they lose inertia and move with the liquid components of the mill base, thus avoiding mechanical stress situations. The paper will deal with the aspects of dispersing in general, distinguishing between the probability for agglomerates to be stressed and the probability for them to break. For the case of bead mills, the connection between the mechanical power input and the degree of dispersion will be demonstrated and concepts for dispersing nanoparticles will be presented. Note de contenu : - Power input and dispersing time - Energy density distribution in the milling chamber - High speed attritor mills (bead mills) - Shear versus impact - Process control mechanical power - Attractive forces between primary particles - Influence of bead size on dispersion results - Small agglomerates avoid stress situations Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12121 [article]

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Nanotechnoloy and coatings Q&A / Vinayak M. Natu in PAINTINDIA, Vol. LVIII, N° 6 (06/2008)

[article]  inPAINTINDIA > Vol. LVIII, N° 6 (06/2008) . - p. 137-142 Titre : Nanotechnoloy and coatings Q&A Type de document : texte imprimé Auteurs : Vinayak M. Natu, Auteur Année de publication : 2008 Article en page(s) : p. 137-142 Langues : Anglais (eng) Catégories : Dispersions et suspensions Nanoparticules Nanotechnologie Index. décimale : 620.5 Nanotechnologies Résumé : What is 'surface chemical potential' and its significance for nanoparticles ? What is "Oswald ripening' and how does it affect the praticle size distribution ? How can nanodispersion of pigments and extenders be achieved by milling technique ? How do nanodispersions compare with micro-dispersions ? What are the principles governing stabilization of nanodispersions ? What are the practical aspects of stabilization of nanodispersions ? Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12122 [article]

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