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Catalysis of the epoxy-carboxyl reaction / Werner J. Blank in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 926 (03/2002)
[article]
Titre : Catalysis of the epoxy-carboxyl reaction Type de document : texte imprimé Auteurs : Werner J. Blank, Auteur ; Marie E. Picci, Auteur Année de publication : 2002 Article en page(s) : p. 33-41 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Etude expérimentale' 'Mécanisme réaction' 'Activité catalytique' comparative' 'Catalyse basique' 'Réaction 'Durcissement matière plastique' 'Acrylate copolymère' 'Méthacrylate 'Résine époxyde' Index. décimale : 667.9 Revêtements et enduits Résumé : We have investigated the reactions of glycidyl ether, glycidyl ester, and other oxirane functional resins with carboxyl or anhydride functional compounds and polymers in the presence of a wide range of amine, phosphonium, and metal catalysts.
We confirmed that both amine and phosphonium compounds can catalyze the reaction of epoxy groups with carboxyl and anhydride groups. There are certain deficiencies with these catalysts, such as a tendency to yellow and a reduction in stability at ambient or elevated temperatures. We also observed that many of the known amine catalysts contribute to poorer humidity resistance and exterior durability. Several metal salts were found to be effective catalysts, but they also contributed to a reduction in chemical resistance or they led to paint instability.
We have discovered a group of metal chelates that overcome these problems and provide stable formulations in a single package that do not yellow during cure and that give improved resistance properties. The new catalysts have been evaluated in high-solids epoxy/carboxyl coatings, automotive clearcoats, and powder coatings.Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5670
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 926 (03/2002) . - p. 33-41[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001236 - Périodique Bibliothèque principale Documentaires Disponible 001237 - Périodique Bibliothèque principale Documentaires Disponible Cycloaliphatic epoxide crosslinkable core-Shell latexes / Mark D. Soucek in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 921 (10/2001)
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Titre : Cycloaliphatic epoxide crosslinkable core-Shell latexes : A new strategy for waterborne epoxide coatings Type de document : texte imprimé Auteurs : Mark D. Soucek, Auteur ; Ganghua Teng, Auteur ; Shoabing Wu, Auteur Année de publication : 2001 Article en page(s) : p. 117-125 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Matériau revêtement' 'Peinture phase aqueuse' émulsion' Formulation Liant 'Résine époxyde' 'Polymère réticulé' Latex 'Polyméthacrylate méthyle' 'Polyacrylate butyle' hydroxyéthyle' 'Acide méthacrylique' Préparation 'Etude expérimentale' 'Particule core shell' Index. décimale : 667.9 Revêtements et enduits Résumé : New core-shell acrylic latexes designed for crosslinking with cycloaliphatic diepoxides were prepared. The core consisted of methyl methacrylate (MMA), butyl acrylate (BA), 2-hydroxyethyl methacrylate (HEMA), and the shell MMA, BA, and methacrylic acid (MAA). A strong acid acrylate was incorporated into the shell to catalyze the crosslinking reactions. The diepoxide crosslinker was introduced into the latex formulation via three methods: (1) added with the monomers during the polymerization of the latex, (2) added after the preparation of the latex in an organic solvent, and (3) added as a separate emulsion. The stability of epoxide was shown to be dependent on latex morphology, initiator system, and reaction conditions. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5766
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Code-barres Cote Support Localisation Section Disponibilité 001229 - Périodique Bibliothèque principale Documentaires Disponible Environmental and time dependence of moisture transportation in an epoxy coating and its significance for accelerated weathering / Shi Xiaodong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 4 (07/2010)
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Titre : Environmental and time dependence of moisture transportation in an epoxy coating and its significance for accelerated weathering Type de document : texte imprimé Auteurs : Shi Xiaodong, Auteur ; Brian R. Hinderliter, Auteur ; Stuart G. Croll, Auteur Année de publication : 2010 Article en page(s) : p. 419-430 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes
Revêtements -- Détérioration
Revêtements -- Effets de l'humidité
Revêtements:PeintureTags : 'Revêtement Epoxyde' Détérioration 'Coefficient de diffusion' 'Cycle température' 'Détérioration accélérée' 'Transport eau/humidité' 'Réparation défauts' Index. décimale : 667.9 Revêtements et enduits Résumé : It is increasingly appreciated that water is one of the most important factors in the durability behavior of coatings. The rate of water transportation and the degree of saturation of polymeric coatings depends on exposure history, exposure environment, and the nature of a coating. The focus here is on the time taken for transport of water and the variation it causes in thermal and mechanical properties, which have also been shown previously to have time-dependence that leads to discrepancies between different weathering regimes. This paper studied the effect of moisture on coatings’ mechanical properties and the effect of moisture and temperature on recovery of surface indentation. The reduction of mechanical properties and the increasing rate of surface defect relaxation can be explained in terms of plasticization by water. Recovery of surface defects is related to the appearance and diffusion activity of coatings during exposure. Thermogravimetric analysis showed that the content of moisture in the sample is determined by the ambient humidity, temperature, and the rate of change in these environmental parameters. Diffusion coefficients were determined from the weight change data and an activation energy was obtained via Arrhenius equation. Changes in yellowness, as an example, and signature of chemical degradation, indicated that the cycling period in accelerated weathering may affect the degradation via the amount and distribution of moisture in coatings. Diffusion of moisture is typically slow and limits the possibility of complete drying or saturation in an exposure cycle. Results from the cumulative effect of many cycles will be different depending on the conditions DOI : 10.1007/s11998-009-9209-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9209-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9764
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Code-barres Cote Support Localisation Section Disponibilité 012362 - Périodique Bibliothèque principale Documentaires Disponible Formulation and performance elevation of epoxy urethane coating / S. Syed Azim in PAINTINDIA, Vol. XLIX, N° 4 (04/1999)
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Titre : Formulation and performance elevation of epoxy urethane coating Type de document : texte imprimé Auteurs : S. Syed Azim, Auteur ; P. Jayakrishnan, Auteur ; N. S. Rengaswamy, Auteur Année de publication : 1999 Article en page(s) : p. 115-118 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Matériau revêtement' 'Peinture anticorrosion' Liant 'Résine époxyde' modifié' Polyuréthane Formulation Performance 'Etude expérimentale' Index. décimale : 667.9 Revêtements et enduits Résumé : Aliphatic polyurethane coatings are well known for their extremely good weather resistance. However the cost of the imported raw materials make them for selective use in controlling marine and industrial corrosion of steel structures. In this present study an attempt is made to develop a coating material with good weather resistance as well as corrosion resistance. An epoxy resin cured with different ratios of aliphatic polyisocyanate was evaluated for its weather and corrosion resistance nature by conventional methods. The developed resin system was used to formulate a paint i.e. top coat and its performance was compared with the conventional epoxy polyamide paint and a conventional polyurethane paint. It was concluded that by reacting epoxy resin with aliphatic isocyanate one can get a cost effective, better performing top coat, which can be a good replacement for conventional aliphatic polyurethane topcoats. Note de contenu : - Evaluation of epoxy urethane paint Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12965
in PAINTINDIA > Vol. XLIX, N° 4 (04/1999) . - p. 115-118[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006493 - Périodique Bibliothèque principale Documentaires Disponible Liquid zero VOC coatings from cycloaliphatic epoxies / Robert F. Eaton in EUROPEAN COATINGS JOURNAL (ECJ), N° 9/96 (09/1996)
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Titre : Liquid zero VOC coatings from cycloaliphatic epoxies Type de document : texte imprimé Auteurs : Robert F. Eaton, Auteur ; K. T. Lamb, Auteur Année de publication : 1996 Article en page(s) : p. 612-617 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinture Liant 'Résine époxyde' 'Polymère cyclique' aliphatique' Index. décimale : 667.9 Revêtements et enduits Résumé : Zero VOC, HAPS free coatings formulations can be readily prepared from liquid cycloaliphatic epoxies and narrow polydispersity caprolactone polyols. These formulations can be applied by conventional spray equipment and are a viable liquid alternate to powder coatings. Using conventional liquid spray equipment, the capital investment for the installation of a new powder coating line can be avoided. With modification, these coatings can be diluted with water and thickened with conventional cellulosic thickeners used in waterborne coatings. In this study we will discuss the influence of key formulating variables like epoxy/hydroxyl mole ratio, catalyst concentration, polyol molecular weight and polydispersity on coating properties. Viscosity reduction and sag resistance are also discussed. Note de contenu : - Raw materials
- Coating formulation strategies
- Starting point clear formulation
- Effect of catalyst level and R value (epoxy/hydroxyl/mole ratio) on cure, hardness and impact
- Coil coating conditions
- Epoxy/polyol functionality
- Corrosion resistance
- Water dilution
- Rheology control of water diluted systems
- Lower cure temperatures
- Comparison to powder coatings
- Formulating tipsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11309
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Code-barres Cote Support Localisation Section Disponibilité 002518 - Périodique Bibliothèque principale Documentaires Disponible 002519 - Périodique Bibliothèque principale Documentaires Disponible Novel chlorinated film formers for high performance coatings / S. Bhandari in PAINTINDIA, Vol. XLV, N° 7 (07/1995)
PermalinkStudies on the extraction, modification and applications of CNSL/cardanol based epoxy resin / Ranjana Yadav in PAINTINDIA, Vol. LIX, N° 3 (03/2009)
PermalinkSuperior coatings from cyclohexanone formaldehyde-CNSL-epoxy blends / Vilas D. Athawale in PAINTINDIA, Vol. LI, N° 7 (07/2001)
PermalinkUV radiation curing of surface coatings based on ENR-cycloaliphatic diepoxide-glycidyl methacrylate system by cationic photoinitiators-optimization of process variables through response surface methodology / R. N. Kumar in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 896 (09/1999)
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