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Effect of particle size distribution on the performance of two-component water-reducible acrylic polyurethane coatings using tertiary polyisocyanate crosslinkers / Denise E. Fiori in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 902 (03/2000)
[article]
Titre : Effect of particle size distribution on the performance of two-component water-reducible acrylic polyurethane coatings using tertiary polyisocyanate crosslinkers Type de document : texte imprimé Auteurs : Denise E. Fiori, Auteur ; David Ley, Auteur ; Richard J. Quinn, Auteur Année de publication : 2000 Article en page(s) : p. 63-69 Note générale : Bibliogr. Langues : Américain (ame) Tags : Peinture eau deux constituants Uréthanne polymère Acrylique dérivé Distribution dimension particule Durcissement Réticulant Isocyanate Propriété physique mécanique Feuil Etude expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : A two-component waterborne polyurethane system with a 250 g/l VOC has been formulated to meet the performance requirements of the automotive refinish market. This paper discussed an experimental study to develop a two-component water-reducible polyurethane coating using a tertiary aliphatic polyisocyanete crosslinker with dry times, appearance, and reactivity equivalent to a two-component solventborne system. The effects of acrylic polyol monomer composition, glass transition temperature (Tg), and hydroxyl concentration on drytime and ambient cure film performance have been determined. The effects of particle size distribution of the formulated coating on performance were examined. It was found that smaller particle size provides overall improved film propertics, i.e., jaster dry time, increased hardness, and faster development of solvent resistance. The relationship of both acrylic polyol composition and formulation variables on the particle size distribution are discussed. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5823
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 902 (03/2000) . - p. 63-69[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001207 - Périodique Bibliothèque principale Documentaires Disponible A selective catalyst for two-component waterborne polyurethane coatings / Z. Alex He in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 930 (07/2002)
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Titre : A selective catalyst for two-component waterborne polyurethane coatings Type de document : texte imprimé Auteurs : Z. Alex He, Auteur ; Werner J. Blank, Auteur ; Marie E. Picci, Auteur Année de publication : 2002 Article en page(s) : p. 31-36 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude expérimentale Zirconium Complexe Catalyseur Adjuvant Formulation Peinture eau Uréthanne polymère deux constituants Matériau revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : The potential for formulating low VOC, high performance, two-component waterborne isocyanate crosslinked coatings has generated a great deal of interest. The difficulties in formulating these coatings, however, are significant. A major problem associated with such systems is the isocyanate-water side reaction, which can lead to gassing/foaming, loss of isocyanate functionality, low gloss, and a reduced pot life. To compensate for this side reaction, these formulations usually contain a large excess of isocyanate. One novel approach to control the water side reaction is the use of catalysts which selectively catalyze the isocyanate-polyol reaction and not the isocyanate-water reaction. The selectivity of a variety of metal catalysts to catalyze the preferred reaction was measured using an FTIR method. A zirconium complex has shown unusually high selectivity for the isocyanate-polyol reaction in comparison to the standard dibutyltin dilaurate catalyst. This zirconium complex catalyst has been evaluated in several waterborne polyurethane formulations and has demonstrated less gassing/foaming, longer pot life, and higher gloss than dibutyltin dilaurate at equal cure time. The mechanism of catalysis and formulating techniques of this novel zirconium catalyst will be discussed. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5644
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Code-barres Cote Support Localisation Section Disponibilité 001241 - Périodique Bibliothèque principale Documentaires Disponible Waterborne epoxy protective coatings for metal / F. L. Duivenvoorde in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 931 (08/2002)
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Titre : Waterborne epoxy protective coatings for metal Type de document : texte imprimé Auteurs : F. L. Duivenvoorde, Auteur Année de publication : 2002 Article en page(s) : p. 63-72 Note générale : Bibliogr. Langues : Américain (ame) Tags : Dispersion aqueuse Amidoamine polymère Durcissant Epoxyde résine Formulation Peinture deux constituants eau anticorrosion Revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Recent enhancements in waterborne resin system polymers as well as the way they are formulated have produced paints with a set of barrier properties that are superior to their standard solventborne analogs. New generation waterborne epoxy and curing agent dispersions, and the paints formulated from them, have been introduced with changes from older generation waterbornes. These changes include (1) totally nonionically dispersed paints in place of the older ionically dispersed types, (2) quicker coalescing, mutually soluble epoxy/amine vehicle resins rather than the former slow coalescing, highly branched epoxylamine systems, and (3) utilization of stable, water compatible additives and fillers that complement the nonionic epoxylamine resin vehicles. In this paper, the success of these implemented technology changes is demonstrated by comparing the performance properties of the new generation with an industry standard epoxy/polyamide solventborne paint. This paper presents novel two-com Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5639
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Code-barres Cote Support Localisation Section Disponibilité 001242 - Périodique Bibliothèque principale Documentaires Disponible