New high performance two-component wood coatings comprised of a hydroxy functional acrylic emulsion and a water-dispersible polyisocyanate / Sharon Xudong Feng in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 899 (12/1999)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 899 (12/1999) . - p. 51-57 Titre : New high performance two-component wood coatings comprised of a hydroxy functional acrylic emulsion and a water-dispersible polyisocyanate Type de document : texte imprimé Auteurs : Sharon Xudong Feng, Auteur ; Mike Dvorchak, Auteur ; Kevan E. Hudson, Auteur ; Christine Renk, Auteur ; Tammy Morgan, Auteur ; Vic Stanislawczyk, Auteur ; Francine Shuster, Auteur ; Dick Todd, Auteur ; Howard Bender, Auteur ; Jim Papenfuss, Auteur Année de publication : 1999 Article en page(s) : p. 51-57 Note générale : Appendices Langues : Américain (ame) Catégories : Ameublement Bois -- Revêtements Formulation (Génie chimique) Hydroxyle En chimie organique, un hydroxyle (ou oxhydryle) peut désigner deux entités. Un groupement -OH, appelé aussi hydroxy, qui se rencontre en particulier dans les alcools et les phénols. Un radical : HO^{\bullet}. Il est produit par exemple lors de réactions de dissociation de peroxydes, en présence d'ions de métaux de transition (Fe(II), Cu(I), réaction de Fenton), de chauffage ou de rayonnement. Liants Polyacryliques Polyisocyanates Revêtements bi-composant Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Statistical methods were used to develop hydroxy functional acrylic emulsions for use with a water-dispersible polyisocyanate crosslinker. The resulting two-component waterborne coating systems were optimized for kitchen cabinet and office furniture applications. Key performance criteria included appearance and aesthetics pot life, print and mar resistance, and chemical resistance involving both Kitchen Cabinet Manufacturers, Association (KCMA) and office furniture requirements. Statistical analysis revealed several strong correlations between acrylic emulsion hydroxy level, particle size, composition Tg and polymerization process and wood coating performance. For example, smaller acrylic emulsion particle size was found to yield many performance benefits with few detriments. Coating formulation variables were also found to be significant. Ultimate coating hardness increased with water-dispersible polyisocyanate level, yet early hardness readings correlated negatively with water-dispersible polyisocyanate level. Plasticization and crosslinking effects were thought to be responsible. Higher ethylene glycol monbutyl ether (EB) coalescent level was found to correlate negatively with coating hardness, suggesting a reaction between the EB hydroxyl group and the water-dispersible polyisocyanate, resulting in plasticization of the coating. Note de contenu : HFAE POLYMERIZATION VARIABLES : Hydroxyl level - Polymerization process - Composition Tg - Acrylic emulsion particle size - COATING FORMULATION VARIABLES : Level of WDPI - Neutralizing amine - Agitation during the dispersion of the WDPI in the HFAe - Coalescent level - RESULTS AND DISCUSSION : Formulation gel time - WDPI level effect on hardness with dry - coating hardness/appearance - Acrylic emulsion hydroxy level effects - Acrylic emulsion particle size - Acrylic emulsion process - Type of neutralizing amine - Coalescent level Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17947 [article]

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