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JOURNAL OF COATINGS TECHNOLOGY (JCT) . Vol. 66, N° 828Mention de date : 01/1994Paru le : 01/01/1994 |
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Ajouter le résultat dans votre panierGloss of paint films : II. Effects of pigment size / Juergen H. Braun in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 828 (01/1994)
[article]
Titre : Gloss of paint films : II. Effects of pigment size Type de document : texte imprimé Auteurs : Juergen H. Braun, Auteur ; David P. Fields, Auteur Année de publication : 1994 Article en page(s) : p. 93-98 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique)
Couches minces
Dioxyde de titane
Particules (matières)
Pigments inorganiques
Revêtements -- Propriétés optiques:Peinture -- Propriétés optiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : A theory that explains the mechanism by which pigments affect the gloss of paint films was strengthened and expanded. Immediately after paint is applied, surface tension of the wet film maintains its surface at molecular smoothness and gloss at perfect distinctness-of-image. While the film dries or cures it shrinks from loss of solvent or condensation products. Pigment particles and, if present, resin droplets, come together, interact and develop structure within the wet film. Eventually, the compressive strength of this structure in the film overcomes the surface forces. As the film continues to shrink, its surface becomes rough, degrading distinctness-of-image gloss. Experimental data and theoretical argument are presented that show that effects are proportional to pigment particle size. Note de contenu : - THE MECHANISM OF PIGMENT INVOLVEMENT IN GLOSS
- EXPERIMENTAL : TiO2 pigments - Flatting agents - Pigment particle size - Gloss performancePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18752
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 828 (01/1994) . - p. 93-98[article]Novel composite latex particles for use in coatings / Gerald A. Vandezande in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 828 (01/1994)
[article]
Titre : Novel composite latex particles for use in coatings Type de document : texte imprimé Auteurs : Gerald A. Vandezande, Auteur ; Alfred Rudin, Auteur Année de publication : 1994 Article en page(s) : p. 99-108 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Core-Shell
Liants
Polyacétate de vinyle
Polyacrylate de butyle
Polymérisation en émulsion
Revêtements en phase aqueuse:Peinture en phase aqueuseIndex. décimale : 667.9 Revêtements et enduits Résumé : A novel emulsion polymerization technique is described to produce core-shell latex particles comprising poly(vinyl acetate) cores inside vinyl-acrylic shells. In a variation, acrylic shells can be produced surrounding poly(vinyl acetate) or vinyl acrylic cores. The latexes can be produced at commercial solids levels, with controlled, monodisperse particle sizes. The coatings formed from such core-shell particles exhibit the properties expected of the shell polymers. Core monomers are less expensive than the shell monomers, resulting in significant savings in raw material costs. The technique described is an inverted core-shell process in which the second-stage polymer is engulfed by a previously formed first-stage material. In coatings formulations the less expensive second stage monomers are more hydrophilic than those used to make the first stage polymer. Nevertheless, an inverted core-shell morphology can be made thermodynamically stable by appropriate choices of copolymerizable surfactants in the first-stage copolymer and nonionic initiator for the second-stage polymer. The resulting anchoring groups stabilize the desired particle structure. Note de contenu : - INTRODUCTION : Heterogeneous latex production theory - Thermodynamics and kinetics of heterogeneous particle formation - Practical applications of theory - Present study
- EXPERIMENTAL : Latex preparation - Initial latexes - Vinyl acetate/butyl acrylate latex - MMA/butyl acrylate latex - Core-shell latexes - Cores with vinyl acetate/butylacrylates shells - Cores with MMA/butyl acrylate shells - Latex characterizationPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18753
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 828 (01/1994) . - p. 99-108[article]Effect of preweathering, surface roughness, and wood species on the performance of paint and stains / R. Sam Williams in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 828 (01/1994)
[article]
Titre : Effect of preweathering, surface roughness, and wood species on the performance of paint and stains Type de document : texte imprimé Auteurs : R. Sam Williams, Auteur ; William C. Feist, Auteur Année de publication : 1994 Article en page(s) : p. 109-121 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Effets du climat
Bois -- Revêtements protecteurs
Lasures
Revêtements:Peinture
Rugosité
Tests d'efficacité
VernisIndex. décimale : 667.9 Revêtements et enduits Résumé : To quantify the effect of preweathering of new wood surfaces on subsequent finish performance, unfinished wood siding was exposed outdoors for four or eight weeks. Following this preweathering, the specimens were finished with a variety of finishes and placed outdoors again for several years (weathered). The finished specimens were evaluated annually to determine the effect of preweathering on finish performance. The durabilities of 30 different finish systems, consisting of six finishes and five substrates, were evaluated over a five-year period. The wood species were primarily hardwoods and dense softwoods. For these dense species, which weather slowly, a few weeks of preweathering decreased paint performance. The effect of preweathering varied depending on the lenght of time the siding was preweathered, wood species, surface roughness, and finish. The results of the weathering were compared with the results of adhesion testing of similar panels preweathered before finishing. Note de contenu : - RESULTS AND DISCUSSION : Semitransparent stains - Acrylic latex primer and topcoat - Alkyd primer and acrylic latex topcoat - Alkyd primer and topcoat - Solid-color stains - Finish durability - Adhesion tests and durability Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18754
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 828 (01/1994) . - p. 109-121[article]