Novel multi-phase acrylics / Ivan Tyre in COATINGS TECH, Vol. 9, N° 8 (08/2012)  

[article]  inCOATINGS TECH > Vol. 9, N° 8 (08/2012) . - p. 32-38 Titre : Novel multi-phase acrylics : For high performance coatings Type de document : texte imprimé Auteurs : Ivan Tyre, Auteur ; Terri Carson, Auteur Année de publication : 2012 Article en page(s) : p. 32-38 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Anticorrosion Polyacryliques Polymères en émulsion Polymérisation Résistance au chocs Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : For the past few decades, coatings chemists have been responsible for developing high performance coatings while complying with tightening environmental restrictions, particularly the reduction of volatile organic compound (VOC) content. With the initial restrictions in the early 1990s, a chemist could potentially pull out "extra" solvents such as propylene glycol which enhanced freeze/thaw, flow and leveling, and open time, and reduced the levels of coalescing aids used to lower the minimum film formation temperature (MFFT) of the coating based on very hard polymers with glass transition temperature (Tg) in the 40-60°C range. As restrictions became even tighter, a strategy employed (and, in some cases, a very effective one) was the blending of soft and hard single phase resins. Care had to be taken with this approach, as film formation with two distinct polymer particles of varied size and MFFT did not always impart desired properties. Clear, haze-free films were not guaranteed and block resistance properties were subject to the ration and size of the hard polymer to soft particle. With the advent of computer-controlled reaction vessels, the production of multi-phase particles that have both a soft segment for film formation at lower VOC, along with improved elasticity, and a harder portion for property enhancements such as block and dirt pick-up resistance, is possible. This article does not intend describes the fine details of manufacturing these resins, but presents a simplified schematic view along with a description of possible morphologies. Note de contenu : - Polymerization scheme and morphology - Formulating guidelines with multi-phase dispersions - Benchmarking studies of single phase versus multi-phase emulsions in coatings applications : Efflorescence resistance - Wood primer applications (direct-to-metal applications - block resistance - corrosion resistance - gloss retention - impact resistance/flexibility - Tape pull adhesion method B (crosshatch version) En ligne : https://drive.google.com/file/d/1Mdamlv30MGKEAh_b_l3uYb0hbKY8MtMk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15753 [article]

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