High-solids alkyds resins with improved properties based on styrene allyl alcohol (SAA) resinous polyols / Daniel B. Pourreau in COATINGS TECH, Vol. 1, N° 2 (02/2004)  

[article]  inCOATINGS TECH > Vol. 1, N° 2 (02/2004) . - p. 40-47 Titre : High-solids alkyds resins with improved properties based on styrene allyl alcohol (SAA) resinous polyols Type de document : texte imprimé Auteurs : Daniel B. Pourreau, Auteur ; Scott E. Smyth, Auteur Année de publication : 2004 Article en page(s) : p. 40-47 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alcool styrène allylique Haut extrait sec Polyalkydes Polyols Réduction des composés organiques volatils Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Stringent VOC content rules on Architectural and Industrial Maintenance (AIM) coatings have recently been enacted by federal, regional, and state regulatory agencies. These new rules effectively ban the use of low-solids solventborne alkyd resins, despite their excellent properties, ease of use, and low cost. In response to these new regulations, alkyd producers have been developing higher solids and waterborne alkyds, but these new resins do not perform as well and are more costly than the higher VOC versions. High solids alkyd resins typically have lower molecular weights, which can increase their drying times and reduce their durability. Waterborne alkyds are usually more expensive, despite having lower solids contents. Their dry time is also affected by temperature and humidity and their storage stability is usually lower than solution alkyds. These properties make waterborne alkyds less attractive to contractors who require paints with fast dry times and high coverage and hiding power for maximum productivity. This paper describes the use of commercial resinous polyols to produce alkyd resins with lower solvent demand, plus improved dry times, humidity and UV resistance compared to conventional medium- and long-oil alkyds. Partial replacement of pentaerythritol with styrene allyl alcohol (SAA) resinous polyols in standard alkyd resin syntheses results in a marked decrease in the resin polydispersities but little change in the number average molecular weights. Tire SAA polyol can be added to the process as a solid or a liquid, oil-modified polyol. The alkyd resin with the best overall properties was obtained by replacing a portion of the pentaerythritol, soybean oil, and phthalic anhydride with an SAA-modified soy polyol. Note de contenu : - INTRODUCTION : Styrene allyl alcohol copolymers use in alkyds - EXPERIMENTAL : Raw materials - Preparation of SAA oleates - Examples preparation of SAA alkyds - Preparation of pigmented alkyds coatings - RESULTS AND DSICUSSION : Long-oil alkyd resin composition, molecular weight, and polydispersity - SAA oleates - Long-oil alkyd coating properties - Table 1 : National, regional, and state VOC content rules for major architectural and industrial maintenance coating categories - Table 2 : Effect of low-VOC alkyd strategies on coating performance - Table 3 : Properties of commercial styrene allyl alcohol co-polymers - Table 4 : Low-viscosity long-oil alkyds based on SAA polyols - Table 5 : Composition and physical properties of SAA-100 oleates En ligne : https://drive.google.com/file/d/1NY0K6-uuc77TYku-i9lL_S9hFR3Gt_Bd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5558 [article]

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