Formulating water - based systems with propylene - oxide - based glycol ethers / Carmen Rodriguez in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 905 (06/2000)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 905 (06/2000) . - p. 67-72 Titre : Formulating water - based systems with propylene - oxide - based glycol ethers Type de document : texte imprimé Auteurs : Carmen Rodriguez, Auteur ; Julia Weathers, Auteur ; Bernadette Corujo, Auteur ; Patricia Peterson, Auteur Année de publication : 2000 Article en page(s) : p. 67-72 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : To comply with environmental regulations, formulators have reformulated to water-based systems using non-hazardous air pollutants (non-HAP) cosolvents and developed new resin technology. In fully formulated water-based systems, however, changing the solvent system to meet environmental regulations has wide ranging effects on viscosity, surface defects, film shrinkage, adhesion, and durability. Formulators often adjust paint viscosity by balancing the levels of cosolvents, surfactants, and rheology modifiers. Reformulating with non-HAPs solvents such as propylene oxide-based glycol ethers (PG-glycol ethers) helps reduce volatile organic content (VOC) to meet environmental compliance and eliminates HAPs reporting requirements. When replacing ethylene oxide-based glycol ethers (EG-glycol ethers) with their PG-glycol ethers, reformulation seems simple enough, particularly if evaporation rates and solubility parameters are matched. A drop-in replacement, however, requires optimization. This study compares the use of PG-glycol ethers in four architectural latex paints and assesses their effects on rheology, drying, and some key performance attributes. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5803 [article]

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Tert-butyl acetate / Charles Cooper in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 922 (11/2001)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 922 (11/2001) . - p. 19-24 Titre : Tert-butyl acetate : non-HAP solvent for high-solids epoxy formulations Type de document : texte imprimé Auteurs : Charles Cooper, Auteur ; Paul Galick, Auteur ; Stephen Harris, Auteur ; Daniel Pourreau, Auteur ; Carmen Rodriguez, Auteur Année de publication : 2001 Article en page(s) : p. 19-24 Note générale : Bibliogr. Langues : Américain (ame) Tags : Acétique  acide  ester  t-butyle  Prévention  pollution  Solvant  organique  Epoxyde  résine  Formulation  Peinture  haute  teneur  solide  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Xylene is the traditional diluent solvent for formulating epoxy/amine paints used in protective coatings and linings. Currently, it is under regulatory pressure because it is on the hazardous air pollutant (HAP) list and it is also a volatile organic compound (VOC). Ketones and acetate esters are powerful solvents, but their use is limited by their reaction with the amine curatives before paint application. Tert-butyl acetate (t-BAc) proposed as a VOC-exempt solvent, is a nonreactive, non-HAP solvent suitable for both the epoxy resin and amine curative sides of a two-component epoxy system. Molecular modeling predicts very low reactivity of the t-BAc ester functionality with amine nucleophiles as a result of steric hindrance. Long-term aging studies with amine curatives in t-BAc solutions confirm these theoretical results. Kinetics of the reaction of amines with t-BAc and its n-butyl acetate isomer support the view that steric hindrance plays a major role in amine solution stability. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5769 [article]

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