[article]
| Titre : |
New advances in waterborne fluoropolymer technology : A water-based dispersion for industrial coatings formulations |
| Type de document : |
texte imprimé |
| Auteurs : |
Naoko Sumi, Auteur ; Robert Parker, Auteur ; Takashige Maekawa, Auteur ; Masakazu Ataku, Auteur ; Isao Kimura, Auteur |
| Année de publication : |
2009 |
| Article en page(s) : |
p. 24-28 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Dispersions et suspensions
Fluoropolymères
Formulation (Génie chimique)
Polymérisation
Revêtements en phase aqueuse:Peinture en phase aqueuse
Revêtements:Peinture
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Fluorolefin vinyl ether (FEVE) copolymers are well known as ultra-weatherable resins for the coatings industry. Due to increasing environmental regulation of solvents, traditional solvent-based resins have been supplemented by the development of water-based FEVE emulsions. However, the performance of coatings based on these emulsions in lower than that of coatings from solvent-based resin. A class of FEVE water dispersions has been developed recently which offers excellent performance, equivalent to that obtained from solventborne FEVE resins. To make the dispersions, equimolar amounts of chlorotrifluoroethylene and a variety of functionalized vinyl ethers were polymerized. A portion of the hydroxy functional vinyl ether groups was denatured to for carboxylic acid groups, which were neutralized with an amine. The resulting polymeric carboxylate was dispersed in water. Lastly, solvent was evaporated, yielding a FEVE dispersion containing no solvents or emulsifiers. Stable dispersions were synthesized by adjusting parameters such as acid values and molecular weight. The resulting water dispersions were then crosslinked with water dispersible isocyanates. Pigmented coatings based on these dispersions had weatherability, durability, gloss, and water resistance comparable to solvent-based fluorourethane coatings. This articles discusses the preparation of FEVE resin dispersions and properties of the resulting fluorourethane coatings along with a comparison of their properties with those obtained from conventional solvent-based FEVE resins and FEVE aqueous emulsions. |
| En ligne : |
https://drive.google.com/file/d/1-ryw9qn6MWlFMsakE78rQP-FuyrxjBzo/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4039 |
in COATINGS TECH > Vol. 6, N° 2 (02/2009) . - p. 24-28
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