[article]
| Titre : |
Multifunctional, gemini-type coalescing surfactants enable formulation of lower VOC waterborne coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Ernie C. Galgoci, Auteur ; Steven Y. Chan, Auteur ; Kenneth A. Yoxheimer, Auteur ; Roger Reinartz, Auteur ; Virendra V. Shah, Auteur ; Khalil Yacoub, Auteur |
| Année de publication : |
2006 |
| Article en page(s) : |
p. 34-42 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Increasingly, surfactants with multifunctional performance benefits are desired to not only lower the surface tension of waterborne formulations, but also to reduce foam. Low HLB, nonionic Gemini-type surfactants are commonly utilized for this reason. As legislation has required coatings with increasingly lower volatile organic compounds (VOCs) and, consequently, lower coalescent levels, the ability of Gemini surfactants to reduce the minimum film formation temperature (MFFT) of emulsion polymers has garnered interest as a means to enable formulation of lower VOC coatings. This article describes the MFFT reduction imparted by Gemini-type surfactants for a wide variety of emulsion polymers. Atomic force microscopy (AFM) showed that films prepared using an alkyl ester (AE) surfactant were generally smoother than films not containing the AE surfactant. While enabling low-VOC formulating, these surfactants were found to have minimal effect on coating performance. Lower HLB surfactants were found to be the most effective coalescents. A simple model whereby these surfactants preferentially adsorb onto the surface of the polymer particles is introduced to explain their efficiency. |
| En ligne : |
https://drive.google.com/file/d/1-gveKkWu2e9yAbg6qVKfAw3AkMLU-nHY/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5493 |
in COATINGS TECH > Vol. 3, N° 1 (01/2006) . - p. 34-42
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