| Titre : |
Mechanical stability of alkyd emulsions - Part 2 : influence of alkyd properties |
| Type de document : |
texte imprimé |
| Auteurs : |
G. Östberg, Auteur ; Björn Bergenståhl, Auteur |
| Année de publication : |
1994 |
| Article en page(s) : |
p. 37-41 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Cisaillement (mécanique)
Emulsifiants
Polyalkydes
Revêtements en phase aqueuse:Peinture en phase aqueuse
Rhéologie
Viscosité
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The development of waterborne alkyd paints based on alkyd emulsions has been stimulated by more stringent health and environmental regulations. In addition, alkyd paints may have better performance in some applications compared to other types of waterborne paints such as latex dispersions. One problem that needs to be overcome is the limited colloidal stability of alkyd emulsions. It is important that the emulsions are not destabilized when exposed to shear forces, such as those produced by pumps used in the paint industry. An alkyd emulsion consists of alkyd oil droplets dispersed in water and stabilized by a surface active agent (emulsifier). Part 1 of this series described the influence of emulsion droplet size, type, and concentration of the emulsifier on the shear stability. The present study is an additional investigation of the influence of the alkyd properties on shear stability. Increasing the acid value of the alkyd increases the stability of emulsions stabilized with nonionic emulsifiers. Emulsions made using alkyds with shorter oil lenghts and higher viscosities were less stable to shear compared to alkyds with higher oil lenghts and lower viscosities. |
| Note de contenu : |
- Emulsification
- Determination of droplet size
- Mechanical stability |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18726 |
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 838 (11/1994) . - p. 37-41
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