| Titre : |
Low foaming surfactant systems for industrial applications |
| Type de document : |
texte imprimé |
| Auteurs : |
B. Jakobs, Auteur ; B. Breitzke, Auteur ; M. Stolz, Auteur ; R. Verzellino, Auteur |
| Année de publication : |
2005 |
| Article en page(s) : |
p. 63-68 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Alcoxylates
Détergents
Diagrammes de phases
Mouillage (chimie des surfaces)
Mousse (chimie)
Surfactants
|
| Index. décimale : |
668.1 Agents tensioactifs : savons, détergents |
| Résumé : |
In many applications the surfactant system has to meet contradicting physical requirements. The surfactants should provide not only excellent cleaning performance but additionally exhibit low foaming properties. However, the same physical parameters that need to be adjusted to ensure effective wetting power are on the other hand responsible for the effective formation and stabilization of foam. A good basis for a deeper understanding of foaming behavior offer phase behavior studies. In the case of alcohol ethoxylates a lot of those studies exist and the connection between the water solubility, the cloud point phenomena and the foaming behavior is generally recognized. However, the situation is more complex in the case of the alcohol EO-PO adducts, which are empirically recognized as low foaming agents. Up to now there is no coherent set of physico-chemical studies to provide a basic understanding of the low foaming behavior. This presentation gives some insight into the principles lying behind the foaming action of surfactants and compares the physico-chemical characteristics of alcohol ethoxylates and EO-PO adducts. The results can give the formulator guidance for selecting low foaming surfactant for more demanding applications. |
| Note de contenu : |
- Application properties
- Defoaming mechanism
- FIGURES : 1. Cotton wetting times and Schlag foam volumes of ITDA ethoxylates as function of EO grade or HLB, respectively - 2. Cotton wetting times and turbine foam volumes of alcohol alkoxylates as function of HLB - 3. Phase diagram of lin. C12 ethoxylate as function of temperature and surfactant concentration (schematically redrawn from - 4. Schematics of the phase separation and the spreading and bridging mechanism in antifoaming - 5. Phase diagram of FT oxo C12/C13 alkoxylate as function of temperature and surfactant concentration |
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in SOFW JOURNAL > Vol. 131, N° 6 (06/2005) . - p. 63-68
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