| Titre : |
Defoamers - nothing but empirical results ? |
| Type de document : |
texte imprimé |
| Auteurs : |
Ellen Wallhorn, Auteur ; Wernfried Heilen, Auteur ; Stefan Silber, Auteur |
| Année de publication : |
1997 |
| Article en page(s) : |
p. 911-918 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Antimousse
Encre
Revêtements -- Additifs
Revêtements en phase aqueuse:Peinture en phase aqueuse
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
In this paper we first investigate particle size distributions of defoamer droplets in water-borne paints and inks. The size distribution of those droplets is of crucial importance for the defoaming effect. We have determined that it is influenced by different factors during manufacture and application: (1) shear rate, (2) emulsifying properties of the binder and other formulation ingredients, (3) time of incorporation and storage time, (4) viscosity ratio of defoamer droplet ηd and the matrix phase ηm and (5) the interfacial tension γmd between droplet and matrix. The given fundamental results enable better recommendations for the use of defoamer compounds and emulsions. |
| Note de contenu : |
- Mechanism of defoamer activity
- Experimental part - Defoaming materials - Incorporation - Test methods - Measurement of defoamer droplet size - Measurement of interfacial tension
- Fundamental results obtained in the alkyd system as an example - Addition - Defoamer emulsions for mild stirring - Compounds for addition during grinding stage - Influence of ohter components in paint formulation - Long-term activity through high interfacial tension - Prethinning the active matter
- Defoamer proposals for different systems - Filled defoamer emulsion for the alkyd system - Dispersibility of test systems - Hydrophilic compound for the acrylic system - defoamer emulsion for the polyurethane system |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11432 |
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 10/97 (10/1997) . - p. 911-918
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Defoamers - nothing but empirical results ? in EUROPEAN COATINGS JOURNAL (ECJ), N° 10/97 (10/1997)
