[article]
| Titre : |
Additives for foam control |
| Type de document : |
texte imprimé |
| Auteurs : |
Vladimir V. Verkholantsev, Auteur |
| Année de publication : |
1999 |
| Article en page(s) : |
p. 50-63 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The incorporation of air into paints during paint manufacture, handling and transport, and in the course of coating application is unavoidable. Mixing, dissolving, filtration, spraying and a number of other operations that are associated with stirring, pouring etc. produce foam. Foam is an air/liquid disperse system, containing bilateral liquid films stabilized with surfactant molecules. There are a few techniques that can be employed to destroy the foam, particularly mechanical, thermal and cheminical methods. The physicochemical approach, that is the use of foam controlling additives, is the most useful in paints and coatings. |
| Note de contenu : |
- What foams are
- Cheminical composition, colloidal characteristics and surfactant concentration influence foam generation
- Foaming may cause various coating defects
- Foam in paints and coatings
- There are two forms of air entrapment : bubbles and foam
- Foam formation and stabilization
- Foam control mechanisms
- Active substances, surface active agents, and carrier fluids are typical defoamer components
- Defoamer molecules must enter the bubbles spontaneously and spread across it
- Surfactants and defoamers form similar structures
- Efficiency of defoamers
- Three groups of defoamers for paints and coatins
- Surface healing
- Defoamers must provide efficient defoaming, good wetting, easy and complete emulsification in water
- Silicone-based and organic-based defoamers
- Two methods to assess the efficiency of defoamers
|
| En ligne : |
https://drive.google.com/file/d/1kBok6cQT9beSEDDPKW7A9ABpJU8rfvB6/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11189 |
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 5/99 (05/1999) . - p. 50-63
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