[article]
| Titre : |
Silicones additives for aqueous coating systems |
| Type de document : |
texte imprimé |
| Auteurs : |
Karl-Heinz Käsler, Auteur |
| Année de publication : |
1996 |
| Article en page(s) : |
p. 411-414 |
| Langues : |
Anglais (eng) |
| Catégories : |
Mouillage (chimie des surfaces)
Revêtements -- Additifs
Revêtements en phase aqueuse:Peinture en phase aqueuse
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
Surfactants
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The development and use of aqueous coatings have increased considerably in recent years. The range of applications has been widened to include clear and high-gloss systems as, for exemple, automotive finishing coats, industrial paints, plastics coating and furniture finishes. However, these applications have a fairly large number of problems, especially as far as optical properties are concerned.
The flow properties are disrupted by poor substrate wetting, and edge thinning.
The film surface is uneven.
Pinholes form in the film surface.
Foam forms, resulting in unattractive structures or holes.
These problems are not unknown in conventional solvent-borne systems. However, they can often be overcome by using suitable combinations of different solvents, for exemple, polar and non-polar solvents. This option is not available for water-borne systems or, at least, only to a limited extent through the addition of co-solvents. Any difficulties which arise must be eliminated through the use of suitable additives.
Our work has shown that one additive alone is often inadequate. Just as solvent combinations are used in solvent-borne systems, water-borne systems require a selected combination of additives such as fluorosurfactants and polysiloxanes or wetting agents and polysiloxanes.
Although this paper concentrates largely on the polysiloxanes, there is some discussion of suitable combinations. |
| Note de contenu : |
- TEST PRODUCTS : MODIFIED POLYSILOXANES
- APPLICATIONS TESTING
- FLOW : Defoaming - Interaction of various additives |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17104 |
in SURFACE COATINGS INTERNATIONAL > Vol. 79, N° 9 (09/1996) . - p. 411-414
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