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Pretreatments of wood to enhance the performance of outdoor coatings

: Lukowsky, D.; Hora, G.


Macromolecular symposia 187 (2002), S.77-85
ISSN: 0258-0322
ISSN: 1022-1360
Fraunhofer WKI ()
coating; wood; adhesion; dispersion; cold plasma

The wet adhesion of water borne acrylic dispersions is a crucial factor on the performance of outdoor coatings on wood. Pine sapwood was treated with several methods for surface activation to increase the wet adhesion of water borne acrylic dispersions. The wet adhesion was measured by pull-off tests as well as with a modified cross-cut test. Atmospheric plasma, corona treatment and fluorination increased the wet adhesion of the coating which is attributed to the increasing polar portion of the surface free energy. Other ways of improving the wet adhesion are the addition of promotors, the use of primers and organisational improvements.