A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Wood modification to improve the durability of coatings
The aim of this work was to find solutions to improve the durability of coatings. Since their behaviour is linked to the dimensional variation of wood, increasing the coating flexibility makes it possible to obtain a greater service life: We have observed on a range of wood coatings that their durability is more important if their glass transition temperature stays below 25 - 30 Deg C during the weathering. Stabilizing dimensional variations of wood should be a means of improvement. However our experiments have shown that available treatments (thermal or chemical) lead to poor surface characteristics. A decrease in the wood wettability is noticed and the adhesion of coatings is not satisfying. Polyethylene glycol does not increase wood wettability. It can be added to the finished primer (waterborne products) and makes it possible to improve the behaviour of a topcoat applied on wood impregnated with such a modified primer. However further studies are necessary to better define treatment parameters. Since wettablility is decreased by thermal or chemical treatments, we have studied the influence of plasma treatments on wood in order to restore interesting surface properties. Results have shown that this technology is efficient on wood. Treatment parameters leading to better surface properties have been defined. However is has not been possible to prove the link between a good wood wettablility and a better coating adhesion, and further experiments are necessary to conclude on the effect of plasma treatments on the coating durability,
Wood modification to improve the durability of coatings
The aim of this work was to find solutions to improve the durability of coatings. Since their behaviour is linked to the dimensional variation of wood, increasing the coating flexibility makes it possible to obtain a greater service life: We have observed on a range of wood coatings that their durability is more important if their glass transition temperature stays below 25 - 30 Deg C during the weathering. Stabilizing dimensional variations of wood should be a means of improvement. However our experiments have shown that available treatments (thermal or chemical) lead to poor surface characteristics. A decrease in the wood wettability is noticed and the adhesion of coatings is not satisfying. Polyethylene glycol does not increase wood wettability. It can be added to the finished primer (waterborne products) and makes it possible to improve the behaviour of a topcoat applied on wood impregnated with such a modified primer. However further studies are necessary to better define treatment parameters. Since wettablility is decreased by thermal or chemical treatments, we have studied the influence of plasma treatments on wood in order to restore interesting surface properties. Results have shown that this technology is efficient on wood. Treatment parameters leading to better surface properties have been defined. However is has not been possible to prove the link between a good wood wettablility and a better coating adhesion, and further experiments are necessary to conclude on the effect of plasma treatments on the coating durability,
Wood modification to improve the durability of coatings
Modifikation von Holzoberflächen zur Verbesserung der Benetzbarkeit
Podgorski, L. (author) / Roux, M.L. (author)
1998
18 Seiten, 14 Bilder, 2 Tabellen, 16 Quellen
Conference paper
English
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