Progress in understanding water transport through coatings into wood
conference paper
Coatings are widely applied on wooden substrates for protective and aesthetical reasons. Moisture accumulation inside wood causes favorable conditions for decay. Understanding the barrier properties of a coating determined by composition, substrate and weathering conditions are of utmost importance for improving the performance of coatings on wood. The research presented, shows how to visualize water transport through polymeric coatings into wood by Nuclear Magnetic Resonance (NMR). The results show that the moisture barrier depends on the specific combination of wood and coating. The barrier properties of the waterborne acrylic and the solventborne alkyd coatings varied between the different wood types used. Since, the water permeability is governed by the parameters such as the type of wood and the coating composition, the influence of pigments on the water permeability of waterborne coating system was studied. Especially, the effect of the interfacial layer of dispersent surrounding the pigments was studied. An acrylate based binder was mixed with different glass sphere concentrations and sizes. The experiments show that water is absorbed more quickly by coatings containing glass spheres. As a next step, the effect of binder in solventborne and waterborne coatings having well defined components is currently studied and presented.
TNO Identifier
868904
Source title
Proceedings of the 10th COSI Coatings Science International Conference, Noordwijk, The Netherlands
Collation
4 p.
Files
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