Abstract
Polymer-based wood coatings are used for aesthetic purposes as well as to protect wood surfaces, especially under external conditions. High-hardness mineral fillers are thought to enhance the resistance of these polymer coatings to wear and scratching. However, recent studies suggest that the relatively low-hardness mineral calcite (CaCO3, Mohs hardness of 3) performs similarly to harder minerals under external conditions. It can replace more expensive hard minerals, thus driving research interest in its use. In this study, CaCO3 powders with different grain sizes were applied to rapid alkyd-based coating formulations, and the effect of CaCO3 particle size on the scratch behavior of the coatings was investigated under identical test conditions. The scratch morphologies, scratch hardness, and roughness values of the scratched surfaces indicated that the surfaces of the rapid alkyd-based wood coatings including finer-grained CaCO3 experienced plastic plowing-type deformation in the form of regular, narrow, and shallow scratches, showing high scratch resistance. Coatings using coarser-grained CaCO3 experienced more extensive plastic deformation of the plowing–tearing type owing to the weaker filler–polymer interface and the breakage of larger coating pieces from the coating surface.
Highlights
This study reveals the importance of grain size in the scratch hardness performance of CaCO3 in rapid alkyd-based wood coatings, and there is a need for comparison studies with harder minerals in future studies
It was shown that the scratch hardness values measured considering the scratch depth showed good correlations with the roughness of the coating surface after the scratch test
When finest-grained CaCO3 was used as a filler (Kal1), the surface of the rapid alkydbased wood coating (Coat1) underwent plastic plowing deformation in the form of regular, narrow, and shallow scratches, showing higher scratch resistance (632 N/mm2 )
Summary
It is used in interior and exterior applications owing to its durability, strength, lightness, and texture
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