Effect of Calcium Carbonate Particle Size on the Scratch Resistance of Rapid Alkyd-Based Wood Coatings

Polymer-based wood coatings are used for aesthetic purposes as well to protect surfaces, especially under external conditions. High-hardness mineral fillers thought enhance the resistance of these polymer wear and scratching. However, recent studies suggest that relatively low-hardness calcite (CaCO3, Mohs hardness 3) performs similarly harder minerals 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 rapid alkyd-based coating formulations, effect particle size on scratch behavior was investigated identical test The morphologies, hardness, roughness values scratched surfaces indicated including finer-grained experienced plastic plowing-type deformation form regular, narrow, shallow scratches, showing high resistance. Coatings using coarser-grained extensive plowing–tearing type owing weaker filler–polymer interface breakage larger pieces from surface.