Investigation of the Effect of Heat Stress on the Surface Properties of Wood Coatings

This study investigates the effects of the thermal cycles on changes in impact resistance and hardness of some coatings used in the wood and furniture industries. Platanus wood species and three types of acrylic, polyurethane, and alkyd coatings made by the Reef factory were used. Also, scratch hardness, pendulum hardness, impact, and roughness tests were used to evaluate the surface properties of the samples before and after coating and thermal stresses. The results showed that the highest resistance to scratch hardness and pendulum hardness among the coatings were related to alkyd coatings. However, in the impact and surface roughness tests, it was found that Acrylic coating has more resistance than other polyurethane and alkyd coatings. Due to thermal stresses, the resistance generally decreased in all coatings, and the best performance was obtained with Acrylic coating. Also, the statistical analysis results showed a significant difference between Acrylic and alkyd coatings.