INTERLAYER WITH MICROCAPSULES AND ITS INFLUENCE ON THE SURFACE FINISH QUALITY OF WOOD

The paper deals with the quality of standard and modified surface finishes on beech, oak and spruce wood intended into exterior. Modified surface finish was created by the same coating materials as a standard surface finish, but it contained an interlayer with microcapsules. The quality of the surface finishes was assessed according to the film hardness, impact resistance, the resistance to scuffing, adhesion tests, the Cross-cut test and the Pull-off test for adhesion. The interlayer with microcapsules had no impact on the surface hardness of the surface finishes on beech wood and spruce wood, but it positively affected the film hardness of oak wood. The modified surface finish on beech wood and spruce wood showed a low impact resistance at a low drop height. It was more fragile and the impact resistance test resulted in the cracks formation. The modified surface finish was more resistant to scuffing. The adhesion of the standard and modified surface finishes to individual tree species, tested according to the Cross-cut test, was the same or minimally different. According to the Pull-off test, the standard surface finish showed higher adhesion to beech wood and oak wood when compared with the modified surface finish. On spruce wood, the Pull-off test for adhesion determined cohesion of wood surface layers.