The effects of resin cleaning process on the layer performance of water based varnishes

The aim of this study was to investigate the effect of the resin which an additional components of wood and resin cleaning methods on the performance of the water-based varnish layer. For this purpose, scots pine (Pinus sylvestris L.), black pine (Pinus nigra subsp.), larch (Larix decidua) and spruce (Picea abies) woods were preferred in the preparing of samples which are anatomically include different amount of resin. Physical and chemical resin cleaning process was performed on the samples using acetone, cellulosic thinner, sodium hydroxide + hydrogen peroxide (NaOH + H2O2) and soft soap. Then, one and two component water-based varnishes were applied to the surface of this samples. Later, test samples were exposed to hot and cold-check test in accordance with the principles of ASTM D-1211. The changes of the color, glossiness, hardness, and adhesion resistance values of samples were measured according to ASTM D 2244, ASTM D 523, ASTM D 2240, and ASTM D 4541, respectively. In addition, the changes on the sample surfaces were examined via scanning electron microscope (SEM). According to test results, it is found that the resin cleaning chemicals and methods caused increase in color values, decrease in glossiness and adhesion values, although ineffective on the layer hardness value of water-based varnishes.