Study of the system wood-coating material - I. Wood-liquid coating material

This paper deals with the evaluation of wood - wetting process with coating materials on the basis of interactions of surface forces on phase boundary . The obtained results are compared with the actual state in the system woo d - coating material. Primary ability of coating materials - spontaneous sp reading over the wood surface has been proved. There is also the secondary influence of rheological properties of coating materials causing deformatio ns of the phase boundary, non-perfect wetting of the wood surface and appar ent lowering of adhesion work. The influence of rheological properties has been expressed by using the coefficient F the meaning of which follows from the comparison between results of adhesion work computed according to modi fied Young-Dupre equation and of adhesion work determined on the basis of t he interactions of surface forces on the phase boundary between wood and li quid coating materials. A direct dependence between the values of the coeff icient F and coating materials viscosity has been proved.