Study of the System Wood – Coating Material. I. Wood – Liquid Coating Material

Abstract

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 wood − coating material. Primary ability of coating materials − spontaneous spreading over the wood surface has been proved. There is also the secondary influence of rheological properties of coating materials causing deformations of the phase boundary, non-perfect wetting of the wood surface and apparent 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 modified Young-Dupré equation and of adhesion work determined on the basis of the interactions of surface forces on the phase boundary between wood and liquid coating materials. A direct dependence between the values of the coefficient F and coating materials viscosity has been proved.

Utilization of surfactants for consolidation of wooden work of art

“…Similar behaviour of polymer solutions was described in the work of Liptáková et al (2000). On the contrary, the CA of a sessile drop of 30% EM/MA copolymer solution on both quartz glass and wood was larger than it could be assumed based on the measured surface tension: the liquid with surface tension of 28.3 mNØm -1 should wet both wood and quartz glass perfectly.…”

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

“…(a) (b) The applied coatings were also analyzed from the point of the surface wetting of treated wood, which is directly related to adhesion or penetration [74,75]. For all surface treatments (modifications 1-4 and untreated oak), penetration of hydrophobic coatings (A) and (B) was already observed at 1 and 3 s, respectively.…”

“…As mentioned in the study by Moya et al [76], it is likely that the smaller particles more easily penetrate into the applied coating and interfere with its integral polymer chain structure. The applied coatings were also analyzed from the point of the surface wetting of treated wood, which is directly related to adhesion or penetration [74,75]. For all surface treatments (modifications 1-4 and untreated oak), penetration of hydrophobic coatings (A) and (B) was already observed at 1 and 3 s, respectively.…”

Study of the System Wood – Coating Material. Part 2.Wood – Solid Coating Material

“…(Kawamura 1985(Kawamura , 1986Pecina and Paprzycki 1995;Nussbaum 1998;de Meijer et al 1998;Liptáková et al 1995Liptáková et al , 2000. Our study issues from the presumption that the system origin and stability are primarily determined by interactions of unsaturated force fields at the phase boundary woodsolid coating and cohesion of the basic components.…”

“…The system solid-liquid was analysed in the first part of this study (Liptáková et al 2000). Such interactions between the surface forces occurring at the phase boundary with the wood are manifested first through wetting and spreading of the liquid on the substrate surface.…”