Durability of the Exterior Transparent Coatings on Nano-Photostabilized English Oak Wood and Possibility of Its Prediction before Artificial Accelerated Weathering

Abstract

Changes in surface material characteristics can significantly affect the adhesion and overall life of coatings on wood. In order to increase the durability of transparent exterior coatings, it is possible to use the surface modification of wood with UV-stabilizing substances. In this work, selected types of surface modifications using benzotriazoles, HALS, ZnO and TiO2 nanoparticles, and their combinations were applied to oak wood (Quercus robur, L.). On such modified surfaces, the surface free energy, roughness, and contact wetting angle with three selected types of exterior transparent coatings were subsequently determined. An oil-based coating, waterborne acrylic thick layer coating, and thin-layer synthetic coating were tested and interaction with the aforementioned surface modifications was investigated after 6 weeks of accelerated artificial weathering. The results of changes in the initially measured surface characteristics of the modified oak wood were compared to the real results of degradation of coatings after artificial accelerated weathering. The positive effect of surface modification, in particular the mixture of benzotriazoles, HALS, and ZnO nanoparticles on all kinds of coatings was proven, and the best results were observed in thick-film waterborne acrylic coating. The changes in the measured surface characteristics corresponded to the observed durability of the coatings only when measured by wetting using drops of the tested coatings.

Nanomechanical and Electrochemical Properties of ZnO-Nanoparticle-Filled Epoxy Coatings

“…The use of different nanosized fillers results in the creation of material that possess excellent properties, which can be utilized in a vast range of applications. In order to promote the use of polymer coatings, several nanotechnology-based attempts have been made specifically related to outdoor performance [10][11][12][13][14][15]. In the literature, numerous research works have highlighted the use of ZrO 2 , ZnO, and TiO 2 nanoparticles in order to achieve a higher performance of polymeric nanocomposites, and they are even used to enhance the polymeric coating's performance [10,[16][17][18][19][20][21].…”

Enhancing Weathering Resistance of Wood—A Review

“…Moreover, studies have also shown that the combined protection of coatings with UV absorbers (organic and inorganic) and HALS has a positive effect on the protection of wood from UV radiation. Thus, a positive effect of a combination of ZnO nanoparticles, benzotriazole, and HALS in a penetrating coating system on the colour stability of oak wood during UV radiation was reported by [ 91 ]. Furthermore, Rao et al [ 79 ] found that the combination of benzotriazole and ZnO nanoparticles showed the best performance for colour stabilisation of bamboo due to UV radiation.…”

Surface Modification of Metallic Nanoparticles for Targeting Drugs

“…Peptides are also widely used as targeting ligands given their high receptor affinity, low immunogenicity, ease of synthesis, and small size [37]. Targeting peptides can be identified through phage display screening or rational design based on interacting motifs [63]. Finally, small molecules, carbohydrates, vitamins (e.g., folic acid), and other receptor-binding moieties are also utilized as ligands [64].…”