Small amount of inorganic nanoparticles, e.g. most commonly used titanium dioxide, zinc oxide and cerium dioxide (CeO2), incorporated in transparent water-based coating stucture have a promising photostability of the coating system against harmful ultraviolet light rays. Moreover, there is a theory, that increasing the amount of nanoparticles in coating structure, the latter’s can penetrate and distribute preferably in wood surface layers which can lead to the different interlock strength. The aim of this work is to estimate the cerium dioxide, as inorganic metal nanoparticles additives, impact on the the adhesion strenght of transparent wood coatings to softwood substrate.
For the research the samples of pine (Pinus sylvestris L.) wood were used with dimensions of 45×45×20 mm. Pine wood samples were defect free, kiln dried, radial cut and sanded (120-grit, by FEPA). In order to reduce the influence of wood anatomy and surface processing, the average wood density, surface grain direction, moisture content, number of the annual rings per 1 cm were evaluated. Early and latewood surface roughness parameters Ra, Rz and Rmax were controlled using contact stylus profilometer „Mahr Marsurf PS1“. Pine wood samples were coated with transparent water-based acrylic (AK) wood coating containing three different concentrations of the CeO2 nanoparticles (up to 5 %; particle size 10 nm). The adhesion strength was assessed using the pull-off method according to ISO 4624:2002. After the test, the nature of the fracture was evaluated visually.
It was determined, that increasing the amount of CeO2 nanoparticles in acrylic coating structure, the adhesion strength to pine wood surface changes significantly.
Keywords: pine wood, acrylic coating, CeO2 nanoparticles, adhesion strength
Authors
Balvočiūtė S.
Department of Materials Engineering, Kaunas University of Technology, Kaunas
Vitosytė J.
Department of Materials Engineering, Kaunas University of Technology, Kaunas
Ukvalbergienė K.
Department of Production Engineering, Kaunas University of Technology, Kaunas
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