Abstract
Wood products require preservative and finishing treatments to raise their quality and market value, thus making their appearance more pleasing and their strength higher. The objective of this work was to analyze the wettability of the different finishes, as well as the penetration of the products by scanning electron microscopy. The present study used Scanning Electron Microscopy (SEM) with two replicates per sample and a Goniometer to observe the behaviour of the sessile gout with 5 replicates per sample and radial position. It was concluded that the water based varnish presented a diffuse layer when observed in the SEM and the polyurethane varnish formed a film on the substrate thicker than the other treatments. The copal varnish presented a higher contact angle and the nitrocellulose lacquer formed the smallest contact angle. Copal varnish and PU showed higher hydrophobicity and higher resistance to moisture.
Highlights
Finishing is used to value the original characteristics of wood by making its appearance more attractive, as well as protecting its surface (SOUZA et al, 2009; SOFUOGLU; KURTOGLU, 2014)
For polyurethane varnish (PU), it is possible to observe that the finishing formed a homogeneous, uniform and well-defined film in relation to the substrate
Microscopy The presence of air bubbles in the coating film/substrate interface is a primary aspect of non-wetting systems
Summary
Finishing is used to value the original characteristics of wood by making its appearance more attractive, as well as protecting its surface (SOUZA et al, 2009; SOFUOGLU; KURTOGLU, 2014). The quality of machining and finishing is influenced by properties of wood (CSANÁDY et al, 2015). According to Williams (2010) and Rowell (2012), properties attached to the surface of the substrate and the cellular structures in the wood affect the application and quality of the film. Since finishing emphasizes the aesthetic aspect of the wood, superficial irregularities of the wood tend to be highlighted by the application of varnishes. For this reason, it is important to prepare the surface, softening its imperfections with processes of sanding and planning (WATAI, 1995; COELHO et al, 2008; SOUZA et al, 2009)
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