Abstract
This paper presents the research of influence of sanding, staining and the use of polyurethane and acrylic coating on the adhesion, scratch resistance and abrasion resistance of the coating. Objective was to determine the most important mechanical properties of lacquered surfaces, considering the application of Paulownia elongata and Paulownia fortunei, by using different systems of surface finishing. Cross cut method was used for measurement of adhesion. More accurate view of coating adhesion was obtained by measuring the scratch resistance. Abrasion resistance was tested by the method of free falling of abrasive particles. The applied system of sanding had no effect on the examined mechanical properties. Stained samples lacquered with PU coating showed better adhesion to the non-stained samples. Impact of staining on scratch resistance is not established. Stained samples showed greater resistance to abrasion for both wood species. Samples lacquered with PU coating showed the higher values of mechanical properties compared with samples lacquered with UV acrylic coating. Application of PU coating for surface finishing of Paulownia elongata and Paulownia fortunei is more adequate than the application of UV acrylic coatings, from the point of scratch resistance and abrasion resistance.
Highlights
This paper presents the research of influence of sanding, staining and the use of polyurethane and acrylic coating on the adhesion, scratch resistance and abrasion resistance of the coating
Stained samples lacquered with PU coating showed better adhesion to the nonstained samples
The average value of adhesion of samples lacquered with PU coating was 0.69, while the value of adhesion of all samples lacquered with UV acrylic coating was 1
Summary
За испитивања су коришћене две дрвне врсте из рода Paulownia Siebold еt Zucc: Paulownia elongata и Paulownia fortunei. Дрвне врсте из рода пауловниjа карактерише изузетно мала густина (J a i ć et al, 2010) и брзорастући раст (Ši jačićNikolić , 2009). Узорци на којима су вршена испитивања добијени су из трупаца који су посечени са огледног поља код Беле Цркве, у јуну 2009. Разрезивањем трупаца по дебљини утврђено је да постоји значајан градијент влажности по дужини сортимента. У циљу изједначавања влажности извршено је вештачко сушење резане грађе у лабораторијској сушари фирме „Nigos”. Након сушења извршено је мерење влажности пробних узорака гравиметријском методом. Коначана влажност узорака износила је 5,85% за Paulownia elongata и 6,06% за Paulownia fortunei
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