Browsing by Author "Uysal, B."

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Bleaching on Wood and Colour Changing Effects of Varnishes
(TUBITAK, 1999) Uysal, B.; Sönmez, A.; Atar, M.; Özçifçi, A.
The objective of this research was to determine colour changing proporties of sodium hydroxide + hydrogen peroxide, sodium hydroxide + calcium hydroxide + hydrogen peroxide, hypochlorite and hydrochloric acid applied on the pine (Pinus silvestris l), oriental beech (Fagus orientalis libsky), ash wood (Fraxinus excelsior l.) and oak (Quercus petraea spp), The second steps of research was to determine colour changing effects of acrylic, synthetic, polyurethane and acid catalized varnishes on the bleached wood samples. Results indicated that sodium hydroxide + hydrogen peroxide and sodium hydroxide + calcium hydroxide+hydrogen peroxide chemicals are strong bleaches, hypochlorite and hydrochloric acid chemicals are weak bleaches, acrylic and synthetic varnishes gave the lightest colour but polyurethane and acid hardener varnishes gave the darker colour. © 1999, TUBITAK. All rights reserved.
The Effects of Wood Bleaching Chemicals on the Bending Strength of Wood
(TUBITAK, 1999) Uysal, B.; Atar, M.; Özçifçi, A.
The aim of this research was to determine the effects of bleaching chemicals on the bending strength of wood. For this purpose, sodium hydroxide + hydrogen peroxide, sodium hydroxide + calcium hydroxide + hydrogen peroxide, hypochlorite and hydrochloric acid were applied to pine (Pinus sylvestris L.), oriental beech (Fagus orientalis Lipsky), ash (Fraxinus excelsior L.) and oak (Quercus petraea spp.) for bleaching. The results indicate that the hypochlorite and hydrochloric acid solutions caused the greatest decrease in the bending strength of the woods used in the experiment.
The Effects of Wood Bleaching Chemicals on the Surface Gloss and the Adhesion Strength of Varnishes
(TUBITAK, 1999) Özçifçi, A.; Atar, M.; Uysal, B.
In this research, sodium hydroxide + hydrogen peroxide, sodium hydroxide + calcium hydroxide + hydrogen peroxide, hypochlorite and hydrochloric acid were applied to pine (Pinus sylvestris L), oriental beech (Fagus orientate Lipsky), ash wood (Fraxinus lanceolata) and oak (Quercus petraea spp.) for bleaching. Next, acrylic, synthetic, polyurethane and acid-catalyzed varnishes aplied on the bleached wood samples. Afterwards, the effects of these bleaches on the surface brightness and the adhession strength of varnishes were studied. The results indicate that the bleaching agents used did not affect surface gloss, whereas the type of wood and varnish did. Acrylic varnish yielded the glossiest surface while acid-catalyzed varnishes gave the least glossy surface. It was determined that the HCl solution had decreased the adhesion strength of varnishes.