Accelerated weathering performance of Scots pine preimpregnated with copper-based chemicals before varnish coating Part:1 coated with cellulosic and polyurethane varnishes
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Erişim
info:eu-repo/semantics/openAccessTarih
2020Yazar
Gündüz, AhmetBaysal, Ergün
Türkoğlu, Türkay
Altay, Çağlar
Küçüktüvek, Mustafa
Toker, Hilmi
Peker, Hüseyin
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Gündüz, A., Baysal, E., Türkoğlu, T., Altay, C., Küçüktüvek, M., Toker, H., & Peker, H. (2020). Accelerated weathering performance of Scots pine preimpregnated with copper‐based chemicals before varnish coating Part: 1 coated with cellulosic and polyurethane varnishes. Coloration Technology, 136(1), 34-44.Özet
This study aimed to determine the effect of accelerated weathering on gloss, surface
hardness and colour changes of Scots pine (Pinus sylvestris L.). Test samples were
impregnated with Adolit KD‐5, Wolmanit CX‐8 and Celcure AC‐500 covered with
cellulosic and polyurethane varnishes. The results showed that the values of surface
hardness and gloss increased after accelerated weathering. While the surface hardness
of Scots pine was increased for impregnated and polyurethane‐coated varnish, it decreased for impregnated and cellulosic varnish‐coated Scots pine after 1000 hours of
accelerated weathering exposure. Copper‐based chemical impregnation and varnish
coating developed the gloss of Scots pine specimens relative to the surface characteristics observed in single‐coated Scots pine specimens. While the most appropriate
chemical was Celcure AC‐500 for surface hardness, it was Adolit KD‐5 for the gloss
of Scots pine after 1000 hours of accelerated weathering exposure. Wood specimens
impregnated prior to the application of varnish were more effective in stabilising the
colour of Scots pine than Scots pine only coated with varnish. Polyurethane varnish‐
treated Scots pine showed better colour stability for each partial and total accelerated
weathering exposure period. The total colour changes were lowest for polyurethane
varnish‐coated Scots pine impregnated with Celcure AC‐500 after 1000 hours of accelerated weathering exposure.