Appearance and physical properties of treated wood intended for outdoor use have permanently been of great research interest. Since this information is particularly important for new and innovative formulations and treatments, this study investigates the effect of natural weathering on Scots pine sapwood treated with epoxidised linseed oil and a silane. Boards were impregnated in a pilot-scale autoclave at various technological parameters. In total, 12 treatments, 7 with epoxidised linseed oil and 5 with methyltriethoxysilane, were carried out and the timber was characterised. For monitoring of the weathering effects on the treated timber, specimens were cut from the planks and exposed above ground in Uppsala (Sweden) in an on-going long-term test. Pairs of specimens were strictly facing south and for every treatment one specimen was exposed at an angle of 90° while another specimen was fixed at 45° angle. The present paper presents some initial results after the first four months of exposure. Colour changes, based on the CIE*Lab system, water uptake and check propagation were measured during the testing period to figure out the changes between the treatments but also a comparison to untreated control samples. The intent of the study was to reveal optimal oil and silane formulations for industrial trials and marketing.
Keywords: weathering, epoxidised linseed oil, methyltriethoxysilane
Authors
Franke T.
Eberswalde University of Sustainable Development, Faculty of Wood Science and Technology, Eberswalde
Terziev N.
Swedish University of Agricultural Sciences, Department of Forest Products, Uppsala, Sweden
Panov D.
University of Tartu, Institute of Chemistry, Department Nature and Technology, Tartu, Estonia
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