Surface Wettability Of Boron And Oil-Treated Wood

Abstract

Background: Nowadays, demands for more environmentally friendly and cost-effective preservatives are increasing, and new non-traditional procedures are being explored in wood protection field. Plant oils improve the dimensional stability, water repellency and equilibrium moisture content of wood, and protect wood against decay fungi by means of its hydrophobic properties. The aim of this study is to investigate the influence of heat treatment and oil impregnation with or without prior treatment with boron compounds on wetting characteristic of Scots pine (Pinus sylvestris L.) and beech (Fagus orientalis L.) wood. Wood specimens were impregnated with boric acid, borax and agricultural boron at concentrations of 1%, 2% and 5% followed by oil heat treated with waste and sunflower oil at 160ºC. Wettability was measured by contact angle with the sessile drop technique using water.Results: Water contact angles on oil treated specimens increased while wetting tension decreased, and the wood more poorly wetted by water compared to the controls. A change in the drop volume on the surface of double treated specimens was around 5% based on the initial drop volume. Waste oil treatment resulted in having the greatest water repellent efficiency. High loadings of boron compounds decreased the contact angle and therefore the quantity of water absorbed by the wood increased. Conclusion:Wettability was decreased in specimens pretreated with boron and this confirmed that the hydrophobic surface was created by oil. Wettability is a prerequisite for good adhesion, coating and painting and this feature may be reduced by the less hydrophilic surfaces created after oil heat treatment.

Ultraviolet light and natural weathering vs. the compression strength of laminated wood

“…The fact that the mechanical oil loading applied to the cell wall and the increase in the internal pressure in the cell wall cause microcracks in the cell wall layers has been reported to be the reason for this, and the microcracks in the S1 layer can decrease the resistance. A slight decrease in the compression strength parallel to the grains of wood impregnated with vegetable oils was also reported by Tomak (2011).…”

Water absorption and swelling of Betula pendula ROTH wood modified with oligomers from by-products of polybutadiene production

“…В целом, древесина, обработанная при более высоких температурах в течение более длительного времени, демонстрирует более значительную потерю массы, цвета и механических свойств, но большее улучшение стабильности размеров и биологической долговечности. Термическая обработка приводит к снижению большинства прочностных свойств древесины, которые зависят от температуры и времени обработки [18][19][20].…”