Effects of hot-cold oil treatment on biological resistance and physical properties of Brutia pine sapwood

Abstract

This study investigated the physical properties of hot-cold oil-treated Brutia pine sapwood (Pinus brutia) and its biological resistance against wood-decay fungi. Weight percent gain, density, water absorption, and volumetric shrinking were chosen as the physical properties of the wood. White rot (Trametes versicolor) and brown rot (Neolentinus lepideus) were selected as the wood-decay fungi. Two different temperatures and two different time intervals were determined for the hot-cold oil treatment. Castor oil (Ricinus communis), flaxseed oil (Oleum linii), and a mixture of the two were used as the treatment oils (the medium of the hot-cold treatment). The results showed that the physical properties of the hot-cold oil-treated samples improved significantly compared to those of the control samples. In addition, after exposure to the decay fungi, the mass loss of the hot-cold flaxseed oil-treated samples decreased significantly more than in either the untreated samples or those treated with the other oils. There was a significant increase in the water repellent effectiveness and dimensional stability of the Brutia pine sapwood with all hot-cold oil treatments, but the hot-cold castor oil treatment appeared to have had no effect on decay resistance. A hot-cold oil treatment using flaxseed oil or a mixture including it could be a suitable method for improvement of the water repellent effectiveness, dimensional stability, and decay resistance of Brutia pine sapwood, as they both reduced the water uptake and the mass loss against the wood-decay fungi compared to the results of the control samples.

Oil Heat Treatment of Wood—A Comprehensive Analysis of Physical, Chemical, and Mechanical Modifications

“…Düzkale Sözbir et al (2021) took Stone pine (Pinus pinea L.) samples and after thyme oil bath for 5 min and 3 weeks resting in air conditions, the samples were heat-treated at 150 • C for 1 h. The results showed improvements in the physical properties and especially in water absorption. Var et al (2021) took Turkish pine (Pinus brutia L.) sapwood samples of 15 mm × 30 mm × 30 mm and heated them in a hot oil bath (castor oil, flaxseed oil, and mixed oil) at 110 • C for 6 h and cold oil bath for 2 h at 23 • C. This resulted in better dimensional stability and water repellence [78,79].…”

The Protection of Beech Wood (”Fagus Sylvatic”a) against the brown Rot ”Postia Placenta” using Clove (”Eugenia Caryophyllata”) Essential Oil in a Linseed Oil Medium

“…As the antifungal protective effect of LO as a wood treatment is not usually sufficient, several improvement methods have been proposed: chemical modification by epoxidation to reduce the long drying times and the sensitivity of the oil films to microbial colonization [9], [22], combination with biocides or other natural active ingredients [18], [21] or technologies combining impregnation with oils with a thermal treatment [13], [43].…”

Determination of Some Physical Properties of Oil Heat Treated Oriental beech Wood

“…confidence interval. While the oven-dry density values of the samples decreased as the heat treatment time increased in the samples subjected to oil heat treatment at 150 ºC, the ovendry density values of the samples increased as the heat treatment time increased in the samples subjected to oil heat treatment at 210 ºC Var et al (2021). sought to ascertain the oven-dry density values of Red pine treated with hot-cold bio-oil.…”