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EFFECT OF SPENT ENGINE OIL WITH ADDITIVES ON WATER AND BIO RESISTANCE OF BIRCH AND PINE WOOD

A composition for impregnation of birch and pine wood was developed. The impregnation of samples 20x20 mm in size and 10 mm in length along the wood fibers was realized by the “hot-cold bath” method at 120oC for 40 min. The efficiency of impregnating composition was evaluated according to physical parameters: water absorption, swelling in tangential and radial directions. It was found that impregnation of birch and pine wood with spent engine oil (SEO) allows improving the antiseptic properties and water resistance of wood and, hence, to decrease the water absorption and swelling of the wood of these species. To enhance the effect of hydrophobization of wood, inorganic (aerosol, clinoptilolite) and organic (oak bark flour) fillers (0.5; 1; 2%) were added to SEO. A non-linear dependence of the wood characteristics on the filler content in impregnating composition was observed. The addition of organic filler was more effective in improving the water resistance of wood as compared to inorganic ones. The impregnating composition with 1% of oak bark flour revealed the highest wood water absorption indicators, as a result, the present organic filler is the most promising in abatement of water absorption and swelling. The analysis of biostability of the samples allows us to ascertain that there is no biological damage in the impregnated wood. The present research illustrated that the use of SEO as a matrix for impregnation of birch and pine wood may partially solve the problem of its utilization, thereby creating the possibility of resource saving. The use of oak bark flour as a filler solves another problem – the obtaining of an effective and environmentally friendly impregnating composition.