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The objective of the paper was to estimate the limit of the fungicidal value of wood tar being a product of pyrolysis of wood previously treated with creosote oil or salt preservative of the CCB type. The effectiveness of wood tar in wood protection against fungi causing brown rot and soft rot was compared to the effectiveness of creosote oil (type WEI-B). Wood was impregnated with alcohol solutions of the preservatives and next subjected to the action of the following fungi: Coniophora puteana, Poria placenta and Coriolus versicolor. The fungicidal values of the investigated preservatives were determined with the use of the short agar-block method and the ageing test according to the standard PN-EN 84. It was found that wood tar being a product of pyrolysis of used wood which was previously treated may be a potential preservative for wood protection or a component of preservatives. However, better fungicidal properties were found for wood tar obtained from wood previously treated with creosote oil.
The presented paper discusses utilisation of glyceride compounds as well as glyceride compounds in mixtures with silico-organic compounds as a potential active constituent of biocide-free systems enhancing biological wood durability. Experiments were carried out on Scots pine (Pinus sylvestris L.) wood with respect to wood decaying fungi. In addition, biological tests were conducted taking into consideration aging processes. The applied system turned out to have potential possibilities of competing with biocidal systems that are being withdrawn for ecotoxicological reasons.
The study analyzed the reactivity of wood with water-based systems containing methyltrimethoxysilane (MTMOS) and an acrylic binder. A structural analysis of wood treated with organosilanes and then extracted with water, was performed using (Fourier transform infrared spectroscopy (FTIR). In the FTIR spectra, the analyzed bands included 1250 cm-1which are responsible for vibrations of SiC and/or SiO groups. These bands are characteristic for silicon bonds with atoms of carbon and oxygen originating from the methoxy groups found in organosilanes. The presence of these bands in the spectra proves the occurrence of a reaction between wood and MTMOS. The concentration of silicon was determined by Atomic absorption spectroscopy (AAS) in treated wood and then extracted with water.
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