Alternative wood preservation method: double treatment and its effectiveness against wood decay fungi
- PDF / 771,373 Bytes
- 15 Pages / 595.276 x 790.866 pts Page_size
- 7 Downloads / 182 Views
ORIGINAL
Alternative wood preservation method: double treatment and its effectiveness against wood decay fungi Ilze Irbe1 · Zanete Zommere1 · Nina Kurnosova1 Received: 2 December 2019 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this study, two single wood treatments—copper impregnation (I) with thermo-hydro treatment (T) and vice versa—were combined to determine the effectiveness against wood decay fungi. Pine (Pinus sylvestris L.) sapwood and birch (Betula spp.) boards were treated accordingly, then cut into small-size specimens and exposed to brown rot (Coniophora puteana) and white rot (Trametes versicolor) fungi to determine mass loss (ML). The specimens were collected from the board ends and middle part to detect copper distribution and, consequently, decay resistance. Wood leaching according to EN 84 was performed to evaluate the double treatment efficiency in outdoor conditions (use class 3, EN 335). The durability of the board ends and middle part differed in single-impregnated wood. The higher amount of copper at the board ends tended to cause lower ML. Double-treated I/T boards showed a similar tendency. In double-treated T/I wood, a higher copper amount at the board ends provided a higher ML in this part. Obviously, the interaction between thermal and chemical treatment has affected the wood structure, copper distribution and fixation. In leached pine and birch wood, the double treatments T/I and I/T were more efficient against brown rot than single thermo-hydro treatment and impregnation procedures, ensuring the durability class (DC) 2 (CEN/TS 15083–1). Regarding white rot, there was no pronounced difference between both double treatments and single treatments as they ensured DC1.
1 Introduction There are many methods and approaches for wood protection against biodegradation for wood products of different purposes. Copper is by far the most widely used biocide in the wood preservation industry. Current products based on copper offer some of the best qualities and long lasting wood protection control. Thus, copper was and will continue to remain one of the key active components in the wood protection industry (Craciun et al. 2009). In the past decades, more attention has been given to the arsenic-free and chromium-free systems based on copper-HDO amine (Wolmanit CX), copper amine triazoles (Tanalith E), copper amine or copper ammonia quat (ACQ) or other copperbased systems (Craciun et al. 2009). All these copper-based systems were developed as safer, more environmentally friendly alternatives to chromated copper arsenate (CCA) * Ilze Irbe [email protected] 1
Laboratory of Wood Biodegradation and Protection, Latvian State Institute of Wood Chemistry, 27 Dzerbenes Str., Riga 1006, Latvia
to protect wood against the copper-tolerant decay fungi. However, due to environmental concerns regarding the use of certain classes of preservatives, there has been a renewed interest in wood modification. Wood modification represents a process that is used to improve the material prop
Data Loading...
