INNORENEW COE INTERNATIONAL CONFERENCE 2021, Ljubljana, Slovenia, 10 - 11 June 2021, vol.1, no.1, pp.43-44
The increasing environmental concern has increased the demand for natural products. Wood is biodegradable, renewable, and sustainable material in the world. It is used in lots of areas, from handicrafts to construction industries. However, wood has some disadvantages; for example, it can be degraded by biotic and abiotic factors under the appropriate conditions (Schmidt, 2006). Therefore, wood's service life is limited and results in a financial loss for both manufacturer and consumer. For this purpose, some wood preservatives have been developed to improve wood properties. However, environmental concerns have restricted preservatives to be harmless. Meanwhile, natural preservatives are easily decomposed in nature (Onuorah, 2000). In recent years, environmentally friendly wood surface preservatives have been preferred to decrease the weathering effects and improve the wood service life. Moreover, the wood preservatives containing tree bark extractives have become prominent for researchers (Galinane et al., 2015). Bark extracts containing phenolic compounds, flavonoids, lignans, tannins improved weathering resistance of wood (Grigsby and Steward, 2018). In this study, ten different tree bark extracts (fir, Calabrian pine, black pine, chestnut, spruce, cedar, beech, oak, alder, scotch pine) were evaluated as wood surface preservatives. Tree barks were extracted in 1% NaOH solution. Scotch pine and spruce wood surface protected with bark extracts were exposed to artificial weathering for 480 h. The color changes were investigated to determine the weathering performance of bark extracts. Moreover, the changes on the wood surface were also evaluated with microscopic and macroscopic evaluation. According to the results, the color changes were low in the extracts having high antioxidant capacity. The microscopic results also showed the differentiation on the wood surface after weathering. Likewise, in color changes, macroscopic evaluations demonstrated the color changes. Finally, the obtained results showed that bark extracts have the potential as wood surface preservatives.