Bioinspired Living Coating System in Service: Evaluation of the Wood Protected with Biofinish during One-Year Natural Weathering

Faksawat Poohphajai, J. Sandak, M. Sailer, L. Rautkari, T. Belt, A. Sandak
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引用次数: 9

Abstract

The service life performance of timber products exposed to natural weathering is a critical factor limiting the broad use of wood as an external building element. The goal of this study was to investigate the in-service characterization of an innovative biofinish coating system. It is a novel surface finishing solution based on the bioinspired concept of living fungal cells designed for effective wood protection. The performance of Scots pine (Pinus sylvestris L.) wood coated with biofinish was compared with uncoated references. Samples were exposed to natural weathering for 12 months under the climatic conditions of northern Italy. The visual appearance, colour, gloss, wettability, and 3D surface topography of the wood surface were examined. Results revealed that the total colour changes (∆E) of biofinish-coated wood were negligible. Untreated Scots pine wood revealed the changes in colour after just three months of exposure. The gloss changes of both surface types were small. The contact angle measured on biofinish-coated wood was higher compared to that of uncoated Scots pine. Surface roughness increased in uncoated wood due to the erosion effect caused by the weathering progress. Conversely, the surface roughness of biofinish-coated samples decreased along the exposure time. This phenomenon was explained by two self-healing mechanisms: migration of non-polymerized oil to the cracked surface, where it polymerizes and creates a closed layer, and local regrowth to cover damaged spots by living fungal cells present in the coating. The obtained results revealed the superior aesthetic performance of the biofinish surface treatment against natural weathering. By considering the fully bio-based nature of the investigated coating, it was concluded that this solution can be an attractive alternative for state-of-the-art wood protection technologies.
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使用中的生物涂料系统:生物涂料保护木材一年自然风化的评价
暴露在自然风化下的木制品的使用寿命性能是限制木材作为外部建筑元素广泛使用的关键因素。本研究的目的是研究一种创新的生物整理涂层系统的使用特性。这是一种新颖的表面处理解决方案,基于活真菌细胞的生物灵感概念,旨在有效保护木材。对涂有生物漆的苏格兰松木材的性能与未涂有生物漆的对照进行了比较。样品在意大利北部的气候条件下自然风化12个月。检查了木材表面的视觉外观、颜色、光泽、润湿性和3D表面形貌。结果表明,生物涂饰木材的总颜色变化(∆E)可以忽略不计。未经处理的苏格兰松木在暴露三个月后就显示出颜色的变化。两种表面类型的光泽度变化都很小。涂有生物漆的木材的接触角比未涂有生物漆的苏格兰松高。由于风化过程引起的侵蚀作用,未涂覆木材的表面粗糙度增加。相反,生物光洁度涂层样品的表面粗糙度随着曝光时间的增加而降低。这种现象可以用两种自愈机制来解释:非聚合油迁移到破裂的表面,在那里聚合并形成一个封闭层,以及涂层中存在的活真菌细胞局部再生以覆盖受损点。结果表明,生物表面处理具有良好的抗自然风化的美观性能。考虑到所研究涂层的完全生物基性质,得出的结论是,这种解决方案可以成为最先进的木材保护技术的有吸引力的替代方案。
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