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http://dx.doi.org/10.5658/WOOD.2022.50.3.149

Preparation and Characterization of Hydrophobic Coatings from Carnauba Wax/Lignin Blends  

BANG, Junsik (Department of Agriculture, Forestry and Bioresources, College of Agriculture & Life Sciences, Seoul National University)
KIM, Jungkyu (Department of Agriculture, Forestry and Bioresources, College of Agriculture & Life Sciences, Seoul National University)
KIM, YunJin (Department of Agriculture, Forestry and Bioresources, College of Agriculture & Life Sciences, Seoul National University)
OH, Jung-Kwon (Department of Agriculture, Forestry and Bioresources, College of Agriculture & Life Sciences, Seoul National University)
YEO, wanmyeong (Department of Agriculture, Forestry and Bioresources, College of Agriculture & Life Sciences, Seoul National University)
KWAK, Hyo Won (Department of Agriculture, Forestry and Bioresources, College of Agriculture & Life Sciences, Seoul National University)
Publication Information
Journal of the Korean Wood Science and Technology / v.50, no.3, 2022 , pp. 149-158 More about this Journal
Abstract
To realize the infinite possibilities of materials derived from wood, it is necessary to overcome the weak moisture stability of wood. Thus, the development of an eco-friendly hydrophobic coating agent is essential, and of these, woody biomass-based materials are strongly attractive as coatings. In this study, eco-friendly hydrophobic wood coatings were prepared using carnauba wax purified from palm leaves and sprouts, and kraft lignin. The physicochemical properties of the carnauba wax/lignin blends according to the ratio of carnauba wax and lignin were observed by morphology and functional group change. In addition, the coating performance of carnauba wax/lignin blend coatings was confirmed by measuring the contact angle change. It was found that the addition of lignin could accelerate the atomization of wax particles, and that micro-roughness can be realized when applied to the actual wood surface, to ensure that the coating effect over time lasts longer. In addition, it was confirmed that the addition of lignin increases the hydrogen-bond-based interaction with the wood of the coating, thereby providing better coating stability and increasing the durability of the coating solvent under friction. The carnauba wax/lignin paint developed in this way is eco-friendly because all components are made of wood-based raw materials and have an excellent affinity with wood surfaces. Therefore, it is expected to be applicable to the coating process of wood-plastic composites and timber composites.
Keywords
lignin; wood coating; hydrophobic; carnauba wax; fluorine-free;
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