Veigel Stefan, Lems Eva-Marieke, Grüll Gerhard, Hansmann Christian, Rosenau Thomas, Zimmermann Tanja, Gindl-Altmutter Wolfgang
Department of Material Sciences and Process Engineering, BOKU-University of Natural Resources and Life Sciences, Vienna, Konrad Lorenz Straße 24, 3430 Tulln, Austria.
Holzforschung Austria, Franz Grill Straße 7, 1030 Vienna, Austria.
Polymers (Basel). 2017 Sep 7;9(9):425. doi: 10.3390/polym9090425.
Due to their bio-based character, oil-based coatings become more and more prevalent in wood surface finishing. These coatings impart appealing optical and haptic properties to the wood surface, but lack sufficient protection against water and mechanical influences. The present study reports a simple green route to improve the performance of linseed oil coating by the addition of nanofibrillated cellulose (NFC). In order to achieve surface chemical compatibility with linseed oil, NFC was chemically modified with acetic anhydride and (2-dodecen-1-yl)succinic anhydride, respectively, using propylene carbonate as a solvent. NFC/linseed oil formulations were prepared and applied to wood substrates. The wear resistance of oil-coated wood surfaces was assessed by a newly developed test combining abrasive loading with subsequent contact angle measurement. As revealed by infrared and nuclear magnetic resonance (NMR) spectroscopy, as well as X-ray diffraction (XRD), NFC has been successfully modified without significantly affecting the structure of cellulose. In abrasion tests, all NFC-modified oil coatings performed better than the original oil. Interestingly, NFC only suspended in propylene carbonate, i.e., without chemical modification, had the strongest improvement effect on the coating's wear resistance. This was primarily attributed to the loose network structure of this NFC variant which effectively prevents the oil from penetration into the wood surface, thus forming a protective NFC/oil composite layer on the wood surface.
由于其基于生物的特性，油基涂料在木材表面涂饰中越来越普遍。这些涂料赋予木材表面吸引人的光学和触觉特性，但对水和机械影响缺乏足够的防护。本研究报道了一种通过添加纳米纤化纤维素（NFC）来改善亚麻籽油涂料性能的简单绿色途径。为了实现与亚麻籽油的表面化学相容性，分别使用碳酸丙烯酯作为溶剂，用乙酸酐和（2-十二碳烯-1-基）琥珀酸酐对NFC进行化学改性。制备了NFC/亚麻籽油配方并应用于木材基材。通过一种新开发的将磨料加载与后续接触角测量相结合的测试来评估涂油木材表面的耐磨性。红外光谱、核磁共振（NMR）光谱以及X射线衍射（XRD）表明，NFC已成功改性，且未显著影响纤维素的结构。在磨损试验中，所有NFC改性的油基涂料表现均优于原始油基涂料。有趣的是，仅悬浮在碳酸丙烯酯中的NFC，即未进行化学改性的NFC，对涂料的耐磨性改善效果最强。这主要归因于这种NFC变体的松散网络结构，它有效地阻止了油渗透到木材表面，从而在木材表面形成了一层保护性的NFC/油复合层。
