Xie Fei, Pu Yongzhe, Liang Yongchao, Qiu Jian, Zheng Ke, Gao Jingran
Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming 650224, China.
Key Laboratory of State Forestry and Grassland Administration on Highly-Efficient Utilization of Forestry Biomass Resources in Southwest China, Southwest Forestry University, Kunming 650224, China.
ACS Appl Mater Interfaces. 2025 Feb 5;17(5):8231-8247. doi: 10.1021/acsami.4c15350. Epub 2025 Jan 24.
Wood has a number of undesirable inherent properties that limit its ability to be used in a wider range of applications. For this reason, in this study, copper-montmorillonite nanoparticles were prepared from natural biomass tung oil and the natural mineral montmorillonite by the ion exchange method. Modified wood with tung oil intercalated with copper-montmorillonite was prepared by a simple and environmentally friendly impregnation and natural curing process. The natural curing rate of tung oil was greatly accelerated by the addition of copper-montmorillonite nanoparticles. The surface contact angle of the wood increased from 85.0° to 152.2° after copper-montmorillonite-tung oil treatment, and remarkably, it remained at 144.2° after 180 s. After 192 h of immersion, the water absorption decreased by 90.0% compared with the control group, of which the resistance to swelling was as high as 59.00%, which significantly improved the dimensional stability of the wood. After 15 days of ultraviolet irradiation, the copper-montmorillonite-tung oil-treated wood showed a 68.89% reduction in redness value compared to the control and a significant increase in ultraviolet resistance. Copper-montmorillonite-tung oil-treated wood showed greatly enhanced effectiveness against mildew. On the eighth day of infestation, the control wood was already full of mildew, whereas the copper-montmorillonite-tung oil-treated wood was not infested with mildew. In particular, after 28 days of infestation by , the modified wood remained free of the fungus, with 100% mildew prevention efficiency. In addition, after 2 weeks of leaching, the leaching rate of the impregnated material was only 0.22%, facilitating long-term protection of the wood. The present study by the copper-montmorillonite synergistic tung oil treatment strategy provides innovative methods and potential ideas for extending the service life of wood products and high-value utilization of wood and also has the potential to scale up wood protection.
木材具有许多不理想的固有特性，这限制了其在更广泛应用中的使用能力。因此，在本研究中，通过离子交换法由天然生物质桐油和天然矿物蒙脱石制备了铜 - 蒙脱石纳米颗粒。采用简单且环保的浸渍和自然固化工艺制备了桐油插层铜 - 蒙脱石改性木材。铜 - 蒙脱石纳米颗粒的添加大大加速了桐油的自然固化速率。经铜 - 蒙脱石 - 桐油处理后，木材的表面接触角从85.0°增加到152.2°，显著的是，180秒后仍保持在144.2°。浸泡192小时后，与对照组相比吸水率降低了90.0%，其中抗膨胀率高达59.00%，显著提高了木材的尺寸稳定性。紫外线照射15天后，铜 - 蒙脱石 - 桐油处理的木材与对照组相比红度值降低了68.89%，抗紫外线能力显著提高。铜 - 蒙脱石 - 桐油处理的木材对霉菌的防治效果大大增强。在侵染的第八天，对照木材已长满霉菌，而铜 - 蒙脱石 - 桐油处理的木材未被霉菌侵染。特别是，在侵染28天后，改性木材仍未感染真菌，防霉效率达100%。此外，浸出2周后，浸渍材料的浸出率仅为0.22%，有利于木材的长期保护。本研究通过铜 - 蒙脱石协同桐油处理策略为延长木制品使用寿命和木材高值化利用提供了创新方法和潜在思路，也具有扩大木材保护规模的潜力。
