Enhancement of mechanical and thermal properties of UV-curable wood coatings by cellulose nanofibrils and carboxylated organo-montmorillonite,Polymer Composites

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Enhancement of mechanical and thermal properties of UV-curable wood coatings by cellulose nanofibrils and carboxylated organo-montmorillonite
Polymer Composites ( IF 4.8 ) Pub Date : 2024-03-14 , DOI: 10.1002/pc.28319
Yuhui Sun _{1,

2,

3} , Ling Long ₁ , Baojun Li _{2,

4} , Dingfeng Kong _{2,

4} , Changli Liang ₃ , Ming He _{2,

4} , Ru Liu ₁

Affiliation

In this study, the impact of incorporating cellulose nanofibrils (CNF) and carboxylated organo-montmorillonite (OMMT), separately or in combination, into a UV-curable wood coating was evaluated for performance enhancement. This study investigated the influence of nanoparticle loading percentage on the mechanical properties and thermal behavior of the coating, as well as the surface properties of digitally printed decorative wood-based panels. The results indicated that the addition of CNF or OMMT increased the viscosity of the polymer solutions. Although CNF randomly oriented within the matrices, OMMT adhered to the surface of the polymer matrix. Chemical crosslinking was observed between CNF/OMMT and the coating. The addition of CNF and OMMT improved the thermal stability of the neat UV curing coating. The tensile strength of nanocomposite films with a 6 wt% loading of CNF increased significantly from 7.63 MPa to 12.73 MPa compared to pure films. The reinforcing effect of CNF on the tensile performance was significantly better than that of OMMT. Adding CNF to the matte coating slightly improved the clarity of the printed decorative panels. When CNF and OMMT were added together in the coating, there was a synergistic enhancement in the low gloss and high pencil hardness of the panels.

中文翻译：

纤维素纳米纤丝和羧化有机蒙脱石增强紫外光固化木器涂料的机械和热性能

在这项研究中，评估了将纤维素纳米纤维（CNF）和羧化有机蒙脱石（OMMT）单独或组合掺入紫外光固化木器涂料中对性能增强的影响。本研究研究了纳米粒子负载百分比对涂层机械性能和热行为以及数字印刷装饰人造板表面性能的影响。结果表明，CNF 或 OMMT 的添加增加了聚合物溶液的粘度。尽管 CNF 在基质内随机取向，但 OMMT 粘附在聚合物基质的表面。在 CNF/OMMT 和涂层之间观察到化学交联。 CNF和OMMT的添加提高了纯UV固化涂层的热稳定性。与纯薄膜相比，CNF 负载量为 6wt% 的纳米复合薄膜的拉伸强度从 7.63MPa 显着增加到 12.73MPa。 CNF对拉伸性能的补强效果明显优于OMMT。在哑光涂层中添加 CNF 略微提高了印刷装饰面板的清晰度。当CNF和OMMT一起添加到涂料中时，面板的低光泽度和高铅笔硬度得到协同增强。

更新日期：2024-03-14

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