Liang Guotao, Yao Fengbiao, Qi Yanran, Gong Ruizhi, Li Rui, Liu Baoxuan, Zhao Yueying, Lian Chenglong, Li Luming, Dong Xiaoying, Li Yongfeng
State Forestry and Grassland Administration Key Laboratory of Silviculture in Down-Stream Areas of the Yellow River, College of Forestry, Shandong Agricultural University, Tai'an 271018, China.
School of Automation, Chongqing University of Posts and Telecommunications, Chongqing 400065, China.
Polymers (Basel). 2023 Feb 10;15(4):882. doi: 10.3390/polym15040882.
Waterborne polyurethane coatings (WPU) are widely used in various types of coatings due to their environmental friendliness, rich gloss, and strong adhesion. However, their inferior mechanical properties and solvent resistance limit their application on the surface of wood products. In this study, graphene oxide (GO) with nanoscale size, large surface area, and abundant functional groups was incorporated into WPU by chemical grafting to improve the dispersion of GO in WPU, resulting in excellent mechanical properties and solvent resistance of WPU coatings. GO with abundant oxygen-containing functional groups and nanoscale size was prepared, and maintained good compatibility with WPU. When the GO concentration was 0.7 wt%, the tensile strength of GO-modified WPU coating film increased by 64.89%, and the abrasion resistance and pendulum hardness increased by 28.19% and 15.87%, respectively. In addition, GO also improved the solvent resistance of WPU coatings. The chemical grafting strategy employed in this study provides a feasible way to improve the dispersion of GO in WPU and provides a useful reference for the modification of waterborne wood coatings.
水性聚氨酯涂料（WPU）因其环境友好、光泽丰富和附着力强而广泛应用于各类涂料中。然而，其较差的机械性能和耐溶剂性限制了它们在木制品表面的应用。在本研究中，通过化学接枝将具有纳米级尺寸、大表面积和丰富官能团的氧化石墨烯（GO）引入WPU中，以改善GO在WPU中的分散性，从而使WPU涂料具有优异的机械性能和耐溶剂性。制备了具有丰富含氧官能团和纳米级尺寸的GO，并使其与WPU保持良好的相容性。当GO浓度为0.7 wt%时，GO改性WPU涂膜的拉伸强度提高了64.89%，耐磨性和摆杆硬度分别提高了28.19%和15.87%。此外，GO还提高了WPU涂料的耐溶剂性。本研究采用的化学接枝策略为改善GO在WPU中的分散性提供了一种可行的方法，并为水性木器涂料的改性提供了有益的参考。
