一步溶胶凝胶法制备木基超疏水层的研究

Preparation of Superhydrophobic Surface on Wood Substrate by One-step Sol-gel

为简化超疏水木材的制备工艺,以正硅酸乙酯为前驱体,氨丙基三乙氧基硅烷为修饰剂,采用一步溶胶凝胶法构建超疏水木材,并研究了其表面形貌和疏水性能。结果表明:表面类荷叶的微纳米分级结构协同低表面能物质,使杉木转变为超疏水性,表面接触角达151.5°,动态接触角低于8°;试样在大气中放置1年,经强酸、强碱溶液分别浸泡及超声波清洗25 min后,接触角仍高于140°,保持了较好的疏水性能。

The authors developed a facile one step sol-gel method with TEOS as a precursor and KH550 as a modifier for preparation of a superhydrophobic surface on wood substrate which aims to simplify previous preparation methods. Surface morphology and water repellency of the treated sample were tested, respectively. The results indicated that the micro-nano hierarchical structures, similar to lotus leaves, combining with low-surface-free-energy material transformed the treated Chinese fir samples from a hydrophilic surface to a superhydrophobic surface, with a contact angle （CA） of 151.5° and a sliding angle lower than 8 ° . After exposure in an air environment for one year, then being immersed in acidic and alkali solutions for 14 hours, washed by an ultrasonic environment for 25 rain, the sample＇s surface still possessed great hydrophobic property with CA larger than 140° .