Abstract: The superhydrophobic and oleophilic cosmetic cotton pads were prepared via vapour phase deposition method by using methyltrimethoxysilane as the modifier. The microscopic morphology and chemical structure of modified cotton pads were characterised by SEM and FT-IR, and the oil-water separation performance of the cotton pads was investigated. The results indicated that the hydrolytic modifier and the hydroxyl group in the polymer chain of the cosmetic cotton pads underwent a dehydration reaction, which resulted in the hydrophobic modification of the cotton pads. The water contact angle of the modified cotton pads was 151° and the oil contact angle was 0°, with good hydrophobic and oleophilic properties. The modified cotton pads can selectively adsorb oil in water with high oil-water separation efficiency, the separation flux is 22918 L/(h·m²), and the separation efficiency is still higher than 95.3% after 10 times of repeated use. The oil-water separation of emulsions can be effectively achieved under gravity drive. The modified cotton pads exhibit good anti-fouling effect on common domestic sewage, acid or alkali aqueous solutions, and show good self-cleaning performance, thus having broad application prospects in the field of oil-water separation.

Key words: vapour phase deposition method, superhydrophobicity, oil-water separation, self-cleaning

摘要： 以甲基三甲氧基硅烷为改性剂,通过气相沉积法制备了超疏水亲油化妆棉,利用扫描电子显微镜和傅立叶红外光谱对化妆棉的微观形貌和化学结构进行表征,探究了该化妆棉的油水分离性能。结果表明:改性剂水解后与化妆棉高分子链中的羟基发生脱水反应,成功地实现了化妆棉的疏水化改性,改性化妆棉的水接触角为151°,油接触角为0°,具有良好的疏水亲油性,能选择性吸附水中的油污,油水分离效率高,分离通量为22918 L/(h·m²),且重复使用10次后分离效率仍高于95.3%。重力驱动下可以有效实现乳液的油水分离,对常见生活污水及强酸、强碱水溶液均具有良好的防污效果,并具有良好的自清洁性能,在油水分离领域具有广阔的应用前景。

关键词: 气相沉积法, 超疏水, 油水分离, 自清洁