定向防粘附润滑涂层制备及其性能

Preparation and Properties of Oriented Anti-adhesion Lubricating Coating

通过仿生猪笼草的润滑表面和稻叶表面的导向结构,制备了一种工艺简单、双疏、定向防粘附的润滑涂层。利用砂纸以相同方向在PP表面打磨得到导向性微结构。对此结构进行紫外/臭氧处理、化学沉积1H,1H,2H,2H-全氟辛基三氯硅烷、灌注全氟聚醚制备了润滑表面。分别用SEM、粗糙度测量仪和接触角测量仪,对涂层进行了表征和分析。结果表明,在PP表面定向打磨得到的'沟槽'微结构为存储润滑液提供了条件。当PP表面粗糙度Ra≈1.891μm时水接触角为135?,氟硅烷沉积后水接触角为141?。浸渍润滑液后得到的PP润滑涂层对水和十二烷接触角分别为105?、59?,定向水和十二烷的倾斜角分别为2?、4?;在蜂蜜和沐浴露中浸泡0.5 h后润滑涂层表面粘附量比未处理表面分别降低了89.4%、70%。

A lubricating coating with simple process,stable chemical properties and oriented anti-adhesion was prepared by simulating the lubricated surface of pitcher plant and the guiding structure of the surface of rice leaf.The oriented rough microstructure was obtained by grinding the polypropylene(PP)with sandpaper in the same direction.After the microstructure was treated by ultraviolet/ozone,1H,1H,2H,2H-perfluorooctyl trichlorosilicon was chemically deposited on it,and then perfluoropolyether was poured into the surface microstructure to obtain the lubricating surface.SEM,roughness tester and contact angle tester were used to analyze the coating surface.The results showed that the surface grooves obtained by directional polishing provided conditions for storing lubricants.When the roughness(Ra)of PP surface was about 1.891μm,the water contact angle on the PP surface was 135°,and that on the fluorosilane deposited PP surface was 141°.The PP lubricating coating obtained after impregnating the lubricating liquid had the contact angle of 105°and 59°for water and dodecane,respectively.The tilted angles of the oriented water and dodecane are 2°and 4°,respectively.After soaking in honey and shower gel for 0.5 h,the corresponding adhesion amount of the lubricated PP coating reduced by 89.4%and 70%,respectively,compared with the untreated surface.