定向防粘附润滑涂层制备及其性能

Preparation and Properties of Oriented Anti-adhesion Lubricating Coating

摘要:

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聚丙烯（PP）等塑料表面打磨得到导向性微结构。对此结构进行紫外处理、化学沉积1H,1H,2H,2H-全氟辛基三氯硅烷、灌注全氟聚醚灌得到润滑表面。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R_a≈1.891um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0.5h后润滑涂层表面粘附量比未处理表面分别降低了89.4%、86.7%。

Abstract:

Inspired by the lubricated surface of pitcher plant and the guiding structure of the surface of rice leaf, a lubricating coating with simple process, stable chemical properties and oriented anti-adhesion was prepared. The oriented rough structure was obtained by grinding the plastic substrates such as polypropylene (PP) with sandpaper in the same direction. In this structure, 1H, 1H, 2H, 2H-perfluorooctyl trichlorosilicon was chemically deposited after ultraviolet treatment, and then perfluoropolyether was poured into the surface micro-structure to obtain the lubricating surface. SEM, roughness tester and contact angle tester were used to analyze the coating surface. The surface grooves obtained by directional polishing provided conditions for storing lubricants. The water contact angle of PP surface with Ra≈1.891um was 135°, and the water contact angle after fluorosilane deposition 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 oriented title angle of water and dodecane were 2° and 4° respectively and the inclination angles of the oriented water and dodecane are 2° and 4°, respectively; compared with the untreated surface, after being immersed in honey and shower gel for 0.5 hours the adhesion amount of the lubricated PP coating reduced by 89.4% and 86.7%.