等温热压印法制备超疏水薄膜

Fabrication of Super Hydrophobic Surfaces in the Way of Isothermal Hot Embossing in Solid-like State

以刷涂有疏水性SiO_2微球的筛网作为模具,通过等温热压印的方法,在聚乙烯(PE)塑铝复合薄膜上制备出超疏水表面。对压印压力、筛网目数、SiO_2微球直径等参数对制品表面微结构形貌和疏水性能的影响进行了研究。结果表明,该方法可以在PE塑铝复合薄膜表面构筑出具有良好疏水效果的二级复合微结构;在压力作用下,SiO_2微球会与PE基体共混形成复合体系,使得SiO_2微球与基体的连接更加稳定;增加热压印压力可以增大微米级结构的深度,但是过大的压力会导致SiO_2微球被PE覆盖,合理的压印压力应在8～12MPa之间;减小SiO_2微球的粒径可以进一步提高接触角数值;制品对水的接触角达到150°,滚动角低至1°,达到了超疏水的标准。

A superhydrophobic surface was fabricated on the plastic-aluminum composite film by an isothermal hot embossing method in the solid-like state using a sifter covered with SiO 2 microspheres as a mold through.The effects of impression pressure,sifter size and microsphere diameter on the microstructure and hydrophobicity of the resulting products were studied.The results indicated that the composite microstructure with a hydrophobic effect can be constructed on the surface of aluminum-plastic composite films.The SiO 2 microspheres could be well blended with PE matrix to form a composite system under a pressure,which led to a much stable connection between the matrix and SiO 2 microspheres.The depth of the micrometer structure was improved with an increase of hot-embossing pressure,and however the overloaded pressure might result in a cover of SiO 2 microspheres with PE.The reasonable imprint pressure should be set as 8~12 MPa.The decrease of microsphere size could further result in an increase in water contact angle.The products achieved a superhydrophobic property when the water contact angle and rolling angle reached 150°and 1°,respectively.