ABSTRACT

Superhydrophobic coatings have attracted much attention due to their wide applications. However, they have poor durability when exposed to severe environmental conditions or external forces, which limited their application in outdoor environments. To deal with this problem, we prepared a durable superhydrophobic composite coating based on epoxy resin/flower-like zinc oxide/polydimethylsiloxane (ER/F-ZnO/PDMS) by a facile approach via layer by layer spraying. The F-ZnO was used to construct rough micro-nanometer scale structures and endow the coating with UV-protective ability. ER was applied to render mechanical strength and coating-substrate adhesion. PDMS was applied to further improve the hydrophobic performance of the coating. The effects of the mass ratio of F-ZnO and ER(M_F-ZnO: M_ER), PDMS, and F-ZnO (M_PDMS: M_F-ZnO) on the hydrophobicity and durability of the composite coatings were investigated. When the M_F-ZnO:M_ER and M_PDMS:M_F-ZnO were 13:5 and 0.075:1, respectively, the superhydrophobic coating exhibited excellent water-repellency with a water contact angle of 161.3 ± 2.3°, and sliding angle of only 0.8 ± 0.1°. Moreover, it possessed strong durability under severe environments, such as 120 sandpaper abrasion cycles, 5 high and low-temperature alternatively cycling, and intense ultraviolet irradiation for 40 h. The superhydrophobic coating showed outstanding antifouling properties for common liquid stains and muddy water.

摘要

超疏水涂层因其广泛的应用而备受关注。然而，当暴露于恶劣的环境条件或外力时，它们的耐久性较差，这限制了它们在户外环境中的应用。为了解决这个问题，我们通过逐层喷涂的简便方法制备了一种基于环氧树脂/花状氧化锌/聚二甲基硅氧烷（ER/F-ZnO/PDMS）的耐用超疏水复合涂层。F-ZnO用于构建粗糙的微纳米级结构并赋予涂层抗紫外线能力。应用 ER 以提供机械强度和涂层与基材的粘合力。应用PDMS进一步提高涂层的疏水性能。_{F-ZnO与ER(M F-ZnO} : M _ER)的质量比的影响, PDMS 和 F-ZnO (M _PDMS : M _F-ZnO ) 对复合涂层的疏水性和耐久性进行了研究。当 M _F-ZnO :M _ER和 M _PDMS :M _F-ZnO分别为 13:5 和 0.075:1 时，超疏水涂层表现出优异的拒水性，水接触角为 161.3 ± 2.3°，滑动角为仅为 0.8 ± 0.1°。此外，它在恶劣环境下具有很强的耐久性，例如120次砂纸磨损循环，5次高低温交替循环，以及40小时的强紫外线照射。超疏水涂层对常见的液体污渍和泥水表现出出色的防污性能。