Robust Waterborne Superhydrophobic Coatings with Reinforced Composite Interfaces,ACS Applied Materials & Interfaces

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Robust Waterborne Superhydrophobic Coatings with Reinforced Composite Interfaces
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-09-30 , DOI: 10.1021/acsami.0c14471
Dan Lin _{1,

2} , Xiguang Zhang _{1,

2} , Sicheng Yuan _{1,

2} , Yuan Li _{1,

2} , Fei Xu _{1,

2} , Xiao Wang _{1,

2} , Cheng Li _{1,

2} , Huaiyuan Wang _{1,

2}

Affiliation

Waterborne superhydrophobic coatings have attracted tremendous attention recently, but their practical applications are severely limited by hydrophobic instability and poor mechanical durability. Herein, a novel robust waterborne PTFE-CP&MgO-AOP superhydrophobic coating was successfully fabricated by reinforcing composite interfaces. Combined with the self-polymerization of dopamine and the in situ grown MgO, CNTs-polydopamine&MgO (CP&MgO) particles with improved interfacial compatibility were obtained. Through the cross-linking and hydrogen bonding interactions, phosphate networks (CP&MgO-AOP) with the aluminum orthophosphate (AOP) binder were formed during dehydration polymerization. The phosphate networks not only enhanced the interfacial interaction among CP&MgO to form coral-like structures but also strengthened the interfacial binding force between the waterborne polytetrafluoroethylene (PTFE) coating and the substrate. With the enhanced composite interfacial strength, the waterborne PTFE-CP&MgO-AOP coating exhibited excellent wear-resistance, which can withstand more than 1.27 × 10⁵ abrasion cycles. Moreover, the chemical bonding between the functional groups of phosphate networks and metal substrate improved the adhesion strength from grade 5 to 1. Furthermore, the prepared coating surface with the reticular/coral-like composite structures can lock the stable gas layer to maintain excellent hydrophobic stability, even under the conditions of strong acidic/alkaline, high-temperature, xenon lamp irradiation, and mechanical wear. Thus, this study is expected to open new insights into interfacial enhancement of robust waterborne superhydrophobic coatings.

中文翻译：

具有增强型复合界面的坚固的水性超疏水涂料

水性超疏水涂料近来引起了极大的关注，但是其实际应用受到疏水不稳定性和差的机械耐久性的严重限制。本文中，通过增强复合材料界面成功地制备了新型的坚固的水性PTFE-CP＆MgO-AOP超疏水涂料。结合多巴胺的自聚合和原位生长的MgO，获得了界面相容性得到改善的CNTs-polydopamine＆MgO（CP＆MgO）颗粒。通过交联和氢键相互作用，在脱水聚合过程中与正磷酸铝（AOP）粘合剂形成了磷酸盐网络（CP＆MgO-AOP）。磷酸盐网络不仅增强了CP＆MgO形成珊瑚状结构，但也增强了水性聚四氟乙烯（PTFE）涂层与基材之间的界面结合力。随着增强的复合材料界面强度，水性PTFE-CP＆MgO-AOP涂层表现出优异的耐磨性，可以承受1.27×10以上^5个磨蚀循环。此外，磷酸盐网络的官能团与金属基材之间的化学键合使粘附强度从5级提高到1级。此外，制备的具有网状/珊瑚状复合结构的涂层表面可以锁定稳定的气体层，以保持优异的疏水性即使在强酸/强碱，高温，氙灯辐射和机械磨损的条件下也能保持稳定。因此，该研究有望为增强水性超疏水涂料的界面增强提供新的见解。

更新日期：2020-10-21

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