Lin Dan, Zhang Xiguang, Yuan Sicheng, Li Yuan, Xu Fei, Wang Xiao, Li Cheng, Wang Huaiyuan
School of Chemical Engineering and Technology and State Key Laboratory for Chemical Engineering, Tianjin University, Tianjin 300350, PR China.
Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, PR China.
ACS Appl Mater Interfaces. 2020 Oct 21;12(42):48216-48224. doi: 10.1021/acsami.0c14471. Epub 2020 Oct 13.
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 × 10 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.
水性超疏水涂层近年来引起了极大关注，但其实际应用受到疏水稳定性差和机械耐久性不佳的严重限制。在此，通过增强复合界面成功制备了一种新型的坚固水性聚四氟乙烯 - CNTs - 聚多巴胺&氧化镁 - 磷酸铝（PTFE - CP&MgO - AOP）超疏水涂层。结合多巴胺的自聚合和原位生长的氧化镁，获得了界面相容性得到改善的碳纳米管 - 聚多巴胺&氧化镁（CP&MgO）颗粒。通过交联和氢键相互作用，在脱水聚合过程中形成了具有磷酸铝（AOP）粘合剂的磷酸盐网络（CP&MgO - AOP）。磷酸盐网络不仅增强了CP&MgO之间的界面相互作用以形成珊瑚状结构，还增强了水性聚四氟乙烯（PTFE）涂层与基材之间的界面结合力。随着复合界面强度的增强，水性PTFE - CP&MgO - AOP涂层表现出优异的耐磨性，可承受超过1.27×10次磨损循环。此外，磷酸盐网络官能团与金属基材之间的化学键将附着力强度从5级提高到1级。此外，所制备的具有网状/珊瑚状复合结构的涂层表面可以锁定稳定的气体层，即使在强酸性/碱性、高温、氙灯照射和机械磨损条件下也能保持优异的疏水稳定性。因此，本研究有望为坚固水性超疏水涂层的界面增强开辟新的思路。
