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.
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