Waterborne Epoxy Resin/Polydopamine Modified Zirconium Phosphate Nanocomposite for Anticorrosive Coating

Abstract

Replacing solvent-based coatings with waterborne resin ones has become an overall trend in the coating industrial to reduce pollution caused by volatile organic compounds. It is known that introduction of flexibly designable two-dimensional nanoplatelets or zirconium phosphate (ZrP) can improve the mechanical and barrier properties of a film from solvent-based coatings. In this work, we have designed a methodology to prepare nanocomposites for waterborne coating, which consist of waterborne epoxy resin (WER) and polydopamine modified ZrP (PDA-ZrP). It is found that PDA-ZrP has excellent compatibility with WER, and consequently, the film defects of pure WER are fixed. The PDA-ZrP/WER coating exhibits an extremely low corrosion current (1.09 × 10–9 A cm–2) at 1.0% PDA-ZrP loading. It is about 500 times lower than that of the pure WER coating (5.82 × 10–7 A cm–2), and consequently, the same coating has a much smaller rusted area after a salt spray test of 310 h. It should also be noted that all materials we used are eco-friendly, and all experimental procedures are conducted under mild conditions.

Laboratory evaluation on water-based and flexible epoxy/SiO₂ nanocomposites to enhance anti-sliding effectiveness of pavement

“…emulsifier or grafting hydrophilic groups to epoxy [16,17]. Contradictorily, the existence of the emulsifier or hydrophilic group increases water absorption of WER cured films, and this results in the weakening of the bond strength between the substrate interface [18][19][20]. In order to solve this dilemma, the curing agents with the ability of emulsifying epoxy resin were developed.…”

High-Strength GO/PA66 Nanocomposite Fibers via In Situ Precipitation and Polymerization

“…As shown in Figure 7 a, the N 1s spectra of the PA66-gGO can be deconvoluted into C−N and N−H components at binding energies of 399.4 and 401.6 eV, respectively, which further confirms that PA66 was grafted onto the surface of the GO through amide bonds [ 41 ]. From Figure 7 b,c, the C 1s peaks of the PA66-gGO and GO can be deconvoluted into three peaks with binding energies of 284.6, 285.5, and 289.1 eV, which are assigned to C=C, C−C, and O−C [ 42 ]. We know that the grafted PA66 via amine bond leads to an increase in the C=O content in GO which could be revealed by XPS analysis [ 43 ].…”

Enhanced anti‐aging and anti‐corrosion performance of waterborne epoxy coating layers over the dual effects of g‐C3N4 photocatalysis

“…Metal corrosion has aroused numerous safety, 1 environmental 2 and economic issues 3 . The utilization of active metal and anti‐corrosion coating layers has been demonstrated to be an effective approach to suppress metal corrosion 4,5 .…”