Abstract
The preparation of epoxy/clay nanocomposites (NCs) and their insertion into coatings are of great importance since the NCs could enhance the protective performances. In this study, epoxy NCs with 1–10 wt% of nanoclay Cloisite 30B (C30B) were prepared by the sonication-assisted solution method. The rheological measurements of epoxy/C30B suspensions revealed non-Newtonian, shear-thinning behavior of the uncured NCs, with an increase in the viscosity, yield stress, and shear modules with increasing organoclay content, while the dispersion effectiveness of C30B decreased. A significant enhancement of the rheological parameters was observed at the second percolation threshold (4.1 vol%) due to the formation of a continuous network of 45-layer-thick tactoids. Although NCs with 1–3 wt% C30B exhibited slightly reduced mechanical and adhesion properties compared with the cured reference epoxy resin, the epoxy primer and topcoat based on NC with 1 wt% C30B generally displayed improved impact resistance and maintained flexibility, pendulum hardness, and good adhesion properties. Two-layer coating systems, i.e., NC-based primers and topcoats, had higher corrosion stability in a salt spray chamber compared to the unmodified system.
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This work was partially financially supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia (Project Nos. 172062 and III 45019).
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Tomić, M.D., Dunjić, B., Bajat, J.B. et al. Anticorrosive epoxy/clay nanocomposite coatings: rheological and protective properties. J Coat Technol Res 13, 439–456 (2016). https://doi.org/10.1007/s11998-015-9762-4
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DOI: https://doi.org/10.1007/s11998-015-9762-4