Features of the Rebinder effect in nanomodified epoxy coatings

For the first time, we have established the features of the Rebinder effect in a cross-linked epoxy matrix containing ultra-small amounts (0.005–0.1 wt. %) of UDA SP, ASH-A, TiO2, ZnO, Al2O3, SiO2 nanoparticles. The waterinduced adsorption reduction of impact strength and hardness of nanomodified coatings on steel was evaluated in comparison with non-modified coatings. The proposed mechanism for the reduction of the Rebinder effect by nanoparticles is as follows. As a result of the interaction of electric charges on the surface of nanoparticles with the dipoles of polar epoxy and hydroxyl groups in the macromolecules of epoxy resin, Van der Waals forces form in addition to the existing cross-linking chemical bonds of the hardener. As a result, an interpenetrating network-type system is formed. The mobility of the macromolecule segments between cross-link nodes is reduced, and the energy barrier for bond rupture in epoxy resin macromolecules increases. The impact strength and hardness of coatings increase. A correlation has been established between the degree of compensation for the Rebinder effect and the magnitude of the electric charge on the nanoparticle surface. Thus, the nanomodification of epoxy coatings with even ultra-small amounts of nanoparticles (0.005 wt. %) makes it possible to significantly reduce the negative impact of the Rebinder effect caused by water. This is of great practical importance, since anti-corrosion coatings operated in the atmosphere are periodically exposed to precipitation.

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