Belarusian State Technological University, Minsk, Belarus:

N. R. Prokopchuk, Professor at the Department of Polymer Composite Materials, Doctor of Chemical Sciences, Associate Member of the National Academy of Siense Belarus, e-mail: nrprok@gmail.com

A. Yu. Klyuev, Professor at the Department of Woodworking Production, Doctor of Technical Sciences, e-mail: tnsippm@belstu.by
I. O. Laptik, Engineer at the Department of Polymer Composite Materials, e-mail: inna.laptik@yandex.ru

Empress Catherine II Saint Petersburg Mining University, Saint Petersburg, Russia:
A. G. Syrkov, Professor at the Department of General and Technical Physics, Doctor of Technical Sciences, e-mail: syrkovandrey@mail.ru

Non-toxic epoxides have been developed for metal protection on the basis of ED-20 resin and a new hardener – rosin-terpene-styrene-maleic adduct (KTSMA), obtained from renewable plant materials. DEG-1 plasticizer in the amount of 7% of the resin weight was introduced into the resin-hardener composition to raise the resistance of cured resin to impact loads. The KTSMA hardener contains functional anhydride and carboxyl groups, which should interact with epoxide and hydroxyl groups of the epoxy resin to form a spatial cross-linked coating structure. ED-20-based steel coatings cured with toxic tetraethylenepentamine (TEPA) have slightly better physical and mechanical properties compared with coatings cured with KTSMA. Thus, the former have higher hardness – 0.30 rel. units vs. 0.20 rel. units, and better adhesion – 3 points versus 4 points. This may be due to a much larger volume of KTSMA molecules compared with TEPA molecules, which reduces the density of the cross-linked spatial structure of the coatings. To raise the resistance to mechanical impacts and chemically aggressive environments, the coatings were modified with nanoparticles of various nature, including oxides of non-ferrous metals (TiO₂ and ZnO). It was established that through nanomodification of the developed compositions with TiO₂ and ZnO nanoparticles and impact-resistant diamonds (UDA SP, ShA-A) in ultra-small amounts (0.005; 0.010; 0.020 % wt.), one can achieve a significant improvement in the performance of anti-corrosion coatings. The authors hypothesize that a supramolecular structure is created in the developed coatings, which looks like interpenetrating networks. Functional polar groups and their uncompensated electric charge are present on the surface of nanoparticles, which actively interact with oligomeric molecules of the epoxy resin through its functional epoxide and hydroxyl groups forming a spatial system of physical bonds, additional to the chemical bonds of the KTSMA hardener with epoxy resin molecules. The physical bonding between the functional groups of epoxy resins and nanoparticles was proved by a rising dynamic viscosity on a Brookfield DV-II + Pro ES-DEG-1 rotary viscometer resulting from the introduction of the studied nanoparticles into the epoxy resin. The increase in viscosity is significant: from 15 to 25–29 mPa·s.

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