INCREASING THE RESISTANCE TO MECHANICAL INFLUENCES AND AGGRESSIVE ENVIRONMENTS OF EPOXY COATINGS WITH NANOPARTICLES OF DIFFERENT NATURE

UDC 678.06:544.72

 

Prokopchuk Nicolay Romanovich – Corresponding Member of the National Academy of Sciences of Belarus, DSc (Chemistry), Professor, Professor, the Department of Polymer Composite Materials. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: nrprok@mail.com

Klyuev Andrey Yur’yevich – DSc (Engineering), Professor, the Department of Woodworking Technology. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: andrey_kluev_bstu@mail.ru

Laptik Inna Olegovna – engineer, the Department of Polymer Composite Materials. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: inna.laptik@yandex.ru

 

DOI: https://doi.org/ 10.52065/2520-2669-2024-277-5.

 

Key words: : epoxy resin, hardener, plasticizer, nanodiamond particles, TiO2 and ZnO nanoparticles, adhesion, hardness, impact strength.

For citation: Prokopchuk N. R., Klyuev A. Yu., Laptik I. O. Increasing the resistance to mechanical influences and aggressive environments of epoxy coatings with nanoparticles of different nature. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2024, no. 1 (277), pp. 43–49 (In Russian). DOI: 10.52065/2520-2669-2024-277-5.

 

 

Abstract

Non-toxic epoxy compositions for anti–corrosion treatment of metals based on epoxy ED-20 resin and a new hardener – rosin terpenostyrene-oleic adduct (KTSMA), obtained from renewable vegetable raw materials, have been developed. To increase the resistance of the cured resin to shock loads, we introduce DEG-1 plasticizer in the resin-hardener composition in an amount of 7% by weight of the resin. The KTSMA hardener in its composition has functional anhydride and carboxyl groups necessary for interaction with epoxy and hydroxyl groups of epoxy resin to form a spatial cross-linked coating structure. To increase resistance to mechanical influences and chemical aggressive media, steel coatings are modified with nanoparticles of various nature: non-ferrous metal oxides TiO2, ZnO and ultrafine diamond UDA. It was found that nanomodification of the developed compositions with TiO2, ZnO nanoparticles and high-impact diamonds (UDA SP, ASH-A) in ultra-small quantities (0.005; 0.010; 0.020 wt. %), allows to significantly improve the performance properties of anticorrosive coatings. The hardness of the coatings increases from 0.2 rel. units to 0.71 rel. units at a content of 0.02 wt. % UDA; up to 0.80 rel. units. with a content of 0.005 wt. % TiO2 and 0.02 wt. % ZnO. The impact strength increases from 30 cm to 90 cm with the introduction of 0.01 wt. % UDA SP, 0005 wt. % TiO2, 0.02 wt. % ZnO. The adhesion of coatings improves from 4 points to 1 point with the introduction of 0.01 wt. % UDA SP, 0005 wt. % TiO2, 0.01 wt. % ZnO. According to the effectiveness of increasing the resistance of coatings to water and 3% aqueous sodium chloride solution, nanoparticles are located in the TiO2 > ZnO > UDA range. A hypothesis of the formation of the supramolecular structure of the developed coatings according to the type of interpenetrating grids is proposed. Nanoparticles, having functional polar groups and an uncompensated electric charge on their surface, actively interact with oligomeric epoxy resin molecules along its functional epoxy and hydroxyl groups, forming a spatial system of physical bonds additional to the chemical bonds of the KTSMA hardener and epoxy resin molecules. The formation of physical bonds between the functional groups of epoxy resin and nanoparticles is proved by an increase in dynamic viscosity on a rotary viscometer Brookfield DV-II+Pro epoxy resinDEG-1 rotary viscometer when the studied nanoparticles are introduced into the ES. The increase in viscosity is significant: from 15 to 25–29 MPa·s.

 

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15.11.2023