ВПЛИВ ПОЛІМЕРНИХ ПЛІВКОУТВОРЮВАЧІВ НА ВЛАСТИВОСТІ АНТИКОРОЗІЙНИХ ПОРОШКОВИХ ПОКРИТТІВ ДЛЯ ЗАЛІЗОБЕТОНУ

O.V., Lastivka; D.M., Samchenko; O.O., Tomin

doi:10.31713/budres.v0i49.09

Authors

O.V., Lastivka (Kyiv National University of Construction and Architecture) https://orcid.org/0000-0002-3670-0020
D.M., Samchenko (Kyiv National University of Construction and Architecture) https://orcid.org/0000-0003-3305-8180
O.O., Tomin (Kyiv National University of Construction and Architecture) https://orcid.org/0000-0002-2830-9419

DOI:

https://doi.org/10.31713/budres.v0i49.09

Abstract

reinforced concrete structures; corrosion; powder coating materials; thermoplastic polymers; adhesion; molecular weight.

The article is devoted to the study of the influence of the chemical structure and molecular weight of thermoplastic polymer film-formers on the physical and mechanical properties of powder coatings intended for the anti-corrosion protection of reinforced concrete structures. Reinforced concrete remains the most widespread building material globally due to its technological advantages, but it is highly susceptible to corrosion under aggressive environmental influences. Because concrete has a porous structure, corrosion processes propagate deep into the composite, making impermeability a crucial factor for durability. This necessitates the use of secondary protection systems, such as polymer coatings, to create an effective barrier. Modern environmental standards and economic factors dictate a transition towards 100% solid powder coating materials, which align with the 4E principle (ecology, economy, energy saving, efficiency). The research evaluates a diverse range of thermoplastic polymers, including polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), polyethylene (PE), polypropylene (PP), nylon, and saturated polyesters. The film formation process was investigated by measuring the surface tension of polymer melts using a modified Wilhelmy method in an argon atmosphere, assessing the spreading of the adhesive on the substrate according to ISO standards, and determining mechanical adhesion via pull-off testing and impact resistance. The results demonstrate that increasing the molecular weight of the polymer generally increases the surface tension of the melt. This inhibits the initial coalescence of powder particles and reduces spreading on the substrate, consequently lowering the mechanical bonding strength. Among the evaluated polymers, PVDF with a molecular weight of 40,000 g/mol exhibited the optimal combination of rheological and mechanical properties, achieving an adhesion strength of 9.1 MPa and an impact resistance of 2.0 Nm. The exceptional high performance of PVDF is directly attributed to the extremely strong carbon-fluorine bonds (116 kcal/mol) inherent in its molecular structure. The study concludes that the efficiency of thermoplastic film-formers in powder coating systems generally increases in the following sequence: PP < Nylon < PE < PVC < Saturated Polyester < PVDF. These findings provide a scientific foundation for the rational selection of raw materials in the formulation of highly durable, eco-friendly protective coatings for reinforced concrete structures operating in severely aggressive environments

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