FORMATION OF POWDER COATING PROPERTIES IN THE SYSTEM "FILM-FORMING ‒ CROSS-LINKING AGENT"

Abstract

The results of the influence of film formers of different types on the formation of the properties of powder paints and coatings based on them was showed. Powder coating are one of the most promising types of paints and varnishes for industrial use. Their main advantages are the absence of solvents, virtually waste-free coating technology (the degree of utilization of the powder in the application is close to 100 %), relative simplicity and efficiency in the production process of the coating. As a result of study it has been revealed that the use of powder coating systems of different chemical nature provides higher physical and mechanical characteristics of coatings in comparison with traditional systems based on liquid acrylic resin, which in its turn allows to consider such systems as an alternative for protection of construction metal products and structures against the mechanical influences. At the same time, it has been shown that a change in the film former and crosslinking agent in the composition of powder systems differently influences the formation of powder coating properties depending on the type of the film former and its characteristics (viscosity, glass transition temperature) as well as the type of the crosslinking agent. The use of systems "polyester film forming – TGIC", "polyester film forming – НАА" provide high physical and mechanical properties of coatings without deterioration of technological properties of systems, when using film forming with dynamic Brookfield viscosity values within 30oC). In turn, the decrease of the glass transition temperature index and the increase of the resin viscosity index negatively affect the formation of the technological properties of the powder systems and, accordingly, the physical and mechanical characteristics of the coating.