Polímeros: Ciência e Tecnologia
https://app.periodikos.com.br/journal/polimeros/article/doi/10.1590/0104-1428.01616
Polímeros: Ciência e Tecnologia
Original Article

Effect of addition of clay minerals on the properties of epoxy/polyester powder coatings

Natanael Relosi; Oscar Almeida Neuwald; Ademir José Zattera; Diego Piazza; Sandra Raquel Kunst; Eliena Jonko Birriel

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Abstract

Abstract: Powder coatings have been used for coating metal substrates in industrial applications. The incorporation of nanofillers as muscovite mica and montmorillonite (MMT) can improve the properties of the coatings. The objective of this study is to develop, apply and characterize a hybrid powder coating (30% epoxy/70% polyester) adding nanofillers in concentrations of 2, 4 and 6 phr separately in a twin screw extruder. The characterization of the coatings was performed by thermal, mechanical and chemical analysis. The incorporation of clay into the polymer increased the surface roughness resulting in a diffuse reflection of incident light and on a gloss reduction. The muscovite mica presented a lamellar structure, constituted by a set of overlapping parallel plates. The morphology analysis showed that the MMT presented irregular agglomerates resulting in inferior mechanical properties to coatings with muscovite mica. In the salt spray test, all samples showed high corrosion protection, around 850 hours.

Keywords

epoxy/polyester resin, montmorillonite, muscovite mica, powder coating

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