Developing powder coatings with montmorillonite clays as flame retardants
Powder coatings have been receiving attention because they do not contain solvents and the components have decorative and corrosion-protection functions. However, the presence of polymers in their composition increases the risk of combustion in adverse situations.
In this context, a study aims to develop and characterise acrylic-based powder paints with the addition of 2 wt % and 4 wt % montmorillonite clays (MMT) as Cloisite 30B (MMT-30B) and Cloisite 15A (MTT-15A), employed as flame retardants.
Application on carbon steel substrates
The characterisation of the coatings was carried out by thermogravimetric analysis (TGA), X-ray diffraction, and scanning electron microscopy. After application of the coatings on carbon steel substrates, flammability tests were performed. The coatings with 2 wt % MMT-30B showed overall better results, especially in the flammability tests. Flames spread less on these coatings than on the other systems. However, when the surface and bottom temperatures were analysed by the cone calorimeter test, the samples prepared with 4 wt % MMT-15A were considered safer to be applied in fire scenarios.
The study is published in: Appl. Polym. Sci. 2017, 134, 45031.
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