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Thursday, 27 February 2020
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Raw materials & technologies, Technologies

Studying dispersion quality of nanoparticles into a bio-based coating

Monday, 1 February 2016

The aim of a study was to improve performance of a vegetable oil-based coating with addition of nanoparticles.

The addition of 1% nanoparticles significantly increased the abrasion resistance of the modified coating. Source: fafoutis/Fotolia.com

The addition of 1% nanoparticles significantly increased the abrasion resistance of the modified coating. Source: fafoutis/Fotolia.com

Uniform distribution of added nanoclay, nanosilica and nanoalumina is the key to ensure the increased abrasion resistance. A high speed mixer, bead mill and ultrasonic mixer were used to disperse the nanoparticles into coatings. The quality of nanoparticle dispersion in liquid coating was studied by dynamic light scattering (DLS), and in dry film by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and time-of-flight secondary ion mass spectrometry (ToF-SIMS).

Nanoparticles improve abrasion resistance

Using a high-speed mixer with addition of glass beads resulted in exceptional dispersion of nanoparticles in coating as confirmed by the above techniques. Although, addition of nanoclay had a positive effect on drying time of coating (reducing it by 37%), it had negative effects on viscosity (increasing it by 5 times). Overall, addition of 1% nanoparticles significantly increased the abrasion resistance of modified coating after 2000 abrasion cycles in comparison with pure unmodified coatings as applied on larch wood flooring samples.

The study is published in: Progress in Organic Coatings, Volume 89, December 2015, Pages 246–251

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