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Saturday, 21 September 2019
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Raw materials & technologies, Technologies, Nanotechnology

Reducing the release of SiO2 nanoparticles from paint

Thursday, 30 January 2014

Waterborne paints with integrated nanoparticles have been recently introduced into the market as nanoparticles offer improved or novel functionalities to paints.

Nanoparticles can offer improved or novel functionalities to paints
Source: NJ - Fotolia.com

Nanoparticles can offer improved or novel functionalities to paints
Source: NJ - Fotolia.com

However, the release of nanoparticles during the life cycle of nano-enhanced paint has only been studied to a very limited extent. The paint composition could determine in what quantities and forms the nanoparticles are released.

SiO2 nanoparticles were found in some leachates

In this study, paint formulations containing the same amount of silicon dioxide (SiO2) nanoparticles but differing in the pigment volume concentration (PVC) and in amount and type of binder and pigment, were studied through leaching test to investigate the influence of these parameters on release of Si from paint. The results indicate greater release of Si, about 1.7 wt.% of the SiO2nanoparticles in the paint, for paint formulated with higher PVC value (63%), suggesting that the PVC is a crucial factor for release of SiO2nanoparticles from paints. This hypothesis was also based on the fact that agglomerates of SiO2 nanoparticles were only found in leachates from paint with higher PVC. A paint sample with the higher amount of binder and less calcite filler exhibited a lower release of Si among the paints with a low PVC value (35%), and no SiO2 particles were detected in leachates collected from this paint. This could be due to the fact that a high portion of binder forms a suitable matrix to hold the SiO2 ENPs in paint. The paint sample in which the amount of calcite was partially substituted with TiO2pigment did not show an important reduction on Si release.

Properties of binder and pigments should be adjusted 

In their work, the researchers from Venice Research Consortium, Italy, GFC Chimica, Italy, and CEA Commissariat à l'Energie Atomique et aux Energies Alternatives, France, suggest that paint debris containing SiO2nanoparticles may release a limited amount of Si into the environment, and that by adjusting the properties of the binder in combination with common pigments it is possible to reduce the release of SiO2 nanoparticles.

The study is published in: Science of The Total Environment, Volumes 476-477, 1 April 2014, Pages 298-307

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