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Sunday, 15 September 2019
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Raw materials & technologies, Raw materials, Coatings pigments

Synthesising local clay-titanium dioxide core-shell extender pigments

Wednesday, 28 September 2016

A simple chemical technique has been used to prepare core-shell extender pigments based on Nigerian indigenous clays as core and titanium dioxide as shell.

Synthesis and characterisation of local clay-titanium dioxide core-shell extender pigments. Source: Jens Hasler/pixelio.de

Synthesis and characterisation of local clay-titanium dioxide core-shell extender pigments. Source: Jens Hasler/pixelio.de

The prepared core-shell extender pigments were characterised using X-ray fluorescence and scanning electron microscopy. The physico-chemical properties of these extender pigments were also evaluated according to ASTM measurements.

Nontoxic and environmentally friendly

The study showed that the prepared core–shell pigments were nontoxic and environmentally friendly. They are of low cost and can be incorporated in semi-gloss paints, paper, rubber, and plastic composites without much effect on the volume. The characteristics of these pigments showed that they combine the properties of both their precursors, and have the potential to overcome their disadvantages, e.g., low hiding power of clays and photochemical activity of titanium dioxide.

The study is published in: Journal of Coatings Technology and Research, September 2016, Volume 13, Issue 5, pp 931-940.

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Substituting titanium dioxide by calcium carbonate

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