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Monday, 16 September 2019
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Raw materials & technologies, Raw materials, Coatings pigments

Coatings pigments: Scattering and rheology of polymer-stabilised titanium dioxide dispersions investigated

Monday, 3 June 2013

Many paint properties, like opacity, gloss, stability and colour acceptance, depend on the quality of pigment dispersions. 

Polymer-stabilised titanium dioxide dispersions were analysed referring to their shear rate-dependent structure 

Source: Crenox

Polymer-stabilised titanium dioxide dispersions were analysed referring to their shear rate-dependent structure 

Source: Crenox

Dow Chemical Company (USA) has investigated polymer-stabilised titanium dioxide (TiO2) dispersions related to their shear rate-dependent structure. Two different molecular weight (MW) polyacid dispersants and two different MW acrylate copolymers were used in this study. The experiments were conducted at the NIST Center for Neutron Research on the crystal diffractometer for ultra-high resolution small-angle neutron scattering (USANS) measurements.

The results for TiO2 scattering and rheology showed that shear induced dissociation occurs for certain dispersants and shear induced association of TiO2clusters is observed for other dispersants. The results suggest new ways to consider dispersant selection for paints and the quality of pigment dispersions.

This study was published in: Journal of Coatings Technology and Research, May 2013, Volume 10, Issue 3, pp 297-303.

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