Stabilisation of titania pigment particles with anionic polymeric dispersants

Saeed Farrokhpay, Morris, Gayle E., Fornasiero, Daniel and Self, Peter (2010) Stabilisation of titania pigment particles with anionic polymeric dispersants. Powder Technology, 202 1-3: 143-150. doi:10.1016/j.powtec.2010.04.031


Author Saeed Farrokhpay
Morris, Gayle E.
Fornasiero, Daniel
Self, Peter
Title Stabilisation of titania pigment particles with anionic polymeric dispersants
Journal name Powder Technology   Check publisher's open access policy
ISSN 0032-5910
1873-328X
Publication date 2010-08
Sub-type Article (original research)
DOI 10.1016/j.powtec.2010.04.031
Volume 202
Issue 1-3
Start page 143
End page 150
Total pages 8
Place of publication Lausanne, Switzerland
Publisher Elsevier S.A.
Language eng
Abstract The stabilisation of titania pigment in dry water-based paint films with anionic polymeric dispersants containing carboxylate groups was investigated. The results were compared to those obtained from rheological analysis of titania pigment suspensions. The polymeric dispersants chosen were polyacrylic acid and polyacrylamides copolymer modified with carboxylate groups. AFM and TEM were used to assess the distribution of the titania pigment particles in the surface and bulk, respectively, of the paint films which were then compared to the gloss and surface roughness of these films. In the absence of a dispersant, the pigment distribution in the paint films was not uniform and relatively large pigment aggregates appeared at the surface, resulting in a rough surface and low gloss. However, anionic polymeric dispersants decreased surface roughness and increased the gloss of the dry paint films, with the dispersant concentration considerably enhancing pigment distribution in the paint films. An inverse correlation of paint film gloss with surface roughness was observed. The optimum pigment distribution in the dry state was found at dispersant concentrations much higher than those needed to obtain minimum yield stress in aqueous suspensions. This suggests that in the dry state, electrostatic stabilisation is substantially reduced or possibly absent, therefore a higher dispersant concentration is needed to achieve pigment stabilisation.
Keyword Dispersion
Surface roughness
Rheology
Titanium dioxide
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Journal issue 25 August 2010-10 October 2010

Document type: Journal Article
Sub-type: Article (original research)
Collection: Julius Kruttschnitt Mineral Research Centre Publications
 
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Created: Mon, 22 Aug 2011, 11:48:19 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre