Stabilisation of titania pigment particles with anionic polymeric dispersants

Saeed Farrokhpay, Gayle Morris, Daniel Fornasiero, Peter Self

    Research output: Contribution to journalArticlepeer-review

    39 Citations (Scopus)

    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.

    Original languageEnglish
    Pages (from-to)143-150
    Number of pages8
    JournalPowder Technology
    Volume202
    Issue number1-3
    DOIs
    Publication statusPublished - Aug 2010

    Keywords

    • Dispersion
    • Paint gloss
    • Rheology
    • Surface roughness
    • Titanium dioxide

    Fingerprint Dive into the research topics of 'Stabilisation of titania pigment particles with anionic polymeric dispersants'. Together they form a unique fingerprint.

    Cite this