Titre : |
Design of pigment dispersants for high-performance applications |
Type de document : |
texte imprimé |
Auteurs : |
Andrew Shooter, Auteur ; Tom Annable, Auteur ; Stuart Richards |
Année de publication : |
2018 |
Article en page(s) : |
p. 26-30 |
Langues : |
Anglais (eng) |
Catégories : |
Agents dispersants (chimie) Anticorrosifs Anticorrosion Dioxyde de titane Dispersions et suspensions Epoxydes Essais accélérés (technologie) Essais de résilience Oxyde de fer Pigments inorganiques Revêtements bi-composant Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs
|
Index. décimale : |
667.9 Revêtements et enduits |
Résumé : |
With increasing regulatory and environmental requirements, there is a drive towards developing water-based VOC free pigmented coating formulations with the same aesthetic properties as solvent-based systems. The pigment dispersant in addition to providing fast wetting and desirable colouristic effects will also impact the overall durability of the coating. Novel anchor groups have enabled us to design improved dispersants, which can be formulated into coatings with superior jetness and colour strength. These dispersants can reduce the particle size in much less time than conventional dispersants using less energy during the milling process while providing the required stability and compatibility in the coating formulation. In addition, through efficiency in design coupled with judicious selection of stabilising chains, the dispersant can be optimised to minimise its impact on water sensitivity and corrosion resistance.
After proving that these principles deliver superior dispersants on organic pigments and carbon black, our recent focus has been to deliver the same benefits on high end inorganic pigments for industrial applications, such as transparent iron oxides. In this paper, we will discuss these design principles and show how this has translated into superior performance in waterborne industrial coatings. |
Note de contenu : |
- Dispersion of transparent iron oxides
- Dispersion of titanium dioxide
- FIGURES : 1. Optimising the dosage of a dispersant and the relationship to flocculation - 2. Classification of dispersants - 3. Dispersion of high surface area carbon black pigment with SA dispersant - 4. Developing an effective MA dispersant and impact on millbase viscosity - 4A : Carbon black dispersion gloss and colour strength when let down into an industrial white base - 4B. Pigment yellow 42 gloss and colour strength when let down into an industrial white base - 5. SEM images of transparent iron oxides. Yellow iron oxide and red - 6. Millbase viscosity and particle size at different concentrations of transparent iron oxide - 7. Transparent iron oxide millbase viscosity and particle size at different loadings of dispersant - 8. Opacity of yellow iron oxide dispersions in an automotive clear coat vs milling time - 9. Particle size distributions of pigment dispersion during the milling process - 10. Relationship between particle size and opacity for yellow iron oxide dispersion - 11. Dispersion of TiO2 with MA dispersant vs competitive controls - 12. Performance of MA dispersant on TiO2 pigments - 13. Top : Corrosion testing of TiO2 dispersion in acrylic coating. Corrosion testing of titanium dioxide dispersion in 2K epoxy coating |
En ligne : |
https://drive.google.com/file/d/1LK7BYCe6RuKv0-sshcv8uZlAneuTPHTl/view?usp=drive [...] |
Format de la ressource électronique : |
Pdf |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31021 |
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 208, N° 4644 (09/2018) . - p. 26-30