[article]
| Titre : |
Titanium dioxide pigment post-treatment : influence on electrostatic stability of technical dispersions |
| Type de document : |
texte imprimé |
| Auteurs : |
Daniel Liu, Auteur ; Daniel Moog, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 35-37 |
| Langues : |
Américain (ame) |
| Catégories : |
Colorants
Dioxyde de titane
Dispersions et suspensions
Pigments
|
| Index. décimale : |
668.3 Adhésifs et produits semblables |
| Résumé : |
The surface chemistry of titanium dioxide dispersions can be controlled via specialized measurements to reduce agglomeration.
Titanium dioxide (TiO2) can be used as a pigment base in applications such as coatings, plastics, and laminates. No matter the application, it is important to avoid the coagulation and agglomeration of the TiO2 dispersion during both the pigment production process and the end-use manufacturing process.
The surface chemistry of TiO2 dispersions can be controlled through the measurement of electrokinetic-sonic-amplitude (ESA) by regulating the pH value (e.g., for avoiding flocculation of the dispersion). This means that the zeta potential of the dispersion should not be or close to zero. Zeta potential is a dimension of the effective surface charge of particles and the interaction between the particles with ions in solution and particles among each other.
Characterizing the absolute surface charge (in an aqueous dispersion) of the TiO2 pigment, negative or positive in the unit (mV), gives a decisive parameter for the ultimate application of the product. The zeta potential depends on the kind of solvent, the nature and amount of the ions in solution (specific conductivity), and the pH value. It is also the main factor that determines the stability of the whole dispersion. |
| Note de contenu : |
- Testing materials and procedure
- Results and discussion
- Specialized measurement
- Fig. 1 : ESA results : TiO2-pigment surface charge properties control, measure and understanding |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34652 |
in ADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 27, N° 7 (07/2020) . - p. 35-37
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Titanium dioxide pigment post-treatment : influence on electrostatic stability of technical dispersions in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 27, N° 7 (07/2020)
