| Titre : |
Pigment dispersion technology Part I |
| Type de document : |
texte imprimé |
| Auteurs : |
Tipanna Melkeri, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 71-74 |
| Langues : |
Anglais (eng) |
| Catégories : |
Dispersions et suspensions
Mouillage (chimie des surfaces)
Pigments
Stabilisants (chimie)
|
| Index. décimale : |
667.2 Colorants et pigments |
| Résumé : |
Pigment dispersion process take place in three steps. I) Wetting, II) Dispersion and III) Stabilisation. Wetting of solid surface can be defined as uniform spreading of liquid on sol id surface. When contact angle of liquid phase with sol id particle is zero then it is said to be completely wetted and hence monolayer of liquid on the sol id surface is formed. To have better wetting HLB value of liquid phase should be comparable with HLB value of pigments. HLB value of liquid phase can be adjusted by adding suitable. In th is step breaking of agglomerates into fi ner particles occurs. Two principles are used to split agglomerates into smaller pieces are shear action and impact action. The disperse particles are in the state of higher energy, the primary particles have a tendency to re-agglomerate. This process is called flocculation. Particles that have been separated from each other must be stabilized to prevent flocculation. Therefore, immediately alter grinding pigment suspensions must be stabilized by the addition of additives. Stabil ization is achieved through absorption of stabil izing molecules on the pigment surface. Therefore, there are two principal mechanisms for the stabil ization of pigmented dispersions namely electrostatic stabilisation and Steric stabilisation. |
| Note de contenu : |
- INTRODUCTION : 1) Wetting process
- THERMODYNAMIC BEHIND WETTING PROCESS : Dispersion (size reduction) - Stabilisation - Colloidal stabilisation - Electrostatic stabilisation - Steric stabilisation |
| En ligne : |
https://drive.google.com/file/d/1IGOmbnJl2nDVsdOTaVO_4U0GO0_xp4I3/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35194 |
in PAINTINDIA > Vol. LXX, N° 11 (11/2020) . - p. 71-74
Aller sur edunet
Accueil
Pigment dispersion technology Part I in PAINTINDIA, Vol. LXX, N° 11 (11/2020)
