| Titre : |
Pigment dispersion technology - Part II |
| Type de document : |
texte imprimé |
| Auteurs : |
Tipanna Melkeri, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 88-96 |
| Langues : |
Anglais (eng) |
| Catégories : |
Agents dispersants (chimie)
Dispersions et suspensions
Pigments
Polymères en émulsion
Surfactants
|
| Index. décimale : |
667.2 Colorants et pigments |
| Résumé : |
To formulate best pigment dispersion solution, one has to consider Dispersant, Grinding medium, Pigments/fillers, Order of addition and Surface area of pigment/filler. The choice of the dispersing agents is a key issue in the coating and ink industry. The role of the dispersing agents is to enhance the dispersion process and ensure a fine particle size in order to stabilize pigments in the resin solution. Dispersant can be Polymeric dispersant or Surfactants. The main differences of those two types of dispersants being the molecular weight, the stabilization mechanism and the resulting let down stability. Polymer dispersant has two parts polymer chain and anchoring group. Polymer chain must be compatible with resin system where as anchoring group should have affinity for pigments used. Anchoring can then take place through a variety of mechanisms. Based on resin system used in grinding the pigment the polymeric dispersant is very important. The choice of dispersant is also related to the surface nature of the pigment specially the anchoring group. The surface area of the pigment also affects the level of dispersant used, and in general, if too little is used then the full benefits will not be realized. |
| Note de contenu : |
- INTRODUCTION : Dispersant
- POLYMERIC DISPERSANTS : Polymeric chain - Anchoring group
- ANCHORING MECHANISMS : Anchoring through ionic or acidic/basic groups - Anchoring through hydrogen-bonding groups - Anchoring through polarizing groups - Anchoring through solvent-insoluble polymer blocks
- PIGMENT SYNERGIST
- II SURFACTANTS : Fatty acid derivatives - Phosphate ester - Sodium polyacrylates/polyacrylic acid - Acetylene diols - Soya lecitin
- Fig. 1 : Various possible arrangement of polymer and anchor group
- Fig. 2 : Anchoring through acid or basic group
- Fig. 3 : Arrangement polar and non polar chain/groups in media
- Fig. 4 : Anchoring by hydrogen bonding to a polymeric group
- Fig. 5 : Anchoring through polarizing groups
- Fig. 6 : Anchoring through solvent insoluble polymer blocks
- Fig. 7 : Pigment synergist with anchoring group
- Fig. 8 : Type of surfactants
- Fig. 9 : Typical structure of ethoxylated acetylene diol
- Fig. 10 : Effect of level of dosages of dispersants |
| En ligne : |
https://drive.google.com/file/d/1I76C2psUf4jbHHKpckvPo_uen7ngtgBC/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35204 |
in PAINTINDIA > Vol. LXX, N° 12 (12/2020) . - p. 88-96
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Pigment dispersion technology - Part II in PAINTINDIA, Vol. LXX, N° 12 (12/2020)
