| Titre : |
Developing colour to its full potential : The author discusses novel dispersants for optimum pigment dispersions |
| Type de document : |
texte imprimé |
| Auteurs : |
Loulou Rozek, Auteur |
| Année de publication : |
2017 |
| Article en page(s) : |
p. 22-26 |
| Langues : |
Anglais (eng) |
| Catégories : |
Agents dispersants (chimie)
Pigments
|
| Index. décimale : |
667.2 Colorants et pigments |
| Résumé : |
The automotive and performance coatings industries have seen a significant shift from solvant to waterborne systems in recent years. This change has brought challenges to paint formulators. One of those challenges is producing colours ta match those of solvent systems in vibrancy and undertones, particularly with low surface functionality pigments such as perylene, phthalocyanine blues and high jet carbon black pigments. To overcome those challenges, novel dispersants with unique structure and chemistry have been developed to produce better colour performance and jetness than ever before in waterborne coatings. Understanding the relations between the dispersant's chemistry, structure and affinity to organic pigment surface will help the formulator net only optimise colour performance but also understand and control other parameters that are key to production efficiency, such as grind lime (energy) and grind viscosity (pigment loading). |
| Note de contenu : |
- Structure of dispersants
- Case study : PR 179
- Viscosity and viscosity stability
- Case study : PBK7
- FIGURES : 1. Typical structures of polymeric dispersants - 2. Interaction of dispersant's polar groups with pigment surface polar sites - 3. Pigments with low surface functionalities - 4. Novel dispersants unique structure - 5. The electron rich body of novel dispersants creates a strong interaction with pigment surface - 6. Particle size of novel dispersant against benchmark - 7. Hunter L*a*b* values novel dispersant and benchmark - 8. PR 179 colour development over time with Disp. 1 and Disp. 2 - 9. Disp. 2 has higher gloss : at 0.5hr than Disp. 1 at four hr - 10. Viscosity initial and one month at RT - 11. Mean particle size over time and jetness over time - 12. 20° gloss and haze - 13. Three step viscosity (cPs)
- TABLES : 1. Concentrate formulation, benchmark (Disp. 1) and novel dispersant (Disp. 2) - 2. Let-down in WB 2K PU systems - 3. Concentrate formulation, benchmark (Disp. 1) and novel dispersant (Disp. 2) - 4. Let-down in WB 2K PU system - 5. Jetness values for four PBK 7 |
| En ligne : |
https://drive.google.com/file/d/1dh8chW48B9h7kwmffxg8a3-Lr5oMstJT/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28849 |
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 207, N° 4633 (08/2017) . - p. 22-26
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Developing colour to its full potential in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 207, N° 4633 (08/2017)
