[article]
| Titre : |
Rheological assessments |
| Type de document : |
texte imprimé |
| Auteurs : |
Lisa M. Fine, Auteur ; Charles Palmer, Auteur |
| Année de publication : |
2008 |
| Article en page(s) : |
p. 39-42 |
| Langues : |
Anglais (eng) |
| Catégories : |
Dispersions et suspensions
Dynamique moléculaire
Encre
Éthoxylationalcools et phénols, généralement pour produire de puissants agents surfactants ou mouillants.
Pigments
Rhéologie
Solutions de polymère
Surfactants
Viscosité
|
| Index. décimale : |
668.1 Agents tensioactifs : savons, détergents |
| Résumé : |
In this paper, we assesse the effects of polymer/surfactant interactions in a pigmented water-based dispersionusing rheology, so, it was noted that :
1. Higher levels of ethoxylation led to much lower disper-sion and ink viscosities, and minimisation of pseudo-plastic behaviour.
2. Higher levers of ethoxylation led to higher polymer solution viscosities.
3. In general, with the exception of the octylphenol ethoxylates, more hydrophobie polymers and surfactants decreased the acrylic solution polymer viscosities to a greater degree, possibly due to a screening effect and conformational changes in the polymer.
4. For a given hydrophobe, higher ethoxylation levels led to lower viscosity and elasticity and generally higher print strength in inks.
5. Difunctional surfactants can lead to bridging effects, increasing polymer solution viscosities as well as dispersion and ink viscosities.
6. Lower dispersion viscosities allow for higher pigment loadings during manufacture.
7. Extensional properties have to be considered in the future to fully understand what is occurring.
The interactions between polymers, surfactants and pigments can be useful or detrimental to the characteristics of a formulation depending on its end use. Effects on rheology, adsorption at pigment/vehicle interfaces, and surface tension are common. Formulating with surfactant/polymer complexes that have the ability to nnodify the rheology of the system or enhance adsorption at the pigment surface can provide synergistic benefits. These will lead to better printability and press performance. |
| Note de contenu : |
- Polymer solutions
- Dispersion viscosities
- Dispersion colour development
- Ink study
- Rheometric evaluation |
| En ligne : |
https://drive.google.com/file/d/1ztT4ebR2of53rnHke03OzMR_Hc3EaQx6/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27173 |
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 198, N° 4527 (08/2008) . - p. 39-42
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Rheological assessments in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 198, N° 4527 (08/2008)
