| Titre : |
Hydrophobically modified hydroxyethyl cellulose (hmHEC) - effective low-shear viscosity builder for latex paints |
| Type de document : |
texte imprimé |
| Auteurs : |
Artur Palasz, Auteur |
| Année de publication : |
2022 |
| Article en page(s) : |
p. 40-42 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Concentration pigmentaire volumique
Epaississants
Formulation (Génie chimique)
Hydrophobie
hydroxyéthylcellulose
Revêtements -- Additifs:Peinture -- Additifs
Stabilité au stockage
Viscosité
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Cellulose thickeners are the basic group of rheological modifiers ensuring the viscosity of dispersion paints in the low-shear (Brookfield) and mid-shear forces (Stormer) area. They provide resting viscosity and allow the paint structure to be rebuilt after application to the substrate at higher shear rates (e.g. roller), preventing sagging. Standard grades of hydroxyethyl cellulose as paint thickeners are common and used in both high and low PVC (pigment volume concentration) latex paint formulations. In low-cost contractor's dispersion paints with very high PVC (e.g. ceiling paints), HEC also acts as a binder supporting the binding of pigments and fillers. Unfortunately, typical HEC thickeners do not allow for non-spattering properties when painting with a roller, and such a feature is extremely desirable for the paint market, especially where interior painting is performed by non-professional painters. The solution to this problem cornes with hydrophobically-modified HEC thickeners, the effectiveness of which will be discussed in this article. |
| Note de contenu : |
- From cellulose to cellulose derivative thickeners
- Experimental
- Test results and discussion : Viscosity - Sagging - Spattering - Storage stability
- Table 1 : Formulation used in case studies of HEC/hmHEC thickeners
- Table 2 : Test result and anti-sag index
- Fig. 1 : Examples of reaction mechanisms for the formation of cellulose derivatives as thickeners
- Fig. 2 : Examples of cellulose ether substitutions
- Fig. 3 : Structure of hydrophobically-modified HEC |
| En ligne : |
https://drive.google.com/file/d/1Rf589j_UyoPk6uGBRKfO7KeA9v-AH23W/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37872 |
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 212, N° 4676 (08/2022) . - p. 40-42
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Hydrophobically modified hydroxyethyl cellulose (hmHEC) - effective low-shear viscosity builder for latex paints in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 212, N° 4676 (08/2022)
