Influence of PVA and CMC on the Properties of Pigment Coating Colors and their Effects on Curtain Stability
| Autor: | Hye Jung Youn, Chae Hoon Kim, Hak Lae Lee, Eun Heui Choi |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Environmental Engineering
Materials science Depletion flocculation lcsh:Biotechnology Bioengineering engineering.material Polyvinyl alcohol Curtain coating Gelling Viscosity chemistry.chemical_compound Adsorption Rheology Coating CMC lcsh:TP248.13-248.65 Zeta potential medicine GCC Composite material Waste Management and Disposal Curtain stability Carboxymethyl cellulose chemistry PVA engineering Clay medicine.drug |
| Zdroj: | BioResources, Vol 10, Iss 4, Pp 7188-7202 (2015) |
| ISSN: | 1930-2126 |
| DOI: | 10.15376/biores.10.4.7188-7202 |
| Popis: | The influence of polyvinyl alcohol (PVA) and carboxymethyl cellulose (CMC) on the properties of ground calcium carbonate (GCC) and clay coating colors, as well as its effect on curtain stability during the coating process was investigated. Based on the experimental results of the zeta potential, sediment porosity, rheological measurements, the floc formation mechanisms of the cobinders were proposed. The zeta potential decreased with an increase in the amount of added PVA, while it barely changed when CMC was added. This was attributed to the adsorption of PVA onto the pigment surface, while the adsorption of CMC was hindered by electrostatic repulsion. CMC cobinder increased the low-shear viscosity, but it resulted in relatively low viscosity under high-shear conditions, indicating the disruption of the formed flocs under high shear. The destabilization mechanism of the curtain coating differed depending on the type of cobinder. The PVA cobinder flocculates the coating color via a gelling mechanism, while the CMC cobinder flocculates the colors via a depletion flocculation mechanism. |
| Databáze: | OpenAIRE |
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