[article]
| Titre : |
A novel approach to correlate permeability and porosity in latex coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Biman Ghosh, Auteur ; Tanmay Chattopadhyay, Auteur |
| Année de publication : |
2002 |
| Article en page(s) : |
p. 41-49 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Two significant factors affecting the performance of architectural water based paints are durability and appearance. Permeability and porosity are the responsible factors in the determination of durability and appearance of the coating. The role of PVC is singularly most important aspect in the determination of permeability and porosity. Problems with latex coatings are due to their high permeability which leads to defects such as efflorescence, which is the leaching out of the soluble salts from the substrate through the paint film, that affect gloss and produce patches on the paint film. A series of experiments were conducted to establish conclusively the effect of Pigment Volume Concentration (PVC) on porosity and on permeability to determine the product performance. Authors of the present paper have investigated the effect of film thickness on porosity and have established the correlation between porosity and permeability at various PVCs. The authors have also established that porosity do not vary with film thickness and porosity linearly increases with PVC showing a point of inflexion at the Critical Pigment Volume Concentration (CP VC). Actually, porosity at the paint surface does not change with film thickness, but increases with PVC as more porous pigment volume replaces less porous binder volume. However, permeability was found to increase with PVC till CPVC, after which it decreased. This is because the incorporation of hydrophilic pigment increases the fraction of film allowing water vapour transport, but above CPVC permeability decreases due to the barrier effect from the pigment. The plot of permeability with porosity was similar to the plot of permeability with PVC. |
| Note de contenu : |
- Principal model of permeation
- Water vapour permeability in pigmented film
- Experimental
- Determination of porosity of films
- Determination of permeability of paint film
- Porosity of paint at different wet film thickness (WFT)
- Permeability of paint having different PVC
|
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12389 |
in PAINTINDIA > Vol. LII, N° 12 (12/2002) . - p. 41-49
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