[article]
| Titre : |
hectorite clay - a unique, multi-purpose rheological additive : Part 1 - Chemistry and peoperties |
| Type de document : |
texte imprimé |
| Auteurs : |
Wouter Ijdo, Auteur ; Douglas N. Smith, Auteur |
| Année de publication : |
2011 |
| Article en page(s) : |
p. 48-52 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Hectorite
Revêtements -- Additifs
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Some of the earliest applications that utilize "clay" date back to antiquity. Clay tokens were used for record keeping pueposes, bricks were made from clay mud and clay pottery had a practical use as well as a decortive purpose. Other typical uses of clay minerals in ancient time were in applications such as bleaching, laundry, cosmetics, medicine, porcelain etc. Some of these uses are still relevant today. Although old, the sophisticated nature of these clay applications should not be underestimated. The ancient Maya blue pigment is perhaps a good example of early nanotechnology where clay is used to stabilize an indigo dye. An organic - inorganic surface complex is formed when indigo dye binds to the clay surface during pigment preparation. Unlike the dye alone, this combined clay-dye complex is remarkably stable and does not fade when exposed to harsh weathering conditions. Furthermore, the clay-indigo color is resistant to acids, bases, chemical solvents and does not biodegrade. Other pigment systems can be formulated for use in coatings based on such dye-clay complexes and as such might offer an environmentally friendly alternative next to pigments currently used in the coatings industry. |
| Note de contenu : |
- Clay classification and properties
- Hectorite geology
- Platelet edge chemistry
- Synthetic hectorite clays
- Organoclays |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11605 |
in PAINTINDIA > Vol. LXI, N° 3 (03/2011) . - p. 48-52
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hectorite clay - a unique, multi-purpose rheological additive in PAINTINDIA, Vol. LXI, N° 3 (03/2011)
