[article]
| Titre : |
Specialty inorganic thickeners & new generation opacifiers |
| Type de document : |
texte imprimé |
| Auteurs : |
Anil Bansal, Auteur ; K. K. Mishra, Auteur |
| Année de publication : |
2009 |
| Article en page(s) : |
p. 121-130 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Tags : |
Inorganic clay Bentonite Thickeners Opacifier Aluminum silicate Synthetic barium sulphate White pigment |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The clays minerals, generally characterized by their small particle size, affinity for water, and response to chemical changes in their environment, are noted for their gelling and viscosity-increasing abilities in aqueous systems. Rendered organophilic by association with long-chain organic compounds, several of the clay minerals exhibit similar or even greater gelling abilities in various organic liquids.
Rheological or flow properties have important implications in many and diverse applications. Often, an additive is used to impart the desired flow behavior. Among these, organo clay products, formed by the reaction of organic cations with inorganic clays, are the most widely used additives for solvent-based coatings.
Titanium dioxide is multifaceted material in coating applications. It efficiency scatters visible light thereby imparting whiteness, brightness and opacity to paint and coating material. The cost of TiO2 is increasing steadily and thus the cost of paint with minimum operational margin. There are two ways to stabilize this rise in cost, one is to lower the quality of paint by less use of essential ingredients and another way is to use the subsidiary product in the replacement of the primary product either cent percent replacement or partial replacement which gives some cost advantages.
This work is related to partially replacement of organic thickener by hydrogel 70T, bentocol and rheo-bentone and TiO2 pigment with lithomer R-A whitepigment opacifier or basofix - A synthetic barium sulphate or ALSIL ZX - A synthetic aluminium silicate in non aqueous and aqueous paints respectively, without effect on the quality of paint. The cent percent replacement of TiO2 is impossible and an attempt is made to replace it partially with cost benefit without affecting whiteness, brightness and opacity of paint. Both the extender pigments showed potential of replacing TiO2 in different type of coatings ranging from 15% to 25% by weight depending on the desired end properties.
The present study is focused on the use of inorganic clays as specialty inorganic thickeners and synthetic inorganic chemicals as new generation opacifier for weter and solvent borne paints and coatings. These are superior, particularly in terms of use, while providing the same excellent gelling, rheological, brightness & opacifier control offered by earlier additives. |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6909 |
in PAINTINDIA > Vol. LIX, N° 3 (03/2009) . - p. 121-130
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Specialty inorganic thickeners & new generation opacifiers in PAINTINDIA, Vol. LIX, N° 3 (03/2009)
