| Titre : |
Role of micaceous iron oxide in protective coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Chinmaya Nayak, Auteur |
| Année de publication : |
2002 |
| Article en page(s) : |
p. 52-72 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Tags : |
'Résistance intempérie' Feuil 'Perméabilité eau' 'Propriété physique' Délaminage Cloquage Liant 'Forme particule' 'Concentration pigmentaire volumique critique' volumique' Performance 'Structure lamellaire' Fer Oxyde 'Protection corrosion' 'Pigment anticorrosion' minéral' Formulation 'Peinture Matériau Revêtement |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Micaceous iron oxide (MIO) pigments have long been used successfully all over the world in a variety of protective coatings for long term protection of structural steels. The protective characteristics of these pigments have been attributed to the orientation of lamellar and flaky pigments which produces an increase in resistance to water permeation through the paint film. Use of micaceous iron oxide also reduces the ultraviolet degradation of the binder system and provides mechanical reinforcement to the paint film. The present article deals with the physical and chemical characteristics of these pigments and their effects on the final coating performance. Several other factors such as their incorporation level, influence of pigment volume concentrations, compatibility with different binders and extenders have also been discussed. The mechanism, using micaceous iron oxide has also been discussed in detail. Special emphasis has also been focussed on their water permeability and weatherability characteristics. In addition to this the blistering behavior of the pigmented paint film has been explained on the basis of water vapor transmission phenomena. |
| Note de contenu : |
- Micaceous iron oxide pigment: General features
- Natural versus synthetic MIO pigment
- Pigment characteristics in protective coatings
- Mechanism of protection : - Barrier effect - Ultraviolet light protection - Film reinforcement and adhesion promotion - Improved intercoat adhesion
- Formulation aspects
- Factors affecting the coating performance : - Role of critical pigment volume concentration (CPVC) - Effect of pigment volume concentration (PVC) - Effect of particle shape on corrosion protection
- Impact of different binders on coating performance : - Oleoresinous and alkyd resins - Chlorinated rubber - Acrylated rubber resin - Vinyl copolymers - Epoxy resin - Moisture cure polyurethanes
- Pigment dispersion
- Effective levels of incorporation of MIO pigments
- Incorporation of extenders
- Resistance to blistering and delamination of the paint film
- Reducing pigment settlement
- Widening the colour range
- Water permeability characteristics
- Weathering characteristics |
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in PAINTINDIA > Vol. LII, N° 11 (11/2002) . - p. 52-72
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Role of micaceous iron oxide in protective coatings in PAINTINDIA, Vol. LII, N° 11 (11/2002)
