[article]
| Titre : |
Dispersing agents. An indispensable additive |
| Type de document : |
texte imprimé |
| Auteurs : |
Mangesh I. Chaudhari, Auteur |
| Année de publication : |
2008 |
| Article en page(s) : |
p. 109-128 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Chimie industrielle
Dispersions et suspensions
Revêtements -- Additifs:Peinture -- Additifs
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Dispersing is a basic requirement of many industries such as paints, textiles, pharmaceuticals, and food, etc. Every industry is using this dispersion phenomena for different reasons but, the main purpose of uniform dispersion is same i.e. Improvement in quality of product. In order to achieve this, plethora of dispersing agents are available in market, which are tailor-made according to the need of particular sector. Paint industry is a major consumer of dispersing agents, because many properties (stability, gloss, performance, etc.) are dependent on dispersion of pigment in binder system. Future trend in paint industry is shifting towards use of water based systems due to advent of concern awareness towards environmental issues, which requires extensive use of these dispersing agents in order to disperse non polar pigments in relatively polar systems. Similarly, uniform suspension of drug particles is basic requirement of pharmaceutical industry and uniform appearance of emulsified food products is very essential for food industry which is possible only with the use of dispersing agents. Their selection, use and performance are dependent on various parameters andhave efficacy to influence properties of final product. This article mainly ocvers various aspects of these dispersing agents which include their mechanism, types and role in paints and some other allied industries. |
| Note de contenu : |
DISPERSING PROCESS : Wetting - Grinding - Stabilization / Electrostatic repulsion - Steric hindrance.
SELECTION CRITERIA FOR DISPERSING AGENTS : HLB value - Chemical nature of dispersing agent - Biodegradability.
PAINT INDUSTRY : Low and high molecular weight dispersing agents.
COMMON ISSUES SOLVED BY DISPERSANTS : Haze - Pigment flocculation - Sedimentation - Floating or Bernard Cells - Rub up/flooding - Inhomogeneous color - Weather and chemical resistance.
TEXTILE - FOOD - PHARMACEUTICALS - OTHER INDUSTRIAL APPLICATIONS. |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8988 |
in PAINTINDIA > Vol. LVIII, N° 4 (04/2008) . - p. 109-128
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