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Efficiency of surfactants in pigment dispersion / Pournima Abhijit Salve in PAINTINDIA, Vol. LXVII, N° 9 (09/2017)
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Titre : Efficiency of surfactants in pigment dispersion Type de document : texte imprimé Auteurs : Pournima Abhijit Salve, Auteur Année de publication : 2017 Article en page(s) : p. 55-70 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Additifs
Angle de contact
Concentration micellaire critique
Formulation (Génie chimique)
Mouillage (chimie des surfaces)
Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs
Tension superficielleIndex. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Surfactants encompass a variety of compounds that are used in various ways. The term 'surfactant' is derived from 'surface-active agents, and as the name implies, the compounds are used to alter surface phenomena. These chemicals will reduce surface tension and improve wetting and spreading (wetting agents); aid in dispersion of pigments in formulated products (dispersants); inhibit foam formation (defoamers) although others will stabilize foams; and cause or improve emulsion formation (emulsifiers). The performance of a surfactant in lowering the surface tension of a solution can be discussed in terms of the concentration required to produce a given surface tension reduction and the maximum reduction in surface tension that can be obtained regardless of the concentration. These are referred to as the surfactant efficiency and effectiveness respectively. Note de contenu : - INTRODUCTION : Structure - Anionic surfactants - Cationic surfactants - Ampholytic surfactants - Non-ionic surfactants - Conditions under which interfacial phenomena and surfactants become significant - Working principle - Measurement of the critical micelle concentration (CMC) - Measurement of surface tension - Measurement of dynamic surface tension and interfacial tension - Measurement of contact angle - Contact angle - Process of pigment dispersion - Step on : pigment wetting - Step three : Stabilization - Role of surfactants in aqueous pigment dispersion - Mid-HLB stabilizing surfactants (grind aids or grind surfactants) - Low-HLB (wetting agents) - Solvent-free, low-VOC additives - Formulating with zero-voc multifunctional paint additives - A multifunctional additive - Formulation optimization pathway
- CONTRIBUTION TO PROPERTIES : Pigment wetting and dispersing - Color development - Washability and cleansability - Foam - Freeze-thaw stability - Volatile organic content (VOC) - Package or storage stability - Surface tension reduction - Emulsion stabilizer - Open-time extension - Dirt pickup - Resistance (DPR)
- OTHER SURFACTANTSEn ligne : https://drive.google.com/file/d/1asI4KI8zBdbugKoPsc0GMXr7-nVWowrC/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29331
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