Defoamer selection in waterborne coatings / Robin A. Reinhardt in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 885 (10/1998)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 70, N° 885 (10/1998) . - p. 157-160 Titre : Defoamer selection in waterborne coatings Type de document : texte imprimé Auteurs : Robin A. Reinhardt, Auteur ; Wernfried Heilen, Auteur ; Ellen Walhorn, Auteur ; Stefan Silber, Auteur ; Jay W. Adams, Auteur Année de publication : 1998 Article en page(s) : p. 157-160 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimousse Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne coatings systems differ from solventborne systems in a number of ways. One key difference is the fact that water displays a high surface tension, which must be lowered to allow spreading over low-energy substrates. But solving this problem often leads to another problem: the surfactants used to lower surface tension tend to stabilize foam. This foam, in turn, must be destabilized during manufacture and application through the use ofa defoamer. Choosing the proper defoamer for any given system has always been a matter of empirical selection. But today, new methods of analysis can help with that selection process. This article presents new and existing research in the areas offoam control and defoamer selection that can help minimize the amount of empirical work needed. Note de contenu : - FOAM CONTROL - CAUSES OF FOAM - DEFOAMER CHEMISTRY FOR AQUEOUS SYSTEMS : Active substances - Surface-active agents - Carrier fluids - FACTORS THAT INFLUENCE DEFOAMER SELECTION - WHAT DETERMINES DEFOAMER EFFICIENCY - DEFOAMER INCORPORATION - TEST METHODS - DEFOAMER EMULSIONS VERSUS COMPOUNDS - DEFOAMER PERSISTENCE AND STORAGE STABILITY Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18046 [article]

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Defoamers - nothing but empirical results ? / Ellen Wallhorn in EUROPEAN COATINGS JOURNAL (ECJ), N° 10/97 (10/1997)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 10/97 (10/1997) . - p. 911-918 Titre : Defoamers - nothing but empirical results ? Type de document : texte imprimé Auteurs : Ellen Wallhorn, Auteur ; Wernfried Heilen, Auteur ; Stefan Silber, Auteur Année de publication : 1997 Article en page(s) : p. 911-918 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimousse Encre Revêtements -- Additifs Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : In this paper we first investigate particle size distributions of defoamer droplets in water-borne paints and inks. The size distribution of those droplets is of crucial importance for the defoaming effect. We have determined that it is influenced by different factors during manufacture and application: (1) shear rate, (2) emulsifying properties of the binder and other formulation ingredients, (3) time of incorporation and storage time, (4) viscosity ratio of defoamer droplet ηd and the matrix phase ηm and (5) the interfacial tension γmd between droplet and matrix. The given fundamental results enable better recommendations for the use of defoamer compounds and emulsions. Note de contenu : - Mechanism of defoamer activity - Experimental part - Defoaming materials - Incorporation - Test methods - Measurement of defoamer droplet size - Measurement of interfacial tension - Fundamental results obtained in the alkyd system as an example - Addition - Defoamer emulsions for mild stirring - Compounds for addition during grinding stage - Influence of ohter components in paint formulation - Long-term activity through high interfacial tension - Prethinning the active matter - Defoamer proposals for different systems - Filled defoamer emulsion for the alkyd system - Dispersibility of test systems - Hydrophilic compound for the acrylic system - defoamer emulsion for the polyurethane system Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11432 [article]

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Dispersants for waterborne pigment concentrates / Wernfried Heilen in EUROPEAN COATINGS JOURNAL (ECJ), N° 10/95 (10/1995)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 10/95 (10/1995) . - p. 712-716 Titre : Dispersants for waterborne pigment concentrates Type de document : texte imprimé Auteurs : Wernfried Heilen, Auteur ; Georg Feldmann-Krane, Auteur ; Stefan Silber, Auteur Année de publication : 1995 Article en page(s) : p. 712-716 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Additifs Agents dispersants (chimie) Dispersions et suspensions Encre Mouillage (chimie des surfaces) Pigments Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Selection of wetting and dispersing aids for waterborne systems is discussed, considering pigment loading, flocculation, viscosity stability, colour development and effects on other properties of coatings and inks. A novel wetting and dispersing agent will be describes which meets practical industrial needs. It offers the opportunity to produce pigment concentrates without using additional wetting additives or grinding resins. Note de contenu : - Tinting - Pigment pastes for solvent-based coatings - Pigment pastes for waterborne coatings - Wetting of pigment particle surfaces - Mechanical deagglomeration of pigment particles - Modes of stabilization - Methods of evaluation - Influencing factors - Concept of an ideal waterborne pigment concentrate - Pigment content and storage stability of the pastes - Colour-strength development and stability - Compatibility with resins - Flocculation stability and coating properties Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11370 [article]

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