Mechanical stability of alkyd emulsions - Part 1 : influence of emulsion droplet size and the emulsifier / Gunilla Östberg in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 832 (05/1994)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 832 (05/1994) . - p. 37-46 Titre : Mechanical stability of alkyd emulsions - Part 1 : influence of emulsion droplet size and the emulsifier Type de document : texte imprimé Auteurs : Gunilla Östberg, Auteur ; Björn BergenstÃ¥hl, Auteur ; Margareta Huldén, Auteur Année de publication : 1994 Article en page(s) : p. 37-46 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Emulsifiants Gouttelettes Particules (matières) Polyalkydes Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs Surfactants Index. décimale : 667.9 Revêtements et enduits Résumé : The limited colloidal stability of alkyd emulsions compared to that of organic solvent-borne alkyd paints is a well-known problem. For environmental reasons, however, the alkyd emulsions have a great advantage since they are waterborne. In this study, the influence of emulsifier and initial droplet size on the mechanical stability of alkyd emulsions was investigated. Anionic emulsifiers have been shown previously to be more effective than nonionic emulsifiers in the formation of alkyd emulsions. This study showed that an anionic emulsifier also gave more stable emulsions at lower concentrations than did the nonionics. If the concentration was increased, emulsions stabilized with a nonionic emulsifier showed the same stability as the one with the anionic emulsifiers. However, too high a concentration of surfactants is undesirable in paints, since it increases the water sensitivity of the paint film. The mechanical stability of emulsions stabilized with anionic emulsions was less sensitive to the initial droplet size than emulsions stabilized with a nonionic emulsifier. Note de contenu : - EMULSION STABILITY : Methods for mechanical stability - EXPERIMENTAL : Materials - Methods - RESULTS AND DISCUSSIONS : Influence of initial droplet size - Influence of concentration of emulsifier - Different types of emulsifiers Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18627 [article]

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Mechanical stability of alkyd emulsions - Part 2 : influence of alkyd properties / G. Östberg in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 838 (11/1994)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 838 (11/1994) . - p. 37-41 Titre : Mechanical stability of alkyd emulsions - Part 2 : influence of alkyd properties Type de document : texte imprimé Auteurs : G. Östberg, Auteur ; Björn BergenstÃ¥hl, Auteur Année de publication : 1994 Article en page(s) : p. 37-41 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cisaillement (mécanique) Emulsifiants Polyalkydes Revêtements en phase aqueuse:Peinture en phase aqueuse Rhéologie Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : The development of waterborne alkyd paints based on alkyd emulsions has been stimulated by more stringent health and environmental regulations. In addition, alkyd paints may have better performance in some applications compared to other types of waterborne paints such as latex dispersions. One problem that needs to be overcome is the limited colloidal stability of alkyd emulsions. It is important that the emulsions are not destabilized when exposed to shear forces, such as those produced by pumps used in the paint industry. An alkyd emulsion consists of alkyd oil droplets dispersed in water and stabilized by a surface active agent (emulsifier). Part 1 of this series described the influence of emulsion droplet size, type, and concentration of the emulsifier on the shear stability. The present study is an additional investigation of the influence of the alkyd properties on shear stability. Increasing the acid value of the alkyd increases the stability of emulsions stabilized with nonionic emulsifiers. Emulsions made using alkyds with shorter oil lenghts and higher viscosities were less stable to shear compared to alkyds with higher oil lenghts and lower viscosities. Note de contenu : - Emulsification - Determination of droplet size - Mechanical stability Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18726 [article]

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