Adsorption in latex paints in relation to some of the properties of the mill base and the final coating / Margareta Huldén in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 836 (09/1994)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 836 (09/1994) . - p. 99-105 Titre : Adsorption in latex paints in relation to some of the properties of the mill base and the final coating Type de document : texte imprimé Auteurs : Margareta Huldén, Auteur ; E. Sjöblom, Auteur ; A. Saarnak, Auteur Année de publication : 1994 Article en page(s) : p. 99-105 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acide polyacrylique Agents dispersants (chimie) Brillance (optique) Dioxyde de titane Epaississants Humidité -- Absorption hydroxyéthylcellulose Pigments inorganiques Revêtements -- Propriétés optiques:Peinture -- Propriétés optiques Revêtements en phase aqueuse:Peinture en phase aqueuse Rhéologie Surfactants Index. décimale : 667.9 Revêtements et enduits Résumé : The rheological properties, gloss, hiding power, and water absorption of some model latex paints were analyzed in terms of the adsorption of surfactants, dispersing agent, and thickener onto the latex and pigment particles. Special attention was paid to the order of addition of poly(acrylic acid) and ethyl(hydroxyethyl) cellulose, because this has an effect on the adsorption of the polymers onto the TiO2 pigment. The order of addition also affects the rheological properties of the mill base dispersion and the gloss of the paint. The gloss was also affected by the surfactant used to stabilize the latex. Higher gloss was obtained using a nonionic surfactant than with an anionic surfactant Note de contenu : - PAINT INGREDIENTS-ADSORBENTS AND ADSORBATES - ADSORPTION : Adsorption on the latex particles - Adsorption on the TiO2 pigment - CHARACTERIZATION OF PAINTS-METHODS : Paint formulations - Measurement of rheological properties - Characterization of the final coating - RESULTS AND DISCUSSION : Rheological properties of mill base formulations - Rheological properties of the paints - Properties of the final coatings Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18705 [article]

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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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Mixed adsorption of anionic and nonionic surfactants on latex particles / Margareta Huldén in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 835 (08/1994)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 835 (08/1994) . - p. 67-77 Titre : Mixed adsorption of anionic and nonionic surfactants on latex particles Type de document : texte imprimé Auteurs : Margareta Huldén, Auteur ; B. Kronberg, Auteur Année de publication : 1994 Article en page(s) : p. 67-77 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption Concentration micellaire critique Latex Mélanges (chimie) Modèles mathématiques Revêtements en phase aqueuse:Peinture en phase aqueuse Surfactants Index. décimale : 667.9 Revêtements et enduits Résumé : A model is presented for the adsorption of a mixture of an anionic and a nonionic surfactant on latex particles. The model is based on the Langmuir equation for adsorption and the regular solution theory for mixed micelle formation. Good agreement between the experimental data and the calculated adsorption was obtained with a mixture of sodium dodecyl sulphate (SDS) and nonylphenol ethoxylate (NPE10). The preferential adsorption of the more surface active NPE10 is greatest at the onset of micellization and diminishes as the total surfactant concentration increases. The composition of the mixed surfactant at the surface greatly depends on the total surfactant concentration and on the surface area/solution volume ratio. This is illustrated by the calculated adsorption equilibria at different conditions. Addition of small amounts of organic solvents (e.g., coalescing aids) increases the critical micelle concentration (cmc) of NPE and decreases the cmc of SDS. The decrease in the difference between the cmc values of the two surfactants is paralleled by a reduction in the preferential adsorption of the nonionic surfactant in the presence of a coalescing aid. Note de contenu : - THEORY : A pseudo three-phase system - Monomer-micell equilibrium - Adsorption equilibria - Calculation of mixed adsorption - Adsorption and micellization free energies - Organic solvents - EXPERIMENTAL : Materials - Procedures - RESULTS : Critical micelle concentration - Individual adsorption of SDS and NPE - Mixed adsorption - DISCUSSION : Individual adsorption of the surfactants - Mixed adsorption - Effect of coalescing aids on the mixed adsorption - Effect of solid contents Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18680 [article]

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