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Drying of alkyd emulsion paints
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
2000 (English)In: JCT: Journal of Coatings Technology, ISSN 0361-8773, Vol. 72, 65-74 p.Article in journal (Refereed)
Abstract [en]

The drying and film formation of long oil alkyud emulsions was investigated with emphasis on loss of dry upon storage. The main reason for loss of dry was adsorption of the cobalt (drier) on pigment surfaces as a precipitated hydroxide. Titanium dioxides with alumina surface treatment and organic pigments were most detrimental to drying. Acrylate- and phosphate-based dispersants also deactivated the cobalt, presumably due to complexation and precipitation of the cobalt. Emulsions prepared with an emulsifiable cobalt drier containing 2,2'-bipyridyl (complexing agent for cobalt) showed the best resistance to loss of dry. Atomic force microscopy of films formed from the emulsions showed that the emulsifier migrated to the film surface which, when washed with water, leaves holes or pits in the film. The pits were arranged in a hexagonal pattern characteristic of Bénard cells, which form due to surface tension and/or temperature gradients generated in the film during evaporation of water.

Place, publisher, year, edition, pages
2000. Vol. 72, 65-74 p.
Keyword [en]
HYDROLYZABLE METAL-IONS, OXIDE-WATER INTERFACE, OXIDATIVE CROSS-LINKING, MASS-SPECTROMETRY, MODEL SYSTEMS, ADSORPTION, CO(II), SIO2, TIO2
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26656OAI: oai:DiVA.org:ri-26656DiVA: diva2:1053659
Note
A1321Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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