G. Ostberg et al., MECHANICAL STABILITY OF ALKYD EMULSIONS .1. INFLUENCE OF EMULSION DROPLET SIZE AND THE EMULSIFIER, JCT, Journal of coatings technology, 66(832), 1994, pp. 37-46
Citations number
29
Categorie Soggetti
Chemistry Applied","Materials Science, Coatings & Films
The limited colloidal stability of alkyd emulsions compared to that of
organic solvent-borne alkyd paints is a well-known problem. For envir
onmental 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 emulsion
s 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 t
he concentration was increased, emulsions stabilized with a nonionic e
mulsifier showed the same stability as the one with the anionic emulsi
fiers. 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 emulsi
ons was less sensitive to the initial droplet size than emulsions stab
ilized with a nonionic emulsifier.