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Emulsion

An emulsion can be defined as a mixture of two normally immiscible liquids without visible segregation. As a simplified classification, the inner phase is given before the outer phase, so that there are two main classes.
Oil-in-water emulsion (O/W emulsion): Finely dispersed oil droplets in the main phase water.
Water-in-oil emulsion (W/O emulsion): Finely dispersed water droplets in the main phase oil

Milk is known from everyday life as a simple example of an O/W emulsion. Here, the oil, i.e. the inner phase, is metastable as an emulsion in an aqueous environment.
Alkyd emulsions are similar in that a hydrophobic oxidatively drying binder is embedded in an aqueous matrix and can thus be used in aqueous paints, among other things.

The production of an emulsion is possible via different mechanisms. In the field of alkyds, the phase inversion emulsion is the classic method. Here, the strong hydrophobicity of the alkyd is partially removed with the aid of emulsifiers. By adding water, it is possible to reach a point that initiates the irreversible transition from a W/O to an O/W emulsion.
The lifetime or stability of this thermodynamically unstable state is finite. The duration of stability depends on several factors. To name a few, droplet size distribution, temperature and pH-value are mentioned here.

KRAEMER offers a selection of ready emulsified binders as well as binders which you can emulsify yourself according to your requirements. Furthermore, there is always the possibility of individual synthesis for your special application.

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