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Anionic fluorochemical surfactants which contain an oil-solubilising group, have been shown to be effective as anti-flotation aids. The fluorochemical surfactant can be added t o the paint a t the milling stage but its effectiveness is greater when it is used as a pigment pretreatment.
As mentioned above, fluorochemical surfactants will reduce the surface tension of organic liquids. An example of the utilisation of this property is i n penetrating oils.
Tests have shown that the spread of white spirit con-taining 0.1 O / o of an oil-solubilised non;ionic fluorochemical surfactant, between ground glass plates, is over three times as rapid as white spirit alone. Similar results were obtained when fluorochemical surfactant was added to samples of commercially-available penetrating oils.
One of the best illustrations of hydrocarbon and fluorocarbon surfactants acting synergistically is as emulsifiers. In some cases half of the hydrocarbon emulsifier can be replaced by a few p p m of a fluorochemical surfactant with no loss of emulsion stability. Thus fluorocarbon surfactants offer the possibility of obtaining emulsions with greater stability and with less total surfactant, often a t no greater cost.
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