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The Universal Selection Source:
Coatings Ingredients
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Driers for High Solids and Waterborne Paints

SpecialChem / Jul 27, 2011

Paints and other coating systems form a solid layer during the film-forming process where different physical and chemical processes are important. Oxidative drying is a process in which the evaporation of solvents is followed with an oxidation process of the unsaturated binder under influence of air-oxygen. This oxidative drying process is accelerated by the addition of catalysts, referred to as driers. Driers have been used successfully in conventional, low solids solvent borne coatings. This article highlights the application of driers in waterborne and high solids coatings. Driers, also referred to as siccatives, are organometallic compounds soluble in organic solvents and binders. Chemically, driers belong to the class of metal soaps and they are added to air-drying coating systems to accelerate or promote after application the drying process. The transformation from the liquid film into the solid stage within an appropriate time occurs by oxidative cross-linking of the binder system, a process which is catalysed by the metallic cation of the drier.

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