Act as oxidation catalysts, as their metal soaps exhibit more than one oxidation state. Primary driers catalyse cross linking of the resin and in the process hydroxyl, carbonyl and carboxylic groups are formed.
Ensure that a coating dries at a uniform rate throughout the body of the film. Primary driers without the presence of through driers would mainly dry the surface of the film, whilst the coating underneath would remain wet. Through driers are used to ensure that the coating dries at a uniform rate throughout the body of the film not just at the surface. Through driers link fatty acid chains via oxygen-metal-oxygen bridges leading to cross-links.
Modify the effect of other driers but do not demonstrate any drying action on their own.
We offer a variety of customised drier combinations pre-mixes which offers advantages over single metal driers. These combinations are technically pre-stabilised and eliminates the problems of gelling arising from the acid/base nature of different driers.
Water Dispersible Driers:
In solvent-based air-drying systems, the same cobalt-based drier will be able to function satisfactorily in many different coating types. This is not the case in waterborne or water- reducible systems as the drier system is strongly dependent on the nature of each individual coating product. This is partly due to the large diversity of water-reducible binders and partly due to the presence of certain ingredients in some waterborne systems that may affect the driers.
The different compositions of water-soluble and solvent soluble oxidatively drying coating materials make accurate adjustments to the drier system essential.