Definition - What does Drier mean?

Driers are various compounds added to paints and coatings intended to decrease the drying time of the paint or coating. Driers help corrosive paints improve their drying characteristics even at low temperatures and in humid environments.

Corrosionpedia explains Drier

The purpose of driers is to improve a coating's drying capabilities and other properties to some extent.

A paint is generally is mixture of three major ingredients known as binders, pigments, and volatile organic compounds (VOCs) and additives, which when applied on any surface forms a thin solid coat layer after oxidation or evaporation. The compounds used as the driers in anti-corrosive paints are the metallic salts of lead, manganese, cobalt, copper and calcium of organic acids.

Some advantages of using driers are:

  • The driers are completely soluble in the paint or coating at room temperature.
  • They are added in very small quantities.
  • They are added shortly before use.

Only one drier should be used at a time considering the purpose of the application. For example, cobalt octoate is used as a drier in oil-based paints; similarly, lead octoate drier is used in anti-corrosion coatings, varnishes, dispersion agents for pigments and as a grinding aid for coatings.

Some common paint driers are iron octoate, calcium octoate, cobalt octoate, zinc octoate, copper octoate, barium octoate and lead octoate.

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