Cobalt driers are blue-violet low viscosity solutions of cobalt metallic soap with a synthetic fatty acid.
Properties
Cobalt is the most important and most widely used drier. It is a primary oxidation catalyst that acts on top of the coated film.
For this reason it is known as Surface or Top drier. Cobalt does not discolour white paints due to addition in small amounts and due to the fact that its deep blue colour counteracts with the yellow of the oils and resins so finally enhances the whiteness of the paint.
Cobalt driers should preferably be added as near as possible to the end of the manufacturing process
Cobalt when is used alone has the tendency to cause surface wrinkling. Therefore, it is often used in combinations with other driers such as Calcium, Manganese and Zirconium.
Cobalt driers can be produced with various fatty acids such as neodecanoic, tallow and other synthetic acids.
Depending on the fatty acid that is used, the drier has different loss-of-dry upon extended storage.
The drying activity of cobalt driers can be boosted with the use of special chelating agents like 1,10 phenanthroline or 2,2 bipyridyl.
These agents, when used in water alkyd systems, not only boost the dry action of cobalt, but they also prevent hydrolysis and stabilise the metal carboxylate.
These chelating agents are also available and for more information please contact our technical department
Applications
- Drier for solvent and water based coatings.
- Printing Ink Drier.
- In solid phase Cobalt carboxylates are used as rubber adhesion promoters.
- Polyester catalyst promoter.
Product range for alkyd resins in solvent-borne coatings
ORGANO Co 12
ORGANO Co 10
ORGANO Co 6
ORGANO Co 5
Solvents: White spirit, D60, Esters and Phthalates
Product range for alkyd resins in water-borne coatings
ORGANO Co 9WB
Packaging
ORGANO Co 12 Iron drum of 200kg, plastic drum of 50kg and 25kg
ORGANO Co 10 Iron drum of 200kg, plastic drum of 50kg and 25kg
ORGANO Co 6 Iron drum of 180kg, plastic drum of 50kg and 25kg
ORGANO Co 5 Iron drum of 180kg, plastic drum of 50kg and 25kg
ORGANO Co WB Iron drum of 200kg, plastic drum of 50kg and 25kg