Calcium driers are clear colourless medium viscosity solutions of calcium metallic salt with 2- ethyl hexanoic acid in mineral spirits or esters.
Properties
Calcium carboxylates are auxiliary driers that promote the activity of other driers and especially of through – driers such as lead and zirconium.
Therefore, they show poor drying action on their own.
It is possible to replace a part of lead with a large amount of calcium to prevent the precipitation of lead and maintain the drying efficiency.
Neutral calcium driers also promote pigment wet and dispersion, improve hardness and gloss, while reduce skinning.
Finally calcium is preferentially adsorbed by drier adsorbing pigments and consequently minimises the dry activity loss of the system.
Calcium is the least toxic metal and it is used in paints where lead should be avoided.
Organometal mainly manufactures Neutral calcium driers with metal percentages 4 and 5.
Calcium 10% is an overbased product consisted of 4% calcium carboxylate and 6% CaCO3
Calcium 10% has insufficient emulsifying properties and storage stability and for this reason the use of Calcium 5 % Neutral is preferred and recommended.
Applications
Calcium drier is normally used in combination with other driers such as Cobalt, Lead, Manganese and Zinc.
It is successfully used to lead free drying mixtures and improves the drying rate of Cobalt and Strontium.
Product range for alkyd resins in solvent-borne coatings
ORGANO Ca 5N
ORGANO Ca 4N
ORGANO Ca 10
Solvents: White spirit, D60, Esters
Packaging
For ORGANO Ca 5N and ORGANO Ca 4N iron drum of 180 kg, plastic drum of 50 kg.
For ORGANO Ca 10 iron drum of 200 kg, plastic drum of 50 kg.
Calcium driers are clear colourless medium viscosity solutions of calcium metallic salt with 2- ethyl hexanoic acid in mineral spirits or esters.