Sedimentation in Water-Borne Paints

Sedimentation in Water-Borne Paints

Our emulsion paints, based on a terpolymer and pigmented with calcium carbonate and titanium dioxide settle out after a month, despite the fact that we incorporate sodium hexametaphsophate and pigment dispersing agent. What would you advise us to do ?

There are many different anti-settling agents on the market, suitable for aqueous systems.These include products based on cellulose derivatives, polysaccharides, polyurethanes as well as mineral-based products. Their use makes the incorporation of sodium hexametaphosphate superfluous - and probably also the pigment dispersing agent. The anti-settling effect produced by most additives is also accompanied by thickening of the paint, so that the amount added must be carefully worked out. Here, it is important to use only grades of calcium carbonate which have been surface treated.

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