The new dispersing additive from Evonik, Tego Dispers 747 W, is efficient in three ways: First, it increases pigment loading, which simplifies the grinding process. Second, it can be used for all types of iron oxide, thus reducing the number of dispersing additives needed – a significant difference from additives based on polyacrylate salts. Third, it closes the price/performance gap to many more costly polymer additives.
It has been specially developed for water-based iron oxide concentrates in architectural applications. The additive combines the advantages of electrostatic stabilisation with those of steric stabilisation.
As a result, this provides lasting pigment stabilisation for a uniformly high level of colour intensity, even when stored for long periods of time. In addition, the additive lowers the viscosity of the pigment concentrate. This allows the concentrate to absorb more pigment, reducing the amount of concentrate needed to cover a given surface area.
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