Evonik has launched VP 4200, a new structure modified silica type for anti-fouling coatings to reduce biocide content. The new product allows for a more controlled release of biocide, which is needed in lower quantity for the same performance, and ensures a low thickening effect and easy incorporation.
Evonik's latest addition to the silica-based AEROSIL® product group is VP 4200, a new structure modified silica type with free OH-groups that enables formulating more eco-friendly, cuprous oxide containing anti-fouling coatings.
VP 4200 is tailor made for both CDP (Controlled Depletion Polymer) and SPC (Self-Polishing Coating) coatings.
Thanks to its ability to form a complex with Cu2O, VP 4200 ensures a better control of the release of the biocide. The performance is guaranteed by its formulation with only 10 pbw% cuprous oxide and 4 -6 pbw% VP 4200, which leads to the same performance as the standard type with up to 50 pbw% Cu2O.
VP 4200 has a relatively low thickening effect, so higher amounts can easily be incorporated into the systems, especially in combination with TEGO® Dispers 1010.