In this case wax additives and silicone based additives can be the solution. Both improve surface slip significantly. Wax additives need to be used in dosages between 0.3% and 0.5% solid wax on total formulation where as silicones already give a good improvement in very low dosages starting from 0.05% solid additive on total formulation. Many waxes are fully compliant to FDA 175.300, silicone based additives often are not (fully) compliant to FDA 175.300 but can be used up to a maximum dosage based on migration studies or non migration principle. In that case please contact us to calculate this dosage. As wax additive we recommend to test CERACOL 609 N. It is a modified Lanoline wax in dispersion form. The dispersion form makes it very easy to be incorporated into the coating. A second option is CERAFAK 186 N - a hydrocarbon wax dispersion. Other wax additives are available, also micronized 100% products. If silicones are preferred we recommend testing BYK-313. In terms of FDA 175.300 it can be used up to 0.5% delivery form on total formulation. Migration needs to be checked in case BYK-313 or other silicones are used. With wax additives migration will not occur.
Please test CERAFLOUR 994 in a dosage of 3-4% on total formulation. It is a micronized product but can still be incorporated easily with medium shear force.
Please visit our website using the following link: http://www.byk.com/en/support/additives/regulatory-affairs.html. Here you can find many information and in addition contact data in case you need additional or different information from our experts.
Please test BYK-3410. This product is silicone free and fully compliant to FDA 175.300. By reducing the surface tension of the liquid paint it will improve the substrate wetting. It can be post added.
In order to overcome the substrate wetting problem the surface tension of the liquid coating needs to be reduced. There are two options: a) Silicone solution: Please try one of our solvent borne silicone based additives such as BYK-333 or BYK-307. These products will give you a significant reduction of surface tension. We recommend a starting dosage of 0.1 – 0.2% delivery form on total formulation. Other products are available. Second option is b) silicone free: BYK-399 is a silicone free polymeric levelling additive that gives you a slight reduction of surface tension. But this slight reduction is very often already enough to overcome substrate wetting problems. Please try 0.3 to 0.5% delivery form on total formulation.
In case you want to avoid silicone based additives we recommend wax additives. Wax additives are available in solid form (micronized) and as dispersions. To achieve scratch resistance we recommend using a polyethylene wax additive or lanoline based wax additives. Suitable products are CERACOL 604 (PE alloy micronized) or CERACOL 609 N (modified lanoline dispersion). Wax additives contain particle whereas silicone additives are polymers. In case wax additives are used the gloss level should be checked.