BYK Additives & Instruments

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Circulation line

I have a problem with some colors with the paint circulation in metallic colors in the paint piping that sends from the paint house to the cabinet application. The color is dark in the angle of 25°.

This issue you're describing seems to be more related to the metallic pigments than anything else. Due to the fact that the paint is constantly pumped round circulation systems, high shear force arises in critical pump systems. These can damage the metallic pigments. If this is definitely your issue, you need to use special aluminum pigments, so-called non-degrading flakes (NDF) which have been developed for particularly aggressive circulation lines from the ECKART company. Sometimes it is only a matter of aluminum flake orientation, which could be solved by the addition of some wax dispersion to achieve an even formation of the aluminum flakes during the application process. Then the incorporation of e.g. CERAFAK 103 or CERAFAK 106 the rheology modified CERATIX 8461 or CERAFAK 8563 is quite helpful.

Slip

We are looking for improved surface slip in a solvent borne external can coating based on Polyester / Melamine. The coating will be applied on sheets. The product needs to be compliant to FDA 175.300 and we can not accept migration. Which additive do you recommend?

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. 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.

Meat release

Our internal EP based gold lacquer shows bad meat release. Do you have any FDA 175.300 compliant additive available to be used?

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.

Regulatory questions

Where can I find information concerning food contact status, REACH etc. of your products?

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.

Substrate wetting in a waterborne coating

Our waterborne internal can coating shows bad wetting on tinplate. We are looking for a silicone free product being fully compliant to FDA 175.300. We would like to post add the additive. What can you recommend?

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.

Substrate wetting in a solvent borne coating

Our solventborne external can coating shows bad wetting on tinplate. We are looking for a product to overcome this, we don’t need to be compliant to FDA 175.300. We would like to post add the additive. What can you recommend?

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.

Scratch resistance

We are looking for improved scratch resistance in a solvent borne internal can coating based on EP/Phenol. The coating will be applied on sheets. To avoid any migration during production process we don’t want to use any silicones? Which BYK additives can be recommended?

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.