German technical background VOK-3720 Surface additives Improved easy-to-clean performance of waterborne coatings replaces BYK-3720

German technical background VOK®-3720 improves easy cleaning surface additives

VOK®-3720 Silicone surface additive to improve the easy-to-clean properties of waterborne coatings. Contains hydroxyl functional groups, which have a good easy-to-clean effect after crosslinking. 

Product Information 

Chemical composition 

Polyether-modified polydimethylsiloxane solution containing hydroxyl groups. 

Typical materialized data 

The data presented on this data page are typical values only and are not technical indicators of the product. 

Density (20 °C): 0.95 g/ml 

Non-volatile (10 minutes, 150 °C): 25% 

Solvent: propylene glycol methyl ether 

Flash point: 31 °C 

Hydroxyl value (effective serving): 29 mg KOH/g 

Storage and transportation 

Storage and transport between 0 °C and 40 °C. 

Application areas 

Coatings industry 

Features and benefits 

The good surfactivity of the additive causes spontaneous migration of the additive to the surface of the coating. It also contains OH functional groups that can crosslink with the corresponding binders. If the additive is immobilized on the surface of the coating by its reactive functional groups, the special properties it brings have good long-term effect. 

VOK®-3720 increases the hydrophobicity and oleophobia of coatings in most coating systems. In addition, the additive can also reduce the dust retention of the paint film and improve the ease of cleaning of the coating film. The additive can improve the substrate wetting ability of the coating, leveling, surface slip, water resistance (anti-whitening), anti-blocking and weathering resistance. Therefore, we recommend that no additional surface additives be added when evaluating VOK®-3720, and if additional leveling additives are required, they should be added in the second step of the test phase. VOK®-3720 can also be used to improve the anti-graffiti and tape peelability of the coating film.

Recommended use 

VOK®-3720 with hydroxyl functional group is recommended for waterborne topcoats. Can be crosslinked to the following resin systems: two-component polyurethane, alkyd/melamine, polyester/melamine, acrylic/melamine and acrylic epoxy blends. 

Recommended dosage 

2-6% additive dosage (in supply form) based on total formulation.

The above recommended addition amount is for reference, and the suitable addition amount needs to be determined by a series of tests. Addition method and processing guidance The additive is recommended to be added at the final stage of production, and the mixing process needs to ensure an adequate shear rate. 

Special reminder 

If the additive is applied in a crosslinkable resin system, it needs to be sanded evenly and thoroughly to ensure adequate interlayer adhesion when recoating.