German Technical Background VOK-8421 Rheological Additives Used in Automotive Coatings and Industrial Coatings Replaces BYK-8421

German technical background VOK®- AL 8421 Rheological auxiliary

Product Information

Chemical composition: non-ionic modified ethylene vinyl acetate copolymer wax (EVA) lotion.

Typical Physicochemical Data The data given on this data page are only typical values, not technical indicators of the product.

Non volatile matter: 20% Solvent: water melting point (wax component): 105 ° C Viscosity (23 ° C, D=800/s):<100 mPa · s pH value: 5.5

Storage and transportation

The product is sensitive to temperature and must be stored and transported at 5-35 ° C. Stir well before use.  

application area 

Coating industry

Product characteristics and advantages Rheological additives improve the orientation of effective pigments and reduce cloud like color spots/speckles. At the same time, it can reduce the sedimentation of paint during storage and processing. Compared with polyurethane thickener, the additive exhibited lower cosolvent sensitivity; Compared with bentonite and acrylic thickener, it is easier to add and treat (for immediate use). VOK ®- AL 8421 is very suitable for improving rheological properties and brightness of pigment pastes without co solvent effect.

Recommended use

Automotive Coatings

Industrial coatings

Wood furniture paint

Leather finishing agent

Recommended dosage 5-10% of auxiliary dosage (purchase form) is based on the general formula.

The above recommended dosage is for reference, and good dosage shall be determined through a series of tests.

Adding method and processing guidance VOK ®- AL 8421 shall be added after the effect pigment is added at a low shear rate. It is unnecessary to dilute with water in advance. Due to VOK ®- AL 8421 is acidic, and the PH value of the system decreases. Therefore, it is recommended to adjust the PH value to 9-9.5 before adding additives. The higher the solvent content in the formula, the more PH value needs to be adjusted. The final viscosity cannot be adjusted with a viscosity cup, but a rotary viscometer (e.g. Brookfield viscometer) can be used.