German technical background VOK-203 Wetting dispersant Prevent pigment from settling and floating replaces BYK-203

German technical background VOK ®- Disper 203 Wetting Dispersant

VOK ®- Disper 203 is a controlled flocculating wetting and dispersing agent for solvent based systems, which is used to prevent the settlement of fillers and inorganic pigments in medium to low polarity thick coating systems and primers, as well as the preparation of bentonite slurry.

Product Information

Chemical composition

Alkyl ammonium salt solution of polycarboxylic acid

Typical Physicochemical Data

The data given in this data page are only typical values, not technical indicators of the product.

Amine value: 51 mg KOH/g

Acid value: 51 mg KOH/g

Density (20 ° C): 0.89 g/ml

Non volatile matter (10 minutes, 150 ° C): 50%

Solvent: solvent oil

Flash point: 46 ° C

Storage and transportation

When the storage and transportation temperature is lower than 5 ° C, stratification or turbidity may occur. Heat to 20 ° C and fully mix.

Application information

Coating industry

Features and Benefits

The additive plays a role by controlling flocculation of pigments. The flocculation control function can also resist sagging, prevent pigment sedimentation and floating color. VOK ®- Disper 203 is suitable for medium to low polarity solvent based and solvent-free paint systems, which can improve thixotropy. When used as anti-corrosion primer, it can often improve the anti-corrosion performance. VOK ®- Disper 204 is a very similar product, and it is also applicable to non-polar systems.

Recommended Applications

Coil coating

Anti corrosion system

Recommended dosage

Additive dosage (purchase form) is based on pigment:

Inorganic pigment: 1-2%

Titanium dioxide/filler: 0.5-1%

Bentonite: 30-50%

The above data are empirical dosage, and good dosage shall be determined through a series of tests.

Addition method and processing guidance

In order to obtain good performance, the additive should be added to the abrasive first, and then the pigment.

Recommended formula of bentonite slurry:

85-87 parts by weight of solvent

10 parts by weight of bentonite

5-3 parts by weight of additives

The solvent shall be aromatic or aromatic petroleum solvent. If the gel effect is insufficient, polar solvent can be added to enhance the gel effect.

Special attention

In coatings based on nitrocellulose, chlorinated rubber or polyvinyl chloride copolymer, these additives may cause discoloration. In the silicate coating, the construction time limit will be shortened. Higher addition will affect the construction time limit and curing reaction of epoxy system. The amine value of the additive is high, which will cause the viscosity of epoxy resin to increase.