German technical background VOK-2000 Wetting dispersant Improving the blackness of carbon black in automotive coatings replaces BYK-2000

German technical background VOK ®- Disper 2000 Wetting Dispersant

VOK ®- Disper 2000 is used as a wetting and dispersing agent in solvent based automotive coatings to stabilize pigments in the base paint containing CAB. It can improve the blackness of carbon black in automobile coatings.

Product Information

Chemical composition

Structured acrylic copolymer solution containing pigment affinity group

Typical Physicochemical Data

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

Amine value: 4 mg KOH/g

Density (20 ° C): 1.02 g/ml

Non volatile matter (20 min., 150 ° C): 40%

Solvent: propylene glycol methyl ether acetate/ethylene glycol butyl ether 1/1

Flash point: 45 ° C

Application field

Coating industry

Product features and advantages

VOK ®- Disper 2000 makes pigment deflocculate through steric stabilization, which also makes pigment particles have charges of the same nature. The resulting repulsion effect and steric stabilization prevent the pigment from thickening, thus eliminating the problem of floating color and blossoming in systems containing multiple pigments. Because the particle size of the deflocculating pigment is small, it can obtain high gloss and enhance color strength. In addition, the transparency of transparent pigments and the hiding power of opaque pigments can also be improved. For carbon black with very small particles, VOK ®- Disper 2000 can improve the blackness of carbon black. Moreover, due to the reduction of viscosity, the leveling performance is improved, and the addition amount of pigments can be increased.

Recommended use

VOK ®- Disper 2000 is specially recommended for automotive coatings, and is applicable to the base paint containing CAB and all finish paints. Even if CAB is added after grinding, the additive can prevent the pigment from thickening. In order to obtain good grinding effect, it is not necessary to use CAB in the grinding stage.

Recommended dosage

Additive dosage (purchase form) is based on pigment:

Inorganic pigment: 12-17%

Titanium dioxide: 5%

Organic pigment: 20-70%

Carbon black: 70-140%

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

Adding method and processing guidance

In order to obtain good performance, additives must be added to the grinding material first, and then the pigment.

Pre mix the resin and solvent components in the abrasive, and then slowly add the auxiliary agent in the state of stirring. Pigments can only be added after the auxiliaries have been completely dispersed and uniform. Add VOK to the base material solution with low polarity ®- Disper 2000 may cause a transient increase in viscosity of the system. This is the characteristic of the product and has no influence on the final dispersion result. The above transient viscosity increase can be avoided by adding a small amount of polar solvent (such as alcohol or glycol solvent) to the auxiliary agent or abrasive.