German Technical Background VOK-161 Wetting Dispersant Good Viscosity Reduction of Abrasive Replaces BYK-161

German technical background VOK ®- Disper 161 Wetting Dispersant

VOK ®- Disper 161 Wetting dispersant for solvent based automotive coatings, industrial coatings and pigment concentrates. It is especially suitable for stabilizing ultra-fine carbon black and organic pigments, especially two-component polyurethane and baking systems. The viscosity of abrasive is well reduced.

Product Information

Chemical composition

Modified polyurethane solution

Typical Physicochemical Data

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

Amine value: 11 mg KOH/g

Density (20 ° C): 1.02 g/ml

Non volatile matter (20 minutes, 150 ° C): 30%

Solvent: propylene glycol methyl ether acetate/butyl acetate 6/1

Flash point: 38 ° C

Storage and transportation

When the temperature is lower than 0 ° C, stratification or turbidity may occur. Heat to 20 ° C and mix thoroughly.

Special attention

The surface treatment of some organic pigments will adversely affect the effectiveness of the wetting and dispersing agent. In this case, the same type of untreated pigment can be used. When used in coil coatings, the interaction between the cationic promoter and acid catalyst must be considered. Free acid or epoxy blocked acid is more suitable than amine blocked acid. This problem can be solved by using VOK ®- Disper 170 series.

Application information

Coating industry

Features and Benefits

The high molecular weight additive can deflocculate and stabilize the pigment through space steric hindrance. VOK ®- Disper 161 provides the same charge to the pigment particles. The resulting repulsive force and steric stability can effectively avoid possible co flocculation, so that the multi pigment system will not produce floating color and blooming. The deflocculating property of the additive can increase the luster, color strength, transparency and hiding power of the coating, and reduce the viscosity of the abrasive.

Application field

Automotive Coatings

Industrial coatings

Architectural coatings

Anti corrosion paint system

Recommended dosage

Additive dosage (purchase form) is based on pigment:

Inorganic pigment: 10-15%

Titanium dioxide: 5-6%

Organic pigment: 30-90%

Carbon black: 70-140%

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, additives shall be added to the grinding material first, and then the pigment shall be added. First, premix the resin and solvent components of the abrasive, and then slowly add additives under constant stirring. Pigments shall not be added before the additives are uniformly mixed.