Wetting and Dispersing Additives



Welcome to the interactive world of BYK additives. This multimedia “wetting and dispersing additives” brochure has been designed to support your work, offering interactive graphics fascinating animations and videos to show the chemical processes.

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Why do we use wetting and dispersing additives?

One of the most important steps in the production of pigmented coatings is the homogeneous distribution of solid pigments within the liquid binder solution. If this pigment grinding step is not optimized, a wide variety of defects can occur:

 

 

Flocculation
Gloss reduction
Color shift
Separation, 
formation of Bénard cells
Settling.

 

Properties related to the flow characteristics of the coating system, such as

Sagging
Leveling

can also be negatively affected.

Phthalocyanine blue and titanium dioxide; formation of Bénard cells

Possible paint defects...

Gloss reduction on account of larger (flocculated) pigment particles

Separation: Pigments in a pigment blend separate from each other. Organic red pigment and titanium dioxide; separation is made visible by conducting the rub-out test

Settling: It is easier for larger (flocculated) pigment particles to form a precipitate

Runs form if the application is too thick

Runs form if the application is too thick

Poor leveling

Flocculation: Individual pigment particles come together to form larger structures