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DARVAN®
Dispersing Agents
DARVAN® products are highly effective dispersing agents used to lower the viscosity of particulate slurries and to inhibit the settling of particle solids. When finely divided solids are dispersed in water, there is a tendency for particles to form agglomerates or flocs. The addition of DARVAN® dispersant increases the strength of the atomic charge on the particles causing them to repel one another and remain dispersed. The resulting dispersion has more fluidity, stability and smoothness. For example, pigment suspensions develop greater color strength, additive concentrates remain stable and fluid, pesticide sprays maintain maximum activity, impact grinding achieves maximum efficiency, and ceramic bodies attain optimal rheology.
Typical property comparison for DARVAN C-N and DARVAN 821A:
Form Solids MW ph* Moisture Foaming Ash Sodium
DARVAN C-N liquid 25% 15,000 7.5-9.0 - None <0.04% <70 ppm
DARVAN 821A liquid 40% 3,500 7.0-8.0 - none <0.01% <50 ppm
* 1% solution
APPLICATIONS:
DARVAN C-N and DARVAN 821A are both used for Specialty Ceramics requiring low sodium and in Spay Dried Slurries.
DARVAN C-N is recommended for use in the preparation of casting slips from high oxide electronic bodies where minimum sodium content is desired.
DARVAN C-N is also used to make slurries of ferrites.
The amount of DARVAN® Dispersing agent required for dispersant and stabilization applications will vary with the composition of the product. Simple experimentation will determine the proper amount for each specific use. Usually, the concentration required is between 0.25% and 5.0%, based on the weight of the ingredient being dispersed. The optimal amount of dispersant can be determined by the dispersant demand curve method. A copy of this method is available upon request.
Safety Data Sheet (Darvan C-N) (pdf)
Safety Data Sheet (Darvan 821A) (pdf)
DARVAN is a registered trademark of R.T. Vanderbilt Company, Inc.