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The Universal Selection Source:
Coatings Ingredients
Article

HSP-Based Dispersants Selection Method for Instant Match

Sander van Loon – Apr 20, 2016

HSP Testing
Predictive power increases with the number of HSPs tested.
So in practice, more knowledge, fewer experiments
& more savings.
The selection of a suitable dispersant for a filler or a pigment (solid particle) can be difficult and time-consuming (variety & amount of dispersants, nature & surface treatment of the solid particle...).

Discover an effective method, tested & validated by VLCI, based in Amsterdam!


It will help you to turn this complex selection task into an immediate prediction of the best dispersant by applying Hansen Solubility Parameters (HSP) in your paint, coating or ink development.

The validity of this new screening process has been proven using the more conventional optimum dispersant concentration (ODC) test methodology.

Another reason to explore this screening method is the fact that the more you use it, the less effort you need to find perfect pigment / dispersant pairs…


Coming next:
  • Selection of Dispersants: How is it done in the industry?
  • HSP-based Dispersant Screening
  • Determining HSP of Pigments, Fillers & Dispersants
  • Calculation of Particle-Dispersant Distances
  • Validation of HSP with ODC
  • Savings with HSP-based Dispersant Selection method



2 Comments on "HSP-Based Dispersants Selection Method for Instant Match"
Sander van L Apr 25, 2016
Thanks, Titus! Indeed, these are dispersants for waterbased applications and even their HSP is determined when in water. This makes it practical for their use in waterbased formulations such as coatings. HSP gives you guidelines to a much smaller area to test, compared to when just performing the same with trial and error. But indeed, not everything can be taken into account, so practical tests always needs to be done! Same approach works for the carbon black indeed (mentioned in the HSPiP book) and might be more challenging, but the process is more or less the same. Hope this helps!
Titus S Apr 22, 2016
Nice work, though it leaves out some important points for practical applications. This makes it of course much simpler for start and introduction of the concept, which is well done. An obvious problem is and hard to believe that dispersant efficiency should be independent on continuous phase (water or a specific solvent(composition). Continuous phase did not played any role in the sketched selection process. Seemed to work well for water because dispersants tested likely are products developed for aqueous media. It is easy to compute HSP's for dispersant mixtures, however, due to preferential adsorption this approach will likely fail if dispersants differ much in composition and structure. In case of pigments like talc, process of dispersion and input of energy will be of second order and the effect of stabilization by dispersants is easily modeled. For pigments highly agglomerated and aggregated (e.g. carbon black, aerosil) situation is much more complex.

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