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Home  > Publications  > Blog  > Pigment stabilisation without dispersion

Wednesday, 18 September 2019

Pigment stabilisation without dispersion

Friday, 16 July 2010 | Posted by: Sonja Schulte, European Coatings Journal

In order to obtain a high performing coating efficient and effective pigment dispersion is in gerneral indispensible. Long-term stabilisation of the dispersed pigments is a key-factor. However, the permament breaking down of agglomerates into, as far as possible, primary particles is cost- and time intensive. Now, a student developed in his diploma-thesis an aftertreatment for pigment surfaces making the conventional dispersion nearly dispensable.

Formulating coatings is always a challenge - your boss wants you to cut costs without compromising performance, or a raw material is no longer available due to legilative restictions to name only two examples of daily challenges.

Dispering pigments also often is a challenge and the formulator is faced with long and costly dispersion times, unstable dispersions and inconsitent paint color. Aftertreatments are a common way to facilate dispersion of pigments.
Now a student of the University of applied science Niederrhein (Germany ) presented in his diploma-thesis a new aftertreatment for pigment surfaces. He claims, that this treatment makes conventional dispersion dispensable. Since a thermal-oxidative aftertreatment is not sufficent in order to achieve a perfect dispersion of a pigment. Therefore he studied the influence of polymeric substances on pigment surfaces. In a first step the polymeric structures (he tested 9 different substances) have been conventionally dispersed together with  the untreated pigments generating a waterbased pigmentconcentrate. These concentrates have then been converted to solid pigment preperations via dry spraying. Afterwards the pigment preparations have been stired (< 1000 r.p.m.) in different test systems (Styrol-Acrylatedispersion, 2K-PUR, Acrylate/Melamin). One of the tested systems showed a good performance. Conclusion: No conventional dispersion required.Unfortunately it is not published which kind of polymeric substances has been used. This is not surpringing, since the student did his study together with an additve supplier. However, I find this study quite innovative.
Some dispersion stuff to read:
 "Pigment dispersion and its effect on defects and appearance"
http://goliath.ecnext.com/coms2/gi_0199-5875424/Pigment-dispersion-and-its-effect.html

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Author

Sonja Schulte
European Coatings Journal
Sonja Schulte
Editor-in-Chief, Science & Technology
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