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Using the SZP-04 or SZP-06 electrodes to reverse the charge of a kaolin slurry by adding polyvinylamine.

Method Determination of Zeta Potential

Sample Highly anionic dispersion of kaolin

Solid content approx. 28%

Sample preparation A 10% solution (referring to commercial base) of the polyvinylamine is prepared by dilution with tap water. This solution is added stepwise to 100 ml of the kaolin slurry. Stir the mixture properly before determining the zeta potential.

Equipment SZP-04 or SZP-06, special electrodes for pigment slurries, filter circle (white ribbon)

Result Addition of the cationic polyvinylamine leads to a reversal of the surface charge of the kaolin particles. The slope of the curve starts to decrease at a zeta potential of approximately 30 mV. At this point, almost the maximum amountof polyvinylamine is adsorbed onto the particle surface.

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