Charge Measurements of Different Furnishes Using Polyelectrolyte Titration with a Streaming Current Detector, 1993 Papermakers Conference Proceedings

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Measurements were made using poly-dimethyl-diallylammonium chloride and 3.6.-ionene a s cationic polyelectrolytes (PE) and polyethensulphonate as anionic PE. Four basic systems were studied: fibers, fillers, soluble material and different mixtures of these.

The cationic demand of fibers and fillers was greatly affected by the type of titration and by the titrant. The smaller M, titrant (3.6.-ionene) gave larger demands as did back titration, when compared with direct titration. Increased beating and higher pH raised the cationic demand of fibers. Direct titration is not very suitable for quantitative determination in the case of tillers and fibers. The soluble material was not as sensitive to the type of titration and titrant. The cationic demand of different components was additive only in the case of soluble components.

When this method is used correctly, it is suitable for optimizing the dosage of charge neutralizing retention aid.