Mini-Encyclopedia of Papermaking Wet-End
Part Two: Definitions and Concepts
Charge neutralization refers to a state in which the net electrical charge of particles, fibers, colloidal material and polyelectrolytes in aqueous solution have been canceled by the adsorption of an equal number of opposite charges. Usually these opposite charges are supplied by a multi-valent material. For example alum, with its tri-valent cations, is effective for neutralizing the negative charge of rosin soap at acidic pH. Quaternary polyamines and other highly charged cationic polymers are very effective for neutralizing the charge of anionic particles over a very wide range of pH. A state of charge neutralization is often associated with the most rapid coagulation of suspensions and the most rapid drainage of papermaking furnishes.
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