What is the retention mechanism of amphoteric polyacrylamide?

The retention mechanism of the novel amphoteric polyacrylamide is that the anionic group first neutralizes the cationic waste in the paper material to reduce the electrostatic attraction resistance between the cationic group and the pulp fibers.

What is amphoteric polyacrylamide (ampam)?

Amphoteric polyacrylamide (AmPAM) has been widely used in the wet-end of the papermaking process as a strength additive because of its unique features. AmPAM is a typical polyampholyte, carrying both basic and acid groups along the molecular chain (Dobrynin et al. 2004). Basic and acid groups dissociate in an aqueous solution.

Does inverse emulsion polymerization affect retention property of amphoteric polyacrylamide?

A novel amphoteric polyacrylamide (PDAA) was prepared by inverse emulsion polymerization. The influence of its cationic degree and molecular weight on retention property was discussed.

Why do we use amphoteric polyacrylamide?

The anion group can protect the cation group and repel the “impurity anion” in the pulp system, so that the cation group will not be reacted or neutralized too early. Moreover, amphoteric polyacrylamide has the advantage of being suitable for a wide range of pH values (1, 2).

Is cationic polymer better than amphoteric polypropylene amide?

In contrast, amphoteric polypropylene amide can preferentially adsorb heterocations in the system, so its retention effect is better than that of cationic polymer (3, 4, 5).

How is amphoteric polyacrylamide (PDAA) prepared?

A novel amphoteric polyacrylamide (PDAA) was prepared by inverse emulsion polymerization.