Charge Neutralization
Diallyldimethylammonium chloride polymer acts as a synthetic cationic polyelectrolyte designed to destabilize negatively charged colloidal suspensions during wet end operations in papermaking. High charge density allows this macromolecule to adsorb rapidly onto fine particulates and dissolved and colloidal substances within aqueous process streams. Neutralization of anionic trash prevents interference with internal sizing agents and synthetic retention aids.
Molecular weight distribution governs the bridging efficiency between distinct suspended particles across the stock preparation loop. Cationic demand titration establishes the precise dosage required to reach zeta potential equilibrium without inducing overcharge reversal.
Retention Efficiency
PolyDADMAC functions primarily as a microparticle component in dual component retention systems for high speed paper machines. Flocculation of short cellulose fibres and precipitated calcium carbonate fillers improves pass efficiency through the forming fabric drainage zones. Shear forces inside the headbox demand a polymer architecture that resists permanent structural degradation under high turbulence.
Shear recovery characteristics depend on the linear charge density and polymer chain length configuration. Drainage rates accelerate significantly when optimal molecular weight grades are metered ahead of pressure screens.
Coatings Fixation
Cationic charge delivery systems immobilize migrating water soluble binders and optical brightening agents during surface sizing applications. Surface strength properties improve because the polymer anchors starch and synthetic latices uniformly within the porous coating structure. Cationic functionalization prevents binder migration toward the drying cylinder faces during high temperature contact evaporation.
Print density values rise on coated offset grades when ink solvent penetration remains uniform across the treated sheet boundary.
