A large molecular sizing agent modified AKD was prepared through the reaction between alkyl ketene dimmer (AKD) and polyamide then cationization by epichlorohydrin.

• 将聚酰胺多胺与AKD反应,并用环氧氯丙烷将其阳离子化,制备出一种具有高阳电荷的改性AKD大分子,并在中、碱性条件下用该改性AKD对漂白硫酸盐阔叶木浆进行施胶。