PPE epoxy polyester wet strength agent for chemical name of polyamide polyamine epichlorohydrin resin is internationally referred to as PPE or PAE. The product is water-soluble cationic thermosetting resin, which is superior to conventional urea aldehyde resin and melamine-formaldehyde resin. PPE resin can not only improve the paper wet and dry strength, but also improve fines and filler retention, and promote the AKD sizing retention and ripening. Thus it is suitable neutral or slightly alkaline conditions of papermaking. It can be widely used in household paper, bond paper, banknote paper, fruit bag paper, offset paper, wrapping paper, newsprint paper, decorative paper and other paper with requirements of wet strength.