Preparation method of papermaking wet strength agent

Abstract

The invention discloses a preparation method of a papermaking wet strength agent. The preparation method comprises the following steps: (1) carrying out polymerization reaction on polyamine, adipate, dimer acid and a catalyst under a heating condition, so as to obtain a polyamide polyamine prepolymer water solution; and (2) adding water, a cationic etherifying agent and epoxy chloropropane into the prepolymer water solution to react at the room temperature, heating to react, and finally adding acid to regulate the pH value, so as to obtain the papermaking wet strength agent with the solid content of 15%-35%. The papermaking wet strength agent has the advantages that the polymerization process is mild, stable and controllable, the gelling of the product caused by overreaction is basically avoided, and the solid content is relatively high; the reaction of monomers is complete; and the product is high in polymerization degree, good in adhesive property, good in quality effect, relatively low in curing temperature, easy to cure, and good in water resistance.

Description

technical field [0001] The invention belongs to the technical field of papermaking auxiliary agents, and in particular relates to a preparation method of a papermaking wet strength agent. Background technique [0002] Polyamide polyamine epichlorohydrin resin (referred to as PPE) is a thermosetting water-soluble resin. It has good paper wet strength, high retention rate, less dosage, non-toxic and harmless, and does not release formaldehyde. It is suitable for It is a kind of paper-making wet strength agent widely used in the paper-making industry because of its advantages in medium-alkaline papermaking. [0003] At present, the wet strength agent for PPE papermaking is mainly produced by adipic acid and diethylenetriamine under the action of a catalyst to generate polyamide polyamine, and then react with epichlorohydrin. Since PPE resin is a very active macromolecular resin, its high solid content is prone to intramolecular crosslinking, and its products are easy to gel, s...

AI Technical Summary

Problems solved by technology

The traditional PPE wet strength agent takes a long time to mature, and the paper can only produce about 50% of the wet strength effect when it is put into the paper machine. Generally, it needs to be stored at room temperature for more than one week to fully produce the wet strength effect, which will affect the use of paper.