Preparation method of modified PAE wet strength agent

Abstract

The invention relates to a preparation method of a modified PAE wet strength agent, comprising the following steps of synthesizing polyamide used as an intermediate: reacting 1-1.2 percent of dicarboxylic acid with 0.005-0.02 percent of polyethylene polyamine for 2-10h under the action of a catalyst at the temperature of 140-200 DEG C; reacting 1 percent of the polyamide with 0.2-1 percent of chloroepoxy propane for 2-6h at the temperature of 40-80 DEG C with a pH value of 8-10; adding polymine and hexamethylene tetramine into the PAE, and continuously reacting for 0.5-1.5h; adding hydrogen peroxide after finishing the reaction, wherein the weight ratio of the PAE to the polymine to the hydrogen peroxide is 1:0.002-0.2:0.005-0.02, and the pH value is 2-5. The invention has the advantages that polyamide epichlorohydrin modified by a PEI crosslinking agent is used as a wet strength agent for papermaking, and the wet strength agent can be kept for a longer time without generating bubbles and flocculation and can enable a paper to have stronger wet strength and stronger folding endurance.

Description

technical field [0001] The invention belongs to papermaking industry additives, in particular to a preparation method of a modified PAE wet strength agent. Background technique [0002] The wet strength of paper wet strength refers to the strength of the paper after it touches water or absorbs water in a humid environment. In many paper products, especially industrial paper, decorative paper and fruit bag paper, higher wet strength is required. . The use of wet strength agents can improve the strength of paper when wet or wet. Generally, without adding wet strength agent, the strength of paper after soaking is only 3-10% of the strength of paper when it is dry, but after adding wet strength agent, it can maintain 20-40% of the original strength. There are two types of paper wet strength agents, namely temporary and permanent. The temporary type is used for a short time and discarded after use; the permanent type is used for corrugated paper, fruit bag paper and special p...

AI Technical Summary

Problems solved by technology

In practical applications, when PAE is used alone, the wet strength increase value sometimes fails to meet the requirements of special paper, and it brings many adverse effects in the papermaking process, such as the slurry system is prone to air bubbles and flocculation, and it is difficult to peel off the paper. The uniformity of the page is poor, and too much addition may easily cause problems such as sticking to the cylinder