Papermaking reinforcing agent and preparation method thereof

Abstract

The invention provides a preparation method of a papermaking reinforcing agent, which comprises the following steps: S1) carrying out polymerization reaction on a first cationic monomer, acrylamide and a second cationic monomer under the action of an initiator to obtain a base polymer, wherein the first cationic monomer and the second cationic monomer are quaternary ammonium salt cationic monomersand are different in type; S2) mixing a weakly alkaline catalyst with the base polymer in water, adjusting the pH value to be weakly alkaline, then adding glyoxal, and stirring the mixture for reaction to obtain the papermaking reinforcing agent. Compared with the prior art, the papermaking reinforcing agent provided by the invention is simple in preparation method and mild in reaction process, and the obtained papermaking reinforcing agent is relatively good in storage stability.

Description

technical field [0001] The invention belongs to the technical field of papermaking, in particular to a papermaking reinforcing agent and a preparation method thereof. Background technique [0002] Papermaking process chemicals include polymer synthetic substances used for strengthening, retention, and drainage. These additives are called strengthening agents, retention aids, and drainage aids. Making full use of new high-efficiency papermaking chemicals is the main means for the papermaking industry to improve production efficiency and product quality, reduce costs and reduce pollution. Among them, a class of fine chemicals used to enhance the strength of paper and cardboard is called paper strengthening agent. Papermaking strengthening agents can be divided into dry strength agents and wet strength agents according to different effects. [0003] Dry strength agent is a fine chemical that improves the physical strength (stiffness, tensile strength, ring compression strengt...

AI Technical Summary

Problems solved by technology

However, in general, the high concentration and high storage temperature of glyoxalated polyacrylamide products will greatly shorten the stability period of product quality

[0004] The U.S. Patent No. US4603176 discloses a preparation method of a temporary wet-strength polymer of glyoxal-modified polyacrylamide. During the preparation process, hydrophobic monomers with a specified molar ratio are added, but the preparation process is too strict. Harsh, difficult product quality control; Patent No. US3556932 U.S. Patent discloses the preparation of glyoxal modified polyacrylamide by glyoxal and cationic polyacrylamide reaction under weakly alkaline conditions, but when it is used as wet strength agent The usage amount is too high and has no practical value; the Chinese patent with the publication number CN101778873B discloses a preparation method of glyoxalated polyacrylamide, the basic preparation process of which is similar to the above two U.S. patents, and from the published patent According to the technical content, the product with an aqueous solution concentration of 11.5% has a maximum quality stability period of 28 days at 37°C, which is not conducive to long-distance transportation and storage, and causes a lot of inconvenience to the actual use of enterprises; in 2014, Miao Fei et al. Chemical Industry” published an academic paper on “Synthesis of Glyoxalated Polyacrylamide with High Solid Content”, which discussed in detail the relationship between the viscosity of low-concentration products and storage time. Prolonged, the faster the viscosity increases, the faster the quality decays

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