A kind of preparation method of polyacrylamide for papermaking retention and drainage aid

Abstract

Provided is a preparation method of polyacrylamide for paper-making retention aiding and drainage aiding. The method includes the following methods that 1, acrylamide and deionized water are mixed by the mass ratio of (1:3) to (2:7), and a monomer solution is obtained; 2, acryloyloxyethyl trimethyl ammonium chloride and 3-acrylamidepropyl-trimethyl ammonium chloride are added into the monomer solution obtained in the step 1, and the pH-value is adjusted to 4-4.5; 3, mixed initiators are added into a mixed solution obtained in the step 2, and at the same time, nitrogen gas of which the purity is greater than 99.9% is introduced; 4, a chain extender is added into a mixed solution obtained in the step 3, and 5-9 minutes after the addition, a chain terminator is added; 5, when heating on the system is stopped, colloid is taken out, drying, pulverizing, granulating and secondary drying are conducted on the colloid, and the polyacrylamide for the paper-making retention aiding and drainage aiding is obtained. By the adoption of the preparation method, the dissolution time of the prepared polyacrylamide is within 30 minutes, the retention rate can be more than 96%, the filtration rate in the filtration aiding process can be more than 94%, wet-part chemical conditions can retain stable, and the load of waste water treatment is reduced.

Description

technical field [0001] The invention belongs to the field of functional polymers, in particular to a preparation method of polyacrylamide for papermaking retention and drainage. Background technique [0002] Polyacrylamide (PAM) has a wide range of uses in the paper industry. Its functions include improving the uniformity of the paper, improving the dehydration performance of the pulp, as a retention and drainage aid in the wet end of the paper machine, and improving the retention of fine fibers and fillers. efficiency, reduce the consumption of raw materials and environmental pollution; the degree of polyacrylamide ionicity determines the speed of dissolution, high ionicity will shorten the dissolution time, low ionicity will relatively long dissolution time, but polyacrylamide ionicity exceeds When the molecular weight is 35%, the molecular weight will decrease, and when the ionicity is lower than 10%, although the molecular weight can be kept unchanged, the dissolution ti...

AI Technical Summary

Problems solved by technology

[0002] Polyacrylamide (PAM) has a wide range of uses in the paper industry. Its functions include improving the uniformity of the paper, improving the dehydration performance of the pulp, as a retention and drainage aid in the wet end of the paper machine, and improving the retention of fine fibers and fillers. efficiency, reduce the consumption of raw materials and environmental pollution; the degree of polyacrylamide ionicity determines the speed of dissolution, high ionicity will shorten the dissolution time, low ionicity will relatively long dissolution time, but polyacrylamide ionicity exceeds When the molecular weight is 35%, the molecular weight will decrease. When the ionicity is lower than 10%, although the molecular weight can be guaranteed to remain unchanged, the dissolution time will be greatly prolonged.

[0003] At present, the dissolution time of polyacrylamide used in domestic papermaking is between 1h and 2h. Due to the long dissolution time, it directly affects the retention rate and water drainage of pulp when it is online, and the paper quality and pulp saving effect are not ideal.