Method for preparing cation polyacrylamide dispersion

Abstract

The invention discloses a staged preparation method of cationic polyacrylamide dispersion. The cationic polyacrylamide dispersion is prepared in two-stage feeding manner of the method. A first stage comprises the steps as follows: feeding according to the solution polymerization formulation, and polymerizing to generate cationic polyacrylamide with low relative molecular weight as a dispersant ina second stage by adopting an oxidation-reduction initiator. The second stage comprises the steps as follows: continuously feeding on a basis of the first stage, and supplementing azo initiator for performing dispersion polymerization. The preparation method has the advantages of short reaction time, simple process, and low production cost. Not only a reaction device and a drying device, but alsoa large amount of precipitant required for preparing powdery dispersant are omitted, and the energy consumption is reduced. The qualified cationic polyacrylamide dispersion is in milk white, and is suitable for industries such as municipal sewage treatment, papermaking, etc.

Description

A kind of preparation method of cationic polyacrylamide dispersion technical field The invention relates to a preparation method of a cationic polyacrylamide dispersion, specifically a method for preparing a cationic polyacrylamide dispersion by two-stage feeding. Background technique Cationic polyacrylamide (CPAM) has good water-solubility, flocculation and viscosity-increasing properties, so it is widely used in many aspects such as sewage treatment, oil exploration, papermaking and so on. The existing synthesis methods of CPAM mainly include aqueous solution polymerization, inverse emulsion polymerization, inverse microemulsion polymerization and dispersion polymerization. Although these methods can produce products with higher relative molecular weights, they have their own shortcomings. The solid content of aqueous solution polymerization is generally low (5wt% ~ 10wt%), which is not suitable for direct transportation, so the solution polymerization product is often...

AI Technical Summary

Problems solved by technology

It is mainly to overcome the problems of large equipment investment, high energy consumption and high production cost caused by the separation of dispersant synthesis and dispersion polymerization in the existing dispersion polymerization process, and the purpose is to provide an economical and practical cationic polyacrylamide dispersion preparation method