Preparation method of polyacrylamide with ultrahigh molecular weight

Abstract

The invention discloses a preparation method of polyacrylamide with an ultrahigh molecular weight. The method comprises the following steps of: adding a mixed monomer aqueous solution of acrylamide and sodium acrylate, a chain growth agent, an aid and a composite initiator into a polymeric kettle; introducing high-purity nitrogen for performing adiabatic copolymerization; and granulating, drying and smashing to obtain an anionic acrylamide copolymer with an ultrahigh relative molecular mass. By adopting the method, no hydrolytic reagent is added in a polymerizing process, so that harmful gases such as carbon dioxide, ammonia gas and the like are not produced, and environmental pollution is avoided.

Description

【Technical field】 [0001] The invention relates to a method for preparing an acrylamide copolymer, in particular to a method for preparing an ultrahigh molecular weight polyacrylamide. 【Background technique】 [0002] At present, high relative molecular weight anionic polyacrylamide is mainly prepared by two aqueous solution polymerization methods: one is the "one-step method" in which a hydrolyzing agent is added during the polymerization of acrylamide, and hydrolysis is carried out at the same time. The advantage is that the preparation process is simple, The polymer is hydrolyzed uniformly and has good solubility, but a large amount of harmful gases such as carbon dioxide and ammonia will be produced during the preparation process, polluting the environment, and it is not easy to prepare ultra-high molecular weight anionic polyacrylamide; the other is to polymerize in an aqueous solution of acrylamide The "two-step method" that does not add a hydrolyzing agent during the po...

AI Technical Summary

Problems solved by technology

[0002] At present, high relative molecular weight anionic polyacrylamide is mainly prepared by two aqueous solution polymerization methods: one is the "one-step method" in which a hydrolyzing agent is added during the polymerization of acrylamide, and hydrolysis is carried out at the same time. The advantage is that the preparation process is simple, The polymer is hydrolyzed uniformly and has good solubility, but a large amount of harmful gases such as carbon dioxide and ammonia will be produced during the preparation process, polluting the environment, and it is not easy to prepare ultra-high molecular weight anionic polyacrylamide; the other is to polymerize in an aqueous solution of acrylamide The "two-step method" that does not add a hydrolyzing agent during the polymerization and then adds a hydrolyzing agent for hydrolysis has the advantage of being able to prepare high-molecular-weight anionic polyacrylamide, but its polymerization process is complicated and the hydrolysis is uneven. It will also produce a large amount of harmful gases such as carbon dioxide and ammonia, which will pollute the environment.