Preparation method of extra high molecular cation polyacrylamide

Abstract

The present invention relates to an extra-high molecular cation polyacrylamide preparation method. Said preparation method includes the steps of copolymerization of acrylamide and ammonium (methyl) acryloyloxyethyltrimethyl chloride aqueous solution, monomer refinery, purification, adding multicomponent initiator and additive, polymerization, heat-insulating, granulating, drying, pulverizing and sieving so as to obtain the invented extra-high molecular cation polyacrylamide whose molecular weight is 23000000 and dissolving speed is less than or equal to 30min. The invented product can be used as water-purifying agent for treating waste water and sewage in the several extensive fields.

Description

Technical field:

[0001] The invention relates to a method for preparing ultra-high molecular weight cationic polyacrylamide, which belongs to the technical field of chemical industry Background technique:

[0002] At present, the commercially available cationic polyacrylamide has a molecular weight of 5-10 million, a dissolution rate of 1-3 hours, and a high content of residual monomers and insolubles. Its preparation method is to mix acrylamide and cationic monomers in different proportions. Generally, the aqueous solution copolymerization method is adopted. Nitrogen gas is introduced into the system to remove oxygen, and an oxidation-reducing agent (persulfate-sodium sulfite or ferrous sulfate) is added. The water-soluble azo salt that initiates in the high temperature stage generally has a polymerization concentration of 40%. The polymerization is initiated at a temperature of 30-40°C. The process equipment used is box type or sheet polymerization, and heat preservation i...