Method for preparing macromolecule cation polyacrylamide

Abstract

The invention provides a method for preparing high molecular cationic polyacrylamide, which comprises the following steps: refining the acrylamide aqueous solution; heating and purifying the obtained acrylamide aqueous solution, vacuum flash evaporation, deionizing the resin, filling nitrogen to remove oxygen, and extracting pure Aqueous acrylamide solution: add water and an initiator to the pure acrylamide aqueous solution, put it into a polymerization tank, and carry out polymerization reaction by irradiating with a halogen lamp. The obtained polyacrylamide is coarsely granulated, and then finely granulated to obtain polyacrylamide granules; the obtained polyacrylamide granules are dried, screened, pulverized, and packaged for storage. The method relies on halogen light as the polymerization power, and combines with an appropriate amount of initiating functional additives to obtain high-molecular cationic polyacrylamide, and has the characteristics of short polymerization time, stable reaction and low production cost.

Description

technical field [0001] The invention relates to a preparation method of polyacrylamide, in particular to a preparation method of polymeric cationic polyacrylamide, which belongs to the technical field of chemical industry. Background technique [0002] At present, the main disadvantages of cationic polyacrylamide in China are: low molecular weight, long dissolution time, many monomer residues, large dosage, unsatisfactory decontamination effect, and cannot meet the needs of different environmental protection industries; usually, its preparation method is: First mix polyacrylamide and cationic monomers in different proportions, then use aqueous solution copolymerization method, pass nitrogen gas into the system to remove oxygen, add redox agent, and also add water-soluble azo salt that acts as an initiator at high temperature stage, the polymerization concentration Generally 40%, polymerization is initiated at 30-40°C, the process equipment used is box type, and heat preserva...

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Problems solved by technology

[0002] At present, the main disadvantages of cationic polyacrylamide in China are: low molecular weight, long dissolution time, many monomer residues, large dosage, unsatisfactory decontamination effect, and cannot meet the needs of different environmental protection industries; usually, its preparation method is: First mix polyacrylamide and cationic monomers in different proportions, then use aqueous solution copolymerization method, pass nitrogen gas into the system to remove oxygen, add redox agent, and also add water-soluble azo salt that acts as a trigger at high temperature stage, the polymerization concentration Generally 40%, polymerization is initiated at 30-40°C, the process equipment used is box type, and heat preservation is carried out to reduce the residual monomer content

The polymer gel obtained by this type of method has high viscosity, low molecular weight, and is not easy to granulate; the material is placed in a tray and enters the oven in layers, and is dried by hot air. Because the materials are statically bonded to each other, the molecular weight is seriously degraded. The heated product has poor solubility, high content of insoluble matter, long polymerization cycle, high drying energy consumption, small output and unstable product quality.

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