Inorganic Salt Solution Of Acrylamide In Dispersion Polymerization

Dispersion polymerization of acrylamide (AM homopolymer) and the copolymer of acrylamide and methacrylatoethyl trimethyl ammonium chloride (DMC) have been successfully carried out in aqueous ammonium sulfate media by using ammonium persulfate (APS)-sodium bisulfite (SHS) as initiator. The effects of influence factors such as reaction temperature, reaction time, the concentration of monomers and ammonium sulfate and the dosage of APS-SHS on the performance of the polymerization were investigated. The molecular structure, figure and particle size distribution of the polymers were analyzed by Infrared Spectrometer, Scanning Electron Microscope, Transmission Electron Microscope and Particle Size Distribution Analyzer. The mechanism of the dispersion polymerization was discussed. The flocculation efficiency of the polymers was inspected by flocculation experiments of wastewater which was simulated by Kaolin suspension.For AM homopolymer, the optimum reaction conditions of stable dispersion were: reaction temperature 40℃, time 3h, the concentrations of acrylamide, dispersant and salt 4%, 4% and 24% differently. Polydisperse spherical particles were formed in the system. It was found that graft stabilization mechanism was existed in this system through the study on the stabilization mechanism of dispersion polymerization. For AM-DMC copolymer, the optimum reaction conditions of stable dispersion were: reaction temperature 45℃, time 5h, the concentration of dispersant 2.8% and the dosage of salt 20.3%.The polymers as the flocculant used along with inorganic flocculant PAC had a good effect on flocculation. When the quality of PAM was 15mg/L, PAC 1.0mg/L or AM-DMC copolymer 12mg/L, PAC 1.5～2.0mg/L, the best flocculation efficiency was obtained. For the same flocculant, the greater the relative molecular mass, the better the flocculation performance.