Dispersion Polymerization Of Modified Polyacrylamide

Two kinds of modified PAM have been prepared. They were AM-AA copolymer andAM-DMDAAC copolymer. Different polymerization parameters were inspected for thepurpose of making the copolymer with higher molecular weigh and more stable dispersion.The structure propertys of the copolymers were analysed by IR, TEM and laser particlesize instrument. The flocculation efficiency of the modified PAM was inspected byflocculation experiment.When the concentration of initiator KPS-SHS was 0.20%-0.20% for the monomerquality, the reaction temperature was 50℃and the reaction time was 5h, the AM-AAcopolymer with higher molecular weigh, more stable dispersion, and more symmetricalgrain-size was produced. It is found that graft stabilization mechanism was existed in thissystem through the study on the stabilization mechanism of dispersion polymerization.When the concentration of initiator V₅₀ was 1.25% for the monomer quality, the volume ofethanol was 20% for the component solvent, the reaction temperature was 50℃, and thereaction time was 3h, the AM-DMDAAC copolymer with higher molecular weigh, morestable dispersion, and wider scope of grain-size distribution was produced.The modified PAM as the fiocculant used along with inorganic flocculant PAC, hadgood flocculation effect. By comparing with commercial PAM, the insufficiency ofself-made modified PAM was slower sedimentation rate, and the strongpoint was widerflocculation scope. It was advantageous to use it to complex and changeable system.