Synthesis Of Modified Cationic Polyacrylamide And Researches Of Flocculation Properties

In this paper, the synthesis and application of the cationic polymer flocculant were researched and discussed. Dual copolymerization cationic polyacrylamide was synthesized with acrylamide(AM) and dimethyl diallyl ammonium chloride(DMDAAC), methacry loyloxyethyl trimethyl ammonium chloride(DMC), acyrloxyethyl trimethyl ammoniumchloride(DAC) separately, as raw materials, through the aqueous solution polymerization. On the basis of these, we synthesized ternary copolymer of cationic polyacrylamide. Then took this terpolymers react with hyperbranched polyamide. The structure of products'characteristic by Fourier transform infrared spectrometer of Bruker-Tensor27, and we discussed the impact on the flocculation, throgh determined the intrinsic viscosity, cationic degree of the copolymer. The results of optimized conditions experiment showed that the concentration of monomer was 30%, the molar ratio of DMDAAC and AM is 3:7, the reaction temperature was 30℃, the amount of initiators at the low temperature stage was 0.05‰(compared to the weight of the monomers joining the polymerization), the molar ratio of K2S2O8 to NaHSO3 is 1:2, while azoisobutyronitrile was initiators at the high temperature stage, ascertain the optimum dosage which is 0.125‰, auxiliaries for the dissolution of carbamide, EDTA disodium (EDTA-2Na) complexing agent for polymerization, nitrogen to oxygen displacement agent, then the high molecular weight cationic polyacrylamide (CPAM)(M= 619×104) could be got. The properties experiment of asp flooding simulated sewage on product, put not grafted cationic polyacrylamide, cationic modified or unmodified amino grafting hyperbranched polymer polyamide and different acrylic content grafted polymer flocculation properties are compared. Experimentally derived, graft better than no graft polymer, the modified hyperbranched polyamidoamine grafted with a more obvious flocculation. The results showed that the cationic polymer which obtained through reaction of acrylic acid terpolymer content of 30% and modified hyperbranched polyamidoamine had the best flocculation for the simulated oilfield water which was treated could reach a maximum transmission rate of 94.3%.