Synthesis of High Molecular Weight Cationic Polyacrylamide

摘要

Cationic polyacrylamide is a derivative of polyacrylamide, a cationic polymer flocculant which has an excellent effect on sewage treatment. Our existing cationic polyacrylamide are mostly prepared by the Mannich reaction, which has the shortcomings of more unreacted material, low cationic degree, poor stability, short validity, etc. Therefore, a cationic polyacrylamide has been prepared by aqueous solution. P(DAC-AM) was synthesized by aqueous copolymerization of acrylamide (AM)and DAC using complex initiated system consisted of (NH_4)_2S_2O_8, NaHSO_3 and V-50. Mass percent of monomer, amount of initiator, content of cation monomer, pH, reaction time et al on the effect of intrinsic viscosity of polymer were discussed. The suitable conditions of synthesis were concluded. Mass concentration of monomers: 35%, initiator amount 0.06%, V-50 amount 0.005%, pH: 5.5～6.5, urea concentration 0.1%, EDTA 0.02%, β-dimethylaminopropionitrile concentration 0.03%, reaction time 5～6h, the intrinsic viscosity of product is 13.95dL·g~(-1).