Synthesis of cationic and weight molecular flocculant used in sludge dewatering

The copolymers of acrylamide with acrylamide,methyl acryloyloxyethy trimethyl ammonium chloride and acryloyloxyethy trimethyl ammonium chloride as flocculant used in sludge-dewatering have been prepared by free radical polymerization in aqueous solution,by using K2S2O8-NaHSO3 and V-50 compound initiation system.The major factors affecting the polymerization reaction were investigated,including the concentration of monomer and the amount of initiator.And the best polymerization conditions were found out with the method of orthogonal design.When m(AM)∶m(AETMAC)∶m(DMC)=2 ∶1∶1,the monomer concentration is 25%,the initiator fraction is 0.015%,the V-50 fraction is 0.075%.Under these conditions can attain polymer with characteristic viscosity of 16 dL/g.