Study on Grafting Modification of Lignosulfonate and Acrylamide

[Objective]The study was to improve the water treatment capacity of lignosulfonate.[Method] With viscosity and yield rate as the characterization constants,the effects of different initiators on graft co-polymerization of sodium lignosulfonate and acrylamide were investigated.The effects of initiator dosage,temperature and monocase acrylamide dosage on viscosity of the graft copolymers were studied through orthogonal test and the reaction conditions were optimized.At the same time,the structures of raw materials and the modifier were analyzed.[Results] The effect of grafting reaction induced by K2S2O8/ Na2S2O3 was better,and the reaction products had the maximum viscosity,higher yield rate and smaller surface tension.The reaction products induced by(NH4)2Ce(NO3)6,(NH4)2S2O8 and(NH4)2Fe(SO4)2.6H2O/H2O2 had lower viscosity and lower yield rate.The optimum condition of graft co-polymerization was K2S2O8/ Na2S2O3 dosage of 6×10-3 mol/L,reaction temperature of 40 ℃,acrylamide dosage of 8 g.Under this condition,the modified products could be used as good flocculant.[Conclusion]The study optimized the condition of graft co-polymerization of lignosulfonate and acrylamide.