OPTIMIZATION OF GRAFT MODIFICATION CONDITIONS OF LIGNOSULFONATE

With viscosity and yield rate as the characterization constants, the effects of different initiators, temperature, acrylamide monomer, reaction time on graft co-polymerization of sodium lignosulfonate and acrylamide were investigated, and the sodium lignosulfonate graft copolymerization conditions were optimized. It was concluded that initiators K2S2O8can bring about larger viscosity and productivity. The effects of the monomer acrylamide amount,temperature and the reaction time were studied through three factors and three levels orthogonal test, as to the influence the monomer acrylamide amount was the primary,temperature was following and the reaction time was final, the optimum condition of graft copolymerization was K2S2O8dosage of 6 ×10-3 mol/L, the reaction temperature of 45 ℃, the reaction time of 4 h, the monomer acrylamide and sodium lignosulfonate ratio of 4:1, distilled water and sodium lignosulfonate of 5:1.