木质素磺酸盐接枝改性的条件优化

以粘度和产率为表征,研究不同引发剂、温度、单体丙烯酰胺用量、反应时间对木质素磺酸钠与丙烯酰胺接枝共聚反应的影响,并对木质素磺酸钠接枝共聚条件进行优化。结论:K2S2O8引发的接枝反应产物具有较大粘度和产率,而(NH4)2S2O8、Na2S2O3·5H2O引发体系得到共聚物粘度和产率相对较小,所以该研究采用K2S2O8作为引发剂;通过三因素三水平的正交试验得出对共聚物的产率与粘度的影响顺序为单体丙烯酰胺用量大于反应温度大于反应时间;接枝共聚反应的优化条件是K2S2O8引发剂浓度6×10-3mol/L,反应温度为45℃,反应时间为4 h,单体丙烯酰胺与木钠比为4:1,蒸馏水与木钠比5:1。

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 K2S2Os can 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 primapy, temperature was following and the reaction time was final, the optimum condition of graft copolymerization was K2S208 dosage 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.