【摘要】 淀粉接枝聚丙烯酰胺 (St g PAM)经胺甲基化、磺化和季胺化反应制得强阳离子型两性絮凝剂 ,探讨了反应物配比、反应温度、pH值、反应时间等因素对胺化度、阴离子化度、季铵化度的影响 ,确定了总的反应原料配比 :n(St g PAM)∶n(甲醛 )∶n(二甲胺 )∶n(亚硫酸氢钠 )∶n(环氧氯丙烷 ) =1 0∶1 2∶0 7∶0 4∶0 4 ,磺化最佳工艺条件 :t=6 5℃、pH =12、Time =3 0h ;季铵化最佳工艺条件 :t=5 0℃、pH =11、Time =3 5h ,淀粉基强阳离子两性絮凝剂的胺化度为 5 5 5mmol/g ,阴离子化度为 2 4 4mmol/g ,季铵化度为 2 5 5mmol/g。更多还原

【Abstract】 A new strong cationic amphoteric polymeric flocculant was prepared from a starch-g-polyacrylamide through aminomethylation, sulfonation and quaterization. The effect of the ratio of reagents, temperature, pH and reaction time on the degrees of amination, anion and quaterization were examined. The optimum synthesis conditions were as follows:the mole ratio of n(starch-g-polyacrylamide)∶n(formaldehyde)∶n(sodium- bisulfite)∶n(epoxy chloropropane) equal to 1∶1.2∶0.7∶0.4∶0.4, the conditions of sulfomethylation t=65 ℃, pH=12, time=3.0 h, and the conditions of quaterization t=50 ℃, pH=11, time=3.5 h. The degrees of amination, anion and quaterization in the product were 5.55 mmol/g, 2.44 mmol/g, and 2.55 mmol/g, respectively.更多还原