反相乳液聚合法合成淀粉接枝丙烯酰胺的工艺研究

研究以玉米淀粉为原料,反相乳液体系中淀粉与丙烯酰胺接枝共聚反应规律。考察引发剂浓度、乳化剂用量、丙烯酰胺单体与玉米淀粉质量比接枝共聚反应的影响。通过单因素实验,获得最佳工艺条件:引发剂浓度为6mmol/L,乳化剂用量5%,丙烯酰胺单体与玉米淀粉的质量比为1.5∶1。在此条件下,可制备得到单体转化率95.46%、接枝效率88.12%、特性粘度410 mL/g的接枝共聚物,该接枝物比相对分子质量500万的聚丙烯酰胺的絮凝性能更好,在用量为25 mg/L时,对高岭土水样的浊度去除率达到88.6%。

Synthesis of Starch-Acrylamide Copolymer Using Inverse Emulsion Polymerization

The inverse emulsion copolymerization of starch and acrylamide using ceric ammonium nitrate（CAN） as initiator was studied. The factors of polymerization to graft eopolymerization reaction were discussed and the floccu- lating property of the copolymer product was determined using aqueous suspension of kaolin. The optimum conditions were that concentration of initiator was 6mmol/L, the amount of emulsifier was 5 %, m （acrylamide） ： m （cornstarch） was 1.5： 1. Under these conditions, starch - acrylamide copolymer could be prepared, and the monomer conversion, grafting eficiency and intrinsic viscosity were 95.46% ,88.12% and 410 mL/g,respectively. The graft copolymer has better flocculation effect. When the graft copolymer flocculant was 25 mg/L, the removal rate of turbidity was up to 88.6%.