稻米淀粉接枝丙烯酰胺共聚物的合成及性能分析

以稻米淀粉和丙烯酰胺为原料,过硫酸钾和亚硫酸钠为引发剂,乙二胺四乙酸二钠和尿素为助剂,采用水溶液聚合法制备淀粉接枝丙烯酰胺聚合物絮凝剂。分析了反应温度、引发剂浓度、助剂浓度对产物支链特性黏度的影响,考察了接枝共聚产物不同添加量对赤泥沉降分离效果。结果表明:反应体系中引发剂浓度各为2.22×10-3 mol/L,乙二胺四乙酸二钠浓度为2.68×10-4 mol/L,尿素浓度为0.133 mol/L,40℃下反应得到的接枝共聚物支链特性黏度超过1 100 mL/g,处理赤泥矿浆前5 min的赤泥平均沉降速度为0.021 7 cm/h,上清液的浊度为340NTU。

Synthesis of Rice Starch and Acrylamide Graft Copolymers and Its Properties Evaluation

With rice starch and acrylamide as raw materials, potassium sulfate/sodium sulfite as initiator, ethyl- enediaminetetraacetic acid disodium salt and urea as additives, the aqueous solution polymerization method was used to prepare the starch grafted acrylamide polymer flocculant. The influence of the reaction temperature, the initiator concentration, additives concentration on the polymerization product side chain characteristic viscosity was investigated. Meanwhile,the effect of the grafting copolymerization product on the red mud settlement separation was also study. The results showed that the concentration of initiator is 2.22 × 10^-3 mol/L, the concentration of ethylenedia- minetetraacetic acid disodium salt is 2.68 × 10^-4 mol/L,urea concentration is 0. 133 mol/L,the temperature of 40 ℃, the graft copolymer molecular branch chain characteristic viscosity was more than 1 100 mL/g. Dealing with the red mud slurry, the average settling rate of red mud in initial five minutes is 0.78 m/h, and the supernatant turbidity is 340 NTU.