紫外激发丙酮-乙二醇引发制备离子型聚丙烯酰胺及其絮凝性能

Preparation and flocculation performance of ionic polyacrylamide initiated by acetone-EG under UV excitation

以丙酮-乙二醇(acetone-EG)作为新型引发剂,紫外激发引发单体共聚制备高分子量离子型聚丙烯酰胺,并研究聚合物对原生煤泥水的絮凝效果。将2-丙烯酰胺基-2-甲基丙磺酸(AMPS)阴离子功能单体和二甲基二烯丙基氯化铵(DDAC)阳离子功能单体分别或同时与丙烯酰胺(AM)共聚合成阴离子型聚丙烯酰胺(HPAM)、阳离子型聚丙烯酰胺(CPAM)以及两性型聚丙烯酰胺(APAM)。以离子型聚丙烯酰胺的特性黏数[η]作为指标,获取了该引发体系下每种类型聚丙烯酰胺的最优合成工艺参数,所制备的各类离子型聚丙烯酰胺的特性黏数可分别达到:[η]_(HPAM)=1760m L/g;[η]_(CPAM)=980m L/g;[η]_(APAM)=1120m L/g。用所制备的聚合物对煤泥水进行絮凝,结果表明HPAM用量3~4mg/L时,煤泥水浊度最低降到0.9FTU,絮凝沉降最大速度为61.6cm/min,APAM和CPAM用量4~5mg/L时有较好的絮凝效果,CPAM使煤泥水浊度最低降到1.3FTU,絮凝沉降最大为51.8cm/min,APAM使煤泥水浊度最低降到0.9FTU,絮凝沉降速度最大为58.2cm/min。

With acetone and ethylene glycol（acetone-EG） as new initiator,high molecular weight ionic polyacrylamide was polymerized under UV excitation,and the flocculation effect on primary coal slurry water was studied. Anionic polyacrylamide（HPAM）,cationic polyacrylamide（CPAM）,and amphiprotic polyacrylamide（APAM） were synthesized by copolymerizing acrylamide（AM） with 2-acrylamido-2-methylpropane sulfonic acid（AMPS） and dimethyl diallyl ammonium chloride（DDAC）,respectively or at the same time. Limiting viscosity number（[η]） of the ionic polyacrylamide was taken as main factor to evaluate the optimal synthesis process parameters for each type of polyacrylamide. Three type ionic polyacrylamide maximum limiting viscosity numbers can be reached： [η]（HPAM）=1760m L/g;[η]（CPAM） =980m L/g; [η]（APAM） =1120m L/g. When one of HPAM,CPAM and APAM was added to the primary coal slurry water as a flocculant agent and with the dosages of 3—4mg/L,4—5mg/L and 4—5mg/L,respectively,the lowest coal slurry turbidity could be reduced to 0.9FTU,1.3FTU and 0.9FTU,the maximum flocculation settling velocity was reached at 61.6cm/min,51.8cm/min and 58.2cm/min,respectively.