均聚法制备高分子量聚丙烯酰胺

Synthesis of high molecular weight polyacrylamide by homopolymerization

以双官能度氧化还原引发体系为主,配合其它引发剂组成新型复合引发体系,在低温条件下采用均相水溶液聚合法引发丙烯酰胺均聚。再采用均聚后水解工艺路线制备高分子量聚丙烯酰胺。考察各项因素对聚合反应及水解反应的影响,最终确定最优化工艺条件。聚合条件为:单体浓度0.0042mol/g,偶氮0.34‰,Span 2020mg/L,尿素400mg/L,体系温度3℃,氧化还原引发剂10mg/L,EDTA60mg/L,甲酸钠10mg/L,聚合分子量为2.062×107。水解条件为温度90℃,尿素500mg/L,水解度30%,胶体含量12%,NP 10用量200mg/L,水解时间3.0h,水解分子量为2.262×107。

In the paper, using a new combined initiating system, bifunctional redox system and other initiations, to polymerize acryl amide with homopolymerization post hydrolysis process and low initiating temperature, high molecular weight polyacrylamide was synthesized. Many factors in the polymerization and hydrolysis are studied, and optimum process parameters are obtained. Polymerization conditions: monomer concentration 0.0042mol/g, double nitrogen0.34‰, Span-20 20mg/L, urea 400mg/L, temperature 3℃, redox initiating 10mg/L, EDTA 60mg/L, natrium formate 10mg/L,molecular weight was 2.062×10~7. Hydrolysis conditions: temperature 90℃, urea 500mg/L, hydrolysis grade 30%, colloid content 12%,NP-10 200mg/L, hydrosis time 3.0h, molecular weight was 2.262×10~7.