高吸水树脂的共聚组成与微球性能

采用反相悬浮聚合法,制备了部分中和的丙烯酸(AA)与丙烯酰胺(AM)共聚的球状高吸水树脂。研究了不同单体组成对微球的共聚组成、吸液性能和颗粒形态的影响。结果表明,在碱性水介质中,AM是竟聚率较小的单体,间歇共聚合的共聚物微球的组成是不均一的。微球的吸水能力随AM含量的增大而降低,当AM在共聚单体中质量分数为30%时,树脂对盐水的吸收能力具有协同效应,表明非离子型单体的耐盐性较好。显微镜观察表明,部分中和的聚丙烯酸微球为规整的球形,而共聚物微球则为不规整的球形。

Composition and Performance of Spherical Superabsorbent Copolymer

The superabsorbent copolymers of partially neutralized acrylic acid(AA) and acrylamide(AM) were prepared by inverse suspension polymerization in the presence of crosslinking agent of N,N′-methylenebisacrylamide.The influence of monomer composition on copolymer composition,absorption characteristics and microsphere morphology was investigated.The reactivity ratio of AM was smaller than that of AA in the copolymerization so that the copolymer composition of microspheres was inhomogeneous in batch process.The water absorption capacity of crosslinked microspheres decreased with the increase of AM contents.But the absorptions of copolymer in salinity water exhibited synergic efficiency when the content of AM in monomer was 30%(mass ratio).The microsphere morphology of polymer of partially neutralized AA was spheric regularly,while that of the copolymer of AA and AM was spheric irregularly.