反相悬浮法合成交联微球的工艺及吸水性能研究

以丙烯酸、丙烯酰胺为主要单体,N,N-亚甲基双丙烯酰胺为交联剂,采用反相悬浮聚合法合成出交联微球。研究了搅拌效率、分散剂、交联剂、协同引发剂等参数对聚合工艺的影响。结果表明:分散剂用量越大,转速越高,微球粒径越小;当转速为450r/min,分散剂用量为29%时,微球粒径为15μm;当交联剂用量为0.1%时,吸淡水倍率达到最大值980g/g,但交联剂对粒径影响不大。在矿化水中,交联微球的吸水率迅速下降,离子强度越大,下降幅度越大。随着微球的粒径变小,吸水率越大;当粒径为50μm左右时,最大吸水率达到极值。加入助引发剂AIBN后,微球粒径由微米级下降至纳米级。

STUDY ON PREPARATION PROCESS AND HYGROSCOPIC PROPERTIES OF POLYMER MICRO-SPHERE SYNTHESIZED WITH INVERSE SUSPENSION METHOD

The crosslink micro-spheres were prepared based on the monomers of acrylamide,crylic acid and the cross-linking agent of N,N′-Methylene bisacrylamide(MBA) by inverse suspension process.Effects of stirring rate,dispersant,cross-linking agent and co-initiator on the polymerization process were studied.The experimental results showed that the greater the dispersant dosage and the stirring rate were,the smaller the micro-spheres would be.The size of micro-spheres would be about 15 μm when stirring rate was 450 r/min and dispersant dosage was 29%.It was also observed that the content of crosslink monomer had great effect on water absorption ratio.When the dosage of cross-linking agent was 0.1%,the distilled water absorption ratio reached a maximum of 980 g/g,but it has little effect on the size of micro-spheres.Water absorption ratio decreased rapidly in salinity water.The greater the ionic strength was,the more the bibulous rate would decrease.With the decrease of the size of micro-spheres,the bibulous rate would become greater.When the size was about 50 μm,the bibulous rate reached the maximum.When we added initiator AIBN to system,the size of micro-spheres fell from micron level to nanometer level.