微米级可降解性高吸水树脂微球的制备工艺

Preparation Technology of Biodegradable Superabsorbent Microspheres with Micron-Sized Meter

以淀粉与丙烯酸(AA)/丙烯酰胺(AM)为原料,采用接枝共聚的方法,在低油水比的反相悬浮体系中制备微米级可降解高吸水树脂微球,探讨了油水比、中和度、分散剂、引发剂、交联剂对树脂性能的影响.结果表明,对产物的粒径和吸水倍率影响程度由大到小依次为:丙烯酸中和度、油水比、分散剂用量、引发剂用量、交联剂用量.研究得到的最佳工艺条件为:丙烯酸中和度0.7,油水比2.5∶1,分散剂用量0.7g,引发剂用量(占单体总质量)0.3%,交联剂用量(占单体总质量)0.057%;得到产物的粒径约为1.5μm,吸水倍率为290.93g/g.

The micron-sized superabsorbent microspheres were prepared by the graft copolymerization of starch and acrylic acid/acrylamide in the inverse suspension system with low oil/water ratio. The effect of oil/water ratio, degree of neutralization, the amount of dispersant, initiator, and crosslinker on the properties of the resin was investigated systemati- cally. The results showed that the order of the influence degree on radius and water absorption rate of the resin from high to low was as follows： neutralization degree of acrylic acid, the oil water ratio, the amount of dispersant, the amount of initiator, the amount of crosslinker. The optimum technological conditions were as follows： the neutralization degree of acrylic acidis 0.7, the oil-water ratio was 2.5 ： 1, the dispersant dosage was 0.7 g, the initiator dosage was 0.3 % （the percentage of the total mass of monomer） and the crosslinker dosage was 0. 057% （the percentage of the total mass of monomer）, the product＇s water absorbency was 290.93 g/g, and particle size was about 1.5 μm.