Synthesis and characterization of modified attapulgite/poly(aspartic acid) compound absorbent resin

摘要

In this work, modified attapulgite/poly(aspartic acid) (MATP/PAsp) composite superabsorbent resin with 3-D network structure was prepared by the method of solution polymerization, wherein we used polysuccinimide(PSI) as interdiemate, attapulgite (ATP) as the filling material, -aminopropyl triethoxysilane (KH-550) as the modifier, and 1,6-hexamethylenediamine as the crosslinking agent. For further identification of microstructures of this resin, transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were adopted. Influences of the particle size, addition, and modification time on the absorbency performances of resin were investigated respectively. It was found that there is a significant improvement in micro structure with the introduction of MATP, and the water absorbency and retention performance were also increased. The optimum MATP/PAsp composite resin was obtained under condition of particle size range of 45 mu m-54 mu m, addition dopant of 2wt%, modification time of 6.5h. The swelling ratio of composite resin in distilled water and normal saline were 892g g(-1) and 95g g(-1), respectively, which had 23% and 30% increase compared the case of none-composite resin samples. The water-retention rate for composite resin was measured to be 66.12% after 6h's constant temperature drying at 50?, which is higher by 7.72% than none-composite resin.