One superabsorbent resin (SAR) was synthesized by solution copolymerization with starch

kaolin

acrylic acid as the main raw materials. The influences of mass ratio of monomers to starch

degree of neutralization of acrylic acid

amount of cross-linking agent and initiator on the absorbency were studied to optimize the preparation condition. The absorbencies of the best sample thus synthesized can be up to 1195.4 g·g-1 in distilled water and 90.1 g·g-1 in saline solution (0.9%

mass). The results of Fourier Transform Infrared Spectroscopy (FTIR) showed that OH in kaolin participates in the polymerization reaction

enhancing the crosslinking extent and increasing the absorbency of sample. SEM results revealed that the SAR sample had the multi-porous and layered structure. The experiments of thermal stability indicated that SAR synthesized in this paper had the stable absorbency under 100℃.