Absorption property of superabsorbent polymer according to the ratio of surface-crosslinking medium solution
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초록
내용
We synthesized core-superabsorbent polymer (core-SAP) by aqueous solution polymerization using carboxylized acrylic monomer and vinyl sulfonic acid. The absorption properties of SAP are closely related to the crosslinking density of SAP matrix. In this study, we adjusted surface-crosslinking density on the SAP particles to improve the absorption properties. This made it possible to achieve adequate property of CRC and AUL, despite their trade-off relationship. The surface-crosslinking reaction was done by mixing the core-SAP with ethylene glycol diglycidyl ether as a surface-crosslinker using medium solution and then heating at 120 °C for 10 minutes. We confirmed the structure of SAP using FT-IR and measured absorption properties such as centrifuge retention capacity and absorbency under load in 0.9 wt.% NaCl solution. Consequently, we obtained the optimum composition ratio of the surface-crosslinking medium solution and the content of surface-crosslinking agent.