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Study on the Synthesis and Performance of Novel Salt-tolerant Superabsorbent Resin

YAN Xiao-qian et al(Department of Thermal & Chemical Engineering,Shaanxi Institute of Technology,Xian,shaanxi 710302)  
The superabsorbent polymer with good salt tolerance was synthesized with acrylic acid grafted on xanthan gum through solution polymerization.The structure of this product was analysed by FTIR.The influence of the amount of the crosslinking agent,neutralization of acrylic acid,polymerization temperature and redox initiator ratio on the absorption capacity was studied.FTIR indicated that acrylic acid was grafted on xanthan gum.The optimum reaction conditions were determined as follows:reaction temperature 60 ℃,m(AA):m(xanthan gum)=6:1 and neutralization 70%,dosage of initiator 0.07 and cross-linking agent 0.04(based on mass of acrylic acid).It was also demonstrated that the amount of the crosslinking agent and initiator influenced to a certain extent the absorption resins for 0.9% NaCl solution while the neut ralized degree of acrylic acid had no significant impact on the absorption capacity.The results showed that the absorbent ability of this resin was 1 216 g/g for pure water and 421 g/g for NaCl solution.The speed of water absorption was moderate and water-retention ability were good.
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