Study on Xanthan Gum-based Super Absorbent Resin Prepared by Graft Modification

A new type of xanthan gum-based super absorbent resin was prepared by graft copolymerization modification,which used acrylic acid and acrylamide as monomers in the way of solution polymerization in this study.The impact factors of synthesizing super absorbent resin such as the amount of initiator,polymerization temperature,the neutralization degree of acrylic acid,the weight ratio of xanthan gum and AA/AM and the amount of cross-linking agent were discussed by using orthogonal experiment.The fourier infrared spectroscopy(FTIR) and scanning electron microscopy(SEM) were used to the characterization of copolymer.The results show that the best synthesis temperature of graft copolymerization is 65 ℃,the weight ratio of xanthan gum and AA/AM is 1∶5∶1,the mass fraction of initiator is 1.5%,the neutralization degree of acrylic acid is 70% and the mass fraction of cross-linking agent is 0.06%.The results of FTIR characterization show that acrylic acid and acrylamide are grafted to the molecular chain of xanthan gum.The SEM observation results show that the resin forms a porous network structure.Under the optimum conditions of synthesizing xanthan-based absorbent resin,the water absorption is up to 869.0 g/g,the normal saline is up to 126.7 g/g.The resin was good for reusing.