Preparation of super absorbent resin modified by graft copolymerization based on attapulgite clay/xanthan gum

The xanthan gum(XG) was grafted and modified by acrylic acid(AA) and acrylamide(AM) monomers,then a new type of super absorbent composite resin was prepared by solution polymerization when N,N′-methylenebis-acrylamide(NMBA) and ammonium persulfate(APS) were used as cross linker and initiator respectively,and attapulgite clay was introduced into systems.The influences of neutralization degree of AA,cross linker and initiator contents,polymerization temperature and attapulgite clay contents on water(or saltwater) absorption of resin were investigated by single factor experiment.The structure and thermal performance of resin were characterized by Fourier transform infrared spectroscopy(FT-IR) and thermogravimetry(TGA).The results showed that the optimum process conditions of preparing super absorbent resin were obtained when neutralization degree of AA was 70%,reaction temperature was 70 ℃,mass fractions of cross linker,APS and attapulgite clay were 0.06%,1.0% and 5% respectively.The super absorbent resin,which was prepared under optimum process conditions,had maximum water absorption(827 g/g) and saltwater absorption(109 g/g).