Abstract: Acrylic acid (AA) monomer was used to graft corn starch with acidolysis. It were discussed the properties of grafted products including water-retention property, the value of PVID and the graft rate, which were influenced by the ratio of acrylic acid monomer and corn starch left radicals (AGU), the value of acrylic acid monomer pH, the dosage of initiator, the reaction time and temperature, and grafted products were characterized using infrared spectroscopy (FTIR). The optimization graft process was acquired as follows: the ratio of n(AA):n(AGU)=2:1, the value of acrylic acid monomer pH was 6, the initiator ratio of n(H2O2)/n(FeSO4)=1.98,grafting at 50℃ for 3h. The graft rate of grafted product was 5.14%, and content of carboxyl was 4.02%. The water-retention property of grafted product was 10.5 mm, the value of PVID was 0.34. The properties of grafted product which could be used for printing paste was similar to sodium alginate.

Key words: corn starch, grafting-reaction, printing property, acrylic acid