Preparation and printing properties of acrylic acid grafted starch

Acrylic acid(AA) monomer was used to graft the corn starch which has been subjected to acidolysis,and the effects of the ratio of AA monomer and anhydroglucose unit(AGU),pH of AA solution,dosage of initiator,and reacting time and temperature on the graft rate of the resulting product water retaining property and PVID value were investigated.The grafted product was characterized by infrared spectroscopy(FT-IR).The optimized grafting process was acquired as follows: the ratio of n(AA)∶n(AGU)=2∶1,acrylic acid solution pH=6,the initiator ratio of n(H2O2)/n(FeSO4)=1.98∶1,n(H2O2)=0.529 mmol,grafting at 50 ℃ for 3 h.The graft rate of the grafted product is 5.14%,and the content of carboxyl is 4.02%.The water-retention property of the grafted product is 10.5 mm,and the value of PVID is 0.34.The properties of the grafted product are close to sodium alginate,indicating that it can be used as printing paste.