Preparation and Property of Poly (acrylamide-co-acrylic acid) Macromolecule Slow-releasing Fertilizer

The aim of the study was to prepare a poly (acrylamide-co-acrylic acid) macromolecule slow-releasing fertilizer (PMSF) by electrochemistry method. The acrylamide, acrylic acid and Urea were polymerized and grafted on the Ti/PbO2 electrode by adding the cerium (Ce(IV)) as initiator. Then after drying and smashing, the PMSF was obtained. The PMSF was characterized by infrared spectroscopy (IR) and thermo gravimetric Analysis (TG). The influence on concentrations of Urea and KH2PO4 were discussed. The contents of nitrogen, phosphorus and potassium in the PMSF were determined by the spectrophotometer. By simulating the process of release, the release mechanism of PMSF was obtained. The results showed that a new macromolecule slow release fertilizer which contends nitrogen, phosphorus and potassium can be prepared by electrochemical method. Both the IR and TG proved the existing of Urea in PMSF. The form of phosphorus and potassium in the MSRF existed by ions. The best technological parameters of the process were obtained: ω(AM)=9%,ω(AA)=4.1%,ω(Ce(IV)=1%,I=0.05， ω(Urea)=7.2%, ω(KH2PO4)=5.4%. The total contents of the nitrogen, phosphorus and potassium in the PMSF can achieve a content of 58.5%. Among which， nitrogen 32.5%, phosphorus 13%, potassium 13%. The effective components can release 80% within 60 days.