生物炭改性聚丙烯酸酯包膜控释肥料的研制

Development of biochar modified polyacrylate emulsions coated controlled release fertilizers

选用生物炭并结合氮丙啶及三聚氰胺对水基聚丙烯酸酯乳液GA-1711进行改性,以获取肥料包衣控释材料。测定了各改性材料溶胀度和力学性质,并对改性材料的表面形态和结构组成等进行了表征,在此基础上研制了包膜控释肥料,进而测定了其养分累积释放率。结果表明,不同材料改性的乳液效果显著,生物炭与氮丙啶交联剂耦合改性模型膜强度增加,延长了包膜肥料控释期,而三聚氰胺改性增强了模型膜的强度,却缩短了包膜肥料的控释期。氮丙啶与生物炭耦合改性聚丙烯酸酯乳液在水基包衣控释肥料中具有广阔的应用前景。

Biochar were used to modify the waterborne poly acrylate emulsion GA-1711 combining aziridine and melamine. Different polymer coated fertilizers were developed and nutrients release profiles from those fertiliz ers were detected based on swelling capacity, mechanical property, surface topography and structural properties of different polymer model membranes. The results showed the properties of different modified polymer varied. Tensile strength of biochar and cross-linker aziridine co-modified polymer model membranes were increased and controlled release duration became longer, while controlled release duration of melamine modified coated fertil izer decreased. Biochar and cross-linker aziridine co-modified polyacrylate emulsions were demonstrated as promising controlled release materials for controlled release fertilizer.