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以壳聚糖和KC l为主要原料制备壳聚糖包膜KC l的微球,测定了微球在25℃水中浸泡后K+的释放速率,并应用扫描电子显微镜对浸泡前后微球表面膜结构进行表征。结果表明:壳聚糖对K+的包埋率达到97.08%;K+释放量增量表现为,1-4 d快速上升,5-59 d稳定上升,60 d后开始减缓。扫描电镜观察结果表明:微球浸泡前表面膜结构密实;浸泡73 d后微球表面膜形成大量突起、均匀的小孔。24和28 d包膜微球在水中的释放量均符合缓释肥料标准。
The chitosan-coated KCl microcapsules were prepared by using chitosan and KCl as the main raw materials. The release rate of K + after soaking the microspheres in water at 25 ℃ was determined. The surface membrane structure of the microspheres before and after immersion was analyzed by scanning electron microscopy Characterization. The results showed that the embedding rate of chitosan to K + was 97.08%. The increasing amount of K + increased rapidly from 1 to 4 days and steadily from 5 to 59 days, then began to decrease after 60 days. The results of scanning electron microscopy showed that the microstructure of the microspheres was dense before immersing. After soaking for 73 d, the microspheres formed a large number of protuberant and uniform pores on the surface membrane. The released amounts of 24 and 28 d coated microspheres in water all met the standard of slow release fertilizer.