【摘要】 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。更多还原

【Abstract】 The micro-ball of potassium coated by chitosan was prepared by using chitosan and potassium chloride as materials.The K~+ releasing rates of the micro-ball soaked in water(25 ℃) were detected and the apparent shapes of the micro-ball were examined by scanning electron microscope(SEM).The results showed that,the enveloped rate of K~+ in the micro-ball was 97.08%;the K~+ releasing curve was performed ascending sharply in 1-4 days,then climbing stably in 5-59 days and rising slowly after 60 days.The SEM results showed that the surface of micro-ball was compact and tight before soaked in water,but porous and expansile after soaked 73 days in water.The properties of micro-ball measure up to the criterion of slow-release fertilizers.更多还原