摘要
为探求不同的膜材、包膜工艺对尿素包膜的影响,改进包膜尿素生产技术。该研究选用3种不同膜材,分别采用侧喷与底喷两种工艺条件对颗粒尿素进行包膜,通过对包膜尿素表观状况进行电镜观察和水中溶出动态进行研究,结果发现:对于同一膜材而言,采用底喷包膜尿素的缓释效果好于采用侧喷的。对于包膜液黏度较大、雾化效果不佳、溶剂不易挥发的膜材,应选择底喷工艺进行包膜,对于黏度适中的包膜液采用底喷与侧喷工艺均可以获得较为满意的效果。
In order to investigate the effects of coating material and coating technology on the coated urea fertilizer,and to improve the production of coated urea,three kinds of commercially available polymers were chosen as test coating materials,and two kinds of fluidized-bed equipments（wurster and tangential spray fluidized-beds）were adopted to produce coated urea granules.The surface apparent characteristics of the granules were examined by scanning electron microscopy（SEM）,and the release rate of urea from the granules was determined in distilled water by kinetic-release experiments.The results showed that the same coating material adopted wurster fluidized-bed had better effect of slow-release comparing with adopted tangential spray fluidized-bed,and if the coating material had higher viscosity, poor pulverization ability and poor volatilization,wurster fluidized-bed would get better coating effects.For the coating materials with suitable viscosity,both wurster fluidized-bed and tangential spray fluidized-bed were available for obtaining a better slow-release effect of coated urea.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2010年第4期380-384,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家科技支撑计划资助项目(2006BAD10B01
2006BAD10B06)
中国科学院项目“东北绿色农业清洁规范生产关键技术研究与示范”(C04ADYNB0501)
农业部国家公益性行业科研专项计划项目“绿色农业科学研究与示范”(2007-3)
关键词
尿素
包膜材料
包膜工艺
扫描电镜
urea fertilizer
coated materials
coating techniques
scanning electron microscopy
