聚氨酯包膜尿素的制备
Preparation of Controlled-Release Polyurethane Coated Urea
周桂南1
作者信息
- 1. 湖南先进储能材料工程研究中心,湖南长沙410205
- 折叠
摘要
用异氰酸酯与聚氧化丙烯二醇(PPG)合成聚氨酯,再以其包裹尿素制成聚氨酯包膜尿素.采用比色法绘制聚氨酯包膜尿素的缓释曲线,讨论了异氰酸酯与羟基摩尔比(NCO/OH)、包膜率、反应方式、异氰酸酯、PPG分子量对包膜尿素缓释性能的影响.结果发现,以丙酮为溶剂,NCO/OH为1.1,在50～60℃的水浴温度下,PPG-3000先与MDI反应1 h、再与尿素反应2 h,得到的包膜率为5%的聚氨酯包膜尿素满足欧洲标准委员会的缓释肥料标准.
Abstract
Isocyanate and polyethylene oxide propylene glycol (PPG) were used to synthesize polyurethane coating material and polyurethane coated urea was obtained. The controlled-release curves of polyurethane coated urea was obtained by the colorimetry, and the influences of molar ratio of NCO/OH, coating rate, reaction mode, isocyanate and PPG molecular weight on the controlled-release performance of polyurethane coated urea were discussed. It was proved that 5 ％ polyurethane coated urea met the requirement for controlled-release fertilizer according to Europe Standard, which was prepared by PPG-3000 reacting with MDI for 1 h first and then reacting with urea for 2 h in acetone at 50～60℃ with NCO/OH of 1.1.
关键词
缓控释肥料/包膜材料/释放特性/聚氨酯/尿素Key words
controlled-release fertilizer/coating material/release characteristic/polyurethane/urea引用本文复制引用
出版年
2011
NETL
NSTL
维普
万方数据