| 聚氨酯包膜尿素的制备 |
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| 引用本文： | 周桂南. 聚氨酯包膜尿素的制备[J]. 化学与生物工程, 2011, 28(4): 83-85. DOI: 10.3969/j.issn.1672-5425.2011.04.024 |
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| 作者姓名： | 周桂南 |
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| 作者单位： | 湖南先进储能材料工程研究中心,湖南长沙,410205 |
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| 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-300...
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| 关 键 词： | 缓控释肥料 包膜材料 释放特性 聚氨酯 尿素 |
Preparation of Controlled-Release Polyurethane Coated Urea |
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| ZHOU Gui-nan. Preparation of Controlled-Release Polyurethane Coated Urea[J]. Chemistry & Bioengineering, 2011, 28(4): 83-85. DOI: 10.3969/j.issn.1672-5425.2011.04.024 |
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| Authors: | ZHOU Gui-nan |
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| Affiliation: | ZHOU Gui-nan(National Engineering Research Center of Advanced Energy Storage Materials,Changsha 410205,China) |
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| 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. |
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| Keywords: | controlled-release fertilizer coating material release characteristic polyurethane urea |
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