Effect of Filler Treatment on the Release Properties of Coating on Urea Granules |
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| Authors: | Lixia Li Bing Cao Yumeng Sun Wenping Yi Xiaohui Ni |
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| Affiliation: | 1. Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China;2. Research Center of Beijing Municipal Slow and Controlled Release Fertilizers Engineering Technology, Beijing, China |
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| Abstract: | Polyurethane composite coatings on urea granules were prepared by SBA-15 mesoporous silica (in as-synthesized and calcined forms) as a pseudo-crosslinker without any other chain extenders. The calcination of mesoporous silica leaded to reduction of hydroxyl groups and increase of mesopores. The composite coating containing calcined SBA-15 showed enhanced controlled release properties compared with the other two coatings. At the loading content of 1 wt%, the initial release rate and release duration of urea coated by polyurethane/calcined SBA-15 composite were 0.08% and 83 d, respectively. It is shown that the calcination played an important role in controlling the properties of composite coating. |
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| Keywords: | Calcination coating composite controlled release urea |
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