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| Research on Preparation and Properties of Urea-formaldehyde Fertilizer Modified byMontmorillonite |
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| DOI：10.16768/j.issn.1004-874X.2020.07.013 |
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| Abstract: |
| 【Objective】The slow and controlled release fertilizers with excellent nitrogen slow-release performance
and simple preparation process were developed.【Method】A new kind of biodegradable polymer with interlayer structure was
prepared by solution polymerization, where montmorillonite（MMT）with nanometer layer structure was interspersed with
urea-formaldehyde（UF）, a slow-release polymer fertilizer containing nutrients. The structure of the prepared fertilizer was
characterized by FTIR and XRD. The surface morphology of the fertilizer was observed by SEM. The influence of the ratio of raw
materials on molding performance of the fertilizer was studied, and the release characteristics of the fertilizer in still water was
determined.【Result】The dynamic rheological properties of the prepared slow-release fertilizer can be greatly improved with
the addition of MMT. In addition, it has an excellent sustained release effect on nitrogen, and the maximum cumulative release
rate of nitrogen is 38.79% when cultured in still water for 70 days, indicating that the slow-release properties of crystalline
polymers can be improved by destroying the original crystal structure.【Conclusion】The results have reference significance
for solving the problem of low sustained release performance caused by high crystallinity of slow-release chemical synthetic
fertilizer urea-formaldehyde, the most commonly used chemical synthetic fertilizer at present. |
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