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Synthesis of a slow-release and superabsorbent nitrogen fertilizer and its properties

机译：缓释高吸收氮肥的合成及其性能

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摘要

A slow-release and superabsorbent nitrogen fertilizer (SSNF) was synthesized by aqueous solution copolymerization of acrylic acid and maleic anhydride using N,N'-methylene bisacrylamide as a crosslinker, ammonium persulfate and sodium sulfite as an initiator in the presence of urea. The effects on water absorbency such as amount of crosslinker, initiator, urea and maleic acid, degree of neutralization, etc. were investigated. To improve slow release and water retention properties, the product was surface-crosslinked with trihydroxymethyl propane glycidol ether (6360). The nitrogen content of the SSNF synthesized under optimal conditions was 28.5%, and the water absorbencies were about 900 (g/g) in distilled water and 180 (g/g) in tap water. The nitrogen slow release behavior of the SSNF in water and water retention capacity of the soil with SSNF were also investigated. The results showed that the surface-crosslinked product not only had good slow release property but also excellent soil moisture preservation capacity, which could effectively improve the utilization of fertilizer and water resources simultaneously. The results of the present work indicated that the SSNF could be found an application in agriculture and horticulture, especially in drought-prone areas where the availability of water is insufficient.
机译：通过N，N'-亚甲基双丙烯酰胺为交联剂，过硫酸铵和亚硫酸钠为引发剂，在尿素存在下，通过丙烯酸与马来酸酐的水溶液共聚合成缓释超吸收氮肥（SSNF）。研究了对吸水率的影响，如交联剂，引发剂，尿素和马来酸的量，中和度等。为了改善缓释和保水性能，将产物与三羟甲基丙烷缩水甘油醚（6360）表面交联。在最佳条件下合成的SSNF的氮含量为28.5％，在蒸馏水中的吸水率约为900（g / g），在自来水中的吸水率约为180（g / g）。还研究了SSNF在水中的缓释氮行为以及带有SSNF的土壤的保水能力。结果表明，该表面交联产品不仅具有良好的缓释性能，而且具有优异的土壤保水能力，可以有效提高肥料和水资源的利用率。目前工作的结果表明，SSNF可以在农业和园艺业中得到应用，特别是在水源不足的干旱地区。

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