Synthesis and performance of polyurethane coated urea as slow/controlled release fertilizer

Qingshan Li; Shu Wu; Tiejun Ru; Limin Wang; Guangzhong Xing; Jinming Wang

doi:10.1007/s11595-012-0421-7

Journal of Wuhan University of Technology Materials Science Edition ›› 2012, Vol. 27 ›› Issue (1) : 126 -129. DOI: 10.1007/s11595-012-0421-7

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Synthesis and performance of polyurethane coated urea as slow/controlled release fertilizer

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Abstract

Polyurethane coated urea slow/controlled release fertilizer was prepared based on urea granules, isocyanate, polyols and paraffin. Isocyanate reacted with polyols to synthesize the polyurethane skin layer on urea granules surface. Paraffin serves as a lubricant during syntheses of polyurethane skin layers. The structure and nutrient release characteristics of the polyurethane skin layers were investigated by FTIR, SEM and TG. Urea nitrogen slow-release behavior of the polyurethane coated urea was tested. The experimental results indicated that compact and dense polyurethane skin layers with a thickness of 10–15 μm were formed on urea surface, the urea nitrogen slow-release time can reach 40–50 days. Paraffin proves to play a key role in inhibiting water to penetrate into urea, but excessive addition would decrease the polyurethane crosslinking density.

Keywords

polyurethane elastomer / coated urea / slow / controlled release fertilizer / paraffin

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Qingshan Li, Shu Wu, Tiejun Ru, Limin Wang, Guangzhong Xing, Jinming Wang. Synthesis and performance of polyurethane coated urea as slow/controlled release fertilizer. Journal of Wuhan University of Technology Materials Science Edition, 2012, 27(1): 126-129 DOI:10.1007/s11595-012-0421-7

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