Preparation and Properties of Kaolin Based Slow-Release Fertilizer

A slow-release fertilizer is important to improve soil conditions and enhances food security through continuous plant supply. With urea as a nitrogen source, kaolin carrier, acrylic acid reaction monomer, potassium persulfate an initiator, N, N '- methylene bisacrylamide crosslinking agent, under the action of cyclohexane sorbitan monostearate, based was synthesized by reverse suspension method for first time. The optimum polymer were 0.6 g kaolin, 2 80 ℃ temperature. maximum water absorption capacity high 219.75 g/g. retention performance lasted at least 10 days, property 28 days. release content slow stable. FTIR analysis indicated that cross-linking occurred between urea, resin meanwhile, SEM supported product had special network structure with rough porous surface. TGA confirmed stability kaolin-based fertilizer. findings fully validated synthesis feasible has potential be popular commercialized popularized in areas lacking or