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method for forming an encapsulated fertilizer, and encapsulated fertilizer
method for forming an encapsulated fertilizer, and encapsulated fertilizer
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机译：胶囊化肥料的形成方法及胶囊化肥料
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摘要
One method for forming an encapsulated fertilizer comprises the step of providing a core particle. the core particle comprises a fertilizer and has an outer surface. An example of fertilizer is urea. The method further comprises the step of applying an isocyanate component directly to the outer surface of the core particle. The isocyanate component has isocyanate functional groups. An example of the isocyanate component is an isocyanate-terminated polymer. A specific example of the isocyanate-terminated polymer is one comprising the reaction product of a diphenylmethane diisocyanate (mdi) and a polyol. The method further comprises the step of reacting the isocyanate component with ambient moisture to form a layer arranged around the core particle to form the encapsulated fertilizer. the layer comprises polyurea bonds. the layer may further comprise polyurethane bonds. for example, the layer may be in the form of a polyurea / polyurethane layer when the isocyanate-terminated polymer is used.
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