EMULSION POLYMER COATING AGENT, COATED CONTROLLED-RELEASE FERTILIZER AND PREPARATION THEREOF

摘要

The invention is related to an emulsion polymer coating agent, a coated controlled-release fertilizer including the coating agent and preparation method thereof. The emulsion polymer coating agent characterizes in that the coating agent includes prepolymer of alkyd resin in the form of neutralization. The invention is further related to a controlled-release fertilizer, which is composed of fertilizer core and film outside the fertilizer core. And the film includes the polymer coat containing the emulsion polymer coating agent and selectively inorganic layer containing inorganic powder outside the polymer coat.