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

摘要

The invention provides a water soluble polymer coating agent, a coated controlled-release fertilizer containing such coating agent and preparation method thereof. The water soluble polymer coating agent is characterized in containing preformed polymer of alkyd resin in the form of neutralization. The coated controlled release fertilizer is composed of fertilizer core and film outside the fertilizer core, in which such film comprises the polymer membrane containing the water soluble polymer coating agent and optional inorganic layer containing inorganic powders outside the polymer membrane.