Waterborne acrylic emulsions modified with organic siloxanes and aziridine crosslinker were synthesized and applied as coating of controlled release fertilizer. The free films were characterized and the nutrient release profiles of the coated fertilizers were determined. The results show that methyl silicone oil and methylsilanolate sodiumcould not improve water resistance performance and glass transition temperature T
g
of coatings
while the firmness is enhanced. Aziridine crosslinker improves the water resistance performance
firmness and T
g
. Incorporation of methyl silicone oil and aziridine crosslinker gives an excellent aqueous acrylic emulsion for coated controlled release fertilizer
with the 30-day cumulative nutrient release reduced to 16% and an estimated nutrient release duration over 190 days. Therefore
this waterborne coating is promising to meet the requirements for controlled release of nutrient and environmental protection.
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