INTEGRATED-PREPARATION AND APPLICATION METHODS OF UREA-FORMALDEHYDE (UF)-BASED MULTI-NUTRIENT BIODEGRADABLE POLYMERIC SLOW-RELEASE (SR) LIQUID AND GRANULAR FERTILIZERS

Abstract: a method for integrally preparing urea-formaldehyde (uf)-based multi-nutrient biodegradable polymeric slow-release (sr) liquid and granular fertilizers is provided. a hydroxymethylurea solution is prepared, and a part of the hydroxymethylurea solution is added to a reactor for reaction to obtain the uf-based multi-nutrient biodegradable polymeric sr liquid fertilizer. the rest of the hydroxymethylurea solution is fed into a reaction-extrusion integrated machine for reactive extrusion to obtain a uf polymer through the polycondensation reaction, which is extruded, dried and granulated to obtain the uf-based multi-nutrient biodegradable polymeric sr granular fertilizer. a method for applying such liquid and granular fertilizers is also provided.

Inventor(s): Yaqing LIU, Yang XIANG, Wenqi WANG, Guizhe ZHAO

CPC Classification: C05C9/02 (NITROGENOUS FERTILISERS)

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