Abstract
The manuscript represents epoxidation of linseed oil to be coated on urea granules for their control release. Linseed oil was epoxidized in the presence of acetic acid and hydrogen peroxide. Structural transformation of unsaturated oil to epoxy group was confirmed by FTIR and end group analysis. Thereafter, the epoxidized linseed oil (ELO) was coated on the surface of urea granules and crosslinked subsequently using triethylenetetramine (TETA) a renewable substrate. Coated urea as an essential release component was first characterized for coating using optical microscope and SEM images. The control release behaviour of the prepared coated urea fertilizer was studied using dissolution and release urea from the crosslinked structure. The results demonstrated fast dissolution of pristine urea that is responsible for unwanted losses, toxicity, and harmfulness to environment, while coated with ELO and crosslinked with TETA required more time as necessary for slow and control release. The results demonstrated epoxidized oil as a green solution to coat urea granules for its control release.
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