Oil-based coatings for controlled nutrient release
https://doi.org/10.21285/achb.1008
EDN: AOCZMT
Abstract
Encapsulation of mineral fertilizers is one of the most effective ways to reduce nutrient losses. In order to obtain protective coatings on the surface of fertilizer granules, a wide range of natural and synthetic polymers is used. The main disadvantage of synthetic polymers lies in their accumulation in soil due to their inability to biodegrade. One way to ensure biodegradability is to use vegetable oil polymers as coating materials. The present study used linseed and tung oils, which were applied to the moving layer of granules in a pan granulator by means of a pneumatic atomizer. The protective coating was formed through the polymerization of oil directly on the particle surface. The process was accelerated via hot-air heating and the addition of a manganese drier to the oil. As a result, encapsulated carbamide samples with 7% and 10% coating contents were obtained. The study analyzed the kinetics of carbamide release from the obtained capsules in aqueous medium under static conditions. For both types of oil, the release curves are S-shaped. The duration of encapsulated fertilizer effect increases at a greater coating mass fraction and, therefore, capsule thickness. A comparative analysis showed that the barrier properties of tung oil-based coatings are significantly better than those of linseed oil-based coatings. At a capsule mass fraction of 10%, it takes 14 days for 80% of carbamide to be released in the case of linseed oil and 56 days in the case of tung oil, i.e., four times longer.
About the Authors
A. G. Lipin
Ivanovo State University of Chemistry and Technology
Russian Federation
Russian Federation
Aleksandr G. Lipin, Dr. Sci. (Engineering), Professor
7, Sheremetevskiy Ave., Ivanovo, 153000
A. A. Lipin
Ivanovo State University of Chemistry and Technology
Russian Federation
Russian Federation
Andrey A. Lipin, Dr. Sci. (Engineering), Associate Professor, Head of the Department
7, Sheremetevskiy Ave., Ivanovo, 153000
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Review
For citations:
Lipin A.G., Lipin A.A. Oil-based coatings for controlled nutrient release. Proceedings of Universities. Applied Chemistry and Biotechnology. 2025;15(4):582-589. (In Russ.) https://doi.org/10.21285/achb.1008. EDN: AOCZMT
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