Starch-based coated sustained-release urea and preparation method thereof

By preparing urethane starch with microwave assistance and forming a double-layer coating on the surface of urea particles with glutaraldehyde crosslinking agent, the problems of high cost and non-degradability of existing slow-release urea materials are solved, and low-cost, green production of slow-release urea products is realized.

CN122145240APending Publication Date: 2026-06-05HENAN ACADEMY OF SCI CHEM RES INST CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HENAN ACADEMY OF SCI CHEM RES INST CO LTD
Filing Date
2026-03-12
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing slow-release urea coating materials are expensive and non-biodegradable, and the use of toxic cross-linking agents poses safety risks. Existing starch modification processes are complex and costly, making it difficult to achieve green production.

Method used

Carbamate starch was prepared by microwave-assisted method, and glutaraldehyde was used as a green crosslinking agent to react on the surface of urea particles under weakly acidic conditions to form a double-layer coating structure. The inner layer is a paraffin layer and the outer layer is a starch-based polymer layer. A stable and degradable coating is formed through chemical crosslinking.

Benefits of technology

This has enabled the development of low-cost, biodegradable, sustained-release urea products with excellent sustained-release performance and environmental friendliness, simplifying the production process and reducing energy consumption and costs.

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Abstract

The application discloses a starch-based coated slow-release urea and a preparation method thereof. The slow-release urea is composed of a core and a composite coating layer. The core is urea particles. The composite coating layer comprises a paraffin layer as an inner layer and a starch-based material layer as an outer layer. The mass of the paraffin layer accounts for 0.5-2% of the total mass of the slow-release urea. The total mass of the composite coating layer accounts for 4-10% of the total mass of the slow-release urea. The starch-based material layer is formed by cross-linking reaction of starch and / or modified starch and glutaraldehyde. The method is continuous, simple and low in cost. The coating material is biodegradable. The obtained product has good slow-release performance and moisture-proof stability. In addition, the outer layer film formed by chemical cross-linking has good mechanical strength and is combined firmly with the inner paraffin layer, so that the structural integrity of the coated urea during storage, transportation and application is ensured.
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