Urea-containing slow-release coated fertilizer and preparation method thereof

Through the bioenzyme polyurethane coating technology, the use of castor oil-based polyester polyol and hydrophobically modified starch, the problems of poor degradability, uncontrollable release and insufficient weather resistance of urea-coated fertilizer are solved, and the efficient and environmentally friendly urea sustained release effect is achieved, which is suitable for modern agriculture.

CN120574099AInactive Publication Date: 2025-09-02SHANDONG QISHANG CENTURY BIOTECHNOLOGY CO LTD
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Patent Information

Application Number
CN202510771289.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-10
Publication Date
2025-09-02
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The existing urea-coated fertilizers have problems such as poor degradability, uncontrollable release, low nitrogen content and insufficient weather resistance, which is difficult to meet the functional needs of modern agriculture for smart fertilizers.

Method used

The bioenzyme polyurethane envelope technology is adopted to form a coating layer through the precise ratio and reaction design of components such as castor oil, castor oil-based polyester polyol, hydrophobically modified starch and high-temperature resistant biological enzymes, which regulates the release period and degradability of urea, and improves mechanical strength and environmental friendliness.

Benefits of technology

It has achieved high nitrogen content, controlled release period, and environmentally friendly sustained release effects of urea. It is suitable for agricultural planting and landscaping, with a degradation rate of up to 90%, excellent rainwater erosion resistance, improved nitrogen utilization rate, and can be adjusted for 30-120 days.

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Abstract

The invention relates to the technical field of fertilizers, in particular to a urea-containing slow-release coated fertilizer and a preparation method thereof. The urea-containing slow-release coated fertilizer comprises urea particles and a bio-enzyme polyurethane coating layer coated on the surfaces of the urea particles, and the bio-enzyme polyurethane coating layer comprises the following components in parts by mass: 10-20 parts of urea particles, 10-20 parts of urea particles and 10-20 parts of urea particles. Comprising the following raw materials: 20 to 25 parts of castor oil, 18 to 25 parts of castor oil-based polyester polyol, 25 to 30 parts of hydrophobic modified starch, 16 to 22 parts of diphenylmethane diisocyanate, 0.03 to 0.05 part of a catalyst, 1.5 to 2 parts of a dispersant, 1.5 to 2 parts of a high-temperature-resistant bio-enzyme, 2 to 3 parts of glycerin and 14 to 18 parts of N, N-dimethylformamide. The polyurethane coating layer material of the bio-enzyme is prepared through the cross-linked network design of the molecular level and the collaborative regulation and control of the macroscopic coating layer thickness, the balance among efficient nitrogen utilization, environmental friendliness, mechanical properties and weather resistance is achieved, and a solution with technical innovation and practical value is provided for the field of slow-release fertilizers.
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