Coated controlled-release fertilizer for modifying urea into easily degradable film and production method of coated controlled-release fertilizer

A controlled-release fertilizer and easy-to-degrade technology, which is applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of large-scale popularization and application limitations, long degradation cycle of residual film, etc., and achieve sustainable development, fast curing, and simple operation Effect

Active Publication Date: 2014-02-05
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main raw material of this type of coating material is petrochemical products, and with the continuous depletion of petroleum resources, the price a

Method used

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  • Coated controlled-release fertilizer for modifying urea into easily degradable film and production method of coated controlled-release fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 500kg of large-grained urea with a diameter of 2-5mm into the drum and heat it to 60-90°C; then heat 3.40kg of urea to become molten liquid urea, and mix it with 0.85kg of modifier polyetheramine 400 and 4. 25 kg of curing agent p-phenylene diisocyanate is mixed evenly and sprayed on the surface of urea granules quickly. After 6-9 minutes, it can be directly cured and reacted to form a film on the surface of the fertilizer. This process is repeated 3 times. After the fertilizer is cooled, it can be packaged and stored. The obtained controlled-release fertilizer film material accounts for about 5% of the total weight of all controlled-release fertilizers, and the nutrient release period of this fertilizer in water at 25°C is about 90 days. The results of the determination of the cumulative release rate of N in water for this product are listed in Table 1.

[0023] Table 1

[0024] Release days

Embodiment 2

[0026] Put 500kg of large granular urea with a diameter of 2-5mm into the drum and heat it to 60-90°C; then heat 3.41kg of urea into molten liquid urea and mix it with 1.73kg of modifier p-phenylenediamine and 3.45 The kg curing agent toluene diisocyanate is mixed evenly and sprayed quickly on the surface of the preheated urea granules. After 6-9 minutes, it can be directly cured and reacted to form a film on the surface of the fertilizer. This process is repeated 4 times. After the fertilizer is cooled, it can be packaged and stored. The obtained controlled-release fertilizer film material accounts for about 7% of the total weight of all controlled-release fertilizers, and the nutrient release period of this fertilizer in water at 25°C is about 120 days. The N accumulation release rate determination result of this product in water is listed in Table 2.

[0027] Table 2

[0028] Release days

Embodiment 3

[0030] Put 500kg of large-grained urea with a diameter of 2-5mm into the drum and heat it to 60-90°C; then heat 3.51kg of urea into a molten liquid and mix it with 1.64kg of modifier polymethylene polyaniline Mix it with 3.35kg of curing agent diphenylmethane diisocyanate and spray it quickly on the surface of the preheated urea granules. After 6-9 minutes, it can be directly cured and reacted to form a film on the surface of the fertilizer. This process is repeated 6 times. After the fertilizer is cooled, it can be packaged and stored. The obtained controlled-release fertilizer film material accounts for about 9% of the total weight of all controlled-release fertilizers, and the nutrient release period of this fertilizer in water at 25°C is about 180 days. The N accumulation release rate measurement results of this product in water are listed in Table 3

[0031] table 3

[0032] Release days

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Abstract

The invention discloses a coated controlled-release fertilizer for modifying urea into an easily degradable film and a production method of the coated controlled-release fertilizer. The method comprises the following steps: heating common urea into a molten-state urea liquid, and uniformly mixing the molten-state urea liquid with a modifier and a curing agent; directly spraying the mixture on the surfaces of fertilizer particles for curing, reacting and forming a film, thereby obtaining a urea-modified coated controlled-release fertilizer which has smooth and dense film material surface and different water resistances. The product has excellent moisture controlled-release performance, the film material is low in cost, the film shell remained in soil is rapidly degraded, and the fertilizer belongs to the coated controlled-release fertilizer of which the film shell is easily degraded. In addition, the product is low in production cost, simple and convenient in production process flow and suitable for large-scale industrial production and popularization and application in gardening and field crops.

Description

(1) Technical field [0001] The invention relates to a coated controlled-release fertilizer modified by urea into an easily degradable film and a production method thereof, belonging to the technical field of controlled-release fertilizer production. (2) Background technology [0002] Stable and increased agricultural production is an important prerequisite for ensuring national food security. As an important means of production in modern agriculture, chemical fertilizers play an important role in agricultural production. my country is a large agricultural country, and a large amount of fertilizers are used every year. However, the low utilization rate of chemical fertilizers not only causes a huge waste of economic energy, but also brings serious environmental pollution problems. Therefore, how to greatly increase the utilization rate of fertilizers, improve the quality of agricultural products, and realize environmentally friendly development is an important problem that ne...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/08C05G3/90
Inventor 张民陆盘芳
Owner SHANDONG AGRICULTURAL UNIVERSITY
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