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Efficient coated control release urea and preparation thereof

A controlled-release urea and coating technology, which is applied in the direction of urea compound fertilizer, nitrogen fertilizer, fertilizer mixture, etc., can solve the problems of high cost and limited cost, and achieve the effects of simple manufacturing process, stable release rate and low production cost

Inactive Publication Date: 2009-08-12
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the key to the development of controlled-release fertilizers is to find controlled-release materials with low price and good performance. Although there are controlled-release fertilizers with good controlled-release effects at home and abroad, their application, especially in agricultural production, is still very limited. The main reason is that they cost too much

Method used

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  • Efficient coated control release urea and preparation thereof
  • Efficient coated control release urea and preparation thereof
  • Efficient coated control release urea and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Weigh 2.000Kg of urea and place it in a 50L electrothermal reaction kettle, wet the surface with 100ml of distilled water, raise the temperature to 105°C, and make the urea in a molten state; put in 1.000Kg of zeolite powder, keep warm and stir for 30min, and obtain zeolite after cooling and solidifying coated urea.

[0026] (2) Weigh 3.0Kg of carboxymethyl cellulose (CM32) and mix it with 30L of distilled water, stir to dissolve and heat to 100°C to melt it, and transfer the solution into a watering can while it is still hot. Spray 3L of the above-mentioned carboxymethylcellulose solution on the surface of the zeolite-coated urea obtained in step (1) with a watering can, stir at the same time, and coat; then place the product at 100°C for 2 hours and keep stirring during the heat preservation process . Cool to room temperature to obtain a powder product. The particle diameter range of the product is 1-6um.

Embodiment 2

[0028] (1) Weigh 2.000Kg of urea and place it in a 50L electrothermal reaction kettle, wet the surface with 100ml of distilled water, raise the temperature to 100°C, and make the urea in a molten state; put in 2.000Kg of zeolite powder, keep warm and stir for 30min, and obtain zeolite after cooling and solidifying coated urea.

[0029] (2) Weigh 4.0Kg of carboxymethyl cellulose (CM32) and mix it with 30L of distilled water, stir to dissolve and heat to 100°C to melt it, and transfer the solution into a watering can while it is still hot. Spray 1L of carboxymethylcellulose solution on the surface of the zeolite-coated urea obtained in step (1) with a watering can, and stir at the same time for coating; then place the product at 100° C. for 2 hours and keep stirring during the heat preservation process. Cool to room temperature to obtain a powder product. The particle diameter range of the product is 1-6um.

Embodiment 3

[0031] (1) Weigh 2.000Kg of urea and place it in an electric heating reaction kettle, wet the surface with 100ml of distilled water, raise the temperature to 110°C, and make the urea in a molten state. Put in 0.500Kg zeolite powder, keep warm and stir for 30min. After cooling to room temperature, zeolite-coated urea was obtained after solidification.

[0032] (2) Weigh again 4.0Kg carboxymethyl cellulose (CM32) and mix it with 30L distilled water, stir to dissolve and heat to 100°C to melt it. The carboxymethyl cellulose solution is sprayed on the surface of the zeolite-coated urea obtained in step (1), and stirred at the same time for coating; then the product is kept and dried at 90° C. for 5 hours, and continuously stirred during the heat preservation process. Cool to room temperature to obtain a powder product. The particle diameter range of the product is 1-6um.

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Abstract

The invention relates to the field of fertilizer and discloses a high-efficiency film-coated controlled release urea which has the structure comprising an internal layer, an intermediate layer and an external layer, wherein, the internal layer is urea, the intermediate layer is inorganic cladding material and the external layer is organic matter coating material; the weight ratio of the urea, the inorganic cladding material and the organic matter coating material is 1:(0.2-1): (0.02-0.2). The high-efficiency film-coated controlled release urea has stable nitrogen release speed and reduced nitrogen loss speed, so as to not only greatly improve the utilization rate of fertilizer, but also relieve or eliminate the fertilizer pollution, thus being an environment-friendly slow release fertilizer. The invention also discloses a method for preparing the high-efficiency film-coated controlled release urea.

Description

technical field [0001] The invention belongs to the technical field of chemical fertilizers, and relates to an environment-friendly controlled-release fertilizer capable of controlling the slow release of urea, in particular to a high-efficiency coated controlled-release urea and a preparation method thereof. Background technique [0002] As a kind of nitrogen fertilizer with the highest nitrogen content and the largest amount of use, urea plays a pivotal role in the industrial and agricultural production of various countries. However, the seasonal utilization rate of my country's farmland chemical fertilizers is only 30% to 35% for nitrogen fertilizer, 10% to 20% for phosphorus fertilizer, and 35% to 50% for potassium fertilizer. Taking nitrogen fertilizer as an example, the annual loss of nitrogen is equivalent to more than 19 million tons of urea, equivalent to more than 38 billion yuan. [0003] This high-consumption and low-efficiency chemical fertilizer not only leads...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/08C05C9/00C05G3/90
CPCY02P60/21
Inventor 余锡宾浦旭鑫杨绪勇
Owner SHANGHAI NORMAL UNIVERSITY
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