Acetic ester coated controlled-release urea fertilizer and preparation technique

A technology of acetate starch and controlled-release urea, which is applied in the direction of urea compound fertilizer, fertilizer mixture, nitrogen fertilizer, etc., can solve the problems of lower fertilizer nitrogen utilization rate, increase of soil pH value, easy leaching of nitrate nitrogen, etc., and achieve the goal of application The effect of improved effect, wide source and low price

Inactive Publication Date: 2008-06-18
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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Problems solved by technology

After urea is applied to the soil, it is quickly converted into ammonium nitrogen under the action of urease in the soil. A large amount of ammonium nitrogen makes the soil pH value rise rapidly and ammonia volatilization increases; Under the action of nitrification, ammonium nitrogen is converted into nitri

Method used

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  • Acetic ester coated controlled-release urea fertilizer and preparation technique

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preparation example Construction

[0032] The preparation process of controlled-release urea: using fluidized bed coating technology, adding urease or / and nitrification inhibitor corresponding to the amount of urea to the corresponding binder composed of acrylic resin, ethyl cellulose copolymer and organic solvent In the process, after fully mixing uniformly, use a fluidized bed to spray on the surface of urea granules under the state of urea fluidization, and make up urease inhibitor NBPT or / and nitrification inhibitor DCD, acrylic resin and ethyl cellulose copolymer and organic solvent The mixed solution of the mixed solution is evenly coated on the surface of urea granules to form a smooth and uniform inhibitor coating layer to obtain the core of the controlled-release urea fertilizer. It can also directly coat the large granular urea to produce coated fertilizer.

[0033] Then the above-mentioned controlled-release urea fertilizer core is coated in a fluidized state, with acetate starch and ethyl cellulose ...

Embodiment 1

[0036] For every 100 parts of granular urea containing 46.3% nitrogen, 0.0625 parts of urease inhibitor N-butylthiophosphoric triamine (NBPT) and 2 parts of nitrification inhibitor dicyandiamide (DCD), 5 parts of acrylic resin and ethyl Cellulose copolymer, industrial ethanol solution 500ml. Dissolve the corresponding amount of acrylic resin and ethyl cellulose copolymer into industrial ethanol solution, and then mix the corresponding amount of urease inhibitor N-butylthiophosphate triamine (NBPT) and nitrification inhibitor dicyandiamide (DCD) After uniformity, add it and stir evenly to form a mixed suspension solution. The mixed suspension solution was coated with fluidized urea particles in a fluidized bed. The operating parameters of the fluidized bed were 60° C. of air inlet temperature, 0.35 Pa of compressed air pressure, and 0.05 Pa of nozzle atomization pressure to prepare urea fertilizer cores containing 43.2% nitrogen. Then put every 100 parts of urea fertilizer cor...

Embodiment 2

[0038] For every 100 parts of nitrogen-containing 46.3% granular urea, 1 part of urease inhibitor N-butylthiophosphoric triamine (NBPT), 5 parts of acrylic resin and ethyl cellulose copolymer, and 500 ml of industrial ethanol solution. A corresponding amount of acrylic resin and ethyl cellulose copolymer is dissolved in industrial ethanol solution, and then a corresponding amount of urease inhibitor N-butylthiophosphoric triamine (NBPT) is added therein and stirred evenly to form a mixed suspension solution. The mixed suspension solution is coated with fluidized urea particles in a fluidized bed. The operating parameters of the fluidized bed are as follows: inlet air temperature 60°C, compressed air pressure 0.35Pa, nozzle atomization pressure 0.05Pa. A urea fertilizer core containing 43.6% nitrogen was prepared. Then put every 100 parts of urea fertilizer core into the fluidized bed, use 20 parts of acetate starch and 10 parts of ethyl cellulose to form a copolymer, 1 part of...

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Abstract

The invention relates to a coated urea fertilizer, substantially an acetate starch-coated controlled-release urea fertilizer which is prepared by utilizing high-substitute degree acetate starch and a preparation process. The urea is implemented on coating by the coating material which is made by utilizing high-substitute degree acetate starch and other ingredients, so that the acetate starch-coated controlled-release urea fertilizer is generated; the coated urea can be ordinary bulky grain urea or the bulky grain urea with biochemical inhibitor on the surface; the biochemical inhibitor is urease inhibitor or/and nitrification inhibitor, thereby the acetate starch-coated controlled-release urea fertilizer is made. The most notable characteristic of the acetate starch-coated controlled-release urea fertilizer is that: the coating is implemented by utilizing the coating material high-substitute degree acetate starch which can be biodegraded fully, the soil environmental will not be polluted after being fertilized on by the coated urea fertilizer, thereby the coated urea fertilizer is a real green environment-friendly coated fertilizer. And the source of coated material is board and is easy to be obtained, and the price is lower, so the production cost of the coated urea fertilizer can be reduced greatly.

Description

technical field [0001] The invention relates to a coated urea fertilizer and its preparation, in particular to preparing the acetate starch coated controlled-release urea fertilizer and its preparation process by using acetate starch with a high degree of substitution. Background technique [0002] Urea is a cheap high-nitrogen chemical fertilizer. my country's current annual production capacity of urea is 40 to 45 million tons, while the annual agricultural production and consumption is 40 million tons. However, the overall utilization rate of urea nitrogen is only 35 to 40%, far from developed countries. There is a large gap between 50% and 60% of the national utilization rate, more nitrogen loss, and lower economic benefits of nitrogen application, which not only causes a huge waste of resources but also increases the cost of agricultural production. Long-term application of nitrogen fertilizers produces non-point source pollution, causing greenhouse effect and eutrophicat...

Claims

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Application Information

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IPC IPC(8): C05G3/08C05C9/00C05G3/90
CPCY02P60/21
Inventor 李东坡武志杰
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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