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Resin film coated controlled-release fertilizer and preparation method

A controlled-release fertilizer and resin-coated technology, applied in the form of fertilizer, fertilizer mixture, fertilization device, etc., can solve the problems of reducing the nitrogen utilization rate of fertilizers, easy leaching of nitrate nitrogen, and increased ammonia volatilization, so as to improve the utilization rate , production cost reduction, and the effect of improving the use effect

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

[0004] 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 nitrite nitrogen and nitrate nitrogen in a short period of time. Nitrate nitrogen is easily leached in the soil, and nitrite nitrogen will also be converted into nitrogen oxides. The form is gaseous loss, resulting in a large loss of fertilizer nitrogen, thereby reducing the utilization rate of fertilizer nitrogen

Method used

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  • Resin film coated controlled-release fertilizer and preparation method

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[0029]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 After fully mixing uniformly, use a fluidized bed to spray on the surface of urea granules under the fluidized state of urea, urease inhibitor NBPT or (with) nitrification inhibitor DCD, acrylic resin and ethyl cellulose copolymer and organic The mixed solution composed of the solvent is evenly coated on the surface of the urea granules to form a smooth and uniform inhibitor coating layer to prepare the core of the slow / controlled release urea fertilizer.

[0030] Then the above-mentioned controlled-release urea fertilizer core is coated in a fluidized state, and coated with acrylic resin and ethyl cellulose copolymer, talcum powder, zeolite powder or diatomaceous earth, polyethylene glycol or phthalate...

Embodiment 1

[0033] Fertilizer composition: every 100 parts of granular urea containing 46.3% nitrogen, 0.0625 parts of urease inhibitor N-butylthiophosphate triamine (NBPT) and 2 parts of nitrification inhibitor dicyandiamide (DCD), 5 parts of acrylic resin and Ethyl cellulose copolymer, industrial ethanol solution 500ml.

[0034] Preparation method: Dissolve 5 parts of acrylic resin and ethyl cellulose copolymer into 500ml of industrial ethanol solution, then mix 0.0625 parts of NBPT and 2 parts of DCD evenly, then 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 core into fluidized bed, form copolymer with 8 parts of acrylic...

Embodiment 2

[0036] Fertilizer ingredients: every 100 parts of nitrogen-containing 46.3% granular urea, 1 part of urease inhibitor N-butyl substituted triamine phosphate (NBPT), 5 parts of acrylic resin and ethyl cellulose copolymer, 500 ml of industrial ethanol solution.

[0037] Preparation method: Dissolve 5 parts of acrylic resin and ethyl cellulose copolymer into 500ml industrial ethanol solution, then add 1 part of NBPT into it and stir 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 fluidized bed, form copolymer with 15 parts of acrylic resin and 6 parts of ethyl cellulose, 5 parts of zeolite powder inorganic conditioner, 3 part...

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Abstract

The invention relates to a controlled-release fertilizer, substantially a resin-coated controlled-release fertilizer which is prepared by coating with biochemical inhibitor on the surface of urea granules and a preparation method. The urease inhibitor or / and nitrification inhibitor is mixed with the copolymer of acrylic resin and ethyl cellulose as well as organic solvent to form the suspension; and the suspension is equably coated on the surface of the urea granules so as to make the coated urea core fertilizer; and then the surface of the coated urea core fertilizer is wrapped with crylic acid resin film. Based on making the coated inhibitor urea core fertilizer with the biochemical inhibitor in the first layer, the coating is implemented, which are processed in two steps. The most notable characteristic of the controlled-release fertilizer is that the coating is implemented on the basis of making the coated inhibitor urea core fertilizer with the biochemical inhibitor in the first layer, thereby the coating is tight, and the result on controlling biochemical inhibitor and urea release is obvious.

Description

technical field [0001] The invention relates to a controlled-release fertilizer, in particular to a resin-coated controlled-release fertilizer in which the fertilizer is coated with a biochemical inhibitor on the surface of urea granules and a preparation method thereof. Background technique [0002] Ordinary nitrogen fertilizer has a short fertilizer effect period, low fertilizer nitrogen utilization rate, and the overall utilization rate of urea nitrogen is only 35-40%. The loss of nitrogen is relatively large, and the economic benefit of nitrogen application is low, which not only causes a huge waste of resources but also increase the cost of agricultural production. Long-term application of nitrogen fertilizers produces non-point source pollution, causing greenhouse effect and eutrophication of water bodies, and deteriorating the ecological environment. In order to alleviate these problems, it is necessary to improve the performance of nitrogen fertilizers, so that nitr...

Claims

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Application Information

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IPC IPC(8): C05G3/08C05G5/00C05G3/90
CPCY02P60/21
Inventor 武志杰李东坡
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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