Release-controlled coated urea and its preparation method

A slow-release bag and urea technology, which is applied in the direction of urea compound fertilizer, nitrogen fertilizer, fertilizer mixture, etc., can solve the problems of affecting the price and popularizing the use, complex production process, and rising production cost, and achieves low cost, wide and easy availability, Energy Saving Effect

Inactive Publication Date: 2005-11-23
上海市农业科学院环境科学研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And various polymer-coated slow-release fertilizers need to dissolve the high polymer with a flux to liquefy it before entering the fluidized bed suspension coating tower to coat the nitrogen fertilizer, so there are still problems of solvent volatilization and recovery quest

Method used

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  • Release-controlled coated urea and its preparation method
  • Release-controlled coated urea and its preparation method
  • Release-controlled coated urea and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take by weighing 75% urea granules, 23% 120 mesh dolomite powder and 2% polymethylene polyphenyl polyisocyanate according to the rated volume of the sugar coating machine, and the urea granules have a diameter of 2 to 3 mm.

[0041] Put all the urea granules and about 1 / 5 (ie 0.4% of the total weight) of polymethylene polyphenyl polyisocyanate into the sugar coating machine, rotate and stir for 1 to 2 minutes to make the liquid polymethylene polyphenyl polyisocyanate After the isocyanate is uniformly adhered to the urea granules, add about 1 / 5 (ie 4.6% of the total weight) of dolomite powder, and under the rotation of the turntable of the sugar coating machine, the dolomite powder will gradually bond with the polymethylene powder adhering to the surface of the urea granules. Polyphenyl polyisocyanate ester produces a "solid-liquid" film-forming reaction to form a thin film that is tightly wrapped on the surface of urea. After more than 95% of the dolomite powder is wrapp...

Embodiment 2

[0043] According to the rated installed capacity of the sugar-coating machine, take by weighing 70% of the total weight of urea with a particle diameter of 3 to 4 mm, 26% of the uniform powder of a mixture of phosphate rock powder and zeolite (both are equal in weight) with a particle size of 100 mesh, and 4% of urea. Polymethylene polyphenyl polyisocyanate. All the urea granules and about 1 / 4 (that is, 1% of the total weight) of polymethylene polyphenyl polyisocyanate are evenly adhered to the urea granules, and about 1 / 4 (that is, 6.5% of the total weight) of the mineral mixture powder is added, In the process of machine rotation, the mineral powder and polymethylene polyphenyl polyisocyanate produce a "solid-liquid" film-forming reaction, and a thin layer is tightly wrapped on the surface of urea particles, and 95% or more of the urea to be added After the mineral powder is bonded into the coating, add about 1 / 4 of polymethylene polyphenyl polyisocyanate to coat the above c...

Embodiment 3

[0045]According to the rated installed capacity of the sugar coating machine, take 72% of the total weight of urea particles with a particle diameter of 2.5 to 4mm, 25% of the mineral powder whose particle size is a mixture of phosphate rock and medical stone equal to 100 meshes, and 3% of polysulfide Methyl polyphenyl polyisocyanate. Put all the urea granules and about 1 / 4 (that is, 0.75% of the total weight) of polymethylene polyphenyl polyisocyanate into the sugar coating machine and rotate it for about 1 to 2 minutes, until the liquid polymethylene polyphenyl polyisocyanate After evenly adhering to the surface of urea granules, add about 1 / 4 (that is, 6.25% of the total weight) of mineral powder. During the rotation of the machine, the mineral powder and polymethylene polyphenyl polyisocyanate gradually form a film to cover the surface of urea granules. , after 95% or more of the mineral powder forms a coating, add about 1 / 4 of polymethylene polyphenyl polyisocyanate for t...

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Abstract

The invention discloses a release-controlled coated urea which comprises a core layer of urea and a coated layer enclosing the surface of the urea, wherein the coated layer is formed from solid inorganic mineral powder and polymethylene polyphenyl isocyanate, the coated layer amounts to 15-30% of the total weight, its thickness is 100-120 microns.

Description

Technical field: [0001] The invention relates to fertilizers, in particular to a coated nitrogen fertilizer which forms a layer of coating on the surface of the fertilizer by solid-liquid reaction under room temperature and normal pressure conditions to slow down or control the release rate of fertilizer effect. Background technique: [0002] The fertilizers used in agricultural production in my country have changed from farm manure mainly composed of human excrement, barn manure, green manure, mud manure, and plant ash to chemical fertilizers mainly composed of nitrogen, phosphorus, and potassium. After nearly a hundred years of hard work, it has become The largest fertilizer producer in the world. However, there is still a gap with the world level in terms of variety and quality, especially in the utilization rate of chemical fertilizers. The common problem is that the utilization rate is too low, which not only directly results in the waste of resources and the increase of...

Claims

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Application Information

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IPC IPC(8): C05C9/00C05G3/90
Inventor 田吉林诸海焘
Owner 上海市农业科学院环境科学研究所
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