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Solvent-free film-coating controlled-release fertilizer and preparation method thereof

A controlled-release fertilizer and solvent-free technology, applied in the direction of fertilizer forms, fertilizer mixtures, nitrogen fertilizers, etc., can solve the problems of uneven distribution of coating liquid, achieve the effects of shortening coating time, ensuring controlled-release performance, and increasing yield

Active Publication Date: 2014-05-28
BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a solvent-free coated controlled-release fertilizer and its preparation method. The present invention mainly sprays the coating solution on the moving particles in proportion to obtain the fertilizer described in the present invention through a double nozzle process and equipment. The controlled-release fertilizer, the invention solves the problem of uneven distribution of the coating liquid on the particles during the solvent-free coating process

Method used

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  • Solvent-free film-coating controlled-release fertilizer and preparation method thereof
  • Solvent-free film-coating controlled-release fertilizer and preparation method thereof
  • Solvent-free film-coating controlled-release fertilizer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1, preparation coated controlled-release fertilizer

[0063] The formula table of this embodiment is shown in Table 1.

[0064] Table 1 Coating polymer formula table

[0065]

[0066] (1) Weigh 3kg of 2-3mm large grain urea for later use. Weigh 31.2 grams of diphenylmethane polyisocyanate (PAPI, Bayer company), put it in the heating liquid reservoir I8 and raise the temperature to 75 ° C, drop in 0.11 g of surfactant, stir well and keep warm at 75 ° C; at the same time, weigh the polyester Put 33.8g of polyol in another heating reservoir Ⅱ3, weigh 3.15g of microcrystalline paraffin wax (melting point 70°C, commercially available), put it into the heating reservoir Ⅱ3 and raise the temperature to 85°C, keep warm and stir, The microcrystalline paraffin wax is evenly dispersed in the polyol solution, and finally 0.6 g of the catalyst is added dropwise and continued to stir evenly.

[0067] (2) While the temperature of the two solutions is rising, continue ...

Embodiment 2

[0073] Embodiment 2, preparation coated controlled-release fertilizer

[0074] The formula table of this embodiment is shown in Table 2.

[0075] Table 2 Coating polymer formula table

[0076]

[0077](1) Weigh 3kg of 3-4mm large grain urea for use. Weigh 30.9 grams of polyisocyanate (PAPI, Bayer company), place it in the heating reservoir I8 and raise the temperature to 80°C, drop in 0.12g of surfactant, stir evenly and keep warm at 80°C; at the same time, weigh 34.8g of polyester polyol , put it in the heating reservoir Ⅱ3, weigh 3.81g of microcrystalline paraffin wax (melting point 75°C, commercially available), put it into the heating reservoir Ⅱ3 and raise the temperature to 95°C, keep warm and stir to make the microcrystalline paraffin evenly Disperse in the polyol solution, and finally add 0.45 g of the catalyst dropwise and continue to stir evenly.

[0078] (2) While the temperature of the two solutions is rising, continue to prepare the coating solution for the ...

Embodiment 3

[0082] Embodiment 3, preparation coated controlled-release fertilizer

[0083] The formula table of this embodiment is shown in Table 3.

[0084] Table 3 Coating polymer formula table

[0085]

[0086] (1) Weigh 2~3mm compound fertilizer (N:P 2 o 5 :K 2 O=15:15:15, mass ratio) 5kg spare. The first spraying solution is 40.0g of PAPI, 0.2g of surfactant is added to the heating reservoir Ⅰ8, stirred and heated to 85°C, 60.8g of polyol, 4.67g of microcrystalline paraffin wax 70# (melting point 70°C) and 0.67g of catalyst , added to the heating reservoir II3, stirred and heated to 90 ° C for later use. According to the formula shown in Table 3, add the 2 materials required for secondary spraying into the heating reservoir I8, stir and heat to 80°C, add the corresponding 3 materials in Table 3 into the heating reservoir II3, stir and heat to 90°C, according to the above method, weigh the materials required for the third time in Table 3 and add them to the corresponding heat...

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Abstract

The invention discloses a solvent-free film-coating controlled-release fertilizer and a preparation method thereof. The film-coating controlled-release fertilizer comprises fertilizer particles and a coating layer coating the fertilizer particles; the mass percentage content of the fertilizer particles is 93%-97%, and the mass percentage content of the coating layer is 3%-7%; the coating layer is obtained by polymerization of polyisocyanate, polyester polyol and microcrystalline paraffin. According to the preparation method provided by the invention, 2 kinds of polymers are respectively sprayed on the particle surface one after another, the problem that coating is interrupted due to blocking caused because one pipeline and one nozzle are each used in common is solved, at the same time, the probability of particle adhesion occurring in a device is significantly reduced, and thus the stability of the film coating process is obviously enhanced. The problem that the film coating speed and the film coating uniformity cannot be taken into account is solved, and uniform distribution of a film layer during a rapid film forming process is achieved.

Description

technical field [0001] The invention relates to a solvent-free coated controlled-release fertilizer and a preparation method thereof. Background technique [0002] Under the pressure of dwindling cultivated land and growing urban population, the application of chemical fertilizers will still be an important measure for the stable and sustainable development of my country's agriculture for a long time to come. However, with the increase of fertilizer application, there has been a situation where the amount of chemical fertilizer has increased significantly but the yield per unit area of ​​crops has remained stagnant. At the same time, a large amount of nitrogen and phosphorus loss has caused serious environmental pollution and other problems. These have become one of the fundamental issues restricting my country's food security and environmental security. For this reason, the Central Document No. 1 has promoted slow and controlled release fertilizers as an important force in...

Claims

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Application Information

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IPC IPC(8): C05G5/00C05C9/00C05G1/00
Inventor 杨俊刚刘宝存徐秋明郝赟李鸿雁邹国元孙焱新
Owner BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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