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Method for preparation of coated release-controlled granular fertilizer

A technology of coated controlled-release fertilizers and granular fertilizers, which is applied in the form of fertilizers, fertilization devices, fertilizer mixtures, etc., can solve the problems of difficulty in controlling the thickness of the coating, the low efficiency of the coating, and environmental pollution, etc. High membrane efficiency, simple equipment and low energy consumption

Inactive Publication Date: 2006-12-27
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using sulfur and cementable inorganic powder as the coating control material not only has low coating efficiency, but also makes it difficult to control the thickness of the coating and the release rate of fertilizers; the use of polymer resins as materials also faces special equipment, high energy consumption and possible cause environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Styrene, acrylic acid, vinyl acetate, and 1,3-butanediol diacrylate are mixed in a material ratio of 1.0:2.0:0.5:0.3 to obtain 5 g of a mixed solution;

[0017] (2) 0.15g isobutyl ketone peroxide, 0.12g triethylamine are added in the mixed solution in (1), make film-forming liquid;

[0018] (3) Spray the film-forming solution on the surface of 100 g of compound fertilizer (12-12-12) granules at 20° C., and form a coating on the surface of the granule fertilizer after 40 minutes.

[0019] The obtained coated fertilizer film layer is uniform, stable in storage, the initial release rate in water is 12%, and the application is convenient.

Embodiment 2

[0021] (1) Mix α-methyl methacrylate, acrylonitrile, and α-butenyl methacrylate in a material ratio of 1.5:2.0:0.5 to obtain 6 g of a mixed solution;

[0022] (2) 0.10g dodecanethiol, 0.15g peracetic acid are added in the mixed solution in (1), make film-forming liquid;

[0023] (3) Spray the film-forming solution on the surface of 100 g of urea granules with an average particle diameter of 3 m at 30° C., and form a coating on the surface of the granule fertilizer after 20 minutes.

[0024] The obtained coated fertilizer has a uniform film layer, stable storage, an initial release rate of 10% in water, and convenient application.

Embodiment 3

[0026] (1) Mix hydroxyethyl acrylate, glycidyl acrylate, 1,4-butanediol diacrylate, and α-methyl methacrylate in a material ratio of 1.5:2.0:0.5:2 to obtain 4g of mixed solution;

[0027] (2) 0.10g tetramethylguanidine and 0.10g methyl ethyl ketone peroxide are added in the mixed solution in (1) to make film-forming liquid;

[0028] (3) Spray the film-forming solution on the surface of 100 g of ammonium sulfate granules with an average particle diameter of 5 mm at 10° C., and form a coating on the surface of the granule fertilizer after 8 minutes.

[0029] The obtained coated fertilizer has a uniform film layer, stable storage, an initial release rate of 18% in water, and is convenient for application.

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PUM

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Abstract

The invention discloses a preparing method of integument controlled release grain fertilizer, which comprises the following steps: blending 2-4 kinds of organic composition to form mixing solution; adding filming activist and filming accelerant to form film mixing liquid; spraying 1-20% film mixing liquid on the grain fertilizer surface evenly under -20-50 deg.c; forming integument on the surface of grain surface after 2-120 min.

Description

technical field [0001] The invention relates to the field of coated controlled-release fertilizers, in particular to a preparation method of coated controlled-release granular fertilizers. Background technique [0002] In order to improve the utilization rate of soluble chemical fertilizers and reduce the pollution of the atmosphere, soil, groundwater, rivers and lakes due to the use of chemical fertilizers, the controlled release technology of fertilizers has been actively researched and developed in recent decades. Applying the coating of chemical fertilizer granules to form coated controlled-release fertilizer is the most studied technology. It is expected to achieve the goal of achieving the goal of fertilizer production by selecting the coating material, controlling the thickness, porosity, degradation rate and particle size of the coating film, etc. The purpose of the release rate is comparable to the absorption rate of the plant. So far, due to the cost of raw materi...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/08C05G3/10C05G5/00C05G3/90
Inventor 王正辉朱伯明
Owner SOUTH CHINA AGRI UNIV
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