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A kind of preparation method of controlled-release fertilizer for aquatic crops

A technology for aquatic crops and controlled-release fertilizers, applied in the direction of fertilizers made from biological waste, application, potash fertilizers, etc., can solve the problems of interrupted coating speed, shortened production time, and restricted use, so as to reduce the frequency of fertilization and improve Fertilizer use efficiency, effect of promoting rapid growth

Active Publication Date: 2019-11-08
GUIYANG KAILIN FERTILIZER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For example, the patent application number is CN201410065836.X, which discloses a solvent-free coated controlled-release fertilizer and its preparation method. The coating material is formed by polymerizing phthalic anhydride polyester diol, isocyanate and microcrystalline paraffin, and is passed through a double-nozzle coating machine successively. Spray on the surface of the granules separately, repeat three times and three times to make slow and controlled release fertilizers. Through the improvement of equipment and optimization of spraying, the invention limits the number of coating times and shortens the production time, and solves the problem of clogging and interrupting the coating caused by sharing a nozzle. problems and the problems of coating speed and coating uniformity, as well as increasing the output per unit time; but the phthalic anhydride polyester polyol is not only expensive, but also has problems such as poor degradation, which restricts its use in farmland

Method used

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  • A kind of preparation method of controlled-release fertilizer for aquatic crops
  • A kind of preparation method of controlled-release fertilizer for aquatic crops

Examples

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Effect test

Embodiment 1

[0030] A method for preparing a controlled-release fertilizer for aquatic crops, comprising the following steps:

[0031] (1) Blend nitrogen, phosphorus and potassium fertilizers with alginate aqueous solution at a mass ratio of 1:0.5, and add polylactic acid accounting for 10% of the mass of the alginate aqueous solution, starch accounting for 40% of the mass of the alginate aqueous solution, and Stir and mix polyurethane with 30% mass of alginate aqueous solution to obtain a mixture; add a solvent to make a coated slurry;

[0032] (2) Aquatic crop fertilizer is placed in granulator to granulate, obtains granular fertilizer; Granular fertilizer is placed in coating machine, accounts for the coated slurry of 1% of granular fertilizer quality according to spraying each time, sprays and wraps granular fertilizer, And rush into the hot air with a temperature of 50°C, keep the constant temperature in the coating machine for 3 minutes, and then spray the coating slurry for the seco...

Embodiment 2

[0041] A method for preparing a controlled-release fertilizer for aquatic crops, comprising the following steps:

[0042](1) Blend nitrogen, phosphorus and potassium fertilizers with alginate aqueous solution at a mass ratio of 3:2, and add polylactic acid accounting for 30% of the mass of the alginate aqueous solution, starch accounting for 60% of the mass of the alginate aqueous solution, and The polyurethane with 70% quality of alginate aqueous solution is stirred and mixed evenly to obtain a mixture; a solvent is added to make a coated slurry;

[0043] (2) Aquatic crop fertilizer is placed in granulator to granulate, obtains granular fertilizer; Granular fertilizer is placed in coating machine, accounts for the coated slurry of 2% of granular fertilizer quality according to spraying each time, sprays and wraps granular fertilizer, And rush into the hot air with a temperature of 70°C, keep the constant temperature in the coating machine for 5 minutes, and then spray the coa...

Embodiment 3

[0051] A method for preparing a controlled-release fertilizer for aquatic crops, comprising the following steps:

[0052] (1) Nitrogen, phosphorus and potassium fertilizers are blended with the alginate aqueous solution at a mass ratio of 2:1.5, and polylactic acid accounting for 20% of the mass of the alginate aqueous solution, starch accounting for 50% of the mass of the alginate aqueous solution, and The polyurethane with 50% quality of alginate aqueous solution is stirred and mixed evenly to obtain a mixture; a solvent is added to make a coated slurry;

[0053] (2) Aquatic crop fertilizer is placed in granulator to granulate, obtains granular fertilizer; Granular fertilizer is placed in coating machine, accounts for the coating slurry of 1.5% of granular fertilizer quality according to spraying each time, sprays and wraps granular fertilizer, And rush into the hot air with a temperature of 60°C, keep the constant temperature in the coating machine for 4 minutes, and then s...

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Abstract

The invention relates to the technical field of controlled release fertilizer for aquatic crops, and in particular, relates to a preparation method of a controlled release fertilizer for aquatic crops; a film-coating slurry is prepared from a nitrogen-phosphorus-potassium fertilizer, an alginate aqueous solution, polylactic acid, starch, polyurethane and a solvent, then is combined with an aquatic crop fertilizer and is granulated, and film coating treatment is performed; the prepared controlled release fertilizer for the aquatic crops has the controlled release period prolonged, and a formed film coating layer is dense and firm and is not easy to damage; and the method has the advantages of simple manufacturing process, low cost, and easily obtained raw materials.

Description

technical field [0001] The invention relates to the technical field of controlled-release fertilizers for aquatic crops, in particular to a preparation method for controlled-release fertilizers for aquatic crops. Background technique [0002] my country is a country that uses a large amount of fertilizers. Agriculture and animal husbandry are inseparable from fertilizers. However, traditional fertilizers have low utilization rates and high pollution. Soil salinization and water pollution are closely related to the abuse of fertilizers. Different regions and different crops require different chemical fertilizers, so it is necessary to "customize" fertilizers for crops according to different soils and crops. However, as far as China is concerned, the production cost of such fertilizers is very high, and reprocessing may cause Secondary pollution, so the emergence of slow and controlled release fertilizers has improved the utilization rate of fertilizers, which is conducive to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C05G3/08C05G3/90
CPCC05B1/02C05B7/00C05G3/00C05G3/90C05G5/30C05B17/00C05C1/00C05D1/00C05D9/02C05F11/00C05D3/00C05F5/002C05C9/00C05D1/02
Inventor 韩朝应彭宝林张伟周勇蒲勇郑超蒋学华
Owner GUIYANG KAILIN FERTILIZER CO LTD
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