A controlled release fertilizer, a preparation method thereof and applications thereof

A slow-release fertilizer, fertilizer technology, applied in the direction of application, fertilizer mixture, fertilization device

Active Publication Date: 2013-11-13
山东鲁虹智慧农业研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010]The methods listed above all have the problem that the mass of the coating material is relatively large. Although the coating structure plays a certain slow-release effect on the main nutrients of the fertilizer core, the However, the total nutrient content is significantly reduced, and it is difficult to apply in the production of high-content formula fertilizers by blending; in some of the technologies listed above, the coating material contains resin and other refractory materials, and long-term use has potential pollution to the soil

Method used

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  • A controlled release fertilizer, a preparation method thereof and applications thereof
  • A controlled release fertilizer, a preparation method thereof and applications thereof
  • A controlled release fertilizer, a preparation method thereof and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The main raw materials include: urea, gelatin, ferrous sulfate, zinc sulfate, manganese sulfate, boric acid, ammonium citrate, formaldehyde, polyvinyl alcohol and water;

[0046] The main special equipment includes: reaction kettle, drum coating machine, dryer.

[0047] The production process consists of three steps:

[0048] The first step, the preparation of the encapsulation material, calculated on the basis of 100 kg per production, 1. Add 15 kg of water, 2 kg of gelatin, and 1.5 kg of polyvinyl alcohol to the reactor A in sequence, stir and heat up to 60-70°C, Then add 10 kg of urea, 0.5 kg of formaldehyde, and continue to stir for 30 minutes; 2. Add 31.5 kg of water, 20 kg of ferrous sulfate, 5 kg of zinc sulfate, 1 kg of manganese sulfate, 1 kg of boric acid, and citric acid in the reactor B. 2.5 kg of ammonium and 10 kg of urea, stirred and heated to 50-60°C; 3. Pour the liquid in the reactor B into the reactor A, and keep stirring for 2 hours to make an encaps...

Embodiment 2

[0051] The main raw materials include: urea, gelatin, ferrous sulfate, zinc sulfate, manganese sulfate, boric acid, ammonium citrate, formaldehyde, polyvinyl alcohol and water;

[0052] The main special equipment includes: reaction kettle, drum coating machine, dryer.

[0053] The production process consists of three steps:

[0054] The first step is the preparation of encapsulation materials, calculated on the basis of 100 kg per production. 1. Add 20 kg of water, 3 kg of gelatin, and 2 kg of polyvinyl alcohol in sequence in reaction kettle A, stir and heat up to 60-70°C, then add 10 kg of urea, 0.5 kg of formaldehyde, and continue stirring for 30 minutes; 2. Add 25 kg of water, 15 kg of ferrous sulfate, 10 kg of zinc sulfate, 1 kg of manganese sulfate, 1 kg of boric acid, 2.5 kg of ammonium citrate, and 10 kg of urea into reaction kettle B, stir and heat to 50-60°C; 3. Pour the liquid in the reactor B into the reactor A and keep stirring for 2 hours to make an encapsulatio...

Embodiment 3

[0057] The main raw materials include: urea, gelatin, ferrous sulfate, zinc sulfate, manganese sulfate, boric acid, ammonium citrate, formaldehyde, polyvinyl alcohol and water;

[0058] The main special equipment includes: reaction kettle, drum coating machine, dryer.

[0059] The production process consists of three steps:

[0060] The first step is the preparation of encapsulation materials, calculated on the basis of 100 kg per production. 1. Add 20 kg of water, 5 kg of gelatin, and 2 kg of polyvinyl alcohol in sequence in reactor A, stir and heat up to 60-70°C, then add 10 kg of urea and 1 kg of formaldehyde, and continue stirring for 30 minutes; 2. Add 21 kg of water, 20 kg of ferrous sulfate, 5 kg of zinc sulfate, 2 kg of manganese sulfate, 1.5 kg of boric acid, 2.5 kg of ammonium citrate, and 10 kg of urea into reaction kettle B, stir and heat to 50-60°C; 3. Pour the liquid in the reactor B into the reactor A and keep stirring for 2 hours to make an encapsulation mate...

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Abstract

The invention belongs to the fertilizer field, particularly relates to a controlled release fertilizer, and further relates to a preparation method of the fertilizer and applications of the fertilizer. According to the invention, salts such as ferrous sulfate, etc. and a complexing agent are added into a gelatin solution that adopts formaldehyde as a cross-linking agent, thus preparing a composite colloidal solution containing chelated ferric salts. The composite colloidal solution is used to be coated on surfaces of fertilizer core (urea) particles, and heated to be dried and solidified to generate an envelope layer containing ureido complexing ferric salts. When the fertilizer is immersed in still water, the envelope layer absorbs water and swells to be a cystic structure, and therefore the fertilizer is called cyst urea and is a controlled release fertilizer. The controlled release period can be prolonged by repeating the above coating process. The controlled release fertilizer overcomes defects that traditional controlled release coating fertilizers contain degradation-resistant materials such as resin, etc., and reduces potential pollution to soil. The fertilizer provided by the invention has ecological safety, small usage amount, good film-forming property and good controlled release effects.

Description

technical field [0001] The invention belongs to the field of fertilizers, and in particular relates to a slow-release fertilizer, a preparation method of the fertilizer and an application of the fertilizer. Background technique [0002] Slow (controlled) release fertilizers are currently a hot spot in fertilizer innovation. At present, as far as its slow-release objects are concerned, it is mainly nitrogen fertilizer, with an emphasis on urea. As far as its sustained release type is concerned, it mainly includes: (1) coated type (such as: sulfur-coated urea, resin coated urea, compound coated urea, ammonium phosphate potassium salt coated urea, etc.); (2) synthetic type slightly soluble (such as: urea formaldehyde, magnesium ammonium phosphate, etc.); (3) chemical inhibitor type (such as: stable fertilizer, etc.); (4) matrix compound and cemented controlled release type (such as: loss control fertilizer, humic acid type fertilizer, etc.) . In particular, coated fertilizer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/08C05G3/90
Inventor 黄道跟乔生
Owner 山东鲁虹智慧农业研究院
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