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Multi-coating structured controlled release fertilizer and preparation method thereof

A controlled-release fertilizer and coating technology, applied in layered/coated fertilizers, fertilizer forms, inorganic fertilizers, etc., can solve the problems of investment, high maintenance intensity, and inability to apply field agriculture

Pending Publication Date: 2018-06-08
ZHENGZHOU GAOFU FERTILIZER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method can only be applied in a small area such as a specific place such as a greenhouse, and the investment and maintenance intensity is high, so it cannot be applied to field agriculture.

Method used

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  • Multi-coating structured controlled release fertilizer and preparation method thereof
  • Multi-coating structured controlled release fertilizer and preparation method thereof
  • Multi-coating structured controlled release fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] Specifically, polyurea formaldehyde is mainly prepared by the following steps: mixing urea and formaldehyde in a molar ratio of 1-2.5:1, adjusting the pH value of the reaction system to 7.5-11.5, the temperature at 50°C-75°C, and then adjusting the pH Value to 2.5 ~ 5.5.

[0028] Compared with the traditional preparation method of polyurea-formaldehyde, the traditional preparation of polyurea-formaldehyde is to dissolve granular urea in water first, then add formaldehyde solution, heat the mixed solution to a certain temperature, adjust the pH value, and make it methylolate reaction. After the reaction is completed, adjust the pH value and temperature to allow polymerization to occur. The polyurea formaldehyde prepared by the traditional method is a suspension, and the polymerization reaction occurs completely in water. In this preparation method, the water content is as high as more than 70% after the polymerization reaction is completed, and part of the water needs ...

Embodiment 1

[0077] Embodiment 1 Special fertilizer for corn in Henan area

[0078] According to the law of corn fertilizer requirement on the alluvial plain soil of the Yellow River and the test results of the test field soil obtained from the literature, the release and utilization rate of various nutrient elements in the slow-release fertilizer with multi-layer coating structure were understood in the previous plot test. The fertilizer core 100, each fertilizer layer 110, and the coating layer 120 were designed on the basis of the fertilizer. According to the design, a special fertilizer for corn with a content of 27-8-5 was produced, and a field test was carried out.

[0079] Fertilizer raw materials mainly include: urea, 37% formaldehyde solution, powdery monoammonium phosphate with a content of 11-44-0, potassium chloride with a content of 0-0-60, zinc sulfate, and dolomite powder.

[0080] Calculate the ratio of each element according to the preparation of 1000kg of corn special fer...

Embodiment 2

[0086] Embodiment 2 special fertilizer for wheat in Henan area

[0087] According to the law of wheat fertilizer requirement on the fluvo-aquic light soil in the alluvial plain of the Yellow River obtained from the literature, the test results of the soil in the test field, and the release and utilization rate of various nutrient elements in the multi-layer coated slow-release fertilizer in the previous plot test. The fertilizer core 100, each fertilizer layer 110, and the coating layer 120 were designed on the basis of the fertilizer, and a special fertilizer for wheat with a content of 25-12-8 was produced according to the design, and a field test was carried out.

[0088] Fertilizer raw materials mainly include: urea, 37% formaldehyde solution, powdered monoammonium phosphate with a content of 11-44-0, potassium chloride with a content of 0-0-60, zinc sulfate, borax, and dolomite powder.

[0089] Calculate the ratio of each element according to the preparation of 1000kg of ...

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Abstract

The invention relates to a multi-coating structured controlled release fertilizer and a preparation method thereof and relates to the field of fertilizers. The multi-coatin structured controlled release fertilizer comprises at least two fertilizer layers and at least one coating layer coated layer by layer, wherein the fertilizer layers and the coating layers are arranged in a spaced manner; one fertilizer layer serves as a core of the fertilizer; each of the fertilizer layers comprises at least one of a nitrogen fertilizer, a phosphatic fertilizer and a potassic fertilizer, and each of the coating layers is formed from polyurea ureaformaldehyde which at least comprises polyurea ureaformaldehyde with 2-5 carbon atoms. Elements such as nitrogen, phosphorus, potassium, calcium, magnesium andzinc in the fertilizer can be controlled better to release to meet the demands of different crops on different nutrients in different stages. The controlled release fertilizer is prepared by means ofa reaction kettle, a slurry tank, a dusting groove and accessory facilities thereof, and the amount of fertilizers in each layer and the coated positions of the fertilizer in whole fertilizer particles can be controlled according to a design program. The whole step can be carried out intermittently or continuously, and the fertilizer can be produced on a large scale.

Description

technical field [0001] The invention relates to the field of fertilizers, and in particular to a multi-layer film-coated slow-release fertilizer and a preparation method thereof. Background technique [0002] The growth of crops starts from seeds to maturity, and has gone through the processes of emergence, tillering, jointing, booting, flowering, and seeding, including two stages of vegetative growth and reproductive growth that mainly absorb nutrients, and the amount of nutrients required by each stage is different. , and the original nutrients in the soil generally cannot meet the nutritional needs of crops, and a certain proportion of fertilizers need to be applied. [0003] Most of the fertilizers on the market now contain fixed elements, such as urea is nitrogen fertilizer, ordinary calcium superphosphate contains phosphorus and calcium, potassium dihydrogen phosphate contains phosphorus and potassium, etc., no matter organic fertilizer, inorganic fertilizer, single fe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/08C05G5/00C05G3/90
CPCC05B7/00C05G5/37C05G3/90C05G5/30C05G5/12C05C9/02C05D1/02C05D9/02C05C9/00C05B19/00
Inventor 胡建民刘小勇胡锦哲万培坤白云涛胡书民
Owner ZHENGZHOU GAOFU FERTILIZER CO LTD