Extrusion palletizing urea-formaldehyde multi-nutrient element sustained-release fertilizer and preparation method

一种缓控释化肥、营养元素的技术，应用在施肥方法、植物学设备和方法、尿素复合肥等方向，能够解决限制包膜肥料推广和应用、养分单一、缓释周期长等问题，达到规模化生产前景广阔、制备工艺简单有效、节省人力和物力的效果

Active Publication Date: 2018-06-15
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The current slow-release chemical fertilizers are basically physically coated fertilizers, most of which have a core-shell structure with compound fertilizers as the core and insoluble materials as the shell. There are disadvantages such as complex coating process and high cost of membrane materials, which limit the effectiveness of coatings. Promotion and Application of Fertilizers
Especially with the increasing awareness of environmental protection, people gradually realize that these coating materials are difficult to degrade, and they are easy to cause environmental pollution if they remain in the soil.
[0003] Chemical slow-release fertilizers represented by urea-formaldehyde fertilizers can effectively solve various problems in coated fertilizers, but due to the single nutrient and long slow-release period, the application range of urea-formaldehyde fertilizers is limited.
At present, it can only be applied to perennial plants such as forest soil and lawn, but it is difficult to apply it to short-cycle crops such as rice, corn, wheat and vegetables grown on a large scale

Method used

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  • Extrusion palletizing urea-formaldehyde multi-nutrient element sustained-release fertilizer and preparation method
  • Extrusion palletizing urea-formaldehyde multi-nutrient element sustained-release fertilizer and preparation method
  • Extrusion palletizing urea-formaldehyde multi-nutrient element sustained-release fertilizer and preparation method

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Experimental program
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preparation example Construction

[0038] The urea-formaldehyde-based slow-controlled release fertilizer with multi-nutrient elements has a strong hydrogen bond network structure, can release nitrogen nutrients stably and continuously during the entire release period, and makes up for the problem of excessively long nutrient release period of existing urea-formaldehyde fertilizers. The present invention has no special requirements for the preparation method of the aforementioned urea-formaldehyde-based multi-nutrient element slow-controlled release fertilizer, as long as the urea-formaldehyde-based multi-nutrient element slow-controlled release fertilizer with the aforementioned structure can be prepared. According to a preferred embodiment of the present invention, the present invention further provides a method for preparing an extruded and granulated urea-formaldehyde-based multi-nutrient slow-release fertilizer, comprising the following steps:

[0039] (1) Add the calculated amount of formaldehyde and urea r...

Embodiment 1

[0056] A method for preparing an extruded granulated urea-formaldehyde-based multi-nutrient slow-release fertilizer, comprising the following steps:

[0057] (1) Add formaldehyde and urea at a molar ratio of 1:1 to the reactor respectively, adjust the pH of the system to 8, and react at 20° C. for 2 hours to obtain a methylolurea solution. Then add 9g ammonium dihydrogen phosphate and 7g potassium silicate to the reactor successively, and continue the reaction until the system is viscous;

[0058] (2) After solidifying the obtained viscous product at room temperature for 24 hours, extrude the strip with an extruder, then place the strip at 120°C for 1 hour and then cut it into pellets to obtain cylindrical urea-formaldehyde Multi-nutrient slow-release fertilizer.

[0059] The nitrogen content of the urea-formaldehyde-based multi-nutrient element slow-controlled release chemical fertilizer of gained extruding granulation is 21.84%, with P 2 o 5 The phosphorus content of the ...

Embodiment 2

[0061] A preparation method of extruded granulated urea-formaldehyde-based multi-nutrient slow-controlled release fertilizer, comprising the following steps:

[0062] (1) Add formaldehyde and urea with a molar ratio of 1:1.2 to the reactor respectively, adjust the system pH=9, react at 50° C. for 2 hours, and obtain a methylol urea solution. Add 9g of ammonium dihydrogen phosphate and 28g of potassium silicate to the reactor successively afterwards, and continue the reaction until the system is viscous;

[0063] (2) After solidifying the obtained viscous product at room temperature for 0.5 hours, extrude the strips with an extruder, then place the strips at 160°C for 0.5 hours and then cut into pellets to obtain short-section cylinders Urea-formaldehyde-based multi-nutrient slow-release fertilizer.

[0064] The nitrogen content of the urea-formaldehyde-based multi-nutrient slow-release fertilizer of gained extrusion granulation is 15.32%, expressed as P 2 o 5The calculated ...

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Abstract

The invention relates to the field of sustained-release fertilizers, and specifically discloses a urea-formaldehyde multi-nutrient element sustained-release fertilizer and a preparation method. The urea-formaldehyde multi-nutrient element sustained-release fertilizer comprises ammonium polyphosphate, inorganic silica gel and urea formaldehyde, wherein hydrogen bond connection can be formed betweenphosphorus-oxygen double bond of ammonium polyphosphate and a urea formaldehyde molecular chain, hydrogen bond connection can be formed between hydroxyl of inorganic silica gel and the urea formaldehyde molecular chain, and a hydrogen bond associated polymer network structure is formed among ammonium polyphosphate, inorganic silica gel and urea formaldehyde together. The urea-formaldehyde multi-nutrient element sustained-release fertilizer containing a strong hydrogen bond network structure can be prepared by using a conventional aqueous solution polymerization in combination with a normal temperature extrusion palletizing technology, a coating technology in the later period of preparing a coated fertilizer is avoided, the preparation technology is simple and effective, and a great deal of manpower and material resources are saved. According to the extrusion palletizing urea-formaldehyde multi-nutrient element sustained-release fertilizer provided by the invention, nitrogen nutrientscan be stably and sustainedly released in the whole release period, and the disadvantage that an existing urea formaldehyde fertilizer is long in nutrient release period is solved.

Description

technical field [0001] The invention relates to the field of slow-controlled release chemical fertilizers, in particular to an extrusion-granulated urea-formaldehyde-based slow-controlled release chemical fertilizer and a preparation method thereof. Background technique [0002] The current slow-release chemical fertilizers are basically physically coated fertilizers, most of which have a core-shell structure with compound fertilizers as the core and insoluble materials as the shell. There are disadvantages such as complex coating process and high cost of membrane materials, which limit the effectiveness of coatings. Promotion and application of fertilizers. Especially with the increasing awareness of environmental protection, people gradually realize that these coating materials are difficult to degrade, and it is easy to cause environmental pollution if they remain in the soil. [0003] Chemical slow-release fertilizers represented by urea-formaldehyde fertilizers can eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05B7/00
CPCC05B7/00C05G5/12C05C9/02C05D1/00C05B13/00C05B19/00A01C21/00A01G22/00A01G22/20A01G22/22
Inventor 赵贵哲向阳刘亚青赵海东宋江
Owner ZHONGBEI UNIV
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