Three-layer enveloping type high-water-absorption slow release fertilizer and preparation method thereof

A technology of slow-release fertilizers and high water absorption, applied in layered/coated fertilizers, fertilizer mixtures, fertilization devices, etc., can solve the problems of high cost, high sealing requirements of production equipment, poor degradability, etc., to improve storage performance, The effect of excellent water absorption and water retention performance and good slow release performance

Inactive Publication Date: 2017-05-17
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of superabsorbent resins in the field of slow-release fertilizers still has problems such as high cost and poor degradability.
[0004] In addition, in the preparation process of many coated fertilizers, in order to dissolve the coated substances (such as polyolefin), organic solvents need to be used, which requires high sealing of the production equipment and increases the complexity of the production process

Method used

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  • Three-layer enveloping type high-water-absorption slow release fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Add urea granules to the disc granulator, rotate at a constant speed, spray molten liquid paraffin at 60°C, and obtain paraffin-coated fertilizer granules after cooling. The weight ratio of paraffin to fertilizer core is 0.5:100.

[0029] (2) Put the paraffin-coated fertilizer granules obtained in step (1) into the disc granulator, spray into the atomized polyvinyl alcohol aqueous solution, the concentration is 5%, and then add the straw charcoal-based superabsorbent resin powder into the granulator. In the granulator, the straw charcoal-based superabsorbent resin powder is wrapped on the outer layer of the fertilizer granules as the middle coating layer of the slow-release fertilizer, and dried after the coating is completed. The mass ratio of straw charcoal-based superabsorbent resin to fertilizer core is 20:100.

[0030] Wherein, the method for preparing straw charcoal-based high water-absorbing slow-release fertilizer comprises the following steps:

[0031] a. ...

Embodiment 2

[0035] (1) Add urea granules to the disc granulator, rotate at a constant speed, spray molten liquid paraffin at 60°C, and obtain paraffin-coated fertilizer granules after cooling. The weight ratio of paraffin to fertilizer core is 1:100.

[0036] (2) Put the paraffin-coated fertilizer granules obtained in step (1) into the disc granulator, spray into the atomized polyvinyl alcohol aqueous solution, the concentration is 10%, and then add the straw charcoal-based superabsorbent resin powder into the granulator. In the granulator, the straw charcoal-based superabsorbent resin powder is wrapped on the outer layer of the fertilizer granules as the middle coating layer of the slow-release fertilizer, and dried after the coating is completed. The mass ratio of straw charcoal-based superabsorbent resin to fertilizer core is 20:100.

[0037] (3) Spray the coated particles of step (2) with styrene-acrylic emulsion, and finally dry to obtain coated slow-release fertilizer. The mass ratio ...

Embodiment 3

[0040] (1) Add urea granules to the disc granulator, rotate at a constant speed, spray molten liquid paraffin at 60°C, and obtain paraffin-coated fertilizer granules after cooling. The weight ratio of paraffin to fertilizer core is 2:100.

[0041] (2) Put the paraffin-coated fertilizer granules obtained in step (1) into the disc granulator, spray into the atomized polyvinyl alcohol aqueous solution, the concentration is 6%, and then add the straw charcoal-based superabsorbent resin powder into the granulator. In the granulator, the straw charcoal-based superabsorbent resin powder is wrapped on the outer layer of the fertilizer granules as the middle coating layer of the slow-release fertilizer, and dried after the coating is completed. The mass ratio of straw charcoal-based superabsorbent resin to fertilizer core is 20:100.

[0042] (3) Spray the coated particles of step (2) with styrene-acrylic emulsion, and finally dry to obtain coated slow-release fertilizer. The mass ratio...

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Abstract

The invention discloses a three-layer enveloping type high-water-absorption slow release fertilizer and a preparation method thereof. The slow release fertilizer is composed of a fertilizer core and enveloping layers, wherein the enveloping layers comprise an inner enveloping layer, a middle enveloping layer and an outer enveloping layer from inside to outside; the inner enveloping layer is made from paraffin; the middle enveloping layer is made from straw carbon based high-water-absorption resin; and the outer enveloping layer is arranged as a styrene-acrylic emulsion layer. In the aspect of enveloping material selection of the slow release fertilizer disclosed by the invention, the paraffin, the straw carbon based high-water-absorption resin and the styrene-acrylic emulsion are respectively selected as the materials of the innermost layer, the middle layer and the outmost layer; the functions of all the enveloping layers are different from each other; the acquired enveloping fertilizer has excellent slow release property, high water absorption property and storage property; the straw gasified by-product is added and compounded with the high-water-absorption resin in the middle layer, so that the cost of the high-water-absorption resin is lowered; and in a preparation process of the slow release fertilizer, no organic solvent is used, the preparation is pollution-free and the process is simple.

Description

technical field [0001] The invention belongs to the field of slow-release fertilizers, and in particular relates to a three-layer coated high water-absorbing slow-release fertilizer and a preparation method thereof. Background technique [0002] Fertilizers play an important role in increasing crop yields. However, there are prominent problems in the application of common chemical fertilizers, such as low utilization rates. At present, the utilization rates of nitrogen fertilizers are only 30%, phosphorus fertilizers are about 15%, and potassium fertilizers are about 45%. A large amount of fertilizer loss not only caused great economic losses, but also caused serious pollution to the environment. Slow-release fertilizers have many advantages over traditional fertilizers, such as reduced fertilizer loss rate, reduced frequency of use, and potential environmental problems caused by excessive use. Therefore, research on slow-release fertilizers has attracted more and more atte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05G3/20C05G5/30C05G5/37C05G5/38
Inventor 张峰侯贵华代少俊崔恩田
Owner YANCHENG INST OF TECH
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