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A composite layer slow-release chemical fertilizer and its preparation method

A compound layer and chemical fertilizer technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of high cost, unfavorable for large-scale promotion and application, difficulty in controlling the slow release rate, and expensive coating materials, so as to facilitate the promotion of industrialization The effect of short application and process cycle and low cost

Inactive Publication Date: 2016-03-23
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing slow-release chemical fertilizers have the following problems: 1. Most of the film-forming materials of the coating layer are synthetic high molecular polymers, which are not easy to biodegrade
2. Directly use pure starch or various plant straw powders plus chemical adhesives to wrap, the slow-release period is short or the slow-release rate is difficult to control
3. The coating materials used are expensive, such as coupling agents such as silane, titanate or aluminate, and the high cost is not conducive to large-scale application

Method used

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  • A composite layer slow-release chemical fertilizer and its preparation method
  • A composite layer slow-release chemical fertilizer and its preparation method
  • A composite layer slow-release chemical fertilizer and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] like figure 1 As shown, a compound layer slow-release chemical fertilizer is coated with a first coating layer and a second coating layer in sequence on the dry original fertilizer 1 particle surface, and the first coating layer is a sub-hydrophobic modified layer 2 , the second coating layer is a hydrophobic modification layer 3 .

[0032] Preparation:

[0033] The first step: drying chemical fertilizer: put a certain quality of urea in an oven, and dry it at 80°C for 3 hours to obtain the inner layer;

[0034] The second step: preparation of oxidized molasses starch ester (SME glue): add 100 parts by mass of corn starch and beet oxidized molasses (the mass ratio of starch to oxidized molasses is 1:1) mixture into the reactor, at 30 °C, the frequency 60MH Z Next, ultrasonic vibration for 30min. Obtain a brown viscous liquid, filter out the solid acid catalyst to obtain SME glue, cool it for later use;

[0035] The third step: making sub-hydrophobic modified layer...

Embodiment 2

[0038] like figure 1 As shown, a compound layer slow-release chemical fertilizer is coated with a first coating layer and a second coating layer in sequence on the dry original fertilizer 1 particle surface, and the first coating layer is a sub-hydrophobic modified layer 2 , the second coating layer is a hydrophobic modification layer 3 .

[0039] Preparation:

[0040] The first step: dry chemical fertilizer: put a certain quality of ammonium bicarbonate in an oven, and dry it at 80°C for 3 hours to get the inner layer;

[0041] Step 2: Preparation of oxidized molasses starch ester (SME glue): add 100 mass parts of corn starch and beet oxidized molasses (the mass ratio of starch to oxidized molasses is 1:1) mixture into the reaction kettle, at 30 ° C, the frequency 80MH Z Next, ultrasonic vibration for 20min. Obtain a brown viscous liquid, filter out the solid acid catalyst to obtain SME glue, cool it for later use;

[0042] The third step: making the sub-hydrophobic mod...

Embodiment 3

[0045] like figure 1 As shown, a compound layer slow-release chemical fertilizer is coated with a first coating layer and a second coating layer in sequence on the dry original fertilizer 1 particle surface, and the first coating layer is a sub-hydrophobic modified layer 2 , the second coating layer is a hydrophobic modification layer 3 .

[0046] Preparation:

[0047] The first step: make dry chemical fertilizer: put a certain quality of potassium sulfate in an oven, and dry it at 150°C for 1 hour. get the inner layer;

[0048] The second step: making oxidized molasses starch ester (SME glue): add 100 parts by mass of corn starch and sugarcane oxidized molasses (the mass ratio of starch to oxidized molasses is 1:1) mixture into the reaction kettle, at 30 ° C, the frequency 40MH Z Next, ultrasonic vibration for 60min. Obtain a brown viscous liquid, filter out the solid acid catalyst to obtain SME glue, cool it for later use;

[0049] The third step: making the sub-hydro...

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Abstract

The invention belongs to the technical field of slow-release chemical fertilizers, in particular to a compound-layer slow-release chemical fertilizer and a preparation method thereof. The technical solution of the present invention is: a composite layer slow-release chemical fertilizer, the surface of the dry original chemical fertilizer particles is sequentially coated with a first coating layer and a second coating layer, and the first coating layer is a sub-hydrophobic modification. The second coating layer is a hydrophobic modification layer. The process is simple and feasible, stable and reliable, low in cost, high in total nutrient, easy to control the slow-release period, and the wrapping material used can be completely biodegradable without changing the soil environment.

Description

technical field [0001] The invention belongs to the technical field of slow-release chemical fertilizers, in particular to a compound-layer slow-release chemical fertilizer and a preparation method thereof. Background technique [0002] Chemical fertilizers play a pivotal role in agricultural production. As a large agricultural country, my country has a high demand for chemical fertilizers in agricultural production. According to statistics, chemical fertilizers have become the largest material investment in agricultural production, accounting for about 50% of all productive expenditures. my country's fertilizer production and usage are the first in the world, of which the output accounts for about 20% of the world's fertilizer production, and the usage has accounted for 28% of the world's chemical fertilizer consumption. However, due to the nature of chemical fertilizers and the requirements for the soil environment, low fertilizer use efficiency has become a common probl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
Inventor 孟平蕊李良波张艳梅
Owner UNIV OF JINAN
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