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Preparation method of slow-release fertilizer

A chemical fertilizer and slow-release technology, applied in nitrogen fertilizers, potash fertilizers, phosphate fertilizers, etc., can solve the problems of high cost, unfavorable large-scale promotion and application, difficulty in controlling the slow-release rate, and difficult biodegradation, etc. Short, does not change the effect of soil environment

Inactive Publication Date: 2017-02-08
ZHEJIANG JULONG FERTILIZER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Slow-release chemical fertilizers have the following advantages: 1) reduce nutrient loss and improve fertilizer utilization, 2) reduce chemical and biological fixation in the soil that causes plants to be unusable, 3) reduce denitrification and nitrogen nitrification Nitrogen loss; however, the existing slow-release fertilizers have the following problems: 1) The film-forming materials of the coating layer are mostly synthetic polymers, which are not easy to biodegrade; 2) Direct use of pure starch or various plant straw powders plus chemical bonding The sustained release period is short or the sustained 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of slow-release chemical fertilizer, comprising the following steps:

[0030] a) In parts by weight, after mixing 200 parts of sodium alginate, 120 parts of lecithin, 150 parts of vegetable oil and 50 parts of potassium dodecylbenzenesulfonate, ultrasonically disperse at a temperature of 120 °C and a frequency of 80 MHz for 60 minutes , to obtain a mixture;

[0031] b) Take fertilizer masterbatch A, apply a mixture of 30% by weight of fertilizer masterbatch A evenly on the surface of fertilizer masterbatch A by vacuum spraying, then dry at 60°C for 40 minutes and cool to room temperature to obtain fertilizer particles;

[0032] c) Mix fertilizer masterbatch B with 50% weight of fertilizer granules and gelatinized starch with 20% weight of fertilizer granules with fertilizer granules, stir and mix at 50°C for 30 minutes to prepare compound fertilizer granules;

[0033] d) Take β-cyclodextrin 20% by weight of compound fertilizer granules and water 2...

Embodiment 2

[0037] A preparation method of slow-release chemical fertilizer, comprising the following steps:

[0038] a) In parts by weight, after mixing 200 parts of sodium alginate, 135 parts of lecithin, 155 parts of vegetable oil and 60 parts of potassium dodecylbenzenesulfonate, ultrasonically disperse at a temperature of 125 °C and a frequency of 85 MHz for 70 minutes , to obtain a mixture;

[0039] b) Take fertilizer masterbatch A, apply a mixture of 40% by weight of fertilizer masterbatch A evenly on the surface of fertilizer masterbatch A by vacuum spraying, then dry at 65°C for 50 minutes and cool to room temperature to obtain fertilizer particles;

[0040] c) Mix fertilizer masterbatch B with 55% weight of fertilizer granules and gelatinized starch with 22% weight of fertilizer granules with fertilizer granules, stir and mix at 55°C for 35 minutes to prepare compound fertilizer granules;

[0041] d) Take β-cyclodextrin of 25% by weight of compound fertilizer granules and wate...

Embodiment 3

[0045] A preparation method of slow-release chemical fertilizer, comprising the following steps:

[0046] a) In parts by weight, after mixing 200 parts of sodium alginate, 150 parts of lecithin, 160 parts of vegetable oil and 70 parts of potassium dodecylbenzenesulfonate, ultrasonically disperse at a temperature of 130 °C and a frequency of 90 MHz for 80 minutes , to obtain a mixture;

[0047] b) Take fertilizer masterbatch A, apply a mixture of 50% by weight of fertilizer masterbatch A evenly on the surface of fertilizer masterbatch A by vacuum spraying, then dry at 70°C for 60 minutes and cool to room temperature to obtain fertilizer particles;

[0048] c) Mix fertilizer masterbatch B with 60% weight of fertilizer granules and gelatinized starch with 25% weight of fertilizer granules with fertilizer granules, stir and mix at 60°C for 40 minutes to prepare compound fertilizer granules;

[0049] d) Take β-cyclodextrin 30% by weight of compound fertilizer granules and water 1...

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Abstract

The invention discloses a preparation method of the slow-release fertilizer and belongs to the field of fertilizer manufacture technology. The preparation method comprises the following steps: a) mixing sodium alginate, lecithin, plant oil and dodecylbenzenesulfonic acid, potassium salt, and carrying out ultrasonic dispersion to obtain mixed liquor; b) uniformly coating the surface of fertilizer master batch A with the mixed liquor by a vacuum spray mode, drying and cooling to room temperature so as to prepare fertilizer granules; c) mixing fertilizer master batch B and gelatinized starch and the fertilizer granules so as to prepare composite fertilizer granules; and d) mixing beta-cyclodextrin and composite fertilizer water and stirring to obtain a paste, adding the composite fertilizer granules, stirring, drying and cooling to room temperature so as to prepare the slow-release fertilizer. The method is suitable for preparation of a water-soluble slow-release fertilizer. The coating material is a degradable material and is pollution-free to soil. The technology of the invention is simple and convenient to operate. The period of the technological process is short, and no waste is generated. The method accords with the idea of atom economy and environment protection. The invention is beneficial to industrial promotion and application.

Description

technical field [0001] The invention relates to the technical field of chemical fertilizer manufacturing, in particular to a preparation method of slow-release chemical fertilizer. 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. The production and usage of chemical fertilizers in my country ranks first in the world, and the output accounts for about 20% of the world's chemical 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, resulting The physical properties of soil continue to deteriora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05B1/02C05G3/00C05G5/30C05C7/00C05C9/00C05D1/02C05D9/00C05F5/002
Inventor 韩芬琴
Owner ZHEJIANG JULONG FERTILIZER CO LTD
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