Preparation method of biodegradable nitrogen and phosphorus slow-release fertilizer

A technology for biodegradation and chemical fertilizers, applied in the direction of nitrogen fertilizer, phosphate fertilizer, ammonium orthophosphate fertilizer, 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., so as to facilitate industrialization and application, The process cycle is short and the effect of not changing the 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 a biodegradable nitrogen and phosphorus slow-release fertilizer, comprising the following steps:

[0030] a) In parts by weight, 200 parts of carrageenan, 120 parts of soybean lecithin, 140 parts of rapeseed oil, 20 parts of 0.2mol / L potassium dihydrogen phosphate solution, 20 parts of expanded vermiculite, 50 parts of fish protein powder and 60 parts of After the sodium stearate is mixed, ultrasonically disperse for 50 minutes to obtain a mixed liquid; when ultrasonically dispersed, the ultrasonic frequency is 80MHz, and the temperature is 120°C;

[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 air pressure spraying, then dry at 60°C for 40 minutes and cool to room temperature to obtain fertilizer particles;

[0032] c) Take fertilizer masterbatch B which is 1 times the weight of chemical fertilizer granules and puffed corn flour which is 2...

Embodiment 2

[0037] A preparation method of a biodegradable nitrogen and phosphorus slow-release fertilizer, comprising the following steps:

[0038] a) In parts by weight, 200 parts of carrageenan, 130 parts of soybean lecithin, 150 parts of rapeseed oil, 25 parts of 0.3mol / L potassium dihydrogen phosphate solution, 24 parts of expanded vermiculite, 60 parts of fish protein powder and 65 parts of After the sodium stearate is mixed, ultrasonically disperse for 55 minutes to obtain a mixed liquid; when ultrasonically dispersed, the ultrasonic frequency is 85MHz, and the temperature is 125°C;

[0039] b) Take fertilizer masterbatch A, apply a mixture of 35% by weight of fertilizer masterbatch A evenly on the surface of fertilizer masterbatch A by air pressure spraying, then dry at 65°C for 45 minutes and cool to room temperature to obtain fertilizer particles;

[0040] c) Take fertilizer masterbatch B which is 1.1 times the weight of chemical fertilizer granules and puffed corn flour which ...

Embodiment 3

[0045] A preparation method of a biodegradable nitrogen and phosphorus slow-release fertilizer, comprising the following steps:

[0046] a) In parts by weight, 200 parts of carrageenan, 140 parts of soybean lecithin, 160 parts of rapeseed oil, 30 parts of 0.4mol / L potassium dihydrogen phosphate solution, 28 parts of expanded vermiculite, 70 parts of fish protein powder and 70 parts of After the sodium stearate is mixed, ultrasonically disperse for 60 minutes to obtain a mixed liquid; when ultrasonically dispersed, the ultrasonic frequency is 90 MHz, and the temperature is 130°C;

[0047] b) Take fertilizer masterbatch A, apply a mixture of 30 to 40% by weight of fertilizer masterbatch A evenly on the surface of fertilizer masterbatch A by air pressure spraying, then dry at 70°C for 50 minutes and cool to room temperature to prepare Get fertilizer granules;

[0048] c) Take fertilizer masterbatch B which is 1.2 times the weight of chemical fertilizer granules and puffed corn f...

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Abstract

The invention discloses a preparation method of a biodegradable nitrogen and phosphorus slow-release fertilizer and belongs to the field of fertilizer preparation technology. The preparation method comprises the following steps: a) mixing carrageenan, soyabean lecithin, rapeseed oil, a potassium dihydrogen phosphate solution, expanded vermiculite, fish protein powder and sodium stearate, and carrying out ultrasonic dispersion; b) coating a fertilizer master batch A with the mixed liquor, drying and cooling to room temperature so as to prepare fertilizer granules; c) mixing a fertilizer master batch B, expanded corn flour and the fertilizer granules so as to prepare compound fertilizer granules; and d) obtaining beta-cyclodextrin and a potassium nitrate solution, adding the compound fertilizer granules, stirring, drying and cooling to room temperature so as to prepare the biodegradable nitrogen and phosphorus 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, has short technological cycle, causes no wastes, accords with the ideal of atom economy and environmental protection, and 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 a biodegradable nitrogen and phosphorus 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05B1/02C05G3/00C05B7/00C05C1/00C05C5/02C05C7/00C05C11/00C05D1/00C05D9/00C05F11/00
Inventor 韩芬琴
Owner ZHEJIANG JULONG FERTILIZER CO LTD
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