Instant slow-release nitrogen fertilizer and preparation method thereof

A nitrogen fertilizer and slow-release technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of restricting the rapid popularization of water and fertilizer integration technology, high cost of irrigation and fertilization, lack of slow-release technology, etc. , reduce the number of irrigation, the effect of broad application prospects

Inactive Publication Date: 2015-09-09
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although water-soluble fertilizers can be produced by the above simple mixing method and chemical reaction synthesis method, its shortcomings are also very obvious, as: 1. the product is easy to agglomerate, and the application effect after agglomeration is extremely poor, so it is necessary to add a large amount of preventive fertilizers Caking agent to solve the problem, which increases the production cost
②The nitrogen fertilizers used are all common chemical nitrogen fertilizers. Although they can be quickly dissolved in water, they do not have slow-release technology. Therefore, frequent irrigation and fertilization is required, usually once a week, which results in high costs for irrigation and fertilization and restricts the integration of water and fertilizer. Rapid rollout of technology

Method used

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  • Instant slow-release nitrogen fertilizer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 100kg of urea and 54.85kg of formaldehyde solution with a content of 36.5% (the molar ratio of urea to formaldehyde is 2.5:1) into the reaction kettle, and rapidly raise the temperature to 35-45°C under constant stirring, and use a concentration of 20% The sodium hydroxide solution is used to adjust the pH to 9.5-10, and the reaction is continued for about 1-2 hours to obtain a prepolymer of urea-formaldehyde. Then add organic acid (the weight ratio of oxalic acid, dodecylbenzenesulfonic acid and thioacetic acid is 1:2:0.8), until the pH of urea-formaldehyde prepolymer is 2-3, then add catalyzer 0.47kg (chlorine The weight ratio of ammonium chloride and ammonium persulfate is 1:0.25) and surfactant 0.16kg (the weight ratio of sodium dodecylbenzenesulfonate and alkyl alcohol ether carboxylate is 1:1.5), stir rapidly, about A solid low-molecular-weight slow-release nitrogen fertilizer can be produced within 5-10 minutes, and finally add 0.31 kg of modified synergist (...

Embodiment 2

[0025] Add 100kg of urea and 48.97kg of formaldehyde solution with a content of 36.5% (the molar ratio of urea to formaldehyde is 2.8:1) into the reaction kettle. The sodium hydroxide solution is used to adjust the pH to 9.5-10, and the reaction is continued for about 1-2 hours to obtain a prepolymer. Then add organic acid (the weight ratio of oxalic acid, dodecylbenzenesulfonic acid and thioacetic acid is 1:2:0.8), until the pH of the prepolymer is 2-3, then add catalyzer 0.45kg (ammonium chloride and the weight ratio of ammonium persulfate is 1:0.25) and surfactant 0.15kg (the weight ratio of sodium dodecylbenzenesulfonate and alkyl alcohol ether carboxylate is 1:1.5), stir rapidly, about 5- Solid low-molecular-weight slow-release nitrogen fertilizers can be generated within 10 minutes. Finally, 0.30 kg of modified synergist (the weight ratio of the mixture of polyaspartic acid and acetohydroxamic acid is 1:1.5) is added, and after being ground by a ball mill (95% of the pa...

Embodiment 3

[0027]Add 100kg of urea and 45.71kg of formaldehyde solution with a content of 36.5% (the molar ratio of urea to formaldehyde is 3:1) into the reaction kettle. The sodium solution is used to adjust the pH to 9.5-10, and the reaction is continued for about 1-2 hours to obtain a prepolymer. Then add organic acid (the weight ratio of oxalic acid, dodecylbenzenesulfonic acid and thioacetic acid is 1:2:0.8), until the pH of the prepolymer is 2-3, then add catalyzer 0.44kg (ammonium chloride and the weight ratio of ammonium persulfate is 1:0.25) and surfactant 0.146kg (the weight ratio of sodium dodecylbenzenesulfonate and alkyl alcohol ether carboxylate is 1:1.5), stir rapidly, about 5- Solid low-molecular-weight slow-release nitrogen fertilizers can be generated within 10 minutes. Finally, 0.29 kg of modified synergist (the weight ratio of the mixture of polyaspartic acid and acetohydroxamic acid is 1:1.5) is added and ground by a ball mill. (95% of the particles are less than 1-...

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Abstract

The invention relates to an instant slow-release nitrogen fertilizer and a preparation method thereof. The preparation method comprises the following steps: generating urea and formaldehyde prepolymer by utilizing urea and formaldehyde under heating and continuous stirring conditions, and adding organic acid A into prepolymer to regulate the pH value of the prepolymer to 2-3; then, adding a catalyst B and a surfactant C, and quickly stirring to generate solid slow-release nitrogen fertilizer with low molecular weight; adding a modifying synergist D into the solid low-release nitrogen fertilizer with low molecular weight to mix and grind until 95% of the particles are smaller than 1-3 microns, thereby preparing the water-soluble slow-release nitrogen fertilizer. The instant slow-release nitrogen fertilizer prepared by the preparation method is an excellent slow-release nitrogen fertilizer which is relatively small in molecular weight, easier to dissolve, lower in price, better in anti-caking performance, simpler in processing process, and lower in energy consumption as compared with a conventional common ureaformaldehyde slow-release nitrogen fertilizer.

Description

(1) Technical field [0001] The invention relates to an instant slow-release nitrogen fertilizer and a preparation method thereof, in particular to a fast [0002] The invention relates to a slow-release nitrogen fertilizer which dissolves and has nutrient slow-release performance, and belongs to the field of new fertilizer production. (2) Background technology [0003] Water-soluble fertilizer is a multi-component compound fertilizer that can be completely dissolved in water. It can be quickly dissolved in water and is more easily absorbed by crops, and its absorption and utilization rate is relatively high. More importantly, it can be applied to spray Facility agriculture such as drip irrigation realizes the integration of water and fertilizer, and achieves the efficiency of saving water, fertilizer and labor. At present, with the continuous improvement of facilities, mechanization and automation, instant fertilizer and drip irrigation fertilization technology has become t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 杨越超耿毓清
Owner SHANDONG AGRICULTURAL UNIVERSITY
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