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Biodegradable coated carbamide and preparation method thereof

A technology of coated urea and biodegradation, applied in the field of completely biodegradable coated urea and its preparation, can solve the problems of secondary soil pollution, adverse effects on soil and crop growth, etc., achieve uniform and complete film layer, improve physical and storage Transport performance, better atomization effect

Inactive Publication Date: 2010-06-09
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these fertilizers have good slow-release properties, because their wall materials are difficult to degrade or take decades to degrade, the long-term application of fertilizers will inevitably form the accumulation of film materials in the soil, which will inevitably have adverse effects on soil and crop growth. adverse effects
In severe cases, it will cause secondary pollution of the soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: 8% coated urea (fat core urea is granular urea with a particle size greater than 1.0mm)

[0032] Take 1kg of polybutylene succinate and fully dissolve it in 8L of chloroform. The amount of polybutylene succinate is 8% of the weight of urea; add 0.03kg of talc and 0.03 to the fully dissolved solution kg polyethylene glycol, urea weight 0.3% barium sulfate powder, mixed with a mixer, poured into a fluidized bed storage tank, sprayed on the surface of the fluidized urea particles, about 0.75 hours later, on the surface of the urea particles A uniform and complete film is formed.

[0033] After the coating is completed: the membrane material is 7.8% of the fertilizer weight, and the fertilizer N content is 42.7%.

[0034] The operating parameters of the fluidized bed are: the inlet air temperature is 60°C, the compressed air pressure is 0.8MPa, and the nozzle atomization pressure is 0.2MPa.

[0035] The results of the dissolution test in 25°C water are: weigh 15g of fer...

Embodiment 2

[0036] Example 2: 13% coated urea (fat core urea is granular urea with a particle diameter greater than 1.0mm)

[0037] Dissolve 0.9kg polybutylene succinate in 8L of chloroform, and the amount of polybutylene succinate is 11.7% of the weight of urea; add 0.1kg to the solution before coating the urea Carboxymethyl cellulose, 0.02kg quartz sand, 0.01kg polypropylene sebacate are poured into a fluidized bed storage tank with a stirring device, mixed with a stirrer, and sprayed on the fluidized urea particles On the surface, after about 1 hour, a uniform and complete film is formed on the surface of the urea particles.

[0038] After the coating is completed: the membrane material is 12.5% ​​of the fertilizer weight, and the fertilizer N content is 40.3%.

[0039] The operating parameters of the fluidized bed are: inlet air temperature 65°C, compressed air pressure 0.8MPa, nozzle atomization pressure 0.3MPa.

[0040] The results of the dissolution test in 25°C water are: weigh 15g of fe...

Embodiment 3

[0041] Example 3: 8% coated urea (fat core urea is granular urea with a particle diameter greater than 1.0mm)

[0042] Take 0.8 kg of polybutylene succinate and fully dissolve it in 7L of chloroform, and polybutylene succinate is 6.4% of the weight of urea. Before coating the urea, add 0.02kg carboxymethyl cellulose, 0.02kg borax, 0.01kg polyethylene glycol, 0.4% CHA and 2% thiourea to the solution. After being evenly stirred in the fluidized bed storage tank, it is sprayed on the surface of the fluidized urea particles. After about 0.8 hours, a uniform and complete film is formed on the surface of the urea particles.

[0043] After the coating is completed: the membrane material is 7.6% of the fertilizer weight, and the fertilizer N content is 42.5%.

[0044] The operating parameters of the fluidized bed are: inlet air temperature 60°C, compressed air pressure 0.6MPa, nozzle atomization pressure 0.3MPa.

[0045] The results of the dissolution test in 25°C water are: weigh 15g of fer...

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Abstract

The invention relates to coated carbamide, in particular to a totally biodegradable coated carbamide and a preparation method thereof. The coated carbamide consists of a coated layer and a carbamide core. The main body of the coated layer is polylactic acid and / or polybutylene succinate. The coating process adopts fluidized bed spraying-coated technology, and comprises the following steps: dissolving polylactic acid and / or polybutylene succinate in trichloromethane, adding carboxymethylcellulose, organic and / or inorganic conditioner, urease and / or nitrification inhibitor in the solution, spraying and coating the surfaces of the fluidized carbamide after uniformly mixing the mixture under the stirring of a stirrer to form the uniform and complete organic polymeric membrane layer. The process has the advantages of easy implementation, and capacity of effectively slowing down the release of the nutrient to the outside and the conversion rate of nitrogen in soils, effectively controlling the release of the nitrogen nutrient in soils, and reducing the pressure on environment caused by the rapid release of nutrient. The coated material can be totally biodegradable, and the degradation products have no secondary pollution to the environment.

Description

Technical field [0001] The invention relates to coated urea, in particular to a completely biodegradable coated urea and a preparation method thereof. Background technique [0002] Traditional chemical fertilizers, especially nitrogen fertilizers, are easily lost through volatilization, leaching and runoff, so the utilization rate has not been high. The utilization rate of nitrogen fertilizer in the current season is only 30%-40%. The low utilization rate of nitrogen fertilizer is not only unfavorable to the increase of crop yields, low economic benefits, but also affects the quality of agricultural products, and also causes atmospheric N 2 O and NO X Pollution, groundwater nitrate accumulation and water eutrophication are serious ecological and environmental problems. [0003] In order to improve the utilization rate of fertilizers and reduce the environmental pressure caused by fertilization, the production of slow-release high-efficiency fertilizers has become an important direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05C9/00
Inventor 武志杰刘兴斌陈利军
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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