Biodegradable coated compound fertilizer and preparation method thereof

A biodegradable and compound fertilizer technology, applied in the field of coated compound fertilizer and its preparation, can solve the problems of soil secondary pollution, impact, poor soil and crop growth, etc., achieve delayed release rate, reduce adhesion, improve physical and storage effect on performance

Inactive Publication Date: 2010-06-09
SHENYANG INST OF APPLIED 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 inevit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: the coated compound fertilizer of 8% coated amount (fertilizer core is the particle compound fertilizer that particle diameter is greater than 2.0mm)

[0032] 1kg polylactic acid is fully dissolved in 10L chloroform, and polylactic acid consumption is 8% of fertilizer core weight; Add 0.03 borax, 0.01kg polytrimethylene sebacate in the solution after fully dissolving, mix under agitator stirring Pour it into the fluidized bed liquid storage tank after mixing, and spray it on the surface of the fluidized compound fertilizer particles. After about 1 hour, a uniform and complete film layer is formed on the surface of the fertilizer core.

[0033] After the coating is completed: the film material is 7.5% of the weight of the fertilizer, and the nutrient content of the fertilizer is 40.5%.

[0034] The operating parameters of the fluidized bed are: inlet air temperature 45°C, compressed air pressure 0.4MPa, nozzle atomization pressure 0.2MPa.

[0035]The resul...

Embodiment 2

[0036] Embodiment 2: the coated compound fertilizer of 13% coated amount (fertilizer core is the compound fertilizer that particle diameter is greater than 2.0mm)

[0037] Fully dissolve 1kg of polylactic acid in 10L of chloroform, and the dosage of polylactic acid is 13% of the weight of the fertilizer core; add 0.02kg of talcum powder and 0.03kg of polyethylene glycol to the solution after fully dissolving, and mix under stirring with a stirrer. After dissolving, pour it into a fluidized bed liquid storage tank, and spray it on the surface of the fluidized compound fertilizer particles. After about 1 hour, a uniform and complete film layer is formed on the surface of the compound fertilizer particles.

[0038] After the coating is completed: the coating film material is 12.1% of the weight of the fertilizer, and the nutrient content of the fertilizer is 39.2%.

[0039] The operating parameters of the fluidized bed are: inlet air temperature 45°C, compressed air pressure 0.8M...

Embodiment 3

[0041] Embodiment 3: the coated compound fertilizer of 8% coated amount (fertilizer core is the particle compound fertilizer that particle diameter is greater than 2.0mm)

[0042] Dissolve 0.7kg polylactic acid in 8L chloroform and fully dissolve, polylactic acid consumption is 5.6% of fertilizer core weight; Add 0.3kg methylcellulose, 0.01kg calcium magnesium phosphate fertilizer, 0.02kg poly Propylene glycol sebacate and 2% thiourea by weight of the fertilizer are miscible under the stirring of the agitator and poured into the fluidized bed liquid storage tank, sprayed on the surface of the fluidized compound fertilizer granules, and after about 1 hour, in the fertilizer core A uniform and complete film layer is formed on the surface.

[0043] After the coating is completed: the film material is 7.6% of the weight of the fertilizer, and the nutrient content of the fertilizer is 40.5%.

[0044] The operating parameters of the fluidized bed are: inlet air temperature 45°C, co...

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Abstract

The invention relates to a coated compound fertilizer, in particular to a totally biodegradable coated compound fertilizer and a preparation method thereof. The coated compound fertilizer consists of a coated layer and a compound fertilizer 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, urease and/or nitrification inhibitor, organic and/or inorganic conditioner in the solution, spraying and coating the surfaces of the fluidized compound fertilizer granules 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 fertilizer nutrient to the outside and the conversion rate of nitrogen in soils, effectively controlling the release and conversion of the fertilizer 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 a coated compound fertilizer, in particular to a fully biodegradable coated compound fertilizer and a preparation method thereof. Background technique [0002] Due to the loss of volatilization, leaching and runoff, the utilization rate of traditional chemical fertilizers, especially nitrogen fertilizers, is only 30% to 40% or even lower in the current season. The low utilization rate of nitrogen fertilizer is not only unfavorable to the increase of crop yield, but also affects the quality of agricultural products, low economic benefits, and causes atmospheric N 2 O and NO X Pollution, groundwater nitrate accumulation and water eutrophication are serious ecological and environmental problems. The loss of phosphate fertilizer cannot be ignored, because it is one of the essential nutrients for organisms to synthesize life substances, and it is the limiting factor for the pollution of most inland water bodies. [0003] In order...

Claims

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Application Information

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IPC IPC(8): C05G3/00
Inventor 武志杰刘兴斌陈利军
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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