Environment-friendly slow-release coated urea fertilizer and preparation method thereof

A slow-release bag and environment-friendly technology, applied in layered/coated fertilizers, fertilizer mixtures, fertilization devices, etc., can solve the problems of insufficient film strength and poor water resistance, achieve good film formation and mechanical properties, and reduce soil bulk density , the effect of improving the utilization rate

Pending Publication Date: 2022-07-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water-based polymer coating materials disclosed in patents CN101823917A and CN101182269B have many advantages in terms of price and environmental friendliness, but their large-scale application is limited by insufficient film strength and poor water resistance.

Method used

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  • Environment-friendly slow-release coated urea fertilizer and preparation method thereof
  • Environment-friendly slow-release coated urea fertilizer and preparation method thereof
  • Environment-friendly slow-release coated urea fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Weigh polyvinyl alcohol 31.8g and deionized water 621.25g and add in the three-necked flask equipped with stirrer, condenser and thermometer, heat to 90°C, and dissolve solid polyvinyl alcohol under the stirring of electric stirrer , after the polyvinyl alcohol is completely dissolved, the temperature is lowered to 60 ° C, 3.2 g of polyvinyl pyrrolidone and 15.5 g of water-based acrylate emulsion are added, stirred at a constant temperature for 2 hours, and after complete mixing, the fly ash zeolite with a particle size of 5-10 μm is added. Powder 1.25g, stir at high speed for 1h, and configure into a water-based composite solution.

[0036] (2) put 700g of urea particles with a particle size of 2 to 4 mm into the fluidized bed, preheat for 10 to 20 min at a temperature of 50 to 60 ° C, and slowly feed the (1) gained water-based composite solution through a peristaltic pump. The injection is atomized by the high-pressure gas provided by the air compressor, and the coa...

Embodiment 2

[0039] (1) Weigh polyvinyl alcohol 38.2g and deionized water 606.25g and add in the three-necked flask equipped with stirrer, condenser and thermometer, heat to 90°C, and dissolve solid polyvinyl alcohol under the stirring of electric stirrer , after the polyvinyl alcohol is completely dissolved, the temperature is lowered to 60 ° C, 3.8 g of polyvinyl pyrrolidone and 18.5 g of water-based acrylate emulsion are added, stirred at a constant temperature for 2 hours, and after complete mixing, the fly ash zeolite with a particle size of 5 to 10 μm is added. Powder 1.5g, stir at high speed for 1h, and configure into a water-based composite solution.

[0040] (2) put 700g of urea particles with a particle size of 2 to 4 mm into the fluidized bed, preheat for 10 to 20 min at a temperature of 50 to 60 ° C, and slowly feed the (1) gained water-based composite solution through a peristaltic pump. The injection is atomized by the high-pressure gas provided by the air compressor, and the...

Embodiment 3

[0043] (1) Weigh polyvinyl alcohol 44.5g and deionized water 589.25g and add in the three-necked flask equipped with stirrer, condenser and thermometer, heat to 90°C, and dissolve solid polyvinyl alcohol under the stirring of electric stirrer , after the polyvinyl alcohol is completely dissolved, the temperature is lowered to 60 ° C, 4.5 g of polyvinyl pyrrolidone and 22 g of water-based acrylate emulsion are added, stirred at a constant temperature for 2 hours, and after complete mixing, the fly ash zeolite powder with a particle size of 5 to 10 μm is added. 1.75g, stirred at high speed for 1h, and configured into a water-based composite solution.

[0044] (2) put 700g of urea particles with a particle size of 2 to 4 mm into the fluidized bed, preheat for 10 to 20 min at a temperature of 50 to 60 ° C, and slowly feed the (1) gained water-based composite solution through a peristaltic pump. The injection is atomized by the high-pressure gas provided by the air compressor, and ...

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Abstract

The invention provides an environment-friendly slow-release coated urea fertilizer and a preparation method thereof, the slow-release coated urea fertilizer comprises urea, an inner slow-release layer and an outer protective layer, the inner slow-release layer is a water-based copolymer-fly ash zeolite composite film, and the outer protective layer is palm oil. Weighing polyvinyl alcohol and deionized water, heating and stirring; cooling after the polyvinyl alcohol is completely dissolved, adding polyvinylpyrrolidone and a water-based acrylate emulsion, stirring at a constant temperature, adding fly ash zeolite powder after the polyvinyl alcohol and the water-based acrylate emulsion are completely and uniformly mixed, and continuously stirring to obtain a water-based composite solution; atomizing the water-based composite solution through high-speed hot air flow, uniformly spraying the atomized water-based composite solution on the surfaces of preheated urea particles, and ventilating and drying to form a slow-release layer; and spraying palm oil on the surface of the slow-release layer, discharging, and naturally cooling to obtain the environment-friendly slow-release coated urea fertilizer. The environment-friendly slow-release coated urea fertilizer disclosed by the invention integrates the functions of controlling nutrient release and retaining water, and is a fertilizer with the functions of controlling nutrient release, resisting drought, saving water and improving a soil structure.

Description

technical field [0001] The invention belongs to the technical field of fertilizer preparation, in particular to an environment-friendly slow-release coated urea fertilizer and a preparation method thereof. Background technique [0002] my country is a big country in agricultural production, and both the production and use of chemical fertilizers rank first in the world. However, the effective nutrient utilization rate of chemical fertilizers in my country is low, which not only leads to huge waste of energy and financial resources, but also causes serious pollution of soil and water bodies. Therefore, how to greatly improve the utilization rate of chemical fertilizers and realize the sustainable development of agriculture and the environment is an important problem that needs to be solved urgently to ensure food and environmental security. Application of coated slow-release fertilizer is an important way to solve this problem. [0003] Coated slow-release fertilizer refers ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/40C05G5/30C05G3/80
CPCC05G3/40C05G5/37C05G3/80C05C9/00
Inventor 雷涛张明郭向红周义仁马娟娟孙西欢郑利剑鞠晓兰
Owner TAIYUAN UNIV OF TECH
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