Polyurethane coated calcium ammonium nitrate and manufacturing method thereof

A technology of calcium ammonium nitrate and manufacturing method, applied in nitrate fertilizer, layered/coated fertilizer, nitrogen fertilizer, etc., can solve the problem that the coating material cannot be evenly distributed, the controlled-release calcium ammonium nitrate product is few, and the adhesion of coating material To maintain the effective nitrogen content, reduce energy consumption, and avoid the reduction of particle strength

Inactive Publication Date: 2019-03-08
上海永通生态工程股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are few controlled-release calcium ammonium nitrate products circulating on the market, especially polyurethane-coated calcium ammonium nitrate products
There are mainly the following reasons: First, calcium ammonium nitrate is very easy to absorb moisture, and it needs to be dried during the granulation and coating process. However, after drying, a layer of white powder will form on the surface of the fertilizer, resulting in The surface of the fertilizer becomes rough, the adhesion of the coating material decreases, and coating cannot be performed; second, the thermal stability of calcium ammonium nitrate is relatively poor, and the hardness will decrease during the coating process, resulting in the inability of the coating material to be evenly distributed on the fertilizer. Core surface, thus unable to coat

Method used

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  • Polyurethane coated calcium ammonium nitrate and manufacturing method thereof
  • Polyurethane coated calcium ammonium nitrate and manufacturing method thereof
  • Polyurethane coated calcium ammonium nitrate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Start the sugar-coating machine, adjust the speed of the sugar-coating machine to 22 rpm, and turn on the electric heating switch. Weigh 1 kg of 2-4 mm calcium ammonium nitrate produced by European Chemical Antwerp Company, preheat it in the fluidized state in the sugar coating machine, and test the surface temperature of the fertilizer with an infrared thermometer. When it reaches 40 ° C, it will be saturated for six Magnesium nitrate hydrate was sprayed onto the particle surface, and the temperature was programmed to rise at 5°C as an interval, and each interval lasted for 5 minutes until the temperature rose to 70°C. At this time, hot air at 60-70° C. is passed through for drying, and the drying time is 15 minutes. Then spray the polyurethane coating solution that was mixed and preheated to 80° C. on the surface of the fertilizer, including: 8.22 g of polymethylene polyphenyl isocyanate, 6.21 g of soybean oil, and 1.00 g of dibutyl phthalate. Adjust the rotation spe...

Embodiment 2

[0035] Start the sugar-coating machine, adjust the speed of the sugar-coating machine to 22 rpm, and turn on the electric heating switch. Weigh 1kg of 2-4mm calcium ammonium nitrate produced by Shanxi Jiaocheng Hongxing Chemical Co., Ltd., preheat it in the fluidized state in the sugar coating machine, and test the surface temperature of the fertilizer with an infrared thermometer. When it reaches 40°C , spray saturated magnesium nitrate hexahydrate onto the surface of the particles, program temperature rise, 5°C as an interval, each interval lasts 5 minutes, until the temperature rises to 70°C. At this time, hot air at 60-70° C. is passed through for drying, and the drying time is 15 minutes. Then spray the polyurethane coating solution that was mixed and preheated to 80° C. on the surface of the fertilizer, including: 8.22 g of polymethylene polyphenyl isocyanate, 6.21 g of soybean oil, and 1.00 g of dibutyl phthalate. Adjust the rotation speed to 35 rpm, roll for 7 minutes...

Embodiment 3

[0037]Start the sugar-coating machine, adjust the speed of the sugar-coating machine to 22 rpm, and turn on the electric heating switch. Weigh 1kg of 2-4mm calcium ammonium nitrate produced by Taiyuan Xinjida Chemical Co., Ltd., preheat it in the fluidized state in the sugar coating machine, and test the surface temperature of the fertilizer with an infrared thermometer. When it reaches 40°C , spray saturated magnesium nitrate hexahydrate onto the surface of the particles, program temperature rise, 5°C as an interval, each interval lasts 5 minutes, until the temperature rises to 70°C. At this time, hot air at 60-70° C. is passed through for drying, and the drying time is 15 minutes. Then spray the polyurethane coating solution that was mixed and preheated to 80° C. on the surface of the fertilizer, including: 8.22 g of polymethylene polyphenyl isocyanate, 6.21 g of soybean oil, and 1.00 g of dibutyl phthalate. Adjust the rotation speed to 35 rpm, roll for 7 minutes, turn off ...

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Abstract

The invention discloses a manufacturing method of polyurethane coated calcium ammonium nitrate and polyurethane coated calcium ammonium nitrate manufactured with the method. Particularly, the method comprises the following steps: placing calcium ammonium nitrate in a rotating drum for preheating; preparing a fertilizer surface treatment liquid and uniformly applying the fertilizer surface treatment liquid to the surface of preheated calcium ammonium nitrate to form a liquid film; performing programmed temperature rise; pre-mixing all the raw materials forming a polyurethane coating liquid, preheating and spraying the polyurethane coating liquid to the surface of calcium ammonium nitrate; performing rotating and cooling, and curing the polyurethane coating to obtain polyurethane coated calcium ammonium nitrate. The manufacturing method, which is provided by the technical scheme, of polyurethane coated calcium ammonium nitrate can improve surface defects and thermal stability of calciumammonium nitrate, so that obtained polyurethane coated calcium ammonium nitrate has higher integrity and lower initial dissolution rate.

Description

technical field [0001] The invention relates to a film-coated controlled-release fertilizer and a manufacturing method thereof, in particular to a method for manufacturing polyurethane-coated calcium ammonium nitrate and the polyurethane-coated calcium ammonium nitrate manufactured by the manufacturing method. Background technique [0002] Calcium ammonium nitrate is a new type of high-efficiency compound fertilizer composed of ammonium nitrate and calcium nitrate. Its fertilizer effect is fast and it has the characteristics of rapid nitrogen supplementation. Calcium and magnesium are added in it, and the nutrients are more comprehensive and can be directly absorbed by plants. At the same time, as a neutral fertilizer, it is suitable for a variety of soils, and because of its low physiological acidity, it can improve acidic soils. After being applied to the soil, the pH value is low, which will not cause soil compaction, and can make the soil loose. [0003] Generally speak...

Claims

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Application Information

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IPC IPC(8): C05G3/08C05C5/00C05G3/90
CPCC05C5/00C05G3/90C05G5/37
Inventor 石称华钱志红闫庆贺
Owner 上海永通生态工程股份有限公司
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