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Coated calcium ammonium nitrate fertilizer and preparation method thereof

A technology of calcium ammonium nitrate and coating, applied in ammonium nitrate fertilizers, fertilizer mixtures, nitrogen fertilizers, etc., can solve the problems that the coating materials cannot be evenly distributed, the adhesion of coating materials is decreased, and the thermal stability of calcium ammonium nitrate is poor, and the The effect of eliminating the heating step, reducing energy and reducing energy consumption

Inactive Publication Date: 2019-12-20
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

There are several reasons for this. First, calcium ammonium nitrate is very easy to absorb moisture. During the granulation and coating process, it needs to be dried. After such treatment, the surface of the fertilizer will be very rough. , the adhesion of the coating material decreases, and the coating cannot be performed
Second, the thermal stability of calcium ammonium nitrate is relatively poor, and the hardness will decrease during the coating process, so the coating material cannot be evenly distributed on the surface of fertilizer particles, and the coating effect is extremely poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: coating calcium ammonium nitrate

[0019] First, the surface treatment liquid A1 was prepared. Weigh 25g of magnesium nitrate hexahydrate and 3.0g of triethylenediamine, and dissolve them in 100g of absolute ethanol in turn to obtain surface treatment solution A1 for use.

[0020] Take by weighing 1 kg of sieved 2mm-4mm calcium ammonium nitrate particles (product of European Chemical Antwerp Co., Ltd.), add it to the water chestnut type sugar coating machine for preheating, test the surface temperature of the fertilizer with an infrared thermometer, when it reaches 40 ° C , take 5g of surface treatment solution A1 and apply it on the surface of calcium ammonium nitrate particles, and stir for 3min to 5min. Then add 8.22g polymethylene polyphenyl isocyanate, 6.21g soybean oil, and 1.20g dibutyl phthalate on the surface of the fertilizer, roll for 7 minutes, wait for the coating liquid to react and solidify to form a film, and then start the second layer of...

Embodiment 2

[0021] Embodiment 2: coating calcium ammonium nitrate

[0022] First, the surface treatment liquid B1 is prepared. Weigh 22g of magnesium nitrate hexahydrate and 3.3g of triethylenediamine, and dissolve them in 100g of absolute ethanol in turn to obtain surface treatment solution B1 for use.

[0023] Take by weighing 1 kg of sieved 2mm-4mm calcium ammonium nitrate particles (product of European Chemical Antwerp Co., Ltd.), add it to the water chestnut type sugar coating machine for preheating, test the surface temperature of the fertilizer with an infrared thermometer, when it reaches 40 ° C , take 6g of surface treatment solution B1 and apply it on the surface of calcium ammonium nitrate particles, and stir for 3min to 5min. Then add 8.88g polymethylene polyphenyl isocyanate, 6.85g soybean oil, and 1.00g dibutyl phthalate on the surface of the fertilizer, roll for 7 minutes, wait for the coating liquid to react and solidify to form a film, and then start the second layer of ...

Embodiment 3

[0024] Embodiment 3: coating calcium ammonium nitrate

[0025] First, the surface treatment liquid C1 is prepared. Weigh 20g of magnesium nitrate hexahydrate and 3.7g of triethylenediamine, and dissolve them in 100g of absolute ethanol in turn to obtain surface treatment solution C1 for use.

[0026] Take by weighing 1 kg of sieved 2mm-4mm calcium ammonium nitrate particles (product of European Chemical Antwerp Co., Ltd.), add it to the water chestnut type sugar coating machine for preheating, test the surface temperature of the fertilizer with an infrared thermometer, when it reaches 40 ° C , take 7g of surface treatment solution C1 and apply it on the surface of calcium ammonium nitrate particles, and stir for 3min to 5min. Then add 9.54g polymethylene polyphenyl isocyanate, 7.54g soybean oil, and 0.80g dibutyl phthalate on the surface of the fertilizer, roll for 7 minutes, wait for the coating liquid to react and solidify to form a film, and then start the second layer of ...

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Abstract

The technical scheme of the invention discloses a coated calcium ammonium nitrate fertilizer preparation method, which comprises: (1) pre-heating calcium ammonium nitrate as a fertilizer core for 0.5-1 h at a temperature of 30-40 DEG C; (2) coating the surface of the pre-heated fertilizer core by using the ethanol solution of magnesium nitrate hexahydrate and triethylene diamine as a surface treatment solution, and stirring for 3-5 min; and (3) adding a coating liquid, rotating for 7-10 min, cooling, and discharging the material. According to the present invention, with the preparation method,by adding a proper amount of triethylene diamine to substantially reduce the energy required by the synthesis process of polyurethane, the synthesis temperature of the polyurethane can be reduced toless than 40 DEG C, and even the polyurethane can be synthesized at a room temperature, such that the temperature exceeding the melting range of the calcium ammonium nitrate particles during the polyurethane synthesis is effectively avoided, and the temperature required by the preparation process is low so as to reduce the energy consumption.

Description

technical field [0001] The invention relates to the technical field of fertilizer production, in particular to a coated calcium ammonium nitrate fertilizer and a preparation method thereof. Background technique [0002] Slow and controlled release fertilizers mainly use traditional fertilizers as core fertilizers, and the outer layer is coated with biodegradable organic coating agents. There are few controlled-release calcium products circulating on the market, including controlled-release calcium ammonium nitrate products, especially polyurethane-coated calcium ammonium nitrate products. There are several reasons for this. First, calcium ammonium nitrate is very easy to absorb moisture. During the granulation and coating process, it needs to be dried. After such treatment, the surface of the fertilizer will be very rough. , the adhesion of the coating material decreases, and the coating cannot be performed. Second, the thermal stability of calcium ammonium nitrate is rela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C1/02C05G3/00C05G3/08
CPCC05C1/00C05C1/02
Inventor 石称华钱志红
Owner 上海永通生态工程股份有限公司
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