Slow-release fertilizer coating material containing terephthalic polyester polyol and preparation process thereof

A coating material and preparation process technology, applied in fertilizer mixtures, fertilization devices, agriculture, etc., can solve problems such as shortening production time, restricting use, and filming interruption, reducing equipment investment costs, avoiding waste, and fertilizer utilization. improved effect

Inactive Publication Date: 2015-09-23
MAOSHI AGRI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN201410065836.X discloses a solvent-free coated controlled-release fertilizer and its preparation method. The coated material is formed by polymerizing phthalic anhydride polyester diol, isocyanate and microcrystalline paraffin, and sprayed successively through a double-nozzle coating machine. to the surface of the granules, and repeated three times three times to obtain a slow and controlled release fertilizer. Through the improvement of the equipment and the optimization of the spray, the invention limited the number of coating times and shortened the production time, and solved the problem of clogging and interruption of the coating caused by sharing a nozzle. The problem of film speed and coating uniformity, and the increase of output per unit time; but phthalic anhydride polyester polyol is not only expensive, but also has problems such as poor degradation, which restricts its use in farmland

Method used

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  • Slow-release fertilizer coating material containing terephthalic polyester polyol and preparation process thereof
  • Slow-release fertilizer coating material containing terephthalic polyester polyol and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of coated slow-release fertilizer: Heat 1 ton of granular urea with a particle size of 2mm-4mm to 58-65°C in a coating machine, pump 14.1kg of p-phenylene polyester polyol and 11.5kg of crude MDI into the coating machine at the same time On the surface of the moving granular fertilizer, the input amount of the coating material is 0.7~1wt% of the total weight of the granular fertilizer, and it is solidified for 4~6 minutes; repeat the above coating step 3 times until the coating material accounts for 2.5% of the total weight of the core fertilizer. %, adding 0.2%-0.5% paraffin wax to the total mass of the fertilizer, cooling to 20-30°C to prepare a coated slow-release fertilizer.

[0032] Slow and controlled release performance test of coated slow and controlled release fertilizer: Under the condition of 25°C, the nutrient release period of the coated slow and controlled release fertilizer was tested by static water extraction method, and the number of days ...

Embodiment 2

[0036] Preparation of coated slow-release fertilizer: Heat 1 ton of granular urea with a particle size of 2mm-4mm to 58-65°C in a coating machine, mix 11.2kg of p-phenylene polyester polyol with 2.9kg of castor oil Simultaneously pump 11.5kg of coarse MDI into the surface of the constantly moving granular fertilizer, the input amount of the coating material is 0.7-1wt% of the total weight of the granular fertilizer, and solidify for 4-6 minutes; repeat the above coating step 3 times until the coating The coating material accounts for 2.5% of the total amount of the core fertilizer, and 0.2%-0.5% of the total mass of the fertilizer is added with paraffin wax, and cooled to 20-30°C to obtain a coated slow-release fertilizer.

[0037] Slow and controlled release performance test of coated slow and controlled release fertilizer: Under the condition of 25°C, the nutrient release period of the coated slow and controlled release fertilizer was tested by static water extraction meth...

Embodiment 3

[0041] Preparation of coated slow-release fertilizer: heat 1 ton of granular urea with a particle size of 2mm-4mm to 58-65°C in a coating machine, and pump 19.2kg of p-phenylene polyester polyol and 13.9kg of crude MDI into the coating machine at the same time On the surface of the constantly moving granular fertilizer, the input amount of the coating material each time is 0.7-1wt% of the total weight of the granular fertilizer, and solidified for 4-6 minutes; repeat the above coating step 3-5 times until the coating material accounts for the total weight of the core fertilizer. 3.2% of the total mass of the fertilizer, adding 0.2%-0.5% paraffin of the total mass of the fertilizer, cooling to 20-30°C to obtain a coated slow-release fertilizer.

[0042] Slow and controlled release performance test of coated slow and controlled release fertilizer: Under the condition of 25°C, the nutrient release period of the coated slow and controlled release fertilizer was tested by st...

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Abstract

The invention relates to the technical field of slow-release fertilizer, in particular to a slow-release fertilizer coating material containing terephthalic polyester polyol and a preparation process thereof. The preparation process is characterized in that prepared slow-release fertilizer comprises fertilizer particles and the coating material, the fertilizer particles account for 95%-97.5% of the mass of the slow-release fertilizer, and the coating material accounts for 2.5%-5% of the mass of the slow-release fertilizer; the coating material comprises a component A and a component B, the component A accounts for 50%-60%, the component B accounts for 40%-50% of the weight of the coating material, the component A is polyester polyol which is the terephthalic polyester polyol or a composition of the terephthalic polyester polyol and castor oil, and the component B is isocyanate. The prepared slow-release fertilizer has high abrasion resistance, slow release performance and tenacity; a solvent-free coating technology is adopted in the production process, so that the production cost is low, and production efficiency is high; meanwhile, solvent wasting in the recovery process is avoided, and the slow-release fertilizer has certain biodegradability.

Description

technical field [0001] The invention relates to the technical field of slow-release fertilizers, in particular to a slow-release fertilizer coating material containing p-phenylene polyester polyol and a preparation process thereof. Background technique [0002] my country is a country that uses a large amount of fertilizers. Agriculture and animal husbandry are inseparable from fertilizers. However, traditional fertilizers have low utilization rates and high pollution. Soil salinization and water pollution are closely related to the abuse of fertilizers. Different regions and different crops require different chemical fertilizers, so it is necessary to "customize" fertilizers for crops according to different soils and crops. However, as far as China is concerned, the production cost of such fertilizers is very high, and reprocessing may cause Secondary pollution, so the emergence of slow and controlled release fertilizers has improved the utilization rate of fertilizers, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 汪春芬
Owner MAOSHI AGRI TECH CO LTD
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