Composite sulfur enveloped slow release fertilizer

A slow-release fertilizer and sulfur-coated technology, which is applied in the field of coated slow-release fertilizers and compound sulfur-coated slow-release fertilizers, can solve the problems of long release period, limited application fields, and high price of coated slow-release urea , to achieve the effect of stable release period and low cost

Inactive Publication Date: 2007-07-25
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, their release period is not too long, especially the polymer dosage (epoxy resin and polyurethane) of these sulfur compound coated slow-release fertilizers is still on the high side, and the general quality dosage will reach about 4%. T

Method used

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  • Composite sulfur enveloped slow release fertilizer
  • Composite sulfur enveloped slow release fertilizer
  • Composite sulfur enveloped slow release fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The granular industrial urea with a particle size of 2.0-4.0mm is added to the fluidized bed coating equipment, and the granular urea is in a boiling state, and the temperature of the granular urea in the fluidized bed is maintained at 85°C. Slowly spray molten sulfur at about 150°C on the surface of the granular urea, and spray until the quality of the formed sulfur film reaches 10% of the total mass of the final product composite sulfur-coated slow-release urea. Then, the mixture of 4,4-diphenylmethane diisocyanate MDI, triethanolamine and diethylene glycol (the molar ratio of triethanolamine: diethylene glycol is 0.2:1, and the molar ratio of -NCO:-OH is 1.1:1 ) The melt and the molten sulfur at about 150°C were sprayed slowly on the surface of the sulfur film from two different nozzles at the same time. By controlling their spraying flow ratio, the average mass of sulfur in the sulfur-containing polyurethane mixture film formed by spraying The fraction is 60%, and the m...

Embodiment 2

[0039] The granular industrial urea with a particle size of 2.0-4.0mm is added to the fluidized bed coating equipment, and the granular urea is in a boiling state, and the temperature of the granular urea in the fluidized bed is maintained at 85°C. Slowly spray molten sulfur at about 150°C on the surface of the granular urea, and spray until the quality of the formed sulfur film reaches 15% of the total mass of the final product composite sulfur-coated slow-release urea. Then, the mixture of 4,4-diphenylmethane diisocyanate MDI, polypropylene glycol (average molecular weight of 2000) and butylene glycol (polypropylene glycol: butylene glycol mass ratio 1:0.1, -NCO: -OH The molar ratio is 1.1:1) The melt and the molten sulfur at about 150°C are sprayed slowly on the surface of the sulfur film from two different nozzles at the same time; control their spraying flow ratio, the spraying flow of molten sulfur is the largest at the beginning, It gradually decreases to zero at the end, w...

Embodiment 3

[0041] Add granular industrial urea with a particle size of 2.0-4.0mm into a drum coating equipment with a temperature controlled at 95°C, and rotate the drum (rotational speed 40r / min) to make granular urea flow in the drum. Slowly spray molten sulfur at about 150°C on the surface of the granular urea, and spray until the quality of the formed sulfur film reaches 8% of the total mass of the final product composite sulfur-coated slow-release urea. Then, melt the mixture of CYD-115 epoxy resin prepolymer plasticized by dibutyl phthalate and mixed amine curing agent (the mass fraction of dibutyl phthalate is 15%) at 150°C The left and right molten sulfur are sprayed slowly on the surface of the sulfur film from two different nozzles at the same time; control their spraying flow ratio, the spraying flow of molten sulfur is the largest at the beginning, and gradually decreases to zero at the end, while CYD-115 The spray flow rate of the mixture melt of epoxy resin prepolymer and mixed...

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Abstract

This invention provides a sustained-release compound fertilizer with sulfur envelope. The compound fertilizer is composed of fertilizer core and an envelope. The envelope comprises a sulfur film layer as inner or middle layer, and a sulfur-containing thermosetting polymer film layer with average sulfur weight percentage of 20-90%. The thermosetting polymer is one or more of polyurethane, epoxy resin and unsaturated polyester. The sulfur film layer may contain release regulator. The envelope has a total average thickness of 20-90 mums, and the sulfur film layer has an average thickness of 5-70 mums. The compound fertilizer has such advantages as long release period, and higher reliability.

Description

1. Technical Field [0001] The invention relates to a coated slow-release fertilizer, in particular to a composite sulfur-coated slow-release fertilizer, which belongs to the field of fertilizer industry. 2. Background technology [0002] Slow-release fertilizers are the development direction of agricultural fertilizers. At present, the cost of slow-release fertilizers is relatively high, and low-cost slow-release fertilizers that can be widely used are the focus of research and development of slow-release fertilizers. [0003] Due to the low price of sulfur and the high barrier properties of sulfur to water and fertilizers, the coated slow-release fertilizer prepared by the composite coating of polymer and sulfur can have a longer release period, which is very important and promising. Widely used slow-release fertilizer. [0004] US6,338,746, etc. discloses a sulfur composite coated slow-release urea prepared by a composite coating of a polyurethane film layer and a sulfur film l...

Claims

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Application Information

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IPC IPC(8): C05G5/00
Inventor 应宗荣彭永才蔡熠
Owner NANJING UNIV OF SCI & TECH
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