Nitrogenous fertilizer coating type sustained-release chemical fertilizer

A chemical fertilizer and coating technology, applied in fertilization devices, fertilizer mixtures, agriculture, etc., can solve the problems of short release period of slow-release chemical fertilizers, high fertilizer penetration ability of amino resins, and no practical value, etc., achieving low cost and low cost , the effect of high resistance fertilizer

Inactive Publication Date: 2009-07-29
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Amino resin is a slow-release nitrogen fertilizer. The nitrogen-coated slow-release fertilizer can be produced by using amino resin coating, but the amino resin has a large fertilizer penetration ability, and the release period of the slow-release fertilizer made by using pure amino resin coating alone is too short. no real practical value

Method used

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  • Nitrogenous fertilizer coating type sustained-release chemical fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Expand the commercially available expandable graphite with an expandable ratio of 250 times at 800°C to make expanded graphite, then mix expanded graphite, urea and formaldehyde (urea:formaldehyde molar ratio is 1:1.6, expanded graphite:(urea+formaldehyde) mass The ratio is 3:97), and then react to generate the expanded graphite-urea-formaldehyde resin prepolymer composite coating aqueous solution.

[0032] Spherical industrial urea with a particle size of 2.5-3.5mm is added to the drum coating equipment, and the spherical urea is in a flowing state, and the temperature of the spherical urea in the drum is kept at 90°C. Slowly spray the expanded graphite-urea-formaldehyde resin prepolymer composite coated aqueous solution on the surface of the spherical urea until the quality of the formed expanded graphite-urea-formaldehyde resin composite film reaches 22% of the total mass of the finished nitrogen fertilizer coated slow-release urea (thickness is about 150 μm). Final...

Embodiment 2

[0034]Expand the commercially available expandable graphite with an expansion rate of 200 times at 800°C to make expanded graphite, and then mix the expanded graphite with melamine-formaldehyde resin prepolymer aqueous solution to form the expanded graphite-melamine-formaldehyde resin prepolymer composite coating Aqueous solution (mass ratio of expanded graphite:melamine-formaldehyde resin prepolymer is 1:9).

[0035] Spherical industrial urea with a particle size of 2.5-3.5mm is added to the drum coating equipment, and the spherical urea is in a flowing state, and the temperature of the spherical urea in the drum is kept at 90°C. The melamine-formaldehyde resin prepolymer aqueous solution is slowly sprayed on the surface of the spherical urea, until the quality of the formed melamine-formaldehyde resin film layer reaches 3% (thickness is about 20 μm) of the total mass of the finished nitrogen fertilizer coated slow-release urea. Then, spray the expanded graphite-melamine-form...

Embodiment 3

[0037] Expand the commercially available expandable graphite with an expandable ratio of 150 times at 800°C to make expanded graphite, then disperse the expanded graphite in ethanol and ultrasonically disperse it for 60 minutes to obtain expanded graphite flakes, and then combine the expanded graphite flakes with The aqueous solution of the urea-formaldehyde resin prepolymer is mixed to form an expanded graphite-urea-formaldehyde resin prepolymer composite coating aqueous solution (the mass ratio of expanded graphite:urea-formaldehyde resin prepolymer is 1:6).

[0038] Add spherical industrial urea with a particle size of 2.5 to 3.5mm into the drum coating equipment, and keep the spherical urea in a flowing state, and keep the temperature of the spherical urea in the drum at 65°C. The nitrocellulose solution (the solvent is a mixed solvent of ethanol, acetone and amyl acetate) is slowly sprayed on the surface of the spherical urea until the quality of the formed nitrocellulose ...

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Abstract

The invention discloses a nitrogenous fertilizer coated slow release fertilizer. The nitrogenous fertilizer coated slow release fertilizer consists of a fertilizer core and a fertilizer core external coating. The coating is an amino resin-expanded graphite compound film layer or a composite film layer of the amino resin-expanded graphite compound film layer with a degradable polymer film layer. The degradable polymer is preferably amino resin. The amino resin is urea resin and/or malamine resin. The coating also can be compounded with a sulfur film layer and/or a high permeability resistant organic film layer. The resin-expanded graphite compound film layer can be mixed with high permeability resistant organic substance. The mass fraction of expanded graphite in the resin-expanded graphite compound film layer is preferably within the range of 2 percent to 15 percent. The total thickness of the coating is more than or equal to 40mum; the thickness of the high permeability resistant organic film layer is preferably less than or equal to 20mum; and the thickness of the sulfur film layer is preferably less than or equal to 50mum. A (main) coating layer of the nitrogenous fertilizer coated slow release fertilizer is harmless to the environment and is the nutriment in the fertilizer, and the nitrogenous fertilizer coated slow release fertilizer has low cost and long release period.

Description

1. Technical field [0001] The invention relates to a coated slow-release chemical fertilizer, in particular to a nitrogen fertilizer coated slow-release chemical fertilizer, which belongs to the field of chemical fertilizer industry. 2. Background technology [0002] Slow-release chemical fertilizers meet the requirements of environmental protection and sustainable social development, and will become the mainstream of agricultural chemical fertilizers in the future and the development direction of agricultural chemical fertilizers in the world. However, most of the coatings of slow-release chemical fertilizer products cannot be degraded. For example, coatings such as epoxy resin, polyurethane, polyethylene, polypropylene, and polyvinyl chloride will remain in the soil and pollute the environment. In particular, most of the coatings are not fertilizers. Substances that are useless to crops. The development of fertilizer-encapsulated slow-release chemical fertilizers is a goo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/08C05G3/90
Inventor 应宗荣
Owner NANJING UNIV OF SCI & TECH
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