Environmental protection composite envelope type slow release fertilizer

A slow-release fertilizer and coating technology, which is applied in the field of coated slow-release fertilizers and environmentally friendly composite coated slow-release fertilizers, can solve the problem of degradable materials with high water and fertilizer penetration rates, and degradable coated slow-release fertilizers. Short release period, etc., to achieve the effect of low cost, high barrier property and long release period

Inactive Publication Date: 2007-09-12
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the water and fertilizer permeability of degradable materials are very high, so the release period of the prepared degradable coated slow-release fertilizer is very short, generally only a few days, such as the coated slow-release fertilizer coated with urea-formaldehyde resin Coated slow-release fertilizers coated with fertilizers and lignin modifiers

Method used

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  • Environmental protection composite envelope type slow release fertilizer
  • Environmental protection composite envelope type slow release fertilizer
  • Environmental protection composite envelope type slow release fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Add granular industrial urea with a particle size of 2.0 to 4.0mm into the fluidized bed coating equipment, and keep the granular urea in a boiling state, and keep the temperature of the granular urea in the fluidized bed at 80°C. The aqueous solution of urea-formaldehyde resin prepolymer (urea-formaldehyde resin prepolymer is prepared by reacting urea and formaldehyde with a urea:formaldehyde molar ratio of 1:2) and molten sulfur at about 150°C are sent from two groups of different nozzles to the surface of granular urea at the same time. Slowly spray, by controlling their spraying flow ratio, make the average mass fraction of sulfur in the formed thiourea-formaldehyde resin mixture film layer be 70%, spray until the quality of the formed layer of thiourea-formaldehyde resin mixture film layer reaches the final product environmental protection 6% of the total mass of composite-coated slow-release urea is dried to remove water contained in the film layer. Then, stop spr...

Embodiment 2

[0054] Add granular industrial urea with a particle size of 2.0 to 4.0mm into the fluidized bed coating equipment, and keep the granular urea in a boiling state, and keep the temperature of the granular urea in the fluidized bed at 90°C. Slowly spray molten sulfur at about 150°C on the surface of urea until the quality of the sulfur film reaches 7% of the total mass of the final product, environmentally friendly composite coated slow-release urea. Then, spray the sulfur-containing melamine-formaldehyde resin prepolymer aqueous solution (melamine-formaldehyde resin prepolymer is melamine: the melamine of formaldehyde mol ratio is 1: 3 is prepared by the reaction of melamine and formaldehyde containing sulfur at the surface of the sulfur film layer, sulfur: melamine- The mass ratio of the formaldehyde resin prepolymer is 7: 3), until the quality of the formed sulfur-containing melamine-formaldehyde resin mixture film layer reaches 8% of the total mass of the final product environ...

Embodiment 3

[0056] Add granular industrial urea with a particle size of 2.0 to 4.0mm into the fluidized bed coating equipment, and keep the granular urea in a boiling state, and keep the temperature of the granular urea in the fluidized bed at 90°C. The aqueous solution of melamine-formaldehyde resin prepolymer (melamine-formaldehyde resin prepolymer is prepared by the reaction of melamine and formaldehyde with a mol ratio of melamine: formaldehyde of 1:4) is sprayed on the surface of urea until the layer of melamine-formaldehyde resin film formed The quality of the layer reaches 2% of the total mass of the final product environmental protection composite film-coated slow-release urea, and the water in the film layer is removed by drying. Then, slowly spray molten sulfur at a temperature of about 150° C. on the surface of the melamine-formaldehyde resin film until the quality of the formed sulfur film reaches 11% of the total mass of the final finished environmentally friendly composite co...

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Abstract

This invention discloses an environmental protection compound envelope-type slow released fertilizer composed of a core and an envelope out of the core, in which, the envelope contains a sulfur film layer, a degradable polymer mixed film layer containing sulfur and / or degradable polymer film layer with or without a high barrier organic film layer, in which, the sulfur film layer is the inner or a mid layer of the envelope, the degradable polymer can be one or more than one of amido resin, polythene alcohol and its multipolymer acetal resin, unsaturated oil resin, a natural polymer and its derivant, the high barrier organic film is better to be a non-polarized organic film, the material may be a non-polarized low molecular weight organics or a non-polarized polymer and the non-polarized organic film layer of 0-15mum thick is better to close the sulfur film layer.

Description

1. Technical field [0001] The invention relates to a film-coated slow-release fertilizer, in particular to an environment-friendly composite film-coated slow-release fertilizer, which belongs to the field of fertilizer industry. 2. Background technology [0002] At present, slow-release fertilizer is the development direction of the world's fertilizer industry. Among them, coated slow-release fertilizers are the focus of the development of slow-release fertilizers, but the coating of non-degradable coated slow-release fertilizers left in the environment will pollute the environment. Therefore, it is necessary to develop environmentally friendly coatings with degradable coatings Type slow-release fertilizers meet the requirements of environmental protection and social sustainable development, and will become the mainstream of slow-release fertilizers in the future. [0003] However, the water and fertilizer permeability of degradable materials are very high, so the release p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/08C05G5/00C05G3/90
Inventor 应宗荣
Owner NANJING UNIV OF SCI & TECH
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