Environmentally degraded enveloped slow release chemical fertilizer

A chemical fertilizer and coating technology, applied in fertilization devices, fertilizer mixtures, agriculture, etc., can solve the problems of poor slow-release performance and short release period, and achieve the effect of long release period and good slow-release performance

Inactive Publication Date: 2010-11-10
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, coated fertilizers completely coated with environmentally degradable polymers, such as amino resins, acetal resins of polyvinyl alcohol and their copolymers, and natural polymers and their derivatives, often release Short period, poor sustained release performance

Method used

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  • Environmentally degraded enveloped slow release chemical fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Spherical industrial urea with a particle size of 2.0-4.0mm is added to the drum coating equipment with a temperature control of 95°C, and the drum is rotated (rotating speed 70r / min) to make the spherical urea flow in the drum. Slowly spray the polystyrene (Lanzhou Petrochemical Company B-1) toluene solution containing dioctyl phthalate (dioctyl phthalate: polystyrene mass ratio is 1:9) on the surface of spherical urea, Spraying until the quality of the formed dioctyl phthalate plasticized polystyrene film layer reaches 3% of the total mass of the final product environmentally degradable coated slow-release urea. Then, continue to spray low-density polyethylene containing cornstarch (Yangzi Petrochemical-BASF Co., Ltd. BYC-01) toluene solution (cornstarch: low-density polyethylene mass ratio is 1: 4), spray until the cornstarch that forms is low The quality of the density polyethylene film layer reaches 17% of the total mass of the final product environmental degradati...

Embodiment 2

[0027] Spherical industrial urea with a particle size of 2.0-4.0mm is added to the drum coating equipment with a temperature control of 95°C, and the drum is rotated (rotating speed 70r / min) to make the spherical urea flow in the drum. Slowly spray low-density polyethylene (Yangzi Petrochemical-BASF Co., Ltd. BYC-01) toluene solution on the surface of spherical urea until the quality of the formed low-density polyethylene film layer reaches the final environmental degradation coating type slow-release urea. 2% of mass. Then, continue to spray corn-containing cross-linked starch (corn starch is cross-linked and modified with glyoxal, and the consumption of glyoxal and catalyst magnesium chloride is respectively 12% and 5% of the corn starch quality, in water at 115°C Reaction 30min) and polyvinyl chloride (Qingdao Haijing Chemical Group Co., Ltd. HS-1300) cyclohexanone solution (corn cross-linked starch: dioctyl phthalate: polyvinyl chloride mass ratio of dioctyl phthalate) 7:...

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Abstract

The invention discloses an environmentally degraded enveloped slow release chemical fertilizer, which comprises a chemical fertilizer core and a chemical fertilizer core envelop. The envelop is a composite film formed by a film A and a film B, wherein the film A is a polymer film of a polar natural polymer and a derivative thereof with the mass fraction not smaller than 20 percent, the film B is a high-permeability resistance organic film of a polar natural polymer and a derivative thereof with the mass fraction smaller than 20 percent, the mass fraction of the polar natural polymer and the derivative thereof in the film A is preferably 25-50 percent, and the mass fraction of the polar natural polymer and the derivative thereof in the film B is preferably zero. In the envelop of the environmentally degraded enveloped slow release chemical fertilizer, the aggregate thickness of the film A is preferably 3 times or more of the aggregate thickness of the film B, the aggregate thickness of the envelop is preferably 22-200 mu m, the aggregate thickness of the film A is preferably 20-180 mu m, and the aggregate thickness of the film B is preferably 2-30 mu m. The envelope of the slow release fertilizer is partially environmentally degradable and has longer release period.

Description

1. Technical field [0001] The invention relates to a slow-release chemical fertilizer, in particular to an environmentally degradable coated slow-release chemical fertilizer, which belongs to the field of chemical fertilizer industry. 2. Background technology [0002] At present, the chemical fertilizers used in the agricultural field are basically instant chemical fertilizers, and the effective utilization rate is only 30%-40%. The waste of chemical fertilizers is very alarming. Coating chemical fertilizers with coating materials to make coated fertilizers, and using coatings to release chemical fertilizers slowly is the most important and effective method to improve the utilization rate of chemical fertilizers. Coated fertilizers are currently the most important agricultural fertilizers in the world. research and development focus. [0003] Coated slow-release chemical fertilizers coated with environmentally degradable materials meet the requirements of environmental prot...

Claims

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Application Information

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