Polymer composite coated slow release fertilizer

A slow-release fertilizer and polymer film technology, applied in the field of slow-release fertilizers and polymer composite-coated slow-release fertilizers, can solve the problems of low drying temperature at room temperature, easy to be damaged, and high process cost, and achieve low permeability , the effect of long release period

Inactive Publication Date: 2007-04-18
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

But, because the fusing point of paraffin is low, and the intensity of paraffin film layer is little, the paraffin film layer of formation is usually easily destroyed in the follow-up formation polyacrylate film layer process (comprising film coating and dry film-forming process), cannot be well Maintain a continuous film layer so that the release period of the film-coated slow-release urea composited with the film layer formed by the paraffin film layer and the polyacrylate emulsion is still very short
In addition, when the paraffin film layer is used for compounding, the normal temperature drying temperature is low when the subsequent polymer emulsion forms a film layer, and the film forming speed of the polymer emulsion is slow, or vacuum drying is required, so the process cost is high

Method used

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  • Polymer composite coated slow release fertilizer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 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 petroleum resin (flowing temperature is 105 DEG C) is melt-sprayed on the surface of the urea until the quality of the formed petroleum resin film reaches 4.5% of the total mass of the final product polymer composite film-coated slow-release urea. Then, the temperature of granular urea in the fluidized bed is raised to 95°C, and polystyrene emulsion is sprayed on the surface of the petroleum resin film until the quality of the formed polystyrene film reaches the total mass of the final polymer composite coated slow-release urea 16%. Gradually raise the temperature of the granular urea in the fluidized bed to 105°C, fully dry to remove the water in the film layer, and obtain the polymer composite coated slow-release urea. The release perio...

Embodiment 2

[0037] 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 95°C. Polyethylene wax (flowing temperature is 105 DEG C) is melt-sprayed on the surface of urea until the quality of the formed polyethylene wax film layer reaches 4% of the total mass of the final product polymer composite film-coated slow-release urea. Then, spray the polyethylene emulsion on the surface of the polyethylene wax film layer until the quality of the formed polyethylene film layer reaches 19% of the total mass of the final product polymer composite coated slow-release urea. Gradually raise the temperature of the granular urea in the fluidized bed to 105°C, fully dry to remove the water in the film layer, and obtain the polymer composite coated slow-release urea. The release period of the prepared polymer complex coated sustained-rele...

Embodiment 3

[0039] 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 75°C. Spray the butanone solution of high-impact polystyrene on the surface of granular urea until the formed high-impact polystyrene film reaches 3% of the total mass of the final polymer composite coated slow-release urea, fully dry and remove the film Butanone in the layer. Then, raise the temperature of granular urea in the fluidized bed to 95°C, and spray polystyrene emulsion on the surface of the high-impact polystyrene film until the formed polystyrene film reaches the total amount of polymer composite coated slow-release urea. 15% of the mass. Gradually raise the temperature of the granular urea in the fluidized bed to 105°C, fully dry to remove the water in the film layer, and obtain the polymer composite coated slow-release urea. The rel...

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Abstract

The present invention provides a kind of polymer composite coated type slow release granular fertilizer. Said fertilizer is formed from fertilizer core and its exterior coating layer, in which said coating layer includes: (a), high barrier polymer coating layer formed by adopting melt type and / or organic solution type polymer adhesive; and (b), polymer coating layer and / or sulfur-containing polymer mixture coating layer formed by adopting emulsion type polymer adhesive.

Description

1. Technical field [0001] The invention relates to a slow-release fertilizer, in particular to a polymer composite 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. Among them, the polymer-coated slow-release fertilizer can have excellent slow-release performance, and is the main type of slow-release fertilizer. [0003] Polymer-coated slow-release fertilizers can be coated with polymer solutions, emulsions or oligomer melts. For polymers that cannot be coated with oligomer melts, using their emulsions for coating is a relatively economical and environmentally friendly method compared to using their organic solutions for coating, so the use of polymer emulsions for coating preparation polymerization Bio-coated slow-release fertilizers can be an important class of coated slow-release fertilizers. [0004] But, when only carr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G5/00C05G3/00
Inventor 应宗荣应榜元董慧娟李静
Owner NANJING UNIV OF SCI & TECH
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