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A method for recycling and utilizing polyurethane film-forming controlled-release fertilizer resin residual film

A technology of controlled-release fertilizers and reaction film formation, which is applied in application, fertilizer mixtures, fertilization devices, etc., can solve the impact of nutrient release performance of unexplained coated controlled-release fertilizers, does not involve resin scarring reuse, does not give Problems such as the secondary utilization method of scarring and residual film have been solved to achieve the effect of reducing environmental pollution and reducing the cost of film materials

Active Publication Date: 2018-03-13
中国-阿拉伯化肥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Invention patent CN 200580041048.6 In the production process of polyurethane reaction film-forming controlled-release urea, the introduction of a "plough"-like component near the nozzle in the drum significantly reduces the scarring on the inner wall of the drum and correspondingly reduces the consumption of membrane materials, but the inventor There is no secondary utilization method for the scarred residual film
[0008] Invention patent WO 2004 / 011395 improves the wear resistance and impact resistance of coated controlled-release fertilizers by introducing granular fillers such as mineral powder, sulfur, grain powder, and urea dust into the polyurethane coating layer, but does not involve resin bonding. The reuse of scars, and the influence of the presence or absence of granular fillers on the nutrient release performance of coated controlled-release fertilizers has not been explained.

Method used

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  • A method for recycling and utilizing polyurethane film-forming controlled-release fertilizer resin residual film
  • A method for recycling and utilizing polyurethane film-forming controlled-release fertilizer resin residual film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for recycling polyurethane film-forming controlled-release fertilizer resin residual film, the steps are as follows:

[0038] (1) Recycling of Resin Residual Film Fine Powder

[0039] Collect the scars on the inner wall of the coating drum and the copying plate of the polyurethane reaction film-forming controlled-release urea production line, coarsely crush it through a 2mm sieve through a universal crusher, and then use the XQM-2L type produced by Nanjing Keyan Experimental Instrument Research Institute The ball mill uses water as the medium to carry out wet ball milling, stops after 6 hours, takes out the residual film, washes it with water 2-3 times, and puts it in an oven to dry, and finally becomes a uniform and loose fine powder of resin residual film. Measured by particle size analyzer, the average particle size is 28 μm.

[0040] (2) Utilization of resin residual film fine powder

[0041] 3.5% by mass (3.5% refers to the ratio of residual film to the ...

Embodiment 2

[0049] A method for recycling polyurethane film-forming controlled-release fertilizer resin residual film, the steps are as follows:

[0050] (1) Recycling of Resin Residual Film Fine Powder

[0051] Collect the scars on the inner wall of the coating drum and the copying plate of the polyurethane reaction film-forming controlled-release urea production line, coarsely crush it through a 2mm sieve through a universal crusher, and then use the XQM-2L type produced by Nanjing Keyan Experimental Instrument Research Institute The ball mill uses water as the medium to carry out wet ball milling, stops after 6 hours, takes out the residual film, washes it with water 2-3 times, and puts it in an oven to dry, and finally becomes a uniform and loose fine powder of resin residual film. Measured by particle size analyzer, the average particle size is 28 μm.

[0052] (2) Utilization of resin residual film fine powder

[0053] 3.5% by mass resin residual film filler polyurethane coated ure...

Embodiment 3

[0059] A method for recycling polyurethane film-forming controlled-release fertilizer resin residual film, the steps are as follows:

[0060] (1) Recycling of Resin Residual Film Fine Powder

[0061] Collect the scars on the inner wall of the coating drum and the copying plate of the polyurethane reaction film-forming controlled-release urea production line, coarsely crush it through a 2mm sieve through a universal crusher, and then use the XQM-2L type produced by Nanjing Keyan Experimental Instrument Research Institute The ball mill uses water as the medium to carry out wet ball milling, stops after 6 hours, takes out the residual film, washes it with water 2-3 times, and puts it in an oven to dry, and finally becomes a uniform and loose fine powder of resin residual film. Measured by particle size analyzer, the average particle size is 28 μm.

[0062] (2) Utilization of resin residual film fine powder

[0063] 12% residual film filler polyurethane coated urea

[0064] Add...

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Abstract

The invention relates to a method for recycling a resin film residue of a polyurethane reaction film-forming controlled-release fertilizer. The method comprises the following steps of: (1) recovery: levigating, rinsing and drying a resin film residue waste obtained in the production process of the polyurethane reaction film-forming controlled-release fertilizer to obtain fine resin film residue powder; (2) utilization: adding the obtained fine resin film residue powder as a filler to a polyhydric alcohol raw material with 2-6 hydroxy groups, sufficiently mixing uniformly, and solidifying to form one of film components of the polyurethane reaction film-forming controlled-release fertilizer. The method disclosed by the invention can not only be used for solving the problem of recycling of the resin film residue obtained in the production process of the polyurethane reaction film-forming controlled-release fertilizer, reducing the film material cost and reducing the environmental pollution, but also be free of generating negative effects on the controlled-release property of the polyurethane reaction film-forming controlled-release fertilizer.

Description

technical field [0001] The invention relates to the recycling of polyurethane reaction film-forming controlled-release fertilizer resin residual film, in particular to a method for recycling polyurethane reaction film-forming controlled-release fertilizer resin residual film. Background technique [0002] Coated controlled-release fertilizers can be divided into thermosetting resin coating and thermoplastic resin coating according to the different coating materials. Among them, thermosetting resin coating has been widely promoted and applied because it does not involve solvent recovery and is easy to realize continuous production. Its typical representative is polyurethane reaction film-forming controlled-release fertilizer. [0003] In the production process of polyurethane-coated controlled-release fertilizers, while the resin is solidified on the surface of the fertilizer particles, it will also adhere to the side wall of the drum, the lifting board, and the nozzle, and b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C05G3/08C05G3/90
Inventor 茹铁军吴舒王金铭石学勇贲艳英郭岩佟艳娟
Owner 中国-阿拉伯化肥有限公司
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