Method for producing filmÊöcoated controlled release fertilizer of degradable film prepared by reclaiming thermoplastic resin

A technology of plastic resin and controlled-release fertilizer, applied in fertilizer forms, inorganic fertilizers, fertilizer mixtures, etc., can solve the problems of high production cost and sales price of coated fertilizers, difficult field crops to popularize and apply, and high cost of controlled-release fertilizers. Significant yield and synergistic effects, excellent quality and results, low cost results

Active Publication Date: 2006-05-24
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thermosetting resin-coated controlled-release fertilizers are mainly represented by "Osmocote" produced by Scotts in the United States. The coating material is alkyd resin or polyurethane polymer. This resin-coated fertilizer has good controlled-release performance. But this resin is expensive, so the cost of producing controlled-release fertilizers is too high to be widely used on field crops
Controlled-release fertilizers coated with thermoplastic resins are represented by "Meister" and "Nutricote" produced by Japan's Chisso-Asahi Fertilizer Company. The coating materials are mainly polyethylene and ethylene vinyl acetate copolymer (EVA) according to a certain ratio Mixed and dissolved in an organic solvent, and then sprayed on the fertilizer particles in a fluidized bed coating tower to form a film. This coated fertilizer also has the function of nutrient controlled release, but the price of this resin is expensive, causing the coating The production cost and sales price of film fertilizer are high. In addition, the residual film after the fertilizer dissolves takes a long time to degrade in the soil.

Method used

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  • Method for producing filmÊöcoated controlled release fertilizer of degradable film prepared by reclaiming thermoplastic resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Put 100kg of granular compound fertilizer with a diameter of 2-5mm into the fluidized bed, heat to 60-80°C, mix 3.0kg of recycled polyethylene plastic film and 3.0kg of recycled polystyrene foam in 50kg of dichloromethane and Add 0.5kg of diatomaceous earth, corn flour and rubber powder to the mixed solvent of tetrachlorethylene each accounting for 1 / 2, heat to 90-100°C, use a two-fluid nozzle to atomize the air at an air pressure of 4kpa at a rate of 2kg per minute Progress spraying, spray all 100kg of solution onto the fertilizer granules. The obtained controlled release compound fertilizer, the polymer film accounts for about 6% of the total weight of the fertilizer, and the controlled release time of the nutrient is about 6 months when the fertilizer is placed in water or soil at 25°C.

Embodiment 2

[0012] Put 200kg of urea with a diameter of 2-4mm into the fluidized fluidized bed, heat it to 50-70°C, mix 4kg of recycled polyethylene plastic film and 6kg of recycled polystyrene foam into 100kg of tetrachlorethylene and dichloromethane Add 1.0kg of light calcium carbonate powder, wheat flour and rubber powder to 1 / 2 of the mixed solvent, heat to 80-90°C, spray on the large area with a two-fluid nozzle at an atomization pressure of 4kpa at a speed of 2kg per minute On granular urea, the obtained controlled-release fertilizer film accounts for about 5% of the total weight of all controlled-release fertilizers. This fertilizer is in 25 ℃ water or soil, and the nutrient release time is about 3 months.

Embodiment 3

[0014] Put 100kg of granular potassium sulfate with a diameter of 2-5mm into the fluidized fluidized bed, heat it to 70-80°C, mix 3kg of recycled polyethylene and 2kg of recycled polystyrene in 40kg of tetrafluoroethylene and methylene chloride at a ratio of 2 : 0.5 kg of 400 mesh talcum powder, sweet potato powder and rubber powder were added in the mixed solvent of 1. Heating to 100°C, using a dual-fluid nozzle to spray on the fertilizer particles at an atomization pressure of 4kpa at a rate of 2kg per minute, the resulting controlled-release potassium fertilizer, the film accounts for about 5% of the total weight of the fertilizer, in water or soil at 25°C In , the nutrient controlled release time is about 4 months.

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Abstract

The invention relates to a film-coated controlled-release fertilizer which uses recycled waste thermoplastic resin, adds various fillers, is suitable for rapid and large-scale industrial production, and adopts a heating fluidized bed film-coating process and a production method thereof. The invention is to mix the recovered polystyrene foam resin and polyethylene film resin according to the set ratio, add a certain proportion of mineral powder, grain powder and rubber powder to dissolve in the mixed solvent of tetrachlorethylene and dichloromethane , in the heated fluidized bed, it is evenly sprayed on the pre-heated compound fertilizer, urea, potassium sulfate and other fertilizer particles through a two-fluid nozzle to form a smooth and dense polymer coating with different water permeability, and the solvent is condensed through a special Compression recycling equipment for recycling. This product not only has precise nutrient controlled release performance, the nutrient controlled release period can be controlled from 1 month to 12 months, and the membrane shell remaining in the soil can be degraded in a short period of time, which belongs to the degradable membrane shell Environmentally friendly controlled release fertilizer.

Description

(1) Technical field [0001] The invention belongs to the field of controlled-release fertilizer production and relates to spraying recycled plastic solution on the surface of compound (mixed) fertilizers or urea granules to form a thermoplastic resin coating, and reclaiming and reusing the solvent as a coated controlled-release fertilizer and a processing method thereof. (2) Background technology [0002] At present, the types of film-coated controlled-release fertilizers at home and abroad mainly include polymer-coated fertilizers and inorganic-coated fertilizers. Inorganic coated fertilizers are represented by sulfur-coated urea (SCU) (US3295950) developed by TVA Corporation of the United States. Although the production cost is not high, it is difficult to strictly control the release rate and time of its nutrients. Since the sulfur film is easily oxidized and brittle in the air, the film shell will rupture during the nutrient release process, resulting in the sudden releas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G5/00C05G3/00C05G1/00C05C9/00C05D1/00
Inventor 张民杨越超万连步
Owner SHANDONG AGRICULTURAL UNIVERSITY
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