Modified epoxy resin coated slow-release fertilizer with spray coating urea as bottom coat

A technology of epoxy resin and controlled release fertilizer, which is applied in fertilizer forms, fertilizer mixtures, fertilization devices, etc., can solve the problems of difficult recovery of solvents, poor nutrient controlled release effect, poor toughness, etc., to achieve convenient transportation and storage, improve fertilizer Utilization rate, the effect of improving hardness

Active Publication Date: 2005-01-26
SHANDONG AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process can evenly spray the membrane material on the surface of fertilizer particles, it has high energy consumption, and it is difficult to fully recover the solvent, which is easy to cause pollution to the production workshop and the surrounding environment, and it is difficult to mass-produce by using the fluidized bed process
Therefore, the price of controlled-release fertilizer products produced by this process is often high, and it is difficult to promote and apply them in large areas in agriculture.
In addition, on September 11, 1996, the patent "Controlled Release Fertilizer Using Epoxy Polymer Primer Coating and Its Preparation Method" invented by Alice P. Hudson of American Lesco Company, in which the invention It has its disadvantages, such as: most epoxy polymers are cured with amine curing agent to form a film. During the processing and production process, it is easy to react with potassium ions and other salts in compound (mixed) fertilizers, releasing a large amount of ammonia gas On the one hand, it is difficult for the epoxy polymer to solidify on the surface of the fertilizer particles; on the other hand, the volatilization of ammonia will cause nitrogen loss and pollution to the working environment
Therefore, this patent is mainly used for the coating of urea, not suitable for the coating of compound (mixed) fertilizers
In addition, when epoxy polymer is used as a controlled release coating, its toughness is poor, it is easy to produce brittle cracks, and the controlled release effect on nutrients is poor.

Method used

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  • Modified epoxy resin coated slow-release fertilizer with spray coating urea as bottom coat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Add 5kg of urea into the fast melter (1), control the temperature at 120-130°C, after it is completely melted into urea liquid (2), spray it evenly on the preheated to 50°C with a two-fluid pressure nozzle 90kg of compound fertilizer granules (about 2-3mm in diameter) (3); then, gradually heat the fertilizer to about 90°C, and cure about 1.5kg of modified epoxy resin (E44 / PUR=95 / 5) About 0.15kg of agent T-593, about 0.05kg of diluent benzyl glycidyl ether 921, and 0.05kg of bentonite are mixed evenly, and then gradually added to the top of the fertilizer granules in the drum (4). The rotation speed of the drum is about 40 rpm. After about 8 minutes, the epoxy resin component can solidify and form a film on the surface of the fertilizer particles. This process is repeated 3 times. Finally, the fertilizer is cooled to room temperature by the cooler and can be packaged. storage (5). The obtained controlled-release fertilizer product has a controlled release of nutrients f...

Embodiment 2

[0015] Put 5kg of urea into the fast melter and convert it into urea liquid (2), spray evenly on 88kg of compound fertilizer granules that have been preheated to 50°C in the fluidized bed (3), and then transfer it into the drum , Add about 2.0kg of modified epoxy resin, about 0.3kg of curing agent T31, about 0.1kg of diluent AEG, and 0.02kg of bentonite according to step 1. The temperature required for curing is 86°C±2°C for about 5 minutes, and the adding process is repeated 3 times (4). The obtained product is packaged and stored after cooling (5). The obtained controlled-release fertilizer product can control the release time of nutrients for about 180 days under the condition of 25°C.

Embodiment 3

[0017] Put 5kg of urea into the fast melter and convert it into urea liquid (1), evenly spray it on 85kg of compound fertilizer particles preheated to 50°C in the fluidized bed (2), add modified epoxy resin (E44 / PUR=95 / 5) about 1.8kg, curing agent diethylenetriamine about 0.2kg, diluent tributyl phosphate about 0.02kg, diatomaceous earth 0.02kg, after mixing evenly, gradually add to the surface of the fertilizer particles in the drum Step (3) and (4), after about 7 minutes, it can solidify and form a film on the surface of the fertilizer. This process was repeated 5 times. Finally cooled to room temperature. It can be packaged and stored (5). The obtained controlled-release fertilizer product can control the release of nutrients for about 270 days at 25°C.

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Abstract

The invention discloses a coated slow-release fertilizer and its preparation method, which is characterized by that, a layer of urea is sprayed and coated onto the surface of the composite fertilizer particles as a bottom covering, so as to form a release control layer of modified epoxy resin, this process can increase the nitrogen element content in the fertilizer.

Description

(1) Technical field [0001] The invention relates to a film-coated controlled-release fertilizer which sprays urea melt on the surface of compound (mixed) fertilizer particles as a base coat and uses modified epoxy resin as a controlled-release coating and a preparation method thereof. (2) Background technology [0002] There are many problems in the chemical fertilizers currently used, such as: economic loss and environmental pollution caused by large-scale application of chemical fertilizers and low nutrient utilization efficiency. How to greatly improve the utilization rate of fertilizers and give full play to the role of chemical fertilizers is one of the most prominent problems in the development of sustainable and efficient agriculture. The invention and production of controlled-release fertilizers and their application in agriculture have opened up new ideas for solving this problem and more efficient ways. [0003] At present, the types of film-coated controlled-rele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C05G3/00C05G3/90C05G5/00
Inventor 杨越超张民
Owner SHANDONG AGRICULTURAL UNIVERSITY
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