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Coated particulate preparation method

A particle and coating technology, which is applied in fertilizer mixtures, agriculture, fertilization devices, etc., can solve the problems of reduced fertilizer resistance, high energy consumption in the coating process, and reduced mechanical strength of the coating.

Inactive Publication Date: 2009-12-09
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of these lead to more defects in the coating, which reduces the mechanical strength of the entire coating and reduces the ability to resist fertilizers. Therefore, the amount of coating required for slow-release fertilizers increases, and the energy consumption of the coating process is higher.
In other words, the current preparation method suffers from low coating efficiency, poor coating integrity and poor coating handling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] The preparation method of coated particles of the present invention comprises the following steps in turn:

[0033] In the first step, when the particles are in a moving state, coat the coating solution on the surface of the particles and gradually solidify to form a film, and control the coating speed and curing speed so that the particles do not coalesce under the coating curing operating conditions adopted. , until the coating outside the particle reaches the designed coating volume, and at this time, the coating liquid coated on the outer layer of the coating is the coating liquid that forms the organic polymer film layer;

[0034] The second step is to solidify the organic polymer film layer of the outer layer of the coating when the particles are in motion. Liquid inert organic matter under certain conditions to form a continuous organic inert liquid film outside the organic polymer film layer;

[0035] In the third step, under the physical isolation protection o...

Embodiment 1

[0092] Add spherical industrial urea with a particle size of 2.0 to 4.0mm into the drum coating equipment, and rotate the drum coating equipment (rotating speed 50r / min) to keep the spherical urea in motion. The temperature of the spherical urea is kept at 90°C. Spray dioctyl phthalate plasticized polystyrene toluene solution (the mass ratio of dioctyl phthalate:polystyrene is 1:9) on the surface of urea granules and gradually solidify to form a film, and control the coating speed , so that the urea particles do not coalesce, and spray until a plasticized polystyrene film layer of 1.5% of the total mass of the final product coated urea particles can be formed. Then, spray the polyvinyl alcohol-modified urea-formaldehyde resin prepolymer aqueous solution containing amine chloride 1% (the polyvinyl alcohol-modified urea-formaldehyde resin prepolymer aqueous solution is urea, formaldehyde, polyvinyl alcohol) on the plasticized polystyrene film layer surface Prepared by the reacti...

Embodiment 2

[0094] Add spherical industrial urea with a particle size of 2.0 to 4.0mm into the drum coating equipment, and rotate the drum coating equipment (rotating speed 50r / min) to keep the spherical urea in motion. The temperature of the spherical urea is kept at 90°C. Spray an aqueous solution of urea-formaldehyde resin prepolymer containing 1.5% of amine chloride (urea-formaldehyde resin prepolymer is prepared by reacting urea and formaldehyde with a urea:formaldehyde molar ratio of 1:1.8) on the surface of urea granules to gradually solidify and form a film, and control coating Coating speed, so that the urea particles do not coalesce, spray until a urea-formaldehyde resin film layer with a total mass of 17% of the final product-coated urea particles can be formed. Then, the urea-formaldehyde resin film layer on the surface of the urea granules is solidified until the urea granules are about to coalesce, and 1.5% of the total mass of the finished product coated urea granules is add...

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PUM

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Abstract

The invention discloses a coated particulate preparation method, comprising the following steps: firstly, particulates in movement are coated with coating solution to cure the solution to form films; the coating rate and curing rate are controlled to ensure that the particulates reach the designed coating quantity while avoiding accumulation; then, the organic polymer films outside the coating films of particulates in movement are cured; inert organic substance is added to form continuous inert liquid membranes outside the organic polymer films before the particulates are likely to accumulate on the adopted coating film curing process conditions; then, the organic polymer films outside the particulates are continuously cured to lose autohension or so that the whole coating films are cured fully; and finally, the particulates coated films are cooled to the room temperature to obtain the coated particulates. The preparation method of the invention has high coating efficiency and good coating integrity and coating process.

Description

1. Technical field [0001] The invention relates to a method for preparing coated granules, in particular to a method for preparing coated fertilizer granules, which belongs to the field of chemical fertilizer industry and related industries. 2. Background technology [0002] Slow-release chemical fertilizers have become the key to greatly improving the utilization rate of chemical fertilizers and developing sustainable and efficient agriculture. [0003] Coated slow-release fertilizers are the main type of slow-release fertilizers. Coated slow-release fertilizers mainly include sulfur-coated slow-release fertilizers and resin-coated slow-release fertilizers. Sulfur-coated slow-release fertilizers are coated with a sulfur film on the surface of the fertilizer, and then coated with an organic polymer film and / or a low-molecular-weight organic film; resin-coated slow-release fertilizers are manufactured with an organic polymer film (Low molecular weight organic matter film la...

Claims

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Application Information

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IPC IPC(8): C05G3/00
Inventor 应宗荣阎蕊杨天颖戚裕
Owner NANJING UNIV OF SCI & TECH
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