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.
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[0032] The preparation method of the coated particulate matter of the present invention sequentially includes the following steps:
[0033] In the first step, when the particles are in motion, coat the coating liquid 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 adopted coating curing operating conditions , Until the coating outside the particles reaches the designed coating volume, and 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 while the particles are in motion. Before the particles are coalesced under the used coating curing operation conditions, add in the used coating curing operation An inert organic substance that is liquid under conditions to form a continuous organic iner...
Example Embodiment
[0091] Example 1
[0092] The spherical industrial urea with a particle size of 2.0-4.0mm is added to the drum coating equipment, and the drum coating equipment is rotated (rotating speed 50r / min) to keep the spherical urea in motion, and the temperature of the spherical urea is kept at 90°C. Spray the dioctyl phthalate plasticized polystyrene toluene solution (the mass ratio of dioctyl phthalate: polystyrene is 1:9) on the surface of the urea particles and gradually solidify into 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 an aqueous solution of polyvinyl alcohol-modified urea-formaldehyde resin prepolymer containing 1% of amine chloride on the surface of the plasticized polystyrene film (the aqueous solution of polyvinyl alcohol-modified urea-formaldehyde resin prepolymer is urea, formaldehyde...
Example Embodiment
[0093] Example 2
[0094] The spherical industrial urea with a particle size of 2.0-4.0mm is added to the drum coating equipment, and the drum coating equipment is rotated (rotating speed 50r / min) to keep the spherical urea in motion, and the temperature of the spherical urea is kept at 90°C. A urea-formaldehyde resin prepolymer aqueous solution 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) is sprayed on the surface of the urea particles to gradually solidify into a film, and control the coating The coating speed is such that the urea particles do not coalesce, and the spraying can form a urea-formaldehyde resin film layer of 17% of the total mass of the final product coated urea particles. Then, the urea-formaldehyde resin film layer on the surface of the urea particles is cured until the urea particles are about to coalesce, and 1.5% of the total mass of the final...
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