Heavy polymer coated slow-release fertilizer with sulfide as bottom coat

A high molecular polymer and controlled-release fertilizer technology, applied in the form of fertilizers, fertilizer mixtures, urea compound fertilizers, etc., can solve the problems of unsatisfactory water blocking performance and unsatisfactory controlled-release performance, and achieve better controlled-release effects. The effect of high density and strong impact resistance

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

AI Technical Summary

Problems solved by technology

However, the diethylene glycol-triacetate polybasic acid and the diisooxyester polymer used in this invention form a film. Although the film has a certain toughness, the water blocking performance is not ideal, and moisture is easy to pass through. The film layer enters the SCU from the cracks in the sulfur film, causing its nutrients to dissolve rapidly, resulting in unsatisfactory controlled release performance

Method used

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  • Heavy polymer coated slow-release fertilizer with sulfide as bottom coat

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Put 85kg of large-grain urea with a diameter of 2-5mm into the drum (1), heat to 80-90°C, and then atomize the liquid sulfur preheated to the molten state (150-160°C) with compressed air ( Two-fluid nozzle) (2), sprayed on the surface of urea granules, this air atomizing nozzle can be sprayed at a rate of 50-80g per minute, directly all the liquid sulfur of 15kg is sprayed on the granules, and the obtained sulfur-coated urea (SCU ) Sulfur accounts for 15% of the total weight of the fertilizer. Then 0.9kg of modified epoxy resin, 0.1kg of curing agent and 0.05kg of diluent are mixed and stirred evenly, and then gradually added to the sulfur-coated urea particles (3). With the continuous rotation of the drum, the ring The oxygen resin component is evenly coated on the particle surface (4), and it can be cured to form a film in about 5 minutes. The polymer-coated controlled-release fertilizer (PSCU1) with sulfur as the base coat prepared in the above steps is then cooled ...

Embodiment 2

[0016] Obtain sulfur-coated urea (SCU) sample 100kg by the same step of embodiment 1, then after the polymethylene polyphenyl polyisocyanate of 0.6kg and vegetable oil solidifying agent 0.4kg stir and mix (4), add to temperature and be 75 (3) on the sulfur-coated particles at ℃, after the drum rotates for about 8 minutes, it can solidify and form a film. This process is repeated twice, and the resulting product is (PSCU2), then cooled, weighed, and packaged (5), (6 ). It can control the release of nutrients in water at 25°C for about 150 days.

Embodiment 3

[0018] Can be obtained by the same step of embodiment 1 and take sulfur as the polymer coating controlled release fertilizer (PSCU1) sample of primer, then, the polymethylene polyphenyl polyisocyanate of 0.9kg and curing agent vegetable oil 0.6kg, after stirring and mixing evenly (4), add to the PSCU1 granules (3), after the drum rotates at a constant speed for about 8 minutes, it can solidify and form a film on the surface of PSCU1, this process is repeated twice, and the obtained product is PSCU3, then Cooling, weighing, packaging (5), (6). It can control the release of nutrients in water at 25°C for about 270 days.

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Abstract

The invention relates to an enveloped controlled release fertilizer and method for preparation which consists of, preheating the urea particles to a predetermined temperature, spraying the molten liquid state sulfur to the urea particles, forming a layer of smooth and compact sulfur-coated urea, charging hot-curing resin component on the sulfur-coated urea for even distribution onto the urea particle surface and fast formation.

Description

(1) Technical field [0001] The invention belongs to the field of controlled-release fertilizer production, and relates to a controlled-release fertilizer which sprays sulfur and a polymer coating on the surface of urea or compound (mixed) fertilizer particles and a processing method thereof. (2) Background technology [0002] Spray a layer of sulfur film on the surface of urea or compound (mixed) fertilizer particles to slow down the dissolution and diffusion of fertilizer nutrients and sulfur elements to the outside of the film, so as to achieve the purpose of slow release and controlled release. The preparation method of coated slow-release fertilizer is widely used in field. However, this method has relatively large defects, such as: because the sulfur film is easily oxidized and brittle in the air, it is easy to fall off or break from the surface of urea or compound fertilizer particles during storage and use, and lose the slow-release function of the film. In addition,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C9/00C05G3/00C05G3/90C05G5/00
Inventor 张民董树亭杨越超史衍玺
Owner SHANDONG AGRICULTURAL UNIVERSITY
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