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Double-layer coated precise controllable slow-release fertilizer and preparation method thereof

A double-layer coating, controlled and slow-release technology, which is applied in the direction of layered/coated fertilizers, inorganic fertilizers, fertilizer mixtures, etc., can solve the problems of difficult control of the slow-controlled release period, and reduce the dependence on the uniformity of the film layer , easy large-scale application, the effect of reducing production equipment requirements

Inactive Publication Date: 2020-10-27
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Aiming at the problem that it is difficult to control the slow and controlled release cycle of precise and controllable slow-release fertilizers, the first purpose of the present invention is to disclose a preparation method of double-layer coated precise and controllable slow-release fertilizers

Method used

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  • Double-layer coated precise controllable slow-release fertilizer and preparation method thereof

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Effect test

Embodiment 1

[0035] (1) Mix potassium chloride, urea, and calcium phosphate fertilizer according to the ratio of 1:1:1 and prefabricate them evenly into particles with a particle size of about 3mm; put them into fluidized bed coating equipment, preheat at 55°C for 12 minutes, and put The polyacrylic acid emulsion water-absorbing resin emulsion is sprayed on the surface of the fertilizer and dried, and by controlling the amount of the polyacrylic acid emulsion water-absorbing resin emulsion, a water-absorbing resin-coated fertilizer with a thickness of 95-150 μm is obtained;

[0036] (2) Dissolve the recovered polystyrene foam and toluene at a mass ratio of 1:5 to form a bonding solution, then add silica sol, calcium-based bentonite, and monoglyceride to emulsify at high speed to obtain a hydrophobic resin coating solution; The mass concentration is 15%, and the addition amount is 80% of the binding liquid; the calcium-based bentonite addition is 10% of the binding liquid mass, and the monog...

Embodiment 2

[0038] (1) Mix potassium chloride, urea, and calcium phosphate fertilizer according to the ratio of 1:1:1 and prefabricate them evenly into particles with a particle size of about 3mm; put them into fluidized bed coating equipment, preheat at 55°C for 12 minutes, and put The polyacrylic acid emulsion water-absorbing resin emulsion is sprayed on the surface of the fertilizer, and dried, and by controlling the amount of the polyacrylic acid emulsion water-absorbing resin emulsion, a water-absorbing resin-coated fertilizer with a thickness of 300-400 μm is obtained;

[0039] (2) Dissolve the recovered polystyrene foam and toluene at a mass ratio of 1:5 to form a bonding solution, then add silica sol, calcium-based bentonite, and monoglyceride to emulsify at high speed to obtain a hydrophobic resin coating solution; The mass concentration is 15%, and the addition amount is 80% of the binding liquid; the calcium-based bentonite addition is 10% of the binding liquid mass, and the mon...

Embodiment 3

[0041] (1) Mix potassium chloride, urea, and calcium phosphate fertilizer according to the ratio of 1:1:1 and prefabricate them evenly into particles with a particle size of about 3mm; put them into fluidized bed coating equipment, preheat at 55°C for 12 minutes, and put The polyacrylic acid emulsion water-absorbing resin emulsion is sprayed on the surface of the fertilizer, and dried, and by controlling the amount of the polyacrylic acid emulsion water-absorbing resin emulsion, a water-absorbing resin-coated fertilizer with a thickness of 200-300 μm is obtained;

[0042] (2) Dissolve the recovered polystyrene foam and toluene at a mass ratio of 1:5 to form a bonding solution, then add silica sol, calcium-based bentonite, and monoglyceride to emulsify at high speed to obtain a hydrophobic resin coating solution; The mass concentration is 15%, and the addition amount is 80% of the binding liquid; the calcium-based bentonite addition is 10% of the binding liquid mass, and the mon...

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Abstract

The invention belongs to the technical field of slow-release fertilizers, and particularly relates to a double-layer coated precise controllable slow-release fertilizer and a preparation method thereof. The preparation method of the double-layer coated precise controllable slow-release fertilizer comprises the following steps of: filling fertilizer particles into fluidized bed coating equipment, spraying a water-absorbent resin emulsion on the surface of the fertilizer, and performing drying to obtain a water-absorbent resin coated fertilizer; spraying a hydrophobic resin coating liquid on thesurface of the fertilizer to obtain a double-layer film coated fertilizer on the surface of the water-absorbent resin coated fertilizer; and the preparation method of the hydrophobic resin coating liquid comprises the following steps of: dissolving recycled polystyrene foam and toluene in a mass ratio of 1:5 to form a bonding liquid, then adding silica sol, calcium bentonite and monostearin, andperforming stirring and emulsifying at a high speed to obtain the hydrophobic resin coating liquid. According to the invention, the slow / controlled-release period of the fertilizer can be effectivelycontrolled, so that the dependence of the slow / controlled-release fertilizer on the film uniformity is reduced. The process is simple, production equipment requirements are reduced, and the product percent of pass is high.

Description

technical field [0001] The invention belongs to the technical field of slow-release fertilizers, and in particular relates to a double-coated, precise and controllable slow-release fertilizer and a preparation method thereof. Background technique [0002] Most of the slow-release fertilizers currently used in agriculture are only conceptual in nature, and it is difficult to achieve the described effect in the actual fertilization process. Either the effect of the coating material is not good, and the fertilizer is released immediately to achieve the effect of non-slow release, or the coating material is too large. Thickness prevents the fertilizer from being released throughout the season, which further affects the growth of crops. The production of good-quality slow-release fertilizers requires a complete coating without defects, which can achieve a controllable effect and increase the cost of fertilizers, making it difficult to achieve large-scale promotion and application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/40C05G5/30
CPCC05B7/00C05G3/40C05G5/30C05G5/37C05C9/00C05D1/02
Inventor 陈庆陈巧和司文彬陈涛白涛
Owner CHENDU NEW KELI CHEM SCI CO LTD
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