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Coated controlled-release fertilizer and preparation method thereof

A technology of coated controlled-release fertilizer and coating layer, which is applied in the chemical field and can solve problems such as poor uniformity of polyurethane, difficulty in controlling the reaction rate and degree between raw materials, and affecting the controlled-release performance of the film layer.

Active Publication Date: 2014-09-10
BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although researchers have done a lot of research on polyurethane-based in-situ reaction film-forming controlled-release fertilizers, there are still some difficulties in the preparation process: due to the difficulty in controlling the reaction rate and degree between raw materials, the uniformity of polyurethane The degree is relatively poor, resulting in a lot of defects in the film layer, which seriously affects the controlled release performance of the film layer. In order to prepare a reaction film-forming polyurethane coated controlled release fertilizer with good controlled release and low coating rate at the same time, there are still many problems. certain difficulty

Method used

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  • Coated controlled-release fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Weigh 1 kg of urea granules, place in a fluidized bed, and preheat to 85°C;

[0060] Add 0.96g of dried mesoporous molecular sieve SBA-15 with a pore structure with an average particle size of 1 μm (purchased from Nanjing Xianfeng Nano Material Technology Co., Ltd.) Be SKR-T5, relative molecular mass is 500), 0.024g catalyst dibutyltin dilaurate and 0.24g dewatering agent p-toluenesulfonyl isocyanate (purchased from German Bayer company, trade mark is Additive T1) in the heating kettle, The melting temperature is kept at 95°C, and the mesoporous molecular sieve is uniformly dispersed under the strong action of mechanical stirring to obtain A1 material;

[0061] Weigh 1.2g film-forming agent paraffin and 0.15g leveling agent organosilicon D4 (octamethylcyclotetrasiloxane, purchased from Dow Corning) and place in a heating kettle, and according to the molar ratio of [NCO] and [OH] Add 16g of MDI (purchased from Yantai Wanhua Polyurethane Co., Ltd.) at a ratio of 1.07:1, ...

Embodiment 2

[0071] Weigh 1 kg of urea granules, place in a drum, and preheat to 75°C;

[0072] Add 0.56g of dried mesoporous molecular sieve SBA-15 powder with an average particle size of 1 μm into a mixture containing 24g of polytetrahydrofuran diol (purchased from BASF, Germany, the brand is PolyTHF1000, and the relative molecular mass is 1000) and 0.018g organotin catalyst (dibutyltin diacetate: dibutyltin dilaurate mass ratio: 1:9) was melted in a heating kettle at a constant temperature of 90°C, and the mesoporous molecular sieve was evenly dispersed under the strong action of mechanical stirring , get A3 materials;

[0073] Weigh 2.2g film-forming agent microcrystalline wax, and add 18g liquefied MDI (purchased from Yantai Wanhua, model PMM-10) according to the molar ratio of [NCO] to [OH] of 1.21:1, and place it under heating Stir evenly in the kettle and melt at a constant temperature to 90°C to obtain material B3;

[0074] A3 material and B3 material are atomized and sprayed on...

Embodiment 3

[0078] Weigh 1kg of Sacofu compound fertilizer (N-P-K: 15-15-15), place it in a drum, and preheat it to 90°C;

[0079] Add 1.59g of dried mesoporous molecular sieve SBA-3 former powder with an average particle diameter of 500nm into 15g of polyethertriol and 20g of polyetherdiol (purchased from Jiangsu Zhongshan Chemical Industry Co., Ltd., the brands are N330 and N220, the relative molecular mass is respectively 3000 and 2000) and 0.012g catalyst stannous octoate heating kettle, melting constant temperature to 90 ℃, and make the mesoporous molecular sieve disperse evenly under the ultrasonic action, obtain A4 material;

[0080] Weigh 1.6g film-forming agent microcrystalline wax and 0.03g leveling agent silicone (purchased from German BYK Chemicals, brand name BYK-LPG7018), and according to the molar ratio of [NCO] to [OH] is 1.19:1 Proportionally add 15.7g polymethylene polyphenyl polyisocyanate (purchased from Bayer, Germany, brand name Desmodur44V20L), put it in a heating k...

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Abstract

The invention discloses a coated controlled-release fertilizer and a preparation method thereof. The coated fertilizer is composed of fertilizer particles and a polymer coating layer, wherein the polymer coating layer material is prepared from isocyanate, polyalcohol, a catalyst and a mesoporous molecular sieve; the mass of the mesoporous molecular sieve accounts for 0.05-10% of the mass of the polymer coating layer material; and the mesoporous molecular sieve is selected from at least one of a molecular sieve with a pore canal structure and molecular sieve initial powder with no pore canal structure. The coated controlled-release fertilizer provided by the invention achieves the purpose of improving the controlled-release performance of nutrients by means of the coating layer under the interaction of the mesoporous molecular sieve having nano confinement effect and a polyurethane matrix.

Description

technical field [0001] The invention belongs to the field of chemistry, in particular to the field of controlled-release fertilizers in the field of fertilizers, and more specifically to a coated controlled-release fertilizer and a preparation method thereof. Background technique [0002] Coated controlled-release fertilizer refers to a new type of fertilizer that can adjust the release rate and supply intensity of nutrients according to the nutrient demand characteristics of plants in different growth stages, so that the nutrient release mode can be synchronized with the law of crop fertilizer absorption. Its application not only improves the utilization of fertilizers efficiency, and reduce the environmental pollution caused by chemical fertilizers. [0003] At present, according to different preparation processes, coated controlled-release fertilizers are mainly divided into three types: organic solvent type, water type and in-situ reaction film-forming type. The organic...

Claims

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Application Information

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IPC IPC(8): C05G3/00C08G18/42C08G18/48C08G18/67C08G18/32C08G18/44C08G18/69
Inventor 李丽霞杨俊刚曹兵徐秋明刘宝存肖强李鸿雁倪小会衣文平杨宜斌
Owner BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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