A polyurethane-coated controlled-release fertilizer with improved mechanical properties and its preparation method and special coating material

A technology for controlled-release fertilizers and coating materials, applied in polyurea/polyurethane coatings, fertilizer mixtures, applications, etc., can solve the problems of poor water resistance of the film layer, problems with the stability of the film layer, etc., and achieve resistance to mechanical damage. The effect of improved properties, elasticity and toughness

Active Publication Date: 2012-02-22
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For polyurethane film coating technology, in order to improve the physical properties of the film layer, especially the impact resistance, Canadian Agrium company patent WO 2004 / 011395 introduced inorganic or organic fine powder into the polyurethane film layer, such as urea dust, phosphate rock powder, etc. , but the introduction of this external additive actually acts as a pore opening agent, which will inevitably make the water blocking performance of the film layer worse
In 2006, the company applied for the patent WO 2007 / 016788, which introduced epoxidized soybean oil into the polyurethane film material, and believed that it can significantly improve the impact resistance of film coating (the film layer accounts for less than 3.0% of the fertilizer) Performance effect, but the stability of this technology film layer in the soil may be problematic

Method used

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  • A polyurethane-coated controlled-release fertilizer with improved mechanical properties and its preparation method and special coating material
  • A polyurethane-coated controlled-release fertilizer with improved mechanical properties and its preparation method and special coating material
  • A polyurethane-coated controlled-release fertilizer with improved mechanical properties and its preparation method and special coating material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1. Preparation of polyurethane coated fertilizer using MDI prepolymer

[0029] Weigh 0.75kg of 2.00-4.75mm large granular urea produced by China Overseas Chemical Company and put it into a stainless steel drum with a diameter of 26cm and 4 uniformly distributed 1.5cm high herringbone copy plates. Adjust the drum speed to make the urea in good condition. The state of flow. While rotating, use an electric heater to preheat it to 76-82℃ and keep it warm. 4.60g castor oil containing 70# microcrystalline wax (wherein, the mass percentage of 70# microcrystalline wax is 8.2%) and 2.42g preheated to 100°C

[0030] MDI prepolymer (manufactured by DOW, with a functionality of 2, [NCO] content of 23%) is rapidly coated on the surface of urea at the same time. After 6-7 minutes, apply the same second layer. Then coat the third and fourth layers in sequence. After the coating solution of the fourth layer is cured, the urea is kept for 3-5 minutes to facilitate the maturation ...

Embodiment 2

[0033] Example 2: Preparation of polyurethane-coated fertilizer using MDI prepolymer

[0034] Weigh 1.0kg of 2.00-4.75mm 15-15-15 potassium sulfate type compound fertilizer produced by China-Arab Fertilizer Company, and put it into a stainless steel drum with a diameter of 26cm and 4 uniformly distributed 1.5cm high herringbone copy plates. Adjust the rotating speed of the drum to make the compound fertilizer in a good flowing state. While rotating, use an electric heater to preheat it to 80-85°C and keep it warm. 4.60g castor oil containing C30+α olefin (wherein, the mass percentage of C30+α olefin is 5.0%) preheated to 100°C and 2.48g MDI prepolymer (manufactured by DOW, with a functionality of 2, [NCO] content is 18.6%) at the same time quickly spread on the surface of the compound fertilizer. After 6-7 minutes, apply the same second layer. Then coat the 3rd, 4th and 5th layers in sequence. After the coating solution of the fourth layer is solidified, the fertilizer is kep...

Embodiment 3

[0035] Example 3. Preparation of polyurethane coated fertilizer using MDI prepolymer

[0036] Weigh 1.0 kg of 2.00-4.75mm 15-15-15 potassium sulfate type compound fertilizer produced by China-Arab Fertilizer Company, and put it into a stainless steel drum with a diameter of 26cm and 4 uniformly distributed 1.5cm high herringbone copy plates, and adjust The rotating speed of the drum makes the compound fertilizer in a good flowing state. While rotating, use an electric heater to preheat it to 80-85°C and keep it warm. Heat the castor oil mixture containing 70# microcrystalline wax and dehydroacetic acid (wherein, the mass percentage of 70# microcrystalline wax is 5.0% and the mass percentage of dehydroacetic acid is 1.0%) on an electric furnace to 100 ℃ preheated to 100 ℃ 4.60g castor oil containing 70# microcrystalline wax (wherein, the mass percentage of 70# microcrystalline wax is 5.0%) and 2.48g MDI prepolymer (manufactured by DOW company, functionality is 2. [NCO] content i...

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Abstract

The invention discloses a polyurethane-coated controlled-release fertilizer, a preparation method thereof and a special coating material. The coating material is composed of modified isocyanate, polyol and additives; wherein, the molar ratio [OH]: [NCO] of the hydroxyl group in the polyol to the isocyanate in the modified isocyanate is 1: 0.8-2.0, so The polyol is an alcohol containing 2-6 hydroxyl groups, and its molecular weight is 60-3000Da; the additive is a lubricant and / or a toughening agent; the addition of the additive is the mass of the modified isocyanate and polyol 0.1%-20%. The coated controlled-release fertilizer provided by the present invention consists of a core and a nuclear membrane, wherein the core is a granular fertilizer, the nuclear membrane is made of the coating material, and the quality of the nuclear membrane is the 1.0%-10% of core mass. The use of the coating material of the invention to prepare the polyurethane coating can improve the elasticity and toughness of the polyurethane film layer, and correspondingly improve the mechanical damage resistance of the coated fertilizer.

Description

Technical field [0001] The invention relates to a coated controlled-release fertilizer and a preparation method thereof, in particular to a polyurethane coated controlled-release fertilizer with improved mechanical properties, a preparation method and a special coating material. Background technique [0002] Fertilizers, especially chemical fertilizers, are a source of nutrients necessary for crop growth. [0003] In recent years, slow and controlled release fertilizers that can release nutrients slowly have been developed rapidly, including urease inhibitor type (ZL 99113382.X), urea formaldehyde type, insoluble matter-coated type (CN 85 1 01008, US 3342577), resin coated Membrane type (CN 89101193.5, US 4657576) and so on. Through the adoption of the above technology, the proper and uniform supply of crop fertilizer nutrients is ensured, while the loss of nutrients is reduced and the environment is protected. Among the above-mentioned technical categories, coated slow-release f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/81C08G18/78C08G18/67C08G18/32C08G18/66C09D175/04C05G3/00
Inventor 茹铁军王金铭郑秀兴李青山王国喜
Owner CHINA NAT OFFSHORE OIL CORP
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