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Preparation method of double-membrane multifunctional controlled release fertilizer

A slow and controlled release fertilizer, multi-functional technology, applied in the direction of nitrogen fertilizer, fertilization device, urea compound fertilizer, etc., can solve problems such as violation, environmental pollution, nitrogen fertilizer nitrification, etc., achieve high success rate, improve soil water holding capacity, and strong water retention Effect

Inactive Publication Date: 2017-11-24
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, a large number of coating materials on the market are chemically synthesized substances, which have polluted the environment and violated the original intention of green chemistry, and have not inhibited the nitrification of nitrogen fertilizers and the hydrolysis of urea. Therefore, it is urgent to develop a green multi- Functional coated slow-release fertilizer

Method used

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  • Preparation method of double-membrane multifunctional controlled release fertilizer
  • Preparation method of double-membrane multifunctional controlled release fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Prepare the inner capsule:

[0035] Under room temperature, stir with a stirrer to dissolve 5 g of ethyl cellulose in 100 g of ethanol, then add 0.0125 g of polyvinylpyrrolidone, and stir for 1 hour to obtain 105 kg of ethyl cellulose inner coating solution.

[0036] 2. Preparation of outer film material:

[0037] At room temperature, take 5g of high water-retaining adsorption resin, add it to 2.5kg of dicyandiamide aqueous solution with a concentration of 0.05g / L, then place it in a constant temperature oscillator for dynamic adsorption, take the solid phase, dry it, and pulverize it to obtain powdered adsorption Dicyandiamide mass percentage of 1% high water retention adsorption type outer coating material.

[0038] 3. Coating process:

[0039] Weigh 100g of compound fertilizer granules with a particle size of 2-6mm (the compound fertilizer is composed of nitrogen fertilizer, phosphate fertilizer and potassium fertilizer), spray 8.4g of ethyl cellulose inner coat...

Embodiment 2

[0042] 1. Prepare the inner capsule:

[0043] Under room temperature, stir with a stirrer to dissolve 5 g of ethyl cellulose in 150 g of ethanol, then add 0.025 g of polyethylene glycol, and stir for 1 hour to obtain 155 kg of ethyl cellulose inner coating solution.

[0044] 2. Preparation of outer film material:

[0045] At room temperature, take 5g of high water-retaining adsorption resin, add 2.5kg of thiourea aqueous solution with a concentration of 0.2g / L, and then place it in a constant temperature oscillator for dynamic adsorption, take the solid phase, dry it, and pulverize it to obtain powdery adsorbed sulfur High water retention adsorption type outer coating material with urea mass percentage of 4%.

[0046] 3. Coating process:

[0047]Weigh 100g of urea granules with a particle size of 2-6mm, spray 37.2g of ethyl cellulose inner coating solution on the fertilizer granules, and after the ethanol volatilizes, take a sample and measure the mass of the inner coating t...

Embodiment 3

[0050] 1. Prepare the inner capsule:

[0051] At room temperature, stir with a stirrer to dissolve 5 g of ethyl cellulose in 120 g of ethanol, then add 0.005 g of polyvinylpyrrolidone, and stir for 1 hour to obtain 125 kg of ethyl cellulose inner coating solution.

[0052] 2. Preparation of outer film material:

[0053] At room temperature, take 5g of high water retention adsorption resin, add it to 5kg of thiourea aqueous solution with a concentration of 0.05g / L, and then place it in a constant temperature oscillator for dynamic adsorption, take the solid phase, dry it, and pulverize it to obtain powdery adsorbed thiourea The mass percentage is 2% high water retention adsorption type outer coating material.

[0054] 3. Coating process:

[0055] Weigh 100g of urea granules with a particle size of 2-6mm, spray 12.5g of ethyl cellulose inner coating solution on the fertilizer granules, and after the ethanol volatilizes, take a sample and measure that the inner coating quality ...

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Abstract

The invention relates to a preparation method of a double-membrane multifunctional controlled release fertilizer and belongs to the technical field of fertilizer production. The preparation method comprises the following steps: spraying ethyecellulose internal coated film liquid to the surfaces of fertilizer cores, so as to obtain single-membrane fertilizer particles after ethanol volatilizes; spraying a glutaraldehyde solution to the outer sides of the single-membrane fertilizer particles, and spraying an inhibitor-adsorbed high-water-retention adsorption type external coated film material, so as to obtain the double-membrane multifunctional controlled release fertilizer. The internal coated film and the external coated film are made from a cellulose-base material, so that the preparation method is environment-friendly; by utilizing an inhibitor, an antihydrolysis effect is achieved while the fertilizer is slowly released, the nitration and decomposition of effective components are inhibited, and the utilization rate of the fertilizer is increased; and meanwhile, high-water-retention adsorption type resin is an external coated film, so that the water absorption amount of a fertilizer product can be effectively improved, the water-retaining property is strong, the water-holding capacity of soil is increased, and the fertilizer is suitable for being applied in easily-arid regions with changeable climate.

Description

technical field [0001] The invention belongs to the technical field of fertilizer production. Background technique [0002] With the rapid development of the chemical industry, fertilizers, as one of the primary technologies for agricultural development, have been widely adopted by countries all over the world, and have achieved remarkable results in increasing production. However, the seasonal utilization rate of chemical fertilizers used in my country is relatively low. The loss of a large amount of fertilizer not only causes huge economic losses, but also causes serious environmental pollution. Therefore, as long as we follow the law of nutrient cycle and ecological balance in the ecosystem, improve fertilization technology and fertilizer preparation process, develop new fertilizers, develop high-efficiency and long-lasting fertilizers, and truly apply chemical fertilizers reasonably, these negative effects can be minimized, thereby Realize the sustainable development o...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/08C08F251/02C05G3/90
CPCC05C9/00C05G1/00C05G3/00C05G3/90C05G5/37C08F251/02
Inventor 杨继生张满鲜
Owner YANGZHOU UNIV
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