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Coated controlled-release fertilizer modified by natural polymer and preparation method thereof

A technology for controlled-release fertilizers and fertilizers, which is applied to the field of natural polymer-modified coated fertilizers and their preparation, can solve the problems of high production cost, difficulty in long-term sustainable development, white pollution, etc., and achieves improved distribution uniformity, Recyclable solvent and mild reaction conditions

Active Publication Date: 2011-12-28
大项生态建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The common disadvantages of organic polymer coated fertilizers are: 1. The production cost is high, and the applicable crop area is narrow. It is only suitable for crops with high added value such as horticultural crops, golf courses, and ornamental plants. Environmental pollution and other issues are not helpful; 2. The coating material is not biodegradable, and it is easy to cause "white pollution" after long-term use; 3. Relying on non-renewable resources such as petroleum, it is difficult for long-term sustainable development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1) Weigh 55.4g carboxymethylcellulose (purchased from Sinopharm Chemical Reagent Beijing Branch, product code 68004180), dissolve in 2000mL distilled water to obtain an aqueous solution of carboxymethylcellulose; then weigh 34.6g crosslinking agent N , N-methylenebisacrylamide and 0.02g catalyst ammonium cerium nitrate are miscible in 200mL distilled water to obtain an aqueous solution of crosslinking agent N, N-methylenebisacrylamide and catalyst cerium ammonium nitrate, and the above two aqueous solutions are mixed Evenly, to obtain the coating solution a;

[0048] In addition, 10 g of film-forming aid paraffin and 10 g of film-forming aid turpentine were dissolved in 200 mL of ethyl acetate to obtain coating solution b;

[0049] 2) Weigh 1 kg of large-grain urea with a particle diameter of 3 mm, place it in a fluidized bed, turn on the air induction switch of the fluidized bed and heat it to preheat the large-grain urea to 75 ° C, and then adjust the air induction fr...

Embodiment 2

[0054] 1) Weigh 76g of microcrystalline cellulose with an average degree of polymerization of 350-7000 (purchased from Sinopharm Chemical Reagent Beijing Branch, product code 68005882), and dissolve it in 1500mL solvent anhydrous N-methylmorpholine-N-oxide ( Purchased from Shanghai Heyi Chemical Co., Ltd., product code 72) to obtain N-methylmorpholine-N-oxide solution of microcrystalline cellulose. In addition, 45.6 g of the cross-linking agent epichlorohydrin was dissolved in 500 mL of xylene to obtain a xylene solution of the cross-linking agent epichlorohydrin. Mix the above two solutions to obtain the coating solution a;

[0055] In addition, 10 g of film-forming aid paraffin was weighed and dissolved in 200 mL of ethyl acetate to obtain coating solution b;

[0056]2) Weigh 1 kg of large-grain urea with a particle diameter of 5 mm, place it in the drum of the drum device, turn on the blower and adjust the frequency of the centrifugal fan to 38 Hz to make the fertilizer pa...

Embodiment 3

[0061] 1) Weigh 76g of softwood pulp (purchased from Beijing Qiandao Technology Co., Ltd.) with an average degree of polymerization of 350-7000, 15g of crosslinking agent glutaraldehyde and crosslinking agent melamine formaldehyde resin (purchased from Beijing Taixing Jiahe Trading Co., Ltd., Product code MF-40, viscosity average molecular weight 3000-5000) 15g, miscible in 2000mL solvent distilled water, then add catalyst p-toluenesulfonic acid 0.02g and mix well to obtain coating liquid a;

[0062] Weigh 20g of film-forming aid sulfur and dissolve in 200mL of solvent carbon tetrachloride to obtain coating solution b;

[0063] 2) Weigh 1 kg of large urea particles with a particle diameter of 3mm, place it in a fluidized bed, turn on the air induction switch of the fluidized bed and heat to preheat the fertilizer particles to 80°C, and then adjust the air induction frequency of the centrifugal fan to 35Hz to make After the fertilizer granules are in a fluidized state, the coat...

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Abstract

The invention discloses a natural polymer modified coated controlled release fertilizer and a preparation method thereof. The fertilizer comprises a fertilizer core layer and a coated layer positioned on the outside of the fertilizer core, wherein the material of the fertilizer core layer is formed from fertilizer particles, and the coated layer which is one layer or two layers and is a two layered coated controlled release fertilizer is a cellulose layer and a hydrophobic film. The coated controlled release fertilizer provided by the invention has a good controlled release performance, and simultaneously the film material has biodegradability, so an environmental problem brought by the controlled release film material is solved. A natural product cellulose is adopted to get rid of the dependence of the coated material on a petrochemical resource, so the sustainable development of the coated material is realized. The coated controlled release fertilizer, which has the advantages of improvement of the fertilizer utilization rate, environment pollution reduction, sustainable development, and the like, has a wide application prospect.

Description

technical field [0001] The invention relates to a coated fertilizer and a production method thereof, in particular to a natural polymer modified coated fertilizer and a preparation method thereof. Background technique [0002] Fertilizer is one of the most important means of production in agricultural production and the material basis for crop growth. The replacement of farmyard manure by chemical fertilizers has played a huge role in the rapid development of agriculture, animal husbandry, and aquaculture, and also provided a solid material guarantee for the development of human society. my country is a big agricultural country, and a large amount of fertilizer is used every year. As the population surges and the arable land decreases, the contradiction between food supply and demand has intensified, resulting in excessive reliance on fertilizers in agricultural production and excessive use of fertilizers. Most of the chemical fertilizers currently used in our country are ...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/08C05G3/90
CPCY02P60/21
Inventor 胡树文邱小云陶树明任雪芹
Owner 大项生态建设有限公司
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