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Water retention type sustained release nitrogen fertilizer and preparation method thereof

A water-retaining, nitrogen-based fertilizer technology, applied in nitrogen fertilizers, fertilization devices, urea compound fertilizers, etc., can solve the problems of insufficient utilization of biomass resources, limited water-absorbing and water-retaining effects of water-retaining agents, and difficulty in exerting water-retaining effects, etc., and achieve good application value and market prospects, strong water retention capacity, and good nutrient slow-release performance

Inactive Publication Date: 2018-12-04
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese Patent Publication No. CN106431505A discloses a kind of potassium diurea phosphate prepared from potassium dihydrogen phosphate solution and industrial urea as raw material, acrylic acid and sodium acrylate as reaction monomers, and N,N'-methylenebis Acrylamide is used as a crosslinking agent, and ammonium persulfate is used as an initiator to prepare water-retaining and slow-release nitrogen and potassium fertilizers through graft polymerization at 0°C and nitrogen protection. However, the price of raw materials such as acrylic acid and sodium acrylate is relatively high, which increases production costs. and does not make full use of waste biomass resources
Chinese Patent Publication No. CN102557811A discloses a method for preparing a water-retaining slow-release fertilizer by mixing and granulating fertilizers with water-retaining substances, and then coating them. However, since the water-retaining substances are in the film, it is difficult to Play the role of water retention, and the process is more complicated and the cost is higher
CN102826917A slow-release water-retaining high-nitrogen fertilizer and its preparation method and CN105272773A urea-formaldehyde slow-release fertilizer bar and its preparation method add water-retaining agent to improve water-retaining efficiency, but the water-absorbing and water-retaining effect of the water-retaining agent is affected by high salt content The uniformity and water absorption and water retention effect of the prepared fertilizer need to be further improved

Method used

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  • Water retention type sustained release nitrogen fertilizer and preparation method thereof
  • Water retention type sustained release nitrogen fertilizer and preparation method thereof
  • Water retention type sustained release nitrogen fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A preparation method of chemically synthesized water-retaining slow-release nitrogen fertilizer, the preparation method comprising:

[0041] Weigh 20g of shrimp and crab shells as powder and place them in a 500ml beaker, add 1.5mol / L HCl solution and soak for 24h, stirring continuously until no bubbles are generated. Pour off the acid solution, wash with water until neutral; use 2.0mol / L NaOH solution in a 100°C water bath to stir continuously for 4 hours, and hydrolyze to remove the protein. Pour off the NaOH solution, wash with water until neutral, and obtain crude chitin. Crude chitin with 5g / L of KMnO 4 The solution was soaked for 1h, filtered, washed with water to remove KMnO 4 Then use 10g / L oxalic acid solution at 60°C for decolorization reaction, stirring continuously until all become white, washing with water until neutral, drying, drying and pulverizing to obtain white chitin for later use.

[0042] Add 5.0g of chitin powder, 10.0g of citric acid and 10.0g ...

Embodiment 2

[0044] A preparation method of chemically synthesized water-retaining slow-release nitrogen fertilizer, the preparation method comprising:

[0045] Weigh 20g of shrimp and crab shells as powder and place them in a 500ml beaker, add 2.0mol / L HCl solution and soak for 10h, stirring continuously until no bubbles are generated. Pour off the acid solution, wash with water until neutral; use 4.0mol / L NaOH solution in a 100°C water bath to stir continuously for 7 hours, and hydrolyze to remove the protein in the shrimp shell. Pour off the NaOH solution, wash with water until neutral, and obtain crude chitin. Crude chitin with 0.05mol / L of KMnO 4 The solution was soaked for 1 hour, and then decolorized with 0.2 mol / L oxalic acid solution at 60°C, stirring continuously until it turned white, washed with water until neutral, dried, dried and pulverized to obtain white chitin for later use.

[0046] Add 5.0g of chitin powder, 15.0g of citric acid and 15.0g of industrial urea powder in ...

Embodiment 3

[0049] A preparation method of chemically synthesized water-retaining slow-release nitrogen fertilizer, the preparation method comprising:

[0050] Add 8.0g of chitin powder obtained in Example 2, 20.0g of citric acid and 20.0g of industrial urea powder into a 1L three-necked flask, add 400ml of deionized water, stir at room temperature for 10min until the mixture is uniform, and the pH is 6; Drive out the air in the three-necked flask, heat it in a water bath after opening the condensing reflux device, gradually increase the temperature in the flask to 100°C at a heating rate of 5°C / min, and stir and react at 100°C for 450 minutes; take out the three-necked flask and place it for 10 hours After cooling to room temperature, the gel-like substance in the three-neck flask is washed repeatedly with 95% ethanol solution, and the gel-like substance is taken out, dried and pulverized to obtain a water-retaining slow-release nitrogen fertilizer. The nitrogen content of the water-reta...

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Abstract

The invention discloses a chemically synthesized water retention type sustained release nitrogen fertilizer and a preparation method thereof. The preparation method comprises following steps: (1) processing waste biomass, which is rich in chitin, such as shrimp shells, crab shells, and the like, to remove calcium and proteins so as to prepare chitin; and (2) under the protection of nitrogen, evenly mixing chitin, critic acid, and urea, carrying out reactions for 450 to 700 minutes in a water bath with a constant temperature of 100 DEG C, cooling obtained gel like substances, washing the gel like substances by ethanol, and finally carrying out vacuum drying and grinding to obtain the water retention type sustained release nitrogen fertilizer with molecular chains, which contain a large amount of hydrophilic groups such as -NH2, -COOH, and the like. When the molecular chains are broken off, the nitrogen of the molecular chains is released, and the sustained release function is realized.Waste biomass is fully utilized, the dependence on petrochemical products is reduced, the technical process and used equipment are simple, the cost is low, and the application value and market prospect are good.

Description

technical field [0001] The invention belongs to the technical field of slow-release and controlled-release fertilizers, in particular to a chemically synthesized water-retaining slow-release nitrogen fertilizer and a preparation method thereof. Background technique [0002] There are two major problems in my country's agricultural production: poor and uneven distribution of water resources, prominent contradiction between supply and demand of agricultural water; excessive fertilizer consumption and low nutrient utilization rate. With the increasing shortage of agricultural water resources and the decline of fertilizer utilization rate caused by unreasonable fertilization, it has become the key to the development of efficient ecological agriculture in my country to simultaneously achieve high and stable crop yields and efficient use of water and fertilizer through integrated regulation of water and fertilizer. [0003] Water retaining agents can improve water use efficiency, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08C05C9/00
CPCC05C9/00C08B37/003Y02P60/21
Inventor 田晓飞翟胜张保华张怀珍孙树臣程帅于泉洲
Owner LIAOCHENG UNIV