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Slow release urea

A slow-release, urea technology, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of preventing the effective release of urea, low nitrogen utilization, and inability to achieve slow release of urea, avoiding urea agglomeration and preventing rainwater. drain effect

Inactive Publication Date: 2015-02-18
LIUZHOU TIANZI HORTICULTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Urea is currently the nitrogen fertilizer with the highest nitrogen content. As a neutral fertilizer, it is suitable for various soils and plants. It is the most widely used nitrogen fertilizer variety. However, because urea is easily soluble in water and easy to decompose, the nitrogen utilization rate is low.
Existing slow-release urea generally uses semi-permeable or impermeable coating materials to wrap granular urea or add inhibitors to urea. However, these methods still have some problems. Although the coating materials can reduce the dissolution of urea, However, the existence of the film also prevents the effective release of urea, and after the film falls off, the urea is re-exposed to the environment and cannot achieve the effect of sustained release. Although the addition of inhibitors can effectively inhibit the ammoniation process of urea, the existing inhibition The price of the agent is very expensive, and it cannot prevent the loss of urea caused by rainwater leaching

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Add 200g of acrylic acid monomer into a 1L beaker, then add 500g of water, 1.5g of crosslinking agent pentaerythritol triallyl ether and 0.2g of potassium persulfate in sequence, raise the temperature to 80°C, and react for 3 hours to obtain a prepolymer. The prepolymer was adjusted to neutrality with sodium hydroxide, and then 200 g of urea was added, stirred and matured at room temperature for 3 hours to obtain a gel-like resin, which was granulated and dried to obtain slow-release urea.

Embodiment 2

[0012] Add 200g of acrylic acid monomer into a 1L beaker, then add 2000g of water, 1.0g of crosslinking agent pentaerythritol triallyl ether and 0.24g of potassium persulfate in sequence, raise the temperature to 75°C, and react for 3.5 hours to obtain a prepolymer. The prepolymer was adjusted to neutrality with sodium hydroxide, and then 1000 g of urea was added, stirred and matured at room temperature for 2 hours to obtain a gel-like resin, which was granulated and dried to obtain slow-release urea.

Embodiment 3

[0014] Add 100g of acrylic acid monomer into a 1L beaker, then add 1000g of water, 0.3g of crosslinking agent pentaerythritol triallyl ether and 0.18g of potassium persulfate in sequence, raise the temperature to 85°C, and react for 3 hours to obtain a prepolymer. The prepolymer was adjusted to neutrality with sodium hydroxide, and then 1500 g of urea was added, stirred and matured at room temperature for 3 hours to obtain a gel-like resin, which was granulated and dried to obtain slow-release urea.

[0015] How to use: Soak the slow-release urea in water, and bury it in the root of the plant after it reaches the saturation of water absorption. The water absorption of slow-release urea can reach 250-350g / g, and the gel strength can reach 170-200g / cm 2 After 1 month, the water retention capacity still reaches 120-200g / g. After absorbing water, because the acrylic resin has good strength and water retention, the urea can slowly precipitate out along with the water in the acrylic...

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Abstract

The invention discloses slow release urea. The urea comprises urea and acrylic resin particles, wherein urea is dispersed in the acrylic resin particles. The slow release urea can prevent the urea from being washed away by rainwater to run off, and at the same time, the slow release urea also has the effects of control of the slow release of the urea and water retention.

Description

technical field [0001] The present invention relates to a slow-release urea. Background technique [0002] Urea is currently the nitrogen fertilizer with the highest nitrogen content. As a neutral fertilizer, it is suitable for various soils and plants. It is the most widely used nitrogen fertilizer variety. However, because urea is easily soluble in water and easy to decompose, the nitrogen utilization rate is low. . Existing slow-release urea generally uses semi-permeable or impermeable coating materials to wrap granular urea or add inhibitors to urea. However, these methods still have some problems. Although the coating materials can reduce the dissolution of urea, However, the existence of the film also prevents the effective release of urea, and after the film falls off, the urea is re-exposed to the environment and cannot achieve the effect of sustained release. Although the addition of inhibitors can effectively inhibit the ammoniation process of urea, the existing i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05G3/90
Inventor 陈财宝
Owner LIUZHOU TIANZI HORTICULTURE
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