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Urea formaldehyde slow-release compound fertilizer and preparation method thereof

A slow-release technology for compound fertilizers and urea-formaldehyde, which is applied in the direction of urea compound fertilizers, inorganic fertilizers, fertilizer mixtures, etc., and can solve problems such as no slow-release effect

Inactive Publication Date: 2020-01-03
山东和生海洋科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] Aiming at the problem that the traditional urea-formaldehyde slow-release compound fertilizer only has a slow-release effect for a single nitrogen element during use, but other nutrients such as phosphorus, potassium and other elements have no slow-release effect, the present invention provides a nitrogen, phosphorus, potassium, magnesium Urea-formaldehyde slow-release compound fertilizer with slow-release effect and preparation method thereof

Method used

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  • Urea formaldehyde slow-release compound fertilizer and preparation method thereof
  • Urea formaldehyde slow-release compound fertilizer and preparation method thereof
  • Urea formaldehyde slow-release compound fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] n(U) / n(F)=1.3:1, and the molar ratio of basic magnesium compound to urea is 1.3:10.

[0106] 1. Addition reaction: Add 1200L of deionized water and 300kg of urea into the reaction kettle, stir, add 27.6kg of magnesium oxide after the urea dissolves, the pH value of the solution is 10.3, then slowly add 35.8kg of concentrated sulfuric acid dropwise, and then add 312kg of formaldehyde solution, The measured pH was 8.5, and the reaction was carried out at 30°C-40°C for 1 hour;

[0107] 2. Condensation reaction: After the addition reaction is over, add 75.0kg of phosphoric acid, the measured pH is 2.5, heat up to 60°C, and react for 1.5h;

[0108] 3. Terminate the condensation reaction: add potassium hydroxide aqueous solution with a concentration of 15.8% (dissolved potassium hydroxide in 5 times of water), adjust the pH value to 8.5, and react at 60°C for 0.5h;

[0109]4. Vacuumize and dehydrate the reactant to obtain a viscous slurry material, send it into a box dryer, ...

Embodiment 2

[0122] n(U) / n(F)=1.4:1, the amount of formaldehyde added was 289.6kg, the reaction temperature of the condensation reaction and the termination condensation reaction were both 55°C, and the other conditions were the same as in Example 1. The pH of the addition reaction is 8.5, and the pH of the condensation reaction is 2.8 to obtain 564.0 kg of urea-formaldehyde slow-release compound fertilizer.

[0123] The measurement result of embodiment 2 is shown in table 3:

[0124] table 3

[0125]

Embodiment 3

[0127] n(U) / n(F)=1.5:1, the amount of formaldehyde added was 270.3kg, and other conditions were the same as in Example 1. The pH of the addition reaction is 8.6, and the pH of the condensation reaction is 3.0 to obtain 563.3 kg of urea-formaldehyde slow-release compound fertilizer.

[0128] The measurement result of embodiment 3 is shown in table 4:

[0129] Table 4

[0130]

[0131] In this embodiment, the AI ​​reaches 62.5%, and the nitrogen release characteristic of the fertilizer is better.

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Abstract

The invention discloses a urea formaldehyde slow-release compound fertilizer and a preparation method thereof, belonging to the technical field of fertilizer preparation. According to a technical scheme, the urea formaldehyde slow-release compound fertilizer is prepared from the following raw materials: urea, formaldehyde, an alkaline magnesium compound, sulfuric acid, phosphoric acid, potassium hydroxide and deionized water, wherein a molar ratio of the urea to the formaldehyde is (1.3-1.6): 1; a molar ratio of the alkaline magnesium compound to the urea is (1.3-1.5): 10; a molar ratio of thealkaline magnesium compound to the phosphoric acid to the sulfuric acid is 1: 1: 0.55; and a mass ratio of the urea to the deionized water is 1: (4-6). The urea formaldehyde slow-release compound fertilizer disclosed by the invention has a slow-release effect on nitrogen, phosphorus, potassium and magnesium, and can provide comprehensive nutrients for the whole growth cycle of crops.

Description

technical field [0001] The invention relates to the technical field of fertilizer production, in particular to a urea-formaldehyde slow-release compound fertilizer and a preparation method thereof. Background technique [0002] Urea-formaldehyde slow-release compound fertilizer refers to a fertilizer with at least two nutrients produced by the online reaction of urea and formaldehyde or by adding powdered urea-formaldehyde slow-release nitrogen fertilizer through granulation (see GB / T 34763-2017 "Urea-formaldehyde slow-release fertilizer") . Urea and formaldehyde undergo addition and condensation reactions to form methylene urea and polymethylene urea, which are called urea formaldehyde. So urea-formaldehyde slow-release compound fertilizer is a compound fertilizer containing urea-formaldehyde, also called urea-formaldehyde slow-release compound fertilizer. [0003] In 1946, LeeJ.Y et al. found that the ammonia release rate of the condensation product of urea and formaldeh...

Claims

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Application Information

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IPC IPC(8): C05G1/00
CPCC05B11/10C05C9/02C05D1/02
Inventor 司志华郭强郭兴
Owner 山东和生海洋科技有限公司
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