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Slow-release urea formaldehyde fertilizer and preparation method thereof

A urea-formaldehyde and slow-release fertilizer technology, applied in nitrogen fertilizer, fertilization device, urea compound fertilizer and other directions, can solve the problems of uncoordinated fertilizer demand, slow plant growth, insufficient fertilizer supply at seedling stage, etc. Good slow release performance, beneficial to growth and development

Inactive Publication Date: 2016-04-20
GUIZHOU RES INST OF CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, urea-formaldehyde, as one of the most important controlled-release and slow-release fertilizers, has a long history of research, application and production. The decomposition of urea-formaldehyde fertilizer mainly relies on the action of organisms. Therefore, in the prior art, urea-formaldehyde The release of nitrogen depends on changes in soil properties and external conditions, such as biological activity, clay content, pH, water content, temperature and humidity, and then makes the fertilizer supply process of urea-formaldehyde release and the law of fertilizer demand for crop absorption Uncoordinated, which may lead to insufficient fertilizer supply at the seedling stage and slow plant growth; or defertilization in the later stage, affecting yield and quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A urea-formaldehyde slow-release fertilizer mainly consists of the following molar ratios of raw materials: formaldehyde: urea=1:1.3, and its preparation method is as follows:

[0025] (1) 100 kg of formaldehyde with a solution percentage concentration of 35% and 2.5 kg of caustic soda with a solution percentage concentration of 40% were mixed for 0.8 h at a temperature of 35° C. to obtain a multi-component mixed solution with a pH of 7.0;

[0026] (2) Add 260kg of urea into the multi-component mixture, and mix for 2 hours at a temperature of 75°C to obtain a urea-formaldehyde liquid;

[0027] (3) After adding 0.12 kg of boric acid (analytical pure) into the urea-formaldehyde liquid and mixing fully, directly spray and granulate in a granulation device, and dry at a temperature of 100° C. to obtain a urea-formaldehyde slow-release fertilizer.

[0028] The total nitrogen content of the urea-formaldehyde slow-release fertilizer is 40.0%.

Embodiment 2

[0030] A urea-formaldehyde slow-release fertilizer mainly consists of the following molar ratios of raw materials: formaldehyde: urea=1:1.5, and its preparation method is as follows:

[0031] (1) 50 kg of formaldehyde with a solution percentage concentration of 45% and 1 kg of caustic soda with a solution percentage concentration of 50% were mixed for 0.5 h at a temperature of 40° C. to obtain a multi-component mixed solution with a pH of 7.6;

[0032] (2) Add 150kg of urea into the multi-component mixture, and mix for 1 hour at a temperature of 80°C to obtain a urea-formaldehyde liquid;

[0033] (3) Add 0.078 kg of sodium carboxymethyl cellulose (analytical pure) to the urea-formaldehyde liquid and mix well, then directly spray and granulate in the granulation device, and dry at a temperature of 80°C to obtain urea-formaldehyde sustained release Fat.

[0034] The total nitrogen content of the urea-formaldehyde slow-release fertilizer is 40.3%.

Embodiment 3

[0036] A urea-formaldehyde slow-release fertilizer mainly consists of the following molar ratios of raw materials: formaldehyde: urea=1:1.6, and its preparation method is as follows:

[0037] (1) 150 kg of formaldehyde with a solution percentage concentration of 40% and 0.3 kg of caustic soda with a solution percentage concentration of 35% are mixed for 1 hour at a temperature of 30° C. to obtain a multi-component mixed solution with a pH of 8.4;

[0038] (2) Add 480kg of urea into the multi-component mixture, and mix for 1.5 hours at a temperature of 77°C to obtain a urea-formaldehyde liquid;

[0039] (3) After adding 0.22 kg of humic acid into the urea-formaldehyde liquid and mixing fully, directly spray and granulate in the granulation device, and dry at a temperature of 70° C. to obtain urea-formaldehyde slow-release fertilizer.

[0040] The total nitrogen content of the urea-formaldehyde slow-release fertilizer is 39.6%.

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Abstract

The invention relates to the field of production of urea formaldehyde fertilizer, in particular to slow-release urea formaldehyde fertilizer and a preparation method thereof. The molar ratio of urea to formaldehyde in raw materials used by the slow-release urea formaldehyde fertilizer is (1.3-1.6):1, formaldehyde and alkali are mixed at the temperature of 30-40 DEG C for 0.5-1 h, a multi-component mixed liquid is obtained and mixed with urea at the temperature of 75-80 DEG C for 1-2 h, after a urea formaldehyde liquid is obtained, an aid is added, the mixture is evenly mixed, direct spraying granulation is performed in a granulation device, and the slow-release urea formaldehyde fertilizer is obtained after drying. The preparation technology is simple, energy consumption is low, the cost is low, the content of nitrogen is not limited by the preparation environment, and the product is stable in quality and good in slow release performance and cannot cake, volatilize or lose easily.

Description

technical field [0001] The invention relates to the field of urea-formaldehyde fertilizer production, in particular to a urea-formaldehyde slow-release fertilizer and a preparation method thereof. Background technique [0002] Slow-release fertilizers are one of the most potential fertilizers in the 21st century. At present, the slow-release fertilizers mainly produced and used at home and abroad are roughly divided into three types: (1) Water-soluble fertilizers controlled by physical barrier factors, such as coated fertilizers Granular fertilizers and matrix compound fertilizers; (2) Slightly soluble organic nitrogen compounds, such as urea formaldehyde, isobutylene cyclic diurea and other urea-formaldehyde condensates; (3) Slightly soluble inorganic compounds, such as metal ammonium phosphate, partially acidified phosphate, etc. The slow-release fertilizer decomposes slowly in the soil, prolongs the fertilizer effect period, and has a high utilization rate. Therefore, in ...

Claims

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Application Information

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IPC IPC(8): C05C9/02
CPCC05C9/02Y02P60/21
Inventor 田娟杨杰周昌平陈文兴陈思帆王瑶虞江
Owner GUIZHOU RES INST OF CHEM IND