CN105503279A - Slow-release urea formaldehyde fertilizer and preparation method thereof - Google Patents
Slow-release urea formaldehyde fertilizer and preparation method thereof Download PDFInfo
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- CN105503279A CN105503279A CN201510988380.9A CN201510988380A CN105503279A CN 105503279 A CN105503279 A CN 105503279A CN 201510988380 A CN201510988380 A CN 201510988380A CN 105503279 A CN105503279 A CN 105503279A
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- Prior art keywords
- urea formaldehyde
- slow
- release fertilizer
- urea
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
- C05C9/02—Fertilisers containing urea or urea compounds containing urea-formaldehyde condensates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
- Y02P60/21—Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
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- Organic Chemistry (AREA)
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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
The present invention relates to urea formaldehyde field of fertilizer production, be specifically related to a kind of urea formaldehyde slow-release fertilizer and preparation method thereof.
Background technology
Slow release fertilizer is as one of the fertilizer of the most potentiality of 21 century, the main sustained-controll-release fertiliser produced and use is divided into three types substantially both at home and abroad at present: the water soluble fertilizer that (1) physical barrier sexual factor controls, as coated granular fertilizer and matrix composite fertilizer; (2) slightly soluble organic nitrogen compound, as urea formaldehyde, iso-butylene diurea and other urea-formaldehyde condensates; (3) microsolubility mineral compound, as metal phosphorus ammonium salt, partial acidification phosphoric acid salt etc.Slow-release fertilizer decomposes release slowly in soil, and fertilizer efficiency period extends, and utilization ratio is higher, therefore in agricultural application, achieve single fertilization, exempt operation of topdressing, there is fertilizer amount reduce, use advantage easily, and then reach the comprehensive benefit of joint fertilizer, saving of labor, volume increase.
At present, urea formaldehyde is as one of topmost controlled release and slow-release fertilizer, there are very long research application and production history, the decomposition of urea-formaldehyde fertilizer mainly relies on biological effect, therefore, in the prior art, in urea formaldehyde, the release of nitrogen depends on change and the ambient conditions of soil property, as biological activity, clay content, pH, water content, warm and humid state, and then the regulation of fertilizer requirement making the fertilizer process of nutrients release in urea formaldehyde and farm crop absorb is inharmonious, and then fertilizer deficiency in seedling stage may be caused, plant-growth is slow; Or the later stage is de-fertile, affects yield and quality.
Summary of the invention
The present invention, for solving the problems of the technologies described above, provides a kind of Nitrogen releasing slow, the urea formaldehyde slow-release fertilizer that rate of release is relatively controlled, and the preparation method that production technique is simple, cost is low.
Be achieved especially by following scheme:
A kind of urea formaldehyde slow-release fertilizer, this urea formaldehyde slow-release fertilizer is in soil, and in urea formaldehyde, nitrogen element content C meets first _ order kinetics equation C=C
0(e-1-kt), wherein, C
0represent the initial content of nitrogen element in urea formaldehyde; What t represented this urea formaldehyde slow-release fertilizer uses a moon number; K represents coefficient, is 0.16-0.25.
Further, in the raw material that this urea formaldehyde slow-release fertilizer is used, the mol ratio of urea and formaldehyde is 1.3-1.6:1.
Its preparation method, comprises the following steps:
(1) formaldehyde is mixed 0.5-1h with alkali at temperature is 30-40 DEG C, obtain multicomponent mixed solution;
(2) multicomponent mixed solution is mixed 1-2h with urea at temperature is 75-80 DEG C, obtain urea formaldehyde liquid;
(3) urea formaldehyde liquid is mixed with auxiliary agent fully, direct spray granulating in prilling granulator, more after drying, obtain urea formaldehyde slow-release fertilizer.
The mass ratio of described formaldehyde and alkali is 50-500:1.
The Solution percentages concentration of described formaldehyde is 35-45%.
Described alkali is caustic soda.
The Solution percentages concentration of described caustic soda is 35-50%.
Described multicomponent pH of mixed is 7.0-8.4.
Described multicomponent pH of mixed is 7.6.
Described auxiliary agent is boric acid, humic acids, Xylo-Mucine.
The consumption of described auxiliary agent is (0.3-0.4) ‰ of urea formaldehyde liquid weight.
Beneficial effect of the present invention
Preparation technology of the present invention is simple, and energy consumption is low, and cost is low, and the content of its nitrogen is not by preparation environmental restraint, and constant product quality, sustained release performance is good, prevented from caking, reduces equipment damage rate, and not volatile or loss, can improve utilization rate of fertilizer 15%.Urea formaldehyde slow-release fertilizer of the present invention is in agricultural application, and the influence factor of its release rate of nitrogen is little, is substantially in controllable state, and then is easy to coordinate the fertilizer process of nitrogen element and the rule of crop need fertilizer, and then is conducive to growing of crop.
Embodiment
Below in conjunction with concrete embodiment, further restriction is done to technical scheme of the present invention, but claimed scope is not only confined to done description.
Embodiment 1
A kind of urea formaldehyde slow-release fertilizer forms primarily of following material molar ratio: formaldehyde: urea=1:1.3, and its preparation method is as follows:
(1) by Solution percentages concentration be 35% formaldehyde 100kg and Solution percentages concentration be 40% caustic soda 2.5kg, at temperature is 35 DEG C, mix 0.8h, obtain pH be 7.0 multicomponent mixed solution;
(2) urea of 260kg is added in multicomponent mixed solution, at temperature is 75 DEG C, mixes 2h, obtain urea formaldehyde liquid;
(3) boric acid (analytical pure) of 0.12kg is added in urea formaldehyde liquid after mixing fully, direct spray granulating in prilling granulator, dry at temperature is 100 DEG C, obtain urea formaldehyde slow-release fertilizer.
The total nitrogen of this urea formaldehyde slow-release fertilizer is 40.0%.
Embodiment 2
A kind of urea formaldehyde slow-release fertilizer forms primarily of following material molar ratio: formaldehyde: urea=1:1.5, and its preparation method is as follows:
(1) by Solution percentages concentration be 45% formaldehyde 50kg and Solution percentages concentration be 50% caustic soda 1kg, at temperature is 40 DEG C, mix 0.5h, obtain pH be 7.6 multicomponent mixed solution;
(2) urea of 150kg is added in multicomponent mixed solution, at temperature is 80 DEG C, mixes 1h, obtain urea formaldehyde liquid;
(3) Xylo-Mucine (analytical pure) of 0.078kg is added in urea formaldehyde liquid after mixing fully, direct spray granulating in prilling granulator, dry at temperature is 80 DEG C, obtain urea formaldehyde slow-release fertilizer.
The total nitrogen of this urea formaldehyde slow-release fertilizer is 40.3%.
Embodiment 3
A kind of urea formaldehyde slow-release fertilizer forms primarily of following material molar ratio: formaldehyde: urea=1:1.6, and its preparation method is as follows:
(1) by Solution percentages concentration be 40% formaldehyde 150kg and Solution percentages concentration be 35% caustic soda 0.3kg, at temperature is 30 DEG C, mix 1h, obtain pH be 8.4 multicomponent mixed solution;
(2) urea of 480kg is added in multicomponent mixed solution, at temperature is 77 DEG C, mixes 1.5h, obtain urea formaldehyde liquid;
(3) humic acids of 0.22kg is added in urea formaldehyde liquid after mixing fully, direct spray granulating in prilling granulator, dry at temperature is 70 DEG C, obtain urea formaldehyde slow-release fertilizer.
The total nitrogen of this urea formaldehyde slow-release fertilizer is 39.6%.
Test example 1
The beginning of April, urea formaldehyde slow-release fertilizer embodiment 1 prepared by every square metre of soil application 30g, and is joined and is executed 35g/m
2potash fertilizer, the thick 5cm of earthing, idle after 8 months, the content of Nitrogen In Soils element is 38.7%.
Test example 2
Mid-August, urea formaldehyde slow-release fertilizer embodiment 2 prepared is by every square metre of soil application 50g, and the thick 3cm of earthing, idle after 8 months, the content of Nitrogen In Soils element is 36.5%.
Test example 3
Late October, urea formaldehyde slow-release fertilizer embodiment 3 prepared by every square metre of soil application 40g, and is joined and is executed 20g/m
2phosphate fertilizer, the thick 3cm of earthing, idle after 8 months, the content of Nitrogen In Soils element is 38.5%.
Claims (10)
1. a urea formaldehyde slow-release fertilizer, is characterized in that, this urea formaldehyde slow-release fertilizer is in soil, and in urea formaldehyde, nitrogen element content C meets first _ order kinetics equation C=C
0(e-1-kt), wherein, C
0represent the initial content of nitrogen element in urea formaldehyde; What t represented this urea formaldehyde slow-release fertilizer uses a moon number; K represents coefficient, is 0.16-0.25.
2. urea formaldehyde slow-release fertilizer as claimed in claim 1, it is characterized in that, in the raw material that this urea formaldehyde slow-release fertilizer is used, the mol ratio of urea and formaldehyde is 1.3-1.6:1.
3. the preparation method of urea formaldehyde slow-release fertilizer as claimed in claim 1 or 2, is characterized in that, comprise the following steps:
(1) formaldehyde is mixed 0.5-1h with alkali at temperature is 30-40 DEG C, obtain multicomponent mixed solution;
(2) multicomponent mixed solution is mixed 1-2h with urea at temperature is 75-80 DEG C, obtain urea formaldehyde liquid;
(3) urea formaldehyde liquid is mixed with auxiliary agent fully, direct spray granulating in prilling granulator, more after drying, obtain urea formaldehyde slow-release fertilizer.
4. the preparation method of urea formaldehyde slow-release fertilizer as claimed in claim 3, it is characterized in that, the mass ratio of described formaldehyde and alkali is 50-500:1.
5. the preparation method of the urea formaldehyde slow-release fertilizer as described in claim 3 or 4, is characterized in that, the Solution percentages concentration of described formaldehyde is 35-45%.
6. the preparation method of the urea formaldehyde slow-release fertilizer as described in claim 3 or 4, is characterized in that, described alkali is caustic soda.
7. the preparation method of urea formaldehyde slow-release fertilizer as claimed in claim 6, it is characterized in that, the Solution percentages concentration of described caustic soda is 35-50%.
8. the preparation method of urea formaldehyde slow-release fertilizer as claimed in claim 3, it is characterized in that, described multicomponent pH of mixed is 7.0-8.4.
9. the preparation method of urea formaldehyde slow-release fertilizer as claimed in claim 8, it is characterized in that, described multicomponent pH of mixed is 7.6.
10. the preparation method of urea formaldehyde slow-release fertilizer as claimed in claim 3, is characterized in that, described auxiliary agent is boric acid, humus acid, Xylo-Mucine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510988380.9A CN105503279A (en) | 2015-12-24 | 2015-12-24 | Slow-release urea formaldehyde fertilizer and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510988380.9A CN105503279A (en) | 2015-12-24 | 2015-12-24 | Slow-release urea formaldehyde fertilizer and preparation method thereof |
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| CN105503279A true CN105503279A (en) | 2016-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510988380.9A Pending CN105503279A (en) | 2015-12-24 | 2015-12-24 | Slow-release urea formaldehyde fertilizer and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109757474A (en) * | 2019-03-05 | 2019-05-17 | 广西大学 | A kind of preparation method of pesticide slow-releasing agent |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4244727A (en) * | 1979-02-07 | 1981-01-13 | Ashland Oil, Inc. | Urea-formaldehyde solution for foliar fertilization |
| CN101260008A (en) * | 2007-03-09 | 2008-09-10 | 汉枫缓释肥料（黑龙江）有限公司 | Method for preparing ureaformaldehyde |
| CN101973818A (en) * | 2010-10-25 | 2011-02-16 | 余章成 | Process for pelleting urea formaldehyde controlled-release compound fertilizer in high tower |
| CN104276871A (en) * | 2014-10-23 | 2015-01-14 | 贵州省化工研究院 | Preparation method of urea-formaldehyde slow release fertilizer |
-
2015
- 2015-12-24 CN CN201510988380.9A patent/CN105503279A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4244727A (en) * | 1979-02-07 | 1981-01-13 | Ashland Oil, Inc. | Urea-formaldehyde solution for foliar fertilization |
| CN101260008A (en) * | 2007-03-09 | 2008-09-10 | 汉枫缓释肥料（黑龙江）有限公司 | Method for preparing ureaformaldehyde |
| CN101973818A (en) * | 2010-10-25 | 2011-02-16 | 余章成 | Process for pelleting urea formaldehyde controlled-release compound fertilizer in high tower |
| CN104276871A (en) * | 2014-10-23 | 2015-01-14 | 贵州省化工研究院 | Preparation method of urea-formaldehyde slow release fertilizer |
Non-Patent Citations (1)
| Title |
|---|
| 秦博静等: "一步法合成脲甲醛缓释肥的研究", 《磷肥与复肥》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109757474A (en) * | 2019-03-05 | 2019-05-17 | 广西大学 | A kind of preparation method of pesticide slow-releasing agent |
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Application publication date: 20160420 |