CN1686967A - Long acting controlled release formulation fertilizer containing nitrogen and preparing process thereof - Google Patents
Long acting controlled release formulation fertilizer containing nitrogen and preparing process thereof Download PDFInfo
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- CN1686967A CN1686967A CN 200510013363 CN200510013363A CN1686967A CN 1686967 A CN1686967 A CN 1686967A CN 200510013363 CN200510013363 CN 200510013363 CN 200510013363 A CN200510013363 A CN 200510013363A CN 1686967 A CN1686967 A CN 1686967A
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- amidinothiourea
- release dosage
- dyhard
- nitrogenous fertilizer
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Abstract
The present invention discloses a long-acting slowly-releasing agent containing nitrogen fertilizer and its preparation method, belonging to the slow release technique of fertilizer. The described slowly-releasing agent contains the following components: (by mass%) dicyandiamide 30-50%, guanyl thiourea 35-45% and urease inhibitor 15-25%. Besides, said invention also provides the concrete steps of its preparation method.
Description
Technical field
The present invention relates to long-acting sustained-release agent of a kind of nitrogenous fertilizer and preparation method thereof.The slow release method that belongs to fertilizer.
Background technology
Fertilizer is the grain of farm crop, is the important foundation of developing agricultural, and it is fairly obvious to the output that improves farm crop.And the utilization rate of nitrogen fertilizer of China has only about 35% at present.How improving nitrogenous fertilizer utilization ratio is the important topic of chemical fertilizer industry and agricultural.Using fertilizer synergist is one of highly effective way that improves its utilization ratio, and nitrated/urease inhibitor is the important kind of nitrogenous fertilizer and nitrogenous multiple fertile synergistic agent.
Nitrification inhibitor is over a period to come by suppressing a class material of microorganism active such as soil Central Asia bacterial digestion.It can suppress processes such as nitrosification, nitrated, denitrification after entering soil, hinders NH
4 +To NO
2 -, NO
3 -Conversion process.Make the nitrogenous fertilizer long period with NH
4 +The form of-N exists, and for crop absorption, reduces NO
2 --N, NO
3 -The loss that the leaching of-N and denitrification cause not only reduces the pollution of river, can also increase the absorbed dose of phosphorus in the phosphate fertilizer.
Urease inhibitor is the activity that can suppress urase in the soil, and amidonitrogen is converted into ammonia-state nitrogen in the inhibition urea, reduces the hydrolysis rate of urea and nitrogenous fertilizer, reduces the loss of ammonia and the accumulation of nitrous acid.
DCD uses wider nitrification inhibitor at present.It can not only increase absorption and the curing of soil colloid to ammonium ion, can slow down the reaction that ammonia-state nitrogen is converted into nitric nitrogen again.But it is to Different Crop, different soils, and different humidity, the differing temps suitability is lower.During greater than 35 ℃, it is ineffective to nitrobacteria as temperature.And GTU (C
2H
6N
4S) be a kind of nitrification inhibitor of brilliance.Soil is had very strong adsorptivity, and strong to the flushing resistibility of rainwater, volatility is low.Various condition suitabilities are stronger.But easily decomposed by saccharase effect in the soil.And CDD can face upward the degraded of system GTU.So the composite use of GTU and DCD just in time can be got long filling a vacancy, and has complementary advantages.But commercially available GTU costs an arm and a leg, and has limited using and promoting of they.
Summary of the invention
The object of the present invention is to provide long-acting sustained-release agent of a kind of nitrogenous fertilizer and preparation method thereof.Described sustained release dosage has good slow control effect to nitrogenous fertilizer.Thereby improved nitrogenous fertilizer utilization ratio, its preparation method is simple, and production cost is low.
The present invention is realized by following technical proposals.A kind of long-acting sustained-release agent of nitrogenous fertilizer is characterized in that containing following component and mass content thereof:
Dyhard RU 100: 30～50%
Amidinothiourea: 35～45%
Urease inhibitor: 15～25%
Above-mentioned urease inhibitor is one or both in borax, ammonium thiosulfate or the thiocarbamide.
The preparation method of above-mentioned sustained release dosage, its feature comprises following process.
1. the preparation of amidinothiourea
Under 10～45 ℃ of normal pressure and temperature, be that 1: 1 amount is sequentially added into and contains H in molar ratio with Dyhard RU 100 (DCD) and thiosulphate
+Be 1.5～3.5mol L
-1HCl or H
2SO
4In the solution, and wherein DCD and H
+Mol ratio is 1: 1～2, and reaction generates the hydrosulfate of amidinothiourea, uses in NaOH, KOH or the ammoniacal liquor then and the generation amidinothiourea.
2. the preparation of sustained release dosage
The urease inhibitor of the amidinothiourea of the quality 35～45% of the Dyhard RU 100 of quality 30～50% and step 1. preparation and quality 15～25% mixed stirs the long-acting sustained-release agent that is mixed with nitrogenous fertilizer,
Above-mentioned thiosulphate is Sulfothiorine or ammonium thiosulfate.
The invention has the advantages that, preparation process is simple, and the sustained release dosage of prepared nitrogenous fertilizer has the good slow release effect, can reach 120 days to the slow releasing function of nitrogenous fertilizer, its raw materials for production amidinothiourea price just shows 60～70% of market price, and production cost is low.
Embodiment
Example 1:
In container, add 42gDCD (0.5mol), water 200ml and 37%HCl 42ml (0.5mol), stirring and dissolving at 30 ℃, slowly drips in 20 minutes and contains Na
2S
2O
35H
2The solution of O 125g (0.5mol, 200ml water dissolution).The restir reaction adds 2mol L after 1 hour
-1NaOH solution makes liquid be slight alkalinity.Overnight, crystallization is filtered, a little cold water washing, the dry product 45.8g that gets.Product yield is 75%, and analyzing its purity with HPLC is 78%.Under fully stirring, make the sustained release dosage of amidinothiourea 45g and 35g Dyhard RU 100 and the nitrogenous fertilizer of 20g borax preparation 100g with this example.
Example 2:
Add 42gDCD (0.5mol) in container, water 200ml and 37%HCl 63ml (0.75mol) stir to hold and separate.Under normal temperature (20 ℃), slowly drip in 20 minutes and contain Na
2S
2O
35H
2The solution of O 125g (0.5mol, 200ml water dissolution).Stirring reaction adds 2moL again after 1 hour
-1NaOH makes liquid to slight alkalinity.Crystallization overnight is filtered, a little cold water washing, the dry product 47g that gets.Product yield is 80%, and analyzing its purity with HPLC is 81%.Under fully stirring, make the sustained release dosage of amidinothiourea 43g and 40g Dyhard RU 100 and the nitrogenous fertilizer of 17g ammonium thiosulfate preparation 100g with this example.
Example 3:
In container, add 42gDCD, 200ml water and 37%HCl 63ml (0.75mol), at room temperature (10 ℃), the slow dropping contains Na in 20 minutes
2S
2O
35H
2The solution of O 125g (0.5mol, use the 200ml water dissolution).Stirring reaction adds 25% strong aqua and transfers to liquid and be slight alkalinity after 1 hour.The crystallization of spending the night is filtered, and uses a little cold water washing, exsiccant product 46.4g.Product yield is 79%, and analyzing its purity with HPLC is 86.2%.Under fully stirring, make the sustained release dosage of amidinothiourea 38g and 40g Dyhard RU 100 and 12g borax, the nitrogenous fertilizer of 10g thiocarbamide preparation 100g with this example.
Example 4
Add 42gDCD in container, 200ml water and 37%HCl63ml (0.75mol) under room temperature (45 ℃), slowly drip (NH in 20 minutes
4)
2S
2O
3(55%) solution 135ml.Stirring reaction adds 25% strong aqua (about 60ml) to making liquid be slight alkalinity after 1 hour.A little cold water washing, drying are filtered in the crystallization of spending the night.Get product 47.6g, yield is 81%, and analyzing its purity with HPLC is 88%.Under fully stirring, make the sustained release dosage of amidinothiourea 38g and 38g Dyhard RU 100 and 14g borax, the nitrogenous fertilizer of 10g ammonium thiosulfate preparation 100g with this example.
Claims (4)
1. the long-acting sustained-release agent of a nitrogenous fertilizer is characterized in that containing following component and mass content thereof:
Dyhard RU 100: 30～50%;
Amidinothiourea: 35～45%;
Urease inhibitor: 15～25%.
2. by the sustained release dosage of stating of claim 1, it is characterized in that urease inhibitor is one or both in borax, ammonium thiosulfate or the thiocarbamide.
3. preparation method who states sustained release dosage by claim 1, its feature comprises following process:
1). the preparation of amidinothiourea
Under 10～45 ℃ of normal pressure and temperature, be that 1: 1 amount is sequentially added into and contains H in molar ratio with Dyhard RU 100 and thiosulphate
+Be 1.5～3.5mol L
-1HCl or H
2SO
4In the solution, and wherein DCD and H
+Mol ratio is 1: 1～2, and reaction generates the hydrosulfate of amidinothiourea, uses in NaOH, KOH or the ammoniacal liquor then and the generation amidinothiourea;
2). the preparation of sustained release dosage
The urease inhibitor of the amidinothiourea of the quality 35～45% of the Dyhard RU 100 of quality 30～50% and step 1) preparation and quality 15～25% mixed stir the long-acting sustained-release agent that is mixed with nitrogenous fertilizer.
4. by the preparation method of the described sustained release dosage of claim 3, it is characterized in that thiosulphate is Sulfothiorine or ammonium thiosulfate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510013363 CN1686967A (en) | 2005-04-27 | 2005-04-27 | Long acting controlled release formulation fertilizer containing nitrogen and preparing process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510013363 CN1686967A (en) | 2005-04-27 | 2005-04-27 | Long acting controlled release formulation fertilizer containing nitrogen and preparing process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1686967A true CN1686967A (en) | 2005-10-26 |
Family
ID=35305009
Family Applications (1)
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|---|---|---|---|
| CN 200510013363 Pending CN1686967A (en) | 2005-04-27 | 2005-04-27 | Long acting controlled release formulation fertilizer containing nitrogen and preparing process thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101891541A (en) * | 2010-07-13 | 2010-11-24 | 李胜 | Multifunctional slow-release fertilizer additive |
| CN106220457A (en) * | 2016-07-15 | 2016-12-14 | 宋世贤 | A kind of slow releasing agent of urea and preparation method thereof and using method |
| CN110050649A (en) * | 2019-03-19 | 2019-07-26 | 广东省农业科学院农业资源与环境研究所 | A kind of pakchoi high yield dense planting and fertilizing method |
-
2005
- 2005-04-27 CN CN 200510013363 patent/CN1686967A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101891541A (en) * | 2010-07-13 | 2010-11-24 | 李胜 | Multifunctional slow-release fertilizer additive |
| CN101891541B (en) * | 2010-07-13 | 2014-11-26 | 李胜 | Multifunctional slow-release fertilizer additive |
| CN106220457A (en) * | 2016-07-15 | 2016-12-14 | 宋世贤 | A kind of slow releasing agent of urea and preparation method thereof and using method |
| CN110050649A (en) * | 2019-03-19 | 2019-07-26 | 广东省农业科学院农业资源与环境研究所 | A kind of pakchoi high yield dense planting and fertilizing method |
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| WD01 | Invention patent application deemed withdrawn after publication |