CN101759498A - Degradable controlled release fertilizer - Google Patents
Degradable controlled release fertilizer Download PDFInfo
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- CN101759498A CN101759498A CN 200910230290 CN200910230290A CN101759498A CN 101759498 A CN101759498 A CN 101759498A CN 200910230290 CN200910230290 CN 200910230290 CN 200910230290 A CN200910230290 A CN 200910230290A CN 101759498 A CN101759498 A CN 101759498A
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Abstract
The invention discloses a degradable controlled release fertilizer with the controlled release period of 1 to 3 months. A preparation method for the degradable controlled release fertilizer comprises the following steps: firstly, preheating a granular fertilizer in coating equipment, adding modified urea formaldehyde resin into the coating equipment, and rotating the mixture in the coating equipment until a bonding liquid layer is formed on the surfaces of the fertilizer granules; secondly, mixing modified kaoline and monosodium glutamate residues uniformly, adding the mixture into the moving fertilizer granules in the coating equipment, heating continuously to maintain the temperature, rotating the mixture until coating materials are coated on the fertilizer granules uniformly, and curing the coating materials into a film to complete coating for the first time; and thirdly, repeating step one and step two sequently for multiple times until all the coating materials are coated on the fertilizer granules, and curing the coating layer to obtain the degradable controlled release fertilizer. The degradable controlled release fertilizer has good controlled release performance.
Description
Technical field
The invention belongs to field of fertilizer production, relate to a kind of degradable controlled release fertilizer and manufacture craft thereof.
Background technology
China's chemical fertilizer consumption amount accounts for the 20-30% of world Fertilizer total quantity consumed, ranks first in the world, and the chemical fertilizer this season utilization ratio average out to 50-60% of developed country, China's chemical fertilizer this season utilization ratio on average only is 30-35%.The loss waste of macronutrient not only brings enormous economic loss to society, but also can cause serious environmental to pollute.Improve utilization rate of fertilizer, reduce rate of fertilizer application, save the fertilising labor force, seem particularly important, slow/controlled release fertilizer makes it to absorb basic synchronised with crop nutrition content by the regulation and control to the nutrient release rate, can improve the fertilizer nutrient utilization ratio greatly, reduces widespread pollution from the overuse of fertilizers and pesticides in rural area, meet the requirement of national sustainable development strategy, so sustained-controll-release fertiliser has become one of main direction of 21 century fertilizer industry development.
In the seventies in 20th century, under Li Qing road academician presides over,, started the beginning of China's development slowly/controlled releasing fertilizer by the coated long-acting ammonium bicarbonate of Nanjing Soil Inst., Chinese Academy of Sciences and Nanjing chemical institute joint study exploitation.After the nineties, the development of slow/controlled release fertilizer enters fast-developing period, and a hundred flowers blossom for product such as coated with resin, sulphur dressing, sulfur and resin coated, nutrient material parcel, matrix composite, glued controlled release, zymetology inhibition and technology.Coated fertilizer has obtained people's favor because of its good slow controlled release properties, this technology generally with an organic solvent, technological design is comparatively complicated, production cost is higher, and its putamina generally also is difficult to degraded or degradation time is longer, so the selection of mould material and manufacture craft is the key of producing the degradable sustained-controll-release fertiliser.Existing research report (preparation and the fertilizer efficiency research of the special-purpose high molecular slow-release fertilizer of corn of using urea aldehyde oligopolymer to make slow release fertilizer; Northcentral University's journal; 2007 the 28th the 2nd phases of volume); as everyone knows; the production technique of urea aldehyde polymer, Resin adhesive has determined its product to contain free formaldehyde; therefore must carry out modification at the free formaldehyde of urea-formaldehyde resin adhesive, remove the free formaldehyde of urea-formaldehyde resin adhesive, could the real purpose that realizes protection food safety and agroecological environment.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can improve utilization rate of fertilizer; can protect degradable coated slow release fertilizer of agroecological environment and preparation method thereof again; this technological operation is simple; cheap; the nutrient controlled release properties is good; its method is to use modified urea-formaldehyde resin that the solid film material is wrapped in the fertiliser granulates surface, makes film-coated and slow release fertilizer.
Technical scheme of the present invention is as follows:
A kind of degradable controlled release fertilizer, its slow-release period is 1-3 month, making method is as follows:
The first step: granulated fertilizer is preheated to 40-52 ℃ in encapsulation tool, adds the modified urea-formaldehyde resin that accounts for granulated fertilizer quality 0.5-5%, in encapsulation tool, turn to the fertiliser granulates surface and form the bonding liquid layer,
Second step: after modified kaolin and residue of monosodium glutamate mixed, be added on the fertiliser granulates that moves in the encapsulation tool, continue heating and keep 40-55 ℃ of temperature, turning to mould material is wrapping on the fertiliser granulates uniformly, and film-forming, finish coating one time, the usage quantity of modified kaolin and residue of monosodium glutamate accounts for the 2-9% of granulated fertilizer quality
The 3rd step: repeat first and second step in order repeatedly, all be wrapped on the fertiliser granulates until coated fertilizer, coating layer solidifies, and makes degradable controlled release fertilizer.
Aforesaid degradable controlled release fertilizer, optimized technical scheme are that modified kaolin and residue of monosodium glutamate blended ratio are modified kaolin 7-9 parts in second step, residue of monosodium glutamate 1-3 part.
Aforesaid degradable controlled release fertilizer, optimized technical scheme are, also comprise for the 4th step: use the talcum powder that accounts for granulated fertilizer quality 0.5% to make the surface face powder and handle, make finished product.
Aforesaid degradable controlled release fertilizer, optimized technical scheme are that described modified kaolin adopts cetyl trimethylammonium bromide (HDTMA) to handle.
Aforesaid degradable controlled release fertilizer, optimized technical scheme are, have added the sulfonated lignin that accounts for total mass 39-42% in the described modified urea-formaldehyde resin making processes.
Aforesaid degradable controlled release fertilizer, optimized technical scheme are that the each consumption of modified urea-formaldehyde resin described in the first step accounts for the 1-3% of granulated fertilizer quality.
Aforesaid degradable controlled release fertilizer, optimized technical scheme are that the residue of monosodium glutamate particle size range is 0.05-0.3mm described in second step.
Aforesaid degradable controlled release fertilizer, optimized technical scheme are that the usage quantity of modified kaolin and residue of monosodium glutamate accounts for the 2-5% of granulated fertilizer quality in second step.
Aforesaid degradable controlled release fertilizer, optimized technical scheme are that described encapsulation tool is granulating disc, rotary drum or fluidized-bed.
Degradable controlled release fertilizer of the present invention can be according to the demand of crop to slow-release period, determines to repeat the number of times of first, second step, and multiplicity is many more, and slow-release period is long more, and handicraft product of the present invention slow-release period is 1-3 month.
The present invention is with modified urea-formaldehyde resin, modified kaolin and fertilizer are main coated fertilizer, do not use solvent, production technique is simple, can reduce the production cost of coating controlled-release fertilizer significantly, improve utilization rate of fertilizer, the control and controlled release fertilizer the applying on field crop that help widespread pollution from the overuse of fertilizers and pesticides in rural area, the present invention also possesses following excellent results in addition: modified urea-formaldehyde resin is in illumination, in moisture and the soil under the action of microorganisms, can in 1 year, degrade gradually, protected edatope on the one hand, on the other hand, because modified urea-formaldehyde resin is an organic nitrogen compound, the nitrogen nutrient that can replenish after its degraded in the soil is made for the thing absorption; Modified kaolin can adsorb the organophosphorus pesticide in the soil, can purify rehabilitating soil; Fertilizer in the prescription is rich in humic acids, and humic acids can activate nutrient, and improvement low productive soil physical and chemical character increases the content of soil with organic matter, quick-acting nitrogen, rapid available phosphorus, available potassium, and helps the growth of microflora in the soil.
Description of drawings
Fig. 1 is slow-release compound fertilizer cumulative release graphic representation in 25 ℃ of water of 1 month slow-release period 21-8-11.
Fig. 2 is slow-release carbamide cumulative release graphic representation in 25 ℃ of water of 2 months slow-release periods 46-0-0.
Fig. 3 is that the slow-release carbamide of 3 months slow-release periods 46-0-0 is at 25 ℃ of water cumulative release graphic representations.
Embodiment
Below in conjunction with embodiment, experimental example and accompanying drawing technical scheme of the present invention is done detailed description, but protection domain is not by this restriction.Raw materials used or equipment all can be bought from market among each embodiment.Used kaolin is available from Shandong Tai Fengization trick-cycling art equipment institute, model T-3-1, cetyl trimethylammonium bromide (HDTMA) (available from the quick vast and boundless Fine Chemical Co., Ltd in the Shanghai) modification of this kaolin, the method for modification can be with reference to Gao Yesong (Ye-Song Gao); Ouyang is led to (Tong Ouyang); Zhang Jiaoling (Jiao-Ling Zhang); Liu Yaoxing (Yao-Xing Liu, " the organic kaolin of HDTMA is to the absorption property of isofenphos_methyl ", Huaqiao University's journal, 30 volume 1 phases (2009/01); Used urea-formaldehyde resin is available from Heze City east resin processing plant, specification is the E0 level, sulfonated lignin (available from another name for Sichuan Province, Jiangan County, the Sichuan Province star Paper Co., Ltd) modification of this urea-formaldehyde resin, method can be with reference to Liu Huiji, Shu Yude, " research of xylogen sulfonation ", the chemical industry Times, 2000 the 14th the 12nd phases of volume.
Embodiment 1
Weighing 21-8-11 granular compound fertilizer 500kg, in granulating disc, be preheated to 40 ℃, weighing 5kg modified urea-formaldehyde resin is added on the fertiliser granulates of motion, along with fertiliser granulates constantly moves, form the bonding liquid layer on its surface, be added to after load weighted 10.5kg modified kaolin and 4.5kg residue of monosodium glutamate mixed on the fertilizer in the granulating disc, continue heating and keep 40-52 ℃ of temperature, continuous rotation along with tablets press, modified kaolin and residue of monosodium glutamate evenly are wrapped in the fertilizer surface, until film-forming; According to the coated fertilizer amount of above-mentioned weighing, on the 21-8-11 granular composite fertilizer, repeat again to wrap up 1 time, can make about 8%, 1 month the degradable controlled release fertilizer of slowly-releasing of coating rate.
Embodiment 2
On the basis of embodiment 1, increase by a treatment step again, be about to fertilizer that embodiment 1 obtained again with the conditioning of 2.5kg talcum powder surface, cooling, packing warehouse-in.
Embodiment 3
Weighing 46-0-0 granular urea 1000kg, in granulating disc, be preheated to 45 ℃, weighing 20kg modified urea-formaldehyde resin is added on the fertiliser granulates of motion, along with fertiliser granulates constantly moves, form the bonding liquid layer on its surface, be added to after load weighted 40kg modified kaolin and 10kg residue of monosodium glutamate mixed on the fertilizer in the granulating disc, continue heating and keep 40-52 ℃ of temperature, continuous rotation along with tablets press, modified kaolin and residue of monosodium glutamate evenly are wrapped in the fertilizer surface, until film-forming; According to the coated fertilizer amount of above-mentioned weighing, on granular urea, repeat again to wrap up 1 time, can make about 14%, 2 months the degradable controlled release fertilizer of slowly-releasing of coating rate, with the conditioning of 5kg talcum powder surface, cooling, packing warehouse-in.
Embodiment 4
Weighing 46-0-0 granular urea 1000kg, in fluidized-bed, be preheated to 52 ℃, weighing 30kg modified urea-formaldehyde resin is added on the fertiliser granulates of motion, along with fertiliser granulates constantly moves, form the bonding liquid layer on its surface, after being mixed, load weighted 63kg modified kaolin and 7kg residue of monosodium glutamate be added on the fertilizer in the granulating disc, continue heating and keep 40-52 ℃ of temperature, along with the continuous rotation of tablets press, modified kaolin and residue of monosodium glutamate evenly are wrapped in the fertilizer surface, until film-forming; According to the coated fertilizer amount of above-mentioned weighing, on granular urea, repeat again to wrap up 1 time, can make about 20%, 3 months the degradable controlled release fertilizer of slowly-releasing of coating rate, with the conditioning of 5kg talcum powder surface, cooling, packing warehouse-in.
Experimental example
Test method: take by weighing the 10g fertilizer sample,, put into the pouch made from 100 order nylon gauzes and seal accurately to 0.01g, pouch is put into the 250ml separating funnel, and adding distil water 250ml seals in the constant incubator that is placed on 25 ℃ then, do 3 times parallel, do blank test simultaneously.At 1d, 3d, 7d, 14d, 28d, 60d, 90d, 120d ... sampling and measuring reaches 80% up to nutrient cumulative release rate.
Fig. 1 is slow-release compound fertilizer (embodiment 1) the cumulative release graphic representation of 1 month slow-release period 21-8-11.Fig. 2 is slow-release carbamide (embodiment 3) the cumulative release graphic representation of 2 months slow-release periods 46-0-0.Fig. 3 is slow-release carbamide (embodiment 4) the cumulative release graphic representation of 3 months slow-release periods 46-0-0.By Fig. 1-3 as can be known, degradable controlled release fertilizer of the present invention meets the national sustained-controll-release fertiliser GB/T 23348-2009 standard that played enforcement on 09 01st, 2009, have slow release effect preferably, aspect improving utilization rate of fertilizer, avoiding widespread pollution from the overuse of fertilizers and pesticides in rural area, obtained outstanding technique effect.
Claims (9)
1. a degradable controlled release fertilizer is characterized in that, slow-release period is 1-3 month, and making method is as follows:
The first step: granulated fertilizer is preheated to 40-52 ℃ in encapsulation tool, adds the modified urea-formaldehyde resin that accounts for granulated fertilizer quality 0.5-5%, in encapsulation tool, turn to the fertiliser granulates surface and form the bonding liquid layer,
Second step: after modified kaolin and residue of monosodium glutamate mixed, be added on the fertiliser granulates that moves in the encapsulation tool, continue heating and keep 40-55 ℃ of temperature, turning to mould material is wrapping on the fertiliser granulates uniformly, and film-forming, finish coating one time, the usage quantity of modified kaolin and residue of monosodium glutamate accounts for the 2-9% of granulated fertilizer quality
The 3rd step: repeat first and second step in order repeatedly, all be wrapped on the fertiliser granulates until coated fertilizer, coating layer solidifies, and makes degradable controlled release fertilizer.
2. the described degradable controlled release fertilizer of claim 1 is characterized in that, modified kaolin and residue of monosodium glutamate blended ratio are modified kaolin 7-9 parts in second step, residue of monosodium glutamate 1-3 part.
3. the described degradable controlled release fertilizer of claim 1 is characterized in that, also comprises for the 4th step: use the talcum powder that accounts for granulated fertilizer quality 0.5% to do surface treatment, make finished product.
4. the arbitrary described degradable controlled release fertilizer of claim 1-3 is characterized in that, described modified kaolin adopts cetyl trimethylammonium bromide to handle.
5. the arbitrary described degradable controlled release fertilizer of claim 1-3 is characterized in that, has added the sulfonated lignin of 39-42% in the described modified urea-formaldehyde resin making processes.
6. the arbitrary described degradable controlled release fertilizer of claim 1-3 is characterized in that, the each consumption of modified urea-formaldehyde resin described in the first step accounts for the 1-3% of granulated fertilizer quality.
7. the arbitrary described degradable controlled release fertilizer of claim 1-3 is characterized in that, the residue of monosodium glutamate particle size range is 0.05-0.3mm described in second step.
8. the arbitrary described degradable controlled release fertilizer of claim 1-3 is characterized in that, the usage quantity of modified kaolin and residue of monosodium glutamate accounts for the 2-5% of granulated fertilizer quality in second step.
9. the arbitrary described degradable controlled release fertilizer of claim 1-3 is characterized in that, described encapsulation tool is granulating disc, rotary drum or fluidized-bed.
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| CN 200910230290 CN101759498B (en) | 2009-11-20 | 2009-11-20 | Degradable controlled release fertilizer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103130566A (en) * | 2011-12-02 | 2013-06-05 | 中国农业科学院农业资源与农业区划研究所 | Adjustable slow release BB fertilizer special for applying for cucumber and preparation method of adjustable slow release BB fertilizer |
| WO2014047793A1 (en) * | 2012-09-26 | 2014-04-03 | Upm-Kymmene Corporation | Method of preparing slow release fertilizer |
| CN105272706A (en) * | 2015-11-10 | 2016-01-27 | 叶青军 | Environment-friendly temperature control fertilizer capable of restraining and expelling pests |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103193549A (en) * | 2013-05-05 | 2013-07-10 | 付增传 | Degradable resin envelop slow-control fertilizer-releasing production process |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1198427A (en) * | 1997-05-01 | 1998-11-11 | 吕庆淮 | Nitrogenous phosphate potash long-effect compound fertilizer and productive method thereof |
| CN1281556C (en) * | 2003-07-21 | 2006-10-25 | 南京大学 | Coated slow-release urea and its preparation method |
| CN100400478C (en) * | 2006-07-07 | 2008-07-09 | 朱丙臣 | Coated degradable release-controlled fertilizer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103130566A (en) * | 2011-12-02 | 2013-06-05 | 中国农业科学院农业资源与农业区划研究所 | Adjustable slow release BB fertilizer special for applying for cucumber and preparation method of adjustable slow release BB fertilizer |
| WO2014047793A1 (en) * | 2012-09-26 | 2014-04-03 | Upm-Kymmene Corporation | Method of preparing slow release fertilizer |
| CN104603085A (en) * | 2012-09-26 | 2015-05-06 | 芬欧汇川集团 | Method of preparing slow release fertilizer |
| US9446993B2 (en) | 2012-09-26 | 2016-09-20 | Upm-Kymmene Corporation | Method of preparing a slow release fertilizer |
| CN104603085B (en) * | 2012-09-26 | 2017-07-11 | 芬欧汇川集团 | The method for preparing slow release fertilizer |
| CN105272706A (en) * | 2015-11-10 | 2016-01-27 | 叶青军 | Environment-friendly temperature control fertilizer capable of restraining and expelling pests |
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