CN101774867A - Enveloping controlled release urea and production method thereof - Google Patents
Enveloping controlled release urea and production method thereof Download PDFInfo
- Publication number
- CN101774867A CN101774867A CN201010112160A CN201010112160A CN101774867A CN 101774867 A CN101774867 A CN 101774867A CN 201010112160 A CN201010112160 A CN 201010112160A CN 201010112160 A CN201010112160 A CN 201010112160A CN 101774867 A CN101774867 A CN 101774867A
- Authority
- CN
- China
- Prior art keywords
- waste
- ratio
- urea
- old
- coated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Fertilizers (AREA)
Abstract
The invention discloses an enveloping controlled release urea and a production method thereof. The method comprises the following steps of: heating enveloping materials and dissolving in an organic solvent to form a coating liquid; then uniformly mixing the coating liquid with talcum powder and spraying on the surface of the urea; and drying to obtain the enveloping controlled release urea, wherein the organic solvent is dipentene. In the invention, the dipentene is used as the solvent of the enveloping materials for producing the enveloping urea, the hazard to people is low during the production, the storage requirements are low, and the quality of the enveloping urea is stable. Recycled waste plastics are utilized as the enveloping materials, the production cost is greatly reduced, and the enveloping controlled release urea can be popularized and applied to the field crop.
Description
Technical field
The present invention relates to the film-coated controlled release fertilizer field, particularly relate to a kind of coated release-controlled urea and production method thereof.
Background technology
At present, common control release urea generally is the polymer coated release-controlled urea, promptly adopt the very low macromolecule resin material spray of moisture transmitance to wrap in the urea granules surface, form the very low resin molding of one deck moisture permeable, after fertilizer was used, the moisture in the soil entered in the fertiliser granulates by resin molding, nutrient stripping film is made for thing outward to be absorbed, the dissolution rate of fertilizer in the film is exactly the effective velocity that fertilizer nutrient discharges, and nutrient controlled release speed is controlled by coating.
Coated carbamide production adopts spouted bed coating mode to produce usually: the polymer coated fertilizer is dissolved in the solvent, form certain density solution, by nozzle solution evenly is sprayed at the urea granules surface, then with high temperature with solvent evaporates, solvent by the cooling recycling.Its process flow sheet comprises the steps: that (1) is dissolved in coated fertilizer more than 100 ℃ in the pyritous solvent, forms covering liquid as shown in Figure 1; (2) gas blower 1 will be blown into conduit 3 by the high-pressure blast of well heater 2 heating; (3) urea granules is added by charging opening 4, flow to nozzle 7 places and is held up by high-pressure blast and pass conduit 3 and fall and flow to nozzle 7 places again and circulate repeatedly; (4) covering liquid wraps in the urea granules surface by pressure pump 5 sucking-off from dissolving tank 6 by nozzle 7 ejections; (5) high temperature and high speed wind makes it form a skim on the urea granules surface covering liquid drying, and solvent is by condenser 8 recyclings.Wherein, dissolving polymer coated fertilizer is general both at home and abroad at present to use the more of petroleum-type solvent, as turps, toluene, dimethylbenzene, sherwood oil etc., in addition as: trieline, zellon etc.; The polymer coated fertilizer is used polyethylene, polypropylene, polystyrene, polyvinyl alcohol, cellulose acetate, match dew etc. more, but generally can only can not use two defective materials or waste and old material with a defective material; The coating additive adopts inorganic minerals such as talcum powder, wilkinite, diatomite more; The coating object has granular urea, ammonium phosphate, potash fertilizer, various nutrient content composite fertilizer etc.
Polymer coated release-controlled urea effect is used through for many years and is proved, but because production cost is higher, limits it and use, and the production cost that reduces fertilizer is that current control release urea research improves an of paramount importance ring.At present, the production of polymer coated release-controlled urea has the following disadvantages:
(1) fertilizer coating material, additive and tooling cost are higher, have limited the application of fertilizer;
(2) used petroleum-type solvent toxicity is higher, production, unfavorable to production and user of service's health when using; And this kind solvent belongs to the inflammable and explosive solvent of one-level more, uses and causes danger easily when preserving, and requires high to the anti-explosion fire of factory building; Other solvents damage the ozone layer as trieline, zellon, and are unfavorable to environment, have been limited to use.In addition, use more turps as solvent during coated carbamide is produced at present, because it is on the high side, therefore the film-coated controlled release fertilizer cost of producing is higher, has limited the widespread use of this type of fertilizer on field crop.
Summary of the invention
The purpose of this invention is to provide a kind of coated release-controlled urea and production method thereof.
The method of utilizing waste or used plastics to produce coated release-controlled urea provided by the present invention, comprise the steps: the coated fertilizer heating for dissolving is formed covering liquid in organic solvent, to be sprayed on urea surface behind described covering liquid and the talcum powder mixing then, drying obtains coated release-controlled urea; Wherein, described organic solvent is a kautschin.
Among the above-mentioned preparation method, the ratio of weight and number of described coated fertilizer and described kautschin is 3-18: 100, and any one in the preferred following ratio a-ratio 1:
Ratio a:9: 100,
Ratio b:11: 100,
Ratio c:12: 100,
Ratio d:3.5: 100,
Ratio e:10: 100,
Ratio f:3.5-9: 100,
Ratio g:3.5-10: 100,
Ratio h:3.5-11: 100,
Ratio i:3.5-12: 100,
Ratio j:10-12: 100,
Ratio k:10-11: 100,
Ratio l:11-12: 100.
In the described dissolving step, temperature is 140-150 ℃, preferred 145 ℃.The ratio of weight and number of described urea and described kautschin is 110-130: 100, and preferred 125: 100.
In order to reduce the production cost of fertilizer, can select for use waste or used plastics as coated fertilizer, as various waste and old wrapping material, awning film, mulch film, waste or used plastics tubing etc., described waste or used plastics is selected from any one among the following material a-material f:
Material a: waste polyethylene;
Material b: waste and old polypropylene,
Material c: the mixture of waste polyethylene and waste and old polypropylene,
Material d: the mixture of waste polyethylene and waste and old polystyrol,
Material e: the mixture of waste and old polypropylene and waste and old polystyrol,
Material f: the mixture of waste polyethylene, waste and old polypropylene and waste and old polystyrol.
Among the described material d, the ratio of weight and number of described waste polyethylene and waste and old polystyrol is 8: 3;
Among the described material e, the ratio of weight and number of described waste and old polypropylene and described waste and old polystyrol is 8: 3;
Among the described material f, the ratio of weight and number of described waste polyethylene, described waste and old polypropylene and described waste and old polystyrol is selected from any one in following component I-component III: component I: 6: 6: 3, component I I:1.5: 1.5: 0.5, component III: 4: 4: 2.After waste and scrap reclaims, clean, can be directly used in the fertilizer coating of coated release-controlled urea to not containing foreign material such as bigger grogs, blade of grass, paper.
The coating rate of above-mentioned coated controlled-release urea fertilizer is generally 4-13%, and the coating rate of fertilizer depends primarily on the control release urea nutrient that will produce and discharges fate.
In preparation during coated carbamide, be the conditioned fertilizer product nutrient releasing speed and reduce production costs as the talcous effect of coating additive.The ratio of weight and number of described talcum powder and described kautschin is 0.5-3: 100, and preferred 1.25: 100.In addition, form the respond well coated carbamide of coating in order to guarantee that urea granules can be held up by gas blower, the urea particle diameter that needs to limit as raw material is the 0.5-5 millimeter.
The coated release-controlled urea for preparing according to the method described above also belongs to protection scope of the present invention.
The present invention produces coated carbamide with kautschin as the solvent of coated fertilizer, compare with the production method of existing coated carbamide, have following advantage: kautschin is a low-toxic solvent, harm to the people in the production is low, and kautschin belongs to the inflammable and explosive solvent of secondary, keeping requires lower, has reduced the keeping cost; As the coating additive, the talcum powder light specific gravity is than easy and macromolecular material mixing, the effectively release conditions of conditioned fertilizer product nutrient with talcum powder; Use the waste or used plastics that reclaims as coating master material, its price is 1/3rd or 1/4th of a novel material price, greatly reduces the production cost of fertilizer, and coated release-controlled urea can be applied on field crop.
Description of drawings
Fig. 1 is the production scheme of coated release-controlled urea.
Embodiment
The preparation of embodiment 1, waste or used plastics coated release-controlled urea
Preparation technology's flow process such as Fig. 1 comprise the steps:
(1) gets in the kautschin solvent that 9 parts of waste polyethylenes join 100 parts, in reactor (dissolving tank) 6, be heated to 140 ℃ and make the waste polyethylene dissolving, form covering liquid;
(2) get 2 parts of talcum powder and join in the reactor 6, stir evenly with stirrer;
(3) getting 125 parts of particle diameters is that 1.5 millimeters ± 0.3 millimeter granular urea adds from charging opening 4, and the wind that produces with gas blower 1 is heated to 110 ℃ with the urea picking-up by well heater 2, circulates;
(4) covering liquid is pressurizeed through pressure pump 5, spray to urea surface by nozzle 7, with hot blast solvent is dried simultaneously, form one deck plastic film at particle surface, solvent is by condenser 8 recyclings;
(5) urea of wrapping is emitted in shutdown, and cooling obtains coated controlled-release urea fertilizer provided by the invention, and the coating rate is 8.09%.
Leave standstill the testing method of soaking test portion according to 25 ℃ of waters among the GB/T23348-2009 and test, recording in this coated carbamide nitrogen nutrient, to discharge 80% used fate be 90d.
The preparation of embodiment 2, waste or used plastics coated release-controlled urea
According to preparing coated release-controlled urea with embodiment 1 identical step, only do following change: with waste polyethylene: talcum powder: the ratio of weight and number of urea and kautschin changes 9: 2: 125 into: 100, the heating for dissolving temperature is 150 ℃, obtains the coating rate at last and be 8.09% coated release-controlled urea.
Leave standstill the testing method of soaking test portion according to 25 ℃ of waters among the GB/T23348-2009 and test, recording in this coated carbamide nitrogen nutrient, to discharge 80% used fate be 80d.
The preparation of embodiment 3, waste or used plastics coated release-controlled urea
According to preparing coated release-controlled urea with embodiment 1 identical step, only do following change: get waste polyethylene: waste and old polystyrol: talcum powder: the ratio of weight and number of urea and kautschin changes 8: 3: 2 into: 125: 100, the heating for dissolving temperature is 150 ℃, obtains the coating rate at last and be 9.42% coated release-controlled urea.
Leave standstill the testing method of soaking test portion according to 25 ℃ of waters among the GB/T23348-2009 and test, recording in this coated carbamide nitrogen nutrient, to discharge 80% used fate be 120d.
The preparation of embodiment 4, waste or used plastics coated release-controlled urea
According to preparing coated release-controlled urea with embodiment 1 identical step, only do following change: with waste and old polypropylene: waste and old polystyrol: talcum powder: the ratio of weight and number of urea and kautschin changes 8: 3: 0.5 into: 125: 100, the heating for dissolving temperature is 150 ℃, obtains the coating rate at last and be 8.42% coated release-controlled urea.
Leave standstill the testing method of soaking test portion according to 25 ℃ of waters among the GB/T23348-2009 and test, recording in this coated carbamide nitrogen nutrient, to discharge 80% used fate be 90d.
The preparation of embodiment 5, waste or used plastics coated release-controlled urea
According to preparing coated release-controlled urea with embodiment 1 identical step, only do following change: with waste polyethylene: waste and old polypropylene: waste and old polystyrol: talcum powder: the ratio of weight and number of urea and kautschin changes 6: 6: 3 into: 3: 125: 100, the heating for dissolving temperature is 150 ℃, obtains the coating rate at last and be 12.59% coated release-controlled urea.
Leave standstill the testing method of soaking test portion according to 25 ℃ of waters among the GB/T23348-2009 and test, recording in this coated carbamide nitrogen nutrient, to discharge 80% used fate be 200d.
The preparation of embodiment 6, waste or used plastics coated release-controlled urea
According to preparing coated release-controlled urea with embodiment 1 identical step, only do following change: with waste polyethylene: waste and old polypropylene: waste and old polystyrol: talcum powder: the ratio of weight and number of urea and kautschin changes 1.5: 1.5: 0.5 into: 0.5: 125: 100, the heating for dissolving temperature is 145 ℃, obtains the coating rate at last and be 3.10% coated release-controlled urea.
Leave standstill the testing method of soaking test portion according to 25 ℃ of waters among the GB/T23348-2009 and test, recording in this coated carbamide nitrogen nutrient, to discharge 80% used fate be 30d.
The preparation of embodiment 7, waste or used plastics coated release-controlled urea
According to preparing coated release-controlled urea with embodiment 1 identical step, only do following change: with waste polyethylene: waste and old polypropylene: waste and old polystyrol: talcum powder: the ratio of weight and number of urea and kautschin changes 4: 4: 2 into: 1.5: 125: 100, the heating for dissolving temperature is 150 ℃, obtains the coating rate at last and be 8.26% coated release-controlled urea.
Leave standstill the testing method of soaking test portion according to 25 ℃ of waters among the GB/T23348-2009 and test, recording in this coated carbamide nitrogen nutrient, to discharge 80% used fate be 60d.
The foregoing description 1-7 is prepared the gained coated release-controlled urea adopt that 25 ℃ of waters leave standstill the testing method of soaking test portion among the GB/T23348-2009, measure the dissolution rate of fertilizer, the result is as shown in table 1.
The solubility rate of table 1, coated carbamide (%)
| Sample | 1d nitrogen nutrient accumulative total release rate (%) | 3d nitrogen nutrient accumulative total release rate (%) | 7d nitrogen nutrient accumulative total release rate (%) | 30d nitrogen nutrient accumulative total release rate (%) | 60d nitrogen nutrient accumulative total release rate (%) | 80d nitrogen nutrient accumulative total release rate (%) | 90d nitrogen nutrient accumulative total release rate (%) | 120d nitrogen nutrient accumulative total release rate (%) | 200d nitrogen nutrient accumulative total release rate (%) |
| ??1 | ??2.21 | ??5.58 | ??7.36 | ??51.12 | ??60.11 | ??71.33 | ??79.45 | ??- | ??- |
| ??2 | ??1.52 | ??3.61 | ??7.34 | ??32.61 | ??58.47 | ??80.23 | ??- | ??- | ??- |
| ??3 | ??1.11 | ??2.53 | ??5.69 | ??20.21 | ??42.31 | ??53.36 | ??61.37 | ??81.20 | ??- |
| ??4 | ??1.01 | ??3.69 | ??8.56 | ??30.54 | ??55.98 | ??74.36 | ??81.20 | ??- | ??- |
| Sample | 1d nitrogen nutrient accumulative total release rate (%) | 3d nitrogen nutrient accumulative total release rate (%) | 7d nitrogen nutrient accumulative total release rate (%) | 30d nitrogen nutrient accumulative total release rate (%) | 60d nitrogen nutrient accumulative total release rate (%) | 80d nitrogen nutrient accumulative total release rate (%) | 90d nitrogen nutrient accumulative total release rate (%) | 120d nitrogen nutrient accumulative total release rate (%) | 200d nitrogen nutrient accumulative total release rate (%) |
| ??5 | ??0.51 | ??1.32 | ??3.56 | ??13.69 | ??26.87 | ??35.21 | ??38.98 | ??51.36 | ??80.31 |
| ??6 | ??4.21 | ??9.54 | ??19.97 | ??79.56 | ??- | ??- | ??- | ??- | ??- |
| ??7 | ??2.36 | ??4.69 | ??10.56 | ??43.69 | ??80.37 | ??- | ??- | ??- | ??- |
As shown in Table 1, coated release-controlled urea provided by the invention can be controlled the release of nitrogen nutrient well, and is respond well.
Claims (10)
1. a method of producing coated release-controlled urea comprises the steps: the coated fertilizer heating for dissolving is formed covering liquid in organic solvent, will be sprayed on urea surface behind described covering liquid and the talcum powder mixing then, and drying obtains described coated release-controlled urea; It is characterized in that: described organic solvent is a kautschin.
2. method according to claim 1 is characterized in that: the ratio of weight and number of described coated fertilizer and described kautschin is 3-18: 100, and any one in the preferred following ratio a-ratio 1:
Ratio a:9: 100,
Ratio b:11: 100,
Ratio c:12: 100,
Ratio d:3.5: 100,
Ratio e:10: 100,
Ratio f:3.5-9: 100,
Ratio g:3.5-10: 100,
Ratio h:3.5-11: 100,
Ratio i:3.5-12: 100,
Ratio j:10-12: 100,
Ratio k:10-11: 100,
Ratio l:11-12: 100.
3. method according to claim 1 and 2 is characterized in that: in the described dissolving step, temperature is 140-150 ℃, preferred 145 ℃.
4. according to the arbitrary described method of claim 1-3, it is characterized in that: the ratio of weight and number of described urea and described kautschin is 110-130: 100, and preferred 125: 100.
5. according to the arbitrary described method of claim 1-4, it is characterized in that: described coated fertilizer is a waste or used plastics.
6. method according to claim 5 is characterized in that: described waste or used plastics is selected from any one among the following material a-material f:
Material a: waste polyethylene;
Material b: waste and old polypropylene,
Material c: the mixture of waste polyethylene and waste and old polypropylene,
Material d: the mixture of waste polyethylene and waste and old polystyrol,
Material e: the mixture of waste and old polypropylene and waste and old polystyrol,
Material f: the mixture of waste polyethylene, waste and old polypropylene and waste and old polystyrol.
7. method according to claim 6 is characterized in that: among the described material d, the ratio of weight and number of described waste polyethylene and waste and old polystyrol is 8: 3;
Among the described material e, the ratio of weight and number of described waste and old polypropylene and described waste and old polystyrol is 8: 3;
Among the described material f, the ratio of weight and number of described waste polyethylene, described waste and old polypropylene and described waste and old polystyrol is selected from any one in following component I-component III:
Component I: 6: 6: 3, component I I:1.5: 1.5: 0.5, component III: 4: 4: 2.
8. according to the arbitrary described method of claim 1-7, it is characterized in that: the ratio of weight and number of described talcum powder and described kautschin is 0.5-3: 100, and preferred 1.25: 100.
9. according to the arbitrary described method of claim 1-8, it is characterized in that: the particle diameter of described urea is the 0.5-5 millimeter.
10. the coated release-controlled urea for preparing of the arbitrary described method of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101121607A CN101774867B (en) | 2010-02-11 | 2010-02-11 | Enveloping controlled release urea and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101121607A CN101774867B (en) | 2010-02-11 | 2010-02-11 | Enveloping controlled release urea and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101774867A true CN101774867A (en) | 2010-07-14 |
| CN101774867B CN101774867B (en) | 2013-06-05 |
Family
ID=42511487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101121607A Active CN101774867B (en) | 2010-02-11 | 2010-02-11 | Enveloping controlled release urea and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101774867B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103449939A (en) * | 2013-08-29 | 2013-12-18 | 山东华垦化肥进出口有限公司 | Thermoplastic resin coated fertilizer and preparation method and coating material thereof |
| CN104402658A (en) * | 2014-11-28 | 2015-03-11 | 钢铁研究总院 | Method for preparing organic coated controlled release urea from blast furnace slag |
-
2010
- 2010-02-11 CN CN2010101121607A patent/CN101774867B/en active Active
Non-Patent Citations (5)
| Title |
|---|
| 刘宝存等: "新型可调控S型缓释肥料研制与开发 ", 《中国农资》 * |
| 刘宝存等: "新型可调控S型缓释肥料研制与开发", 《中国农资》, no. 10, 20 August 2006 (2006-08-20) * |
| 李东坡等: "醋酸酯淀粉膜材料及其包膜尿素肥料制备", 《辽宁工程技术大学学报(自然科学版)》 * |
| 王小利等: "包膜控释肥料氮素释放动力学研究 ", 《西北农林科技大学学报(自然科学版)》 * |
| 王小利等: "包膜控释肥料氮素释放动力学研究", 《西北农林科技大学学报(自然科学版)》, no. 05, 25 October 2003 (2003-10-25) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103449939A (en) * | 2013-08-29 | 2013-12-18 | 山东华垦化肥进出口有限公司 | Thermoplastic resin coated fertilizer and preparation method and coating material thereof |
| CN104402658A (en) * | 2014-11-28 | 2015-03-11 | 钢铁研究总院 | Method for preparing organic coated controlled release urea from blast furnace slag |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101774867B (en) | 2013-06-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20110165324A1 (en) | Method for Manufacturing Ecotypic Artificial Leather or Leather-like and Automated Manufacturing Line Thereof | |
| CN101200400A (en) | Acetic ester coated controlled-release urea fertilizer and preparation technique | |
| CN102167647A (en) | Degradable composite coating material and preparation method and application thereof in controlled release fertilizer | |
| CN106046725A (en) | High-barrier-property biodegradable mulching film and preparation method thereof | |
| CN101200399A (en) | Resin film coated controlled-release fertilizer and preparation method | |
| CN103910577B (en) | Slowly-soluble fertilizer and preparation method thereof | |
| CN101774867B (en) | Enveloping controlled release urea and production method thereof | |
| CN104710213A (en) | Rounded grain potash fertilizer production method | |
| CN102154016A (en) | Liquid mulching film and producing and film forming methods | |
| CN104744817A (en) | High-concentration anti-electrostatic master batch and preparation method thereof | |
| CN102718988B (en) | Polybutylece terephthalate (PBT) coated functional powder and preparation method thereof | |
| CN207862224U (en) | A kind of fertilizer coating process units colouring anti-dusting effect with moisture-proof sustained release anti-caking | |
| CN104311956A (en) | Moisture-absorbing thin film material for anti-caking package of citric acid | |
| CN106467656A (en) | A kind of 3D printing PLA wood plastic composite and preparation method thereof | |
| CN104387213A (en) | Biodegradable controlled-release coated urea and preparation method thereof | |
| CN100358939C (en) | Method for preparing powder of nylon | |
| CN102618189B (en) | Novel polymer solid slow-release glue | |
| CN1800117A (en) | Method for producing macromolecule control-release dressing fertilizer | |
| CN110643062A (en) | Colored TPU (thermoplastic polyurethane) foamed bead as well as preparation method and application thereof | |
| CN206494886U (en) | A kind of production equipment of PVDF fluorocarbon powder paints | |
| CN107964128A (en) | A kind of method for efficiently preparing the thermoplastic starch for biodegradable plastic | |
| CN109208111A (en) | A kind of polyvinyl alcohol melt spinning fire resistance fibre and preparation method thereof | |
| CN101270010B (en) | Fertilizer control release clothing sheet | |
| CN113563703A (en) | Production process of degradable color master batch | |
| CN103866646B (en) | A kind of technique of producing without ketone transfer paperboard |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |