CN108530193A - A kind of preprocess method of the fat core of polyurethane coated controlled-release - Google Patents
A kind of preprocess method of the fat core of polyurethane coated controlled-release Download PDFInfo
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- CN108530193A CN108530193A CN201810643734.XA CN201810643734A CN108530193A CN 108530193 A CN108530193 A CN 108530193A CN 201810643734 A CN201810643734 A CN 201810643734A CN 108530193 A CN108530193 A CN 108530193A
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- Prior art keywords
- core
- release
- fertile
- preprocess method
- polyurethane coated
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- 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.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
- C05D1/02—Manufacture from potassium chloride or sulfate or double or mixed salts thereof
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/90—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting the nitrification of ammonium compounds or urea in the soil
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
- C05G5/37—Layered or coated, e.g. dust-preventing coatings layered or coated with a polymer
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Soil Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Fertilizers (AREA)
Abstract
Technical solution of the present invention discloses a kind of preprocess method of the fat core of polyurethane coated controlled-release, includes the following steps：S1：Configure coating fluid；S2：The fertile core of preheating is to 40 DEG C~60 DEG C；S3：The S1 coating fluids configured are spread evenly across the fertile wicking surface after preheating and form liquid film；S4：Fertile core obtained by S3 is recrystallized successively, is dried, if obtained fertile core is in bright, round and smooth and hard state, completes to pre-process；Otherwise, step S3 and S4 is repeated to fertile core in bright, round and smooth and hard state.The preprocess method for the fat core of polyurethane coated controlled-release that technical solution of the present invention provides can extend the deenergized period of fertilizer, while can increase substantially production efficiency.
Description
Technical field
The present invention relates to release and release control fertilizer fertilizer core processing technique field more particularly to a kind of fat cores of polyurethane coated controlled-release
Preprocess method.
Background technology
Current controlled release fertilizer has been to be concerned by more and more people, and compared with common fertilizer, release and release control fertilizer utilization rate is high, volume increase
With obvious effects, Controlled Release Fertilizer is used for a long time in time saving and energy saving liberation labour, thus it is possible to vary soil texture makes that the soil is porous.
Controlled Release Fertilizer is to be coated with organic coating liquid thereon using conventional fertilizers particle as core, reacts at a certain temperature, is cold
But, cure.The primary according to the release rate for being initial stage nutrient of release and release control fertilizer release performance is judged, to reduce initial stage release rate, one
As the measure taken be to increase coating quantity, when but not only increasing production cost in this way, but also extending the degradation of coated fertilizer
Between, therefore existing method is pre-processed to fertile core, to reduce production cost.The fertiliser granulates surface base of plant produced
All it is uneven in sheet, particle varies, and color and luster is partially dark, if pre-processed to fertiliser granulates, makes fertiliser granulates table
Face is round and smooth bright, so that it may reduce coating rate to reach, extend the deenergized period of fertilizer, reduce the purpose of production cost.
CN10138263A refers to a kind of method processing fertiliser granulates using physically screening, and fertilizer is after screening
Into polishing machine, polishing is bright, and to reduce production cost, but production efficiency is too low, increases time cost.
CN101659583A is related to a kind of post-processing approach of granulated fertilizer, and fertiliser granulates are placed in rotary drum and are preheated, and urea water is added
Solution or aqueous ammonium nitrate solution are coating fluid, fertiliser granulates surface can be made mellow and full smooth after dry, compare physically screening, this side
Method effect is more preferable.CN107840682A relates to a kind of improved granular urea resurfacing technology, and coating fluid is certain dense
The aqueous solution of urea or urea-formaldehyde aqueous solution or urea ureaformaldehyde aqueous solution of degree can equally make particle surface after drying
It is smooth, reduce production cost.CN101659583A and CN101740682A is mentioned rotates fertiliser granulates in rotary drum, and base is added
Body aqueous solution, the part protruded are softened by the effect of outer friction power, are dissolved in coating fluid, and after dry, solute is tied again
Crystalline substance fills up depressed portions.Although this method can reduce production cost, there is the problem of the following aspects：First,
During industrial big production, the surface treatment of fertilizer core per ton will consume 3.85m3Natural gas causes a large amount of consumption of the energy；Its
Two, polyurethane coated controlled-release fertilizer is mostly directly reacted with reactants such as vegetable oil polyol and isocyanates in fertiliser granulates surface
Be prepared, if fertile core degree of drying is inadequate, then a large amount of OH will be introduced in system, destroy the proportioning of NCO/OH, NCO with
CO is released in water reaction2Hole is formed, the release rate of fertilizer can be caused to increase, and a small amount of water can destroy this proportioning.
Invention content
The technical problem to be solved is that provide a kind of pre- place of the fat core of polyurethane coated controlled-release for technical solution of the present invention
Reason method can extend the deenergized period of fertilizer.
In order to solve the above technical problems, technical solution of the present invention provides a kind of pre- place of the fat core of polyurethane coated controlled-release
Reason method, includes the following steps：
S1：Configure coating fluid；
S2：The fertile core of preheating is to 40 DEG C~60 DEG C；
S3：The S1 coating fluids configured are spread evenly across the fertile wicking surface after preheating and form liquid film；
S4：Fertile core obtained by S3 is recrystallized successively, is dried, if obtained fertile core is in bright, round and smooth and hard shape
State is then completed to pre-process；Otherwise, step S3 and S4 is repeated to fertile core in bright, round and smooth and hard state.
The number of repetition of step S4 is not construed as limiting, as the case may be depending on, as long as keep particle surface shinny and it is mellow and full,
There is no corner angle, that is, completes pretreatment operation.
Optionally, step S1 is specially：A certain amount of polyacrylamide emulsion is weighed, certain proportioning is added thereto successively
Absolute ethyl alcohol, the microcrystalline wax after fertile core matrix and preheating and stir evenly, wherein fertile core matrix be the fertile core after crushing.
Optionally, the mass fraction that the anionic polyacrylamide emulsion accounts for coating fluid is 3%~5%, preferably 3%
~4%, the mass fraction that the microcrystalline wax accounts for coating fluid is 2%~5%, preferably 2%~4%, and the fertilizer core matrix accounts for
The mass fraction of coating fluid is 40%~60%.
Optionally, the anionic polyacrylamide emulsion is water-in-oil type, and anion degree is 20%~40%, molecule
Amount is 12,000,000~20,000,000.
Optionally, the fusing point of the microcrystalline wax is 40 DEG C~50 DEG C.
Optionally, in step s 2, fertile core is preheated in the following way：Fertile core is placed in deflector and heats air hose
In comet formula sugar coating machine, rotating cylinder drives fertile core flowing.
Optionally, step S3 is specially：Coating fluid is at the uniform velocity added dropwise in fertile wicking surface, coating fluid is made to be dispersed in fertile core
Surface forms liquid film.The part of fertile wicking surface protrusion can polish during rotating drum, and that grinds off is partially dissolved in coating
In liquid.
Optionally, the coating fluid accounts for the 0.5%~5.0% of fertile core gross mass.Preferably 2.0%~4.0%.
Optionally, after coating fluid being added dropwise, maintain temperature at 45 DEG C~55 DEG C, 5 minutes~stopping heating after ten minutes of rotation.
Optionally, in step s3, using heated-air drying, hot blast temperature is 80 DEG C~100 DEG C, and the duration is 10 minutes
~15 minutes.
Optionally, the fertile core can be existing all fertiliser granulates, such as urea granules, granular potassium sulfate, composite fertilizer
Grain etc..
Compared with prior art, the preprocess method of the fat core of the controlled release of technical solution of the present invention has the following advantages：
(1) coating fluid of technical solution of the present invention is approximately non-aqueous system, avoids the introducing of a large amount of OH, maintains NCO/
The stabilization of OH proportionings；
(2) compared with prior art, due to containing absolute ethyl alcohol in system, absolute ethyl alcohol spontaneous can take away body in evaporation
Moisture in system reduces the dry time needed, has saved the time, improved production efficiency；
(3) contain anionic polyacrylamide in coating fluid, other than having the function of flocculation, thickening, bonding, it is also
It is a kind of excellent water-loss reducer of soil, plays the role of reducing soil moisture evaporation；
(4) the coating fluid usage amount of technical solution of the present invention is less, environmentally friendly.
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
Description of the drawings
Fig. 1 is the nutrient release curve figure of urea granules.
Specific implementation mode
Embodiment 1：It is coated with urea granules
1, the configuration of coating fluid：Weigh 0.6g anion-polyacrylamides lotion (anion degree 30%；Molecular weight is
1500 ten thousand), the granular urea and preheated by 0.6g that addition 6.3g absolute ethyl alcohols, 7.5g pass through after crushing thereto successively
Fusing point later be 46 DEG C microcrystalline wax and stir evenly.
2, the pretreatment of fertile core：The urea granules that 1kg grain sizes are 2mm-4mm are weighed, are added into Chufa-type sugarcoating machine
And preheated at 40 DEG C, fertilizer surface temperature is tested with infrared radiation thermometer, it is when reaching 40 DEG C, 15g coating fluids is slow
It drops evenly on urea granules surface, persistently rotates 5 minutes, after being recrystallized, be passed through 80 DEG C of hot winds, continue 5 minutes.It repeats
Coating, recrystallization, dry step twice, last natural cooling, discharging, it is observed that particle surface it is shinny and mellow and full,
There is no corner angle.
Embodiment 2：It is coated with granular potassium sulfate
1, the configuration of coating fluid：Weigh 0.6g anion-polyacrylamides lotion (anion degree 20%；Molecular weight is
1800 ten thousand), the granular potassium sulfate and preheated by 0.6g that addition 6.3g absolute ethyl alcohols, 7.5g pass through after crushing thereto successively
Fusing point later be 46 DEG C microcrystalline wax and stir evenly.
2, the pretreatment of fertile core：It is 2mm-4mm granular potassium sulfates to weigh 1kg grain sizes, is added into Chufa-type sugarcoating machine
And preheated at 40 DEG C, fertilizer surface temperature is tested with infrared radiation thermometer, it is when reaching 40 DEG C, 15g coating fluids is slow
It drops evenly on granular potassium sulfate surface, persistently rotates 10 minutes, after being recrystallized, be passed through 80 DEG C of hot winds, continue 5 minutes.
It is repeated two more times, last natural cooling, discharges by above-mentioned steps, it is observed that particle surface is shinny and mellow and full, does not have rib
Angle.
Embodiment 3：It is coated with the composite fertilizer of 15-15-15
The present embodiment illustratively carries out experimental verification by taking the 15-15-15 composite fertilizers of western Shandong Chemical Manufacture as an example：
1, the configuration of coating fluid：Weigh 0.6g anion-polyacrylamides lotion (anion degree 40%；Molecular weight is
1200 ten thousand), and 6.3g absolute ethyl alcohols, the composite fertilizer of 15-15-15s of the 7.5g after crushing and 0.6g preheatings is added thereto successively
Fusing point later is 46 DEG C of microcrystalline waxes and stirs evenly.
2, the pretreatment of fertile core：The 15-15-15 western Shandong chemical industry composite fertilizer that 1kg grain sizes are 2mm-4mm is weighed, is added into
It is preheated in Chufa-type sugarcoating machine and at 40 DEG C, fertilizer surface temperature is tested with infrared radiation thermometer, it, will when reaching 40 DEG C
15g coating fluids slowly drop evenly on 15-15-15 composite fertilizers surface, persistently rotate 10 minutes, after being recrystallized, are passed through 80
DEG C hot wind, continues 5 minutes.Be repeated two more times by above-mentioned steps, last natural cooling, discharge, can obtain surface it is shinny and
Mellow and full, not corner angle composite fertilizers.
Embodiment 4：Prepare polyurethane coated controlled-release urea
The urea granules prepared by 1kg embodiments 1 are weighed as fertile core, is added into Chufa-type sugarcoating machine, is opened and add
Hot button, setting temperature tests fertile wicking surface temperature at 70 DEG C, with infrared radiation thermometer will be preheated to 80 DEG C when reaching 70 DEG C
8.22g isocyanates, 6.21g soybean oils be slowly added dropwise to fertile wicking surface simultaneously, the second layer is added dropwise again after 5 minutes, drips
Postcooling curing material is added, polyurethane coated controlled-release urea is just obtained.
Using release and release control fertilizer industry relevant criterion, HG/T 4215-2011 carry out the test of nutrient release rate, make urea
The nutrient release curve (such as Fig. 1) of particle finds that it is 80 days not carry out the pretreated coating nutrients release period, is pre-processed
The nutrients release period of gained coated carbamide is 100 days afterwards, it can be seen that, can by being pre-processed to urea granules surface
It is obviously prolonged the deenergized period of fertilizer.
Specific embodiments of the present invention described in detail above, it should be understood that those skilled in the art are without wound
The property made labour, which according to the present invention can conceive, makes many modifications and variations.Therefore, all technician in the art
Pass through the available technology of logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Scheme, all should be in the protection domain being defined in the patent claims.
Claims (10)
1. a kind of preprocess method of the fat core of polyurethane coated controlled-release, which is characterized in that include the following steps：
S1：Configure coating fluid；
S2：The fertile core of preheating is to 40 DEG C~60 DEG C；
S3：The S1 coating fluids configured are spread evenly across the fertile wicking surface after preheating and form liquid film；
S4：Fertile core obtained by S3 is recrystallized successively, is dried, if obtained fertile core is in bright, round and smooth and hard state,
Complete pretreatment；Otherwise, step S3 and S4 is repeated to fertile core in bright, round and smooth and hard state.
2. the preprocess method of the fat core of polyurethane coated controlled-release as described in claim 1, which is characterized in that step S1 is specific
For：A certain amount of polyacrylamide emulsion is weighed, the absolute ethyl alcohol centainly matched, fertile core matrix and preheating is added thereto successively
Rear microcrystalline wax simultaneously stirs evenly, and the fertilizer core matrix be the fertile core after smashing.
3. the preprocess method of the fat core of polyurethane coated controlled-release as claimed in claim 2, which is characterized in that the anion
The mass fraction that polyacrylamide emulsion accounts for coating fluid is 3%~5%, and the mass fraction that the microcrystalline wax accounts for coating fluid is
2%~5%, the mass fraction that the fertilizer core matrix accounts for coating fluid is 40%~60%.
4. the preprocess method of the fat core of polyurethane coated controlled-release as claimed in claim 3, which is characterized in that the anion
Polyacrylamide emulsion is water-in-oil type, and anion degree is 20%~40%, and molecular weight is 12,000,000~20,000,000.
5. the preprocess method of the fat core of polyurethane coated controlled-release as claimed in claim 3, which is characterized in that the microlite
The fusing point of wax is 40 DEG C~50 DEG C.
6. the preprocess method of the fat core of polyurethane coated controlled-release as described in claim 1, which is characterized in that in step S2
In, fertile core is preheated in the following way：Fertile core is placed in the Chufa-type sugarcoating machine with deflector and heating air hose, rotating cylinder
Drive fertile core flowing.
7. the preprocess method of the fat core of polyurethane coated controlled-release as claimed in claim 6, which is characterized in that step S3 is specific
For：Coating fluid is at the uniform velocity added dropwise in fertile wicking surface, so that coating fluid is dispersed in fertile wicking surface and forms liquid film.
8. the preprocess method of the fat core of polyurethane coated controlled-release as claimed in claim 7, which is characterized in that the coating fluid
Account for the 0.5%~5.0% of fertile core gross mass.
9. the preprocess method of the fat core of polyurethane coated controlled-release as claimed in claim 7, which is characterized in that coating fluid is added dropwise
Afterwards, maintain temperature at 45 DEG C~55 DEG C, 5 minutes~stopping heating after ten minutes of rotation.
10. the preprocess method of the fat core of polyurethane coated controlled-release as described in claim 1, which is characterized in that in step S3
In, using heated-air drying, hot blast temperature is 80 DEG C~100 DEG C, and the duration is 10 minutes~15 minutes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810643734.XA CN108530193A (en) | 2018-06-21 | 2018-06-21 | A kind of preprocess method of the fat core of polyurethane coated controlled-release |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810643734.XA CN108530193A (en) | 2018-06-21 | 2018-06-21 | A kind of preprocess method of the fat core of polyurethane coated controlled-release |
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| CN108530193A true CN108530193A (en) | 2018-09-14 |
Family
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109438140A (en) * | 2018-11-28 | 2019-03-08 | 上海永通生态工程股份有限公司 | A kind of polyurethane coated calcium ammonium nitrate and its manufacturing method |
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Application publication date: 20180914 |