CN102276348A - Degradable controlled release film and method for producing degradable controlled release film slow release fertilizer - Google Patents
Degradable controlled release film and method for producing degradable controlled release film slow release fertilizer Download PDFInfo
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- CN102276348A CN102276348A CN2011101466490A CN201110146649A CN102276348A CN 102276348 A CN102276348 A CN 102276348A CN 2011101466490 A CN2011101466490 A CN 2011101466490A CN 201110146649 A CN201110146649 A CN 201110146649A CN 102276348 A CN102276348 A CN 102276348A
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Abstract
The invention discloses a degradable controlled release film and a method for producing a degradable controlled release film slow release fertilizer. The degradable controlled release film is characterized by being prepared from 50-70% by weight of low molecular polyethylene wax, 10-30% by weight of polyvinyl resin and 20-40% by weight of polylactic resin. The method for producing the degradable controlled release film slow release fertilizer comprises the following steps of: (a) heating the commercial low molecular polyethylene wax to 110-125 DEG C to form molten liquid polyethylene wax (served as a solvent) with lower viscosity; and (b) after mixing a certain amount of the polyvinyl resin and biodegradable polylactic resin, adding into the molten polyethylene wax solution, after sufficiently stirring and mixing, spraying on the surface of a large granule fertilizer which is heated to 40 DEG C, and, after cooling, forming the controlled release fertilizer with different controlled release periods and controlled release properties and good performance.
Description
Technical field
The present invention relates to a kind of sustained-controll-release fertiliser and production method thereof, relate in particular to the production method of a kind of degradable release-controlled film and degradable release-controlled film slow release fertilizer.
Background technology
At present, the film-coated controlled release fertilizer type mainly contains inorganics coated fertilizer and high polymer film-coated fertilizer two big classes both at home and abroad.The film-coated controlled release fertilizer that wherein with the organic polymer is the film material more and more receives an acclaim, mainly be because organic high molecular polymer can be evenly distributed in the fertiliser granulates surface, and the micropore in the coated fertilizer can play sustained release effect preferably to fertilizer nutrient, can not cause disruptiveness to discharge, can directly contact and use saving of work and time with seed or the disposable full dose of crop root.But when utilizing general organic high molecular polymer to carry out coating for coated fertilizer, also have following shortcoming: most applications must be used the organic solvent dissolution high molecular polymer, could spray coating after forming coating solution, so just need reclaim solvent, reclaim incomplete solvent meeting polluted air, not environmental protection; Most high molecular polymer because molecular weight is big, complex structure, is difficult in degraded in soil, and for example polyethylene approximately needs ability degraded in 100 years in soil, also has the possibility of contaminated soil; The price of most of high molecular polymers is higher, causes the production cost height of film-coated controlled release fertilizer, and therefore most of resin coated controlled release fertilizers just are applied in aspects such as flowers and high-grade garden crop, is difficult to apply to field crop.
Summary of the invention
The objective of the invention is to provide a kind of degradable coated fertilizer prescription that does not need additionally to add organic solvent in order to overcome the deficiencies in the prior art, mould material in this prescription is melting after heating, cooling back curable film-forming, simultaneously, production technique is simple, the equipment less investment, production cost is low, helps the large-scale industrial production film-coated controlled release fertilizer.Its concrete technical scheme is:
The prescription of degradable release-controlled film is: the interpolation weight ratio of low-molecular polyethylene wax is 50-70%, polyvinyl resin 10-30%, polylactic resin 20-40%.
The production method of degradable release-controlled film slow release fertilizer is:
A, commercially available low molecular weight polyethylene wax is heated to 110 ℃-125 ℃, can the lower fused solution polyethylene wax (can be used as solvent uses) of shape viscosity;
B, will join after a certain amount of polyvinyl resin and the Biodegradable polylactic acids mixed with resin in the fused polyethylene wax solution, behind abundant stirring and evenly mixing, it is sprayed to the surface of big the fertilizer that is preheating to 40 ℃, can form the release and release control fertilizer of excellent property after the cooling.
The optimum range of said spraying coating solution is 110-125 ℃, and the optimal pressure range of spraying coating solution is 10-15Mpa.
The coated fertilizer that said bag is coated with accounts for the 3%-10% of release and release control fertilizer gross weight.
Regulate low ratio of dividing polyethylene wax and polyethylene and poly(lactic acid) in the coated fertilizer prescription, can make the film-coated controlled release fertilizer of different controlled release phases and controlled release characteristics.
From technical scheme of the present invention as can be seen, because it is soluble characteristic that the present invention utilizes the polyethylene wax heating, with degradable resin coating material (poly(lactic acid)) and polyethylene wax mixed dissolution, be mixed with coating solution, but high-velocity spray can form film-coated controlled release fertilizer to the surface of fertiliser granulates after the cooling under the fused state.The present invention does not need to add any organic solvent, also solvent-free discharging in the production, not only production unit simple (not needing solvent reclaimer); The polyethylene wax itself that utilizes is exactly a kind of raw material in the coated fertilizer, just becomes molten state after the heating, can be used as solvent and uses, and just is solidified as solid-stately after the cooling, but also can carry out mixing with other coated fertilizer, helps coating; In addition, utilize the main raw of organic matter fermentation synthetic poly(lactic acid), can promote the quick degraded of release and release control fertilizer putamina in soil, meet the requirement of present environmental protection class release and release control fertilizer development for coating.
Through a large amount of evidences, by the heating polyethylene wax, a certain amount of biodegradable resin material of solubilized after the fusion, the coating solution that is mixed with, but high-velocity spray is to the fertiliser granulates surface in fluidized-bed, form the degradable resin coated slow release fertilizer that 2-12 did not wait in individual month, the plant recovery of nutrient of such slow release fertilizer on fruit tree, paddy rice and corn is 1.5-2 times of common fertilizer approximately, if large-area applications, can save a large amount of manure resources, reduce the problems such as pollution of area source that cause because of excessive fertilization.In addition, adopt the putamina of the release and release control fertilizer of this method processing just can degrade fully in 2-3, the final product of degraded is carbonic acid gas and water, emits energy simultaneously, very environmental protection.
Polyethylene wax mixes the back and forms the controlled release putamina with polyethylene and poly(lactic acid), along with the increase of poly(lactic acid) addition, speed of degraded in soil is also just fast more again for it, usually in 2-3 with regard to degradable.Polyethylene and polyethylene wax itself is difficult to degraded, but with after poly(lactic acid) is mixed, mixing and graft-blending phenomenon can take place, and just promoted the degraded of polyethylene and polyethylene wax when poly(lactic acid) is degraded.Its biodegradable dominant mechanism is: under microorganism active (having enzyme to participate in) effect, after enzyme enters the activity site of polymkeric substance and infiltrates into the point of application of polymkeric substance, make polymkeric substance generation hydrolysis reaction, thereby make the polymer macromolecule skeleton structure fragment into little segment, and final fracture becomes stable small molecules product, finish biodegradation process, the eventual degradation product is H
2O and CO
2, do not pollute the environment.
Embodiment
Embodiment 1: with the 50kg low-molecular polyethylene wax, be heated to 120 ℃, adding each 20Kg of polyethylene and poly(lactic acid) and 30Kg respectively after constantly stirring complete fusion, keeping temperature is 110-125 ℃, continues to stir 30 minutes, forms coating solution.Be pressurized to 10-15Mpa in the reactor with coating solution, utilize pressure nozzle with the quick atomizing spraying of coating liquid to being preheating on 40 ℃ the surface of granulated fertilizer of 900Kg.Behind cool to room temperature, can obtain the nutrient controlled release phase and be 12 months release and release control fertilizer.
Embodiment 2: with the 50kg low-molecular polyethylene wax, be heated to 120 ℃, adding each 10Kg of polyethylene and poly(lactic acid) and 40Kg respectively after constantly stirring complete fusion, keeping temperature is 110-125 ℃, continues to stir 30 minutes, forms coating solution.Be pressurized to 10-15Mpa in the reactor with coating solution, utilize pressure nozzle with the quick atomizing spraying of coating liquid to being preheating on 40 ℃ the surface of granulated fertilizer of 900Kg.Behind cool to room temperature, can obtain the nutrient controlled release phase and be 8 months release and release control fertilizer.
Embodiment 3: with the 60kg low-molecular polyethylene wax, be heated to 120 ℃, adding each 20Kg of polyethylene and poly(lactic acid) and 20Kg respectively after constantly stirring complete fusion, keeping temperature is 110-125 ℃, continues to stir 30 minutes, forms coating solution.Be pressurized to 10-15Mpa in the reactor with coating solution, utilize pressure nozzle with the quick atomizing spraying of coating liquid to being preheating on 40 ℃ the surface of granulated fertilizer of 900Kg.Behind cool to room temperature, can obtain the nutrient controlled release phase and be 10 months release and release control fertilizer.
Embodiment 4: with the 25kg low-molecular polyethylene wax, be heated to 120 ℃, adding each 10Kg of polyethylene and poly(lactic acid) and 15Kg respectively after constantly stirring complete fusion, keeping temperature is 110-125 ℃, continues to stir 30 minutes, forms coating solution.Be pressurized to 10-15Mpa in the reactor with coating solution, utilize pressure nozzle with the quick atomizing spraying of coating liquid to being preheating on 40 ℃ the surface of granulated fertilizer of 950Kg.Behind cool to room temperature, can obtain the nutrient controlled release phase and be 3 months release and release control fertilizer.
Embodiment 5: with the 30kg low-molecular polyethylene wax, be heated to 120 ℃, adding each 5Kg of polyethylene and poly(lactic acid) and 10Kg respectively after constantly stirring complete fusion, keeping temperature is 110-125 ℃, continues to stir 30 minutes, forms coating solution.Be pressurized to 10-15Mpa in the reactor with coating solution, utilize pressure nozzle with the quick atomizing spraying of coating liquid to being preheating on 40 ℃ the surface of granulated fertilizer of 950Kg.Behind cool to room temperature, can obtain the nutrient controlled release phase and be 2 months release and release control fertilizer.
Claims (4)
1. a degradable release-controlled film is characterized in that: press the preparation of column weight amount per-cent, low-molecular polyethylene wax 50-70%, polyvinyl resin 10-30%, polylactic resin 20-40%.
2. the production method of a degradable release-controlled film slow release fertilizer is characterized in that: follow these steps to carry out
(a) commercially available low molecular weight polyethylene wax is heated to 110 ℃-125 ℃, gets final product the lower fused solution polyethylene wax of shape viscosity (can be used as solvent uses);
(b) will join after a certain amount of polyvinyl resin and the Biodegradable polylactic acids mixed with resin in the fused polyethylene wax solution, behind abundant stirring and evenly mixing, it is sprayed to the surface of big the fertilizer that is preheating to 40 ℃, can form the release and release control fertilizer of excellent property after the cooling.
3. the production method of a kind of degradable release-controlled film slow release fertilizer according to claim 2 is characterized in that: the temperature of spraying coating solution is 110-125 ℃, and the pressure of spraying coating solution is 10-15Mpa.
4. the production method of a kind of degradable release-controlled film slow release fertilizer according to claim 2 is characterized in that: the coated fertilizer that bag is coated with accounts for the 3%-10% of release and release control fertilizer gross weight.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110146649.0A CN102276348B (en) | 2011-05-30 | 2011-05-30 | Degradable controlled release film and method for producing degradable controlled release film slow release fertilizer |
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| CN201110146649.0A CN102276348B (en) | 2011-05-30 | 2011-05-30 | Degradable controlled release film and method for producing degradable controlled release film slow release fertilizer |
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| CN102276348A true CN102276348A (en) | 2011-12-14 |
| CN102276348B CN102276348B (en) | 2014-03-12 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105315062A (en) * | 2014-08-05 | 2016-02-10 | 中化山东肥业有限公司 | Preparation method for biological-optical difunctional degradable slow-releasing membrane for fertilizer |
| CN106007894A (en) * | 2016-05-10 | 2016-10-12 | 安徽金帝豪肥业有限公司 | Release control method for peanut slow release fertilizer |
| CN106234421A (en) * | 2016-08-31 | 2016-12-21 | 山东胜伟园林科技有限公司 | A kind of root-growing agent containing Cortex Magnoliae Officinalis extract and preparation method thereof |
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| US5645624A (en) * | 1993-07-21 | 1997-07-08 | Asahi Kasei Kogyo Kabushiki Kaisha | Granular fertilizer with a multilayer coating |
| CN101735636A (en) * | 2008-11-12 | 2010-06-16 | 福建恒安集团有限公司 | Biodegradation time controlled plastic film and preparation method thereof |
| CN101798403A (en) * | 2010-03-30 | 2010-08-11 | 东华大学 | Method for preparing chitosan/polyving alcohol/polylactic acid blended dense membrane |
| CN102060564A (en) * | 2010-11-16 | 2011-05-18 | 成都新柯力化工科技有限公司 | Light-weight environmental-friendly stone paper and preparation method thereof |
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2011
- 2011-05-30 CN CN201110146649.0A patent/CN102276348B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5645624A (en) * | 1993-07-21 | 1997-07-08 | Asahi Kasei Kogyo Kabushiki Kaisha | Granular fertilizer with a multilayer coating |
| CN101735636A (en) * | 2008-11-12 | 2010-06-16 | 福建恒安集团有限公司 | Biodegradation time controlled plastic film and preparation method thereof |
| CN101798403A (en) * | 2010-03-30 | 2010-08-11 | 东华大学 | Method for preparing chitosan/polyving alcohol/polylactic acid blended dense membrane |
| CN102060564A (en) * | 2010-11-16 | 2011-05-18 | 成都新柯力化工科技有限公司 | Light-weight environmental-friendly stone paper and preparation method thereof |
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| 王华林等: "聚乳酸/聚乙烯醇共混膜的制备", 《高分子材料科学与工程》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105315062A (en) * | 2014-08-05 | 2016-02-10 | 中化山东肥业有限公司 | Preparation method for biological-optical difunctional degradable slow-releasing membrane for fertilizer |
| CN106007894A (en) * | 2016-05-10 | 2016-10-12 | 安徽金帝豪肥业有限公司 | Release control method for peanut slow release fertilizer |
| CN106234421A (en) * | 2016-08-31 | 2016-12-21 | 山东胜伟园林科技有限公司 | A kind of root-growing agent containing Cortex Magnoliae Officinalis extract and preparation method thereof |
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| CN102276348B (en) | 2014-03-12 |
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