CN102276348B - 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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- CN102276348B CN102276348B CN201110146649.0A CN201110146649A CN102276348B CN 102276348 B CN102276348 B CN 102276348B CN 201110146649 A CN201110146649 A CN 201110146649A CN 102276348 B CN102276348 B CN 102276348B
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- polyethylene wax
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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, film-coated controlled release fertilizer type mainly contains inorganics coated fertilizer and the large class of high polymer film-coated fertilizer two both at home and abroad.The film-coated controlled release fertilizer that the organic polymer of wherein take is film material more and more receives an acclaim, mainly because organic high molecular polymer can be evenly distributed in fertiliser granulates surface, and the micropore in coated fertilizer can play good control release action to fertilizer nutrient, can not cause disruptiveness to discharge, can directly contact and use with seed or the disposable full dose of crop root, saving of work and time.But while utilizing general organic high molecular polymer to carry out coating for coated fertilizer, also there is following shortcoming: most applications must be used organic solvent dissolution high molecular polymer, after forming coating solution, could spray coating, so just need to reclaim solvent, reclaim incomplete solvent meeting polluted air, not environmental protection; Most high molecular polymer, because molecular weight is large, 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 of film-coated controlled release fertilizer high, and therefore most of resin coated controlled release fertilizers are just applied in the aspects such as flowers and high-grade garden crop, are difficult to apply to field crop.
Summary of the invention
The object of the invention is to provide in order to overcome the deficiencies in the prior art a kind of degradable coated fertilizer formula that does not need additionally to add organic solvent, mould material in this formula is melting after heating, cooling rear curable film-forming, simultaneously, production technique is simple, equipment investment is few, and production cost is low, is conducive to large-scale industrial production film-coated controlled release fertilizer.Its concrete technical scheme is:
The formula 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 after a certain amount of polyvinyl resin and Biodegradable polylactic acids mixed with resin, join in the polyethylene wax solution of melting, after abundant stirring and evenly mixing, sprayed to the surface of large the fertilizer that is preheating to 40 ℃, can be formed the release and release control fertilizer of excellent property after 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.
The ratio of low minute polyethylene wax and polyethylene and poly(lactic acid) in adjustment kit mould material formula, can make the film-coated controlled release fertilizer of different controlled release phases and controlled release characteristics.
From technical scheme of the present invention, can find out, because the present invention utilizes polyethylene wax heating, it is soluble characteristic, by degradable resin coating material (poly(lactic acid)) and polyethylene wax mixed dissolution, be mixed with coating solution, can high-velocity spray under the state of melting to the surface of fertiliser granulates, can form film-coated controlled release fertilizer after cooling.The present invention does not need to add any organic solvent, also solvent-free discharge in production, not only production unit simple (not needing solvent reclaimer); The polyethylene wax itself utilizing is exactly a kind of raw material in coated fertilizer, just becomes molten state after heating, can be used as solvent and uses, and is just solidified as after cooling solid-stately, but also can carry out mixing with other coated fertilizer, is conducive to coating; In addition, utilize the main raw that the synthetic poly(lactic acid) of organic matter fermentation is coating, can promote the fast degradation of release and release control fertilizer putamina in soil, meet the requirement of current environmental protection class release and release control fertilizer development.
Through lot of experiments, prove, by heating polyethylene wax, a certain amount of biodegradable resin material of solubilized after melting, the coating solution being mixed with, can high-velocity spray in fluidized-bed to fertiliser granulates surface, form the degradable resin coated slow release fertilizer not waiting for 2-12 month, the plant recovery of nutrient of such slow release fertilizer on fruit tree, paddy rice and corn is approximately 1.5-2 times of common fertilizer, 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, the putamina of the release and release control fertilizer of employing the method processing just can be degradable in 2-3, and the final product of degraded is carbonic acid gas and water, emits energy, very environmental protection simultaneously.
After polyethylene wax mixes with polyethylene and poly(lactic acid), form controlled release putamina, along with the increase of poly(lactic acid) addition, speed of degraded in soil is also just faster again for it, conventionally in 2-3 with regard to degradable.Polyethylene and polyethylene wax itself is difficult to degraded, but after mixing with poly(lactic acid), mixing and graft-blending phenomenon can occur, and just promoted the degraded of polyethylene and polyethylene wax in poly(lactic acid) degraded.Its biodegradable dominant mechanism is: under microorganism active (having enzyme to participate in) effect, enzyme enters the activity site of polymkeric substance and infiltrates into after the point of application of polymkeric substance, make polymkeric substance generation hydrolysis reaction, thereby make polymer macromolecule skeleton structure fragment into little segment, and final fracture becomes stable small molecules product, complete biodegradation process, final degraded product is H
2o and CO
2, do not pollute the environment.
Embodiment
Embodiment 1: by 50kg low-molecular polyethylene wax, be heated to 120 ℃, adding respectively each 20Kg of polyethylene and poly(lactic acid) and 30Kg after constantly stirring complete melting, maintenance temperature is 110-125 ℃, continues to stir 30 minutes, forms coating solution.To in the reactor of coating solution, be pressurized to 10-15Mpa, utilize pressure nozzle by the quick atomizing spraying of coating liquid to being preheating on the surface of granulated fertilizer of 900Kg of 40 ℃.After cool to room temperature, can obtain the nutrient controlled release phase and be the release and release control fertilizer of 12 months.
Embodiment 2: by 50kg low-molecular polyethylene wax, be heated to 120 ℃, adding respectively each 10Kg of polyethylene and poly(lactic acid) and 40Kg after constantly stirring complete melting, maintenance temperature is 110-125 ℃, continue to stir 30 minutes, form coating solution.To in the reactor of coating solution, be pressurized to 10-15Mpa, utilize pressure nozzle by the quick atomizing spraying of coating liquid to being preheating on the surface of granulated fertilizer of 900Kg of 40 ℃.After cool to room temperature, can obtain the nutrient controlled release phase and be the release and release control fertilizer of 8 months.
Embodiment 3: by 60kg low-molecular polyethylene wax, be heated to 120 ℃, adding respectively each 20Kg of polyethylene and poly(lactic acid) and 20Kg after constantly stirring complete melting, maintenance temperature is 110-125 ℃, continue to stir 30 minutes, form coating solution.To in the reactor of coating solution, be pressurized to 10-15Mpa, utilize pressure nozzle by the quick atomizing spraying of coating liquid to being preheating on the surface of granulated fertilizer of 900Kg of 40 ℃.After cool to room temperature, can obtain the nutrient controlled release phase and be the release and release control fertilizer of 10 months.
Embodiment 4: by 25kg low-molecular polyethylene wax, be heated to 120 ℃, adding respectively each 10Kg of polyethylene and poly(lactic acid) and 15Kg after constantly stirring complete melting, maintenance temperature is 110-125 ℃, continue to stir 30 minutes, form coating solution.To in the reactor of coating solution, be pressurized to 10-15Mpa, utilize pressure nozzle by the quick atomizing spraying of coating liquid to being preheating on the surface of granulated fertilizer of 950Kg of 40 ℃.After cool to room temperature, can obtain the nutrient controlled release phase and be the release and release control fertilizer of 3 months.
Embodiment 5: by 30kg low-molecular polyethylene wax, be heated to 120 ℃, adding respectively each 5Kg of polyethylene and poly(lactic acid) and 10Kg after constantly stirring complete melting, maintenance temperature is 110-125 ℃, continue to stir 30 minutes, form coating solution.To in the reactor of coating solution, be pressurized to 10-15Mpa, utilize pressure nozzle by the quick atomizing spraying of coating liquid to being preheating on the surface of granulated fertilizer of 950Kg of 40 ℃.After cool to room temperature, can obtain the nutrient controlled release phase and be the release and release control fertilizer of 2 months.
Claims (4)
1. a degradable release-controlled film, is characterized in that: press the preparation of row weight percent, low-molecular polyethylene wax 50-70%, polyvinyl resin 10-30%, polylactic resin 20-40%;
Low-molecular polyethylene wax is heated to 110 ℃-125 ℃, can form the fused solution polyethylene wax that viscosity is lower, to after the polyvinyl resin of formula ratio and Biodegradable polylactic acids mixed with resin, join in the polyethylene wax solution of melting again, after abundant stirring and evenly mixing degradable release-controlled film.
2. a production method for 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 ℃, can forms the fused solution polyethylene wax that viscosity is lower;
(b) after being mixed, the polyvinyl resin 10-30% of formula ratio and Biodegradable polylactic acids resin 20-40% join 50-70% in the low molecular weight polyethylene wax solution of melting, after abundant stirring and evenly mixing, sprayed to the surface of large the fertilizer that is preheating to 40 ℃, can be formed the release and release control fertilizer of excellent property after 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 CN102276348A (en) | 2011-12-14 |
| CN102276348B true CN102276348B (en) | 2014-03-12 |
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| CN201110146649.0A Expired - Fee Related 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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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
Non-Patent Citations (2)
| Title |
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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》.2006,第22卷(第5期), |
| 聚乳酸/聚乙烯醇共混膜的制备;王华林等;《高分子材料科学与工程》;20060930;第22卷(第5期);229-231，235 * |
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