CN101172913A - Polymer coating controlled release fertilizer and method for producing the same - Google Patents
Polymer coating controlled release fertilizer and method for producing the same Download PDFInfo
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- CN101172913A CN101172913A CNA200710176037XA CN200710176037A CN101172913A CN 101172913 A CN101172913 A CN 101172913A CN A200710176037X A CNA200710176037X A CN A200710176037XA CN 200710176037 A CN200710176037 A CN 200710176037A CN 101172913 A CN101172913 A CN 101172913A
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Abstract
The invention relates to novel solvent type gradable polymer coat membrane controlled release fertilizer for fertilizer controlled release and the preparation method thereof, and belongs to the technical field of the fertilizer controlled release. The polymer coat membrane controlled release fertilizer is made by coating a layer of gradable polymer membrane material which is 3 to 15 percent of the total weight of the gain fertilizer on the surface of grain fertilizer. The polymer membrane material is polymerized by mixing one of or a plurality of crylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, butyl methacrylate, methacrylic acid, acrylic acid-2-isooctyl acid, styrene, vinyl acetate, acrylic acid-a-lysine ester, and 4-vinyl pyridine. The coat membrane material has the advantages of good membrane molding performance, good water resistance performance, being graded naturally in nature, and environmental protection. The membrane coating technology is simple and adopts a common fluidized bed membrane coating method with low investment cost and easy operation.
Description
Technical field
The invention belongs to the fertilizer control release technical field.Be particularly related to degradable a kind of polymer release-control fertilizer coating of novel solvent-borne type that is used for fertilizer control release and preparation method thereof.
Background technology
Release and release control fertilizer is meant by various regulatory mechanisms and preestablishes fertilizer at the release mode of crop growing season, its nutrient is discharged and the corresponding to fertilizer of crop regulation of fertilizer requirement.Therefore research and develop the fertile technology of preparing of controlled release, the regulation of fertilizer requirement of its nutrient time of releasing and burst size and crop is matched, reduce fertilizer loss to greatest extent, improve utilization rate of fertilizer, reduce the chemical fertilizer application total amount, reducing the fertilising cost, reduce environmental pollution, is one of developing direction of current chemical fertilizer.
The polymeric film material is the key factor of the fertile character of decision controlled release, it is roughly as follows that polymer coating controlled release fertilizer is pressed the different Status of development of film material: (1) reclaims old plastics and polyolefins coated fertilizer, be characterized in that coating process is simple, but the malicious organic solvent that is to use, and material can not be in degraded in soil.The Beijing Chemical Engineering College applied for a patent (Chinese patent: 93100227.3) in 1993, with polystyrene, polyethylene, polypropylene or polyvinyl chloride is main material, and with the inorganic of adsorptivity or organic substance powder such as wilkinite etc., blend weighting material animals and plants organic waste materials and mineral materials being arranged is the coating liquid system of coating liquid auxiliary agent.China Agricultural University applied for a patent (Chinese patent: 03155813.5) in 2003, with polyolefine is main coated fertilizer, with the turps benzene,toluene,xylene is solvent, is the coating liquid system of coating liquid auxiliary agent with paraffin, organic materials starch etc., inorganic material lime carbonate etc.Shandong Agricultural University applied for a patent (Chinese patent: 200410035783.3) in 2004, to reclaim waste thermoplastic resin (polystyrene resin and polyvinyl resin) is main raw, with zellon and methylene dichloride is primary solvent, is the coating liquid system of coating liquid auxiliary agent with mineral powder, grain flour, rubber powder; Beijing City Agriculture and Forestry Institute in 2005 applies for a patent that (Chinese patent: 200510000039.4), being main coated fertilizer to reclaim macromolecular material (polypropylene), is solvent with turps, is the coated fertilizer system of coating liquid auxiliary agent with the zeolite powder; (2) type thermosetting resin coated fertilizer, the characteristics of this class fertilizer are that cost is lower, but this coating process more complicated.Nanjing University in 2003 etc. apply for a patent that (Chinese patent: 03132085.6), urea-formaldehyde resin is a coated fertilizer, is solvent with acid formalin, is the coating liquid system of coating liquid auxiliary agent with surface treatment agent tung oil or with tung oil-modified resol; Shandong Agricultural University applied for a patent (Chinese patent: 200410024050.X), be main raw with thermoset organic high molecular polymer (remodeling Resins, epoxy and amine curing agent) in 2004; (3) type thermoplastic resin coat fertilizer is characterized in that material is soft, and mechanical property is good.Calendar year 2001, Shenyang Inst. of Applied Ecology, Chinese Academy of Sciences applied for a patent that (Chinese patent: 01133415.0), acrylic resin and Mierocrystalline cellulose, starch are main raw, are the coating liquid system of solvent with ethanol, acetone, methylene dichloride, hexanaphthene and toluene; South China agriculture university in 2003 applies for a patent that (Chinese patent: 03140097.3), being main raw with the water soluble resin, is primary solvent with the aqueous acetic acid, is the coating liquid system of coating liquid auxiliary agent with the wilkinite; Institutes Of Technology Of Nanjing in 2005 apply for a patent (Chinese patent: 200510094536.5), with aqueous emulsion type and the water-soluble fluidity tackiness agent coating system that is coated fertilizer.(4) degradable type polymer capsule fertilizer, the characteristics of this class coated fertilizer are to be entirely Institute of Micro-biology's degraded in soil.1987 with 1989 Japan Chisso Corporation (JP) 6-32, Nakanoshima 3-chome, Kitaku, Osaka, Japan applied for three relevant patents (Chinese patent: 87105398,87105467,89101193), be the coated fertilizer prescription of main raw in China with tool degradation property polyolefine and polyether glycol.Nanjing University in 2002 etc. apply for a patent that (Chinese patent: 02137895.9), being coated fertilizer with the soluble cotton, is mixed solvent with ethanol, ether, is the coating liquid system of coating liquid auxiliary agent with drying grease additive tung oil.But, in actual applications, the main problem that the fertile field of China and even world's controlled release restricts its development is that polymeric film material price comparison height, kind are more single, the film material of practical application is not also broken through old plastics or the polyolefins material that reclaims basically, these materials are difficult to degraded in soil, life-time service will inevitably bring the serious environmental consequence.The coating process that matches uses the big organic solvent of toxicity more, as zellon, chloroform, toluene, ethylene dichloride etc., has fire, potential safety hazard in the production process.The degradable polymer integument technology practical application of having reported is too complicated and be difficult to real popularization, application.The invention provides a kind of specially at the preparation method of the novel degradable polymer materials of film-coated controlled release fertilizer and utilize this material special funds to prepare the method for film-coated controlled release fertilizer.Preparation technology's economically feasible of coated fertilizer involved in the present invention and coated fertilizer thereof.Degradable polymer integument release and release control fertilizer of the present invention does not at home and abroad appear in the newspapers, and does not see use at home.
Summary of the invention
The purpose of this invention is to provide a kind of polymer coating controlled release fertilizer and preparation method thereof, it is characterized in that, described polymer coating controlled release fertilizer is to coat 3%～15% the degradable type polymeric film material that one deck accounts for the fertile gross weight of particle on granulated fertilizer surface.
The step of preparation process of described polymer coating controlled release fertilizer:
1) being prepared as follows of described polymeric film material: in reactor, to be vinylformic acid 0～30 by ratio of weight and the number of copies, methyl acrylate 0～30, ethyl propenoate 0～60, butyl acrylate 0～60, methyl methacrylate 0～70, butyl methacrylate 0～70, methacrylic acid 0～20, the different monooctyl ester 0～50 of vinylformic acid-2-, vinylbenzene 0～60, vinyl acetate 0～30, vinylformic acid-α-Methionin ester 0～20, after the monomer of one or more of 4-vinylpridine 0～25 mixes, logical nitrogen, heat temperature raising, when treating that temperature is increased to 70～90 ℃, adding polymer weight portion rate is 0.05～0.2 part a initiator, initiated polymerization, react after 2～7 hours, obtain the polymeric film material, cooling discharging is standby; Wherein, the second-order transition temperature of the polymeric film material that makes is-25～80 ℃, and polymericular weight is 103～107;
2) 3% ~ 15% the ratio that accounts for the fertile gross weight of particle in the polymeric film material takes by weighing the polymeric film material: the mixed solvent that adds polymeric film material ratio of weight and number and be 1～40 times, behind the stirring and evenly mixing, add various fillers, auxiliary agent simultaneously, make its whole dissolvings, make polymer capsule liquid;
3) select the round shaped grain shape fertilizer of grade at 2～4mm, granulated fertilizer is placed in the boiling type fluidized-bed coating tower, carry out preheating in 10～15 minutes under 55～75 ℃, fluidisation pressure is adjusted to the fertiliser granulates shape that fully seethes with excitement is as the criterion, and atomizing pressure is 3kpa; Hot blast temperature is under 50～70 ℃ of conditions, and coating liquid evenly is coated in the granulated fertilizer surface;
4) continue oven dry 5～30 minutes after a coating is finished in the coating tower, form one deck plastic film at particle surface, mixed solvent is by the condenser recycling; The fertilizer of wrapping is emitted in shutdown, and cooling is the final polymer film-coated controlled release fertilizer.
Described mixed solvent is by ethyl acetate: butylacetate: hexanaphthene=0～80: 0～80: 0～80 ratio of weight and number mixed preparing forms.
Described filler is in paraffin, talcum powder, zeolite powder and the wilkinite at least two kinds, wherein to account for the weight ratio of polymeric film material be 0～0.03 to paraffin, the weight ratio that talcum powder accounts for the polymeric film material is 0～0.02, the weight ratio that zeolite powder accounts for the polymeric film material is 0～0.01, and the weight ratio that wilkinite accounts for the polymeric film material is 0～0.02.
Described solubility promoter is at least a in methyl iso-butyl ketone (MIBK), trimethylcyclohexanone and the diethylene glycol monobutyl ether, wherein to account for the weight ratio of polymeric film material be 0～0.03 to methyl iso-butyl ketone (MIBK), the weight ratio that trimethylcyclohexanone accounts for the polymeric film material is 0～0.02, and the weight ratio that diethylene glycol monobutyl ether accounts for the polymeric film material is 0～0.02.
Described initiator is a kind of in benzoyl peroxide, the azo isobutyronitrile, and consumption is 0.05～0.2 of a polymer weight umber.
The optional urea of described granulated fertilizer, volatile salt, ammonium nitrate, ammonium sulfate, vitriolate of tartar, Repone K, saltpetre, Secondary ammonium phosphate, primary ammonium phosphate or composite fertilizer.
The invention has the beneficial effects as follows with coated fertilizer in the past and compare that the present invention has realized the method for employing synthetic degradable type polymkeric substance manufacturing coated fertilizer truly.Have following tangible advantage:
1. coated fertilizer has carried out special formulation design, and at the coating purposes of fertilizer, the specific aim that material is used improves greatly specially.This serial coated fertilizer has good film forming properties, has good water repelling property, and can degrade voluntarily at occurring in nature, belongs to environment-friendly materials.
2. the heating for dissolving polymer process with commonly used is different, adopts the mode dissolve polymer film material that does not heat, and reduces the volatilization of the solvent in energy consumption and the dissolution process.
3. coating process is simple, adopts common fluidized-bed coating method, and cost of investment is low, and is simple and feasible.
4. by changing monomeric composition and ratio in the mould material, the molecular weight size and the second-order transition temperature of regulation and control mould material, and then snappiness, hardness and the shock resistance of optimization film material.
5. by changing the composition and the ratio of close and distant aqueous monomer in the mould material, regulate and control hydrophilic and hydrophobic, water tolerance and the permeability of mould material, thereby more can realize good controlled-release effect.
6. by optimizing the structure and the thickness of film material, film material price is 70% of a conventional film material price, thereby greatly reduces the production cost of fertilizer, and release and release control fertilizer is applied on field crop becomes possibility.
Embodiment
The invention provides a kind of polymer coating controlled release fertilizer and preparation method thereof, described polymer coating controlled release fertilizer is to coat 3% to 15% the degradable type polymerized film that one deck accounts for the fertile gross weight of particle on granulated fertilizer surface.
Being prepared as follows of described polymeric film material: in reactor, to be vinylformic acid 0～30 by ratio of weight and the number of copies, methyl acrylate 0～30, ethyl propenoate 0～60, butyl acrylate 0～60, methyl methacrylate 0～70, butyl methacrylate 0～70, methacrylic acid 0～20, the different monooctyl ester 0～50 of vinylformic acid-2-, vinylbenzene 0～60, vinyl acetate 0～30, vinylformic acid-α-Methionin ester 0～~ 20, the monomer of one or more of 4-vinylpridine 0～25 mixes, logical nitrogen, heat temperature raising, when treating that temperature is increased to 70～90 ℃, add benzoyl peroxide 0～0.2 or azo isobutyronitrile 0～0.2, initiated polymerization, react after 2～7 hours, obtain the polymeric film material.Add the mixed solvent stirring and evenly mixing again, add various fillers, auxiliary agent simultaneously, make its whole dissolvings, make polymer capsule liquid.Wherein, the second-order transition temperature of the polymeric film material that makes is-25～80 ℃, and polymericular weight is 10
3～10
7
Choice of Solvent: at the solvent toxicity problem in the above-mentioned patent, the present invention is according to the principle of " similar mixing ", choice structure is close, the solvent of low toxicity, superior performance experimentizes, the screening solubility property is good, evaporation rate is moderate, the solvent of low toxicity, searching can be dissolved this polymkeric substance well, can meet the solvent of spraying precipitated phase conversion method film-forming process requirement again.The choice of Solvent step is as follows: measure by ethyl acetate with the 100ml graduated cylinder: butylacetate: hexanaphthene=0～80: 0～80: the mixed solvent of 0～80 ratio of weight and number preparation joins in the 500ml reaction flask, be placed on the iron stand, add this polymer dry material of 4g, put into churned mechanically stirring arm, thermometer, reflux respectively.Open the stirring power supply, stir about is five minutes under 20～28 ℃ or room temperature, observes and finds that this polymer dissolution becomes true solution.This true solution is transparent low viscosity, with glass stick dip in get solution after, in air, solvent evaporates is rapid, forms the complete film of one deck on glass stick.The polymkeric substance true solution is placed into room temperature, and solution keeps vitreous state.
The coating process of polymer coating controlled release fertilizer carries out according to the following steps: in reactor, with 100 parts of synthetic polymeric film materials, add 100～4000 parts of mixed solvents, add simultaneously various fillers, auxiliary agent according to the above ratio, make polymer capsule liquid after heat temperature raising, the stirring, cooling is shifted standby; Take by weighing 3kg coating liquid (wherein the polymeric film material account for the fertile gross weight of particle 12%), the 5kg grade is at the round shaped grain shape fertilizer (as urea) of 2～4mm, granulated fertilizer is placed in the boiling type coating tower, under 55～75 ℃, carry out preheating in 10～15 minutes, fluidisation pressure is adjusted to the fertiliser granulates shape that fully seethes with excitement is as the criterion, and atomizing pressure is 3kpa; Hot blast temperature is under 50～70 ℃ of conditions, and coating liquid evenly is coated in the granulated fertilizer surface, continues oven dry 5～30 minutes after one time coating is finished in the coating tower, forms one deck plastic film at particle surface, and solvent is by the condenser recycling; The fertilizer of wrapping is emitted in shutdown, and cooling is finished product controlled release coat urea fertilizer.
At the coating liquid auxiliary agent problem in the above-mentioned patent, of the present invention according to will hanging down coating liquid viscosity, improve the unit plane coating rate, effectively regulate controlled release properties, reduce the membrane wrapping thickness principle, the good coating liquid of screenability, auxiliary agent.Add filler paraffin, talcum powder, zeolite powder or wilkinite, auxiliary agent methyl iso-butyl ketone (MIBK), trimethylcyclohexanone or diethylene glycol monobutyl ether to regulate the fertilizer surface properties.
The fertilizer that the present invention is suitable for can be various water miscible granulated fertilizers, comprises urea, volatile salt, ammonium nitrate, ammonium sulfate, and vitriolate of tartar, Repone K, saltpetre, Secondary ammonium phosphate, primary ammonium phosphate etc. can be straight fertilizers, also can be composite fertilizers; Require the particle diameter of granulated fertilizer to be: the most suitable particle diameter is at 2 ~ 4mm.Adopt small particle urea, also can be used for processing golf lawn fruit mountain range special-purpose control-release fertilizer.In the present invention, employing be granular urea and composite fertilizer, granular urea sieves earlier, control particle diameter in 2 ~ 4mm scope.
Biological degradability is estimated: with different polymeric film materials, in accurately placing into the soil after the weighing, every sampling in 1 month, wash the earth after drying on surface, weighing once more calculates the sample weight rate of loss.
Release characteristics check: get the fertilizer sample of developing, put into nylon net bag, immerse then in the 200ml distilled water, sealing places 25 ℃ of constant incubators, reaches at 80% o'clock respectively at cumulative release speed, taking out the 25ml soak solution analyzes, to remain soak solution and outwell, add 200ml distilled water again, and keep cumulative volume constant.Simultaneously, other gets identical coated fertilizer, to 100 orders, measures contained respectively this nutrient content in the sample through levigate.Mensuration project and method: N spectrophotometry in the urea; N, P, K conventional method of analysis in the composite fertilizer.
This polymer is different from the other materials part and is, can control the molecular weight size of macromolecular material and distributes and then reach the effect that the controlling diaphragm material discharges.Cross low then film material intensity as molecular weight and reduce, the difficulty if the too high then plasticizing of molecular weight becomes second nature, the second-order transition temperature of this polymkeric substance is-25～80 ℃, the scope of polymericular weight is 10
3～10
7
Enumerating object lesson is below further specified the present invention.
Embodiment 1
With ethyl propenoate: methyl methacrylate: 56: 38: 6 by ratio of weight and the number of copies mixed of methacrylic acid, stir, lead to nitrogen, during heat temperature raising to 75 ℃, adding polymer weight portion rate is 0.05 part a benzoyl peroxide, initiated polymerization, react after 2 ~ 7 hours, obtain the polymeric film material.Synthetic polymeric film material 100g is miscible in 2500g ethyl acetate by ratio of weight and the number of copies: hexanaphthene is in 2: 3 the mixed solvent, add and to account for the mixture that polymeric film material weight ratio is the methyl iso-butyl ketone (MIBK) of 0.05 wilkinite, 0.05 talcum powder, 0.02 paraffin and 0.01 respectively, stirring and dissolving makes coating liquid.With the 1500g diameter be the granular urea of 2～4mm pack into fluidizing fluid-bed in, be heated to 60～80 ℃.At hot blast temperature is under 70 ℃, is 3kpa with two-fluid spray nozzle at air atomizing pressure, and the progress spraying with per minute 2g all sprays to solution on the granular urea.The control release urea of gained, polymeric membrane account for about 6% of fertilizer gross weight, and this fertilizer is in 25 ℃ water, and the nutrient sustained release time is about 5 months.
Embodiment 2
In reactor with butyl acrylate: methyl methacrylate: ethyl propenoate: methacrylic acid 40: 40: 15 by ratio of weight and the number of copies: 5 mixed, stir, lead to nitrogen, heat temperature raising to 84 ℃, adding polymer weight portion rate is 0.08 part a benzoyl peroxide, initiated polymerization, react after 6 hours, obtain the polymeric film material.Synthetic polymeric film material 60g is miscible in 2000g ethyl acetate, butylacetate, hexanaphthene ratio by ratio of weight and the number of copies is 2: 2: 1 mixed solvent, it is 0.05 wilkinite, 0.02 talcum powder, 0.05 paraffin that adding accounts for polymeric film material weight ratio respectively, 0.01 the mixture of methyl iso-butyl ketone (MIBK), make coating liquid under stirring.With the 1500g diameter be 2～4mm granular urea pack into fluidizing fluid-bed in, heat 60～90 ℃.Is 4kpa with two-fluid spray nozzle at atomizing pressure, is sprayed on the granular urea with the speed of per minute 2g, and the fertile film of gained controlled release accounts for about 4% of the fertile gross weights of whole controlled releases.This fertilizer is in 25 ℃ of water, and the nutrient sustained release time is about 3 months.
Embodiment 3
In reactor with butyl methacrylate: methyl methacrylate: vinyl acetate: methacrylic acid was by weight 57: 34: 8: 1 mixed, stir, lead to nitrogen, heat temperature raising to 80 ℃, adding polymer weight portion rate is 0.06 part a benzoyl peroxide, initiated polymerization, react after 5 hours, obtain the polymeric film material.Synthetic polymeric film material 50g is miscible in 2000g ethyl acetate by ratio of weight and the number of copies: butylacetate: the hexanaphthene ratio is in 2: 1: 2 the mixed solvent, add that to account for polymeric film material weight ratio respectively be 0.05 wilkinite, 0.05 zeolite powder, 0.03 paraffin, 0.02 the mixture of diethylene glycol monobutyl ether, make coating liquid under stirring.With the 1000g diameter be the granular urea of 2～5mm pack into fluidizing fluid-bed in, be heated to 70～80 ℃, hot blast temperature is 70 ℃, is 4kpa with two-fluid spray nozzle at atomizing pressure, speed with per minute 2g is sprayed on the fertiliser granulates, and gained controlled-release fertilizer, film account for about 5% of whole fertilizer gross weights, in 25 ℃ water, the nutrient sustained release time is about 3 months.
Embodiment 4
In reactor with butyl methacrylate: methyl methacrylate: vinyl acetate: vinylformic acid was by weight 57: 34: 8: 1 mixed, stir, lead to nitrogen, heat temperature raising to 87 ℃, adding polymer weight portion rate is 0.1 part a benzoyl peroxide, initiated polymerization, react after 5 hours, obtain the polymeric film material.100g is miscible in 3000g by ratio of weight and the number of copies with synthetic polymeric film material, ethyl acetate: butylacetate: the hexanaphthene ratio is in 2: 2: 1 the mixed solvent, add that to account for polymeric film material weight ratio respectively be 0.05 wilkinite, 0.5 talcum powder, 0.02 paraffin, 0.02 methyl iso-butyl ketone (MIBK), the mixture of 0.01 trimethylcyclohexanone makes coating liquid under stirring.With the 1000g diameter be the granular compound fertilizer of 2～5mm pack into fluidizing fluid-bed in, being heated to 70～80 ℃ is 4kpa with two-fluid spray nozzle at atomizing pressure, flow with per minute 2.5g is sprayed on the compound fertilizer granules surface, about 10% of the fertile weight of the shared whole controlled releases of the fertile film of gained controlled release, this fertilizer is in 25 ℃ water or soil, and the nutrient sustained release time is about 8 months.
Embodiment 5
In reactor with ethyl propenoate: methyl acrylate: vinylbenzene: vinylformic acid was by weight 50: 39: 9: 2 ratio is mixed with mixing solutions, stir, lead to nitrogen, heat temperature raising to 78 ℃, adding polymer weight portion rate is 0.12 part a benzoyl peroxide, initiated polymerization, react after 3 hours, obtain the polymeric film material.100g is miscible in 2000g by ratio of weight and the number of copies with synthetic polymeric film material, ethyl acetate, butylacetate, hexanaphthene ratio are in 2: 2: 1 the mixed solvent, add that to account for polymer weight ratio respectively be 0.03 wilkinite, 0.04 talcum powder, 0.03 paraffin, 0.01 the mixture of methyl iso-butyl ketone (MIBK), make coating liquid under stirring.With the 1500g diameter be 2～4mm granular urea pack into fluidizing fluid-bed in, heat 60～90 ℃.Is 3kpa with two-fluid spray nozzle at atomizing pressure, is sprayed on the granular urea with the speed of per minute 2g, and the fertile film of gained controlled release accounts for about 6% of the fertile gross weights of whole controlled releases.This fertilizer is in 25 ℃ of water, and the nutrient sustained release time is about 5 months.
Embodiment 6
In reactor with methyl methacrylate: ethyl propenoate: vinylformic acid: 4-vinylpridine was by weight 45: 46: 7: 2 ratio is mixed with mixing solutions, stir, lead to nitrogen, heat temperature raising to 90 ℃, adding polymer weight portion rate is 0.15 part a azo isobutyronitrile, initiated polymerization, react after 4 hours, obtain the polymeric film material.90g is miscible in 2000g by ratio of weight and the number of copies with synthetic polymeric film material, ethyl acetate, butylacetate, hexanaphthene ratio are in 2: 1: 2 the mixed solvent, add that to account for polymeric film material weight ratio respectively be 0.03 wilkinite, 0.04 talcum powder, 0.03 paraffin, 0.01 the mixture of methyl iso-butyl ketone (MIBK), make coating liquid under stirring.With the 1500g diameter be 2～4mm granular urea pack into fluidizing fluid-bed in, heat 60～90 ℃.Is 4kpa with two-fluid spray nozzle at atomizing pressure, is sprayed on the granular urea with the speed of per minute 2g, and the fertile film of gained controlled release accounts for about 6% of the fertile gross weights of whole controlled releases.This fertilizer is in 25 ℃ of water, and the nutrient sustained release time is about 3 months, the degraded 15% in 12 months of polymeric membrane material.
Embodiment 7
In reactor with ethyl propenoate: the different monooctyl ester of methyl methacrylate: vinylformic acid: vinylformic acid-2-was by weight 48: 41: 9: 2 ratio is mixed with mixing solutions, stir, lead to nitrogen, heat temperature raising to 80 ℃, adding polymer weight portion rate is 0.06 part a benzoyl peroxide, initiated polymerization, react after 7 hours, obtain the polymeric film material.90g is miscible in 2000g by ratio of weight and the number of copies with synthetic polymeric film material, ethyl acetate, butylacetate, hexanaphthene ratio are in 3: 1: 1 the mixed solvent, add that to account for polymeric film material weight ratio respectively be 0.05 wilkinite, 0.05 talcum powder, 0.03 paraffin, 0.01 the mixture of methyl iso-butyl ketone (MIBK) makes coating liquid under stirring.With the 1500g diameter be 2 ~ 4mm particulate state primary ammonium phosphate pack into fluidizing fluid-bed in, heat 60 ~ 90 ℃.Is 4kpa with two-fluid spray nozzle at atomizing pressure, is sprayed on the particulate state primary ammonium phosphate with the speed of per minute 2g, and the fertile film of gained controlled release accounts for about 6% of the fertile gross weights of whole controlled releases.This fertilizer is in 25 ℃ of water, and the nutrient sustained release time is about 3 months.
Embodiment 8
In reactor with ethyl propenoate: methyl acrylate: butyl methacrylate: vinylformic acid-α-Methionin ester was by weight 52: 37: 9: 2 ratio is mixed with mixing solutions, stir, lead to nitrogen, heat temperature raising to 85 ℃, adding polymer weight portion rate is 0.09 part a azo isobutyronitrile, initiated polymerization, react after 6 hours, obtain the polymeric film material.60g is miscible in 2400g by ratio of weight and the number of copies with synthetic polymeric film material, ethyl acetate, butylacetate, hexanaphthene ratio are in 2: 1: 2 the mixed solvent, add that to account for polymeric film material weight ratio respectively be 0.05 wilkinite, 0.03 paraffin, 0.015 the mixture of methyl iso-butyl ketone (MIBK), make coating liquid under stirring.With the 1000g diameter be 2～4mm particulate state 15-15-15 composite fertilizer pack into fluidizing fluid-bed in, heat 60～90 ℃.Is 4kpa with two-fluid spray nozzle at atomizing pressure, is sprayed on the granular compound fertilizer with the speed of per minute 2g, and the fertile film of gained controlled release accounts for about 6% of the fertile gross weights of whole controlled releases.This fertilizer is in 25 ℃ of water, and the nutrient sustained release time is about 3 months, the degraded 12% in 12 months of polymeric membrane material.
Claims (8)
1. a polymer coating controlled release fertilizer is characterized in that, described polymer coating controlled release fertilizer is to coat 3%～15% the degradable type polymeric film material that one deck accounts for the fertile gross weight of particle on granulated fertilizer surface.
2. according to the described polymer coating controlled release fertilizer of claim 1, it is characterized in that, being prepared as follows of described polymeric film material: in reactor, to be vinylformic acid 0～30 by ratio of weight and the number of copies, methyl acrylate 0～30, ethyl propenoate O～60, butyl acrylate 0～60, methyl methacrylate 0～70, butyl methacrylate 0～70, methacrylic acid 0～20, the different monooctyl ester 0～50 of vinylformic acid-2-, vinylbenzene 0～60, vinyl acetate 0～30, vinylformic acid-α-Methionin ester 0～20, the monomer of one or more of 4-vinylpridine 0～25 is mixed into, add benzoyl peroxide 0～0.2 or azo isobutyronitrile 0～0.2, initiated polymerization, react after 2～7 hours, obtain the polymeric film material, cooling discharging is standby.
3. according to claim 1 or 2 described polymer coating controlled release fertilizers, it is characterized in that the second-order transition temperature of described polymkeric substance is-25～80 ℃, the scope of polymericular weight is 10
3～10
7
4. the manufacture method of a polymer coating controlled release fertilizer is characterized in that, the step of preparation process of described polymer coating controlled release fertilizer:
1) 3%～15% the ratio that accounts for the fertile gross weight of particle in the polymeric film material takes by weighing the polymeric film material: add polymeric film material ratio of weight and number and be 1～40 mixed solvent, stirring and evenly mixing, add various fillers, auxiliary agent simultaneously, make its whole dissolvings, make polymer capsule liquid;
2) select the round shaped grain shape fertilizer of grade at 2～4mm, granulated fertilizer is placed in the boiling type fluidized-bed coating tower, carry out preheating in 10～15 minutes under 55～75 ℃, fluidisation pressure is adjusted to the fertiliser granulates shape that fully seethes with excitement is as the criterion, and atomizing pressure is 3～4kpa; Hot blast temperature is under 50～70 ℃ of conditions, and coating liquid evenly is coated in the granulated fertilizer surface;
3) continue oven dry 5～30 minutes after a coating is finished in the coating tower, form one deck plastic film at particle surface, mixed solvent is by the condenser recycling; The fertilizer of wrapping is emitted in shutdown, and cooling is the final polymer film-coated controlled release fertilizer.
5. according to the manufacture method of the described polymer coating controlled release fertilizer of claim 4, it is characterized in that described mixed solvent is by ethyl acetate: butylacetate: hexanaphthene=0～80: 0～80: 0～80 ratio of weight and number mixed preparing forms.
6. according to the manufacture method of the described polymer coating controlled release fertilizer of claim 4, it is characterized in that, described filler is in paraffin, talcum powder, zeolite powder and the wilkinite at least two kinds, wherein to account for the weight ratio of polymeric film material be 0～0.03 to paraffin, the weight ratio that talcum powder accounts for the polymeric film material is 0～0.02, the weight ratio that zeolite powder accounts for the polymeric film material is 0～0.01, and the weight ratio that wilkinite accounts for the polymeric film material is 0～0.02.
7. according to the manufacture method of the described polymer coating controlled release fertilizer of claim 4, it is characterized in that, described solubility promoter is at least a in methyl iso-butyl ketone (MIBK), trimethylcyclohexanone and the diethylene glycol monobutyl ether, wherein to account for the weight ratio of polymeric film material be O～0.03 to methyl iso-butyl ketone (MIBK), the weight ratio that trimethylcyclohexanone accounts for the polymeric film material is 0～0.02, and the weight ratio that diethylene glycol monobutyl ether accounts for the polymeric film material is 0～0.02.
8. according to the manufacture method of the described polymer coating controlled release fertilizer of claim 4, it is characterized in that, the optional urea of described granulated fertilizer, volatile salt, ammonium nitrate, ammonium sulfate, vitriolate of tartar, Repone K, saltpetre, Secondary ammonium phosphate, primary ammonium phosphate or composite fertilizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710176037XA CN101172913A (en) | 2007-10-18 | 2007-10-18 | Polymer coating controlled release fertilizer and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710176037XA CN101172913A (en) | 2007-10-18 | 2007-10-18 | Polymer coating controlled release fertilizer and method for producing the same |
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| CN101172913A true CN101172913A (en) | 2008-05-07 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102093133A (en) * | 2010-12-17 | 2011-06-15 | 滨州市鑫龙油田化工有限公司 | Preparation method of coated controlled-release fertilizer and coating equipment thereof |
| CN102134173A (en) * | 2011-04-26 | 2011-07-27 | 中国科学院南京土壤研究所 | Method for manufacturing slow control release fertilizer on the basis of a coating machine of a closed type fluidized bed and equipment thereof |
| CN102295491A (en) * | 2011-07-21 | 2011-12-28 | 中国农业大学 | Natural polymer modified coated controlled release fertilizer and preparation method thereof |
| CN102863275A (en) * | 2011-07-06 | 2013-01-09 | 乔保军 | Sustained or controlled-release potash fertilizer and preparation method thereof |
| CN108812159A (en) * | 2018-06-28 | 2018-11-16 | 大新县科学技术情报研究所 | A kind of sugarcane high-yield implantation methods |
| CN108893095A (en) * | 2018-09-11 | 2018-11-27 | 重庆交通大学 | A kind of polymer shell cladding material, polymer wrapped delay-released inorganic salt and preparation method |
| CN109206212A (en) * | 2018-09-14 | 2019-01-15 | 仲恺农业工程学院 | A kind of preparation method of modified tung oil coated carbamide |
| CN109748759A (en) * | 2019-02-11 | 2019-05-14 | 权冉(银川)科技有限公司 | Material for water treatment and soil sanitation repair getting fat material and its system and method |
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- 2007-10-18 CN CNA200710176037XA patent/CN101172913A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102093133A (en) * | 2010-12-17 | 2011-06-15 | 滨州市鑫龙油田化工有限公司 | Preparation method of coated controlled-release fertilizer and coating equipment thereof |
| CN102093133B (en) * | 2010-12-17 | 2013-04-03 | 滨州市鑫龙油田化工有限公司 | Preparation method of coated controlled-release fertilizer and coating equipment thereof |
| CN102134173A (en) * | 2011-04-26 | 2011-07-27 | 中国科学院南京土壤研究所 | Method for manufacturing slow control release fertilizer on the basis of a coating machine of a closed type fluidized bed and equipment thereof |
| CN102863275A (en) * | 2011-07-06 | 2013-01-09 | 乔保军 | Sustained or controlled-release potash fertilizer and preparation method thereof |
| CN102295491A (en) * | 2011-07-21 | 2011-12-28 | 中国农业大学 | Natural polymer modified coated controlled release fertilizer and preparation method thereof |
| CN102295491B (en) * | 2011-07-21 | 2014-02-19 | 中国农业大学 | Natural polymer modified coated controlled release fertilizer and preparation method thereof |
| CN108812159A (en) * | 2018-06-28 | 2018-11-16 | 大新县科学技术情报研究所 | A kind of sugarcane high-yield implantation methods |
| CN108893095A (en) * | 2018-09-11 | 2018-11-27 | 重庆交通大学 | A kind of polymer shell cladding material, polymer wrapped delay-released inorganic salt and preparation method |
| CN108893095B (en) * | 2018-09-11 | 2021-02-05 | 重庆交通大学 | Polymer shell coating material, polymer-coated slow-release inorganic salt and preparation method |
| CN109206212A (en) * | 2018-09-14 | 2019-01-15 | 仲恺农业工程学院 | A kind of preparation method of modified tung oil coated carbamide |
| CN109748759A (en) * | 2019-02-11 | 2019-05-14 | 权冉(银川)科技有限公司 | Material for water treatment and soil sanitation repair getting fat material and its system and method |
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Application publication date: 20080507 |