WO2009021388A1 - Agent d'enrobage polymère aqueux, engrais enrobé à libération régulée et leur préparation - Google Patents

Agent d'enrobage polymère aqueux, engrais enrobé à libération régulée et leur préparation Download PDF

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Publication number
WO2009021388A1
WO2009021388A1 PCT/CN2008/000712 CN2008000712W WO2009021388A1 WO 2009021388 A1 WO2009021388 A1 WO 2009021388A1 CN 2008000712 W CN2008000712 W CN 2008000712W WO 2009021388 A1 WO2009021388 A1 WO 2009021388A1
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Prior art keywords
coating agent
weight
fertilizer
monomer
aqueous polymer
Prior art date
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PCT/CN2008/000712
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English (en)
Chinese (zh)
Inventor
Lianbu Wan
Bing Yu
Hongkun Chen
Li Yang
Original Assignee
Shandong Kingenta Ecological Engineering Co., Ltd.
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Application filed by Shandong Kingenta Ecological Engineering Co., Ltd. filed Critical Shandong Kingenta Ecological Engineering Co., Ltd.
Priority to CN2008801024843A priority Critical patent/CN101932537A/zh
Publication of WO2009021388A1 publication Critical patent/WO2009021388A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
    • C08F212/02—Monomers containing only one unsaturated aliphatic radical
    • C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
    • C08F212/06—Hydrocarbons
    • C08F212/08—Styrene
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1802—C2-(meth)acrylate, e.g. ethyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/04—Acids; Metal salts or ammonium salts thereof
    • C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1811—C10or C11-(Meth)acrylate, e.g. isodecyl (meth)acrylate, isobornyl (meth)acrylate or 2-naphthyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1818—C13or longer chain (meth)acrylate, e.g. stearyl (meth)acrylate

Definitions

  • Aqueous polymer coating agent, coated controlled release fertilizer and preparation method thereof is aqueous polymer coating agent, coated controlled release fertilizer and preparation method thereof
  • the invention relates to an aqueous polymer coating agent and a coated controlled release fertilizer comprising the same, and a preparation method thereof, and belongs to the technical field of materials and fertilizers. Background technique
  • the controlled release fertilizers can be divided into two broad categories according to the type of the coating material: one is a controlled release fertilizer based on an inorganic material, such as described in US Pat.
  • Sulfur-coated urea (SCU) prepared by coating molten liquid sulfur on urea is a typical representative thereof.
  • the advantage of this controlled fertilizer is that the raw material and production cost are low.
  • the disadvantage is that the film material is too brittle, and the film layer is easily broken during production, storage and transportation; in addition, the surface of the film layer is easy to form large pores, thus affecting its Controlled release properties; long-term use of sulfur-coated fertilizers can also lead to acidification of the soil.
  • the other type is a controlled release fertilizer which is an organic polymer material as a coating agent.
  • aqueous polymer coating agents eliminates the drawbacks of organic solvent-based polymeric coating agents.
  • CN 1388169 and CN 1546543 disclose a method for preparing an aqueous polymer fertilizer coating agent using a polymer material such as waste plastic as a main raw material, although the method partially overcomes the disadvantages of the organic soluble polymer fertilizer coating agent, The method must first dissolve some polymer materials such as waste plastics with some organic solvents, and then use the high-speed shear emulsification technology to prepare the aqueous polymer coating agent, so the harm of the organic solvent is not completely eliminated; The substance is already a polymer material, and its composition and structure have been difficult to change, thus greatly reducing the possibility of adjusting the dry release of the controlled release fertilizer by adjusting the polymer composition and structure. Summary of the invention
  • the object of the present invention is to provide an environmentally friendly low viscosity, high solids aqueous polymer coating without any organic solvent, in view of the problems existing in the production of polymer coating agents in controlled release fertilizers. And a coated controlled release fertilizer comprising the coating agent.
  • an aqueous polymeric coating agent comprising a hard monomer, a soft monomer and a functional monomer selected from the group consisting of a free-radically polymerizable unsaturated acid in an initiator, an emulsifier, and
  • the emulsion polymerization is carried out in the presence of an optional co-emulsifier, wherein the weight ratio of the hard monomer to the soft monomer is from 2:1 to 1:2, and the functional monomer is from 0.2 to 15 by weight based on the total weight of the monomer. . /. .
  • the present invention also provides a coated controlled release fertilizer comprising a fertilizer core and a coating film on the outside of the fertilizer core, wherein the coating film comprises a polymer film formed by the aqueous polymer coating agent of the present invention, and optionally The polymer film contains an inorganic layer of an inorganic powder.
  • the present invention also provides a method of preparing the coated controlled release fertilizer comprising coating the aqueous polymer coating agent of the present invention onto a fertilizer particle in a fluidized bed, forming a polymer film on the surface of the fertilizer particle, and An inorganic powder is optionally adhered to the polymer film to form a coating process of the inorganic layer. Since the coating agent of the present invention uses water as a medium, the disadvantages of the organic solvent type coating agent are completely eliminated, and since the preparation process is from a monomer, the composition and structure of the film forming polymer can be adjusted by adjusting the polymerization formula and process. In order to achieve the purpose of regulating the release of nutrients from controlled release fertilizers.
  • the aqueous polymer coating agent of the present invention has a low viscosity and a high solid content, and the glass transition temperature can be adjusted by the ratio of hard and soft monomers in the formulation.
  • the polymer coating material contains functional groups capable of association with water molecules, the materials also have certain water retention properties.
  • the envelope of the coated dry fertilizer of the present invention comprises a polymer film formed of the aqueous polymer coating agent of the present invention and an inorganic layer containing an inorganic powder outside the polymer film.
  • the inorganic layer containing the inorganic powder as the outermost layer not only prevents sticking and abrasion, but also partially functions to regulate nutrient dry release.
  • the coated controlled release fertilizer of the present invention has the advantage of being environmentally friendly, and the controlled release time can be adjusted by the composition, structure and amount of the coating agent to meet the release requirements of the fertilizer for different crop applications.
  • the hard monomer used in the preparation of the aqueous polymer coating agent of the present invention is selected from one or more of a styrene monomer and methyl methacrylate.
  • the body includes, for example, styrene and 0-methylstyrene.
  • the soft monomer is selected from the chemical formula
  • the functional monomer is a free-radically polymerizable unsaturated acid, preferably one or more selected from the group consisting of acrylic acid, methacrylic acid and butenedioic acid.
  • the glass transition temperature is 5 ⁇ 65*C, preferably 15 ⁇ 50, more preferably 25 ⁇ 45"C.
  • the weight ratio of hard soft monomer is 2:1 ⁇ 1:2, preferably 1.8:1 ⁇ 1: 1.5, more preferably 1.5:1 to 1:1.2.
  • the functional monomer is used in an amount of 0.2 to 15% by weight, preferably 0.5 to 5% by weight based on the total weight of the monomers.
  • the emulsifier employed in the present invention is an anionic emulsifier or a mixture of an anionic emulsifier and a nonionic emulsifier.
  • the anionic emulsifiers used in the present invention are all conventional anionic emulsifiers well known to those skilled in the art, and include, for example, the fatty acid sodium RCOONa, wherein R is C 12 ⁇ C 18 alkyl group; an alkoxy " ⁇ ⁇ ⁇ sodium ROS0 3 Na, wherein R is C 12 ⁇ C 18 alkyl; alkyl sulfonate RS0 3 Na, wherein R is C 12 ⁇ C 18 alkyl Base; alkyl sodium t RC 6 H 4 S0 3 Na, wherein R is C 12 ⁇ C 18 alkyl; alkyl diphenyl ether disulfonate; disproportionated rosin and alkyl naphthalene sulfonate (open powder ).
  • a preferred anionic emulsifier is one or more selected from the above anionic emulsifiers.
  • the nonionic emulsifiers used in the present invention are all conventional nonionic emulsifiers well known to those skilled in the art, and include, for example, polyoxyethylene sorbitan fatty acid esters, alkylphenol ethoxylates, alkyl poly Oxyethylene ethers and the like.
  • a preferred nonionic emulsifier is one or more selected from the above nonionic emulsifiers.
  • the co-emulsifier used in the present invention is preferably a long-chain fatty alcohol having a carbon number of 8 or more, and includes, for example, n-octanol, isooctanol, dodecanol or the like.
  • the anionic emulsifier may be used singly or in combination with a nonionic emulsifier.
  • the amount of the anionic emulsifier is preferably 0.35.0% by weight, more preferably 1.03.0% by weight, based on the total weight of the monomers; the amount of the nonionic emulsifier is preferably 0 to 5.0% by weight, more preferably 0 to 3.0% by weight;
  • the amount of co-emulsifier is preferably from 0 to 1.0% by weight, more preferably from 0 to 0.3% by weight.
  • the initiator for emulsion polymerization is all conventional hot bows for emulsion polymerization which are well known to those skilled in the art! Hair spray and redox f I hair spray, preferably persulfate S I hair spray, such as ammonium persulfate, potassium persulfate or sodium persulfate.
  • the initiator is used in an amount of 0.2 to 2.0% by weight, preferably 0.5 to 1% by weight based on the total mass of the monomers.
  • the emulsion polymerization is carried out in the presence of a buffer, and the buffer used is any conventional buffer such as ammonium hydrogencarbonate or sodium hydrogencarbonate.
  • the buffer is preferably used in an amount of from 0.3 to 2.0% by weight based on the total weight of the monomers.
  • the reaction temperature of the emulsion polymerization of the present invention is preferably 60 to 95" C.
  • the emulsion polymerization time is preferably 3 to 12 hours.
  • the obtained aqueous polymer coating agent has a solid content of 20 to 70% by weight, more preferably 35 to 50% by weight. It is preferably 10 to 2000 mPa ⁇ s, more preferably 30 to 500 mPa ⁇ s.
  • the emulsion polymerization can be carried out in any conventional manner, and preferred emulsion polymerization processes include: a semi-continuous process, a seed process, and a pre-emulsification process.
  • a portion is added to the reaction vessel containing water, an emulsifier and a buffer, It is preferably 5 to 30% by weight of a mixed monomer (a hard monomer, a soft monomer and a functional monomer may be mixed in advance).
  • the temperature is raised to a certain temperature, for example, 60 parts are added, preferably 50 to 70% by weight of the initiator, and the remaining mixed monomers are simultaneously added, and the monomer addition rate is controlled to control the reaction system at the set reaction temperature.
  • the remaining initiator is added and reacted at the reaction temperature for a while.
  • the remaining monomer addition time is preferably 1.5 to 5 hours, and the total reaction time is preferably 3 to 10 hours.
  • emulsion polymerization process first, all functional monomers, 10-30% by weight of hard monomers and 10-30% by weight of soft monomers are added to a reaction vessel containing water, an emulsifier and a buffer, and the temperature is raised to a certain temperature.
  • the temperature for example, adding 30-50% by weight of the initiator at 60*C, reacting at the reaction temperature for 0.5 to 2.0 hours, preferably 1 to 1.5 hours; then adding the remaining mixed monomer at a constant rate, and then adding the remaining initiator,
  • the reaction is carried out for a while at the reaction temperature
  • the remaining monomer addition time is preferably from 1 to 3 hours, and the total reaction time is preferably from 5 to 12 hours.
  • a monomer pre-emulsion is added dropwise and the initiator is added in portions.
  • 40 to 70% by weight of water, 50 to 70% by weight of an emulsifier and 60 to 90% by weight of a mixed monomer are added to the vessel, and the mixture is stirred at 0 to 60, preferably at room temperature, 0.5 1.5.
  • the monomer pre-emulsion is obtained in an hour, preferably 0.6 to 1.0 hour.
  • the remaining water, emulsifier, co-emulsifier and mixed monomer are added to the reaction vessel, and the temperature is raised to a certain temperature by stirring, for example, 30 to 70% by weight of the initiator is added at 60°, and the monomer pre-emulsion is continuously dropped at the same time. After the addition is completed, the remaining initiator is added.
  • the reaction is carried out for a while at the reaction temperature.
  • the monomer pre-emulsion addition time is preferably from 1 to 3 hours, and the total reaction time is preferably from 5 to 12 hours.
  • the size of the polymer latex particles obtained by emulsion polymerization is mainly adjusted by the kind and amount of the emulsifier and the amount of the functional monomer, and the dry particle diameter of the polymer is 30 to 2000 nm, preferably 40 to 600 nm. More preferably, it is 50 to 100 nm.
  • nano-sized polymer latex particles are preferred, and the advantage is that the emulsion stability is good and the formed polymer film is dense.
  • the aqueous polymer coating agent of the invention can be applied to any water-soluble fertilizer, for example, it can be a single fertilizer, for example, a nitrogen fertilizer such as urea, a phosphate fertilizer such as ammonium phosphate, a potassium fertilizer such as potassium sulfate, or a compound fertilizer of any ratio of NPK, Mixed fertilizers, as well as other water-soluble plant nutrients.
  • a nitrogen fertilizer such as urea
  • a phosphate fertilizer such as ammonium phosphate
  • a potassium fertilizer such as potassium sulfate
  • compound fertilizer of any ratio of NPK, Mixed fertilizers as well as other water-soluble plant nutrients.
  • aqueous polymer coating agent of the present invention may be used alone or in combination with biodegradable Use in the form of a combination of natural polymers or other coating agents for any water soluble fertilizer.
  • a composite coating agent may be formed in combination with a biodegradable natural polymer or other coating agent, and they may be used in combination in a separate coating.
  • the coating process of the polymer coated controlled release fertilizer of the present invention can be carried out in a conventional coating manner in the art, preferably in a fluidized bed.
  • the coating process comprises coating the aqueous polymeric coating agent of the present invention onto fertilizer granules in a fluidized bed, forming a polymeric film on the surface of the fertilizer granules, and optionally adhering the inorganic powder to the polymeric film.
  • the encapsulation process of forming an inorganic layer The aqueous polymer coating agent of the present invention is applied to the surface of the fertilizer granules, preferably by spraying.
  • the coating process is more preferably carried out in a boiling or rotary drum fluidized bed.
  • the temperature in the fluidized bed is preferably 30 to 80", the spraying temperature of the coating agent is preferably 30 to 60"C, and the coating temperature of the inorganic powder is preferably 30 to 80.
  • the fertilizer granules are placed in a boiling or rotary drum fluidized bed and preheated to 30-801 C, preferably 40-60" C.
  • the aqueous polymerization prepared by the present invention is carried out using a dual flow nozzle.
  • the coating agent is evenly sprayed on the fertilizer granules to form a continuous uniform polymer film on the surface of the fertilizer granules.
  • the thickness of the polymer film layer can be adjusted between 20 and 150 microns as needed.
  • the weight of the film is preferably from 4 to 20% by weight, more preferably from 6 to 15% by weight, based on the total weight of the controlled release fertilizer.
  • the inorganic powder is sprayed into the fluidized bed to uniformly adhere to the surface of the polymer coated fertilizer particles.
  • the amount of inorganic powder accounts for 0.3 ⁇ of the total weight of the coated controlled release fertilizer. 10% by weight, preferably 0.5 to 5 parts by weight. /o, more preferably 1 to 3% by weight.
  • the inorganic powder is one or more selected from the group consisting of talc, diatomaceous earth, montmorillonite, kaolin, strontium carbonate, bentonite, attapulgite and sepiolite powder, preferably Talc powder, diatomaceous earth and calcium carbonate are more preferably micron-sized inorganic powders.
  • the particle size of the inorganic powder is preferably less than 20 microns, more preferably less than 10 microns, and most preferably less than 5 microns. Most preferred is talc, diatomaceous earth or carbonic acid having a particle size of less than 5 microns.
  • the monomer used in the examples is of a polymerization grade, and the emulsifier and buffer are industrial products, which are triggered.
  • the agent is an analytically pure reagent
  • the reaction medium is distilled water
  • the inorganic powder is industrial grade.
  • the monomer conversion of the polymerization reaction was measured by a gravimetric method.
  • the viscosity of the product 25 was measured by a rotational viscometer, the particle size of the polymer latex was measured by a transmission electron microscope, and the glass transition temperature of the polymer was measured by a DSC method.
  • the maintenance period of controlled release fertilizers is expressed as the number of days required for controlled release nutrients to start in 25 still waters until the cumulative nutrient release rate reaches 80%.
  • the specific measurement method is as follows: The controlled release fertilizer is immersed in 25* water, and the nutrients in the sample are dissolved into the water through the membrane.
  • the total nitrogen content of the dissolved solution is determined by the titration method after distillation according to GB/T 8572, according to GB/T 8573
  • the dissolved brick content was determined by ammonium vanadium citrate colorimetric method, and the dissolved potassium content was determined by flame photometer according to GB/T 8574.
  • the time required for the dissolved nutrients to reach 80% of the total nutrient mass is the nutrient release period of the controlled release fertilizer.
  • the polymerization monomer conversion rate is 98.4%
  • the product viscosity is 34mPa.S
  • the particle size is 70nm
  • the polymer The glass transition temperature was 38.2 *C.
  • the polymerization equipment and polymerization process were the same as in Example 1, except that 300 g of styrene, 150 g of decyl methacrylate, 490 g of butyl acrylate, 60 g of acrylic acid, 10 g of sodium lauryl sulfate, and octyl group were used. 12 g of phenol polyoxyethylene ether, 5 g of n-octanol, 12 g of ammonium persulfate, 12 g of ammonium hydrogencarbonate, and 1000 g of water.
  • the polymerization monomer conversion rate was 98.9 %, the product viscosity was 58 mPa ⁇ s, the particle diameter was 62 nm, and the polymer glass transition temperature was 25. l t:.
  • a 10k g compound fertilizer with a particle size of 2 ⁇ 4 ⁇ m (from Shandong Jinzhengda Ecological Engineering Co., Ltd., NP 2 0 5 -K 2 0% by weight: 16-16-16) was charged into boiling fluidization. In the bed, preheat to 50 ⁇ 60"C, then spray 1.8kg of the above-mentioned coating agent preheated to 40 from the double-flow nozzle to the fertilizer surface at a spraying rate of 100g per minute. Based on the dry matter weight, the resulting polymerization
  • the composition of the controlled release fertilizer is about 91.8 wt% of the compound fertilizer and about 8.2 wt% of the polymer film.
  • the nutrient release period of the controlled release fertilizer is about 120 days.
  • styrene 470 g of butyl acrylate, 12 g of octadecyl acrylate and 60 g of methacrylic acid were uniformly mixed, and 80% of the mixed monomer was added to the above round bottom flask at a time, at room temperature
  • the emulsion was emulsified at 700 rpm for 45 minutes, and the obtained monomer pre-emulsion was transferred to a constant pressure dropping funnel for use.
  • 14 g of ammonium persulfate was dissolved in 100 g of distilled water for use.
  • the reaction temperature is controlled to about 2 hours. After the addition is completed, add the remaining The 40-liter potassium persulfate aqueous solution was continued for about 4 hours at about 80 TC. Cool to room temperature, adjust the pH of the system to neutral with 10% ammonia water, then stop stirring and discharge to obtain the target product.
  • the polymerization monomer conversion rate was 97.8 %, the product viscosity was 47 mPa ⁇ s, the particle size was 78 nm, and the glass transition temperature of the polymer was 19.4.
  • a large particle urea of 10k g particle size of 3 ⁇ 5 ⁇ m (from Shandong Mingshui Chemical Co., Ltd., with N weight of 46.4) was charged into a boiling fluidized bed and heated to about 60 °C. Then, 1.7 kg of the above-mentioned coating agent which had been preheated to about 45" was sprayed onto the surface of the fertilizer through a two-flow nozzle at a spraying rate of 80 g per minute.
  • the composition of the obtained polymer-coated controlled release fertilizer was about 92.3% by weight of urea and about 7.7% by weight of the polymer film, based on the dry matter weight.
  • the controlled release fertilizer has a release period of about 65 days.
  • Fertilizer coating process 10k g of large-grain urea with a particle size of 3 ⁇ 5mm (from Shandong Mingshui Chemical Co., Ltd., 4wt of N weight) was charged into a boiling fluidized bed and heated to about 60, and then passed through a The dual flow nozzle sprayed 1.7 kg of the above-mentioned coating agent, which had been preheated to about 45 Torr, onto the surface of the fertilizer at a rate of 80 grams per minute. Then, 250 g of diatomaceous earth having an average particle diameter of 3 ⁇ m was uniformly sprayed onto the surface of the fertilizer having a temperature of about 60 C.
  • the composition of the obtained polymer coated dry fertilizer was about 90.2% by weight of urea, about 7.5% by weight of polymer film, and 2.3% by weight of diatomaceous earth.
  • the nutrient release period of the controlled release fertilizer is about 80 days.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Fertilizers (AREA)

Abstract

L'invention porte sur un agent d'enrobage polymère aqueux, sur un engrais à libération régulée enrobé par un tel agent d'enrobage et sur leur préparation. L'agent de revêtement est préparé par polymérisation en émulsion d'un monomère dur, d'un monomère mou et d'un monomère fonctionnel choisi parmi des acides insaturés polymérisables par polymérisation radicalaire en présence d'un amorceur, d'un émulsifiant et d'un auxiliaire d'émulsification facultatif, le rapport massique du monomère dur au monomère mou étant de 2:1-2:2, et le % en poids du monomère fonctionnel étant 0,2-15 % en poids des monomères totaux.
PCT/CN2008/000712 2007-08-15 2008-04-08 Agent d'enrobage polymère aqueux, engrais enrobé à libération régulée et leur préparation WO2009021388A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2008801024843A CN101932537A (zh) 2007-08-15 2008-04-08 水性聚合物包膜剂、包膜控释肥料及其制备方法

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CN200710141886.1 2007-08-15
CN2007101418861A CN101348394B (zh) 2007-08-15 2007-08-15 水性聚合物包膜剂及包膜控释肥料

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CN103755468A (zh) * 2013-12-26 2014-04-30 合肥工业大学 一种新型控释肥包膜剂及其制备方法
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