KR20230115299A - Manufacturing method of coated granular fertilizer and coated granular fertilizer - Google Patents

Abstract

To provide a method for producing a coated granular fertilizer having excellent resin coating homogeneity, and the coated granular fertilizer. A method for producing a coated granular fertilizer comprising granular fertilizer and a urethane resin film covering the granular fertilizer, comprising the steps of adding a polyisocyanate component, a polyol component, and diazabicyclononene to the granular fertilizer in a rolling state; and a step of adding the polyisocyanate component and the polyol component to the granular fertilizer to form the urethane resin film on the surface of the granular fertilizer while maintaining the rolling state of the granular fertilizer; And the coated granular fertilizer excellent in the homogeneity of resin coating.

Description

Manufacturing method of coated granular fertilizer and coated granular fertilizer

This patent application claims priority and benefits under the Paris Convention based on Japanese Patent Application No. 2020-206637 (filed on December 14, 2020), and by citing here, the entire contents of the above application are hereby incorporated. It is assumed to be included in

The present invention relates to a method for producing a coated granular fertilizer and a coated granular fertilizer.

Conventionally, from the aging of workers in agriculture, the decrease in the number of workers, and the increase in the number of farm households working side-by-side, various inefficiency adjustment types that have a function of eluting fertilizer components at a predetermined time according to the growth of plants as a more viable fertilizer. A cover fertilizer is proposed. In the past, it has been known to control the dissolution rate of fertilizer components by coating or encapsulating granular fertilizers with resin, wax, sulfur or the like. In addition, as a method for producing a resin-coated granular fertilizer, a method is known in which uncured urethane containing a catalyst is added to a granular fertilizer provided in a rolling state in order to coat the surface of the granular fertilizer with a urethane resin (for example, See Patent Document 1). However, in these methods, since sticking of the granular fertilizer or adhesion of the granular fertilizer to the transmission device occurs, the homogeneity of the coating of the resin-coated granular fertilizer and the efficiency of production are not always satisfactory. As a means to solve such a problem, in the production method of coated granular fertilizer, by adding liquid paraffin or the like to the surface of granular urea before coating with resin, occurrence of aggregation between particles and adhesion of particles to transmission devices is prevented. A suppression method has been proposed (see Patent Literature 2). However, even in this method, there is still room for improvement in suppressing the occurrence of aggregation between particles and adhesion of particles to a transmission device.

Japanese Unexamined Patent Publication No. 9-202683 Japanese Unexamined Patent Publication No. 2011-16685

This invention makes it a subject to provide the manufacturing method of the coated granular fertilizer excellent in the homogeneity of resin coating.

As a result of studies to find out an excellent production method for a resin-coated granular fertilizer, the present inventors have found that, in the production method for a coated granular fertilizer, by using diazabicyclononene as a catalyst at the time of film formation, aggregation and rolling between particles It was found that a coated granular fertilizer in which the occurrence of adhesion of particles to equipment and the like was suppressed was obtained, and the present invention was completed.

That is, the present invention is as follows.

[1] A method for producing a coated granular fertilizer comprising a granular fertilizer and a urethane resin film covering the granular fertilizer,

Process of adding a polyisocyanate component, a polyol component, and diazabicyclononene to the said granular fertilizer in a rolling state; And, while maintaining the rolling state of the granular fertilizer, the polyisocyanate component and the polyol component are subjected to heavy addition, and the coated granular fertilizer including the step of forming the urethane resin film on the surface of the granular fertilizer manufacturing method.

[2] The production method according to [1], wherein the added amount of diazabicyclononene is 0.01 to 2% by weight relative to the total amount of the polyisocyanate component and the polyol component.

[3] The manufacturing method described in [1] or [2] including the following steps:

(a) mixing a polyisocyanate component, a polyol component, and diazabicyclononene to obtain a mixture;

(b) a step of adding the mixture obtained in the above step (a) to granular fertilizer in a rolling state, and

(c) The process of maintaining the rolling state of the granular fertilizer, adding a polyisocyanate component and a polyol component, and forming a resin film on the surface of the granular fertilizer.

[4] The manufacturing method described in [1] or [2] including the following steps:

(a) mixing a polyisocyanate component and a polyol component to obtain a mixture;

(b) a step of separately adding the mixture obtained in step (a) and diazabicyclononene to granular fertilizer in a rolling state, and

(c) The process of maintaining the rolling state of the granular fertilizer, adding a polyisocyanate component and a polyol component, and forming a resin film on the surface of the granular fertilizer.

[5] The production method according to [1] or [2], including the following steps:

(a) mixing a polyol component and diazabicyclononene to obtain a mixture;

(b) a step of separately adding the polyisocyanate component and the mixture obtained in the step (a) to the granular fertilizer in a rolling state, and

(c) The step of forming a resin coating on the surface of the granular fertilizer by adding a polyisocyanate component and a polyol component while maintaining the rolling state of the granular fertilizer.

[6] The production method according to [1] or [2], including the following steps:

(a) a step of separately adding a polyisocyanate component, a polyol component, and diazabicyclononene to granular fertilizer in a rolling state, and

(b) The process of maintaining the rolling state of the granular fertilizer, adding a polyisocyanate component and a polyol component, and forming a resin film on the surface of the granular fertilizer.

[7] The production method according to any one of [1] to [6], wherein the polyisocyanate component contains an aromatic polyisocyanate.

[8] The production method according to any one of [1] to [7], wherein the polyol component contains a castor oil-modified diol.

[9] The polyol component contains two or more compounds selected from the group consisting of castor oil-modified diols, alkylene diols having 2 to 8 carbon atoms, and compounds having 3 or more hydroxyl groups, [1] to [7] The manufacturing method described in any one of them.

[10] The production method according to any one of [1] to [8], wherein the polyol component includes a castor oil-modified diol, an alkylene diol having 2 to 8 carbon atoms, and a compound having 3 or more hydroxyl groups.

[11] A granular fertilizer and a resin film covering the granular fertilizer are provided,

The coated granular fertilizer in which the said resin film contains the urethane resin which is a polyisocyanate component and the polyol component polyadduct, and diazabicyclononene (it is hereafter called "the coated granular fertilizer of this invention").

According to the present invention, occurrence of aggregation between particles and adhesion of particles to a transmission device at the time of resin coating of granular fertilizer is suppressed, and a resin film can be formed more homogeneously on each particle, so that each particle elution It is possible to provide a coated granular fertilizer in which variation in patterns is suppressed.

The production method of the coated granular fertilizer of the present invention (hereinafter referred to as "the production method of the present invention") is to add a polyisocyanate component, a polyol component, and diazabicyclononene to the surface of the granular fertilizer in a rolling state. process ; And the process of making a polyisocyanate component and a polyol component heavy addition, and forming a urethane resin film on the surface of granular fertilizer, maintaining the rolling state of granular fertilizer.

The granular material containing a fertilizer component may be sufficient as the granular fertilizer used by this invention. Further, the granular fertilizer used in the present invention may be, for example, a granular material in which a fertilizer component is independently granulated, or a granular material containing a fertilizer component and a carrier holding the fertilizer component.

In the present invention, the fertilizer component is not particularly limited and can be appropriately selected according to the use and purpose of use of the coated granular fertilizer. As fertilizer components, for example, urea, ammonium nitrate, goto ammonium nitrate, ammonium chloride, ammonium sulfate, ammonium phosphate, sodium nitrate, calcium nitrate, potassium nitrate, lime nitrogen, formaldehyde processed urea (UF), acetaldehyde processed Nitrogen fertilizer components, such as urea (CDU), isobutylaldehyde processed urea (IBDU), and guanyl urea (GU); Phosphates such as superphosphate lime, medium superphosphate lime, soluble phosphorus, humic phosphorus, calcined phosphorus, small and medium phosphorus, high superphosphate, ammonium polyphosphate, potassium metaphosphate, calcium metaphosphate, high phosphorus acid, yellow phosphorus, potassium phosphorus, salt phosphorus fertilizer component; And potassium quality fertilizer components, such as potassium chloride, potassium sulfate, potassium sulfate, potassium sulfate, potassium sulfate, potassium bicarbonate, potassium phosphate, etc. are mentioned. These fertilizer components may be used individually by 1 type, or may be used in combination of 2 or more types of fertilizer components.

In the present invention, the carrier holding the fertilizer component can be appropriately selected according to the type of the fertilizer component, the use and purpose of use of the coated granular fertilizer, and the like. Examples of the carrier include kaolin minerals such as kaolinite, minerals such as montmorillonite, smectite, talc, pyrophyllite, silica, zeolite, and acid clay; vegetable substances such as cellulose, rice hulls, starch, and soybean meal; Water-soluble substances, such as lactose, sucrose, dextrin, table salt, and sodium tripolyphosphate, etc. may be included. The carrier may contain one of these components alone, or may contain plural types. Moreover, a granular fertilizer may contain 1 type of support|carrier, or the thing containing 2 or more types of support|carriers may be sufficient as it.

In this invention, granular fertilizer may further contain other components other than a fertilizer component and a support|carrier.

The granular fertilizer used in the present invention can be produced, for example, by a method of granulating a fertilizer component alone or by a method of mixing and granulating a fertilizer component and a carrier (further other components as necessary). The granulation method may be a normal granular material granulation method. Examples of such a granulation method include an extrusion granulation method, a fluidized bed granulation method, a tumbling granulation method, a compression granulation method, a fan granulation method, a coating granulation method, and an adsorption granulation method.

The particle size of the granular fertilizer used in the present invention is not particularly limited and can be appropriately selected depending on the type of fertilizer component and carrier, the use and purpose of use of the coated granular fertilizer, and the like. For example, the average particle diameter of granular fertilizer may be 0.1 to 15 mm, may be 1 to 10 mm, or may be 1 to 5 mm. In this embodiment, after obtaining granular fertilizer by the manufacturing method mentioned above, the granular fertilizer which has arbitrary particle diameters can be obtained by classifying using the sieve of an appropriate opening diameter, for example. In addition, in this specification, the average particle diameter of granular fertilizer is defined as the arithmetic average value (or also referred to as an arithmetic average value) of the projected area circle equivalent diameter, and is measured by a microscopy method (e.g., an electron microscope or an optical microscope), etc. . The measurement method may be changed depending on the size of the particle size of the granular fertilizer to be measured, and the like.

The shape of the granular fertilizer used in the present invention is not particularly limited and can be appropriately selected depending on the type of fertilizer component and carrier, the use and purpose of use of the resin-coated granular fertilizer, and the like. The shape of the granular fertilizer may be, for example, spherical, polyhedral, columnar, irregular shape, etc., and a spherical shape is preferable.

Diazabicyclononene used in the present invention is also called 1,5-diazabicyclo (4.3.0) nonene-5 or DBN, and is represented by the structural formula of formula (I) below.

[Formula 1]

As diazabicyclononene used in this invention, DBN (made by San-Apro Co., Ltd.) is mentioned, for example. In this production method, diazabicyclononene can be used in a catalytic amount, preferably in an amount of 0.01 to 2% by weight, more preferably in an amount of 0.01 to 1% by weight, relative to the total amount of the polyisocyanate component and the polyol component. do. More preferably, it is used in a proportion of 0.02 to 0.07% by weight.

In the present invention, the urethane resin means a three-dimensionally crosslinked resin by reacting a polyisocyanate component with a polyol component. In the present invention, a mixture of a polyisocyanate component and a polyol component (sometimes referred to as "uncured urethane") means that the polyisocyanate component and the polyol component do not react at all or partially partially preliminarily to the extent that they do not crosslink in three dimensions. means reacted. The form of such a mixture may be a non-solvent type, a solution type, an aqueous emulsion type, etc., but a non-solvent type and a liquid form can be preferably used in the step of adding to granular fertilizer.

In the present invention, polyisocyanate means a compound having two or more isocyanate groups. Examples of such polyisocyanates include aromatic polyisocyanates, aliphatic polyisocyanates, and alicyclic polyisocyanates, and derivatives thereof.

In this invention, it is preferable that polyisocyanate contains aromatic polyisocyanate from a viewpoint of sustained release performance (it is also called slow release property).

In the present invention, aromatic polyisocyanate means a compound having an aromatic ring and two or more isocyanate groups. Aromatic polyisocyanate may be a compound having one aromatic ring in the molecule or a compound having a plurality of aromatic rings. It is preferable that the isocyanate group of aromatic polyisocyanate is directly bonded to the aromatic ring. A benzene ring may be sufficient as an aromatic ring.

Specific examples of the aromatic polyisocyanate include 4,4'-diphenylmethane diisocyanate (MDI), tolylene diisocyanate (TDI), xylylene diisocyanate (XDI), tolidine diisocyanate (TODI), naphthalene-1,5 -Diisocyanate (NDI), tetramethylenexylylenediisocyanate (TMXDI), and polymethylenepolyphenylpolyisocyanate (Polymeric MDI), and their derivatives (e.g., isocyanurates, biurets, urethates) modified substances such as dione bodies). Aromatic polyisocyanate may be used individually by these 1 type, or may be used in combination of 2 or more type.

From the standpoint of sustained release performance, the aromatic polyisocyanate may be an aromatic polyisocyanate having two or more benzene rings having an isocyanate group. In such an aromatic polyisocyanate, the number of isocyanate groups directly bonded to each benzene ring may be one or two or more. Examples of such an aromatic polyisocyanate include MDI, TDI, TODI, and oligomers derived from these (eg, polymeric MDI).

In the present invention, an aliphatic polyisocyanate means a compound having an aliphatic chain and two or more isocyanate groups. Specific examples of such aliphatic polyisocyanate include hexamethylene diisocyanate (HDI), dimer acid diisocyanate (DDI), and norbornene diisocyanate (NBDI).

In the present invention, an alicyclic polyisocyanate means a compound having a saturated or unsaturated carbon ring having no aromaticity and two or more isocyanate groups. Examples of such alicyclic polyisocyanates include isophorone diisocyanate (IPDI), dicyclohexylmethane diisocyanate (hydrogenated MDI), and hydrogenated XDI.

In this invention, lysine triisocyanate, lysine diisocyanate, etc. can also be used as polyisocyanate. As a derivative of polyisocyanate, modified substances, such as an isocyanurate body, a biuret body, and a uretdione body, are mentioned, for example.

When the polyisocyanate component contains an aromatic polyisocyanate, the proportion of the aromatic polyisocyanate in the polyisocyanate component may be 30% by weight or more, 50% by weight or more, or 100% by weight from the viewpoint of sustained-release performance. .

In the present invention, the polyol component means a compound having two or more hydroxyl groups per molecule. As such a polyol component, C2-C8 alkylene diol, polyether polyol, polyester polyol, vegetable oil which has 2 or more hydroxyl groups, and these modified substances are mentioned, for example.

In the present invention, polyether polyol means a compound having two or more ether bonds and two or more hydroxyl groups in a molecule. The polyether polyol is obtained, for example, by adding polyhydric alcohol, amino alcohol, or amine as an initiator and adding ethylene oxide or propylene oxide. Specific examples of the polyether polyol include polytetramethylene ether glycol obtained by polymerizing tetrahydrofuran.

In the present invention, polyester polyol means a compound having two or more ester bonds and two or more hydroxyl groups in a molecule. Polyester polyol is obtained by making a polyhydric alcohol, polyether polyol, and a carboxylic acid containing compound react, for example. Moreover, for example, it is obtained also by ring-opening polymerization of a cyclic ester compound using a polyhydric alcohol as an initiator.

As a vegetable oil which has two or more hydroxyl groups, castor oil, soybean oil, and cottonseed oil are mentioned, for example. Examples of modified substances of vegetable oil having two or more hydroxyl groups include castor oil-modified diols and castor oil-modified polyols having three or more hydroxyl groups.

In this invention, it is preferable that the polyol component contains castor oil modified|denatured diol from a viewpoint of sustained-release performance. In addition, from the viewpoint of sustained-release performance, the polyol component is two or more selected from the group consisting of castor oil-modified diols, C2-8 alkylene diols, and compounds having 3 or more hydroxyl groups (i.e., two or three ) It is more preferable to include a compound of

In the present invention, castor oil-modified diol means a compound that can be derived from castor oil through a chemical reaction and has two hydroxyl groups. The castor oil-modified diol may be derived from castor oil, or may be a compound derived from castor oil and produced from raw materials other than castor oil. Castor oil is a fatty oil containing ricinoleic acid glyceride as a main component, and the castor oil-modified diol may be, for example, ricinoleic acid-modified diol.

In this invention, a commercial item can be used as a castor oil modified|denatured diol. As such commercial items, for example, URIC H-62 (hydroxyl value: 245 to 275, manufactured by Ito Oil Co., Ltd.), URIC Y-202 (hydroxyl value: 110 to 120, manufactured by Ito Oil Co., Ltd.), URIC Y-403 ( Hydroxyl value: 150 to 170, manufactured by Ito Oil Co., Ltd.), URIC Y-332 (hydroxyl value: 113 to 133, manufactured by Ito Oil Co., Ltd.), URIC AC-005 (hydroxyl value: 194 to 214, manufactured by Ito Oil Co., Ltd.), URIC AC-006 (hydroxyl value: 168 to 187, manufactured by Ito Oil Co., Ltd.), URIC PH-5001 (hydroxyl value: 45, manufactured by Ito Oil Co., Ltd.), URIC PH-5002 (hydroxyl value: 43, manufactured by Ito Oil Co., Ltd.), HS 2G-120 (hydroxyl value: 122, manufactured by Hokoku Oil Co., Ltd.), HS 2G-160R (hydroxyl value: 121, manufactured by Hokoku Oil Co., Ltd.), HS 2G-270B (hydroxyl value: 261, manufactured by Hokoku Oil Co., Ltd.), HS 2B-5500 (hydroxyl value: 178, manufactured by Hokoku Oil Co., Ltd.) and HS KA-001 (hydroxyl value: 224, manufactured by Hokoku Oil Co., Ltd.), but are not limited thereto.

Here, the "hydroxyl value" means the number of mg of potassium hydroxide corresponding to the hydroxyl group in 1 g of the sample, as described in the Japanese Industrial Standards (JIS) Polyether Test Method for Polyurethane (K 1557). Actually, it is a value calculated by esterifying a test sample with a pyridine solution of phthalic anhydride and titrating the excess reagent with a sodium hydroxide solution.

When the polyol component contains a castor oil-modified diol, the content of the castor oil-modified diol in the polyol component may be 6% by weight or more, or 8% by weight or more, based on the total amount of the polyol component, from the viewpoint of sustained-release performance. It may be 10 wt% or more, 30 wt% or more, 50 wt% or more, or 65 wt% or more. Further, the content of the castor oil-modified diol may be 93% by weight or less, 90% by weight or less, or 85% by weight or less based on the total amount of the polyol component from the viewpoint of sustained-release performance.

In the present invention, from the viewpoint of sustained-release performance, as the polyol component, an alkylenediol having 2 to 8 carbon atoms (hereinafter, simply referred to as "alkylenediol") may be included. The number of carbon atoms of the alkylenediol is preferably 3 or more, more preferably 4 or more, and preferably 7 or less, or more preferably 6 or less.

Alkylenediol may be linear or branched. Examples of the linear alkylenediol include ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, and 1,8-octane. Diol etc. are mentioned. Examples of branched chain alkylenediol include 2-methyl-1,3-propanediol, 2-methyl-1,4-butanediol, and 2,3-dimethyl-1,4-butanediol. can

When the polyol component contains an alkylenediol, the content of the alkylenediol in the polyol component may be 4% by weight or more, or 6% by weight or more, based on the total amount of the polyol component, from the viewpoint of sustained-release performance. , 8 wt% or more may be sufficient, or 10 wt% or more may be sufficient. Further, the content of the alkylenediol may be 25% by weight or less, or 21% by weight or less, 20% by weight or less, or 18% by weight or less based on the total amount of the polyol component from the viewpoint of sustained-release performance. or 15% by weight or less may be sufficient.

In this invention, the compound which has 3 or more hydroxyl groups may be included as a polyol component from a viewpoint of sustained-release performance. In the present invention, the compound having 3 or more hydroxyl groups means a compound having 3 or more hydroxyl groups per molecule. The compound having 3 or more hydroxyl groups may have 3 to 8 or 3 to 6 hydroxyl groups per molecule.

Examples of the compound having 3 or more hydroxyl groups include polyether polyol having 3 or more hydroxyl groups, castor oil, castor oil-modified polyol having 3 or more hydroxyl groups (eg, castor oil-modified triol), and 3 or more hydroxyl groups. poly(meth)acrylic acid polyol, condensed polyester polyol having 3 or more hydroxyl groups, and lactone polyester polyol having 3 or more hydroxyl groups. As a compound which has three or more hydroxyl groups, you may use individually by 1 type, or may use it in combination of 2 or more type. Moreover, you may use what is contained in a commercial item as a compound which has 3 or more hydroxyl groups. As the compound having 3 or more hydroxyl groups, castor oil-modified polyols having 3 or more hydroxyl groups and polyether polyols having 3 or more hydroxyl groups are preferred from the viewpoint of sustained-release performance.

When the polyol component contains a compound having 3 or more hydroxyl groups, the content of the compound having 3 or more hydroxyl groups in the polyol component may be 2% by weight or more based on the total amount of the polyol component from the viewpoint of sustained-release performance, 3% by weight or more may be sufficient, or 8% by weight or more may be sufficient. The content of the compound having three or more hydroxyl groups may be 87% by weight or less, 80% by weight or less, 76% by weight or less, or 60% by weight or less based on the total amount of the polyol component, from the viewpoint of sustained-release performance. may be present, may be 40% by weight or less, or may be 20% by weight or less.

In one aspect, the polyol component may be a mixture of a castor oil-modified diol, an alkylenediol having 2 to 8 carbon atoms, and a compound having 3 or more hydroxyl groups.

In this aspect, the amount of castor oil-modified diol relative to the total amount of the polyol component may be 7% by weight or more, preferably 10% by weight or more, or 30% by weight or more, from the viewpoint of sustained-release performance, 50 It may be 65% by weight or more, or 65% by weight or more. The amount of the castor oil-modified diol may be 93% by weight or less, or preferably 80% by weight or less, from the viewpoint of sustained-release performance.

Further, in this embodiment, the amount of the alkylene diol having 2 to 8 carbon atoms relative to the total amount of the polyol component may be 4% by weight or more, 6% by weight or more, or 8% by weight or more from the viewpoint of sustained-release performance. It is preferable, or 10 weight% or more may be sufficient. The amount of the alkylenediol having 2 to 8 carbon atoms may be 25% by weight or less, may be 21% by weight or less, may be 20% by weight or less, may be 18% by weight or less, or may be 15% by weight or less, from the viewpoint of sustained-release performance. it is desirable In this aspect, the amount of the compound having 3 or more hydroxyl groups per molecule relative to the total amount of the polyol component may be 2% by weight or more, and preferably 8% by weight or more, from the viewpoint of sustained-release performance. The amount of the polyol having a number of hydroxyl groups per molecule greater than 2 may be 87% by weight or less, preferably 78% by weight or less, may be 60% by weight or less, may be 40% by weight or less, or 20% by weight or less, from the viewpoint of sustained-release performance. It may be less than %.

In another aspect, the urethane resin is a polyisocyanate component containing an aromatic polyisocyanate, and a polyol component containing a castor oil-modified diol, an alkylene diol having 2 to 8 carbon atoms, and a polyether polyol. may be continued In the above aspect, the content of the aromatic polyisocyanate, the castor oil-modified diol, the alkylene diol having 2 to 8 carbon atoms, and the polyether polyol is 30 to 60% by weight and 30% by weight, respectively, based on the total amount of the polyisocyanate component and the polyol component. to 60% by weight, 3 to 10% by weight, or 2 to 20% by weight may be sufficient.

In another aspect, the urethane resin is a polyisocyanate component containing an aromatic polyisocyanate and a polyol component containing a castor oil-modified diol, an alkylene diol having 2 to 8 carbon atoms, and a castor oil-modified polyol. may be continued In the above aspect, the content of the aromatic polyisocyanate, the castor oil-modified diol, the alkylene diol having 2 to 8 carbon atoms, and the castor oil-modified polyol is 30 to 60% by weight, respectively, relative to the total amount of the polyisocyanate component and the polyol component, 5 to 60% by weight, 3 to 10% by weight, or 5 to 50% by weight may be sufficient.

In another aspect, the urethane resin may be a polyadduct of a polyisocyanate component containing aromatic polyisocyanate and a polyol component containing polyether polyol and castor oil. In the above aspect, the content of the aromatic polyisocyanate, the polyether polyol and the castor oil may be 30 to 60% by weight, 5 to 60% by weight, or 5 to 30% by weight, respectively, relative to the total amount of the polyisocyanate component and the polyol component. do.

In another aspect, the urethane resin may be a polyadduct of a polyisocyanate component containing aromatic polyisocyanate and a polyol component containing polyether polyol. In the above aspect, the content of the aromatic polyisocyanate and the polyether polyol may be 30 to 60% by weight or 30 to 60% by weight, respectively, with respect to the total amount of the polyisocyanate component and the polyol component.

In another aspect, the urethane resin may be a polyadduct of a polyisocyanate component containing aromatic polyisocyanate and a polyol component containing polyetherdiol and polyether polyol. In the above aspect, the content of the aromatic polyisocyanate, the polyetherdiol, and the polyether polyol is 30 to 60% by weight, 5 to 30% by weight, or 5 to 60% by weight, respectively, relative to the total amount of the polyisocyanate component and the polyol component. may be 1%.

In another aspect, the urethane resin may be a polyadduct of a polyisocyanate component containing aliphatic polyisocyanate and a polyol component containing polyetherdiol and polyether polyol. In the above aspect, the content of the aliphatic polyisocyanate, polyetherdiol and polyetherpolyol is 30 to 60% by weight, 5 to 30% by weight, or 5 to 60% by weight, respectively, relative to the total amount of the polyisocyanate component and the polyol component. may be 1%.

In another aspect, the urethane resin may be a polyadduct of a polyisocyanate component containing an aromatic polyisocyanate and a polyol component containing a castor oil-modified polyol. In the above aspect, the content of the aromatic polyisocyanate and the castor oil-modified polyol may be 20 to 70% by weight or 20 to 70% by weight, respectively, relative to the total amount of the polyisocyanate component and the polyol component.

In another aspect, the urethane resin may be a polyadduct of a polyisocyanate component containing aromatic polyisocyanate and a polyol component containing castor oil-modified diol. In the above aspect, the content of the aromatic polyisocyanate and the castor oil-modified diol may be 20 to 70% by weight or 20 to 70% by weight, respectively, relative to the total amount of the polyisocyanate component and the polyol component.

In another aspect, the urethane resin is 30 to 60 parts by weight of an aromatic polyisocyanate, 30 to 60 parts by weight of a castor oil-modified diol, 3 to 10 parts by weight of an alkylene diol having 2 to 8 carbon atoms, and 2 to 20 parts by weight It may be a polyadduct of a negative polyether polyol.

In another aspect, the urethane resin is 30 to 60 parts by weight of an aromatic polyisocyanate, 5 to 60 parts by weight of a castor oil-modified diol, 3 to 10 parts by weight of an alkylene diol having 2 to 8 carbon atoms, and 5 to 50 parts by weight It may be a polyadduct of a negative castor oil-modified polyol.

In another aspect, the urethane resin may be a polyadduct of 30 to 60 parts by weight of an aromatic polyisocyanate, 5 to 60 parts by weight of a polyether polyol, and 5 to 30 parts by weight of castor oil.

In another aspect, the urethane resin may be a polyadduct of 30 to 60 parts by weight of an aromatic polyisocyanate and 30 to 60 parts by weight of a polyether polyol.

In another aspect, the urethane resin may be a polyadduct of 30 to 60 parts by weight of an aromatic polyisocyanate, 5 to 30 parts by weight of a polyetherdiol, and 5 to 60 parts by weight of a polyether polyol.

In another aspect, the urethane resin may be a polyadduct of 30 to 60 parts by weight of aliphatic polyisocyanate, 5 to 30 parts by weight of polyetherdiol, and 5 to 60 parts by weight of polyether polyol.

The ratio M2/M1 of the number of moles M2 of hydroxyl groups of the polyol component to the number of moles M1 of isocyanate groups of the polyisocyanate component is preferably 0.7 or more, more preferably 0.9 or more, preferably 1.7 or less, and 1.5 or less. more preferable When the ratio M2/M1 is within the above range, excellent sustained-release performance tends to be obtained.

The coated granular fertilizer of this invention may have resin films other than a urethane resin film. In that case, the content of the urethane resin in the entire resin coating may be 80% by weight or more, 90% by weight or more, or 100% by weight based on the total amount of the resinous coating.

It is preferable that it is 1 mass part or more with respect to 100 mass parts of granular fertilizers, and, as for content of the urethane resin in a covering granular fertilizer, it is more preferable that it is 2 mass parts or more. Moreover, it is preferable that it is 20 mass parts or less with respect to 100 mass parts of granular fertilizers, or, as for content of a urethane resin, it is more preferable that it is 16 mass parts or less.

In the manufacturing method of the resin-coated granular fertilizer of this invention, a polyisocyanate component, a polyol component, and diazabicyclononene are used. As a process using these components, what is shown below is mentioned, for example, The manufacturing method of the resin coating granular fertilizer of this invention can include these processes.

A step of mixing a polyisocyanate component, a polyol component, and diazabicyclononene to obtain a mixture (A-1), a step of adding the mixture obtained in step A-1 to granular fertilizer in a rolling state (A-2), A step (A-3) of forming a urethane resin film on the surface of the granular fertilizer by adding a polyisocyanate component and a polyol component to the polyisocyanate component and a polyol component by maintaining the rolling state of the granular fertilizer (hereinafter, steps A-1 to A-3 together, It may be described as “Step A”).

A step of mixing a polyisocyanate component and a polyol component to obtain a mixture (B-1), a step of separately adding the mixture obtained in step B-1 and diazabicyclononene to granular fertilizer in a rolling state (B-2), A step (B-3) of adding a polyisocyanate component and a polyol component by maintaining the rolling state of the granular fertilizer to form a urethane resin film on the surface of the granular fertilizer (hereinafter, steps B-1 to B-3 together " It may be described as “Step B”).

A step (C-1) of mixing a polyol component and diazabicyclononene to obtain a mixture, a step (C-2) of separately adding the mixture obtained in step C-1 and a polyisocyanate component to granular fertilizer in a rolling state, Step (C-3) of forming a urethane resin film on the surface of the granular fertilizer by adding a polyisocyanate component and a polyol component by maintaining the rolling state of the granular fertilizer (hereinafter, steps C-1 to C-3 together " It may be described as “Step C”).

A step (D-1) of separately adding a polyisocyanate component, a polyol component, and diazabicyclononene to granular fertilizer in a rolling state. By maintaining the rolling state of the granular fertilizer, the polyisocyanate component and the polyol component are added in a granular form The step (D-2) of forming a urethane resin film on the surface of the fertilizer (hereinafter, steps D-1 to D-2 may be collectively referred to as "step D") may be used. When adding the polyisocyanate component, the polyol component, and diazabicyclononene separately, the order of addition is the order of the polyisocyanate component, the polyol component, and diazabicyclononene, the polyol component, the polyisocyanate component, and diazabicyclononene. order, polyol component, diazabicyclononene, and polyisocyanate component, polyisocyanate component, diazabicyclononene, and polyol component, diazabicyclononene, polyisocyanate component, and polyol component, or diazabi Any of the order of cyclononene, a polyol component, and a polyisocyanate component may be sufficient.

The temperature at the time of performing step A is appropriately set depending on the type of polyisocyanate component and polyol component used, the size of the granular fertilizer, etc., but the temperature in the rotary tank at which the granular fertilizer is in a rolling state, usually 40 to 100 It is the range of degreeC, Preferably it is the range of 55-75 degreeC. Further, after the addition of the mixture of the polyisocyanate component, the polyol component, and the diazabicyclononene, the polyisocyanate component and the polyol component proceed to polyaddition to the extent that the urethane is cured and adhesion between the resin-coated granular materials does not occur. The rolling state of the granular fertilizer is maintained, but the time to maintain the rolling state is usually about 1 to 30 minutes, and from the viewpoint of production efficiency, it is preferably about 1 to 20 minutes.

The temperature at the time of performing step B is appropriately set depending on the type of polyisocyanate component and polyol component used, the size of the granular fertilizer, etc., but the temperature in the rotating tank at which the granular fertilizer is in a rolling state, usually 40 to 100 It is the range of degreeC, Preferably it is the range of 55-75 degreeC. Further, after the addition of the mixture of the polyisocyanate component and the polyol component and the diazabicyclononene, the polyisocyanate component and the polyol component proceed to the polyisocyanate component and the polyol component to the extent that the urethane is cured and adhesion between the resin-coated granular materials does not occur. Although the rolling state of the granular fertilizer is maintained, the time to maintain the rolling state is usually about 2 to 40 minutes, and from the viewpoint of production efficiency, it is preferably about 2 to 30 minutes.

The temperature at the time of carrying out step C is appropriately set depending on the type of polyisocyanate component and polyol component used, the size of the granular fertilizer, etc., but the temperature in the rotary tank at which the granular fertilizer is in a rolling state, usually 40 to 100 It is the range of degreeC, Preferably it is the range of 55-75 degreeC. Further, after the addition of the mixture of the polyol component and the diazabicyclononene and the polyisocyanate component, the polyisocyanate component and the polyol component progress, the urethane is cured, and the degree to which adhesion between the resin-coated granular materials does not occur The rolling state of the granular fertilizer is maintained until, but the time to maintain the rolling state is usually about 2 to 40 minutes, and about 2 to 30 minutes from the point of production efficiency.

The temperature at the time of performing step D is appropriately set depending on the type of polyisocyanate component and polyol component used, the size of the granular fertilizer, etc., but the temperature in the rotary tank at which the granular fertilizer is in a rolling state, usually 40 to 100 It is the range of degreeC, Preferably it is the range of 55-75 degreeC. Further, after the addition of the polyisocyanate component, the polyol component, and the diazabicyclononene, the polyisocyanate component and the polyol component proceed to polyaddition to the extent that the urethane is cured and adhesion between the resin-coated granular materials does not occur. The rolling state of the fertilizer is maintained, but the time to maintain the rolling state is usually about 2 to 40 minutes, and about 2 to 30 minutes in terms of production efficiency.

Although the coated granular fertilizer of this invention can be manufactured by the manufacturing method containing any of said process A-D, process A is preferable from a homogeneous viewpoint of a resin film.

In the manufacturing method of the resin-coated granular fertilizer of this invention, you may implement any of the said process A - D only once. Further, any of the above steps A to D may be further repeated one or more times on the resin-coated granular material obtained by any of the above steps A to D (hereinafter, it may be described as "step E"). Here, steps A to D that are repeatedly added may be the same as or different from steps A to D performed once or a plurality of times previously performed. The thickness of the resin film can be adjusted by adjusting the frequency|count of performing the process E.

You may carry out process E successively, maintaining the rolling state of the granular fertilizer in the process before that. The polyisocyanate component and polyol component used in step E may be the same as or different from the polyisocyanate component and polyol component used in the previous step, but in terms of production efficiency, they are usually the same polyisocyanate component and A polyol component is used.

The total amount of the polyol component and the polyisocyanate component used in the production method of the resin-coated granular fertilizer of the present invention is appropriately set depending on the size and shape of the granular fertilizer used and the degree of elution control required for the resin-coated granular fertilizer to be produced. However, the total amount of the polyol component and polyisocyanate used in steps A to D and step E performed as necessary is usually about 2 to 30 parts by weight, preferably 4 to 30 parts by weight, based on 100 parts by weight of granular fertilizer. It is about 18 parts by weight.

There is no restriction|limiting in particular to an apparatus as a method of making a granular fertilizer into a rolling state, A well-known and usual thing can be used. As such an apparatus, a concrete mixer, a drum mixer, etc. are mentioned, for example. In addition, among the above devices, a device equipped with a heating facility is preferably used in terms of high precision and adjustment of processing time in the manufacturing method of the present invention.

The coated granular fertilizer of this invention may further contain resin films other than the resin film containing the urethane resin and diazabicyclononene which are polyisocyanate components and polyol components. Examples of such a resin film include a film containing a urethane resin which is a polyadduct of an optional polyisocyanate component and an optional polyol component and not containing diazabicyclononene.

The resin film may further contain components other than the urethane resin and diazabicyclononene. For example, solvents, such as an organic solvent and water, may be included, and these may be solvents used at the time of manufacture of a urethane resin. In addition, the resin film may further contain a pigment, dye, antibacterial agent, antiseptic agent, plasticizer, decomposition accelerator, and the above-described carrier depending on the purpose.

The coated granular fertilizer of the present invention may further contain other components (eg, floating prevention material, caking prevention material, agricultural chemical active ingredient, WAX, etc.) other than granular fertilizer and resinous coating.

The coated granular fertilizer of the present invention may further contain a hydrophobic liquid compound (hereinafter also referred to as "this hydrophobic liquid compound") having a boiling point of 100°C or higher. In the present invention, the hydrophobic liquid compound means a compound having fluidity at 20°C and having a water solubility of 10 ppm or less at 20°C. This hydrophobic liquid compound may be contained in the granular fertilizer, or may exist as a film covering the granular fertilizer. When this hydrophobic liquid compound exists as a film, the said film may be formed directly on the surface of a granular fertilizer, or may be formed on the resin film which coat|covers a granular fertilizer.

This hydrophobic liquid compound is mix|blended, when manufacturing resin-coated granular fertilizer using the apparatus which turns granular fertilizer into a rolling state, for example. Examples of the hydrophobic liquid compound include aliphatic hydrocarbons such as liquid paraffin, aromatic hydrocarbons such as phenylxylylethane, and alkylbenzene (specifically, Solvesso150, manufactured by ExxonMobil Chemical). 0.1-5 mass parts may be sufficient as content of the hydrophobic liquid compound in a resin coating granular fertilizer with respect to 100 mass parts of granular fertilizers.

The resin film may be formed directly on the surface of the granular fertilizer. When a film other than a resin film (for example, a film of the hydrophobic liquid compound described above) is formed on the surface of the granular fertilizer, a resin film may be formed on the film.

The resinous film may be formed so as to cover the entire surface of the granular fertilizer, or may be formed so as to cover a part of the surface of the granular fertilizer.

The thickness of the resin film can be appropriately selected according to the use and purpose of use of the resin-coated granular fertilizer. The thickness of the resin film may be, for example, 8 μm or more, and preferably 10 μm or more. In addition, the thickness of the resin film may be, for example, 400 μm or less, and preferably 200 μm or less. According to one embodiment, the thickness of the resin coating is 8 μm or more and 4200 μm or less, 8 μm or more and 200 μm or less, 10 μm or more and 400 μm or less, or 10 μm or more and 200 μm or more. less than μm. In addition, in this specification, the thickness of a resin film shows the value measured by scanning electron microscope (SEM) observation of the cross section of a resin-coated granular fertilizer. The thickness of the resin film can also be expressed as an average value of measured values of thickness at 10 points, for example. By adjusting the thickness of the resin film, the amount of elution of the fertilizer component and the form of the elution curve can be adjusted, for example.

The particle size of the coated granular fertilizer can be appropriately selected according to the use and purpose of use of the coated granular fertilizer. For example, the average particle diameter of the coated particle size fertilizer may be 0.1 to 15 mm or 1 to 5 mm. In addition, in this specification, the average particle diameter of a covered granular fertilizer is defined by the arithmetic mean value of the projected area circle equivalent diameter, and is measured by the microscopy method etc.

Example

Next, the present invention will be described in more detail by examples such as production examples, but the present invention is not limited only to these examples.

Preparation Example 1

Castor oil-modified diol (manufactured by Ito Zeyu Co., Ltd., trade name: URIC H-62, number of hydroxyl groups per molecule: 2, hydroxyl value: 274), castor oil-modified polyol (manufactured by Ito Zeyu Co., Ltd., trade name: URIC H-73X, 1 molecule Number of hydroxyl groups per sugar: 3, hydroxyl value: 270) and 1,4-butanediol (manufactured by BASF Idemitsu Co., Ltd., trade name: 1,4-BDO) were mixed at room temperature in arbitrary amounts in a weight ratio of 67.8:20.8:11.4, followed by polyol Mixture A was obtained. Then, 2677.08 g of the obtained polyol mixture A and 2.50 g of diazabicyclononene (San Afro Co., Ltd., trade name: DBN) were mixed at room temperature to obtain polyol mixture I.

50,000 g of granular urea (large urea, particle diameter of about 3 mm, spherical shape, about 60 grains per 1 g) was charged into a concrete mixer and turned into a rolling state. After heating the granular urea in a rolling state to about 66 ° C. by subjecting it to hot air from a hot air generator, liquid paraffin (manufactured by Matsumura Petroleum Laboratories, trade name: Moresco White P-350P, kinematic viscosity at 37.78 ° C.: 76 mm 2 /S) 500 g was added and the rolling state was maintained for 3 minutes. Next, a mixture obtained by rapidly stirring and mixing 267.96 g of the polyol mixture I heated to 50 ° C. and 232.29 g of aromatic diisocyanate (trade name: SBU Isocyanate J243, manufactured by Sumika Bayer Urethane) heated to 50 ° C. It was added to granular urea, and a rolling state was maintained while applying hot air from a hot air generator for 7 minutes or more. The above operations (stirring mixing of polyol mixture I and aromatic diisocyanate, addition of the mixture to granular urea in a rolling state, and rolling maintenance) was repeated to obtain the coated granular fertilizer of the present invention.

In the above manufacturing process, significant aggregation of the granular materials and adhesion of the granular materials to the inner wall of the concrete mixer were not observed, and the rolling state of the granular materials in the concrete mixer was good. Moreover, as a result of visual observation of the coated granular fertilizer obtained by the said manufacturing process, the coated state was uniform.

Preparation Example 2

50,000 g of granular urea (large urea, particle diameter of about 3 mm, spherical shape, about 60 pieces per 1 g) was put into a concrete mixer and turned into a rolling state. After heating the granular urea in a rolling state to about 66 ° C. by subjecting it to hot air from a hot air generator, liquid paraffin (manufactured by Matsumura Petroleum Laboratories, trade name: Moresco White P-350P, kinematic viscosity at 37.78 ° C.: 76 mm 2 /S) 500 g was added, and the rolling state was continued for 3 minutes. Next, a mixture obtained by rapidly stirring and mixing 200.97 g of the polyol mixture I heated to 50 ° C. and 174.22 g of aromatic diisocyanate (trade name: SBU Isocyanate J243, manufactured by Sumika Bayer Urethane) heated to 50 ° C. It was added to granular urea, and a rolling state was maintained while applying hot air from a hot air generator for 6 minutes or longer. The above operations (stirring mixing of polyol mixture I and aromatic diisocyanate, addition of the mixture to granular urea in a rolling state, and rolling maintenance) was repeated to obtain the coated granular fertilizer of the present invention.

Through the above manufacturing process, significant aggregation of the granular materials and adhesion of the granular materials to the inner wall of the concrete mixer were not observed, and the rolling state of the granular materials in the concrete mixer was good. Moreover, as a result of visual observation of the coated granular fertilizer obtained by the said manufacturing process, the coated state was uniform.

Preparation Example 3

2677.08 g of polyol mixture A and 3.50 g of diazabicyclononene (San Afro Co., Ltd., trade name: DBN) were mixed at room temperature to obtain polyol mixture II.

50,000 g of granular urea (large urea, particle diameter of about 3 mm, spherical shape, about 60 pieces per 1 g) was put into a concrete mixer and turned into a rolling state. After heating the granular urea in a rolling state to about 66 ° C. by subjecting it to hot air from a hot air generator, liquid paraffin (manufactured by Matsumura Petroleum Laboratories, trade name: Moresco White P-350P, kinematic viscosity at 37.78 ° C.: 76 mm 2 /S) 500 g was added, and the rolling state was continued for 3 minutes. Next, a mixture obtained by rapidly stirring and mixing 268.06 g of the polyol mixture II heated to 50 ° C. and 232.29 g of aromatic diisocyanate (trade name: SBU Isocyanate J243, manufactured by Sumika Bayer Urethane) heated to 50 ° C. It was added to granular urea, and a rolling state was maintained while applying hot air from a hot air generator for 7 minutes or more. The above operations (stirring mixing of polyol mixture II and aromatic diisocyanate, addition of the mixture to granular urea in a rolling state, and rolling maintenance) was repeated to obtain the coated granular fertilizer of the present invention.

Through the above manufacturing process, significant aggregation of the granular materials and adhesion of the granular materials to the inner wall of the concrete mixer were not observed, and the rolling state of the granular materials in the concrete mixer was good. Moreover, as a result of visual observation of the coated granular fertilizer obtained by the said manufacturing process, the coated state was uniform.

Comparative Preparation Example 1

50,000 g of granular urea (large urea, particle diameter of about 3 mm, spherical shape, about 60 pieces per 1 g) was put into a concrete mixer and turned into a rolling state. After heating the granular urea in a rolling state to about 66 ° C. by subjecting it to hot air from a hot air generator, liquid paraffin (product name: Moresco White P-350P, manufactured by Matsumura Oil Research Laboratories, trade name: Moresco White P-350P, kinematic viscosity at 37.78 ° C.: 76 mm 2 /S) 500 g was added, and the rolling state was continued for 3 minutes. Next, a mixture obtained by rapidly stirring and mixing 267.71 g of the polyol mixture A heated to 50 ° C. and 232.29 g of aromatic diisocyanate (trade name: SBU Isocyanate J243, manufactured by Sumika Bayer Urethane) heated to 50 ° C. It was added to granular urea, and a rolling state was maintained while applying hot air from a hot air generator for 9 minutes or more. The above operations (stirring and mixing of polyol mixture A and aromatic diisocyanate, addition of the mixture to granular urea in a rolling state, and rolling maintenance) was repeated to obtain a coated granular fertilizer for comparison.

In the manufacturing process described above, a lump in which granular materials were aggregated was partially visible, and the rolling state of the granular material in the concrete mixer was not sufficient.

Comparative Preparation Example 2

2677.08 g of polyol mixture A and 2.50 g of an ethyleneamine derivative (trade name: TOYOCAT-DB30, manufactured by Tosoh Corporation) were mixed at room temperature to obtain polyol mixture III.

Instead of polyol mixture I, except having used polyol mixture III, the same operation as in Production Example 1 was performed to obtain a coated granular fertilizer for comparison.

In the manufacturing process described above, a lump in which granular materials were aggregated was partially visible, and the rolling state of the granular material in the concrete mixer was not sufficient.

Comparative Preparation Example 3

2677.08 g of polyol mixture A and 2.50 g of 1,8-diazabicyclo (5.4.0) undecene-7 (San-Apro Co., Ltd., trade name: DBU (registered trademark)) were mixed at room temperature to obtain polyol mixture IV.

Instead of polyol mixture I, except having used polyol mixture IV, operation similar to manufacture example 1 was performed, and the coated granular fertilizer for comparison was obtained.

In the manufacturing process described above, a lump in which granular materials were aggregated was partially visible, and the rolling state of the granular material in the concrete mixer was not sufficient.

Comparative Preparation Example 4

2677.08 g of polyol mixture A and 3.50 g of 1,8-diazabicyclo (5.4.0) undecene-7 (San-Apro Co., Ltd., trade name: DBU (registered trademark)) were mixed at room temperature to obtain polyol mixture V.

Instead of the polyol mixture II, except having used the polyol mixture V, the same operation as in Production Example 3 was performed to obtain a coated granular fertilizer for comparison.

In the manufacturing process described above, a lump in which granular materials were aggregated was partially visible, and the rolling state of the granular material in the concrete mixer was not sufficient.

Comparative Preparation Example 5

2677.08 g of polyol mixture A and 2.50 g of phenol salt of 1,8-diazabicyclo (5.4.0) undecene-7 (San Afro Co., Ltd., trade name: U-CAT (registered trademark) SA-1) were mixed at room temperature. Thus, polyol mixture VI was obtained.

Instead of polyol mixture I, except having used polyol mixture VI, the same operation as in Production Example 1 was performed to obtain a coated granular fertilizer for comparison.

In the manufacturing process described above, a lump in which granular materials were aggregated was partially visible, and the rolling state of the granular material in the concrete mixer was not sufficient.

Comparative Preparation Example 6

2677.08 g of polyol mixture A and 25.0 g of 2,4,6-tris(dimethylaminomethyl)phenol (Kayak Akzo Co., Ltd., trade name: TAP) were mixed at room temperature to obtain polyol mixture VII.

50,000 g of granular urea (large urea, particle diameter of about 3 mm, spherical shape, about 60 pieces per 1 g) was put into a concrete mixer and turned into a rolling state. After heating the granular urea in a rolling state to about 66 ° C. by subjecting it to hot air from a hot air generator, liquid paraffin (product name: Moresco White P-350P, manufactured by Matsumura Oil Research Laboratories, trade name: Moresco White P-350P, kinematic viscosity at 37.78 ° C.: 76 mm 2 /S) 500 g was added, and the rolling state was continued for 3 minutes. Next, a mixture obtained by rapidly stirring and mixing 270.21 g of the above polyol mixture VII heated to 50 ° C. and 232.29 g of aromatic diisocyanate (trade name: SBU Isocyanate J243, manufactured by Sumika Bayer Urethane) heated to 50 ° C. It was added to granular urea, and a rolling state was maintained while applying hot air from a hot air generator for 10 minutes or longer. The above operation (stirring mixing of polyol mixture VII and aromatic diisocyanate, addition of the mixture to granular urea in rolling state, and rolling in maintenance) was repeated to obtain a coated granular fertilizer for comparison.

In the manufacturing process described above, a lump in which granular materials were aggregated was partially visible, and the rolling state of the granular material in the concrete mixer was not sufficient.

ADVANTAGE OF THE INVENTION According to the manufacturing method of the coated granular fertilizer of this invention, the coated granular fertilizer in which generation|occurrence|production, such as aggregation between particle|grains and adhesion of particle|grains to a transmission device, etc., can be provided.

Claims (11)

A method for producing a coated granular fertilizer comprising a granular fertilizer and a urethane resin film covering the granular fertilizer,
Process of adding a polyisocyanate component, a polyol component, and diazabicyclononene to the said granular fertilizer in a rolling state; And a process for forming the urethane resin film on the surface of the granular fertilizer by subjecting the polyisocyanate component and the polyol component to heavy addition while maintaining the rolling state of the granular fertilizer. A method for producing a coated granular fertilizer. According to claim 1,
The manufacturing method in which the addition amount of diazabicyclononene is 0.01 to 2 weight% with respect to the total amount of a polyisocyanate component and a polyol component. According to claim 1 or 2,
A manufacturing method comprising the following steps:
(a) mixing a polyisocyanate component, a polyol component, and diazabicyclononene to obtain a mixture;
(b) a step of adding the mixture obtained in the above step (a) to granular fertilizer in a rolling state, and
(c) The process of maintaining the rolling state of the granular fertilizer, adding a polyisocyanate component and a polyol component, and forming a resin film on the surface of the granular fertilizer. According to claim 1 or 2,
A manufacturing method comprising the following steps:
(a) mixing a polyisocyanate component and a polyol component to obtain a mixture;
(b) a step of separately adding the mixture obtained in step (a) and diazabicyclononene to granular fertilizer in a rolling state, and
(c) The process of maintaining the rolling state of the granular fertilizer, adding a polyisocyanate component and a polyol component, and forming a resin film on the surface of the granular fertilizer. According to claim 1 or 2,
A manufacturing method comprising the following steps:
(a) mixing a polyol component and diazabicyclononene to obtain a mixture;
(b) a step of separately adding the polyisocyanate component and the mixture obtained in the step (a) to the granular fertilizer in a rolling state, and
(c) The step of forming a resin coating on the surface of the granular fertilizer by adding a polyisocyanate component and a polyol component while maintaining the rolling state of the granular fertilizer. According to claim 1 or 2,
A manufacturing method comprising the following steps:
(a) a step of separately adding a polyisocyanate component, a polyol component, and diazabicyclononene to granular fertilizer in a rolling state, and
(b) The process of maintaining the rolling state of the granular fertilizer, adding a polyisocyanate component and a polyol component, and forming a resin film on the surface of the granular fertilizer. According to any one of claims 1 to 6,
The manufacturing method in which the said polyisocyanate component contains aromatic polyisocyanate. According to any one of claims 1 to 7,
The manufacturing method in which the said polyol component contains castor oil modified|denatured diol. According to any one of claims 1 to 7,
The manufacturing method in which the said polyol component contains two or more compounds chosen from the group which consists of a castor oil modified|denatured diol, a C2-C8 alkylene diol, and the compound which has 3 or more hydroxyl groups. According to any one of claims 1 to 8,
The manufacturing method in which the said polyol component contains a castor oil modified|denatured diol, a C2-C8 alkylene diol, and the compound which has 3 or more hydroxyl groups. A granular fertilizer and a resin film covering the granular fertilizer are provided,
The coated granular fertilizer in which the said resin film contains the urethane resin which is a polyadduct of a polyisocyanate component and a polyol component, and diazabicyclononene.