WO2023209761A1

WO2023209761A1 - Anti-caking agent composition for fertilizer

Info

Publication number: WO2023209761A1
Application number: PCT/JP2022/018692
Authority: WO
Inventors: デシラーマプリハンディニ; イスラジリハンディア
Original assignee: 花王株式会社
Priority date: 2022-04-25
Filing date: 2022-04-25
Publication date: 2023-11-02

Abstract

Provided is an anti-caking agent composition for fertilizer that has good storage stability, and that prevents the caking of a fertilizer ingredient having a caking property.　The anti-caking agent composition for fertilizer contains an ingredient (a), an ingredient (b), and an ingredient (c).　Ingredient (a): an anionic surfactant. Ingredient (b): one or more selected from among polyvinyl acetate, and a copolymer of styrene and an acrylic ester. Ingredient (c): one or more selected from among a dimethyl alkylamine, and a polyhydric alcohol having a molecular weight of 50-200 and a hydroxyl group valence of 2-6.

Description

Anti-caking agent composition for fertilizer

The present invention relates to an anti-caking agent composition for fertilizer, a fertilizer composition, a method for producing a fertilizer composition, and a method for preventing caking of fertilizer components.

Background Art Granular fertilizer components such as chemical fertilizers have a problem of caking due to moisture in the product. In chemical fertilizers, recrystallization of the dissolved fertilizer solution after absorbing moisture is thought to be the cause of caking.
In order to deal with the problem of caking in granular fertilizers, various methods for preventing caking have been proposed, such as the use of coating materials and improvements in the granulation process. However, there is no known satisfactory caking prevention method that can be applied to fertilizer components that have simple manufacturing processes and low manufacturing costs without sacrificing their economic and commercial advantages.

JP-A No. 62-275084 discloses a method that contains a water-insoluble synthetic polymer compound such as polyvinyl acetic acid, a specific anionic surfactant such as sodium octyl sulfate, and a wet spreading fixing agent such as polyvinyl alcohol. An anti-caking agent for fertilizers is disclosed.
Japanese Patent Publication No. 49-17827 discloses that an aqueous solution containing a non-dissociable water-soluble polymer compound such as polyvinyl alcohol or sodium polyacrylate and a specific anionic surfactant such as sodium decyl sulfate or sodium octyl sulfate is solidified. Disclosed is a method for preventing caking of a caking fertilizer, which is characterized by adding the compound to a caking fertilizer and substantially removing water after the addition.
Japanese Patent Publication No. 49-17104 discloses that an aqueous solution obtained by solubilizing a water-insoluble synthetic polymer compound such as polyvinyl acetate with a concentrated aqueous solution containing an alkyl sulfate having an alkyl group having 6 to 10 carbon atoms is A method for preventing caking of a caking fertilizer is disclosed, which comprises adding the compound to the caking fertilizer either diluted or as is, and substantially removing water after addition.

Summary of the Invention The present invention provides an anti-caking agent composition for fertilizers that has good storage stability and prevents caking of fertilizer components with caking properties, and a fertilizer composition with reduced caking properties of fertilizer components. , a method for producing the same, and a method for preventing caking of fertilizer components.

The present invention relates to an anti-caking agent composition for fertilizer containing the following components (a), (b), and (c).
Component (a): Anionic surfactant Component (b): One or more types selected from a copolymer of styrene and acrylic acid ester, and polyvinyl acetate Component (c): Dimethylalkylamine (hereinafter referred to as component (c1)) and one or more polyhydric alcohols having a molecular weight of 50 or more and 200 or less and a hydroxyl group valence of 2 or more and 6 or less (hereinafter referred to as component (c2))

The present invention also relates to a fertilizer composition containing the anti-caking agent composition for fertilizers of the present invention and fertilizer components.

The present invention also relates to a method for producing a fertilizer composition, in which the surfaces of particles of fertilizer components are coated with the anti-caking agent composition for fertilizers of the present invention.

The present invention also relates to a method for preventing caking of fertilizer components, which comprises coating the surfaces of particles of fertilizer components with the anti-caking agent composition for fertilizers of the present invention.

According to the present invention, an anti-caking agent composition for fertilizers that has good storage stability and prevents caking of fertilizer components with caking properties, a fertilizer composition with reduced caking properties of fertilizer components, A method for manufacturing the same, and a method for preventing caking of fertilizer components are provided.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The reason why the anti-caking agent composition for fertilizers of the present invention is able to prevent caking of fertilizer components having caking properties is not necessarily certain, but it is presumed as follows.
The anionic surfactant of component (a) adsorbs onto the surface of the fertilizer, thereby making the surface of the fertilizer hydrophobic. It is thought that this makes it difficult for water to act on the fertilizer surface.
On the other hand, the specific polymer of component (b) exhibits anti-caking properties by forming a thin polymer film on the fertilizer surface, thereby suppressing the action of water on the fertilizer surface and contact between fertilizer particles. Presumed.
Furthermore, among component (c), component (c1) dimethylalkylamine is presumed to adsorb onto the fertilizer surface, making the fertilizer surface hydrophobic and reducing the action of water, similar to component (a).
In addition, among component (c), the specific polyhydric alcohol of component (c2) exhibits an anti-caking effect by reducing the amount of water acting on the fertilizer surface by capturing moisture itself. Presumed.
Surprisingly, these components (a), (b), and (c) act complementary to each other on the surface of the fertilizer, resulting in a synergistic anti-caking effect, and the effects of the present invention were obtained. considered to be a thing.

[Anti-caking agent composition for fertilizer]
<Component (a)>
Component (a) of the present invention is an anionic surfactant.
Component (a) includes one or more selected from alkyl or alkenyl sulfates, alkanesulfonic acids, olefinsulfonic acids, fatty acids, and salts thereof. The salt of component (a) may be, for example, an alkali metal salt such as a sodium salt or potassium salt, or an ammonium salt.

Component (a) is preferably an alkyl or alkenyl sulfate or a salt thereof, more preferably an alkyl or alkenyl sulfate having 6 or more and 18 or less carbon atoms or a salt thereof, from the viewpoint of anti-caking properties of the fertilizer. The number of carbon atoms is the number of carbon atoms in an alkyl group or an alkenyl group.
From the viewpoint of anti-caking properties of fertilizer, the alkyl group or alkenyl group has a carbon number of 6 or more, preferably 8 or more, more preferably 10 or more, and 18 or less, preferably 16 or less, more preferably 14 or less. and is linear or branched, preferably linear. Further, the carbon of the alkyl group or alkenyl group bonded to the sulfate ester group is preferably primary carbon from the viewpoint of formulation stability of the anti-caking agent composition for fertilizer. From the viewpoint of anti-caking properties of the fertilizer, component (a) is preferably, for example, lauryl sulfate having 12 carbon atoms or a salt thereof.

<Component (b)>
Component (b) of the present invention is one or more selected from a copolymer of styrene and acrylic ester (hereinafter referred to as component (b1)) and polyvinyl acetate (hereinafter referred to as component (b2)).

In component (b1), the constituent monomer styrene includes one or more selected from styrene, methylstyrene, dimethylstyrene, trimethylstyrene, butylstyrene, acetoxystyrene, and methoxystyrene. Styrene is preferred from the viewpoint of anti-caking properties of fertilizers.
In component (b1), the number of carbon atoms in the ester moiety of the acrylic ester as a constituent monomer is preferably 2 or more, more preferably 7 or more, still more preferably 9 or more, from the viewpoint of anti-caking properties of the fertilizer, and Preferably it is 17 or less, more preferably 15 or less, still more preferably 13 or less. The number of carbon atoms in the ester moiety is the number of carbon atoms including the carbon in -C(O)-O-R ^1b (R ^1b is a hydrocarbon group) and -C(O)-O-. R ^1b is a hydrocarbon group, preferably a straight-chain or branched alkyl group or a straight-chain or branched alkenyl group, more preferably a straight-chain or branched alkenyl group, from the viewpoint of anti-caking properties of fertilizers. It is an alkyl group, more preferably a branched alkyl group.
In component (b1), the acrylic ester as a constituent monomer includes one or more selected from 2-ethylhexyl acrylate, n-octyl acrylate, and dodecyl acrylate.

In component (b1), the molar ratio of the constituent monomers styrene and acrylic ester (styrene/acrylic ester) is preferably 0.6 or more, more preferably 0.6 from the viewpoint of anti-caking properties of the fertilizer. It is 7 or more, more preferably 0.75 or more, and preferably 2.0 or less, more preferably 1.5 or less, even more preferably 1.0 or less, and even more preferably 0.9 or less.

Component (b1) may be a copolymer containing a monomer other than styrene and acrylic ester and copolymerizable with styrene and/or acrylic ester, as long as it does not impede the effects of the present invention. . Monomers other than styrene and acrylic esters that can be copolymerized with styrene and/or acrylic esters include vinyl monomers, acrylic monomers, and the like.
In component (b1), the total amount of styrene and acrylic acid ester in all constituent monomers is preferably 60 mol% or more, more preferably 70 mol% or more, still more preferably 80 mol% or more, from the viewpoint of anti-caking properties of the fertilizer. It is mol% or more, more preferably 90 mol% or more, and preferably 100 mol% or less, and may be 100 mol%.

The weight average molecular weight of component (b1) is preferably 50,000 or more, more preferably 100,000 or more, even more preferably 200,000 or more, and preferably 1,000,000 from the viewpoint of anti-caking property. It is more preferably 800,000 or less, still more preferably 400,000 or less.
The weight average molecular weight of component (b1) is determined by gel permeation chromatography (GPC) using a mixed solution of acetonitrile and water (phosphate buffer) as a developing solvent and polyethylene glycol as a standard.

Component (b2) may be a copolymer containing a monomer other than vinyl acetate and copolymerizable with vinyl acetate, as long as the effects of the present invention are not impaired. Monomers other than vinyl acetate that can be copolymerized with vinyl acetate include vinyl monomers, acrylic monomers, styrene monomers, and the like.
In component (b2), the content of vinyl acetate in all constituent monomers is preferably 60 mol% or more, more preferably 70 mol% or more, still more preferably 80 mol% or more, from the viewpoint of anti-caking properties of the fertilizer. , more preferably 90 mol% or more, and preferably 100 mol% or less, and may be 100 mol%.

The weight average molecular weight of component (b2) is preferably 10,000 or more, more preferably 100,000 or more, still more preferably 300,000 or more, and preferably 1,000 or more, from the viewpoint of anti-caking properties of the fertilizer. ,000 or less, more preferably 800,000 or less, still more preferably 500,000 or less, even more preferably 300,000 or less.
The weight average molecular weight of component (b2) is determined by gel permeation chromatography (GPC) using a mixed solution of acetonitrile and water (phosphate buffer) as a developing solvent and polyethylene glycol as a standard.

<Component (c)>
Component (c) of the present invention includes dimethylalkylamine (hereinafter referred to as component (c1)) and a polyhydric alcohol having a molecular weight of 50 to 200 and a hydroxyl group valency of 2 to 6 (hereinafter referred to as component (c2)). )).

The number of carbon atoms in the alkyl group of component (c1) is preferably 8 or more, more preferably 12 or more, still more preferably 14 or more, even more preferably 16 or more, and preferably It is 22 or less, more preferably 18 or less.
The alkyl group of component (c1) is linear or branched, preferably linear.
Component (c1) includes one or more selected from dimethyloctylamine, dimethyldecylamine, dimethyllaurylamine, dimethylbehenylamine, dimethylcoconutamine, dimethylmyristylamine, dimethylpalmitylamine, and dimethylstearylamine. .
Component (c1) is preferably one or more selected from dimethyllaurylamine, dimethylmyristylamine, dimethylpalmitylamine, and dimethylstearylamine, and more preferably dimethylstearylamine, from the viewpoint of anti-caking properties of the fertilizer.

From the viewpoint of preventing fertilizer caking, the molecular weight of component (c2) is 50 or more, preferably 60 or more, more preferably 70 or more, and 200 or less, preferably 190 or less, more preferably 180 g/mol or less, More preferably it is 150 or less, even more preferably 120 or less.
The valence of the hydroxyl group in component (c2) is 2 or more and 6 or less, preferably 4 or less, from the viewpoint of preventing caking of the fertilizer.

Component (c2) includes ethylene glycol (molecular weight 62.07; hydroxyl number 2), propylene glycol (molecular weight 76.09; hydroxyl number 2), diethylene glycol (molecular weight 106.12; hydroxyl number 2), dipropylene. Glycol (molecular weight 134.17; hydroxyl number 2), glycerin (molecular weight 92.09; hydroxyl number 3), xylitol (molecular weight 152.15; hydroxyl number 5), mannitol (molecular weight 182.17; hydroxyl number 6) ), sorbitol (molecular weight 182.17; hydroxyl value number 6).
From the viewpoint of anti-caking properties of the fertilizer, component (c2) is preferably one or more selected from ethylene glycol, diethylene glycol, glycerin, and sorbitol, and more preferably one or more selected from diethylene glycol, glycerin, and sorbitol.

From the viewpoint of preventing caking of the fertilizer, component (c2) is preferably a polyhydric alcohol that is liquid at 25°C.
Polyhydric alcohols that are liquid at 25°C include ethylene glycol (melting point: -13°C), propylene glycol (melting point: -59°C), diethylene glycol (melting point: -8°C), and dipropylene glycol (melting point: -39°C). , and glycerin (melting point: -39°C).

<Composition, etc.>
The anti-caking agent composition for fertilizers of the present invention contains component (a), preferably at least 1% by mass, more preferably at least 5% by mass, from the viewpoint of uniform mixability of the anti-caking agent composition for fertilizers. More preferably 10% by mass or more, even more preferably 15% by mass or more, and preferably 30% by mass or less, more preferably 25% by mass or less, still more preferably 20% by mass or less, even more preferably 19% by mass or less. contains.
In the present invention, the mass of component (a) is defined using a value converted to sodium salt.

The anti-caking agent composition for fertilizers of the present invention contains component (b), preferably 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably is 1% by mass or more, even more preferably 2% by mass or more, and preferably 15% by mass or less, more preferably 12% by mass or less, still more preferably 10% by mass or less, even more preferably 5% by mass or less, and more preferably More preferably, the content is 4% by mass or less.

The anti-caking agent composition for fertilizers of the present invention preferably contains component (c) in an amount of 0.5% by mass or more, more preferably 1% by mass or more, still more preferably 1% by mass, from the viewpoint of anti-caking properties of fertilizers. Contains .5% by mass or more, even more preferably 2% by mass or more, and preferably 30% by mass or less, more preferably 20% by mass or less, still more preferably 15% by mass or less, even more preferably 10% by mass or less. .

When the anti-caking agent composition for fertilizers of the present invention contains component (c1), the content of component (c1) is preferably 0.5% by mass or more, more preferably Contains 1% by mass or more, more preferably 1.5% by mass or more, even more preferably 2% by mass or more, and preferably 5% by mass or less, more preferably 4% by mass or less, still more preferably 3% by mass or less. .

When the anti-caking agent composition for fertilizers of the present invention contains component (c2), the content of component (c2) is preferably 0.5% by mass or more, more preferably 1% by mass or more, more preferably 1.5% by mass or more, even more preferably 5% by mass or more, even more preferably 8% by mass or more, and preferably 20% by mass or less, more preferably 15% by mass or less, The content is more preferably 12% by mass or less, even more preferably 10% by mass or less.

In the anti-caking agent composition for fertilizers of the present invention, the mass ratio (c)/(a) between the content of component (a) and the content of component (c) is determined from the viewpoint of anti-caking properties of the fertilizer. , preferably 0.05 or more, more preferably 0.06 or more, even more preferably 0.07 or more, and preferably 3 or less, more preferably 2 or less, still more preferably 1 or less, even more preferably 0.6 Below, it is still more preferably 0.3 or less.

When the anti-caking agent composition for fertilizers of the present invention contains component (c1), the mass ratio (c1)/(a) of the content of component (a) and the content of component (c1) is: From the viewpoint of anti-caking properties of fertilizer, it is preferably 0.05 or more, more preferably 0.06 or more, even more preferably 0.07 or more, and preferably 3 or less, more preferably 2 or less, still more preferably 1 Below, it is still more preferably 0.6 or less, even more preferably 0.3 or less.

When the anti-caking agent composition for fertilizers of the present invention contains component (c2), the mass ratio (c2)/(a) of the content of component (a) and the content of component (c2) is: From the viewpoint of anti-caking properties of fertilizer, it is preferably 0.05 or more, more preferably 0.06 or more, even more preferably 0.07 or more, and preferably 15 or less, more preferably 12 or less, even more preferably 10 Below, it is still more preferably 3 or less.

In the anti-caking agent composition for fertilizers of the present invention, the mass ratio of the total content of component (a) and component (c) to the content of component (b) (b)/[(a)+(c) ] is preferably 0.01 or more, more preferably 0.02 or more, even more preferably 0.03 or more, and preferably 1.5 or less, more preferably 1. It is 0 or less, more preferably 0.5 or less.

When the anti-caking agent composition for fertilizer of the present invention contains component (c1), the mass ratio (b) of the total content of component (a) and component (c1) to the content of component (b) /[(a)+(c1)] is preferably 0.01 or more, more preferably 0.02 or more, even more preferably 0.03 or more, and preferably 1 .5 or less, more preferably 1.0 or less, still more preferably 0.7 or less, even more preferably 0.5 or less.

When the anti-caking agent composition for fertilizer of the present invention contains component (c2), the mass ratio (b) of the total content of component (a) and component (c2) to the content of component (b) /[(a)+(c2)] is preferably 0.01 or more, more preferably 0.02 or more, still more preferably 0.03 or more, and preferably 1 .5 or less, more preferably 1.0 or less, still more preferably 0.7 or less, even more preferably 0.5 or less.

The anti-caking agent composition for fertilizers of the present invention contains water. That is, the anti-caking agent composition for fertilizer of the present invention is a liquid composition containing water. Examples of water include, but are not limited to, tap water, well water, ion exchange water, distilled water, and the like. The anti-caking agent composition for fertilizers of the present invention contains water preferably at least 20% by mass, more preferably at least 30% by mass, still more preferably at least 40% by mass, even more preferably at least 50% by mass, and even more preferably at least 50% by mass. The content is preferably 60% by mass or more, and preferably 98% by mass or less, more preferably 96% by mass or less, and still more preferably 80% by mass or less.

The anti-caking agent composition for fertilizers of the present invention may contain other ingredients such as various crushed ore products, various oils, and starches (with the exception of ingredient (a), ingredient (b), excluding component (c)).

The viscosity at 25°C of the anti-caking agent composition for fertilizers of the present invention is preferably 500 mPa·s or less, more preferably 300 mPa·s or less, still more preferably 200 mPa·s or less, from the viewpoint of uniformly coating the fertilizer surface. be. The lower limit of the viscosity may be 0 mPa·s or more. This viscosity was measured at 30°C using a B-type viscometer.

The anti-caking agent composition for fertilizers of the present invention can be used to prevent caking of fertilizer components by coating the particle surfaces of the fertilizer components. The fertilizer components are the same as those described in the fertilizer composition of the present invention below.

[Fertilizer composition and method for producing the same]
The present invention provides a fertilizer composition containing the anti-caking agent composition for fertilizer of the present invention and a fertilizer component.
The present invention also provides a fertilizer composition containing component (a), component (b), component (c), and fertilizer components.
The fertilizer composition of the present invention can appropriately apply the embodiments described in the anti-caking agent composition for fertilizers of the present invention. The regulations regarding component (a), component (b), component (c), and the mass ratio of each component are the same as those described in the anti-caking agent composition for fertilizer of the present invention.

Specifically, fertilizer components include nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, boron, iron, manganese, copper, zinc, molybdenum, chlorine, silicon, sodium, etc., especially nitrogen, phosphorus, potassium, calcium, Examples include inorganic substances and organic substances that serve as sources of magnesium. Such inorganic substances include ammonium nitrate, potassium nitrate, ammonium sulfate, ammonium chloride, ammonium phosphate, sodium nitrate, urea, ammonium carbonate, potassium phosphate, lime superphosphate, and fused phosphorus fertilizer (3MgO・CaO・P ₂ O ₅ -3CaSiO ₂ ), potassium sulfate, potassium salt, lime nitrate, slaked lime, lime carbonate, magnesium sulfate, magnesium hydroxide, magnesium carbonate, and the like. In addition, organic substances include chicken manure, cow manure, bark compost, amino acids, peptone, millet extract, fermented extract, calcium salts of organic acids (citric acid, gluconic acid, succinic acid, etc.), fatty acids (formic acid, acetic acid, propionic acid, Examples include calcium salts of caprylic acid, capric acid, caproic acid, etc.).

Fertilizer components are solid particles. From the viewpoint of anti-caking properties, the average particle size of the fertilizer component is preferably 0.01 mm or more, more preferably 0.1 mm or more, even more preferably 1 mm or more, and preferably 10 mm or less, more preferably 5 mm or less. be. The average particle size of the fertilizer component is the number average size based on 100 randomly selected particles observed with an optical microscope. If there is a major axis and a minor axis, measure the major axis.

The fertilizer composition of the present invention contains the anti-caking agent composition for fertilizer of the present invention in an amount of preferably 50 ppm or more, more preferably 100 ppm or more, based on the mass of the fertilizer component, from the viewpoint of the anti-caking property of the fertilizer. More preferably, it contains 200 ppm or more, even more preferably 1,000 ppm or more, even more preferably 2,000 ppm or more, and preferably 5,000 ppm or less, more preferably 4,000 ppm or less, and even more preferably 3,000 ppm or less. .

The fertilizer composition of the present invention preferably contains component (a) in an amount of 20 ppm or more, more preferably 100 ppm or more, still more preferably 300 ppm or more, based on the mass of the fertilizer component, from the viewpoint of anti-caking properties of the fertilizer. , preferably 600 ppm or less, more preferably 500 ppm or less, still more preferably 400 ppm or less.

The fertilizer composition of the present invention preferably contains component (b) in an amount of 20 ppm or more, more preferably 40 ppm or more, still more preferably 60 ppm or more, based on the mass of the fertilizer component, from the viewpoint of anti-caking properties of the fertilizer. , preferably 300 ppm or less, more preferably 200 ppm or less, still more preferably 100 ppm or less.

The fertilizer composition of the present invention preferably contains component (c) in an amount of 1 ppm or more, more preferably 20 ppm or more, still more preferably 40 ppm or more, based on the mass of the fertilizer component, from the viewpoint of anti-caking properties of the fertilizer. , preferably 600 ppm or less, more preferably 400 ppm or less, still more preferably 200 ppm or less.

When the fertilizer composition of the present invention contains component (c1), the amount of component (c1) is preferably 5 ppm or more, more preferably 10 ppm, based on the mass of the fertilizer component, from the viewpoint of anti-caking properties of the fertilizer. The content is more preferably 20 ppm or more, more preferably 100 ppm or less, more preferably 80 ppm or less, still more preferably 60 ppm or less.

When the fertilizer composition of the present invention contains component (c2), the amount of component (c2) is preferably 1 ppm or more, more preferably 10 ppm, based on the mass of the fertilizer component, from the viewpoint of anti-caking properties of the fertilizer. The content is more preferably 30 ppm or more, and preferably 400 ppm or less, more preferably 300 ppm or less, and still more preferably 200 ppm or less.

In the fertilizer composition of the present invention, the particle surfaces of fertilizer components are coated with the fertilizer anti-caking agent composition of the present invention. That is, the fertilizer composition of the present invention prevents moisture absorption and recrystallization on the particle surface of the fertilizer component by coating the particle surface of the fertilizer component with component (a), component (b), and component (c). can be prevented and the caking of the fertilizer composition can be reduced.

The fertilizer composition of the present invention is solid particles. The average particle size of the fertilizer composition of the present invention is preferably 0.01 mm or more, more preferably 0.1 mm or more, still more preferably 1 mm or more, and preferably 10 mm or less, from the viewpoint of anti-caking properties of the fertilizer. More preferably, it is 5 mm or less. The average particle size of the fertilizer composition is the number average size based on 100 randomly selected particles observed with an optical microscope. If there is a major axis and a minor axis, measure the major axis.

The fertilizer composition of the present invention is preferably produced by coating the surface of particles of fertilizer components with the anti-caking agent composition for fertilizers of the present invention.
That is, the present invention provides a method for producing a fertilizer composition, in which the surfaces of particles of fertilizer components are coated with the anti-caking agent composition for fertilizer of the present invention.
In the method for producing the fertilizer composition of the present invention, the embodiments described for the anti-caking agent composition for fertilizers and the fertilizer composition of the present invention can be applied as appropriate.

As a method for coating, the anti-caking agent composition for fertilizers of the present invention may be sprayed or applied, preferably sprayed, onto the particle surface of the fertilizer component. After spraying, the fertilizer may be dried by dry air, hot air, heat treatment, etc. By this method, a fertilizer composition in which the particle surfaces of fertilizer components are coated with component (a), component (b), and component (c) can be produced. The method of spraying the anti-caking agent composition for fertilizer of the present invention onto the surface of particles of fertilizer components can be carried out, for example, while the fertilizer components are being conveyed on a belt conveyor, or when they are falling as a stream from a conveyor or the like. A method of spraying an anti-caking agent composition for fertilizer during this period is mentioned.

The coating treatment amount of the anti-caking agent composition for fertilizers of the present invention is preferably 500 ppm or more, more preferably 800 ppm or more, still more preferably 1 ,000 ppm or more, more preferably 2,000 ppm or more, and preferably 5,000 ppm or less, more preferably 4,000 ppm or less, still more preferably 3,000 ppm or less.

After the particle surface of the fertilizer component is spray coated with the anti-caking agent composition for fertilizer of the present invention, the fertilizer composition is dried at a room temperature of 10°C or more and 40°C or less, or the fertilizer composition is coated with the fertilizer composition at 50°C or more. It may be dried by blowing hot air at 200°C or less.

[Method for preventing caking of fertilizer components]
The present invention provides a method for preventing caking of fertilizer components, which comprises coating the surfaces of particles of fertilizer components with the anti-caking agent composition for fertilizers of the present invention.
The method for preventing caking of fertilizer components of the present invention can appropriately apply the embodiments described in the anti-caking agent composition for fertilizers of the present invention, the fertilizer composition of the present invention, and the manufacturing method thereof. The method of coating the particle surface of the fertilizer component with the anti-caking agent composition for fertilizer of the present invention is the same as the embodiment described in the method for producing the fertilizer composition of the present invention.

Examples The ingredients used in Examples and Comparative Examples are summarized below.

<Component (a)>
・Sodium lauryl sulfate: "Emar 24D", manufactured by Kao Corporation

<Component (b)>
・Styrene-2-ethylhexyl acrylate copolymer: component (b1), "EBL6948", manufactured by Eternal, molar ratio (styrene/acrylic acid ester) 0.77, weight average molecular weight 300,000 ・Polyvinyl acetate: component (b2), "ALFACOAT 5408AC", manufactured by ALFA POLIMER, weight average molecular weight 200,000

<Component (c)>
・Dimethylstearylamine: Ingredient (c1), "Pharmin DM8098" manufactured by Kao Corporation ・Dimethylpalmitylamine: Component (c1), "Pharmin DM6098" manufactured by Kao Corporation ・Dimethylmyristylamine: Component (c1), "Pharmin DM4098" ” Manufactured by Kao Corporation, dimethyl laurylamine: component (c1), “Pharmin DM2098” manufactured by Kao Corporation, glycerin: component (c2), molecular weight 92.09, number of hydroxyl groups 3, manufactured by Wilmer Corporation, sorbitol: component (c2) ), molecular weight 182.17, hydroxyl number 6, manufactured by Kao Corporation, diethylene glycol: component (c2), molecular weight 106.12, hydroxyl number 2, manufactured by Fuji Film Wako Pure Chemical Industries, Ltd., ethylene glycol: component (c2) , molecular weight 62.07, hydroxyl value number 2, manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.

[Preparation of anti-caking agent composition for fertilizer]
A predetermined amount of water and an emulsion of component (b) were mixed and stirred at 50°C for 30 minutes. Component (c) was further added to this mixed solution, and the mixture was further stirred at 50° C. for 30 minutes. Thereafter, component (a) was further added to this liquid mixture and stirred for 60 minutes to obtain an anti-caking agent composition for fertilizer.

[Evaluation of anti-caking property]
Fertilizer anti-caking agent prepared by passing particulate NPK fertilizer components (N (nitrogen): P (phosphorus): K (potassium) = 1:1:1 (mass ratio)) through a sieve with a 4 mm opening. A fertilizer composition was prepared by uniformly spraying the composition onto the particle surface of the NPK fertilizer component using a sprayer so that the coating amount was as shown in Table 1.
80 g of the prepared fertilizer composition was filled into a cylindrical mold with a height of 70 mm and a diameter of 48 mm with ventilation holes on the side, and after closing the lid while applying a pressure of 109 kPa, the mold was placed in an atmosphere of 30° C. and 75% relative humidity. It was stored in a constant temperature bath for 2 days at 40° C. and 20% relative humidity.
After storage, the solidified fertilizer composition was taken out from the mold and tested at a compression speed of 10 mm/min using a compressive strength tester (model HT-2402, manufactured by Hung Ta Instrument Co., Ltd.). The strength (kgf) at which the solidified fertilizer composition collapses was measured. The results are shown in Table 1. A lower collapse strength means that the fertilizer composition is free from caking, and caking is prevented. Note that the collapse strength in the case of using only the NPK fertilizer component without coating with the anti-caking agent composition for fertilizer was 56.6 kgf.

[Evaluation of storage stability]
After the prepared anti-caking agent composition for fertilizer was allowed to stand for a predetermined period of time in a constant temperature room at 25° C., the presence or absence of liquid separation and its properties were visually observed and judged according to the following criteria. The results are shown in Table 1.
〇: Liquid does not separate for more than 7 days ×: Liquid separates in less than 7 days

Claims

An anti-caking agent composition for fertilizers containing the following components (a), (b), and (c).
Component (a): Anionic surfactant Component (b): One or more types selected from a copolymer of styrene and acrylic acid ester, and polyvinyl acetate Component (c): Dimethylalkylamine (hereinafter referred to as component (c1)) and one or more polyhydric alcohols having a molecular weight of 50 or more and 200 or less and a hydroxyl group valence of 2 or more and 6 or less (hereinafter referred to as component (c2))
The anti-caking agent composition for fertilizers according to claim 1, wherein component (a) is one or more selected from alkyl or alkenyl sulfates, alkanesulfonic acids, olefinsulfonic acids, fatty acids, and salts thereof.
The anti-caking agent composition for fertilizers according to claim 1 or 2, wherein component (a) is an alkyl or alkenyl sulfate or a salt thereof.
The anti-caking agent composition for fertilizer according to any one of claims 1 to 3, wherein component (a) is lauryl sulfate or a salt thereof.
The anti-caking agent composition for fertilizer according to any one of claims 1 to 4, which contains component (a) in an amount of 1% by mass or more and 30% by mass or less.
The anti-caking agent composition for fertilizer according to any one of claims 1 to 5, wherein component (b) is a copolymer of styrene and acrylic ester.
The anti-caking agent composition for fertilizers according to any one of claims 1 to 6, wherein component (b) is a copolymer of styrene and 2-ethylhexyl acrylate.
The anti-caking agent composition for fertilizer according to any one of claims 1 to 7, which contains component (b) in an amount of 0.1% by mass or more and 15% by mass or less.
The anti-caking agent composition for fertilizer according to any one of claims 1 to 8, wherein component (c) is component (c1).
The anti-caking agent composition for fertilizers according to claim 9, wherein component (c1) is dimethylalkylamine in which the alkyl group has 8 or more carbon atoms and 22 or less carbon atoms.
The anti-caking agent composition for fertilizer according to claim 9 or 10, which contains component (c1) in an amount of 0.5% by mass or more and 5% by mass or less.
The anti-caking agent composition for fertilizer according to any one of claims 1 to 8, wherein component (c) is component (c2).
The anti-caking agent composition for fertilizer according to claim 12, wherein component (c2) is a polyhydric alcohol that is liquid at 25°C.
The anti-caking agent composition for fertilizers according to claim 12 or 13, wherein component (c2) is one or more selected from ethylene glycol, diethylene glycol, glycerin, and sorbitol.
The anti-caking agent composition for fertilizer according to any one of claims 12 to 14, which contains component (c2) in an amount of 0.5% by mass or more and 20% by mass or less.
The mass ratio (c)/(a) of the content of component (a) to the content of component (c) is 0.05 or more and 3 or less, according to any one of claims 1 to 15. Anti-caking agent composition for fertilizer.
The mass ratio (b)/[(a)+(c)] of the total content of component (a) and component (c) to the content of component (b) is 0.01 or more and 1.5 or less. , the anti-caking agent composition for fertilizer according to any one of claims 1 to 16.
A fertilizer composition containing the anti-caking agent composition for fertilizer according to any one of claims 1 to 17 and a fertilizer component.
The fertilizer composition according to claim 18, wherein the particles have an average particle size of 0.01 mm or more and 10 mm or less.
A method for producing a fertilizer composition, comprising coating the surface of particles of a fertilizer component with the anti-caking agent composition for fertilizer according to any one of claims 1 to 17.
The method for producing a fertilizer composition according to claim 18, wherein the coating amount of the anti-caking agent composition for fertilizer is 50 ppm or more and 5000 ppm or less based on the mass of the fertilizer component.
A method for preventing caking of a fertilizer component, comprising coating the surface of particles of the fertilizer component with the anti-caking agent composition for fertilizer according to any one of claims 1 to 17.