JPH10109902A - Granular carrier floating on water surface for agricultural purpose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a granular carrier which can be efficiently spread to the needed areas in rice paddies and by which effective components such as agrochemicals and fertilizers held in the granules can be uniformly distributed by granulating a mixture of powders of an organic material and a water-soluble macromolecular material into granules of a specific form. SOLUTION: Powders of an organic material and a water-soluble macromolecular material are mixed and granulated in a porous form. The granules as a granular carrier are suitably formed so that they can float on the water surface for more than 10 minutes. The weight ratio of the organic powder to the water-soluble polymer is suitable in the range of 99/1-60/40, preferably 97/3-80/20. As the organic powder, is suitable charcoal because it is stably, inexpensively and continuously available. The size of the powder is preferably <=500μm, particularly <=200μm. The water-soluble macromolecular molecule is preferably a powder of natural polymers such as starch or methylcellulose and their particle size is preferably <=500μm, particularly <=200μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a water-floating, agricultural water-dispersible granular material which is used to hold a pesticide or fertilizer in a paddy field, etc., and to efficiently and uniformly diffuse the active ingredient of the pesticide or fertilizer into water. Carrier.

[0002]

2. Description of the Related Art Conventional agricultural chemicals for paddy fields are formulated into dusts, wettable powders, emulsions or granules, and applied to the water surface or rice body. The above-mentioned powders and wettable powders have health and environmental problems for the user due to dusting, and in the case of the emulsion, the health and the flammability of the user due to the toxicity of the organic solvent are high. There is a fire problem due to. On the other hand, granules do not have the above-mentioned problems, but conventional ones, when they are sprayed on the water surface in paddy fields without using any special equipment, the diffusion of the active ingredient, etc. However, there is a problem that it is not always performed properly, and uneven distribution is likely to occur.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and is particularly effective in improving the health of users and the like.
The active ingredient of pesticides or fertilizers that are efficiently expanded to the required area of paddy fields and retained by taking advantage of and improving the advantages of granules that have no problems such as environmental and fire risks It is an object of the present invention to provide an agricultural water-floating granular carrier capable of dispersing water uniformly throughout.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention is an agriculturally water-suspendable granular carrier formed by granulating a mixture of an organic material powder and a water-soluble polymer material powder into porous granules.

[0005] As the organic material powder, for example, grass, firgrass, peanut shell, peat moss, wood flour and the like can be used. These can be used as a single powder or a mixed powder of two or more. All of these have a sufficient function of retaining the active ingredient of pesticides or fertilizers, and there is no significant difference in that respect, but wood flour is suitable in the sense that it is continuously available at a low cost. It is. The size of these organic material powders is 500 μm from the viewpoint of granulation.
m or less, particularly preferably 200 μm or less.

Examples of the water-soluble polymer powder include starch, carboxymethylcellulose, methylcellulose, ethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, sodium alginate, guar gum, xanthan gum, bean gum, carrageenan, gluten and the like. Among them, starch,
Natural polymer powders such as carboxymethylcellulose, methylcellulose, ethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, guar gum and gluten are preferred in that they can be decomposed in nature. These water-soluble polymer material powders can be used as a single powder or a mixed powder of two or more. Of the above, methyl cellulose is more preferred. This is because the granular carrier, which is a granulated product with the organic material powder, does not easily absorb moisture during storage and has little change with time. The size of these water-soluble polymer powders is preferably 500 μm or less, more preferably 200 μm or less from the viewpoint of granulation.

[0007] The weight ratio of the organic material powder and the water-soluble polymer material powder varies depending on the type, but is generally in the range of 99: 1 to 60:40.
Preferably, it is between 97: 3 and 80:20. If the amount of the water-soluble polymer material powder is less than 1%, the granular carrier, which is a granulated product of both powders, has insufficient buoyancy, and even if it is used in excess of 40%, the buoyancy does not improve so much. This is not desirable from an appropriate viewpoint. The reason for the change in the buoyancy of the granulated material depending on the ratio of the water-soluble polymer material powder is not always clear, but it is thought that if the ratio is too small, the obtained granular material will not easily become porous. Can be

[0008] By the way, it is appropriate that the granular material as the granular carrier is configured to be able to float on the water surface for 10 minutes or more while keeping its shape in a granular state. That is, when a granular carrier holding an active ingredient of a pesticide or a fertilizer is thrown onto a water surface in a paddy field, the granular carrier spreads to a sufficiently wide range due to the influence of wind in a natural state and the like. Because that much time is needed. Such particulate matter that can be suspended on the water surface for 10 minutes or more can be obtained by appropriately selecting the ratio of the organic material powder and the water-soluble polymer material powder, their types, and the granulation method. Naturally, apparent specific gravity is also an important factor.

[0009] If necessary, a surfactant may be added to the mixture of the organic material powder and the water-soluble polymer material powder in order to improve granulation properties and spreadability of the obtained granules. it can.

It is needless to say that the thus-formed agricultural water-floating granular carriers can be made to adsorb and hold an active ingredient of a pesticide or a fertilizer on the granular carriers after being formed in such a granular form. Instead of the above, the active ingredient of the pesticide or fertilizer, before granulating the granular carrier, in advance,
The organic material powder and the water-soluble polymer material powder are added to both or one of them by adsorption, kneading, or the like, and the organic material powder and the water-soluble polymer material powder are mixed and granulated to form a water-suspendable granular carrier for agricultural use. Rather, it may be configured directly as agricultural water-floating granules.

Therefore, according to the water-suspendable granular carrier for agricultural use of the present invention, the desired active ingredient of a pesticide or fertilizer is retained and then thrown into the water of a paddy field or the like by hand or appropriate mechanical means. , The granular carrier floats for a while,
Widely spreads on the water surface due to wind force and water flow, and then disperses and dissolves in water. Thus, the active ingredient of the pesticide or fertilizer held in the granular carrier is widely and uniformly dispersed without being unevenly distributed in the water of the paddy field. Further, according to the granular carrier, there is no risk of harming human health as described above, and it is also effective in that respect.

By the way, the water-floating agricultural particulate carrier of the present invention described above can be manufactured by various manufacturing methods. For example, in a process of mixing the organic material powder and the water-soluble polymer material powder, kneading with water, wet-press molding, drying the obtained molded product, and cutting and crushing to an appropriate size. It can be manufactured, or, for example, after mixing the organic material powder and the water-soluble polymer material powder and kneading with water, a molded product obtained by wet pressure molding is cut into an appropriate size. It is also possible to manufacture by a process of crushing and drying.

In any of the processes, when kneading with water using a mixed powder of an organic material powder and a water-soluble polymer material powder, the water-soluble polymer material powder was previously dissolved without using water alone. It may be used in the form of an aqueous solution. Further, it is also possible to manufacture by a procedure other than the above process.

In the above-described production process, as a means for mixing the organic material powder and the water-soluble polymer material powder, a ribbon mixer, a Nauter mixer, a Henschel mixer, a Spartan mixer, and the like can be mentioned. Examples of the water-kneading means include a ribbon mixer, a Nauter mixer, a Henschel mixer, a Spartan Luiser, and a kneader. As the wet pressure molding means, a roll-type pressure molding machine, a piston-type pressure molding machine, a screw-type pressure molding machine, a perforated plate extrusion molding machine (disk pelleter), or the like can be used. Examples of the drying means include a vibration fluidized dryer and a rotary dryer.

The shape of the wet-pressed product formed by the wet-pressing means may be any shape, for example, various shapes such as a rod, a sphere, a cylinder, a plate, a rectangular parallelepiped, and a cone. The size of these molded products is 0.1 to 10 mm, preferably 0.2 to 5 mm.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below in detail based on four examples. Example 1 90 parts by weight of wood powder (particle size: 100 mesh) obtained by pulverizing sawdust, 10 parts by weight of methylcellulose powder were mixed well, 120 parts by weight of water was added and kneaded, and a granule of 1.2 mm was formed by a granulator. The mixture was granulated and dried in a box drier to obtain a granular material of 6 to 32 mesh.

Example 2 90 parts by weight of wood powder obtained by pulverizing sawdust, 10 parts by weight of methylcellulose powder were mixed well, 120 parts by weight of water was added and kneaded, and granules of 3.0 mm were granulated by a granulator. And dried with a box drier to obtain 4-32 mesh granules.

Example 3 90 parts by weight of crushed sawdust was mixed well with 10 parts by weight of xanthan gum powder, 120 parts by weight of water was added and kneaded, and a granule of 1.2 mm was granulated by a granulator. And dried with a box drier to obtain a granular material of 6 to 32 mesh.

Example 4 Powder 9 having a particle size of 60 mesh obtained by crushing Japanese peach with a crusher
0 parts by weight, 10 parts by weight of methylcellulose powder are mixed well, 100 parts by weight of water is added, and the mixture is kneaded.
Was granulated and dried with a box drier to obtain 6-32 mesh granules.

Comparative Example 1 97 parts by weight of potassium chloride powder were uniformly mixed with 3 parts by weight of xanthan gum, 10 parts by weight of water were added and kneaded, and the obtained kneaded product was extruded through a 1.2 mm diameter screen extrusion granulator. After drying, a granular material having 6 to 32 mesh was obtained.

Comparative Example 2 30 parts by weight of cork powder (0.25 mm or less) and 70 parts by weight of bentonite powder were mixed, and 110 parts by weight of water were added and kneaded. The obtained kneaded product was screened with a screen having a diameter of 1.2 mm. After extrusion granulation with an extrusion granulator, the mixture is dried and then 0.3 to 1.7.
mm granules were obtained.

The comparative example 1 is described in JP-B-63-30281.
Comparative Example 2 was carried out without adding an active ingredient of a pesticide under the same conditions as in Examples 1 to 4 based on the technology disclosed in JP-A-6-336403. In order to obtain the same conditions as in Examples 1 to 4 based on the present technique, the experiment was carried out without adding an active ingredient of a pesticide.

Next, the results of tests performed on the granular materials obtained in Examples 1 to 4 and the granular materials obtained in Comparative Examples 1 and 2 by the following test methods will be compared. Test Method Apparent Specific Gravity Measurement Method A pre-measured cylindrical container having a diameter of 5 cm, a height of 5 cm and a content of 100 ml is placed, and a standard sieve (aperture 2.5 mm) is placed at a height of 20 cm. Place the sample on the above standard sieve, agitate it with a brush and drop it into the cylindrical container.When the falling object of the sample rises from the opening of the container, it is the position of the edge of the container. And the weight of each container was measured. The weight of the container was subtracted from the measured weight value, and the obtained value was divided by 100 to obtain a value obtained as apparent specific gravity. That is, apparent specific gravity = content weight (g) / 100 (ml) method of measuring buoyancy Water was placed in a plastic container having a diameter of 30 cm and a height of 15 cm until the 8th minute, and a sample (particulate matter of each Example and Comparative Example) was added. ) 1g
To the center of the water surface. The state of the sample after dropping on the water surface, that is, the ratio of particles sinking in water and particles floating on the water surface was observed.

[0024]

[Table 1]

The test results of Examples 1 to 4 and Comparative Examples 1 and 2 are shown in Table 1. As shown in Table 1, all of the granular materials of Examples 1 to 4 are floating on the water surface while maintaining their shapes for 30 minutes or more, whereas the granular materials of Comparative Example 1 are 80% or more in 30 minutes. Sunk, and the granular material of Comparative Example 2 sank immediately, and after several minutes, it floated.
After the elapse of minutes, 50% has melted and does not maintain its shape. Further, in Examples 1 to 4, even in Example 4 in which the sinking is the fastest, 50% or more floats after 60 minutes. In Examples 1 and 3, it is about 90% or 80% floating. Therefore, when applied to paddy fields, etc., it is long floating on the water surface, is widely dispersed by natural winds and pristine flows, and the active ingredients of pesticides and fertilizers retained there can be widely and uniformly applied in paddy fields. It becomes.

[0026]

Thus, according to the water-suspendable granular carrier for agricultural use of the present invention, the desired active ingredient of a pesticide or fertilizer can be retained, and then the water can be manually or suitably mechanically applied to the water of a paddy field or the like. When thrown, the granular carrier floats for a while, spreads widely on the water surface due to wind force, water flow, and the like, and then disperses and dissolves in water. Thus, the active ingredient of the pesticide or fertilizer held in the granular carrier is widely and uniformly dispersed without being unevenly distributed in the water of the paddy field. Further, according to the granular carrier, there is no risk of harming human health as described above, and it is also effective in that respect.

The use of wood flour as the organic material powder has the advantage that it has a sufficient function of retaining the active ingredients of agricultural chemicals or fertilizers, and that it is continuously available at low cost. It decomposes in nature after use and does not harm the environment.

When the size of the organic material powder is 500 μm or less, particularly 200 μm or less, there is an advantage that good granulation can be performed. This is the same in the case of the water-soluble polymer material powder.

When a water-soluble natural polymer material powder is used as the water-soluble polymer material powder, an advantage of being decomposed in the natural world and causing no harm can be obtained. Further, when methyl cellulose is adopted as the water-soluble polymer material powder,
The granular carrier, which is a granulated product with the organic material powder, can be easily absorbed during storage and has little change with time.
Of course, methylcellulose itself has the advantage of decomposing in the natural world and not causing harm to the environment.

When the weight ratio between the organic material powder and the water-soluble polymer material is in the range of 99: 1 to 60:40, an appropriate buoyancy can be obtained for the obtained granular material. When this is set between 97: 3 and 80:20, more favorable buoyancy can be obtained.

When the granular material as the granular carrier is configured to be able to float on the water surface for 10 minutes or more while maintaining its shape in the form of granules, the granular carrier holding the active ingredient of a pesticide or fertilizer is placed in a paddy field. When thrown onto the surface of the water, the granular carriers can spread to a sufficiently wide range due to the influence of wind in the natural state and the like. Thus, the active ingredient of the pesticide or the fertilizer can be uniformly applied over a wide range.

The water-suspendable granular carrier for agriculture according to the present invention comprises an organic material powder and a water-soluble polymer material powder, and can be constituted by using peach, wood flour and other waste materials. have.

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[Procedure amendment]

[Submission date] March 6, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Waterborne floating granular carrier for agriculture

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a water-floating, agricultural water-dispersible granular material which is used to hold a pesticide or fertilizer in a paddy field, etc., and to efficiently and uniformly diffuse the active ingredient of the pesticide or fertilizer into water. Carrier.

[0002]

2. Description of the Related Art Conventional agricultural chemicals for paddy fields are formulated into dusts, wettable powders, emulsions or granules, and applied to the water surface or rice body. The above-mentioned powders and wettable powders have health and environmental problems for the user due to dusting, and in the case of the emulsion, the health and the flammability of the user due to the toxicity of the organic solvent are high. There is a fire problem due to. On the other hand, granules do not have the above-mentioned problems, but conventional ones, when they are sprayed on the water surface in paddy fields without using any special equipment, the diffusion of the active ingredient, etc. However, there is a problem that it is not always performed properly, and uneven distribution is likely to occur.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and is particularly effective in improving the health of users and the like.
The active ingredient of pesticides or fertilizers that are efficiently expanded to the required area of paddy fields and retained by taking advantage of and improving the advantages of granules that have no problems such as environmental and fire risks It is an object of the present invention to provide an agricultural water-floating granular carrier capable of dispersing water uniformly throughout.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention is an agriculturally water-suspendable granular carrier formed by granulating a mixture of an organic material powder and a water-soluble polymer material powder into porous granules.

[0005] As the organic material powder, for example, grass, firgrass, peanut shell, peat moss, wood flour and the like can be used. These can be used as a single powder or a mixed powder of two or more. All of these have a sufficient function of retaining the active ingredient of pesticides or fertilizers, and there is no significant difference in that respect, but wood flour is suitable in the sense that it is continuously available at a low cost. It is. The size of these organic material powders is 500 μm from the viewpoint of granulation.
m or less, particularly preferably 200 μm or less.

Examples of the water-soluble polymer powder include starch, carboxymethylcellulose, methylcellulose, ethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, sodium alginate, guar gum, xanthan gum, bean gum, carrageenan, gluten and the like. Among them, starch,
Natural polymer powders such as carboxymethylcellulose, methylcellulose, ethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, guar gum and gluten are preferred in that they can be decomposed in nature. These water-soluble polymer material powders can be used as a single powder or a mixed powder of two or more. Of the above, methyl cellulose is more preferred. This is because the granular carrier, which is a granulated product with the organic material powder, does not easily absorb moisture during storage and has little change with time. The size of these water-soluble polymer powders is preferably 500 μm or less, more preferably 200 μm or less from the viewpoint of granulation.

[0007] The weight ratio of the organic material powder and the water-soluble polymer material powder varies depending on the type, but is generally in the range of 99: 1 to 60:40.
Preferably, it is between 97: 3 and 80:20. If the amount of the water-soluble polymer material powder is less than 1%, the granular carrier, which is a granulated product of both powders, has insufficient buoyancy, and even if it is used in excess of 40%, the buoyancy does not improve so much. This is not desirable from an appropriate viewpoint. The reason for the change in the buoyancy of the granulated material depending on the ratio of the water-soluble polymer material powder is not always clear, but it is thought that if the ratio is too small, the obtained granular material will not easily become porous. Can be

[0008] By the way, it is appropriate that the granular material as the granular carrier is configured to be able to float on the water surface for 10 minutes or more while keeping its shape in a granular state. That is, when a granular carrier holding an active ingredient of a pesticide or a fertilizer is thrown onto a water surface in a paddy field, the granular carrier spreads to a sufficiently wide range due to the influence of wind in a natural state and the like. Because that much time is needed. Such particulate matter that can be suspended on the water surface for 10 minutes or more can be obtained by appropriately selecting the ratio of the organic material powder and the water-soluble polymer material powder, their types, and the granulation method. Naturally, apparent specific gravity is also an important factor.

[0009] If necessary, a surfactant may be added to the mixture of the organic material powder and the water-soluble polymer material powder in order to improve granulation properties and spreadability of the obtained granules. it can.

It is needless to say that the thus-formed agricultural water-floating granular carriers can be made to adsorb and hold an active ingredient of a pesticide or a fertilizer on the granular carriers after being formed in such a granular form. Instead of the above, the active ingredient of the pesticide or fertilizer, before granulating the granular carrier, in advance,
The organic material powder and the water-soluble polymer material powder are added to both or one of them by adsorption, kneading, or the like, and the organic material powder and the water-soluble polymer material powder are mixed and granulated to form a water-suspendable granular carrier for agricultural use. Rather, it may be configured directly as agricultural water-floating granules.

Therefore, according to the water-suspendable granular carrier for agricultural use of the present invention, the desired active ingredient of a pesticide or fertilizer is retained and then thrown into the water of a paddy field or the like by hand or appropriate mechanical means. , The granular carrier floats for a while,
Widely spreads on the water surface due to wind force and water flow, and then disperses and dissolves in water. Thus, the active ingredient of the pesticide or fertilizer held in the granular carrier is widely and uniformly dispersed without being unevenly distributed in the water of the paddy field. Further, according to the granular carrier, there is no risk of harming human health as described above, and it is also effective in that respect.

By the way, the water-floating agricultural particulate carrier of the present invention described above can be manufactured by various manufacturing methods. For example, in a process of mixing the organic material powder and the water-soluble polymer material powder, kneading with water, wet-press molding, drying the obtained molded product, and cutting and crushing to an appropriate size. It can be manufactured, or, for example, after mixing the organic material powder and the water-soluble polymer material powder and kneading with water, a molded product obtained by wet pressure molding is cut into an appropriate size. It is also possible to manufacture by a process of crushing and drying.

In any of the processes, when kneading with water using a mixed powder of an organic material powder and a water-soluble polymer material powder, the water-soluble polymer material powder was previously dissolved without using water alone. It may be used in the form of an aqueous solution. Further, it is also possible to manufacture by a procedure other than the above process.

In the above-described production process, as a means for mixing the organic material powder and the water-soluble polymer material powder, a ribbon mixer, a Nauter mixer, a Henschel mixer, a Spartan mixer, and the like can be mentioned. Examples of the water-kneading means include a ribbon mixer, a Nauter mixer, a Henschel mixer, a Spartan Luiser, and a kneader. As the wet pressure molding means, a roll-type pressure molding machine, a piston-type pressure molding machine, a screw-type pressure molding machine, a perforated plate extrusion molding machine (disk pelleter), or the like can be used. Examples of the drying means include a vibration fluidized dryer and a rotary dryer.

The shape of the wet-pressed product formed by the wet-pressing means may be any shape, for example, various shapes such as a rod, a sphere, a cylinder, a plate, a rectangular parallelepiped, and a cone. The size of these molded products is 0.1 to 10 mm, preferably 0.2 to 5 mm.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below in detail based on four examples. Example 1 90 parts by weight of wood powder (particle size: 100 mesh) obtained by pulverizing sawdust, 10 parts by weight of methylcellulose powder were mixed well, 120 parts by weight of water was added and kneaded, and a granule of 1.2 mm was formed by a granulator. The mixture was granulated and dried in a box drier to obtain a granular material of 6 to 32 mesh.

Example 2 90 parts by weight of wood powder obtained by pulverizing sawdust, 10 parts by weight of methylcellulose powder were mixed well, 120 parts by weight of water was added and kneaded, and granules of 3.0 mm were granulated by a granulator. And dried with a box drier to obtain 4-32 mesh granules.

Example 3 90 parts by weight of crushed sawdust was mixed well with 10 parts by weight of xanthan gum powder, 120 parts by weight of water was added and kneaded, and a granule of 1.2 mm was granulated by a granulator. And dried with a box drier to obtain a granular material of 6 to 32 mesh.

Example 4 Powder 9 having a particle size of 60 mesh obtained by crushing Japanese peach with a crusher
0 parts by weight, 10 parts by weight of methylcellulose powder are mixed well, 100 parts by weight of water is added, and the mixture is kneaded.
Was granulated and dried with a box drier to obtain 6-32 mesh granules.

Comparative Example 1 97 parts by weight of potassium chloride powder were uniformly mixed with 3 parts by weight of xanthan gum, 10 parts by weight of water were added and kneaded, and the obtained kneaded product was extruded through a 1.2 mm diameter screen extrusion granulator. After drying, a granular material having 6 to 32 mesh was obtained.

Comparative Example 2 30 parts by weight of cork powder (0.25 mm or less) and 70 parts by weight of bentonite powder were mixed, and 110 parts by weight of water were added and kneaded. The obtained kneaded product was screened with a screen having a diameter of 1.2 mm. After extrusion granulation with an extrusion granulator, the mixture is dried and then 0.3 to 1.7.
mm granules were obtained.

The comparative example 1 is described in JP-B-63-30281.
Comparative Example 2 was carried out without adding an active ingredient of a pesticide under the same conditions as in Examples 1 to 4 based on the technology disclosed in JP-A-6-336403. In order to obtain the same conditions as in Examples 1 to 4 based on the present technique, the experiment was carried out without adding an active ingredient of a pesticide.

Next, the results of tests performed on the granular materials obtained in Examples 1 to 4 and the granular materials obtained in Comparative Examples 1 and 2 by the following test methods will be compared. Test Method Apparent Specific Gravity Measurement Method A pre-measured cylindrical container having a diameter of 5 cm, a height of 5 cm and a content of 100 ml is placed, and a standard sieve (aperture 2.5 mm) is placed at a height of 20 cm. Place the sample on the above standard sieve, agitate it with a brush and drop it into the cylindrical container.When the falling object of the sample rises from the opening of the container, it is the position of the edge of the container. And the weight of each container was measured. The weight of the container was subtracted from the measured weight value, and the obtained value was divided by 100 to obtain a value obtained as apparent specific gravity. That is, apparent specific gravity = content weight (g) / 100 (ml) method of measuring buoyancy Water was placed in a plastic container having a diameter of 30 cm and a height of 15 cm until the 8th minute, and a sample (particulate matter of each Example and Comparative Example) was added. ) 1g
To the center of the water surface. The state of the sample after dropping on the water surface, that is, the ratio of particles sinking in water and particles floating on the water surface was observed.

[0024]

[Table 1]

The test results of Examples 1 to 4 and Comparative Examples 1 and 2 are shown in Table 1. As shown in Table 1, all of the granular materials of Examples 1 to 4 are floating on the water surface while maintaining their shapes for 30 minutes or more, whereas the granular materials of Comparative Example 1 are 80% or more in 30 minutes. Sunk, and the granular material of Comparative Example 2 sank immediately, and after several minutes, it floated.
After the elapse of minutes, 50% has melted and does not maintain its shape. Further, in Examples 1 to 4, even in Example 4 in which the sinking is the fastest, 50% or more floats after 60 minutes. In Examples 1 and 3, it is about 90% or 80% floating. Therefore, when applied to paddy fields, etc., it is long floating on the water surface, is widely dispersed by natural winds and pristine flows, and the active ingredients of pesticides and fertilizers retained there can be widely and uniformly applied in paddy fields. It becomes.

[0026]

Thus, according to the water-suspendable granular carrier for agricultural use of the present invention, the desired active ingredient of a pesticide or fertilizer can be retained, and then the water can be manually or suitably mechanically applied to the water of a paddy field or the like. When thrown, the granular carrier floats for a while, spreads widely on the water surface due to wind force, water flow, and the like, and then disperses and dissolves in water. Thus, the active ingredient of the pesticide or fertilizer held in the granular carrier is widely and uniformly dispersed without being unevenly distributed in the water of the paddy field. Further, according to the granular carrier, there is no risk of harming human health as described above, and it is also effective in that respect.

The use of wood flour as the organic material powder has the advantage that it has a sufficient function of retaining the active ingredients of agricultural chemicals or fertilizers, and that it is continuously available at low cost. It decomposes in nature after use and does not harm the environment.

When the size of the organic material powder is 500 μm or less, particularly 200 μm or less, there is an advantage that good granulation can be performed. This is the same in the case of the water-soluble polymer material powder.

When a water-soluble natural polymer material powder is used as the water-soluble polymer material powder, an advantage of being decomposed in the natural world and causing no harm can be obtained. Further, when methyl cellulose is adopted as the water-soluble polymer material powder,
The granular carrier, which is a granulated product with the organic material powder, can be easily absorbed during storage and has little change with time.
Of course, methylcellulose itself has the advantage of decomposing in the natural world and not causing harm to the environment.

When the weight ratio between the organic material powder and the water-soluble polymer material is in the range of 99: 1 to 60:40, an appropriate buoyancy can be obtained for the obtained granular material. When this is set between 97: 3 and 80:20, more favorable buoyancy can be obtained.

When the granular material as the granular carrier is configured to be able to float on the water surface for 10 minutes or more while maintaining its shape in the form of granules, the granular carrier holding the active ingredient of a pesticide or fertilizer is placed in a paddy field. When thrown onto the surface of the water, the granular carriers can spread to a sufficiently wide range due to the influence of wind in the natural state and the like. Thus, the active ingredient of the pesticide or the fertilizer can be uniformly applied over a wide range.

The water-suspendable granular carrier for agriculture according to the present invention comprises an organic material powder and a water-soluble polymer material powder, and can be constituted by using peach, wood flour and other waste materials. have.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI C05G 3/00 101 C05G 3/00 101

Claims (7)

[Claims] 1. A water-suspendable granular carrier for agricultural use which is formed by granulating a mixture of an organic material powder and a water-soluble polymer material powder into porous granules. 2. The agricultural water-surface-floating particulate carrier according to claim 1, wherein the granular substance is allowed to float on the water surface for 10 minutes or more while keeping its shape in a granular state. 3. The agricultural water-suspendable granular carrier according to claim 1, wherein the ratio of the organic material powder and the water-soluble polymer material powder is in the range of 99: 1 to 60:40. 4. The organic material powder having a particle size of 200 μm.
2. The agriculturally water-suspendable granular carrier according to claim 1, wherein the carrier has a particle size of not more than m. 5. The water-soluble polymer material powder having a particle size of 2
The agriculturally water-suspendable granular carrier according to claim 1, wherein the granular carrier has a size of 00 µm or less. 6. The water-suspendable granular carrier for agricultural use according to claim 1, wherein wood powder is employed as the organic material powder. 7. The agricultural water-floating particulate carrier according to claim 1, wherein a natural polymer powder is employed as the water-soluble polymer powder.