JPS60226801A - Granules of agricultural chemical of sustained release - Google Patents

Abstract

PURPOSE:The titled agricultural chemical that has improved coating uneveness and sustained release effect by using a combination of an isocyanate with fluid paraffin as a coating layer, when a granular composition containing agriculturally active ingredients and a carrier is coated with a layer to form a sustained release preparation. CONSTITUTION:Granules of a composition consisting of (A) active ingredients for agricultural purposes and (B) a carrier are coated with a coating layer composed of (C) an isocyanate, preferably polyisocyanate and (D) a fluid paraffin, preferably, further coated, as an outermost layer, with (E) an organic and/or inorganic powder to prevent uneven coating and pin hole formation to show better sustained release by small amounts of coating than in case of single coating component. The amounts of these components are as follows: A=0.05-30wt%, C, D= 1.0-20.0wt%, respectively; C:D=1:10-10:1, E=3.0-30.0wt%.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application] The present invention relates to granular agricultural chemicals, and more specifically VC relates to sustained release granular agricultural chemicals.

[Prior art]

In recent years, several attempts have been made to achieve sustained release of active ingredients for the purpose of saving labor in agriculture, preventing chemical damage, and preventing environmental pollution caused by agricultural chemicals.

There are various VC production technologies for sustained-release pesticides that have been proposed in the past, but they can be roughly divided into: (1) mixing room-temperature-reactive curing resin and pesticide together for elution and sustained release (Unexamined Japanese Patent Application Showa 4
(Refer to Japanese Patent Application Laid-open No. 8-5940♀), (Micro-encapsulation of 21m drug (Refer to Japanese Patent Application Laid-open No. 48-4643)
,+31 After covering the granular agricultural chemicals with synthetic resin, coat them with fine powder gold powder to prevent block formation (Special Publication No. 41-19080)
(41 Containing a lipophilic base that is solid at room temperature (see Japanese Patent Application Laid-open No. 55-4356), (5)
Carrying an active ingredient on a suction agent (Japanese Patent Application Laid-Open No. 56-156)
(Refer to Publication No. 201) and so on.

However, all of these sustained-release pesticides have many drawbacks. In other words, in either case, the effect of sustained release is insufficient, and the objectives of sustained release, such as prolonging residual efficacy, preventing environmental pollution, and reducing drug damage, cannot be fully achieved. Each additive (synthetic resin, lipophilic base, adsorbent, etc.) requires a large amount of gold, and is not necessarily practical from an industrial or economic standpoint.

For example, when using a synthetic resin as in (3+) or a solid lipophilic base as in (4), a fairly large amount of resin or lipophilic base is required to completely control bathing. Even if it is possible to suppress the elution by using a large amount, it is extremely difficult to freely control the elution.Furthermore, if the uniformity of the additive is lacking on the surface of these fully treated granular pesticides, it will be difficult to control the elution. It has low industrial utility value as holes are generated and the balance of elution control is disrupted.For f21K, in order to make microcapsules A, a large amount of equipment and manufacturing process costs are required, and it is not practical. (5) For K, in order to adsorb the active ingredients, it is necessary to use a large amount of adsorbent, or to use gold as an adsorbent with a large adsorption power. As a result, it is often impossible to completely release the active ingredient in water, which is uneconomical.

In view of the above-mentioned current situation, the present inventors have conducted intensive research to develop a formulation technology that is practical from both industrial and economical points of view and has sufficient sustained-release properties, and as a result, they have completed the present invention. It's arrived.

[Purpose of the invention]

An object of the present invention is to provide a new sustained-release granular pesticide that overcomes the drawbacks of the prior art described above.

[Structure of the invention]

To summarize the present invention, the sustained-release granular agricultural chemical of the present invention is characterized in that a granular composition containing all of an agricultural chemical active ingredient and a carrier is provided with a coating layer comprising an incyanate compound and liquid paraffin. Further, the sustained-release granular pesticide of the present invention includes a granular composition containing an agricultural active ingredient and a carrier, which is provided with a support layer consisting of an incyanate compound and liquid paraffin ↓υ, and is further coated with an organic powder and/or an inorganic powder as an outer layer. It is characterized by having an a-layer.

In the present invention, the granular composition containing all of the agricultural chemical active ingredient and carrier is provided with the coating 1- to control the release of the active ingredient from the carrier in the granular composition, and the outer layer of the coating layer is It has been found that providing a coating layer of organic powder and/or inorganic powder can promote this process. Although it is difficult to explain the effects of the 51m incyanate compound and liquid paraffin in terms of metal parts, it has been experimentally confirmed that the effects of the present invention can only be achieved by using both in combination. .

Next, the iso7anate compound, liquid paraffin, organic powder or inorganic powder, and agricultural active ingredient used in the present invention will be explained.

Although any inocyanate compound can be used as the isocyanate compound in the present invention, inocyanate compounds having a large number of isocyanate groups are particularly effective. As illustrated below, these compounds may be used alone or in combination.
Used as a mixture of more than one species.

Aliphatic diisocyanates such as hexamethylene diisocyanate; m-phenylene diisocyanate, p-phenylene diisocyanate, tolylene-2,6-diisocyanate, tolylene-2,4-diisocyanate, diphenylmethane-4,a'-diisocyanate, chlorphenylene-2 , 4-diisocyanate, naphthalene-
1,5-diisocyanate, diphenyl-4,4'-diisocyanate, 4,4'-diincyanato-5,5'
- aromatic diincyanates such as dimethyl-diphenyl, 5-methyl-diphenylmethane-4,4'-diisocyanate and diphenyl ether diisocyanate; 1-methylcyclohexyl-2,4-diisocyanate, 1-methylcyclohexyl-2,6-diisocyanate, Alicyclic diisocyanates such as bis(incyanatocyclohexyl)-methane; triisocyanates such as 2,4.6-triinocyanatotoluene, 2,4.4'-)diynecyanatodiphenyl ether; Methylene-crosslinked polyphenylene polyisocyanate L9 produced by phosgenating a corresponding mixture of polyamino obtained by condensation of aniline (n ff O or an integer greater than or equal to 1) with formaldehyde.

The in/anate compounds in the present invention are not limited to the above compounds, but are preferably crude mixtures of methylene-crosslinked polyphenylene polyisocyanates containing aromatic isocyanates, especially diisocyanates, triisocyanates, and polyisocyanates with higher functionality.

The liquid paraffin used in the present invention is a saturated hydrocarbon that is obtained from petroleum and is liquid at room temperature, and is generally commercially available as a mixture with a carbon content of B2o or less.

Examples of organic powders or inorganic powders in the present invention include fine mineral powders such as clay, talc, diatomaceous earth, and bentonite, salts such as calcium carbonate, magnesium carbonate, and sodium chloride, white carbons, starch, and cellulite.
Examples include fine powders of natural polymers such as polyvinyl alcohol, synthetic or semi-synthetic polymers such as carboxymethylcellulose, etc. Sometimes powder is sufficient.

The active ingredient for agricultural chemicals in the present invention is not particularly limited, but a typical example is 5-methyl-1,2,4-triazolo(5,4-b)-benzothiazole (tricyclazolone, 1.2.5 .6-tetrahydro-4H-pyrrolo(5,2,1-t, + 3 quinolin-4-one(
pyroquilone), diisopropyl-1,5-dithiolane-
2-ylidene-malonate (isobrothiolane), 5-
Allyloxy-1,2-benziisothiazole-1,1
-dioxide (globenazole), 2,3-dihydro-
2,2-dimethylbenzofuran-7-yl-N-methylcarbamate (carbofuran), 2,5-dihydro-2
, 2-dimethylbenzofuran-7-yl (dibutylaminothio)-N-methylcarbamate (carbosulfan), 2,2-dimethyl-1,5-benzodioxy-4
-Ilu N-Methyl τ Bamate (Pendiocarb)
, 0,0-5, 5.6-)dichloro-2-pyridyl-o,o-dimethylphosphorothioate (chlorpyrifosmethyl), 2-chloro-1-(2,4-dichlorophenylonvinyldimethylphosphate (dimethylvinyl) Hoss)
, 0,0-dimethyl-0-[3-methyl-4-(methylthio)phenylcothiophosphate (MPF), 1.
'5-Bis(carbamoylthio)-2,-(N,N-dimethylamino)prop7tMrRtiA (Cartap), 2,4-bis(ethylamino)-6-methylthio-
1,5,5-triazine (cymetri 7), s-ethylhexahydro-1H-azepine-1-carbothioate (
Molinet 1,2-chloro-2!6'-diethyl-H-(
butoxymethyl)acetanilide (butachlor), 2
-(β-naphthyloxy)globionanilide (naph”
roanilide), 4-(2,4-dichlorobenzoyl)-
1,5-dimethyl-5-+, ;W+r l 11--
W -L n--ry Fu n no 7 + h ty
``Lyv-t λ, 5-p-chlorobenzyl diethyl thiocarbamate (benthiocarb), and these active ingredients may be used alone or in combination of two or more.

As the carrier to be mixed with the active ingredient, external adsorption carriers such as mineral fine powder, such as clay, talc, diatomaceous earth, and bentonite, which are used as carriers for general granular agricultural chemicals, are used.

The blending ratio of the active ingredient and the carrier is not particularly limited, but is determined by the amount of the active ingredient used as the sustained-release granular pesticide. The amount of active ingredient is α based on the weight of the sustained release granular pesticide.
05 to 30% by weight, preferably 11 to 20% by weight.

The ratio of the incyanate compound forming the coated layer to the liquid paraffin is preferably 1j1:10 to 10:1 [1:
The ratio is 5 to 5:1. Based on the weight of the sustained-release granular pesticide, the amount of the in7anate compound and liquid paraffin used is 1.0 to 1% by weight, preferably 2.0 to 1% by weight.

The amount of organic powder or inorganic powder used as the outer layer is 50 to 3
α011LiiL temperature, preferably 50 to 20.0
Weight%.

The usage amounts of each of the above-mentioned materials do not refer to the exact composition ratio for one grain of sustained-release granular agricultural chemicals, but mean the entire usage ratio of each material at the time of its preparation.

The amount and proportion of each component to be used can be adjusted depending on the desired degree of sustained release of the agrochemical active ingredient, thereby making it possible to freely control the dissolution of the active ingredient.

In addition to the above-mentioned components, the sustained-release granular pesticide of the present invention has a physical property improver, a stabilizing agent, a coloring agent, and a surfactant ν adjuvant in the granular composition and the outer layer. Agricultural active ingredients may be added to the controlled-release formulation.

The following method can be adopted as a method for producing the sustained-release granular pesticide of the present invention. First, the following five methods can be used to obtain a granular composition containing an agricultural chemical active ingredient and a carrier, but the method is not limited thereto.

(11) A granular composition is obtained by mixing the active ingredient for agricultural chemicals, the binder, and the fine carrier powder, pulverizing, and then kneading and granulating.

(2) A granular composition is obtained by adsorbing a liquid agricultural chemical or a solution of solid agricultural chemicals in a non-volatile solvent onto an oil-absorbing granular carrier or a granular carrier obtained by kneading and granulation.

(3) coating a granular carrier or a granular carrier obtained by kneading and granulation with an agricultural chemical active ingredient via a binder;
There are methods such as obtaining a granular composition.

To the granular composition containing all the active ingredients obtained by these methods, the incyanate compound and the liquid paraffin gold are added side by side, or the two are mixed and added simultaneously for coating.

The material is coated with organic or inorganic powder.

By uniformly coating these with VC, the sustained release granular pesticide of the present invention can be obtained.

[Embodiments of the invention]

The present invention will be explained in more detail with reference to Examples, Reference Examples, and Test Examples. “Part” in the following examples and reference examples
All ``chi'' indicates ``parts by weight'' or ``% by weight.''

Example 1 After adding and mixing 30 parts of polyvinyl alcohol and 925 parts of clay to 45s of tridiclazole, an appropriate amount of water is added and kneaded. This is granulated using a granulator with a screen having a hole diameter of 8 m.

After drying and sizing the granules to obtain a tridiclazole kneading base, 900 parts of this tridiclazole kneading base was mixed with cutrylene-2,4- and -2,6-diisocyanate. (ratio 8:2) and then uniformly coated with 50 parts of liquid paraffin to obtain granules containing 4 parts of tridiclazole.

Example 2 50 parts of polyvinyl alcohol and 921 parts of clay were added to 49 parts of tridiclazole to obtain a tridiclazole kneading base according to the method of Example 1.

Next, take 800 parts of this tridiclazole kneading base,
50 parts of the following crude mixture of methylene-crosslinked polyphenylene polyisocyanate and 50 parts of liquid paraffin were added at the same time, and after uniformly coating, 100 parts of diatomaceous earth was added as an outer layer.
20% to uniformly coat the mixture to obtain granules containing 4% of tridiclazole.

Methylene cross-linked polyphenylene polyisocyanate (the position of the methylene group is 0- with respect to the incyanato group)
, m-, p-position) Example 3 Granular calcium carbonate 7 with 16 mesh and 32 mesh
75 parts of pyroquilone are mixed and coated with 25 parts of polyethylene glycol (molecular weight: about 400) to obtain a granular composition containing pyroquilone.

Next 2.4. S-) Add 30 parts of gold to 1 flask of reinforcing resin, and after coating, add 50 parts of liquid paraffin to coat the mixture uniformly. Furthermore, 90 parts of talc is coated as an outer layer to obtain granules containing 75% of pyrochloride.

Example 4 75 parts of carbosulfan and 20 parts of polyvinyl alcohol
100 parts of bentonite and 5 parts of clay 806 were added to obtain a kneading base containing carbosulfan according to the method of Example 1.

Next, 680 parts of this carbosulfan kneading base was coated with 60 parts of liquid paraffin, and then 60 parts of diphenylene-4.4'-diincyanate (e) was uniformly coated. Furthermore, 200 parts of clay was evenly coated as an outer layer, and 5 parts of carbosulfan
Granules containing % total are obtained.

Example 5 900 parts of the tridiclazole kneading base obtained in Example 1 was taken, and 40 parts of the mixture (1:1) of diphenyl-4,4'-diisocyanate and liquid paraffin used in Example 4 was taken.
cover the area. Next, after uniformly damaging 10 parts of white carbon, propaphos (0,0-dipropyl-0-4-
50 parts of methylthiophenyl phosphate) are adsorbed,
Granules containing 4% tridiclazole and 5% propafos are obtained.

Example 6 10 parts of sodium carboxymethyl cellulose, 300 parts of bentonite, and 567 parts of talc were added to 55 parts of tridiclazole and 68 parts of carbosulfan to prepare a base for kneading tridiclazole and carbosulfan according to the method of Example 1. get money

Next, 750 parts of this kneading base was taken, and 80 parts of the crude mixture of methylene-crosslinked polyphenylene polyisocyanate used in Example 2 and 40 parts of liquid paraffin were simultaneously added and coated. Furthermore, granules 1r coated with 150 parts of calcium carbonate and containing 4% tridiclazole and 5% carbosulfan are obtained.

Example 7 10 parts of polyvinyl alcohol, 200 parts of bentonite, and 699 parts of clay were added to 91 parts of molinate to obtain a molinate kneading base according to the method of Example 1.

Molinate kneading base 880 parts gold and 9 parts, liquid paraffin 1 part
00 parts of tetramethylene pentaphenyl pentaisocyanate and 20 parts of tetramethylene pentaphenyl pentaisocyanate were coated uniformly with stirring to obtain granules containing 8% of molinate.

Example 8 100 parts of diatomaceous material, 300 parts of bentonite, and 600 parts of calcium carbonate were mixed and the granulation method of Example 1 was followed to obtain a granular empty base material containing no active ingredient. After taking 760 parts of this empty base and adsorbing 40 parts of butachlor,
Coated with 70 parts of liquid paraffin, then coated with diphenyl-4,
After coating with 30 parts of 4-diisocyanate, 100 parts of powdered starch was uniformly coated with VC4INfi to form butachlor 4-diisocyanate.
Obtain granules containing %.

Air ## Shelf 19 Take 840 parts of the empty base of Example 8, and completely adsorb 15 parts of Shift 9 to 70 parts of Benthiocarb.

These are coated with 45 parts of liquid paraffin. Next, 50 parts of tetramethylenepentaphenylpentaiso7anate are uniformly coated to obtain a granule containing 1.5% of cymetrine and 7% of penthiocarb.

Reference Example 1 After completely mixing 40 parts of tridiclazole and 600 parts of clay, this mixture was gradually added to a heating bath melt mixture of 210 parts of solid paraffin with a melting point of 58°C and 150 parts of stearic acid (melting point 58-59°C). Mix. These mixtures are 80%
After heating to a temperature of 0.degree. C. to form a suspension, the mixture is spray granulated using a spray granulator to obtain granules containing 4% tridiclazole.

Reference Example 2 Take 900 parts of the tridiclazole kneading base (containing 4.5% tridiclazole) obtained in Example 1, and add tolylene-2
, 4- and -2,6-diisocyanate mixture 100
The sample was uniformly coated to obtain granulated gold containing 4% of tridiclazole.

Reference Example 3 40 parts of tridiclazole was mixed with 500 parts of activated carbon, 309 parts of polyvinyl alcohol, and 630 parts of clay.
According to the granulation method, tridiclazole 4 is granulated and dried.
Obtain granules containing %.

Reference Example 4 Take 850 parts of the granular composition containing 5.9% of pyroquilone obtained in Example 6, coat it with 60 parts of liquid paraffin, and further coat it uniformly with 90 parts of talc to obtain a granule containing 5% of pyroquilone. get.

Reference Example 5 Take 680 parts of the carbosulfan kneading base obtained in Example 4, add a mixture of 240 parts of diphenyl-4,4'-diisocyanate and 20 parts of the following acrylic polyol, and uniformly coat the mixture. Granules containing 50% of carbosulfan are obtained.

Acrylic polyol general formula OH, == CH-0-0(CH,) n0O
OH1 (n=5 to 8) and OH.

A polymer compound of a compound represented by the Hibiki general formula OH,:0-0-0 (OH,)mOOOH1 (m=3-6) (average molecular weight 2000-46
00) Reference Example 6 A mixed solution of 900 parts of gold, 50 parts of 9 liquid paraffin, and 50 parts of propaphos was added to the tridiclazole kneading base obtained in Example 1, adsorbed and coated, and 4% of tridiclazole and 5 parts of propaphos were added. Granules containing % total are obtained.

Reference Example 7 730 parts of the tridiclazole and carbosulfan kneading base obtained in Example 6 were coated with 120 parts of the crude mixture of methylene-crosslinked polyphenylene polyisocyanate used in Example 2, and further 15 parts of calcium carbonate '0fR1
Uniformly coated to obtain granules containing 4% tridiclazole and 5% carbosulfur.

Reference Example 8 880 parts of the molinate kneading base obtained in Example 7 were taken, and 60 parts of liquid paraffin, 60 parts of an epoxy compound (GAN■: manufactured by Nippon Kayaku Co., Ltd.), and a polyamide compound (React 0A-101@: (manufactured by Sanyo Chemical Co., Ltd.) to obtain uniformly coated granules containing 8% molinet.

Reference Example 9 Take 760 parts of the empty base obtained in Example 8, and add 4 parts of butachlor.
0 parts, epoxy compound (GoTo: manufactured by Nippon Kayaku Co., Ltd.)
70 parts, polyamide curing agent (!J7ri) OA-101
@: Add 8 parts of the bath liquid to 30 parts (as described above) and allow it to be adsorbed onto the empty base. After uniform adsorption, 100 parts of powdered starch is coated to obtain granules containing 4% butachlor.

Reference Example 10 915 parts of the empty base obtained in Example 8 was taken and shifted to
1 part of Benthiocaraf is dissolved in VC and the solution is adsorbed onto the base to obtain granules containing 1.5% of Cymetrine and 7% of Penthiocarf.

The following tests were conducted on the granules prepared in Examples 1 to 9 and Reference Examples 1 to 10 described above.

Test Example 1 Water Bathability Test The dissolution properties of the components of each granule prepared in accordance with Examples and Reference Examples in water were tested. The test method is as follows.

Prepare a beaker and add 900 ml of 3 degree hard water into it.
and leave it in a constant temperature room at 20°C for one day. Granules 9 Omf, the component values of which have been measured in advance, are uniformly sprinkled into the beaker.

1, 10, 30, 60, and 100 days after spraying, water was sampled from the center of the beaker (depth 1 cm), and each component was analyzed using gas chromatography or high-performance liquid chromatography. Ta.

The bathing rate was determined by the following formula from the amount of each component eluted into water (μt) and the amount of each component contained in the sprayed granules (μf). The results are shown in Table 1.

The quantitative determination of each component was by gas chromatography for carfosulfan, glopaphosmolinate, butachlor, penthiocarb, and cymetrine, and by high performance liquid chromatography for tridiclazole, pyrokilo/△.Test Example 2
Blast disease control test example 1.2.3.5.6 and reference example 1.2.3.4.
All granules of No. 6.7 were used and the rice blast control effect and chemical damage were observed. .

The test method is shown below.

■ Seedling raising Rice seedlings at the 2nd and 5th leaf stage (variety: Aichi Asahi) grown in a seedling raising box (50x6Dx5:) were tested.

■ Chemical treatment The day before transplantation, each test granule of vl 00f was mixed in the seedling boxes and treated, and then watered at 50 rows per box.

■ One day after the rice cultivation chemical treatment, the rice was cut using a rice transplanter, and each plant with 5 stems was placed in a container (T8-36.54 x 36
Four plants were planted at 15 t:m). The planting density of 94 plants per container corresponds to approximately 20,000 plants (710 acre) planted in the field.

■ Testing the effect of controlling rice blast disease The container was transferred to a greenhouse bed where blast disease is actively occurring, and it was naturally infected.
On the day (leaf blast) and 100 days after transplantation (S blast), all K surveys were conducted to examine the control effect and chemical damage. However, the investigation of Kume blast is based on the Japanese Plant Prevention Prevention Survey Standards9.
The lesion area rate per plant was calculated.

Regarding the rice blast disease, the susceptibility index was calculated using the following formula.

Furthermore, drug damage was evaluated based on the following criteria.

-Two healthy leaves (no chemical damage) Approximately 20 to 30% of the twelve leaves are found to have chemical damage.

++ Drug damage was observed in about 30% or more of the two leaves.

The results are shown in Table 2.

Table 2 Test Examples Insecticidal residual effect test (residual effect test using rice weevil larvae) All insecticidal residual effect tests against rice weevil larvae were carried out using Example 4.6 and Reference Example 5.70 granules. did.

The test method is shown below.

Seedling raising and chemical treatment were carried out according to the method of Test Example 2. One day after chemical treatment, one plant with 5 stems? It was transplanted into a Wagner pot with a diameter of 1/5000 are. After transplanting, the pots were stored in a covered field at a water depth of f3tyn. For inoculation of larvae, adults were first laid eggs in a container in a greenhouse and reared while supplemented with rice. 1 each per pot
0 animals were released. The investigation was conducted by washing the rice roots with water one week after inoculating the larvae and checking the number of larvae. For example, the data on day 200 in Table 5 is the data obtained by inoculating larvae on the 200th day after treatment with the drug, and checking the number of larvae one week later.

Test Example 4 Herbicidal Effect Test A herbicidal effect test was conducted using the granules of Example 7.8.9 and Reference Example 8.9.10. The test method is shown below.

After using a Wagner pot of 1/5000 are, and making it into the condition at the time of puddling, sow 30 grains of Japanese millet and mixed seeds of azalea, azalea, and Japanese azalea in each pot, 5
Il11 spear soil. On the 8th day after weed sowing, test granules 1 (5
The equivalent amount of kg/10 a was removed, and 10 days after the drug treatment,
After 20 days, 50 days, and 40 days, the remaining amount of Japanese millet, Japanese azalea, Kikasifushi, and Japanese coryza was investigated. The water depth during the chemical treatment was about 3 crn, and after that the water depth was maintained at 5 cIn by bending the water. The results are shown in Table 4.

Table 4 It has an extremely excellent sustained release effect and is extremely useful biologically, such as avoiding drug damage and extending the duration of drug efficacy. 1 [Effects of the Invention] As is clear from the above explanation, the sustained-release granular pesticide of the present invention uses an isocyanate compound and liquid paraffin together as a coating layer, so that they complement each other's coating unevenness and This not only prevents coating non-uniformity and pinhole formation compared to when used alone, but also makes it possible to obtain a remarkable sustained release effect with a small amount of use.

Furthermore, by using an organic powder or an inorganic powder in combination with this, the sustained release effect can be further improved by eliminating the small amount of pinholes that still exist even when the above two types of compounds are used in combination, due to the filling effect of the powder. In addition, it is possible to reduce the amount of each used.

Furthermore, according to the present invention, the sustained release effect can be freely controlled by adjusting the amount of additives used, and furthermore, biological effects (extension of residual effects, prevention of drug damage), which were not possible with conventional techniques, can be achieved. Avoidance)
It is possible to obtain sufficient sustained release properties. On the other hand, after the isocyanate compound and liquid paraffin are completely coated, oil-absorbing fine powder such as white carbon, diatomaceous earth, etc. is used as powder9, and other active ingredients for agricultural chemicals are adsorbed or coated via a binder. By doing so, it is possible to obtain granular pesticides that support active ingredients in a multilayered structure, and it is also possible to release multiple active ingredients at different rates.

Further, the additives used in the present invention can achieve sufficient effects with a relatively small amount, and no special steps are required in the manufacturing process, so that they are practical from an economical and industrial standpoint.

As mentioned above, the sustained-release granular pesticide of the present invention has several excellent features not available in conventional sustained-release preparations, which will be summarized below.

1. Since the sustained-release granular pesticide according to the present invention can freely release active ingredients, the duration of its medicinal efficacy is significantly extended. As a result, it is now possible to reduce the number of times of spraying, compared to the conventional method of spraying in multiple times. In addition, especially in seedling boxes, which is a growing form of paddy rice that has been frequently used in recent years, the chemicals that should normally be sprayed on the rice fields after rice planting are applied at a high density during the seedling growing stage (because the area is small, spraying is very easy). ) can be sprayed, etc., which has a large labor-saving effect.

2. Even if the active ingredient has a harmful effect (phytotoxicity) on the plant body if it is eluted at a high level of 111% at a time, it is possible to keep the concentration to a low enough range to obtain medicinal efficacy. This can be avoided while maintaining the medicinal effect for a longer period of time with multiple spraying treatments. Furthermore, it has the advantage that it is safer for fish and shellfish and wildlife because a high concentration of the drug does not elute at once.

Claims (1)

[Scope of Claims] () A sustained-release granular agricultural chemical, characterized in that a granular composition containing all of an agricultural chemical active ingredient and a carrier is provided with a coating layer comprising an incyanate compound and a liquid rough indium compound. (2) A granular composition containing all of an agricultural chemical active ingredient and a carrier is provided with a coating layer consisting of an isocyanate compound and a fluid rough-in, and a coating with an organic powder and/or an inorganic powder as an outer layer. Release-release granular pesticide.