JPH07324002A - Material packed with agrochemical - Google Patents

Abstract

PURPOSE:To obtain a simply producible fumigant of agrochemical capable of readily and hygienically controlling harmful organisms in soil. CONSTITUTION:This material packed with agrochemical is preserved in a liquid and is obtained by wrapping a fumigant in a liquid state as it is to control harmful organisms in a gas in a film having high barrier properties and characteristics of losing barrier properties by coming into contact with water. The material packed with agrochemical is simply and hygienically handleable without impairing controlling effect and without feeling irritation and is readily producible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has the property that a pesticide active ingredient, which is volatile at room temperature, may be ruptured or pinholes due to water vapor, water droplets, or water in the soil to lose the gas barrier property (referred to as water-breaking property). A pesticide package packaged with a film that has a high gas barrier property and is used for controlling agricultural pests. Agricultural chemicals that exert their effects) can be used more safely and conveniently, and can be manufactured more easily.

[0002]

2. Description of the Related Art Chlorpicrin, methyl bromide, DD have been conventionally used for controlling pests that damage agricultural crops.
Fumigants for soil disinfection such as chemicals are often used. These agents are used by injecting them into the soil when cultivating fields and arranging them, but sprinkling water over them in order to prevent the active ingredients from escaping into the atmosphere and increase their efficacy or suppress irritating odors. It is then generally water-sealed or covered with an agricultural film. Since these chemicals are highly volatile, have a peculiar irritating odor, and are highly toxic, even if used properly, they may cause discomfort to the user or residents around the treated field, and may cause health problems depending on the situation. Could give you. In addition, since it is necessary to be careful, it is complicated to prepare a special processing machine. In order to solve these problems, a method of packaging a fumigant with a water-soluble film and simply using it has been introduced. However, if the fumigant is packaged as a liquid in a water-soluble film, it has not been put into practical use because the fumigant easily leaks from pinholes and heat-sealed portions of the film. In order to solve these problems, a method of tableting with a gelling agent and packaging with a water-soluble film is disclosed in JP-B-47-1799, JP-B-47-1800,
JP-A-62-192301, JP-A-63-230602
Etc. However, the jelly or solid obtained by these methods is soft and has no strength,
It has the drawback of returning to a liquid or collapsing due to vibration during transportation. In order to compensate for this drawback, a method of maintaining the gel strength by adding synthetic rubber or a cellulose derivative has been disclosed, but since the active ingredient that easily gasifies may cause problems of irritation and toxicity, its production method is gelation. It is better to manufacture with a simple formulation as much as possible without using various additives such as agents and gel strength enhancers as much as possible. Further, a method of vacuum packing to prevent leakage to the outside and oxidation by oxygen in the air during packaging in a water-soluble film is disclosed (JP-A-62-192301). Since some of the active ingredients may flow out, it is better to make the preparation form in which there is no problem even if a vacuum is not applied. On the other hand, a method of adsorbing a fumigant on an adsorbent and storing it in a water-soluble resin container (Japanese Patent Laid-Open No. 56-45401) has also been disclosed, but it has not been put to practical use due to economic reasons.

[0003]

[Problems to be Solved by the Invention] Active ingredients for soil disinfection that are easily gasified are solidified using gelling agents, oil absorbents, synthetic rubbers, flammable organic solvents and various additives, vacuum packing, etc. This patent is to make it into a drug form that can be easily manufactured at low cost without performing complicated forms and operations, so that the user can conveniently and hygienically use it, and sufficiently exert the original efficacy of the active ingredient. Is the subject of.

[0004]

The present inventors have arrived at the present invention as a result of earnest research on a technique capable of satisfying the above-mentioned problems. That is, the present invention more easily produces a pesticidal active ingredient for the purpose of controlling pests in soil by storing it in a liquid state (hereinafter, referred to as the pesticidal active ingredient), and makes it easy for the user to use. Regarding the drug form made possible, the pesticidal active ingredient is packaged by a high gas barrier film (hereinafter referred to as the packaging film) having a water-disintegrating property as a liquid without being solidified by using a gelling agent or the like. The present invention relates to a package. When this package is treated on the soil surface of the field or in the soil at a predetermined interval with a predetermined amount and covered with a sheet etc. as necessary (especially in the case of soil surface treatment), the conventional liquid agent irrigation treatment Pests in soil can be controlled easily and hygienically. In other words, the treated packaging body can control pests by piercing the packaging film with steam or water droplets, releasing the pesticide active ingredient of the contents and diffusing into the soil in a gaseous state. it can. The present invention will be specifically described below. The pesticidal active ingredient that can be used in the present invention has an activity of controlling insects, weeds, diseases and the like which live in soil for a lifetime or a period of time and which harms useful plants such as agricultural crops, for example, D-D. (Mixture of 1,3-dichloropropene and 1,2-dichloropropane), D
BCP (1,2-dibromo-3-3chloropropane),
DCIP (dichlorodiisopropyl ether), MIT
C (methyl isothiocyanate), chloropicrin (trichloronitromethane), methyl bromide (bromomethane), dimethyldichlorovinyl phosphate and the like can be mentioned. However, the pesticidal active ingredient used in the present invention is not limited to the above, and any pesticidal active ingredient that can be stored in a liquid and shows control activity against pests in a gaseous state is applicable, and one kind or a combination of two or more kinds may be used. May be used.

The method for producing a pesticide package of the present invention is the minimum necessary organic solvent, surfactant and decomposition prevention for the pesticidal active ingredient to efficiently exhibit the characteristics of a fumigant without impairing its activity. You may dissolve and use auxiliary agents such as agents,
By packaging this pesticide composition (hereinafter referred to as the pesticide composition) in the packaging film in a liquid state, a pesticide preparation package can be easily obtained. Further, in the present invention, when packaging a drug of several grams or more, it is possible to prevent the contents from being offset in the package by dividing one package into cells with a heat seal, and to treat the soil surface. This is advantageous because it is possible to prevent the dispensed drug from being localized due to the inclination or unevenness of the surface. The drug in such a form is particularly suitable as an agrochemical active ingredient that volatilizes a stimulating gas such as chloropicrin.

The packaging film that can be used in the present invention does not necessarily need to be soluble in water, but it must be water-disintegrating, and the pesticidal composition contained therein can be permeated in a liquid or gaseous state during storage, Any film having a certain strength that does not dissolve in the agrochemical composition may be used, and it may be selected according to the properties of the agrochemical composition to be contained, the storage and the use condition. Generally, it is selected from films of polyvinyl alcohol, modified polyvinyl alcohol, carboxymethyl cellulose, hydroxyethyl cellulose, polyvinyl pyrrolidone, polyacrylic acid and its salts, starch, gelatin, etc., but when the gas barrier property is low, two or more types are used. It must be made into a film that can be put to practical use. Above all, it has high gas barrier properties and film strength,
As a packaging material, a film having water-disintegrating property, which is obtained by laminating a water-soluble film on paper, non-woven fabric, fiber or the like, or by coating or impregnating a water-soluble film-forming substance, is particularly excellent as the packaging material. Furthermore, the thickness of the film is also selected within a range that can be put to practical use depending on the type and amount of the pesticide composition to be included or the material of the film, and is not particularly limited. For example, 10 μm or more is preferable from the viewpoint of chemical resistance, strength, etc., and particularly Desirably, it is about 20 μm to 80 μm.
Although the weight of one package of the present invention is determined by the amount of treatment agent per unit area, for example, about 1 g to 200 g is suitable. If a large packaging unit is required, it may be divided into cells to prevent uneven distribution of contents and to prevent it from leaking if it leaks. In the case of the agrochemical composition which does not interfere with the adhesiveness, it is easy to divide it by heat sealing.

[0007] The shape of the package should be such that it can be easily embedded when it is treated in soil, but at the same time it is necessary to give importance to the economical efficiency during processing, and there is no particular limitation such as a cylinder, a sphere or a square bag. The package may be attached on the tape at regular intervals to facilitate soil treatment. In addition, the packaging itself is formed into a tape and the pesticide composition is put therein and divided into predetermined lengths by heat sealing or the like, or a predetermined amount of the pesticide composition is included at predetermined tape-shaped positions. Roll in a roll and, when used, cut linear grooves at regular intervals in the cultivated field, place the pesticide package linearly in the groove, and simply apply soil disinfectant if the soil is spread. You can In this case, the size of the roll, the length of the tape, etc. may be determined as necessary, but generally 100 g which is easy to carry.
About 10 kg is good, and it is convenient to put perforations in the heat-sealed part so that it can be easily cut at regular intervals. Since the water-disintegratable film is weak against moisture, it is necessary to package such packages one by one or several in a package with higher moisture resistance or store them in a place adjusted to low humidity. is there.

[0008]

EXAMPLES Examples and test examples are shown below, but the present invention is not limited to these. Example 1 3.0 g of chloropicrin was placed in a 5 cm × 5 cm square bag made of water-soluble paper dissolver WAL (manufactured by Mishima Paper Co., Ltd.),
It was heat-sealed to obtain a fumigant package.

Example 2 3.0 g of chloropicrin was added to a water-soluble film S-400C.
It was put in a 5 cm × 5 cm square bag made of W (manufactured by Nigo Film Co., Ltd.) and heat-sealed to obtain a fumigant package.

Example 3 1 g of chloropicrin was put into each of 10 cm intervals of a thin bag having a width of 2.5 cm of a water-soluble film S-400CW (manufactured by Nigo Film Co., Ltd.) by tape, and a fumigant tape was packaged. Got the body

Example 4 12 g of chloropicrin was added to a water-soluble film S-400CW.
It was placed in a square bag (manufactured by Nigo Film Co., Ltd.) of 10 cm × 10 cm, heat-sealed, and a heat-sealing line was further placed in the center of the length and width to obtain a fumigant package which was divided into four parts.
The heat seal had good adhesiveness and could be easily manufactured. Test example: Test condition Test insect: Sweet potato Nematode (Nematode highly contaminated soil) Test plant: Tomato (Variety: Sugar lady) Test scale: Each ward: 2 are fields Treatment method: The packaging of Examples 1 and 2 In 30 cm intervals, in Example 3, 10 to 15 cm in parallel at 30 cm intervals.
It is embedded in soil at the depth of, and the control chlorpicrin solution is a manual irrigator with a space of 30 cm in front, back, left and right, and a depth of about 10 c.
irrigated with m.

Investigation method: Workability evaluation: The impression handled by the worker was recorded. Environmental evaluation: The symposium stood downwind of the test area and recorded irritation and the like. Evaluation of control effect: After treatment with a chemical agent, coating with a polyvinyl chloride film for 10 days, degassing for 5 days, transplanting tomatoes, surface irrigation once a day, and 27 days later, the degree of root nodules is shown in Table 1 below. It investigated by the standard.

[0013]

[Table 1] Table 1 Damage index: Root nodule formation status Index Root nodule formation is not observed at all 0 Rooted ridge formation is slightly recognized 1 Moderate root ridge formation is recognized 2 Most root ridge formation is recognized 3 Continuously 3 Root formation is recognized 4

Test results: Workability evaluation: Examples 1 to 3 did not particularly feel irritation,
Although it could be handled directly by hand, the control case had irritation to the eyes and nose at the time of pouring the chemical solution into the irrigator and soil irrigation, and required a gas mask and protective glasses. Environmental evaluation: Examples 1 to 3 did not feel any odor or irritation, but the control example felt a slight chlorpicrin odor and a slight eye irritation.

Evaluation of control effect: The average degree of rooting of the reagent is shown in (Table 2). The results are shown as the average value of those tested at n = 4 (4 consecutive times).

[0016]

[Table 2]

The soil treatment agent package obtained in this example is an agent capable of maintaining the nematode effect for a long period of time. As described above, the packages of the examples were not irritating, and the packages could be directly and simply and hygienically treated into soil, and the pesticidal active ingredient was sufficiently maintained, which was extremely practical.

[0018]

Industrial Applicability According to the present invention, an irritating drug can be easily formed into a pesticide formulation package without complicated operations, and further, easy spraying, sanitary spraying, etc. can be achieved.
It showed the same biological effect as before. The present invention thus provides a fumigant package having many advantages.

Claims (4)

[Claims] 1. A pesticide package, characterized in that a pesticide active ingredient having room temperature volatility is packaged in a film having water-disintegrating property and high gas barrier property. 2. A pesticide active ingredient having room temperature volatility is divided,
The pesticide package according to claim 1, which is encapsulated. 3. The pesticide package according to claim 1, wherein the pesticide active ingredient having room temperature volatility is chloropicrin. 4. A pesticide package according to claim 1, wherein the film having water-breaking property and high gas barrier property is a polyvinyl alcohol film using paper or non-woven fabric.