JPS5843049B2 - Method of dispersing chemicals - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of spraying a foamy chemical that is effective for exterminating pests and removing bad odors from garbage dumps.

When applying chemicals to the floors, pillars, or under floors of houses in order to exterminate pests such as termites and cockroaches that eat away at houses, it is possible to spray the chemicals evenly and evenly, and to completely remove the active ingredients. It is desirable to absorb it into flooring materials, etc.

Particularly when controlling termites that damage the flooring and pillars of houses, it is necessary to evenly spray the termiticide over the woody parts to be protected and the adjacent soil.

Conventionally, this type of agent is commonly used in the form of an oil or emulsion for woody parts, and an emulsion or granule for soil surfaces. However, since the application surface is vertical, it is difficult to secure a sufficient effective amount of the drug, and it is necessary to apply it many times.

Furthermore, in places where working conditions are particularly severe, such as under the floor, there is a drawback that work efficiency and pest control effects are reduced, and at the same time, it is not favorable for the health and hygiene of workers.

The present inventors were conducting research on a method for controlling termites, etc., and found that by turning the chemical into a foam, it was possible to maintain the spray state for a long time at the application site, and the area to be protected was on the wall surface. It has been found that an effective amount of the drug can be reliably absorbed even if

The inventors have also found that this foamed agent is effective in removing odors from garbage dumps.

That is, in the chemical dispersion method of the present invention, a porous member such as a perforated plate, a net, a sponge, a nonwoven fabric, a metal scrubber, etc. is attached to the tip of a cylindrical body, a blower is provided at the base of the body, and a chemical spraying device is installed in front of the blower. Using a spraying device equipped with a nozzle, the drug delivered in the form of a diluted liquid is ejected from the spray nozzle, and at the same time, a blower sends air from behind the spray nozzle.
The method is characterized in that the spray liquid collides with a porous member in front of the nozzle, and the chemical is dispersed while foaming at a rate of about 150 to 5001/Ky.

A specific example of the spraying device used in the present invention will be explained using the drawings.

FIG. 1 is a schematic cross-sectional view showing an example of an apparatus used in the method of the present invention.

The main body 1a is a cylindrical body with a rectangular cross section and the negative side is open. A perforated plate 3 having a large number of small holes 2, 2, 2, etc. is attached to the open side, and a perforated plate 3 is attached to the base of the main body 1a. A blower 4 with a fan 5 is connected.

This blower 4 is an electric type, and simply by turning on the power, it rotates the fan 5 at a constant rotation speed.

A nozzle 9 having a spray nozzle 6 attached to its tip is attached inside the cylindrical body (hereinafter referred to as the cylindrical body) 1a.

The other end of this pipe 7 is connected to a tank 9 containing a drug diluted liquid 10, and a pump 8 disposed in the middle of the pipe I guides the drug diluted liquid 10 in the tank 9 to the spray nozzle 6. I'm nervous.

In this embodiment, only one spray nozzle 6 is provided at the center of the cylindrical body 1a, but the number of spray nozzles 6 is not limited to one, and may be two.

Further, the perforated plate 3 attached to the tip of the cylindrical body 1a may be replaced with a mesh material having fine meshes.

Moreover, the main body shape is not limited to a cylindrical shape, but can also be a box shape.

FIG. 2 is a schematic cross-sectional view showing another example of the apparatus used in the method of the present invention.

The main body 1b is a cylindrical body whose side wall has a bellows shape that can be expanded and contracted in the middle, and a mesh material 11 is attached to the tip of the cylindrical body 1b.
An electric blower 4 having a fan 5 is connected to the base.

On the other hand, if the spray nozzle 6 is attached to one end, the hose 12 whose other end is connected to a separately provided tank 9 is connected to the spray nozzle 6.
is located near the tip of the cylinder 1b, and the drug diluted liquid 10 in the tank 9 is sent to the tip of the cylinder 1b via the pump 8 provided in the middle of the hose 12, and the spray nozzle 6
so that it is sprayed in the direction of the net material 11.

In the device shown in this embodiment, since the main body is a cylindrical body having a bellows-shaped side wall, the spraying direction can be changed freely, and it is suitable for spraying in narrow areas such as under the floor.

In the devices shown on each side above, when both the pump 8 and the blower 4 are operated at the same time, the chemical solution sprayed from the spray nozzle 6 by the operation of the pump 8 is first transferred to the perforated plate 3 or the mesh material 11.
(The spray angle and distance of the spray nozzle 6 are set in advance so that such an effect can be obtained).

In this state, the chemical solution is turned into foam by the wind generated by the fan 5 located behind the spray nozzle 6 on the back surface of the perforated plate 3 or the mesh material 11, which flows outward from the small holes 2, 2, and so on. They will move in one stream to their destination.

The distance achieved by the foam is determined by the airflow rate of the fan.

The chemical solution 10 filled in the tank 9 consists of an active ingredient diluted with water to a practical concentration and a foaming agent for foaming the active ingredient, and a foam stabilizer etc. may be mixed in if desired. good.

In the present invention, the foaming ratio (the ratio of foam volume to weight) is an important requirement for foaming and dispersing a drug using the above-mentioned device.

The foaming ratio varies slightly depending on the spraying equipment used, the type and prescription of the drug, the type and prescription of the foaming agent, etc., but the foaming ratio is
Approximately 150-5004 per KP, preferably 200-4
It is necessary to be able to form a foam with a volume of 0.001, and if the foaming ratio is lower than this, the foamed agent will be difficult to stay on the surface of the woody part, and most of it will flow onto the soil surface.
It is not possible to secure a sufficient amount of the chemical in the woody part, and on the other hand, if the foaming ratio is higher than this, the concentration of the chemical in the foam will be small and the foam will disappear easily, so it is necessary to use a large amount of the chemical. uneconomical.

In order to obtain such a foaming ratio, for example, approximately 1 to 6 cups (by weight) of a foaming agent is added to the diluent solution in which the active ingredient is diluted to a practical concentration under an appropriate formulation. Add as desired.

Such a diluted liquid is sprayed using a dispersion device having the above-mentioned configuration, and the diluted liquid is sent to the spray nozzle by a pump that operates simultaneously with the blower, while the forced air by the blower is used to spread the diluted liquid to the spray nozzle. Foam is generated by colliding with the back side of a board or net.

The device used at this time is, for example, the one shown in Figure 1, which is a porous metal plate with a diameter of 15 to 20 crrL, the diameter of the hole is about 2 to 3 + m, and the distance between the centers of the holes is about 3 to 5 m. In the case of , or in the case of the above-mentioned perforated plate, when the diameter of the hole is about 1 north and the distance between the centers of the holes is about 2 degrees, the liquid feeding pressure is about 2 to 4K.
y/cr/l and the air flow rate can be appropriately selected from the range of about 15 to 40 vo/min.

In addition, when using a net, it is also a good example to use two commercially available insect repellent nets stacked on top of each other.

Moreover, in order to ensure the above-mentioned foaming ratio, it is desirable that the chemical solution containing the active ingredient has a formulation that does not contain organic solvents that impair foaming properties.

For example, the presence of solvents such as xylene, toluene, and white kerosene significantly impairs foaming properties, so it is desirable to minimize their presence as much as possible.

Therefore, the drug is preferably in a powder or solid water-soluble or water-suspended formulation, such as a wettable powder or tablet.

However, an emulsifying formulation comprising a liquid active ingredient mixed with an organic solvent (for example, a glycol solution) and a surfactant that do not impair foaming properties may also be used.

In the case of a suspension formulation, the formulation must provide suspended particles fine enough to be transported to the area to be protected by foam.

Drugs with such formulations can be easily prepared by conventional methods for producing water-use pesticides.

The foaming agent can be appropriately selected from those with properties that can give the diluted solution of the drug the above-mentioned foaming ratio. higher alkyl sulfates (e.g. sodium lauryl sulfate, etc.); higher alkyl (especially alkyl groups having 11 to 13 carbon atoms) benzene sulfonates, such as sodium lauryl benzene sulfonate;
Foaming organic sulfonate compounds such as polyoxyethylene alkyl sulfates can be used.

Among these, higher alkyl sulfates are preferably used.

Foam stabilizers may also be added to increase suds persistence and are usually incorporated into the foaming agent rather than the active drug.

For example, higher alcohols such as lauryl alcohol, carboxymethyl cellulose, polyvinyl alcohol, sodium alginate, glue, polyacrylic acids, etc. can be used.

Test Example In order to find out the preferred range of foaming ratio in foaming construction, the formulation of chlordane emulsion, using the equipment shown in Figure 1,
By changing the formulation of the foaming agent, the foaming ratio, the time required for spraying, the amount of chemical required, and the amount of chlordane deposited were investigated.

(1) Equipment Perforated plate diameter 20 crl L 1 hole diameter 1 distance, distance between holes 2 mm (2) Spraying conditions Air volume 207F + 7 minutes Liquid feeding pressure 2
2/min (3) Chlordane emulsion, prescription (ratio by weight) \8.123456 Or chlordane 40 40 40 40 404 width 4-chlorophenyl-3'-iodofb Nomo Okishi 4 Male 656666 Mar prescription ≧＼ Mixture of surfactants 0 0 0 0 0 0 Foam stabilizer 0 Ether alcohol presolvent 4 8 1 2 3 4 (4) Foaming agent formulation (proportions are by weight) Polyoxyethylene ( 1) Lauryl sulfate ammonium 0 Polyoxyethylene (2) Lauryl sulfate ammonium 0 Polyoxyethylene (3) Lauryl sulfate ammonium Lauryl sulfate ammonium 0 Ether alcohol solvent water 20 20 20 20 50 50 50 50 (5) Preparation of diluted solution The chlordane emulsion of the above formulation is diluted 20 times (W/W) with water, and a foaming agent selected from the above is added thereto to a concentration of 3% to obtain a chemical solution for foaming construction.

(6) Measurement of foaming ratio Before sending the foam into the underfloor model described below, the foam was placed in a fiber drum and the foaming ratio was determined according to the following formula.

Eyu (#/Kp) = 1TKt<-V5~Volume ('
) Weight (Kp) of the foam fiber dryer drum drum (7) Underfloor model height 50 cIrL x width 150 crrL x length 300ff
Make a plywood frame (i) on the soil surface.

A small window is cut out in the plywood at the front in the lengthwise direction to allow the insertion of a foaming machine (appropriate measures are taken to prevent foam from flowing backwards during installation).

The middle part in the length direction is partitioned with plywood, and the front is the first room, and the back is further divided into two rooms with plywood in the width direction.

Each of the plywood partitions has 1 horizontal strip to allow the bubbles to pass through.
A small window of 50 crrL x 30 crrL is cut out.

Bubbles are sent to the first chamber, second chamber, and third chamber in this order.

A small window is also cut out in the inner wall of the third chamber, which is in front of the opening of the second chamber (to vent air).

On the inner wall of the first chamber farthest from the opening with the second chamber,
5crrL125crIL145cr from above the floor, near the opening on the inner wall on the second room side of the opening between the second and third chambers, and on the inner wall where the opening of the third chamber is located, and near the opening.
At rL1, place a test piece of wood (straight-grained surface 2CrrL x 6cr
IL x Thickness 0.5crrL0 The end of the wood is sealed with epoxy resin) (wood piece number: No. 1)
1,2°3 from the top in the chamber, 4,5,6 from the top in the second chamber
．． 7.8.9 from the top in the third room).

A transparent synthetic resin film is placed on the top of the underfloor model.

Close the air vent when bubbles begin to escape from the air vent in the third chamber.

;8) Analysis of the amount of chlordane deposited 24 hours after the foaming process, a test piece of wood is taken, extracted with a solvent by a conventional method, and analyzed by gas chromatography (EDC).

;9) Results One test was conducted for the six construction areas shown in the table below, and the results are as follows.

Construction area and ■ are control areas.

In cases (1) to (V) of the present invention, various foaming ratios were obtained by changing the formulation of the Roldane emulsion and the formulation of the foaming agent.

In construction zones ■ to V, the foaming properties were approximately 200 to 400 times higher, and the construction time was significantly shorter than in control zones I and ■.
Moreover, the amount of chemical solution required is extremely small.

The amount of chlordane deposited on the control area 1, the upper part of the floor in ■■
.

The adhesion was less than 0.5 g/m2 in ■, and remained between 0.5 g/m2 and 1 g/m2 in the intermediate areas ■ and ■, resulting in variations in adhesion, whereas stable adhesion was obtained in the area of the invention. (Especially in Wards ■ to V, 2g/
(more than m2 attached).

If the foaming property becomes too high as in Section 2, foam that is easily defoamed will be formed, and most of the foam will disappear due to the resistance under the floor (e.g. ventilation holes), and as in Section 1, where foaming performance is poor, foam will be formed in the second chamber. , 3rd
It was not possible to fully fill the chamber with foam.

In construction areas U and ■, a slight loss due to defoaming was observed compared to areas m, iv, and v, the construction time was slightly longer, and the amount of adhesion in the third room was slightly lower than in the practical range. It was recognized that there is.

For these reasons, the more preferable construction method is approximately 200~
■ The foaming ratio was 4001/Ky.

It was determined to be in wards IV and V.

Hereinafter, the present invention will be explained in more detail using Examples.

Example l Chlordane raw material 40 articles (converted to purity 100) Mixture of nonionic surfactant and anionic surfactant Section 5 Naphthalene sulfonic acid soda formalin condensation 8% hydrated silicic acid and finely powdered calcium carbonate 47 % The above ingredients are uniformly mixed and ground to make an irrigation agent.

Dilute this irrigation agent with water, for example, 20 times (for example, IKP
(191) water conservancy (suspended in 191 water).

Separately 45% sodium lauryl sulfate
Sodium dodecylbenzenesulfonate 20% lauryl alcohol 5 steamed water
2 to 3 φ of a foaming agent prepared by uniformly mixing 30% of the foaming agent is added to the diluted solution.

The diluted solution prepared in this manner is subjected to forced ventilation using, for example, the apparatus shown in FIG. The spray liquid is made to collide with a perforated plate or a mesh to give a foaming ratio of about 150 to 5001/Kp, preferably about 200 to
4001/2, spray the chemical while foaming.

According to the above method, a foaming test was conducted by changing the test chemicals, foaming agents, and spraying conditions as shown in Table 1 below.

The results were as follows. Regarding the foam dispersion situation, the foamability was low in sections A to C, and it was thought that it would be difficult to apply it to large-scale construction.

In Section A, the foaming ratio was low because an emulsion using xylene as a solvent was used, and in Section B, the foaming ratio did not increase because the pore diameter of the perforated plate was large and the center distance between the holes was too wide. In Section C, the pore diameter was made smaller, but the foaming ratio could not be increased because the center distance was too wide compared to the pore diameter.

Example 2 Chlordane raw material 60% (purity loo% conversion) 4-
Chlorophenyl-37-iothopropargyl formal 15 Mixture of nonionic surfactant and anionic surfactant 15φ Naphthalenesulfonic acid sodium formalin condensate 10% Mixed uniformly with the above to form an emulsifying composition.

This is diluted, for example, 30 times with water.

Separately 30% sodium lauryl sulfate
Sodium dodecylbenzenesulfonate 10φ lauryl alcohol 4% water
Add 2 to 5 times of a foaming agent prepared by uniformly mixing 30 times polyoxyethylene lauryl sulfate soda and 25 times polyvinyl alcohol to the diluted solution.

The diluted solution prepared in this manner is used, for example, in the apparatus shown in FIG. Using a device with a hole diameter of 2 mm and a center-to-hole distance of 3.5 mm, the sprayed liquid was caused to collide with the net material by forced air flow, resulting in approximately 150 mm.
2 to 5001/Ky, preferably about 200 to 4001/Ky
The chemical is sprayed while foaming at a foaming ratio of .

Example 3 The apparatus shown in FIG.
Using a device with rIL1 hole diameter of 1 mm and center-to-hole distance of 2 mm, a chlordane emulsion is produced at a foaming ratio of 200 to 500 d/Ky at an air flow rate of 20 d/min and a liquid feeding pressure of 2/min. (Using an ether alcohol solvent as the solvent) A diluted solution (containing a foaming agent) is foamed and sprayed to prevent or control termites under the floor.

As is clear from the above description, according to the method of the present invention, the termite control agent can be applied under the floor (for example, after construction) by spraying the foamy agent to have a foaming ratio of about 150 to 5001/5'. It is useful not only for application to tunnel cultivation (which may be applied during construction), but also for controlling pests and diseases in the soil or crops in the tunnel in so-called tunnel cultivation, disinfecting the space, and for planting useful plants. or control of pests and diseases in soil or plants that have already been planted;
It can be applied to all fields where foam-based agents can be applied, such as preventing bad odors at garbage dumps.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing one example of the spraying device used in the method of the present invention, and FIG. 2 is a schematic cross-sectional view showing another example of the spraying device used in the method of the present invention. In the figure, 1...Main body, 2...Small hole, 3.
...Wire mesh, 4...Blower, 5...
・Fan, 6...Spray nozzle, 7...
Pipe, 8... pump, 9... tank, 11... wire mesh.

Claims (1)

[Claims] 1 Using a spraying device consisting of a porous member attached to the tip of a cylindrical body, a blower installed at the base, and a nozzle for spraying the drug in front of the blower, the drug delivered in the form of a diluted liquid is sent from the spray nozzle. A method for dispersing a drug, which comprises spraying and simultaneously causing the spray liquid to collide with a porous member provided in front of a nozzle using air from an air blower, and dispersing while foaming at a rate of about 150 to 5001/Kp.