JPS63197563A - Method and apparatus for scattering chemical agent - Google Patents

Abstract

PURPOSE:To safely and easily scattering a chemical agent dangerous to a human body, by mixing a dilution liquid of the chemical agent and a foaming base agent with compressed air and scattering the resulting liquid mixture while foaming the same in a froth state. CONSTITUTION:Valves 18, 20, 26, 28 are preliminarily regulated at the time of the initial operation so as to obtain a foaming magnification of about 5-100l/kg and a pump 16 and a compressor 24 are energized to start work. The dilution liquid of a chemical agent and a foaming base agent sent through a pipe point is mixed with the air sent through the other pipe joint at the T-shaped pipe part of a foam gum 14 and foamed in a froth state to reach a nozzle 52 from the outlet part of the pipe part through a hose 50 having a length of 5-40m to be emitted as foam. When the state of the scattered foam is set so that the emitted foaming base agent is not formed into mist and the foam is allowed to fly up to about 5m in a lumpy form, the chemical agent can be easily scattered in a state safe to a worker.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for spraying a foamy chemical that is effective for exterminating pests, removing bad odors from garbage dumps, and treating wood with anti-fungal and anti-termite treatments. The present invention relates to a drug dispersion device that can be implemented.

[Prior art and its problems 1] When applying a chemical to the flooring, pillars, or floors of a house to exterminate pests such as termites and cockroaches that eat away at the house, it is difficult to apply the chemical evenly and uniformly. It is desirable that the active pharmaceutical ingredients can be sprayed onto the floor and be absorbed by the flooring material. Particularly when controlling termites that damage the flooring and pillar materials of houses, it is necessary to evenly spray the termiticide over the woody parts to be protected and the adjacent soil.

In the past, chlordane was often used as a termite extermination agent, but although this agent has a high termitecidal power, it has low biodegradability, so today, organic phosphorus agents are mainly used. However, organophosphorus drugs have acute toxicity, and this acute toxicity is higher than that of chlordane, which lowers cholinesterase in the blood when absorbed into the human body.

When spraying chemicals for termites, workers working under the floor use full-face masks and gloves to protect themselves from exposure to the chemicals, but it is currently difficult to completely escape from the scattered chemical particles. . Furthermore, since the emulsion must be sprayed by crawling under the floor after the oil has been sprayed, there are many opportunities for contact with the chemicals, and this work is labor-intensive.

[Means for Solving the Problems] Therefore, an object of the present invention is to provide a method for easily and safely dispersing a dangerous drug to the human body.

Another object of the present invention is to provide a chemical dispersion device capable of carrying out the above method.

To achieve this objective, the present invention involves mixing a dilute solution of the drug, a foaming base, and pressurized air to form a mixture, and dispersing the mixture while foaming the liquid drug to about 5 to 100 /
To provide a method for dispersing a drug, which is characterized in that the drug is sprayed while foaming at a proportion of Ay.

The present invention also provides a method of heating a diluted solution of a drug and a foaming base with pressurized air to form a mixed solution, and heating this mixed solution to about 5-100%
A drug dispersing device that sprays foam while foaming at a ratio of 4/Kg, comprising: a drug tank containing a diluent consisting of a drug and a foaming base; a means for supplying pressurized air; and a drug tank. a foaming means connected between the pressurized air supply means and for mixing and foaming the liquid from the drug tank with the pressurized air from the pressurized air supply means; The foaming means includes a pump for feeding to the foaming means and a discharge means connected to the discharge port of the foaming means, and the foaming means mixes the diluted solution and pressurized air sent to the foaming means to generate about 5 to 100 I/Kg. To provide a drug dispersion device characterized by foaming into a foam at a rate of .

[Operation and Effect] According to this method, a diluted solution made by mixing a toxic agent such as a termite extermination agent and a foaming base is sprayed under the floor in the form of foam, so the spraying work is done in one step. In addition to being faster, it reduces exposure to fine drug particles such as mist compared to existing high-pressure spray methods.

The chemical spraying method according to the present invention is different from existing foam construction methods and is similar to the high-pressure spray method (a worker enters under the floor etc. and sprays the chemical to the target area, but the spray liquid turns into foam). Because it is discharged from a nozzle, the concentration of chemicals that workers are exposed to is extremely low, and unlike conventional foam construction methods, it is not possible to spray the chemical to the target area, and workers are exposed to large amounts of chemicals, unlike high-pressure spray methods. It can solve the drawbacks of conventional extraction techniques.

The foam-like chemical sprayed by the method of the present invention can maintain the sprayed state for a long time at the application site, and even if the area to be protected is a vertical surface, floor material, the bottom of a column, etc., an effective amount of the chemical can be applied. can be reliably absorbed. Furthermore, a spreading agent used to protect the chemical from deterioration and a chemical that has wood preservative and antifungal effects can be mixed with the diluted solution and sprayed at the same time.

Furthermore, the chemical spraying method of the present invention is not only effective for spraying termite extermination chemicals, but also effective for spraying preservatives on wood, removing bad odors from garbage dumps, removing bad odors from livestock barns, and spraying agricultural chemicals. I hope you understand that. However, in addition to termiticides, the agents used in the present invention include foaming bases,
Spreading agents, preservatives, and fungicides are used.

In the "Standard Specifications" and related matters J published by the "Japan Shiroari Countermeasures Association" regarding the prevention and preservation of rot in wooden buildings, the soil treatment methods for each construction area are band spraying and surface spraying. However, while the existing foaming construction method can only perform surface spraying, the chemical spraying device of the present invention can also perform strip spraying, and can save on chemicals (soil treatment agents).

[Example] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, referring to FIG. 1, there is shown an example of a chemical spray vtIl used for actually applying the chemical spraying method of the present invention. The drug dispensing device includes a drug tank 10 containing a diluent consisting of a drug and a foaming base, which drug tank 10 is connected through a conduit 12 to one inlet end of a foaming means, preferably a foam gun 14 described below. It is. A pump 16 is connected to the pipe line 12, and a valve 18 is installed between the suction side of the pump and the drug tank 10.
Two valves 20 are connected to the bypass line 12A of the pump 16 in parallel with the pump 16. ii of the diluent from the drug tank 10 by operating these valves 18.20.
i can be adjusted. This pressure can be confirmed with a pressure gauge 22 provided on the discharge side of the pump 10.

A compressor 24 is connected to the other inlet end of the foam gun 14 and supplies pressurized air to the foam gun 14 . Two valves 26 and 28 are provided in the conduit connecting the compressor 8m24 and the foam gun 14 to adjust the flow rate of pressurized air, and this pressure can be confirmed with a pressure gauge 30.

In the above arrangement, the valve 18°20.2
6.28, the spraying work can be performed immediately from the second time by simply energizing the pump 16 and compressor 24.

The foam gun 14, as shown in FIG. 3, consists of a single-shaped pipe section 32 and two orifices 34 attached to two opposite ends of the pipe section 32. The air or drug and diluent solution of the foam base delivered through the fitting 38 then flows into the pipe section 32 through the orifice 34, where it passes through the orifice 34 and similarly enters the drug and foam base diluent solution from the opposite end. It mixes with the liquid or air and foams into a foam before exiting from the outlet 48 of the pipe section 32. The air or diluent passed through the fitting 38 passes through the orifice 34 and into the pipe section 32 where it mixes with the diluent or air likewise entering from the opposite end and foams into a foam before exiting the pipe. It flows out from the outlet 48 of the section 32.

Returning to FIG. 1, outlet portion 48 of pipe section 32 has a
A .about.40 meter hose 50 is connected and a nozzle 52 is attached to the opposite end of this hose. Nozzle 5
A stop valve 54 is provided between the hose 50 and the hose 50. In this way, the foamed diluent is transferred from the foam gun 14 to the hose 5.
0 and is discharged from the nozzle 52. For example, the sprayed foam should be in a state where the ejected foaming agent does not turn into mist but into a lump of foam and can fly up to about 5 meters away. The spray angle is approximately 15° when the target is 1 meter from the tip of the nozzle 52.

By changing the shape of the injection port of the nozzle 52, the spraying shape can be made circular, oval, or rectangular depending on the purpose of spraying.

The state of the bubbles changes in various ways depending on the relationship between the orifice diameter of the foam gun 14, air pressure, and liquid pressure. This relationship is shown in Figure 6, where the bubble state is G,
It is represented by N and L, where G indicates a state where there is excess air and light bubbles and a lot of mist, N indicates a state when the mixing ratio of air and liquid is optimal, and L indicates a state where there is an excess amount of liquid and is heavy. This indicates a state where there is little mist due to bubbles.

Next, referring to FIG. 2, there is shown another example of a spraying ia that can carry out the chemical spraying method of the present invention. This spraying is carried out using a pressure cylinder 60 filled with a diluted solution of the agent to be sprayed and the foaming base, and a compressor 116 connected to the inside of the pressure cylinder 60 through a pipe 62 above the liquid level.
4.

A valve 6 is provided in the pipe line 62 to adjust the amount of air from the compressor 64.
6 is provided, and this pressure can be confirmed by a pressure gauge 68.

The space 60A above the liquid level inside the pressure cylinder 60 is connected to the pipe line 7.
0 to one inlet end 74 of a foam gun 72, which may be of the construction previously described or of any other suitable construction.

The opposite inlet end 76 of the foam gun 72 is connected to the pressure cylinder 6.
A pipe 78 whose lower end is submerged in the chemical solution in the container is connected. An outlet 80 of the foam gun 72 is connected to a nozzle 84 by a hose 82.

The chemical spraying operation can be started and stopped as desired by simply opening and closing the valve 85.

In this structure, pressurized air sent from the compressor 64 is sent into the upper space 60A of the pressure cylinder 60, applies pressure to the chemical liquid, and the chemical liquid rises inside the pipe 78 to form the foam gun 7.
Go to 2. At the same time, pressurized air is sent from the upper space 60A through the pipe line 70 to the foam gun 72, mixes with the sent chemical liquid as described above, foams it, and discharges it from the nozzle 84 through the hose 82. Become.

According to the present invention, a drug is foamed using the above-mentioned device,
The foaming ratio (ratio of foam volume to weight) is an important condition for spraying. Foaming conditions are approximately 5-801 per alKg
It is necessary to be able to form bubbles with a volume of , preferably 20 to 40 ml. If the foaming ratio is less than this, the sprayed liquid will be difficult to stay on the vertical surface, and if the foaming ratio is lower than this foaming ratio, the volume of the foam will increase and the flight distance of the foam will decrease.

In order to obtain such a foaming ratio, it is necessary to add a foaming base of, for example, 1 to 10
Add as per weight %. Such a diluted solution is sprayed using the above-described spraying device, and at this time, it is mixed in a foam gun, and an appropriate foaming ratio can be obtained depending on the ratio of the liquid and air flow rates.

The relationship between the orifice diameter of the foam gun and the air flow rate and liquid flow rate are shown in FIGS. 4 and 5, respectively. As can be seen from these figures, as the orifice diameter of the foam gun increases, the amount of liquid increases. Good foaming occurs when air pressure and liquid pressure are approximately equal. For example, hydraulic pressure 1K
g/cs2 and the air pressure exceeds 1 to 9/as2, mist tends to come out, but it becomes light foam and is difficult to fall even on vertical surfaces. On the other hand, when the air pressure is 1?1/cs+2 and the liquid pressure exceeds 1 syllable/aR2, the result is foam with a high moisture content. In other words, it is easy to fall quickly on a vertical surface.

The foaming agent can be appropriately selected from substances that provide the above-mentioned foaming ratio as a drug diluent. A foaming surfactant is the basis of the formulation, which will be explained below using examples of the drug dispersion method of the present invention.

The drug used in 111 units consisted of 40% chlorpyrifos and 60% xylol, which was diluted 20 times or 40 times so that the reduction of O rubiriphos was 1% or 2% solution. For example, 1 city drug is 391 or 1
Suspend in 9 liters of water.

Separately, add a foaming agent prepared by uniformly mixing 20% polyoxyethylene alkyl ether, 10% sodium lauryl sulfate, 5% isopropyl alcohol, and 65% water to the above diluted solution. ~10% was added. The diluted solution prepared in this way was first sprayed using the apparatus shown in the figure.

A foaming test was conducted by changing the test chemicals, foaming agents, and spraying conditions as shown in Table 1 below, and the results shown in the table were obtained.

Example 2 The drugs used were 18% Phoxim and 12% S-421.
This drug consists of 70% surfactant and petroleum solvent, and this drug is diluted 30 times to make a 1% solution of phoxim. For example, I Kg of drug is suspended in 291 kg of water. Separately, add a foaming agent prepared by uniformly mixing 30% lauryl sulfate triethanolamine, 10% propylene glycol, and 60% water to the above diluted solution.
Add ~10%. The diluted solution thus prepared was sprayed using the chemical spraying device as described above.

Foaming tests were conducted by varying the test chemicals, foaming agents, and spraying conditions, and the results shown in Table 2 were obtained.

In Example 1.2 of Table 2, the flow rate of the drug diluent was 2 to 31/1n,
However, this can be increased or decreased by changing the orifice diameter of the foam gun. In other words, the construction time can be reduced to 1/3 to 1/4 compared to existing high-pressure spraying.

Ru.

As a result of Example 1, the amount of termiticide absorbed by a 3-inch square was 2.2 to 5.2 g/m2 of chlorpyrifos, calculated from foam absorption a. A 3-inch square, 14°80 cm pillar that termites are eating is divided into three equal parts, two of which are treated using the method of the present invention, and one of which is used as a control.
When left for a day, the termites inside the wood of the treated tree died, but they remained alive for a month in the untreated tree. Furthermore, when two bottles of treated water and two bottles of untreated water were placed in areas where termites were nesting and observed, ant trails were formed in the untreated plants within one week, and feeding damage was observed within two weeks. However, there were dead termites around the treated water, and the termites could no longer be seen approaching from the third day onwards.

From the above, the chemical spraying method of the present invention is not only advantageous for applying termite exterminators under floors (either after or during construction), but also as a preservative for wood preservation. It is clear that spraying of mold agents, flame retardants, and fire retardants can be used in all fields where foam-based agents can be applied, such as extermination of pests in soil or animals and plants, removal of odors from garbage dumps, livestock farms, and sewage treatment facilities, and cleaning of radioactive contaminants. Probably.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a chemical spraying device that can be used to carry out the chemical spraying method of the present invention. FIG. 2 is a schematic diagram showing another example of a chemical spraying device that can be used to carry out the chemical spraying method of the present invention. FIG. 3 is a longitudinal sectional view of a foam gun that can be used in a chemical spraying device that can be used to carry out the chemical spraying method according to the present invention. FIG. 4 is a diagram showing the relationship between the orifice diameter of the foam gun and the air flow rate. FIG. 5 is a diagram showing the relationship between the orifice diameter of the foam gun and the liquid flow rate. FIGS. 6(a), (b), (c), and (d) are diagrams showing the relationship between the orifice diameter of the foam gun and the state of bubbles. In the drawing, 1o... drug tank, 14...
...Foam gun, 16...Pump, 24
...Compressor, 50...Hose, 52.
... Nozzle, 60 ... Pressure cylinder, 64
...Compressor, 72...Foam gun,
82...Hose, 84...Nozzle.

Claims (4)

[Claims] (1) Mix a diluted solution of the drug, foaming base (or foaming agent), and pressurized air to form a mixed solution,
A method of dispersing a chemical agent, which is characterized by spraying while foaming at a rate of 0.00 l/kg. (2) A drug dispersion device that mixes a diluted solution of a drug, a foaming base, and pressurized air to form a mixed solution, and sprays this mixed solution while foaming at a rate of about 5 to 100 l/kg. a drug tank containing a diluent containing a drug and a foaming base; a means for supplying pressurized air; and a device connected between the drug tank and the pressurized air supply means; a foaming means for mixing and foaming the liquid with pressurized air from a pressurized air supply means, a pump for feeding the diluted solution from the drug tank to the foaming means, and a discharge outlet connected to the discharge port of the foaming means. and the foaming means mixes the diluted liquid and pressurized air sent thereto to form a mixture of about 5
A chemical dispersion device characterized by foaming into foam at a rate of ~100 l/kg. (3) In the chemical dispersion device according to claim 2, the foaming means is attached to two ends facing each other.
A drug dispensing device characterized in that it consists of a T-shaped pipe member having two orifices and one outlet. (4) In the chemical dispersion device according to claim 2, the discharge means is connected to the discharge port of the foaming means.
A chemical spraying device comprising a 0-40 meter hose and a nozzle connected to the opposite end of the hose.