JPS6358583B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is a transpiration method and a transpiration device for continuously evaporating insecticides, deodorizing agents, aromatics, etc. for any desired period of time. Conventionally, such a transpiration method, as typified by an electric mosquito repellent, involves placing an insecticidal transpiration board, which holds an insecticidal ingredient in a pulp board or the like, on the heating plate of the electric mosquito repellent. A device that heats and evaporates is used. However, in such a transpiration method, the effective time for each sheet is limited to about 10 hours, for example, and the transpiration is not uniform. Moreover, since the insecticidal ingredient remains heated during the transpiration time, for example, 10 hours, it naturally decomposes thermally, and it is very inconvenient that the transpiration plate needs to be replaced if it is to be used continuously for a long time. It is. As an alternative, methods have been proposed that heat the insecticidal liquid itself from inside or outside the container, or that sucks up the insecticidal liquid with a porous wick and heats the porous wick, but none of these have been put into practical use. However, in the former case, the insecticidal liquid is in contact with the heat source for a long time, causing thermal decomposition, and there are also problems such as heating a large amount of chemicals in a preheated state in addition to the chemicals to be evaporated, which requires more heat than necessary. However, the latter has many drawbacks such as thermal decomposition of the chemical and accumulation of polymers in the heated evaporation part of the wick, resulting in clogging, which reduces the amount of insecticidal liquid sucked up and the amount of transpiration. has not been standardized. In addition, in these transpiration methods, it is necessary to heat the entire transpiration plate for 10 hours, or to heat a large amount of chemicals or thick cores, so only a few
Electric mosquito traps that only evaporate mg/hour of insecticide require larger heaters and more power than necessary. The present invention has been made in order to solve the above-mentioned drawbacks, and the present invention is to supply a liquid transpiration agent continuously and pointwise through a capillary to a permeation diffusion material having a surface area approximately equal to that of a heating element of a heating heater. and a transpiration method characterized in that the permeation diffusion material is placed directly on a heating heater and heated to evaporate the transpiration agent supplied thereto; The device includes a flat plate-shaped permeation-diffusion material and a capillary tube for continuously and point-wise supplying a liquid transpiration agent to the permeation-diffusion material, and the permeation-diffusion material is generally connected to the heating element of the heating heater. This relates to a transpiration device characterized by having equal surface areas. In other words, the drug needs to be supplied continuously to the permeation diffusion material, and only the amount necessary for transpiration needs to be supplied pointwise, compared to heating the drug all at once, which naturally requires 10 hours of transpiration. The transpiration surface is small and very little power is sufficient, making it possible to use dry cell batteries, for example, and even dry cell batteries can be used for tens of hours or more.
This is a very useful transpiration method for use in places without power or for portable use. In the present invention, a heating wire such as a nichrome wire, a sheet heater, or a heater using a semiconductor can be used as the heating element, but a positive temperature coefficient thermistor using a semiconductor is particularly advantageous due to its good temperature stability. . This positive temperature coefficient thermistor usually has a diameter of several mm to over 1 cm, and in the insecticidal transpiration plate of an electric mosquito repellent of several centimeters square, heating unevenness occurs on the transpiration plate, but in the present invention A positive temperature coefficient thermistor with a diameter of mm is sufficient, which is particularly advantageous since the power consumption can be significantly reduced. The liquid transpiration agent that can be used in the present invention is:
Various chemicals conventionally used for purposes such as pest control, sterilization, and fragrance can be used. Even if these various drugs themselves are not liquids, they may be solvents such as paraffin hydrocarbons such as n-paraffin and isoparaffin, unsaturated aliphatic hydrocarbon alcohols, etc., which are practically non-toxic, odorless, and have little fire risk. It is sufficient if it is dissolved in liquid and in liquid form. Insecticides such as pyrethroids (common name allethrin and geometric and/or optical isomers of allethrin, pyrethroids with relatively high vapor pressure), repellents such as N,N-diethyl-meta-toluamide, cycloheximide, etc., fungicides such as salicylic acid. , parachloro-meta-xylenol, stimulants such as lemon-based, rose-based, green-based fragrances, and the like. The following are examples of representative drugs. Γdl-3-allyl-2-methylcyclopent-2
-en-4-one-1-yl dl-cis/trans-chrysanthemate (generic name: allethrin, trade name: pinamine, manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as pinamine) Γdl-3-allyl-2-methylcyclo Penta-2
-en-4-one-1-yl d-cis/trans-chrysanthemate (trade name: Pinamin Fuorte, manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as Pinamin Fuorte) Γd-3-allyl-2-methylcyclopenta-2
-en-4-one-1-yl d-trans-
Chrysanthemate (trade name: Equisulin, manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as Ekusurin) Γdl-3-allyl-2-methylcyclopenta-2
-en-4-one-1-yl d-trans-
Chrysantemate (trade name: Bioallethrin,
Γ5-Benzyl-3-furylmethyl d-cis/trans-chrysanthemate (manufactured by Roussel-Uclaf, hereinafter referred to as bioallethrin) Γ3-Phenoxybenzyl d-cis/trans-
Chrysanthemate (hereinafter referred to as smithrin) Γ3-Phenoxybenzyl 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate (hereinafter referred to as permethrin) Γ0,0-dimethyl 0-(2,2 -dichloro)vinylphosphate Γ0,0 dimethyl 0-(3-methyl-4-nitrophenyl)thionophate Γ0,0-dimethyl-S-(1,2-dicarboethoxyethyl)dithiophosphate In the present invention, the above-mentioned drug Various commonly used additives such as potency enhancers, deodorants, fragrances, etc. can be optionally added. Efficacy enhancers include piperonyl butoxide, N-propylisome, sinepirin 222, sinepirin 500, Riesen 384, IBTA, S-421, etc., deodorants include lauric acid methacrylate (LMA), and fragrances. Examples include citral, citronellal, and neutradol. In the present invention, permeation and diffusion materials include natural fibers, animal and plant fibers, regenerated fibers, synthetic fibers such as organic fibers, glass fibers, inorganic fibers such as asbestos, nonwoven fabrics, woven fabrics, natural minerals (perlite, diatomaceous earth, etc.), synthetic minerals ( (alumina, silica, calcium carbonate, etc.), resin foams, ceramic molded plates, and the like. More preferred examples include heat-resistant silicone glass wool and asbestos. Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 shows a cross-sectional view of the apparatus of the present invention, 1 is a heater, 2 is a capillary tube, 3 is a transpiration agent, 4 is a container containing the transpiration agent 3, 5 is a permeation diffusion material, 6, 6'
is an electric wire, 7 is a heating element (PTC), and the transpiration agent 3 is supplied pointwise onto the permeation diffusion material 5 through the capillary tube 2. The diffusion material 5 has the property of allowing the drug 3 to penetrate and spread throughout the diffusion material 5, and the supplied drug 3 evaporates from the surface of the diffusion material 5. be. That is, a uniform transpiration speed is obtained by harmonizing the supply speed of the drug 3 from the capillary tube 2 to the diffusion material 5 and the transpiration speed from the diffusion material 5 heated by the heater 1. That is, this speed varies depending on the type of drug (viscosity, etc.), capillary tube (thickness, etc.), diffusion material (density, area, etc.), and heater (temperature). The better the adhesion between the heater 1 and the diffusion material 5, the lower the heat loss. Also, in this diagram, if the power source is DC (battery), heater 1 and heating element (PTC) 7
There is no need for an insulator between the heating element 7 and the heating element 7, and the heat from the heating element 7 can be transmitted to the diffusion material more efficiently. [Example] Regarding the transpiration method of evaporating allethrin, a heater with a surface temperature of 160°C was used, and silicon glass wool woven fabric with a thickness of 1 mm, 7 mm x 7 mm, and
A solution of 5% pinamine fuorte dissolved in an aliphatic hydrocarbon having a boiling point of 150 to 300°C is used as a transpiration agent and evaporated using the apparatus shown in FIG. Measure the weight of each container every hour to determine the weight loss A (mg/hr). On the other hand, the evaporated gas is collected by suction into a column filled with silica gel, and the silica gel is extracted with chloroform every hour, concentrated, and quantitatively analyzed using a gas chromatograph to determine the amount of transpiration B (mg/hr). Effective volatilization rate % of allethrin=B/A×5/100×100

[Table] As a comparative test, a 20 x 35 x 2.8 mm pulp board was impregnated with 40 mg of pinamin fuorte and 40 mg of piperonyl butoxide, and the same was placed on a heater with a surface temperature of 160°C to determine the transpiration pattern over 10 hours. The location was as follows.

[Table] Also, the total effective volatilization rate was low at 49.25%.
In other words, in the present invention, a heater with an area of 5 x 5 mm = 25 mm ² was sufficient and the effective volatilization rate was excellent, whereas in the comparative example, the heater area was 700 mm ² , which was about 28 times as large, but it was effective. The volatilization rate was low, and the transpiration pattern varied greatly over a 10-hour period. Of course, the difference in the area of the heaters makes the surface temperature the same, so the required power naturally differs greatly.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the device of the present invention, Fig. 2-1
The figure is an enlarged plan view of a part of the heater in Figure 1, and Figure 2-
Figure 2 is a back view of Figure 2-1. In the figure, 1 is a heater, 2 is a capillary tube, 3 is a transpiration agent, 4 is a transpiration agent container, 5... penetration diffusion material, 6, 6'... electric wire to power source, 7... heating element,
8 is a ventilation hole.

Claims (1)

[Claims] 1. A liquid transpiration agent is continuously and point-wise supplied through a capillary tube to a permeation-diffusion material having a surface area approximately equal to the heating element of a heating heater, and the permeation-diffusion material is placed on the heating heater. A transpiration method characterized by directly placing and heating the transpiration agent to evaporate the transpiration agent supplied thereto. 2. It is equipped with a heating heater, a flat permeation-diffusion material placed directly on the heater, and a capillary tube for continuously and point-wise supplying a liquid transpiration agent to the permeation-diffusion material, and the above-mentioned A transpiration device characterized in that the permeation diffusion material has a surface area approximately equal to that of the heating element of the heating heater.