JPH11302103A - Thermal fumigation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To thermally fumigate an insecticidal mat and evaporate the fumigant with high persistency for a long period of time with increased retention of efficacy and power saving by heating the surface of the mat, which is the fumigation face of the mat, up to a prescribed temperature. SOLUTION: In a mat (its size preferably measures 1-30 cm<2> and 1-5 mm thickness) that holds 1-90 wt.% of chemicals as insecticidal components, repellent components, aroma components, microbicidal components, mildewproofing agents and the like, the mat is heated so that the temperature of the fumigation surface of the mat may attain 60-110 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for heating and evaporating an insecticide mat capable of continuously evaporating a drug over a long period of about 360 hours.

[0002]

2. Description of the Related Art Insecticidal mats which have been conventionally used lose their effect in about 7 to 8 hours once set in a heating device. Therefore, the mats must be replaced every day in the summer, when they are frequently used. It was troublesome.
For the purpose of reducing such labor, an insecticidal mat which is set once in a heating device and can be used for a certain period of time is being studied. For example,
Japanese Patent No. 35966 discloses a method for sustaining insecticidal efficacy in which an insecticide for collecting electric mosquito containing allesrin as an active ingredient is mixed with sinepirin 500 in an amount of 25 to 100% of the amount of allesrin. It is described that it can be set to 10 hours. Furthermore, in the insecticide mat for heat evaporation containing prarethrin, 0.5
It is known that by mixing 10 to 10 times the amount of sinepirin 500, it is possible to volatilize a certain amount of insecticidal components so as to have sufficient efficacy even when used for a long time, for example, 12 hours.

On the other hand, it has been studied to further extend the use period of the insecticidal mat by means different from these measures. For example, when a drug-containing substance of a solid preparation is stored in a polyamide container and heated and evaporated to about 110 ° C. with a heating element, d-arrestrin and praletrin have 84%. It is known that effective volatilization of time can be obtained. However, even with the above technology, the period during which the drug can be volatilized cannot be said to be sufficient, and there is a problem that it is difficult to obtain an effective amount of volatilization by transferring the drug in the preparation to the storage container. I have.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned drawbacks and to provide a means for continuously volatilizing a drug from an insecticidal mat for a longer period than before. It is in.

[0005]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that by setting the surface temperature of the surface to be the transpiration surface of the insecticidal mat within a specific range, about 360 hours, which could not be achieved conventionally, can be achieved. It has been found that the drug can be volatilized continuously over a long period of time, thereby satisfying the above-mentioned problems, and led to the present invention.

(1) In the insecticidal mat holding the medicine, the surface temperature of the surface of the mat which becomes the evaporation surface of the medicine is 60
A heating and evaporating method, wherein the heating is performed so as to reach 110 ° C.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, several means for controlling the surface temperature of a surface to be a transpiration surface of an insecticidal mat to 60 to 110.degree. C. will be described. A structure in which the substrate is layered,
Examples thereof include a method of providing a buffer layer between the mat base materials, and a method of bringing the mat base material and the heater of the heating device into contact with each other by lines and / or points. To show specific examples of these, in the case of applying a chemical in a thin film form on one surface of the base material or performing printing, etc., the mat base material is made into a plurality of layers, and the uppermost base material For holding the drug on the mat substrate, a metal film or a water-repellent / oil-repellent film is sandwiched between the mat substrates. For example, at least the surface in contact with the heater is provided with irregularities or the like, so that the heater and the mat substrate have dots and / or Line contact.

In addition, the insecticidal mat can be stored in an appropriate container, for example, a heat-resistant container, or held in a container having a structure capable of holding the insecticidal mat in a sandwiched state, and a heater of a heating device and an insecticidal mat. And a method of providing a constant gap between them and adjusting the heat generation temperature of the heater. These methods can be used singly or in combination of two or more such that the surface temperature of the surface to be a transpiration surface of the insecticidal mat is within a predetermined temperature range depending on the situation.

When measuring the surface temperature of the surface which is to be the transpiration surface in the present invention, the temperature near the center of the surface which is not in contact with the heater of the heating device and which has the largest area is usually measured by the thermocouple surface. What is necessary is just to measure with a thermometer. In some cases, the surrounding area or a portion slightly inside the surface of the mat substrate may be measured.

In the present invention, examples of the mat substrate include natural fibers such as linters and pulp; animal and plant fibers such as wool, cotton and silk; regenerated fibers such as rayon; synthetic fibers such as acrylic and polyester: glass and asbestos Paper, nonwoven fabric, graphite, CaCO ₃ , Si obtained from inorganic fibers such as
Inorganic powders such as O ₂ , Al ₂ O ₃ , pearlite, porcelain clay, talc, sepiolite and bentonite: sintered metals: plastic foams such as polyethylene and polyvinylidene fluoride, etc.

The form of the insecticidal mat obtained by these methods is arbitrary, and may be, for example, irregularities, concave portions on both sides, or layers. When a plurality of mat base materials are formed into a layer, the mat base material in contact with the heater of the heating device preferably has a certain degree of thermal conductivity. If a substrate with low thermal conductivity is selected, the heat required for the volatilization of the drug will not reach due to the buffering action of the mat substrate, and the volatilization of the drug will be insufficient, or it will be necessary to raise the temperature of the heater to prevent it It is not preferable in terms of safety and economy.

When a buffer layer is provided, a metal film such as aluminum, a silicone-based or fluorine-based water / oil repellent (material) can be used as the buffer layer. The thickness of the buffer layer is, for example, 0.01 to 1.0 mm, preferably 0.03 to 0.5 mm. These buffer layers have an advantageous effect of uniformly supplying a desired amount of heat to the mat substrate holding the drug, and also have a function of preventing the transfer of the drug to another mat substrate. In addition to this, aluminum may be simply sandwiched between mat substrates.

When the mat substrate is formed into a layer or is combined with another substrate to form a layer, each may be bonded with a binder or the like.
For example, various cellulose derivatives such as carboxymethyl cellulose, gum arabic, polyvinyl alcohol, polyacrylamide-based polymer, polyvinyl methacrylate, polysulfone, polyphenylene sulfide, acrylic resin, polypropylene, polyethylene, ethylene-vinyl acetate copolymer, phenol resin and the like. Can be

The insecticidal mat is usually about 1 to 30 c.
a size of m ^2, as the thickness of the mat base member,
0.5 to 10 mm, preferably 1 to 5 mm is exemplified.

[0015] Examples of the drug include an insecticidal component, a repellent component, an aromatic component, a bactericidal component, an antifungal component and the like. As the insecticidal component, various known compounds can be used, and examples thereof include organic phosphorus compounds, carbamate compounds, and pyrethroid compounds. Of these, pyrethroid compounds are preferable because of high safety. Specific examples thereof include pinamine forte, bioaresulin, extractin, pramethrin, phthalthrine, resmethrin, framethrin, permethrin, phenothrin, fenvalerate, cypermethrin, cyphenothrin, empentrin, terrareslin, etofenprox, transfluthrin, imiprothrin. And the like. Further, these isomers and analogs may be used. The holding amount of these mat substrates is, for example, 1 to 90% by weight.

Other synergists such as sinepirin 500, piperonyl butoxide, octachlorodipropyl ether, 2,6-di-t-butyl-4-methylphenol, stearyl-β- (3,5 -Di-t-butyl-4
-Hydroxylphenyl) propionate, an antioxidant such as 3-t-butyl-4-hydroxyanisole, water,
Solvents such as alcohols, glycols, ethers, and esters, as well as retaining agents, fragrances, and dyes may be appropriately held on the mat base material, and may have an indicator function as necessary.

Means for holding these chemicals on the mat substrate include dropping, coating, dipping, and printing (preferably printing on the surface that becomes the evaporation surface).
The heating method of the present invention is not particularly limited, and the insecticidal mat and the heat source may be in either contact or non-contact state. The heat source that can be used is not particularly limited, but for example, a heating plate or a heater using a resistance heater (such as a nichrome wire) or a semiconductor (PTC) has versatility and is preferable from the viewpoint of safety. Other examples include those using combustion heat of alcohol or gas, those using a catalytic reaction, those using a substance that generates heat upon contact with air and / or water, and those using hot air. Can be used indirectly or indirectly. As these heat sources, those of about 80 to 180 ° C. are preferable.

[0018]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto.

(1) Preparation of an insecticidal mat Example 1 Pulp mat substrate A (22 mm × 35 mm × 3 m
m) and pulp mat base material B (22 mm x 35 mm x
1.8mm) between the aluminum sheet (22mm ×
A mat having a three-layer structure sandwiching (35 mm × 0.08 mm) was prepared. 800 mg of the insecticidal composition is added to the mat base material A.
Was dropped and impregnated to obtain an insecticidal mat. Here, as the insecticidal composition, 300 mg of praretrin was dissolved in an aliphatic solvent that evaporates by heating together with the pigment, and the total amount was 800 m.
g.

Example 2 In Example 1, the size of the mat base material B was changed to (22 mm ×
An insecticidal mat having a size of 35 mm × 1.5 mm) was obtained.

Example 3 In Example 1, the size of the mat base material B was changed to (22 mm ×
An insecticidal mat having a size of 35 mm x 1.3 mm) and an aluminum sheet of (22 mm x 35 mm x 0.3 mm) was obtained.

(2) Volatilization test The insecticidal mats of Examples 1 and 2 were each used as a mat base material B
Was placed in a heating device so as to be in contact with the heater, and was continuously heated so that the surface temperature of the mat substrate A became about 100 ° C. On the 1st, 10th and 31st days from the start of heating, the volatilization amount of praletrin per 12 hours (mg)
Was measured. The measurement of the amount of volatilization was performed by collecting praletrin with a silica gel trap and quantifying the amount by a gas chromatograph. As a result of the test, it was confirmed that praletrin can be volatilized continuously for 31 days. The results are shown in Table 1.

[0023]

[Table 1]

(3) Insecticidal Test Insecticidal tests on Culex pipiens were carried out using the insecticidal mats of Examples 2 and 3 as follows. A heating device was placed at the center of the floor of the 6-tatami living room, and the mat base B of the insecticidal mat of Example 2 was placed so as to be in contact with the heater and heated. Simultaneously with the start of heating, stainless steel gauges containing 15 mosquitoes (female adults) were set at two places at a height of 0.75 m and 1.5 m from the floor, and knockdown of mosquito mosquitoes with elapse of the exposure time of the drug was performed. Observe. The test was also performed on the insecticidal mat of Example 3 in the same manner. As a result of the test, it was confirmed that a sufficient knockdown effect was obtained. The results are shown in Table 2.

[0025]

[Table 2]

[0026]

According to the present invention, it is possible to provide a method for heating and vaporizing an insecticide mat capable of continuously volatilizing a drug over a long period of about 360 hours.

Claims (1)

[Claims] 1. An insecticidal mat holding a drug, wherein the surface temperature of the surface of the mat that is to be a transpiration surface of the drug is 60-11.
A heating and transpiration method characterized by heating to 0 ° C.