JP2920440B2 - Fumigation or fumigant heating devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fumigation or fumigant heating apparatus.

[0002]

2. Description of the Related Art Fumigants and fumigants are composed of combustion gases,
Alternatively, it is widely used as a formulation that emits an insecticide or a bactericide as an aerosol by a gas generated by thermal decomposition of a foaming agent. Conventionally, as a smoker heating device, an igniter projecting from the upper surface of the container, connected to it and placed in a container that contains the smoker, ignites and heats a part of the smoker in the container Smoke-producing compositions have been used. Further, as a heating device for a fumigation agent and a fumigant, a device using a hydrothermal agent such as calcium oxide is also used, and various proposals have been made.

[0003] However, in the case of using a conventional smoking device for igniting a fumigation agent or a heating and heating element, the temperature in a container accommodating the fumigation agent or the fumigant can be quickly and uniformly decomposed. Since the temperature does not reach 200 ° C. to 300 ° C. or higher, there is a problem that the momentum for emitting smoke is weak, and thus the active ingredient is not sufficiently diffused into the room.

[0004] In addition, in the case of a heating agent using calcium oxide or the like, in addition to the above-mentioned problems, the rate of temperature rise after the addition of water is slow. It took several minutes to complete the process, and during this time, there was a problem that the user became uneasy. Further, since the calorific value of calcium oxide is relatively small, in order to raise the temperature to a desired temperature, a large amount of calcium oxide is required, and since calcium oxide has a strong hygroscopic property, it must be contained in an airtight container, There were also problems with economics.

[0005]

The inventors of the present invention have examined the above problems and found that a heating element was directly or in a thickness of 2 mm or less on a fixed area on the bottom surface of a container containing a fumigation agent or fumigant. By contacting via an iron plate and burning the heating element from below, the temperature in the container becomes uniformly 200 ° C. to 300 ° C. or more within a short time after the operation, and as a result, smokes in a short time after the operation, In addition, they found that the smoke was strong and the diffusivity was sufficient, and completed the present invention.

[0006]

SUMMARY OF THE INVENTION Accordingly, the gist of the present invention resides in that a fumigation agent or a fumigant is contained in a metal container having a flat bottom, and is directly in contact with the outer surface of the bottom of the metal container. Alternatively, a metal plate having a thickness of 2 mm or less is placed on the outer surface of the bottom of the metal container, and a heating element formed by pressing and molding ferrosilicon powder and metal oxide is arranged so as to be in contact with the metal plate. The ratio (B / A) of the contact area (B) of the heating element with the bottom of the metal container or the metal plate to the bottom area (A) of the metal container is 0.2 to 0.9. And a fumigation or fumigant heating device comprising an igniter for igniting the heating element beside or below the heating element and a heat insulating agent.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below more specifically with reference to the drawings. FIG. 1 shows, as an example of a heating device for a fumigant or a fumigant, a heating device for a fumigant or a fumigant intended for controlling sanitary pests in a house.

In the present invention, the container 1 containing the fumigation or fumigant is made of metal such as iron or aluminum, and the bottom of the container is formed into a smooth surface. On the upper surface of the container, a smoke outlet 2 for emitting smoke generated from the fumigation agent or fumigant is provided. An inner lid 3 such as a metal porous plate or a plastic film is provided below.

In the present invention, a metal plate having a thickness of 2 mm or less is stacked on the bottom of the container so as to directly contact the bottom of the container 1, and the heating element 4 is arranged so as to contact the metal plate. FIG. 1 illustrates an example in which a metal plate 5 is provided and a heating element is brought into contact with the metal plate 5. As the material of the metal plate, iron, copper, and stainless steel can be used, and those obtained by punching these into a disk shape are preferable.

In the absence of a metal plate, the container is heated most quickly, and as the metal plate is provided and its thickness is increased, the heating rate gradually decreases. If there is a space between the heating element and the bottom of the container, or if the thickness of the metal plate exceeds 2 mm, the heat of the heating element will not be sufficiently transferred to the container, and the fumigation performance of the fumigant or fumigant will be reduced. There's a problem.

In the present invention, the contact area of the heating element with the bottom surface of the container or the metal plate is 0.1 mm with respect to the bottom area of the container 1.
The ratio must be 2 or more and 0.9 or less, preferably 0.4 to 0.8. If it is less than 0.2, sufficient heating of the fumigation agent or fumigant cannot be performed, and if it exceeds 0.9, the temperature in the container rises more than necessary, and thermal decomposition of the active ingredient occurs.

Further, as the heating element 4 used in the present invention, a compression molded product made of ferro silicon powder and metal oxide is used. As the metal oxide, lead red, iron oxide, copper oxide, potassium permanganate, or the like can be used. In order to enhance the ignition sensitivity of the heating element, a mixture of iron powder, copper oxide, barium peroxide and the like in a metal powder of aluminum, boron, iron or the like can be added.

Further, the heating element 4 is provided for the purpose of maintaining the strength of the compressed product or adjusting the combustion temperature.
Inorganic binders such as sodium silicate, or alumina, silicon dioxide, and other inorganic mineral powders can be added as appropriate. The ratio of the ferrosilicon powder to the metal oxide is 100 per 100 parts by weight of the ferrosilicon powder.
To 400 parts by weight, preferably 200 to 300 parts by weight. If the heating element 4 is formed in a columnar shape, it can be easily manufactured.

The heat insulating agent 6 used in the present invention
Are located at the side and bottom of the heating element, and serve to prevent the heat generated by the heating element from being conducted from the side and bottom of the heating element to the outer periphery. As this material, a material having poor heat conductivity and hardly subject to change such as decomposition by heat is preferable, and examples thereof include glass, silica stone, vermiculite, pearlite, stone stone, cement, rock wool and the like. As for the shape, it can be used after being formed into a granular, powder, plate, sheet or dish shape.

As the ignition device used in the present invention, an ignition device 7 composed of a match head medicine composition or an igniter composed of a lighter stone and a file is used.

Further, as the fumigation agent or fumigant 8 used in the present invention, a composition in which a heating element, a binder, an inorganic mineral powder, etc. are added to an insecticide, bactericide or deodorant can be used. The exothermic agent is composed of a composition obtained by adding a saccharide to an inorganic oxidizing agent such as potassium chlorate, potassium nitrate, and ammonium nitrate; azodicarbonamide, and a foaming agent such as oxybisbenzenesulfonium hydrazide;
Nitrocellulose, nitroguanidine and the like can be exemplified, but nitrocellulose and / or azodicarbonamide are most preferred for the heating device of the present invention.

Hereinafter, test examples and comparative examples of the present invention will be described. [Test Example] In Test Examples 1 to 5, 20 g of a composition in which azodicarbonamide was used as a heating agent, an insecticide permethrin 10% by weight as an active ingredient, and an appropriate amount of talc were added to an extender was used. And manufactured. Test example 6
Nos. To 9 were produced in the same manner as in Test Examples 1 to 5, except that nitrocellulose was used as a heating agent. Test example 10
Was prepared in the same manner as in Tests 1 to 5, except that both azodicarbonamide and nitrocellulose were used as exothermic agents. In each of the test examples, as the heating element, a mixture obtained by pressing 30% by weight of ferrosilicon powder, 65% by weight of iron oxide, and 5% by weight of sodium silicate and pressing was used. Also, the contact area B of the heating element with the bottom of the container or the metal plate with respect to the bottom area A of the metal container.
The ratio B / A and the thickness of the metal plate were as shown in Table 1.

In the test of the smoke state, the smoke state of the fumigation agent or the fumigant is observed, and the time from the ignition of the heating element to the start of smoke generation from the smoke agent or the fumigant and the time period during the smoke generation are measured. I went. In Table 1, the case where the former measured value was less than 25 seconds and the latter measured value was 15 seconds or more and less than 45 seconds was indicated as “good”. Further, the diffusivity of the active ingredient was tested as follows. That is, about 10
Slide glasses are placed at four places and four corners near the center of the indoor floor of a tatami mat, and the sample of the test example is used at the center of the room. Next, after closing the room for 2 hours, the active ingredient that settled on the slide glass was quantified using a gas chromatograph,
The amount of sediment on each slide glass was determined. As a measure of the diffusivity of the active ingredient in the room, the ratio of the amount of sedimentation at the corner of the room to the amount of sedimentation at the center of the room was determined. Table 1 shows the ratio of the amount of sedimentation of the active ingredient.

[Table 1]

As a result of the test, in each of Test Examples 1 to 10, the smoke emission state was "good" and the diffusibility was satisfactory.

COMPARATIVE EXAMPLE The method shown in Tests 1 to 10 except that the heating element contact area ratio (B / A) in Test Examples 1 to 10 and the thickness of the metal plate were different as shown in Table 2. Tests were conducted on samples 1 to 6 produced in the same manner as described above and on a commercially available fumigant using calcium oxide as a heating element.

[Table 2]

As a result of the test, when the heating element contact area ratio exceeds 0.9 (Comparative Examples N0.1 to No. 4), rapid explosive smoke is observed, which is dangerous, and the sedimentation of the active ingredient is caused. The absolute amount was about 50% of that of the test example in both the vicinity of the center and the corner of the room. When the heating element contact area ratio was less than 0.2 and when the thickness of the metal plate exceeded 2 mm, the smoking state was "poor" and the ratio of the sedimentation amount of the active ingredient was considerably low. Note that the “smoke state” is “poor” when any of the time until the start of smoking and the time during smoking is out of the range of the “good” smoke state defined in the examples.

[0022]

According to the present invention, a heating element is brought into contact with a fixed area of the bottom surface of a container containing a fumigation agent or a fumigant directly or via a metal plate having a thickness of 2 mm or less. Since the heating element is burned from underneath, the temperature in the container becomes uniform within 200 hours within a short time after the operation.
It will be 300 ° C or higher. As a result, smoke is generated in a short time after the operation, and the smoke is strong, and can be diffused more widely in a shorter time.

In addition, since calcium oxide is not used as a heating element as in the prior art, it is economically cheap.

Furthermore, by using this heating apparatus, even if the amount of the exothermic agent such as nitrocellulose or azodicarbonamide in the fumigation agent or fumigant is smaller than the conventionally used amount, It is possible to obtain a preferable smoking performance equal to or higher than that of the above. In particular, the larger the ratio of the contact area of the heating element to the bottom of the container or the metal plate with respect to the bottom area of the container in the range of 0.2 or more and 0.9 or less, the less the amount of the exothermic agent required, and When the ratio is reduced, it is possible to adjust to a preferable smoking performance by slightly increasing the blending amount.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal container 2 Smoke vent 3 Inner lid 4 Heating element 5 Metal plate 6 Insulating agent 7 Ignition tool 8 Smoke or fumigant

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-212403 (JP, A) JP-A-59-48472 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A01M 1/20

Claims (4)

(57) [Claims] 1. A fumigant or fumigant is contained in a metal container having a smooth bottom, and a metal plate having a thickness of 2 mm or less is directly in contact with the outer surface of the bottom of the metal container. A heating element formed by squeezing ferrosilicon powder and metal oxide is placed on the outer surface so as to be in contact with the metal plate, and the heating element of the heating element with respect to the bottom area (A) of the metal container is arranged. To make the ratio (B / A) of the contact area (B) with the bottom of the metal container or the metal plate (B / A) 0.2 to 0.9 and ignite the heating element beside or below the heating element. A heating device for a fumigant or fumigant, comprising an ignition device and a heat insulator. 2. The apparatus for heating a fumigant or fumigant according to claim 1, wherein the fumigant or fumigant is a composition containing at least one of nitrocellulose and azodicarbonamide. 3. The heating device for a fumigant or fumigant according to claim 1, wherein the heating element has a cylindrical shape. 4. The apparatus for heating a fumigant or fumigant according to claim 1, wherein the igniter is an igniter composed of a igniter composed of a lighter stone and a file or a match head medicine composition.