JPS5935521Y2 - heating evaporation plate - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a heating evaporation plate.

Conventional heating evaporation plates are so-called insecticidal mats that are used for purposes such as killing insects by evaporating chemicals by placing them on an electrically heated hot plate, as typified by electric mosquito repellents. A chemical for heating and evaporation is applied and impregnated in the form of a solvent solution to a base material such as a fiberboard or the like, which is mainly made of bulbs or asbestos.

Various types of such insecticidal mats are already commercially available, and they are all approximately the same in shape and size: 3.5 mm x 22 mm x 3.0 to 3.2 mm (
The drug is impregnated and retained throughout the plate-like base material (thick).

However, since such known insecticidal mats have a relatively thick wall (3.0 to 3.2 mm), it takes time for the chemicals to evaporate after the hot plate is heated, and Since the temperature gradient inside the mat is large, the residual rate of the drug after use is high, reaching, for example, 25 to 30%, making it uneconomical.

In order to solve this problem, the present inventor attempted to make the thickness of the transpiration plate thinner than commercially available products, and although improvements were seen in the transpiration start time and survival rate,
It has been found that this causes a problem in that the transpiration of the drug concentrates in a short period of time after the start of heating, and the duration of the drug's efficacy is extremely reduced.

Therefore, in addition to reducing the thickness of the transpiration plate, the inventor of the present invention found that when a protrusion is formed on at least a part of the peripheral edge of the transpiration surface, transpiration can be started without substantially reducing the duration of the medicinal effect. It was discovered that the problems of time and survival rate could be eliminated, and the present invention was finally completed.

That is, the present invention is a heating evaporation plate that heats and evaporates the drug impregnated throughout the evaporation plate, and the thickness of the evaporation plate is 0.
．． The heating evaporation plate has a diameter of 5 to 2.8 mm and is characterized in that a part or all of the peripheral edge of the evaporation surface of the evaporation plate forms a protrusion.

The heating evaporation plate of the present invention maintains its medicinal efficacy for a long time and can be used as an insecticidal mat without any problems like conventional products.In addition, the transpiration performance in the initial stage of transpiration use is improved, and the specified level can be quickly reached after heating starts. It has the characteristics of being able to exhibit medicinal efficacy, and furthermore, the residual rate of the contained drug is reduced, and the drug can be effectively evaporated and used without wasting it.

In the present invention, the shape and size of the heating evaporation plate are arbitrary, and examples include rectangular, square, triangular, diamond, oval, and circular shapes, and the size depends on the heat source used, such as an electric mosquito repellent. It is decided according to the size of the heat sink.

In the present invention, the protrusion may be formed all around the periphery of the transpiration surface, or may be formed on a part of the periphery of the transpiration surface, and in some cases, for example, it may be formed along two opposing sides. Just do it.

In the present invention, the protrusions of the evaporation plate can be formed by any means, such as preparing a somewhat thick base material for the evaporation plate and forming them by pressing using a mold.

In the present invention, uneven parts can be formed on the transpiration surface other than the protrusions for the purpose of improving the transpiration performance of the drug in the initial stage of transpiration use.

On the contrary, if the purpose is to improve the transpiration performance at the final stage of use, an uneven portion may be provided on the upper surface of the protrusion.

As the chemicals held in the transpiration plate, various chemicals conventionally used for purposes such as pest control, sterilization, and fragrance can be used.

Insecticides such as the pyrethroid, common name allethrin and several 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, etc., and various flavoring agents such as lemon-based, rose-based, and green-based fragrances.

The following are examples of representative drugs.

03-allyl-2-methylcyclopent-2-ene 4-
On-1-yl d-cis/trans-chrysanthemate (hereinafter referred to as pinamine forte) 05-benzyl-
3-furylmethyl d-cis/trans-chrysanthemate (hereinafter referred to as cryuronforte) 03-phenoxybenzyl d-cis/trans-chrysanthemate (hereinafter referred to as smithrin) 03-phenoxybenzyl 3-(2,2-dichlorohinyl) -2,2
-Dimethylcyclopropanecarboxylate (hereinafter referred to as permethrin) ○ Empenthrin (manufactured by Sumitomo Chemical Co., Ltd., trade name: Paper Surin) 00.0-Dimethyl 0-(2,2-dichloro)vinyl phosphate (hereinafter referred to as DDVP) 00. 0-dimethyl 0-(3-methyl-4-nitrophenyl) thionophosphate (hereinafter referred to as sumithion) 0-dimethyl-5-(1,2-dicarboethoxyethyl) dithiophosphate (hereinafter referred to as marathon) In the present invention, the above drugs include commonly used potency enhancers (piperonyl butoxide, sinepyrene 222,
etc.), deodorants (lauric acid methacrylate, etc.), fragrances (
Various additives such as citral, citronellal, etc.) can be optionally added.

In the present invention, examples of the material for the heating evaporation plate include inorganic fibers such as asbestos and rock wool, pulp, and inorganic powder formed into a plate shape.

In the present invention, a thermally conductive sheet or a heat insulating sheet made of aluminum or the like may be attached to the heated surface of the evaporation plate, and the thickness of the heating evaporation plate is 0.5 to 2.8 mm.
Therefore, if the thickness is thinner than 0.5 mm, it is not preferable that the amount of drug held per unit area is naturally limited.

Moreover, if the thickness exceeds 2.8 mm, heat transfer in the thickness direction becomes insufficient, making it difficult to evaporate the chemical well.

The present invention will be described below with reference to drawings showing an example of the implementation of the present invention.

1 to 8 are a plan view A and a sectional view B showing an example of the implementation of the present invention. A case is shown in which a portion 2 is provided around the periphery, and the protrusion portion 2 is provided on the evaporation surface of the evaporation plate 1.

In FIGS. 4 and 5, the projections 2 are provided on both sides of the evaporation plate, and in this case, the projections 2 are also formed only on the evaporation surface side.

6 to 8 show modifications of FIGS. 1 to 3, in which uneven portions 3 are provided on the evaporation surface side of the heating evaporation plate 1. FIGS.

The following is a product of the present invention [as shown in Figures 1 to 8, dimensions: 35m x 22mm x 1.5mm (protrusion 2.8mm)
))], Comparison 1 (wall thickness: 2.8 mm) and Comparison 2 (wall thickness: 1.5 mm), which are the same as the invented product except that it does not have a protrusion, and commercially available 1 ( However, wall thickness: 3
．． 0 mm) and commercially available 2 (however, wall thickness: 3.2 mm),
Table 1 shows the results of comparing the volatilization amount and residual amount using the same commercially available electric mosquito repellent with the same drug content.

In addition, 40 mg of Pinamin Forte (trade name, manufactured by Sumitomo Chemical Industries, Ltd.), which is an optical isomer of allethrin, and 40 mg of piperonyl butoxide were added to 35 mm X
Various samples were prepared by impregnating the entire heated evaporation plate base material made of 22 mm linter pulp, and the surface 150
It was placed on the hot plate of an electric mosquito repellent at °C.

As is clear from Table 1, comparative 1 and 2 and commercially available 1 and 2
The effective volatilization rate in the 9-10 hour period did not reach 6%, which is said to be the limit of mosquitoicidal efficacy, and there was a problem with the durability of the drug's efficacy. The residual rate is as high as 20-30%, resulting in large drug losses.

Furthermore, regarding the effective volatilization rate in the time period of 0 to 1 hour,
Commercially available products 1 and 2 have a content of around 5%, neither of which has reached 6%.

On the other hand, those according to the present invention have a range of 0 to 1.4 to 5 and 9 to 1.
The effective volatilization rate far exceeds 6% in all 10 time periods, and the medicinal efficacy can be sustained for at least 10 hours.

Furthermore, the residual rate is at least 30% higher than that of commercially available 1 and 2.
%, improving economic efficiency.

Furthermore, the effective volatilization rate in the time period of 0 to 1 hour was also 6.
% range, and the desired medicinal effect can be exerted immediately after heating starts.

As described above, in the present invention, the transpiration property and the residual rate can be significantly improved without any decrease in the duration of drug efficacy.

[Brief explanation of the drawing]

1 to 8 are a plan view A and a sectional view B showing different embodiments of the present invention. In the figure, 1 is a transpiration plate, 2 is a protrusion, and 3 is an uneven portion.

Claims (1)

[Scope of utility model registration request] In a heating evaporation plate that heats and evaporates the drug impregnated and retained throughout the transpiration plate, the thickness of the transpiration plate is 0.5 to 2.8.
1. mm, and a part or all of the peripheral edge of the evaporation surface of the evaporation plate is in the form of a protrusion.