JPS6139282B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric mosquito repellent that more clearly displays changes in the efficacy of insecticidal ingredients.

Generally, electric mosquito repellent mats are made by impregnating insecticidal ingredients (allethrin, flamethrin, etc.) into a base material such as a pulp board, and then using an electric mosquito repellent to heat the mixture to 150 to 170℃.
It is heated to evaporate the insecticidal ingredients. The base material also contains a volatilization regulator (piperonyl butoxide, etc.) to volatilize the insecticidal ingredient over a period of 7 to 12 hours, and an antioxidant to prevent the insecticidal ingredient from deteriorating in the product. agent (BHT,
BHA, etc.), as well as fragrances to mask the odor of insecticidal ingredients and volatilization regulators.

Furthermore, unlike mosquito coils, electric mosquito repellents have the disadvantage that the end point of use is not clear, so they are formulated with pigments, and their effectiveness (whether they have insecticidal power or not) is determined by the degree of discoloration. 1,4-dibutylaminoanthraquinone (Japanese Patent Publication No. 46-24277), 1-methylamino-4-orthotolylaminoanthraquinone (Japanese Patent Publication No. 46-24277), 1977-
23939), arylaminoanthraquinone (JP-A-1986-1999)
-133426) have been proposed.

However, in the conventional efficacy change display, as the insecticidal ingredient volatilizes due to heating, the color simply fades gradually (usually from blue to light blue) due to volatilization, decomposition, or migration of the pigment into the interior. It is difficult to know how much fading is effective, especially if you apply one piece of pine for 2 to 3 hours at a time.
When used several times, the efficacy indication is simply a change in the saturation of the same color, so it is difficult to judge the remaining potency, such as how many hours the drug can be used.

The inventor of the present invention conducted various studies to solve the above drawbacks, and found that by coloring a thermochromic dye in combination with pigments of different hues, when used under heating,
The effectiveness of insecticidal ingredients is determined not just by changes in color saturation, but by
The above drawbacks are solved by displaying the change in hue and changing the hue of the electric mosquito repellent as the insecticidal component volatilizes due to heating.

The present invention will be explained in detail below.

The electric mosquito repellent mat of the present invention is a mat in which a base material such as pulp is impregnated with an insecticidal component that volatilizes by heating, and preferably with components such as a volatilization regulator, an antioxidant, and a fragrance. The agent is dyed with a thermochromic dye having a different hue from the base, and a non-thermochromic pigment having a different hue from the base and the thermochromic dye, and the base is dyed with the color of the thermochromic dye. is formed into a mixed color of this and the color of the pigment, and the hue of the mat is sequentially changed from the color of the thermochromic dye or the mixed color of this and the pigment to the color of the pigment by heating.

In this case, as a thermochromic dye, this is 150
Any material can be used as long as it discolors due to volatilization, dispersion, or migration into the interior due to volatilization of insecticidal ingredients when heated to around 170℃.
For example, 1,4-dibutylaminoanthraquinone,
1-methylamino-4-orthotolylaminoanthraquinone, allylaminoanthraquinone, etc. can be used.

Furthermore, as the pigment, inorganic pigments, organic pigments, and lakes can be used. In this case, examples of inorganic pigments include iron yellow oxide, zinc yellow, yellow lead, etc., and examples of organic pigments include tar pigment Dai-iro No. 203, Dai-iro No. 204, etc.
No. 401, tar dye yellow No. 205, No. 401,
Tar dye red No. 203, No. 204, No. 205, etc.
Examples of lakes include tar dye yellow No. 4 aluminum lake, tar dye yellow No. 5 aluminum lake,
Aluminum lake No. 202(1), tar dye orange No. 205 aluminum lake, aluminum lake No. 402, etc. can be used.

The pigment used is of a different hue from the thermochromic dye used, and matte can be made into the desired color by combining these and their concentration.
Although it is possible to create any hue change, it is particularly preferable to use a warm color pigment as the pigment and a cool color pigment as the thermochromic dye because the color change is large and easy to notice. For example, by combining a yellow or orange pigment and a blue thermochromic dye to make blue to green pine, and heating this, the pine changes from yellow to orange as the insecticidal component evaporates due to heating. can be displayed clearly.

In the present invention, as insecticidal components, volatilization regulators, antioxidants, fragrances, etc., components commonly used in electric mosquito repellent mats are used. For example, pyrethroid insecticides such as allethrin and flamethrin, which volatilize by heating, can be used as insecticidal ingredients, piperonyl butoxide (PBO) and the like can be used as volatilization regulators, and dibutylhydroxytoluene ( BHT) and butylhydroxyanisole (BHA) are used.

Next, a method for manufacturing the electric mosquito repellent mat of the present invention will be explained. One method is to mix the insecticidal component, a volatile regulator, an antioxidant, a thermochromic dye, and a pigment, and in some cases, heat the mixture to dissolve the volatile regulator, antioxidant, or thermochromic pigment. , mix well with a stirrer, disperse, and apply to mats (for example, method according to Japanese Patent Application Laid-open No. 52-61229)
do it. In this case, even if this mat is used in an electric mosquito repellent, the pigment will not scatter from the surface of the mat after use, but a binder may be further added to the insecticide stock solution. When using a binder, a binder that is soluble in the insecticidal component, such as ethyl cellulose, may be added to the insecticide stock solution, but if the binder is not soluble, it is necessary to further add a solvent to dissolve the binder. Furthermore, if the pigment is mixed in advance, such as color chips, flash colors, or by conventional kneading method, the pigment can be neatly dispersed in the insecticide stock solution.

Alternatively, it can also be produced by coloring a base material such as a pulp board with a pigment in advance and impregnating or coating it with an insecticide stock solution containing a thermochromic pigment and an insecticidal component. In addition, when coloring a base material such as a pulp board with a pigment, the pigment is dispersed in an appropriate solvent,
It is preferable to color the pulp board using a binder. In this case, a binder suitable for the solvent can be used, but the binder is 150 to 170
It is preferable to use one that is relatively stable even at high temperatures such as ℃. For example, when water is used as a solvent, methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose,
Water-soluble polymer compounds such as polyvinyl alcohol can be suitably used. Further, when an organic solvent is used as the solvent, a binder that is soluble in the solvent, such as ethyl cellulose, hydroxypropyl methyl cellulose, or a synthetic polymer compound, can be used.

The electric mosquito repellent mat according to the present invention is heated and used in the same way as conventional mats, and the insecticidal components in the mat are volatilized by heating, and the insecticide is killed and exterminated by this action. In this case, the mat of the present invention uses a combination of pigments and thermochromic dyes of different hues for the purpose of displaying efficacy, so that the thermochromic dye fades as the insecticidal component evaporates due to heating. As a result, the hue of the pigment becomes clearly visible, so the degree of residual efficacy of the insecticidal component and the presence or absence of efficacy are displayed not simply as a change in saturation, but as a change in hue. That is, in the electric mosquito repellent mat of the present invention, a base material is dyed with a thermochromic pigment having a different hue from the base material, and a non-thermochromic pigment having a different hue from the base material and the thermochromic pigment, respectively. , the base is formed into the color of the thermochromic dye or a mixture of this and the color of the pigment, and the matte is heated to form a pigment from the color of the thermochromic dye or the mixture of this and the color of the pigment. As the heating progresses and the insecticidal ingredients volatilize, the color of the pine changes to a hue different from the initial hue. The remaining amount and the end point of use are clearly displayed, making it very easy for the user to understand.

Next, the present invention will be specifically explained based on Examples.

[Example 1] Tar dye yellow No. 205 (organic pigment) and tar dye yellow No. 5 aluminum lake (lake) were used, and a small amount of each was mixed in a 5% aqueous solution of hydroxypropyl cellulose, and the well-dispersed mixture was made into pulp. It was applied to a board and allowed to air dry. At this time, the color of the pulp board became yellow and skin color, respectively.

Next, approximately 71.6 mg of an insecticide stock solution of the following composition Pinamin Forte (manufactured by Sumitomo Chemical) 20g PBO 4g BHT 4g Ceresplue GN (manufactured by Bayer) 0.64g 28.64g per pine board was applied to these pulp boards. When impregnated, the colors became greenish-blue (Matsuto A) and blue (Matsuto B), respectively.

When these mats A and B were heated for 12 hours using a commercially available electric mosquito repellent, the following hue changes occurred in each case.

Matsuto A Green-blue → Blue-green → Green → Yellow-green → Yellow Matsuto B Blue → Blue with skin tone →
Blueish skin color→skin color As is clear from the above results, in the electric mosquito repellent mat according to the present invention, the hue of the mat changes sequentially as the insecticidal component volatilizes due to heating, and the degree of residual insecticidal component and the usage It is recognized that the end point is clearly displayed.

[Example 2] Approximately 66.3 mg of an insecticide stock solution having the composition shown below was applied to a pulp board per pine and impregnated, resulting in a bluish-green color.

Insecticide stock solution composition Pinamin Fuorte (manufactured by Sumitomo Chemical Co., Ltd.) 50 mg PBO 5 mg BHT 10 mg Tar pigment Yellow No. 205 (organic pigment) 0.8 mg Ceres Blue GN (manufactured by Bayer) 1.0 mg This was used for 12 hours using a commercially available electric mosquito repellent. When heated, the color changed from blue-green to green to yellow-green to yellow.

When yellow iron oxide was used instead of tar dye Yellow No. 205, the color changed from sky blue to cream color.

[Example 3] Insecticide stock solution composition Pinamin Fuorte (manufactured by Sumitomo Chemical) 50 mg PBO 5 mg BHT 10 mg Ethyl cellulose (manufactured by Hercules) 1 mg Tar pigment Yellow No. 205 0.8 mg Ceres Blue GN (manufactured by Bayer) 1.0 mg Above When pine was coated with 67.8 mg of the insecticide stock solution and impregnated with it and heated in the same manner as in Example 2, Example 2
It changed in the same way as Matsuto.

Claims (1)

[Claims] 1. In an electric mosquito repellent in which a base is impregnated with an insecticidal component that volatilizes when heated, the base is impregnated with a thermochromic pigment having a different hue from the base, and the base and the thermochromic pigment each have a different hue from each other. The matte is dyed with a non-thermochromic pigment, the base is formed into the color of the thermochromic pigment or a mixed color of this and the color of the pigment, and the mat is dyed with the color of the thermochromic pigment or this by heating. An electric mosquito repellent mat characterized in that the hue changes sequentially from a mixed color of the color and the color of the pigment to the color of the pigment.