JPS6256121B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an electric mosquito repellent mat that is colored bright green and can almost completely fade at the end of use to clearly indicate the end point. Electric mosquito repellent mats are used by impregnating a base material such as a pulp board with an insecticidal ingredient and then heating it to volatilize the insecticidal ingredient.In this case, the base material is colored with a thermochromic dye. The color of the dye is faded with heating to indicate the degree of volatilization of the insecticidal component and the end point of use. Conventionally, when coloring blue, 1,4-dibutylaminoanthraquinone, Blue No. 403, was used as the dye. For green coloring, copper chlorophyll was used. However, pine using copper chlorophyll may generate a strange odor when heated, so the present inventors colored the white base material using various green pigments as an alternative to copper chlorophyll. Although heating was performed, there were few cases where the color faded within the normal heating time (approximately 10 hours) for electric mosquito repellent mats, and there were many cases where there was almost no change in color or the color faded in a short period of time. In addition, the pine that faded when heated for about 10 hours did not become a bright green color, but instead became a blackish, muddy, and dull green color, which had extremely low commercial value. . For this reason, the present inventors conducted further research on a dye that can color the substrate in a vivid green color, and which also fades almost completely after heating for around 10 hours, clearly indicating the end point of use. The inventors have discovered that the above object can be achieved by using a combination of Green No. 202 and Yellow No. 204, leading to the present invention. The present invention will be explained in more detail below. The present invention is an electric mosquito repellent that uses green No. 202 and yellow No. 204 as the thermochromic pigments in an electric mosquito repellent that is used by impregnating a base material with an insecticidal component that volatilizes when heated and a thermochromic pigment that indicates the end point of use. By using Green No. 202 and Yellow No. 204 in combination, a white substrate can be colored bright green, and both pigments simultaneously fade when heated. Since the color is bleached to almost the original color of the base material, the degree of volatilization of the insecticidal component and the end point of use can be clearly indicated, and moreover, it produces almost no off-odor when heated. In contrast,
If Green No. 202 is used alone, the white base material will be colored in a dull color, and the object of the present invention cannot be achieved. Further, as will be described later, the base material cannot be colored bright green even with the combination of other dyes. In the present invention, Green No. 202 and Yellow No. 204 are used in combination as described above, and the ratio of their combination is 1:5 to 5:1, more preferably 1:2 to 3:1 in terms of weight ratio. It is preferable to do so, and thereby the purpose of the present invention can be certainly achieved. In the present invention, as the insecticidal component, components commonly used in electric mosquito repellent mats can be used. For example, pyrethroid insecticides such as allethrin and flamethrin can be used. In addition, if necessary, volatilization regulators such as piperonyl butoxide (PBO), dibutylhydroxytoluene (B.
The base material can be impregnated with antioxidants such as HT), butylhydroxyanisole, fragrances, etc. In the electric mosquito repellent mat of the present invention, a desired base material such as a pulp board is impregnated with the above-mentioned insecticidal ingredients, and if necessary, a volatilization regulator, an antioxidant, a fragrance, etc., and is also impregnated with Green No. 202 and Yellow No. 204. In this case, these ingredients may be impregnated into the base material in advance, or the base material and the insecticidal solution containing these components may be stored separately, and the user can remove the insecticidal solution from the insecticide solution at the time of use. Alternatively, the base material may be coated with or impregnated with the base material. The electric mosquito repellent mat according to the present invention is used by heating in the same way as conventional mats, and the insecticidal ingredients in the mat volatilize due to heating, and the insecticide is killed by this action. By using Green No. 202 and Yellow No. 204 in combination, the white base material is colored vividly green, and from this bright green color, both pigments fade by heating and the color of the base material is almost completely changed. Since the color is decolored to a certain extent, the degree of residual efficacy of the insecticidal ingredient and the presence or absence of efficacy are clearly displayed, making it easy to determine the end point of use. In addition, the combination of Green No. 202 and Yellow No. 204 has high commercial value because it hardly generates any off-odor when heated and, as mentioned above, can color a white base material in bright green. EXAMPLES Hereinafter, the present invention will be explained in more detail by showing Examples and Comparative Examples. Examples and Comparative Examples An electric mosquito repellent mat was prepared by applying and impregnating a pulp board with an insecticidal stock solution having the formulation shown in Table 1. Next, the greenness of each pine was evaluated, and each pine was heated on a heating plate at 160° C. for 10 hours to evaluate color change and odor. The results are also listed in Table 1. The evaluation criteria are as follows. Greenness ◎ Bright green 〇 Green without dullness △ Slightly dull green × Dull green (blackish, muddy hue) ∨ Change in color that is not green ◎ Completely changes from green to white 〇 Slight color remains Almost complete change △ Slight change × No change in odor ◎ No odor 〇 Almost no odor △ Slight odor × Smell

【table】

[Table] Pinamin Fuorte (manufactured by Sumitomo Chemical) was used as the insecticidal ingredient. From the above results, by using Green No. 202 and Yellow No. 204 in combination, a bright green mosquito repellent pine can be obtained, and this pine has a clear color change when used, making it easy to know the end point of use.
It is also found that there is almost no odor.

Claims (1)

[Claims] 1. In electric mosquito repellent mats impregnated with an insecticidal component that volatilizes when heated and a thermochromic dye that indicates the end point of use, green is used as the thermochromic dye.
An electric mosquito repellent mat characterized by using a combination of No. 202 and yellow No. 204.