JPS6318562B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a heating evaporation plate. A heating evaporation plate is a so-called insecticide that is used for purposes such as killing insects by evaporating chemicals by placing it on an electrically heated heating plate, as typified by an electric mosquito repellent. Conventionally, it has been manufactured by coating and impregnating a heating transpiration type chemical in the form of a solvent solution onto a hot material such as a fiberboard whose main ingredient is pulp or asbestos, followed by drying. However, while the base material such as the above-mentioned fiberboard is required to have heat resistance and the ability to impregnate and retain a large amount of chemicals uniformly, it is necessary to ensure that the impregnated chemicals do not remain in the mat when heated with a hot plate or the like. Requires properties that allow for effective evaporation of drugs.
However, the known so-called insecticidal pine cannot solve the problem of persistence, especially in order to effectively evaporate the impregnating agent, which has been a major drawback. The present invention has been made for the purpose of eliminating the above-mentioned drawbacks of the conventional art. Namely, the present invention is a heating evaporation plate for controlling insect pests by evaporating chemicals by heating. The present invention relates to a heating evaporation plate containing a fibrous material having substantially non-adsorption properties, and a method for evaporating a drug by placing the evaporation plate on a hot plate and heating it. As mentioned above, the heating evaporation plate of the present invention contains a non-adsorbent substance in the evaporation plate, thereby preventing the contained drug from remaining in the transpiration plate and significantly increasing the transpiration efficiency of the drug. It is possible to improve the thermal decomposition rate and reduce the residual rate. In the present invention, the base material for the heating evaporation plate can be any of the various materials commonly used for this type of heating evaporation plate. Examples include natural fibers, animal and plant fibers, regenerated fibers, synthetic fibers such as organic fibers, glass fibers, paper made of inorganic fibers such as asbestos, nonwoven fabrics, woven fabrics, natural minerals (perlite, diatomaceous earth, etc.), synthetic minerals (alumina), etc. , silica, calcium carbonate, etc.), resin foams, ceramic molded plates, and the like. It is important that the heating evaporation plate has a thickness in the range of 0.5 to 10 mm; if it is thinner than 0.5 mm, it is not preferable because it naturally limits the amount of drug held per unit area. Furthermore, if the thickness exceeds 10 mm, heat transfer in the thickness direction becomes insufficient, making it difficult to evaporate the chemical well. Although the area of the heating evaporation plate is not particularly limited, it is preferably about 1 to 100 cm ² for a normal electric mosquito repellent, for example. 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 pyrethroids (common name allethrin) and several and/or optical isomers of allethrin, pyrethroids with relatively high vapor pressure, repellents such as N,N-diethyl-mettatoluamide,
Examples include cycloheximide, insecticides such as salicylic acid, parachloro-meta-xylenol, and flavoring agents such as lemon, rose, and green fragrances. The following are examples of representative drugs. Γ3-allyl-2-methylcyclopent-2-en-4-one-1-yl d-cis/trans-
Chrysanthemate (hereinafter referred to as pinamine fuorte) Γ5-benzyl-3-furylmethyl d-cis/trans-chrysanthemate (hereinafter referred to as chrylonfurte) Γ3-Phenoxybenzyl d-cis/trans-
Chrysanthemate (hereinafter referred to as smithrin) Γ3-Phenoxybenzyl 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate (hereinafter referred to as permethrin) Γ0,0-dimethyl0-(2,2 -dichloro)vinyl phosphate (hereinafter referred to as DDVP) Γ0,0-dimethyl 0-(3-methyl-4-nitrophenyl)thionophate (hereinafter referred to as Sumithion) Γ0,0-dimethyl-S-(1,2-dicarboethoxyethyl ) Dithiophosphate (hereinafter referred to as Marathon) In the present invention, various commonly used additives such as potency enhancers, deodorants, fragrances, etc. can be optionally added to the above-mentioned drug. Efficacy enhancers include piperonyl butoxide, N-bropylisome, sinepirin 222, sinepirin 500, Riesen 384, IBTA, S-421, etc., deodorants include lauric acid methacrylate (LMA), and fragrances include Examples include citral, citronellal, and neutradol. The above-mentioned heat-evaporation type drug can be retained on the heat-evaporation plate substrate at any time prior to, simultaneously with, or after the formation of the non-adsorptive substance, which will be described later. As the holding method, various conventional methods such as impregnation method, drip method, spray method, printing method, dipping method, kneading method, etc. can be applied. Preferably, the drug is dissolved in an organic solvent such as petroleum ether or n-hexane in an amount of about 10 times the weight of the drug, along with various additives if necessary, and this solution is impregnated into the above-mentioned base to saturation. Any method may be used in which the solvent is removed by drying. The amount of the drug impregnated into the base material may be arbitrarily determined depending on the purpose of use of the heated evaporation plate obtained up to the saturated amount of impregnation, and is usually preferably set to 1/2 or less of the saturated amount of impregnation. The non-adsorptive substances used in the present invention include:
Any fibrous material having substantially non-adsorption properties may be used, such as organic fibers such as synthetic fibers or inorganic fibers such as glass fibers. The synthetic fibers include acrylic, acetate, cellophane, polyester, nylon, viscol rayon, vinylidene, vinylon, polytetrafluoroethylene, promics, benzoate, polyurethane, polyethylene, polyvinyl chloride, polyclar, polynosic, polypropylene, etc. These synthetic fibers can be used with advantage as well in the form of blends of two or more. The usage forms of the above-mentioned non-adsorbable substances include fibrous,
It can be used in the form of powder, granules, lines, strips, etc. The content of the above-mentioned non-adsorptive substance is limited to 40% of the base material, and usually 5 to 30% is preferable.If it exceeds 40%, the heated evaporation plate of the present invention becomes brittle and loses its shape. Undesirable. The heating evaporation plate of the present invention thus obtained is placed on a hot plate and is generally heated to a temperature at which the drug can be evaporated before use. The heating temperature is not particularly limited, but considering the thermal decomposition properties of the drug and the heat resistance of the base material and non-adsorbable substances, it is usually up to 450°C, preferably 100°C.
It is best to keep the temperature at around 350°C. The heating evaporation plate of the present invention placed on the hot plate is typically heated using a heating wire, a sheet heater, a heater using a semiconductor, etc. as seen in ordinary electric mosquito repellents. For example, substances that generate heat when in contact with water such as calcium oxide, mixtures of iron powder and oxidizing agents, substances that generate heat due to oxidation reactions such as mixtures of sodium sulfide and iron carbide and/or carbon black, alcohol lamps and gases. It is also possible to use a burner or the like as a heat source using hot air. The heating evaporation plate of the present invention can be used extremely effectively for exterminating so-called sanitary pests such as mosquitoes, cockroaches, mites, lice, fleas, and bed bugs, and for exterminating agricultural and horticultural pests in greenhouses, etc., and can also be used as an air freshener, throat inhaler, etc. It can also be used as a skin spray. Examples will be given below to explain the present invention in more detail. Example 1 A non-adsorptive substance was mixed into an aqueous solution of a pine paper base material of 80% linter and 20% rayon pulp as a base material for a heating evaporation plate, and the paper was made and dried to form a sheet of 2.2 cm.
After processing into a size of 3.5 cm x 0.20 cm, the base material is impregnated with 90 mg of allethrin, 40 mg of pinamin fluorte, or the like with 40 mg of piperonyl butoxide (PB) added thereto to form the heat evaporation plate of the present invention. Manufacture. Table 1 below shows the types of chemicals and non-adsorbable substances used and their contents. For comparison, Table 1 also shows a comparison transpiration plate that does not contain a non-adsorptive substance. (Assume the size is the same.)

[Table] In Table 1, the content of non-adsorbed substances indicates the ratio when the transpiration plate base material is taken as 100. later 4th
The same applies to the content rates shown in the table. Each sample obtained shall be subjected to the following tests and procedures. <Test> The above sample was electrically heated to a surface temperature of 164~
Hot plate (made of stainless steel) maintained at 168℃
This is placed in a glass cylinder with a diameter of 20 cm and a height of 20 cm, the top is sealed with a glass plate, and heated for 9 hours. The effective volatilization rate of the chemical is determined as follows. That is, after being placed on a hot plate, at predetermined intervals, the drug components floating inside the cylinder are allowed to cool and are pseudo-adsorbed onto the wall surface, the cylinder is washed with petroleum ether, and the resulting ether layer is subjected to gas chromatography. The effective volatilization amount (Bmg) of the drug per hour is determined. The effective volatilization rate (%) is calculated using the following formula, assuming that the amount of chemical impregnated in the heating evaporation plate before the test is Amg. Effective volatilization rate (%)=B/A×100 The results are shown in Table 2. Further, after 9 hours have elapsed, the amount (Cmg) of the insecticidal component remaining in the sample heating evaporation plate is measured and the residual rate (C/A x 100) is determined. The residual rates (%) thus determined are also listed in Table 2.

[Table] From Table 2 above, it is clear that according to the heating evaporation plate of the present invention, the effective volatilization rate of the drug per unit time can be greatly improved, and the cumulative volatilization rate can be significantly improved. <Test> Each of the heating evaporation plate sample No. 5 of the present invention and comparative sample No. b was inserted into a commercially available electric mosquito repellent in the center of a 6-tatami room and heated at a temperature of 172 to 176°C for 120 minutes. On the other hand, Saran mesh baskets measuring 24 x 24 x 24 cm were hung at a height of 1.3 m from the floor in the four corners of the above room, 30 adult Culex mosquitoes were released into each cage, and the number of knockdowns of the adult mosquitoes at a given time was calculated. Count. Test at temperature 25-27
℃ and keep the humidity around 70% RH. The results are shown in Table 3 below as a percentage of the number of knockdowns to the total number of tested insects.

[Table] KT50 in Table 3 above indicates the time (minutes) required to knock down half of the test insects. From Table 3, the present invention sample has, compared to the comparative sample,
It is clear that the same insecticidal effect can be achieved in about half the time using the same amount of drug. Example 2 As a base material for a heating evaporation plate, 30% by weight of wood flour and 20% by weight of starch were added to 50% by weight of perlite or diatomaceous earth powder together with a non-adsorptive material (φ40μ length of about 3mm), mixed with water, and then extruded. and dried perlite board and diatomaceous earth board (both 3cm x 5cm x
0.20cm) and then each of the prescribed drugs.
By impregnating 200 mg, samples Nos. 7 to 10 of the present invention listed in Table 4 below are obtained. Table 4 also shows the case where no non-adsorptive substance is mixed.

[Table] The obtained samples were subjected to the same test as in Example 1 except that they were placed on a hot plate whose surface temperature was maintained at 350°C, and the effective volatilization rate after 20 minutes was calculated. demand. The results are shown in Table 5.

【table】

[Table] Similar to Table 1, Table 5 above shows that the samples of the present invention can significantly improve the effective volatilization rate of chemicals. Example 3 Contain glass fiber in the same manner as Example 2
A solution of 2 to 3 g of each of Sumithion, DDVP, and Marathon dissolved in an organic solvent is coated on a 2.2 cm x 3.5 cm x 0.2 cm perlite plate, impregnated, and dried to obtain a sample of the present invention. Each of the samples thus obtained was placed in an electric heating evaporator and heated at 300 to 320°C for 30 minutes in a 20 m ² greenhouse where various vegetables are cultivated.
Approximately 80 to 80% of each of aphids, greenhouse whiteflies, spider mites, and armyworms that grow on vegetables when left overnight
We were able to kill 95% of the insects. Example 4 2.2cm x 3.5cm x 0.135cm as base material for heating evaporation plate
After laminating the polyurethane fibers so that they are sandwiched between two pulp boards, various fragrances, (citrus fruits,
A liquid obtained by dissolving 2 g of flavor essence (containing appropriate amounts of lemon flavor, osmanthus, rose, violet, sandalwood, etc.) in 10 ml of various organic solvents (n-hexane, petroleum ether, etc.) is added to the flavor per evaporation plate. Each as an essence
The evaporation plate of the present invention was obtained by impregnating it to a concentration of 100 and 200 mg. This transpiration plate was effective for adding fragrance indoors.

Claims (1)

[Scope of Claims] 1. A heating evaporation plate for controlling insect pests by evaporating chemicals by heating, the heating evaporation plate containing a fibrous substance having substantially non-adsorption properties. A heating evaporation plate featuring: 2. A heating evaporation plate for controlling insect pests, etc. by evaporating chemicals by heating, the heating evaporation plate containing a fibrous substance having substantially non-adsorption properties, on the heating plate. A method for evaporating a drug, which method comprises placing the drug on and heating it.