JPH0769820A - Thermally transpiring article and method for thermally transpring - Google Patents

Abstract

(57) [Summary] [Structure] A heat evaporating body in which a pyrethroid compound is contained in a hollow portion of a synthetic resin hollow body. [Effect] According to the present invention, a certain amount of the insecticidal active ingredient can be evaporated from the wall surface of the hollow body made of synthetic resin without the need for a porous liquid absorbent core, a solvent and the like. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating vaporizer for controlling harmful insects by heating and evaporating an insecticidal active substance, particularly a pyrethroid compound, and a method for heating and evaporating a pyrethroid compound using the same.

[0002]

2. Description of the Related Art As a method of heat evaporation of insecticidal active ingredients,
In a pesticide solution diluted with a solvent of a pyrethroid compound, a part of the porous liquid absorbent core is dipped to absorb the pesticidal solution, and the upper part of the core is heated to absorb the insecticide. A method of evaporating a liquid is known. However, in this method, since the volatility of the solvent and the insecticidal active ingredient in the insecticidal liquid is different, the insecticidal active ingredient is concentrated as the porous absorbent core is used for a long period of time, and thus the high viscosity pyrethroid compound is There is a problem that it becomes difficult to absorb the liquid, or the porous liquid absorbent core is clogged, so that the transpiration amount of the insecticidal active ingredient decreases.

[0003]

DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted extensive studies to solve the above-mentioned problems, and as a result, heat vaporization in which a hollow portion of a synthetic resin contains a pyrethroid compound in the hollow portion. The present inventors have found that the use of a body allows a certain amount of pyrethroid compound to evaporate over a long period of time without the need for a porous liquid absorbent core or a solvent, and has reached the present invention.

[0004]

Means for Solving the Problems That is, according to the present invention, a heating vaporizer comprising a pyrethroid compound in the hollow part of a synthetic resin hollow body and a synthetic resin wall surface by heating the vaporizer The present invention provides a method for heating and evaporating a pyrethroid compound, which comprises evaporating the pyrethroid compound.

The present invention will be described in detail below. The heat evaporative body of the present invention comprises a pyrethroid compound in the hollow part of a hollow body made of synthetic resin, and evaporates the pyrethroid compound dissolved and diffused in the heated synthetic resin wall from the outer surface layer. It is a thing. The hollow body made of a synthetic resin that constitutes the heat vaporization body of the present invention has a structure in which at least one end thereof is closed, and has a structure in which the pyrethroid compound can be stored and held in the hollow portion. Anything will do. Therefore, the hollow body of the present invention may have a sealed tube structure, or may not have a completely sealed tube structure having a partial opening. Regarding the thickness and surface area of the synthetic resin layer of the heating evaporation portion of the hollow synthetic resin wall in which the evaporation of the pyrethroid compound occurs, of the structure of the heating evaporation material, generally, the thinner the wall thickness,
Further, since the transpiration rate of the pyrethroid-based compound tends to increase as the surface area increases, it may be appropriately selected and designed according to the amount of the pyrethroid-based compound to be used and the transpiration rate of interest, and the others can be arbitrarily designed, As a specific example of the shape, the pipe-like shape of FIG. 1 is illustrated, and the cross-sectional shape thereof may be, for example, circular, triangular, quadrangular, hexagonal, star-shaped, corrugated or the like, and is not particularly limited.
Further, it may have a shape (illustrated in FIG. 2) so that a core rod for fixing the pipe can be inserted. Further, in order to make it easy to add the pyrethroid compound, for example, an inlet, an air vent, an enclosure may be provided.

The hollow body made of synthetic resin may be integrally molded by a usual molding method such as extrusion molding, pultrusion molding, profile extrusion, blow molding, vacuum molding, injection molding, or the like.
If necessary, a synthetic resin molded body may be used in which members are arranged to form a hollow body structure. Next, these synthetic resins and members will be described. The hollow synthetic resin is one in which a pyrethroid compound can be dissolved and diffused in the resin matrix, and an amount of pyrethroid capable of controlling pests from a wall surface continuously heated to a transpiration temperature of usually 70 to 180 ° C. Any synthetic resin can be used as long as it can vaporize the system compound and has a heat-resistant temperature to the extent that it does not melt and deform significantly within a desired vaporization time.
Specific examples of such synthetic resin include organosiloxane which is a silicone resin, a copolymer of organosiloxane and an organic polymer, a block polymer or a prop copolymer, and further, silicone rubber, silicone elastic rubber. , Teflon resin, thermoplastic fluororubber, acrylic resin, polyether sulfone resin, polypropylene, poly-4-methylpentene-
Examples thereof include polyolefin resins such as 1 and thermoplastic resins such as polycarbonate resins. These members used in combination with these synthetic resin molded bodies may be those that do not melt and deform by heating to near the evaporation temperature of the pyrethroid compound, as long as they do not allow the compound to permeate more than necessary, for example, synthetic resin For this purpose, a molded article of any of the following compositions or a synthetic resin thereof can be used for this purpose, and an elastic binder such as a silicone sealant and an inorganic composition can also be used. In addition to this, as a member,
A metal thin body such as an aluminum thin body or a metal molded body is exemplified, and the shape thereof is not particularly limited as long as the object of the present invention is not impaired. A pyrethroid compound is added after or during the production of such a hollow body to produce a heat-evaporated body.

The heating vaporizer may be heated either indirectly or directly by heating a part or the whole thereof, but in general, it is indirectly heated in consideration of the thermal stability of the pyrethroid compound which is an insecticidal active ingredient. How to do it.
At the time of heating, the resin wall surface of the portion where the pyrethroid compound is stored in the hollow body is preferably heated, and by this method, a stable transpiration amount can be obtained for a long period of time. The heating temperature depends on the compound to be evaporated, but a preferable temperature between 70 and 180 ° C. is selected. Specifically, for example, in the case of a pipe-shaped heating vaporizer, it may be used upright as illustrated in FIG. 1, or it may be laid down and the lower part thereof may be heated for use. May be heated entirely.

In the vaporizer of the present invention, pyrethroid compounds are preferably used, and if these compounds are vaporized in an amount sufficient to exert a sufficient insect-repellent effect by heating at a temperature lower than their decomposition temperature. Of course, the kind is not particularly limited, but for example, at least one compound selected from the group consisting of allethrin, d-allethrin, dd-allethrin and prarethulin can be used. Further, within the range that does not impair the object of the present invention,
Antibacterial and antifungal agents, deodorants, fragrances, heat stabilizers, antioxidants, ultraviolet absorbers, light stabilizers, fillers, fragrances, solvents and the like can be appropriately mixed and used.

The pests which can be controlled by the method of heating and evaporating the pyrethroid compound are spiders,
Examples include arthropods such as ticks and insects. A further example will be described below. In the arachnid, for example, Triticum mites belonging to the order Acarina, citrus red mite,
Examples include spiders belonging to the true spider order (Araneae), such as the diamondback moth, Dermatophagoides farinae, and the Japanese spider. In the labiapoda,
For example, Gejia and the like belonging to the order of Scutigeromorpha, and Issun centipede and the like belonging to the order of Lithobiomorpha. In a double-legged rope, for example,
Examples include millipede, red millipede, and the like belonging to lydesmoidea). Examples of insect orders include the following. Yamatosimi, which belongs to the order Thysanura, etc., which belongs to the order Orthoptera, horsetail, kerato, emmacogi, locust, grasshoppers, grasshoppers, locusts, etc. , Black cockroaches, American cockroaches, American cockroaches, etc., belonging to the order Termites (Isoptera),
House termites, American termites, etc. such as Psocoptera, Psocoptera, Hiratachatate, etc., Halices (Mallophaga), dog lice, cats, lice, etc. Hemiptera), such as the brown planthopper, leafhopper, whitefly, white aphid, green peach aphid, bedbug, stag beetle, Coleopte
ra) which belongs to the genus Beetle, stilt beetle, weevil, stag beetle, stag beetle, beetle, beetle, etc. , Drosophila, Musca domestica, Drosophila melanogaster, Flies, Tsetse flies, Umea flies, Hirata flies, Hymenoptera
) Belonging to), wasps, paper wasps, pine bees, wasps, black wasps, black wasps, etc.

[0010]

The present invention will now be described with reference to examples, but these examples are merely illustrative and the present invention is not limited thereto. Example 1 A silicone tube (inner diameter: 5 mm, outer diameter: 7 mm, length: 10 cm) whose one end (lower end) was closed with a silicone sealant was added with 5 g of (S) -2-methyl-4-oxo-3- (as an insecticidal active ingredient). After injecting 2-propynyl) cyclopent-2-enyl (1R) -cis and trans-chrysanthemate (praresulin), the upper end was closed with aluminum foil and set in a heating evaporator as shown in the drawing. The heating evaporator was energized to heat the heating element to 120 ° C., and the amount of transpiration of Praresulin was measured 20, 40, 60, 80, and 100 hours after the start of energization. The results are shown in Table 1.

Example 2 A silicone tube (inner diameter: 3 mm, outer diameter: 5 mm, length: 10 cm) whose one end (lower end) was closed with a silicone sealant was used as an insecticidal active ingredient in an amount of 3 g of (S) -2-methyl-4-oxo-. After injecting 3- (2-propynyl) cyclopent-2-enyl (1R) -cis and trans-chrysanthemate (praresulin), the upper end was closed with aluminum foil, and the heating evaporator was set as shown in the drawing. The heating evaporator was energized to heat the heating element to 120 ° C., and the amount of transpiration of Praresulin was measured 20, 40, 60, 80, and 100 hours after the start of energization. The results are shown in Table 1.

[0012]

According to the present invention, a certain amount of the insecticidal active ingredient can be evaporated from the wall surface of the hollow body for a long time without the need for a porous liquid absorbent core, a solvent or the like.

[0013]

[Table 1]

[0014]

[Brief description of drawings]

FIG. 1 is a sectional view of a heating vaporizer and a heating vaporizer, showing a heating vaporizer having a pipe shape set in a heating vaporizer having a heating element.

FIG. 2 is a sectional view of a heating vaporizer and a heating vaporizer, showing a heating vaporizer having a pipe-like shape having a hollow portion into which a core rod can be inserted and set in a heating vaporizer having a heating element.

[Explanation of symbols]

 Reference numeral 1 represents a cylindrical heating element. 2 represents the filled pyrethroid compound. Reference numeral 3 denotes a synthetic resin hollow pipe.

Claims (4)

[Claims] 1. A heat evaporating body in which a pyrethroid compound is contained in the hollow portion of a hollow body made of a synthetic resin. 2. A pyrethroid compound is allethrin, d
-The heat vaporizer according to claim 1, which is at least one compound selected from the group consisting of allethrin, dd-allethrin, and plaresulin. 3. A synthetic resin wall of a heating vaporizer comprising a pyrethroid compound in the hollow part of the synthetic resin is heated to 70 to 180 ° C. to evaporate the pyrethroid compound from the synthetic resin wall. A heating evaporation method, which is characterized in that 4. A pyrethroid compound is allethrin, d
-The heat evaporation method according to claim 3, which is at least one compound selected from the group consisting of allethrin, dd-allethrin, and plaresulin.