JPH09241108A - Insecticidal pellet and insect control using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an insecticidal pellet that retains excellent insecticidal activity of empenthrin, has no fear of discoloration and deterioration by reaction with a metal, and is easy to use by making a specific resin pellet contain empenthrin in a specific content. SOLUTION: This insecticidal pellet comprises an ethylene-vinyl acetate based resin pellet which contains empenthrin in the range of 0.5-6.0wt.%, preferably 1.5-4.5wt.%, per the whole weight. As the ethylene-vinyl acetate based resin, an ethylene-vinyl acetate copolymer is preferable. From the aspects of volatilization of empenthrin and reduction effect on the reaction between empenthrin and metals, it is particularly preferable to make the weight of one pellet 0.005-0.5g. This insecticidal pellet is filled into a nonwoven fabric bag to gradually release empenthrin through the nonwoven fabric to develop the insecticidal effect. From the aspect of quality, preferable materials for the preferable nonwoven fabric are pulp, polyesters, polypropylene, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of insect repellents containing empentrin.

[0002]

2. Description of the Related Art Various insect repellents are commercially available for controlling insect pests inhabiting households, especially clothing pests such as Iga, Koiga, Himematsu-obushi, Himemaru-katsuobushi. Empentrin has high insecticidal activity, exhibits normal-temperature volatility, and has a sufficient effect of preventing insect damage to clothing pests at a lower dose than conventional p-dichlorobenzene, and is therefore useful as an active ingredient of an insect repellent. is there. However, empentryn has a drawback that it is susceptible to problems such as discoloration or deterioration under the influence of metals (particularly copper compounds), and a preventive measure against it has been earnestly desired. For example, the present applicant has previously developed an insect repellent net (Japanese Patent Laid-Open No. 2-270803) formed by heating and molding a mixture of an ethylene-vinyl acetate resin and empentrin, but the manufacturing process is complicated and versatile. It wasn't something. On the other hand, as the form of the insect repellent containing empentryn, the one in which an insect repellent mat is housed in a plastic case is the mainstream, but it is also required to review the usage form. For example, Japanese Utility Model Laid-Open No. 6-65402 discloses, as a new attempt, a vaporizing agent pack containing a plurality of granular shape-holding bodies obtained by adding and mixing an inorganic powder to a liquid absorbing material and impregnating the vaporizing liquid. However, no consideration has been given to the metal of empentryin, and it cannot be said that it is a satisfactory insect repellent.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides an insect repellent which retains the excellent insecticidal activity of empentrin, is free from the risk of discoloration and alteration due to the reaction with a metal, and is functionally novel.
Specifically, it is made for the purpose of providing an insect repellent pellet and an insect repellent method using the same.

[0004]

[Means for Solving the Problems] In order to solve the above problems, the inventors of the present invention have conducted extensive studies, and as a result, by incorporating empentrin in a specific blending amount into a specific resin pellet, the desired insect repellent pellet was obtained. The present invention has been completed by finding out what can be obtained.

That is, the invention of claim 1 is ethylene-
The present invention relates to an insect-repellent pellet obtained by adding 0.5 to 6.0% by weight of the active ingredient, empentrin, to a vinyl acetate resin pellet.

Examples of the ethylene-vinyl acetate resin used in the present invention include ethylene-vinyl acetate copolymer, ethylene-methyl (meth) acrylate copolymer,
Examples thereof include ethylene-vinyl acetate-methyl (meth) acrylate copolymer. Other types of resins such as polyolefins are unsuitable because they are difficult to adsorb empentrin or do not have a reducing action on the reaction between empentrin and metal.

According to the present invention, the ethylene-vinyl acetate resin pellets contain 0.5 to 6.0% by weight, preferably 1.5 to 0.5% by weight of empentrin based on the total amount.
It is characterized by being compounded in the range of 4.5 wt%.
If it is less than 0.5% by weight, the volatilization amount of empentryin is insufficient and sufficient insect-controlling effect cannot be obtained. On the other hand, if it exceeds 6.0% by weight, reaction with metals, especially copper (copper discoloration) is unavoidable. It does not meet the purpose of the invention.

The insect-repellent pellets of the present invention include, as long as the characteristics of the invention are not impaired, other types of volatile agents, such as pyrethroid insecticides such as allethrin, flamethrin, prarethrin, teframethrin, benfluthrin and fenfluthrin, and fenitrothion. , Organophosphorus insecticides such as dichlorvos, repellents such as safrole, citronellol and diet, bactericides, fungicides, deodorants, fragrances, stabilizers, dyes, and other auxiliaries, if necessary It is also possible to make an excellent multipurpose insect repellent pellet.

According to a second aspect of the invention, in the structure of the first aspect, the ethylene-vinyl acetate resin is ethylene-
A vinyl acetate copolymer is used.

According to the invention of claim 3, in the constitution of claim 1 or 2, from the viewpoint of the volatilization performance of empentrin and the effect of light reaction of empentrin and metal, the weight of each pellet is 0.005. .About.0.5 g.

According to a fourth aspect of the present invention, ethylene-vinyl acetate resin pellets contain 0.5 to 6.0% by weight, preferably 1.5 to 4.5% by weight, of empentrin based on the total amount. The present invention relates to an insect control method of encapsulating insect repellent pellets in a non-woven bag and gradually releasing empentrin from the pellets through the non-woven fabric.

Examples of the material for the non-woven fabric include, but are not limited to, pulp and synthetic fibers (polyester, polypropylene, polyamide, etc.) alone or in any combination. The basis weight of the non-woven fabric is preferably about 10 to 100 g / m ² , but it is also possible to appropriately laminate the air permeability for example. By encapsulating the non-woven fabric having such a structure, it is possible to prevent contact contamination with clothing or the like without sacrificing the volatilization of empentryin so much.

A fifth aspect of the present invention relates to insect-repellent pellets according to the fourth aspect, wherein the ethylene-vinyl acetate resin is an ethylene-vinyl acetate copolymer.

[0014]

According to the invention of claim 1, as the material of the insect-repellent pellet, an ethylene-vinyl acetate resin, which has a moderate adsorbability of empentrin and is less likely to cause copper deterioration of empentrin, is used, and the content of empentrin does not exceed that of empentrin. Since the range is set to satisfy both volatilization efficiency and prevention of copper deterioration, insect-repellent pellets with excellent performance can be obtained. The reason why ethylene-vinyl acetate resin is unlikely to cause copper deterioration specifically unlike polyolefin resin is unknown, but it is presumed that the crystal structure of the resin is involved.

According to the invention of claim 2, as the ethylene-vinyl acetate resin, an ethylene-vinyl acetate copolymer, which is particularly useful in terms of the volatilization efficiency of empentrin and the prevention of copper deterioration, is used. Insect repellent pellets are provided.

According to the third aspect of the present invention, in consideration of the volatilization efficiency of empentrin and the prevention of copper alteration, the weight of each pellet is 0.005 to 0.5 g. Obtainable.

According to the invention of claim 4, the insect repellent pellets of claim 1 are used by being enclosed in a non-woven bag, so that the insect repellent activity and the copper alteration preventing effect are of course easy to use and functional. A novel insect control method is provided.

According to the invention of claim 5, since a particularly useful ethylene-vinyl acetate copolymer is used as the ethylene-vinyl acetate resin, a more practical insect control method is provided.

The insect-repellent pellets of the present invention thus obtained are usually enclosed in a non-woven bag, and are stored in a drawer, a chest of drawers, a clothes box or the like, and pests that live in the home, especially mosquitoes,
It is used to control insect pests such as Koga, Himekatsubusumushi, Himemarutsubusumushimu. The application rate of the insect repellent pellets is not particularly limited, but in order to maintain the insect repellent effect for 6 to 8 months, it is usually applied in a volume of 50 l per drawer.
1-20 g is suitable. Further, it is needless to say that practical functions may be added as needed, such as loading an indicator indicating an end point of use.

[0020]

EXAMPLES Next, the insect repellent pellets and the insect repellent method of the present invention will be described in more detail based on specific examples and test examples.

Embodiment 1 0.01 to 0.03 per piece
An ethylene-vinyl acetate copolymer molded into pellets having a weight of g was impregnated with empentrin at 2.0% of the total amount of the pellets to prepare insect-repellent pellets of the present invention. 5.0 g of these pellets are made of pulp non-woven fabric (the back side is laminated with polyethylene film)
Enclosed in a bag. When these two bags were placed on a wrapping cloth wrapped in a garment with a 50 l capacity and used, a high insect repellent effect was maintained for 8 months, and the tatami paper containing copper was not discolored.

Embodiment 2 FIG. The ethylene-vinyl acetate copolymer was kneaded with 0.3% of the total amount of empentrin and 0.3% of the total amount of the volatile antibacterial agent. Molded into pellets weighing 0.1 g. 4.0 g of the pellets were enclosed in a breathable polyester non-woven bag, and an indicator showing the period of 6 months was further loaded to obtain an insect repellent containing insect repellent pellets of the present invention. When this insect repellent was put into a stuffed clothes case and used, the clothes were not damaged by mussels and hornworms during the indicator display period. In addition, compared to the conventional insect repellent stored in a plastic case, there is less concern that the clothing will be molded and it is easy to use.

Test Example 1. Various insect repellent pellets shown in Table 1 were prepared according to Example 1 and Example 2 and enclosed in a breathable polyester non-woven bag, and the following performance tests were carried out. Table 1 also shows the results. (1) Food damage prevention test Four blankets were laid on a drawer of 50 l capacity, and a non-woven bag containing insect pellets was placed on the blanket. After a predetermined period of time, the non-woven fabric was removed, and instead, a cylindrical cylinder containing 5 burrs was placed, and the condition of feeding damage to the blanket was observed for one week. The results of feeding damage were evaluated according to the following criteria. 〇; No damage at all. Δ: Very slight scratches. ×: Eating damage is observed. (2) Copper Discoloration Test A wrapping paper printed with brass is placed in the 50 l capacity drawer used in the above food damage prevention test, a non-woven bag containing insect repellent pellets is placed on the wrapping paper, and discoloration of the wrapping paper occurs after a predetermined period. Was observed. The results are indicated by symbols 〇, △ and ×.

[0024]

[Table 1]

As a result of the test, the insect-repellent pellets of the present invention showed a high effect of preventing food damage and an effect of preventing copper deterioration, and were excellent in usability. On the other hand, contrasting conventional products,
For example, the one in which the pulp granules are enclosed in a non-woven bag (Control 1) cannot avoid the copper discoloration of empentrin. Further, even when a resin other than the ethylene-vinyl acetate resin is used, or even when the ethylene-vinyl acetate resin is used, if the content of empentrin exceeds 6.0%, the copper deterioration of empentrin cannot be suppressed similarly. It was Further, if the content of empentrin relative to the total amount of ethylene-vinyl acetate resin is less than 0.5%, there is a problem in terms of the effect of preventing food damage. Therefore, the utility of the present invention in which the kind of resin and the content of empentrin are specified is clear. Became.

[0026]

INDUSTRIAL APPLICABILITY The present invention provides an insect repellent pellet which retains the excellent insecticidal activity of empentrin, is free from the risk of discoloration and alteration due to the reaction with metal, and is functionally easy to use, and an insect repellent method using the same. Therefore, its practicality is extremely high.

Claims (5)

[Claims] 1. An ethylene-vinyl acetate resin pellet containing 0.5 to 6.0 of empentrin based on the total amount.
An insect-repellent pellet characterized by being contained in a weight percentage. 2. The insect-repellent pellet according to claim 1, wherein the ethylene-vinyl acetate resin is an ethylene-vinyl acetate copolymer. 3. The weight of each pellet is 0.00
It is 5 to 0.5 g, The claim 1 or 2 characterized by the above-mentioned.
Insect repellent pellet as described. 4. An ethylene-vinyl acetate resin pellet containing 0.5 to 6.0 of empentrin based on the total amount.
A insect repellent method comprising enclosing insect repellent pellets, which are contained in a weight percentage, in a non-woven bag and gradually releasing empentrin from the pellets through the non-woven fabric. 5. The insect control method according to claim 4, wherein the ethylene-vinyl acetate-based resin is an ethylene-vinyl acetate copolymer.