JPS6346041B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a control agent for textile pests. More specifically, the present invention is stable even at relatively high temperatures, does not have an adverse effect on plastics, metals, paints, etc., has low toxicity to the human body, and has excellent anti-feeding effects. The present invention also relates to a textile pest control agent that has good sustainability of action. BACKGROUND ART Conventionally, p-dichlorobenzene has been widely used as an insect repellent for clothing because it has a strong insecticidal effect and is inexpensive. However, this p-dichlorobenzene
It is an organochlorine-based chemical with a high vapor pressure, and has strong insecticidal power against textile pests at saturated concentrations, but when used in large quantities and at high concentrations in a highly airtight environment, it produces a characteristic odor and It has the disadvantage that it has an unfavorable effect on the human body, and when it comes into contact with a polystyrene molded product, it alters and deforms the product. On the other hand, camphor is an insect repellent that has been used for a long time and is highly safe, and is in high demand especially as an insect repellent for Japanese clothing. There is a problem that it is lower than chlorobenzene etc. Therefore, various synergists for enhancing the insect repellent efficacy of camphor have been studied. Among these synergists, diphenyl (Japanese Patent Publication No. 59-43445)
and dihydroacetic acid (Japanese Patent Publication No. 59-21841),
Although it is an excellent synergistic insect repellent with a large synergistic insect repellent effect against camphor, the former has a large melting point drop with camphor, and if the two are mixed and left for a long time, it will liquefy even at room temperature, causing contamination. The latter has no problem in terms of liquefaction, but even the high-purity products currently available as industrial chemicals are colored pale yellow and contain α and β-
Due to the presence of unsaturated carbonyl groups, there is a problem of deterioration when stored for a long period of time. Problems to be Solved by the Invention The purpose of the present invention is to overcome the drawbacks of the conventional synergist for camphor, to maintain its effect without liquefying or deteriorating over a long period of time, and to maintain its effect on the human body. An object of the present invention is to provide a textile pest control agent that is highly safe against insects. Means for Solving the Problems As a result of various studies on synergists to be used in combination with camphor, the present inventor found that a combination of camphor and p-hydroxybenzoic acid lower alkyl ester is suitable for the above purpose. I found out that
Based on this knowledge, we have completed the present invention. That is, the present invention provides a textile pest control agent containing a combination of p-hydroxybenzoic acid lower alkyl ester and camphor as an active ingredient. The larger the alkyl group of the p-hydroxybenzoic acid lower alkyl ester used in the textile insect control agent of the present invention, the greater the antibacterial activity, but if the alkyl group becomes too large, the vapor pressure will decrease and the amount of vapor generated will decrease. As the amount of p-hydroxybenzoic acid lower alkyl ester decreases, its effectiveness as a sublimable insect repellent decreases.Also, when isopropyl groups or those with carbon atoms of 4 or more are used in combination with camphor, the mixture tends to liquefy, so they are not recommended as p-hydroxybenzoic acid lower alkyl esters. The methyl, ethyl and n-propyl esters are preferred. These p-hydroxybenzoic acid lower alkyl esters have been conventionally used as food preservatives and antifungal agents, and are compounds that have been confirmed to be safe.They also liquefy even when mixed with camphor and left undisturbed. Never. Furthermore, the lower alkyl ester of p-hydroxybenzoic acid does not show any control effect on textile pests when used alone, but when combined with camphor, it significantly increases the feeding damage inhibiting effect of camphor against textile pests, and serves as a synergist. be effective. However, even when the p-hydroxybenzoic acid lower alkyl ester is combined with naphthalene, the effect as a synergist is not exhibited. Thus, it was completely unexpected that the p-hydroxybenzoic acid lower alkyl ester exerted its synergistic effect only on camphor. The optimal mixing ratio of p-hydroxybenzoic acid lower alkyl ester to camphor depends on the sealability, size, material, etc. of the container used, but it is usually selected in the range of 2 to 50% by weight based on camphor. It will be done. Since the vapor pressure of p-hydroxybenzoic acid lower alkyl ester is lower than that of camphor, the content of p-hydroxybenzoic acid lower alkyl ester tends to increase over time. It is desirable that the amount of initial mixing of the acid lower alkyl ester is small. However, if the amount is too small, the vapor of p-hydroxybenzoic acid lower alkyl ester will not be diffused and will not have sufficient effect on textile pests.
The mixing ratio is preferably within the above range. In addition, p-hydroxybenzoic acid lower alkyl ester may be used alone or as a synergist.
You may use it in combination of more than one kind. Effects of the Invention The textile pest control agent of the present invention combines camphor with at least one selected from p-hydroxybenzoic acid lower alkyl esters, preferably methyl, ethyl, and n-propyl esters as a synergist. It has an excellent feeding inhibitory effect on textile pests, has excellent long-lasting effects, is safe with low toxicity to the human body, and can be left in a mixture for a long period of time. It does not liquefy at all. Furthermore, even when it comes into direct contact with plastic products such as polystyrene, it does not alter or deform them, nor does it change the color tone of metal foil or paint, making it an extremely practical textile pest control agent. Examples Next, the present invention will be explained in more detail with reference to examples. Example 1 A drug was prepared by mixing camphor with 20% by weight of methyl p-hydroxybenzoate. 100 mg of this drug was placed in the bottom of a 500 ml glass bottle, and a basket containing 10 40-day-old burr larvae and wool standard test cloth (2 cm x 2 cm, 40-45 mg) was fixed 5 cm above the bottle. Seal the bottle at 30℃ and humidity 65.
After being left in a constant temperature and humidity room for 7 days, the wool cloth was taken out and the amount of feeding damage was measured. Also, for comparison, camphor alone, p-
Measurements were also made simultaneously for methyl hydroxybenzoate alone, a mixture of naphthalene and methyl p-hydroxybenzoate, and naphthalene alone. The test was repeated five times, and the average value of the amount of feeding damage was determined. The results are shown in Table 1.

[Table] From this table, methyl p-hydroxybenzoate mixed with naphthalene has no anti-feeding effect, but when mixed with camphor, it exhibits a synergistic effect and exhibits an excellent anti-feeding effect. I understand. Example 2 A drug was prepared by mixing camphor with 20% by weight of propyl p-hydroxybenzoate and tested in the same manner as in Example 1. For comparison, propyl p-hydroxybenzoate alone and camphor alone were also measured at the same time. The test was repeated three times, and the average value of the amount of feeding damage was determined. The results are shown in Table 2.

【table】

[Table] Example 3 Drugs were prepared by mixing camphor with 2% by weight, 10% by weight, 20% by weight, and 50% by weight of ethyl p-hydroxybenzoate, respectively, and tested in the same manner as in Example 1. did. For comparison, ethyl p-hydroxybenzoate alone and camphor alone were also measured at the same time. The test was repeated five times, and the average value of the amount of feeding damage was determined. The results are shown in Table 3.

【table】

Claims (1)

[Scope of Claims] 1. A textile pest control agent containing a combination of p-hydroxybenzoic acid lower alkyl ester and camphor as an active ingredient. 2. The textile pest control agent according to claim 1, wherein the ratio of camphor to lower alkyl p-hydroxybenzoic acid is in the range of 100:2 to 100:50 by weight.