JPH026722B2 - - Google Patents

Description

[Detailed description of the invention]

A. 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 and high humidity, does not have an adverse effect on plastics, metals, paints, etc., has low toxicity to the human body, and has an excellent pest control effect. The present invention relates to a pesticidal agent that has good sustainability of its action. B. Conventional technology Traditionally, as insect repellents for fibers such as wool and silk, cypress, naphthalene, paradichlorobenzene, etc. have been commonly used. Among these, paradichlorobenzene has a strong insecticidal effect and is inexpensive. is the most widely used. However, this paradichlorobenzene
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 at high concentrations in a highly airtight environment, it has a characteristic odor and is harmful to the human body. It has the disadvantage that it has an undesirable effect on the polystyrene molded product, and that it alters and deforms the polystyrene molded product when it comes into contact with it. On the other hand, naphthalene and camphor have the disadvantage of low insect repellent efficacy against textile pests. To compensate for this, various synergists have been proposed to enhance the insect repellent efficacy of naphthalene and camphor ( Japanese Patent Publication No. 53-109938,
JP-A-54-101425, JP-A-59-42302, JP-A-59-43445, etc.). However, these crystalline insect repellents made of a combination of naphthalene and a synergist or camphor and a synergist will liquefy if left in a temperature environment of around 40 to 50 degrees Celsius for a long period of time, such as during product storage. Or, if it comes into direct contact with plastic products such as polystyrene, metal foil, etc., it has the disadvantage of altering, deforming, and discoloring these products. C. Problems to be Solved by the Invention The purpose of the present invention is to overcome the drawbacks of these conventional synergists for naphthalene or camphor, to avoid liquefaction even at relatively high temperatures, and to be able to be used in plastics, metals, and paints. It is an object of the present invention to provide a textile pest control agent that does not have any adverse effects on insects, has a long-lasting insect repellent effect, and is highly safe for the human body. D. Means for Solving the Problems As a result of various studies on synergists to be used in combination with naphthalene or camphor, the present inventor found that the combinations of naphthalene and sorbic acid and camphor and sorbic acid could be used for the above purpose. We have found that the invention is compatible, and have completed the present invention based on this knowledge. That is, the present invention provides a textile pest control agent containing a combination of naphthalene and sorbic acid, and camphor and sorbic acid as active ingredients. Sorbic acid (also known as 2,4-hexadienoic acid) used in the textile pest control agent of the present invention has a melting point of 133~
It is a white crystal with a temperature of 134°C and a boiling point of 228°C, almost tasteless, odorless, and poorly soluble in water. Sorbic acid has traditionally been used as a food preservative and anti-mold agent, and the LD50 for oral toxicity in rats is
It is extremely safe at 10.5g/Kg, and will not liquefy even if left alone after being mixed with naphthalene or camphor. Furthermore, the sorbic acid alone does not exhibit any control effect on textile pests, but when combined with naphthalene or camphor, it increases the control action of naphthalene or camphor against textile pests, and exhibits the effect as a synergist. That was completely unexpected. The optimum mixing ratio of sorbic acid to naphthalene or camphor depends on the sealability, size, material, etc. of the container used, but is usually selected in the range of 1 to 30% by weight relative to naphthalene or camphor. Since the vapor pressure of sorbic acid at room temperature is approximately 1/20 that of naphthalene, the content of sorbic acid tends to increase over time. Therefore, if the initial mixing ratio of sorbic acid is too high, only sorbic acid will remain after naphthalene or camphor has completely evaporated, which is undesirable, and if it is too low, the synergistic control effect will not be effectively exhibited. Therefore, the mixing ratio of sorbic acid to naphthalene or camphor is preferably within the above range. E. Effects of the Invention The textile pest control agent of the present invention is a combination of naphthalene or camphor with sorbic acid as a synergist, and has excellent control action and long-lasting effect. It is safe and has low toxicity to the human body. Furthermore, unlike conventional products, it does not liquefy at all even if left in a high humidity environment at 35 to 40 degrees Celsius for a long time, and even if it comes into contact with plastic products such as polystyrene, it will not change in quality or deform. It is an extremely practical textile pest control agent, as it does not cause any color change in metal foil or paint. F. Examples Next, the present invention will be explained in more detail with reference to Examples. Example 1 Insect repellents containing 4% and 20% sorbic acid were prepared by thoroughly mixing sorbic acid powder and naphthalene powder. Take 1g of each of these insect repellents and 1
Place the bottle at the bottom of a wide-mouthed glass bottle, and hang a basket containing 10 burr larvae and a standard wool cloth above it. Next, the wide-mouthed bottle was sealed and kept in a constant temperature and humidity chamber at 30°C and 65% humidity for 5 days, after which the wool was removed and the amount of feeding damage was measured. For comparison, naphthalene alone and sorbic acid alone were also measured in the same way.
The test was repeated three times, and the average value of the amount of feeding damage was calculated. The results are shown in the table below.

[Table] Example 2 An insect repellent was prepared by thoroughly mixing 1 g of sorbic acid powder and 20 g of camphor. The amount of feeding damage was measured using 1 g of this insect repellent in the same manner as in Example 1. The results are shown in Table 2 together with the measurement results of camphor alone for comparison.

[Table] Example 3 1 g of sorbic acid powder and 10 g of naphthalene powder
Take 1 g of each of the insect repellent prepared by mixing 1 g of sorbic acid and 10 g of camphor and place them at the bottom of a wide-mouth glass bottle, and place 10 burr larvae above it. Hang the basket containing the head. Next, the wide-mouth bottle was sealed and left in a constant temperature and humidity chamber at 30°C and 65% humidity for 7 days, after which the basket was removed and the number of dead insects was counted. For comparison, sorbic acid alone, naphthalene alone, and camphor alone were also tested in the same way. The test was repeated three times and the average values are shown in Table 3.

【table】

Claims (1)

[Claims] 1. A textile pest control agent containing a combination of naphthalene or camphor and sorbic acid as an active ingredient. 2. The textile pest control agent according to claim 1, wherein the ratio of naphthalene or camphor to sombic acid is in the range of 100:1 to 100:30 by weight.