JPH10110061A - Pest control molded products - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pest control molded product by adding an insect repellent at the time of melting of a thermoplastic resin, which is excellent in safety, decreases in efficacy due to thermal decomposition, discolors the resin, and has a bad odor during work. Provided is a resin molded product having excellent repellency against pests without generation, change in physical properties of the resin, and the like. SOLUTION: General formula (I) ROOC (CH ₂ ) nCOOR (I) wherein R is a saturated alkyl residue having 1 to 8 carbon atoms, and n is 9
Represents an integer of ~ 18. A pest control molded product obtained by melt-molding a thermoplastic resin composition containing one or more agents selected from dibasic acid saturated dialkyl esters represented by the formula (1).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition in which a dibasic acid-saturated dialkyl ester excellent in safety is blended with a thermoplastic resin. The present invention relates to a resin molded product exhibiting a pest control effect.

[0002]

2. Description of the Related Art As a method for controlling pests, the most common method is application of a pesticide. However, there is a problem in the safety of drugs used as insect repellents. In recent years, studies have been conducted on the efficacy and toxicity of this component so as to improve the pest control effect and reduce the harm of this drug as much as possible, and considerable results have been seen. At the beginning of the development of insect repellents, the insecticidal effect was prioritized, so that many insect repellents based on phosphorus compounds were used widely at home.

However, as the use of these insect repellents has spread, their harmfulness has been pointed out, and there has been a demand for low-toxic insect repellents. The combination test reduced the amount of insect repellent used and increased safety. In addition, in the method of using these insect repellents, a method of adding the molten resin to the surface of a resin molded article has been used.

[0004] Since thermoplastic resins are easy to process, their application range is very large as fibers, cotton, films, sheets and other various molded products. In particular, textile products include beddings such as clothes, futons, blankets, sheets, curtains,
In addition to rugs such as upholstery, carpets and tatami mats, they are also used in large amounts as synthetic cotton and cushioning materials. By subjecting these molded products to processing that repels pests such as cockroaches, mites, fleas, and mosquitoes, it is possible to suppress the propagation of pests and prevent damage to pathogenic bacteria. Conventionally, the surface treatment of these resin molded products has been common, but the processed insect repellent is kneaded directly into the resin due to the reduced efficacy due to oxidation, ultraviolet rays, etc., or the falling off of the drug during use. The method began to take place.

[0005] However, problems of the method of adding an insect repellent when the thermoplastic resin is melted include, for example, a reduction in efficacy due to thermal decomposition, coloring of the resin, generation of a bad smell during operation, and change in physical properties of the resin. In particular, when the melting temperature is 200 ° C. or higher, the temperature is easily affected. Many of the insect repellent components have excellent performance in those containing sulfur, nitrogen, phosphorus, and halogen atoms in their structural formulas, but these compounds often have the above-mentioned disadvantages. .
Among these organic compounds, among the aliphatic and aromatic organic acid ester derivatives having excellent heat stability and insect repellency, compounds having insect repellency have been found.

[0006]

The object of the present invention is to provide a pest control molded product by adding an insect repellent when a thermoplastic resin is melted, which is excellent in safety, reduced in efficacy by thermal decomposition, colored resin, It is an object of the present invention to obtain a resin molded product having no bad odor at the time and no change in physical properties of the resin and having excellent repellency against pests.

[0007]

The present inventors have studied the application of saturated dialkyl esters of aliphatic dibasic acids in order to solve the above-mentioned problems, and as a result, have found that oxalic acid, malonic acid, succinic acid, glutaric acid, and the like. Among dibasic acids such as acid, adipic acid, pimelic acid, cornic acid, azelaic acid and sebacic acid, the dialkyl adipate is a known compound, and has the following general formula (I): ROOC (CH ₂ ) nCOOR ··· The carbon number of the alkyl group of a dialkyl ester such as undecandioic acid of n = 9, dodecandioic acid of n = 10, tridecandioic acid of n = 11 and tetradecandioic acid of n = 12 represented by (I) is And 1 to 8 were found to be compounds having excellent insect repellency, and the present invention was completed.

This dibasic acid saturated dialkyl ester is
Excellent solubility in most thermoplastic resins, good thermal stability, almost no thermal decomposition at the time of resin addition,
No hydrolysis of the formed ester is observed. Thermoplastic resin applied to the present invention, polyethylene, polyolefin resin such as polypropylene, polystyrene resin,
In addition to styrene resins such as ABS resin, polyvinyl resins such as vinyl acetate, vinyl chloride and methyl methacrylate, polyamide resins, polyester resins, polyether resins, polycarbonate resins, polyurethane resins and the like can be used.

As an application depending on the composition of the thermoplastic resin, a polyester resin, a polyamide resin, a polyolefin resin, and the like are suitable for films, textiles, cotton, and the like. As a material for pantyhose, polyamide resin is suitable. The dibasic acid saturated dialkyl ester of the insect repellent used in the present invention has 9 to 18 methylene groups. The alkyl group of the fatty acid has 1 to 8 carbon atoms. When the alkyl group is represented, methyl, ethyl, propyl (including normal and iso isomers, the same applies hereinafter), butyl, pentyl, hexyl, heptyl And an octyl group.

The amount of the dibasic acid saturated dialkyl ester to be added to the thermoplastic resin is 0.1 to 10.
0% by weight, preferably 0.3 to 5.0% by weight. In addition, this insect repellent composition further includes an antibacterial agent, a fungicide, another insect repellent, a repellent and an efficacy enhancer, an ultraviolet absorber, an antioxidant, a deodorant, a flavoring agent, a coloring agent. , A surfactant and the like can be used in combination.

In the present invention, n represented by the general formula (I) is 9-1.
A dibasic acid having a carbon number of 1 to 8 and a mixture of one or more dialkyl esters selected from saturated dialkyl esters having 1 to 8 carbon atoms.
1 to 10.0%, preferably 0.3 to 5.0% by weight, the insect repellent has durability, maintains its efficacy for a long time, and has little effect on the resins used. An excellent pest control resin molded product is obtained.

[0012]

The present invention will be described below in more detail with reference to Examples, but the present invention is not limited to these Examples. The insect repellent used in this example is as follows. The percentages shown in the examples are all percentages by weight. Insect repellent compounded resin (1) 6 nylon (trade name: Kanebo Nylon MC112 Kanebo Co., Ltd.) at a heating temperature of 220 to 250 ° C.
Dimethyl dodecane diacid [trade name: DMD-
2 Sanken Kako Co., Ltd. products] 0.1%, 0.3%, 0.
After adding 5% and 1.0%, and kneading, a 30-micron-thick film was trial-produced using an extruded film production tester by Labo Plastomill (Toyo Seiki Seisakusho).

Insect repellent compound resin (2) Low density polyethylene [trade name: Mirason NEO23H
Mitsui Petrochemical Industry Co., Ltd.]
At 0 ° C., 0.1% of tridecandionate methyl [trade name: DMB Sanken Kako Co., Ltd.] was used as an insect repellent,
After adding 0.3%, 0.5%, 1.0% and burying,
Laboplast mills (Toyo Seiki Seisakusho Co., Ltd.) produced 30 μm thick films on an extruded film production tester.

Using the films prepared in (1) and (2) above, a repellency test against Dermatophagoides pteronyssinus was performed. The test method is as follows. Test Method: (1) Prefectural Institute of Technology As shown in FIG. 1, a plastic petri dish 1 having a diameter of 4 cm and a height of 0.6 cm was placed on an adhesive sheet 4, and six identical petri dishes 2 were placed around the plastic petri dish 2 at the center. Place so that the petri dish and the edge are always in contact. Approximately 10,000 surviving mites were placed at the center of the Petri dish 1, and the three Petri dishes surrounding the Petri dish 1 ′ containing the tick culture medium were treated with samples 3 and 4 ′ cut out to a diameter of 4 cm. Alternately, place 0.05 g of powder sample without mite on each sample.
Put this together with the adhesive sheet into a 27 × 13 × 9 plastic container for food preservation, put saturated saline solution and cover it, keep the humidity in the container at about 75%, and store it in a 25 ± 1 ° C. thermostat. And breed it all day and night. On the next day, the powder sample on the sample was collected by a saturated saline suspension method and the sample was collected by a water washing method, and then the mites were counted. The repellent rate was determined by the following formula. The test was repeated three times in consideration of variations.

[0015]

(Equation 1)

(2) Intrusion Prevention Method As shown in FIG. 2, a sample 7 is placed on a plastic petri dish 6 having a diameter of 4 cm and a height of 0.6 cm, and 0.05 g of a powder sample 9 containing no ticks is placed thereon. Put. This is placed at the center of a plastic petri dish 5 having a diameter of 9 cm and a height of 1.5 cm. Between the large and small petri dishes, a well-propagated tick culture medium (approximately 10,000 living mite population) is uniformly spread. Put this on the adhesive sheet 10,
Put the adhesive sheet together with the adhesive sheet into a 27 × 13 × 9 cm plastic container for food preservation, cover with saturated saline solution, keep the humidity in the container at about 75%, and store in a thermostat at 25 ± 1 ° C. Raise them all day and night. On the following day, the powder sample on the sample was collected by a saturated saline suspension method, and the sample was collected by a water washing method, and then the mites were counted.

[0017]

(Equation 2) The test was repeated three times in consideration of variations.

Test of repellency of insecticide-containing resin film against Dermatophagoides pteronyssinus A mite repellency test was conducted by the Fukuiken method using a film experimentally produced with insecticide-containing resin (1). Table 1 shows the test results.
Table 2 shows the test results of the film experimentally produced with the insecticide-containing resin (2) according to the Fueiken method. In addition, Table 3 shows the test results by the intrusion prevention method of the film experimentally produced with the insecticide-containing resin (1), and Table 4 shows the test results by the intrusion inhibition method of the film experimentally produced with the insecticide-containing resin (2).

Results of the Mie repellent test of the Prefectural Institute of Technology

[Table 1]

[0020]

[Table 2]

Results of the Mite Repellent Test of the Intrusion Prevention Method

[Table 3]

[0022]

[Table 4]

[0023]

According to the present invention, a thermoplastic resin is selected from dibasic acid-saturated dialkyl esters of the general formula (I).
By melt-molding a thermoplastic resin composition containing one or more kinds of agents, a resin molded product having excellent repellency against pests can be obtained.

[Brief description of the drawings]

FIG. 1 is a layout diagram of a petri dish used in the Prefectural Institute of Technology in the mite repellent test according to the present invention.

FIG. 2 is a layout view of a petri dish used for an intrusion prevention method in a test for repelling mites according to the present invention.

[Explanation of symbols]

 1 ··· Petri dish 1 '··· Mite medium containing living mites 2 ··· Petri dish 3 ··· Treatment area 3' ··· Untreated area 4 ···· Adhesion Sheet 5: Petri dish (9 cm in diameter) 6: Petri dish (4 cm in diameter) 7: Test specimen 8: Tick culture medium 9: Powder feed 10: ..Adhesive sheets

Claims (1)

[Claims] 1. The following general formula (I): ROOC (CH ₂ ) nCOOR (I) wherein R is a saturated alkyl residue having 1 to 8 carbon atoms, and n is 9
Represents an integer of ~ 18. A pest control molded product obtained by melt-molding a thermoplastic resin composition containing one or more agents selected from dibasic acid saturated dialkyl esters represented by the formula (1).