JPH0547225A - Ant-preventing cable - Google Patents

Abstract

PURPOSE:To remove the insect damage of a cable and provide insecticidal effect for a long period by providing an ant-preventing layer containing diethyltolamide. CONSTITUTION:An ant-preventing cable 1 has a sheath 5 covering, through a jute 4, the conductors 3 of three cores covered with insulators 2 consisting of polyvinyl chloride, cross-linked polyethylene, or the like. In an ant-preventing layer 6 provided in the sheath 5, diethyltolamide is added to the base material of a cable coating material used in the sheath 5. The diethyltola-mide is formed by porous capsulation or microcapsulation.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an insecticidal effect on termites,
The present invention relates to a termite-proof cable having a high repellent effect and high safety.

[0002]

2. Description of the Related Art Due to the habit of termites, which eat cellulose, to bite everything that interferes with their course within their range of motion, cables coated with plastic such as PVC or polyethylene are also eaten, causing insulation breakdown or damage to the cables. It suffers social damage such as communication interruption. Among such termites, the termites live in regions where the average temperature of one month is 4 ° C. or higher, and the termites live throughout Japan, and the damage of the termites is particularly serious.

As a conventional anti-term control measure, a drin-based drug that has been stable and has an excellent effect for a long period of time has been used, but it may be accumulated in a biological system, and it is difficult to understand. There was a pollution problem.

[0004]

Therefore, organic phosphorus-based agents are used. However, in addition to the problem of stability, many of them cause decomposition at the pressurizing temperature of, for example, about 200 ° C. at the time of processing plastics. In addition to producing odor,
The anti-termite effect has decreased. There has not yet been a drug with low toxicity that is stable and has a high anti-termite effect that does not cause environmental pollution.
Therefore, as a non-pharmaceutical means, a method has been adopted in which nylon is coated with a hard and tough resin such as high-density polyethylene on the outermost layer of the cable to mechanically protect it from termite teeth.

However, the flexibility of the cable is impaired, and if the coating is damaged when the cable is laid, the termites are likely to be damaged.
Moreover, since it is flammable, damage such as fire could not be prevented. In order to solve the above-mentioned drawbacks, the present invention is highly safe, has an insecticidal effect against termites, is heat-resistant so that it does not decompose even when heated during processing, and the termite control effect is retained for a long time. The purpose is to provide a cable.

[0006]

In order to achieve the above object, the termite-proof cable of the present invention comprises a synthetic resin sheath forming the outermost layer of the cable and a termite-proof layer containing diethyltoluamide. .. Furthermore, the diethyltoluamide may be encapsulated in a micul.

[0007]

A sheath made of synthetic resin is provided as the outermost layer of a power cable or the like, and an antitermite layer containing diethyltoluamide is provided on this sheath. The ant-preventive layer may be provided so as to cover the surface of the sheath, or may be provided up to about 50% of the sheath thickness from the surface. Diethyl toluamide has an insecticidal effect on termites, and has a very good anti-termite effect. In addition, it is possible to include diethyltoluamide by encapsulating it in a capsule so as to have a sustained release property and to have a termite-preventing effect for a long period of time.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the dovetail cable of the present invention will be described with reference to the drawings. The termite-proof cable 1 shown in FIG. 1 has a sheath 5 for covering a three-core conductor 3 covered with an insulator 2 made of polyvinyl chloride, cross-linked polyethylene or the like via an interposer (paper or jute) 4 with electric power. It is a cable. The sheath 5 is made of soft polyvinyl chloride, polyethylene, cross-linked polyethylene, which is generally used as a cable covering material.
It is formed from chloroprene rubber, chlorosulfonated polyethylene, or the like.

An anti-termite layer 6 is provided in such a sheath 5. The ant-preventive layer 6 has a base material such as soft polyvinyl chloride, polyethylene, cross-linked polyethylene, chloroprene rubber, or chlorosulfonated polyethylene, which is a cable covering material used for the sheath 5, and contains 0.01 to 100% of diethyltoluamide.
Consisting of 10 weight percent added. Diethyltoluamide has the structure shown below, has an insecticidal effect on termites,

[0010]

[Chemical 1]

Moreover, it is highly safe for the human body. Furthermore, it is stable to heating and does not decompose even at the extrusion temperature of the coating, eg 200 ° C.
Diethyltoluamide may be directly kneaded into the base material, or may be mixed into microcapsules so as to have sustained release.

To microencapsulate diethyltoluamide, an inorganic porous microcapsule wall, for example, a porous capsule is formed by an interfacial reaction method using silicon oxide as a base, or a melamine wall microcapsule wall material is used. It can be carried out by a usual method, such as adding diethyltoluamide, and gradually reducing the pressure and then returning to normal pressure for microcapsulation. By adjusting the amount of the wall material of the microcapsule, the sustained release property of diethyltoluamide can be adjusted and controlled. The amount of diethyltoluamide included in the microcapsules is preferably 30% by weight or more, and even if microencapsulated, 0.01 to 10% by weight of diethyltoluamide is substantially contained in the ant-repellent layer. If so, a suitable anti-termite effect can be obtained. When the content of diethyltoluamide is 0.01% by weight or less, the termite-proof effect is poor, and when it exceeds 10% by weight, the processing stability and cold resistance of the material are deteriorated, which is not preferable.

If the primary average particle size of the microcapsules is too small, the agglomeration tends to occur, and if it is too large, the mechanical strength and cold resistance of the added material tend to decrease, so that 1-50 μm.
m is preferred. The anti-termite layer 6 may be provided inside the sheath 5 so that the anti-termite effect is not impaired even if the sheath surface of the cable, which is susceptible to external damage, is damaged. In this case, it is preferable that the anti-termite layer 6 is provided within 50% from the surface layer having the thickness of the sheath 5.
This is because even if external damage occurs, it is unlikely that the termite prevention layer 6 will be damaged, and even if the surface layer of the sheath 5 is damaged by termites, the insulation thickness can be maintained. However, the termite-proof cable 7 in which the termite-proof layer 6 is provided on the surface of the sheath 5 may be used. In this case, as long as the outermost sheath 5 of the ant-terminated cable is not damaged, the inside can be completely ant-terminated.

Further, as shown in FIG. 3, a termite-proof cable 9 may be provided in which a termite-proof sheath 8 containing diethyltoluamide is provided on the entire sheath. To form the above-described diethyltoluamide-containing termite-preventing layer 6, the diethyltoluamide-containing resin can be extruded together with the extruder when forming the sheath 5. The dovetail cable 1 can be molded with a three-layer extruder, the dovetail cable 7 with a two-layer extruder, and the dovetail cable 9 with a one-layer extruder. Alternatively, although the number of working steps is increased, the coating may be formed for each layer by two or three extrusion operations. Ant-proof layer 6,
Alternatively, the thickness of the dovetail sheath is preferably 0.2 mm or more.

For example, in the case of imparting flame retardancy to the termite-proof cable thus formed, in the case of the termite-proof cables 1 and 7 having the termite-proof layer 6, a flame retardant or other coloring agent is added to the sheath 5. The termite-preventing layer 6 may contain a suitable amount of termite-preventing agent so that only the termite-preventing effect can be obtained without considering the proportion of the other terminator. Easy to design. Anti-termite cable 9 having an anti-termite sheath 8
Also, or the termite-proof layer 6 of the termite-proof cables 1 and 7
However, it goes without saying that other additives such as flame retardants can be appropriately mixed.

Examples 1 to 10 Examples will be described below. A 0.8 mm thick cross-linked polyethylene insulator 2 is provided on a 2 mm ² single-core conductor 3 shown in FIG. 4, and an 0.8 mm thick inner sheath 51 and a 0.1 to 0.3 mm thick diethyl sheath 51 are sequentially arranged from the conductor 3 side. A termite-proof cable 11 having a three-layer structure of a torusamide-added termite-proof layer 6 and a 0.4 mm-thick outer sheath 52 was prepared. Polyvinyl chloride (PV as sheath material
C), polyethylene (PE), chloroprene rubber (C
R) and chlorosulfonated polyethylene (CRM) were used. Both ends of the termite-proof cable 11 are molded with epoxy resin and are as they are, those that are heat cycled at 100 ° C. for 5 days, and those that have been weather-tested for 500 hours, respectively, as shown in FIG. The test pieces were placed in a petri dish together with black pine wood 12 and 50 termite termite workers were placed in the petri dish and tested at 28 ± 2 ° C. for 3 weeks. The evaluation results shown in Table 2 show the results in Table 1.

Similarly, as Comparative Examples 1 to 6, those having a low content of diethyltoluamide, those having a thin ant-preventing layer, and those using an organic phosphorus type or copper naphthenate as an ant-preventing agent were tested. The results are shown in Table 1.

[0018]

[Table 1]

[0019]

[Table 2]

[Examples 11 to 18] Polyvinyl chloride (PVC), polyethylene (PE), chloroprene rubber (CR), and PR-polyethylene were used as sheath materials, diethyltoluamide was added to each, and the protection shown in FIG. Create an ant cable, place it with black pine wood in a petri dish as shown in Fig. 5, and insert 30 termite worker ants for 28
The test was conducted at ± 2 ° C for 3 weeks. The results of the evaluations shown in Table 2 are shown in Table 3.

Similarly, as Comparative Examples 7 to 12, those having a small content of diethyltoluamide, those having a thin ant-preventing layer, and those using an organic phosphorus type or copper naphthenate as an ant-preventing agent were tested. In Comparative Example 11, diethyltoluamide microcapsules having a primary particle size of 100 μm were used. The results are shown in Table 3.

[0022]

[Table 3]

[0023]

As is apparent from the above description, the termite-preventing cable of the present invention is provided with the termite-preventing layer containing diethyltoluamide, and therefore the termite insecticidal effect is reduced even when heat cycle is performed. Without, the cable will not be eaten. In addition, by encapsulating diethyltoluamide in microcapsules, the insecticidal effect can be maintained for a longer period of time, which is very effective.

Further, by providing the ant-preventing layer inside the sheath instead of the outermost part, the termite is not easily exposed to the food from the surface which is easily damaged, and the mixing ratio with the flame retardant and other additives is adjusted. The effects of various additives can be obtained without consideration.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment to which a dovetail cable of the present invention is applied.

FIG. 2 is a sectional view of another embodiment of the dovetail-proof cable of the present invention.

FIG. 3 is a sectional view of another embodiment of the dovetail-proof cable of the present invention.

FIG. 4 is a cross-sectional view of another embodiment of the dovetail-proof cable of the present invention.

FIG. 5 is a diagram showing a test of the termite-proof cable of the present invention.

[Explanation of symbols]

 1, 7, 9, 11 ... Dovetail cable 5 ......... Sheath 6 ......... Doveproof layer 8 ...

Claims (2)

[Claims] 1. A termite-proof cable characterized in that a synthetic resin sheath forming the outermost layer of the cable is provided with a termite-proof layer containing diethyltoluamide. 2. The termite-proof cable according to claim 1, wherein diethyltoluamide is microencapsulated.