JP7022721B2 - Anti-termite electric wire / cable - Google Patents

Description

The present invention relates to an anti-termite electric wire / cable.

In cables such as electric wires, it has been proposed to cover the periphery with an anti-termite sheath formed of an anti-termite compound, for example, in order to prevent feeding damage by ants such as termites. As the termiticide, for example, a neonicotinoid compound such as clothianidin is used.

If the amount of clothianidin added is too large, the clothianidin has a saturated anti-termite effect and is an expensive material, which is uneconomical. Further, as the addition ratio of clothianidin increases, the cold resistance decreases. On the other hand, it is necessary to set the initial addition amount of clothianidin so that the anti-termite effect can be maintained for a long period of time in consideration of the life of the cable. Therefore, it is not easy to achieve both cold resistance and ant-proofing effect.

It has been proposed to provide a coating of a hard and tough resin such as nylon resin on the outermost layer of the cable without using an anti-termite sheath to which an anti-termite agent is added. However, in this case, there is a problem that the flexibility of the cable is lowered and the allowable bending radius is increased.

Japanese Unexamined Patent Publication No. 2006-324017

As described above, in the anti-termite sheath using the conventional anti-termite compound, it is not easy to achieve both cold resistance and anti-termite effect.

Therefore, an object to be solved by the present invention is to provide an anti-termite electric wire / cable that can easily achieve both cold resistance and anti-termite effect.

The anti-termite electric wire / cable of the present invention comprises 100 parts by mass of vinyl chloride resin, 0.01 parts by mass or more and 0.17 parts by mass or less of clothianidin, and 20 parts by mass or more and 40 parts by mass or less of a plasticizer. The plasticizer contains at least 10 parts by mass or more of an aliphatic dibasic acid ester, and the aliphatic dibasic acid ester is an adipate ester, an azelaic acid ester and a sebacic acid. At least one of the acid esters is used.

According to the present invention, it is possible to provide an anti-termite electric wire / cable that can easily achieve both cold resistance and anti-termite effect.

FIG. 1 is a cross-sectional view schematically showing the configuration of the ant-proof electric wire / cable 1 according to the embodiment. FIG. 2 is a cross-sectional view schematically showing the configuration of the anti-termite electric wire / cable 1 according to the modified example of the embodiment. FIG. 3 is a cross-sectional view schematically showing the configuration of the anti-termite electric wire / cable 1 according to the modified example of the embodiment.

Hereinafter, embodiments of the invention will be illustrated with reference to the drawings. The invention is not limited to the contents of the drawings. Further, the drawings show an outline, and the dimensional ratios of each part do not always match the actual ones.

[A] Anti-termite electric wire / cable FIG. 1 is a cross-sectional view schematically showing the configuration of the anti-termite electric wire / cable 1 according to the embodiment. FIG. 1 shows a cross section (xy plane) in which the extending direction z of the anti-termite electric wire / cable 1 is orthogonal to each other.

As shown in FIG. 1, the anti-termite electric wire / cable 1 of the embodiment has a cable core 10, a sheath 20, and an anti-termite sheath 30. Each part constituting the anti-termite electric wire / cable 1 will be described in sequence.

[A-1] Cable core 10
The cable core 10 includes a plurality of insulated cores 11. Here, the cable core 10 is configured to include three insulated wire cores 11.

In the cable core 10, the outer peripheral surface of the conductor 111 of the insulating wire core 11 is covered with the insulating layer 112. Of the insulating wire cores 11, the conductor 111 is formed of a conductive material such as copper or aluminum, and the insulating layer 112 is formed of an insulating material such as polyethylene or cross-linked polyethylene. The cable core 10 is configured by twisting a plurality of insulated wire cores 11 together with the interposition 12. The interposition 12 is made of an insulating material such as paper or jute.

[A-2] Sheath 20
The sheath 20 is provided so as to cover the outer peripheral surface of the cable core 10. The sheath 20 is formed by performing extrusion molding on an insulating resin such as polyethylene, cross-linked polyethylene, and vinyl chloride resin.

[A-3] Anti-termite sheath 30
The anti-termite sheath 30 is provided so as to cover the outer peripheral surface of the cable core 10 via the sheath 20. The anti-termite sheath 30 has a thickness of, for example, 0.2 mm or more. The termiticide sheath 30 is formed by performing extrusion molding on an termite-proof compound containing a termiticide.

[B] Anti-termite compound An anti-termite compound used in forming the anti-termite sheath 30 will be described.

In the present embodiment, the anti-termite compound is a mixture (anti-termite resin composition) containing a vinyl chloride resin (polyvinyl chloride), an anti-termite agent and a plasticizer. Specifically, the anti-termite compound of the present embodiment contains 0.01 parts by mass or more and 0.50 parts by mass or less of clothianidin as an anti-termite agent with respect to 100 parts by mass of vinyl chloride resin, and is aliphatic. Contains a plasticizer containing a dibasic acid ester.

[B-1] Termiticide The clothianidin added as an termiticide in the termiticide compound is represented by the following chemical formula.

Crossianidin is an anti-termite agent having an excellent anti-termite effect (anti-termite effect) on termites, and has a very low vapor pressure and does not easily volatilize into the environment, so that it has low environmental pollution. In addition, clothianidin is not subject to the Poisonous and Deleterious Substances Control Law. For this reason, clothianidin is extremely safe. In addition, clothianidin does not impair the extrudability of the anti-termite compound and does not reduce properties such as electrical properties commonly required for cables.

As described above, in the anti-termite compound, clothianidin of 0.01 part by mass or more and 0.50 part by mass or less is added to 100 parts by mass of vinyl chloride resin. If the addition ratio of clothianidin is less than the lower limit of the above range, the durability of the anti-termite sheath 30 regarding the anti-termite effect may be insufficient. When the addition ratio of clothianidin exceeds the upper limit of the above range, the material cost of clothianidin may increase and the cold resistance may decrease even though the anti-termite effect is almost the same as the above range. be.

In the anti-termite compound, clothianidin is kneaded directly into, for example, a vinyl chloride resin. In addition, the clothianidin may be mixed with the vinyl chloride resin in a state of being encapsulated in the microcapsules so that the clothianidin has a sustained release property that is gradually released to the outside.

[B-2] Plasticizer In the anti-termite compound, at least an aliphatic dibasic acid ester is used as the plasticizer.

As the aliphatic dibasic acid ester, as shown below, it is preferable to use at least one of adipate ester, azelaic acid ester and sebacic acid ester.

(Adipate ester)
・ Di (2-ethylhexyl) adipate (abbreviation: DOA)
・ Diisononyl adipate (abbreviation: DINA)
・ Diisodecyl adipate (abbreviation: DIDA)

(Azelaic acid ester)
-Di (2-ethylhexyl) azelaic acid (abbreviation: DOZ)

( Sebacic acid ester)
-Di (2-ethylhexyl) sebacate (abbreviation: DOS)

Further, a plasticizer other than the above-mentioned aliphatic dibasic acid ester may be used. For example, as shown below, commonly used plasticizers may be used in combination with aliphatic dibasic acid esters.
・ Diisononyl phthalate (abbreviation: DINP)
・ Trioctilt Limeritate (abbreviation: TOTM)

In the anti-termite compound, the addition ratio of the plasticizer can be arbitrarily set according to the characteristics required for the anti-termite sheath 30, but for example, 20 parts by mass or more with respect to 100 parts by mass of vinyl chloride resin. It is preferable to add 60 parts by mass or less of the plasticizer. This makes it possible to achieve both strength and flexibility for the anti-termite sheath 30.

As for the aliphatic dibasic acid ester, it is preferable to add 2 parts by mass or more as a plasticizer to 100 parts by mass of the vinyl chloride resin. The details will be described later, but this can sufficiently improve the cold resistance of the ant-proof sheath 30.

[B-3] Other Additives In the termiticide compound, additives other than termiticide and plasticizer may be added to the vinyl chloride resin, depending on the required properties. For example, when imparting flame retardancy to the anti-termite sheath 30, a flame retardant may be added to the anti-termite compound. Of course, the sheath 20 may contain a flame retardant. Further, the sheath 20 may be configured to contain a flame retardant, and the termiticide sheath 30 may be configured to contain a termiticide and a plasticizer without containing the flame retardant.

In addition, as an additive, a filler or a heat stabilizer may be appropriately added.

[C] Manufacturing Method A manufacturing method of the anti-termite electric wire / cable 1 of the present embodiment will be described.

When manufacturing the above-mentioned anti-termite electric wire / cable 1, for example, an extruder is used to simultaneously form a sheath 20 and an anti-termite sheath 30 on the outer peripheral surface of the cable core 10. In addition, after forming the sheath 20 on the outer peripheral surface of the cable core 10, the anti-termite sheath 30 may be formed on the outer peripheral surface of the sheath 20.

[D] Summary As described above, the anti-termite sheath 30 produced by the anti-termite compound according to the embodiment has low environmental pollution because the addition ratio of clothianidin, which is an anti-termite agent, is within the above-mentioned specific range. It has high extrusion processability and suitable electrical characteristics. Further, although the details will be described in Examples described later, the anti-termite sheath 30 produced by the anti-termite compound according to the embodiment can have both cold resistance and anti-termite effect.

[E] Modification Example In the above embodiment, the ant-proof electric wire / cable 1 having the cable core 10, the sheath 20, and the ant-proof sheath 30 has been described, but the present invention is not limited to this.

2 and 3 are cross-sectional views schematically showing the configuration of the ant-proof electric wire / cable 1 according to the modified example of the embodiment. 2 and 3 show cross sections (xy planes) in which the extending directions z of the anti-termite electric wire / cable 1 are orthogonal to each other, as in FIG.

As shown in FIG. 2, the anti-termite electric wire / cable 1 does not have a sheath 20 (see FIG. 1), and the anti-termite sheath 30 may be configured to directly cover the outer peripheral surface of the cable core 10. .. In this case, the thickness of the anti-termite sheath 30 may be thicker than that in the case of the above embodiment (see FIG. 1).

In addition to this, as shown in FIG. 3, the ant-proof electric wire / cable 1 may have a single insulated wire core 11 instead of a plurality of insulated wire cores 11. In this case, for example, the outer peripheral surface of the insulating wire core 11 is configured such that the sheath 20 and the anti-termite sheath 30 are sequentially laminated. Although not shown, the anti-termite electric wire / cable 1 may have a configuration in which the anti-termite sheath 30 directly covers the outer peripheral surface of the insulating wire core 11 (a configuration in which the sheath 20 is not provided in FIG. 3). Further, the anti-termite electric wire / cable 1 is composed of an insulating layer formed on the outer peripheral surface of the conductor 111 by using an anti-termite compound (the sheath 20 and the anti-termite sheath 30 are not provided in FIG. 3 and the insulating layer 112 is not provided. The material may be formed of the material of the anti-termite sheath 30).

Hereinafter, Examples and Comparative Examples will be described with reference to Tables 1 and 2. In addition, in order to facilitate understanding, in the description of Examples and Comparative Examples, the reference numerals of the respective parts are appropriately used as in the above-described embodiment.

[1] Preparation of sample [1-1] Examples A-1 to A-4
In Example A-1, as shown in Table 1, di (2-ethylhexyl) azelaic acid (abbreviation: DOZ) and diisononyl phthalate (abbreviation: DINP) were added to the vinyl chloride resin as plasticizers. An anti-termite compound was prepared by adding clothianidin as an anti-termite agent, calcium carbonate as a filler, and a lead-free stabilizer as a heat stabilizer.

Specifically, 100 parts by mass of vinyl chloride resin (polymerization degree: 1700), 10 parts by mass of di (2-ethylhexyl) azereate (abbreviation: DOZ), and 30 parts by mass of diisononyl phthalate (abbreviation: DINP). ), 0.01 parts by mass of clothianidin, 30 parts by mass of calcium carbonate (average particle size: 1.8 μm, specific surface area: 12000 cm ² / g), and 5 parts by mass of lead-free stabilizer (with zinc stearate). (Mixed with hydrotalcite) was mixed and uniformly kneaded using an open roll at 160 ° C., and then press-molded at 180 ° C. to prepare a sheet sample of an anti-termite compound.

In each of Example A-2 , Reference Example A-3, and Reference Example A-4 , as shown in Table 1, Example A except that the addition ratio of clothianidin is different from that of Example A-1. As in the case of -1, a sample was formed after preparing the anti-termite compound.

[1-2] Reference Example B-1 , Example B-2
In Reference Example B-1 and Example B-2, as shown in Table 1, the addition ratios of di (2-ethylhexyl) azelaate (abbreviation: DOZ) and diisononyl phthalate (abbreviation: DINP) are As in the case of Example A-2, a sample was formed after preparing the anti-termite compound, except that the case was different from that of Example A-2.

[1-3] Examples C-1 to C-4
In each of Examples C-1 to C-4, as shown in Table 2, except that an aliphatic dibasic acid ester other than di (2-ethylhexyl) azelaic acid (abbreviation: DOZ) was used. In the same manner as in Example A-1, a sheet-shaped sample was formed after preparing the anti-termite compound.

Specifically, in Example C-1, di (2-ethylhexyl) adipate (abbreviation: DOA) was used. In Example C-2, diisononyl adipate (abbreviation: DINA) was used. In Example C-3, diisodecyl adipate (abbreviation: DIDA) was used. In Example C-4, di (2-ethylhexyl) sebacate (abbreviation: DOS) was used.

[1-4] Reference Example D
In Reference Example D, as shown in Table 2, the addition ratios of di (2-ethylhexyl) azelaate (abbreviation: DOZ) and diisononyl phthalate (abbreviation: DINP) are different from those in Reference Example A-4. A sample was formed after preparing the anti-termite compound in the same manner as in Reference Example A-4.

[1-5] Comparative Example X-1, Comparative Example X-2
In Comparative Example X-1, as shown in Table 2, an ant-proof compound was prepared in the same manner as in Example A-1 except that the addition ratio of clothianidin was different from that in Example A-1. Later, a sample was formed.

In Comparative Example X-2, Examples were obtained except that the addition ratios of di (2-ethylhexyl) azelaic acid (abbreviation: DOZ) and diisononyl phthalate (abbreviation: DINP) were different from those of Example A-4. As in the case of A-4, a sheet-shaped sample was formed after preparing the anti-termite compound. In Comparative Example X-2, di (2-ethylhexyl) azelaic acid (abbreviation: DOZ) was not added.

[2] Test method As shown in Tables 1 and 2, various tests were performed on the samples of each example prepared as described above.

[2-1] Anti-termite effect When conducting a test to confirm the anti-termite effect, first, a vinyl chloride pipe (diameter) is placed on the upper surface of the anti-termite sheet (50 × 50 mm, thickness 1 mm) prepared in each example. 25 mm, height 10 mm) was installed. Here, the pipe was installed so that the pipe axis of the pipe was orthogonal to the upper surface of the sheet. After that, 50 termites were placed inside the pipe installed on the upper surface of the sheet. Then, the behavior of termites was observed over time, and the knockdown rate of termites was determined. The termite knockdown rate is the ratio of dead termites among the termites used in the test.

Tables 1 and 2 show the results of a confirmation test of the ant-proofing effect based on the following criteria.
・ ○; When the termite knockdown rate exceeds 80% within 24 hours ・ ×; When the termite knockdown rate is 80% or less within 24 hours

[2-2] Cold resistance The test for confirming cold resistance was carried out based on the contents described in "JIS C 3005 (2014) Section 4.22 Cold resistance". The test was performed under conditions where the temperature was changed in 1 ° C increments.

In Tables 1 and 2, the minimum temperature at which fracture does not occur in the samples of each example is shown.

[3] Test results [3-1] Test results of Example A-1 , Example A-2, Reference Example A-3, Reference Example A-4 Example A-1 , Example A-2, Reference Each of the anti-termite compounds of Examples A-3 and Reference Example A-4 contains 0.01 parts by mass or more and 0.50 parts by mass or less of clothianidin as an anti-termite agent with respect to 100 parts by mass of vinyl chloride resin. At the same time, it contains a plasticizer containing an aliphatic dibasic acid ester. Therefore, in Example A-1 , Example A-2, Reference Example A-3, and Reference Example A-4 , both cold resistance and anti-termite effect can be achieved at the same time.

Specifically, Example A-1 , Example A-2, Reference Example A-3, and Reference Example A-4 have an excellent anti-termite effect as compared with the case of Comparative Example X-1. Further, in Examples A-1 to A-4, fracture does not occur at a temperature of −15 ° C. or higher, so that the examples have better cold resistance than the case of Comparative Example X-2.

[3-2] About the test results of Reference Example B-1 and Example B-2
In each of the anti-termite compounds of Reference Example B-1 and Example B-2, the addition ratio of di (2-ethylhexyl) azelaic acid (abbreviation: DOZ) and diisononyl phthalate (abbreviation: DINP) was carried out. This is different from the case of Example A-2.

In Reference Example B-1 , the content ratio of di (2-ethylhexyl) azelaic acid (abbreviation: DOZ) is 2 parts by mass, which is smaller than that in Example A-2. However, as shown in Table 1, in Reference Example B-1 , even in Reference Example B-1, an excellent ant-proofing effect is obtained as in the case of Example A-2. At the same time, Reference Example B-1 has excellent cold resistance because no fracture occurs at a temperature of −15 ° C. or higher.

In Example B-2, the content ratio of di (2-ethylhexyl) azelaic acid (abbreviation: DOZ) is 20 parts by mass, which is higher than that in Example A-2. However, as shown in Table 1, in Example B-2, as in the case of Example A-2, an excellent ant-proofing effect is obtained. At the same time, Example B-2 has excellent cold resistance because no fracture occurs at a temperature of −15 ° C. or higher.

[3-3] About the test results of Examples C-1 to C-4 In each of the anti-termite compounds of Examples C-1 to C-4, as shown in Table 2, the azelaic acid didi. Contains aliphatic dibasic acid esters other than (2-ethylhexyl) (abbreviation: DOZ). As can be seen from the results of Examples C-1 to C-4, even when an aliphatic dibasic acid ester other than di (2-ethylhexyl) azelaic acid (abbreviation: DOZ) is used, Example A- As in the case of 2, both cold resistance and anti-termite effect can be achieved.

[3-4] Test Results of Reference Example D In the anti-termite compound of Reference Example D, as shown in Table 2, the content ratio of di (2-ethylhexyl) azelaic acid (abbreviation: DOZ) is 1 part by mass. However, it is less than the case of Reference Example A-4. However, as shown in Table 2, in Reference Example D, an excellent ant-proofing effect is obtained as in the case of Reference Example A-4. In Reference Example D, in the cold resistance test, fracture occurs at a higher temperature than in Reference Example A-4, but fracture does not occur at a temperature of −5 ° C. or higher, so that the reference example D has excellent cold resistance.

1 ... Anti-termite wire / cable, 10 ... Cable core, 11 ... Insulated wire core, 12 ... Interposition, 20 ... Sheath, 30 ... Anti-termite sheath, 111 ... Conductor, 112 ... Insulation layer

Claims (2)

For 100 parts by mass of vinyl chloride resin
With clothianidin of 0.01 parts by mass or more and 0.17 parts by mass or less,
With a plasticizer of 20 parts by mass or more and 40 parts by mass or less,
Formed using an ant-proof compound containing
The plasticizer contains at least 10 parts by mass or more of an aliphatic dibasic acid ester.
As the aliphatic dibasic acid ester, at least one of adipate ester, azelaic acid ester and sebacic acid ester is used.
Anti-termite electric wire / cable. The plasticizer comprises the aliphatic dibasic acid ester and a plasticizer other than the aliphatic dibasic acid ester.
The anti-termite electric wire / cable according to claim 1.

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