JP2860811B2 - Termite cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an insulating layer comprising a vinyl halide polymer,
The present invention relates to an ant-prevention cable in which a cable covering material such as a sheath is prevented from being damaged by termites or the like.

[Problems to be solved by conventional technologies and inventions]

Generally, power / communication / optical communication cables and other cables have a structure in which a conductor is covered with an insulating layer, a sheath, or the like.

At present, vinyl halide polymers are widely used as cable covering materials such as insulating layers and sheaths.If they are used for a long time while buried in the ground, for example, they are damaged by termites such as house termites and Yamato termites. There is a problem of suffering.

For these reasons, for the purpose of preventing termites from eating damage, organic compounds and inorganic compounds conventionally used in agricultural chemicals and the like, especially termite-controlling compounds for termite-control cables such as phosphorus-based compounds have been used. ing.

The termite-controlling compound for termite-control cables is required to have the following properties.

Good water resistance against inundation from outside, such as underground buried environment, that is, good resistance to runoff and hydrolysis.

It has excellent safety for production systems.

Excellent thermal stability when mixed at high temperatures.

Excellent in termite resistance.

However, in reality, there are few termite-controlling compounds having such excellent properties.

For these reasons, in recent years, microencapsulation techniques for coating or polymerizing termite-resistant compounds with resins and the like have been used, and various measures have been taken to maintain moldability and long-term performance. It is long and expensive, and there are questions about the persistence of toxicity, and it is hardly satisfactory.

On the other hand, there is a method of extruding hard plastics such as nylon 12 without using a termite-controlling compound, or winding a tape around a conductor.However, the flexibility of the cable is poor, and large-sized cables have been used. There are drawbacks such as difficulty in molding.

Accordingly, an object of the present invention is to provide a termite-resistant cable containing a termite-resistant compound having the above-listed properties and having good flexibility and mechanical properties.

[Means for solving the problem]

The present inventor has conducted various studies to achieve the above object, and found that a halogenated polymer was blended with a benzimidazole-based compound as a termiticide, and this was used to coat a cable such as an insulating layer and a sheath. By covering the conductor as a material, a cable having a high termite-controlling effect was successfully achieved, and the present invention was completed.

That is, the present invention is a termite-resistant cable having a layer made of a vinyl halide polymer containing a benzimidazole compound.

In the present invention, the cable includes a power (including high-voltage and low-voltage) cable, a communication (optical communication / telecommunication, etc.) cable, a high-frequency cable and other cables, and furthermore, an insulated cable or an electronic device wired indoors or outdoors. Cable, vehicle cable, marine cable, and other cables.

As the benzimidazole compound in the present invention, a benzimidazole compound having at least one benzimidazole structure represented by the following formula (I) in the molecule and having a molecular weight of 100 or more [hereinafter, benzimidazole compound] Compound (A)] is preferred.

The molecular weight of the benzimidazole compound (A) is 100 or more, preferably 150 to 400.

As the benzimidazole compound (A) used in the present invention, a compound represented by the following formula (II) or (III) can be mentioned as a preferred specific example.

(Wherein, X represents a hydrogen atom or a lower alkyl group) (Wherein X has the same meaning as described above) As the lower alkyl group in the present specification, those having 1 to 4 carbon atoms such as methyl, ethyl, propyl, isopropyl and t-butyl are usually preferable. Particularly, methyl is preferred.

Specific examples of the benzimidazole compound (A) include, for example, 2-mercaptobenzimidazole (“No.
crac MB ", Ouchi Shinkosha MW150), 2-mercaptomethylbenzimidazole (" Nocrac MMB ", Ouchi Shinkosha MW164), zinc salt of 2-mercaptobenzimidazole (" Nocrac MBZ ", Ouchi Shinkosha, MW363), 2-
Zinc salt of mercaptomethylbenzimidazole ("Nocr
ac MMBZ ", Ouchi Shinko Co., Ltd., MW393), a blend of 4 and 5-methylmercaptobenzimidazole (" Vulkan
ox MBZ ", Bayer, MW163), zinc salts of blends of 4 and 5-methylmercaptobenzimidazole [" Vulkanox ZMB-2 ", Bayer, MW392].

In the present invention, the termites to be protected include termites, termites, termites, termites, termites, termites, termites, termites, termites, termites, termites, termites, and termites. , Or anything belonging to the order of the termites such as the American termite, especially the termites,
Yamato termites and the like are preferred. The benzimidazole-based compound acts as an anticide, ant repellent, etc. for these ants.

In the termite control cable of the present invention, the vinyl halide polymer for covering each electric wire constituting the layer made of the vinyl halide polymer has an average degree of polymerization of 500 to 3,000, preferably 1,000 to 2,000. . The vinyl halide polymer may be either plasticized or non-plasticized. Examples of the plasticized product include those plasticized externally by adding a known plasticizer and those plasticized internally by a known means. As the halogenated vinyl polymer, a vinyl chloride polymer, an ethylene-vinyl acetate copolymer, an ethylene-vinyl acetate-
A blend of a chlorinated graft terpolymer, a urethane polymer and the like is exemplified.

When plasticizing, dioctyl phthalate (DO
P), dibutyl phthalate (DBP), tricresyl phosphate (TCP), dioctyl sebacate (DOS), dioctyl adipate (DOA), diisodecyl phthalate (DID)
Plasticizers such as P) and diisononyl phthalate (DINP) are used. When a plasticizer is used, it is preferable to add about 40 parts by weight of the plasticizer to 100 parts by weight of the resin.

In the termite control cable of the present invention, the blending ratio of the halogenated vinyl polymer and the benzimidazole-based compound is 100 parts by weight of the halogenated vinyl polymer, and the benzimidazole-based compound is usually about 0.1 to 20 parts by weight, Preferably, it is about 0.5 to 5 parts by weight.

In the present invention, if necessary, other components such as a carrier, another termiticide, an antioxidant (a hindered phenolic antioxidant, a sulfuric antioxidant, etc.), a flame retardant may be added to the halogenated vinyl polymer. (Aluminum hydroxide, magnesium hydroxide, zinc oxide, organic phosphate, etc.),
Fillers (carbon, silica, etc.), crosslinking agents, crosslinking aids,
Colorants, extenders or other additives may be incorporated in required amounts.

Since the benzimidazole-based compound is generally stable to heat, a resin composition of a halogenated vinyl polymer containing the benzimidazole-based compound may be prepared by a method known per se, such as extrusion or calendering. Can be formed into a cable by subjecting it to heat processing. Moreover, this cable can be crosslinked by a chemical crosslinking method such as organic peroxide crosslinking or water crosslinking, or by a method such as electron beam irradiation crosslinking.

In the termite cable of the present invention, the layer made of a vinyl halide polymer blended with a benzimidazole compound may be provided as an arbitrary layer.
In any form such as an insulating layer and a sheath, the termite-controlling effect is sufficiently exhibited.

[Action / Effect]

The benzimidazole compound used in the present invention,
It has an excellent ant repellent action (ant repellent action, etc.) against ants as described above, and is excellent in biological system safety, heat stability, and water resistance (ie, spill resistance, hydrolysis resistance). The termite-proof cable of the present invention has extremely little damage even when laid in a place where there is a risk of termite damage.
This layer is extremely useful because it has an excellent termitic effect so that there is no risk of the layer being perforated, and the flexibility and mechanical properties of the cable are maintained.

〔Example〕

Hereinafter, examples of the present invention will be described, but the present invention is not limited thereto.

Examples 1 to 5 and Comparative Example 1 The termite-controlling compositions shown in Table 1 were prepared and subjected to a piercing test using the termite-controlling layer (also used as an insulating layer and a sheath).

Experimental Example 1 A cable having a mode in which a termite-proof layer (also used as insulation and sheath) was provided on a conductor was prepared.

Using the 1 m-long sample cables of the above Examples and Comparative Examples, an experiment was performed to measure the termite-controlling effect by the following test method.

(Piercing test) A case filled with soil was prepared, and a sample cable (15 cm long), 200 termites and 20 soldiers were put together in the soil, and the termites were observed to pierce the cable. The test results are shown in Table 1.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI // A01N 43/52 A01N 43/52

Claims (1)

(57) [Claims] An anti-termite cable comprising a layer comprising a vinyl halide polymer containing a benzimidazole compound represented by the following formula (II) or (III): (Wherein, X represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms)