JP2525104Y2 - Rat-proof electric wire - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention provides a mouse-proof electric wire (power cable,
Communication cable).

[Conventional technology]

In general, electric wires such as power and communication cables have a conductor core made of copper or the like at the center, and the core is covered with an insulating layer or a sheath. Such wires are
Depending on the installation location, especially in the habitats of rats, the rats are susceptible to damage by the rats, which may lead to accidents such as disconnection or short circuit. Therefore, it is necessary to make the electric wires rat-proof.

Conventionally, rodent-proof electric wires have been prepared by placing an insulating sheath containing cycloheximide, which is the most effective as a rat-proofing agent, as the outermost layer of the electric wire, or forming a film containing cycloheximide on the outermost sheath. Rat measures are taken.

However, since cycloheximide, a rat-proofing agent, is easily decomposed by water and inactivated by water, and easily eluted by water, if the electric wire is wet by rainwater, etc., the cycloheximide in the outermost sheath or the coating becomes inactive, The rat-proof effect decreases.

In order to solve this problem, attempts have been made to make cycloheximide into a microscopic microcapsule and to include it in a sheath or a film.

[Problems to be solved by the invention]

Rat-proof electric wire microcapsulated with the above cycloheximide, the waterproofness is improved by the capsule compared to the electric wire using cycloheximide directly in the sheath or film,
The anti-rat effect has also been improved.

However, microcapsules were initially sufficiently waterproof to inactivate cycloheximide in the capsule,
Although it was considered not to be eluted, as a result of various studies by the present inventors, cycloheximide in the microcapsule was still chemically decomposed by moisture,
Since it becomes inert and is eluted by water, it has been found that microencapsulation has a disadvantage that the water-resistant protective action of cycloheximide cannot be sufficiently performed.

For this reason, the microencapsulated rat-proof electric wire is still weak against rainwater and the like, and there is a problem that the rat-proof effect is inevitably reduced.

Accordingly, an object of the present invention is to provide a rat-proof electric wire which uses microencapsulated cycloheximide as a rat-proofing agent and does not reduce the rat-proofing effect of the rat-proofing agent even with water.

[Means for solving the problem]

As a result of intensive research, the inventors of the present invention have a conductor core wire, a sheath existing on the surface side of the core wire, a skin layer existing on the surface side of the sheath, and a waterproof layer that is the outermost layer. A chloride (PVC) or PVC-based copolymer, wherein the skin layer is at least PVC or a PVC-based copolymer, microencapsulated cycloheximide, and 1% to 50% by weight of a water repellent based on the total composition forming the skin layer And if the skin layer does not contain a water-absorbing filler, or if it does contain a water-absorbing filler, its amount is not more than 15% by weight in the total composition forming the skin layer,
The inventors have found that the above-mentioned object is achieved, and have completed the present invention.

That is, the rat-proof electric wire of the present invention is, as described in the claims, a conductor core wire, a sheath made of at least PVC or a PVC copolymer covering the core wire, and a skin made of the specific material covering the sheath. And a waterproof layer as the outermost layer.

In the rat-proof electric wire of the present invention, since the outermost layer is a waterproof layer, water intrusion is substantially prevented by the waterproof layer, and the skin layer and the sheath disposed inside the waterproof layer are made of the above-described specific material. Even if water penetrates through the waterproof layer and reaches the skin layer, the water is effectively repelled by the skin layer, so that water does not enter the skin layer containing cycloheximide, and as a result, microencapsulation is performed. Cycloheximide remains active, and the rat-proof effect is maintained over a long period of time.

The rat-proof electric wire of the present invention has at least a conductor core wire, a sheath, a skin layer, and a waterproof layer as is clear from the above, but generally, an insulating layer is provided on the core wire to insulate the core wire. It is preferable to keep it. The sheath may double as the insulating layer.

The material of the waterproof layer which is the outermost layer of the electric wire is not particularly limited as long as it has a waterproof effect, and silicone oil [dimethyl silicone (such as KF96 manufactured by Shin-Etsu Chemical Co., Ltd.), methylphenyl silicone oil (Shin-Etsu Chemical Co., Ltd.) KF54, etc.)], paraffin, ultraviolet curable resin (acrylate, methacrylate, melamine, polyurethane, silicon, fluorine, acrylic, etc .; more specifically, manufactured by Dainichi Seika Kogyo Co., Ltd.) Seika Beam PH
C-2210 (S), Seika Beam PHC-X8 (K-1), etc., grease (silicone grease, mineral oil grease, etc.), polyethylene, PVC, PVdF (polyvinylidene chloride), PVdF (polyvinylidene fluoride), polyurethane modified (Meth) acrylic resin (Rackskin 6018 manufactured by Seiko Chemical Co., Ltd.), mixture of PVC and (meth) acrylic resin (Rackskin 101, 3 manufactured by Seiko Kasei Co., Ltd.)
01, rack coat 6875, etc.). The formation of the waterproof layer is carried out by, for example, applying the above-mentioned material on the skin layer by means of melt coating, extrusion coating, or coating in the form of a paint.

In the skin layer disposed on the inner side of the waterproof layer, the anti-mouse agent is microencapsulated cycloheximide. In the present invention, the microencapsulated cycloheximide is not particularly limited, and a conventionally known cycloheximide is sufficient. For example, cycloheximide dissolved or dispersed in a solvent is encapsulated with a microcapsule wall material made of a synthetic resin. In particular, those produced by an interfacial polymerization method of a capsule wall material prepared from an oil / water emulsion are preferable.

Examples of the solvent include alcohols, ketones, ethers, aliphatic hydrocarbons, aromatic hydrocarbons, mineral oils, and organic acid esters.

As the capsule wall material, for example, urea resin,
A melamine resin, a urea / melamine mixed resin, a phenol resin, a polyamide, a polyester, a polyurea, a polyurethane and the like are preferable, and a melamine resin and a polyamide resin are particularly preferable.

As the microencapsulated cycloheximide, those having an average particle size in the range of 1 to 80 μm, particularly 3 to 50 μm can be suitably used. The content of cycloheximide itself in the microencapsulated product is in the range of about 0.7 to 20% by weight, preferably about 2 to 10% by weight, based on the total weight of the microencapsulated product. Commercially available examples of such microencapsulated cycloheximide include, for example, naramycin microcapsule-D80 (NM-MC-D80: manufactured by Tanabe Seiyaku).
And the like.

As the PVC, a soft PVC mixed with a plasticizer is preferably used. As the soft PVC, those known per se may be used, and examples of the composition include those usually composed of PVC, a plasticizer, and a stabilizer, and those in which a pigment and a colorant are further added to the composition. . Known plasticizers and stabilizers may be used. The amount of the plasticizer is 0 to 100 parts by weight, preferably 30 to 100 parts by weight, based on 100 parts by weight of the resin.
60 parts by weight, and the amount of the stabilizer is 1 to 20 parts by weight, preferably 5 to 10 parts by weight. Examples of the PVC copolymer include ethylene-vinyl chloride copolymer, vinyl chloride-vinyl acetate copolymer, and the like, and it is preferable that the copolymer also contains the same plasticizer as described above. Similarly, a stabilizer and a pigment and a colorant may be further blended. At that time, the mixing amount of the plasticizer was 0 to 100 parts by weight of the resin.
To 100 parts by weight, preferably 20 to 50 parts by weight, and the compounding amount of the stabilizer is 1 to 20 parts by weight, preferably 5 to 10 parts by weight.

The water-absorbing filler is not incorporated in the skin layer, or even when it is incorporated, its amount is not more than 15% by weight, preferably not more than 10% by weight, particularly preferably not more than 5% by weight in the whole composition constituting the skin layer. % Or less. Examples of the water-absorbing filler include calcium carbonate, metal hydroxides (such as magnesium hydroxide and aluminum hydroxide), inorganic fillers such as talc and clay, and carbon.

Examples of the water repellent include higher fatty acids such as stearic acid, calcium stearate, and magnesium stearate, and metal salts thereof (particularly, alkaline earth metal salts), waxes (such as spermaceti and beeswax), mineral oil, asphalt, tar scum, Examples include glue, pine tar, silica, and polyethylene wax.

The skin layer is made of at least the anti-rat agent, water repellent, and PVC
Or it consists of a PVC copolymer, these compounding ratio,
The rodent-preventing agent is used in an amount of 0.05 to 5% by weight, preferably 0.1 to 2%, as cycloheximide with respect to all components constituting the skin layer.
% By weight, particularly preferably about 0.2% by weight,
0% by weight, preferably 5 to 15% by weight, particularly preferably 10% by weight.
%, PVC is 30 to 99% by weight, preferably 80 to 95% by weight, particularly preferably about 90% by weight. The amount of the water-absorbing filler is as described above.

The sheath covered with the skin layer should be at least as described above.
It is sufficient if it is made of PVC or a PVC copolymer, but it is preferable to contain a rat-proofing agent in order to impart a further rat-proofing effect to the electric wire, and further contain a water-repellent agent and the like like the skin layer Is preferred. Also, for the water-absorbing filler,
15% of the total sheath composition if not included or included
It is preferable that the content be not more than weight%.

A suitable blending ratio of each component in the sheath with respect to all components is such that PVC or PVC copolymer is 30 to 99% by weight, preferably 80 to 95% by weight, particularly preferably about 90% by weight, and a water-absorbing filler is included. Not more than 15% by weight, preferably 10% by weight or less, particularly preferably 5% by weight or less, and the water-repellent agent is 1 to 50% by weight, preferably 5 to 15% by weight, particularly preferably Is about 5 to 10% by weight. Further, when a rat-controlling agent is contained, the compounding ratio of the rat-controlling agent is about 0.05 to 5% by weight, preferably about 0.1 to 2% by weight, particularly preferably about 0.2% by weight as cycloheximide.

〔Example〕

Hereinafter, the rat-proof electric wire of the present invention will be described based on embodiments.

The drawings show an embodiment of the present invention, and the illustrated rat-proof electric wire is a single-core structure electric wire. In the rat-proof electric wire of the present embodiment, an insulating layer 2 made of PVC or a PVC copolymer, polyethylene, cross-linked polyethylene, etc., a sheath 3 made of at least polyvinyl chloride, and a rat-proofing agent are formed on a conductor core 1 made of copper or the like. A skin layer 4 made of the microencapsulated cycloheximide and the above-mentioned component and a waterproof layer 5 made of the above-mentioned material are provided in this order. This example has the simplest structure as an electric wire.

Note that the multi-core electric wire also has a structure similar to the above-mentioned single-core electric wire, but in both cases of single-core and multi-core, the outermost layer is a waterproof layer, and a skin layer and a sheath are provided inside the waterproof layer. It is the most general and preferable embodiment to arrange the multi-core electric wires which are arranged and insulated and covered with a waterproof layer, a skin layer and a sheath.

Examples 1 to 4 and Comparative Examples 1 and 2 As examples, wires having a waterproof layer, a skin layer made of the above-mentioned components including microencapsulated cycloheximide, and a sheath were prepared.

As a comparative example, an electric wire having substantially the same structure was prepared.
However, other components of the skin layer and components of the sheath are as described, except that the skin layer contains microencapsulated cycloheximide.

In both cases, the wall material and size of the microcapsules and the amount of microencapsulated cycloheximide used were the same. The conductor core is the same material (copper), and the sectional area of the conductor core is 2.0 mm ² , the thickness of the insulating layer is 0.8 mm, and the thickness of the sheath, the skin layer and the waterproof layer is as described.

Using the 30 cm long sample wires of the above Examples and Comparative Examples, both ends of the sample wire were sealed with epoxy resin so that water did not enter from both ends, and the temperature was set at each temperature in the table. After being immersed in water for 216 hours, the residual ratio of the anti-rat agent in the skin layer was measured, and the results are shown in Table I.

[Effects of the Invention] As described above, in the rat-proof electric wire of the present invention, the outermost layer is a waterproof layer, and the skin layer disposed inside the waterproof layer is made of a specific component including microencapsulated cycloheximide. Even if it gets wet with rainwater, the rat-proof effect lasts for a long time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of a rat-proof electric wire according to the present invention. 1: Conductor core wire 2: Insulation layer 3: Sheath 4: Skin layer 5: Waterproof layer

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-225408 (JP, A) JP-A-60-39609 (JP, A) JP-A-60-258807 (JP, A) JP-A 63-225807 225643 (JP, A) JP-A-63-225640 (JP, A) JP-A-103120 (JP, U) JP-A-59-95523 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] 1. A conductor core wire, a sheath existing on the surface side of the core wire, a skin layer existing on the surface side of the sheath, and a waterproof layer as an outermost layer, wherein the sheath is at least polyvinyl chloride or a polyvinyl chloride copolymer. Wherein the skin layer comprises at least polyvinyl chloride or a polyvinyl chloride-based copolymer, microencapsulated cycloheximide, and 1% to 50% by weight of a water repellent based on the total composition forming the skin layer. A rat-proof electric wire characterized by not containing a water-absorbing filler. 2. A conductor core wire, a sheath existing on the surface side of the core wire, a skin layer existing on the surface side of the sheath, and a waterproof layer as an outermost layer, wherein the sheath is at least polyvinyl chloride or a polyvinyl chloride copolymer. Wherein the skin layer comprises at least polyvinyl chloride or a polyvinyl chloride-based copolymer, microencapsulated cycloheximide, and 1% to 50% by weight of a water repellent based on the total composition forming the skin layer. A rat-proof electric wire comprising 15% by weight or less of a water-absorbing filler in the whole composition forming a skin layer.