WO1996020487A1

WO1996020487A1 - Covered conductor structure

Info

Publication number: WO1996020487A1
Application number: PCT/JP1995/002752
Authority: WO
Inventors: Masumi Tanikita
Original assignee: Polyplastics Co., Ltd.
Priority date: 1994-12-28
Filing date: 1995-12-28
Publication date: 1996-07-04
Also published as: CN1141687A; CN1138281C; JP3419781B2

Abstract

A covered conductor structure that is protected from damages caused by rat's bite and has such a suitable flexural modulus as to improve the efficiency of operations such as wiring. It has around the conductor a covering layer comprising a polyacetal resin or a polyacetal-base resin comprising a composition of a polyacetal resin as the principal component with other resin(s), for example, a composition of a polyacetal resin with a thermoplastic polyurethane resin and/or a core-shell polymer. It is preferable that the polyacetal-base resin has a flexural modulus ranging from 500 to 3,000 MPa and the covering layer has a thickness of 0.3 mm or above.

Description

Description Title of the invention Field of covered wire technology

The present invention has a structure i in which a conductive wire is provided with an S 被 made of a polyacetal resin.The resin property of the polyacetal resin prevents biting by a rat, that is, a member of the conductive wire, and has an appropriate bending elastic modulus. O Background technology for covered conductor structures with improved m 作 efficiency

Rat harm is frequent in modern society, regardless of whether it is pm or ¾¾F. For example, as a bite, buildings and the like can be damaged by teeth or become infected with pathogenic bacteria ^^, which can be a source of fouling, which has a large effect. Of these, damage caused by teeth inside and outside the building, such as electric wires and optical cables, may cause power outages, electric leakage fires, and gas explosions, causing the communication network to stop functioning, signal facilities to malfunction, and This causes the cause of the function change, and its influence is enormous.

Conventionally, chemical and mechanical methods have been used as a countermeasure against rats. Examples of such a chemical method include a method in which a paint containing a rat-proofing agent is applied to a conductor coating layer, and a method in which a thermoplastic resin or synthetic rubber containing a rat-proofing agent is used for an intermediate layer or a hire. In addition, as a mechanical method, there is a method of covering the entire surface of the conductive wire with a metal film by using a metal tape.

However, in the chemical method, since the rat-controlling agent is effective for humans and animals, it may give a bad effect to a conductor manufacturing worker and a wiring worker. In addition, paints containing rat-proofing agents, thermoplastic resins, and synthetic rubbers, whose ^ ¾ component gradually decreases over time, are not suitable for long-term control of rat harm, but on the other hand, pose a problem of environmental pollution. There is also. In addition, there is a problem that the price of the anti-rat agent may impair economic rationality. You. In addition, in the mechanical method, 锖 may be caused by the change of the metal material, and the weight of the coated conductor structure may increase due to the weight of the metal, which may cause problems such as a decrease in workability. . In addition, the use of stainless steel staking prevention metal <The economical rationality in terms of price is a problem similar to the chemical method. Disclosure of the invention

The present inventors have conducted a thorough study in view of the current situation of rodent bite of the covered wire, and as a result, when the polyacetal resin layer was used as the cover layer of the wire, the above problems were solved, The present inventors have found that a coated conductor structure with improved ^ rn efficiency can be obtained by avoiding the above problem, and the present invention has been accomplished. That is, the present invention provides a covered conductor structure characterized in that a covering layer having a polyacetal resin layer is provided outside the conductor. Further, the coated conductive wire structure is characterized in that the polyacetal resin layer is made of a polyacetal resin or is made of another material mainly composed of a polyacetal resin. . Further, the other resin to be blended with the polyacetanol resin is not particularly limited, but it is particularly preferable to provide the above-mentioned coated conductive wire structure characterized by being a thermoplastic polyurethane resin and Z or a core polymer. . Further, the present invention provides the above-mentioned covered conductor structure, wherein a polyacetal resin layer and a polyvinyl chloride resin layer are in contact with each other to form an SJ1 to be covered. Further, the present invention provides the above-mentioned coated wire structure, wherein the coating layer is composed of two layers of a polyvinyl chloride resin layer having a polyvinyl chloride resin layer as an outermost layer and a polycarbonate resin layer. . Further, the present invention provides the above-mentioned covered conductor structure, wherein the covering layer comprises at least two layers of a polyacetal resin layer having a polyacetal resin layer as an outermost layer and a polyvinyl chloride resin layer. In addition, the coating layer has a polyvinyl chloride resin layer as an outermost layer, an intermediate layer is a polyacetal resin layer, and an inner layer that contacts a conductor is a low-density polyethylene resin layer or a polyvinyl chloride resin layer. A conductive wire structure is provided. Further, the present invention provides an E-coated S lead wire structure in which the coating layer is a polyacetal resin layer as the outermost layer, the intermediate layer is a polyvinyl chloride resin layer, and the inner layer in contact with the conductor is a low-density polyethylene resin. is there. The thickness of the polyacetal resin layer is 0.3 mm or more, and the flexural modulus of the polyacetal resin is in the range of 500 to 300 MPa (megapascal). The present invention provides any one of the above-described coated conductive wire structures. Further, the present invention provides the above-mentioned coated conductive wire structure, which is used for preventing rat bite. In the present invention, the term "polyacetal-based resin" refers to both a polyacetal resin and a compound containing a polyacetal resin as a main component and a compounding agent that can be added to the polyacetal resin. BEST MODE FOR CARRYING OUT THE INVENTION

The conducting wire of the coated conducting wire structure of the present invention transmits light and electricity, and may be of any material and shape. For example, glass fiber for an optical cable, various metal wires for an electric or migrating circuit, etc. can do. The covered conductor structure according to the present invention is provided with a conductor made of a polyacetal resin on each of these conductors.

The covered conductor structure of the present invention has at least one covering layer of a polyacetal-based resin layer, and can hire a covering of another material as necessary. For example, it is difficult to form a coating layer made of a flame-resistant material or material on the coating layer, or a coating layer made of a material for protecting conductive wires, an insulating layer, or the like can be laminated on the lowermost layer of the coating. There is no particular limitation on the material of hired employees. In addition, an adhesive can be provided depending on the length so that the contact with the polyacetal resin layer can be maintained. In addition, polyacetal resin can be employed by normal extrusion, or polyacetal resin and its composition! The I »tape may be formed by winding the tape, or the tape may be stitched. In addition, polyvinyl chloride resin When the S1 is formed by coating the polyacetal-based resin layer with the resin, since the vinyl chloride resin has good adhesiveness with the polyacetal resin, it is necessary to improve the enemies of the entire δ-conductor structure. "it can. In particular, when ¾ϋ is a mm conductor, the covering layer is a polyvinyl chloride resin layer as an outermost layer, a polyacetal resin layer is an intermediate layer, and an inner layer is an insulating layer of a polyvinyl chloride resin layer or a low-density polyethylene resin. If a coated conductor structure is used as a layer, it will be even safer when wired inside a building because it has the strength, properties and insulation properties of vinyl chloride resin.

The following polyacetal resin can be used for the polyacetal resin layer of the coated conductor structure of the present invention. The i.e. polyacetal resin, rather I if a polymer compound as a main structure Fij ^ position the O Kishimechiren group (one CH ₂ 0-), polyoxymethylene homopolymer, containing other structural units in addition Okishimechiren group Either Kobolima, Yuichi Volima or Block Volima can be used. Further, the molecule may have a branched or crosslinked structure as well as a hindrance. Further, the polyacetal resin layer is formed from a polyacetal resin or a composition containing a polyacetal resin, and is preferably formed from a composition mainly composed of a polyacetal resin and containing another resin as a so-called island structure or stitch structure. . By blending other resins in this way, it is possible to avoid rat bite, to increase the flexural modulus of the polyacetal resin layer, and to improve the operability during embedding and wiring of the covered conductor structure. it can. There are no particular restrictions on the other resins to be blended with the polyacetal resin, such as thermoplastic polyurethane resins, core-shell polymers, polyester elastomers, polyamide elastomers, acryl-based resins such as ABS resins, ethylene-vinyl acetate copolymers, Vinyl acetate resin, alpha-olefin and α,; olefin resin such as copolymer of glycidyl ester of 5-unsaturated acid, vinyl chloride resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polycarbonate A resin, a polyphenylene ether resin, a boriphenylene sulfide resin, or the like can be used. Particularly, a thermoplastic polyurethane resin and Z or a core-shell polymer resin are preferable. Here, the core-shell polymer is It is an organic compound having a core of a soft bolimer and a seal of a glassy bolimer, and can be prepared by a known method, or a commercially available product can be used. The core shell polymer can be obtained by a multistage emulsion polymerization method in which a rubbery polymer serving as a core is sequentially coated with a polymer formed in a subsequent polymerization step to form a shell. As the core of the rubbery polymer, for example, a polymer obtained by polymerizing a conjugated gen or an alkyl acrylate or a mixture thereof can be mentioned. For the polymerization, a copolymerizable monomer can be copolymerized. Examples of the glassy polymer forming the shell include those obtained by copolymerizing methyl methacrylate alone or a mixture of methyl methacrylate and a monomer copolymerizable therewith. Then, an intermediate layer may be present between the core of the rubbery polymer and the shell of the glassy polymer.

The polyacetal resin may contain various kinds of antiblocking agents, antioxidants, ultraviolet absorbers, etc., an antistatic agent, a flame retardant, a flame retardant auxiliary, a dye and a pigment, as long as the effects of the present invention are not impaired. It is also possible to mix a coloring agent, a lubricant, a plasticizer and a crystallization accelerator, a crystal nucleating agent, a release agent, and a filler.

The polyacetone resin layer of the present invention has a thickness of at least 0.3 mm, and a flexural modulus of the polyacetyl resin within the range of 500-3, OOOMPa. . Force of the polyacetal resin layer being 0.3 mm h <A preferable reason is that if it is less than 0.3 mm, the polyacetal resin with a low flexural modulus is used, and the polyacetal resin is hired by the mouse. This is because power may be damaged, and it is particularly preferable that the thickness be 0.5 mm or more.

Further, the curvature of the polyacetal-based resin is more preferably in the range of 500 to 1.5 OOMPa. When the flexural modulus is in this range, it is possible to prevent the wire from being damaged by the rat's teeth, and to secure the mif workability of bending and bending the covered wire structure when laying it. .

The flexural modulus is measured by using a test piece in accordance with ASTM D790 from a polyacetal resin constituting the above-described covered conductor structure. In addition, Polya In the case where the cetal resin is formed by winding the tape-shaped polyacetal resin around the conducting wire several times, or when the tape force is << stitched, the above method for measuring the polyacetal resin constituting these is used. The flexural modulus according to the method is measured.

A low-density polyethylene resin, a polyacetal resin composition having a flexural modulus of 73.5 MPa, and a vinyl chloride resin were co-extruded to form a low-density polyethylene resin layer (inner layer) having a thickness of l mm and a polyacetal resin layer. A hollow cable with an outer diameter of 1 Omm with a thickness of 0.5 mm (intermediate layer) and a thickness of 1.5 mm of vinyl chloride resin layer (outside) has been produced. It was good.

FIG. 1 is a cross-sectional view showing a typical structure of the covered conductor structure of the present invention, and the present invention is not limited to such a force.

The covered conductor structure of the present invention can be manufactured by various known methods. For example, by supplying a core wire to an extruder, melt itl-type polyacetal resin or its curl around the core material alone or by coextrusion with another resin! You can do it. Alternatively, it can be produced by winding a core-shaped tape-shaped stitch (or tape-shaped) made of a polyacetal resin or a composition thereof. Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited to these examples.

(HS Example 1)

In order to examine the bite bite of the covered wire structure of the present invention by a rat by a standard test method, female and female rats of about 2 months of age were placed in separate cages, one for each, and feed and water were supplied. Gave. A test piece of polyvinyl chloride resin (6 cm long x 1.2 cm wide x 6 mm thick, approx. 6-7 g) pre-weighed in each cage and a polyacetal resin ( Specimen of polyacetal resin yarn (6 cm long x 1.2 cm wide x 6 mm thick, approx. 6 to 7 g) using "Zyuracon" manufactured by Boriblastics Co., Ltd. And two pieces each were put in pairs. The test piece in the cage was left as it was, and was taken out one week later. I weighed it. In addition, the aim of forcibly promoting galling ½, good rats! | 掛け Multiply some honey on each lOg ^ *! I did. Table 1 shows the results. Table

(Example 2)

The effect of the thickness of the polyacetal resin layer on rat bite was examined. Female and female Wistar rats, approximately 2 months old, were placed in separate cages, one each, and fed and watered. In each cage, a high-quality polyvinyl chloride resin (curvature ratio: 300 MPa) is laminated with difficulty, and a polyacetanol-based resin layer shown in Table 1-2 is applied to the outside employment by 0.2 mm and 0.3 mm. The S-conductor structure having a thickness of 0.5 mm and a thickness of 0.5 mm, respectively, was inserted. Covering in cage ¾ϋ The structure was left as it was and taken out one week later, and observed for galling. The results are shown in Table 1-2. The symbols in the table indicate that X is torn off, rum is toothed, and 〇 indicates no toothed. Table 1 2

(Test results)

Tables 1 and 2 Polyvinyl chloride 1 supplied for force, etc. Each piece of the product is made of a polyacetal-based resin that is severely gnawing irrespective of its thickness! All of the pieces weren't gnawing at all without their tooth shape. In addition, even when other resins are blended as a polyacetal resin layer, if the polyacetal resin layer in the S-conductor structure is 0.3 mm or more, it is likely to be picked by a rat. No tearing was observed.

Industrial use ^

As described in detail above and as is apparent from Wei's example, according to the covered wire structure of the present invention, damage to the wire due to rat bite can be avoided, and since the wire has an appropriate flexural modulus, ^ Etc. H¾ rate is also improved. In addition, it has been adopted in It is more effective than other chemical or mechanical means and has economic relevance. Brief description of

FIG. 1 shows a cross-sectional view of a typical structure of the covered conductor structure of the present invention.

Claims

Claims l. A covered conductor structure characterized in that a Si to be formed of a polyester resin is provided outside the conductor.

2. The coated conductor structure according to claim 1, wherein the polyacetal resin layer is made of a force made of a polyacetal resin, or made of fiX with another resin mainly composed of a polyacetal resin.

3. The coated conductor structure according to claim 2, wherein the polyacetal-based resin comprises a polyacetal resin, a thermoplastic polyurethane resin, and Z or a core-shell polymer.

4. The coated conductor structure according to claim 2, wherein the boria acetal resin layer and the polyvinyl chloride resin layer are in contact with each other to form a coating.

5. The coated conductor structure according to claim 3, wherein the sheath is formed by contacting the polyacetal-based resin layer and the polyvinyl chloride resin layer.

6. The coated conductive wire structure according to claim 4, wherein the coating comprises at least two layers of a polyvinyl chloride resin layer having a polyvinyl chloride resin layer as an outermost layer and a polyacetal resin layer.

7. The coated conductor structure according to claim 5, wherein the coating layer is composed of at least two layers of a polyvinyl chloride resin layer having a polyvinyl chloride resin layer as an outermost layer and a polyacetal resin layer.

8. The coated lead wire structure according to claim 4, wherein the coating is composed of two layers of a polyacetate-based resin layer having a polyacetal-based resin layer of about 5 layers and a polyvinyl chloride resin layer.

9. The method according to claim 5, wherein the SJ1 comprises two layers Ji of a polyacetal-based tree Bg layer and a polyvinyl chloride resin layer having a boron-based resin layer as a layer. Insulated conductor structure.

1 0. The SJ1 receives the polyvinyl chloride resin layer as the outermost layer, and the middle layer 5. The covered conductor structure according to claim 4, wherein the conductor layer is a resin-based layer, and the inner layer in contact with the conductor is a low-density bolylene resin layer or a polyvinyl chloride resin layer.

11. The outermost layer is a polyvinyl chloride resin layer, the intermediate layer is a polyester resin layer, and the inner layer in contact with the conductor is a low-density polyethylene resin layer or a polyvinyl chloride resin layer. The S-conductor structure described in the above.

1 2. The SJ1 to be used is a layer of a polyacetal resin, the intermediate layer is a layer of polyvinyl chloride resin, and the inner layer in contact with the conductor is a low-density polyethylene resin layer or a polyvinyl chloride resin layer. Covered wire structure.

1 3. The SI1 is a polyacetal-based resin layer, the intermediate layer is a polyvinyl chloride resin layer, and the inner layer in contact with the conductor is a low-density polyethylene resin layer or a polyvinyl chloride resin layer. S-conductor structure.

1 4. The claim characterized in that the thickness of the polyacetal resin is 0.3 mm or more, and the flexural modulus of the polyacetal resin is in the range of 500-3, OOOMPa. 14. The covered conductor structure according to any one of 1 to 13.

15. The coated wire structure according to any one of claims 1 to 13, which is used for preventing rat bite.