JP7219884B2 - wire support member - Google Patents

Description

TECHNICAL FIELD The present invention relates to a wire support member erected to prevent hanging of wires when an overhead wire breaks. More particularly, it relates to a wire support member having both flame retardancy and durability.

Conventionally, when overhead wires are broken due to lightning strikes, strong winds, snowfall, etc., fatigue breakage, stress corrosion breakage, or breakage due to power distribution work accidents, electric shock hazards occur when charged wires fall to the ground or sag. There was concern that man-made disasters such as Therefore, fall prevention members have been proposed to prevent disasters caused by falling wires (Patent Documents 1 and 2).

Patent Document 1 discloses an aerial insulated wire with support wire, which is characterized by spirally winding a support wire formed by applying an insulating coating on a chemical fiber string with high tensile strength and good heat resistance around the insulated wire. is proposed.

In Patent Document 2, in an overhead distribution line in which an overhead insulated wire is supported by a support, a wire fall prevention wire is spirally formed on the outer circumference of the overhead insulated wire installed on the support over almost the entire length of the overhead insulated wire. An overhead distribution line has been proposed, which is characterized in that it is wound and fixed to a support or an overhead insulated wire at both ends. discloses a product obtained by extrusion coating a coating layer of an olefin resin.

Public Utility Model Showa 56-100816 JP-A-2002-281649

However, in the invention described in Patent Document 1, since a support wire with an insulating coating on the core material of chemical fiber is used, the support wire burns down due to the spread of fire due to a lightning strike or a short circuit at the time of disconnection, and the overhead wire burns down. It could have fallen to the ground.

In addition, in the invention described in Patent Document 2, since aramid fibers or the like having aromatic rings are used as the core wire, it is presumed that the flame retardance of the wire is high to some extent. According to the above, when a wire having a coating layer is repeatedly subjected to strong external force such as abrasion during use, the coating layer cracks, cracks, and peels off, exposing the core wire, and the strength and weather resistance are likely to decrease. There was a problem of low

The present invention has been accomplished as a result of studies aimed at solving the problems in the conventional arts described above. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a wire support member that is resistant to the spread of fire when ignited by lightning strikes, short circuits, etc., and has high durability.

In order to achieve the above objects, according to the present invention, there is provided an electric wire support member made of a continuous spiral polyester resin wire, wherein the polyester resin wire is exposed to oxygen during a combustion test measured according to the JIS L1091E method. The wire supporting member has an index of 26 or more and a tensile strength of 3,000 to 10,000 N after a vibration test measured by the following evaluation method.
[Tensile strength after vibration test]
(1) Vibration test A sample length of 2 m in a state where the continuous spiral polyester resin wire is stretched so that the inner diameter of the spiral is 20 mm, and both ends of the polyester resin wire are fixed to a fixing jig. The center portion between the fixing jigs of the polyester resin wire is connected to a vibration tester, and the polyester resin wire is vibrated 10 million times at an amplitude of 5 mm and a frequency of 20 Hz in a direction perpendicular to a straight line connecting the fixing jigs.

P=π(D ₀ ² −20 ² ) ^1/2
P: Spiral pitch [mm] at which the inner diameter of the spiral is 20 mm
D ₀ : Inner diameter of spiral in non-stretched state [mm]
(2) Tensile test After the vibration test, the untensioned polyester resin wire removed from the fixture was cut to a length of 500 mm. Tensile test is performed under the conditions of , and the strength when the sample breaks is taken as the tensile strength after the vibration test.

In the wire supporting member of the present invention,
The polyester-based resin wire contains 0.08 to 1% by mass of a phosphorus compound in terms of phosphorus atoms,
The terminal carboxyl group concentration of the polyester resin constituting the polyester resin wire is 5 to 40 equivalents/ton,
The polyester-based resin wire has a non-circular cross section and is twisted in the longitudinal direction;
The polyester resin contained in the polyester resin wire contains 0.01 to 1% by mass of a polycarbodiimide compound,
are both preferable conditions, and when these conditions are satisfied, even better effects can be obtained.

In the vibration test, the sample length refers to the distance between both ends of the spiral. A state in which the inner diameter of the spiral is extended to 20 mm can be obtained by setting the pitch of the spiral to a length calculated from the following formula (I). ... (I)
P=π(D ₀ ² −20 ² ) ^1/2 (I)
P: Spiral pitch [mm] at which the inner diameter of the spiral is 20 mm
D ₀ : Inner diameter of spiral in non-stretched state [mm]
Formula (I) is a calculation in which the thickness of the polyester resin wire is approximated to 0, but the diameter of the polyester resin wire used for the electric wire support member and the inner diameter of the spiral in the non-stretched state are usually 3 to They are about 10 mm and 40 to 400 mm, and the effect of the above approximation on the measured values can be ignored. Here, the term "unstretched state" refers to a state in which the spiral is compressed and the gap between the polyester resin wires is minimized.

In the tensile test, the polyester resin wire in a non-tension state refers to the polyester resin wire after 24 hours after the polyester resin wire has been removed from the fixture after the vibration test and left to stand horizontally.

According to the present invention, it is possible to obtain a wire supporting member that does not easily spread fire when ignited by a lightning strike or a short circuit due to disconnection, and has high durability.

FIG. 1 is a schematic diagram showing an example of the wire supporting member of the present invention when it is not stretched. FIG. 2 is a schematic diagram showing an example of the state of an overhead wire using the wire support member of the present invention. 3A and 3B are schematic diagrams for explaining a method for measuring dimensions when the wire supporting member of the present invention is erected. FIG. 4 is a schematic diagram showing an example of the polyester-based resin wire used in the present invention.

The wire supporting member of the present invention is a wire supporting member made of a continuous spiral polyester-based resin wire,
The polyester resin wire has an oxygen index of 26 or more during a combustion test measured according to the JIS L1091E method, and a tensile strength of 3000 to 10000 N after a vibration test measured by the following evaluation method. is.
[Tensile strength after vibration test]
(1) Vibration test A sample length of 2 m in a state where the continuous spiral polyester resin wire is stretched so that the inner diameter of the spiral is 20 mm, and both ends of the polyester resin wire are fixed to a fixing jig. The center portion between the fixing jigs of the polyester resin wire is connected to a vibration tester, and the polyester resin wire is vibrated 10 million times at an amplitude of 5 mm and a frequency of 20 Hz in a direction perpendicular to a straight line connecting the fixing jigs.

Here, the sample length refers to the distance between both ends of the spiral. A state in which the inner diameter of the spiral is extended to 20 mm can be obtained by setting the pitch of the spiral to a length calculated from the following formula (I). ... (I)
P=π(D ₀ ² −20 ² ) ^1/2 (I)
P: Spiral pitch [mm] at which the inner diameter of the spiral is 20 mm
D ₀ : Inner diameter of spiral in non-stretched state [mm]
(2) Tensile test After the vibration test, the untensioned polyester resin wire removed from the fixture was cut to a length of 500 mm. Tensile test is performed under the conditions of , and the strength when the sample breaks is taken as the tensile strength after the vibration test.

By adopting such a configuration, it is possible to obtain a wire supporting member that does not easily spread fire when ignited due to a lightning strike or a short circuit due to disconnection, and has high durability.

The electric wire support member is installed to prevent the electric wire from hanging down when the overhead electric wire is broken. A specific example will be described based on the drawings, but the present invention is not limited only to the embodiment shown in the drawings. FIG. 1 is a schematic diagram showing an example of the wire supporting member of the present invention when it is not stretched. As shown in FIG. 1, the electric wire supporting member 1 of the present invention has a continuous helical shape of a polyester-based resin wire, which will be described later. By having such a form, it has stretchability. Such a wire support member 1 is stretched to a length corresponding to one span between utility poles when it is used for an overhead wire 2 from a no-load, non-stretched state before it is used for erection work. 2 shows the state of an overhead wire. As a method of fixing both ends of the wire support member 1 of the present invention, the wire support member 1 may be connected to the overhead wire via a sleeve, or may be directly fixed to the utility pole 3 or the like by a clamp or the like without the sleeve. .

The overhead electric wire 2 is inserted into the spiral loop of the electric wire support member 1 and is suspended between the utility poles, and the electric wire support member 1 extends over one span between the utility poles. there is By inserting the wire support member 1 in a stretched state, the overhead wires 2 are suspended at regular intervals through the spiral loops of the wire support member main body. There are various methods for preventing the sagging of an overhead wire when the overhead wire is broken. It is possible to form all the suspension points for suspending the overhead wire 2 at regular intervals through the continuous spiral loop and to support the overhead wire 2 by only the operation of . Here, the term "continuous spiral" refers to a curved shape in which the polyester-based resin wire rotates many times in the direction perpendicular to the plane of rotation, and has at least 10 rotations.

The diameter and cross-sectional shape of the polyester-based resin wire constituting the wire supporting member, the inner diameter of the spiral, etc. may be appropriately selected according to the thickness of the overhead wire to be applied, and the details will be described later.

The wire rod constituting the wire supporting member 1 of the present invention is a polyester-based resin wire rod. These include mechanical properties that can support overhead power lines when they break, durability against friction and repeated deformation because they must be maintained over a long period of time, and weather resistance and light resistance because they are used outdoors. It was selected as a material that can satisfy these. The polyester resin used for the polyester resin wire is not particularly limited as long as it satisfies the above properties. Examples of thermoplastic polyester resins having heat shrinkability and heat fixability include polyethylene terephthalate, polypropylene terephthalate, and polybutylene terephthalate. , polyethylene naphthalate and polybutylene naphthalate. These may be used singly or as a mixture. Among them, polyester resins preferably have an intrinsic viscosity of 0.7 to 1.4 because they are inexpensive, have little deterioration over time, and are excellent in dimensional stability, toughness, and flexibility. There is a tendency that the higher the intrinsic viscosity, the higher the toughness of the polyester resin wire. From this point of view, the intrinsic viscosity is more preferably in the range of 0.9 to 1.4. The intrinsic viscosity is the intrinsic viscosity determined from the viscosity measured in an orthochlorophenol solution at 25° C., and is a value represented by [η].

Here, the polyester resin is a resin having a structure formed by dehydration condensation of a dicarboxylic acid and a glycol. will be referred to as the glycol component for convenience. The reason why the terms "dicarboxylic acid component" and "glycol component" are shown here for convenience is that they specify the structure of the polyester resin and do not limit the raw materials. The dicarboxylic acid component includes terephthalic acid, 2,6-naphthalenedicarboxylic acid, isophthalic acid, 1,4-cyclohexanedicarboxylic acid and the like. Glycol components include ethylene glycol, propylene glycol, tetramethylene glycol, 1,4-cyclohexanedimethanol and the like. A structure obtained by appropriately combining these dicarboxylic acid components and glycol components can be employed. In addition, part of the dicarboxylic acid component may be replaced with adipic acid, sebacic acid, dimer acid, isophthalic acid substituted with metal sulfonate, etc., and part of the glycol component may be replaced with diethylene glycol or the like. good too. Furthermore, a small amount of a component that introduces a branched structure, such as pentaerythrol or trimethylolpropane instead of the glycol component, or trimellitic acid, trimesic acid, or boric acid instead of the dicarboxylic acid component, may be contained. Further, polyester resins include aliphatic polyesters such as polylactic acid.

Among these, in the case of polyethylene terephthalate, in which 90 mol % or more of the dicarboxylic acid component is terephthalic acid and 90 mol % or more of the glycol component is ethylene glycol, the electric wire supporting member 1 obtained is less prone to characteristic changes due to environmental changes. It is suitable for excellent dimensional stability.

As the polyester resin wire, it is preferable to use a monofilament made of a polyester resin from the viewpoint of obtaining a wire supporting member having high strength and excellent weather resistance.

The polyester-based resin wire constituting the wire supporting member 1 of the present invention has an oxygen index of 26 or more during a combustion test measured according to the JIS L1091E method. Satisfying such a configuration makes it difficult for the fire to spread when the wire supporting member ignites due to a lightning strike, a short circuit due to wire breakage, or the like.

If the oxygen index is less than 26, the self-extinguishing property is inferior, and the possibility of fire spreading in case of fire increases, which is not suitable. From this point of view, the oxygen index during the combustion test measured according to the JIS L1091E method is preferably 28 or more, more preferably 30 or more. The upper limit of the oxygen index in the combustion test measured according to the JIS L1091E method is preferably 40 or less, although the higher the better. In order to obtain a polyester resin wire having an oxygen index exceeding 40, it is necessary to increase the amount of the flame retardant, etc., and as a result, the moldability tends to be poor and the mechanical properties tend to be poor.

The flame retardant used in the polyester resin wire constituting the wire supporting member 1 of the present invention is not particularly limited as long as it satisfies the above properties. % by mass is preferably included.

Flame retardancy is imparted by containing a phosphorus compound, and examples of the phosphorus compound include phosphorus-containing flame retardants that are generally used as flame retardants. Preferred examples include phosphonates, phosphinates, and phosphine oxides, but are not limited to these. Among these compounds, those with high heat resistance that do not cause decomposition or scattering during melt-kneading or melt-molding are preferred. is preferably used from Further, the polyester resin constituting the polyester resin wire used in the present invention may be a copolymer polyester resin obtained by copolymerizing the above phosphorus compound, or a mixture of the above copolymer polyester and a normal polyester resin. good.

The content of the phosphorus compound in the polyester-based resin wire is preferably 0.08 to 1% by weight of the phosphorus atom when the weight of the entire polyester resin wire is 100% by weight, and 0.4% by weight. ~0.9% by mass is more preferred. If the amount of phosphorus atoms exceeds 1% by mass, the moldability deteriorates, and even if a polyester resin wire is obtained, the mechanical properties and heat resistance of the polyester resin wire may not be sufficient. Conversely, if it is less than 0.08% by mass, the flame retardant effect may be insufficient.

The polyester resin wire used in the present invention has a tensile strength of 3000 to 10000 N after a vibration test measured by the following evaluation method.

[Tensile strength after vibration test]
(1) Vibration test A sample length of 2 m in a state where the continuous spiral polyester resin wire is stretched so that the inner diameter of the spiral is 20 mm, and both ends of the polyester resin wire are fixed to a fixing jig. The center portion between the fixing jigs of the polyester resin wire is connected to a vibration tester, and the polyester resin wire is vibrated 10 million times at an amplitude of 5 mm and a frequency of 20 Hz in a direction perpendicular to a straight line connecting the fixing jigs.
(2) Tensile test After the vibration test, the untensioned polyester resin wire removed from the fixture was cut to a length of 500 mm. Tensile test is performed under the conditions of , and the strength when the sample breaks is taken as the tensile strength after the vibration test.

A wire supporting member having high durability can be obtained by having a tensile strength within such a range after the vibration test. If the tensile strength after the vibration test is less than 3000 N, the strength and durability will be insufficient, and there will be a tendency for the material to easily deform due to repeated strong impacts such as strong wind and snowfall. Conversely, when the tensile strength exceeds 10000 N, cracking and fibrillation tend to occur. From this point of view, the lower limit of the tensile strength after the vibration test is preferably 3,500 N or more, more preferably 5,000 N or more, and the upper limit is preferably 8,000 N or less, and more preferably 6,500 N or less. The polyester resin wire constituting the electric wire supporting member 1 of the present invention can be obtained by a known melt spinning method, and the tensile strength of the polyester resin wire is controlled by the draw ratio at the time of manufacturing the polyester resin wire. can do.

The terminal carboxyl group concentration of the polyester resin constituting the polyester resin wire used in the present invention is preferably 5 to 40 equivalents/ton. Here, the terminal carboxyl group concentration is a value measured by the method described by Pohl in ANALYTICAL CHEMISTRY, vol.26, p.1614. When the terminal carboxyl group concentration of the polyester-based resin is 5 to 40 equivalents/ton, the decrease in the viscosity of the polyester-based resin during melting is suppressed, and when this is used for the electric wire supporting member, short-circuiting at the time of lightning strike or disconnection is suppressed. It is difficult for the fire to spread when ignited by, etc., and the effect of preventing secondary disasters such as burns due to molten drips can be enhanced.
On the other hand, if it exceeds 40 equivalents/ton, the hydrolysis resistance is low, and dripping may occur during combustion. From this point of view, it is more preferable that the terminal carboxyl group concentration of the polyester resin is 5 to 20 equivalents/ton.

The terminal carboxyl group concentration of the polyester-based resin can be lowered by melting the polyester-based resin and reacting an appropriate amount of a known compound such as a carbodiimide compound.

As the carbodiimide compound, for example, a polycarbodiimide compound having a repeating unit of alkyl-substituted phenylcarbodiimide can be used. As for the composition in this case, the polyester resin contained in the polyester resin wire preferably contains 0.01 to 1% by mass of the polycarbodiimide compound.

The polyester resin wire used for the electric wire supporting member of the present invention contains a small amount of various inorganic particles such as titanium oxide, silicon oxide, calcium carbonate, silicon nitride, clay, talc, kaolin and zirconic acid, and crosslinked polymers. , In addition to particles such as various metal particles, known antioxidants, sequestering agents, ion exchange agents, anti-coloring agents, weathering agents, various coloring agents, antistatic agents, waxes, various surfactants, various It may contain reinforcing fibers and various plasticizers.

The shape of the wire support member 1 of the present invention will be described with reference to FIGS. 1 and 3. FIG. FIG. 1 is a schematic diagram showing an example of the wire supporting member of the present invention when it is not stretched, and FIG. 3 is a schematic diagram for explaining the shape of the wire supporting member of the present invention when it is stretched. If the outer diameter W of the spiral of the wire support member 1 of the present invention when not extended is too small, it cannot be fitted onto a large-diameter overhead wire. The outer diameter W of the spiral when the wire supporting member is not stretched is preferably 50 to 400 mm. More preferably, it is in the range of 100-200 mm.

In addition, the smaller the pitch P of the spiral when the electric wire supporting member 1 is erected, the more suspension points there are for suspending the overhead electric wire 2, and the more the electric wire can be gripped when the overhead electric wire is broken. Therefore, the length of the wire support member 1 when extended can be extended to at least one span between the utility poles, thereby improving the installation workability. From these points of view, the ratio P/D between the spiral pitch P and the spiral inner diameter D when the wire supporting member 1 of the present invention is installed is preferably 5 to 65, more preferably P/D = 7 to 35. is in the range of When the P/D exceeds 65, the number of suspension points for suspending the overhead wire 2 is reduced, the gripping force is reduced, and the overhead wire tends to drop out of the wire support member and hang down when the wire is broken.

The shape of the polyester-based resin wire used for the wire support member 1 of the present invention will be described with reference to FIG. FIG. 4 is a schematic diagram showing an example of the polyester-based resin wire used in the present invention. The cross-sectional shape of the polyester resin wire used in the wire support member 1 of the present invention can be appropriately selected according to the usage environment, and includes, for example, circular, elliptical, flat, regular polygonal and irregular shapes. Various shapes such as polygons can be mentioned.

The diameter of the polyester-based resin wire is not particularly limited and may be appropriately selected according to the usage environment, but a diameter in the range of 3 to 10 mm can be preferably used. The diameter of the monofilament cross section in the present invention is defined as follows. In other words, it indicates the diameter of the shortest length in rectangular cross-section threads, square cross-section threads, and triangular cross-section threads.For example, in rectangular cross-section threads and square cross-section threads, It is the length of the shortest straight line among straight lines, and in a triangular cross-section thread, it is the length of a straight line that passes through the center of gravity of a triangle and extends vertically from one vertex to the opposite side.

Among them, when a stranded wire (1a in FIG. 4) is formed by twisting a polyester resin wire having a non-circular cross section to form a spiral ridge on the outer surface, the weight and use of the wire as a whole are reduced. Since excellent compressive strength can be obtained without increasing the size of the material, it is easy to bend and has a predetermined elongation, but it is difficult to break, so it has excellent durability, and it also has the effect of suppressing the adhesion of snow and the generation of wind noise. , can be preferably used as a wire support member.

There are no particular restrictions on the number of times the wire is twisted, and as the number of twists increases, elongation tends to increase. is preferably in the range of , and can be appropriately selected depending on the diameter of the cross section of the wire and the material. The number of twists of the wire is determined by firmly pinching both ends of the wire at intervals of 1 m, tensioning it to the extent that it does not bend, and rotating the wire at a specific position of the deformed cross section, for example, the vertex of the polygonal cross section with respect to the central axis of the wire (turns/m). can be evaluated with

Next, the method for manufacturing the wire supporting member 1 of the present invention will be described in detail.

The polyester-based resin wire constituting the wire support member 1 of the present invention does not need to use any special manufacturing equipment, and for example, a single-screw or twin-screw extruder-type melt extruder can be used. Conditions such as a resin temperature of 200 to 350° C., an extrusion pressure of 1 to 50 MPa, an extrusion nozzle hole diameter of 0.1 to 20 mm, and a spinning speed of 0.3 to 100 m/min can be appropriately selected.

The melt spun from each extruder is then passed through a short gas zone and subsequently introduced into a cooling medium where it is cooled and solidified. The cooling medium includes, for example, water and polyethylene glycol, but is not particularly limited as long as it can be easily removed from the surface of the wire and does not chemically and physically cause substantial changes.

In the case of a monofilament obtained by drawing a polyester-based resin wire, the undrawn wire that has been cooled and solidified is subjected to one-step heating or multi-step drawing in order to obtain a predetermined strength. The heat medium used at this time includes air, hot water, steam, polyethylene glycol, glycerin, and silicone oil. It is not particularly limited as long as it does not give.

The stretching conditions vary depending on the resin used, but it is preferable to stretch at a total stretching ratio of 3 to 7 times in order to obtain sufficient strength as a polyester-based resin wire. The total draw ratio as used herein is the product of the draw ratio in the first stage and the draw ratio at the time of re-stretching.

In either one-stage or multi-stage process, stretching is followed by relaxation heat treatment in a dry heat bath, and the temperature and relaxation heat treatment ratio can be appropriately selected depending on the resin used.

This relaxation heat treatment corrects the unstable structure inside the wire (horizontal strain, reduction in elongation, cracks) that occurred during the drawing process. After this relaxation heat treatment, the film is wound up after being coated with finishing oil, if necessary.

The wire once wound in this manner is unwound, run under tension, preheated to a temperature above the glass transition point of the wire and below the melting point of the wire, and then immediately wound around a rotating shaping shaft to obtain a continuous wire. It is possible to manufacture the wire support member 1 of the present invention, which is made of a helically shaped stretchable polyester-based resin wire.

The wire supporting member 1 of the present invention will be described below based on examples, but the wire supporting member 1 of the present invention is not limited to the following examples as long as the gist thereof is not exceeded.

In addition, the electric wire supporting member 1 and the polyester-based resin wire constituting the electric wire supporting member 1 in the examples were evaluated by the following methods.

[Fineness]
An initial load specified in JIS L1013:2010 was applied, four samples of exactly 500 mm were taken, the mass was measured, and the fineness was calculated by the following formula.

Fineness [dtex]=mass [g]×10000/2.

[Tensile strength]
According to JIS L1013: 2010 8.5.1, a sample cut to a length of 500 mm was left for 24 hours in a temperature and humidity control room at 20 ° C. and 65% RH, and then "Tensilon (registered trademark)" manufactured by Orientec Co., Ltd. ) Using a UTM-4-100 type tensile tester, measurement was performed under the conditions of a sample grip interval of 250 mm and a tensile speed of 300 mm/min to determine the tensile strength [N] when the sample was cut.

[Intrinsic viscosity of polyester]
25 mL of ortho-chlorophenol (hereinafter abbreviated as OCP) and 2 g±0.001 g of a resin sample of polyester are placed in a test tube prepared for dissolution. The test tube containing the sample is set in a dry block bath and heated at 100° C. for 30 minutes while the polyester resin sample is dissolved in OCP to obtain an OCP solution. After cooling this OCP solution in the test tube with running water for 15 minutes. , 20 mL of the OCP solution is measured with a whole pipette and collected in an Ostwald viscosity tube. The Ostwald viscosity tube containing the OCP solution was set in a constant temperature water bath adjusted to 25° C. and allowed to stand for 30 minutes. Then, the flow time of the OCP solution flowing down the Ostwald viscosity tube was measured according to a standard method to calculate the intrinsic viscosity.

[Terminal carboxyl group concentration]
Place 1 g of sample and 20 ml of o-cresol aqueous solution into a test tube prepared for dissolution. The test tube containing the sample is set in a dry block bath and heated at 100°C for 30 minutes to dissolve the resin sample. Titration was performed using a 1/25N sodium hydroxide/ethanol aqueous solution, and the terminal carboxyl group equivalent per ton of sample [equivalent/ton] was calculated from the titration amount of the 1/25N sodium hydroxide/ethanol aqueous solution required for titration. .

[Oxygen Index]
According to the JIS L1091E method, a sample cut to a length of 150 mm is vertically attached to a test piece support at a distance of 100 mm or more from the upper end of the combustion cylinder. Open the oxygen and nitrogen flow control valves to release the gases into the combustion cylinder for approximately 30 seconds before igniting the top of the sample. Determine the minimum oxygen flow rate and the nitrogen flow rate required for the sample to continue burning for 3 minutes or more, or for the burning length of 50 mm or more after ignition, and use the following formula to determine the oxygen flow rate. Find exponent. The test was performed three times, and the average value was calculated.

oxygen index = [O ₂ ]/([O ₂ ]+[N ₂ ])
[O ₂ ]: Flow rate of oxygen [liter/min]
[N ₂ ]: Flow rate of nitrogen [liter/min]
[material]
Using a rotary vacuum dryer, polyethylene terephthalate chips (manufactured by Toray Industries, Inc., amount of phosphorus atoms: 0.67% by mass, intrinsic viscosity: 0.75) copolymerized with a phosphorus compound are dried at a temperature of 110°C to a moisture content of 60 ppm or less. The chips that were dried to

Using a rotary vacuum dryer, polyethylene terephthalate chips (manufactured by Toray Industries, Inc., amount of phosphorus atoms: 0.67% by mass, intrinsic viscosity: 1.07) copolymerized with a phosphorus compound are dried at a temperature of 110°C to a moisture content of 60 ppm or less. The chips that were dried to

Polyethylene terephthalate chips obtained by solid phase polymerization of raw material A (manufactured by Toray Industries, Inc., amount of phosphorus atoms: 0.67% by mass, intrinsic viscosity: 1.20) were dried at a drying temperature of 110 ° C. until the moisture content became 60 ppm or less. and

Using a rotary vacuum dryer, polyethylene terephthalate chips (manufactured by Toray Industries, Inc., amount of phosphorus atoms: 0.85% by mass, intrinsic viscosity: 0.75) copolymerized with a phosphorus compound are dried at a temperature of 110°C to a moisture content of 60 ppm or less. The chips that were dried to

Using a rotary vacuum dryer, polyethylene terephthalate chips (manufactured by Toray Industries, Inc., amount of phosphorus atoms: 1.4 mass%, intrinsic viscosity: 0.75) copolymerized with a phosphorus compound are dried at a temperature of 110 ° C. to a moisture content of 60 ppm or less. The dried chips were used as raw material E.

Using a rotary vacuum dryer, polyethylene terephthalate chips (Titanium oxide content 0.1% by mass, intrinsic viscosity 1.21 manufactured by Toray Industries, Inc.) were dried at a drying temperature of 110 ° C. until the moisture content was 60 ppm or less. F.
Chips obtained by adding 20% by weight of carbon black to raw material D using a twin-screw extruder at a processing temperature of 285 ° C. are dried at a drying temperature of 110 ° C. until the moisture content is 550 ppm or less. bottom.
Polyethylene terephthalate chips (Stabaxol KE7646 manufactured by Rhein Chemie) containing 15% by mass of a polycarbodiimide compound (Stabaxol (registered trademark) P100 with an average molecular weight of 10000) are dried using a rotary vacuum dryer at a temperature of 110 ° C. and a moisture content of 350 ppm or less. A raw material H was obtained by drying the chips until the

[Example 1]
A mixed raw material obtained by blending the raw material A and the raw material G so that the blend ratio is shown in Table 1 is continuously supplied to a φ50 mm single-screw extruder-type melt extruder, and melt-kneaded at a temperature of 280 to 300 ° C., The undrawn yarn was spun through a spinneret and solidified by cooling in a hot water bath at 70°C. The polyethylene glycol was washed off, and a polyester-based resin wire having a triangular cross-sectional shape (1a in FIG. 4) was produced and wound around a bobbin.

Next, the once-wound polyester-based resin wire was unwound, preheated to a temperature of 80° C. or higher while running under tension, and immediately wound up on a rotating shaping shaft having a diameter of 100 mm. A wire supporting member formed into a continuous spiral with an outer diameter W of the spiral of 115 mm was produced by quenching the wound spiral material with running water while pressing it with a pressing roll. Table 1 shows the properties of the polyester-based resin wire and the wire supporting member thus obtained.

[Example 2]
A mixed raw material obtained by blending the raw material B and the raw material G so that the blend ratio is shown in Table 1 is continuously supplied to a φ50 mm single-screw extruder-type melt extruder, and melt-kneaded at a temperature of 280 to 300 ° C., The undrawn yarn was spun through a spinneret and solidified by cooling in a hot water bath at 70°C. The polyethylene glycol was washed off, and a polyester-based resin wire having a triangular cross-sectional shape (1a in FIG. 4) was produced and wound around a bobbin.

Next, the once-wound polyester-based resin wire was unwound, preheated to a temperature of 80° C. or higher while running under tension, and immediately wound up on a rotating shaping shaft having a diameter of 100 mm. A wire supporting member formed into a continuous spiral with an outer diameter W of the spiral of 115 mm was produced by quenching the wound spiral material with running water while pressing it with a pressing roll. Table 1 shows the properties of the polyester-based resin wire and the wire supporting member thus obtained.

[Example 3]
A mixed raw material obtained by blending raw material C, raw material F, and raw material G so that the blend ratio is shown in Table 1 is continuously supplied to a φ50 mm single-screw extruder-type melt extruder, and melt-kneaded at a temperature of 280 to 300 ° C. After that, the undrawn yarn is spun through a spinneret, cooled and solidified in a hot water bath at 70°C, stretched 4.0 times in a polyethylene glycol liquid bath at 150°C, and then washed with water to the surface of the monofilament. Adhering polyethylene glycol was washed off, and a polyester-based resin wire having a triangular cross section (1a in FIG. 4) was produced and wound around a bobbin.

Next, the once-wound polyester-based resin wire was unwound, preheated to a temperature of 80° C. or higher while running under tension, and immediately wound up on a rotating shaping shaft having a diameter of 100 mm. A wire supporting member formed into a continuous spiral with an outer diameter W of the spiral of 115 mm was produced by quenching the wound spiral material with running water while pressing it with a pressing roll. Table 1 shows the properties of the polyester-based resin wire and the wire supporting member thus obtained.

[Example 4]
A mixed raw material obtained by blending raw material C and raw material G at a blend ratio shown in Table 1 is continuously supplied to a φ50 mm single-screw extruder-type melt extruder, and melt-kneaded at a temperature of 280 to 300 ° C., The undrawn yarn was spun through a spinneret and solidified by cooling in a hot water bath at 70°C. The polyethylene glycol was washed off, and a polyester-based resin wire having a triangular cross-sectional shape (1a in FIG. 4) was produced and wound around a bobbin.

Next, the once-wound polyester-based resin wire was unwound, preheated to a temperature of 80° C. or higher while running under tension, and immediately wound up on a rotating shaping shaft having a diameter of 100 mm. A wire supporting member formed into a continuous spiral with an outer diameter W of the spiral of 115 mm was produced by quenching the wound spiral material with running water while pressing it with a pressing roll. Table 1 shows the properties of the polyester-based resin wire and the wire supporting member thus obtained.

[Examples 5, 7-8]
A mixed raw material obtained by blending raw material C, raw material G, and raw material H at a blend ratio shown in Table 1 is continuously supplied to a φ50 mm single-screw extruder-type melt extruder, and melt-kneaded at a temperature of 280 to 300 ° C. After that, the undrawn yarn is spun through a spinneret, cooled and solidified in a hot water bath at 70°C, stretched 4.0 times in a polyethylene glycol liquid bath at 150°C, and then washed with water to the surface of the monofilament. Adhering polyethylene glycol was washed off, and a polyester-based resin wire having a triangular cross section (1a in FIG. 4) was produced and wound around a bobbin.

Next, the once-wound polyester-based resin wire was unwound, preheated to a temperature of 80° C. or higher while running under tension, and immediately wound up on a rotating shaping shaft having a diameter of 100 mm. A wire supporting member formed into a continuous spiral with an outer diameter W of the spiral of 115 mm was produced by quenching the wound spiral material with running water while pressing it with a pressing roll. Table 1 shows the properties of the polyester-based resin wire and the wire supporting member thus obtained.

[Example 6]
A mixed raw material obtained by blending raw material C, raw material G, and raw material H at a blend ratio shown in Table 1 is continuously supplied to a φ50 mm single-screw extruder-type melt extruder, and melt-kneaded at a temperature of 280 to 300 ° C. After that, the undrawn yarn is spun through a spinneret, cooled and solidified in a hot water bath at 70°C, stretched 4.0 times in a polyethylene glycol liquid bath at 150°C, and then washed with water to the surface of the monofilament. Adhering polyethylene glycol was washed off, and a polyester-based resin wire having a triangular cross section (1a in FIG. 4) was produced and wound around a bobbin.

Next, the once-wound polyester-based resin wire was unwound, preheated to a temperature of 80° C. or higher while running under tension, and immediately wound up on a rotating shaping shaft having a diameter of 75 mm. A wire supporting member formed into a continuous spiral having an outer diameter W of 90 mm was produced by quenching the wound spiral material with running water while pressing it with a pressure roll. Table 1 shows the properties of the polyester-based resin wire and the wire supporting member thus obtained.

[Example 9]
A mixed raw material obtained by blending the raw material D and the raw material G so that the blend ratio is shown in Table 1 is continuously supplied to a φ50 mm single-screw extruder-type melt extruder, and melt-kneaded at a temperature of 280 to 300 ° C., The undrawn yarn was spun through a spinneret and solidified by cooling in a hot water bath at 70°C. The polyethylene glycol was washed off, and a polyester-based resin wire having a triangular cross-sectional shape (1a in FIG. 4) was produced and wound around a bobbin.

Next, the once-wound polyester-based resin wire was unwound, preheated to a temperature of 80° C. or higher while running under tension, and immediately wound up on a rotating shaping shaft having a diameter of 100 mm. A wire supporting member formed into a continuous spiral with an outer diameter W of the spiral of 115 mm was produced by quenching the wound spiral material with running water while pressing it with a pressing roll. Table 1 shows the properties of the polyester-based resin wire and the wire supporting member thus obtained.

[Example 10]
A mixed raw material obtained by blending raw material D, raw material G, and raw material H at a blend ratio shown in Table 1 is continuously supplied to a φ50 mm single-screw extruder-type melt extruder, and melt-kneaded at a temperature of 280 to 300 ° C. After that, the undrawn yarn is spun through a spinneret, cooled and solidified in a hot water bath at 70°C, stretched 4.0 times in a polyethylene glycol liquid bath at 150°C, and then washed with water to the surface of the monofilament. Adhering polyethylene glycol was washed off, and a polyester-based resin wire having a triangular cross section (1a in FIG. 4) was produced and wound around a bobbin.

Next, the once-wound polyester-based resin wire was unwound, preheated to a temperature of 80° C. or higher while running under tension, and immediately wound up on a rotating shaping shaft having a diameter of 100 mm. A wire supporting member formed into a continuous spiral with an outer diameter W of the spiral of 115 mm was produced by quenching the wound spiral material with running water while pressing it with a pressing roll. Table 1 shows the properties of the polyester-based resin wire and the wire supporting member thus obtained.

[Comparative Example 1]
A mixed raw material obtained by blending raw material C, raw material F, and raw material G so that the blend ratio is shown in Table 1 is continuously supplied to a φ50 mm single-screw extruder-type melt extruder, and melt-kneaded at a temperature of 280 to 300 ° C. After that, the undrawn yarn is spun through a spinneret, cooled and solidified in a hot water bath at 70°C, stretched 4.0 times in a polyethylene glycol liquid bath at 150°C, and then washed with water to the surface of the monofilament. Adhering polyethylene glycol was washed off, and a polyester-based resin wire having a triangular cross section (1a in FIG. 4) was produced and wound around a bobbin.

Next, the once-wound polyester-based resin wire was unwound, preheated to a temperature of 80° C. or higher while running under tension, and immediately wound up on a rotating shaping shaft having a diameter of 100 mm. A wire supporting member formed into a continuous spiral with an outer diameter W of the spiral of 115 mm was produced by quenching the wound spiral material with running water while pressing it with a pressing roll. Table 1 shows the properties of the polyester-based resin wire and the wire supporting member thus obtained.

[Comparative Example 2]
A mixed raw material obtained by blending the raw material E and the raw material G so as to have the blend ratio shown in Table 1 is continuously supplied to a φ50 mm single-screw extruder-type melt extruder, and melt-kneaded at a temperature of 280 to 300 ° C., The undrawn yarn was spun through a spinneret and solidified by cooling in a hot water bath at 70°C. The polyethylene glycol was washed off, and a polyester-based resin wire having a triangular cross-sectional shape (1a in FIG. 4) was produced and wound around a bobbin.

Next, the once-wound polyester-based resin wire was unwound, preheated to a temperature of 80° C. or higher while running under tension, and immediately wound up on a rotating shaping shaft having a diameter of 100 mm. A wire supporting member formed into a continuous spiral with an outer diameter W of the spiral of 115 mm was produced by quenching the wound spiral material with running water while pressing it with a pressing roll. Table 1 shows the properties of the polyester-based resin wire and the wire supporting member thus obtained.

As is clear from Table 1, the polyester-based resin wire and the wire supporting member used for the wire supporting member of the present invention are excellent in self-extinguishing properties, and have high tensile strength and durability after a vibration test assuming actual use. It had excellent properties.

On the other hand, those outside the scope of the present invention are difficult to obtain polyester resin wires that can be used for the wire support member of the present invention. there were.
That is, as described in Comparative Example 1, when the oxygen index during the combustion test was below the range of the present invention, combustion continued after ignition, resulting in poor self-extinguishing properties.

Moreover, as described in Comparative Example 2, when a wire support member having a tensile strength after the vibration test that was below the range of the present invention was attached to the overhead wire, deformation and breakage occurred.

According to the present invention, since it is possible to obtain a wire support member which is flame-retardant and can be easily attached to existing overhead wires, it can be used to prevent fatigue breakage and stress corrosion breakage due to lightning strikes, strong winds, snowfall, etc., and power distribution. It can be used for the purpose of preventing disasters caused by electric wires falling when disconnection occurs due to a construction accident.

REFERENCE SIGNS LIST 1 electric wire support member 1a polyester resin wire 2 overhead electric wire 3 utility pole W spiral outer diameter P spiral pitch D spiral inner diameter

Claims (4)

A wire support member made of a continuous spiral polyester resin wire, wherein the polyester resin wire contains 0.08 to 1% by mass of a phosphorus compound in terms of phosphorus atoms, and the polyester resin wire conforms to the JIS L1091E method. A wire supporting member having an oxygen index of 26 or more during a combustion test measured according to regulations, and a tensile strength of 3000 to 10000 N after a vibration test measured by the following evaluation method.
[Tensile strength after vibration test]
(1) Vibration test A sample length of 2 m in a state where the inner diameter of the spiral of the polyester resin wire in a continuous spiral is 20 mm, and both ends of the polyester resin wire are fixed to a fixing jig. The center portion between the fixing jigs of the resin wire is connected to a vibration tester, and the polyester resin wire is vibrated 10 million times at an amplitude of 5 mm and a frequency of 20 Hz in a direction perpendicular to a straight line connecting the fixing jigs.
(2) Tensile test After the vibration test, the untensioned polyester resin wire removed from the fixture was cut to a length of 500 mm. Tensile test is performed under the conditions of , and the strength when the sample breaks is taken as the tensile strength after the vibration test. 2. The wire supporting member according to claim 1, wherein the polyester resin constituting said polyester resin wire has a terminal carboxyl group concentration of 5 to 40 equivalents/ton. 3. The wire supporting member according to claim 1, wherein said polyester resin wire has a non-circular cross section and is twisted in the longitudinal direction. The wire supporting member according to any one of claims 1 to 3, wherein the polyester resin contained in the polyester resin wire contains 0.01 to 1% by mass of a polycarbodiimide compound.

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