JP2009099401A - Lead-in polyethylene insulated cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a twisted lead-in polyethylene insulated cable having high weatherability and flame retardancy. <P>SOLUTION: The low-pressure lead-in cable is manufactured by twisting one wire 12 in one black color layer structure and two wires 13, 14 in an identification color layer structure, together. An insulator 16 for the wire 12 in the black color layer structure is formed by containing metal hydroxide and by using polyethylene to be colored black. Meanwhile, insulators 18, 19 for the wires 13, 14 in the identification color layer structure is formed by containing the metal hydroxide and ultraviolet absorber in the polyethylene to be colored other than black. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lead-in polyethylene insulated wire.

  A low-voltage lead-in electric wire formed by twisting a plurality of electric wires is known as an electric wire drawn from an outdoor utility pole to the eaves of each house. The following Patent Document 1 discloses a technique of a low-voltage lead-in electric wire formed by twisting three electric wires.

In FIG. 4, a low-voltage lead-in electric wire (DVR electric wire) 1 disclosed in Patent Document 1 below is formed by twisting a first electric wire 2 and two second electric wires 3 together. Each of the three electric wires has an insulator made of a polyvinyl chloride resin on the surface. If it demonstrates concretely about each electric wire, the 1st electric wire 2 will cover the conductor 5 with the black insulator 4 which consists of a polyvinyl chloride resin. On the other hand, the second electric wire 3 covers a conductor 9 with an insulator 8 having a black inner layer 6 made of a polyvinyl chloride resin on the inside and a colored outer layer 7 made of a polyvinyl chloride resin on the outside on different colors. It has become. The low-voltage lead-in electric wire 1 disclosed in Patent Document 1 can identify each of the three electric wires.
JP 2006-54056 A (page 4, FIG. 1-2)

  Since polyvinyl chloride is a halogen-containing polymer, it has a problem that harmful gases such as hydrogen chloride are generated during combustion in a fire. For this reason, it is conceivable to apply polyethylene that does not generate harmful hydrogen halide gas to the insulator. However, if the insulator is polyethylene, there is a problem in that it will ignite when tracking occurs at the terminal portion.

  To further point out the problems in applying polyethylene to insulators, it is known that polyethylene has poor weather resistance. In particular, in the case of a lead-in wire that twists the wires, the green or blue insulator becomes brittle or thin due to ultraviolet deterioration due to long-term use. And finally, a crack is generated, leading to breakdown of the insulator due to a short circuit between phases, which is larger than the above problem.

  Inventors of the present application have found that insulators colored other than black become brittle due to UV degradation, and the superiority or inferiority of this UV degradation varies depending on the color to be colored. ing).

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a twisted-type lead-in polyethylene insulated wire having high weather resistance and flame retardancy.

  In order to solve the above-mentioned problems, the polyethylene insulated electric wire for lead-in of the present invention according to claim 1 comprises a black one-layer electric wire formed by coating a conductor with a black colored polyethylene insulator, and polyethylene. It is formed by twisting together an electric wire having an identification color 1-layer structure formed by coating a conductor with an insulator colored in a color other than black, or a different color from the electric wire having a black 1-layer structure. A plurality of the identification color single-layer electric wires are twisted together.

  According to the present invention having such characteristics, both the black one-layer structure electric wire and the identification color one-layer electric wire are weather-resistant electric wires. Even if the electric wire having the identification color 1-layer structure is colored other than black, it has weather resistance by blending an ultraviolet absorber. Therefore, it is possible to prevent the insulator from becoming brittle or thin due to ultraviolet deterioration. Thereby, even if the electric wire of a black 1 layer structure and the electric wire of an identification color 1 layer structure are twisted together, the insulator destruction by the short circuit between phases etc. is avoided. The electric wire having the identification color 1 layer structure can be identified even when a plurality of wires are used.

  In order to solve the above-mentioned problems, the drawn-in polyethylene insulated wire of the present invention according to claim 2 is a black one-layer structured wire obtained by covering a conductor with a black colored polyethylene insulator; Twisting an electric wire with a two-layer structure of distinctive color formed by coating a conductor with an insulator composed of an inner layer made of polyethylene colored and an outer layer colored with a UV absorber in addition to black. Or a wire having a black one-layer structure and a plurality of wires having a two-layer structure of distinguishing colors that are differently colored.

  According to the present invention having such a feature, both the black one-layer structure electric wire and the identification color two-layer structure electric wire are weather-resistant electric wires. The electric wire having the identification color two-layer structure has weather resistance similar to the inner layer by blending an ultraviolet absorber even if the outer layer of the insulator is colored other than black. Therefore, it is possible to prevent the insulator from becoming brittle or thin due to ultraviolet deterioration. Thereby, even if the electric wire of black 1 layer structure and the electric wire of identification color 2 layer structure are twisted together, the insulator destruction by the short circuit between phases etc. is avoided. The electric wire having the identification color two-layer structure can be identified even when a plurality of wires are used.

  The polyethylene insulated electric wire for lead-in of the present invention according to claim 3, which has been made to solve the above-mentioned problems, is an electric wire having a black one-layer structure in which a conductor is coated with a black-colored polyethylene insulator. The conductor is covered with an insulator composed of a polyethylene insulator body colored with an ultraviolet-absorbing agent in polyethylene and an identification stripe that is colored other than black and integrated with the outer surface of the insulator body. It is formed by twisting together the electric wires having the identification stripe-containing structure formed, or by twisting the electric wires having the black one-layer structure and a plurality of electric wires having the identification stripe-containing structure that are differently colored. Yes.

  According to the present invention having such characteristics, both the black one-layer structure electric wire and the identification stripe-containing electric wire are weather-resistant electric wires. The electric wire having the identification stripe-containing structure has the same structure as that of the electric wire having a black single layer structure, and has weather resistance. Moreover, even if the stripe for identification in the electric wire of an identification stripe containing structure is colored other than black, it has a weather resistance by mix | blending an ultraviolet absorber. Therefore, it is possible to prevent the insulator from becoming brittle or thin due to ultraviolet deterioration. Thereby, even if the electric wire of a black 1 layer structure and the electric wire of an identification stripe containing structure are twisted together, the insulator destruction by an interphase short circuit etc. is avoided. An electric wire having an identification stripe-containing structure can be identified even when a plurality of electric wires are used.

  The polyethylene insulated wire for lead-in of the present invention according to claim 4 is the polyethylene insulated wire for lead-in according to claim 1, wherein the insulator of the black one-layered wire is metal hydroxide with respect to 100 parts by weight of polyethylene. 1 to 150 parts by weight of the product, and the insulator of the electric wire having the identification color 1 layer structure is formed by blending 0 to 150 parts by weight of metal hydroxide with respect to 100 parts by weight of polyethylene. Yes.

  According to the present invention having such characteristics, the black one-layered electric wire insulator has a flame resistance by being mixed with a metal hydroxide in addition to being a weather-resistant part by making it black. . The reason why the upper limit of the amount of the metal hydroxide is 150 parts by weight is that if it exceeds 150 parts by weight with respect to 100 parts by weight of polyethylene, the tensile strength cannot be satisfied.

  As the metal hydroxide, any one of magnesium hydroxide, aluminum hydroxide, zirconium hydroxide, calcium hydroxide, and barium hydroxide, or a mixture of two or more types shall be used (this is an example). The same applies to other claimed inventions). In addition, carbon black is used to make the color black (this is an example. The inventions according to other claims are also the same).

  The electric wire having the identification color one-layer structure becomes a wire having weather resistance by blending the ultraviolet absorber, and has flame retardancy by blending the metal hydroxide. The reason why the upper limit of the amount of the metal hydroxide is 150 parts by weight is that if it exceeds 150 parts by weight with respect to 100 parts by weight of polyethylene, the tensile strength cannot be satisfied.

  The polyethylene insulated wire for lead-in of the present invention according to claim 5 is the polyethylene insulated wire for lead-in according to claim 2, wherein the insulator of the wire having the black one-layer structure is metal hydroxide with respect to 100 parts by weight of polyethylene. 0 to 150 parts by weight of the product, and the inner layer of the two-layer structure of the identification color electric wire comprises 0 to 150 parts by weight of metal hydroxide with respect to 100 parts by weight of polyethylene. The outer layer in the insulator of the electric wire having the identification color two-layer structure is characterized in that 10 to 300 parts by weight of a metal hydroxide is blended with 100 parts by weight of polyethylene.

  According to the present invention having such characteristics, the inner layer in the insulation of the electric wire having the distinction color two-layer structure becomes a weather-resistant portion by making it black, and is flame retardant by blending with a metal hydroxide. Have sex. The reason why the upper limit of the amount of the metal hydroxide is 150 parts by weight is that if it exceeds 150 parts by weight with respect to 100 parts by weight of polyethylene, the tensile strength cannot be satisfied.

  The outer layer in the insulator of the two-layered structure of the color of the identification color has flame resistance due to the blending of the metal hydroxide, in addition to being a weather-resistant portion by blending the ultraviolet absorber. The reason why the upper limit of the amount of the metal hydroxide is 300 parts by weight is that in the case of the outer layer, if it exceeds 300 parts by weight with respect to 100 parts by weight of polyethylene, the tensile strength cannot be satisfied. This is because the lower limit of 10 parts by weight considers the flame retardancy in the case of the outer layer.

  In addition, regarding the insulator of the electric wire of black 1 layer structure, it is the same as this invention of Claim 4.

  The lead-in polyethylene insulated wire of the present invention according to claim 6 is the lead-in polyethylene insulated wire according to claim 3, wherein the insulator of the black one-layer structure wire is metal hydroxide with respect to 100 parts by weight of polyethylene. 0 to 150 parts by weight of the product, and the insulator main body of the wire having the identification stripe-containing structure is formed by blending 0 to 150 parts by weight of metal hydroxide with respect to 100 parts by weight of polyethylene. The identification stripe of the electric wire having the containing structure is formed by blending 10 to 300 parts by weight of metal hydroxide with respect to 100 parts by weight of polyethylene, and the stripe width is 1/10 to 1 with respect to the entire circumference of the insulator body. It is characterized by being formed to / 4.

  According to the present invention having such a feature, the insulation body of the electric wire having the identification stripe-containing structure becomes a weather-resistant part by making it black, and flame retardancy is made by blending a metal hydroxide. Have. The reason why the upper limit of the amount of the metal hydroxide is 150 parts by weight is that if it exceeds 150 parts by weight with respect to 100 parts by weight of polyethylene, the tensile strength cannot be satisfied.

  The identification stripe of the electric wire having the identification stripe-containing structure becomes a part having weather resistance by blending the ultraviolet absorber, and has flame retardancy by blending the metal hydroxide. The reason why the upper limit of the amount of the metal hydroxide is 300 parts by weight is that, in the case of an identification stripe, if the amount exceeds 300 parts by weight with respect to 100 parts by weight of polyethylene, the tensile strength cannot be satisfied. This is because the lower limit of 10 parts by weight considers the flame retardancy in the case of an identification stripe. The reason why the stripe width of the identification stripe is set to 1/10 to 1/4 with respect to the entire circumference of the insulator body is that consideration is given to reducing the colored portion. In other words, this is because the black portion particularly good in weather resistance is enlarged.

  In addition, regarding the insulator of the electric wire of black 1 layer structure, it is the same as this invention of Claim 4.

  The polyethylene insulated wire for lead-in of the present invention according to claim 7 is the polyethylene insulated wire for lead-in according to any one of claims 1 to 6, wherein the ultraviolet absorber is 1 to 10 weights with respect to 100 parts by weight of polyethylene. It is characterized by the combination of parts.

  According to the present invention having such characteristics, when the blending amount of the ultraviolet absorber is less than 1 part by weight with respect to 100 parts by weight of polyethylene, sufficient weather resistance cannot be obtained, and when it exceeds 10 parts by weight, the weather resistance is exceeded. This is because the insulation resistance cannot be satisfied although it is improved.

  According to each of the present inventions described in claims 1 to 3, there is an effect that it is possible to provide a twisted-type lead-in polyethylene insulated wire having high weather resistance and flame retardancy. .

  According to each of the present inventions described in claims 4 to 6, there is an effect that an electric wire or a part having flame retardancy and sufficient tensile strength can be obtained.

  According to the sixth aspect of the present invention, there is an effect that it has flame retardancy, has a sufficient tensile strength, and can reduce colored portions other than black.

  According to the present invention described in claim 7, there is an effect that sufficient weather resistance can be ensured while suppressing a decrease in insulation resistance.

  Hereinafter, description will be given with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a lead-in polyethylene insulated wire according to the present invention.

  In FIG. 1, a polyethylene insulated wire (DE wire) for lead-in of the present invention is a low-voltage lead-in wire 11 having weather resistance and flame retardancy, and the total number is not particularly limited. It is manufactured by twisting together a wire 12 having a layer structure and two wires 13 and 14 having a single layer structure of identification color (one wire 12 having a black single layer structure and, for example, one layer of identification color 1 layer) Two wires may be configured by twisting the electric wire 13 having a structure).

  The low-voltage lead-in wire 11 is a twisted-type lead-in polyethylene insulated wire.

  An electric wire 12 having a black one-layer structure in the low-voltage lead-in electric wire 11 includes a conductor 15 and an insulator 16 that covers the outer periphery of the conductor 15. The electric wire 13 having an identification color one-layer structure includes a conductor 17 and an insulator 18 that covers the outer periphery of the conductor 17. In addition, the electric wire 14 having the identification color one-layer structure includes a conductor 17 and an insulator 19 that covers the outer periphery of the conductor 17.

  All of the black one-layer structure electric wire 12 and the identification color one-layer electric wires 13 and 14 have the same predetermined diameter (assumed to be an example). The conductors 15 and 17 are made of copper or hard aluminum.

  The insulator 16 of the electric wire 12 having a black one-layer structure is formed of polyethylene that is mixed with a metal hydroxide and colored black. On the other hand, the insulators 18 and 19 of the electric wires 13 and 14 having the identification color one-layer structure are formed by blending a metal hydroxide and an ultraviolet absorber with polyethylene and coloring them other than black. The insulators 18 and 19 are the same except for the different colors. The insulators 18 and 19 can be identified.

  The amount of metal hydroxide added to polyethylene is set in consideration of the self-digestion action and the mechanical properties (such as tensile strength) of the insulator. In this embodiment, 0 to 150 parts by weight of metal hydroxide is blended with 100 parts by weight of polyethylene (the metal hydroxide is blended when flame retardancy is imparted). Will be described later with reference to the table). The metal hydroxide is one of magnesium hydroxide, aluminum hydroxide, zirconium hydroxide, calcium hydroxide, and barium hydroxide, or a mixture of two or more.

  Regarding the coloring of polyethylene to black, in this embodiment, carbon black is added (assumed as an example. Carbon black is very strong in terms of weather resistance). By adding carbon black, UV deterioration can be avoided from the viewpoint of weather resistance. As for the blending of the ultraviolet absorbers related to the wires 13 and 14 having the identification color one-layer structure, the blending amount with respect to polyethylene is set in consideration of weather resistance and insulation resistance. In this embodiment, 1 to 10 parts by weight is blended with respect to 100 parts by weight of polyethylene (the blending will be described later with reference to the table). Examples of ultraviolet absorbers include benzophenones, salicylic acid esters, and bend triazoles.

  In the above-described configuration, the low-voltage lead-in electric wire 11 includes a black one-layer structure electric wire 12 and an identification color one-layer structure electric wires 13 and 14 constituting the electric wire having weather resistance. The wires 13 and 14 having the identification color one-layer structure have weather resistance by blending an ultraviolet absorber even if the insulators 18 and 19 are colored other than black.

  Therefore, the low-voltage lead-in wire 11 has an effect of having high weather resistance. That is, there is an effect that it is possible to prevent the insulator from becoming brittle or thin due to ultraviolet deterioration. In addition, the low-voltage lead-in electric wire 11 has an effect that it is possible to avoid insulation breakdown due to a short circuit between phases even when the electric wire 12 having a black one-layer structure and the electric wires 13 and 14 having an identification color one-layer structure are twisted together.

  Further, the low-voltage lead-in wire 11 is not limited even if, for example, tracking occurs at this terminal and a flame tries to burn and spread on the surface of the insulator 16 or a flame tries to burn and spread on the surfaces of the insulators 18 and 19. The crystal water contained in the metal hydroxide blended in the polyethylene of the insulators 16, 18, and 19 is ejected and self-digestion is performed. Therefore, the low-voltage lead-in wire 11 has an effect that it is difficult to burn, in other words, has flame retardancy. Furthermore, the low-voltage lead-in wire 11 has an effect that it is an environment-friendly wire that does not generate harmful gas such as hydrogen chloride.

  Next, another embodiment of the lead-in polyethylene insulated wire of the present invention will be described with reference to FIG. FIG. 2 is a cross-sectional view showing another embodiment. It should be noted that the same reference numerals are given to basically the same components as those described in FIG. 1, and detailed description thereof will be omitted.

  In FIG. 2, a polyethylene insulated wire (DE wire) for lead-in of the present invention is a low-voltage lead-in wire 21 having weather resistance and flame retardancy, and the total number is not particularly limited. It is manufactured by twisting together a wire 12 having a layer structure and two wires 22 and 23 having a two-color identification color (one black single-layer wire 12 and, for example, one identification color two-layer Two wires may be configured by twisting the electric wire 22 having a structure).

  The low-voltage lead-in wire 21 is a twisted-type lead-in polyethylene insulated wire.

  The electric wire 22 having the identification color two-layer structure in the low-voltage lead-in electric wire 21 includes a conductor 24 and an insulator 25 that covers the outer periphery of the conductor 24. Further, the electric wire 23 having the identification color two-layer structure includes a conductor 24 and an insulator 26 that covers the outer periphery of the conductor 24. The insulator 25 is composed of an inner layer 27 and an outer layer 28. The insulator 26 is also composed of an inner layer 27 and an outer layer 29.

  The three electric wires 12 and 23 having the black one-layer structure and the two-identity color two-layer structure have the same predetermined diameter (assumed to be an example). The conductors 15 and 24 are made of copper or hard aluminum.

  The inner layer 27 in the insulators 25 and 26 of the wires 22 and 23 having the identification color two-layer structure is formed in the same manner as the insulator 16 of the wire 12 having the black one-layer structure. That is, it is formed of polyethylene that is mixed with a metal hydroxide and colored black. On the other hand, the outer layers 28 and 29 in the insulators 25 and 26 of the wires 22 and 23 having the identification color two-layer structure are formed by blending a metal hydroxide and an ultraviolet absorber with polyethylene and being colored other than black. Has been. The insulators 25 and 26 are the same except that the outer layers 28 and 29 are colored differently. The insulators 25 and 26 can be identified.

  The amount of metal hydroxide added to polyethylene is set in consideration of the self-digestion action and the mechanical properties (such as tensile strength) of the insulator. In this embodiment, the inner layer 27 in the insulators 25 and 26 of the black electric wire 12 having a single layer structure and the electric wires 22 and 23 having an identification color two layer structure has 0 to 150 parts by weight of metal hydroxide with respect to 100 parts by weight of polyethylene. It mix | blends (it mentions later, referring a table | surface about a mixing | blending). On the other hand, the outer layers 28 and 29 in the insulators 25 and 26 of the wires 22 and 23 having the identification color two-layer structure are mixed with 10 to 300 parts by weight of metal hydroxide with respect to 100 parts by weight of polyethylene. (The formulation will be described later with reference to the table). The metal hydroxide is one of magnesium hydroxide, aluminum hydroxide, zirconium hydroxide, calcium hydroxide, and barium hydroxide, or a mixture of two or more. The metal hydroxide is blended for imparting flame retardancy.

  With respect to coloring polyethylene black, in this embodiment, carbon black is added (assumed as an example. Carbon black is very strong in terms of weather resistance). By adding carbon black, UV deterioration can be avoided from the viewpoint of weather resistance. As for the blending of the ultraviolet absorbers related to the electric wires 22 and 23 having the identification color two-layer structure, the blending amount with respect to polyethylene is set in consideration of weather resistance and insulation resistance. In this embodiment, 1 to 10 parts by weight is blended with respect to 100 parts by weight of polyethylene (the blending will be described later with reference to the table). Examples of ultraviolet absorbers include benzophenones, salicylic acid esters, and bend triazoles.

  In the above-described configuration, the low-voltage lead-in electric wire 21 is such that the black one-layer structure electric wire 12 and the identification color two-layer structure electric wires 22 and 23 constituting the electric wire have weather resistance. The wires 22 and 23 having the identification color two-layer structure have the same weather resistance as the inner layer 27 by adding an ultraviolet absorber even if the outer layers 28 and 29 of the insulators 25 and 26 are colored other than black. ing.

  Therefore, the low-voltage lead-in wire 21 has an effect of having high weather resistance. That is, there is an effect that it is possible to prevent the insulator from becoming brittle or thin due to ultraviolet deterioration. Further, the low-voltage lead-in electric wire 21 has an effect that it is possible to avoid an insulator breakdown due to a short circuit between phases even when the electric wire 12 having a black one-layer structure and the electric wires 22 and 23 having an identification color two-layer structure are twisted together.

  Further, the low-voltage lead-in wire 21 may be caused by, for example, tracking occurring at this terminal and a flame burning on the surface of the insulator 16, or a flame burning the surfaces of the outer layers 28 and 29 in the insulators 25 and 26. Even if it is intended to spread, crystal water contained in the metal hydroxide blended in the polyethylene of the insulators 16, 25, and 26 is ejected and self-digestion is performed. Therefore, the low-voltage lead-in wire 21 has an effect that it is difficult to burn, in other words, has flame retardancy. Furthermore, the low-voltage lead-in wire 21 has an effect that it is an environment-friendly wire that does not generate harmful gas such as hydrogen chloride.

  Next, still another embodiment of the lead-in insulated polyethylene insulated wire of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view showing still another embodiment. It should be noted that the same components as those described in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 3, the lead-in polyethylene insulated electric wire (DE electric wire) of the present invention is a low-voltage lead-in electric wire 31 having weather resistance and flame retardancy, and the total number is not particularly limited. It is manufactured by twisting together the electric wire 12 having a layer structure and the electric wires 32 and 33 having two discriminating stripe-containing structures (one electric wire 12 having a one-layer black structure and one discriminating stripe-containing electric wire, for example) Two wires may be configured by twisting the electric wires 32).

  The low-voltage lead-in wire 31 is a twisted-type lead-in polyethylene insulated wire.

  An electric wire 32 having an identification stripe-containing structure in the low-voltage lead-in electric wire 31 includes a conductor 34 and an insulator 35 that covers the outer periphery of the conductor 34. The identification stripe-containing electric wire 33 includes a conductor 34 and an insulator 36 covering the outer periphery of the conductor 34. The insulator 35 includes an insulator body 37 and one or a plurality of identification stripes 38. The insulator 36 is also composed of an insulator body 37 and one or a plurality of identification stripes 39.

  The black one-layer structure electric wire 12 and the identification stripe-containing structure electric wires 32 and 33 all have the same predetermined diameter (assumed to be an example). The conductors 15 and 34 are made of copper or hard aluminum.

  The insulator body 37 in the insulators 35 and 36 of the electric wires 32 and 33 having the identification stripe-containing structure is formed in the same manner as the insulator 16 of the electric wire 12 having the black one-layer structure. That is, it is formed of polyethylene that is mixed with a metal hydroxide and colored black. On the other hand, the identification stripes 38 and 39 in the insulators 35 and 36 of the electric wires 32 and 33 having the identification stripe-containing structure are obtained by blending a metal hydroxide and an ultraviolet absorber into polyethylene and being colored other than black. Molded.

  The identification stripes 38 and 39 are formed so as to be integrated with the outer surface of the insulator body 37. The identification stripes 38 and 39 are formed so that the stripe width is about 1/10 to 1/4 with respect to the entire circumference of the insulator body 37.

  The insulators 35 and 36 are the same except that the color of the identification stripes 38 and 39 is different. The insulators 35 and 36 can be identified.

  The amount of metal hydroxide added to polyethylene is set in consideration of the self-digestion action and the mechanical properties (such as tensile strength) of the insulator. In this embodiment, the insulator main body 37 in the insulators 35 and 36 of the electric wire 12 having a black one-layer structure and the electric wires 32 and 33 having an identification stripe-containing structure is 0 to 150 parts by weight of metal hydroxide with respect to 100 parts by weight of polyethylene. (The composition will be described later with reference to the table). On the other hand, the identification stripes 38 and 39 in the insulators 35 and 36 of the wires 32 and 33 having the identification stripe-containing structure are mixed with 10 to 300 parts by weight of metal hydroxide with respect to 100 parts by weight of polyethylene. (The formulation will be described later with reference to the table). The metal hydroxide is one of magnesium hydroxide, aluminum hydroxide, zirconium hydroxide, calcium hydroxide, and barium hydroxide, or a mixture of two or more. The metal hydroxide is blended for imparting flame retardancy.

  Regarding the coloring of polyethylene to black, in this embodiment, carbon black is added (assumed as an example. Carbon black is very strong in terms of weather resistance). By adding carbon black, UV deterioration can be avoided from the viewpoint of weather resistance. As for the blending of the ultraviolet absorbers related to the electric wires 32 and 33 having the identification stripe-containing structure, the blending amount with respect to polyethylene is set in consideration of weather resistance and insulation resistance. In this embodiment, 1 to 10 parts by weight is blended with respect to 100 parts by weight of polyethylene (the blending will be described later with reference to the table). Examples of ultraviolet absorbers include benzophenones, salicylic acid esters, and bend triazoles.

  In the above configuration, the low-voltage lead-in electric wire 31 is a weather-resistant electric wire in which the electric wire 12 having a black one-layer structure and the electric wires 32 and 33 having an identification stripe structure are included. The wires 32 and 33 having an identification stripe-containing structure have weather resistance similar to that of the insulator body 37 by blending an ultraviolet absorber even if the identification stripes 38 and 39 in the insulators 35 and 36 are colored other than black. It is like that.

  Therefore, the low voltage lead-in wire 31 has an effect of having high weather resistance. That is, there is an effect that it is possible to prevent the insulator from becoming brittle or thin due to ultraviolet deterioration. In addition, the low-voltage lead-in electric wire 31 has an effect that it is possible to avoid insulation breakdown due to a short circuit between phases even when the electric wire 12 having a black one-layer structure and the electric wires 32 and 33 having an identification stripe-containing structure are twisted together. Further, since the low-voltage lead-in wire 31 has the identification stripes 38 and 39, there is an effect that the weather-resistant black portion can be increased and the colored portion can be reduced.

  Furthermore, the low-voltage lead-in wire 31 can be used, for example, when tracking is generated at this terminal and a flame burns and spreads on the surface of the insulator 16, or a flame is generated on the surface of the insulator body 37 in the insulators 35 and 36. Even if the surfaces of the identification stripes 38 and 39 are burned and spread, crystal water contained in the metal hydroxide blended in the polyethylene of the insulators 16, 35 and 36 is ejected and self-digestion is performed. ing. Therefore, the low-voltage lead-in wire 31 has an effect that it is difficult to burn, in other words, has flame retardancy. Furthermore, the low-voltage lead-in wire 31 has an effect that it is an environment-friendly wire that does not generate harmful gas such as hydrogen chloride.

  Then, supplementary explanation is given about the above-mentioned composition, referring to Tables 1-3. Table 1 shows the composition, characteristics, and determination of metal hydroxides related to an insulator in a black one-layer structure electric wire, an inner layer in an identification color two-layer electric wire insulator, and an insulator body in an identification stripe-containing electric wire It is a table | surface which shows. Table 2 is a table showing the composition, characteristics, and determination of the metal hydroxide related to the outer layer in the electric wire insulator having the identification color two-layer structure. Table 3 is a table showing the composition, characteristics, and determination of the ultraviolet absorber related to the outer layer in the electric wire insulator having the identification color two-layer structure.

  In Table 1, Example 1 is composed of 0 parts by weight of magnesium hydroxide (Mg (OH) 2) with respect to 100 parts by weight of polyethylene (PE), that is, a composition containing no metal hydroxide. 18, 19, inner layer 27, and insulator body 37 are molded.

  Example 2 is a composition in which 50 parts by weight of magnesium hydroxide (Mg (OH) 2) is blended with 100 parts by weight of polyethylene (PE), and the insulators 16, 18, 19, the inner layer 27, and the insulator body 37 is formed.

  Example 3 is a composition in which 150 parts by weight of magnesium hydroxide (Mg (OH) 2) is blended with 100 parts by weight of polyethylene (PE), and the insulators 16, 18, 19 and the inner layer 27 and the insulator body 37 is formed.

  On the other hand, Comparative Example 1 is a composition in which 155 parts by weight of magnesium hydroxide (Mg (OH) 2) is blended with 100 parts by weight of polyethylene (PE), and the insulators 16, 18, 19 and the inner layer 27 and the insulation. The body main body 37 is formed.

  Properties are measured with tensile strength (unit: MPa) and tensile elongation (unit:%), and judgment is made when the tensile strength standard is 10 MPa or more and the tensile elongation standard is 350% or more, and these are satisfied. If it is not satisfied, “x” is determined.

  In Example 1, the tensile strength is 17.6 MPa, the tensile elongation is 636%, and it is determined as “◯” that the standard is satisfied. In Example 2, the tensile strength is 15.2 MPa, the tensile elongation is 553%, and it is determined as “◯” that the standard is satisfied. In Example 3, the tensile strength was 17.6 MPa, the tensile elongation was 636%, and it was judged as “◯” as satisfying the standard.

  On the other hand, Comparative Example 1 has a tensile strength of 9.7 MPa and a tensile elongation of 421%, and thus cannot satisfy the standard and is judged as “x”.

  From Table 1, it can be seen that as the compounding amount of the metal hydroxide increases, the tensile strength decreases. Therefore, the insulators 16, 18, 19 in the electric wire 12 having the black one-layer structure, the inner layer 27 in the insulators 25, 26 in the electric wires 22, 23 having the identification color two-layer structure, and the electric wires 32, 33 having the identification stripe-containing structure The compounding amount of the metal hydroxide related to the body body 37 is preferably 0 to 150 parts by weight with respect to 100 parts by weight of polyethylene.

  In Table 2, Example 4 forms the outer layers 28 and 29 in the insulators 25 and 26 with a composition in which 10 parts by weight of magnesium hydroxide (Mg (OH) 2) is blended with 100 parts by weight of polyethylene (PE). It is a thing.

  In Example 5, the outer layers 28 and 29 of the insulators 25 and 26 were molded with a composition in which 50 parts by weight of magnesium hydroxide (Mg (OH) 2) was blended with 100 parts by weight of polyethylene (PE). It is.

  In Example 6, the outer layers 28 and 29 in the insulators 25 and 26 were molded with a composition in which 155 parts by weight of magnesium hydroxide (Mg (OH) 2) was blended with 100 parts by weight of polyethylene (PE). It is.

  In Example 7, the outer layers 28 and 29 in the insulators 25 and 26 were molded with a composition in which 200 parts by weight of magnesium hydroxide (Mg (OH) 2) was blended with 100 parts by weight of polyethylene (PE). It is.

  In Example 8, the outer layers 28 and 29 in the insulators 25 and 26 were molded with a composition in which 300 parts by weight of magnesium hydroxide (Mg (OH) 2) was blended with 100 parts by weight of polyethylene (PE). It is.

  On the other hand, in Comparative Example 2, the outer layers 28 and 29 in the insulators 25 and 26 are molded with a composition in which 310 parts by weight of magnesium hydroxide (Mg (OH) 2) is blended with 100 parts by weight of polyethylene (PE). It is a thing.

  Comparative Example 3 was formed by molding outer layers 28 and 29 in insulators 25 and 26 with a composition in which 5 parts by weight of magnesium hydroxide (Mg (OH) 2) was blended with 100 parts by weight of polyethylene (PE). It is.

  The properties are tensile strength (unit: MPa), tensile elongation (unit:%), and tracking resistance measurement. The determination is that the tensile strength standard is 6 MPa or more (usually polyethylene is 10 MPa or more, but the outer layer In this case, it is sufficient to have 6 MPa or more), and the tensile elongation standard is 350% or more and the tracking resistance standard is 450 times or more. In this case, “x” is determined.

  In Example 4, the tensile strength was 16.8 MPa, the tensile elongation was 608%, the tracking resistance was 500 times, and “◯” was determined as satisfying the standard. In Example 5, the tensile strength was 15.2 MPa, the tensile elongation was 553%, the tracking resistance was 3,500 times, and “◯” was determined as satisfying the standard. In Example 6, the tensile strength was 9.7 MPa, the tensile elongation was 421%, the tracking resistance was 4200 times, and “◯” was determined as satisfying the standard. In Example 7, the tensile strength was 8.1 MPa, the tensile elongation was 387%, the tracking resistance was 4800 times, and “◯” was determined as satisfying the standard. In Example 8, the tensile strength was 6.1 MPa, the tensile elongation was 352%, the tracking resistance was 5000 times, and “◯” was determined as satisfying the standard.

  On the other hand, Comparative Example 2 has a tensile strength of 5.8 MPa, a tensile elongation of 342%, and a tracking resistance of 5000 times, and cannot satisfy the standard, and is judged as “x”. In Comparative Example 3, the tensile strength was 17.2 MPa, the tensile elongation was 616%, and the tracking resistance was 140 times, and the standard could not be satisfied.

  From Table 2, it can be seen that when the compounding amount of the metal hydroxide is increased, the tensile strength and the tensile elongation of the outer layers 28 and 29 are lowered. In addition, in the case of the outer layers 28 and 29, it can be seen that the tracking resistance deteriorates when the blending amount of the metal hydroxide decreases. Therefore, the blending amount of the metal hydroxides related to the outer layers 28 and 29 in the insulators 25 and 26 of the wires 22 and 23 having the identification color two-layer structure is preferably 10 to 300 parts by weight with respect to 100 parts by weight of polyethylene. (The identification stripes 38 and 39 in the electric wires 32 and 33 having an identification stripe-containing structure are also preferably mixed in an amount of 10 to 300 parts by weight with respect to 100 parts by weight of polyethylene. Similarly, the lower limit of the compounding amount of the metal hydroxide for the insulators 16, 18, 19 of the low-voltage lead-in wire 11 and the inner layer 27 in the insulators 25, 26 of the low-voltage lead-in wire 21 is 100 parts by weight of polyethylene. 10 parts by weight is preferred).

  In Table 3, Example 9 relates to the outer layers 28 and 29 in the insulators 25 and 26 of the electric wires 22 and 23 having the identification color two-layer structure, and 1 part by weight of the ultraviolet absorber with respect to 100 parts by weight of polyethylene (PE). It is a blend.

  Further, Example 10 relates to the outer layers 28 and 29 in the insulators 25 and 26 of the wires 22 and 23 having the identification color two-layer structure, and 5 parts by weight of an ultraviolet absorber is blended with 100 parts by weight of polyethylene (PE). Is.

  Further, Example 11 relates to the outer layers 28 and 29 in the insulators 25 and 26 of the electric wires 22 and 23 having the identification color two-layer structure, and 10 parts by weight of an ultraviolet absorber is blended with 100 parts by weight of polyethylene (PE). Is.

  On the other hand, Comparative Example 4 relates to the outer layers 28 and 29 in the insulators 25 and 26 of the electric wires 22 and 23 having the identification color two-layer structure, and 0 part by weight of the ultraviolet absorber with respect to 100 parts by weight of polyethylene (PE) Formulation, that is, a compound that does not contain an ultraviolet absorber.

  Further, Comparative Example 5 relates to the outer layers 28 and 29 in the insulators 25 and 26 of the wires 22 and 23 having the identification color two-layer structure, and 15 parts by weight of an ultraviolet absorber is blended with 100 parts by weight of polyethylene (PE). Is.

  The characteristic is determined as “◯” when the weather resistance is good, and as “x” when the weather resistance is not good. In addition, “◯” is determined when the insulation resistance is good, and “X” is determined when the insulation resistance is not good.

  In Examples 9 to 11, weather resistance and insulation resistance are good, and both are judged as “◯”. On the other hand, in Comparative Example 4, the weather resistance is not good, and the determination is “x”. In Comparative Example 5, the insulation resistance is not good, and the determination is “x”.

  From Table 3, it can be seen that the weather resistance becomes better as the blending amount of the ultraviolet absorber increases, but the insulation resistance decreases. Therefore, the blending amount of the ultraviolet absorbers related to the outer layers 28 and 29 in the insulators 25 and 26 of the wires 22 and 23 having the identification color two-layer structure is preferably 1 to 10 parts by weight with respect to 100 parts by weight of polyethylene. (In addition, 1 to 10 parts by weight of the insulators 18 and 19 in the wires 13 and 14 having the identification color one-layer structure and the identification stripes 38 and 39 in the wires 32 and 33 having the identification stripe-containing structure are also preferable. Suppose it is).

  It goes without saying that the present invention can be variously modified without departing from the spirit of the present invention.

It is sectional drawing which shows one Embodiment of the polyethylene insulated wire for drawing-in of this invention. It is sectional drawing which shows other one Embodiment of the polyethylene insulated wire for drawing-in of this invention. It is sectional drawing which shows other one Embodiment of the polyethylene insulated wire for drawing-in of this invention. It is an end view of the low voltage | pressure lead-in electric wire of a prior art example.

Explanation of symbols

11 Low voltage lead-in wire (polyethylene insulated wire for lead-in)
12 Black 1-layer structure wire 13, 14 Identification color 1-layer structure wire 15, 17 Conductor 16, 18, 19 Insulator 21 Low-voltage lead-in wire (polyethylene lead-in wire for lead-in)
22, 23 Identification color 2-layer structure 24 Conductor 25, 26 Insulator 27 Inner layer 28, 29 Outer layer 31 Low voltage lead-in wire (polyethylene lead-in wire for lead-in)
32, 33 Electric wire with identification stripe structure 34 Conductor 35, 36 Insulator 37 Insulator body 38, 39 Identification stripe

Claims (7)

A black one-layer electric wire formed by coating a black-colored polyethylene insulator on a conductor, and a conductor that is coated with a non-black colored insulator coated with an ultraviolet absorber in polyethylene It is made by twisting together the wire of color 1 layer structure.
Alternatively, the lead-in polyethylene insulated wire, wherein the black one-layer structure electric wire and the plurality of identification color one-layer electric wires having different colors are twisted together. A black one-layer electric wire formed by coating a black-colored polyethylene insulator on a conductor, a black-colored polyethylene inner layer, and a polyethylene blended with an ultraviolet absorber and colored other than black Twisting an electric wire having an identification color two-layer structure in which an insulator composed of an outer layer is coated on a conductor,
Alternatively, the polyethylene insulated electric wire for lead-in, which is formed by twisting the electric wire having the black one-layer structure and the plurality of electric wires having the two-layer structure of identification colors that are differently colored. A black one-layer electric wire formed by coating a black colored polyethylene insulator on a conductor, a black colored polyethylene insulator body, and a polyethylene blended with an ultraviolet absorber and colored other than black A wire having an identification stripe-containing structure formed by covering a conductor with an insulator composed of an identification stripe integrated with the outer surface of the insulator body; and
Alternatively, the polyethylene insulated electric wire for lead-in, which is formed by twisting the electric wire having the black one-layer structure and the electric wires having a plurality of the identification stripe-containing structures having different colors. The retractable polyethylene insulated wire according to claim 1,
The black one-layer electric wire insulator is formed by blending 0 to 150 parts by weight of metal hydroxide with respect to 100 parts by weight of polyethylene.
The wire insulation of the identification color 1 layer structure is formed by blending 0 to 150 parts by weight of metal hydroxide with respect to 100 parts by weight of polyethylene. The lead-in polyethylene insulated wire according to claim 2,
The black one-layer electric wire insulator is formed by blending 0 to 150 parts by weight of metal hydroxide with respect to 100 parts by weight of polyethylene.
The inner layer in the insulator of the identification color two-layer structure is formed by blending 0 to 150 parts by weight of a metal hydroxide with respect to 100 parts by weight of polyethylene.
The outer layer in the insulator of the electric wire having the identification color two-layer structure is formed by blending 10 to 300 parts by weight of metal hydroxide with respect to 100 parts by weight of polyethylene. In the lead-in polyethylene insulated wire according to claim 3,
The black one-layer electric wire insulator is formed by blending 0 to 150 parts by weight of metal hydroxide with respect to 100 parts by weight of polyethylene.
The insulator main body of the electric wire having the identification stripe-containing structure is formed by blending 0 to 150 parts by weight of metal hydroxide with respect to 100 parts by weight of polyethylene,
The identification stripe of the electric wire having the identification stripe-containing structure is formed by blending 10 to 300 parts by weight of a metal hydroxide with respect to 100 parts by weight of polyethylene, and has a stripe width of 1/1 with respect to the entire circumference of the insulator body. A polyethylene insulated wire for lead-in, which is formed to 10 to 1/4. In the polyethylene insulated wire for lead-in according to any one of claims 1 to 6,
The said ultraviolet absorber is a mixing | blending of 1-10 weight part with respect to 100 weight part of polyethylene. The polyethylene insulated wire for drawing in characterized by the above-mentioned.

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