JP2019079741A - cable - Google Patents

Abstract

To provide a cable which can suppress migration to an insulator even when a large amount of a plasticizer is blended in a sheath, is excellent in flexibility, and is also excellent in physical properties such as tensile elongation and tensile strength.SOLUTION: A cable has an insulator (3), a separator (4) and a sheath (5) formed of a soft vinyl chloride resin composition in this order on the outer periphery of a conductor (2), in which the separator is formed of a resin film, is spirally wound around the outer periphery of the insulator or is wound longitudinally in the longitudinal direction, and the resin film has a density of 0.900 g/cmor more and a thickness of 0.025 mm or more.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a cable, and more particularly to a cable in which an insulated wire including a conductor and an insulator covering the conductor is covered with a protective coating (sheath).

  Insulated wires in which a stranded conductor is covered with an insulator, and cables in which the insulated wire is covered with a protective sheath (sheath) are, for example, low voltage and high voltage trunks, switchboards, railway cars, automobiles, electric and electronic devices, etc. Used.

  Heretofore, vinyl chloride resin compositions have often been used as insulators and sheath materials from the viewpoints of flame retardancy, heat resistance, economy and the like.

  The cable is required to have a high degree of flexibility from the viewpoint of handling. As a method of making the cable flexible, for example, a method such as blending a large amount of plasticizer with the vinyl chloride resin composition constituting the sheath material; reducing the density of the insulator to reduce the weight; . However, when a large amount of plasticizer is added to the vinyl chloride resin composition, the plasticizer of the sheath is easily transferred to the insulator, and there is a problem that the tensile elongation, tensile strength and the like of the cable are deteriorated. Further, if it is attempted to reduce the density of the insulator to reduce the weight, the problem of migration of the plasticizer will increase. As described above, a large amount of plasticizer mixed in the sheath and weight reduction of the insulator are recognized as contradictory matters in the prior art, and the simultaneous implementation of both is extremely difficult, and an improvement has been required.

  In order to solve the problem of the migration of the plasticizer, for example, Patent Document 1 includes an insulator, an outer conductor made of braided or transversely wound metal wire, and a sheath made of soft vinyl chloride resin on the outer periphery of the inner conductor. A coaxial cable provided with a plasticizer migration preventing layer made of a polyester thermoplastic elastomer for preventing migration of a plasticizer contained in the sheath, between the insulator and the sheath. ing.

JP, 2012-119231, A

  However, the elastomeric material used in Patent Document 1 is not easy to extrude and is not versatile because it is generally expensive.

  The present invention has been made in view of the above-described circumstances, and the object thereof is that even if a large amount of plasticizer is blended in the sheath, the transition to the insulator can be suppressed, and while the flexibility is excellent, the tensile elongation and tensile strength are achieved. It is an object of the present invention to provide a cable excellent in physical properties such as

In order to achieve the objective mentioned above, the cable concerning the present invention is characterized by following (1)-(4).
(1)
An insulator, a separator, and a sheath made of a soft vinyl chloride resin composition are provided in this order on the outer periphery of the conductor,
The separator is made of a resin film and is helically wound around the outer periphery of the insulator or longitudinally attached to the insulator.
The resin film is a cable having a density of 0.900 g / cm ³ or more and a thickness of 0.025 mm or more.
(2)
In the cable described in (1) above,
It is a cable characterized in that the resin film is made of at least one resin selected from the group consisting of polyethylene resin, polypropylene resin and polyester resin.
(3)
In the cable according to the above (1) or (2),
The soft vinyl chloride resin composition is at least one plastic selected from the group consisting of phthalic acid ester plasticizers, phosphoric acid ester plasticizers, adipic acid ester plasticizers and trimellitic acid ester plasticizers. Being a cable characterized by containing an agent.
(4)
In the cable according to any one of the above (1) to (3),
The resin film is a cable characterized by containing at least one of calcium carbonate and talc.

  According to the cable of the above configuration (1), the separator is provided between the sheath and the insulator, and the material, density and thickness of the separator are set in a specific range. According to this configuration, even if a large amount of plasticizer is compounded in the soft vinyl chloride resin composition constituting the sheath and / or the density of the insulator is lowered to reduce the weight, the sheath to the insulator Migration of plasticizers is suppressed. Therefore, according to the present invention, it is possible to provide a cable which is excellent in flexibility and is also excellent in physical properties such as tensile elongation and tensile strength.

  According to the cable of the structure of said (2), the said resin-made film shall be comprised by at least 1 sort (s) of resin selected from the group which consists of polyethylene-type resin, a polypropylene resin, and polyester-type resin. Therefore, the cable of the above configuration (2) can further suppress the transfer of the plasticizer from the sheath to the insulator.

  According to the cable of the above configuration (3), the soft vinyl chloride resin composition comprises a phthalate ester plasticizer, a phosphate ester plasticizer, an adipate plasticizer, and a trimellitate ester plasticizer. And at least one plasticizer. Therefore, the cable of the above configuration (3) is excellent in flexibility.

  According to the cable of the configuration of the above (4), the resin film contains at least one of calcium carbonate and talc. Therefore, in the cable of the above configuration (4), desired physical properties can be easily adjusted.

  According to the present invention, even when a large amount of plasticizer is compounded in the sheath, the transition to the insulator can be suppressed, and a cable excellent in flexibility and excellent in physical properties such as tensile elongation and tensile strength can be provided.

  The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading the modes for carrying out the invention described below (hereinafter referred to as "embodiments") with reference to the attached drawings. .

1 is a cross-sectional view of one embodiment of a cable according to the present invention.

  Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of one embodiment of a cable according to the present invention.
As shown in FIG. 1, a cable 1 according to an embodiment of the present invention includes a conductor 2 such as a copper wire, an insulator 3 covering the outer periphery of the conductor 2, and a separator 4 covering the outer periphery of the insulator 3. A sheath 5 covering the outer periphery of the separator 4 is provided in this order.

<Conductor>
The conductor 2 may be only one strand or may be formed by bundling a plurality of strands. Also, it may be a single mind or a multi-mind having multiple hearts. As a material of the conductor 2, for example, conductive metals such as copper, plated copper, copper alloy, aluminum, aluminum alloy and the like can be used.

<Insulator>
The insulator 3 can be made of a conventionally known material. For example, polyolefin resin is mentioned. As a polyolefin resin, polyethylene (PE), polypropylene (PP), ethylene-ethyl acrylate copolymer (EEA), ethylene-vinyl acetate copolymer (EVA), ethylene-methyl acrylate copolymer (EMA), ethylene -A propylene copolymer etc. are mentioned. These polyolefin resins may be used alone or in combination of two or more. Among them, polyethylene (PE), polypropylene (PP), ethylene-ethyl acrylate copolymer (EEA), and ethylene-vinyl acetate copolymer (EVA) are preferably used from the viewpoint of mechanical properties and electrical properties.

<Separator>
The separator 4 is made of a resin film. The material to be the main component of the resinous film is not particularly limited, but preferably contains at least one resin selected from the group consisting of polyethylene resins, polypropylene resins and polyester resins.
Examples of polyethylene resins include homopolymers of ethylene such as high density polyethylene and low density polyethylene, ethylene-propylene copolymers, ethylene-1-butene copolymers, ethylene-1-hexene copolymers, ethylene- Ethylenes such as 1-heptene copolymer, ethylene-1-octene copolymer, ethylene-4-methyl-1-pentene copolymer, ethylene-1-nonene copolymer, ethylene-1-decene copolymer, etc. α-olefin copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer, ethylene-acrylic acid ester copolymer, ethylene-methacrylic acid copolymer, ethylene-methacrylic acid ester copolymer or the like Copolymers of ethylene such as resins modified with maleic anhydride etc. can be mentioned.
Examples of polypropylene resins include homopolypropylene, random polypropylene and block polypropylene.
Examples of polyester resins include polyethylene terephthalate (PET), polybutylene terephthalate, polylactic acid, polycaprolactone and the like.

In the present embodiment, the separator 4 has a density of 0.900 g / cm ³ or more and a thickness of 0.025 mm or more. By interposing a separator made of a resin film having a density of 0.900 g / cm ³ or more and a thickness of 0.025 mm or more between the insulator and the sheath, the transition of the plasticizer to be impregnated into the sheath to the insulator is It is possible to make a cable that does not impair the cable characteristics while preventing it.
When the density is less than 0.900 g / cm ³ , the plasticizer contained in the sheath 5 is easily transferred to the insulator 3 and physical properties such as tensile strength and tensile elongation of the cable 1 are deteriorated. On the other hand, even when the thickness is less than 0.025 mm, the plasticizer contained in the sheath 5 is easily transferred to the insulator 3, and physical properties such as tensile strength and tensile elongation of the cable 1 are deteriorated.
The density of the separator 4 is preferably 0.900~1.500g / cm ^3, more preferably 0.900~1.200g / cm ^3. The thickness of the separator 4 is preferably 0.025 to 0.100 mm, and more preferably 0.025 to 0.050 mm.

  Various fillers can also be blended with the resin composition for forming a resinous film, if necessary. For example, when at least one of calcium carbonate and talc is blended in the resin composition, various physical properties of the cable can be adjusted in a desired range. The compounding quantity of the filler in a resin composition (namely, film made of resin) is 10-30 mass%, for example, and 15-25 mass% is preferable.

  The separator 4 is spirally wound around the outer periphery of the insulator 3 or longitudinally attached. It is preferable that the resin film which comprises the separator 4 is a tape form. In order to prevent the insulator 3 from being exposed, the resin tape or the laminate of the resin tape may be spirally wound around the outer periphery of the insulator 3 or vertically disposed in the longitudinal direction. It can be covered.

<Sheath>
The sheath 5 is not particularly limited, but is generally formed of a soft vinyl chloride resin composition containing a polyvinyl chloride resin and a plasticizer from the viewpoint of flexibility, versatility and the like.

  Examples of polyvinyl chloride resins include polyvinyl chloride and copolymers of vinyl chloride with vinyl acetate, alkyl (meth) acrylate, maleic acid ester, ethylene, propylene, styrene, vinylidene chloride and the like. . One of these may be used alone, or two or more of these may be used in combination.

  The plasticizer can be appropriately selected from known plasticizers and used, but an ester plasticizer is preferable from the viewpoint of the effect of the present invention. Examples of ester plasticizers include phthalic acid ester plasticizers, phosphoric acid ester plasticizers, adipic acid ester plasticizers, azelaic acid ester plasticizers, sebacic acid ester plasticizers, and maleic acid plasticizers. And ester compounds such as fumaric acid ester plasticizers, trimellitic acid ester plasticizers, pyromellitic acid ester plasticizers, itaconic acid ester plasticizers, citric acid ester plasticizers, polyester plasticizers, etc. Among them, phthalic acid ester plasticizers, phosphoric acid ester plasticizers, adipic acid ester plasticizers and trimellitic acid ester plasticizers are preferable.

  In the insulator 3, the separator 4 and the sheath 5 described above, if necessary, a flame retardant, a lubricant, a stabilizer, a filler, a foaming agent, an antioxidant, a processing aid, a neutralizing agent, ultraviolet light Various known additives such as an absorbent, a pigment, an antistatic agent, a dispersant, a thickener, a metal deterioration inhibitor, an antifungal agent, and a flow control agent can also be blended.

  As a flame retardant, a brominated flame retardant, an inorganic flame retardant, a phosphoric acid flame retardant etc. are mentioned, for example. Examples of brominated flame retardants include organic brominated flame retardants such as brominated ethylene bis phthalimide derivatives, bis brominated phenyl terephthalamide derivatives, brominated bisphenol derivatives, 1,2-bis (bromophenyl) ethane, etc. Be As an inorganic type flame retardant, magnesium hydroxide, aluminum hydroxide, etc. are mentioned, for example. As a phosphoric acid type flame retardant, aromatic condensation phosphoric acid ester, ammonium polyphosphate, a melamine phosphate etc. are mentioned, for example.

  Examples of the lubricant include hydrocarbon lubricants, fatty acid lubricants, ester lubricants and the like.

  As the foaming agent, a known chemical decomposition type foaming agent or the like that generates carbon dioxide gas, nitrogen gas or the like by chemical decomposition can be used. For example, azo compounds such as azodicarbonamide (ADCA), N-N'- Examples include nitroso compounds such as dinitrosopentamethylenetetramine, hydrazine derivatives such as 4,4'-oxybis (benzenesulfonylhydrazide) (OBSH) and hydrazodicarbonamide (HDCA), sodium hydrogen carbonate and the like.

  Examples of the antioxidant include phenol-based antioxidants, amine-based antioxidants, phosphorus-based antioxidants, and the like.

  Examples of processing aids include paraffinic oils added to resin materials and the like, petroleum oils such as aromatic oils and naphthenic oils, and the like.

  As a ultraviolet absorber, a benzophenone series compound, a benzotriazole type compound, a salicylate type compound, a substituted tolyl type compound, a metal chelate type compound etc. are mentioned, for example.

  As the coloring agent, general inorganic pigments and organic pigments described in "Pigment Handbook (Edited by Japan Pigment Technology Association)" can be used. For example, as the inorganic pigment, (composite) metal oxides containing titanium such as titanium yellow, zinc oxide, iron oxide, zinc sulfide, antimony trioxide and the like can be mentioned. Examples of the organic pigment include pigments of phthalocyanine type, anthraquinone type, quinacridone type, azo type, isoindolinone type, quinophthalone type, perinone type, perylene type and the like.

  Examples of the antistatic agent include alkyl phosphoric acid esters and silicic acid compounds.

  Examples of the dispersant include acrylic dispersants, fatty acid ester dispersants, polyethylene glycol dispersants, nonionic surfactants, amphiphilic triphenylene derivatives, pyrene derivatives and the like.

  In the method of manufacturing the cable 1 according to the present invention, the insulator 3 is provided on the outer periphery of the conductor 2 using an extruder such as a single screw extruder or a twin screw extruder, for example, and the resin film is spirally wound on the outer periphery of the insulator 3 The outer periphery of the insulator 3 is covered to form the separator 4 and the sheath 5 is provided on the outer periphery of the separator 4 using an extruder. According to the above method, the separator 4 is provided between the sheath 5 and the insulator 3, and the separator 4 can prevent the plasticizer in the sheath 5 from migrating to the insulator 3.

  Hereinafter, the present invention will be further described by way of examples and comparative examples, but the present invention is not limited to the following examples. The term "parts" simply means "parts by mass".

The material used for cable production of the following example and a comparative example is as follows.
<Separator>
· (A1) Tape made of polyethylene (PE) (density 0.915 g / cm ³ )
・ (A2) Tape made of polyethylene (PE) (density 0.890 g / cm ³ )
・ (A3) Tape made of polypropylene (PP) (density 0.900 g / cm ³ )
· Tape made of (A4) polypropylene (PP) (density 0.880 g / cm ³ )
· (A5) Tape made of polyethylene terephthalate (PET) (density 1.320 g / cm ³ )

<Insulator>
-(B1) Polyethylene (PE) ("UBEC 540" manufactured by Ube Maruzen Polyethylene Corporation, density 0.922 g / cm ³ , MFR ³ g / 10 min)

<Sheath>
-(C1) Polyvinyl chloride (PVC) (base resin, "TK1700E" manufactured by Shin-Etsu Chemical Co., Ltd.)
・ (D1) Phthalate ester (plasticizer, manufactured by J-PLUS Inc. "DINP")
・ (E1) Ca / Zn stabilizer (stabilizer, made by ADEKA Co., Ltd. "RUP 151")
・ (F1) Calcium carbonate (filler, “Escaron # 2000” manufactured by Sanko Seimitsu Co., Ltd.)

(Examples 1 to 5 and Comparative Examples 1 to 6)
According to the formulation shown in Table 1, a cable 1 as shown in FIG. 1 was produced.
First, according to the compounding amount (mass part) shown in Table 1, the resin composition used for a sheath was produced. The resin composition was obtained by kneading the respective components in a kneader set at about 140 to 180 ° C.
The outer periphery of a copper wire having a diameter of 14.0 mm was coated with an insulator 3 having a thickness of 1.80 mm using an extrusion molding machine (“Lab Station” (trade name) manufactured by Plavender). Next, the insulator 3 was spirally wound (clamped) or vertically coated with a separator so as to have a thickness shown in Table 1. Thereafter, the sheath 5 was coated at a thickness of 1.50 mm using an extruder.

  The following evaluation was performed about each obtained cable. The results are shown in Table 1 together.

<Tension elongation and tensile strength>
The obtained cable 1 was left at 90 ° C. for 28 days for the purpose of promoting the migration of the plasticizer. Thereafter, the tensile elongation and tensile strength of the cable were measured in accordance with JIS C3005.
About tensile strength, 80 MPa or more was made into pass "(circle)", and less than 80 MPa was evaluated as rejection "x".
About tensile elongation, 80% or more was made into pass "(circle)", and less than 80% was evaluated as rejection "x".

From the results of Table 1, in the cables of Examples 1 to 5, since the material, density and thickness of the separator are set in the specific ranges specified in the present invention, migration of the plasticizer from the sheath to the insulator is suppressed As well as being excellent in flexibility, physical properties such as tensile elongation and tensile strength are also excellent.
On the other hand, Comparative Example 1 is an example in which the separator is not provided, Comparative Examples 2 and 6 have the thickness of the separator less than the lower limit defined in the present invention, and Comparative Examples 3-5 define the density of the separator in the present invention. Below the lower limit, the plasticizer transferred from the sheath to the insulator, and both tensile elongation and tensile strength could not be satisfied.

  The present invention is not limited to the above embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the embodiments described above, and appropriate modifications, improvements, etc. are possible. In addition, the material, shape, size, number, arrangement location, and the like of each component in the embodiment described above are arbitrary and not limited as long as the present invention can be achieved.

Here, the features of the embodiment of the cable according to the present invention described above will be briefly summarized and listed in the following <1> to <4>.
<1>
An insulator (3), a separator (4), and a sheath (5) made of a soft vinyl chloride resin composition are provided in this order on the outer periphery of the conductor (2),
The separator (4) is made of a resin film and is spirally wound around the outer periphery of the insulator (3) or longitudinally attached in the longitudinal direction.
The cable (1), wherein the resin film has a density of 0.900 g / cm ³ or more and a thickness of 0.025 mm or more.
<2>
In the cable (1) of the above <1>,
The cable (1), wherein the resin film comprises at least one resin selected from the group consisting of polyethylene resins, polypropylene resins, and polyester resins.
<3>
In the cable (1) of <1> or <2> above,
The soft vinyl chloride resin composition is at least one plastic selected from the group consisting of phthalic acid ester plasticizers, phosphoric acid ester plasticizers, adipic acid ester plasticizers and trimellitic acid ester plasticizers. A cable (1) characterized in that it contains an agent.
<4>
In the cable (1) according to any one of the above <1> to <3>,
Cable (1), characterized in that the resinous film contains at least one of calcium carbonate and talc.

1 Cable 2 Conductor 3 Insulator 4 Separator 5 Sheath

Claims (4)

An insulator, a separator, and a sheath made of a soft vinyl chloride resin composition are provided in this order on the outer periphery of the conductor,
The separator is made of a resin film and is helically wound around the outer periphery of the insulator or longitudinally attached to the insulator.
A cable characterized in that the resin film has a density of 0.900 g / cm ³ or more and a thickness of 0.025 mm or more.   The cable according to claim 1, wherein the resin film comprises at least one resin selected from the group consisting of polyethylene resins, polypropylene resins and polyester resins.   The soft vinyl chloride resin composition is at least one plastic selected from the group consisting of phthalic acid ester plasticizers, phosphoric acid ester plasticizers, adipic acid ester plasticizers and trimellitic acid ester plasticizers. The cable according to claim 1, wherein the cable comprises an agent.   The cable according to any one of claims 1 to 3, wherein the resin film contains at least one of calcium carbonate and talc.

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