JP2019179628A - Wiring material - Google Patents

Abstract

To provide a wiring material excellent in peeling processability while securing flexibility, even using an aluminum conductor as a conductor.SOLUTION: There is provided a wiring material having at least one insulation coating layer on an outer periphery of an aluminum conductor, in which an innermost insulation coating layer directly arranged on the outer periphery of the aluminum conductor of the insulation coating layer is a layer of a base resin containing at least one of an ethylene rubber and a styrene elastomer.SELECTED DRAWING: None

Description

  The present invention relates to a wiring material having an aluminum conductor.

Insulation coating layers or sheath materials are selected for wiring materials such as insulated wires, cables, cords, optical fiber cores, and optical fiber cords used for internal and external wiring of electrical and electronic equipment, depending on the application. . For example, when heat resistance is required, the insulating coating layer or sheath of the wiring member is usually formed of a heat-resistant resin or a crosslinked resin (for example, crosslinked polyvinyl chloride or crosslinked polyethylene). As such wiring materials, those having an insulating coating layer made of cross-linked polyvinyl chloride on the outer periphery of a copper wire as a conductor and those having a sheath made of cross-linked polyethylene have been frequently used.
Generally, a CV cable (cross-linked polyethylene insulated cable) in which a cross-linked polyethylene is used for an insulating coating layer and a PVC resin (polyvinyl chloride) is used for a sheath is used for a power cable and a distribution cable.
On the other hand, wiring materials using conductors (aluminum conductors) made of aluminum instead of copper conductors are used in the power and distribution fields from the viewpoint of resource scarcity, cost, and weight reduction. (For example, see Patent Document 1).

JP 2017-143645 A

However, since aluminum has a lower electrical conductivity than copper, it is necessary to increase the conductor diameter in order to pass the same current. Furthermore, the aluminum conductor is hard, and there are many problems such as being easily broken when scratched. When a CV cable using such an aluminum conductor is wired, the cable becomes hard, and therefore the cable splashes at the time of wiring, and is difficult to wire (inferior in flexibility).
In addition, the conventional CV cable is difficult to peel off the insulating coating layer from the conductor, and in particular, the CV cable using the aluminum conductor having the above-described problem is required to improve the peelability. That is, when the peeling process is performed, the aluminum conductor is easily damaged, and the aluminum conductor may be broken unless it is carefully processed. Further, in the peeling process, a linear body or a hair-like body (sometimes called a beard) of the insulating coating layer may remain on the cut end surface of the insulating coating layer. If such a beard remains, the beard will bite into the connector during connector processing, resulting in poor contact.
Moreover, since an aluminum conductor is very weak to a damage | wound, when peeling off an insulation coating layer, a blade cannot be bited in too much. Conventional cross-linked polyethylene cannot be peeled unless a blade is sufficiently inserted, and even in such a case, whiskers tend to remain. This must be removed by post-processing. Therefore, if the coating is removed without inserting too many blades, the productivity is greatly improved.

  The present invention provides a wiring material excellent in peeling workability (also referred to as ease of processing when peeling off an insulating coating layer, also called peelability) while ensuring flexibility even when an aluminum conductor is used as a conductor. The task is to do.

  The inventors of the present invention have provided a flexible wiring material by forming an insulating coating layer directly provided on the outer periphery of an aluminum conductor with a base resin layer containing at least one of ethylene rubber and styrene-based elastomer. And it was found that excellent peelability can be imparted. Based on this finding, the present inventors have further studied and have come to make the present invention.

That is, the subject of this invention was achieved by the following means.
<1> A wiring material having at least one insulating coating layer on the outer periphery of an aluminum conductor,
The wiring member in which the innermost insulating coating layer provided directly on the outer periphery of the aluminum conductor in the insulating coating layer is a base resin layer containing at least one of ethylene rubber and styrene-based elastomer.
<2> The wiring member according to <1>, wherein the base resin contains at least one resin selected from the group consisting of an ethylene-α-olefin copolymer, polyethylene, and polypropylene.
<3> The wiring material according to <2>, wherein the at least one resin is a crosslinked resin.
<4> The wiring material according to any one of <1> to <3>, wherein the base resin layer is a silanol condensation cured product of the following silane crosslinkable composition.
<Silane crosslinkable composition>
At least one of ethylene rubber and styrene-based elastomer, and at least one silane graft resin selected from the group consisting of ethylene-α-olefin copolymer resin, polyethylene, and polypropylene, in which a silane coupling agent is graft-bonded; The silane crosslinkable composition containing a silanol condensation catalyst <5> Any one of <1> to <4>, wherein the total content of the ethylene rubber and the styrene elastomer in the base resin is at least 5% by mass The wiring material according to item 1.
<6> The wiring material according to any one of <1> to <5>, wherein the base resin contains an organic mineral oil.
<7> The wiring material according to any one of <1> to <6>, wherein the insulating coating layer includes two or more layers, and the outermost insulating coating layer is a polyvinyl chloride insulating coating layer.

  In the present specification, a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.

  Even when an aluminum conductor is used as a conductor, the wiring material of the present invention has both flexibility and excellent peeling property, and can also achieve weight reduction.

[Wiring material]
The wiring material of the present invention has at least one insulating coating layer on the outer periphery of the aluminum conductor. Of the at least one insulating coating layer (hereinafter, simply referred to as a coating layer), the innermost insulating coating layer provided directly on the outer periphery of the aluminum conductor is a base containing at least one of ethylene rubber and styrene elastomer. It is formed of a resin layer.
The base resin layer is a polyolefin copolymer having at least one of ethylene rubber and styrene-based elastomer, an ethylene-α-olefin copolymer, polyethylene, polypropylene, and an acid copolymerization component (including an acid ester copolymerization component). A base resin layer containing at least one resin selected from the group consisting of (hereinafter referred to as an ethylene-based component-containing resin) is preferred. In this case, the innermost insulating coating layer may be a layer made of a non-cross-linked product of the base resin, but is preferably a layer made of a cross-linked product of the base resin from the viewpoint of heat resistance. Here, the cross-linked product of the base resin means a cross-linked product obtained by cross-linking the ethylene-based component-containing resin among the resins contained in the base resin (the ethylene-based component-containing resin becomes the cross-linked resin). The ethylene-based component-containing resin to be cross-linked may be a part of the total amount of the ethylene-based component-containing resin to be used, and can be determined as appropriate depending on the application. In the cross-linked product of the base resin, the ethylene rubber and the styrene-based elastomer are usually not cross-linked with other resins, but may be cross-linked within a range not impairing the effects of the present invention. As a method for crosslinking an ethylene-based component-containing resin, a known resin crosslinking method (for example, a chemical crosslinking method using an electron beam crosslinking, a crosslinking agent, a crosslinking catalyst, or the like) can be applied without particular limitation. The silane cross-linking method described later is preferable in that it does not require.

  In the present invention, being directly provided on the outer periphery of the aluminum conductor means that the outer periphery of the aluminum conductor is in contact with the outer periphery of the aluminum conductor without interposing an adhesive layer, a primer layer, or another insulating coating layer. It means that it is provided.

Although the details of the reason why the wiring material having the aluminum conductor and the innermost insulating coating layer formed of the base resin layer has flexibility and excellent peeling properties are not yet clear, it is considered as follows. .
That is, the cross-linked polyethylene coated on the outside of the aluminum conductor, which is a conventional configuration, is integrated with the aluminum conductor to promote the hardness of the aluminum conductor. Moreover, since the aluminum conductor is normally increased in size (increased in diameter) because the conductor resistance is smaller and the allowable current is smaller than the copper conductor, the wiring material itself is hardened. Furthermore, since the crosslinked polyethylene layer is hard and difficult to insert the blade, and the material is further extended, it cannot be peeled unless the blade is inserted to the vicinity of the conductor.
However, in the wiring material of the present invention, the portion that is in direct contact with the aluminum conductor (the innermost insulating coating layer) is formed of the base resin layer, so that the hardness of the aluminum conductor is reduced and the stress acting during wiring It is also possible to reduce the repulsion of the wiring material against. Specifically, when cutting the coating layer, the coating layer is peeled off (cut or removed) without leaving a whisker that causes an increase in contact resistance without having to insert the blade to the edge of the aluminum conductor. ). In addition, aluminum has a small specific gravity and can be reduced in weight relative to a wiring material provided with a copper conductor.
Further, as a preferred embodiment of the wiring material of the present invention, when the innermost insulating coating layer is formed of a layer made of a cured product of a base resin, and further a layer made of a silanol condensation cured product of a silane crosslinkable composition described later, the wiring material In addition, cured products, particularly silanol condensation cured products, have excellent heat resistance in a short period (for example, against an instantaneous high temperature of the environmental atmosphere), are difficult to melt, and have a long period (for example, a continuous or intermittent high temperature in the environmental atmosphere). The heat resistance can be improved, and the wiring material can be reduced in diameter.

  Since the wiring material of the present invention exhibits excellent peeling workability, the embodiment is a wiring material before being peeled (unpeeled) and the coating layer as desired by the excellent peeling workability. And a mode in which the wiring material is removed (peeled).

The insulated electric wire that can be used as the wiring material of the present invention may be an electric wire having at least one insulating coating layer on the outer periphery of the aluminum conductor. The aluminum conductor may be a single wire or an aluminum stranded wire described later.
The cable that can be used as the wiring material of the present invention usually has two or more insulating coating layers on the outer periphery of an aluminum conductor, and the outermost insulating coating layer (of the two or more insulating coating layers) The outermost insulating coating layer) has a form surrounding an aluminum conductor and other insulating coating layers. For example, there is a cable in which one or a plurality of insulated wires having an innermost insulating coating layer on the outer periphery of an aluminum conductor are collectively surrounded by an outermost insulating coating layer called a sheath. In this cable, when having a plurality of insulated wires, the plurality of insulated wires may be arranged in parallel, or may be arranged in a twisted manner (stranded wire). The number of the insulated wires, the arrangement of the insulated wires, the twist direction, the twist pitch, and the like when twisting the insulated wires can be set as appropriate according to the application.

  The diameter of the wiring material can be appropriately determined according to the application and the like, and is not particularly limited. For example, when used as an insulated wire, 0.8 to 35 mm is preferable and 1 to 30 mm is more preferable in terms of strength and flexibility. When using as a cable, 0.8-50 mm is preferable and 1-35 mm is more preferable at the point of intensity | strength and a softness | flexibility.

  The wiring material of the present invention is mainly used as an alternative electric wire or cable of a CV cable that is a power distribution cable, and is also suitable as a cabtyre cable, a cord, a railway cable, solar light or wind power generation cable, an aircraft cable, or the like. Used for.

<Aluminum conductor>
The aluminum conductor used in the present invention is not particularly limited as long as it is an aluminum conductor. For example, a conductor composed of one aluminum strand or a stranded wire (aluminum stranded wire) formed by twisting a plurality of aluminum strands. Also, a conductor made of).

As an aluminum strand, what was conventionally used for a wiring material can be used, for example, the strand formed with (pure) aluminum or aluminum alloy can be used. Although it does not restrict | limit especially as an aluminum alloy, For example, 1000 series aluminum alloy, 2000 series aluminum alloy, 3000 series aluminum alloy, 4000 series aluminum alloy, 5000 series aluminum alloy, 6000 series aluminum alloy etc. are mentioned, typically And an aluminum alloy containing Fe of 0.6 mass% or less, Si of 0.2 to 1.0 mass%, Mg of 0.2 to 1.0 mass%, and the balance of aluminum and inevitable impurities. It is done.
Among aluminum and aluminum alloys, 1000 series aluminum alloys having an aluminum purity of 99% or more are preferable, and those having high electrical conductivity are preferable.
The cross-sectional shape of the aluminum strand can be determined as appropriate according to the application, and examples thereof include a round shape (circular shape), a rectangular shape (rectangular shape), and a hexagonal shape. In the present invention, for example, a circular cross section is preferable in that a stranded wire can be easily formed.

The number of aluminum strands forming the stranded wire is not particularly limited as long as it is plural (two or more).
The arrangement, twist direction, twist pitch, and the like of the aluminum strands when the aluminum strands are twisted together can be set as appropriate according to the application.
In order to suppress the outer diameter of the aluminum stranded wire, it is preferable to use a rolled conductor that is further squeezed with a die after twisting.

The outer diameter of the aluminum wire can be appropriately determined according to the use etc., but is preferably 0.15 to 3.5 mm, more preferably 0.3 to 3 mm in terms of strength and flexibility. More preferably, it is 35 to 2.5 mm.
The outer diameter of the aluminum stranded wire can be appropriately determined according to the use etc., but is preferably 0.8 to 45 mm, more preferably 1 to 35 mm, and further preferably 1 to 30 mm in terms of strength and flexibility. preferable. The outer diameter of the aluminum stranded wire is the diameter of a virtual circumscribed circle circumscribing the outer peripheral surface of the plurality of aluminum strands arranged outside in the cross section perpendicular to the axis of the stranded wire. Although the outer diameter and conductor cross-sectional area of the aluminum strand are determined by the allowable current, the thinner the aluminum wire diameter per one wire, the better the flexibility, but the core wire (element wire) is likely to break. From this viewpoint, the wire diameter is particularly preferably about 0.3 to 1 mm.

<Insulation coating layer>
The insulating coating layer provided on the outer periphery of the aluminum conductor functions as an insulating layer and has a single layer structure or a multilayer structure.
When the insulating coating layer is a single layer, this insulating coating layer is the innermost insulating coating layer provided in direct contact with the outer periphery of the aluminum conductor.
On the other hand, when the insulating coating layer has a multilayer structure (referred to as a multilayer insulating coating layer), the number of constituent layers constituting the multilayer insulating coating layer can be determined as appropriate according to the application, 2-5 layers are preferable, and 2 layers or 3 layers are more preferable. In particular, when the wiring material is a cable, the insulating coating layer is preferably a multilayer insulating coating layer, and the constituent layer (outermost insulating coating layer) located on the outermost side in the multilayer insulating coating layer functions as a sheath. . In the multilayer insulating coating layer, it is preferable that the layers are directly laminated without interposing another layer such as an adhesive layer.
In the present invention, for convenience, a wiring material having a single insulating coating layer (innermost insulating coating layer) is referred to as an insulated wire, and a wiring material having a multilayer insulating coating layer, particularly an outermost insulating coating layer (sheath) is cabled. However, as described above, even an insulated wire includes a form having a multilayer insulation coating layer.

  In the present invention, when layers made of the same material (components and content) are formed as the material for forming the insulating coating layer, these layers are combined and counted as one layer. On the other hand, even if the material for forming the insulating coating layer is a layer formed of the same material, when the layers are not stacked adjacent to each other, that is, when stacked through other layers, each layer is counted as one layer. To do. When layers formed of different materials for forming the insulating coating layer are stacked, each layer is counted as one layer regardless of whether or not they are adjacent to each other.

− Innermost insulation coating layer −
The innermost insulating coating layer (hereinafter sometimes simply referred to as the innermost coating layer) is formed of a base resin layer described later, preferably a layer made of a cured product of the base resin, and more preferably described later. The silane crosslinkable composition is formed of a silanol condensation cured product layer (sometimes referred to as a cured product layer) formed by a silanol condensation reaction. This cured product layer is a hydrolyzable silane coupling agent bonded to a silane graft resin for a silane crosslinkable composition containing at least one of ethylene rubber and styrene elastomer, a silane graft resin, and a silanol condensation catalyst. A group is hydrolyzed and then crosslinked by silanol condensation reaction.

− Outermost insulation coating layer −
The outermost insulating coating layer (also simply referred to as the outermost coating layer or the surface layer) is formed of a known resin used for the wiring material, and examples thereof include a thermoplastic resin and a thermosetting resin described later.

− Intermediate insulation coating layer −
When the insulating coating layer is a multilayer insulating coating layer of three or more layers, the intermediate insulating coating layer provided between the innermost coating layer and the outermost coating layer is formed of a known resin used for the wiring material, For example, the thermoplastic resin and thermosetting resin mentioned later are mentioned.

− Thickness of insulation coating layer −
The thickness of the insulating coating layer can be appropriately determined according to the diameter, use, etc. of the wiring material. For example, the total thickness of the coating layer (in the case of a multilayer coating layer, the total thickness of each constituent layer) is preferably 0.2 to 10 mm in terms of heat resistance, dielectric strength, strength and flexibility, and 6 to 5 mm is more preferable.
The thickness of each constituent layer can also be appropriately determined according to the total thickness of the coating layer, the diameter of the wiring material, the application, and the like. For example, when used as an insulated wire, the thickness of the innermost coating layer is preferably 0.2 to 5 mm, more preferably 0.5 to 4 mm, and when used as a cable, for example, 0.4 to 5 mm is preferable. 0.5 to 3 mm is more preferable. In the present invention, the thickness of the innermost coating layer is the difference (the thinnest thickness) between the outer diameter of the aluminum conductor and the outer diameter of the innermost coating layer. For example, the thickness of the outermost coating layer is preferably 0.2 to 5 mm, and more preferably 0.5 to 4 mm. The (total) thickness of the intermediate insulating coating layer is preferably, for example, 0 to 5 mm.

[Manufacturing method of wiring material]
First, each component used for the manufacturing method of a wiring material is demonstrated.
<Aluminum conductor>
A commercially available aluminum conductor may be used as the aluminum conductor used in the present invention. The aluminum stranded wire may be produced by twisting commercially available aluminum strands by a known method.

<Base resin>
The base resin used in the present invention contains at least one of ethylene rubber and styrene elastomer. When the base resin contains at least one of ethylene rubber and styrene-based elastomer, the balance with the strength of the aluminum conductor can be improved.
The base resin preferably contains an ethylene component-containing resin in addition to the ethylene rubber and the styrene elastomer. The base resin may contain other resins other than ethylene rubber, styrene elastomers and ethylene component-containing resins, and further contains other resins, organic mineral oils, plasticizers, etc. as necessary. Also good.

(Ethylene rubber)
The ethylene rubber is not particularly limited as long as it is a copolymer rubber of ethylene and α-olefin. For example, the ethylene rubber is preferably a binary copolymer rubber of ethylene and α-olefin (preferably having 1 to 12 carbon atoms), ethylene and α-olefin (preferably having 1 to 12 carbon atoms) and α-. Examples thereof include rubbers made of a terpolymer with a third component having an unsaturated bond other than olefins. Examples of the third component include conjugated or non-conjugated dienes. Specifically, butadiene, isoprene, 1,3-pentadiene, 2,3-dimethyl-1,3-butadiene, dicyclopentadiene (DCPD), Examples include ethylidene norbornene (ENB) and 1,4-hexadiene. Examples of the binary copolymer rubber include ethylene-propylene rubber (EPM), and examples of the terpolymer rubber include ethylene-propylene-diene rubber (EPDM).
Ethylene rubber may be used alone or in combination of two or more.

(Styrene elastomer)
Styrenic elastomers are those having an aromatic vinyl compound as a constituent component in the molecule. Examples of such styrenic elastomers include block copolymers and random copolymers of conjugated diene compounds and aromatic vinyl compounds, or hydrogenated products thereof. Examples of such styrene-based elastomers include styrene-ethylene-butylene-styrene block copolymer (SEBS), styrene-isoprene-styrene block copolymer (SIS), hydrogenated SIS, and styrene-butadiene-styrene block copolymer. Polymer (SBS), hydrogenated SBS, styrene-ethylene-ethylene-propylene-styrene block copolymer (SEEPS), styrene-ethylene-propylene-styrene block copolymer (SEPS), styrene-butadiene rubber (SBR), Examples thereof include hydrogenated styrene-butadiene rubber (HSBR).
Styrenic elastomers may be used alone or in combination of two or more.

(Ethylene component-containing resin)
The base resin preferably contains an ethylene-based component-containing resin, in the presence of radicals generated from organic peroxides, which will be described later, the graft reaction site of the silane coupling agent and the graft reaction site in the main chain or its part. It has a terminal and can be condensed (crosslinked) by a silane crosslinking method. Examples of the site capable of grafting include an unsaturated bond site of a carbon chain, a carbon atom having a hydrogen atom, and the like.
The ethylene component-containing resin is at least one resin selected from the group consisting of an ethylene-α-olefin copolymer, polyethylene, polypropylene, and a polyolefin copolymer having an acid copolymer component, and ethylene-α- The resin is preferably at least one resin selected from the group consisting of an olefin copolymer, polyethylene and polypropylene.
As the ethylene-based component-containing resin and each resin described later, one kind may be used alone, or two or more kinds may be used.

− Polyethylene resin −
The polyethylene resin may be a polymer resin containing an ethylene constituent component, and excludes a homopolymer of ethylene and a copolymer of ethylene and an α-olefin (preferably 5 mol% or less) (corresponding to polypropylene). And a resin comprising a copolymer of ethylene and a non-olefin (preferably 1 mol% or less) having only carbon, oxygen and hydrogen atoms in the functional group. In addition, the above-mentioned α-olefin and non-olefin can be used without particular limitation as well-known ones conventionally used as a copolymerization component of polyethylene.
Examples of the polyethylene resin include high density polyethylene (HDPE), low density polyethylene (LDPE), ultra high molecular weight polyethylene (UHMW-PE), linear low density polyethylene (LLDPE), and very low density polyethylene (VLDPE). Among these, low density polyethylene, linear low density polyethylene or ultra-low density polyethylene is preferable, and low density polyethylene or linear low density polyethylene is more preferable.

− Polypropylene resin −
The polypropylene resin may be a polymer resin containing a propylene constituent component as a main component, and a resin such as a propylene homopolymer (homopolypropylene resin), an ethylene-propylene random copolymer, an ethylene-propylene block copolymer, or the like. Can be used.

− Ethylene-α-olefin copolymer resin −
The ethylene-α-olefin copolymer resin is preferably a resin of a copolymer of ethylene and an α-olefin having 3 to 12 carbon atoms (excluding those corresponding to the above polyethylene and polypropylene). .

− Polyolefin copolymer resin with acid copolymerization component −
The acid copolymerization component (including the acid ester copolymerization component) in the polyolefin copolymer resin having an acid copolymerization component is not particularly limited, but a carboxylic acid compound such as (meth) acrylic acid, vinyl acetate, or Acid ester compounds such as alkyl (meth) acrylate (preferably having 1 to 12 carbon atoms) can be mentioned. Examples of the polyolefin copolymer resin having an acid copolymer component include ethylene-vinyl acetate copolymer (EVA), ethylene- (meth) acrylic acid copolymer, ethylene- (meth) acrylic acid alkyl copolymer, and the like. Each resin is mentioned. Among them, ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, and ethylene-butyl acrylate copolymer are preferable, acceptability to inorganic fillers and heat resistance. From the viewpoint of properties, an ethylene-vinyl acetate copolymer resin is more preferable.

  The above polyolefin resins, particularly polyethylene resins, polypropylene resins, ethylene-α-olefin copolymer resins, and polyolefin copolymer resins having an acid copolymerization component, may each be acid-modified. The acid used for acid modification of these resins is not particularly limited as long as it is an acid usually used for acid modification of resins, and examples thereof include unsaturated carboxylic acids.

(Other resins)
Examples of other resins that the base rubber may contain include resins used for the insulating coating layer of the wiring material. For example, acrylic rubber, polyester elastomer, polyamide elastomer and the like can be mentioned.

(Organic mineral oil)
Examples of the organic mineral oil include aromatic oils, paraffin oils, naphthenic oils, and mixed oils including these three. As the organic mineral oil, those usually used in the resin composition can be used without particular limitation, and paraffinic oil or naphthenic oil is preferable. An organic mineral oil may be used individually by 1 type, and may use 2 or more types together.

(Base resin content)
The total content of ethylene rubber and styrene-based elastomer in the base resin is preferably 5% by mass or more, more preferably 10% by mass or more, and still more preferably 15% by mass or more. The lower limit of the total content is less than 100% by mass, preferably 70% by mass or less, and more preferably 60% by mass or less.
The content of ethylene rubber or styrene-based elastomer in the base resin is appropriately set within a range that satisfies the above total content. For example, the content of ethylene rubber and styrene elastomer is preferably 5 to 40% by mass, and more preferably 10 to 30% by mass. The content of the styrene elastomer is preferably 20% by mass or more from the viewpoint of peelability (suppression of whisker generation).

The total content of the ethylene-based component-containing resin in the base resin is not particularly limited, but is preferably 30 to 95% by mass, more preferably 50 to 90% by mass, and still more preferably 55 to 85% by mass. This ethylene component-containing resin is preferably contained as the main component of the base resin (the maximum content component in the base resin).
In the present invention, the content of each of the resins included in the ethylene-based component-containing resin in the base resin is appropriately set within a range that satisfies the content of the ethylene-based component-containing resin. Set to content. For example, the content of the polyethylene resin is preferably 0 to 95% by mass, and more preferably 0 to 70% by mass. 0-40 mass% is preferable and, as for the content rate of a polypropylene resin, 2-30 mass% is more preferable. 0-95 mass% is preferable and, as for the content rate of ethylene-alpha-olefin copolymer resin, 0-70 mass% is more preferable. 0-30 mass% is preferable and, as for the content rate of polyolefin copolymer resin which has an acid copolymerization component, 0-10 mass% is more preferable.

The content of other resins in the base resin can be appropriately set as long as the effects of the present invention are not impaired.
The content of organic mineral oil in the base resin (when the base resin contains a plasticizer, the total content with the plasticizer) is not particularly limited, but is preferably 0 to 40% by mass.

<Inorganic filler>
The base resin layer may contain an inorganic filler.
An inorganic filler will not be restrict | limited especially if it is normally used for the conventional resin composition.
When the base resin layer of the wiring material of the present invention is a silanol condensation-cured product, the inorganic filler has, on its surface, a hydrolyzable silyl group of a silane coupling agent described later, a hydrogen bond or a covalent bond, or an intermolecular bond. Therefore, those having a site capable of chemical bonding are preferred. Examples of the site capable of chemically bonding to the hydrolyzable silyl group include an OH group (hydroxyl group, hydrated or crystallized water molecule, OH group such as carboxy group), amino group, and SH group.
Examples of the inorganic filler include aluminum hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, calcium silicate, magnesium silicate, calcium oxide, magnesium oxide, aluminum oxide, aluminum nitride, aluminum borate whisker, and hydrated aluminum silicate. And metal hydrates such as hydrated magnesium silicate, basic magnesium carbonate, hydrotalcite, talc and other compounds having hydroxyl groups or crystal water. Boron nitride, silica (crystalline silica, amorphous silica, etc.), carbon, clay, zinc oxide, tin oxide, titanium oxide, molybdenum oxide, antimony trioxide, silicone compound, quartz, zinc borate, white carbon, Also included are zinc borate, zinc hydroxystannate, zinc stannate and the like.
The inorganic filler preferably contains at least one selected from the group consisting of metal hydrates, silica, calcium carbonate and clay, and more preferably at least one selected from this group.

As the inorganic filler, those treated with various surface treatment agents can be used. For example, as magnesium hydroxide surface-treated with a silane coupling agent, Kisuma 5L, Kisuma 5P (both trade names, manufactured by Kyowa Chemical Industry Co., Ltd.) and the like can be mentioned.
An inorganic filler may be used individually by 1 type, and may use 2 or more types together.

  When the inorganic filler is used as a powder, the average particle size is preferably 0.2 to 10 μm, more preferably 0.3 to 8 μm, still more preferably 0.4 to 5 μm, It is especially preferable that it is 0.4-3 micrometers. When the average particle size of the inorganic filler is in the above range, a molded body having a non-smooth appearance can be obtained by preventing secondary aggregation, and sufficient crosslinking is maintained while maintaining a bond with the silane coupling agent. Can be formed. The average particle size of the inorganic filler is determined by an optical particle size measuring device such as a laser diffraction / scattering type particle size distribution measuring device after dispersing the inorganic filler in alcohol or water.

  When the base resin layer of the wiring material of the present invention is a cross-linked product of the base resin, it may contain an inorganic filler, an additive, and the like. In forming this cross-linked product, an inorganic filler, an organic peroxide, etc. A crosslinking agent or a crosslinking aid can be used. Further, when the base resin layer of the wiring material of the present invention is a silanol condensation-cured product, it may contain an inorganic filler, an additive, and the like. It is preferable to use a coupling agent, a silanol condensation catalyst, a carrier resin, an inorganic filler, an additive, and the like.

<Organic peroxide>
Organic peroxide generates radicals at least by thermal decomposition, and as a catalyst, grafting reaction by radical reaction of silane coupling agent to ethylene component-containing resin (grafting reaction site of silane coupling agent and base resin) It is a covalent bond forming reaction with a site capable of undergoing grafting reaction, and is also called (radical) addition reaction).
As the organic peroxide, those having the above functions and used in radical polymerization or conventional silane crosslinking methods can be used without particular limitation. For example, benzoyl peroxide, dicumyl peroxide (DCP), 2,5-dimethyl-2,5-di- (tert-butylperoxy) hexane or 2,5-dimethyl-2,5-di- (tert- Butylperoxy) hexyne-3 is preferred.
The decomposition temperature of the organic peroxide is preferably from 80 to 195 ° C, particularly preferably from 125 to 180 ° C. In the present invention, the decomposition temperature of an organic peroxide means a temperature at which a decomposition reaction occurs in two or more compounds at a certain temperature or temperature range when an organic peroxide having a single composition is heated. means. Specifically, it refers to the temperature at which heat absorption or heat generation starts when heated from room temperature in a nitrogen gas atmosphere at a rate of temperature increase of 5 ° C./min by thermal analysis such as DSC method.
One type of organic peroxide may be used, or two or more types may be used.

<Silane coupling agent>
As the silane coupling agent, in the presence of radicals generated by the decomposition of the organic peroxide, a site (group or atom) that can be grafted to the site where the ethylene-based component-containing resin can be grafted, and silanol condensation It will not specifically limit if it has a hydrolyzable silyl group which can be. As such a silane coupling agent, the silane coupling agent currently used for the conventional silane crosslinking method is mentioned.
Examples of such silane coupling agents include silane coupling agents having an ethylenically unsaturated group as a site capable of grafting reaction, and specifically include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltributoxy. Examples include silane, vinyldimethoxyethoxysilane, vinyldimethoxybutoxysilane, vinyldiethoxybutoxysilane, allyltrimethoxysilane, allyltriethoxysilane, vinyltriacetoxysilane, and other vinylsilanes, and (meth) acryloxysilane. Among these, vinyltrimethoxysilane or vinyltriethoxysilane is particularly preferable.
One type of silane coupling agent may be used, or two or more types may be used.
The silane coupling agent may be used as it is or in a form diluted with a solvent.

<Silanol condensation catalyst>
The silanol condensation catalyst causes a silanol condensation reaction (promotion) of a silane coupling agent grafted to an ethylene-based component-containing resin in the presence of water. Based on the action of this silanol condensation catalyst, the ethylene-based component-containing resin is crosslinked via a silane coupling agent. As a result, a silane cross-linked resin molded article having excellent heat resistance can be obtained.
Such a silanol condensation catalyst is not particularly limited, and examples thereof include organic tin compounds, metal soaps, platinum compounds and the like. Examples of the organic tin compound include dibutyltin dilaurate, dioctyltin dilaurate, dibutyltin dioctiate, and dibutyltin diacetate.
One type of silanol condensation catalyst may be used, or two or more types may be used.

<Carrier resin>
In forming the silanol condensation cured product, the silanol condensation catalyst may be used as it is, but can be used as a mixture (condensation catalyst master batch) with a resin. The resin that is melt-kneaded (supported) with the silanol condensation catalyst (referred to as carrier resin) is not particularly limited, and each resin described in the above base resin can be used, but the number of master batches can be reduced (productivity). In terms of improvement, at least one of ethylene rubber and styrene-based elastomer is preferable, and when used in combination with an inorganic filler, a polyethylene resin is preferable.
A part of the base resin can be used as the carrier resin (for example, the base resin can be used separately in step (a) and step (b-2) or step (b-3) described later). In this case, the carrier resin can be used in an amount of 1 to 60 parts by mass, more preferably 2 to 50 parts by mass, and further preferably 2 to 40 parts by mass in 100 parts by mass of the base resin.
One type of carrier resin may be used, or two or more types may be used.

<Additives>
In the present invention, various additives can be used. Examples of the additive include various additives generally used in wiring materials and the like. Examples of such additives include antioxidants, crosslinking aids, lubricants, metal deactivators, and flame retardant (auxiliary) agents.
Although it does not restrict | limit especially as antioxidant, For example, a benzimidazole antioxidant, an amine antioxidant, a phenolic antioxidant, a sulfur type antioxidant, a hydrazine type antioxidant, etc. are mentioned.

<Silane crosslinkable composition>
When the innermost coating layer of the wiring material of the present invention is formed of a silanol condensation-cured layer, a silane crosslinkable composition is used.
This silane crosslinkable composition contains at least one of ethylene rubber and a styrene elastomer, at least one silane graft resin of an ethylene component-containing resin graft-bonded with a silane coupling agent, and a silanol condensation catalyst. Preferably, an inorganic filler or the like can be contained. The silane crosslinkable composition includes a base resin containing at least one of ethylene rubber and styrene elastomer and an ethylene component-containing resin, a silane coupling agent grafted to the ethylene component-containing resin, and a silanol condensation catalyst. It can also be said that it preferably contains an inorganic filler or the like.
This composition may contain components other than the ethylene rubber and the styrene-based elastomer described in the above base resin.

In the presence of radicals generated from organic peroxides, the silane graft resin is obtained by grafting a graft reaction site of the silane coupling agent and a site capable of grafting reaction of the ethylene-based component-containing resin. It is a resin in which a silane coupling agent is bonded to a system component-containing resin in the form of a graft chain by a covalent bond or the like.
As the silane graft resin, a commercially available product or a synthetic product may be used. The silane graft resin can be synthesized by grafting reaction of an ethylene-based component-containing resin and a silane coupling agent in the presence of an organic peroxide. For the grafting reaction, usual methods and conditions can be employed.

  Content of each component in a silane crosslinkable composition is not restrict | limited in particular, According to a use etc., it sets suitably. Content of each component is set with respect to 100 parts by mass of the base resin. 100 parts by mass of the base resin means the total amount of ethylene rubber, styrene elastomer, ethylene component-containing resin (before the silane coupling agent is grafted and bonded), other resins, and organic mineral oil.

In the silane crosslinkable composition, the content of each component constituting the base resin in the base resin is as described above.
The content of the silane coupling agent in the silane crosslinkable composition is preferably 1 to 15 parts by weight, more preferably 3 to 12 parts by weight, and more preferably 4 to 12 parts by weight with respect to 100 parts by weight of the base resin. . When the silane coupling agent is grafted to the ethylene-based component-containing resin, the content of the silane coupling agent is a content converted to the content of the silane coupling agent before the grafting reaction.
The content of the silanol condensation catalyst in the silane crosslinkable composition is preferably 0.01 to 0.6 parts by mass, more preferably 0.001 to 0.4 parts by mass with respect to 100 parts by mass of the base resin. is there.
The silane crosslinkable composition preferably contains an inorganic filler. In this case, the content of the inorganic filler is preferably 10 to 400 parts by mass and more preferably 30 to 280 parts by mass with respect to 100 parts by mass of the base resin. The blending amount of the inorganic filler is preferably less than 100 parts by mass from the viewpoint of peelability (suppression of remaining cutting residue).

  In preparing a silane crosslinkable composition, when several kinds of master batches (hereinafter sometimes referred to as MBs) are used, the amount of components used for the preparation of each MB is the same as the content of the silane crosslinkable composition as a whole. If it is the compounding quantity which satisfy | fills, it will not restrict | limit in particular, It determines suitably. For example, when blending the ethylene-based component-containing resin in both the silane MB and the condensation catalyst MB described later, the blending amount of the ethylene-based component-containing resin used in both MBs is a total in the base resin used in the silane crosslinkable composition. The blending amount of each MB can be appropriately set so as to satisfy the above-described content.

<Manufacturing method of wiring material>
The wiring material of the present invention can be manufactured by kneading (melting and mixing) a base resin or a resin composition containing the base resin, and then placing it on the outer periphery of the aluminum conductor. As a method for disposing the base resin or the resin composition on the outer periphery of the aluminum conductor, a normal method can be applied without particular limitation. For example, a method of forming a base resin or a resin composition on the outer periphery of an aluminum conductor, a method of applying or baking a varnish of a base resin or a resin composition on the outer periphery of an aluminum conductor, and the like can be given. In the present invention, a molding method is preferred, and a method for producing a wiring material by extruding a base resin or a resin composition will be described below.

The melt kneading method of the base resin or the resin composition is not particularly limited as long as it is a method usually used for rubber, plastic and the like. For example, when an inorganic filler is used, the kneading apparatus is appropriately selected according to the amount of the inorganic filler used. Specifically, a single screw extruder, a twin screw extruder, a roll, a Banbury mixer, various kneaders, etc. are mentioned. Among these, a closed mixer such as a Banbury mixer and various kneaders is preferable in terms of resin dispersibility. The kneading conditions are usually set to a temperature equal to or higher than the temperature at which the base resin or the resin composition melts. The kneading conditions are appropriately set according to the resin used, and can be preferably set to 80 to 250 ° C., for example. Moreover, before melt-kneading, if necessary, mixing, for example, dry blending, can be performed while the base resin is not melted. The mixing temperature is preferably 10 to 60 ° C., more preferably room temperature (25 ° C.), and can be set to a condition of several minutes to several hours.
The mixing method of the base resin is not particularly limited. For example, each component, for example, a resin component such as ethylene rubber, a styrene elastomer, an ethylene component-containing resin, an organic mineral oil, or the like may be mixed separately. Also, the mixing method of the resin composition is not particularly limited, and the base resin may be prepared in advance and then mixed with other components, or each component constituting the base resin may be mixed separately. Moreover, a masterbatch may be produced using a part of the components constituting the base resin or resin composition, dry blended before extrusion, and mixed in an extruder.

Next, the obtained base resin or resin composition is molded (coating molding) on the outer periphery of the aluminum conductor.
The molding method is not particularly limited as long as it is a method capable of molding the base resin or the resin composition into the shape of the innermost coating layer. The extrusion molding method using an extruder, the extrusion molding method using an injection molding machine, etc. The molding method using the molding machine is mentioned, and the extrusion molding method which extrudes simultaneously with the aluminum conductor is preferable. The molding temperature is set to the above temperature at which the base resin or the resin composition melts according to the conditions of the type of the base resin or resin composition and the extrusion speed (take-off speed).

  The kneading step and the molding step can be performed simultaneously or continuously using an extruder or the like. For example, a series of steps in which each component is introduced into an extruder (coating apparatus), melt-kneaded (preparation of base resin or resin composition), and then coated on the outer periphery of the aluminum conductor can be employed.

As described above, the base resin layer molded into the shape of the innermost coating layer can be coated on the outer peripheral surface of the aluminum conductor.
In the present invention, the innermost coating layer surface thus formed can be cross-linked by irradiation with an electron beam. When the innermost coating layer is chemically cross-linked, the base resin or resin composition containing a cross-linking agent, a cross-linking catalyst, or the like is subjected to a cross-linking treatment by an ordinary method and conditions during or after extrusion coating, as will be described later. .
Thus, the wiring material of the present invention having a single coating layer (innermost coating layer) can be manufactured.

When the wiring material of the present invention has a multilayer coating layer, the wiring material can be produced by forming a required number of constituent layers (intermediate insulating coating layer and outermost coating layer) sequentially on the outer peripheral surface of the innermost coating layer.
The material for forming the constituent layer is not particularly limited as long as it is usually used for a wiring material, and an organic resin is preferable. Examples of the organic resin include various thermoplastic resins and thermosetting resins. For example, polyvinyl chloride, polyamide, polyphenylene sulfide (PPS), polyetherketone (PEK), polyaryl other than the base resin described above. Ether ketone (PAEK), tetrafluoroethylene / ethylene copolymer (ETFE), polyether ether ketone (including PEEK and modified PEEK), polyether ketone ketone (PEKK), polyethylene terephthalate (PET), polyamideimide (PAI) ), Polyimide (PI), polyester (PEst), polyurethane, polyester elastomer, polyolefin elastomer, polyamide elastomer, fluororesin, fluororubber, acrylic rubber and the like. An organic resin may be used individually by 1 type, or may use 2 or more types. The organic resin may contain various commonly used additives.
Of the constituent layers, the outermost coating layer is preferably formed of polyvinyl chloride. The polyvinyl chloride that forms the outermost coating layer is more preferably soft polyvinyl chloride. For example, 35 to 70 parts by mass of a plasticizer that is usually used and 100 to 70 parts by mass of an inorganic filler with respect to 100 parts by mass of polyvinyl chloride. And a PVC composition containing a part.
The method for forming the constituent layers is the same as the method for disposing the base resin or the resin composition on the outer periphery of the aluminum conductor.

(Method for producing a wiring material having an innermost coating layer comprising a silanol condensation cured product of a silane crosslinkable composition)
When the innermost coating layer is a layer composed of a silanol condensation cured product of a silane crosslinkable composition, as a preferred production method, first, instead of the base resin or the resin composition, the above silane crosslinkable composition is replaced with an aluminum conductor. It is arranged on the outer periphery. Thereafter, the silane crosslinkable composition is crosslinked by contacting with water. The coating molding method is the same as that when a base resin or a resin composition is used.

The silane crosslinkable composition is a crosslinkable composition containing at least one of ethylene rubber and styrene elastomer and a silane graft resin, and is an ethylene rubber, styrene elastomer, silane graft resin, silanol condensation catalyst, preferably inorganic. A filler or the like can be prepared by melt mixing. In the case of ethylene rubber and styrene elastomer, the silane grafting reaction tends to proceed selectively (preferentially) with respect to the ethylene component-containing resin. Therefore, it is preferable to mix ethylene rubber and styrene elastomer after preparation of the silane graft resin as a means for avoiding cross-linking of ethylene rubber and styrene elastomer.
In this case, a rubber masterbatch containing at least one of ethylene rubber and styrene elastomer (referred to as ethylene rubber in the production method) as a masterbatch, silane MB containing a silane graft resin, and a condensation containing a silanol condensation catalyst. A method of kneading (melt mixing) the catalyst MB is preferable. In this method, a composite MB containing ethylene rubber or the like and a silanol condensation catalyst is preferably used as the rubber MB and the condensation catalyst MB from the viewpoint of productivity.
The inorganic filler may be contained in one or more of rubber MB, silane MB, condensation catalyst MB and composite MB, and is contained in silane MB in terms of the heat resistance of the resulting cured product layer and wiring material. It is preferable.

  In preparing the silane crosslinkable composition, the above-described base resin or resin composition kneading method can be appropriately employed as the melt mixing method and conditions for each component.

  The silane crosslinkable composition may be prepared using a commercially available or separately synthesized silane graft resin, or may be prepared through synthesis of a silane crosslinkable resin.

− Method for preparing a silane crosslinkable composition through synthesis of a silane crosslinkable resin −
Examples of a method for preparing a silane crosslinkable composition through synthesis of a silane crosslinkable resin include, for example, a silane MB preparation step (silane crosslinkable resin synthesis step), a rubber MB preparation, and a condensation catalyst MB preparation step as necessary. And a method having a melt-kneading step of silane MB, rubber MB and silanol condensation catalyst or condensation catalyst MB.

(A) Preparation process of silane MB The preparation process of silane MB includes, for example, a base resin containing at least an ethylene-based component-containing resin, an organic peroxide, an inorganic filler if necessary, and a silane coupling agent. A reaction composition containing a silane crosslinkable resin by melting and kneading at a temperature equal to or higher than the decomposition temperature of the peroxide and grafting the base resin and the silane coupling agent with radicals generated from the organic peroxide ( As the melt-kneaded product, a step of preparing silane MB can be mentioned.
As described above, this step is preferably melt-kneaded in the absence of ethylene rubber or the like. In the present invention, melt kneading in the absence of ethylene rubber or the like means melt kneading without substantially blending ethylene rubber or the like, and grafting of the silane coupling agent onto ethylene rubber or the like described above. As long as the chemical reaction can be suppressed within a range that does not impair the effects of the present invention, it may be present.

It is preferable to use an inorganic filler in the step of preparing the silane MB in that the obtained cured product layer, and thus the wiring material of the present invention exhibits high heat resistance.
In this method, the blending amount of each component is set to a blending amount that satisfies the above-described content as the entire silane crosslinkable composition. For example, the compounding quantity of an inorganic filler, a silane coupling agent, and a silanol condensation catalyst is as above-mentioned. The compounding amount of the organic peroxide is preferably 0.01 to 0.6 parts by mass and more preferably 0.05 to 0.3 parts by mass with respect to 100 parts by mass of the base resin used for preparing the silane crosslinkable composition. Preferably, 0.07-0.25 mass part is more preferable.

In the step of preparing silane MB, the mixing order of the components is not particularly limited, and may be mixed in any order. Although each component can be melt-kneaded at once, when using an inorganic filler, it is preferable to melt-knead said each component by the following process (a-1) and (a-2).
Step (a-1): Step for preparing a mixture by mixing at least an inorganic filler and a silane coupling agent Step (a-2): The mixture obtained in Step (a-1) and (Step for preparing Silane MB) A step of melt kneading the base resin in the presence of the organic peroxide at a temperature equal to or higher than the decomposition temperature of the organic peroxide.

  In the step (a-1), the method of mixing the inorganic filler and the silane coupling agent is not particularly limited, and dry mixing in which the silane coupling agent is mixed with the inorganic filler by heating or non-heating is preferable. By this process, an inorganic filler in which the silane coupling agent is bonded or adsorbed with a strong bond (via a silanol-condensable hydrolyzable silyl group) to the surface (site that can be chemically bonded) and a silane cup with a weak bond on the surface. An inorganic filler to which a ring agent is bonded or adsorbed can be prepared. Weak bonds include interactions due to hydrogen bonds, interactions between ions, partial charges or dipoles, and actions due to adsorption. Strong bonds include chemical bonds with the sites where inorganic fillers can be chemically bonded. Etc. Thereby, volatilization of a silane coupling agent can be reduced in a process (a-2) etc., and a highly heat-resistant hardened material and wiring material can be prepared or manufactured. The mixing conditions in the step (a-1) are not particularly limited, and examples include the above-described dry blending conditions.

Next, the mixture obtained in the step (a-1), the base resin, and the remaining components not mixed in the step (a-1) are decomposed in the presence of the organic peroxide. Melt and knead at a temperature higher than the temperature. Thereby, the grafting reaction site of the silane coupling agent and the site of the base resin capable of grafting reaction are caused to graft (bond) by radicals generated from the organic peroxide.
In the step (a) and the step (a-2), the temperature at which the above components are melted and kneaded is equal to or higher than the decomposition temperature of the organic peroxide, preferably the decomposition temperature of the organic peroxide + (25 to 110) ° C. For example, the temperature is 150 to 230 ° C. Other melt-kneading conditions such as mixing time can be set as appropriate. The kneading method is the same as the above-described kneading method and conditions for the base resin or resin composition.

The organic peroxide only needs to be present when the step (a-2) is performed, and may be mixed in the step (a-1) or may be mixed in the step (a-2). When the organic peroxide is mixed in step (a-1), the mixing temperature is kept below the decomposition temperature of the organic peroxide.
In the step (a-2), the silane coupling agent undergoes a grafting reaction at a site where grafting reaction of the ethylene-based component-containing resin is possible. At this time, the silane coupling agent bonded or adsorbed to the inorganic filler with a weak bond is desorbed from the inorganic filler and undergoes a grafting reaction. On the other hand, the silane coupling agent bonded or adsorbed to the inorganic filler with a strong bond undergoes a grafting reaction while maintaining the bond with the inorganic filler.

  In this way, a silane graft resin is synthesized by grafting reaction of the base resin and the silane coupling agent, and silane MB) containing the silane graft resin is prepared as a reaction composition.

(B-1) Preparation of Rubber MB In a method for preparing a silane crosslinkable composition through synthesis of a silane crosslinkable resin, rubber MB is prepared. The rubber MB may contain other components as long as it contains at least ethylene rubber or the like. The preparation of the rubber MB is not particularly limited as long as it is a method of kneading while melting ethylene rubber or the like, and for example, the melt mixing method and conditions in the kneading method of the base resin or the resin composition can be appropriately employed.

(B-2) Preparation Step of Condensation Catalyst MB In the method of preparing the silane crosslinkable composition through the synthesis of the silane crosslinkable resin, if necessary, the condensation catalyst MB is melt-mixed with the silanol condensation catalyst and the carrier resin. Prepare. The melt kneading of the carrier resin and the silanol condensation catalyst is not particularly limited as long as it is a method carried out while the carrier resin is melted, and the melt mixing method and conditions in the kneading method of the base resin or the resin composition can be appropriately employed.

(B-3) Preparation process of composite MB In the method of preparing a silane crosslinkable composition through the synthesis of a silane crosslinkable resin, in place of the rubber MB and the condensation catalyst MB, in terms of productivity, the condensation catalyst MB It is more preferable to prepare and use a composite MB using ethylene rubber or the like as a carrier resin. The preparation of the composite MB is not particularly limited as long as it is a method of kneading under melting of ethylene rubber, carrier resin, etc. For example, the melt mixing method and conditions in the kneading method of the base resin or the resin composition can be appropriately adopted.

(B-4) Melt-kneading step In the method for preparing a silane-crosslinkable composition through synthesis of a silane-crosslinkable resin, silane MB, rubber MB, and silanol condensation catalyst or condensation catalyst MB are then melt-kneaded. . For melt kneading, the melt mixing method and conditions in the kneading method of the base resin or the resin composition can be appropriately employed.

  In the method for producing a wiring material, other resins and additives that can be used in addition to the above components may be kneaded or mixed in any step, and the mixing order in each step is not particularly limited. The compounding amount of the additive is not particularly limited, and can be appropriately set within a range not impairing the intended effect. Although the compounding quantity of antioxidant can be set suitably, Preferably it is 0.1-15.0 mass parts with respect to 100 mass parts of resin compositions, More preferably, it is 0.1-10 mass parts.

  Thus, a silane crosslinkable composition can be prepared through synthesis of a silane crosslinkable resin.

(C) Arrangement step of silane crosslinkable composition In the method for producing a wiring material having an innermost coating layer made of a silanol condensation cured product of a silane crosslinkable composition, the silane crosslinkable composition is arranged on the outer periphery of the aluminum conductor. To do. The arrangement method of the silane crosslinkable composition is the same as in the case of using the base resin or the resin composition.

(D) Crosslinking step of silane crosslinkable composition Next, the silane crosslinkable composition coated around the aluminum conductor is brought into contact with water to crosslink. Thereby, the hydrolyzable silyl group of the silane coupling agent is hydrolyzed with water to become silanol (OH group bonded to a silicon atom), and the hydroxyl groups of the silanol are bonded to each other by the silanol condensation catalyst present in the silane crosslinkable composition. (Dehydration) condensation occurs to cause a crosslinking reaction (silanol condensation curing of the silane crosslinkable composition is formed). The method of crosslinking may be a method of leaving the silane crosslinkable composition formed by coating at room temperature, a method of leaving the silane crosslinkable composition formed by coating under humidification or warming, or a silane crosslinked composition formed by coating. The method of immersing a sex composition in warm water may be used.

Thus, the wiring material provided with the innermost coating layer which consists of silanol condensation hardened | cured material of a silane crosslinkable composition on the outer periphery of an aluminum conductor is manufactured.
The silanol condensation cured product of the silane crosslinkable composition includes a silane graft resin in which a silane coupling agent is graft-reacted with an ethylene-based component-containing resin, at least one of ethylene rubber and a styrene-based elastomer, and an inorganic filler in a preferred embodiment. The hydrolyzable group of the silane coupling agent bonded to the silane graft resin is hydrolyzed and then crosslinked by silanol condensation. This silane graft resin contains a crosslinked resin condensed through a silanol bond (siloxane bond). In the preferable aspect in which a silane crosslinkable composition contains an inorganic filler, the inorganic filler may be couple | bonded with the silane coupling agent of silane graft resin. In the silane crosslinkable composition and the silanol condensation cured product, the ethylene rubber and the styrene elastomer are not crosslinked with other resins.
Therefore, this hardened | cured material layer contains the crosslinked hardened | cured material of silane graft resin, at least one of ethylene rubber and a styrene-type elastomer, and an inorganic filler in a preferable aspect. The crosslinked cured product of the silane graft resin has a base resin component (an ethylene component-containing resin component, an ethylene rubber component, a styrene elastomer component), a silane coupling agent component, and in a preferred embodiment an inorganic filler component. is doing. The content of each component in the cured product layer varies depending on the reaction conditions, reaction rate, and the like, but is preferably within the range of the above blending amount. More specifically, in this cured product layer, the reaction sites of the silane coupling agent grafted on the silane graft resin are hydrolyzed and each other undergoes silanol condensation reaction, whereby the silane graft resins are crosslinked via the silane coupling agent. The silane cross-linked resin, at least one of ethylene rubber and styrene-based elastomer, preferably, the silane graft resin is bonded or adsorbed to the inorganic filler by the silane coupling agent, and is bonded via the inorganic filler and the silane coupling agent ( Cross-linked).

Specifically, the method for producing the wiring material of the present invention having the innermost coating layer made of the silanol condensation-cured product includes the following preparation step (A), preparation step (B), arrangement step (C) and It has a crosslinking step (D).
Preparation step (A): An organic peroxide, preferably an inorganic filler, and a silane coupling agent with respect to a base resin containing at least an ethylene-based component-containing resin, a temperature equal to or higher than the decomposition temperature of the organic peroxide. Preferably, the silane graft resin is obtained by melt-kneading in the absence of an ethylene rubber or the like and a silanol condensation catalyst and grafting the silane coupling agent to the base resin by radicals generated from the organic peroxide. Step preparation step (B) for preparing silane MB containing: Step arrangement step (C) for melt-kneading silane MB, ethylene rubber, etc., silanol condensation catalyst: Silane crosslinkable composition obtained in preparation step (B) Cross-linking step (D) for disposing the metal on the outer peripheral surface of the aluminum conductor: silane crosslinkable composition and water disposed on the outer peripheral surface of the aluminum conductor Contacting the

In the above method, in the preparation step (B), the aspect in which ethylene rubber or the like and the silanol condensation catalyst are melt-kneaded is not particularly limited. For example, it may be a step of melt-kneading silane MB, rubber MB containing at least ethylene rubber or the like, and condensation catalyst MB containing silanol condensation catalyst. Silane MB, ethylene rubber or the like and silanol condensation catalyst It may be a step of melt-kneading the contained composite MB.
Each process in the preferable manufacturing method which has the said process (A)-(D) is the above-mentioned process (a), process (b-1)-(b-4), process (c), and process, respectively. Corresponding to (d), the methods and conditions described in these steps can be applied as appropriate.
In addition, for each step in the preferred production method, and further in the reaction in the silane cross-linking method and the form of the condensed cured product obtained, for example, the description in JP-A-2017-145370 can be applied as appropriate. The contents are directly incorporated as part of the description of this specification.

EXAMPLES Hereinafter, although this invention is demonstrated in detail based on an Example, this invention is not limited to these.
In Tables 1 to 4, the numerical values related to the blending amounts in each example represent parts by mass unless otherwise specified. Moreover, the blank about each component means that the compounding quantity of a corresponding component is 0 mass part.

The detail of each component (compound) used for the Example and the comparative example is shown below.
<Base resin>
-Ethylene rubber-
Mitsui EPT0045H: Trade name, EPM, Mitsui Chemicals Nodel 3720P: Trade name, EPDM (ethylene-propylene-ethylidene norbornene rubber), Dow Chemical Company-Styrenic elastomer-
Septon 4077: trade name, SEEPS, Kuraray Tuftec (registered trademark) N504: hydrogenated SEBS (styrene / ethylene / butylene ratio = 32/68, manufactured by Asahi Kasei)
Septon 4033: Trade name, SEEPS, manufactured by Kuraray Co., Ltd.-Ethylene component-containing resin-
Evolue SP1540: trade name, LLDPE, manufactured by Prime Polymer)
Evolue SP0540: trade name, LLDPE, manufactured by Prime Polymer)
NUC7540: trade name, LLDPE, Nippon Unicar PB222A: trade name, polypropylene (ethylene-propylene random copolymer), Sun Allomer NUC6520: trade name, ethylene-ethyl acrylate copolymer resin, Nippon Unicar EV360: EVAFLEX EV360 (trade name), ethylene-vinyl acetate copolymer, Adtex L6100M manufactured by Mitsui DuPont Polychemical Co., Ltd .: trade name, maleic acid-modified polyethylene, manufactured by Nippon Polyethylene Co., Ltd.-Organic mineral oil-
Diana Process PW-90: trade name, paraffinic oil, manufactured by Idemitsu Kosan Co., Ltd. <Silane graft resin>
Linkron XF730T: trade name, silane graft LLDPE (vinyl methoxysilane grafted as silane coupling agent), manufactured by Mitsubishi Chemical Co., Ltd. <inorganic filler>
Aerosil 200: trade name, hydrophilic fumed silica, Kisuma 5L manufactured by Nippon Aerosil Co., Ltd .: trade name, surface treatment magnesium hydroxide of silane coupling agent, Softon 1200 manufactured by Kyowa Chemical Industry Co., Ltd .: trade name, calcium carbonate, Bihoku powdering industry GROMAX LL, manufactured by Co., Ltd .: trade name, carion clay (baked caryon), crystallite 5X, manufactured by Takehara Chemical Industry Co., Ltd .: trade name, crystalline silica, manufactured by Tatsumori Co., Ltd. <silane coupling agent>
KBM-1003: Trade name, vinyltrimethoxysilane, manufactured by Shin-Etsu Chemical Co., Ltd. <Organic peroxide>
Park Mill D: trade name, dicumyl peroxide, decomposition temperature 151 ° C., manufactured by NOF Corporation <Antioxidant>
Irganox 1010: trade name, pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], Irganox 1076 manufactured by BASF: trade name, octadecyl-3- (3,5 -Di-tert-butyl-4-hydroxyphenyl) propionate, manufactured by BASF <silanol condensation catalyst>
ADK STAB OT-1: trade name, dioctyltin dilaurate, manufactured by ADEKA <PVC blend>
SHV9877P: Trade name, PVC compound: Hardness 80A Riken Technos

<Preparation of master batch>
-Preparation of composite MB (resin composition) A-
Base resin (used as carrier resin in Examples 5 to 12), inorganic filler, antioxidant and silanol condensation catalyst in the Banbury mixer in the compounding amounts shown in the “Composite MB [A]” column of Tables 1 to 4. After being charged and melt-kneaded at 190 ° C., the material was discharged at a material discharge temperature of 200 ° C., and a pellet of composite MB [A] was obtained through a feeder ruder.
For Comparative Example 2, the pellets obtained by melting and kneading the base resin antioxidant at 170 ° C. and then discharging at a material discharge temperature of 180 ° C. and the organic peroxides in the blending amounts shown in Table 4 were used. The mixture was mixed using a roll gas mixture set at a roll temperature of 90 ° C. to obtain composite MB [A] pellets.
-Preparation of Silane MB [C]-
Blend the organic peroxide and the silane coupling agent at 25 ° C. in the blending amounts shown in the “Silane MB [C]” column of Table 1 and Table 2, then add the base resin and the antioxidant, and blender And stirred for 5 minutes (30 ° C.). The obtained mixture was added to a 65 mmφ single-screw kneader (ratio of effective screw length L to diameter D: L / D = 30) set to a cylinder temperature of 195 ° C. and a head temperature of 200 ° C. to obtain strands. This strand was cooled with water, and after draining water, a round pelletizer was passed through to obtain silane MB [C] pellets.
The silane grafting reaction was induced by melt kneading in the single-screw kneader. The silane MB [C] contains a silane crosslinkable resin obtained by grafting a silane coupling agent to an ethylene-based component-containing resin.
-Preparation of Silane MB [D]-
A mixture prepared by mixing an organic peroxide and a silane coupling agent at 25 ° C. at the blending amount shown in the column “Silane MB [D]” in Table 2 is added to the inorganic filler and stirred for 10 minutes with a Henschel mixer (30 ° C. ) To obtain an inorganic filler mixture. Next, the inorganic filler mixture obtained together with the base resin and the antioxidant component in the blending amount shown in the same column was added to the Banbury mixer, kneaded at 190 ° C. for 10 minutes, and discharged at 200 ° C. After the discharge, pellets of silane MB [D] were obtained by hot cut through a feeder ruder.
A silane grafting reaction was induced by melt kneading in the Banbury mixer. The silane MB [D] contains a silane crosslinkable resin obtained by grafting a silane coupling agent to an ethylene-based component-containing resin.

<Preparation of dry blend>
-Preparation of dry blend B-
Dry blending of the composite MB [A] pellets and the silane MB [B] pellets with the blending amounts shown in the “Composite MB [A]” and “Silane MB [B]” columns of Table 1 Product B was prepared.
-Preparation of dry blend C-
The compound MB [A] pellets and the silane MB [C] pellets were dry blended at the blending amounts shown in the “Composite MB [A]” column and the “Silane MB [C]” column in Tables 2 and 3. A dry blend B was prepared.
-Preparation of dry blend D-
Dry blending of the composite MB [A] pellets and the silane MB [D] pellets with the blending amounts shown in the “Composite MB [A]” and “Silane MB [D]” columns of Table 3 Product D was prepared.

<Manufacture of aluminum conductor wires>
-Examples 1, 4, 13-18, Comparative Examples 1, 5 and 6-
Aluminum conductor provided with a layer made of a non-crosslinked base resin composition as the innermost coating layer on the outer peripheral surface of the aluminum conductor, using the above composite MB [A] alone or using dry blend B (Example 4) An electric wire was manufactured.
The composite MB [A] pellets or dry blend B was introduced into an extruder (L / D = 24, compression section screw temperature 190 ° C., head temperature 200 ° C.) equipped with a screw having a diameter of 40 mm. In this extruder, composite MB [A] or dry blend B was melt-kneaded, and the outer peripheral surface of a 1 / 0.8 mm aluminum conductor as a conductor was directly extrusion coated (arranged) with a thickness of 1 mm to obtain an outer diameter. A thin coated conductor of 2.8 mm was obtained.
Separately, composite MB [A] pellets or dry blend B are introduced into an extruder (L / D = 28, compression part screw temperature 190 ° C., head temperature 200 ° C.) equipped with a screw having a diameter of 90 mm. did. While melting and kneading the composite MB [A] or the dry blend B in this extruder, the thickness is 1 on the outer peripheral surface of an aluminum stranded wire of 38SQ (19 / 1.6) (conductor diameter 7.3 mm) as a conductor. Directly extrusion coated (arranged) at 2 mm to obtain a thick coated conductor having an outer diameter of 9.7 mm.
In this way, two types of aluminum conductor wires (small-diameter insulated wires and large-diameter insulated wires) having a single-layer coating layer (innermost coating layer) were manufactured.
Also, the PVC blend was introduced into an extruder (L / D = 28, compression section screw temperature 180 ° C., head temperature 18 ° C.) equipped with a screw having a diameter of 90 mm, and the above insulated wire (thickness 9.7 mm) A PVC resin mixture was coated on the outside of the (diameter-coated conductor) to form a sheath layer having a thickness of 1.5 mm. Thus, a cable having a two-layer coating layer having an outer diameter of 12.7 mm was manufactured.

− Examples 2 and 3 and Comparative Examples 3 and 4 −
Using the dry blend B, an aluminum conductor electric wire having a silanol condensation-cured layer as an innermost coating layer on the outer peripheral surface of the aluminum conductor was produced.
In the production of the aluminum conductor wire of Example 1, the dry blend B was used in place of the composite MB [A] pellets, and the two coated conductors obtained were each at a temperature of 60 ° C. and a relative humidity of 95%. Two types of aluminum conductor wires having a single-layer coating layer were produced in the same manner as in the production of the aluminum conductor wires in Example 1, except that the aluminum conductor wires were left in the atmosphere for 24 hours and contacted with water. In this example, the trimethoxy group of the silane coupling agent was hydrolyzed by contacting the coated conductor with water, and then silanol-condensed to cause silane crosslinking.
Further, a cable having an outer diameter of 12.7 mm was manufactured in the same manner as the manufacture of the cable of Example 1.

-Examples 5 to 9-
Using the dry blend C, an aluminum conductor electric wire having a silanol condensation cured product layer as an innermost coating layer on the outer peripheral surface of the aluminum conductor was produced.
In the production of the aluminum conductor wire of Example 1, the dry blend C was used in place of the composite MB [A] pellets, and the two types of coated conductors obtained were each at a temperature of 60 ° C. and a relative humidity of 95%. Two types of aluminum conductor wires having a single-layer coating layer were produced in the same manner as in the production of the aluminum conductor wires in Example 1, except that the aluminum conductor wires were left in the atmosphere for 24 hours and contacted with water. In this example, the trimethoxy group of the silane coupling agent is subjected to a hydrolysis reaction and then a silanol condensation reaction by bringing a coated conductor (a melt-kneaded product of dry blend C, extruded on the outer peripheral surface of an aluminum conductor) into contact with water. The silane was cross-linked.
Further, a cable having an outer diameter of 12.7 mm was manufactured in the same manner as the manufacture of the cable of Example 1.

-Examples 10-12-
Using the dry blend D, an aluminum conductor electric wire having a silanol condensation cured product layer as an innermost coating layer on the outer peripheral surface of the aluminum conductor was produced.
In the production of the aluminum conductor wire of Example 1, the dry blend product D was used in place of the composite MB [A] pellets, and the two coated conductors obtained were each at a temperature of 60 ° C. and a relative humidity of 95%. Two types of aluminum conductor wires having a single-layer coating layer were produced in the same manner as in the production of the aluminum conductor wires in Example 1, except that the aluminum conductor wires were left in the atmosphere for 24 hours and contacted with water. In this example, the trimethoxy group of the silane coupling agent is subjected to a hydrolysis reaction and then a silanol condensation reaction by bringing a coated conductor (a melt-kneaded product of a dry blend D, extruded on the outer peripheral surface of an aluminum conductor) into contact with water. The silane was cross-linked.
Further, a cable having an outer diameter of 12.7 mm was manufactured in the same manner as the manufacture of the cable of Example 1.

− Comparative Example 2 −
Using the above composite MB [A] pellets alone, an aluminum conductor electric wire having a layer made of a crosslinked base resin composition as the innermost coating layer on the outer peripheral surface of the aluminum conductor was produced.
The pellets of the composite MB [A] were introduced into an extruder (L / D = 22, compression section screw temperature 120 ° C., head temperature 125 ° C.) equipped with a screw having a diameter of 65 mm. With this extruder, the composite MB [A] was directly extruded (arranged) on the outer peripheral surface of a 1 / 0.8 mm aluminum conductor as a conductor with a thickness of 1 mm, and then a water vapor crosslinked tube set at 200 ° C. and 4.5 atm. A thin coated conductor having an outer diameter of 2.8 mm was obtained.
Separately, the composite MB [A] pellets were introduced into an extruder (L / D = 24, compression section screw temperature 110 ° C., head temperature 120 ° C.) equipped with a screw having a diameter of 115 mm. With this extruder, the composite MB [A] was directly extruded (arranged) with a thickness of 1.2 mm on the outer peripheral surface of a 38SQ (19 / 1.6) (conductor diameter: 7.3 mm) aluminum stranded conductor as a conductor, A large-diameter coated conductor having an outer diameter of 9.7 mm was obtained through a steam bridge tube set at 200 ° C. and 3.5 atm.

The following evaluation was performed on the manufactured insulated wires and cables, and the results are shown in Tables 1 to 4.
<Workability test>
(Cutting test of insulated wire)
The peelability of the insulated wire was evaluated by a cutting property test based on the following tests.
-1. Test for confirming presence of beard −
A thin insulated wire using a 1 / 0.8 mm aluminum conductor manufactured in each Example and Comparative Example was processed with a wire stripper, and the presence or absence of whiskers was confirmed. A beard refers to a linear body (hairy body) of an insulating coating layer that cannot be cut in the thickness direction and remains on the cut end surface (extends from the cut end surface).
The hole diameter of the stripper was 0.8 mm, and the stripping length of the coating layer was 15 mm. This process was tested four times for each thin insulated wire.
The evaluation was “A” when the length of the beard generated in the cut part in all four tests was 4 mm or less, and the length of the beard generated in the cut part in all four tests exceeded 4 mm and 8 mm. The case where it was below was designated as “B”, and the case where the length of the whisker that occurred even once in the cut portion exceeded 8 mm was designated as “C”. In this test, the evaluation ranks “A” and “B” are acceptable.

-2. Residual test for cutting residue-
A large-diameter insulated wire using a 38SQ aluminum stranded wire produced in each Example and Comparative Example was processed with a wire stripper, and the cut residue of the insulating coating layer remaining on the surface and inside of the aluminum stranded wire was confirmed.
The hole diameter of the stripper was 9.0 mm, and the stripping length of the coating layer was 15 mm. This process was tested four times for each large diameter insulated wire.
Evaluation is “A” when the remaining cutting residue is not confirmed on the cut aluminum strand in all four tests, and when the remaining cutting residue is confirmed on the cut aluminum strand even once. “B” was defined as “C” when the remaining cut residue was confirmed on the aluminum stranded wire in the cut portion in two or more tests. In this test, the evaluation ranks “A” and “B” are acceptable.

<Flexibility test of insulated wires>
When the large-diameter insulated wires using 38SQ aluminum stranded wires manufactured in each of the examples and comparative examples were bent into a U-shape and 4D (D represents the radius of the large-diameter insulated wires) (U-shaped curve) The inner diameter of the part was 4 times the radius of the thick insulated wire), and the force required for bending was measured with Tensilon.
Tables 1 to 4 show the measured values of the force required for bending. In this test, the case where the force required for bending is 50 N or less is “pass”, and the case where the force exceeds 50 N is rejected.

<Cable flexibility test>
When the cable having an outer diameter of 12.7 mm manufactured in each of the examples and comparative examples was bent into a U shape and 4D (D represents the radius of the cable) (the diameter of the U-shaped bend is the radius of the cable) 4 times), the force required for bending was measured with Tensilon.
Tables 1 to 4 show the measured values of the force required for bending. In this test, the case where the force required for bending is 65 N or less is “pass”, and the case where the force exceeds 65 N is rejected. When this force is 50 N or less, the flexibility is very good.

<Heat wrap test>
The heat resistance of the insulated wire was evaluated by the following heating winding test.
Specifically, a test sample prepared by winding a thin insulated wire using a 1 / 0.8 mm aluminum conductor manufactured in each example and comparative example around a mandrel having the same outer diameter (diameter) as that of the self-diameter (diameter) for 6 turns. Was made. This test sample was left in a constant temperature bath at 120 ° C. for 24 hours. After leaving, the test sample was returned to room temperature, the thin insulated wire was unwound from the test sample, and the surface was confirmed.
Evaluation is "A" when the thin insulated wire is not melted over the whole, the thin insulated wire is melted and fused with the adjacent thin insulated wire (turn parts), but the aluminum conductor "B" was not seen, and "C" was the case where the aluminum conductor was exposed due to melting of the thin insulated wire. This test is a reference test. When the evaluation rank is “A” and “B”, the heat resistance is high, and the heat resistance equal to or higher than the heat resistance of the thin insulated wire manufactured in the same manner except that a copper conductor is used is shown. In addition, it confirmed that the normal heat resistance requested | required of an insulated wire was satisfy | filled about the thing with an evaluation rank "C" among the insulated wires of an Example.

From the results of Tables 1 to 4, the following can be understood.
The wiring materials of the comparative examples that do not use the aluminum conductor and the innermost coating layer made of the base resin containing at least one of ethylene rubber and styrene elastomer are inferior to the cutting test and the flexibility test of the insulated wire. It does not have peelability and flexibility.
That is, Comparative Example 1 is a wiring material having an innermost coating layer made of a non-crosslinked base resin composition (containing no ethylene rubber and no styrene elastomer), and has poor peelability (whiskering) and flexibility. It does not show sufficient heat resistance. Comparative Example 2 is a wiring material having an innermost coating layer (containing no ethylene rubber and styrene-based elastomer) in which base resins are not self-crosslinked with an organic peroxide instead of silane crosslinking, and processability (whisker generation) is also Flexibility is also poor. Comparative Examples 3 and 4 are wiring materials having an innermost coating layer formed by using a silane crosslinkable composition B containing no base resin and no inorganic filler containing neither ethylene rubber nor styrene elastomer, Although sufficient heat resistance is exhibited, workability (whisker generation) and flexibility are inferior. Comparative Example 5 is a wiring material having an innermost coating layer formed using a non-crosslinked base resin composition containing a small amount of an inorganic filler and a base resin containing neither ethylene rubber nor styrenic elastomer, and peelability (The generation of whiskers cannot be suppressed, and cutting residue remains remarkably) and the flexibility is inferior, and the heat resistance is not sufficient. Comparative Example 6 is a wiring material having an innermost coating layer formed using a base resin composition containing neither ethylene rubber nor styrene-based elastomer, and has a low flexibility and a processable ethylene-based component-containing resin ( It is inferior in beard generation) and flexibility, and heat resistance is not sufficient.

  On the other hand, the wiring materials of Examples 1 to 18 arranged in direct contact with the combination of the aluminum conductor and the innermost coating layer made of a base resin containing at least one of ethylene rubber and styrene elastomer, Both have passed the cutting property test and the flexibility test of the insulated wire, and it can be seen that they have both excellent peelability and flexibility. Furthermore, Examples 2 and 35 to 12 each having an innermost coating layer obtained by silane-crosslinking an ethylene-based component-containing resin subjected to a silane grafting reaction, without impairing excellent peelability and flexibility, It can be seen that it also has high heat resistance. In particular, Examples 10 to 12 show higher heat resistance because the silane coupling agent used for silane crosslinking is bonded or adsorbed to the inorganic filler and then the silane grafting reaction is performed on the ethylene-based component-containing resin.

Claims (7)

A wiring material having at least one insulating coating layer on the outer periphery of an aluminum conductor,
The wiring member in which the innermost insulating coating layer provided directly on the outer periphery of the aluminum conductor in the insulating coating layer is a base resin layer containing at least one of ethylene rubber and styrene-based elastomer.   The wiring material according to claim 1, wherein the base resin contains at least one resin selected from the group consisting of an ethylene-α-olefin copolymer, polyethylene, and polypropylene.   The wiring material according to claim 2, wherein the at least one resin is a crosslinked resin. The wiring material according to claim 1, wherein the base resin layer is a silanol condensation cured product of the following silane crosslinkable composition.
<Silane crosslinkable composition>
At least one of ethylene rubber and styrene-based elastomer, and at least one silane graft resin selected from the group consisting of ethylene-α-olefin copolymer resin, polyethylene, and polypropylene, in which a silane coupling agent is graft-bonded; Silane crosslinkable composition containing silanol condensation catalyst   The wiring material according to any one of claims 1 to 4, wherein a total content of the ethylene rubber and the styrene-based elastomer in the base resin is at least 5% by mass.   The wiring material according to claim 1, wherein the base resin contains an organic mineral oil.   The wiring material according to claim 1, wherein the insulating coating layer is two or more layers, and the outermost insulating coating layer is a polyvinyl chloride insulating coating layer.