JP5846359B2 - Insulated wires and cables - Google Patents
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- JP5846359B2 JP5846359B2 JP2011182892A JP2011182892A JP5846359B2 JP 5846359 B2 JP5846359 B2 JP 5846359B2 JP 2011182892 A JP2011182892 A JP 2011182892A JP 2011182892 A JP2011182892 A JP 2011182892A JP 5846359 B2 JP5846359 B2 JP 5846359B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/82—Recycling of waste of electrical or electronic equipment [WEEE]
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Description
本発明は、絶縁電線及びケーブルに関するものであり、更に詳しくはゲル分率４０％以下の再生材を利用して得られる絶縁電線及びケーブルに関するものである。 The present invention relates to an insulated wire and cable, and more particularly to an insulated wire and cable obtained by using a recycled material having a gel fraction of 40% or less.
導体の外周を絶縁材料で被覆して絶縁電線が製造される。この絶縁電線を線心とし、これをシースで被覆してなるケーブル、この絶縁電線を線心とし、これを複数束ねた後にシースで被覆してなるケーブルが提供される。さらに、これら絶縁電線や単線の電力ケーブルを複数束ねた複線のケーブルがある。本願発明において「絶縁電線」という用語は、線心を含む意味で用いる。
絶縁電線又はケーブルの被覆材には、ポリ塩化ビニルやポリエチレン、架橋ポリエチレンが使用されている。使用後、回収された電線又はケーブルは導体と被覆材に分離され、被覆材は廃材としてリサイクルされ、又は埋立処理される。
被覆廃材の中でもポリ塩化ビニルやポリエチレンを主成分とする廃材は、熱可塑性であり、再成形加工が容易であることから、再び電線被覆材としてリサイクルすることが容易であった。
An insulated wire is manufactured by covering the outer periphery of the conductor with an insulating material. There are provided a cable in which this insulated wire is used as a wire core and this is covered with a sheath, and a cable in which this insulated wire is used as a wire core and a plurality of these wires are bundled and then covered with a sheath. Furthermore, there are double-wire cables in which a plurality of these insulated wires and single-wire power cables are bundled. In the present invention, the term “insulated wire” is used to include a wire core.
Polyvinyl chloride, polyethylene, and cross-linked polyethylene are used as a covering material for insulated wires or cables. After use, the collected electric wire or cable is separated into a conductor and a covering material, and the covering material is recycled as a waste material or is landfilled.
Among the covering waste materials, the waste materials mainly composed of polyvinyl chloride and polyethylene are thermoplastic and can be easily re-formed, so that they can be easily recycled as the wire covering materials.
一方、架橋ポリエチレンを主成分とする被覆廃材は、架橋による３次元構造を有しているため加熱溶融できず、リサイクルすることが難しいが、近時、所定の手段で架橋ポリエチレンの架橋を切断することにより、当該樹脂を熱可塑化可能にし、リサイクル可能な再生材を得る技術が開発された（特許文献１参照）。そして、この再生材を混合したポリオレフィン系樹脂組成物を用いて絶縁電線の絶縁層を形成することも報告されている（特許文献２参照）。
しかしながら、上記の特許文献２に記載の技術では、ポリオレフィン系樹脂組成物に配合できる再生材の量は５０質量％が上限であり、これを超える再生材を配合したものであると、絶縁層に要求される特性を満足することが出来ないとされている。
On the other hand, the coated waste material mainly composed of crosslinked polyethylene cannot be heated and melted because it has a three-dimensional structure by crosslinking, and is difficult to recycle. However, recently, the crosslinked polyethylene is cut by a predetermined means. As a result, a technique for making the resin thermoplastic and obtaining a recyclable recycled material has been developed (see Patent Document 1). And forming the insulating layer of an insulated wire using the polyolefin-type resin composition which mixed this recycled material is also reported (refer patent document 2).
However, in the technique described in
特許文献３には、ゲル分率を１０％以下に調整した再生材を５０質量％を超えて含有する樹脂組成物を用いて絶縁被覆層を形成することが記載されている。しかし、特許文献３の技術では、使用する再生材をゲル分率１０％以下にまで加工しなければならず、再生コストが増大する。また、特許文献３の技術は、絶縁被覆層を形成する樹脂組成物を過酸化物架橋方式により架橋させるものであり、シラン架橋方式や放射線架橋方式等の架橋方式にまでは適用できない。 Patent Document 3 describes that an insulating coating layer is formed using a resin composition containing a recycled material having a gel fraction adjusted to 10% or less in excess of 50% by mass. However, in the technique of Patent Document 3, the recycled material to be used must be processed to a gel fraction of 10% or less, which increases the regeneration cost. Moreover, the technique of patent document 3 bridge | crosslinks the resin composition which forms an insulation coating layer by a peroxide bridge | crosslinking system, and cannot be applied to bridge | crosslinking systems, such as a silane crosslinking system and a radiation crosslinking system.
より多くの被覆廃材を電線被覆材としてリサイクルできれば、環境負荷や経済的負荷をより低減させることができる。
本発明は、架橋ポリオレフィン単独重合体や、構成成分にオレフィン成分を含む架橋共重合体（以下、架橋オレフィン共重合体という。）を含む廃材由来の再生材を、より大きな割合で用いうる絶縁電線及びケーブルの提供を課題とする。
また、本発明は、前記再生材を含有し、前記再生材を絶縁電線及びケーブルの被覆層により多く用いるのに好適な樹脂組成物の提供を課題とする。
If more coating waste material can be recycled as the wire coating material, the environmental load and the economic load can be further reduced.
The present invention relates to an insulated electric wire that can use a recycled material derived from a waste material containing a crosslinked polyolefin homopolymer or a crosslinked copolymer containing an olefin component as a constituent component (hereinafter referred to as a crosslinked olefin copolymer) in a larger proportion. And the provision of cables.
Moreover, this invention makes it a subject to provide the resin composition suitable for using the said recycled material more and using the said recycled material more for the coating layer of an insulated wire and a cable.
本発明者らは、上記課題について鋭意検討を行った結果、架橋ポリオレフィン単独重合体及び架橋オレフィン共重合体の少なくともいずれか一方を含む廃材を適宜に再生処理して得た特定のオレフィン系再生材と、特定の性状を示すポリエチレンとを含む再生材混合樹脂組成物を絶縁被覆層に用いると、当該再生材混合樹脂組成物がゲル分率の高い再生材を高濃度に含有する場合であっても、被覆層の伸びが十分な電線及びケーブルが得られることを見出した。
本発明は、これらの知見に基づき完成させるに至ったものである。
As a result of earnest studies on the above problems, the present inventors have obtained a specific olefin-based recycled material obtained by appropriately recycling a waste material containing at least one of a crosslinked polyolefin homopolymer and a crosslinked olefin copolymer. And a recycled material mixed resin composition containing polyethylene having specific properties for the insulating coating layer, the recycled material mixed resin composition contains a recycled material having a high gel fraction at a high concentration. In addition, it was found that an electric wire and a cable with sufficient elongation of the coating layer can be obtained.
The present invention has been completed based on these findings.
本発明の課題は下記の手段により達成された。
＜１＞被覆層の少なくとも１層を、架橋ポリオレフィン単独重合体及び／又は架橋オレフィン共重合体を含む廃材由来のゲル分率４０％以下の再生材と、下記（Ａ）及び（Ｂ）の性状を満たす直鎖状低密度ポリエチレンとを含み、該再生材及び該直鎖状低密度ポリエチレンの総含有量に占める該再生材の割合が５０質量％を超え７５質量％以下である再生材混合樹脂組成物で形成した絶縁電線：
（Ａ）重量平均分子量Ｍｗと数平均分子量Ｍｎの比の値（Ｍｗ／Ｍｎ）が１３以上、
（Ｂ）融点が１２０℃以上。
＜２＞導体が絶縁層で被覆された絶縁電線の絶縁層を、架橋ポリオレフィン単独重合体及び／又は架橋オレフィン共重合体を含む廃材由来のゲル分率４０％以下の再生材と、下記（Ａ）及び（Ｂ）の性状を満たす直鎖状低密度ポリエチレンとを含み、該再生材及び該直鎖状低密度ポリエチレンの総含有量に占める該再生材の割合が５０質量％を超え７５質量％以下である再生材混合樹脂組成物で形成した絶縁電線：
（Ａ）重量平均分子量Ｍｗと数平均分子量Ｍｎの比の値（Ｍｗ／Ｍｎ）が１３以上、
（Ｂ）融点が１２０℃以上。
＜３＞＜１＞又は＜２＞に記載の絶縁電線を絶縁線心として用いたケーブル。
＜４＞架橋ポリオレフィン単独重合体及び／又は架橋オレフィン共重合体を含む廃材由来のゲル分率４０％以下の再生材と、下記（Ａ）及び（Ｂ）の性状を満たす直鎖状低密度ポリエチレンとを含み、該再生材及び該直鎖状低密度ポリエチレンの総含有量に占める該再生材の割合が５０質量％を超え７５質量％以下である再生材混合樹脂組成物：
（Ａ）重量平均分子量Ｍｗと数平均分子量Ｍｎの比の値（Ｍｗ／Ｍｎ）が１３以上、
（Ｂ）融点が１２０℃以上。
The object of the present invention has been achieved by the following means.
<1> At least one of the coating layers is a recycled material having a gel fraction of 40% or less derived from a waste material containing a crosslinked polyolefin homopolymer and / or a crosslinked olefin copolymer, and the following properties (A) and (B): And a ratio of the recycled material to the total content of the recycled material and the linear low density polyethylene is more than 50% by mass and 75 % by mass or less. Insulated wires formed from the composition:
(A) The value (Mw / Mn) of the ratio of the weight average molecular weight Mw to the number average molecular weight Mn is 13 or more,
(B) Melting | fusing point is 120 degreeC or more.
<2> An insulating layer of an insulated wire whose conductor is covered with an insulating layer, a recycled material having a gel fraction of 40% or less derived from a waste material containing a crosslinked polyolefin homopolymer and / or a crosslinked olefin copolymer, and the following (A ) And (B) satisfying the properties of linear low density polyethylene, and the ratio of the recycled material to the total content of the recycled material and linear linear low density polyethylene exceeds 50 mass% and is 75 mass%. Insulated wires formed from the following recycled material mixed resin composition:
(A) The value (Mw / Mn) of the ratio of the weight average molecular weight Mw to the number average molecular weight Mn is 13 or more,
(B) Melting | fusing point is 120 degreeC or more.
<3 > A cable using the insulated wire according to < 1> or <2 > as an insulated core.
< 4 > Recycled material having a gel fraction of 40% or less derived from waste material containing a crosslinked polyolefin homopolymer and / or a crosslinked olefin copolymer, and linear low density polyethylene satisfying the following properties (A) and (B) A recycled material mixed resin composition in which the ratio of the recycled material to the total content of the recycled material and the linear low-density polyethylene is more than 50% by mass and 75 % by mass or less:
(A) The value (Mw / Mn) of the ratio of the weight average molecular weight Mw to the number average molecular weight Mn is 13 or more,
(B) Melting | fusing point is 120 degreeC or more .
本発明の絶縁電線及びケーブルは、被覆層の少なくとも１層に、架橋ポリオレフィン単独重合体及び／又は架橋オレフィン共重合体を含む廃材を適宜に処理した再生材をより多く用いることができ、環境負荷及び経済的負荷がより少ない。
また、本発明の再生材混合樹脂組成物は前記再生材を含有し、絶縁電線及びケーブルの被覆層に用いた場合に、被覆層中の再生材の含有率をより高めることができる。
The insulated electric wire and cable of the present invention can use more recycled materials appropriately treated with a waste material containing a crosslinked polyolefin homopolymer and / or a crosslinked olefin copolymer in at least one layer of the coating layer. And less economic burden.
In addition, the recycled material mixed resin composition of the present invention contains the recycled material, and when used for a coating layer of an insulated wire and a cable, the content of the recycled material in the coating layer can be further increased.
以下、本発明について、その好ましい実施態様に基づき詳細に説明する。 Hereinafter, the present invention will be described in detail based on preferred embodiments thereof.
本発明の絶縁電線及びケーブルは、絶縁電線の被覆層の少なくとも１層が、架橋ポリオレフィン単独重合体及び架橋オレフィン共重合体のいずれか一方又は双方を含む廃材に由来するゲル分率４０％以下の再生材と、特定の性状の直鎖状低密度ポリエチレンとを特定の混合比で含む再生材混合樹脂組成物を用いて形成されたものである。
本発明の絶縁電線は、好ましくは、導体が絶縁層で被覆されており、当該絶縁層が、前記再生材混合樹脂組成物を用いて形成されたものである。
本発明のケーブルは、線心として前記絶縁電線を含み、これにシースを施したものである。
The insulated wire and cable of the present invention have a gel fraction of 40% or less derived from a waste material in which at least one of the covering layers of the insulated wire contains one or both of a crosslinked polyolefin homopolymer and a crosslinked olefin copolymer. It is formed using a recycled material mixed resin composition containing a recycled material and a linear low density polyethylene having a specific property at a specific mixing ratio.
In the insulated wire of the present invention, the conductor is preferably covered with an insulating layer, and the insulating layer is formed using the recycled material mixed resin composition.
The cable of the present invention includes the insulated wire as a core, and a sheath is provided on the insulated wire.
本発明において、再生材とは、架橋ポリオレフィン単独重合体及び／又は架橋オレフィン共重合体を含む廃材を、架橋を切断することにより熱可塑化できるように再生処理（以下、「脱架橋」ということがある。）したものであることが好ましい。 In the present invention, the regenerated material is a recycle treatment (hereinafter referred to as “decrosslinking”) so that a waste material containing a crosslinked polyolefin homopolymer and / or a crosslinked olefin copolymer can be thermoplasticized by cutting the crosslink. Preferably).
本発明において、前記ポリオレフィン単独重合体とは、１種類のオレフィンの重合体をいう。前記架橋ポリオレフィン単独重合体とは、前記ポリオレフィン単独重合体が架橋されたものである。前記ポリオレフィン単独重合体として、例えば、低密度ポリエチレン（ＬＤＰＥ）、直鎖状低密度ポリエチレン（Ｌ−ＬＤＰＥ）、直鎖状超低密度ポリエチレン（ＶＬＤＰＥ）、高密度ポリエチレン（ＨＤＰＥ）、分岐状低密度ポリエチレン、ポリプロピレン等を挙げることができる。 In the present invention, the polyolefin homopolymer refers to a polymer of one kind of olefin. The said crosslinked polyolefin homopolymer is what the said polyolefin homopolymer was bridge | crosslinked. Examples of the polyolefin homopolymer include, for example, low density polyethylene (LDPE), linear low density polyethylene (L-LDPE), linear very low density polyethylene (VLDPE), high density polyethylene (HDPE), and branched low density. Examples thereof include polyethylene and polypropylene.
また、前記オレフィン共重合体とは、あるオレフィンと、それと異なるオレフィンの共重合体、及び、オレフィンと、オレフィン以外の炭素−炭素二重結合を有する化合物、例えばビニル化合物との共重合体などオレフィン成分を構成成分とするものを含む、広義の意味で用いる。前記架橋オレフィン共重合体とは、前記オレフィン共重合体が架橋されたものをいう。
前記オレフィン共重合体として、例えば、エチレン−プロピレンゴム（ＥＰＲ）、エチレン−プロピレン−ジエン三元重合体（ＥＰＤＭ）、エチレン−酢酸ビニル共重合体（ＥＶＡ）、エチレン−（メタ）アクリル酸エステル共重合体（例えば、エチレン−エチルアクリレート共重合体等）、エチレン−（メタ）アクリル酸共重合体、アクリルニトリル−ブタジエン共重合体（ＮＢＲ）等を挙げることができる。
The olefin copolymer is a copolymer of a certain olefin and a different olefin, and a compound having a carbon-carbon double bond other than olefin and olefin, such as a copolymer of vinyl compound. It is used in a broad sense, including those whose components are constituents. The said crosslinked olefin copolymer means what the said olefin copolymer was bridge | crosslinked.
Examples of the olefin copolymer include ethylene-propylene rubber (EPR), ethylene-propylene-diene terpolymer (EPDM), ethylene-vinyl acetate copolymer (EVA), and ethylene- (meth) acrylic acid ester copolymer. Examples thereof include polymers (for example, ethylene-ethyl acrylate copolymer), ethylene- (meth) acrylic acid copolymers, acrylonitrile-butadiene copolymers (NBR), and the like.
前記廃材は、異種の架橋ポリオレフィン単独重合体を１種又は２種以上含有してもよいし、異種の架橋オレフィン共重合体を１種又は２種以上含有してもよい。
また、廃材として用いる前記の架橋体は、前記ポリオレフィン単独重合体と前記オレフィン共重合体とを混合物として架橋されたものでもよい。
上記廃材は、上記架橋ポリオレフィン単独重合体や架橋オレフィン共重合体に加えて、ナイロン６、ナイロン６６、ポリエチレンテレフタレート（ＰＥＴ）等のそれ自体オレフィン成分を構成成分としない廃材を、本発明の目的を損なわない範囲で含んでいてもよい。
なお、上記（メタ）アクリル酸とは、アクリル酸及び／又はメタクリル酸を意味する。
The waste material may contain one kind or two or more kinds of different kinds of crosslinked polyolefin homopolymers, or may contain one kind or two or more kinds of different kinds of crosslinked olefin copolymers.
The crosslinked product used as a waste material may be a crosslinked product of the polyolefin homopolymer and the olefin copolymer.
In addition to the above-mentioned crosslinked polyolefin homopolymer and crosslinked olefin copolymer, the above-mentioned waste material is a waste material that does not itself contain olefin components such as nylon 6, nylon 66, polyethylene terephthalate (PET), etc. You may include in the range which does not impair.
The (meth) acrylic acid means acrylic acid and / or methacrylic acid.
前記架橋ポリオレフィン単独重合体及び架橋オレフィン共重合体はどのような方法で架橋されたものでもよく、例えば、それ自体周知である、有機過酸化物やシラン化合物、電子線照射などによって架橋されたものを使用することができる。
再生処理に供される架橋ポリオレフィン単独重合体及び／又は架橋オレフィン共重合体を含む廃材は、架橋ポリオレフィン単独重合体及び架橋オレフィン共重合体の少なくともいずれかを含んでいれば特に制限はないが、架橋ポリオレフィン単独重合体及び架橋オレフィン共重合体の少なくともいずれかを主成分として含有することが好ましい。より具体的には、廃材中の架橋ポリオレフィン単独重合体及び架橋オレフィン共重合体の総含有量が５０質量％以上であることが好ましく、７０質量％以上であることがより好ましく、８０質量％以上であることがさらに好ましく、９０質量％以上であることが特に好ましく、９５〜１００質量％であることがとりわけ好ましい。
The cross-linked polyolefin homopolymer and cross-linked olefin copolymer may be cross-linked by any method, for example, cross-linked by organic peroxides, silane compounds, electron beam irradiation, etc., which are well known per se. Can be used.
The waste material containing the crosslinked polyolefin homopolymer and / or the crosslinked olefin copolymer subjected to the regeneration treatment is not particularly limited as long as it contains at least one of the crosslinked polyolefin homopolymer and the crosslinked olefin copolymer, It is preferable to contain at least one of a crosslinked polyolefin homopolymer and a crosslinked olefin copolymer as a main component. More specifically, the total content of the crosslinked polyolefin homopolymer and the crosslinked olefin copolymer in the waste material is preferably 50% by mass or more, more preferably 70% by mass or more, and 80% by mass or more. More preferably, it is 90 mass% or more, and it is especially preferable that it is 95-100 mass%.
前記廃材の発生源は特に制限はない。例えば、電線被覆廃材、光ケーブル被覆廃材などの配線材の被覆廃材、一般廃棄物として廃棄される給水用、給湯用、屋内暖房用のパイプ、各種発泡体などが挙げられる。本発明に用いる廃材の劣化度合いに制限はなく、劣化の少ないものから劣化の激しいものまで用いることができる。
本発明に用いる廃材は、電線やケーブルにおける被覆層（被覆廃材）であることが好ましく、架橋ポリエチレンを含有する被覆廃材であることが好ましい。また、当該架橋ポリエチレンは、有機過酸化物、シラン、電子線照射などで架橋されていることが好ましい。
The generation source of the waste material is not particularly limited. For example, a covering waste material of a wiring material such as an electric wire covering waste material and an optical cable covering waste material, a pipe for water supply, hot water supply, indoor heating, etc., discarded as general waste, and various foams. There is no restriction on the degree of deterioration of the waste material used in the present invention, and it can be used from those having little deterioration to those having severe deterioration.
The waste material used in the present invention is preferably a coating layer (coating waste material) in an electric wire or cable, and is preferably a coating waste material containing a crosslinked polyethylene. The crosslinked polyethylene is preferably crosslinked by organic peroxide, silane, electron beam irradiation or the like.
本発明に用いる再生材は、架橋ポリオレフィン単独重合体及び／又は架橋オレフィン共重合体を含む廃材を再生処理してゲル分率４０％以下にすることにより得られる。
再生材の架橋度は、一般に、ゲル分率で示される。前記再生処理の程度は、このゲル分率を目安に調節することができる。廃材の再生処理を高度に行うと、得られる再生材のゲル分率は小さくなる。
本発明において、再生材のゲル分率は、加温したキシレンに再生材を溶解した際に、溶解せずに残った再生材の質量を、溶解前の再生材の質量に対する割合（％）で表したものであり、ＪＩＳ Ｃ ３００５中の「４．２５架橋度」に従って測定したものである。
前記再生処理の程度が低く、再生材のゲル分率が４０％を超えると、電線被覆材としての特性、特に、絶縁層に要求される機械的特性、電気的特性に劣る可能性がある。再生材のゲル分率は３５％以下であることが好ましく、５〜３０％とすることがより好ましい。ゲル分率を５％未満にまで下げるべく再生処理を過剰に行うと、メルトフローレート（ＭＦＲ）が大きくなりすぎて電線やケーブル製造時の加工性が低下するおそれがある。再生材のゲル分率は１０％を超えることがより好ましい。
The recycled material used in the present invention can be obtained by regenerating a waste material containing a crosslinked polyolefin homopolymer and / or a crosslinked olefin copolymer to a gel fraction of 40% or less.
The degree of cross-linking of the recycled material is generally indicated by a gel fraction. The degree of the regeneration treatment can be adjusted using the gel fraction as a guide. When waste material is highly recycled, the resulting recycled material has a reduced gel fraction.
In the present invention, the gel fraction of the recycled material is the ratio (%) of the mass of the recycled material that remains without being dissolved when the recycled material is dissolved in heated xylene to the mass of the recycled material before dissolution. It is shown and measured according to “4.25 degree of crosslinking” in JIS C 3005.
If the degree of the regeneration treatment is low and the gel fraction of the recycled material exceeds 40%, the properties as a wire coating material, particularly the mechanical properties and electrical properties required for the insulating layer may be inferior. The gel fraction of the recycled material is preferably 35% or less, and more preferably 5 to 30%. If the regeneration process is excessively carried out so as to reduce the gel fraction to less than 5%, the melt flow rate (MFR) becomes too large and the workability during the production of electric wires and cables may be reduced. The gel fraction of the recycled material is more preferably more than 10%.
廃材の再生処理は、ゲル分率を４０％以下に低下させることができれば特に制限はないが、例えば同方向に回転する２軸押出機を用いて、せん断速度２００ｓｅｃ−１以上、好ましくは３００〜８００ｓｅｃ−１、処理温度２５０〜４００℃で廃材を処理することにより、ゲル分率が４０％以下の再生材を得ることができる。なお、本発明における剪断速度とは、押出機のスクリューエレメント最外周部の周速度（ｍｍ／ｓ）をスクリューとバレルとのクリアランス（ｍｍ）で除した数値をいう。また、再生処理を行う前の廃材のゲル分率は通常５０〜７０％であるものが多いが、それ以外のものでも再生処理できる。
本発明に用いる再生材は、固形分を意味する。
The recycling treatment of the waste material is not particularly limited as long as the gel fraction can be reduced to 40% or less. For example, using a twin-screw extruder that rotates in the same direction, a shear rate of 200 sec −1 or more, preferably 300 to By processing the waste material at 800 sec −1 and a processing temperature of 250 to 400 ° C., a recycled material having a gel fraction of 40% or less can be obtained. In addition, the shear rate in this invention means the numerical value which remove | divided the peripheral speed (mm / s) of the screw element outermost part of an extruder by the clearance (mm) of a screw and a barrel. Further, the gel fraction of the waste material before the regeneration treatment is usually 50 to 70% in many cases, but other materials can be subjected to the regeneration treatment.
The recycled material used in the present invention means a solid content.
本発明においては、前記の再生材と、特定の性状の直鎖状低密度ポリエチレン（ＬＬＤＰＥ、以下、単に直鎖状低密度ポリエチレンという。）とを特定の混合比で混合した樹脂組成物を電線及びケーブルの被覆材として使用する。当該直鎖状低密度ポリエチレンは、架橋されたことのないポリエチレンであって、以下に述べる性状を有する。中でも、一度も成形されたことがない直鎖状低密度ポリエチレン（いわゆるバージン材）であることが好ましい。 In the present invention, a resin composition obtained by mixing the recycled material and a linear low density polyethylene (LLDPE, hereinafter simply referred to as linear low density polyethylene) having a specific property at a specific mixing ratio is used as an electric wire. Used as a cable covering material. The linear low-density polyethylene is a polyethylene that has never been crosslinked and has the properties described below. Among these, linear low density polyethylene (so-called virgin material) that has never been molded is preferable.
本発明に用いる直鎖状低密度ポリエチレンは、下記（Ａ）及び（Ｂ）の性状を満たす。
（Ａ）重量平均分子量Ｍｗと数平均分子量Ｍｎの比の値（Ｍｗ／Ｍｎ）が１３以上
（Ｂ）融点が１２０℃以上
The linear low density polyethylene used in the present invention satisfies the following properties (A) and (B).
(A) The value (Mw / Mn) of the ratio of the weight average molecular weight Mw to the number average molecular weight Mn is 13 or more. (B) The melting point is 120 ° C. or more.
上記のＭｗ及びＭｎは、ゲルパーミエイションクロマトグラフ（ＧＰＣ）法により下記の条件で測定した値である。
ＧＰＣ装置：Ａｌｌｉａｎｃｅ ＧＰＣＶ２０００（Ｗａｔｅｒｓ社製）
カラム：ＴＳＫ Ｇｅｌ ＧＭＨ ＨＲ−Ｈ（Ｓ）（ＴＯＳＯＨ社製）を２本
試料溶液：０．５質量％に調整した直鎖状低密度ポリエチレンのＴＨＦ（テトラヒドロフラン）溶液
溶離液：オルトジクロロベンゼン
検出：２５℃で屈折率検出器により検出
標準品：単分散ポリスチレン
Said Mw and Mn are the values measured by the gel permeation chromatograph (GPC) method on the following conditions.
GPC device: Alliance GPCV2000 (manufactured by Waters)
Column: 2 TSK Gel GMH HR-H (S) (manufactured by TOSOH) Sample solution: THF (tetrahydrofuran) solution of linear low density polyethylene adjusted to 0.5% by mass Eluent: Orthodichlorobenzene Detection: Detected by refractive index detector at 25 ° C Standard: Monodisperse polystyrene
本発明に用いる直鎖状低密度ポリエチレンのＭｗ／Ｍｎは１３〜２０であることが好ましく、１３〜１５であることがより好ましい。
上記（Ｂ）で規定する融点は、示差熱量計を用い、昇温速度１０℃／分で室温から昇温して得られる融解吸熱曲線の極大値を与える温度をいう。本発明に用いる直鎖状低密度ポリエチレンの融点は１２０〜１３０℃であることが好ましく、１２０〜１２５℃であることがより好ましい。
It is preferable that Mw / Mn of the linear low density polyethylene used for this invention is 13-20, and it is more preferable that it is 13-15.
The melting point defined in the above (B) refers to a temperature that gives a maximum value of a melting endothermic curve obtained by using a differential calorimeter and raising the temperature from room temperature at a temperature rising rate of 10 ° C./min. The melting point of the linear low density polyethylene used in the present invention is preferably 120 to 130 ° C, and more preferably 120 to 125 ° C.
本発明に用いる直鎖状低密度ポリエチレンの調製方法に特に制限はないが、例えば、圧力１００〜３００ＭＰａ、温度１５０〜３００℃の条件下で、エチレンとα−オレフィンとを共重合して得ることができる。当該αーオレフィンは、直鎖又は分岐鎖状の炭素数４〜１０のオレフィンが好ましく、例えば、プロピレン、１−ブテン、１−ペンテン、１−ヘキセン、４−メチル−１−ペンテン、１−オクテン、１−デセン等を挙げることができる。またこれらを２種類以上組み合わせて使用しても良い。
本発明に用いる直鎖状低密度ポリエチレンの密度は、２３±２℃におけるＪＩＳ−Ｋ６９２２に準拠した密度（以下、単に密度という。）が０．９１ｇ／ｃｍ３以上０．９３ｇ／ｃｍ３未満であることが好ましく、０．９２ｇ／ｃｍ３以上０．９３ｇ／ｃｍ３未満であることがより好ましい。
Although there is no restriction | limiting in particular in the preparation method of the linear low density polyethylene used for this invention, For example, it obtains by copolymerizing ethylene and alpha-olefin on the conditions of a pressure of 100-300 MPa and the temperature of 150-300 degreeC. Can do. The α-olefin is preferably a linear or branched olefin having 4 to 10 carbon atoms, such as propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, Examples include 1-decene. Two or more of these may be used in combination.
The density of the linear low density polyethylene used in the present invention has a density conforming to JIS-K6922 at 23 ± 2 ° C. (hereinafter, simply density of.) Is less than 0.91 g / cm 3 or more 0.93 g / cm 3 It is preferable that it is 0.92 g / cm 3 or more and less than 0.93 g / cm 3 .
本発明に用いる直鎖状低密度ポリエチレンは、メルトフローレート（ＭＦＲ）が０．２５ｇ／１０ｍｉｎを超えることが好ましい。
上記ＭＦＲは、ＪＩＳ Ｋ ７２１０に準拠して温度１９０℃、荷重２１．１８Ｎ（２．１６ｋｇ）の条件で測定した値である。本発明に用いる直鎖状低密度ポリエチレンのＭＦＲは０．２５〜２．５ｇ／１０ｍｉｎであることがより好ましく、０．３５〜１．０ｇ／１０ｍｉｎであることがさらに好ましい。
The linear low density polyethylene used in the present invention preferably has a melt flow rate (MFR) exceeding 0.25 g / 10 min.
The MFR is a value measured under conditions of a temperature of 190 ° C. and a load of 21.18 N (2.16 kg) in accordance with JIS K 7210. The MFR of the linear low density polyethylene used in the present invention is more preferably 0.25 to 2.5 g / 10 min, and further preferably 0.35 to 1.0 g / 10 min.
本発明では、再生材混合樹脂組成物中の再生材及び直鎖状低密度ポリエチレンの総含有量に占める再生材の割合が７５質量％（再生材及び直鎖状低密度ポリエチレンの総含有量を１００質量％とした場合）と高濃度であっても、ケーブルに要求される機械特性や電気特性を満足するものを得ることができる。
本発明において、再生材混合樹脂組成物中の再生材及び直鎖状低密度ポリエチレンの総含有量に占める再生材の割合は７０質量％以下であることが好ましく、６０質量％以下であることがより好ましい。また、リサイクルの観点から、再生材混合樹脂組成物中の再生材の含有量はより多いことが好ましい。具体的には、再生材混合樹脂組成物中の再生材及び直鎖状低密度ポリエチレンの総含有量に占める再生材の割合が５０質量％を超え、５１質量％以上であることが好ましい。本発明の電線及びケーブルは、再生材混合樹脂組成物中の再生材及び直鎖状低密度ポリエチレンの総含有量に占める再生材の割合を５０質量％よりも高めた場合であっても、当該再生材混合樹脂組成物で形成した被覆層の伸びに優れる。
なお、再生材混合樹脂組成物中の再生材の含有量を７５質量％以下にすると、再生材混合樹脂組成物中の再生材及び直鎖状低密度ポリエチレンの総含有量に占める直鎖状低密度ポリエチレンの割合は２５質量％以上になる。
In the present invention, the ratio of the recycled material to the total content of the recycled material and the linear low density polyethylene in the recycled material mixed resin composition is 75% by mass (the total content of the recycled material and the linear low density polyethylene is Even when the concentration is as high as 100% by mass, a material satisfying the mechanical and electrical properties required for the cable can be obtained.
In the present invention, the ratio of the recycled material to the total content of the recycled material and the linear low density polyethylene in the recycled material mixed resin composition is preferably 70% by mass or less, and preferably 60% by mass or less. More preferred. Further, from the viewpoint of recycling, it is preferable that the content of the recycled material in the recycled material mixed resin composition is larger. Specifically, the proportion of 50% by weight of recycled material to the total amount of recycled material and linear low density polyethylene regrind mixed resin composition exceeded, it is 51 mass% or more better good Yes. Even if the ratio of the recycled material in the total content of the recycled material and the linear low density polyethylene in the recycled material mixed resin composition is higher than 50% by mass, It is excellent in the elongation of the coating layer formed with the recycled material mixed resin composition.
In addition, when the content of the recycled material in the recycled material mixed resin composition is 75% by mass or less, the linear low in the total content of the recycled material and the linear low density polyethylene in the recycled material mixed resin composition. The proportion of density polyethylene is 25% by mass or more.
本発明の絶縁電線及びケーブルを製造する際、再生材混合樹脂組成物による被覆処理は、一般的に使用されている押出機を使用することが出来る。また再生材混合樹脂組成物には、通常樹脂組成物に添加される酸化防止剤、紫外線吸収剤などの添加剤を必要に応じて適量添加することもできる。
本発明において、再生材混合樹脂組成物中の再生材及び直鎖状低密度ポリエチレンの総含有量は、９５質量％以上であることが好ましく、９７〜１００質量％であることがより好ましい。
When manufacturing the insulated wire and cable of the present invention, a generally used extruder can be used for the coating treatment with the recycled material mixed resin composition. In addition, an appropriate amount of additives such as an antioxidant and an ultraviolet absorber that are usually added to the resin composition can be added to the recycled material mixed resin composition as necessary.
In the present invention, the total content of the recycled material and the linear low density polyethylene in the recycled material mixed resin composition is preferably 95% by mass or more, and more preferably 97 to 100% by mass.
本発明の絶縁電線及びケーブルは、被覆層をなす再生材混合樹脂組成物の架橋処理は必ずしも必要ではない。すなわち、被覆層をなす再生材混合樹脂組成物に架橋処理を施さなくても伸びが十分な電線及びケーブルが得られうる。
一方、絶縁電線・ケーブルの用途に応じて、被覆層をなす再生材混合樹脂組成物は架橋されていてもよい。架橋方法としては通常の架橋方法を適宜選択すればよく、例えば、有機過酸化物を添加した再生材混合樹脂組成物を電線に被覆したのち加熱処理する「過酸化物架橋方法」、シラン化合物と架橋助剤を添加した再生材混合樹脂組成物を電線に被覆したのち水分により架橋させる「シラン架橋方法」、電子線照射による「電子線架橋方法」などが挙げられる。
In the insulated wire and cable of the present invention, the crosslinking treatment of the recycled material mixed resin composition forming the coating layer is not necessarily required. That is, it is possible to obtain a sufficiently stretched electric wire and cable without subjecting the recycled material mixed resin composition forming the coating layer to a crosslinking treatment.
On the other hand, according to the use of an insulated wire / cable, the recycled material mixed resin composition forming the coating layer may be cross-linked. What is necessary is just to select a normal crosslinking method suitably as a crosslinking method, for example, the "peroxide crosslinking method" which heat-processes after coat | covering the recycled material mixed resin composition which added the organic peroxide, and a silane compound, Examples thereof include a “silane crosslinking method” in which a recycled material mixed resin composition to which a crosslinking aid has been added is coated on an electric wire and then crosslinked with moisture, an “electron beam crosslinking method” by electron beam irradiation, and the like.
本発明の絶縁電線及びケーブルにおける被覆層は１層でも複数の層であってもよい。電線識別等の目的により適宜、多層とすることが可能である。
また、本発明の絶縁電線及びケーブルは、被覆層のうち少なくとも１層が再生材混合樹脂組成物で構成されていればよいが、再生材混合樹脂組成物で構成された層が複数層、又は全層であってもよい。上記再生材混合樹脂組成物で構成された層以外の層は、通常の電線及びケーブルの被覆材として使用される樹脂であれば特に制限なく使用可能であり、例えば、ポリエチレン、ポリプロピレン、塩化ビニル樹脂等が挙げられる。
また、本発明の絶縁電線及びケーブルに用いる導体に特に制限は無く、銅線、アルミ線等の通常の導体を用いることができる。
The covering layer in the insulated wire and cable of the present invention may be a single layer or a plurality of layers. Depending on the purpose such as the identification of the electric wire, it is possible to form a multilayer as appropriate.
In addition, the insulated wire and cable of the present invention may be such that at least one of the covering layers is made of a recycled material mixed resin composition, but the layer made of the recycled material mixed resin composition has a plurality of layers, or It may be all layers. Layers other than the layer composed of the recycled material mixed resin composition can be used without particular limitation as long as it is a resin used as a coating material for ordinary electric wires and cables. For example, polyethylene, polypropylene, vinyl chloride resin Etc.
Moreover, there is no restriction | limiting in particular in the conductor used for the insulated wire and cable of this invention, Normal conductors, such as a copper wire and an aluminum wire, can be used.
図１は、本発明の好ましい実施態様である絶縁電線を示した斜視図であり、導体１が再生材混合樹脂で形成された絶縁層２で被覆されている。導体１としては、同種の絶縁電線に用いられている任意の導体を用いることができる。
FIG. 1 is a perspective view showing an insulated wire which is a preferred embodiment of the present invention, in which a
図２は、本発明の絶縁電線の別の実施態様を示した斜視図である。図示の絶縁電線は、導体が鋼線１１とその周りに配置されたアルミニウム導体１２からなる鋼心アルミ撚線（ＡＣＳＲ）であり、その上に上記の再生材混合樹脂で形成された絶縁層１３が設けられている。鋼線１１及びアルミニウム導体１２としては、従来の鋼心アルミ導体ポリエチレン絶縁電線（ＡＣＳＲ−ＯＣ）に用いられている任意の鋼線及びアルミニウム導体をそれぞれ用いることができる。
FIG. 2 is a perspective view showing another embodiment of the insulated wire of the present invention. The illustrated insulated wire is a steel core aluminum stranded wire (ACSR) composed of a
図３は、本発明のケーブルの一実施態様を示した斜視図である。図示のケーブルは、導体２１上に上記の再生材混合樹脂で形成された絶縁被覆層２２が設けられた３本の線心が、介在２３、押さえテープ２４を介して、シース２５で被覆されている。線心は図１の絶縁電線と同じ構造である。導体２１、介在２３、押さえテープ２４、シース２５としては、同種のケーブルに用いられている任意の導体、介在、押さえテープ、シースをそれぞれ用いることができる。
また、本発明におけるケーブルは、任意の光ファイバを上記の再生材混合樹脂で被覆した光ケーブルであっても良い。
FIG. 3 is a perspective view showing an embodiment of the cable of the present invention. In the illustrated cable, three wire cores provided with an insulating
The cable in the present invention may be an optical cable in which an arbitrary optical fiber is covered with the above-mentioned recycled material mixed resin.
以下、本発明を実施例に基づいて具体的に説明するが、本発明はこれらに限定されるものではない。 EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these.
実施例１〜８、比較例１〜８
（電線の製造）
下記の再生材と直鎖状低密度ポリエチレンとを表１及び２に示す割合（表１及び２に示す数値の単位は質量％である。）で混合して再生材混合樹脂組成物とし、これを断面積１２０ｍｍ２のアルミニウム導体上に押出温度２００℃、厚さ３ｍｍで押出して絶縁層（絶縁体）を形成し、シラン架橋方式により架橋させ、図２に示す構造のＡＣＳＲ−ＯＣ電線を得た（実施例１〜８、比較例１〜８）。
Examples 1-8, Comparative Examples 1-8
(Manufacture of electric wires)
The following recycled material and linear low-density polyethylene are mixed in the proportions shown in Tables 1 and 2 (the unit of the numerical values shown in Tables 1 and 2 is% by mass) to obtain a recycled material mixed resin composition. Is extruded on an aluminum conductor having a cross-sectional area of 120 mm 2 at an extrusion temperature of 200 ° C. and a thickness of 3 mm to form an insulating layer (insulator) and crosslinked by a silane crosslinking method to obtain an ACSR-OC electric wire having the structure shown in FIG. (Examples 1-8, Comparative Examples 1-8).
（再生材（ＸＬＰＥ再生材））
屋外型ポリエチレン電線の被覆廃材（シラン架橋されたポリエチレンの廃材）を平均粒径１５ｍｍ以下に粉砕後、同方向に回転する２軸押出機で３５０℃、せん断速度２５００ｓｅｃ−１で再生処理を行った。これによりゲル分率が５％、３３％及び４５％の再生材（それぞれ再生材Ａ〜Ｃという。）を得た。
(Recycled material (XLPE recycled material))
After pulverizing the waste coating material of the outdoor type polyethylene wire (waste material of silane-crosslinked polyethylene) to an average particle size of 15 mm or less, it was regenerated at 350 ° C. and a shear rate of 2500 sec −1 with a twin-screw extruder rotating in the same direction. . As a result, recycled materials having gel fractions of 5%, 33%, and 45% (referred to as recycled materials A to C, respectively) were obtained.
（直鎖状低密度ポリエチレン）
市販の直鎖状低密度ポリエチレンを用いて以下の実験を行なった。
ＮＵＣＧ５１３０（日本ユニカー社製、融点１２３℃ Ｍｗ／Ｍｎ＝１４ ＭＦＲ＝０．７ｇ／１０ｍｉｎ 密度０．９２３ｇ／ｃｍ３）
ＵＥ３２０（日本ポリエチレン社製、融点１２１℃ Ｍｗ／Ｍｎ＝１５ ＭＦＲ＝０．６ｇ／１０ｍｉｎ 密度０．９２２ｇ／ｃｍ３）
ＮＵＣＧ９３０１（日本ユニカー社製、融点１１９℃ Ｍｗ／Ｍｎ＝１２ ＭＦＲ＝０．７ｇ／１０ｍｉｎ 密度０．９２０ｇ／ｃｍ３)
ＵＢＥＣ５５０（宇部興産社製、融点１２３℃ Ｍｗ／Ｍｎ＝５ ＭＦＲ＝０．４５ｇ／１０ｍｉｎ 密度０．９２２ｇ／ｃｍ３)
(Linear low density polyethylene)
The following experiment was conducted using a commercially available linear low density polyethylene.
NUCG5130 (Nihon Unicar Co., Ltd., melting point 123 ° C. Mw / Mn = 14 MFR = 0.7 g / 10 min density 0.923 g / cm 3 )
UE320 (manufactured by Nippon Polyethylene Co., Ltd., melting point 121 ° C. Mw / Mn = 15 MFR = 0.6 g / 10 min density 0.922 g / cm 3 )
NUCG9301 (manufactured by Nippon Unicar Co., Ltd., melting point 119 ° C. Mw / Mn = 12 MFR = 0.7 g / 10 min density 0.920 g / cm 3 )
UBEC550 (manufactured by Ube Industries, melting point 123 ° C. Mw / Mn = 5 MFR = 0.45 g / 10 min density 0.922 g / cm 3 )
（電線の評価試験）
得られた電線を電力用規格Ｃ−２５０屋外用鋼心アルミ導体架橋ポリエチレン絶縁電線（ＡＣＳＲ−ＯＣ）（社団法人日本電気協会）に準拠し、下記の規格について評価試験を行い、下記の規格値を満たすか否かを調べた。結果を表１及び２に示す。なお、表１及び２中、耐トラッキング試験、絶縁抵抗及び耐電圧試験結果は、規格値をクリアするものを「良」、クリアしないものを「否」で示した。
規格値（ＡＣＳＲ−ＯＣ（１２０ｍｍ２））
・絶縁体の引張強度：１０ＭＰａ以上
・絶縁体の引張伸び：３５０％以上
・加熱残率（引張強度）：引張強度残率８５％以上
・加熱残率（引張伸び）：伸び残率６５％以上
・加熱変形率：４０％以下
・耐トラッキング試験：噴霧回数１０１回においても、０．５Ａ以上の電流が試料表面を流れないか、又は燃え上がらないこと
・絶縁抵抗：１５００ＭΩ・ｋｍ以上
・耐電圧試験：１２００Ｖの試験電圧に１分間耐えること
(Electric wire evaluation test)
The obtained electric wires were subjected to an evaluation test for the following standards in accordance with the power standard C-250 outdoor steel core aluminum conductor cross-linked polyethylene insulated electric wire (ACSR-OC) (NEC Association), and the following standard values It was investigated whether or not it satisfied. The results are shown in Tables 1 and 2. In Tables 1 and 2, the tracking resistance test, insulation resistance, and withstand voltage test results are shown as “good” when the standard value is cleared, and “not” when not.
Standard value (ACSR-OC (120 mm 2 ))
-Tensile strength of insulator: 10 MPa or more-Tensile elongation of insulator: 350% or more-Residual heating rate (tensile strength): Residual tensile strength rate of 85% or more-Residual heating rate (tensile elongation): Residual elongation rate of 65% or more・ Heating deformation rate: 40% or less ・ Tracking resistance test: Even when the number of sprays is 101, a current of 0.5 A or more does not flow or burn up on the sample surface ・ Insulation resistance: 1500 MΩ ・ km or more ・ Withstand voltage test : Withstand a test voltage of 1200V for 1 minute
表１及び２に示すように、本発明で規定するよりもゲル分率の高い再生材を用いた比較例５及び６では、絶縁体の引張伸びが小さく、加熱残率（引張強度）又は加熱変形率でも劣る結果となった。
また、本発明で規定するゲル分率の再生材を用いた場合であっても、再生材と直鎖状低密度ポリエチレンの総含有量に占める再生材の割合を８０質量％とすると、絶縁体の引張強度及び絶縁体の引張伸びが上記規格を満たさず、さらに加熱残率（引張伸び）、加熱変形率、耐トラッキング試験において劣る場合があった（比較例１〜４）。
また、本発明で規定する再生材を用いても、本発明で規定するよりもＭｗ／Ｍｎの低い直鎖状低密度ポリエチレンを用いた場合には、絶縁体の引張伸びが規格を満たさず、絶縁体の引張強度、加熱残率（引張伸び）、加熱変形率、耐トラッキング試験においても劣る場合があった（比較例７、８）。
As shown in Tables 1 and 2, in Comparative Examples 5 and 6 using a recycled material having a higher gel fraction than specified in the present invention, the tensile elongation of the insulator is small and the residual heating rate (tensile strength) or heating The deformation rate was also inferior.
Further, even when the regenerated material having the gel fraction defined in the present invention is used, if the ratio of the regenerated material to the total content of the regenerated material and the linear low-density polyethylene is 80% by mass, the insulator The tensile strength of the insulator and the tensile elongation of the insulator did not satisfy the above-mentioned standards, and there were cases where the residual heating rate (tensile elongation), heating deformation rate, and tracking resistance test were inferior (Comparative Examples 1 to 4).
Moreover, even when using the recycled material defined in the present invention, when using linear low density polyethylene having a lower Mw / Mn than defined in the present invention, the tensile elongation of the insulator does not meet the standard, There were cases where the tensile strength, residual heating rate (tensile elongation), heating deformation rate, and tracking resistance test of the insulator were inferior (Comparative Examples 7 and 8).
一方、本発明で規定する再生材と直鎖状低密度ポリエチレンとを本発明で規定する割合で混合した再生材混合樹脂組成物を用いた実施例１〜８の絶縁電線は、上記のいずれの規格も満足するものであった。すなわち、実施例１〜８では、再生材と直鎖状低密度ポリエチレンの総含有量に占める再生材の割合を５０質量％より高くしているが、このように再生材の含有量を高度に高めた条件下においても上記の規格を満足することが示されている。なお、このことから、再生材と直鎖状低密度ポリエチレンの総含有量に占める再生材の割合が５０質量％以下であれば、当然に上記の規格を満足することも理解できる。 On the other hand, the insulated wires of Examples 1 to 8 using the recycled material mixed resin composition in which the recycled material specified in the present invention and the linear low density polyethylene were mixed in the ratio specified in the present invention are any of the above. The standard was also satisfied. That is, in Examples 1-8, the ratio of the recycled material to the total content of the recycled material and the linear low density polyethylene is higher than 50% by mass. It has been shown that the above standards are satisfied even under elevated conditions. From this, it can be understood that the above-mentioned standard is naturally satisfied if the ratio of the recycled material to the total content of the recycled material and the linear low density polyethylene is 50% by mass or less.
１ 導体
２ 絶縁被覆層
１１ 鋼線
１２ アルミニウム導体
１３ 絶縁被覆層
２１ 導体
２２ 絶縁被覆層
２３ 介在
２４ 押さえテープ
２５ シース
DESCRIPTION OF
Claims (4)
（Ａ）重量平均分子量Ｍｗと数平均分子量Ｍｎの比の値（Ｍｗ／Ｍｎ）が１３以上、
（Ｂ）融点が１２０℃以上。 At least one layer of the coating layer is a recycled material having a gel fraction of 40% or less derived from a waste material containing a crosslinked polyolefin homopolymer and / or a crosslinked olefin copolymer and a property satisfying the following properties (A) and (B): A recycled material mixed resin composition comprising a chain low density polyethylene, wherein a ratio of the recycled material to a total content of the recycled material and the linear low density polyethylene is more than 50% by mass and 75 % by mass or less. Insulated wire formed:
(A) The value (Mw / Mn) of the ratio of the weight average molecular weight Mw to the number average molecular weight Mn is 13 or more,
(B) Melting | fusing point is 120 degreeC or more.
（Ａ）重量平均分子量Ｍｗと数平均分子量Ｍｎの比の値（Ｍｗ／Ｍｎ）が１３以上、
（Ｂ）融点が１２０℃以上。 An insulating layer of an insulated wire in which a conductor is covered with an insulating layer, a recycled material having a gel fraction of 40% or less derived from a waste material containing a crosslinked polyolefin homopolymer and / or a crosslinked olefin copolymer, and the following (A) and ( B) a linear low density polyethylene that satisfies the properties of B), and the ratio of the recycled material to the total content of the recycled material and the linear low density polyethylene is more than 50% by mass and 75 % by mass or less. Insulated wires made of recycled material mixed resin composition:
(A) The value (Mw / Mn) of the ratio of the weight average molecular weight Mw to the number average molecular weight Mn is 13 or more,
(B) Melting | fusing point is 120 degreeC or more.
（Ａ）重量平均分子量Ｍｗと数平均分子量Ｍｎの比の値（Ｍｗ／Ｍｎ）が１３以上、
（Ｂ）融点が１２０℃以上。
A recycled material having a gel fraction of 40% or less derived from waste material containing a crosslinked polyolefin homopolymer and / or a crosslinked olefin copolymer, and a linear low density polyethylene satisfying the following properties (A) and (B): The recycled material mixed resin composition in which the ratio of the recycled material to the total content of the recycled material and the linear low-density polyethylene is more than 50% by mass and 75 % by mass or less:
(A) The value (Mw / Mn) of the ratio of the weight average molecular weight Mw to the number average molecular weight Mn is 13 or more,
(B) Melting | fusing point is 120 degreeC or more.
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| US20120217037A1 (en) | 2011-02-25 | 2012-08-30 | Kouichi Nakashima | Method of forming coated conductor and coated conductor formed thereby |
| CA2968647C (en) | 2014-12-22 | 2018-05-22 | Borealis Ag | Composition based on recycled polyethylene from cable waste |
| CN113674936B (en) * | 2021-08-05 | 2023-09-01 | 深圳金信诺高新技术股份有限公司 | Preparation method, insulator and wire |
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| JP2010177183A (en) * | 2009-02-02 | 2010-08-12 | Viscas Corp | Insulated wire in which anti-tracking performance is improved, and manufacturing method thereof |
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