JPH0819289B2 - Resin composition for power cable coating - Google Patents
Resin composition for power cable coatingInfo
- Publication number
- JPH0819289B2 JPH0819289B2 JP62043594A JP4359487A JPH0819289B2 JP H0819289 B2 JPH0819289 B2 JP H0819289B2 JP 62043594 A JP62043594 A JP 62043594A JP 4359487 A JP4359487 A JP 4359487A JP H0819289 B2 JPH0819289 B2 JP H0819289B2
- Authority
- JP
- Japan
- Prior art keywords
- ldpe
- resin composition
- composition
- power cable
- present
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Organic Insulating Materials (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は被覆用樹脂組成物に関し、更に詳しくは電線
や電力ケーブルの被覆用組成物として極めて好適な樹脂
組成物に関する。TECHNICAL FIELD The present invention relates to a coating resin composition, and more particularly to a resin composition extremely suitable as a coating composition for electric wires and power cables.
電線や電力ケーブルの絶縁被覆用組成物として各種の
樹脂組成物が使用されておりそのうちの一つとしてポリ
エチレンを使用した組成物がある。そしてこの際のポリ
エチレンとしては、密度の低い所謂低密度ポリエチレン
と称されるものから密度の高い所謂高密度ポリエチレン
と称される各種のポリエチレンが適宜に使用されてい
る。Various resin compositions are used as insulating coating compositions for electric wires and power cables, and one of them is a composition using polyethylene. As the polyethylene at this time, various polyethylenes having a low density, so-called low-density polyethylene to a high density, so-called high-density polyethylene are appropriately used.
而してこのポリエチレン組成物を用いた電線やケーブ
ルに於いては、これ等の端末部に於いてポリエチレン組
成物から成る被覆絶縁層が収縮し（所謂シュリンクバッ
クと称される）、この収縮が端末部の破壊原因の大きな
要因となっている。Thus, in an electric wire or cable using this polyethylene composition, the covering insulating layer made of the polyethylene composition shrinks at these terminals (so-called shrinkback), and this shrinkage occurs. It is a major cause of destruction of the terminal.
またこの種電線やケーブルに於いては、端末部や破壊
部分からの水の侵入に基づく所謂水トリーと称される難
点も生ずることが多い。In addition, in this kind of electric wire or cable, there is often a problem called so-called water tree due to the intrusion of water from the terminal portion or the broken portion.
本発明が解決しようとする問題点は、従来の電線やケ
ーブルに於ける上記端末部のシュリンクバックに基づく
難点並びに上記水トリーに基づく難点を解消することで
あり、更に詳しくは、電線やケーブルの端末部に於ける
絶縁体層の収縮を大幅に減少すると共に、水のケーブル
内への侵入を防止して、上記難点を解消し得る樹脂組成
物を開発することである。The problem to be solved by the present invention is to solve the problems due to the shrink back of the terminal portion and the problems due to the water tree in the conventional electric wires and cables. More specifically, It is an object of the present invention to develop a resin composition that can significantly reduce contraction of an insulating layer in a terminal portion and prevent water from entering a cable, thereby solving the above-mentioned problems.
この問題点は、超低密度ポリエチレン単独、またはこ
れと低密度ポリエチレンとを含有する樹脂組成物を被覆
用組成物として使用することによって達成される。即ち
本発明は、密度0.900〜0.910g/cm3の超低密度ポリエチ
レン、またはこれと密度0.912〜0.930g/cm3の低密度ポ
リエチレンと、架橋剤とを含有して成る電力ケーブル被
覆用樹脂組成物に係るものである。This problem is achieved by using an ultra-low density polyethylene alone or a resin composition containing the ultra-low density polyethylene as a coating composition. That is, the present invention is a low density polyethylene having a density of 0.900~0.910g / cm 3 of ultra low density polyethylene or its density 0.912~0.930g / cm 3,, power cable coating resin composition comprising a crosslinking agent It relates to things.
本発明の組成物は、超低密度ポリエチレン（以下Ｖ−
LDPEという）単独、またはこれと低密度ポリエチレン
（以下LDPEという）を含有して成るものであり、またこ
れ等の少なくとも１種を架橋せしめた組成物をも包含す
る。The composition of the present invention is an ultra-low density polyethylene (hereinafter referred to as V-
LDPE) or a low density polyethylene (hereinafter referred to as LDPE) alone, and a composition obtained by crosslinking at least one of these is also included.
本発明に於いて使用するＶ−LDPEは従来この種電線や
ケーブルの絶縁被覆用組成物として全く使用されたこと
の無いものであり、その特徴とする所は従来の低密度ポ
リエチレンに比し、更に一段と密度が低いところにあ
る。The V-LDPE used in the present invention has never been used as an insulating coating composition for electric wires and cables of this kind in the past. Its characteristic feature is that it is lower than conventional low density polyethylene. It is even lower in density.
本発明に於いて使用するＶ−LDPEはその密度が0.900
〜0.910g/cm3である。従来のLDPEの密度は0.912〜0.93g
/cm3程度であり、この点に於いて明確に区別される。こ
のような極めて低い密度を有するポリエチレンが本発明
に於いて使用される。The V-LDPE used in the present invention has a density of 0.900.
It is about 0.910 g / cm 3 . Conventional LDPE has a density of 0.912-0.93g
/ cm 3 , which is clearly distinguished in this respect. Polyethylene having such an extremely low density is used in the present invention.
本発明で使用するＶ−LDPEは通常メルトインデックス
（MIという）は、0.2〜10.0程度であり、また弾性率に
於いてもLDPEに比し同等以上である。このようなＶ−LD
PEをこれ等単独で、またはLDPEと併用するときは電線や
電力ケーブルのシュリンクバックを未然に防止できると
共に水トリーの難点も大きく向上することが出来る。The V-LDPE used in the present invention usually has a melt index (referred to as MI) of about 0.2 to 10.0, and the elastic modulus is equal to or higher than that of LDPE. Such a V-LD
When PE is used alone or in combination with LDPE, shrink back of electric wires and power cables can be prevented, and the difficulty of the water tree can be greatly improved.
本発明に於いてＶ−LDPEと必要に応じ併用されるLDPE
はその密度0.912〜0.930g/cm3程度のものであり、その
使用割合はＶ−LDPE100重量部に対し、LDPE2〜100重量
部、好ましくは５〜50重量部程度である。この際LDPEの
使用割合が多くなりすぎると所期の効果が充分に期待出
来ない。このLDPEとしては直鎖状及び分岐状のものがい
ずれも使用出来るが、直鎖状のものが特に好ましい。こ
れ等LDPEとしては通常そのMIは0.3〜5.0程度のものが使
用される。LDPE used in combination with V-LDPE according to the invention
Has a density of about 0.912 to 0.930 g / cm 3 , and its use ratio is about 2 to 100 parts by weight of LDPE, preferably about 5 to 50 parts by weight, relative to 100 parts by weight of V-LDPE. At this time, if the proportion of LDPE used is too large, the desired effect cannot be expected sufficiently. As this LDPE, both linear and branched ones can be used, but the linear one is particularly preferable. As these LDPEs, those having MI of about 0.3 to 5.0 are usually used.
本発明の組成物には必要に応じ、この種樹脂組成物に
従来から使用されて来た各種の添加剤を配合することが
出来、たとえば、老化防止剤、難燃剤、充填剤、着色
剤、電圧安定剤、滑剤、加工助剤、紫外線吸収剤等を例
示することが出来る。If necessary, the composition of the present invention may be mixed with various additives conventionally used in this kind of resin composition, for example, an antioxidant, a flame retardant, a filler, a colorant, Examples thereof include voltage stabilizers, lubricants, processing aids, and ultraviolet absorbers.
また本発明の組成物には、上記Ｖ−LDPE及びLDPEの少
なくとも１種を架橋したものが使用される。この際の架
橋手段は従来から用いられて来た各種の架橋手段、たと
えば化学架橋剤を用いた加熱架橋法、電子線照射架橋
法、水架橋法等が適宜に採用される。Further, in the composition of the present invention, a composition obtained by crosslinking at least one of the above V-LDPE and LDPE is used. As the crosslinking means in this case, various conventionally used crosslinking means, for example, a heating crosslinking method using a chemical crosslinking agent, an electron beam irradiation crosslinking method, a water crosslinking method, etc. are appropriately adopted.
本発明に於いては、Ｖ−LDPEを使用するので電線やケ
ーブルの端末部に於ける収縮を大幅に減少出来、ひいて
は端末接続部の信頼性を大きく向上せしめることが出来
る。In the present invention, since V-LDPE is used, the contraction at the terminal portion of the electric wire or cable can be greatly reduced, and the reliability of the terminal connecting portion can be greatly improved.
また本発明組成物を用いて被覆した電線やケーブルは
耐水トリー性も大きく向上するという優れた効果があ
る。Further, an electric wire or cable coated with the composition of the present invention has an excellent effect that the water tree resistance is also greatly improved.
以下に実施例と比較例とを示して本発明の特徴とする
所をより明確とする。Hereinafter, the features of the present invention will be made clearer by showing Examples and Comparative Examples.
実施例１〜２及び比較例１〜４ ケーブルに於けるシュリンクバック現象は、製造工程
に於ける加熱冷却条件が表面層と内部で異なることによ
って生じる内部残留応力に起因する。またこの残留応力
は、膨張（収縮）率の大きいものほど大きく、その点に
於いて熱膨張率の小さいものほどシュリンクバック現象
が小さくなると考えられる。The shrinkback phenomenon in the cables of Examples 1 and 2 and Comparative Examples 1 to 4 is caused by the internal residual stress caused by the heating and cooling conditions in the manufacturing process being different between the surface layer and the inside. Further, it is considered that the larger the expansion (contraction) coefficient is, the larger the residual stress is, and the smaller the coefficient of thermal expansion is, the smaller the shrinkback phenomenon is.
Ｖ−LDPE（密度0.906g/cm3、MI0.8、以下PE−１とい
う）を用いて半径約0.56cm、長さ1cm、体積１cm3の円柱
状の成形体を作製し、その一方の端面を固定し、長さ方
向の熱膨張収縮率を測定した。結果は3.3％であった。Using V-LDPE (density 0.906 g / cm 3 , MI 0.8, hereinafter referred to as PE-1), a cylindrical molded body with a radius of about 0.56 cm, a length of 1 cm and a volume of 1 cm 3 was prepared, and one end surface of the molded body was manufactured. Was fixed and the coefficient of thermal expansion and contraction in the length direction was measured. The result was 3.3%.
また各種密度のポリエチレンを下記第１表に示す配合
組成で組成物を調整し、これを用いて常法によって被覆
電線となした。このものの端部の収縮特性を測定した。
この結果は後記第２表の通りであった。A polyethylene wire having various densities was prepared to have a composition shown in Table 1 below, and a coated wire was prepared by a conventional method using the composition. The shrinkage property of the end of this product was measured.
The results are shown in Table 2 below.
尚上記第１表に於いて使用した各種ポリエチレンの詳
細は以下の通りである。Details of the various polyethylenes used in Table 1 are as follows.
〈電線の製造方法〉 通常の乾式架橋法を用いて絶縁厚24mm、導体2000mm2
のケーブルを製造した。 <Wire production method> Insulation thickness 24mm, conductor 2000mm 2
Manufactured cables.
〈熱膨張率の測定方法〉 熱膨張率の測定は室温〜200度での熱変形率をTMA（Th
ermal Mechanical Analyzer）を用いて測定した。<Measurement method of coefficient of thermal expansion> The coefficient of thermal expansion is measured by measuring the thermal deformation rate from room temperature to 200 degrees TMA (Th
ermal Mechanical Analyzer).
〈電線のシュリンクバックの測定〉 ケーブル2mを切断し、１週間室温放置後、被覆絶縁層
が収縮した長さを測定し、初期長（2m）に対する割合を
もって収縮率とした。<Measurement of Shrinkback of Electric Wire> After cutting 2 m of the cable and allowing it to stand at room temperature for 1 week, the length of shrinkage of the coating insulating layer was measured, and the ratio to the initial length (2 m) was defined as the shrinkage rate.
第２表 Table 2
Claims (1)
チレン、またはこれと密度0.912〜0.930g/cm3の低密度
ポリエチレンと、架橋剤とを含有して成る電力ケーブル
被覆用樹脂組成物。1. A and low density polyethylene having a density of 0.900~0.910g / cm 3 of ultra low density polyethylene or its density 0.912~0.930g / cm 3,, power cable coating resin composition comprising a crosslinking agent Stuff.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62043594A JPH0819289B2 (en) | 1987-02-25 | 1987-02-25 | Resin composition for power cable coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62043594A JPH0819289B2 (en) | 1987-02-25 | 1987-02-25 | Resin composition for power cable coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63210150A JPS63210150A (en) | 1988-08-31 |
| JPH0819289B2 true JPH0819289B2 (en) | 1996-02-28 |
Family
ID=12668124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62043594A Expired - Fee Related JPH0819289B2 (en) | 1987-02-25 | 1987-02-25 | Resin composition for power cable coating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0819289B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2522966B2 (en) * | 1987-10-13 | 1996-08-07 | 株式会社フジクラ | Polyethylene composition |
| JPH0268810A (en) * | 1988-09-02 | 1990-03-08 | Fujikura Ltd | Power cable |
| JP2811986B2 (en) * | 1991-03-27 | 1998-10-15 | 大日本インキ化学工業株式会社 | Polyethylene resin composition and extrusion coating material |
| US5414040A (en) * | 1992-09-15 | 1995-05-09 | The Dow Chemical Company | Formulated ethylene/α-olefin elastomeric compounds |
| US5861463A (en) * | 1996-10-31 | 1999-01-19 | The Dow Chemical Company | Impact-modified thermoplastic polyolefins and articles fabricated therefrom |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59215342A (en) * | 1983-05-24 | 1984-12-05 | Nippon Petrochem Co Ltd | Resin composition for power cable |
-
1987
- 1987-02-25 JP JP62043594A patent/JPH0819289B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63210150A (en) | 1988-08-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |