JPS6318802B2 - - Google Patents
Info
- Publication number
- JPS6318802B2 JPS6318802B2 JP54163402A JP16340279A JPS6318802B2 JP S6318802 B2 JPS6318802 B2 JP S6318802B2 JP 54163402 A JP54163402 A JP 54163402A JP 16340279 A JP16340279 A JP 16340279A JP S6318802 B2 JPS6318802 B2 JP S6318802B2
- Authority
- JP
- Japan
- Prior art keywords
- pvc
- weight
- graphite
- composition
- cable
- 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
Links
- 239000000203 mixture Substances 0.000 claims description 15
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 14
- 239000004800 polyvinyl chloride Substances 0.000 claims description 14
- 239000004014 plasticizer Substances 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 6
- 229920012485 Plasticized Polyvinyl chloride Polymers 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- SAOKZLXYCUGLFA-UHFFFAOYSA-N bis(2-ethylhexyl) adipate Chemical compound CCCCC(CC)COC(=O)CCCCC(=O)OCC(CC)CCCC SAOKZLXYCUGLFA-UHFFFAOYSA-N 0.000 description 2
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 239000011342 resin composition Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Insulated Conductors (AREA)
Description
本発明は固有熱抵抗値の小さい新規なポリ塩化
ビニル樹脂（以下PVCと略す）組成物をジヤケ
ツトの材料として用いた電力ケーブルに関する。
電力ケーブルのジヤケツトは、ケーブルの最外
層に位置し、その下にある金属製の外部導体また
シースの保護および防食のために用いられるので
防食層とも呼ばれる。これまでその材料として
PVC組成物およびポリエチレン樹脂組成物が用
いられているが、そのうちPVC組成物は、PVC、
可塑剤、安定剤と若干の着色剤を含むプレーンに
近い可塑化PVC組成物であつた。その固有熱抵
抗ρ2は約600℃・cm／Ｗである。このρ2の低減は
ジヤケツトの熱抵抗R2の低減をもたらすので、
もしこのρ2を低減することができればR2が低減
し、導体、誘電体およびシース等で発生した熱を
ケーブル外部へ放散する効果が高まり、その効果
の分だけケーブルの送電容量を増大することがで
きる。
以上に鑑み、本発明の目的は低いρ2を有し、し
かも体積抵抗率ρ、機械的強度等の特性において
もすぐれた性能を有するPVC組成物および該組
成物をジヤケツトとして使用した電力ケーブルを
提供することにある。
本発明は、PVC50〜70重量％と可塑剤20〜40
重量％と平均粒径３〜30μの黒鉛５〜25重量％と
からなる可塑化PVC樹脂組成物をジヤケツトに
用いたことを特徴とする電力ケーブルに関する。
本発明においてPVCとしては重合度800〜1600
の市販の製品を用いることができる。可塑剤とし
てはジオクチルフタレート（DOP）のようなフ
タル酸系可塑剤、ジ−（２−エチルヘキシル）ア
ジペート（DOA）のようなアジピン酸系可塑剤、
その他PVC用可塑剤はいずれも使用することが
できる。
黒鉛としては、鱗状黒鉛・土状黒鉛があり、本
発明では平均粒径が３〜30μであればいずれでも
よい。粒径が3μ未満ではρ2低減が少なく、一方粒
径30μを越すと、分散性が悪くなる。この点で一
層好ましい粒径範囲は５〜20μさらに６〜15μで
ある。この点では鱗状黒鉛が好ましい。ところで
上記の可塑剤が20重量％未満では可撓性がなく弱
くなり、また40重量％より多いと機械的強度が低
く、ベタつきが生ずる。
一方黒鉛が５重量％未満のときはρ2低減効果が
少なく、また25重量％より多いと組成物が機械的
に弱くなつたり、電導性を帯びるから好ましくな
い。より好ましい範囲はPVC50〜65重量％、可
塑剤20〜35重量％、黒鉛５〜25重量％である。２
種以上の黒鉛の併用はさしつかえない。可塑剤、
PVCについても同様である。
本発明の組成物はPVCに通常配合される安定
剤、滑剤等を含んでもよく、そのほか必要に応じ
顔料、充填剤、難燃剤などを含んでもよい。しか
しながらその種類および添加量は、本発明の目的
である組成物の固有熱抵抗の低減に支障があつて
はならないことは勿論である。
上記の各成分の配合の順序は任意である。従つ
てPVCと可塑剤とを先ず配合し、一旦プレーン
な可塑化PVCをつくつて他の成分を配合するこ
ともできるし、また全成分を一挙にミキサー、ロ
ール等で混練して配合してもよい。このようにし
て得られた本発明の可塑化PVC組成物は、常法
によりケーブルの最外側へ例えば押出法により被
覆することができる。
実施例
第１表に示す配合を160℃のロールミルで混練
し、次いで170℃で熱板プレスして１mmの厚さの
シートとし、各特性を測定した。各実施例とも他
の特性を損うことなく固有熱抵抗ρ2を低減してい
ることがわかる。
The present invention relates to a power cable using a new polyvinyl chloride resin (hereinafter abbreviated as PVC) composition having a low specific thermal resistance value as a jacket material. The jacket of a power cable is located at the outermost layer of the cable and is used to protect and prevent corrosion of the underlying metal outer conductor or sheath, so it is also called a corrosion protection layer. Until now, as the material
PVC compositions and polyethylene resin compositions are used, among which PVC compositions are PVC,
It was a nearly plain plasticized PVC composition containing plasticizers, stabilizers and some colorants. Its specific thermal resistance ρ 2 is approximately 600° C.cm/W. This reduction in ρ 2 results in a reduction in the thermal resistance R 2 of the jacket, so
If this ρ 2 can be reduced, R 2 will be reduced and the effect of dissipating the heat generated in the conductor, dielectric, sheath, etc. to the outside of the cable will increase, and the power transmission capacity of the cable will be increased by that effect. Can be done. In view of the above, the object of the present invention is to provide a PVC composition having a low ρ 2 and excellent performance in terms of volume resistivity ρ, mechanical strength, etc., and a power cable using the composition as a jacket. It is about providing. The present invention uses PVC50-70% by weight and plasticizer 20-40%.
The present invention relates to a power cable characterized in that a jacket is made of a plasticized PVC resin composition comprising 5% to 25% by weight of graphite having an average particle size of 3 to 30 μm. In the present invention, PVC has a polymerization degree of 800 to 1600.
Commercially available products can be used. Examples of plasticizers include phthalic acid plasticizers such as dioctyl phthalate (DOP), adipic acid plasticizers such as di-(2-ethylhexyl) adipate (DOA),
Any other plasticizer for PVC can be used. Graphite includes scaly graphite and earthy graphite, and in the present invention, any of them may be used as long as the average particle size is 3 to 30 μm. When the particle size is less than 3μ, the reduction in ρ 2 is small, while when the particle size exceeds 30μ, the dispersibility becomes poor. In this respect, a more preferred particle size range is 5 to 20 microns, and more preferably 6 to 15 microns. In this respect, flaky graphite is preferred. By the way, if the above-mentioned plasticizer is less than 20% by weight, it will not have flexibility and will be weak, and if it is more than 40% by weight, the mechanical strength will be low and stickiness will occur. On the other hand, when the graphite content is less than 5% by weight, the effect of reducing ρ 2 is small, and when it is more than 25% by weight, the composition becomes mechanically weak and becomes electrically conductive, which is not preferable. More preferred ranges are 50 to 65% by weight of PVC, 20 to 35% by weight of plasticizer, and 5 to 25% by weight of graphite. 2
It is permissible to use graphite in combination with more than one species. plasticizer,
The same applies to PVC. The composition of the present invention may contain stabilizers, lubricants, etc. that are commonly added to PVC, and may also contain pigments, fillers, flame retardants, etc., if necessary. However, it goes without saying that the type and amount added must not impede the reduction of the specific thermal resistance of the composition, which is the object of the present invention. The order of blending the above components is arbitrary. Therefore, it is possible to first mix PVC and a plasticizer to create plain plasticized PVC and then mix the other ingredients, or it is possible to mix all the ingredients at once by kneading them with a mixer, rolls, etc. good. The plasticized PVC composition of the present invention thus obtained can be coated on the outermost side of a cable by a conventional method, for example, by extrusion. Examples The formulations shown in Table 1 were kneaded in a roll mill at 160°C, then hot plate pressed at 170°C to form a sheet with a thickness of 1 mm, and each property was measured. It can be seen that in each example, the specific thermal resistance ρ 2 is reduced without impairing other characteristics.
【表】
このようにして本発明によれば、本発明で用い
るジヤケツトはρ2において従来電力ケーブル用の
ジヤケツトに用いられている可塑化PVC組成物
のρ2の約2/3ないし1/2であるので、それに対応し
てケーブル特にOFケーブルを洞道に布設した場
合送電容量が従来のケーブルより大きくとること
ができ省エネルギーに役立つ。[Table] Thus, according to the invention, the jacket used in the invention has a ρ 2 of about 2/3 to 1/2 of the ρ 2 of plasticized PVC compositions conventionally used in jackets for power cables. Therefore, if a cable, especially an OF cable, is laid in a tunnel in response to this, the power transmission capacity can be larger than that of conventional cables, which is useful for energy conservation.
Claims (1)
重量％、および平均粒子径３〜30μｍの黒鉛５〜
25重量％とからなるポリ塩化ビニル組成物をジヤ
ケツトに用いてなる電力ケーブル。1 Polyvinyl chloride 50-70% by weight, plasticizer 20-40%
% by weight, and graphite with an average particle size of 3 to 30 μm from 5 to
A power cable whose jacket is made of a polyvinyl chloride composition containing 25% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16340279A JPS5686412A (en) | 1979-12-14 | 1979-12-14 | Power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16340279A JPS5686412A (en) | 1979-12-14 | 1979-12-14 | Power cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5686412A JPS5686412A (en) | 1981-07-14 |
| JPS6318802B2 true JPS6318802B2 (en) | 1988-04-20 |
Family
ID=15773205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16340279A Granted JPS5686412A (en) | 1979-12-14 | 1979-12-14 | Power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5686412A (en) |
-
1979
- 1979-12-14 JP JP16340279A patent/JPS5686412A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5686412A (en) | 1981-07-14 |
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