JPH0379641A - Expandable composition - Google Patents
Expandable compositionInfo
- Publication number
- JPH0379641A JPH0379641A JP21677789A JP21677789A JPH0379641A JP H0379641 A JPH0379641 A JP H0379641A JP 21677789 A JP21677789 A JP 21677789A JP 21677789 A JP21677789 A JP 21677789A JP H0379641 A JPH0379641 A JP H0379641A
- Authority
- JP
- Japan
- Prior art keywords
- polyolefin
- foaming
- swelling ratio
- pts
- parts
- 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.)
- Pending
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 13
- 229920000098 polyolefin Polymers 0.000 claims abstract description 34
- 230000008961 swelling Effects 0.000 claims abstract description 23
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 14
- 239000004604 Blowing Agent Substances 0.000 claims description 14
- 239000004088 foaming agent Substances 0.000 abstract description 5
- 239000004156 Azodicarbonamide Substances 0.000 abstract description 3
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 abstract description 3
- 235000019399 azodicarbonamide Nutrition 0.000 abstract description 3
- 238000005187 foaming Methods 0.000 description 23
- 239000004020 conductor Substances 0.000 description 6
- 239000012212 insulator Substances 0.000 description 6
- 239000006260 foam Substances 0.000 description 4
- 229920001684 low density polyethylene Polymers 0.000 description 4
- 239000004702 low-density polyethylene Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 229920001903 high density polyethylene Polymers 0.000 description 3
- 239000004700 high-density polyethylene Substances 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920001179 medium density polyethylene Polymers 0.000 description 2
- 239000004701 medium-density polyethylene Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000270295 Serpentes Species 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Organic Insulating Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、電気的特性且つ機械的強度に優れた高発泡ポ
リオレフィン絶縁電線用の発泡性組成物に閏する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a foamable composition for highly foamed polyolefin insulated wires having excellent electrical properties and mechanical strength.
導体心線上にポリオレフィン発泡体を被覆した発泡ポリ
オレフィン、特に発泡ポリエチレン絶縁電線は、通信ケ
ーブルを始めとする各種の用途に実用化されている。Foamed polyolefin, especially foamed polyethylene insulated wire, in which a conductor core wire is coated with a polyolefin foam, has been put to practical use in various applications including communication cables.
この発泡ポリオレフィン絶縁体は、適当な発泡剤を使用
してプラスチックと共にスクリューによる押出法によっ
て製造されるのが一般的である。The foamed polyolefin insulation is generally manufactured by screw extrusion with plastic using a suitable blowing agent.
近年、ケーブルの電気特性の向上及びケーブルの細径化
が求められ、このため発泡絶縁電線にも発泡度50%以
上の高発泡化が要求されてきた。高発泡化にはプラスチ
ックの弾性が要因であり、弾性の指標となるプラスチッ
クのスエリング比が高発泡プラスチック絶縁体を得る上
で大きな関係を有していることが判明している。In recent years, improvements in the electrical properties of cables and reduction in cable diameter have been required, and for this reason, foam insulated wires have also been required to have a high degree of foaming with a degree of foaming of 50% or more. The elasticity of the plastic is a factor in achieving high foaming, and it has been found that the swelling ratio of the plastic, which is an index of elasticity, has a significant relationship in obtaining a highly foamed plastic insulator.
ここでスエリング比:SRは、JIS K6760ま
たはASTM D123B−70に規定されたメルト
インデクサ−でメルトインデックス二Mlを測定する際
に得られる押出物の外径をdsとし、メルトインデクサ
−にセットされているオリフィスの内径をdoとしたと
き次式(a)で表されるものである。Here, the swelling ratio: SR is defined as the outer diameter of the extrudate obtained when measuring the melt index 2Ml with a melt indexer specified in JIS K6760 or ASTM D123B-70, and ds is the outer diameter of the extrudate set in the melt indexer. It is expressed by the following equation (a), where do is the inner diameter of the orifice.
d。d.
注)ds、doはいずれも常温での測定値を用いる。Note: Both ds and do use values measured at room temperature.
また、発泡度は次式(+))で定義される。Further, the degree of foaming is defined by the following formula (+).
ρ 0
ρ0:発泡前の樹脂の密度
ρ:発泡体の密度
しかし一方では、発泡度を高くした場合、発泡体の機械
的強度が低下し、電線の製造時または使用時に損傷を受
は易くなるという問題点が生してく る。ρ 0 ρ0: Density of resin before foaming ρ: Density of foam However, on the other hand, when the degree of foaming is increased, the mechanical strength of the foam decreases, making it more susceptible to damage during manufacturing or use of electric wires. The problem arises.
この問題点を解決すべく、導体上に発泡剤とスエリング
比55%以上の材料を含む発泡用ポリオレフィンを被覆
するという「高発泡ポリオレフィン絶縁電線の製造方法
」(特公昭5B−11047号公報)が提案されている
。In order to solve this problem, a ``method for producing highly foamed polyolefin insulated wire'' (Japanese Patent Publication No. 5B-11047) was developed in which the conductor is coated with foaming polyolefin containing a foaming agent and a material with a swelling ratio of 55% or more. Proposed.
(発明が解決しようとする課題)
上記公報に開示の製造方法によれば、スエリング比55
%以上の材料を含む発泡用ポリオレフィンを用いて発泡
度55%以上の高発泡絶縁体を得ている。(Problems to be Solved by the Invention) According to the manufacturing method disclosed in the above publication, the swelling ratio is 55.
A highly foamed insulator with a foaming degree of 55% or more is obtained using a foaming polyolefin containing a material of 55% or more.
上記公報には、スエリング比55%以上のポリオレフィ
ンとして低密度ポリエチレン(LDPE)高密度ポリエ
チレン(HDPE)、ポリプロピレンなどを挙げ、参考
例としてこれらのポリオレフィン並びにスエリング比5
5%未満のポリオレフィンを用いて種々の絶縁電線を製
造し、絶縁体の発泡度及び緒特性を調べ、その結果を各
表に明示しである。それによると、例えば参考例1の表
から明らかなように、スエリング比55%未満のしDP
巳の気泡径は55%以上のLDPHのそれに比べて2倍
以上と相当差があり、スエリング比55%未満のLDP
Eでは導体との密着及び外観が不良であると記されてい
る。また、参考例2の表中では、発泡度55%未満のブ
レンド樹脂体は55%以上の樹脂体に比較して気泡径が
2倍以上と大きく、導体との密着及び外観共に不良と決
定されている。The above publication lists low density polyethylene (LDPE), high density polyethylene (HDPE), polypropylene, etc. as polyolefins with a swelling ratio of 55% or more, and provides reference examples of these polyolefins and polyolefins with a swelling ratio of 55% or more.
Various insulated wires were manufactured using less than 5% polyolefin, and the degree of foaming and properties of the insulators were investigated, and the results are clearly shown in the tables. According to this, for example, as is clear from the table of Reference Example 1, DP with a swelling ratio of less than 55%
The bubble diameter of the Snake is more than twice that of the LDPH with a swelling ratio of 55% or more, and there is a considerable difference in the bubble diameter of the LDPH with a swelling ratio of less than 55%.
In E, it is written that the adhesion to the conductor and the appearance are poor. In addition, in the table of Reference Example 2, the blend resin body with a foaming degree of less than 55% has a bubble diameter that is more than twice as large as that of a resin body with a foaming degree of 55% or more, and is determined to be poor in terms of adhesion to the conductor and appearance. ing.
さらに、これらの結果を踏まえた上で、スエリング比5
5%未満のポリオレフィンは高発泡ポリオレフィン絶縁
電線には実用向きではないと確定している。Furthermore, based on these results, the swelling ratio of 5
It has been determined that less than 5% polyolefin is not practical for highly expanded polyolefin insulated wire.
従って本発明の目的は、以上の点を鑑みて、スエリング
比55%未満のポリオレフィンでも、発泡度55%以上
の発泡絶縁体を有する高発泡ポリオレフィン絶縁電線に
使用できる新規な技術を提供することにある。Therefore, in view of the above points, an object of the present invention is to provide a new technology that can be used for highly foamed polyolefin insulated wires having a foamed insulator with a degree of foaming of 55% or more even when polyolefin has a swelling ratio of less than 55%. be.
前記目的を達成するために、本発明者らは鋭意研究に努
めた結果、スエリング比55%未満のポリオレフィン1
00重量部と、分解温度150〜170℃の発泡剤0.
2〜2重量部と、分解温度190〜220℃の発泡剤0
.2〜2乗量部とからなる発泡性組成物であれば、少な
くとも発泡度55%以上の高発泡絶縁体が得られ、導体
との密着性や外観も良好で高発泡ポリオレフィン絶縁電
線として実用化できることを見出し、本発明を充放する
に至った。In order to achieve the above object, the present inventors made extensive research efforts and found that polyolefin 1 with a swelling ratio of less than 55%
00 parts by weight and a blowing agent with a decomposition temperature of 150 to 170°C.
2 to 2 parts by weight and 0 blowing agent with a decomposition temperature of 190 to 220°C
.. If the foamable composition is made of 2 to 2 parts, a highly foamed insulator with a degree of foaming of at least 55% or more can be obtained, and the adhesion to the conductor and appearance are also good, and it can be put to practical use as a highly foamed polyolefin insulated wire. They discovered what they could do and developed the present invention.
即ち、本発明はスエリング比55%未満のポリオレフィ
ン100重量部と、分解温度150〜170℃の発泡剤
0.2〜2重量部と、分解温度190〜220℃の発泡
剤0.2〜2重量部とからなることを特徴とする発泡性
組成物である。That is, the present invention uses 100 parts by weight of a polyolefin with a swelling ratio of less than 55%, 0.2 to 2 parts by weight of a blowing agent with a decomposition temperature of 150 to 170°C, and 0.2 to 2 parts by weight of a blowing agent with a decomposition temperature of 190 to 220°C. A foamable composition comprising:
しかして、本発明において使用するポリオレフィンのス
エリング比は55%未満、好ましくは10〜53%程度
、特には20〜51%程度が好適である。ポリオレフィ
ンはスエリング比55%未満であれば特に制限はなく、
低密度ポリエチレン(LDPE)、高密度ポリエチレン
(HD、PE)、中密度ポリエチレン(MDPE)、ポ
リプロピレンなどが例示される。これらのポリオレフィ
ンの組成物中の配合割合は、一種または二種以上全部で
100重量部である。Therefore, the swelling ratio of the polyolefin used in the present invention is preferably less than 55%, preferably about 10 to 53%, particularly about 20 to 51%. There is no particular restriction on polyolefin as long as it has a swelling ratio of less than 55%.
Examples include low density polyethylene (LDPE), high density polyethylene (HD, PE), medium density polyethylene (MDPE), and polypropylene. The blending ratio of one or more of these polyolefins in the composition is 100 parts by weight in total.
発泡剤は分解温度150〜170℃と190〜220℃
のものを二種類用いる。前者の発泡剤において、分解温
度は150〜170’C,好ましくは152〜168℃
、特に好ましくは160℃程度であり、例えばP、P−
オキシビスベンゼンスルホニルヒドラジド(OBSH)
が挙げられる。The blowing agent has a decomposition temperature of 150-170℃ and 190-220℃
Two types of these are used. In the former blowing agent, the decomposition temperature is 150-170'C, preferably 152-168'C.
, particularly preferably about 160°C, for example, P, P-
Oxybisbenzenesulfonyl hydrazide (OBSH)
can be mentioned.
後者の発泡剤の分解温度は190〜220℃、好ましく
は192〜218℃1特に好ましくは205℃程度であ
り、例えばアゾジカルボンアミド(A0CA)が挙げら
れる。両党泡剤の配合割合はそれぞれ0.2〜2重景部
、好ましくは0.4〜1.61i量部、特に好ましくは
0.6〜1,4重囲部である。The decomposition temperature of the latter blowing agent is 190 to 220°C, preferably 192 to 218°C, particularly preferably about 205°C, such as azodicarbonamide (A0CA). The mixing ratio of both foaming agents is 0.2 to 2 parts, preferably 0.4 to 1.61 parts, particularly preferably 0.6 to 1.4 parts.
また、本発明の組成物は上記ポリオレフィンと二種の発
泡剤からなれば十分であるが、この他に添加剤としてプ
レートアウト防止剤(例えばシリカ)、酸化防止剤、銅
害防止剤などを配合してもよい。添加剤の配合割合は、
0.02〜1.0重囲部、好ましくは0.04〜0.5
重量部である。In addition, it is sufficient for the composition of the present invention to consist of the above-mentioned polyolefin and two types of blowing agents, but in addition, plate-out inhibitors (for example, silica), antioxidants, copper damage inhibitors, etc. may be added as additives. You may. The blending ratio of additives is
0.02 to 1.0 double wall, preferably 0.04 to 0.5
Parts by weight.
なお、上記発泡性組成物を用いて高発泡ポリオレフィン
絶縁電線を製造する方法に限定はなく、例えば導体心線
上に発泡絶縁層と非発泡層(シーズなど)を同時に押出
被覆することによって行えばよい。Note that there are no limitations to the method of producing a highly foamed polyolefin insulated wire using the above foamable composition, and for example, it may be carried out by simultaneously extrusion coating a foamed insulating layer and a non-foamed layer (seeds, etc.) onto a conductor core wire. .
(実施例)
以下、実施例をもって本発明をより詳細に説明するが、
これらは本発明を何ら限定するものではない。(Example) Hereinafter, the present invention will be explained in more detail with reference to Examples.
These do not limit the present invention in any way.
実施例1〜3・比較例1〜2
次に、スエリング比55%未満のポリオレフィンを用い
た本発明の発泡性組成物が良好な発泡均一性及び高発泡
度であることを実施例及び比較例によって明確にする。Examples 1 to 3/Comparative Examples 1 to 2 Next, Examples and Comparative Examples demonstrate that the foamable composition of the present invention using a polyolefin with a swelling ratio of less than 55% has good foaming uniformity and a high foaming degree. Clarify by.
表■に示す如きスエリング比及び配合割合を有するポリ
オレフィン並びに発泡剤からなる発泡性、vlI或物を
作製し、発泡均一性及び発泡度を調べ、その結果を表r
に示した。A foamable material made of a polyolefin and a blowing agent having the swelling ratio and blending ratio as shown in Table 1 was prepared, and the foaming uniformity and degree of foaming were examined, and the results are shown in Table R.
It was shown to.
但し、スエリング比:SR及び発泡度は前記式(a)、
(b)によって求めた。However, the swelling ratio: SR and degree of foaming are expressed by the above formula (a),
(b).
また、参考例としてスエリング比60%のポリオレフィ
ンを用いた組成物の特性も併記した。In addition, as a reference example, the characteristics of a composition using a polyolefin with a swelling ratio of 60% are also listed.
(以下余白)
〔発明の効果〕
以上説明したように、本発明の発泡性&ll威物は、ス
エリング比55%未満のポリオレフィン100重量部と
、分解温度150〜170℃の発泡剤0.2〜2重量部
と、分解温度190〜220℃の発泡剤0.2〜2重量
部とからなることにより、従来は高発泡ポリオレフィン
絶縁電線に実用的でないと見なされていたスエリング比
55%未満のポリオレフィンであっても、発泡度55%
以上の高発泡及び良好な発泡均一性を有する発泡絶縁体
が得られる。(The following is a blank space) [Effects of the Invention] As explained above, the foaming property of the present invention consists of 100 parts by weight of polyolefin with a swelling ratio of less than 55% and 0.2 to 0.2 parts of a blowing agent with a decomposition temperature of 150 to 170°C. 2 parts by weight and 0.2 to 2 parts by weight of a blowing agent with a decomposition temperature of 190 to 220°C, the polyolefin has a swelling ratio of less than 55%, which was previously considered to be impractical for highly foamed polyolefin insulated wires. Even if the foaming degree is 55%
A foamed insulator having the above-described high foaming and good foaming uniformity can be obtained.
従って、高発泡ポリオレフィン絶縁電線に用いる材料の
選択幅が広くなり、当該電線における技術の豊富化に貢
献するところが大きい。Therefore, the selection range of materials used for highly foamed polyolefin insulated wires is widened, which greatly contributes to enriching the technology for the wires.
Claims (1)
部と、分解温度150〜170℃の発泡剤0.2〜2重
量部と、分解温度190〜220℃の発泡剤0.2〜2
重量部とからなることを特徴とする発泡性組成物。100 parts by weight of a polyolefin with a swelling ratio of less than 55%, 0.2 to 2 parts by weight of a blowing agent with a decomposition temperature of 150 to 170°C, and 0.2 to 2 parts of a blowing agent with a decomposition temperature of 190 to 220°C.
A foamable composition comprising parts by weight.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21677789A JPH0379641A (en) | 1989-08-23 | 1989-08-23 | Expandable composition |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21677789A JPH0379641A (en) | 1989-08-23 | 1989-08-23 | Expandable composition |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0379641A true JPH0379641A (en) | 1991-04-04 |
Family
ID=16693732
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21677789A Pending JPH0379641A (en) | 1989-08-23 | 1989-08-23 | Expandable composition |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0379641A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010207066A (en) * | 2009-01-23 | 2010-09-16 | Yunzhao Liu | In-vehicle multi-use charging device, and method of charging the same |
-
1989
- 1989-08-23 JP JP21677789A patent/JPH0379641A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010207066A (en) * | 2009-01-23 | 2010-09-16 | Yunzhao Liu | In-vehicle multi-use charging device, and method of charging the same |
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