JPS6135434B2 - - Google Patents
Info
- Publication number
- JPS6135434B2 JPS6135434B2 JP53070244A JP7024478A JPS6135434B2 JP S6135434 B2 JPS6135434 B2 JP S6135434B2 JP 53070244 A JP53070244 A JP 53070244A JP 7024478 A JP7024478 A JP 7024478A JP S6135434 B2 JPS6135434 B2 JP S6135434B2
- Authority
- JP
- Japan
- Prior art keywords
- plasticizer
- heat
- absorbing layer
- ethylene
- shrinkable tube
- 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
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 12
- -1 polyethylene, ethylene-propylene copolymer Polymers 0.000 claims description 12
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 10
- 239000004698 Polyethylene Substances 0.000 claims description 9
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 claims description 9
- 229920000573 polyethylene Polymers 0.000 claims description 8
- 239000011256 inorganic filler Substances 0.000 claims description 3
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 3
- 239000004014 plasticizer Substances 0.000 description 10
- 229920000915 polyvinyl chloride Polymers 0.000 description 8
- 239000004800 polyvinyl chloride Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 229920001577 copolymer Polymers 0.000 description 5
- 239000005042 ethylene-ethyl acrylate Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000000740 bleeding effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 description 1
- 229920006226 ethylene-acrylic acid Polymers 0.000 description 1
- 229920006225 ethylene-methyl acrylate Polymers 0.000 description 1
- 229920005680 ethylene-methyl methacrylate copolymer Polymers 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Description
熱収縮チユーブは熱により復元する性質を利用
して、電力、通信用ケーブルの接続用やガス、石
油等のパイプラインの防水用、防食用、保護用、
電気絶縁用として広く利用されている。
本発明はこのうちPVC（ポリ塩化ビニル）外
被を有するケーブルやPVCを保護被覆として使
用する管状体や機械等の機材の接続部用、被覆用
等に適用する熱収縮チユーブに関するものであ
る。
さてPVCは一般に可塑剤を含んでおり、通常
のポリエチレンによる熱収縮チユーブを使用した
場合、高温に放置しておくと熱収縮チユーブの表
面にPVC外被からの可塑剤がブリード（析出）
して表面がべとべとになる欠点があつた。
このため例えばポリエチレンの熱収縮チユーブ
層にEVA（エチレン−酢酸ビニル共重合体）や
EVA（エチレン−エチルアクリレート共重合
体）等の共重合体をブレンドしたり、エロジル、
カーボン等の無機充填剤を入れる方法がとられて
きた。しかしこれらの方法にも下記の様な欠点が
〓〓〓〓〓
あつた。
ポリエチレン単独タイプ（少量のカーボンを
含む場合あり）…可塑剤がチユーブ表面にブリ
ードする。
ポリエチレンとEVA又はEEAのブレンドタ
イプ或いはEVA、EEA単独タイプ（少量のカ
ーボンを含む場合あり）…可塑剤ブリードはと
まるが一般にチユーブを加熱収縮させる場合、
トーチランプ等を使用するためチユーブ表面温
度があがりEVAが分解して表面がアバタ状に
なりひどい時には亀裂が発生する。
ポリエチレンとカーボンのブレンドタイプ…
可塑剤のブリードをとめる場合はベースに対し
10部以上のカーボン添加を必要としチユーブが
かたくなる。
本発明は上記問題点に鑑みなされたもので第１
図はその実施例である。
第１図において１はポリエチレン又はエチレン
−プロピレン共重合体（EPDM）又はそれらのブ
レンド体を主体とした熱収縮チユーブで通常は電
子線、放射線、化学架橋等で架橋される。２は可
塑剤吸収層でエチレン−酢酸ビニル共重合体
（EVA）、エチレン−エチルアクリレート共重合
体（EEA）、あるいはこれらとポリエチレンのブ
レンド体、あるいはエロジルとのブレンド体、あ
るいは無機充填剤とのブレンド体などが材料とし
て用いられる。
又この他エチレン−メチルアクリレート共重合
体、エチレン−メチルメタアクリレート共重合
体、エチレン−酢酸ビニル共重合体鹸化物、エチ
レン−アクリル酸共重合体、エチレン−アクリル
酸金属塩共重合体、エチレン−グリシジルメタク
リレート共重合体、エチレン−酢酸ビニル−グリ
シジルメタクリレート共重合体を使用してもよ
い。
なお熱収縮チユーブと可塑剤吸収層はくつつい
ていても分離できるようになつていてもいずれで
もよい。
又可塑剤吸収層の内側に熱収縮チユーブを熱収
縮させた時PVC外被との接着性を良くするた
め、ポリアミド系、EEA系、アスフアルト系な
どの一般の接着剤の層を設けることもできる。又
この接着剤をPVC外被上にほどこしてから本発
明の可塑剤吸収層付き熱収縮チユーブをその上に
加熱収縮させて使用することもできる。
又可塑剤吸収層の内側に熱収縮チユーブと同じ
材料の層を設け可塑剤吸収層を熱収縮チユーブで
はさんだサンドイツチ構造とすることもできる。
次に本発明の実施例と比較例を示す。第１表は
熱収縮チユーブの材料及び可塑剤吸収層の材料を
かえて１mm厚さの可塑剤吸収層付きあるいは無し
の熱収縮チユーブを試作し、PVC外被上に熱収
縮させて100℃の熱風オープン中に７日間放置し
て可塑剤がブリードしてくる状況を調べたもので
ある。
Heat-shrinkable tubes take advantage of their property of being restored by heat, and can be used for connecting power and communication cables, as well as for waterproofing, corrosion prevention, and protection of gas and oil pipelines.
Widely used for electrical insulation. The present invention relates to a heat-shrinkable tube that is used for connecting or covering cables having a PVC (polyvinyl chloride) jacket, tubular bodies, machines, and other equipment that use PVC as a protective covering. Now, PVC generally contains a plasticizer, and if you use a heat-shrinkable tube made of ordinary polyethylene and leave it at high temperatures, the plasticizer from the PVC jacket will bleed (precipitate) on the surface of the heat-shrinkable tube.
The problem was that the surface became sticky. For this reason, for example, EVA (ethylene-vinyl acetate copolymer) is used in the polyethylene heat-shrinkable tube layer.
Blending copolymers such as EVA (ethylene-ethyl acrylate copolymer), Erosil,
A method of adding inorganic fillers such as carbon has been adopted. However, these methods also have the following drawbacks:
It was hot. Single polyethylene type (may contain a small amount of carbon)...Plasticizer bleeds onto the tube surface. A blend type of polyethylene and EVA or EEA, or a single type of EVA or EEA (may contain a small amount of carbon)...Plasticizer bleed is stopped, but generally when the tube is heated and shrunk,
Since the tube surface temperature rises due to the use of a torch lamp, etc., the EVA decomposes, causing the surface to become avatar-like and, in severe cases, cracks. Blend type of polyethylene and carbon...
To stop the plasticizer from bleeding, apply it to the base.
It requires adding 10 parts or more of carbon and the tube becomes hard. The present invention has been made in view of the above problems, and is the first invention.
The figure is an example. In FIG. 1, numeral 1 is a heat-shrinkable tube mainly made of polyethylene, ethylene-propylene copolymer (EPDM), or a blend thereof, which is usually crosslinked by electron beam, radiation, chemical crosslinking, or the like. 2 is a plasticizer absorption layer made of ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), a blend of these and polyethylene, a blend of Erosil, or an inorganic filler. A blend or the like is used as the material. In addition, ethylene-methyl acrylate copolymer, ethylene-methyl methacrylate copolymer, saponified ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-acrylic acid metal salt copolymer, ethylene- Glycidyl methacrylate copolymers and ethylene-vinyl acetate-glycidyl methacrylate copolymers may also be used. Note that the heat-shrinkable tube and the plasticizer absorbing layer may be attached together or may be separated. In addition, a layer of general adhesive such as polyamide, EEA, asphalt, etc. can be provided inside the plasticizer absorption layer to improve adhesion to the PVC jacket when the heat-shrinkable tube is heat-shrinked. . It is also possible to use this adhesive by applying the adhesive onto the PVC jacket and then heat-shrinking the heat-shrinkable tube with a plasticizer-absorbing layer of the present invention thereon. Alternatively, a layer made of the same material as the heat-shrinkable tube may be provided inside the plasticizer-absorbing layer to form a sandwich structure in which the plasticizer-absorbing layer is sandwiched between the heat-shrinkable tubes. Next, examples of the present invention and comparative examples will be shown. Table 1 shows that heat-shrink tubes with or without a 1 mm thick plasticizer-absorbing layer were prototyped by changing the materials of the heat-shrink tube and the material of the plasticizer-absorbing layer. This study investigated the situation in which the plasticizer bleeds out after being left open for 7 days with hot air.
【表】
〓〓〓〓〓
[Table] 〓〓〓〓〓
【表】【table】
【表】
以上述べたように本発明の可塑剤吸収層付き熱
収縮チユーブはPVC外被上に使用しても従来の
熱収縮チユーブに比べ、ブリードの発生がほとん
どなくなるので熱収縮チユーブの表面がべとべと
することがなく、又表面の熱収縮チユーブは熱安
定性のよいポリエチレンあるいはエチレン−プロ
ピレン共重合体で構成しうるため加熱時のトーチ
ランプの炎によつても表面があれないという利点
を有する。[Table] As mentioned above, even when the heat-shrinkable tube with a plasticizer absorption layer of the present invention is used on a PVC jacket, there is almost no bleeding compared to the conventional heat-shrinkable tube, so the surface of the heat-shrinkable tube is It does not become sticky, and since the heat-shrinkable tube on the surface can be made of polyethylene or ethylene-propylene copolymer, which has good heat stability, it has the advantage that the surface will not be damaged by the flame of a torch lamp during heating. .
第１図は本発明の可塑剤吸収層付き熱収縮チユ
ーブの実施例で１は熱収縮チユーブ、２は可塑剤
吸収層を示す。
〓〓〓〓〓
FIG. 1 shows an example of a heat-shrinkable tube with a plasticizer-absorbing layer according to the present invention, where 1 shows the heat-shrinkable tube and 2 shows the plasticizer-absorbing layer. 〓〓〓〓〓
Claims (1)
合体又はそれらのブレンド体を主成分とする熱収
縮チユーブの内側に可塑剤吸収層を設けたことを
特徴とする可塑剤吸収層付き熱収縮チユーブ。 ２ 可塑剤吸収層がエチレン−酢酸ビニル共重合
体又はこれとポリエチレンのブレンド体からなる
特許請求の範囲第１項記載の可塑剤吸収層付き熱
収縮チユーブ。 ３ 可塑剤吸収層がエチレン−エチルアクリレー
ト共重合体又はこれとポリエチレンのブレンド体
からなる特許請求の範囲第１項記載の可塑剤吸収
層付き熱収縮チユーブ。 ４ 可塑剤吸収層がポリエチレン、エチレン−酢
酸ビニル共重合体又はエチレン−エチルアクリレ
ート共重合体とエロジルとのブレンド体からなる
特許請求の範囲第１項記載の可塑剤吸収層付き熱
収縮チユーブ。 ５ 可塑剤吸収層がポリエチレン、エチレン−酢
酸ビニル共重合体又はエチレン−エチルアクリレ
ート共重合体と無機充填剤とからなる特許請求の
範囲第１項記載の可塑剤吸収層付き熱収縮チユー
ブ。[Scope of Claims] 1. A heat-shrinkable tube with a plasticizer-absorbing layer, characterized in that a plasticizer-absorbing layer is provided inside a heat-shrinkable tube mainly composed of polyethylene, ethylene-propylene copolymer, or a blend thereof. Tube. 2. The heat-shrinkable tube with a plasticizer-absorbing layer according to claim 1, wherein the plasticizer-absorbing layer is made of an ethylene-vinyl acetate copolymer or a blend of this and polyethylene. 3. The heat-shrinkable tube with a plasticizer-absorbing layer according to claim 1, wherein the plasticizer-absorbing layer is made of an ethylene-ethyl acrylate copolymer or a blend of this and polyethylene. 4. The heat-shrinkable tube with a plasticizer-absorbing layer according to claim 1, wherein the plasticizer-absorbing layer is made of a blend of polyethylene, ethylene-vinyl acetate copolymer, or ethylene-ethyl acrylate copolymer and Erosil. 5. The heat-shrinkable tube with a plasticizer-absorbing layer according to claim 1, wherein the plasticizer-absorbing layer comprises polyethylene, ethylene-vinyl acetate copolymer, or ethylene-ethyl acrylate copolymer and an inorganic filler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7024478A JPS54161111A (en) | 1978-06-10 | 1978-06-10 | Machine member covered with thermo-shrinking tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7024478A JPS54161111A (en) | 1978-06-10 | 1978-06-10 | Machine member covered with thermo-shrinking tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54161111A JPS54161111A (en) | 1979-12-20 |
| JPS6135434B2 true JPS6135434B2 (en) | 1986-08-13 |
Family
ID=13425953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7024478A Granted JPS54161111A (en) | 1978-06-10 | 1978-06-10 | Machine member covered with thermo-shrinking tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54161111A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61218320A (en) * | 1985-12-14 | 1986-09-27 | 住友電気工業株式会社 | Formation of protective layer for pvc sheath |
| JP2742579B2 (en) * | 1986-02-01 | 1998-04-22 | 臼井国際産業 株式会社 | Flexible composite hose |
| JPH0611513B2 (en) * | 1986-04-18 | 1994-02-16 | 豊田合成株式会社 | Manufacturing method of reinforced rubber hose |
| JP6002027B2 (en) * | 2012-12-20 | 2016-10-05 | 住友電気工業株式会社 | Multi-layer heat recovery article, wire splice and wire harness |
| JP5651161B2 (en) | 2012-12-20 | 2015-01-07 | 住友電気工業株式会社 | Multi-layer heat recovery article, wire splice and wire harness |
| CN103489518A (en) * | 2013-08-27 | 2014-01-01 | 江苏鑫丰塑业有限公司 | Thermal contraction low smoke flame-retardant cable |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2840067A (en) * | 1954-09-23 | 1958-06-24 | Hoffman Electronics Corp | Glow plug ignition systems or the like |
| DE1426173A1 (en) * | 1962-02-12 | 1969-01-23 | Bern Werk Albert Ruprecht | Control of the electrical power of heating elements, e.g. of glow plugs |
| JPS4850194A (en) * | 1971-10-27 | 1973-07-14 | ||
| JPS491924A (en) * | 1972-04-24 | 1974-01-09 |
-
1978
- 1978-06-10 JP JP7024478A patent/JPS54161111A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2840067A (en) * | 1954-09-23 | 1958-06-24 | Hoffman Electronics Corp | Glow plug ignition systems or the like |
| DE1426173A1 (en) * | 1962-02-12 | 1969-01-23 | Bern Werk Albert Ruprecht | Control of the electrical power of heating elements, e.g. of glow plugs |
| JPS4850194A (en) * | 1971-10-27 | 1973-07-14 | ||
| JPS491924A (en) * | 1972-04-24 | 1974-01-09 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54161111A (en) | 1979-12-20 |
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