JP2522966B2 - Polyethylene composition - Google Patents
Polyethylene compositionInfo
- Publication number
- JP2522966B2 JP2522966B2 JP62257952A JP25795287A JP2522966B2 JP 2522966 B2 JP2522966 B2 JP 2522966B2 JP 62257952 A JP62257952 A JP 62257952A JP 25795287 A JP25795287 A JP 25795287A JP 2522966 B2 JP2522966 B2 JP 2522966B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- parts
- amount
- polyethylene composition
- composition
- 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 - Lifetime
Links
Description
【発明の詳細な説明】 〈産業上の利用分野〉 本発明は、酸化劣化防止剤の添加によるブルームの発
生を抑制したポリエチレン組成物に関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a polyethylene composition in which bloom generation due to the addition of an antioxidant is suppressed.
〈従来の技術〉 架橋ポリエチレン（以下、XLPEと略記する）では、酸
化劣化の防止は勿論のこと、例えば押出し中のスコーチ
（早期加硫）を防ぐためもあって、一般に、酸化劣化防
止剤が添加される。<Prior Art> Cross-linked polyethylene (hereinafter abbreviated as XLPE) not only prevents oxidative deterioration but also, for example, to prevent scorch (premature vulcanization) during extrusion. Is added.
〈発明が解決しようとする問題点〉 ところが、この酸化劣化の防止効果を十分得るために
は、ある程度の酸化劣化防止剤を添加する必要がある一
方で、この添加量が多くなると（ポリエチレンの飽和溶
解量を越えるようになると）、ペレットのまま長期間保
管しておいた場合、ペレット表面に酸化劣化防止剤がブ
ルームとして滲み出したり、あるいはペレットにブルー
ムとして滲み出さないまでも、XLPE組成物をテープ状等
に加工した場合、体積に比べて表面積が大きくなるの
で、やはり酸化劣化防止剤がブルームとして滲み出して
くるという問題があった。<Problems to be Solved by the Invention> However, in order to sufficiently obtain the effect of preventing the oxidative deterioration, it is necessary to add a certain amount of the oxidative deterioration inhibitor, but when the amount of addition is large (saturation of polyethylene is If the amount exceeds the dissolution amount), if the pellets are stored for a long period of time, the XLPE composition will not be exuded as blooms on the pellet surface, or even if they do not exude as blooms on the pellets. When processed into a tape or the like, the surface area becomes larger than the volume, so that there is also a problem that the oxidative deterioration inhibitor oozes out as a bloom.
このようなブルームし易い組成物からなるテープを、
例えば、電力ケーブルの接続部の絶縁体として使用する
場合、電気特性の低下等は勿論のこと、テープ巻き工程
の作業性の低下を招来する等の問題も生じる。A tape made of such a composition that easily blooms,
For example, when it is used as an insulator of a connection portion of a power cable, not only the electric characteristics are deteriorated, but also the workability of the tape winding process is deteriorated.
そこで、本発明者等は、所望量の酸化劣化防止剤の添
加を行っても、弊害のないポリエチレン組成物につい
て、鋭意検討したところ、酸化劣化防止剤と、特定密度
の超低密度ポリエチレン（以下、VLDPEと略記する）お
よび低密度ポリエチレン（以下、LDPEと略記する）とを
併用することにより、ブルームの発生を効果的に抑制で
きることを見出した。Therefore, the inventors of the present invention have made earnest studies on a polyethylene composition having no adverse effect even if a desired amount of antioxidant is added, and as a result, the antioxidant and the specific density ultra-low density polyethylene (hereinafter , VLDPE) and low density polyethylene (hereinafter abbreviated as LDPE) in combination, it was found that the occurrence of bloom can be effectively suppressed.
本発明は、このような観点に立ってなされたものであ
る。The present invention has been made from such a viewpoint.
〈問題点を解決するための手段及びその作用〉 かゝる本発明の特徴とする点は、密度0.88〜0.91g/cm
3未満のVLDPE5〜50重量部未満と、密度0.91〜0.94g/cm3
のLDPE95〜50を越える重量部と、酸化劣化防止剤0.1〜
0.4重量部と、ジクミルパーオキサイド（以下、DCPと略
記する）1.0〜3.0重量部とからなるポリエチレン組成物
にある。<Means for Solving Problems and Its Action> The characteristic point of the present invention is that the density is 0.88 to 0.91 g / cm 3.
VLDPE less than 3 5 to less than 50 parts by weight and density 0.91 to 0.94 g / cm 3.
LDPE 95 to 50 parts by weight and oxidative deterioration inhibitor 0.1 to
A polyethylene composition comprising 0.4 parts by weight and 1.0 to 3.0 parts by weight of dicumyl peroxide (hereinafter abbreviated as DCP).
具体的な配合にあたっては、VLDPEとLDPEの所望量を
合計100重量部になるようにブレンドした後、酸化劣化
防止剤を配合して混和物を作り、この混和物にDCPを添
加する。In concrete blending, VLDPE and LDPE are blended so that the desired amount becomes 100 parts by weight in total, and then an antioxidant is blended to make a blend, and DCP is added to this blend.
この配合により、十分な架橋度と老化特性があると同
時に、ブルームの発生のないポリエチレン組成物を得る
ことができる。その理由としては、VLDPEは非晶部分が
多く、この非晶部分に酸化劣化防止剤が溶け込むからと
考えられる。By this blending, it is possible to obtain a polyethylene composition which has a sufficient degree of cross-linking and aging properties and at the same time has no bloom. The reason for this is considered that VLDPE has a large amount of amorphous portion, and the oxidative deterioration inhibitor dissolves in this amorphous portion.
このような本発明で用いるVLDPEの配合部数を、５〜5
0重量部未満としたのは、５重量部未満ではブルームが
生じ、50重量部を越えるようになると組成物の機械的特
性、特に引張り強度が弱くなるからである。Such VLDPE used in the present invention, the compounding part number is 5 to 5
The reason why the amount is less than 0 parts by weight is that bloom occurs when the amount is less than 5 parts by weight, and the mechanical properties of the composition, particularly the tensile strength, deteriorates when the amount exceeds 50 parts by weight.
また、本発明で用いるLDPEの配合部数を、95〜50を越
える重量部としたのは、上述のようにVLDPEとの合計重
量部数が100重量部となるようにするためである。The LDPE used in the present invention has a blending part weight of more than 95 to 50 because the total weight of VLDPE is 100 parts by weight as described above.
また、本発明で使用する酸化劣化防止剤としては、4,
4′−チオビス−（６−ターシャリー−ブチル−３−メ
チルフェノール）（以下、4,4′−チオビスと略記す
る）、ビス［２−メチル−４−｛３−ｎ−アルキル（C
12またはC14）チオプロピオニルオキシ｝−５−ターシ
ャリー−ブチルフェニル］スルフィド等が挙げられる。
そして、その配合部数を、0.1〜0.4重量部としたのは、
0.1重量部未満では少な過ぎて老化特性が悪く、また0.4
重量部を越えるとブルームが生じるようになるからであ
る。Further, as the oxidation deterioration inhibitor used in the present invention, 4,
4'-thiobis- (6-tert-butyl-3-methylphenol) (hereinafter abbreviated as 4,4'-thiobis), bis [2-methyl-4- {3-n-alkyl (C
12 or C 14 ) thiopropionyloxy} -5-tert-butylphenyl] sulfide and the like.
And, the mixing part number, 0.1-0.4 parts by weight,
If the amount is less than 0.1 parts by weight, the amount is too small and the aging property is poor, and 0.4
This is because blooming occurs when the amount exceeds the weight part.
また、本発明で使用するDCPの配合部数を、1.0〜3.0
重量部としたのは、1.0重量部未満では所望の十分な架
橋度が得られず、3.0重量部を越えるとスコーチが発生
するようになるからである。Further, the number of parts of DCP used in the present invention is 1.0 to 3.0.
The reason why the amount is less than 1.0 part by weight is that the desired sufficient degree of crosslinking cannot be obtained, and if it exceeds 3.0 parts by weight, scorch is generated.
〈実施例〉 第１表に示した配合組成による実施例〜と、比較
例〜の各ポリエチレン組成物を作り、各組成物の架
橋度（ゲル分率）、熱老化試験による熱老化特性、ブル
ーム性を調べたところ、その結果は、第１表併記の如く
であった。<Example> Each polyethylene composition of Examples ~ and Comparative Examples ~ having the composition shown in Table 1 was prepared, and the degree of crosslinking (gel fraction) of each composition, heat aging characteristics by heat aging test, and bloom. When the sex was examined, the results were as shown in Table 1 together.
なお、熱老化試験は、160℃で120時間加熱して行い、
その判定は伸び残率が50％以上を合格とし、特に、◎は
余裕を持っての合格を、○は通常の合格を示し、×は不
合格を示してある。The heat aging test is performed by heating at 160 ° C for 120 hours,
The judgment is that the residual elongation rate is 50% or more, and in particular, ◎ indicates a pass with a margin, ○ indicates a normal pass, and × indicates a fail.
上記第１表から、架橋度は、すべての各例（実施例
〜、比較例〜）で十分な値が得られるが、熱老化
特性においては、本実施例〜にあってはすべて合格
であるのに対して、比較例では不合格となり、また、
ブルームの発生は、本実施例〜では全く認められな
いのに対して、酸化劣化防止剤（4,4′−チオビス）が
0.1以上である比較例〜では発生が認められた。 From Table 1 above, a sufficient degree of crosslinking can be obtained in all of the examples (Examples ~, Comparative Examples ~), but the heat aging characteristics are all acceptable in this Example ~. On the other hand, in the comparative example, it fails, and also
The generation of bloom is not observed at all in the present Examples to, while the oxidative deterioration inhibitor (4,4′-thiobis) is
Occurrence was observed in Comparative Examples 1 to 0.1 and above.
〈発明の効果〉 以上の説明から明らかなように本発明にそれば、酸化
劣化防止剤を通常用いる所定量添加しても、ブルームの
発生がなく、十分な架橋度と、従来と同様か、あるいは
それ以上の老化特性を有する優れたポリエチレン組成物
を提供することができる。勿論、この組成物からなるテ
ープを、例えば電力ケーブルの接続部の絶縁体として用
いれば、作業性の向上を図ることができる。<Effects of the Invention> As apparent from the above description, according to the present invention, even if a predetermined amount of an antioxidant is added, bloom does not occur, and a sufficient degree of crosslinking is the same as the conventional one. Alternatively, it is possible to provide an excellent polyethylene composition having further aging characteristics. Needless to say, if a tape made of this composition is used as an insulator of the connection portion of a power cable, workability can be improved.
フロントページの続き (56)参考文献 特開 平１−98644（ＪＰ，Ａ) 特開 昭63−205340（ＪＰ，Ａ) 特開 昭63−210150（ＪＰ，Ａ)Continuation of front page (56) Reference JP-A-1-98644 (JP, A) JP-A-63-205340 (JP, A) JP-A-63-210150 (JP, A)
Claims (1)
エチレン５〜50重量部未満と、密度0.91〜0.94g/cm3の
低密度ポリエチレン95〜50を越える重量部と、酸化劣化
防止剤0.1〜0.4重量部と、ジクミルパーオキサイド1.0
〜3.0重量部とからなるポリエチレン組成物。1. Ultra-low density polyethylene having a density of 0.88 to less than 0.91 g / cm 3 and less than 5 to 50 parts by weight, low density polyethylene having a density of 0.91 to 0.94 g / cm 3 and more than 95 to 50 parts by weight, and oxidative deterioration 0.1-0.4 parts by weight of inhibitor and 1.0 of dicumyl peroxide
A polyethylene composition consisting of ~ 3.0 parts by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62257952A JP2522966B2 (en) | 1987-10-13 | 1987-10-13 | Polyethylene composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62257952A JP2522966B2 (en) | 1987-10-13 | 1987-10-13 | Polyethylene composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0198643A JPH0198643A (en) | 1989-04-17 |
| JP2522966B2 true JP2522966B2 (en) | 1996-08-07 |
Family
ID=17313496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62257952A Expired - Lifetime JP2522966B2 (en) | 1987-10-13 | 1987-10-13 | Polyethylene composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2522966B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI224607B (en) | 1998-06-16 | 2004-12-01 | Union Carbide Chem Plastic | Tree resistant cable |
| JP4853713B2 (en) * | 2007-01-18 | 2012-01-11 | 株式会社ジェイ・エム・エス | Medical bag mount |
| BR112016013554B1 (en) * | 2013-12-19 | 2021-09-14 | Borealis Ag | POLYMERIC COMPOSITION, RETICULATED POLYMERIC COMPOSITION, ITS USES, INSULATION FOR POWER CORDS, POWER CORD AND METHOD TO OBTAIN LOW ELECTRICAL CONDUCTIVITY OF A RETICULATED POLYMER COMPOSITION |
| US10347390B2 (en) * | 2013-12-19 | 2019-07-09 | Borealis Ag | Polymer composition, power cable insulation and power cable |
| MX2016007940A (en) * | 2013-12-19 | 2016-09-19 | Borealis Ag | A new crosslinked polymer composition, power cable insulation and power cable. |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0819289B2 (en) * | 1987-02-25 | 1996-02-28 | 三菱電線工業株式会社 | Resin composition for power cable coating |
-
1987
- 1987-10-13 JP JP62257952A patent/JP2522966B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0198643A (en) | 1989-04-17 |
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