JPS5946264B2 - Water resistant electrical insulation - Google Patents
Water resistant electrical insulationInfo
- Publication number
- JPS5946264B2 JPS5946264B2 JP12214775A JP12214775A JPS5946264B2 JP S5946264 B2 JPS5946264 B2 JP S5946264B2 JP 12214775 A JP12214775 A JP 12214775A JP 12214775 A JP12214775 A JP 12214775A JP S5946264 B2 JPS5946264 B2 JP S5946264B2
- Authority
- JP
- Japan
- Prior art keywords
- aging agent
- water
- room temperature
- temperature
- liquid
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 13
- 238000010292 electrical insulation Methods 0.000 title 1
- 230000003712 anti-aging effect Effects 0.000 claims description 24
- 239000003795 chemical substances by application Substances 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 16
- 230000003647 oxidation Effects 0.000 claims description 15
- 238000007254 oxidation reaction Methods 0.000 claims description 15
- 229920000098 polyolefin Polymers 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 6
- 230000004927 fusion Effects 0.000 claims description 4
- 239000000615 nonconductor Substances 0.000 claims description 3
- 238000004132 cross linking Methods 0.000 description 9
- 238000002844 melting Methods 0.000 description 9
- 230000008018 melting Effects 0.000 description 9
- -1 polyethylene Polymers 0.000 description 9
- 239000004698 Polyethylene Substances 0.000 description 8
- 229920000573 polyethylene Polymers 0.000 description 8
- 150000002978 peroxides Chemical class 0.000 description 7
- 239000012212 insulator Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 229920003020 cross-linked polyethylene Polymers 0.000 description 4
- 239000004703 cross-linked polyethylene Substances 0.000 description 4
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 240000005572 Syzygium cordatum Species 0.000 description 3
- 235000006650 Syzygium cordatum Nutrition 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 2
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 125000005591 trimellitate group Chemical group 0.000 description 2
- HVLLSGMXQDNUAL-UHFFFAOYSA-N triphenyl phosphite Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)OC1=CC=CC=C1 HVLLSGMXQDNUAL-UHFFFAOYSA-N 0.000 description 2
- YJTKZCDBKVTVBY-UHFFFAOYSA-N 1,3-Diphenylbenzene Chemical group C1=CC=CC=C1C1=CC=CC(C=2C=CC=CC=2)=C1 YJTKZCDBKVTVBY-UHFFFAOYSA-N 0.000 description 1
- DLMYHUARHITGIJ-UHFFFAOYSA-N 1-ethyl-2-phenylbenzene Chemical group CCC1=CC=CC=C1C1=CC=CC=C1 DLMYHUARHITGIJ-UHFFFAOYSA-N 0.000 description 1
- UMSGIWAAMHRVQI-UHFFFAOYSA-N 1-ethyl-4-(4-ethylphenyl)benzene Chemical group C1=CC(CC)=CC=C1C1=CC=C(CC)C=C1 UMSGIWAAMHRVQI-UHFFFAOYSA-N 0.000 description 1
- 125000003143 4-hydroxybenzyl group Chemical group [H]C([*])([H])C1=C([H])C([H])=C(O[H])C([H])=C1[H] 0.000 description 1
- CYYZDBDROVLTJU-UHFFFAOYSA-N 4-n-Butylphenol Chemical compound CCCCC1=CC=C(O)C=C1 CYYZDBDROVLTJU-UHFFFAOYSA-N 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 1
- 239000007983 Tris buffer Substances 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- GLOQRSIADGSLRX-UHFFFAOYSA-N decyl diphenyl phosphite Chemical compound C=1C=CC=CC=1OP(OCCCCCCCCCC)OC1=CC=CC=C1 GLOQRSIADGSLRX-UHFFFAOYSA-N 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000012975 dibutyltin dilaurate Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 235000020004 porter Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- MGMXGCZJYUCMGY-UHFFFAOYSA-N tris(4-nonylphenyl) phosphite Chemical compound C1=CC(CCCCCCCCC)=CC=C1OP(OC=1C=CC(CCCCCCCCC)=CC=1)OC1=CC=C(CCCCCCCCC)C=C1 MGMXGCZJYUCMGY-UHFFFAOYSA-N 0.000 description 1
- GRPURDFRFHUDSP-UHFFFAOYSA-N tris(prop-2-enyl) benzene-1,2,4-tricarboxylate Chemical compound C=CCOC(=O)C1=CC=C(C(=O)OCC=C)C(C(=O)OCC=C)=C1 GRPURDFRFHUDSP-UHFFFAOYSA-N 0.000 description 1
- QQBLOZGVRHAYGT-UHFFFAOYSA-N tris-decyl phosphite Chemical compound CCCCCCCCCCOP(OCCCCCCCCCC)OCCCCCCCCCC QQBLOZGVRHAYGT-UHFFFAOYSA-N 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Organic Insulating Materials (AREA)
Description
【発明の詳細な説明】
本発明は、耐水トリ−性の改良された電気絶縁体に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrical insulator with improved water resistance.
架橋ポリエチレンは、耐熱軟化性、耐溶剤性に優れてい
るうえに絶縁耐力も比較的大きいところからケーブル絶
縁体として多用されている。Cross-linked polyethylene is widely used as a cable insulator because it has excellent heat softening resistance and solvent resistance, and also has relatively high dielectric strength.
しかるにこの架橋ポリエチレン絶縁体は、水蒸気による
架橋や浸水環境下における使用等により、微量の水分が
侵入した場合、絶縁体中に、微小ボードや異物を中心に
して電界方向に伸びる蝶ネクタイ状の劣化痕跡（ポータ
ー、トリ−）すなわち水トリ−を生ずるという欠点があ
つた。この水トリ−は、ケーブル内に侵入した水とボー
ド、異物等による局所的高電界との相互作用により生ず
るものであつて、これが多数存在する場合には、ｔａｎ
δの上昇、ρの低下が起り、ついてはケーブルの絶縁破
壊をひき起すことも懸念される。However, when a small amount of moisture enters this cross-linked polyethylene insulator due to cross-linking with water vapor or use in a flooded environment, bow-tie-shaped deterioration occurs in the insulator, which extends in the direction of the electric field around small boards and foreign objects. It had the disadvantage of producing traces (porter, trie), or water trines. This water tree is caused by the interaction between water that has entered the cable and a localized high electric field caused by boards, foreign objects, etc. If there are many water trees, the tan
An increase in δ and a decrease in ρ occur, and there is a concern that this may cause dielectric breakdown of the cable.
本発明者等は、かかる水トリ−生成の機構を解明すべく
各種の架橋ポリオレフィン組成物における水トリ−の発
生傾向を調査したところ架橋ポリオレフィン組成物の融
解エントロピー、酸化温度とポーター、トリ−の発生数
との間に一定の関係があることを見出した。The present inventors investigated the tendency of water trines to occur in various crosslinked polyolefin compositions in order to elucidate the mechanism of such water trines formation. It was found that there is a certain relationship between the number of occurrences.
すなわち、架橋ポリオレフィン組成物を酸化温度の高い
組成のものとした場合、融解エントロピーがＯ、０５２
ｃａｌ／ ｙ、。That is, when the crosslinked polyolefin composition has a composition with a high oxidation temperature, the entropy of melting is O, 052
cal/y,.
に（昇温速度５℃／分）を越えると水トリ−の発生が急
激に増加し、また逆に融解エントロピーがＯ、０５２ｃ
ａｌ／を、、。に以下であつても酸化温度が低くなると
水トリ−の発生が急激に増加するのである。一般に融解
エントロピーは、ポリマーの非晶領域の分子鎖の剛性と
相関関係があり、架橋剤用過酸化物を多量に配合して架
橋度を増加させることにより減少する傾向を示す。(heating rate of 5°C/min), the generation of water trees increases rapidly, and conversely, the entropy of melting increases to O, 052c.
al/. Even if the oxidation temperature is below , the occurrence of water triplication increases rapidly as the oxidation temperature becomes lower. Generally, the melting entropy has a correlation with the rigidity of the molecular chains in the amorphous region of the polymer, and tends to be reduced by increasing the degree of crosslinking by incorporating a large amount of peroxide for a crosslinking agent.
しかしながら、この場合老化防止剤も架橋用過酸化物に
より多量に消費されるので、逆に酸化温度は低下する傾
向を示す。However, in this case, since a large amount of the anti-aging agent is also consumed by the crosslinking peroxide, the oxidation temperature tends to decrease.
したがつて融解エントロピーを減少させ併せて酸化温度
を上昇させるには架橋用過酸化物と老化防止剤を共に多
用に使用する必要があるが、一般に老化防止剤はポリエ
チレンとの相溶性に乏しいため、一時的に酸化温度が向
上しても逐次ブリードしてきて、特性が低下してしまう
という難点があつた。Therefore, in order to reduce the entropy of melting and increase the oxidation temperature, it is necessary to use a large amount of both a crosslinking peroxide and an anti-aging agent, but in general, anti-aging agents have poor compatibility with polyethylene. However, even if the oxidation temperature was temporarily increased, bleeding would occur one after another and the characteristics would deteriorate.
本発明者等はかかる難点を解消すべく更に研究をすすめ
たところ、常温で液状の老化防止剤を使用するかあるい
は老化防止剤と共に老化防止剤を溶解する絶縁性の液状
媒体を併用して、老化防止剤を常温度で液状又はペース
ト状となるよう調整して添加することによりオレフイン
系重合体に対する溶解性が向上し、酸化温度が著しく向
上することを見出した。The inventors of the present invention conducted further research in order to resolve these difficulties, and found that using an anti-aging agent that is liquid at room temperature or using an insulating liquid medium that dissolves the anti-aging agent together with the anti-aging agent. It has been found that by adjusting and adding an anti-aging agent so that it becomes liquid or paste at room temperature, the solubility of the olefin polymer can be improved and the oxidation temperature can be significantly improved.
本発明は、これらの知見に基いてなされたものであつて
、オレフイン系重合体１００部に対して、常温で液状又
はペースト状となるよう調整された老化防止剤０．５〜
４．０部好ましくは０．７〜３．５部と架橋用過酸化物
を添加した組成物を加熱架橋させて成る、融解エントロ
ピー０．０５２ｃａ１／ｆ、０Ｋ以下、酸化温度２３５
℃以上の架橋オレフイン系重合体から成る耐水トリ一性
電気絶縁体に関するものである。The present invention was made based on these findings, and includes 0.5 to 0.5 to 100 parts of an anti-aging agent adjusted to be liquid or paste-like at room temperature for 100 parts of the olefin polymer.
4.0 parts, preferably 0.7 to 3.5 parts, of a composition to which a crosslinking peroxide is added is thermally crosslinked, entropy of fusion 0.052 cal/f, 0K or less, oxidation temperature 235
The present invention relates to a water-resistant triuniform electrical insulator made of a crosslinked olefin polymer having a temperature of 0.degree. C. or higher.
本発明に使用されるオレフイン系重合体としては、ポリ
エチレン、特に密度０．９２３以下の高圧法ポリエチレ
ンが適している。As the olefinic polymer used in the present invention, polyethylene, particularly high-pressure polyethylene having a density of 0.923 or less, is suitable.
また、スチレン、シリコン等をグラフトして剛性を付与
したグラフト化ポリエチレンも好適している。Also suitable is grafted polyethylene which has been grafted with styrene, silicone or the like to impart rigidity.
このようなグラフト化ポリエチレンのグラフト化率は１
〜１０％程度、特に３〜８％程度が望ましい。本発明に
おいて、常温で液状又はペースト状となるように老化防
止剤を調整するには、常温で液状の老化防止剤にあつて
はそのまま使用できるが、結晶性粉末のような常温で固
体の老化防止剤の場合には、ほぼ同量の絶縁性の液状媒
体に溶解させて液状又はペースト状として使用する。The grafting rate of such grafted polyethylene is 1
About 10%, especially about 3 to 8% is desirable. In the present invention, in order to adjust the anti-aging agent so that it becomes liquid or paste-like at room temperature, an anti-aging agent that is liquid at room temperature can be used as it is, but an anti-aging agent that is solid at room temperature such as a crystalline powder can be used. In the case of an inhibitor, it is used in liquid or paste form by dissolving it in approximately the same amount of an insulating liquid medium.
なお、上記の液状媒体を予じめ老化防止剤と混合してお
く必要はなく、オレフイン系重合体に老化防止剤のみを
配合し、次いで液状媒体をオレフイン系重合体に吸収さ
せるような方法をとつてもよい。一般にポリオレフイン
系重合体例えばポリエチレンに対する常温で固体の老化
防止剤の溶解度は０，１％以下であるが、液状又はペー
スト状とすることにより４％程度まで向上させることが
可能である。本発明に使用される常温で固体の老化防止
剤としては、４・４′−チオビス−３−メチル−６−ｔ
一ブチルフエノール（ＴＢＰ）、３−（３・５−ジ一ｔ
ニブチル一４−ヒドロキシフエニル）プロピオネート（
ＢＨＰ）〔チバ、カーキー社製、商品名１ｒ？Ｎｅｘｌ
ＯｌＯ〕、修酸ビス（ベンジリデンハイドライド（０Ｈ
ＢＨ）、ジフエニルアミン（ＤＰＡ）、ジフエニル一Ｐ
−フエニレジアミン（ＤＰＰＤ）、ジアルキルフエノー
ルスルフイド、トリメチル−トリス（ジ一ｔ−ブチル−
４−ヒドロキシベンジル）ベンゼン等がある。Note that it is not necessary to mix the above liquid medium with an anti-aging agent in advance; instead, a method in which only the anti-aging agent is blended into the olefinic polymer and then the liquid medium is absorbed into the olefinic polymer can be used. Very good. Generally, the solubility of a solid anti-aging agent in a polyolefin polymer such as polyethylene is 0.1% or less at room temperature, but it can be improved to about 4% by forming it into a liquid or paste form. The anti-aging agent that is solid at room temperature used in the present invention includes 4,4'-thiobis-3-methyl-6-t
Monobutylphenol (TBP), 3-(3,5-di-t)
Nibutyl-4-hydroxyphenyl) propionate (
BHP) [Ciba, manufactured by Kirkey, product name 1r? Nexl
OlO], bisoxalic acid (benzylidene hydride (0H
BH), diphenylamine (DPA), diphenyl-P
-Phenylediamine (DPPD), dialkylphenol sulfide, trimethyl-tris(di-t-butyl-
Examples include 4-hydroxybenzyl)benzene.
また常温で液状の老化防止剤としては、例えばトリノニ
ルフエニルホスフアイト、ジブチルチンジラウレート、
ジオクチルジオリン酸亜鉛（ＺＤＤＰ）、トリデシルフ
オスフアイト、ジフエニルデシルフオスフアイト、トリ
フエニルフオスフアイト等があり、また絶縁性の液状媒
体としては、芳香族系の絶縁油、例えばピフエニル、ジ
エチルビフエニル、トリフエニル、アルキルナフタリン
、エチルビフエニル等がある。Examples of anti-aging agents that are liquid at room temperature include trinonylphenyl phosphite, dibutyltin dilaurate,
Examples include zinc dioctyldiophosphate (ZDDP), tridecyl phosphite, diphenyldecyl phosphite, triphenyl phosphite, etc. Insulating liquid media include aromatic insulating oils such as piphenyl and diethyl biphenyl. , triphenyl, alkylnaphthalene, ethylbiphenyl, etc.
なお、液状の老化防止剤に常温で固体の老化防止剤を溶
解させて使用することも可能である。また、架橋過酸化
物としては、汎用のジクミルパーオキサイド（ＤＣＰ）
が適しているが、できるだけ老化防止剤の消費を少くす
るため、トリアリールトリメリテート（ＴＡＴ）〔和光
純薬製、商品名ＴＲＩＡＭ−７０５〕やジビニルベンゼ
ンのような架橋助剤を併用することが望ましい。Note that it is also possible to use a liquid anti-aging agent dissolved in a solid anti-aging agent at room temperature. In addition, as a crosslinked peroxide, general-purpose dicumyl peroxide (DCP)
However, in order to reduce the consumption of anti-aging agent as much as possible, a cross-linking aid such as triaryl trimellitate (TAT) [manufactured by Wako Pure Chemical Industries, Ltd., trade name TRIAM-705] or divinylbenzene should be used in combination. is desirable.
本発明において常温で固体の老化防止剤の配合量を０．
５〜４．０部としたのは、０．５部より少ないと酸化温
度を充分上昇させることができず、逆に４．０部より多
いと効果が飽和に達するうえに表面から侵出し易くなる
等の取扱いに不便な面がでてきていずれも好ましくない
からである。なお、絶縁性の液状媒体の使用量はオレフ
イン系重合体１００部に対して０．１〜５部、好ましく
は０．２〜３部程度が適当である。In the present invention, the blending amount of the anti-aging agent that is solid at room temperature is 0.
The reason why it is set at 5 to 4.0 parts is because if it is less than 0.5 parts, the oxidation temperature cannot be raised sufficiently, and on the other hand, if it is more than 4.0 parts, the effect reaches saturation and it tends to leach out from the surface. This is because there are some inconvenient aspects to handling, such as becoming undesirable. The appropriate amount of the insulating liquid medium to be used is about 0.1 to 5 parts, preferably about 0.2 to 3 parts, based on 100 parts of the olefin polymer.
本発明における融解エントロピー（△Ｓｍ）は、△Ｈｍ
ΔＳｍ
Ｔｍ
（但し、△Ｈｍは、融解温度Ｔｍにおける融解エンタル
ピー）で表わされるパラメーターであつて、上式中の融
解エンタルピー△珈、融解温度Ｔｍは、それぞれ示差走
査熱量計（ＤＳＣ）による試料の吸熱曲線の積分値およ
び吸熱曲線のピークとして与えられる。The melting entropy (ΔSm) in the present invention is ΔHm
ΔSm Tm (where ΔHm is the enthalpy of fusion at the melting temperature Tm); in the above formula, the enthalpy of fusion ΔC and the melting temperature Tm are the endothermic values of the sample measured by a differential scanning calorimeter (DSC), respectively. It is given as the integral value of the curve and the peak of the endothermic curve.
なお、融解エントロピーは昇温速度によつて相違するの
で本発明における融解エントロピーの値は全て５℃／分
の昇温速度における値で表わした。Since melting entropy differs depending on the heating rate, all melting entropy values in the present invention are expressed as values at a heating rate of 5° C./min.
また本発明における酸化温度は、ＤＳＣによる酸化前の
示差熱曲線の直線部分と酸化開始により立上つた後の示
差熱曲線の直線部分との交点として与えられるものであ
る。本発明の絶縁体を例えば架橋ポリエチレンケーブル
の絶縁体に適用するには、まず常温で固体の老化防止剤
と架橋用過酸化物の所定量を、ほ〜同量の例えば芳香族
系の電気絶縁油に溶解させ、これをポリエチレンペレツ
トと共にブレンダ一中で充分混合してペレツト表面に付
着させた後加温してペレツト内へ溶液を侵透させる。Further, the oxidation temperature in the present invention is given as the intersection of the linear portion of the differential thermal curve before oxidation by DSC and the linear portion of the differential thermal curve after rising due to the start of oxidation. In order to apply the insulator of the present invention to the insulator of a cross-linked polyethylene cable, for example, predetermined amounts of an anti-aging agent and a cross-linking peroxide, which are solid at room temperature, are added to the The solution is dissolved in oil, thoroughly mixed with polyethylene pellets in a blender to adhere to the surface of the pellets, and then heated to penetrate the solution into the pellets.
しかる後これを常法により導体上に押出被覆し加熱架橋
すれば耐水トリ一性の良好な架橋ポリエチレンケーブル
が得られる。なお使用する老化防止剤の種類により酸化
温度上昇の効果が相違するから使用にあたつては、予じ
め各老化防止剤について使用量と酸化温度上昇との関係
を架橋用過酸化物の使用量との関連も含めて実験的に求
めておくことが望ましい。Thereafter, this is extruded and coated onto a conductor by a conventional method and cross-linked by heating to obtain a cross-linked polyethylene cable with good water resistance and stability. Note that the effect of increasing the oxidation temperature differs depending on the type of anti-aging agent used, so before use, check the relationship between the amount of each anti-aging agent used and the increase in oxidation temperature before using the cross-linking peroxide. It is desirable to find it experimentally, including the relationship with quantity.
次に実施例について記載する。Next, examples will be described.
実施例１〜２
第１表の配合の未架橋のポリエチレン組成物を１７０℃
の温度でそれぞれ最深部の厚さが約１１１となるような
凹曲面をもつ厚さ６ｍ７！Ｌのシートにプレス成型し、
この温度で更に２０分間加熱を続けて架橋させた。Examples 1-2 An uncrosslinked polyethylene composition having the formulation shown in Table 1 was heated at 170°C.
A thickness of 6m7 with a concave curved surface such that the thickness at the deepest part is approximately 111 at a temperature of ! Press molded into L sheet,
Heating was continued at this temperature for an additional 20 minutes to effect crosslinking.
得られた試料の凹曲面と裏面に導電性塗料を塗布し更に
凹曲面内に水を満たして７．５にｖ／Ｍ７７！の電圧を
２５０時間かけた後絶縁体内の水トリ一の発生数を３０
０倍の顕微鏡で観察した。Conductive paint was applied to the concave curved surface and back surface of the obtained sample, and the concave curved surface was further filled with water to give a v/M of 77! After applying this voltage for 250 hours, the number of water particles generated in the insulator was 30.
Observation was made using a 0x microscope.
Claims (1)
ペースト状となるよう調整された老化防止剤０．５〜３
．５部と架橋用過酸化物を添加した組成物を加熱架橋さ
せて成る、融解エントロピー０．０５２ｃａｌ／ｇ°Ｋ
（昇温速度５℃／分）以下、酸化温度２３５℃以上の耐
水トリ−性電気絶縁体。1 100 parts of polyolefin polymer, 0.5 to 3 of an anti-aging agent adjusted to be liquid or paste-like at room temperature
．． The entropy of fusion is 0.052 cal/g°K.
Water-resistant electrical insulator with an oxidation temperature of 235°C or higher (heating rate of 5°C/min) or lower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12214775A JPS5946264B2 (en) | 1975-10-09 | 1975-10-09 | Water resistant electrical insulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12214775A JPS5946264B2 (en) | 1975-10-09 | 1975-10-09 | Water resistant electrical insulation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5245648A JPS5245648A (en) | 1977-04-11 |
| JPS5946264B2 true JPS5946264B2 (en) | 1984-11-12 |
Family
ID=14828759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12214775A Expired JPS5946264B2 (en) | 1975-10-09 | 1975-10-09 | Water resistant electrical insulation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5946264B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60175657U (en) * | 1984-04-28 | 1985-11-21 | 佐野 和夫 | seal case |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55118938A (en) * | 1979-03-06 | 1980-09-12 | Hitachi Cable Ltd | Crosslinked polyethylene resin composition |
| JPS5837038A (en) * | 1981-08-27 | 1983-03-04 | Dainichi Nippon Cables Ltd | Crosslinked electrically insulating composition having improved water tree resistance |
| JPS58191731A (en) * | 1982-05-06 | 1983-11-09 | Tokyo Electric Power Co Inc:The | Crosslinked polyethylene composition |
| JP2512468B2 (en) * | 1987-04-13 | 1996-07-03 | 鐘淵化学工業株式会社 | Curable resin composition |
-
1975
- 1975-10-09 JP JP12214775A patent/JPS5946264B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60175657U (en) * | 1984-04-28 | 1985-11-21 | 佐野 和夫 | seal case |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5245648A (en) | 1977-04-11 |
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