JPS5884831A - Low density polyethylene foam composition - Google Patents
Low density polyethylene foam compositionInfo
- Publication number
- JPS5884831A JPS5884831A JP18322681A JP18322681A JPS5884831A JP S5884831 A JPS5884831 A JP S5884831A JP 18322681 A JP18322681 A JP 18322681A JP 18322681 A JP18322681 A JP 18322681A JP S5884831 A JPS5884831 A JP S5884831A
- Authority
- JP
- Japan
- Prior art keywords
- density polyethylene
- low density
- weight
- parts
- elastomer
- 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
- 229920001684 low density polyethylene Polymers 0.000 title claims abstract description 16
- 239000004702 low-density polyethylene Substances 0.000 title claims abstract description 16
- 239000000203 mixture Substances 0.000 title claims abstract description 15
- 239000006260 foam Substances 0.000 title description 6
- 229920001971 elastomer Polymers 0.000 claims abstract description 10
- 239000000806 elastomer Substances 0.000 claims abstract description 10
- 239000004156 Azodicarbonamide Substances 0.000 claims abstract description 6
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims abstract description 6
- 235000019399 azodicarbonamide Nutrition 0.000 claims abstract description 6
- 239000004698 Polyethylene Substances 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 239000002666 chemical blowing agent Substances 0.000 claims description 5
- 238000005187 foaming Methods 0.000 abstract description 11
- 239000004088 foaming agent Substances 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 abstract description 2
- 239000005977 Ethylene Substances 0.000 abstract description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 2
- 230000003449 preventive effect Effects 0.000 abstract description 2
- 239000004711 α-olefin Substances 0.000 abstract description 2
- 239000003963 antioxidant agent Substances 0.000 abstract 1
- 230000003078 antioxidant effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 239000000155 melt Substances 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 210000000497 foam cell Anatomy 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 239000004604 Blowing Agent Substances 0.000 description 2
- 239000004594 Masterbatch (MB) Substances 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229920002397 thermoplastic olefin Polymers 0.000 description 2
- NBOCQTNZUPTTEI-UHFFFAOYSA-N 4-[4-(hydrazinesulfonyl)phenoxy]benzenesulfonohydrazide Chemical compound C1=CC(S(=O)(=O)NN)=CC=C1OC1=CC=C(S(=O)(=O)NN)C=C1 NBOCQTNZUPTTEI-UHFFFAOYSA-N 0.000 description 1
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 1
- MWRWFPQBGSZWNV-UHFFFAOYSA-N Dinitrosopentamethylenetetramine Chemical compound C1N2CN(N=O)CN1CN(N=O)C2 MWRWFPQBGSZWNV-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 229920005601 base polymer Polymers 0.000 description 1
- 210000000170 cell membrane Anatomy 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- LRCFXGAMWKDGLA-UHFFFAOYSA-N dioxosilane;hydrate Chemical compound O.O=[Si]=O LRCFXGAMWKDGLA-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229960004029 silicic acid Drugs 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920006027 ternary co-polymer Polymers 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Description
【発明の詳細な説明】
１）発明の技術分野
本発明は高発泡率で、かつ断面真円形状に押出し得る、
特に高発泡ケーブルの絶縁層の形成に適した高発泡ポリ
エチレン組成物に関する。DETAILED DESCRIPTION OF THE INVENTION 1) Technical field of the invention The present invention has a high foaming rate and can be extruded into a perfectly circular cross section.
In particular, the present invention relates to a highly foamed polyethylene composition suitable for forming an insulating layer of a highly foamed cable.
最近、特に共聴関係（ＣＡＴＶ）で使用される高周波同
軸ケーブルには高品質化が要望されてきてお抄、これに
伴ってその絶縁体には７０〜９０％の高い発泡率を有す
ることが要請されている。Recently, there has been a demand for higher quality high-frequency coaxial cables, especially those used for public listening (CATV). It is requested.
このような高発泡ケーブルの押出方法としては、導体上
に、（イ）化学発泡剤を配合したポリエチレンを押出す
る方法と、（ロ）押出機中で溶融したポリエチレン中に
フレオン系発泡剤を圧入する方法が従来から行なわれて
いる。There are two methods for extruding such highly foamed cables: (a) extruding polyethylene mixed with a chemical foaming agent onto the conductor; and (b) injecting a freon-based foaming agent into melted polyethylene in an extruder. This method has been used conventionally.
２）従来技術の問題点
（イ）の方法は、通常の一軸押出機をそのまま利用する
ことができる利点があるが、発泡剤を分解させるために
樹脂温度を高くせざるを得ないので樹脂の溶融粘度が下
り、分解ガス圧により表層の発泡セルが破壊して６０％
以上の高発泡率が得られにくい。そこで、この発泡セル
が破壊する前に外から冷却固化する手法がとられるが、
内部に温度不均一が生じ発泡被覆が扁平してくるという
欠点がある。また、（ロ）の方法はフレオン系ガスが気
化するときの蒸発潜熱により発泡セル膜が急冷されるた
め７０％以上の高発泡率が容易に得られるとり・う利点
はあるが、プレオン系発泡剤圧入のために通常の一軸押
出機を使用することができず、新たな設備の付加が必要
になるという難点があった。2) Problem with the prior art The method (a) has the advantage of being able to use a normal single-screw extruder as is, but the resin temperature has to be raised to decompose the blowing agent. The melt viscosity decreases, and the foam cells on the surface layer are destroyed by the cracked gas pressure, resulting in a reduction of 60%.
It is difficult to obtain a higher foaming rate. Therefore, a method is used to cool and solidify the foamed cells from the outside before they are destroyed.
There is a disadvantage that temperature non-uniformity occurs inside the foam coating and the foam coating becomes flat. In addition, method (b) has the advantage that a high foaming rate of 70% or more can be easily obtained because the foamed cell membrane is rapidly cooled by the latent heat of vaporization when the freon-based gas vaporizes. There was a problem in that a normal single-screw extruder could not be used to press in the agent, and new equipment had to be added.
３）発明の目的および構成
本発明者尋は、かかる従来の難点を解消すぺ〈鋭意研究
をすすめた結果、低密度ポリエチレンに小量のエラスト
マーをブレンドしたものをベースポリマーとし、これに
小量の化学発泡剤を配合して常法により押出機を用いて
発泡押出しを行った場合、ペマスポリマーの溶融粘度の
温度依存性が小さくな抄、かつ同一温度での溶融粘度、
特に発泡過１１におけるせん断速度が小さｖｈところで
の溶融粘度が大きぐなって、発泡セルの破壊が抑制され
、高発泡率でしかも断面真円形状の発泡押出しが可能に
なることを見出し九。3) Purpose and Structure of the Invention The present inventor has devised a solution to these conventional difficulties.As a result of intensive research, the present inventor has found that a base polymer is a blend of low density polyethylene with a small amount of elastomer, and a small amount of elastomer is blended with low density polyethylene. When foaming extrusion is carried out using an extruder using a conventional method with a chemical blowing agent of
In particular, it was found that the melt viscosity at the point where the shear rate vh in the foaming process 11 is low, the destruction of the foam cells is suppressed, and foam extrusion with a high foaming rate and a perfectly circular cross section is possible.9.
本発明は、かかる知見に基いてなされたもので。The present invention was made based on this knowledge.
低密度ポリエチレン１００重量部に、この低密度ポリエ
チレンと相溶性の良好な□エラストマー５〜２５重量部
、化学発泡剤０．５〜５．５重量部を配合して成ること
を特徴とする高発泡ポリエチレン組成物を提供しようと
するものである。A highly foamable product characterized by comprising 100 parts by weight of low-density polyethylene, 5 to 25 parts by weight of an elastomer having good compatibility with the low-density polyethylene, and 0.5 to 5.5 parts by weight of a chemical foaming agent. It is an object of the present invention to provide a polyethylene composition.
本発明に使用する低密度ポリエチレンは密度０．９１８
〜０．９２８ ｇ／ａｍ３ のものであり、溶融粘度
（Ｍ、Ｉ ） １．０〜５．０程度のものが適している
。The low density polyethylene used in the present invention has a density of 0.918
~0.928 g/am3, and a melt viscosity (M, I) of about 1.0 to 5.0 is suitable.
また、本発明に使用する低密度ポリエチレンと相溶性を
有するエラストマーとしては、エチレン・プロピレン共
重合体をはじめとするエチレン−α−オレフィン共重合
体、エチレン佛フロピレン・ジエン三元共重合体、１．
２−ポリブタジェン、酢酸ビニル含量の高Ｖｈエチレン
・酢酸ビニル共重合体、オレフィン系の熱可塑性ゴム（
ＴＰＲ）。In addition, elastomers that are compatible with low-density polyethylene used in the present invention include ethylene-α-olefin copolymers including ethylene-propylene copolymers, ethylene-propylene-diene ternary copolymers, ．．
2-polybutadiene, high Vh ethylene/vinyl acetate copolymer with vinyl acetate content, olefin thermoplastic rubber (
TPR).
スチレン・ブタジェンブロック共重合体等がある。Examples include styrene-butadiene block copolymers.
また、本発明に使用する化学発泡剤としては、アゾジカ
ルボンアミド（ＡＤＣＡ）、ｐ、ｐ’−オキシビス（ベ
ンゼンスルホニル・ヒドラジド）〔０ＢＳＲ）、Ｎ、Ｎ
’−ジニトロソペンタメチレンテトラミンあるＶｌはこ
れと発泡助剤等との混合物、例えばファイセルｇＰ−Ａ
（商品名：７ァイゾンス、リミテッド社、アゾジカル
ボンアミド６ｏ重量％と含水シリカ４０重量％との混合
物）等がある。In addition, the chemical blowing agents used in the present invention include azodicarbonamide (ADCA), p,p'-oxybis(benzenesulfonyl hydrazide) [0BSR), N,N
'-Dinitrosopentamethylenetetramine A certain Vl is a mixture of this and a foaming aid, such as Ficel gP-A.
(Product name: 7IZONS, Ltd., a mixture of 60% by weight of azodicarbonamide and 40% by weight of hydrated silica).
なお、本発明の組成物には、必要に応じて発泡助剤、老
化防止剤、防錆剤その他この種の組成物に使用可能な他
の添加剤を配合することも可能である。Note that the composition of the present invention may also contain other additives usable in this type of composition, such as a foaming aid, an anti-aging agent, a rust preventive, and the like, if necessary.
本発明において、エラストマーと化学発泡剤の配合量を
前記のように限定したのは次の理由による。In the present invention, the blending amounts of the elastomer and the chemical blowing agent are limited as described above for the following reason.
すなわち、エラストマーの配合量が５重量部よシ少なめ
と本発明としての効果がなく、逆に２５重量部を越える
と溶融張力が大きくなりすぎて高発泡率が得られにくく
な抄、化学発泡剤の配合量が０．５重量部より少ないと
分解ガス量が少なくなって発泡率が低、下し、逆に３．
５重量部を越すと分解ガス量が過大となりて発泡セルが
破壊し易くなる上に不経済となるからによる。In other words, if the amount of the elastomer is less than 5 parts by weight, the present invention will not be effective, and if it exceeds 25 parts by weight, the melt tension will become too large, making it difficult to obtain a high foaming rate. If the amount of 3. is less than 0.5 parts by weight, the amount of decomposed gas will be small and the foaming rate will be low.
This is because if the amount exceeds 5 parts by weight, the amount of decomposed gas becomes excessive, which makes the foamed cells easy to destroy and becomes uneconomical.
本発明にお７ａては、上記各配合成分を同時に混合して
もよく、あるいは低密度ポリエチレンとエラストマーと
を混練した組成物のペレットと、発泡剤のマスターバッ
チとを別々に製造しておき、発泡体製造時にこれらを所
定の配合比率で混合して押出機のホッパーに供給するよ
うにしてもよい。In 7a of the present invention, the above-mentioned ingredients may be mixed simultaneously, or pellets of a composition obtained by kneading low-density polyethylene and an elastomer and a masterbatch of a blowing agent may be separately produced, When producing the foam, these may be mixed at a predetermined blending ratio and supplied to the hopper of the extruder.
４）発明の実施例（構成、作用、効果）実施例
低密度ポリエチレン〔商品名：Ｌ５１９、宇部興産製、
ｄ−０，９１９、Ｍ、Ｉ−３，５１１００重量部とオレ
フィン系熱可塑性ゴム〔商品名：ミラストマ−８５３０
，三片石油化学製、ｄ−０，８９、Ｍ、Ｉ＝３．０）１
０重量部とを６５ｍｍ５２ｒ押出機により混練し、得ら
れたひも状の組成物を破砕機にかけてペレット状に成形
した。4) Examples of the invention (structure, action, effects) Examples Low density polyethylene [Product name: L519, manufactured by Ube Industries, Ltd.
d-0,919, M, I-3,51 100 parts by weight and olefinic thermoplastic rubber [Product name: Milastomer-8530
, Mikata Petrochemical, d-0,89, M, I=3.0)1
0 parts by weight were kneaded using a 65 mm 52r extruder, and the resulting string-like composition was crushed using a crusher to form pellets.
これとは別に上記した低密度ポリエチレン〔商品名：
Ｌ５１９ ）にセルマイクＣＥ（ＡＤＣＡ、三協化成製
）を２０％含有させたマスターノ（ツチを常法により製
造し、上記した低密度ポリエチレンとオレフィン系熱可
塑性ゴムとの混合物のペレットとこのマスターバッチと
を重量比で、９：１の割合で混合し、これを９０１〆中
の一軸押出機に供給し、第１表の押出条件で１．８ｍａ
＋＄の軟鋼線上に押出被覆して発泡させた。Apart from this, the above-mentioned low-density polyethylene [product name:
L519) containing 20% Cellmic CE (ADCA, manufactured by Sankyo Kasei) by a conventional method, pellets of the above-mentioned mixture of low density polyethylene and olefinic thermoplastic rubber and this masterbatch. were mixed at a weight ratio of 9:1, and this was fed to a single screw extruder in 901.
It was extrusion coated onto +$ mild steel wire and foamed.
第 １ 表
得られた発泡同軸ケーブルの形状および特性は第２表の
通りであった。Table 1 The shape and characteristics of the foamed coaxial cable obtained are as shown in Table 2.
第 ２ 表
なお、上表中の比較例は、ペースポリマーを低密度ポリ
エチレン単独とした以外は、実施例と同様にして製造し
た発泡同軸ケーブルであって比較のために示したもので
ある。Table 2 The comparative example in the above table is a foamed coaxial cable manufactured in the same manner as in the example except that low density polyethylene was used alone as the pace polymer, and is shown for comparison.
以上の実施例から明らかなように、本発明によれば、高
発泡率で、しか本表層部の発泡セルのつぶれのない発泡
体を得ることができる。As is clear from the above examples, according to the present invention, it is possible to obtain a foam with a high expansion rate and without collapse of the foam cells in the main surface layer portion.
代理人弁理士 頭出 佐− 同上 山田明信Representative Patent Attorney: Sato Kado Same as above Akinobu Yamada
Claims (1)
リエチレンと相溶性の良好なエラストマー５〜２５重量
部、化学発泡剤０．５〜６．５重量部を配合して成るこ
とを特徴とする高発泡ポリエチレン組成物。 ２、化学発泡剤は、アゾジカルボンアミド又はＰ、 Ｐ
’−オキシビス（ベンぞンスルホニル・ヒドラジド）で
ある特許請求の範囲−第１項記載の高発泡ポリエチレン
組成物。[Claims] 1. Comprising 100 parts by weight of low-density polyethylene, 5 to 25 parts by weight of an elastomer having good compatibility with the low-density polyethylene, and 0.5 to 6.5 parts by weight of a chemical blowing agent. A highly expanded polyethylene composition characterized by: 2. Chemical blowing agent is azodicarbonamide or P, P
The highly foamed polyethylene composition according to claim 1, which is '-oxybis(benzosulfonyl hydrazide).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18322681A JPS5884831A (en) | 1981-11-16 | 1981-11-16 | Low density polyethylene foam composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18322681A JPS5884831A (en) | 1981-11-16 | 1981-11-16 | Low density polyethylene foam composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5884831A true JPS5884831A (en) | 1983-05-21 |
Family
ID=16131993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18322681A Pending JPS5884831A (en) | 1981-11-16 | 1981-11-16 | Low density polyethylene foam composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5884831A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58208327A (en) * | 1982-05-30 | 1983-12-05 | Dainichi Nippon Cables Ltd | Resin composition for molding heat-insulating foam layer |
| JP2007301640A (en) * | 2006-05-08 | 2007-11-22 | Kanetec Co Ltd | Faceplate for magnetic chuck |
-
1981
- 1981-11-16 JP JP18322681A patent/JPS5884831A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58208327A (en) * | 1982-05-30 | 1983-12-05 | Dainichi Nippon Cables Ltd | Resin composition for molding heat-insulating foam layer |
| JPH0247494B2 (en) * | 1982-05-30 | 1990-10-19 | Mitsubishi Cable Ind Ltd | |
| JP2007301640A (en) * | 2006-05-08 | 2007-11-22 | Kanetec Co Ltd | Faceplate for magnetic chuck |
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