JPH06104741B2 - Expanded polyethylene resin composition - Google Patents
Expanded polyethylene resin compositionInfo
- Publication number
- JPH06104741B2 JPH06104741B2 JP20664189A JP20664189A JPH06104741B2 JP H06104741 B2 JPH06104741 B2 JP H06104741B2 JP 20664189 A JP20664189 A JP 20664189A JP 20664189 A JP20664189 A JP 20664189A JP H06104741 B2 JPH06104741 B2 JP H06104741B2
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- JP
- Japan
- Prior art keywords
- weight
- polyethylene
- foaming agent
- parts
- 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 - Fee Related
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、有機発泡剤が極めて均一に分散れた、発泡ポ
リエチレン樹脂組成物に関する。TECHNICAL FIELD The present invention relates to a foamed polyethylene resin composition in which an organic foaming agent is extremely uniformly dispersed.
ポリエチレンは電気特性、特に、高周波特性が優れてお
り、通信ケーブルの絶縁層として従来より広く用いられ
ている。特に、誘電率を低くしてより一層の特性向上を
図るため、この絶縁層を発泡構造とすることも一般に行
われている。Polyethylene has excellent electrical characteristics, particularly high frequency characteristics, and has been widely used as an insulating layer for communication cables. In particular, in order to further reduce the dielectric constant and further improve the characteristics, it is also common to provide the insulating layer with a foamed structure.
発泡絶縁層を形成するためには、通常、ポリエチレンに
有機発泡剤を添加した組成物が使用される。しかし、有
機発泡剤は一般にポリエチレンに分散し難しいため、ポ
リエチレンに固形パラフィン等を配合し、しかも、予め
固形パラフィン等と有機発泡剤とを均一に混合したマス
ターバッチを、更に、ポリエチレンと混合する等の手段
によって、分散性を高めて使用されている。In order to form the foam insulating layer, a composition obtained by adding an organic foaming agent to polyethylene is usually used. However, since an organic foaming agent is generally difficult to disperse in polyethylene, solid paraffin or the like is blended with polyethylene, and further, a masterbatch in which solid paraffin or the like and an organic foaming agent are uniformly mixed is further mixed with polyethylene. Is used by increasing the dispersibility.
しかしながら、上記した従来の方法では、工程が複雑
で、製品コストが高くなり、しかも、発泡剤の分散も更
に改良を要するものである。However, in the above-mentioned conventional method, the process is complicated, the product cost becomes high, and further, the dispersion of the foaming agent needs further improvement.
本発明は、ポリエチレン、有機発泡剤、固形パラフィン
からなる組成物に、更に、油類を併存させた、有機発泡
剤の分散性の優れた発泡ポリエチレン組成物に関する。The present invention relates to a foamed polyethylene composition having excellent dispersibility of an organic foaming agent, in which a composition comprising polyethylene, an organic foaming agent, and solid paraffin is further co-present with oils.
即ち、本発明は、ポリエチレン100重量部、有機発泡剤
0.2〜1.5重量部、固形パラフィン0.2〜1.5重量部及び油
類0.1〜1.0重量部からなる発泡ポリエチレン樹脂組成物
に関する。That is, the present invention is based on 100 parts by weight of polyethylene and an organic foaming agent.
The present invention relates to a foamed polyethylene resin composition comprising 0.2 to 1.5 parts by weight, solid paraffin 0.2 to 1.5 parts by weight, and oils 0.1 to 1.0 parts by weight.
ポリエチレンとしては、低密度ポリエチレン、高密度ポ
リエチレンなどのエチレン単独重合体、線状低密度ポリ
エチレン、エチレン−酢酸ビニル共重合体、エチレン−
（メタ）アクリル酸エステル共重合体などの共重合体或
いはこれらを混合したものなどが挙げられる。Examples of polyethylene include ethylene homopolymers such as low density polyethylene and high density polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer, ethylene-
Examples thereof include copolymers such as (meth) acrylic acid ester copolymers and mixtures thereof.
有機発泡剤としては、常温で固体であり、分解温度以上
に加熱されると、窒素、二酸化炭素、アンモニア等のガ
スを発生する化合物であって、ジニトロソペンタメチレ
ンテトラミン、アゾジカルボンアミド及びその金属塩、
4,4′‐オキシビス（ベンゼンスルホニルヒドラジ
ド）、トルエンスルホニルヒドラジドなどが例示され
る。これらの発泡剤は単独で使用してもよいし、二種以
上を組み合わせて使用してもよい。更に、尿素、尿素系
化合物、亜鉛華、ステアリン酸亜鉛等の公知の発泡助剤
を併用してもよい。The organic foaming agent is a compound that is solid at room temperature and generates a gas such as nitrogen, carbon dioxide, or ammonia when heated to a temperature higher than the decomposition temperature, such as dinitrosopentamethylenetetramine, azodicarbonamide and its metal. salt,
Examples include 4,4'-oxybis (benzenesulfonyl hydrazide) and toluenesulfonyl hydrazide. These foaming agents may be used alone or in combination of two or more. Furthermore, known foaming aids such as urea, urea-based compounds, zinc white, and zinc stearate may be used in combination.
発泡剤の使用量は、目的とする発泡倍率、成形方法、使
用する発泡剤の種類などにより選択すればよいが、ポリ
エチレン100重量部に対して有機発泡剤0.2〜1.5重量部
の範囲が好ましい。発泡剤の使用量が0.2重量部未満で
は、充分な発泡倍率が得られず、1.5重量部を越える場
合は、発泡剤から発生するガス量が過多となり、発泡成
形体に空隙、亀裂等に生ずるため好ましくない。The amount of the foaming agent used may be selected according to the desired expansion ratio, the molding method, the type of the foaming agent used, etc., but the range of 0.2 to 1.5 parts by weight of the organic foaming agent is preferable with respect to 100 parts by weight of polyethylene. If the amount of foaming agent used is less than 0.2 parts by weight, a sufficient expansion ratio cannot be obtained, and if it exceeds 1.5 parts by weight, the amount of gas generated from the foaming agent becomes excessive, resulting in voids and cracks in the foamed molded product. Therefore, it is not preferable.
固形パラフィンとしては、パラフィンワックス、合成ポ
リエチレンワックス等が使用できる。これらの固形パラ
フィンは、平均分子量が1000〜10000程度、軟化点が100
〜120℃程度の低分重量合体である。Paraffin wax, synthetic polyethylene wax and the like can be used as the solid paraffin. These solid paraffins have an average molecular weight of about 10,000 to 10,000 and a softening point of 100.
It is a low weight combination of about 120 ° C.
固形パラフィンの使用量は、ポリエチレン100重量部に
対して0.2〜1.5重量部の範囲が好ましい。固形パラフィ
ンの使用量が0.2重量部未満では、発泡剤の分散が不良
となり、1.5重量部を越える場合は、ペレット表面が滑
り易くなり、押出成形時にペレットの供給不安定を生ず
る。The amount of solid paraffin used is preferably in the range of 0.2 to 1.5 parts by weight with respect to 100 parts by weight of polyethylene. If the amount of solid paraffin used is less than 0.2 part by weight, the dispersion of the foaming agent will be poor, and if it exceeds 1.5 parts by weight, the pellet surface will be slippery, resulting in unstable pellet supply during extrusion molding.
油類としては、脂肪酸のグリセリドを主成分とする動植
物油脂、炭化水素よりなる石油、アルコール、ケトン、
アルデヒドなどからなる芳香油等の一般の油を使用でき
る。特に、石油系潤滑油である特１号（白スピンドル
油）、１号（60スピンドル油）、２号（150スピンドル
油）等のスピンドル油が取り扱い及び入手が容易であっ
て好ましい。As the oils, animal and vegetable oils and fats containing fatty acid glycerides as main components, petroleum consisting of hydrocarbons, alcohols, ketones,
Common oils such as aromatic oils composed of aldehydes can be used. In particular, petroleum-based lubricating oils such as special No. 1 (white spindle oil), No. 1 (60 spindle oil) and No. 2 (150 spindle oil) are preferable because they are easy to handle and obtain.
油類の使用量は、ポリエチレン100重量部に対して0.1〜
1.0重量部の範囲が好ましい。油類の使用量が0.1重量部
未満では、発泡剤の分散が不良となり、1.0重量部を越
える場合は、経時と共に樹脂表面に侵出し、ペレット表
面が滑り易くなり、押出成形時にペレットの供給不安定
を生ずる。The amount of oil used is 0.1 to 100 parts by weight of polyethylene.
A range of 1.0 parts by weight is preferred. If the amount of oils used is less than 0.1 parts by weight, the dispersion of the foaming agent will be poor. Produce stability.
本発明の発泡ポリエチレン組成物は、ポリエチレン樹
脂、有機発泡剤、固形パラフィン及び油類の各成分を、
例えば、押出機、バンバリーミキサー等に供給して充分
溶融混練し、得られた組成物をペレタイザーに供給して
ペレット化することにより製造することができる。又、
ペレット化をせず、押出機から直接、物品表面に押出す
等の方法により、物品を発泡ポリエチレン層により被覆
することもでき、この様に本発明の組成物では、一度の
溶融混練によって、有機発泡剤が充分均一に分散した発
泡ポリエチレン組成物を得ることができる。The foamed polyethylene composition of the present invention comprises a polyethylene resin, an organic foaming agent, solid paraffin and oils,
For example, it can be produced by supplying the composition to an extruder, a Banbury mixer, etc., sufficiently melt-kneading, and supplying the obtained composition to a pelletizer to pelletize it. or,
The article can also be coated with a foamed polyethylene layer by a method such as extrusion from the extruder directly to the article surface without pelletizing, and thus, in the composition of the present invention, once melt-kneaded, the organic It is possible to obtain a foamed polyethylene composition in which the foaming agent is sufficiently and uniformly dispersed.
各成分の溶融混練中、有機発泡剤の実質的に分解を抑え
るため、混練温度は、有機発泡剤の分解温度を越えない
ように充分管理する必要がある。During the melt-kneading of the respective components, the kneading temperature must be sufficiently controlled so as not to exceed the decomposition temperature of the organic foaming agent in order to substantially prevent the decomposition of the organic foaming agent.
以下に実施例によって本発明を更に詳しく説明する。Hereinafter, the present invention will be described in more detail with reference to Examples.
実施例１ 高密度ポリエチレン（MI:1.7g/10分、密度:0.950g/c
m3）100重量部に、スピンドル油〔密度:0.841〜0.843g/
cm3、動粘度（40℃）:9.40〜9.52cst〕0.6部を添加し、
ヘンシェルミキーによって混合した後、有機発泡剤（分
解温度:200〜210℃）1.0重量部及び固形パラフィン〔低
分子量ポリエチレン（平均分子量:5000、密度:0.930g/c
m3、軟化点:111℃）1.0重量部を添加し、再度ヘンシェ
ルミキサーによって混合し、押出機により樹脂温度170
℃以下で押出し、ペレット化した。このペレットを押出
機に供給し、分速800m/分で走行している直径0.4mmの胴
導体上に押出温度190℃で押出被覆した。押出被覆厚さ
は平均100μであり、独立気泡の平均径は約14μであっ
た。発泡被覆層の外観は平滑であり、非常に良好であっ
た。Example 1 High-density polyethylene (MI: 1.7 g / 10 minutes, density: 0.950 g / c
m 3) to 100 parts by weight spindle oil [Density: 0.841~0.843g /
cm 3 , kinematic viscosity (40 ° C.): 9.40 to 9.52 cst] 0.6 part,
After mixing with Henschel Mickey, 1.0 part by weight of organic foaming agent (decomposition temperature: 200-210 ° C) and solid paraffin [low molecular weight polyethylene (average molecular weight: 5000, density: 0.930 g / c
m 3 , softening point: 111 ° C.) 1.0 part by weight was added, mixed again by a Henschel mixer, and the resin temperature was adjusted to 170 by an extruder.
It was extruded at below ℃ and pelletized. The pellets were supplied to an extruder, and extrusion-coated at a extrusion temperature of 190 ° C. on a body conductor having a diameter of 0.4 mm running at a speed of 800 m / min. The extruded coating thickness was 100μ on average and the closed cells had an average diameter of about 14μ. The foam coating layer had a smooth appearance and was very good.
実施例２ 線状低密度ポリエチレン（ブテン−１含有量:5モル％、
MI:2.0g/10分、密度:0.927g/cm3）100重量部に、スピン
ドル油〔密度:0.841〜0.843g/cm3、動粘度（40℃）:9.4
0〜9.52cst〕0.3部を添加し、ヘンシェルミキーによっ
て混合した後、有機発泡剤（分解温度:190〜220℃）1.2
重量部及び固形パラフィン〔低分子量ポリエチレン（平
均分子量:2000、密度:0.930g/cm3、軟化点:107℃）0.8
重量部を添加し、再度ヘンシェルミキサーによって混合
し、押出機により樹脂温度165℃以下で押出し、ペレッ
ト化した。このペレットを用いて、射出成形機を使用し
て、樹脂温度230℃、スクリュー回転数90rpm,射出圧力8
00kg/cm2、背圧40kg/cm2、射出サイクル（射出／冷却）
10/20秒、金型温度50℃の条件で、300×300×5mmの直方
体を成形した。独立気泡の径は８〜17μであり、成形体
全体に渡って均一に存在していた。又、。発泡体の外観
は平滑であり、非常に良好であった。Example 2 Linear low density polyethylene (butene-1 content: 5 mol%,
MI: 2.0 g / 10 minutes, density: 0.927 g / cm 3 ) 100 parts by weight of spindle oil (density: 0.841 to 0.843 g / cm 3 , kinematic viscosity (40 ° C.): 9.4
0-9.52cst] 0.3 part was added and mixed by Henschel Mickey, then an organic foaming agent (decomposition temperature: 190-220 ° C) 1.2
Part by weight and solid paraffin [Low molecular weight polyethylene (average molecular weight: 2000, density: 0.930 g / cm 3 , softening point: 107 ° C) 0.8
Parts by weight were added, the mixture was mixed again by a Henschel mixer, and the mixture was extruded by an extruder at a resin temperature of 165 ° C. or lower and pelletized. Using this pellet, using an injection molding machine, resin temperature 230 ℃, screw rotation speed 90 rpm, injection pressure 8
00kg / cm 2 , back pressure 40kg / cm 2 , injection cycle (injection / cooling)
A rectangular parallelepiped of 300 × 300 × 5 mm was molded under the condition that the mold temperature was 50 ° C. for 10/20 seconds. The closed cells had a diameter of 8 to 17 μm and were present uniformly throughout the molded body. or,. The foam had a smooth appearance and was very good.
比較例１ 実施例１に於いて、スピンドル油を用いなかった以外
は、実施例１と同様にして組成物を得た。この組成物を
使用して、実施例１と同様に銅導体上に押出被覆した。
その結果、押出被覆厚さは平均100μであったが、独立
気泡の径は数μから数十μの広い範囲にばらつき、又、
被覆層中で独立気泡が偏在していた。Comparative Example 1 A composition was obtained in the same manner as in Example 1 except that spindle oil was not used. This composition was used to extrusion coat copper conductors as in Example 1.
As a result, the extrusion coating thickness was 100μ on average, but the diameter of the closed cells varied in a wide range from several μ to several tens μ, and
Closed cells were unevenly distributed in the coating layer.
比較例２ 実施例１に於いて、スピンドル油を1.5部を用いた以外
は、実施例１と同様にして組成物を得た。この組成物を
使用して、実施例１と同様に銅導体上に押出被覆しよう
としたが、ペレット表面にはスピンドル油が相当量侵出
してきており、押出機へのペレットの供給が不安定とな
り、成形ができなかった。Comparative Example 2 A composition was obtained in the same manner as in Example 1 except that 1.5 parts of spindle oil was used. Using this composition, an attempt was made to perform extrusion coating on a copper conductor in the same manner as in Example 1, but a considerable amount of spindle oil had leached out onto the pellet surface, and the pellet supply to the extruder was unstable. Therefore, molding could not be performed.
〔発明の効果〕 本発明の発泡ポリエチレン組成物では、ポリエチレンに
有機発泡剤、固形パラフィン、更に油類を少量添加する
ことにより、複雑な混練添加工程を要することなく、有
機発泡剤をポリエチレン中に均一に分散させることがで
きるものである。本発明の発泡ポリエチレン組成物を用
いて得られた発泡体は、気泡の径が均一であって、その
偏在がなく、外観が極めて良好である。[Effect of the Invention] In the foamed polyethylene composition of the present invention, by adding a small amount of an organic foaming agent, solid paraffin, and oils to polyethylene, the organic foaming agent can be added to polyethylene without a complicated kneading addition step. It can be uniformly dispersed. The foam obtained using the expanded polyethylene composition of the present invention has uniform cell diameters, no uneven distribution, and an extremely good appearance.
Claims (1)
1.5重量部、固形パラフィン0.2〜1.5重量部及び油類0.1
〜1.0重量部からなる発泡ポリエチレン樹脂組成物。1. Polyethylene 100 parts by weight, organic blowing agent 0.2 to
1.5 parts by weight, solid paraffin 0.2 to 1.5 parts by weight and oils 0.1
A foamed polyethylene resin composition comprising about 1.0 part by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20664189A JPH06104741B2 (en) | 1989-08-11 | 1989-08-11 | Expanded polyethylene resin composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20664189A JPH06104741B2 (en) | 1989-08-11 | 1989-08-11 | Expanded polyethylene resin composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0370749A JPH0370749A (en) | 1991-03-26 |
| JPH06104741B2 true JPH06104741B2 (en) | 1994-12-21 |
Family
ID=16526720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20664189A Expired - Fee Related JPH06104741B2 (en) | 1989-08-11 | 1989-08-11 | Expanded polyethylene resin composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06104741B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100430392B1 (en) * | 2001-06-20 | 2004-05-10 | 최용식 | Nail clippers |
-
1989
- 1989-08-11 JP JP20664189A patent/JPH06104741B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0370749A (en) | 1991-03-26 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |