JPH046217B2 - - Google Patents

Info

Publication number
JPH046217B2
JPH046217B2 JP20714783A JP20714783A JPH046217B2 JP H046217 B2 JPH046217 B2 JP H046217B2 JP 20714783 A JP20714783 A JP 20714783A JP 20714783 A JP20714783 A JP 20714783A JP H046217 B2 JPH046217 B2 JP H046217B2
Authority
JP
Japan
Prior art keywords
polyolefin
weight
parts
molded product
producing
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
Application number
JP20714783A
Other languages
Japanese (ja)
Other versions
JPS6099153A (en
Inventor
Hiroshi Hashimoto
Yosuke Kaneshige
Hiroyuki Nagano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tosoh Corp
SWCC Corp
Original Assignee
Tosoh Corp
Showa Electric Wire and Cable Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tosoh Corp, Showa Electric Wire and Cable Co filed Critical Tosoh Corp
Priority to JP20714783A priority Critical patent/JPS6099153A/en
Publication of JPS6099153A publication Critical patent/JPS6099153A/en
Publication of JPH046217B2 publication Critical patent/JPH046217B2/ja
Granted legal-status Critical Current

Links

Description

【発明の詳細な説明】[Detailed description of the invention]

[発明の技術分野] 本発明は目やにの発生を防止して外観や特性の
改善された架橋ポリオレフイン押出成形品の製造
方法に関する。 [発明の技術的背景とその問題点] 近年、ポリオレフインの架橋方法として、ポリ
オレフインに有機過酸化物とビニルトリメトキシ
シラン(VTMOSと略す)等の加水分解可能な
有機基を有するビニルシランモノマーとを添加混
合し、加熱反応によりシリコーングラフト化さ
せ、次いでジブチル錫ジラウレート等のシラノー
ル縮合触媒の存在下で水分により架橋させるいわ
ゆるシラン架橋法が用いられるようになつてきて
いる。 この方法は、従来から行われている放射線架橋
法や有機過酸化物架橋法に比べて大がかりな設備
が不要であることから、電線ケーブルの分野をは
じめ広く採用されてきている。 ところで、この方法は樹脂を押出成形する際、
押出機のダイス出口に通称目やにと称するビニル
シランモノマーによる樹脂かすが多量に発生し、
これが押出成形品の表面に付着して外観を著しく
損うという欠点があつた。特に電線の場合は外観
を損うばかりでなく、ピンホールの発生や絶縁厚
の変動の原因となつていた。 このため押出機の出口近傍にバーナーを配置
し、これで目やにを燃やして除去することが行わ
れているが、バーナーの炎をダイス出口の全周に
わたつて均一にあてるのが難しく、目やにを完全
に燃焼除去することが困難であつた。特に外径の
大きいものを押出す場合にはバーナーをダイス全
周にあてることができないため、目やにがかなり
残存する結果となつていた。また、バーナーの炎
によりダイスが加熱されることになるためダイス
温度が設定値よりはるかに高温になり、外観不良
や特性低下のおそれを来たしていた。 一方、ポリオレフインの押出し時の目やに防止
用の添加剤として、ステアリン酸アルミニウム、
ステアリン酸カルシウム、ステアリン酸亜鉛等の
ステアリン酸の金属塩やジブチル錫ジラウレー
ト、ジブチル錫ジステアレート等の金属せつけん
類が知られているが、これらはシラン架橋法にお
いては、次のような欠点があつた。 すなわち、前者のステアリン酸の金属塩は、ポ
リオレフイン100重量部に対して0.5重量部以上添
加すると押出機内で滑りを生じて押出が困難にな
つてシリコーングラフト化ポリオレフインを製造
することができず、0.5重量部より少ないと目や
に防止の効果が得られず、得られるポリオレフイ
ン成形品の熱老化特性も低下するという欠点があ
つた。 また、後者の有機金属化合物は、シラン架橋法
においてシラノール縮合触媒として使用されるも
のであり、グラフト化の際の押出機内で一部架橋
反応が生じるため、次工程の押出が困難になつて
いた。 [発明の目的] 本発明はこのような欠点を解消するためになさ
れたもので、グラフト化反応の障害を引き起こす
ことなく、また熱老化特性等の特性を低下させな
いで目やにの発生を大幅に減少させ、外観の良好
な架橋ポリオレフイン押出成形品の製造方法を提
供することを目的とする。 [発明の概要] すなわち本発明の架橋ポリオレフイン押出成形
品の製造方法は、ポリオレフイン有機過酸化物と
加水分解可能な有機基を有するビニルシランモノ
マーとを添加混合し加熱反応させて得られるシリ
コーングラフト化ポリオレフインを、シラノール
縮合触媒の存在下で押出成形し、水分により架橋
させて押出成形品を製造するにあたり、シリコー
ングラフト化ポリオレフイン100重量部に、ステ
アリン酸エステルを0.05〜0.8重量部含有させる
ことを特徴とする。 本発明に使用するステアリン酸エステルとして
は、ステアリン酸モノグリセライド(例えば花王
石鹸社製、商品名ATMOLT−95)やステアリン
ステレート・セチルパルミテート(理研ビタミン
社製、商品名リケマールS−900)等があげられ
る。 これらのステアリン酸エステルの添加量は、ポ
リオレフイン100重量部に対して0.05〜0.8重量
部、好ましくは0.1〜0.5重量部が適切である。こ
れらのステアリン酸エステルの配合量が、ポリオ
レフイン100重量部に対して0.05重量部未満では
目やに防止の効果がなく、0.8重量部を越えると
シリコーングラフト化反応の際の押出時に押出機
内で滑りを生じて押出が困難になることによる。 次に本発明方法について説明する。 しかして本発明においては、予めステアリン酸
エステルを添加混合したポリオレフイン100重量
部と、ジクミルパーオキサイド(DCPと略す)
等の有機過酸化物0.03〜0.3重量部と、
VTMOS0.5〜5重量部と、ビニルトリエトキシ
シラン等の加水分解可能な有機基を有するビニル
シランモノマー1〜5重量部とを押出機に供給
し、約200℃の温度で押出しつつ加熱反応させて、
シリコーングラフト化ポリオレフインを製造す
る。なお、このときステアリン酸エステルを予め
ポリオレフイン中に添加混合せずにDCPや
VTMOSとともに押出機中に送入して押出機中
で均一に混合するようにしてもよい。 このようにして得られたシリコーングラフト化
ポリオレフインと、ポリオレフイン100重量部に
ジブチル錫ジラウレート0.1〜10重量部を添加混
合してなるシラノール縮合触媒のマスターバツチ
とを約9:1の比率で押出機に供給し押出した
後、放置して大気中の水分により架橋させるか、
温水中に浸漬して架橋させる。 [発明の実施例] 次に本発明の実施例について説明する。 実施例 密度0.919、メルトインデツクス1.0のポリエチ
レンに次表に示す成分を添加混合し、さらに
DCP0.12重量部、VTMOS2.0重量部を加えて押
出すことによりシリコーングラフト化ポリオレフ
インを製造した。 一方、同じポリオレフインにジブチル錫ジラウ
レート0.8重量部添加混合してなるシラノール縮
合触媒マスターバツチを製造し、前述のシリコー
ングラフト化ポリオレフインとシラノール縮合触
媒マスターバツチとを9:1の比率で混合して38
mmφの押出機(ダイ口径mmφ)に供給し、 シリンダー温度 C1:C2:C3=130℃、150℃、180℃ ダイ温度=180℃ の条件で1分間に120gの速度で押出した。 このようにして得られた紐状の試料を80℃の温
水中に5時間浸漬して架橋させ、ゲル分率、機械
特性、熱老化特性を試験し、さらに押出中の状態
について観察した。結果は次表に示す通りであつ
た。
[Technical Field of the Invention] The present invention relates to a method for producing a crosslinked polyolefin extrusion molded product that prevents the occurrence of eye mucus and has improved appearance and properties. [Technical background of the invention and its problems] In recent years, as a method for crosslinking polyolefins, organic peroxides and vinylsilane monomers having hydrolyzable organic groups such as vinyltrimethoxysilane (abbreviated as VTMOS) have been added to polyolefins. A so-called silane crosslinking method has come into use in which silicone is grafted by mixing and heating, and then crosslinked by moisture in the presence of a silanol condensation catalyst such as dibutyltin dilaurate. This method has been widely adopted, including in the field of electric wires and cables, because it does not require large-scale equipment compared to conventional radiation crosslinking methods and organic peroxide crosslinking methods. By the way, when extruding resin with this method,
A large amount of resin sludge caused by vinylsilane monomer, commonly known as mucus, is generated at the die exit of the extruder.
This had the disadvantage that it adhered to the surface of the extruded product, significantly impairing its appearance. Particularly in the case of electric wires, this not only damages the appearance but also causes pinholes and variations in insulation thickness. For this reason, a burner is placed near the exit of the extruder to burn off the mucus and remove it, but it is difficult to apply the burner's flame evenly around the entire circumference of the die exit. It was difficult to completely burn and remove it. In particular, when extruding a product with a large outer diameter, the burner cannot be applied to the entire circumference of the die, resulting in a considerable amount of mucus remaining. Furthermore, since the die is heated by the flame of the burner, the die temperature becomes much higher than the set value, which may lead to poor appearance and deterioration of characteristics. On the other hand, aluminum stearate,
Metal salts of stearic acid such as calcium stearate and zinc stearate, and metal salts such as dibutyltin dilaurate and dibutyltin distearate are known, but these have the following drawbacks in the silane crosslinking method. . That is, if the former metal salt of stearic acid is added in an amount of 0.5 parts by weight or more to 100 parts by weight of polyolefin, it will cause slippage in the extruder, making extrusion difficult and making it impossible to produce silicone-grafted polyolefin. When the amount is less than 1 part by weight, the effect of preventing eye discharge cannot be obtained, and the heat aging characteristics of the resulting polyolefin molded product are also deteriorated. In addition, the latter organometallic compound is used as a silanol condensation catalyst in the silane crosslinking method, and a crosslinking reaction occurs partially in the extruder during grafting, making extrusion in the next step difficult. . [Purpose of the Invention] The present invention has been made in order to eliminate these drawbacks, and is capable of significantly reducing the occurrence of eye discharge without causing problems with the grafting reaction or deteriorating properties such as heat aging properties. An object of the present invention is to provide a method for producing a crosslinked polyolefin extrusion molded product with a good appearance. [Summary of the Invention] That is, the method for producing a crosslinked polyolefin extrusion molded product of the present invention is to produce a silicone-grafted polyolefin obtained by adding and mixing a polyolefin organic peroxide and a vinyl silane monomer having a hydrolyzable organic group and causing a heating reaction. is extrusion molded in the presence of a silanol condensation catalyst and crosslinked with water to produce an extruded product, characterized in that 100 parts by weight of silicone-grafted polyolefin contains 0.05 to 0.8 parts by weight of stearic acid ester. do. Stearic acid esters used in the present invention include stearic acid monoglyceride (for example, manufactured by Kao Soap Co., Ltd., trade name ATMOLT-95), stearin sterate cetyl palmitate (manufactured by Riken Vitamin Co., Ltd., trade name Rikemar S-900), etc. can give. The appropriate amount of these stearate esters to be added is 0.05 to 0.8 parts by weight, preferably 0.1 to 0.5 parts by weight, based on 100 parts by weight of the polyolefin. If the blending amount of these stearic acid esters is less than 0.05 parts by weight per 100 parts by weight of polyolefin, it will not be effective in preventing eye discharge, and if it exceeds 0.8 parts by weight, slipping will occur in the extruder during extrusion during the silicone grafting reaction. This is because extrusion becomes difficult. Next, the method of the present invention will be explained. However, in the present invention, 100 parts by weight of polyolefin to which stearic acid ester has been added and mixed, and dicumyl peroxide (abbreviated as DCP)
0.03 to 0.3 parts by weight of an organic peroxide such as
0.5 to 5 parts by weight of VTMOS and 1 to 5 parts by weight of a vinylsilane monomer having a hydrolyzable organic group such as vinyltriethoxysilane are supplied to an extruder, and heated and reacted while being extruded at a temperature of about 200°C. ,
Manufacture silicone grafted polyolefin. In addition, at this time, DCP or stearate is not added and mixed into the polyolefin in advance.
It may be fed into an extruder together with VTMOS so that they are uniformly mixed in the extruder. The silicone-grafted polyolefin thus obtained and a masterbatch of a silanol condensation catalyst prepared by adding and mixing 0.1 to 10 parts by weight of dibutyltin dilaurate to 100 parts by weight of the polyolefin are supplied to an extruder at a ratio of approximately 9:1. After extrusion, leave it to crosslink due to moisture in the atmosphere, or
Crosslink by immersing in warm water. [Embodiments of the Invention] Next, embodiments of the present invention will be described. Example: Add and mix the ingredients shown in the following table to polyethylene with a density of 0.919 and a melt index of 1.0, and then
A silicone-grafted polyolefin was produced by adding 0.12 parts by weight of DCP and 2.0 parts by weight of VTMOS and extruding the mixture. On the other hand, a silanol condensation catalyst masterbatch was prepared by adding and mixing 0.8 parts by weight of dibutyltin dilaurate to the same polyolefin, and the aforementioned silicone-grafted polyolefin and silanol condensation catalyst masterbatch were mixed in a ratio of 9:1.
The mixture was supplied to a mmφ extruder (die diameter mmφ) and extruded at a rate of 120 g per minute under the following conditions: cylinder temperature C 1 :C 2 :C 3 = 130°C, 150°C, 180°C, die temperature = 180°C. The string-like sample thus obtained was immersed in warm water at 80°C for 5 hours to crosslink, and its gel fraction, mechanical properties, and heat aging properties were tested, and the state during extrusion was also observed. The results were as shown in the table below.

【表】 表からも明らかなように、目やに防止剤を少量
しか添加しない比較例1や全然添加しない比較例
4では目やにがすぐ発生し、比較例2のように添
加し過ぎると押出が不可能になつた。また、比較
例3では目やにの発生が遅くなつているが、熱老
化特性が非常に低下した。 [発明の効果] 以上の実施例からも明らかなように本発明方法
によれば、熱老化特性の低下を来たさずして目や
にの発生を大幅に抑えることができ、外観の良好
な押出成形品を製造することができる。
[Table] As is clear from the table, in Comparative Example 1 in which only a small amount of eye discharge preventive agent is added, and in Comparative Example 4 in which it is not added at all, eye discharge occurs immediately, and if too much is added as in Comparative Example 2, extrusion is impossible. It became. Furthermore, in Comparative Example 3, the generation of eye mucus was slowed down, but the heat aging characteristics were significantly reduced. [Effects of the Invention] As is clear from the above examples, according to the method of the present invention, the occurrence of eye mucus can be significantly suppressed without deterioration of heat aging properties, and extrusion with a good appearance can be achieved. Molded products can be manufactured.

Claims (1)

【特許請求の範囲】 1 ポリオレフインに有機過酸化物と加水分解可
能な有機基を有するビニルシランモノマーとを添
加混合し加熱反応させて得られるシリコーングラ
フト化ポリオレフインを、シラノール縮合触媒の
存在下で押出成形し、水分により架橋させて押出
成形品を製造するにあたり、シリコーングラフト
化ポリオレフイン100重量部に、ステアリン酸エ
ステルを0.05〜0.8重量部含有させることを特徴
とする架橋ポリオレフイン押出成形品の製造方
法。 2 ステアリン酸エステルはステアリン酸グリセ
ライドである特許請求の範囲第1項記載の架橋ポ
リオレフイン押出成形品の製造方法。 3 ステアリン酸エステルは予めポリオレフイン
に添加混合されている特許請求の範囲第1項記載
の架橋ポリオレフイン押出成形品の製造方法。 4 ポリオレフインはポリエチレンである特許請
求の範囲第1項ないし第3項のいずれか1項記載
の架橋ポリオレフイン押出成形品の製造方法。
[Claims] 1. A silicone-grafted polyolefin obtained by adding and mixing an organic peroxide and a vinyl silane monomer having a hydrolyzable organic group to a polyolefin and subjecting the mixture to a heating reaction is extruded in the presence of a silanol condensation catalyst. A method for producing a crosslinked polyolefin extrusion molded product, which comprises adding 0.05 to 0.8 parts by weight of a stearic acid ester to 100 parts by weight of silicone-grafted polyolefin in producing the extrusion molded product by crosslinking with moisture. 2. The method for producing a crosslinked polyolefin extrusion molded product according to claim 1, wherein the stearate ester is stearate glyceride. 3. The method for producing a crosslinked polyolefin extrusion molded product according to claim 1, wherein the stearate ester is added and mixed with the polyolefin in advance. 4. The method for producing a crosslinked polyolefin extrusion molded product according to any one of claims 1 to 3, wherein the polyolefin is polyethylene.
JP20714783A 1983-11-04 1983-11-04 Manufacture of crosslinked polyolefin extrusion molded article Granted JPS6099153A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20714783A JPS6099153A (en) 1983-11-04 1983-11-04 Manufacture of crosslinked polyolefin extrusion molded article

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20714783A JPS6099153A (en) 1983-11-04 1983-11-04 Manufacture of crosslinked polyolefin extrusion molded article

Publications (2)

Publication Number Publication Date
JPS6099153A JPS6099153A (en) 1985-06-03
JPH046217B2 true JPH046217B2 (en) 1992-02-05

Family

ID=16534985

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20714783A Granted JPS6099153A (en) 1983-11-04 1983-11-04 Manufacture of crosslinked polyolefin extrusion molded article

Country Status (1)

Country Link
JP (1) JPS6099153A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013128964A1 (en) * 2012-02-27 2013-09-06 ポリプラスチックス株式会社 Method for producing resin molded body

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5640889B2 (en) * 2011-05-20 2014-12-17 日立金属株式会社 Electric wire / cable

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013128964A1 (en) * 2012-02-27 2013-09-06 ポリプラスチックス株式会社 Method for producing resin molded body

Also Published As

Publication number Publication date
JPS6099153A (en) 1985-06-03

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