JPS61206621A - Continuous manufacture of water crosslinkable polyolefin pipe - Google Patents

Continuous manufacture of water crosslinkable polyolefin pipe

Info

Publication number
JPS61206621A
JPS61206621A JP60047994A JP4799485A JPS61206621A JP S61206621 A JPS61206621 A JP S61206621A JP 60047994 A JP60047994 A JP 60047994A JP 4799485 A JP4799485 A JP 4799485A JP S61206621 A JPS61206621 A JP S61206621A
Authority
JP
Japan
Prior art keywords
water
die
crosslinkable polyolefin
skin layer
pipe
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
Application number
JP60047994A
Other languages
Japanese (ja)
Inventor
Masaki Matsui
松井　正毅
Chiaki Momose
百瀬　千秋
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.)
Dainichi Nippon Cables Ltd
Original Assignee
Dainichi Nippon Cables Ltd
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 Dainichi Nippon Cables Ltd filed Critical Dainichi Nippon Cables Ltd
Priority to JP60047994A priority Critical patent/JPS61206621A/en
Publication of JPS61206621A publication Critical patent/JPS61206621A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
    • B29C48/336—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging one by one down streams in the die
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/24—Condition, form or state of moulded material or of the material to be shaped crosslinked or vulcanised
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To enable to continuously manufacture the titled pipe by extrusion without generating die waste over a long period of time by a structure wherein organic macromolecular material skin layer is formed on a water crosslinkable polyolefin pipe main body. CONSTITUTION:A skin layer S consisting of organic macromolecular material P2 is formed on a pipe main body R consisting of water crosslinkable polyolefin P1 by extruding the water crosslinkable polyolefin P1 simultaneously with the organic macromolecular material P2, which prevents die waste from developing. Because at least when the water crosslinkable polyolefin P1C passes the tip of a forming die 5, the outer surface of P1 has been covered with the skin layer S consisting of the organic macromolecular material, which develops no die waste, the skin layer S prevents residual unsaturated silane compound or other compounding agent from separating out onto the outer surface at the tip of the forming die 5, resulting in preventing die waste from generating.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、ダイスカスの発生を防止した水架橋性ポリオ
レフィンパイプを連続的に製造する方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for continuously producing a water-crosslinkable polyolefin pipe in which the generation of die scum is prevented.

〔従来の技術及びその問題点〕[Conventional technology and its problems]

水架橋性ポリオレフィンは通常のポリオレフィンと同じ
押出条件で押出してパイプに成形することが可能であり
、得られたパイプは蒸気槽、温水槽等で架橋されるか、
または、出荷までの保存中に、あるいは配管布設されて
実用されている間にそれ自身が含有する水分、大剣中の
水分、もしくは流体中の水分により徐々に架橋して耐熱
性、耐クリープ性、耐環境応力亀裂性などが向上する優
れた長所を有するので、現在ビルの給湯管、工場での薬
液輸送管、温泉水の輸送管、温水式ヒーティング管など
として使用されており、その需要は年々増加しつつある
。Water-crosslinkable polyolefins can be extruded and formed into pipes under the same extrusion conditions as regular polyolefins, and the resulting pipes can be crosslinked in a steam tank, hot water tank, etc.
Or, during storage before shipping, or while the piping is installed and put into practical use, it may gradually crosslink due to moisture contained in itself, moisture in the large sword, or moisture in the fluid, resulting in heat resistance and creep resistance. , has excellent advantages such as improved environmental stress cracking resistance, and is currently used as hot water supply pipes in buildings, chemical liquid transport pipes in factories, hot spring water transport pipes, hot water heating pipes, etc., and the demand for these pipes is increasing. is increasing year by year.

その需要に応え、かつ、水架橋性ポリオレフィンパイプ
は長尺品が経済的であるため、長時間にわたって連続生
産する必要があるが、水架橋性ポリオレフィンを連続押
出成形すると、ダイス先端にカスが溜り、このカスが一
定の大きさに成長すると、ダイスから剥離して形成され
たパイプの表面に付着するという問題がある。プラスチ
ックパイプの製造においては通常、押出成形されたパイ
プは、次にサイジングダイスを通過せしめられて最終成
形されるが、パイプ表面にダイスカスが付着していると
、このダイスカスがサイジングダイの内壁で押圧されて
パイプ表面に喰い込み、これが得られたパイプの欠陥部
となる問題を有している。In order to meet this demand, water-crosslinkable polyolefin pipes need to be produced continuously over a long period of time because long products are economical. However, when water-crosslinkable polyolefin pipes are continuously extruded, debris accumulates at the tip of the die. When this debris grows to a certain size, there is a problem that it peels off from the die and adheres to the surface of the formed pipe. In the production of plastic pipes, normally the extruded pipe is then passed through a sizing die to form the final shape, but if die scum is attached to the pipe surface, this die scum is pressed by the inner wall of the sizing die. There is a problem that the particles are cut into the surface of the pipe, resulting in defects in the resulting pipe.

〔問題点を解決するための手段〕[Means for solving problems]

本発明はダイスカスを発生せしめることなく水架橋性ポ
リオレフィンパイプを長時間にわたって連続押出生産す
ることができる新規な製造方法を提供するものである。The present invention provides a new manufacturing method that allows continuous extrusion production of water-crosslinkable polyolefin pipes over a long period of time without generating die scum.

すなわち２本発明の方法は水架橋性ポリオレフィンの押
出と同時にダイスカスを生じない有機高分子材料をも押
出して、水架橋性ポリオレフィンからなるパイプ本体の
上に上記の有機高分子のスキン層を形成させることを内
容としている。In other words, the method of the present invention involves extruding the water-crosslinkable polyolefin and simultaneously extruding an organic polymer material that does not produce die scum, thereby forming the organic polymer skin layer on the pipe body made of the water-crosslinkable polyolefin. The content is that.

〔作　用〕[For production]

水架橋性ポリオレフィンは通常のポリオレフィンと同程
度の低極性物質であるから不飽和有機シラン化合物の如
き極性物質を安定な状態で含有する能力に乏しい。その
ため、水架橋性ポリオレフィン中に上記のシラン化合物
が未反応のままで残留すると、それが老化防止剤などの
他の配合薬剤をも随伴させて析出し、これがダイス先端
部に溜ってダイスカスとなる。Since water-crosslinkable polyolefins are low polar substances comparable to ordinary polyolefins, they lack the ability to stably contain polar substances such as unsaturated organic silane compounds. Therefore, if the above-mentioned silane compound remains unreacted in the water-crosslinkable polyolefin, it will precipitate along with other compounded chemicals such as anti-aging agents, and this will accumulate at the tip of the die and form die scum. .

しかし、本発明においては水架橋性ポリオレフィンが少
なくともダイス先端を通過するときには。However, in the present invention, at least when the water-crosslinkable polyolefin passes through the die tip.

その外表面がダイスカスを生じない有機高分子材料のス
キン層にて覆われているので、該スキン層がダイス先端
での残留不飽和シラン化合物、あるいはその他の配合薬
剤の外表面への析出を防止し、ダイスカスの発生を防止
する。Since its outer surface is covered with a skin layer of organic polymer material that does not produce die scum, this skin layer prevents residual unsaturated silane compounds at the tip of the die or other compounded chemicals from depositing on the outer surface. and prevent the occurrence of die scum.

〔実　施　例〕〔Example〕

付図は、本発明の製造方法の実施例を説明するための押
出機先端部の説明図である。同図においてスクリー−１
を内蔵する押出機２により水架橋性ポリオレフィンＰＩ
が押出される。押出された水架橋性ポリオレフィンはス
トレートへラド８においてその内部に設置された中子４
と成形ダイス５とによりパイプ状に形成されて押出され
、該中子４の先端から供給される加圧ガスＧによりパイ
プ状を保持された状態にてサイジングダイ６を通過し、
かくしてパイプ本体Ｒが形成される。また、成形ダイス
５には小形の押出機７が連結されており、該押出機から
ダイスカスを生じない有機高分子材料Ｐ２が押出されパ
イプ本体Ｈの上にスキン層Ｓが形成される。スキン層Ｓ
の厚さは、押出安定性の面から０．０５〜１ｆｌ程度が
好着しいが、０．０５ｆｆ以下−４〜 でも充分にダイスカスの防止機能を有する。The attached figure is an explanatory view of the tip of an extruder for explaining an example of the manufacturing method of the present invention. In the same figure, Scree-1
Water-crosslinkable polyolefin PI is produced by extruder 2 with a built-in
is extruded. The extruded water-crosslinkable polyolefin is passed through the core 4 installed inside the straight helad 8.
It is formed into a pipe shape by a molding die 5 and extruded, and passes through a sizing die 6 while being held in the pipe shape by pressurized gas G supplied from the tip of the core 4.
In this way, the pipe body R is formed. Further, a small extruder 7 is connected to the molding die 5, and an organic polymer material P2 that does not produce die scum is extruded from the extruder to form a skin layer S on the pipe body H. skin layer S
The thickness is preferably about 0.05 to 1 fl from the viewpoint of extrusion stability, but a thickness of 0.05 ff or less -4 or more has a sufficient function of preventing die scum.

本発明において使用対象となし得る水架橋性ポリオレフ
ィンとしてはポリエチレン、ポリプロピレン、ホリプテ
ンー１、エチレン−酢酸ビニル共重合体、エチレン−エ
チルアクリレート共重合体、エチレン−プロピレン共重
合体、塩素化ポリエチレンなどのα−オレフィンのホモ
ポリマーやα−オレフィンを主成分とするコポリマーを
ビニルトリメトキシシラン、ビニルトリエトキシシラン
などの不飽和有機シラン化合物と、ジクミルパーオキシ
ド、ｔ−ブチル−クミル−パーオキシド、２，５−ジメ
チル−２，５−ジー（ｔ−ブチルパーオキシ）ヘキサン
、ｔ−プチルーパーオキシーイソプロピルーカーポネー
ト、１．８−ビス−（１−ブチル−パーオキシ−イソプ
ロビル）ベンゼン、ｎ−ブチル−４，４−ビス−（ｔ−
ブチル−パーオキシ）バレレートなどの有機過酸化物あ
るいはその他のラジカル発生剤とにより水架橋性に変性
したもの、あるいはエチレンと上記不飽和有機シラン化
合物の一種又は二種以上との共重合体などである。特に
好ましいものけ低密度乃芋高密度のポリエチレン、リニ
アーポリエチレンなどのポリエチレンを変性したもの、
エチレンとビニルトリメトキシシランとの共重合体であ
る。Examples of water-crosslinkable polyolefins that can be used in the present invention include polyethylene, polypropylene, phoripten-1, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-propylene copolymer, and chlorinated polyethylene. - An olefin homopolymer or an α-olefin-based copolymer is combined with an unsaturated organic silane compound such as vinyltrimethoxysilane or vinyltriethoxysilane, dicumyl peroxide, t-butyl-cumyl-peroxide, 2,5 -dimethyl-2,5-di(t-butylperoxy)hexane, t-butylperoxy-isopropylcarbonate, 1,8-bis-(1-butyl-peroxy-isopropyl)benzene, n-butyl-4 ,4-bis-(t-
Those modified to have water-crosslinking properties with organic peroxides such as butyl-peroxy)valerate or other radical generators, or copolymers of ethylene and one or more of the above unsaturated organic silane compounds. . Particularly preferred are modified polyethylenes such as low-density high-density polyethylene and linear polyethylene;
It is a copolymer of ethylene and vinyltrimethoxysilane.

本発明で用いる水架橋性ポリオレフィンはジブチル−錫
ジラウレートなどのシラノール組合触媒を含有していて
もよい。The water-crosslinkable polyolefin used in the present invention may contain a silanol combination catalyst such as dibutyl-tin dilaurate.

ダイスカスを生じない有機高分子材料としては、従来の
押出技術から経験的にダイスカスを実質的に生じること
なく長時間の押出が可能な材料を使用することができる
。たとえば、酸化防止剤などの基本的な添加剤が配合さ
れた上記と同様のα−オレフィンのホモポリマーやコポ
リマー類、あるいｉｔ−すれらα−オレフィンのホモポ
リマ・−やコポリマーが通常量の有機過酸化物からなる
架橋剤を含有して加熱架橋性となったもの、硬質の又は
可塑化されたポリ塩化ビニル、ナイロン、ポリエステル
などである。そのほか試験的に押出を行って、ダイスカ
スを発生しないか又はダイスカスの発生の程度が本発明
で用いる水架橋性ポリオレフィンのそれと比較して多く
とも１／１０以下であるものもダイスカスを生じない有
機高分子材料として用いることができる。As the organic polymer material that does not produce die scum, it is possible to use a material that can be extruded for a long time without substantially producing die scum based on conventional extrusion techniques. For example, homopolymers and copolymers of α-olefins similar to those described above, which are formulated with basic additives such as antioxidants, or homopolymers and copolymers of it-α-olefins containing ordinary amounts of organic These include materials that contain a crosslinking agent made of peroxide and are heat crosslinkable, hard or plasticized polyvinyl chloride, nylon, polyester, and the like. In addition, there are organic polymers that do not produce die casts that do not generate die casts or the degree of die casts is at most 1/10 or less compared to that of the water-crosslinkable polyolefin used in the present invention when extruded on a trial basis. It can be used as a molecular material.

本発明によって製造された水架橋性ポリオレフィンパイ
プをプラスチック継手に挿入接着する方式でパイプを接
続する場合、該継手とパイプとはスキン層Ｓを介して接
着接続されることとなるので、このスキン層の機械的強
度がパイプ接続部の耐圧強度に影響する場合がある。有
機過酸化物からなる架橋剤により又は照射により架橋し
た架橋ポリオレフィンは最終的に本発明のパイプ本体Ｒ
を構成する水架橋性ポリオレフィンが水架橋したものと
同等の機械的強度を有するので１本発明においてはスキ
ン層Ｓの構成材料、即ちダイスカスを生じない有機高分
子材料としては前記した有機過酸化物からなる架橋剤を
含有し、それにより加熱架橋することができる前記した
α−オレフィンのホモポリマーやコポリマー類あるいは
放射線などの照射により架橋するもの、たとえば前記し
たα−オレフィンのホモポリマーやコポリマー類などが
好ましく用いつる。就中ポリエチレンが特に好ましく用
いつる。照射架橋系の場合はパイプの接続に先立って継
手に挿入されるパイプの先端部分のスキン層を照射架橋
するだけでもよい。一方、有機過酸化物からなる架橋剤
を含有する材料を用いる場合は、パイプの接続に先立っ
てスキン層のみを加熱架橋してもよいし、接着剤塗布の
ための予備加熱処理（たとえば１５０〜８５０℃、５〜
Ｂ同秒間）や接着剤の加熱活性化処理などパイプ接続作
業時の加熱処理に基づく高温度を利用して接続とともに
架橋させる方式などであってもよい。When the water-crosslinkable polyolefin pipe produced according to the present invention is inserted into a plastic joint and the pipes are connected by adhesive bonding, the joint and the pipe are adhesively connected through the skin layer S. The mechanical strength of the pipe may affect the pressure resistance of the pipe connection. The crosslinked polyolefin crosslinked with a crosslinking agent consisting of an organic peroxide or by irradiation is finally used as the pipe body R of the present invention.
Since the water-crosslinkable polyolefin constituting the skin layer S has mechanical strength equivalent to that of a water-crosslinked polyolefin, in the present invention, the above-mentioned organic peroxide is used as the constituent material of the skin layer S, that is, the organic polymer material that does not produce die cast. homopolymers and copolymers of α-olefins as described above, which contain a crosslinking agent consisting of, and can be crosslinked by heating, or those that can be crosslinked by irradiation with radiation, such as homopolymers and copolymers of α-olefins as described above; The vine is preferably used. Among these, polyethylene is particularly preferably used. In the case of a radiation crosslinking system, it is sufficient to simply radiation crosslink the skin layer at the tip of the pipe to be inserted into the joint prior to pipe connection. On the other hand, when using a material containing a crosslinking agent consisting of an organic peroxide, only the skin layer may be heated and crosslinked prior to pipe connection, or a preheating treatment for applying the adhesive (e.g. 850℃, 5~
It is also possible to use a method in which the pipes are connected and cross-linked using high temperatures based on heat treatment during pipe connection work, such as heat activation treatment of the adhesive (B for the same second) or heat activation treatment of the adhesive.

〔発明の効果〕〔Effect of the invention〕

本発明によれば水架橋性ポリオレフィンパイプを長時間
にわたりダイスカスを発生させることなく連続押出製造
することが可能となる。According to the present invention, it is possible to continuously extrude a water-crosslinkable polyolefin pipe over a long period of time without generating die scum.

また、ダイスカスの発生を防止するために水架橋性ポリ
オレフィンパイプ本体の上に被覆するスキン層を照射又
は有機過酸化物で架橋される材料にて構成しておくと、
プラスチック継手を用いたパイプ接続をスキン層が架橋
した状態のものとして行うことが可能となり、これによ
り耐圧強度。In addition, in order to prevent the occurrence of die scum, if the skin layer coated on the water-crosslinkable polyolefin pipe body is made of a material that is crosslinked with irradiation or organic peroxide,
It is now possible to connect pipes using plastic joints with a cross-linked skin layer, which increases pressure resistance.

耐熱性、耐久性の優れたパイプ接続も可能となる。It also enables pipe connections with excellent heat resistance and durability.

〔比較例、実施例〕[Comparative Examples, Examples]

比較例 密度０．９４５ｆ／ｃｄ、メルトイン′デブクス０５の
ポリエチレン１００部（重量部、以下同様）、ジクミル
パーオギサイド０．２部、ビニルトリメトキシシラン２
，０部及びジブチ／Ｌ’錫ジラウレート０．０５部から
なる混合物を２００°Ｃで押出して外径８９ｆｉ、内径
７６酊の水架橋性ポリエチレンパイプを連続押出生産し
た。押出開始直後から成形ダイス先端部にダイスカスが
徐々に貯り始め、それが約８０分後に約５Ｎはどの大き
さに生長した時点でダイスから剥離し、パイプ表面に付
着した。かかるダイスカスの生成、剥離及びパイプ表面
への付着がその後はぼ等時間間隔でくり返された。Comparative Example Density: 0.945 f/cd, Melt-in' Debux 05 polyethylene 100 parts (parts by weight, hereinafter the same), dicumyl peroxide 0.2 part, vinyltrimethoxysilane 2
A mixture consisting of 0 parts of Djibouti/L'tin dilaurate and 0.05 parts of tin dilaurate was extruded at 200°C to produce a water-crosslinkable polyethylene pipe having an outer diameter of 89 fi and an inner diameter of 76 mm by continuous extrusion. Immediately after the start of extrusion, die scum gradually began to accumulate at the tip of the molding die, and after about 80 minutes, when it had grown to a size of approximately 5N, it was peeled off from the die and adhered to the pipe surface. Thereafter, the formation, peeling, and adhesion of die scum to the pipe surface were repeated at approximately equal time intervals.

実施例 付図に示す方法にてポリエチレンスキン層をパイプ本体
の上に形成した点においてのみ比較例と異るパイプの連
続生産を行ったところ、ダイスカスの発生はみられなか
った。なお、ポリエチレンスキン層の厚さは、平均０．
１　ｓｒｓであった。When a pipe was continuously produced that differed from the comparative example only in that a polyethylene skin layer was formed on the pipe body using the method shown in the accompanying drawings, no die scum was observed. Note that the average thickness of the polyethylene skin layer is 0.
It was 1srs.

【図面の簡単な説明】[Brief explanation of drawings]

図は本発明の製造方法の実施例を説明するための押出機
先端部の説明断面図である。 ２：押出機、５：成形ダイス、７：押出機、Ｒ：パイプ
本体、Ｓニスキン層。The figure is an explanatory sectional view of the tip of an extruder for explaining an embodiment of the manufacturing method of the present invention. 2: Extruder, 5: Molding die, 7: Extruder, R: Pipe body, S Niskin layer.

Claims (1)

【特許請求の範囲】 １、水架橋性ポリオレフィンの押出と同時にダイスカス
を生じない有機高分子材料をも押出して、水架橋性ポリ
オレフィンからなるパイプ本体の上に上記有機高分子の
スキン層を形成させることを特徴とする水架橋性ポリオ
レフィンパイプの連続的製造方法。 ２、ダイスカスを生じない有機高分子材料が照射架橋性
のものである特許請求の範囲第１項記載の方法。 ３、ダイスカスを生じない有機高分子材料が有機過酸化
物を含有するポリオレフィンである特許請求の範囲第１
項記載の方法。 ４、水架橋性ポリオレフィンが不飽和有機シラン化合物
と有機過酸化物とにより水架橋性に変性されたポリオレ
フィンであり、かつ、Ｖラノール縮合触媒を含むもので
ある特許請求の範囲第１項〜第８項記載の方法。 ５、水架橋性ポリオレフィンの母材及びダイスカスを生
じない有機高分子材料がそれぞれ ポリエチレンである特許請求の範囲第１項〜第４項記載
の方法。[Claims] 1. At the same time as extruding the water-crosslinkable polyolefin, an organic polymer material that does not produce die scum is also extruded to form a skin layer of the organic polymer on the pipe body made of the water-crosslinkable polyolefin. A method for continuously producing a water-crosslinkable polyolefin pipe, characterized in that: 2. The method according to claim 1, wherein the organic polymeric material that does not form die scum is crosslinkable by radiation. 3. Claim 1, wherein the organic polymeric material that does not produce die scum is a polyolefin containing an organic peroxide.
The method described in section. 4. Claims 1 to 8 in which the water-crosslinkable polyolefin is a polyolefin modified to be water-crosslinkable with an unsaturated organic silane compound and an organic peroxide, and contains a V lanol condensation catalyst. Method described. 5. The method according to claims 1 to 4, wherein the water-crosslinkable polyolefin base material and the organic polymer material that does not form die casts are each polyethylene.
JP60047994A 1985-03-11 1985-03-11 Continuous manufacture of water crosslinkable polyolefin pipe Pending JPS61206621A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60047994A JPS61206621A (en) 1985-03-11 1985-03-11 Continuous manufacture of water crosslinkable polyolefin pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60047994A JPS61206621A (en) 1985-03-11 1985-03-11 Continuous manufacture of water crosslinkable polyolefin pipe

Publications (1)

Publication Number Publication Date
JPS61206621A true JPS61206621A (en) 1986-09-12

Family

ID=12790869

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60047994A Pending JPS61206621A (en) 1985-03-11 1985-03-11 Continuous manufacture of water crosslinkable polyolefin pipe

Country Status (1)

Country Link
JP (1) JPS61206621A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0526338U (en) * 1991-09-11 1993-04-06 株式会社弥刀化工 Pseudo bamboo material continuous molding machine
JPH05262934A (en) * 1992-03-23 1993-10-12 Sumitomo Bakelite Co Ltd Polyolefin resin composition
JPH05261786A (en) * 1992-03-23 1993-10-12 Sumitomo Bakelite Co Ltd Production of extrusion molded piece of polyolefin resin
JPH05261789A (en) * 1992-03-23 1993-10-12 Sumitomo Bakelite Co Ltd Production of extrusion molded piece of polyolefin resin

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0526338U (en) * 1991-09-11 1993-04-06 株式会社弥刀化工 Pseudo bamboo material continuous molding machine
JPH05262934A (en) * 1992-03-23 1993-10-12 Sumitomo Bakelite Co Ltd Polyolefin resin composition
JPH05261786A (en) * 1992-03-23 1993-10-12 Sumitomo Bakelite Co Ltd Production of extrusion molded piece of polyolefin resin
JPH05261789A (en) * 1992-03-23 1993-10-12 Sumitomo Bakelite Co Ltd Production of extrusion molded piece of polyolefin resin

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