JP2000198118A - Mandrel for manufacturing flexible tubular resin structure - Google Patents
Mandrel for manufacturing flexible tubular resin structureInfo
- Publication number
- JP2000198118A JP2000198118A JP11001258A JP125899A JP2000198118A JP 2000198118 A JP2000198118 A JP 2000198118A JP 11001258 A JP11001258 A JP 11001258A JP 125899 A JP125899 A JP 125899A JP 2000198118 A JP2000198118 A JP 2000198118A
- Authority
- JP
- Japan
- Prior art keywords
- methyl
- mandrel
- pentene
- polymer
- cylindrical body
- 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
Landscapes
- Laminated Bodies (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、管状樹脂構造体の
製造時に用いるマンドレル（中芯）に関し、さらに詳し
くは、耐熱性、離型性、柔軟性に優れた、可撓性の管状
樹脂構造体製造に好適なマンドレルに関するものであ
る。なお、可撓性管状樹脂構造体とは、ゴムホース、プ
ラスチックホース、プラスチック管、シリコンチューブ
などのような曲げ、丸め込み等が可能な管状樹脂構造体
を意味する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mandrel (middle core) used for manufacturing a tubular resin structure, and more particularly, to a flexible tubular resin structure having excellent heat resistance, release properties and flexibility. The present invention relates to a mandrel suitable for body production. The flexible tubular resin structure refers to a tubular resin structure that can be bent, rounded, and the like, such as a rubber hose, a plastic hose, a plastic tube, and a silicon tube.
【０００２】[0002]
【従来の技術】可撓性管状樹脂構造体、例えばゴムホー
スは、一般に、真直ぐに伸ばしたマンドレルの表面に押
出機より押出した未加硫ゴムを被覆し、その上にファイ
バーを編み込み、さらにその上に未加硫ゴムを被覆した
後、ドラムに巻き付けて加硫釜で加硫、加硫後ドラムか
ら巻き出して真直ぐに伸ばし、その状態でマンドレルを
ある程度引き出したのち、引き出した部分を切断し次い
で水圧をかけてマンドレルをゴムホースから引き抜く工
程を経て製造されている。2. Description of the Related Art In general, a flexible tubular resin structure, for example, a rubber hose, is obtained by coating a surface of a straightened mandrel with unvulcanized rubber extruded from an extruder, knitting a fiber thereon, and further forming a fiber. After coating with unvulcanized rubber, it is wound around a drum, vulcanized in a vulcanizing oven, unwound from the drum after vulcanization, straightened out, and in this state, the mandrel is pulled out to some extent, and the drawn out portion is cut and then It is manufactured through the process of pulling out the mandrel from a rubber hose by applying water pressure.
【０００３】この様な製造工程に用いられるマンドレル
には、柔軟性と切断の容易性、さらには耐熱性と低い表
面張力、およびゴムホースから引き抜く際の滑り特性の
良いことなどが要求されることから、通常、ナイロンな
どのポリアミド、ポリエステル、ＥＰＤＭ、４−メチル
−１−ペンテン系重合体などのポリオレフィンよりなる
材質のものが用いられ、なかでもポリオレフィン重合体
またはポリオレフィン重合体を含む組成物、とりわけ４
−メチル−１−ペンテン系重合体は、表面張力がフッ素
樹脂に次いで低いため、ゴムホースを加硫した後、ホー
スから引き抜き易いという特徴をもち、また融点が２２
０℃以上と高いため、通常のゴムの加硫条件ではほとん
どの場合使用可能であるので好適に用いられる。[0003] The mandrel used in such a manufacturing process is required to have flexibility and easiness of cutting, heat resistance, low surface tension, and good sliding properties when pulled out from a rubber hose. Usually, a material composed of a polyolefin such as polyamide such as nylon, polyester, EPDM, and 4-methyl-1-pentene polymer is used. Among them, a polyolefin polymer or a composition containing a polyolefin polymer,
-Methyl-1-pentene-based polymer has a characteristic that surface tension is the second lowest after that of fluororesin, so that it is easy to pull out from a hose after vulcanizing a rubber hose and has a melting point of 22%.
Since it is as high as 0 ° C. or more, it can be used in most cases under ordinary vulcanization conditions of rubber, and is therefore preferably used.
【０００４】ゴムホースの加硫は通常、マンドレル上に
形成された未加硫のゴムホースをドラムに巻き、スチー
ム加硫缶に入れて加熱する方法で行われる。この際マン
ドレルが硬いとドラムに巻きづらくなるため、マンドレ
ルには柔軟性が要求される。特に内径の大きなホースの
場合には使用するマンドレルの径も大きくなるため、マ
ンドレルの材料には、より高い柔軟性が必要となる。[0004] Vulcanization of a rubber hose is usually carried out by winding an unvulcanized rubber hose formed on a mandrel around a drum, placing it in a steam vulcanizer and heating. At this time, if the mandrel is hard, it is difficult to wind around the drum, and therefore, the mandrel is required to have flexibility. In particular, in the case of a hose having a large inner diameter, the diameter of the mandrel to be used becomes large, so that the material of the mandrel requires higher flexibility.
【０００５】現在市販されている４−メチル−１−ペン
テン系重合体組成物の曲げ弾性率は、２８０〜１８００
ＭＰａの範囲にあるが、内径１５ｍｍ以上のホースに使
用するには２５０ＭＰａ以下の曲げ弾性率が求められて
いる。そのため、４−メチル−１−ペンテン系重合体お
よびその組成物の曲げ弾性率を下げるには軟化剤や軟質
樹脂をブレンドする方法が用いられる。しかしながら、
軟化剤や軟質樹脂のブレンド比を上げていくと、柔軟性
は向上するが、熱変形しやすくなり、ホースを加硫する
ときに変形しやすいという欠点があった。A commercially available 4-methyl-1-pentene polymer composition has a flexural modulus of 280 to 1800.
Although it is in the range of MPa, a bending elastic modulus of 250 MPa or less is required for use in a hose having an inner diameter of 15 mm or more. Therefore, in order to lower the flexural modulus of the 4-methyl-1-pentene polymer and its composition, a method of blending a softener or a soft resin is used. However,
As the blending ratio of the softener and the soft resin is increased, the flexibility is improved, but it is easily deformed by heat, and there is a disadvantage that the hose is easily deformed when vulcanized.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、柔軟性が優
れているとともに、高温で変形しにくいマンドレルを提
供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a mandrel which is excellent in flexibility and hardly deforms at high temperatures.
【０００７】[0007]
【課題を解決するための手段】上記の従来技術の問題点
を解決するため鋭意検討した結果、４−メチル−１−ペ
ンテン系重合体からなり、４−メチル−１−ペンテン系
重合体層の厚さが１ｍｍ以上の筒状の中空体を可撓性管
状樹脂構造体の製造用マンドレルに用いると、高い柔軟
性を持つとともに加硫時に変形し難いことを見出し本発
明を完成するに至った。As a result of diligent studies to solve the above-mentioned problems of the prior art, a 4-methyl-1-pentene polymer layer was formed. When a cylindrical hollow body having a thickness of 1 mm or more was used for a mandrel for manufacturing a flexible tubular resin structure, it was found that it had high flexibility and was not easily deformed during vulcanization, and thus completed the present invention. .
【０００８】すなわち本発明の可撓性管状樹脂構造体製
造用マンドレルは、中空筒状のマンドレルであって、少
なくとも該マンドレルの外表面に厚さ１ｍｍ以上の４−
メチル−１−ペンテン系重合体からなる筒状体を有する
ことを特徴としている。That is, the mandrel for manufacturing a flexible tubular resin structure of the present invention is a hollow cylindrical mandrel, and at least an outer surface of the mandrel has a 4-mm-thick 4-mm or more.
It is characterized by having a cylindrical body composed of a methyl-1-pentene polymer.
【０００９】本発明の好ましい態様においては、前記４
−メチル−１−ペンテン系重合体が、炭素数が２から２
０個のα−オレフィンと４−メチル−１−ペンテンのラ
ンダム共重合体であり、４−メチル−１−ペンテン構造
単位の含有率が８０重量％以上であることが望ましく、
またα−オレフィンは、１−デセン、１−ドデセン、１
−テトラデセン、１−ヘキサデセン、１−オクタデセ
ン、これらのα−オレフイン２種類以上の混合物から選
ばれるものであることが望ましい。In a preferred embodiment of the present invention,
-Methyl-1-pentene polymer having 2 to 2 carbon atoms
It is a random copolymer of 0 α-olefins and 4-methyl-1-pentene, and the content of 4-methyl-1-pentene structural units is preferably 80% by weight or more,
Α-olefins are 1-decene, 1-dodecene, 1
-Tetradecene, 1-hexadecene, 1-octadecene, and a mixture of two or more of these α-olefins are desirable.
【００１０】[0010]
【発明の実施の形態】以下、本発明の可撓性管状樹脂構
造体製造用マンドレルについて詳細に説明する。本発明
で用いられる４−メチル−１−ペンテン系重合体とは、
４−メチル−１−ペンテンの単独重合体もしくは、４−
メチル−１−ペンテンと他のα−オレフィン、例えばエ
チレン、プロピレン、１−ブテン、１−ヘキセン、１−
オクテン、１−デセン、１−テトラデセン、１−オクタ
デセン等の炭素数２ないし２０のα−オレフィンとの共
重合体で、４−メチル−１−ペンテン構造単位を８０重
量％以上の量で含む４−メチル−１−ペンテンを主体と
した重合体である。好ましい共重合成分としては、１−
デセン、１−ドデカン、１−テトラデカン、１−ヘキサ
デカン、１−オクタデカンあるいは１−エイコセンであ
る。そして、これらのα−オレフィンは２種類以上が用
いられても良い。４−メチル−１−ペンテン系重合体の
共重合成分の構造単位含有量は２０重量％以下であるこ
とが耐熱性の点で好ましい。また、本発明では、４−メ
チル−１−ペンテン系重合体は１種単独でも２種以上混
合しても用いることができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a mandrel for manufacturing a flexible tubular resin structure according to the present invention will be described in detail. The 4-methyl-1-pentene polymer used in the present invention is:
4-methyl-1-pentene homopolymer or 4-methyl-1-pentene
Methyl-1-pentene and other α-olefins such as ethylene, propylene, 1-butene, 1-hexene, 1-
A copolymer with an α-olefin having 2 to 20 carbon atoms such as octene, 1-decene, 1-tetradecene, and 1-octadecene, which contains 4-methyl-1-pentene structural unit in an amount of 80% by weight or more. -Methyl-1-pentene. Preferred copolymerization components include 1-
Decene, 1-dodecane, 1-tetradecane, 1-hexadecane, 1-octadecane or 1-eicosene. And two or more types of these α-olefins may be used. The structural unit content of the copolymer component of the 4-methyl-1-pentene polymer is preferably 20% by weight or less from the viewpoint of heat resistance. In the present invention, the 4-methyl-1-pentene polymer may be used alone or in combination of two or more.
【００１１】このような４−メチル−１−ペンテン系重
合体のメルトフローレート（ＭＦＲ）は、ＡＳＴＭ Ｄ
１２３８に準じ、荷重：５．０ｋｇ、温度：２６０℃の
条件で測定した値で、０．１ないし２００ｇ／１０分の
範囲にあることが好ましい。さらには、１．０ないし１
５０ｇ／１０分の範囲にあることが好ましい。The melt flow rate (MFR) of such a 4-methyl-1-pentene polymer is ASTM D
It is preferably 0.1 to 200 g / 10 min when measured under the conditions of load: 5.0 kg and temperature: 260 ° C. according to 1238. Furthermore, 1.0 to 1
It is preferably in the range of 50 g / 10 minutes.
【００１２】このような４−メチル−１−ペンテン系重
合体の具体例としては、三井化学（株）製のＴＰＸTM
ＭＸ００ｌ、ＭＸ００２、ＭＸ００４、ＭＸ０２１、Ｍ
Ｘ３２１、ＲＴ１８あるいはＤＸ８４５（いずれも製品
銘柄名）等が挙げられる。また、その他のメーカー製の
ものであっても上記の要件を満たす４−メチル−１−ペ
ンテン系重合体であれば、勿論、使用可能である。A specific example of such a 4-methyl-1-pentene polymer is TPX ™ manufactured by Mitsui Chemicals, Inc.
MX001, MX002, MX004, MX021, M
X321, RT18 or DX845 (all are product brand names). Of course, even if it is made by another manufacturer, it can be used as long as it is a 4-methyl-1-pentene polymer satisfying the above requirements.
【００１３】本発明の４−メチル−１−ペンテン系重合
体には、必要に応じて、他の樹脂や、軟化剤、耐候安定
剤、耐熱安定剤、スリップ剤、核剤、顔料、染料等通常
ポリオレフィンに添加して使用される各種配合剤が、本
発明の目的を損わない範囲内で添加されてもよい。The 4-methyl-1-pentene polymer of the present invention may optionally contain other resins, softeners, weather stabilizers, heat stabilizers, slip agents, nucleating agents, pigments, dyes, etc. Various compounding agents usually used in addition to the polyolefin may be added as long as the object of the present invention is not impaired.
【００１４】また、本発明の４−メチル−１−ペンテン
系重合体には、各種の繊維、例えば、ガラス繊維、アラ
ミド繊維、或いは各種の補強剤、例えばシリカ、クレ
ー、カーボンブラック、タルク、炭酸カルシウムなど
を、本発明の目的を損わない範囲で添加してもよい。The 4-methyl-1-pentene polymer of the present invention may contain various fibers, for example, glass fibers, aramid fibers, or various reinforcing agents, for example, silica, clay, carbon black, talc, carbonate. Calcium and the like may be added as long as the object of the present invention is not impaired.
【００１５】本発明に係る可撓性管状樹脂構造体製造用
マンドレルは、中空筒状のマンドレルであって、少なく
とも該マンドレルの外表面に厚さ１ｍｍ以上の４−メチ
ル−１−ペンテン系重合体からなる筒状体が形成された
ものである。中空の筒状体にすることにより、従来の棒
状体のマンドレルに比べ、曲げ弾性率を低くすることが
出来き加硫時にドラムに巻きやすくなる。そして、マン
ドレルの少なくとも外表面に厚さ１ｍｍ以上の４−メチ
ル−１−ペンテン系重合体からなる筒状体が形成されて
いるので、４−メチル−１−ペンテン系重合体に曲げ弾
性率を下げる目的で軟化剤或いは軟質樹脂などをブレン
ドしたものに比べ、加硫時に変形を起こし難い。The mandrel for manufacturing a flexible tubular resin structure according to the present invention is a hollow cylindrical mandrel, and a 4-methyl-1-pentene polymer having a thickness of at least 1 mm on at least the outer surface of the mandrel. Is formed. By making the hollow cylindrical body, the bending elastic modulus can be made lower than that of the conventional rod-shaped mandrel, and it becomes easy to wind around the drum at the time of vulcanization. And since the cylindrical body which consists of a 4-methyl-1-pentene polymer with a thickness of 1 mm or more is formed on at least the outer surface of the mandrel, the 4-methyl-1-pentene polymer has a flexural modulus of elasticity. Deformation is less likely to occur during vulcanization as compared with those blended with a softener or a soft resin for the purpose of lowering.
【００１６】マンドレルを形成する中空の筒状体の肉厚
は、求められる曲げ弾性率に応じて適宜選ばれるが、通
常、１〜１０ｍｍ程度である。また、マンドレルの少な
くとも外表面に形成される４−メチル−１−ペンテン系
重合体からなる筒状体は、厚さ１ｍｍ以上を有すれば４
−メチル−１−ペンテン系重合体単独でも良いし、その
内側に別の樹脂からなる筒状体が積層されていても良
い。積層される樹脂としては、ナイロン等のポリアミ
ド、ポリエステル、ＥＰＤＭなどのほか、４−メチル−
１−ペンテン系重合体以外のポリオレフィンが挙げられ
る。本発明においては、成形し易さと経済性の点で、４
−メチル−１−ペンテン系重合体またはその組成物のみ
からなる筒状体で形成されることが望ましい。The thickness of the hollow cylindrical body forming the mandrel is appropriately selected according to the required bending elastic modulus, but is usually about 1 to 10 mm. Further, if the cylindrical body made of 4-methyl-1-pentene polymer formed on at least the outer surface of the mandrel has a thickness of 1 mm or more, the cylindrical body is 4 mm thick.
-Methyl-1-pentene polymer may be used alone, or a cylindrical body made of another resin may be laminated inside the polymer. Examples of the resin to be laminated include polyamide such as nylon, polyester, EPDM, etc., and 4-methyl-
Polyolefins other than the 1-pentene polymer are exemplified. In the present invention, in terms of ease of molding and economy, 4
It is desirably formed of a cylindrical body composed of only a -methyl-1-pentene polymer or a composition thereof.
【００１７】４−メチル−１−ペンテン系重合体からな
る筒状体の厚さが、１ｍｍに満たないと、筒状体を曲げ
たときに筒状部分がつぶれ易くなり（キンクし易くな
り）好ましくない。If the thickness of the tubular body made of 4-methyl-1-pentene polymer is less than 1 mm, the tubular portion is easily crushed when the tubular body is bent (kinking easily). Not preferred.
【００１８】マンドレルの製造は、通常、４−メチル−
１−ペンテン系重合体を押出成形し、次いでマンドレル
の寸法精度を高めるために押出直後の溶融パリソンをサ
イザーに通すことによって行われる。すなわち、本発明
に係る４−メチル−１−ペンテン系重合体の中空筒状の
マンドレルは、例えば、押出部が円筒状のダイにより、
４−メチル−１−ペンテン系重合体を押出成形し、押出
直後の溶融パリソンをサイザーに通すことによって得ら
れる。The production of mandrels is usually carried out with 4-methyl-
This is carried out by extruding a 1-pentene polymer and then passing a molten parison immediately after extrusion through a sizer in order to increase the dimensional accuracy of the mandrel. That is, the hollow cylindrical mandrel of the 4-methyl-1-pentene polymer according to the present invention is, for example, a die having a cylindrical extruded portion.
It is obtained by extruding a 4-methyl-1-pentene polymer and passing a molten parison immediately after extrusion through a sizer.
【００１９】[0019]
【実施例】以下本発明のマンドレルについて実施例を示
すが、本発明はこれらの実施例に何ら限定されるもので
はない。EXAMPLES Examples of the mandrel of the present invention will be described below, but the present invention is not limited to these examples.
【００２０】実施例に示したマンドレルは下記の条件で
作製した。また、実施例に示した物性の測定方法と条件
を以下に示す。 ［マンドレルの作製］４−メチル−１−ペンテン系重合
体組成物を４５ｍｍφの押出機（設定温度：２８０℃）
で押出断面の外径が１６〜２５ｍｍ、内径が５〜２０ｍ
ｍのダイを通して押出して、中空の円筒状マンドレルを
成形した。また、比較例では、４−メチル−１−ペンテ
ン系重合体組成物を４５ｍｍφの押出機（設定温度：２
８０℃）で押出断面の外径が１６〜２５ｍｍのダイを通
して押出して、中空ではないマンドレルを成形した。The mandrel shown in the examples was manufactured under the following conditions. The methods and conditions for measuring the physical properties shown in the examples are shown below. [Preparation of Mandrel] Extruder of 45 mmφ of 4-methyl-1-pentene polymer composition (set temperature: 280 ° C.)
The outer diameter of the extruded cross section is 16 to 25 mm, and the inner diameter is 5 to 20 m
extruded through a m die to form a hollow cylindrical mandrel. In a comparative example, a 4-methyl-1-pentene polymer composition was extruded with a 45 mmφ extruder (set temperature: 2 mm).
(80 ° C) through a die having an outer diameter of 16 to 25 mm in an extruded cross section to form a solid mandrel.
【００２１】［物性の評価］ マンドレルの曲げ弾性率 ＡＳＴＭ Ｄ７９０に準じて曲げ弾性率を測定した。実
施例の中空のマンドレルについては、中空ではないもの
とみなして見かけの曲げ弾性率を求めた。 ビカット軟化点 ＡＳＴＭ Ｄ１５２５に準じてビカット軟化点を測定し
た。[Evaluation of Physical Properties] The bending elastic modulus of the mandrel was measured in accordance with ASTM D790. The apparent bending elastic modulus of the hollow mandrel of the example was determined assuming that the hollow mandrel was not hollow. Vicat softening point The Vicat softening point was measured according to ASTM D1525.
【００２２】（実施例１）４−メチル−１−ペンテン系
重合体（三井化学(株)製ＴＰＸTM ＭＸ００２、ＭＦ
Ｒ：２３ｇ／10分）９０重量部、パラフィン系オイル
（出光興産(株)製ダイアナプロセスオイルＰｗ３８０）
１０重量部を溶融ブレンドして作製した原料樹脂を、４
５ｍｍφの押出機（設定温度：２８０℃）で押出断面が
外径１８ｍｍ、内径１５ｍｍの円形のダイを通して押出
し、外径１６ｍｍ、内径１２ｍｍの中空の円筒状マンド
レルを作製した。このマンドレルの曲げ弾性率、ピカッ
ト軟化点を測定した。結果を表１に示す。Example 1 A 4-methyl-1-pentene polymer (TPX ™ MX002, MF manufactured by Mitsui Chemicals, Inc.)
R: 23 g / 10 min) 90 parts by weight, paraffinic oil (Diana Process Oil Pw380 manufactured by Idemitsu Kosan Co., Ltd.)
Raw resin prepared by melt-blending 10 parts by weight
The extruder was extruded with a 5 mmφ extruder (setting temperature: 280 ° C.) through a circular die having an outer diameter of 18 mm and an inner diameter of 15 mm to produce a hollow cylindrical mandrel having an outer diameter of 16 mm and an inner diameter of 12 mm. The bending elastic modulus and the Piccat softening point of this mandrel were measured. Table 1 shows the results.
【００２３】（実施例２）実施例１と同様にして作製し
た原料樹脂を、４５ｍｍφの押出機（設定温度：２８０
℃）で押出断面が外径２６ｍｍ、内径２０ｍｍの円形の
ダイを通して押出し、外径２４ｍｍ、内径１８ｍｍの中
空の円筒状マンドレルを作製した。このマンドレルの曲
げ弾性率、ビカット軟化点を測定した。結果を表１に示
す。Example 2 A raw resin produced in the same manner as in Example 1 was extruded into a 45 mmφ extruder (set temperature: 280).
C), the mixture was extruded through a circular die having an outer diameter of 26 mm and an inner diameter of 20 mm to produce a hollow cylindrical mandrel having an outer diameter of 24 mm and an inner diameter of 18 mm. The bending elastic modulus and Vicat softening point of this mandrel were measured. Table 1 shows the results.
【００２４】（実施例３）実施例１と同様にして作製し
た原料樹脂を、４５ｍｍφの押出機（設定温度：２８０
℃）で押出断面が外径１８ｍｍ、内径１２ｍｍの円形の
ダイを通して押出し、外径１６ｍｍ、内径１０ｍｍの中
空の円筒状マンドレルを作製した。このマンドレルの曲
げ弾性率、ビカット軟化点を測定した。結果を表１に示
す。Example 3 A 45 mmφ extruder (set temperature: 280) was prepared by using a raw material resin produced in the same manner as in Example 1.
C.), the mixture was extruded through a circular die having an outer diameter of 18 mm and an inner diameter of 12 mm to produce a hollow cylindrical mandrel having an outer diameter of 16 mm and an inner diameter of 10 mm. The bending elastic modulus and Vicat softening point of this mandrel were measured. Table 1 shows the results.
【００２５】（実施例４）実施例１と同様にして作製し
た原料樹脂を、４５ｍｍφの押出機（設定温度：２８０
℃）で押出断面が外径２６ｍｍ、内径１８ｍｍの円形の
ダイを通して押出し、外径２４ｍｍ、内径１６ｍｍの中
空の円筒状マンドレルを作製した。このマンドレルの曲
げ弾性率、ピカット軟化点を測定した。結果を表１に示
す。(Example 4) A 45 mmφ extruder (set temperature: 280) was prepared by using a raw resin produced in the same manner as in Example 1.
C.), the mixture was extruded through a circular die having an outer diameter of 26 mm and an inner diameter of 18 mm to produce a hollow cylindrical mandrel having an outer diameter of 24 mm and an inner diameter of 16 mm. The bending elastic modulus and the Piccat softening point of this mandrel were measured. Table 1 shows the results.
【００２６】（比較例１）実施例１と同様にして作製し
た原料樹脂を、４５ｍｍφの押出機（設定温度：２８０
℃）で押出断面が直径１８ｍｍの円形のダイを通して押
出し、外径１６ｍｍの中空ではないマンドレルを作製し
た。このマンドレルの曲げ弾性率、ピカット軟化点を測
定した。結果を表２に示す。 （比較例２）４−メチル−１−ペンテン系重合体（三井
化学(株)製ＴＰＸTM ＭＸ００２、ＭＦＲ：２３ｇ／10
分）８５重量部、パラフィン系オイル（出光興産(株)製
ダイアナプロセスオイルＰｗ３８０）１５重量部を溶融
ブレンドして作製した原料樹脂を、４５ｍｍφの押出機
（設定温度：２８０℃）で押出断面が直径１８ｍｍの円
形のダイを通して押出し外径１６ｍｍの中空ではないマ
ンドレルを作製した。このマンドレルの曲げ弾性率、ビ
カット軟化点を測定した。結果を表２に示す。Comparative Example 1 A raw material resin produced in the same manner as in Example 1 was extruded into a 45 mmφ extruder (set temperature: 280).
C), and extruded through a circular die having an extrusion cross section of 18 mm in diameter to produce a solid hollow mandrel having an outer diameter of 16 mm. The bending elastic modulus and the Piccat softening point of this mandrel were measured. Table 2 shows the results. (Comparative Example 2) 4-methyl-1-pentene polymer (TPX ™ MX002, manufactured by Mitsui Chemicals, Inc., MFR: 23 g / 10
Min.) 85 parts by weight of a paraffinic oil (Diana Process Oil Pw380 manufactured by Idemitsu Kosan Co., Ltd.) was melt-blended with 15 parts by weight of a raw resin, and the extruded cross section was extruded with a 45 mmφ extruder (set temperature: 280 ° C.). A solid mandrel with an outer diameter of 16 mm was extruded through a circular die of 18 mm diameter. The bending elastic modulus and Vicat softening point of this mandrel were measured. Table 2 shows the results.
【００２７】（比較例３）４−メチル−１−ペンテン系
重合体（三井化学(株)製ＴＰＸTM ＭＸ００２、ＭＦ
Ｒ：２３ｇ／10分）６０重量部、軟質樹脂（三井化学
(株)製、タフマーTMＳ−４０３０）３０重量部、パラフ
ィン系オイル（出光興産(株)製ダイアナプロセスオイル
Ｐｗ３８０）１０重量部を溶融ブレンドして作製した原
料樹脂を、４５ｍｍφの押出機（設定温度：２８０℃）
で押出断面が直径１８ｍｍの円形のダイを通して押出
し、外径１６ｍｍの中空ではないマンドレルを作製し
た。このマンドレルの曲げ弾性率、ビカット軟化点を測
定した。結果を表２に示す。Comparative Example 3 4-Methyl-1-pentene Polymer (TPX ™ MX002, MF manufactured by Mitsui Chemicals, Inc.)
R: 23 g / 10 min) 60 parts by weight, soft resin (Mitsui Chemicals)
A raw material resin prepared by melt-blending 30 parts by weight of Toughmer ™ S-4030 manufactured by K.K. and 10 parts by weight of paraffinic oil (Diana Process Oil Pw380 manufactured by Idemitsu Kosan Co., Ltd.) was extruded into a 45 mmφ extruder (setting). (Temperature: 280 ° C)
And then extruded through a circular die having a diameter of 18 mm to produce a solid hollow mandrel having an outer diameter of 16 mm. The bending elastic modulus and Vicat softening point of this mandrel were measured. Table 2 shows the results.
【００２８】[0028]
【表１】 [Table 1]
【００２９】[0029]
【表２】 以上の実施例に示すように、本発明の中空筒状のマンド
レルではビカット軟化点を低下させることなくマンドレ
ルの見かけの弾性率を下げることができる。一方、比較
例に示すように軟化剤としてのオイルのブレンド量を増
やしたり、軟質樹脂をブレンドしたりすると、中空筒状
にしなくても曲げ弾性率を下げ得るが、同時にビカット
軟化点も低下し、ホース等の加硫工程で変形し易くな
る。[Table 2] As shown in the above embodiments, the apparent elastic modulus of the mandrel can be reduced without lowering the Vicat softening point in the hollow cylindrical mandrel of the present invention. On the other hand, as shown in the comparative example, when the blending amount of the oil as a softening agent is increased or the soft resin is blended, the bending elastic modulus can be reduced without forming a hollow cylinder, but at the same time, the Vicat softening point also decreases. , Hoses and the like are easily deformed in the vulcanization process.
【００３０】[0030]
【発明の効果】本発明のマンドレルは、曲げ弾性率が低
く柔軟性を有し、耐熱性、離型性にも優れるので、ホー
ス等の可撓性管状樹脂構造体の加硫の際、ドラムに巻き
やすくなるとともに、高温下で変形しにくい。特に内径
が１５ｍｍ以上のゴムホース等の製造に使用される太径
の可撓性管状樹脂構造体製造用マンドレルとして好適に
用いることができる。As described above, the mandrel of the present invention has a low flexural modulus and flexibility, and is excellent in heat resistance and releasability. In addition to being easily wound, it is not easily deformed at high temperatures. In particular, it can be suitably used as a mandrel for producing a large-diameter flexible tubular resin structure used for producing a rubber hose or the like having an inner diameter of 15 mm or more.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ３２Ｂ 27/32 １０２ Ｂ３２Ｂ 27/32 １０２ // Ｂ２９Ｋ 21:00 105:24 Ｂ２９Ｌ 23:00 Ｆターム(参考） 4F100 AK03B AK03H AK03J AK08B AK08J AK41 AK48 AK75 AK80B AL03B AT00A BA01 BA02 BA03 BA04 BA05 CA04 DA11 DD31 GB51 JJ03 JK07 JK13 JL14 YY00B 4F202 AA45 AG08 AJ03 AJ09 AJ11 CA27 CB02 CK81 CM26 4F203 AA45 AG08 AJ03 AJ09 AJ11 DA08 DA11 DB02 DC01 DL11 4F207 AA45 AG08 AJ03 AJ09 AJ11 KA01 KA17 KL88 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) B32B 27/32 102 B32B 27/32 102 // B29K 21:00 105: 24 B29L 23:00 F term (reference ) 4F100 AK03B AK03H AK03J AK08B AK08J AK41 AK48 AK75 AK80B AL03B AT00A BA01 BA02 BA03 BA04 BA05 CA04 DA11 DD31 GB51 JJ03 JK07 JK13 JL14 YY00B 4F202 AA45 AG08 AJ03 AJ09 AJ11 A27 CB08 AG08 AJ03 AJ09 AJ11 KA01 KA17 KL88
Claims (3)
とも該マンドレルの外表面に厚さ１ｍｍ以上の４−メチ
ル−１−ペンテン系重合体からなる筒状体を有すること
を特徴とする可撓性管状樹脂構造体製造用マンドレル。1. A flexible tubular mandrel having a tubular body made of a 4-methyl-1-pentene polymer having a thickness of 1 mm or more on at least the outer surface of the mandrel. Mandrel for the production of conductive tubular resin structures.
が、炭素数が２から２０個のα−オレフィンと４−メチ
ル−１−ペンテンのランダム共重合体であり、４−メチ
ル−１−ペンテン構造単位の含有率が８０重量％以上で
あることを特徴とする請求項１に記載の可撓性管状樹脂
構造体製造用マンドレル。2. The 4-methyl-1-pentene polymer is a random copolymer of an α-olefin having 2 to 20 carbon atoms and 4-methyl-1-pentene, and The mandrel for manufacturing a flexible tubular resin structure according to claim 1, wherein the content of the pentene structural unit is 80% by weight or more.
が、１−デセン、１−ドデセン、１−テトラデセン、１
−ヘキサデセン、１−オクタデセン、または、これらの
α−オレフイン２種類以上の混合物と、４一メチル−１
−ペンテンとのランダム共重合体であることを特徴とす
る請求項２に記載の可撓性管状樹脂構造体製造用マンド
レル。3. The method of claim 1, wherein the 4-methyl-1-pentene polymer is 1-decene, 1-dodecene, 1-tetradecene,
Hexadecene, 1-octadecene, or a mixture of two or more of these α-olefins, and 4-methyl-1
The mandrel for manufacturing a flexible tubular resin structure according to claim 2, wherein the mandrel is a random copolymer with pentene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11001258A JP2000198118A (en) | 1999-01-06 | 1999-01-06 | Mandrel for manufacturing flexible tubular resin structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11001258A JP2000198118A (en) | 1999-01-06 | 1999-01-06 | Mandrel for manufacturing flexible tubular resin structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000198118A true JP2000198118A (en) | 2000-07-18 |
Family
ID=11496447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11001258A Pending JP2000198118A (en) | 1999-01-06 | 1999-01-06 | Mandrel for manufacturing flexible tubular resin structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000198118A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012053423A1 (en) | 2010-10-19 | 2012-04-26 | 三井化学株式会社 | Poly-4-methyl-1-pentene based resin composition and molded products obtained from the composition |
-
1999
- 1999-01-06 JP JP11001258A patent/JP2000198118A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012053423A1 (en) | 2010-10-19 | 2012-04-26 | 三井化学株式会社 | Poly-4-methyl-1-pentene based resin composition and molded products obtained from the composition |
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