JP4733972B2 - Mandrel - Google Patents
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- JP4733972B2 JP4733972B2 JP2004357433A JP2004357433A JP4733972B2 JP 4733972 B2 JP4733972 B2 JP 4733972B2 JP 2004357433 A JP2004357433 A JP 2004357433A JP 2004357433 A JP2004357433 A JP 2004357433A JP 4733972 B2 JP4733972 B2 JP 4733972B2
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Description
本発明はゴムホース等のホースの製造時に使用するマンドレルに関し、詳しくは、ホース（成形物）からの抜け性に優れたマンドレルに関する。 The present invention relates to a mandrel used when manufacturing a hose such as a rubber hose, and more particularly to a mandrel excellent in detachability from a hose (molded product).
ゴムホースは、ゴムをマンドレル上でホースに成形し、ゴムを加硫した後、ホースからマンドレルを抜き取ることによって製造される。このマンドレルとしては、長尺化が容易で（「長尺」とは５０ｍ以上）、寸法精度がよく、取扱い易い等の点から、樹脂を成形した樹脂マンドレルが多く使用されている。 A rubber hose is manufactured by forming rubber into a hose on a mandrel, vulcanizing the rubber, and then extracting the mandrel from the hose. As this mandrel, a resin mandrel obtained by molding a resin is often used from the viewpoints of easiness in lengthening (“long” is 50 m or more), good dimensional accuracy, and easy handling.
マンドレルを使用したゴムホースの製造においては、加硫後のホースからのマンドレルの抜け性を良くするために、通常、マンドレルの表面に予め離型剤が塗布される（特許文献１）。しかし、マンドレル表面に離型剤を塗布しても、離型剤がマンドレル表面で塊状に凝集して、良好なマンドレルの抜け性が得られない場合がある。すなわち、離型剤がマンドレル表面で凝集するとマンドレルとゴムが固着する箇所ができ、この固着部がマンドレルを引き抜く際の抵抗になって、マンドレルの引き抜きに多大な労力が必要になる。また、マンドレルを強引に引き抜くことで、マンドレル自体に変形等が発生する場合もある。マンドレルに塗布する離型剤には、ゴムホースへの成分移行、作業のし易さ等の点から、揮発性溶媒に不活性な固形物粒子を分散させたタイプの離型剤が多く用いられているが、該分散液タイプの離型剤を使用した場合に、上記の問題（マンドレルの表面での離型剤の凝集）が特に起りやすく、その対策が強く求められている。 In the manufacture of a rubber hose using a mandrel, a release agent is usually applied to the surface of the mandrel in advance in order to improve the mandrel detachability from the hose after vulcanization (Patent Document 1). However, even if a release agent is applied to the mandrel surface, the release agent may aggregate in a lump on the mandrel surface, and good mandrel detachability may not be obtained. That is, when the release agent aggregates on the surface of the mandrel, a portion where the mandrel and the rubber are fixed is formed, and this fixed portion becomes resistance when the mandrel is pulled out, and much labor is required for pulling out the mandrel. Further, when the mandrel is forcibly pulled out, deformation or the like may occur in the mandrel itself. As the release agent applied to the mandrel, a release agent of a type in which solid particles inert to a volatile solvent are dispersed is often used from the viewpoints of component transfer to a rubber hose and ease of work. However, when the dispersion type mold release agent is used, the above problem (aggregation of the mold release agent on the surface of the mandrel) is particularly likely to occur, and a countermeasure for it is strongly demanded.
なお、マンドレルの表面を適度な粗さの粗面に加工することで、離型剤の塗布性（均一塗布性）は向上する。しかし、マンドレルの表面を均一な粗さの粗面に加工することは容易でなく、そのようなマンドレルを得ようとするとマンドレルのコスト増を招いてしまう。
本発明は、上記事情に鑑みなされたもので、その解決しようとする課題は、その外周側面に塗布された離型剤が凝集せず、均一に拡がって保持されるマンドレルを提供することである。 The present invention has been made in view of the above circumstances, and a problem to be solved is to provide a mandrel in which the release agent applied to the outer peripheral side surface thereof is not aggregated but is uniformly spread and held. .
本発明者等は上記課題を解決するために鋭意研究した結果、マンドレルの表面を、樹脂に帯電防止剤（好ましくは永久帯電防止剤）を配合した樹脂組成物で形成することで、該表面に離型剤を塗布すると、離型剤が凝集せず、均一に拡がって保持され得ることを見出し、本発明を完成するに到った。 As a result of diligent research to solve the above-mentioned problems, the present inventors have formed the surface of the mandrel with a resin composition in which an antistatic agent (preferably a permanent antistatic agent) is blended with a resin. It has been found that when a release agent is applied, the release agent does not aggregate and can be spread and held uniformly, and the present invention has been completed.
すなわち、本発明は、
（１）その外周側面が樹脂に導電性を有する高分子で構成された帯電防止剤を樹脂１００重量部当たり５〜３０重量部配合した樹脂組成物からなるマンドレルであって、外周側面の表面抵抗が１×１０ １１ Ω（２５℃、５０％ＲＨ）以下であることを特徴とするホース製造用マンドレル、
（２）樹脂がポリアミド、ポリエステルエラストマー及びポリ（４−メチル−１−ペンテン）から選ばれる１種または２種以上である、上記（１）記載のマンドレル、
（３）上記（１）又は（２）に記載のマンドレルを使用し、ホース成形前に該マンドレルの外周側面に離型剤を塗布してホース成形を行うことを特徴とする、ホースの製造方法、及び
（４）離型剤が揮発性溶媒に離型性粒子を分散させた分散液タイプの離型剤である、上記（３）記載の方法、に関する。
That is, the present invention
(1) the outer peripheral side surface a Rumandoreru such that the antistatic agent composed of a polymer having a conductivity to the resin from a resin composition obtained by blending 5 to 30 parts by weight per 100 parts by weight of the resin, the surface of the outer peripheral side surface resistance 1 × 10 11 Ω (25 ℃ , 50% RH) hose manufacturing mandrel, characterized in der Rukoto less,
(2) tree fat is polyamide, one or more selected from polyester elastomers, and poly (4-methyl-1-pentene), the (1) Symbol placement of the mandrel,
(3) A method for producing a hose, wherein the mandrel according to (1) or (2) is used, and a hose is formed by applying a release agent to the outer peripheral side surface of the mandrel before forming the hose. , and (4) the release agent is a releasing agent dispersion type prepared by dispersing the releasing particles in a volatile solvent, the above method Symbol (3) Symbol mounting concerns.
本発明のマンドレルによれば、ホースの成形前にその外周側面に離型剤を塗布すると、該離型剤が凝集せずに均一に拡がって保持されるので、成形して得られるホースとマンドレルの固着が防止され、その結果、マンドレルをホースから引き抜き易くなる。よって、本発明のマンドレルを使用すれば、ホース製造におけるホースからのマンドレルの引き抜き作業の作業性が向上し、変形等の不具合のないホースを効率良く製造することができる。 According to the mandrel of the present invention, when a release agent is applied to the outer peripheral side surface of the hose before molding, the mold release agent is uniformly spread without being agglomerated and held. Therefore, the hose and mandrel obtained by molding Is prevented, and as a result, the mandrel can be easily pulled out of the hose. Therefore, if the mandrel of the present invention is used, workability of pulling out the mandrel from the hose in the manufacture of the hose can be improved, and a hose free from defects such as deformation can be efficiently manufactured.
以下、本発明をより詳細に説明する。
本発明のホース製造用マンドレルは、その外周側面を樹脂に帯電防止剤を配合した樹脂組成物（以下、「帯電防止剤含有樹脂組成物」ともいう。）で形成したことが特徴である。
ここで、「マンドレルの外周側面」とは、マンドレルの外周面のうちのその上でホースの成形がなされるマンドレルの軸線と平行な側部の外周面を指す。
Hereinafter, the present invention will be described in more detail.
The mandrel for producing a hose of the present invention is characterized in that its outer peripheral side surface is formed of a resin composition in which an antistatic agent is blended with a resin (hereinafter also referred to as “antistatic agent-containing resin composition”).
Here, the “outer peripheral side surface of the mandrel” refers to the outer peripheral surface of the side part parallel to the axis of the mandrel on which the hose is formed, of the outer peripheral surface of the mandrel.
本発明のマンドレルでは、その外周側面に塗布した離型剤は凝集することなく、均一に拡がって保持される。 In the mandrel of the present invention, the release agent applied to the outer peripheral side surface of the mandrel is uniformly spread and held without agglomeration .
本発明において、帯電防止剤含有樹脂組成物に用いる樹脂としては、熱可塑性樹脂が好ましく、例えば、ＡＢＳ樹脂（アクリロニトリル−ブタジエン−スチレン共重合体）；ＰＥ（ポリエチレン）；ＰＰ（ポリプロピレン）；ＴＰＸ（ポリ（４−メチル−１−ペンテン））；ＰＳ（ポリスチレン）；ＰＣ（ポリカーボネート）；ＰＰＥ（ポリフェニレンエーテル）；ＰＢＴ（ポリブチレンテレフタレート）；ナイロン６等のＰＡ（ポリアミド）；ＰＩ（ポリイミド）；ＰＡＩ（ポリアミドイミド）；ＦＥＰ（テトラフルオロエチレン−ヘキサフルオロプロピレンコポリマー）、ＰＦＡ（テトラフルオロエチレン−ペルフルオロエチレンコポリマー）等のフッ素樹脂；ポリエステル系エラストマー、ポリアミド系エラストマー等のエラストマー等が挙げられる。これらの中でも、価格、可撓性、耐熱性、耐寒性等の点から、ポリアミド、ポリエステルエラストマー、ポリ（４−メチル−１−ペンテン）、が好ましい。
本発明において、樹脂は１種であっても２種以上を用いてもよい。
In the present invention, the resin used for the antistatic agent-containing resin composition is preferably a thermoplastic resin, for example, ABS resin (acrylonitrile-butadiene-styrene copolymer); PE (polyethylene); PP (polypropylene); TPX ( Poly (4-methyl-1-pentene)); PS (polystyrene); PC (polycarbonate); PPE (polyphenylene ether); PBT (polybutylene terephthalate); PA (polyamide) such as nylon 6; PI (polyimide); (Polyamideimide); Fluororesin such as FEP (tetrafluoroethylene-hexafluoropropylene copolymer) and PFA (tetrafluoroethylene-perfluoroethylene copolymer); Elastomer such as polyester elastomer and polyamide elastomer And the like. Among these, polyamide, polyester elastomer, and poly (4-methyl-1-pentene) are preferable from the viewpoints of price, flexibility, heat resistance, cold resistance and the like.
In the present invention, the resin may be one type or two or more types.
また、帯電防止剤含有樹脂組成物に用いる帯電防止剤は、当該帯電防止剤含有樹脂組成物で形成されるマンドレルの外周側面の表面抵抗を概ね１×１０１１ Ω（２５℃、５０％ＲＨ）以下にし得るものであれば特に限定なく使用できるが、中でも、永久帯電防止剤が好ましい。本発明において「永久帯電防止剤」とは、界面活性剤タイプの帯電防止剤のような、成形物表面にブリードし、空気中の水分を吸着することにより初めて導電性を発現する帯電防止剤ではなく、それ自体が元々導電性を有する高分子で構成された帯電防止剤のことを指す。 The antistatic agent used in the antistatic agent-containing resin composition has a surface resistance of approximately 1 × 10 11 Ω ( 25 ° C., 50% RH) on the outer peripheral side surface of the mandrel formed of the antistatic agent-containing resin composition. Although it can be used without any limitation as long as it can be made as follows, among them, a permanent antistatic agent is preferable. In the present invention, the term “permanent antistatic agent” refers to an antistatic agent such as a surfactant type antistatic agent that bleeds on the surface of a molded product and exhibits electrical conductivity only by adsorbing moisture in the air. It refers to an antistatic agent that is originally composed of a polymer having conductivity.
上記の永久帯電防止剤は当業者に周知であり、市販品をそのまま使用することができる。例えば、ペレスタット（例えば、ペレスタット３０３、ペレスタット６５００、等）（三洋化成工業社製）等、ハイボロン（ボロンインターナショナル社製）等が挙げられる。 The permanent antistatic agent is well known to those skilled in the art, and a commercially available product can be used as it is. For example, perestat (for example, perestat 303, perestat 6500, etc.) (manufactured by Sanyo Kasei Kogyo Co., Ltd.), high boron (manufactured by Boron International Co., Ltd.), and the like.
本発明において、帯電防止剤含有樹脂組成物における帯電防止剤の配合量は樹脂１００重量部当たり５〜３０重量部が好ましく、より好ましくは１０〜３０重量部、とりわけ好ましくは２０〜３０重量部である。帯電防止剤の配合量が５重量部未満では、マンドレルの外周側面の表面抵抗を十分に小さくすることが困難となり、また、３０重量部を超えると、マンドレルの外周側面の表面抵抗の低抵抗化は頭打ちになり、コスト的に不利になる。また、マンドレルの外周側面での帯電防止剤のブリードアウトが激しくなり、ベース樹脂の特性が阻害される傾向となるため、好ましくない。 In the present invention, the blending amount of the antistatic agent in the antistatic agent-containing resin composition is preferably 5 to 30 parts by weight, more preferably 10 to 30 parts by weight, particularly preferably 20 to 30 parts by weight per 100 parts by weight of the resin. is there. If the blending amount of the antistatic agent is less than 5 parts by weight, it becomes difficult to sufficiently reduce the surface resistance of the outer peripheral side surface of the mandrel. If it exceeds 30 parts by weight, the surface resistance of the outer peripheral side surface of the mandrel is reduced. Will be at the top and cost disadvantageous. Moreover, since the bleed-out of the antistatic agent on the outer peripheral side surface of the mandrel becomes intense and the characteristics of the base resin tend to be inhibited, it is not preferable.
本発明のマンドレルは、その外周側面が帯電防止剤含有樹脂組成物で形成されていればよい。従って、マンドレルは帯電防止剤含有樹脂組成物による単一の成形体であっても、最外層（外周側面を含む）を帯電防止剤含有樹脂組成物による成形体とし、最外層の内側を帯電防止剤含有樹脂組成物による成形体以外の他の部材で構成した多層構造体であってもよい。多層構造体である場合、最外層の内側の部材としては、帯電防止剤を含まない樹脂からなる部材（前記例示の樹脂の成形体）、金属製部材、アラミド繊維等が挙げられる。例えば、マンドレルを金属製ワイヤを内包する多層構造体（すなわち、帯電防止剤含有樹脂組成物からなる筒状成形体の内部貫孔に金属製のワイヤを貫挿したもの）にすることで、成形後のホースからマンドレル（該構造体）を引き抜く際のマンドレルの変形がより生じ難くなり、マンドレルの繰り返し使用回数（耐久性）を向上させることができる。このような金属製ワイヤの材料は特に限定はされないが、ＳＵＳ３０３、ＳＵＳ３０４、ＳＵＳ３１６といったステンレス、亜鉛メッキ鋼等が好適である。また、マンドレルを帯電防止剤を含まない樹脂の成形体による内層と、帯電防止剤含有樹脂組成物の成形体による外層とで構成することで、マンドレル全体当たりに使用する帯電防止剤の使用量を減じることができ、材料コストを低く抑えることができる。なお、マンドレルの製造作業の点からは、マンドレルは帯電防止剤含有樹脂組成物による単一の成形体にするのが好ましい。 As for the mandrel of this invention, the outer peripheral side surface should just be formed with the antistatic agent containing resin composition. Therefore, even if the mandrel is a single molded body made of an antistatic agent-containing resin composition, the outermost layer (including the outer peripheral surface) is made of a molded body made of an antistatic agent-containing resin composition, and the inner side of the outermost layer is antistatic. It may be a multilayer structure composed of other members than the molded body made of the agent-containing resin composition. In the case of a multilayer structure, examples of the member inside the outermost layer include a member made of a resin that does not contain an antistatic agent (molded body of the above-mentioned resin), a metal member, an aramid fiber, and the like. For example, by forming a mandrel into a multilayer structure containing a metal wire (that is, a metal wire inserted into an internal through hole of a cylindrical molded body made of an antistatic agent-containing resin composition), Deformation of the mandrel when pulling out the mandrel (the structure) from the later hose is less likely to occur, and the number of repeated use (durability) of the mandrel can be improved. The material of such a metal wire is not particularly limited, but stainless steel such as SUS303, SUS304, and SUS316, galvanized steel, and the like are preferable. Moreover, the amount of the antistatic agent used per mandrel as a whole can be reduced by configuring the mandrel with an inner layer formed of a resin molded body not containing an antistatic agent and an outer layer formed of a molded body of an antistatic agent-containing resin composition. This can reduce the material cost. From the viewpoint of mandrel manufacturing work, the mandrel is preferably formed into a single molded body made of an antistatic agent-containing resin composition.
本発明のマンドレルにおいては、前記の通り、帯電防止剤含有樹脂組成物で形成される外周側面の表面抵抗が１×１０１１ Ω（２５℃、５０％ＲＨ）以下であることが重要である。すなわち、外周側面の表面抵抗が１×１０１１ Ω（２５℃、５０％ＲＨ）より大きくなると、十分な離型剤の凝集防止作用が得られ難くなる。なお、帯電防止剤含有樹脂組成物で形成される外周側面の表面抵抗は５×１０１０ Ω（２５℃、５０％ＲＨ）以下であるのが好ましく、１×１０１０ Ω（２５℃、５０％ＲＨ）以下であるのがより好ましい。なお、帯電防止剤含有樹脂組成物で形成される外周側面の表面抵抗は低ければ低いほど好ましいが、帯電防止剤をベース樹脂の特性を阻害しない範囲で含有させて達成し得る外周側面の表面抵抗は１×１０７ Ω（２５℃、５０％ＲＨ）程度が限界である。 In the mandrel of the present invention, as described above, it is important that the surface resistance of the outer peripheral side surface formed of the antistatic agent-containing resin composition is 1 × 10 11 Ω ( 25 ° C., 50% RH) or less. That is, when the surface resistance of the outer peripheral side surface is greater than 1 × 10 11 Ω ( 25 ° C., 50% RH), it is difficult to obtain a sufficient anti-aggregation effect of the release agent. The surface resistance of the outer peripheral side surface formed of the antistatic agent-containing resin composition is preferably 5 × 10 10 Ω ( 25 ° C., 50% RH) or less, preferably 1 × 10 10 Ω ( 25 ° C., 50%). RH) or less is more preferable. The surface resistance of the outer peripheral side surface formed from the antistatic agent-containing resin composition is preferably as low as possible. However, the surface resistance of the outer peripheral side surface that can be achieved by including an antistatic agent in a range that does not impair the characteristics of the base resin. Is about 1 × 10 7 Ω ( 25 ° C., 50% RH).
本発明において、帯電防止剤含有樹脂組成物には、帯電防止剤以外の他の添加剤を配合してもよい。例えば、充填材として、ガラス繊維、タルク、二硫化モリブデン、炭酸カルシウム等の無機フィラーを配合することができる。該無機フィラーの配合量は樹脂１００重量部当たり３０重量部以下が好ましく、より好ましくは５〜２０重量部である。 In this invention, you may mix | blend other additives other than an antistatic agent with an antistatic agent containing resin composition. For example, an inorganic filler such as glass fiber, talc, molybdenum disulfide, or calcium carbonate can be blended as the filler. The blending amount of the inorganic filler is preferably 30 parts by weight or less, more preferably 5 to 20 parts by weight per 100 parts by weight of the resin.
本発明のマンドレルの形状は、製造すべきホースの内部貫孔の断面形状（軸線と直交する平面で切った断面の形状）に対応させて種々変更される。例えば、内部貫孔の断面形状が円形の一般的なホースの製造用である場合は、マンドレルの形状は円柱状（または円筒状）にし、内部貫孔の断面の形状が多角形等の異形ホースの製造用である場合は、マンドレルの形状は多角柱状（または多角筒状）等にすればよい。また、マンドレルの大きさ（断面径、全長（軸線方向の長さ）等）は製造するホースの断面の外径、全長（軸線方向の長さ）等に合せて適宜設定される。 The shape of the mandrel of the present invention is variously changed in accordance with the cross-sectional shape of the internal through hole of the hose to be manufactured (the cross-sectional shape cut by a plane orthogonal to the axis). For example, if the internal through hole is used for manufacturing a general hose having a circular cross section, the mandrel has a cylindrical shape (or a cylindrical shape) and the internal through hole has a cross section having a polygonal shape. In the case of manufacturing, the shape of the mandrel may be a polygonal column (or a polygonal cylinder) or the like. Further, the size (cross-sectional diameter, total length (length in the axial direction), etc.) of the mandrel is appropriately set according to the outer diameter, total length (length in the axial direction) of the hose to be manufactured.
本発明のマンドレルは、例えば、樹脂に帯電防止剤を配合し、さらに必要に応じてその他の添加剤を配合し、それらを、例えば、ニーダー、バンバリーミキサー等の混練機で混練し、混練物を射出成形機、押出成形機等の公知の成形装置を用いて所望の形状に成形することによって作製される。なお、マンドレルを金属製ワイヤを内包する多層構造体にする場合、例えば、金属製ワイヤを挿入した金型を使用するインサート成形を行うか、或いは、金属製ワイヤの外周側面に混練物を押出す等の方法が採用される。 The mandrel of the present invention is prepared, for example, by blending an antistatic agent with a resin, and further blending other additives as necessary, and kneading them with a kneader such as a kneader or a Banbury mixer. It is produced by molding into a desired shape using a known molding apparatus such as an injection molding machine or an extrusion molding machine. In addition, when making the mandrel into a multilayer structure including a metal wire, for example, insert molding using a mold in which the metal wire is inserted is performed, or a kneaded product is extruded on the outer peripheral side surface of the metal wire. Etc. are employed.
本発明のマンドレルは、例えば、ニトリルゴム（アクリロニトリル−ブタジエンゴム）、水素化ニトリルゴム、フッ素ゴム、シリコンゴム、アクリルゴム、エチレン−プロピレンゴム、オレフィン系ゴム等を原料とする種々のゴムホースの製造用として好適であるが、樹脂やエラストマーからなるホースの製造にも使用できる。 The mandrel of the present invention is used for manufacturing various rubber hoses made of, for example, nitrile rubber (acrylonitrile-butadiene rubber), hydrogenated nitrile rubber, fluorine rubber, silicon rubber, acrylic rubber, ethylene-propylene rubber, olefin rubber and the like. However, it can also be used for the production of hoses made of resin or elastomer.
ホース製造時、本発明のマンドレルの外周側面に塗布する離型剤は特に限定されず、従来からのこの種の離型剤として使用されている、ノニオン型界面活性剤やノニオン型とアニオン型の界面活性剤の混合剤、ジメチルシリコーン、変性シリコーンオイル等のシリコーン類、ノニオン型界面活性剤とシリコーン類との混合剤等やフッ素系の離型剤等を制限なく使用できるが、揮発性溶媒に離型性粒子を分散させた分散液（乳化分散液）タイプの離型剤を用いる場合に、本発明のマンドレルが有する離型剤の凝集防止効果がより顕著に発揮される。このような分散液タイプの離型剤としては、水、ポリエーテルやポリエーテル含有ポリマーの粒子（ビーズ）及び金属石鹸（ノニオン）等を含む乳化分散液等が挙げられ、具体的には、ニューエイド（例えば、ニューエイドＸＬ−２２）（精工化学株式会社製）を挙げることができる。 The release agent applied to the outer peripheral side surface of the mandrel of the present invention at the time of producing the hose is not particularly limited, and is used as a conventional release agent of this type, such as a nonionic surfactant or a nonionic surfactant and a nonionic surfactant. Surfactant admixtures, silicones such as dimethyl silicone and modified silicone oil, nonionic surfactant / silicone admixtures, fluorine release agents, etc. can be used without limitation. In the case of using a dispersion (emulsified dispersion) type release agent in which release particles are dispersed, the effect of preventing aggregation of the release agent of the mandrel of the present invention is more remarkably exhibited. Examples of such a dispersion type mold release agent include emulsified dispersion liquid containing water, particles of polyether or polyether-containing polymer (beads), metal soap (nonion), and the like. Aid (for example, New Aid XL-22) (manufactured by Seiko Chemical Co., Ltd.) can be mentioned.
本明細書において、マンドレルの外周側面の表面抵抗（値）は、２５℃、５０％ＲＨの環境下、表面抵抗計Ｈｉｒｅｓｔａ−ＵＰ（型式：ＭＣＰ−ＨＴ４５０）（三菱化学社製）を使用して測定した値である。なお、測定開始直後（印加直後）は値が安定しないので、測定開始（引加して）から１０秒の後の値を表面抵抗値（Ω）とした。 In this specification, the surface resistance (value) of the outer peripheral side surface of the mandrel is measured using a surface resistance meter HIRESTA-UP (model: MCP-HT450) (manufactured by Mitsubishi Chemical Corporation) in an environment of 25 ° C. and 50% RH. It is a measured value. Since the value was not stable immediately after the start of measurement (immediately after application), the value 10 seconds after the start of measurement (addition) was taken as the surface resistance value ( Ω) .
以下、実施例及び比較例を示して本発明をより具体的に説明する。なお、本発明は下記の実施例によって限定されるものではない。 Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. In addition, this invention is not limited by the following Example.
実施例１
ＴＰＸ ＭＸ００１（ポリ（４−メチル−１−ペンテン）：三井化学社製）１００重量部にペレスタット３０３（三洋化成社製の永久帯電防止剤）を２０重量部をドライブレンドし、該混合物を混練し、押出成形して直径９．４ｍｍ、全長５０ｍの円柱状成形体（マンドレル）を作製した。この円柱状成形体（マンドレル）の外周側面の表面抵抗を測定したところ、３×１０１０ Ω（２５℃、５０％ＲＨ）であった。
次に、この円柱状成形体（マンドレル）の外周側面に水分散液型の離型剤（ニューエイドＸＬ−２（精工化学株式会社製））を０．５ｇ／ｍ２塗布し、塗布から１０秒経過後の外周側面における離型剤の状態を目視観察したところ、塊状の凝集部はなく、均一に拡がって保持されていた。
次に、エチレン−プロピレン−ジエン共重合ゴムと加硫剤（ジクミルパーオキサイド）とを含むゴムホース用原料混練物を、円柱状成形体（マンドレル）の外周側面上に肉厚４ｍｍに押出し、それから１９０℃の加硫装置内で２分加硫してホースを成形した。そして、ホースから円柱状成形体（マンドレル）を引抜き、その際の離型性（引抜き性）を下記の方法で評価した。
Example 1
TPX MX001 (poly (4-methyl-1-pentene): 100 parts by weight of Mitsui Chemicals) was dry blended with 20 parts by weight of Pelestat 303 (permanent antistatic agent made by Sanyo Chemical Co., Ltd.), and the mixture was kneaded. A cylindrical shaped body (mandrel) having a diameter of 9.4 mm and a total length of 50 m was produced by extrusion molding. When the surface resistance of the outer peripheral side surface of this cylindrical molded body (mandrel) was measured, it was 3 × 10 10 Ω ( 25 ° C., 50% RH).
Next, 0.5 g / m 2 of an aqueous dispersion type mold release agent (New Aid XL-2 (manufactured by Seiko Chemical Co., Ltd.)) was applied to the outer peripheral side surface of the cylindrical molded body (mandrel), and 10 times from the application. Visual observation of the state of the release agent on the outer peripheral side surface after a lapse of seconds revealed that there was no lump-like agglomerated portion, and it was uniformly spread and held.
Next, a rubber hose raw material kneaded material containing ethylene-propylene-diene copolymer rubber and a vulcanizing agent (dicumyl peroxide) is extruded to a thickness of 4 mm on the outer peripheral side surface of a cylindrical molded body (mandrel), and then A hose was formed by vulcanization in a vulcanizer at 190 ° C. for 2 minutes. And the cylindrical molded object (mandrel) was pulled out from the hose, and the mold release property (pullability) in that case was evaluated by the following method.
比較例１
ＴＰＸ ＭＸ００１（ポリ（４−メチル−１−ペンテン）：三井化学社製）をそのまま押出成形して直径９．４ｍｍ、全長５０ｍの円柱状成形体（マンドレル）を作製した。この円柱状成形体（マンドレル）の外周側面の表面抵抗を測定したところ、１×１０１１ Ω（２５℃、５０％ＲＨ）を超え、測定不能であった。
次に、この円柱状成形体（マンドレル）の外周側面に実施例１で使用した水分散液型の離型剤を０．５ｇ／ｍ２塗布し、塗布から１０秒経過後の外周側面における離型剤の状態を、目視観察したところ、部分的に塊状の凝集部（大きさ（直径）が約５ｍｍ）が形成されていた。
次に、実施例１で用いたゴムホース用原料混練物と同じものを使用し、実施例１と同様にして押出し、加硫を行い、ホースを成形した。そして、ホースから円柱状成形体（マンドレル）を引抜き、その際の離型性（引抜き性）を下記の方法で評価した。
Comparative Example 1
TPX MX001 (poly (4-methyl-1-pentene): manufactured by Mitsui Chemicals Inc.) was extruded as it was to produce a cylindrical shaped body (mandrel) having a diameter of 9.4 mm and a total length of 50 m. When the surface resistance of the outer peripheral side surface of this cylindrical molded body (mandrel) was measured, it exceeded 1 × 10 11 Ω ( 25 ° C., 50% RH) and was not measurable.
Next, 0.5 g / m 2 of the aqueous dispersion type release agent used in Example 1 was applied to the outer peripheral side surface of the cylindrical molded body (mandrel), and the release was performed on the outer peripheral side surface after 10 seconds had elapsed from the application. As a result of visual observation of the state of the mold, a partially aggregated part (size (diameter) of about 5 mm) was partially formed.
Next, the same material kneaded material for rubber hose used in Example 1 was used, extruded in the same manner as in Example 1, vulcanized, and a hose was molded. And the cylindrical molded object (mandrel) was pulled out from the hose, and the mold release property (pullability) in that case was evaluated by the following method.
実施例２
ハイトレル４７７７（ポリエステル系エラストマー：東レ・デュポン社製）１００重量部にペレスタット６５００（三洋化成社製の永久帯電防止剤）２５重量部をドライブレンドし、該混合物を混練し、押出成形して、直径９．４ｍｍ、全長５０ｍの円柱状成形体（マンドレル）を作製した。この円柱状成形体（マンドレル）の外周側面の表面抵抗を測定したところ、５×１０８ Ω（２５℃、５０％ＲＨ）であった。
次に、この円柱状成形体（マンドレル）の外周側面に実施例１で使用した水分散液型の離型剤を０．５ｇ／ｍ２塗布し、塗布から１０秒経過後の該外周側面における離型剤の状態を、目視観察したところ、塊状の凝集部はなく、均一に拡がって保持されていた。
次に、実施例１で使用したゴムホース用原料混練物と同じものを使用し、円柱状成形体（マンドレル）の外周側面上に肉厚４ｍｍに押出し、それから１９０℃の加硫装置内で２分加硫してホースを成形した。そして、ホースから円柱状成形体（マンドレル）を引抜き、その際の離型性（引抜き性）を下記の方法で評価した。
Example 2
Hytrel 4777 (polyester elastomer: manufactured by Toray DuPont) 100 parts by weight of Pelestat 6500 (Sanyo Kasei permanent antistatic agent) 25 parts by dry blend, the mixture is kneaded, extruded, A cylindrical shaped body (mandrel) having a length of 9.4 mm and a total length of 50 m was produced. When the surface resistance of the outer peripheral side surface of this cylindrical molded body (mandrel) was measured, it was 5 × 10 8 Ω ( 25 ° C., 50% RH).
Next, 0.5 g / m 2 of the aqueous dispersion type release agent used in Example 1 was applied to the outer peripheral side surface of the cylindrical molded body (mandrel), and the outer peripheral side surface after 10 seconds had elapsed from the application. When the state of the release agent was visually observed, there was no lump-like agglomerated part, and it was spread and held uniformly.
Next, the same material kneaded material for rubber hose used in Example 1 was used, extruded on the outer peripheral side surface of a cylindrical molded body (mandrel) to a thickness of 4 mm, and then 2 minutes in a vulcanizer at 190 ° C. Vulcanized to form a hose. And the cylindrical molded object (mandrel) was pulled out from the hose, and the mold release property (pullability) in that case was evaluated by the following method.
比較例２
ハイトレル４７７７（ポリエステル系エラストマー：東レ・デュポン社製）をそのまま射出成形して直径９．４ｍｍ、全長５０ｍの円柱状成形体（マンドレル）を作製した。この円柱状成形体（マンドレル）の外周側面の表面抵抗を測定したところ、１×１０１１ Ω（２５℃、５０％ＲＨ）を超え、測定不能であった。
次に、この円柱状成形体（マンドレル）の外周側面に実施例１で使用した水分散液型の離型剤を０．５ｇ／ｍ２塗布し、塗布から１０秒経過後の該外周側面における離型剤の状態を、目視観察したところ、部分的に塊状の凝集部（大きさ（直径）が約５ｍｍ）が形成されていた。
次に、実施例１で用いたゴムホース用原料混練物と同じものを使用し、実施例１と同様にして押出し、加硫を行い、ホースを成形した。そして、ホースから円柱状成形体（マンドレル）を引抜き、その際の離型性（引抜き性）を下記の方法で評価した。
Comparative Example 2
Hytrel 4777 (polyester elastomer: manufactured by Toray DuPont) was directly injection molded to produce a cylindrical molded body (mandrel) having a diameter of 9.4 mm and a total length of 50 m. When the surface resistance of the outer peripheral side surface of this cylindrical molded body (mandrel) was measured, it exceeded 1 × 10 11 Ω ( 25 ° C., 50% RH) and was not measurable.
Next, 0.5 g / m 2 of the aqueous dispersion type release agent used in Example 1 was applied to the outer peripheral side surface of the cylindrical molded body (mandrel), and the outer peripheral side surface after 10 seconds had elapsed from the application. When the state of the release agent was visually observed, a partially aggregated aggregate (size (diameter) of about 5 mm) was formed.
Next, the same material kneaded material for rubber hose used in Example 1 was used, extruded in the same manner as in Example 1, vulcanized, and a hose was molded. And the cylindrical molded object (mandrel) was pulled out from the hose, and the mold release property (pullability) in that case was evaluated by the following method.
［マンドレルの引抜き性評価］
図１に示すように、成形後のマンドレル１が挿入されたままのホース２を５０ｃｍに切断し、マンドレル１の片端にフック３を取り付け、治具４でホースを押さえ、この状態で、オートグラフでホース２からマンドレル１を引き抜いたときの、引抜き力が３０Ｎ以下であれば合格とし、３０Ｎより大きい場合は不合格とした。
[Evaluation of pullability of mandrel]
As shown in FIG. 1, the hose 2 with the molded mandrel 1 still inserted is cut to 50 cm, a hook 3 is attached to one end of the mandrel 1, the hose is pressed with a jig 4, and in this state, the autograph When the mandrel 1 was pulled out of the hose 2 with a pulling force of 30 N or less, the test was accepted.
実施例１のマンドレルの引抜き力は２０Ｎ、比較例１のマンドレルの引抜き力は４０Ｎ、実施例２のマンドレルの引抜き力は３０Ｎ、比較例２のマンドレルの引抜き力は５０Ｎであった。 The pulling force of the mandrel of Example 1 was 20 N, the pulling force of the mandrel of Comparative Example 1 was 40 N, the pulling force of the mandrel of Example 2 was 30 N, and the pulling force of the mandrel of Comparative Example 2 was 50 N.
以上の結果から、本発明のマンドレルでは、その外周側面に離型剤を塗布すると離型剤が凝集せずに均一に拡がって保持されることから、本発明のマンドレルを使用してホースを成形すると、マンドレルとホースとの固着を防止でき、マンドレルをホースから引き抜く際の引抜き力を十分に小さくできることが分かった。 From the above results, in the mandrel of the present invention, when the release agent is applied to the outer peripheral side surface, the mold release agent is uniformly spread without being agglomerated, and thus the hose is formed using the mandrel of the present invention. Then, it was found that the mandrel and the hose can be prevented from sticking, and the pulling force when pulling the mandrel from the hose can be made sufficiently small.
１ マンドレル
２ ホース
３ フック
４ 治具
1 Mandrel 2 Hose 3 Hook 4 Jig
Claims (4)
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| Application Number | Priority Date | Filing Date | Title |
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| JP2004357433A JP4733972B2 (en) | 2004-12-09 | 2004-12-09 | Mandrel |
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| JP2004357433A JP4733972B2 (en) | 2004-12-09 | 2004-12-09 | Mandrel |
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| JP4733972B2 true JP4733972B2 (en) | 2011-07-27 |
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| JPS6127213A (en) * | 1984-07-18 | 1986-02-06 | Mitsui Petrochem Ind Ltd | Mandrel for preparation of rubber hose |
| JP2000094452A (en) * | 1998-09-22 | 2000-04-04 | Toyobo Co Ltd | Mandrel |
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