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WO2010071130A1 - 可撓性耐圧・耐油ホース - Google Patents

可撓性耐圧・耐油ホース Download PDF

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Publication number
WO2010071130A1
WO2010071130A1 PCT/JP2009/070906 JP2009070906W WO2010071130A1 WO 2010071130 A1 WO2010071130 A1 WO 2010071130A1 JP 2009070906 W JP2009070906 W JP 2009070906W WO 2010071130 A1 WO2010071130 A1 WO 2010071130A1
Authority
WO
WIPO (PCT)
Prior art keywords
resistant
oil
hard core
main body
hose
Prior art date
Application number
PCT/JP2009/070906
Other languages
English (en)
French (fr)
Inventor
茂樹 金尾
Original Assignee
カナフレックスコーポレーション株式会社
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 カナフレックスコーポレーション株式会社 filed Critical カナフレックスコーポレーション株式会社
Priority to EP09833433A priority Critical patent/EP2378175A1/en
Priority to US13/140,570 priority patent/US20110247714A1/en
Priority to CN2009801513401A priority patent/CN102257305A/zh
Priority to JP2010542974A priority patent/JPWO2010071130A1/ja
Publication of WO2010071130A1 publication Critical patent/WO2010071130A1/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/11—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall
    • F16L11/115—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall having reinforcements not embedded in the wall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/02—Layer formed of wires, e.g. mesh
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/08—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall
    • F16L11/081—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall comprising one or more layers of a helically wound cord or wire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/08—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall
    • F16L11/088—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements embedded in the wall comprising a combination of one or more layers of a helically wound cord or wire with one or more braided layers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/11—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall
    • F16L11/112—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall having reinforcements embedded in the wall
    • B—PERFORMING OPERATIONS; TRANSPORTING
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Definitions

  • the present invention relates to a flexible pressure / oil resistant hose which can be reduced in weight and cost and has excellent durability.
  • a flexible hose used for guiding gas and liquid or granules and powders such as a hose that guides circulation of muddy water and food liquid, in addition to hoses that guide granules and powders
  • a cylindrical soft main body portion 102 having a substantially flat inner surface, and a spiral hard core portion 103 partly or entirely embedded in the main body portion 102 to reinforce the main body portion.
  • the hard core part 103 is composed mainly of hard polypropylene, mixed with hard polyethylene, etc.
  • the main body part 102 is made of olefin elastomer mixed with EVA resin.
  • a pressure hose 101 is provided (see, for example, Patent Document 1). ).
  • a main body portion 102 having a substantially flat inner surface and the main body portion 102 are obtained as a result of further improving the bonding performance between the main body portion and the hard core portion and obtaining a sufficient flat strength.
  • the main body portion 102 is provided with a helical hard core portion 103 partially or entirely embedded, the hard core portion 103 is made of hard polypropylene, and the main body portion 102 is made of olefin.
  • a flexible pressure-resistant hose 101 is provided in which an EVA resin and polypropylene are mixed into a thermoplastic elastomer (see, for example, Patent Document 2).
  • the fluidity of the molten material can be improved, which is advantageous in terms of molding (manufacturing) and can further increase flexibility.
  • the hose has a substantially flat outer surface, not only can the dust adherence volume be prevented, but also the outer surface can be easily wiped off.
  • these flexible pressure-resistant hoses do not have oil resistance on the inner surface, and cannot transport oily fluids such as waste oil and kerosene.
  • an outer peripheral wall made of a soft resin material such as soft vinyl chloride is integrally joined to an inner peripheral wall made of a rubber material.
  • a hard core material such as hard vinyl chloride is firmly fixed to the outer peripheral wall portion made of soft resin without being in close contact with the inner peripheral wall portion made of rubber, thereby enabling high-pressure transportation of crude oil and heavy oil.
  • the thing of the structure which was made is proposed (for example, refer patent document 3).
  • such an inner peripheral wall portion made of rubber and an outer peripheral wall portion made of synthetic resin have poor compatibility, and sufficient adhesion cannot be obtained, resulting in problems in pressure resistance and durability.
  • the conventional flexible pressure / oil resistant hose is made of an oil resistant rubber material having weather resistance with respect to the inner peripheral wall portion 121 made of an oil resistant rubber material.
  • the outer peripheral wall portion 122 is brought into close contact with each other via the mesh portion 104 made of a reinforcing cord, and a hard core portion 103 made of a hard synthetic resin such as hard vinyl chloride is spirally wound around and attached to the outer surface of the outer peripheral wall portion.
  • a hard core portion 103 made of a hard synthetic resin such as hard vinyl chloride is spirally wound around and attached to the outer surface of the outer peripheral wall portion.
  • the rubber material is heavier than the synthetic resin material, and the hose in FIG. 6 in which the peripheral wall portions 121 and 122 made of the rubber material are laminated is heavy, and the weight is reduced from the viewpoint of improving workability during transportation and construction. Was demanded. Further, a rubber material having weather resistance is necessary for the outer peripheral wall portion, which has been a cause of cost increase.
  • the present invention is to provide a flexible pressure / oil resistant hose that is excellent in durability and pressure resistance and can be reduced in weight and cost. .
  • the present invention provides a soft main body portion whose inner surface is substantially flat, and a helical hard core material provided on or inside the outer surface of the soft main body portion to reinforce the soft main body portion.
  • a flexible pressure-resistant / oil-resistant hose characterized in that the soft main body is made of an oil-resistant thermoplastic elastomer.
  • a net-like portion made of a large number of reinforcing yarns is provided in the soft main body portion, and the hard core portion is spirally attached on the outer surface of the soft main body portion.
  • the hard core portion is made of a metal wire, the hard core portion is attached to the outer surface of the soft main body portion, and an outer covering layer made of a thermoplastic elastomer is provided on the outer surface side.
  • an outer covering layer made of a thermoplastic elastomer is provided on the outer surface side.
  • the hard core portion is provided inside the soft main body portion, and an inner coating layer made of an oil-resistant thermoplastic elastomer is provided so as to close the inner surface thereof.
  • the soft main body is made of an oil resistant thermoplastic elastomer, so that the weight can be reduced compared with the conventional rubber one (the specific gravity is small).
  • the weight is reduced by about 5 to 30%.
  • the workability during handling and construction can be improved.
  • it has excellent weather resistance, and it is not necessary to use expensive weather-resistant rubber, and it is not necessary to have a two-layer structure of a rubber layer and a resin layer, so that the cost can be reduced.
  • the hard core portion is made of a metal wire, an antistatic effect can be obtained.
  • (A), (b) is a partially broken side view which shows the flexible pressure
  • FIG. 1 is a partially broken side view showing a first embodiment of a flexible pressure / oil resistant hose according to the present invention
  • FIG. 2 shows a second embodiment
  • FIG. 3 shows a third embodiment.
  • Reference numeral 1 denotes a flexible pressure / oil resistant hose
  • 2 denotes a soft main body
  • 3 denotes a hard core part.
  • the flexible pressure / oil resistant hose 1 of the present invention has a soft main body portion 2 whose inner surface is substantially flat and an outer surface of the soft main body portion 2 for reinforcing the soft main body portion 2. Or it comprises the helical hard core part 3 provided in an inside, and the soft main-body part 2 consists of an oil-resistant thermoplastic elastomer, It is characterized by the above-mentioned.
  • thermoplastic elastomers excellent in oil resistance such as olefin elastomer, acrylic olefin elastomer, polyamide elastomer, polyester elastomer, polyurethane elastomer, vinyl chloride elastomer can be used.
  • a thermoplastic resin such as a mixture of polypropylene resin or polyethylene resin can also be used.
  • the flexible pressure / oil resistant hose 1 has a hard core portion 3 spirally attached on the outer surface of a soft main body portion 2 made of an oil resistant thermoplastic elastomer.
  • a net-like part 4 made of a large number of reinforcing yarns such as aramid fiber, vinylon fiber, nylon fiber, polyester fiber is provided inside the soft main body 2 It has been.
  • the hard core part 3 of this embodiment consists of hard synthetic resins, such as polyolefin resin, and what added the powdery or fibrous filler for reinforcement is more preferable.
  • the polyolefin resin for example, a polypropylene resin or a polyethylene resin can be used.
  • a cloth yarn is arranged as a net-like part 4 on an inner layer 20 made of an oil-resistant thermoplastic elastomer, and an outer side also made of an oil-resistant thermoplastic elastomer on the outside thereof.
  • the hard core portion 3 that is configured by laminating the layers 21 and wound further on the outer peripheral side by the outer layer 21 is held.
  • the net-like part 4 those conventionally used for known pressure-resistant hoses can be widely applied.
  • two reinforcing yarns 51 and two metal wires 52 are provided in parallel along the central portion of the bottom surface of the hard core portion 3, and the expansion to the outside of the hose can be suppressed.
  • the presence of the metal wire 52 has an effect of preventing static electricity as a ground wire.
  • a steel wire, a copper wire, or the like can be used.
  • the fiber of the reinforcing yarn 5 the same fiber as that of the mesh portion 4 may be adopted. In this example, both the reinforcing thread 51 and the metal wire 52 are provided. However, only one of them may be provided.
  • the flexible pressure resistant / oil resistant hose 1 further includes a hard core portion 3 made of a metal wire, and the outer side of the soft main body portion 2 having the hard core portion 3 made of the metal wire arranged on the outer surface.
  • An outer coating layer 6 made of a thermoplastic elastomer is provided.
  • the metal wire a steel wire, a copper wire, or the like can be used, and by providing such a metal wire, it has an antistatic effect.
  • the hard core portion 3 may be a bare wire made of only a metal wire, but in this example, it is a covered wire in which the outer surface of the metal wire 30 is covered with a thermoplastic elastomer layer 31.
  • the thermoplastic elastomer layer 31 has compatibility with the soft main-body part 2 and the outer side coating layer 6 which consist of a thermoplastic elastomer, respectively, and adhesiveness will improve.
  • the thermoplastic elastomer used for the outer coating layer 6 is preferably an abrasion-resistant thermoplastic elastomer.
  • a mixture containing a water-added polystyrene-based thermoplastic elastomer and a polyolefin-based resin, a polyurethane-based thermoplastic elastomer, a polyamide A system elastomer, a polyester system elastomer, etc. can be used.
  • the hydrogenated polystyrene-based thermoplastic elastomer a styrene-ethylene butylene-styrene block copolymer or the like can be used, and as the polyolefin resin to be mixed, a polypropylene resin or a polyethylene resin can be used.
  • a synthetic resin for example, a polyolefin resin can be used, or a polyvinyl chloride resin can be used.
  • the flexible pressure / oil resistant hose 1 includes a hard core portion 3 made of a hard synthetic resin such as a polyolefin resin, and is made of an oil resistant thermoplastic elastomer. This is provided inside the soft main body 2. More specifically, the hose has a substantially flat inner and outer surfaces in which the soft main body portion 2 and the hard core portion 3 having substantially the same thickness extending in a spiral shape are alternately joined along the longitudinal direction.
  • the hose having such a structure can be obtained by winding the tape of the soft main body part 2 and the hard core part 3 at the same time by continuously melting and extruding, spirally wound around the rotating shaft, and sequentially welding. For example, before and after the tape part of the hard core part 3, a substantially half part of the tape part of the soft main body part 2 is integrally wound and spirally wound so that substantially half of the tape part of the soft main body part 3 is Can be sequentially welded.
  • FIG. 3B shows a modified example in which an inner coating layer 7 made of an oil-resistant thermoplastic elastomer is provided so as to further block the inner surface.
  • an inner coating layer 7 made of an oil-resistant thermoplastic elastomer is provided so as to further block the inner surface.
  • the hard core portion 3 is exposed on the inner surface and there is a concern about oil resistance.
  • an oil-resistant inner coating layer 7 is provided. Can be solved.
  • Test specimens of the innermost layer (soft body part / inner peripheral wall part) of each hose of Example 1 and Comparative Examples 1 and 2 were prepared, and for gasoline, kerosene and cutting oil, JIS K-6258 “Vulcanized Rubber Physical Test Method”, respectively.
  • the immersion test was conducted under the conditions of a temperature of 22 ° C. and 168 hours, and the mass change rate before and after this test was measured.
  • the mass change rate of each specimen is shown in Table 1 below.
  • Example 1 of the present invention has oil resistance equivalent to that of the inner peripheral wall portion (oil resistant rubber material) of the conventional flexible pressure resistant / oil resistant hose of Comparative Example 1. It can be seen that oily fluid can also be conveyed. In particular, gasoline has higher oil resistance. On the other hand, it can be seen that the conventional flexible pressure-resistant hose of Comparative Example 2 lacks oil resistance and cannot convey oily fluid.

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Abstract

【課題】耐久性・耐圧性に優れるとともに軽量化・低コスト化を図ることができる可撓性耐圧・耐油ホースを提供せんとする。 【解決手段】内面がほぼフラットの軟質本体部２と、この軟質本体部２の補強を行うために該軟質本体部２の外面上または内部に設けられる螺旋状の硬質芯材部３とを備え、軟質本体部２が耐油性の熱可塑性エラストマーよりなる。軟質本体部２内に多数の補強糸からなる網状部４を設け、硬質芯材部３を軟質本体部２の外面上に螺旋状に付設したものや、とくに硬質芯材部３が金属線よりなり、軟質本体部２の外面に硬質芯材部３を付設し、その外面側に耐摩耗性の熱可塑性エラストマーよりなる外側被覆層６を設けたもの、硬質芯材部３を軟質本体部２の内部に設け、その内側面を塞ぐように同じく耐油性の熱可塑性エラストマーよりなる内側被覆層７を設けたもの等の構造とすることができる。

Description

可撓性耐圧・耐油ホース
　本発明は、軽量化、低コスト化が図れ、かつ耐久性に優れた可撓性耐圧・耐油ホースに関する。
　従来、粒体や粉体を案内するホースの他、泥水や食品用液体などを流通案内するホースなど、気体や液体あるいは粒体や粉体を案内するものに用いられる可撓性ホースとして、図４に示すように、内面がほぼフラットで筒状の軟質本体部１０２と、この本体部の補強を行うために該本体部１０２に一部又は全部が埋設された螺旋状の硬質芯材部１０３とを備え、硬質芯材部１０３が硬質のポリプロピレンを主成分とし、これに硬質のポリエチレン等を混合したものであり、本体部１０２がオレフィン系エラストマーにＥＶＡ樹脂を混合したものである可撓性耐圧ホース１０１が提供されている（例えば、特許文献１参照。
）。
　また、本体部と硬質芯材部との更なる接着性能を向上させ、十分な偏平強度が得られるものとして、図５に示すように、内面がほぼフラットの本体部１０２と、この本体部１０２の補強を行うために該本体部１０２に一部又は全部が埋設された螺旋状の硬質芯材部１０３とを備え、硬質芯材部１０３が硬質のポリプロピレンからなり、本体部１０２が、オレフィン系熱可塑性エラストマーにＥＶＡ樹脂およびポリプロピレンを混合したものである可撓性耐圧ホース１０１が提供されている（例えば、特許文献２参照。）。このように本体部１０２にＥＶＡ樹脂を混合することで、溶融状態の材料の流動性の改善を行うことができ、成形上（製造上）において有利になるとともに、可撓性をより高めることができ、外面略フラットのホースに構成したので、塵の付着体積を防止することができるだけでなく、外面の拭き取り作業を容易に行うことができるものである。
　ところで、これら可撓性耐圧ホースは、内側面に耐油性を備えておらず、廃油や灯油などの油性流体を搬送することはできなかった。耐油性をも兼ね備えた可撓性耐圧・耐油ホースとしては、従来、ゴム材料から構成された内側周壁部に対し、軟質塩化ビニル等の軟質樹脂材料から構成された外側周壁部を一体的に接合し、かつこの軟質樹脂製の外側周壁部に硬質塩化ビニル等の硬質芯材部を、ゴム製内側周壁部に対して密着しない状態で固着保持させ、これにより原油や重油の高圧輸送も可能とした構造のものが提案されている（例えば、特許文献３参照。）。しかしながら、このようなゴム製の内側周壁部と合成樹脂製の外側周壁部とは相溶性が悪く、密着性が十分に得られず、耐圧性および耐久性に問題があった。
　そこで、従来の可撓性耐圧・耐油ホースは、図６に示すように、耐油性のゴム材料から構成された内側周壁部１２１に対し、耐候性を兼ね備えた耐油性のゴム材料から構成された外側周壁部１２２を補強コードよりなる網状部１０４を介して互いに密着させ、かつこの外側周壁部の外面に硬質塩化ビニル等の硬質合成樹脂製の硬質芯材部１０３を螺旋状に巻き付けて付着させた構成のものが提供されている。これにより同じゴム製の内外の周壁部１２１、１２２の密着性が十分に得られるとともに、網状部１０４や硬質芯材部１０３の存在により耐圧性も付与され、耐久性に優れた可撓性耐圧・耐油ホース１０１とされている。
　しかしながら、ゴム材は合成樹脂材に比べて重く、当該ゴム材からなる周壁部１２１、１２２を２層積層した図６のホースは重量が大きく、運搬や施工時の作業性向上の観点から軽量化が求められていた。また、外側の周壁部には耐候性を有するゴム材が必要であり、コストアップの原因にもなっていた。
特開２００５－１５５７６１号公報 特開２００８－２６１４８５号公報 特開昭５５－４４１８７号公報
　そこで、本発明が前述の状況に鑑み、解決しようとするところは、耐久性・耐圧性に優れるとともに軽量化・低コスト化を図ることができる可撓性耐圧・耐油ホースを提供する点にある。
　本発明は、前述の課題解決のために、内面がほぼフラットの軟質本体部と、この軟質本体部の補強を行うために該軟質本体部の外面上または内部に設けられる螺旋状の硬質芯材部とを備えてなる可撓性耐圧ホースにおいて、前記軟質本体部が耐油性の熱可塑性エラストマーよりなることを特徴とする可撓性耐圧・耐油ホースを構成した。
　ここで、前記軟質本体部内に多数の補強糸からなる網状部を設けるとともに、前記硬質芯材部を軟質本体部の外面上に螺旋状に付設したものが好ましい。
　また、具体的には、前記硬質芯材部が金属線よりなり、前記軟質本体部の外面に前記硬質芯材部を付設するとともに、その外面側に、熱可塑性エラストマーよりなる外側被覆層を設けたものが好ましい。
　あるいは、前記硬質芯材部を軟質本体部の内部に設けるとともに、その内側面を塞ぐように同じく耐油性の熱可塑性エラストマーよりなる内側被覆層を設けたものも好ましい。
　以上にしてなる本願発明に係る可撓性耐圧・耐油ホースによれば、軟質本体部が耐油性の熱可塑性エラストマーよりなるので、従来のゴム製のものに比べて軽量化を図れ（比重が小さく、５～３０％程度軽量化される。）、運搬や施工時の作業性（ハンドリング）を向上できる。また、優れた耐候性を有し、高価な耐候性ゴムを用いる必要がなく、またゴム層と樹脂層の２層構造とする必要もなく、よって低コスト化を図ることができる。とくに硬質芯材部を金属線より構成すれば、静電気防止効果も得られる。また、従来のゴム製ではできなかった透明な本体部とすることも可能となる。
本発明の第１実施形態に係る可撓性耐圧・耐油ホースを示す一部破断側面図。 本発明の第２実施形態に係る可撓性耐圧・耐油ホースを示す一部破断側面図。 （ａ），（ｂ）は、本発明の第３実施形態に係る可撓性耐圧・耐油ホースを示す一部破断側面図。 従来の可撓性耐圧ホースを示す一部破断側面図。 従来の他の可撓性耐圧ホースを示す一部破断側面図。 従来の可撓性耐圧・耐油ホースを示す一部破断側面図。
　１　可撓性耐圧・耐油ホース
　２　軟質本体部
　３　硬質芯材部
　４　網状部
　６　外側被覆層
　７　内側被覆層
　２０　内側層
　２１　外側層
　３０　金属線
　３１　熱可塑性エラストマー層
　５１　補強糸
　５２　金属線
　１０１　可撓性耐圧・耐油ホース／可撓性耐圧ホース
　１０２　軟質本体部
　１０３　硬質芯材部
　１０４　網状部
　１２１　内側周壁部
　１２２　外側周壁部
　次に、本発明の実施形態を添付図面に基づき詳細に説明する。
　図１は、本発明に係る可撓性耐圧・耐油ホースの第１実施形態を示す一部破断側面図であり、図２は第２実施形態、図３は第３実施形態を示し、図中符号１は可撓性耐圧・耐油ホース、２は軟質本体部、３は硬質芯材部をそれぞれ示している。
　本発明の可撓性耐圧・耐油ホース１は、図１に示すように、内面がほぼフラットの軟質本体部２と、この軟質本体部２の補強を行うために該軟質本体部２の外面上または内部に設けられる螺旋状の硬質芯材部３とを備え、軟質本体部２が耐油性の熱可塑性エラストマーよりなることを特徴としている。
　耐油性の熱可塑性エラストマーとしては、オレフィン系エラストマーやアクリルオレフィン系エラストマー、ポリアミド系エラストマー、ポリエステル系エラストマー、ポリウレタン系エラストマー、塩化ビニル系エラストマーなどの耐油性に優れる熱可塑性エラストマーを用いることができ、更に熱可塑性樹脂、たとえばポリプロピレン系樹脂やポリエチレン系樹脂などを混合したものを用いることもできる。
　第１実施形態に係る可撓性耐圧・耐油ホース１は、図１に示すように、耐油性熱可塑性エラストマーよりなる軟質本体部２の外面上に硬質芯材部３が螺旋状に付設されたものであり、軟質本体部２の内部には、内部圧力によるホース破壊の限界値を上げるために、アラミド繊維やビニロン繊維、ナイロン繊維、ポリエステル繊維などの多数の補強糸からなる網状部４が設けられている。本実施形態の硬質芯材部３は、ポリオレフィン系樹脂などの硬質合成樹脂よりなり、補強用の粉状或いは繊維状の充填材を添加したものがより好ましい。ポリオレフィン系樹脂としては、たとえばポリプロピレン系樹脂やポリエチレン系樹脂などを用いることができる。
　このような網状部４を有する軟質本体部２は、耐油性熱可塑性エラストマーよりなる内側層２０の上に網状部４としてクロス糸を配置させ、その外側に、同じく耐油性熱可塑性エラストマーよりなる外側層２１を積層して構成され、この外側層２１により更に外周側に巻回される上記硬質芯材部３が保持されている。網状部４は従来から公知の耐圧ホースに使用されるものを広く適用できる。また、本例では、硬質芯材部３底面の中央部に沿って、螺旋状に補強糸５１および金属線５２を２本並列に設けており、ホースの外側への膨張を抑制できるとともに、とくに金属線５２の存在によりアース線として静電気防止効果を有することとなる。金属線５２としては鋼線や銅線等を用いることができ、補強糸５の繊維については上記網状部４のものと同様の繊維を採用すればよい。なお、本例では補強糸５１と金属線５２の双方を設けたが、いずれか一方のみ設けたものでも勿論よい。
　次に、図２に基づき、本発明の第２実施形態を説明する。
　本実施形態に係る可撓性耐圧・耐油ホース１は、硬質芯材部３が金属線よりなり、当該金属線よりなる硬質芯材部３を外面に配置した軟質本体部２の外側に、さらに熱可塑性エラストマーよりなる外側被覆層６を設けたものである。
　金属線は、鋼線や銅線等を用いることができ、このような金属線を設けることにより静電気防止効果を有することとなる。硬質芯材部３は金属線のみからなる裸線としてもよいが、本例では金属線３０の外面に熱可塑性エラストマー層３１を被覆した被覆線とされている。このような被覆線とすることにより、熱可塑性エラストマー層３１が同じく熱可塑性エラストマーからなる軟質本体部２および外側被覆層６とそれぞれ相溶性を有し、接着性が向上することとなる。
　外側被覆層６に用いる熱可塑性エラストマーとしては、耐摩耗性の熱可塑性エラストマーを用いることが好ましく、例えば、水添加ポリスチレン系熱可塑性エラストマー及びポリオレフィン系樹脂を含む混合物や、ポリウレタン系熱可塑性エラストマー、ポリアミド系エラストマー、ポリエステル系エラストマー等を用いることができる。水添型ポリスチレン系熱可塑性エラストマーとしては、スチレン－エチレンブチレン－スチレンブロック共重合体などを用いることができ、また、混合するポリオレフィン系樹脂としてはポリプロピレン系樹脂やポリエチレン系樹脂を用いることができる。また、外側被覆層６を熱可塑性エラストマーよりなるものとする代わりに、合成樹脂よりなるもの、例えばポリオレフィン系樹脂を用いることもできるし、ポリ塩化ビニール樹脂を用いることもできる。
　次に、図３に基づき、本発明の第３実施形態を説明する。
　本実施形態に係る可撓性耐圧・耐油ホース１は、図３（ａ）に示すように、ポリオレフィン系樹脂などの硬質合成樹脂よりなる硬質芯材部３を、耐油性の熱可塑性エラストマーよりなる軟質本体部２の内部に設けたものである。より詳しくは、螺旋状に延びる略同一の厚みの軟質本体部２と硬質芯材部３とが長手方向に沿って交互に接合された内外面略フラットのホースである。このような構造のホースは、軟質本体部２と硬質芯材部３のテープを同時に連続溶融押出して成形したものを回転軸上に螺旋状に巻きつけ、順次溶着させることで得ることができ、たとえば硬質芯材部３のテープ部の前後に軟質本体部２のテープ部の略半分の部分が一体成形されたものを螺旋状に巻きつけ、軟質本体部３のテープ部の略半分の部分同士を順次溶着して構成できる。
　図３（ｂ）は、さらに内側面を塞ぐように同じく耐油性の熱可塑性エラストマーよりなる内側被覆層７を設けた変形例を示している。本例によれば、重量の増大を抑制しながらも、耐油性ならびに耐圧性の更なる向上を図ることができる。とくに、上記図３（ａ）の構造では、硬質芯材部３の部分が内面に露出し、耐油性の点で危惧があるが、本例のように耐油性の内側被覆層７を設けることで解消できる。その他、耐摩耗性に優れる外側被覆層を設けることも好ましい。
　次に、図１で説明した本発明に係る可撓性耐圧・耐油ホース（実施例１）、図６で説明した従来の可撓性耐圧・耐油ホース（比較例１）、図４で説明した従来の可撓性耐圧ホース（比較例２）について、耐油浸漬試験を行った結果について説明する。
　実施例１および比較例１、２の各ホースの最内層（軟質本体部／内側周壁部）の試験体を作製し、ガソリン、灯油、切削油について、それぞれＪＩＳ Ｋ ６２５８「加硫ゴム物理試験方法」の浸漬試験の項に準拠し、温度２２℃、１６８時間の条件で浸漬試験を行ない、この試験前後の質量変化率を測定した。各試験体の質量変化率を下記の表１に示す。
Figure JPOXMLDOC01-appb-T000001
　上記表１の結果に示すように、本発明の実施例１では、比較例１の従来の可撓性耐圧・耐油ホースの内側周壁部（耐油性ゴム材料）と同等の耐油性を備えており、油性流体の搬送も可能であることが分かる。とくにガソリンについては、より高い耐油性を示している。一方、比較例２の従来の可撓性耐圧ホースは耐油性に欠けており、油性流体の搬送はできないことが分かる。
　以上、本発明の実施形態について説明したが、本発明はこうした実施例に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲において種々なる形態で実施し得ることは勿論である。

Claims (4)

  1. 　内面がほぼフラットの軟質本体部と、この軟質本体部の補強を行うために該軟質本体部の外面上または内部に設けられる螺旋状の硬質芯材部とを備えてなる可撓性耐圧ホースにおいて、前記軟質本体部が耐油性の熱可塑性エラストマーよりなることを特徴とする可撓性耐圧・耐油ホース。
  2. 　前記軟質本体部内に多数の補強糸からなる網状部を設けるとともに、前記硬質芯材部を軟質本体部の外面上に螺旋状に付設してなる請求項１記載の可撓性耐圧・耐油ホース。
  3. 　前記硬質芯材部が金属線よりなり、前記軟質本体部の外面に前記硬質芯材部を付設するとともに、その外面側に、熱可塑性エラストマーよりなる外側被覆層を設けてなる請求項１又は２記載の可撓性耐圧・耐油ホース。
  4. 　前記硬質芯材部を軟質本体部の内部に設けるとともに、その内側面を塞ぐように同じく耐油性の熱可塑性エラストマーよりなる内側被覆層を設けてなる請求項１記載の可撓性耐圧・耐油ホース。
PCT/JP2009/070906 2008-12-17 2009-12-15 可撓性耐圧・耐油ホース WO2010071130A1 (ja)

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EP09833433A EP2378175A1 (en) 2008-12-17 2009-12-15 Flexible, pressure-resistant and oil-resistant hose
US13/140,570 US20110247714A1 (en) 2008-12-17 2009-12-15 Flexible, pressure-resistant and oil-resistant hose
CN2009801513401A CN102257305A (zh) 2008-12-17 2009-12-15 挠性耐压耐油软管
JP2010542974A JPWO2010071130A1 (ja) 2008-12-17 2009-12-15 可撓性耐圧・耐油ホース

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US20110247714A1 (en) 2011-10-13
CN102257305A (zh) 2011-11-23
JPWO2010071130A1 (ja) 2012-05-31

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