JP2007125694A - Fuel hose and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel hose which realizes the excellent impermeability of a barrier layer even in a case that a resin such as FEP or the like originally having no crosslinkable region is used in the barrier layer and is easily subjected to bending molding. <P>SOLUTION: The fuel hose comprises a tubular body 1 based on a rubber having fuel resistance and the barrier layer 2 formed by spirally winding a surface treated planar material 2a around the outer peripheral surface of the tubular body 1 so as to be partially overlapped with each other. The overlapped part 2b of the planar material 2a is bonded through a rubber composition or a coupling agent. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fuel hose used for a fuel pipe of an automobile or the like and a manufacturing method thereof. More specifically, the present invention relates to a fuel hose used for fuel piping of an automobile or the like provided with a fuel-resistant tubular body and a shielding layer containing a fluororesin, and a method for manufacturing the same.

  Fuel hoses used for fuel piping of automobiles and the like are required to have fuel resistance that does not deteriorate due to fuel such as gasoline and light oil from the viewpoint of maintaining product performance. Furthermore, in recent years, from the viewpoint of environmental protection, in addition to the above-described fuel resistance, permeation resistance that prevents fuel from penetrating the hose and being discharged to the outside is required.

  In order to meet such demands, a fuel hose generally has a multilayer structure in which a tubular body made of rubber having high fuel resistance is used as an innermost layer, and a shielding layer made of resin having high permeation resistance is provided on the outer side thereof. In addition, when weather resistance against changes in the external environment such as changes in temperature and humidity, and impact resistance against vibration are required, a protective layer made of rubber with excellent weather resistance and impact resistance is provided as the outermost layer. ing.

  Examples of conventional fuel hoses include an inner layer (tubular body) made of rubber such as nitrile rubber (NBR) and fluoro rubber (FKM), an intermediate layer (shielding layer) made of fluororesin (THV), and epichlorohydrin rubber (ECO). The thing provided with the outer layer (protective layer) which consists of rubber | gum etc. is known (for example, refer patent document 1). FKM and THV are both tetrafluoroethylene (TFE) -hexafluoropropylene (HFP) -vinylidene fluoride (VDF) copolymers, but the copolymerization ratios of the two are different.

  Such a fuel hose is manufactured by the following method. In the first step, the inner layer rubber is extruded into a tubular shape around the inner core, in the second step, the intermediate layer THV is extruded on the inner layer, and in the third step, the outer layer is formed on the intermediate layer. Extrude the resulting rubber. Next, the laminated hose formed in the first to third steps is heated, and the elasticity of the inner layer and outer layer rubber is vulcanized. At this time, the inner layer and the outer layer crosslink with the VDF of THV at the interface with the intermediate layer. Thereby, the inner layer and the intermediate layer and the outer layer and the intermediate layer are bonded.

  When the fuel hose has a curved shape, the vulcanization process is divided into preliminary vulcanization and main vulcanization. That is, after giving a certain degree of elasticity and interlayer adhesion to the laminated hose by preliminary vulcanization, a core member having a desired bending shape is inserted into the laminated hose, and in this state, the vulcanization is performed to fix the shape and Vulcanization is completed.

  Moreover, what uses tetrafluoroethylene (TFE) -hexafluoropropylene (HFP) copolymer (FEP) as a shielding layer of a fuel hose is also examined (for example, refer patent document 2).

Although FEP has better permeation resistance than THV, it does not have crosslinkable molecular structural units like VDF in THV to adhere to adjacent layers. For this reason, when FEP is used as a shielding layer for a fuel hose, a surface of the sheet-like FEP is subjected to surface treatment by corona discharge or the like to form a crosslinkable portion in advance, and the surface-treated FEP sheet is used as a rubber. The shielding layer is formed by winding the tube so that a part thereof overlaps the outer peripheral surface of the tube. And the rubber | gum used as a protective layer is extrusion-molded on a shielding layer, and the shielding layer, the rubber tube, and the protective layer are adhere | attached by heat-processing.

  Further, there is also known a fuel hose provided with an inner layer made of rubber having fuel resistance, a shielding layer formed of a surface-treated fluororesin sheet in a cylindrical shape, and an outer layer having weather resistance (for example, patents) See reference 3.)

  In such a fuel hose, both end edges of the fluororesin sheet are combined into a cylindrical shape, and the shielding layer is formed by adhering the combined portion by fusion or the like. The adhesion part of this cylindrical fluororesin sheet is formed linearly along the longitudinal direction of the fuel hose.

JP 2000-289121 A US Pat. No. 5,427,831 JP 7-314610 A

  However, in the conventional fuel hose described in Patent Document 1, the rigidity of THV itself used as the intermediate layer (shielding layer) is high, and the thickness of the intermediate layer is required to ensure permeation resistance beyond a certain level. Therefore, it is difficult to follow the shape of the core member when inserting the core member in the curved shape processing, and it is difficult to insert the core member.

  Further, in the fuel hose described in Patent Document 2, since the FEP has excellent permeation resistance, the thickness of the shielding layer can be made extremely thin, thereby improving the flexibility of the fuel hose. Can be made. However, even if the surface-treated FEP sheet is wound so that a part thereof overlaps to form a shielding layer and bonded to the rubber tube and the protective layer, the FEP sheets are not bonded to each other. There is a risk that the fuel may permeate from the combined portion. Also, in the case of producing a curved fuel hose, it becomes easy to create a gap in the overlapped part, for example, the FEP sheet wound when the laminate is inserted into the core member having a bent shape after preliminary vulcanization, There is also a problem that the function as a shielding layer cannot be sufficiently achieved. Furthermore, it has been proposed to provide a reinforcing layer on the outside of the FEP sheet and press the wound FEP sheet from above, but it is difficult to completely eliminate the gap between the FEP sheets.

  On the other hand, in the fuel hose described in Patent Document 3, since the bonded portion of the fluororesin sheet is formed in a straight line along the longitudinal direction of the fuel hose, directionality occurs in the bending characteristics of the fuel hose. For this reason, when producing a curved fuel hose, it may be difficult to bend the hose appropriately in a desired direction after preliminary vulcanization. In particular, when both ends of the fluororesin sheet are bonded together by fusion, the crosslinkable portion of the fluororesin sheet surface disappears due to heat during fusion. For this reason, in the vicinity of the adhesive portion of the fluororesin sheet, the adhesive strength between the adjacent inner layer and outer layer is reduced, which causes a gap between the layers, which may reduce the permeation resistance of the fuel hose.

  The present invention has been made in view of the above problems, and when using a resin such as FEP that does not originally have a crosslinkable site as a shielding layer, while realizing excellent permeation resistance of the shielding layer, It is an object of the present invention to provide a fuel hose that can be bent easily and a method for manufacturing such a fuel hose.

The characteristic structure of the fuel hose according to the present invention includes a tubular body mainly composed of a fuel-resistant rubber, a tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polytetrafluoroethylene (PTFE), and tetrafluoro. A surface-treated planar body mainly composed of one selected from the group consisting of an ethylene-perfluoroalkyl vinyl ether copolymer (PFA) and a tetrafluoroethylene-ethylene copolymer (ETFE) And a shielding layer that is spirally wound so as to partially overlap the outer peripheral surface, and the overlapping portion of the planar body is bonded via a rubber composition or a coupling agent.

In the fuel hose of this configuration, the overlapping portion of the planar bodies is bonded via a rubber composition or a coupling agent. For this reason, it can prevent that a fuel permeate | transmits from the said overlap part. Furthermore, in the case of producing a curved fuel hose, the overlapping portions of the planar bodies are bonded even when the core member is inserted, so that the overlapping of the planar bodies is not shifted and no gap is generated. For this reason, it becomes possible to realize a fuel hose excellent in permeation resistance.
In addition, the overlapping portion, which is the bonding portion of the planar body, is formed in a spiral around the longitudinal axis of the fuel hose. For this reason, the fuel hose has a uniform bending characteristic in all directions, and bending forming when producing a curved fuel hose becomes easy.
Further, by making the planar body spirally wound, the structural non-uniformity of the fuel hose is minimized, and the fluid pressure generated during fuel flow is applied substantially evenly to the inner wall of the fuel hose. For this reason, local fatigue of the fuel hose can be prevented and the product life can be extended.

  Another characteristic configuration of the fuel hose according to the present invention is a tubular body mainly composed of rubber having fuel resistance, a tetrafluoroethylene-hexafluoropropylene copolymer (FEP), a polytetrafluoroethylene (PTFE), A surface-treated first planar body comprising as a main component one selected from the group consisting of tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) and tetrafluoroethylene-ethylene copolymer (ETFE). , Selected from the group so as to cover the first shielding layer spirally wound around the outer peripheral surface of the tubular body and the two first planar bodies adjacent to each other in the first shielding layer. A second shielding layer formed by spirally winding a second planar body having one surface as a main component and surface-treated, and the first shielding layer and the first shielding layer. A shielding layer lies in that is bonded via a rubber composition.

In the fuel hose of this configuration, the first planar body is spirally wound around the tubular body to form the first shielding layer, and the second planar body is spirally wound outside the first shielding layer. A second shielding layer is formed. Here, the second planar body is wound so as to cover two adjacent first planar bodies in the first shielding layer. Furthermore, the 1st shielding layer and the 2nd shielding layer are adhere | attached through the rubber composition. For this reason, it can prevent that a fuel permeate | transmits between the edge parts (gap part) of the width direction of two adjacent 1st planar bodies in a 1st shielding layer. Further, although it is conceivable that the fuel permeates through the rubber composition, even in this case, after passing through the gap, the fuel moves along the second shielding layer in the longitudinal direction of the fuel hose, and the second The end of the planar body in the width direction must be reached, and thus the fuel outflow path can be complicated and lengthened. For this reason, it becomes possible to realize a fuel hose excellent in permeation resistance.
Further, the first planar body and the second planar body are formed in a spiral around the longitudinal axis of the fuel hose. For this reason, the fuel hose has a uniform bending characteristic in all directions, and bending forming when producing a curved fuel hose becomes easy.
Further, by making the first planar body and the second planar body spirally wound, the non-uniformity in the structure of the fuel hose is minimized, and the fluid pressure generated during the fuel flow is substantially evenly applied to the inner wall of the fuel hose. It will be. For this reason, local fatigue of the fuel hose can be prevented and the product life can be extended.

  In the fuel hose of the present invention, the tubular body includes fluororubber (FKM), epichlorohydrin rubber (ECO), nitrile rubber (NBR), a blend polymer of nitrile rubber (NBR) and polyvinyl chloride (PVC), and those One selected from the group consisting of derivatives is preferably the main component.

In the fuel hose with this configuration, FKM, ECO, NBR, and blend polymers of NBR and PVC all have good fuel resistance, and also have excellent fuel permeation resistance. Can be further improved.
Further, since the tubular body itself has excellent fuel permeation resistance, it is possible to prevent fuel from passing through the tubular body in the longitudinal direction of the hose and leaking from the end of the hose at the joint portion of the fuel hose.
The blend polymer of NBR and PVC generally has a blend ratio of NBR: PVC = 85 to 65:15 to 35 and has rubber performance, and is a kind of rubber having fuel resistance in the present invention. is there.

  In the fuel hose of the present invention, the tubular body includes a first rubber layer mainly composed of fluoro rubber (FKM) and an outer side of the first rubber layer, and epichlorohydrin rubber (ECO), nitrile rubber (NBR). ), And a second rubber layer mainly composed of one selected from the group consisting of a blend polymer of nitrile rubber (NBR) and polyvinyl chloride (PVC).

  In the fuel hose of this configuration, the cost of the fuel hose can be reduced because the usage rate of the expensive FKM can be reduced while sufficiently securing the thickness of the tubular body.

  In the fuel hose of the present invention, the fluorine rubber (FKM) has a fluorine content of 68 wt. % Or more is preferable.

  In the fuel hose having this configuration, the fluorine content of FKM is 68 wt. If it is at least%, the permeation resistance of the fuel becomes particularly good, so that the permeation resistance of the fuel as a hose can be improved. Moreover, in the joint part of a fuel hose, since it can suppress that a fuel permeate | transmits a tubular body along the longitudinal direction of a hose, it can prevent that a fuel leaks from the end of a fuel hose.

  In the fuel hose of the present invention, it is possible to provide a protective layer mainly composed of rubber as the outermost layer.

  In the fuel hose of this configuration, the protective layer mainly composed of rubber is provided as the outermost layer, so that the weather resistance and impact resistance can be improved.

  In the fuel hose of the present invention, the rubber composition includes fluorine rubber (FKM), nitrile rubber (NBR), epichlorohydrin rubber (ECO), acrylic rubber (ACM), ethylene acrylic rubber (AEM), and nitrile rubber (NBR). It is preferable that a main component is one selected from the group consisting of a blend polymer of polyvinyl chloride (PVC) and derivatives thereof.

  In the fuel hose of this configuration, since a suitable material is selected as the rubber composition, the crosslinking reaction is easily caused by the vulcanizing agent contained in the rubber composition. As a result, the shielding layer, the tubular body, and the protective layer And adhesion of overlapping portions of the planar members constituting the shielding layer are easy. In addition, since the rubber composition is excellent in fuel resistance, the adhesive strength of the overlapping portion of the planar bodies is not weakened.

  In the fuel hose of the present invention, it is preferable that the coupling agent is mainly composed of one selected from the group consisting of a silane coupling agent and a titanate coupling agent.

  In the fuel hose of this configuration, since a suitable material is selected as the coupling agent, the crosslinking reaction easily occurs, and as a result, the adhesion between the shielding layer and the tubular body and the protective layer, and the surface constituting the shielding layer. It is easy to bond the overlapping parts.

  In the fuel hose of the present invention, the planar body has a thickness of 0.025 to 0.2 mm, and the width of the overlapping portion of the planar bodies is made to be half or less of the width of the planar body. preferable.

  In the fuel hose of this configuration, the thickness of the planar body and the width of the overlapping portion of the planar body are set so as to achieve an optimal balance between flexibility and permeation resistance. A fuel hose excellent in permeation resistance that sufficiently prevents fuel permeation can be realized. That is, with such a fuel hose, even if the thickness of the shielding layer is made thinner than that of the conventional hose using THV, the permeation resistance equal to or higher than that of the conventional hose can be secured, and the thickness of the shielding layer is reduced. By doing so, the flexibility is improved, so that it becomes easy to insert into the core member when the curved fuel hose is manufactured. In this configuration, the planar body having a thickness of 0.025 to 0.2 mm is wound so that the width of the overlapping portion is not more than half of the width of the planar body. The thickness is 0.025 to 0.4 mm.

  Moreover, the characteristic means of the manufacturing method of the fuel hose which concerns on this invention is tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer ( PFA), and a step of applying a rubber composition or a coupling agent to both surfaces of the surface-treated planar body, the main component being one selected from the group consisting of tetrafluoroethylene-ethylene copolymer (ETFE) And a step of forming a shielding layer by spirally winding the planar body on the outer peripheral surface of a tubular body formed by extruding rubber having fuel resistance into a tubular shape, and A process of forming a protective layer by extruding rubber on the outside, a rubber constituting the tubular body by heat treatment, and a rubber constituting the protective layer With vulcanized adhesion between the shielding layer and the tubular body and the protective layer, as well as the point comprises a step of performing bonding of the overlapping portion of the planar body.

In the fuel hose manufacturing method of this means, the planar bodies constituting the shielding layer can be bonded to each other by the rubber composition or the coupling agent, so that the fuel resistance of the fuel hose can be improved.
Further, since the rubber constituting the tubular body and the rubber constituting the protective layer can be vulcanized, the adhesion between the shielding layer and the tubular body and the protective layer, and the overlapping of the planar bodies can be simultaneously performed by heat treatment. A fuel hose with high production efficiency and good permeation resistance can be easily produced.

Another characteristic means of the method for producing a fuel hose according to the present invention includes tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer ( PFA) and tetrafluoroethylene-ethylene copolymer (ETFE) as a main component, the surface-treated first planar body is extruded into a fuel-resistant rubber into a tubular shape A step of forming a first shielding layer by spirally winding the outer peripheral surface of the tubular body, a step of forming an adhesive layer by extruding a rubber composition outside the first shielding layer, and the first shielding. The second planar body subjected to the surface treatment with the main component of one selected from the group so as to cover the two adjacent first planar bodies in the layer, A step of forming a second shielding layer by spirally winding the outer side of the first shielding layer through an adhesion layer; a step of forming a protective layer by extruding rubber outside the second shielding layer; The rubber constituting the tubular body and the rubber constituting the protective layer are vulcanized by heat treatment, and the tubular body, the first shielding layer, the adhesive layer, the second shielding layer, and the protective layer are bonded. And a process.

In the fuel hose manufacturing method of this means, the second shielding layer is provided by spirally winding the second planar body so as to cover two adjacent first planar bodies in the first shielding layer. Furthermore, the 1st shielding layer comprised by the 1st planar body and the 2nd shielding layer comprised by the 2nd planar body are adhere | attached with the contact bonding layer which consists of a rubber composition. Since the fuel hose manufactured in this way has an advanced structure in which the fuel does not easily flow out of the hose, the fuel resistance of the fuel hose can be improved.
Further, the rubber constituting the tubular body and the rubber constituting the protective layer, and the adhesion of the tubular body, the first shielding layer, the adhesive layer, the second shielding layer, and the protective layer can be simultaneously performed by heat treatment. Therefore, a fuel hose having high production efficiency and good permeation resistance can be easily produced.

[First Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a configuration of a fuel hose 100 according to a first embodiment of the present invention. The fuel hose 100 includes a tubular body 1 and a shielding layer 2, and a protective layer 3 is provided on the shielding layer 2. Although the fuel hose 100 shown in FIG. 1 has a triple layer structure, this is only an example of the embodiment of the present invention. For example, the protective layer 3 is omitted or an intermediate layer is added. It is also possible to do.

(Tubular body)
The tubular body 1 is provided as the innermost layer of the fuel hose 100 and is in direct contact with fuel such as gasoline or light oil. For this reason, the tubular body 1 is comprised with the material which has fuel resistance. Examples of the material having fuel resistance include fluoro rubber (FKM), epichlorohydrin rubber (ECO), nitrile rubber (NBR), blend polymer of nitrile rubber (NBR) and polyvinyl chloride (PVC), and derivatives thereof. Can be mentioned. The tubular body 1 preferably contains one or more of the above materials as a main component. The above materials are particularly preferable because they have better fuel permeation resistance than conventional rubber.

  The said material used for the tubular body 1 is used with a vulcanizing agent. For example, for FKM, conventionally known vulcanizing agents such as polyamine vulcanizing agents, polyol vulcanizing agents and peroxide vulcanizing agents can be used. From the viewpoint of increasing the sealing performance against the fuel at the joint portion of the fuel hose, a polyol vulcanizing agent is preferable. For ECO, polyamine vulcanizing agent, amine sulfur compound combined vulcanizing agent, thiuram vulcanizing agent, thiourea vulcanizing agent, peroxide vulcanizing agent, triazine vulcanizing agent, quinoxaline Conventionally known vulcanizing agents such as peroxide vulcanizing agents and sulfur can be used for NBR such as vulcanizing agents.

The tubular body 1 may be a single layer, but can also be composed of two or more layers combining different types of rubber. For example, a double tubular body in which the first rubber layer is FKM and ECO is provided as the second rubber layer adjacent to the outside can be formed. In this case, since the fuel hose 100 uses FKM as the first rubber layer, the fuel hose 100 has excellent fuel resistance, and since ECO is used as the second rubber layer adjacent to the outside of the first rubber layer, the fuel hose 100 has low cold resistance. (That is, the rubber elasticity of the fuel hose 100 does not decrease even during continuous use in winter). Further, as the second rubber layer, NBR or a blend polymer of NBR and PVC may be used instead of ECO. That is, by making the tubular body into a two-layer structure, the usage rate of expensive FKM is kept within a range where the oil resistance and permeation resistance required for the tubular body of the fuel hose can be secured, and the tubular body itself is made of an inexpensive rubber material. Ensure thickness. Thereby, while suppressing the cost of the fuel hose, it is possible to obtain a fuel hose in which the elastic deformation of the tubular body is increased and the joint can be easily inserted into the inside. Of course, the tubular body is not limited to two layers, and the same effect can be obtained even if three or more layers are formed.

  When FKM is used for the tubular body, the FKM contains 68 wt. % Or more is preferable. FKM has a fluorine content of 68 wt. If it is at least%, the permeation resistance of the fuel becomes particularly good, so that the permeation resistance of the fuel as a hose can be improved. Moreover, in the joint part of a fuel hose, since it can suppress that a fuel permeate | transmits a tubular body along the longitudinal direction of a hose, it can prevent that a fuel leaks from the end of a fuel hose. The fluorine content of FKM is 69 wt. % Or more, more preferably 70 wt. % Or more is more preferable.

(Shielding layer)
The shielding layer 2 is composed of tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), and tetrafluoroethylene-ethylene copolymer. A planar body 2a having one selected from the group consisting of coalescence (ETFE) as a main component and surface-treated by gas discharge is spirally wound so that a part of the outer circumferential surface of the tubular body 1 overlaps. The overlapping portion 2b of the planar body 2a is bonded via a rubber composition or a coupling agent. In addition, in order to simplify description, in the following description of the embodiment, an FEP sheet will be described as an example of the planar body 2a constituting the shielding layer 2.

  What is important when manufacturing the shielding layer 2 is that when the planar body 2a is spirally wound so as to partially overlap the outer peripheral surface of the tubular body 1, the overlapping portion 2b of the planar body 2a is formed. It is to adhere. In this respect, in the present invention, since the overlapping portion 2b is bonded via a rubber composition or a coupling agent, fuel can be prevented from permeating from the overlapping portion 2b, and a fuel hose having excellent permeation resistance. 100 can be realized. In addition, when the fuel hose 100 having a curved shape is manufactured, when the core member is inserted into the pre-vulcanized fuel hose 100, a sufficient adhesive force is applied to the overlapping portion 2b of the planar body 2a. For this reason, there is no possibility of being fixed with a gap.

  By the way, although FEP is less flexible than THV conventionally used for the shielding layer, it has excellent permeation resistance. Therefore, the fuel hose 100 using FEP for the shielding layer 2 can make the thickness of the shielding layer 2 considerably thinner than the fuel hose using THV. Specifically, in the present invention, when the shielding layer 2 is formed, the planar body 2a having a thickness of 0.025 to 0.2 mm is used, and the width of the overlapping portion 2b is half of the width of the planar body 2a. The shielding layer 2 has a thickness of 0.025 to 0.4 mm. Of course, in the present invention, the thickness of the shielding layer 2 is not particularly limited and can be arbitrarily set, but within this thickness range, good flexibility can be obtained while ensuring permeation resistance. Is particularly preferable. That is, if the thickness of the shielding layer 2 becomes too thin, sufficient permeation resistance may not be obtained, and the planar body 2a may be stretched by the winding tension, which is not preferable. On the other hand, if the thickness of the shielding layer 2 becomes too thick, it becomes difficult to wind the planar body 2a, and further, the step of the overlapping portion of the planar body 2a becomes large, so that the adhesion to the tubular body 1 is poor. This is not preferable because it may be sufficient. From such a viewpoint, a more preferable thickness range of the shielding layer 2 is 0.05 to 0.25 mm (corresponding to 0.05 to 0.125 mm as the planar body 2a).

Thus, in the fuel hose 100 of the present invention, the thickness of the shielding layer 2 can be made considerably thinner than a conventional shielding layer (for example, 0.3 to 0.5 mm) using THV. For this reason, in this invention, the fuel hose 100 excellent in permeation resistance which fully prevents permeation | transmission of a fuel can be implement | achieved, ensuring sufficient flexibility. In addition, since the flexibility is good, it becomes easy to insert the core member before the vulcanization process in the manufacturing process, and the manufacturing efficiency is improved.

  As the planar body 2a, one that has been surface-treated in advance by plasma treatment by gas discharge such as glow discharge or corona discharge, graft polymerization, chemical treatment by metallic sodium, or the like is used. When such surface treatment is performed on the planar body 2a, a part of the molecular chain in the copolymer exposed to the planar body 2a is cleaved and activated, and the activated site is FKM, Since it becomes crosslinkable with a molecular structure such as ECO, the adhesion between a resin such as FEP and rubber can be improved.

  A rubber composition or a coupling agent as an adhesive is applied to the overlapping portion 2b of the surface-treated planar body 2a. Then, by winding the planar body 2a on the tubular body 1, the cross section of the overlapping portion 2b of the planar body 2a becomes a FEP / adhesive / FEP sandwich structure. By performing heat treatment (vulcanization treatment) in this state, the surface-treated FEP and the rubber composition or coupling agent can be cross-linked to bring the overlapping portion 2b of the FEPs into close contact.

  The planar body 2a is wound so that the width of the overlapping portion 2b is equal to or less than half of the width of the planar body 2a. At this time, a preferable width of the planar body 2a is 5 to 50 mm, and a preferable width of the overlapping portion 2b is 2 to 10 mm. Within the above range, the fuel hose 100 having a particularly excellent balance between permeation resistance and flexibility and high practicality can be realized.

  The rubber composition or coupling agent used as the adhesive is preferably applied to the entire surface of the planar body 2a. In this way, since the formation of the shielding layer 2 and the adhesion of the shielding layer 2 to the tubular body 1 and the protective layer 3 described later can be performed at a time, the manufacturing process of the fuel hose can be made efficient. .

Examples of the rubber composition include FKM, NBR, ECO, acrylic rubber (ACM), ethylene acrylic rubber (AEM), blend polymers of NBR and PVC, and derivatives thereof. Although it does not restrict | limit at all as a rubber composition, Since it is excellent also in fuel resistance and permeation resistance in addition to adhesiveness, it is especially preferable if it is the said rubber composition. As the vulcanizing agent used in these rubber compositions, conventionally known vulcanizing agents such as polyamine vulcanizing agents, polyol vulcanizing agents and peroxide vulcanizing agents are used for FKM. Although possible, polyamine vulcanizing agents are particularly preferred because they are difficult to gel. Also for other rubber compositions, polyamine vulcanizing agents, amine sulfur compound combined vulcanizing agents, thiuram vulcanizing agents, thiourea vulcanizing agents, peroxide vulcanizing agents, triazine vulcanizing agents. Conventionally known vulcanizing agents such as sulfur, quinoxaline vulcanizing agents, sulfur and the like can be arbitrarily selected.
On the other hand, examples of the coupling agent include a silane coupling agent and a titanate coupling agent. By using such a coupling agent, the same effect as that of the rubber composition can be obtained.

  Further, from the viewpoint of preventing peeling of the overlapping portion 2b of the planar body 2a when the fuel hose 100 is bent, the adhesion strength between the planar bodies 2a is preferably 5 N / cm or more. If the rubber composition or coupling agent exemplified in this embodiment is used, the above adhesion strength can be sufficiently achieved. For example, the adhesion strength is 25 N / cm for FKM, 15 N / cm for ECO, and silane coupling. In the case of the agent, it is 9 N / cm.

In addition, FEP, PTFE, PFA, and ETFE used as the shielding layer 2 can be of any polymerization degree, and the copolymerization rate of FEP, PFA, and ETFE is not limited. In particular, when FEP is used, a tetrafluoroethylene (TFE) -hexafluoropropylene (HFP) copolymer containing 10 to 20% by weight of a tetrafluoroethylene (TFE) structure is preferable. A copolymer having such a composition makes it particularly easy to achieve both permeation resistance and flexibility.

(Protective layer)
The protective layer 3 is for covering the outside of the shielding layer 2. The protective layer 3 is not limited to being covered adjacent to the shielding layer 2, and for example, the shielding layer 2 may be covered via another layer such as a reinforcing layer. Further, the protective layer 3 is not limited to a single layer structure, and may have a multilayer structure of two or more layers.
Normally, the fuel hose 100 is piped in an engine room, a floor portion of a vehicle body, and the like and used outdoors, so it is often exposed to vibration and temperature / humidity changes during vehicle travel. Therefore, it is preferable that the material used for the protective layer 3 has impact resistance, weather resistance, heat resistance, ozone resistance and the like so that it can withstand such changes in the external environment. Examples of such materials include FKM, blends of NBR and PVC, ECO, ACM, AEM, silicone rubber (Q), urethane rubber (U), chloroprene rubber (CR), ethylene propylene rubber (EPDM), chlorosulfone Examples thereof include materials composed mainly of rubber such as chlorinated polyethylene (CSM), chlorinated polyethylene (CPE), and derivatives thereof. Since the fuel hose 100 provided with such a protective layer 3 has impact resistance, weather resistance, heat resistance, and ozone resistance, it is suitable as a fuel hose for automobiles used outdoors.

  The protective layer 3 can be bonded to the shielding layer 2 by being vulcanized as described above. The vulcanizing agent used for the vulcanization treatment is not particularly limited, and a conventionally known vulcanizing agent corresponding to the base polymer can be arbitrarily selected. Further, the protective layer 3 can be adhered to the shielding layer 2 through an adhesive layer such as the rubber composition, and in this case, the same vulcanizing agent can be used.

[Second Embodiment]
FIG. 2A is a schematic view showing the configuration of the fuel hose 150 according to the second embodiment of the present invention. FIG. 2B is a cross-sectional view of the fuel hose 150 along the tube axis direction. The fuel hose 150 includes the tubular body 1, the first shielding layer 12, and the second shielding layer 22. Further, the adhesive layer 10 is provided between the first shielding layer 12 and the second shielding layer 22, and the protective layer 3 is provided on the second shielding layer 22. However, the protective layer 3 may be omitted when weather resistance and impact resistance are not required so much. Further, an intermediate layer or the like can be added as necessary. In addition, since the tubular body 1 and the protective layer 3 can use the thing similar to the fuel hose 100 by 1st Embodiment among the members which comprise the fuel hose 150, it abbreviate | omits in the following description.

The first shielding layer 12 is composed of a first planar body 12a. Moreover, the 2nd shielding layer 22 is comprised from the 2nd planar body 22a. Both the first planar body 12a and the second planar body 22a are tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer ( PFA) and one selected from the group consisting of tetrafluoroethylene-ethylene copolymer (ETFE) are the main components. The first planar body 12a and the second planar body 22a may have the same main component or may be different from each other.
Further, the first planar body 12a and the second planar body 22a are subjected to surface treatment by gas discharge in order to improve the adhesion to rubber.
Further, the first planar body 12a and the second planar body 22a are preferably processed into a tape shape having a thickness of about 50 to 125 μm from the viewpoint of easy handling of the fuel hose 150 as a finished product.

The first shielding layer 12 is formed by spirally winding the first planar body 12 a around the outer peripheral surface of the tubular body 1. The second shielding layer 22 is spirally formed on the outside of the first shielding layer 12 so as to cover the second planar body 22a across the two first planar bodies 12a adjacent to each other in the first shielding layer 12. It is formed by winding around. That is, as can be seen from FIG. 2B, when the fuel hose 150 is viewed from the inside to the outside, at least one of the first shielding layer 12 and the second shielding layer 22 is present in the direction perpendicular to the tube axis. It has a simple laminated structure. When winding the first planar body 12a, the two adjacent first planar bodies 12a are wound so that a part thereof overlaps, similarly to the planar body 2a in the fuel hose 100 of the first embodiment. However, the end of the first planar body 12a in the width direction may be abutted, or may be wound with a gap so as to have a gap. Although the space | interval of a clearance gap can be arbitrarily set by relationship with the width | variety of the 2nd planar body 22a, it is preferable to set it as about 0-5 mm. In FIG. 2, as an example, a state is shown in which two adjacent first planar bodies 12 a are wound around the tubular body 1 so as to have a gap.

  Moreover, the 1st shielding layer 12 and the 2nd shielding layer 22 are adhere | attached through the contact bonding layer 10 containing a rubber composition. The adhesive layer 10 is preferably formed on the entire outer peripheral surface after the first shielding layer 12 is formed, but as long as it is formed on at least the first planar body 12a constituting the first shielding layer 12. Good. Furthermore, the thickness of the adhesive layer 10 is preferably about 0.1 to 1.0 mm, and is preferably 0.2 to 0.5 mm in consideration of the strength and cost of the fuel hose 150.

  What is important in producing the fuel hose 150 of the second embodiment is that the tubular body 1, the first shielding layer 12, the adhesive layer 10, the second shielding layer 22, and the protective layer 3 are firmly bonded between the respective layers. It is necessary to make it. In this respect, since the first planar body 12a constituting the first shielding layer 12 and the second planar body 22a constituting the second shielding layer 22 are subjected to surface treatment by gas discharge and are in a crosslinkable state. The tubular body 1 and the first shielding layer 12, and the second shielding layer 22 and the protective layer 3 can be bonded by heat treatment, and both the first shielding layer 12 and the second shielding layer 22 are bonded together. Since the adhesive layer 10 is interposed between them, it can be bonded by heat treatment. Therefore, if the layers are appropriately adjusted and then heat-treated, the fuel hose 150 is provided with a sufficient adhesive force.

Next, the fuel hose 150 is required to have high permeation resistance to the fuel. In this respect, in the fuel hose 150 having the above-described configuration, the fuel is not supplied due to the presence of the second shielding layer. It is possible to prevent the light from passing through between the end portions (gap portions) in the width direction of two adjacent first planar bodies in one shielding layer.
In addition, it is conceivable that the fuel permeates through the rubber composition of the adhesive layer 10 that bonds the first shielding layer and the second shielding layer, but even in this case, the fuel flows out of the fuel hose 150. In the first shielding layer 12, after passing through the end portions in the width direction of two adjacent first planar bodies 12a, the first shielding layer 12 moves in the longitudinal direction of the fuel hose 150 along the second shielding layer 22, Since it is necessary to reach the end in the width direction of the bihedral body 22a, the outflow distance of the fuel becomes long and complicated, and it becomes difficult for the fuel to flow out of the fuel hose 150. For this reason, the fuel hose 150 having excellent permeation resistance can be realized.

  Further, the first planar body 12 a and the second planar body 22 a are formed in a spiral around the longitudinal axis of the fuel hose 150. For this reason, the fuel hose 150 has a uniform bending characteristic in all directions, and bending forming when producing the curved fuel hose 150 becomes easy.

  Further, by making the first planar body 12a and the second planar body 22a spirally wound, the structural non-uniformity of the fuel hose 150 is minimized, and the fluid pressure generated during the fuel flow is the inner wall of the fuel hose 150. It will take approximately evenly. For this reason, local fatigue of the fuel hose 150 is prevented, and the product life can be extended.

[Method of manufacturing fuel hose]
Hereinafter, the fuel hose manufacturing method of the present invention will be described. First, the fuel hose 100 manufacturing method according to the first embodiment will be described, and then the fuel hose 150 manufacturing method according to the second embodiment will be described. .

(Manufacturing method of fuel hose 100)
The fuel hose 100 can be manufactured by the following steps (1) to (4).
(1) A rubber composition or cup containing a vulcanizing agent on both sides of a planar body 2a having a main component selected from the group consisting of FEP, PTFE, PFA, and ETFE, and surface-treated by gas discharge A step of applying a ring agent.
(2) A step of forming the shielding layer 2 by spirally winding the planar body 2a on the outer peripheral surface of the tubular body 1 obtained by extruding fuel-resistant rubber into a tubular shape so as to partially overlap.
(3) A step of forming the protective layer 3 by extruding rubber on the outside of the shielding layer 2.
(4) The rubber constituting the tubular body 1 and the rubber constituting the protective layer 3 are vulcanized by heat treatment at a temperature at which the vulcanizing agent or the coupling agent crosslinks, and the shielding layer 2, the tubular body 1 and the protective layer are vulcanized. 3 and bonding the overlapping portion of the planar body 2a.

  In the step (1), application of the rubber composition or coupling agent as an adhesive is performed by dissolving the adhesive in a solvent such as acetone or methyl ethyl ketone so that the concentration becomes, for example, 20 to 30% by weight. Can be performed by a known method such as a dipping method, a spraying method, or a pasting process. After the coating step, the planar body 2a is dried at room temperature or in a state of being appropriately heated. The sheet-like body 2a coated on the surface with the adhesive thus obtained can be used as it is in the next step, but is wound around a drum or the like and used as necessary. Good.

  In the step (2), the rubber extrusion for producing the tubular body 1 is performed on the outer circumferential surface of the long linear core using the first extruder. Moreover, the winding operation | work which winds the planar body 2a spirally around the outer peripheral surface of the formed tubular body 1 may be performed automatically using a machine, or may be performed manually by an operator.

  In the step (3), the rubber extrusion for producing the protective layer 3 is performed on the outer peripheral surface of the shielding layer 2 formed by winding the planar body 2a using a second extruder. .

  In the step (4), adhesion occurs when the rubber composition is cross-linked with a fluororesin such as FEP by a vulcanizing agent when a rubber composition is used, and FEP or the like when a coupling agent is used. This is caused by cross-linking of the fluororesins. The temperature of the heat treatment (main vulcanization) is a temperature at which a crosslinking reaction of a vulcanizing agent or a coupling agent contained in the rubber composition for bonding the overlapping portion 2b of the planar body 2a occurs. Although specific temperature changes with kinds of a crosslinking agent and a coupling agent, it is about 160 to 180 degreeC (about 60 to 90 minute processing). When heat treatment is performed at such a temperature, the rubber constituting the tubular body 1 and the rubber constituting the protective layer 3 are vulcanized to complete the tubular body 1 and the protective layer 3, and the shielding layer 2 and the tubular body 1 and Adhesion with the protective layer 3 and adhesion of the overlapping portion of the planar body 2a constituting the shielding layer 2 can be performed simultaneously. Therefore, according to the method of the present invention, the manufacturing efficiency of the fuel hose 100 is improved, and the fuel hose 100 having good permeation resistance and flexibility can be easily manufactured.

In the case of manufacturing a fuel hose having a bent shape, preliminary vulcanization is performed before the main vulcanization in the step (4) above, and the shape of the hose is fixed to some extent, and the preliminary vulcanization is finished. A curved core having a desired shape is inserted into the hose, and heat treatment (main vulcanization) is performed in this state. Pre-vulcanization is performed using a steam kettle, for example, by heating for about 20 minutes under a pressure of 4.2 kgf / cm ² (equivalent to a temperature of 140 ° C. to 150 ° C.).

  The step (4) may be pre-vulcanized. In this case, the rubber constituting the tubular body 1 and the rubber constituting the protective layer 3 are fixed to some extent by heat treatment (pre-vulcanization), the adhesion between the shielding layer 2, the tubular body 1 and the protective layer 3, and the surface Adhesion of the overlapping portion of the body 2a is performed. And the fuel hose as a product is completed by performing further heat processing (main vulcanization) to the fuel hose which finished preliminary vulcanization.

(Manufacturing method of fuel hose 150)
The fuel hose 150 can be manufactured by the following steps (11) to (15). (11) The first planar body 12a, whose main component is one selected from the group consisting of FEP, PTFE, PFA, and ETFE, is surface-treated by gas discharge, and rubber having fuel resistance is extruded into an annular shape. A step of forming the first shielding layer 12 by spirally winding the outer circumferential surface of the tubular body 1. (12) A step of forming the adhesive layer 10 by extruding the rubber composition outside the first shielding layer 12.
(13) A second planar body having one selected from the group as a main component and surface-treated by gas discharge so as to cover two adjacent first planar bodies 12a in the first shielding layer 12. A step of forming the second shielding layer 22 by spirally winding 22a around the outside of the first shielding layer 12 via the adhesive layer 10;
(14) A step of forming the protective layer 3 by extruding rubber on the outside of the second shielding layer 22.
(15) The rubber constituting the tubular body 1 and the rubber constituting the protective layer 3 are vulcanized by heat treatment at a temperature at which the vulcanizing agent is crosslinked, and the tubular body 1, the first shielding layer 12, the adhesive layer 10, A step of bonding the second shielding layer 22 and the protective layer 3.

  Among the steps described above, steps (11) to (13) are different from the method for manufacturing the fuel hose 100 described above. In the step (11), unlike the case of the fuel hose 100, the first planar body 12a is directly spirally wound around the outer peripheral surface of the tubular body 1 without applying an adhesive or the like. In (12), since the adhesive layer 10 is formed by extruding the rubber composition, the first planar body 12a is securely fixed on the tubular body 1 to form the first shielding layer 12. In the step (13), the second planar body 22a is spirally wound from above the adhesive layer 10 so as to cover two adjacent first planar bodies 12a in the first shielding layer 12. Two shielding layers 22 are formed.

Since the fuel hose 150 manufactured by the above manufacturing method has an advanced structure with the first shielding layer 12 and the second shielding layer 22, the fuel does not easily flow out of the hose and the fuel resistance is improved. .
Further, when the first shielding layer 12 and the second shielding layer 22 are bonded, the bonding between the tubular body 1 and the first shielding layer 12 and the bonding between the second shielding layer 22 and the protective layer 3 are performed by heat treatment (this Therefore, the fuel hose 150 having high production efficiency and good permeation resistance can be easily produced.

  Next, examples of the fuel hoses 100 and 150 of the present invention will be described in comparison with comparative examples.

(Example)
<Test target>
A fuel hose with a tubular body made of FKM (inner diameter 37.5 mm, thickness 0.5 mm) formed with a shielding layer made of FEP (thickness 0.075 mm) and a protective layer made of ECO (thickness 3.35 mm) ( (Hereinafter referred to as FEP hose) was produced according to the method for producing the fuel hose 100 of the present invention.
In addition, a tubular body made of FKM (inner diameter 37.5 mm, thickness 0.5 mm), first shielding layer made of FEP (thickness 0.075 mm), adhesive layer made of FKM (thickness 0.3 mm), FEP A fuel hose (hereinafter referred to as a two-layer FEP hose) formed with a second shielding layer (thickness: 0.075 mm) made of ECO and a protective layer made of ECO was produced according to the method for producing the fuel hose 150 of the present invention. The gap between the first shielding layers of the two-layer FEP hose was 5 mm.

On the other hand, for comparison, a tubular body made of FKM (inner diameter 37.5 mm, thickness 1.0 mm), a shielding layer made of THV (thickness 0.4 mm), and a protective layer made of ECO (thickness 2.85 mm) A fuel hose (hereinafter referred to as a THV hose) formed with the above was prepared under the same production conditions as described above.
The FEP hose, the two-layer FEP hose, and the THV hose have the same thickness, and the outer diameter is 46 mm.

<Flexibility test>
The FEP hose and THV hose are installed on a test stand having a semicircular portion with a radius of 42 mm as shown in FIG. 3A with the tip protruding by 300 mm, and vertically displaced from the natural state by 30 mm and 60 mm downward, respectively. The stress required for the measurement was measured (vertical displacement test). In addition, as shown in FIG. 3B, the torque when the 700 mm long FEP hose and the THV hose were rotationally displaced at angles of 10 degrees and 20 degrees, respectively, was measured (rotational displacement test). The test temperature was 23 ± 2 ° C. for both the vertical displacement test and the rotational displacement test. The results are shown in Table 1.

表１より、いずれの試験においても、ＦＥＰホースは、ＴＨＶホースよりも柔軟性が優れていることが分かる。このように、ＦＥＰホースは、ＴＨＶホースと比べて遮蔽層を薄くすることができるので、ＦＥＰ自体はＴＨＶよりも柔軟性が低いにもかかわらず、ホース全体としては、ＦＥＰホースは、ＴＨＶホースよりも柔軟性に優れている。

Table 1 shows that the FEP hose is more flexible than the THV hose in any test. Thus, since the FEP hose can make the shielding layer thinner than the THV hose, the FEP hose as a whole is less than the THV hose even though the FEP itself is less flexible than the THV. Also excellent in flexibility.

<Insertion force test>
The same FEP hose and THV hose used in the flexibility test were used. A pipe member having a pipe portion with an outer diameter of 38.2 mm and a bulge portion with an outer diameter of 39.8 mm is inserted into each hose at a speed of 50 mm / min at a test temperature of 23 ± 2 ° C., and the insertion force applied at that time is measured. did. Each of the FEP hose and the THV hose was tested three times, and the average value of the insertion force was determined. The results are shown in Table 2.

表２より、ＦＥＰホースは、ＴＨＶホースよりも小さい挿入力でパイプ部材に挿入できることが分かる。このため、ＦＥＰホースは、例えば、曲げホースを製造する場合において、本加硫処理前に行う芯部材の挿入作業が容易になるため、製造効率を向上させることができる。

From Table 2, it can be seen that the FEP hose can be inserted into the pipe member with a smaller insertion force than the THV hose. For this reason, when manufacturing a bending hose, for example, when the FEP hose is manufactured, the core member can be easily inserted before the vulcanization process, so that the manufacturing efficiency can be improved.

<Permeation resistance test>
The same FEP hose and THV hose used in the flexibility test were used. In this permeation resistance test, a test for a two-layer FEP hose was also conducted. Further, as a reference, a shielding layer (thickness 0.075 mm) made of FEP and a protective layer (thickness 2.85 mm) made of ECO are formed on a tubular body (thickness 1.0 mm) made of FKM. A similar test was performed on a non-bonded fuel hose (hereinafter referred to as an unbonded hose). The specific test method is as follows.

  Each hose (inner diameter: 37.5 mm, outer diameter: 46 mm, length: 210 mm) was filled with CE10 (isooctane 45 vol.%, Toluene 45 vol.%, Ethanol 10 vol.%) As a test fuel and incubated continuously at 40 ° C. did. Then, after one month from the start of incubation, the permeation amount of fuel for 24 hours at a constant temperature of 40 ° C. was measured. The results are shown in Table 3.

By the way, in general, for fuel permeability, for example, a sample is put in a sealed tank with a capacity of 20 liters and allowed to stand under a predetermined condition, and then the gas in the sealed tank is collected and the fuel concentration is measured by a gas chromatograph (FID). It is evaluated by doing. As the reference value, for example, the permeation amount of fuel per one fuel hose (inside diameter 37.5 mm, length 210 mm) per day is set to 15 mg / line / day or less. When this value is applied to the fuel hose used in this example and converted into the amount of fuel per 1 m ² per day, a joint with a length of 35 mm is connected to both ends of the fuel hose in the test. The length of one substantial test hose is 140 mm, and the fuel permeation amount is 909.5 mg / m ² / day or less. Incidentally, the THV hose (conventional product) used as a comparative example in the permeation resistance test of this example is designed to satisfy the above fuel permeation amount for 15 years from the start of use or a traveling distance of 150,000 miles or more.

表３より、ＦＥＰホース、及び２層ＦＥＰホースはＴＨＶホースよりも燃料の耐透過性が優れていることが分かる。また、ＦＥＰを遮蔽層として使用していても接着を行っていないホースでは、耐透過性が低下していることも分かる。なお、本発明の方法により製造したＦＥＰホース、及び２層ＦＥＰホースは、上記基準値を十分に満たしていることは明らかである。

From Table 3, it can be seen that the FEP hose and the two-layer FEP hose have better fuel permeation resistance than the THV hose. It can also be seen that the permeation resistance of the hose that is not bonded even when FEP is used as the shielding layer is lowered. In addition, it is clear that the FEP hose manufactured by the method of the present invention and the two-layer FEP hose sufficiently satisfy the above standard value.

  Further, the permeation resistance of the fuel as the FKM material was also measured. That is, CE10 as a fuel is put into a cup, each is sealed with FKM sheets (thickness 1 mm) having different fluorine contents, and continuously incubated at 40 ° C. for one month, and then the permeation amount of fuel for 24 hours at 40 ° C. It was measured. As a result, as shown in Table 4, when any FKM is used, the fuel permeation amount is low and the permeation resistance is excellent, but when the fluorine content increases, the fuel permeation amount tends to decrease. The fluorine content is 68 wt. It has been found that the fuel permeation amount is particularly low when the ratio is greater than 1%.

(Another embodiment)
FIG. 4 shows a fuel hose 200 according to another embodiment of the present invention. This fuel hose 200 uses FKM as the tubular body 1, FEP as the shielding layer 2, and ECO as the protective layer 3. Further, in this fuel hose 200, an aramid fiber layer as the reinforcing layer 4 and an ECO layer as the intermediate layer 5 serving as the foundation of the reinforcing layer 4 are provided between the shielding layer 2 and the protective layer 3. In the above embodiment, it has been described that the fuel hose 100 of the present invention has sufficient pressure resistance due to the spirally wound structure of the planar body 2a, but as described above, the reinforcing layer 4 has high strength having heat resistance. By providing the aramid fiber layer, the pressure resistance can be further improved. That is, the fuel hose 200 according to this embodiment can withstand extremely severe environments such as high temperature and high pressure, so that the application range is expanded.

  The aramid fiber layer may be layered by knitting aramid fiber yarns on the intermediate layer 5, or a cloth-shaped one may be bonded on the intermediate layer 5. Examples of fibers that can be used for the reinforcing layer 4 include polyester fibers and polyvinyl alcohol fibers in addition to the aramid fibers.

  As described above, the tubular body 1 can have a structure of two or more layers. For example, if the first rubber layer is FKM and a double tubular body is provided with AEM as the second rubber layer adjacent to the outside, AEM is excellent in heat resistance and oil resistance, so it is used near the engine. Suitable as a heat resistant high pressure hose. Moreover, although what is used for the protective layer 3 and the intermediate | middle layer 5 is not specifically limited, Since AEM will improve heat resistance and oil resistance more, it is further suitable.

  The fuel hose and the manufacturing method thereof of the present invention can be applied not only to a fuel hose such as an automobile, but also to a fuel hose used for, for example, an aircraft, a ship, a generator, an industrial machine, an agricultural machine, etc. Is possible. In addition, the present invention is used as a fuel hose for various engines, not only for engines for liquid fuels such as gasoline, alcohol, light oil and heavy oil, but also for supplying gaseous fuel such as methane gas and propane gas used in gas engines. It is also possible to do.

Schematic showing the configuration of the fuel hose according to the first embodiment of the present invention. Schematic showing the configuration of a fuel hose according to a second embodiment of the present invention. Illustration of flexibility test Schematic showing the configuration of a fuel hose according to another embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tubular body 2 Shielding layer 2a Planar body 2b Overlapping part 3 Protective layer 10 Adhesive layer 12 First shielding layer 12a First planar body 22 Second shielding layer 22a Second planar body

Claims (11)

A tubular body mainly composed of rubber having fuel resistance;
From tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), and tetrafluoroethylene-ethylene copolymer (ETFE) The main component is one selected from the group consisting of a shielding layer formed by spirally winding a surface-treated planar body so that a part thereof overlaps the outer peripheral surface of the tubular body,
A fuel hose in which an overlapping portion of the planar body is bonded through a rubber composition or a coupling agent. A tubular body mainly composed of rubber having fuel resistance;
From tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), and tetrafluoroethylene-ethylene copolymer (ETFE) A first shielding layer formed by spirally winding a surface-treated first planar body on the outer peripheral surface of the tubular body, the main component being one selected from the group consisting of:
A second planar body having a surface selected as a main component and one surface selected from the group so as to cover two adjacent first planar bodies in the first shielding layer. A second shielding layer spirally wound around the outside of the layer,
The fuel hose which adhere | attached the said 1st shielding layer and the said 2nd shielding layer through the rubber composition.   The tubular body is selected from the group consisting of fluoro rubber (FKM), epichlorohydrin rubber (ECO), nitrile rubber (NBR), blend polymer of nitrile rubber (NBR) and polyvinyl chloride (PVC), and derivatives thereof. The fuel hose according to claim 1 or 2, wherein one of the components is a main component.   The tubular body includes a first rubber layer mainly composed of fluoro rubber (FKM), an outer side of the first rubber layer, epichlorohydrin rubber (ECO), nitrile rubber (NBR), and nitrile rubber (NBR). The fuel hose according to claim 1 or 2, further comprising a second rubber layer mainly composed of one selected from the group consisting of a polymer blended with polyvinyl chloride (PVC).   The fluoro rubber (FKM) has a fluorine content of 68 wt. The fuel hose according to any one of claims 1 to 4, wherein the fuel hose is at least%.   The fuel hose according to any one of claims 1 to 5, wherein a protective layer mainly composed of rubber is provided as an outermost layer.   The rubber composition includes fluorine rubber (FKM), nitrile rubber (NBR), epichlorohydrin rubber (ECO), acrylic rubber (ACM), ethylene acrylic rubber (AEM), nitrile rubber (NBR) and polyvinyl chloride (PVC). The fuel hose according to any one of claims 1 to 6, comprising as a main component one selected from the group consisting of blend polymers of the above and derivatives thereof.   2. The fuel hose according to claim 1, wherein the coupling agent is mainly composed of one selected from the group consisting of a silane coupling agent and a titanate coupling agent. 2. The fuel hose according to claim 1, wherein the planar body has a thickness of 0.025 to 0.2 mm, and a width of an overlapping portion of the planar bodies is less than or equal to a half of a width of the planar body. . From tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), and tetrafluoroethylene-ethylene copolymer (ETFE) A step of applying a rubber composition or a coupling agent to both surfaces of a surface-treated planar body, the main component being one selected from the group consisting of:
A step of forming a shielding layer by spirally winding the planar body on the outer peripheral surface of a tubular body formed by extruding rubber having fuel resistance into a tubular shape, and
Providing a protective layer by extruding rubber on the outside of the shielding layer;
The rubber constituting the tubular body and the rubber constituting the protective layer are vulcanized by heat treatment, and the shielding layer, the tubular body and the protective layer are bonded, and the overlapping portion of the planar body is bonded. A method of manufacturing a fuel hose including the steps. From tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), and tetrafluoroethylene-ethylene copolymer (ETFE) The first shield is formed by spirally winding the surface-treated first planar body made of one selected from the group consisting of the outer peripheral surface of a tubular body formed by extruding fuel-resistant rubber into a tubular shape. Forming a layer;
Providing an adhesive layer by extruding a rubber composition on the outside of the first shielding layer;
The second planar body, which is mainly treated with one selected from the group so as to cover the two adjacent first planar bodies in the first shielding layer, is subjected to the adhesive layer. Forming a second shielding layer by spirally winding the first shielding layer on the outside,
Providing a protective layer by extruding rubber on the outside of the second shielding layer;
The rubber constituting the tubular body and the rubber constituting the protective layer are vulcanized by heat treatment, and the tubular body, the first shielding layer, the adhesive layer, the second shielding layer, and the protective layer are bonded. A method of manufacturing a fuel hose including the steps.

Images