JPWO2009063980A1 - Fluid transfer tube with heating function and method for manufacturing the same - Google Patents

Abstract

A fluid transfer tube formed of a resin material in the process of molding a fluid transfer tube body with a resin or rubber material, transporting the molded tube body at a constant speed, and then continuously winding the tube body. A cord-like heater is arranged along the outer periphery of the main body, and then a plurality of thread-like members are knitted around the tube main body, and the outer peripheral surface of the tube main body on which the cord-like heater is arranged is continuously covered along the longitudinal direction. At the same time, a heat insulating layer having a braided structure for fixing the cord-like heater so as to be in contact with the outer peripheral surface of the tube main body is formed.

Description

  The present invention relates to a fluid transfer tube with a heating function for transferring a fluid while heating it, and a method for manufacturing the same.

  Conventional fluid transfer tubes with a heating function are generally fixed by covering a tube main body together with the tube main body formed of a resin material, a cord-like heater disposed around the tube main body, and the cord-like heater. It has a structure comprising a sheet-like member such as aluminum, a heat insulating layer made of a polyester nonwoven fabric or the like disposed around the sheet member, and a protective cover disposed on the outermost layer so as to cover the entire heat insulating layer ( For example, see Patent Document 1).

JP 2002-246157 A

  Thus, the conventional fluid transfer tube has a multilayered structure. Therefore, in the manufacturing process of the fluid transfer tube, the arrangement of the cord-like heater on the tube body, the fixing of the cord-like heater by the sheet-like member, the arrangement of the heat-insulating layer made of non-woven fabric, the fixing of the heat-insulating layer by the protective cover, etc. Thus, it is necessary to carry out the above various processes while handling a wide variety of members having different characteristics. For these reasons, the conventional fluid transfer tube is mainly handled manually, for example, with respect to the tube main body formed in a unit length of about several meters in consideration of its handleability. The actual situation is that it is manufactured through various processes.

  As described above, in the manufacture of the fluid transfer tube, the fluid transfer tube is manufactured in a unit length of several meters in consideration of the efficiency of the manual work. There are cases where it is difficult to obtain, and there is a problem that the manufacturing cost increases in order to cope with such a length.

  Moreover, in the fluid transfer tube in which such a cord-like heater is incorporated, if the cord-like heater is not reliably in contact with the outer peripheral surface of the tube body, the heating effect is reduced. The conventional tube employs a structure in which the cord-like heater is fixed to the outer peripheral surface of the tube main body by a sheet-like member. For example, when the tube is bent, the cord-like heater partially extends from the outer peripheral surface of the tube main body. You may leave. In such a case, there may be a case where the fluid to be transferred cannot be reliably heated, and the fluid transfer tube with a heating function can perform stable heating for maintaining the intended fluid performance. There is a problem that you can not.

  Furthermore, for tube bodies, if the fluid is a chemical or aqueous solution with relatively severe conditions such as corrosion resistance (or chemical resistance) such as acid, alkali, or organic solvent, the tube body may differ depending on the material. There is also a problem that cracks are generated due to deterioration and the fluid leaks and the purpose of transferring the fluid cannot be achieved, or the chemical solution or water permeates through the tube body and adversely affects the cord heater. Since such a problem tends to become conspicuous when the fluid is heated by the heater, it is strongly hoped that a tube body having excellent chemical resistance and low permeability, that is, a fluid transfer tube can be provided at low cost. It is rare. In particular, when the fluid contains urea, for example, in the case of urea water, chemical resistance is particularly required, and a material for a wetted part suitable as a fluid transfer tube suitable for this is desired.

Accordingly, a first object of the present invention is to solve the above-described problem, and to manufacture a fluid transfer tube with a heating function having a desired length desired by a user while suppressing an increase in cost. Another object of the present invention is to provide a fluid transfer tube with a heating function capable of obtaining a stable heating effect and a method for manufacturing the same.
A second object of the present invention is to provide a long-term reliable fluid transfer tube with a heating function and a method for manufacturing the same while suppressing an increase in cost.
The third object of the present invention is to provide a fluid transfer tube with a heating function that is excellent in chemical resistance, particularly when the fluid is a urea-containing fluid.

  In order to achieve the above object, the present invention is configured as follows.

According to the first aspect of the present invention, a fluid transfer tube body formed of a resin or rubber material;
A cord-like heater disposed along the outer peripheral surface of the tube body;
A heat insulating layer that is arranged so as to cover the outer peripheral surface of the tube main body in which the cord-like heater is arranged, and has a braided structure with a thread-like member continuous along the longitudinal direction of the tube main body;
There is provided a fluid transfer tube with a heating function, comprising a protective cover that covers the heat retaining layer.

  According to the second aspect of the present invention, the cord heater is spirally disposed on the outer peripheral surface of the tube main body, and the cord heater is arranged on the outer periphery of the tube main body by the elasticity of the braided structure of the heat retaining layer. The tube for fluid transfer with a heating function according to the first aspect, which is fixed so as to be in contact with a surface, is provided.

  According to a third aspect of the present invention, there is provided the fluid transfer tube with a heating function according to the first aspect, wherein the thread-like member is formed of synthetic fiber or glass fiber.

  According to the fourth aspect of the present invention, the fluid transfer tube main body has a single layer or a multilayer structure, and includes at least a layer formed of fluororesin, fluororubber, or a mixture thereof. A fluid transfer tube with a heating function described in 1. is provided.

  According to a fifth aspect of the present invention, the fluid transfer tube body has a heating function according to the first aspect, and has a multilayer structure including a layer formed of a polyamide resin and a layer formed of a fluororesin. A fluid transfer tube is provided.

  According to a sixth aspect of the present invention, there is provided the fluid transfer tube with a heating function according to the fourth aspect or the fifth aspect, wherein the fluororesin has an adhesive functional group.

  According to a seventh aspect of the present invention, there is provided the fluid transfer tube with a heating function according to the first aspect, wherein the fluid transfer tube is used for transferring a liquid containing urea water as a fluid.

According to the eighth aspect of the present invention, the cord-like heater is disposed along the outer peripheral surface of the fluid transfer tube body formed of resin or rubber material,
Thereafter, a plurality of thread-like members are knitted around the tube main body to continuously cover the outer peripheral surface of the tube main body on which the cord-like heater is arranged along the longitudinal direction, and the cord-like heater is covered with the tube. Provided is a method of manufacturing a fluid transfer tube with a heating function, which forms a heat insulating layer having a braided structure that is fixed so as to be in contact with the outer peripheral surface of a main body.

According to the ninth aspect of the present invention, while transporting the tube body at a constant speed in the longitudinal direction, the cord heater is disposed on the outer peripheral surface of the tube body,
The method for producing a fluid transfer tube with a heating function according to the eighth aspect, wherein the heat retaining layer having the braided structure is formed on the outer peripheral surface of the tube main body while continuing the conveyance at the constant speed. .

According to the tenth aspect of the present invention, the tube body for fluid transfer is molded with a resin material, the molded tube body is conveyed at a constant speed, and then the tube body is continuously wound up.
The fluid transfer tube with a heating function according to the eighth aspect, wherein the step of arranging the cord-like heater on the outer peripheral surface of the tube body and the step of forming the heat retaining layer having the braided structure are continuously performed. A manufacturing method is provided.

  According to an eleventh aspect of the present invention, the heating function according to the eighth aspect, wherein after the heat insulating layer is formed on the outer peripheral surface of the tube body, a protective cover is continuously formed so as to cover the heat insulating layer. Provided is a method of manufacturing a tube for attaching a fluid.

  According to a twelfth aspect of the present invention, there is provided the method for manufacturing a fluid transfer tube with a heating function according to the eighth aspect, wherein a thread-like fiber formed of synthetic fiber or glass fiber is used as the thread-like member.

  According to a thirteenth aspect of the present invention, the fluid transfer tube body is molded to have a single layer or multilayer structure including at least a layer formed of a fluororesin, a fluororubber, or a mixture thereof. The manufacturing method of the tube for fluid transfer with a heating function as described in an aspect is provided.

  According to a fourteenth aspect of the present invention, in the tenth aspect, the fluid transfer tube body is molded to have a multilayer structure including a layer formed of a polyamide resin and a layer formed of a fluororesin. The manufacturing method of the tube for fluid transfer with a heating function of description is provided.

  According to a fifteenth aspect of the present invention, there is provided the method for producing a fluid transfer tube with a heating function according to the thirteenth aspect or the fourteenth aspect, wherein the fluororesin has an adhesive functional group.

  According to a sixteenth aspect of the present invention, there is provided the method for producing a fluid transfer tube with a heating function according to the eighth aspect, wherein the fluid transfer tube is used for transferring a liquid containing urea water as a fluid. To do.

  According to a seventeenth aspect of the present invention, there is provided a fluid transfer tube with a heating function, wherein the fluid is a urea-containing fluid, and the contact portion with the fluid is formed by a fluororesin layer having an adhesive functional group. A fluid transfer tube with a heating function is provided.

  According to an eighteenth aspect of the present invention, the fluid with a heating function according to the seventeenth aspect, which has a laminated structure in which a non-fluorinated thermoplastic resin layer is disposed outside the fluororesin layer having the adhesive functional group. A transfer tube is provided.

  According to the present invention, since the heat insulation layer disposed so as to cover the fluid transfer tube body in which the cord-like heater is disposed on the outer peripheral surface thereof is formed as a knitted structure by the thread-like member, the knitted structure is With the mechanical structural elastic action, it is possible to obtain an effect that the cord-like heater is brought into close contact with the outer peripheral surface of the tube body. Therefore, heat can be transmitted to the fluid transferred by the tube body more effectively than the cord heater. In particular, even when the tube main body is bent, the cord-like heater can be made to follow the outer peripheral surface of the tube main body due to the elastic action of the braided structure, and stable for maintaining fluid performance A heating effect can be obtained.

  Also, after arranging the cord-shaped heater along the outer periphery of the tube main body, the outer peripheral surface of the tube main body on which the cord-shaped heater is arranged is continuous along the longitudinal direction by weaving a plurality of thread-like members around the tube main body. And a step of arranging the cord-like heater by adopting a manufacturing method of forming a heat insulating layer having a braided structure for fixing the cord-like heater so as to be in contact with the outer peripheral surface of the tube body. The step of forming the heat retaining layer for fixing the substrate can be performed continuously. That is, for example, for a tube body that is continuously fed and conveyed, first, a cord-shaped heater is disposed around the tube body, and then a plurality of thread-like members are knitted from the periphery of the tube body where the heater is disposed. A heat insulating layer for fixing can be continuously formed. Therefore, a tube for fluid transfer with a heating function is formed by performing a continuous process on a tube body of any length without providing a length restriction on the tube body due to the convenience of manual work as in the past. can do. Moreover, the workability | operativity (efficiency) can be improved by performing each process continuously in this way. Therefore, it is possible to manufacture a fluid transfer tube with a heating function having a desired length desired by the user while suppressing an increase in cost.

  Furthermore, by using a tube body having a single-layer or multi-layer structure excellent in chemical resistance and low permeability as the fluid transfer tube body, for example, a fluid such as a chemical solution can be used in a high temperature environment of 50 ° C. or higher. Even in such a case, a highly reliable fluid transfer tube with a heating function that can be used for a long period of time can be provided.

These aspects and features of the invention will become apparent from the following description, taken in conjunction with the preferred embodiments with reference to the accompanying drawings, in which: In this drawing,
FIG. 1 is a schematic perspective view showing the structure of a tube according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the tube of the present embodiment, FIG. 3 is a schematic diagram showing a braided structure of the heat retaining layer provided in the tube of the present embodiment, FIG. 4 is a schematic view of the tube manufacturing apparatus of the present embodiment, FIG. 5 is a flowchart of the manufacturing process of the tube of this embodiment, FIG. 6 is a measurement result table (materials 1 and 2) of the urea water immersion experiment, FIG. 7 is a measurement result table (materials 3 and 4) of the urea water immersion experiment.

  Before continuing the description of the present invention, the same parts are denoted by the same reference numerals in the accompanying drawings.

  Embodiments according to the present invention will be described below in detail with reference to the drawings.

  As an example of a fluid transfer tube with a heating function according to an embodiment of the present invention, a schematic perspective view (including a partially exploded cross section) showing a configuration of a fluid transfer tube 1 is shown in FIG. As shown in FIG.

  The fluid transfer tube 1 of the present embodiment (hereinafter simply referred to as “tube 1”) is a tube having a function of heating the fluid to be transferred. For example, in a cold district or the like, freezing prevention is performed. In order to maintain fluid performance, the fluid is heated to a predetermined temperature and the fluid is transferred.

  As shown in FIGS. 1 and 2, the tube 1 has a flow path for transferring a fluid therein, a tube main body 2 formed of a resin material, and the tube 1 on the outer peripheral surface of the tube main body 2. A cord-like heater 3 disposed along the longitudinal direction, a heat insulating layer 4 that covers the tube main body 2 together with the cord heater 3, and a protective cover 5 that covers the entire heat insulating layer 4 are provided.

  The tube body 2 is provided with heat resistance that can sufficiently withstand the temperature of the fluid heated by the cord-like heater 3 and the fluid to be transferred, and flexibility that can be adapted to various arrangement routes, that is, flexibility. ing. When the fluid to be transferred is a chemical solution or the like, it is desirable that at least the contact portion with the fluid has chemical resistance according to the specification of the fluid. The tube body 2 of the present embodiment has a two-layer structure in which, for example, a contact portion with a fluid is a layer formed of a fluorine-based resin material, and a layer formed of a non-fluorine-based thermoplastic resin material is disposed outside the layer. is doing. Specifically, as shown in FIGS. 1 and 2, an inner layer 21 formed of a fluororesin (adhesive fluororesin) having an adhesive functional group (Nephron EFEP RP5000 manufactured by Daikin Industries), and a non-fluorine-based one It has a two-layer structure with the outer layer 22 formed of a thermoplastic resin, for example, a polyamide resin (polyamide 12 bestamide X7297 manufactured by Daicel Degussa). The tube body 2 is formed with, for example, an outer diameter of 8 mm and an inner diameter of 6 mm.

  The cord-like heater 3 is composed of one heater wire 31 and two electric wires (heat-resistant electric wires) 32 for flowing a current through the heater wire 31. The heater wire 31 has a coating layer 31a formed of a fluororesin such as PFA or FEP in order to increase its resistance and ensure its electrical insulation. Similarly, each electric wire 32 also has a coating layer 32a formed of a fluororesin in order to ensure heat resistance and electrical insulation. Furthermore, as shown in FIG.1 and FIG.2, the heater wire 31 and each electric wire 32 are helically arrange | positioned along the outer peripheral surface of the tube main body 2, for example so that it may not mutually cross. Thus, since the cord-like heater 3 is arranged in a spiral shape, the bendability of the tube 1 can be kept good.

  The heat retaining layer 4 has both a function as a heat insulating layer and a function of fixing the cord-like heater 3 (the heater wire 31 and the electric wire 32) to the outer peripheral surface of the tube body 2. Here, the schematic diagram which expands and shows partially the structure of the heat insulation layer 4 is shown in FIG. As shown in FIG. 3, the heat insulating layer 4 has a knitted structure (or braid structure) that is combined by knitting a plurality of thread members 41 (or string members). Specifically, the thread-like member 41 that is an aggregate of synthetic fibers such as polyester fibers and fluororesin fibers and glass fibers having heat resistance with respect to the cord-like heater 3 is continuously combined according to a certain rule, for example. The knitting structure of FIG. 3 is formed by knitting. As shown in FIGS. 1 and 3, such a braided structure is formed by a series of a plurality of thread-like members 41 continuous along the longitudinal direction of the tube body 2. By adopting such a braided structure, in addition to the elasticity that the thread-like member 41 itself has, the elasticity that the braided structure has in terms of mechanical structure can be obtained. With the heat retaining layer 4 having such elasticity, the cord-like heater 3 can be fixed in a state in which the cord-like heater 3 is reliably in contact with the outer peripheral surface of the tube body 2. From the viewpoint of the function of the heat insulating layer 4 as a heat insulating layer, the gap dimension W2 between the adjacent thread members 41 in the braided structure is preferably sufficiently smaller than the width dimension W1 of the thread member 41, and there is a gap. It is more preferable not to do so. However, it is preferable that such dimensions W1 and W2 are determined in consideration of the flexibility required for the tube 1.

  The protective cover 5 has a function of protecting the tube body 2, the cord-like heater 3, and the heat insulating layer 4 as a whole and a function of a heat insulating layer. For example, weather resistance such as nitrile foam rubber or fluorine foam rubber is used. And formed of a material having shock absorption resistance.

  Next, a method for manufacturing the tube 1 having such a structure will be described with reference to a schematic explanatory view of the manufacturing apparatus shown in FIG. 4 and a flowchart showing main steps of the manufacturing method shown in FIG.

  As shown in FIG. 4, the fluid transfer tube manufacturing apparatus 50 includes a tube body molding portion 51 that molds the tube body 2 by molding a resin material in order from the left side to the right side in the drawing, and the outer peripheral surface of the tube body 2. The heater wire placement portion 52 for placing the cord-like heater 3 along the wire, the thread-like member knitting portion 53 for forming the heat retaining layer 4 by knitting the plurality of thread-like members 41, and the injection molding by foaming the resin material. And a foam injection molding part 54 for forming the protective cover 5. Moreover, the tube main body 2 molded by the tube main body molding unit 51 continuously conveys the heater wire arrangement unit 52, the thread-like member knitting unit 53, and the foam injection molding unit 54 in order, and finally the tube 1 is A continuous winding unit 55 that continuously winds up is provided at the most downstream (right end in the drawing) of the tube manufacturing apparatus 50.

  The procedure for manufacturing the tube 1 in the tube manufacturing apparatus 50 having such a configuration will be specifically described.

  First, in step S1 of the flowchart of FIG. 5, the tube body is formed by resin molding. Specifically, in the tube body molding portion 51 of the tube manufacturing apparatus 50, the inner layer 21 is continuously formed by molding using EFEP, and the outer layer 22 is continuously formed by molding using polyamide resin. A tube body 2 having a two-layer structure is continuously formed. The tube body 2 formed in this way is continuously transported toward the heater wire placement portion 52 at a constant transport speed. In this embodiment, the case where the tube body 2 is formed in a two-layer structure will be described, but instead of such a case, a structure of three or more layers or a single-layer structure is adopted. Such a case may be used. In the case of adopting a single layer structure, for example, PFA or FEP can be used as the fluororesin material.

  Next, heater wires are arranged along the outer peripheral surface of the tube body 2 in step S2. The heater wire placement unit 52 includes a heater wire supply unit 521 accommodated in a state where the heater wire 31 is wound, and two electric wire supply units 522 accommodated in a state where the electric wire 32 is wound. Yes. One heater wire 31 is continuously supplied from the heater wire supply unit 521 and two electric wires are supplied so that the respective wires are arranged on the outer peripheral surface of the tube body 2 that is conveyed at a constant conveyance speed. Two electric wires 32 are continuously supplied from the section 522. Further, at the time of supplying each of such wires, the heater wire supply unit 521 and each of the wire supply units 522 are rotated at a constant speed around the tube body 2 as the rotation center. For example, while the tube main body 2 is transported by 0.5 m, the respective supply units 521 and 522 are integrally rotated once. As shown in FIG. 1, the heater wires 31 and the electric wires 32 are spirally arranged by arranging the respective wires on the outer peripheral surface of the tube body 2 while rotating the supply portions 521 and 522 in this way. The The tube main body 2 in a state where the respective lines are arranged is conveyed toward the thread-like member weaving portion 53 at a constant speed.

  Next, in step S3, the heat insulating layer 4 having a knitted structure with the thread-like member 41 is formed. The thread-like member weaving part 53 is provided with a plurality of thread-like member supply parts 531 accommodated in a state where the thread-like member 41 is wound. The thread-like members 41 supplied from the respective thread-like member supply portions 531 are continuously knitted around the tube body 2 in which the cord-like heater 3 that is transported at a constant transport speed is disposed, and is shown in FIG. A heat insulating layer 4 having a braided structure is formed. At the same time, the heat retaining layer 4 is continuously disposed on the outer peripheral surface of the tube body 2 along the longitudinal direction thereof. Thereby, the cord-like heater 3 simply placed on the outer peripheral surface of the tube main body 2 can be fixed in a state of being in contact with the outer peripheral surface. Further, the braiding of the thread-like member 41 is performed, for example, under conditions of 400 dtex / 400 filament and 125 sets / 1 inch. The tube main body 2 in a state in which the heat insulating layer 4 having a knitted structure is formed is conveyed toward the foam injection molding unit 54 at a constant speed.

  Next, in step S4, the protective cover 5 is formed so as to cover the entire heat insulating layer 4. In the foam injection molding portion 54, the protective cover 5 is formed by foaming and injection molding using, for example, nitrile rubber or fluorine rubber.

  Thereafter, the tube 1 continuously formed in this manner is continuously wound up by the continuous winding portion 55 and accommodated in a reel or the like. In this way, the tube 1 is manufactured.

  According to such a manufacturing method of the tube 1, the cord-like heater 3 is arranged in the process of continuously winding the tube body 2 continuously molded in the tube body molding part 51 by the continuous winding part 55. The respective steps of the step of forming, the step of forming the heat insulating layer 4 having the braided structure, and the step of forming the protective cover 5 can be successively performed. Therefore, the productivity can be remarkably improved and the quality of the product can be stabilized as compared with the case where the conventional manual operation is performed.

  Further, by continuously performing from the molding of the tube main body 2 to the winding of the tube 1, it is possible to eliminate the need for the tube main body to have a unit length of about several meters as in the past, and the length desired by the user. The tube 1 can be manufactured. That is, the tube 1 having a length of, for example, 10 meters or more, which has been difficult to manufacture conventionally, can be manufactured without any problem.

  Further, the heat insulating layer 4 arranged so as to cover the tube body 2 on which the cord-like heater 3 is arranged on the outer peripheral surface has a knitted structure with a plurality of thread-like members 41, so that the mechanical structure of the knitted structure is provided. The cord-like heater 3 can be fixed so as to be in close contact with the outer peripheral surface of the tube main body 2 by an elastic action. Even when the flexible tube 1 is bent, the corded heater 3 can be kept in close contact without being separated from the outer peripheral surface of the tube main body 2 due to the elasticity of the braided structure. Therefore, the heating function which the tube 1 has can be exhibited stably, and the reliability in fluid heating can be improved.

  In the above description of the embodiment, the case where the process from the step of molding the tube body 2 to the step of winding the tube 1 is performed as a series of steps has been described, but the present invention is only for such a case. It is not limited. Instead of such a case, for example, a process of continuously supplying and transporting a long tube body 2 formed by another manufacturing apparatus, and arranging a heater wire with respect to the tube body 2 and a braided structure Even in the case where only the process of forming the heat insulating layer 4 having heat is continuously performed, the effect of the present invention can be obtained.

Here, the material which forms the tube main body 2 is demonstrated in detail.
The tube body 2 may basically be a resin or a rubber, but it is chemical resistant, assuming a use environment where it will be in contact with a fluid in a high temperature state of, for example, 50 ° C. or more for a long period of time. It is preferable to use a material having excellent properties and low permeability.

  As the resin, polyamide resins such as polyamide 6, 66, 12, 11, 612, polyester resins such as PET, PBN, and PBT, non-fluorinated thermoplastic resins such as PPS resin, polyolefin resin, EPDM, silicon rubber, chloroprene rubber, Non-fluorinated rubbers such as styrene rubber and butadiene rubber can be employed. However, fluororesins and fluororubbers have excellent physical properties in terms of chemical resistance to chemicals and low permeability, and have a single layer or multiple layers having at least one material that is fluororesin, fluororubber, or a mixture thereof. It is more preferable that the tube has a structure. The tube body may have a laminated structure such as fluororesin / fluororesin, fluorine / fluororubber, a mixture of fluororesin and fluororubber / fluororubber.

  The fluororesin forming the fluororesin layer included in such a single layer or multilayer structure is a homopolymer or copolymer having a repeating unit derived from at least one fluorine-containing ethylenic monomer. Such a fluororesin may be obtained by polymerizing only a fluorine-containing ethylenic monomer, or by polymerizing a fluorine-containing ethylenic monomer and an ethylenic monomer having no fluorine atom. It may be. Moreover, such a fluororesin layer may contain 1 type of the above-mentioned fluororesins, and may contain 2 or more types.

The fluorine-containing ethylenic monomer is not particularly limited as long as it is an olefinically unsaturated monomer having a fluorine atom. For example, tetrafluoroethylene [TFE], vinylidene fluoride, chlorotrifluoroethylene [CTFE], fluorine Vinyl fluoride, hexafluoropropylene [HFP], hexafluoroisobutene, formula (1):
CH ₂ = CX ¹ (CF ₂ ) _n X ² (1)
(Wherein, X ¹ is H or F, X ² is H, F or Cl, and n is an integer of 1 to 10), and perfluoro (alkyl vinyl ether).

  The ethylenic monomer having no fluorine atom is preferably selected from ethylenic monomers having 5 or less carbon atoms from the viewpoint of maintaining heat resistance and chemical resistance. Examples of the monomer include ethylene, propylene, 1-butene, 2-butene, vinyl chloride, and vinylidene chloride.

  When the fluororesin uses a fluorine-containing ethylenic monomer and an ethylenic monomer having no fluorine atom, the monomer composition is 10 to 100 mol% (for example, 30 mol%). ˜100 mol%) and 0 to 90 mol% (for example, 0 to 70 mol%) of the ethylenic monomer having no fluorine atom.

  In the present invention, the fluororesin includes chlorotrifluoroethylene [CTFE] polymer, tetrafluoroethylene / hexafluoropropylene [FEP] copolymer, tetrafluoroethylene / perfluoro (alkyl vinyl ether) [PFA] copolymer. Examples thereof include a polymer, an ethylene / tetrafluoroethylene [ETFE] copolymer, an ethylene / tetrafluoroethylene / hexafluoropropylene [EFEP] copolymer, and a polyvinylidene fluoride [PVdF] polymer.

  The fluororesin may be a perhalopolymer. By using a perhalopolymer, chemical resistance and low permeability are further improved. A perhalopolymer is a polymer in which halogen atoms are bonded to all the carbon atoms constituting the main chain of the polymer. The fluororesin is preferably a CTFE polymer, FEP copolymer or PFA copolymer, and more preferably a CTFE polymer and an FEP copolymer from the viewpoint of flexibility and low permeability. These preferable fluororesins are excellent in low permeability to a mixed fluid such as alcohol fuel.

In the present invention, if the fluororesin has an adhesive functional group, the adhesiveness with the thermoplastic resin layer is improved, so that the tube body excellent in impact resistance and strength can be obtained. Examples of the adhesive functional group include a carbonyl group, a hydroxyl group, and an amino group. In the present specification, the “carbonyl group” is a carbon divalent group composed of a carbon-oxygen double bond, and is represented by —C (═O) —. The carbonyl group is not particularly limited. For example, a carbonate group, a carboxylic acid halide group (halogenoformyl group), a formyl group, a carboxyl group, an ester bond [—C (═O) O—], an acid anhydride bond [—C (= O) O—C (═O) —], isocyanate group, amide group, imide group [—C (═O) —NH—C (═O) —], urethane bond [—NH—C (═O ) O-], carbamoyl group [NH ₂ —C (═O) —], carbamoyloxy group [NH ₂ —C (═O) O—], ureido group [NH ₂ —C (═O) —NH—] , An oxamoyl group [NH ₂ —C (═O) —C (═O) —] and the like which are part of the chemical structure. A hydrogen atom bonded to a nitrogen atom such as an amide group, an imide group, a urethane bond, a carbamoyl group, a carbamoyloxy group, a ureido group, or an oxamoyl group may be substituted with a hydrocarbon group such as an alkyl group. The adhesive functional group is an amide group, a carbamoyl group, a hydroxyl group, a carboxyl group in that it is easy to introduce and the resin obtained has moderate heat resistance and good adhesion at a relatively low temperature. A carbonate group and a carboxylic acid halide group are preferable, and those having a carbonate group and / or a carboxylic acid halide group described in International Publication No. 99/45044 pamphlet are particularly preferable.

  When the fluororesin in the present invention has an adhesive functional group, it may be composed of a polymer having the adhesive functional group at either the main chain end or the side chain, It may consist of a polymer having both side chains. When the fluororesin has an adhesive functional group at the end of the main chain, the fluororesin may have at both ends of the main chain or only at one of the ends. When the adhesive functional group has an ether bond, the adhesive functional group may have the adhesive functional group in the main chain. The fluororesin is preferably made of a polymer having an adhesive functional group at the end of the main chain because it does not significantly reduce mechanical properties and chemical resistance, or because it is advantageous in terms of productivity and cost. As a method for introducing the adhesive functional group, the functional group-containing monomer as described above may be copolymerized or introduced as a polymerization initiator.

  In the present invention, the fluororesin is not particularly limited, but the melting point is preferably 160 to 270 ° C. The molecular weight of the fluororesin is preferably in a range where the mechanical properties, low permeability, etc. of the obtained molded product can be expressed. For example, the MFR at an arbitrary temperature in the range of about 230 to 350 ° C., which is a general molding temperature range of a fluororesin, is preferably 0.5 to 100 g / 10 min using the melt flow rate [MFR] as an index of molecular weight. . In this specification, melting | fusing point of each resin is calculated | required as temperature corresponding to the maximum value in a heat of fusion curve when it heats up at a speed | rate of 10 degree-C / min using a DSC apparatus (made by Seiko), MFR was measured using a melt indexer (manufactured by Toyo Seiki Seisakusho Co., Ltd.), and the weight (g) of the polymer flowing out in a unit time (10 minutes) from a nozzle having a diameter of 2 mm and a length of 8 mm under a load of 5 kg at each temperature. Is.

  The fluororesin can be obtained by a conventionally known polymerization method such as suspension polymerization, solution polymerization, emulsion polymerization or bulk polymerization. In the polymerization, each condition such as temperature and pressure, the polymerization initiator and other additives can be appropriately set according to the composition and amount of the desired fluororesin.

The fluororesin layer and / or the non-fluorinated thermoplastic resin layer that can be laminated with the fluororesin is an inorganic powder, glass fiber, carbon powder, carbon fiber, metal, as long as the performance is not impaired depending on the purpose and application. Various fillers such as oxides may be blended, and in addition to fillers, other optional additives such as heat stabilizers, reinforcing agents, fillers, UV absorbers, pigments, etc. It may be what you did. For example, in terms of fuel permeation reduction, smectite-based layered viscosity minerals such as montmorite, beidellite, saponite, nontronite, hectorite, soconite, stevensite, etc., and micro layered minerals with high aspect ratio such as mica are added. Also good. For example, in order to impart conductivity, a conductive filler may be added. The conductive filler is not particularly limited, and examples thereof include conductive simple powder such as metal and carbon or conductive simple fiber; powder of conductive compound such as zinc oxide; surface conductive powder. The conductive single powder or conductive single fiber is not particularly limited, and examples thereof include metal powders such as copper and nickel; metal fibers such as iron and stainless steel; carbon black, carbon fibers, and Japanese Patent Laid-Open No. 3-174018. Carbon fibrils and the like. The surface conductive treatment powder is a powder obtained by conducting a conductive treatment on the surface of a nonconductive powder such as glass beads or titanium oxide. The method for conducting treatment is not particularly limited, and examples thereof include metal sputtering and electroless plating. Among the conductive fillers described above, carbon black is preferably used because it is advantageous in terms of economy and prevention of electrostatic charge accumulation. When blending the conductive filler, it is preferable to prepare pellets by melting and kneading in advance. It is preferable that the volume resistivity of the conductive composition of the resin obtained by blending the conductive filler is 1 × 10 ⁰ to 1 × 10 ⁹ Ω · cm. A more preferred lower limit is 1 × 10 ² Ω · cm, and a more preferred upper limit is 1 × 10 ⁸ Ω · cm. When imparting conductivity, conductivity may be imparted only to the fluororesin in contact with the innermost fuel layer. In this case, a conductive fluororesin layer may be provided as an inner layer of the fluororesin layer.

Non-fluorinated thermoplastic resins that can be laminated with fluororesins include, for example, polyolefin resins, polyamide resins, modified polyolefin resins, polyvinyl resins, polyesters, ethylene / vinyl alcohol copolymers, polyacetal resins, polyurethane resins, polyphenylene oxide resins, Polycarbonate resin, acrylic resin, styrene resin, acrylonitrile / butadiene / styrene resin [ABS], vinyl chloride resin, cellulose resin, polyether ether ketone resin [PEEK], polysulfone resin, polyether sulfone resin [PES], Examples include polyetherimide resins and polyphenylene sulfide resins. Of these, polyolefin resins, polyamide resins, and modified polyolefin resins are preferred in terms of flexibility, adhesiveness, moldability, and the like. Preferably, ethylene / vinyl alcohol resins are preferable in view of adhesiveness and low fuel permeability. Examples of the polyolefin resin include propylene homopolymer, propylene-ethylene block copolymer, low density polyethylene, medium density polyethylene, and high density polyethylene. Examples of the modified polyolefin resin include propylene homopolymers such as maleic acid modification, epoxy modification, and amine (NH ₂ ) modification, propylene-ethylene block copolymers, low density polyethylene, medium density polyethylene, and high density polyethylene.

  The polyamide-based resin is made of a polymer having an amide bond [—NH—C (═O) —] as a repeating unit in the molecule. As the polyamide-based resin, a so-called nylon resin composed of a polymer in which an amide bond in a molecule is bonded to an aliphatic structure or an alicyclic structure, or a polymer in which an amide bond in a molecule is bonded to an aromatic structure. Any of so-called aramid resins may be used. Nylon resin is not particularly limited. For example, nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66, nylon 66/12, nylon 46, metaxylylenediamine / adipic acid What consists of polymers, such as a polymer, is mentioned, You may use combining 2 or more types from these.

The amine value of the polyamide-based resin may be 10 to 60 (equivalent / 10 ⁶ g). Moreover, a preferable minimum may be 15 (equivalent / 10 < ⁶ > g), a preferable upper limit may be 50 (equivalent / 10 < ⁶ > g), and a more preferable upper limit may be 35 (equivalent / 10 < ⁶ > g). In the present specification, the amine value is a value obtained by heating and dissolving 1 g of a polyamide-based resin in 50 ml of m-cresol, and titrating with 1/10 N p-toluenesulfonic acid aqueous solution using thymol blue as an indicator. Unless otherwise specified, it means the amine value of the polyamide-based resin before lamination.

  As a method for producing a laminated resin tube, for example, (1) a plurality of thermoplastic resins are co-extruded in a molten state, and the layers are thermally fused (melt-bonded) to form a multi-layer laminate in one step. (2) Once the thermoplastic resin is extruded into a tube shape by an extruder, surface treatment such as corona discharge or plasma discharge is performed, and then a crosshead die is used to heat Examples thereof include a method of forming a laminate tube by extruding a plastic resin on its surface using an extruder. It is more preferable in terms of production efficiency to form by coextrusion molding (1). Examples of the coextrusion molding (1) include conventionally known multilayer co-extrusion manufacturing methods such as a multi-manifold method and a feed block method. It can be set as a tube-shaped laminated body by shape | molding by these methods.

  The thermoplastic resin layer may contain only one kind of the above-mentioned thermoplastic resin, or may contain two or more kinds. In the present invention, the thermoplastic resin preferably has a melting point of 100 to 270 ° C.

  The crosslinked fluororubber used in the present invention is not particularly limited as long as at least a part of at least one fluororubber composition is crosslinked. Examples of the fluororubber include perfluorofluororubber, non-perfluorofluororubber, and fluorine-containing thermoplastic elastomer. Examples of the perfluorofluororubber include TFE / PAVE copolymers, TFE / hexafluoropropylene (hereinafter referred to as HFP) / PAVE copolymers, and the like. Examples of the non-perfluorofluororubber include VdF-based polymers and TFE / propylene-based copolymers, and these may be used alone or in any combination as long as the effects of the present invention are not impaired. it can.

  Moreover, what was illustrated as perfluoro fluororubber or non-perfluoro fluororubber is the structure of the main monomer, and what copolymerized the monomer for crosslinking, a modified monomer, etc. can be used suitably. As the crosslinking monomer or the modifying monomer, a known crosslinking monomer such as an iodine atom, bromine atom, or one containing a double bond, a transfer agent, a modified monomer such as a known ethylenically unsaturated compound, or the like can be used. .

  Specific examples of the VdF polymer include a VdF / HFP copolymer, a VdF / TFE / HFP copolymer, a VdF / TFE / propylene copolymer, a VdF / ethylene / HFP copolymer, Examples thereof include VdF / TFE / PAVE copolymers, VdF / PAVE copolymers, VdF / CTFE copolymers, and the like. More specifically, it is preferably a fluorine-containing copolymer composed of 25 to 85 mol% of VdF and 75 to 15 mol% of at least one other monomer copolymerizable with VdF, more preferably , A fluorine-containing copolymer comprising 50 to 80 mol% of VdF and 50 to 20 mol% of at least one other monomer copolymerizable with VdF.

  Here, as at least one other monomer copolymerizable with VdF, for example, TFE, CTFE, trifluoroethylene, HFP, trifluoropropylene, tetrafluoropropylene, pentafluoropropylene, trifluorobutene, tetra Examples thereof include fluorine-containing monomers such as fluoroisobutene, PAVE and vinyl fluoride, and non-fluorine monomers such as ethylene, propylene and alkyl vinyl ether. These can be used alone or in any combination.

  Among fluororubbers, from the viewpoint of heat resistance, compression set, workability, and cost, fluororubber containing VdF units is preferable, and fluororubber having VdF units and HFP units is more preferable.

  From the viewpoint of good compression set, it is preferably at least one rubber selected from the group consisting of VdF / HFP fluororubber, VdF / TFE / HFP fluororubber, and TFE / propylene fluororubber, From the viewpoint of low fuel permeability, VdF / TFE / HFP fluororubber is more preferable.

  The fluororubber used in the present invention can be produced by a usual emulsion polymerization method. What is necessary is just to determine suitably polymerization conditions, such as temperature at the time of superposition | polymerization, time, according to the kind of monomer, and the target elastomer. As the crosslinking system, any of a polyol crosslinking system, an organic peroxide crosslinking system, and a polyamine crosslinking system can be employed.

  In addition, a thermoplastic polymer composition that is a mixture of a fluororesin and a fluororubber can be used as a material constituting the tube body. For example, a thermoplastic polymer composition is obtained by dynamically crosslinking a fluororubber composition in the presence of a fluororesin under the melting conditions of the fluororesin. Here, dynamically crosslinking treatment means that rubber is dynamically crosslinked simultaneously with melt kneading using a Banbury mixer, a pressure kneader, an extruder, or the like. Among these, it is preferable to use an extruder such as a twin screw extruder because a high shear force can be applied. By dynamically performing the crosslinking treatment, the phase structure of the fluororesin and the crosslinked fluororubber and the dispersion of the crosslinked fluororubber can be controlled.

  In order to crosslink at least one fluororubber composition to the thermoplastic polymer composition of the present invention, it is preferable to further add a crosslinking agent. As a crosslinking agent, it can select suitably according to the kind and melt-kneading conditions of the fluororubber composition to bridge | crosslink.

  The cross-linking system used in the present invention may be appropriately selected depending on the type of the cure site or the use of the molded product obtained when the fluororubber contains a cross-linkable group (cure site). As the crosslinking system, any of a polyol crosslinking system, an organic peroxide crosslinking system, and a polyamine crosslinking system can be employed.

  In addition, the thermoplastic polymer composition of the present invention includes a fluororesin and a crosslinked fluororubber in a part of a structure in which the fluororesin which is a preferred form forms a continuous phase and the crosslinked fluororubber forms a dispersed phase. The co-continuous structure may be included.

  The weight ratio of the fluororesin and the cross-linked fluororubber is 98/2 to 10/90, and preferably 95/5 to 20/80. When the fluororesin is less than 10% by weight, the fluidity of the resulting thermoplastic polymer composition tends to deteriorate and the molding processability tends to deteriorate, and when it exceeds 98% by weight, the resulting thermoplastic polymer composition is obtained. There is a tendency for the balance between the flexibility of the object and the fuel permeability to deteriorate.

  In the thermoplastic polymer composition of the present invention, the fluororesin may contain an adhesive functional group. Moreover, since the thermoplastic polymer of this invention has thermoplasticity, it can be used for both the laminated resin tube and laminated rubber tube of this invention.

  Other non-fluorine rubber materials include natural rubber, isoprene rubber, butadiene rubber, styrene rubber, butyl rubber, ethylene / propylene rubber, ethylene / vinyl acetate rubber, chloroprene rubber, hibaron, chlorinated polyethylene rubber, epichlorohydrin rubber, It may be a case where a general-purpose rubber material such as trill rubber, acrylic rubber, urethane rubber, thiocol rubber, or silicon rubber is used.

  As a method for producing a laminated rubber tube, for example, after the rubber material is once extruded into a tube shape by an extruder, the rubber material is further extruded onto the surface using an extruder using a crosshead die. By forming a laminate tube and then co-crosslinking the rubber layers by the vulcanization, a tube-like laminate can be obtained.

  Since fluororesin and fluororubber are comparatively expensive materials, stacking with general-purpose resin or general-purpose rubber can reduce costs, and thus is more preferable. Therefore, the tube body preferably has a laminated structure such as fluororesin / general purpose resin, fluororesin / general purpose rubber, fluororubber / general purpose rubber, a mixture of fluororesin and fluororubber / general purpose rubber.

  When fluororesin, fluororubber, or a mixture thereof is used for the tube body, it is preferable to use these materials as the innermost layer of the tube body. When a solvent-based fluid is used, a conductive material may be used by adding carbon black or the like to the innermost layer resin or rubber. From the viewpoint of thermal stability, it is also preferable to use a fluororesin, fluororubber or a mixture thereof as the outermost layer in contact with the heater. It is also preferable to use fluororubber, fluorine or a mixture thereof for both the innermost layer and the outermost layer.

  It is to be noted that, by appropriately combining arbitrary embodiments of the various embodiments described above, the effects possessed by them can be produced.

  The fluid used for the fluid transfer tube with a heating function of the present invention is not particularly limited. For example, acid, alkali, solvent, gasoline, light oil, kerosene, urea water, gas, water, or the like is used as the fluid. Can do.

  In addition, the use of the fluid transfer tube of the present invention is not limited to the use, but it is possible to reduce the viscosity of the fluid by keeping warm and to flow smoothly, or a gas containing a condensable gas at least in part, It is suitable for applications that prevent fluid freezing. Specific examples include urea tubes for diesel vehicles, underground tubes, offshore applications, test and research tubes, and industrial tubes. Urea tubes for use are listed as preferred applications. In such diesel vehicle applications, the urea-containing fluid is excellent in chemical resistance as a transfer tube for urea water (for example, trade name: AdBlue (AdBlue) manufactured by Mitsui Chemicals, Inc.). It is preferable to employ the fluid transfer tube with a heating function of the present invention.

  When urea water is used as the fluid in the fluid transfer tube body of the fluid transfer tube with a heating function of the present invention, the material forming the layer of the contact portion with the urea water and the material resistance to the urea water are measured. The experiment was conducted.

As urea water, brand name: AdBlue (AdBlue) manufactured by Mitsui Chemicals, Inc. was used. As materials, the materials 1 and 2 used for the material forming the layer of the contact portion with the fluid in the fluid transfer tube of the present invention and the materials 3 and 4 to be compared with these materials were used.
Material 1: Adhesive fluororesin EFEP RP5000 (manufactured by Daikin Industries, Ltd.)
Material 2: Adhesive fluororesin ETFE EP7000 (manufactured by Daikin Industries, Ltd.)
Material 3: Polyamide 11
Rilsan PA11 BESNOP20TL (Arkema Co., Ltd.)
Material 4: EPDM (Irumagawa Rubber Co., Ltd. EP-5160 2mm thick sheet)

  Using materials 1, 2, and 3 pellets, a 30 mm extruder equipped with a coat hanger die was used to produce a 0.1 mm thick sheet by extrusion, and for material 4, a vulcanized 2 mm thick sheet was obtained. A micro dumbbell of ASTM D1708 was made by punching from this sheet. The created dumbbells were immersed (solution immersion) in urea water using a metallic cylindrical pressure vessel maintained at 70 ° C., and changes in tensile strength and tensile elongation with immersion time were measured. The immersion time was measured up to 2000 hours, and urea water was exchanged every 500 hours.

  The measurement results of the liquid immersion experiment for materials 1 and 2 are shown in FIG. Moreover, the measurement result of the liquid immersion experiment about the materials 3 and 4 is shown in FIG.

  As shown in the measurement results of FIG. 7, the tensile strength retention rate and the tensile elongation retention rate of the material 3 decreased to 71% and 65%, respectively, at an immersion time of 2000 hours. It can be seen that the retention rate and tensile elongation retention rate decreased to 86% and 53%, respectively, at an immersion time of 2000 hours.

  On the other hand, from the measurement results of FIG. 6, it can be seen that the tensile strength retention rate and the tensile elongation retention rate of the materials 1 and 2 are maintained at 88% or more at an immersion time of 2000 hours.

  From these experimental results, it can be said that the materials 1 and 2 have strong chemical resistance against urea water.

  Although the present invention has been fully described in connection with preferred embodiments with reference to the accompanying drawings, various variations and modifications will be apparent to those skilled in the art. Such changes and modifications are to be understood as being included therein, so long as they do not depart from the scope of the present invention according to the appended claims.

  The Japanese patent application No. 10 filed on November 15, 2007. Disclosure of the specification, drawings, and claims of Japanese Patent Application Laid-Open No. 2007-296656, and Japanese Patent Application No. 2006 filed on May 20, 2008. The disclosures of the specification, drawings, and claims of 2008-132179 are hereby incorporated by reference in their entirety.

Claims (18)

A fluid transfer tube body formed of a resin or rubber material;
A cord-like heater disposed along the outer peripheral surface of the tube body;
A heat insulating layer that is arranged so as to cover the outer peripheral surface of the tube main body in which the cord-like heater is arranged, and has a braided structure with a thread-like member continuous along the longitudinal direction of the tube main body;
A fluid transfer tube with a heating function, comprising a protective cover that covers the heat retaining layer.   The cord-like heater is spirally disposed on the outer peripheral surface of the tube body, and the cord-like heater is fixed to be in contact with the outer peripheral surface of the tube body by the elasticity of the braided structure of the heat retaining layer. The fluid transfer tube with a heating function according to claim 1.   The fluid transfer tube with a heating function according to claim 1, wherein the thread-like member is formed of synthetic fiber or glass fiber.   2. The fluid transfer tube with a heating function according to claim 1, wherein the fluid transfer tube main body has a single-layer or multi-layer structure, and includes at least a layer formed of fluororesin, fluororubber, or a mixture thereof. .   The fluid transfer tube according to claim 1, wherein the fluid transfer tube main body has a multilayer structure including a layer formed of a polyamide resin and a layer formed of a fluororesin.   The fluid transfer tube with a heating function according to claim 4 or 5, wherein the fluororesin has an adhesive functional group.   The fluid transfer tube according to claim 1, wherein the fluid transfer tube is used for transferring a liquid containing urea water as a fluid. A cord-like heater is disposed along the outer peripheral surface of the tube body for fluid transfer formed of resin or rubber material,
Thereafter, a plurality of thread-like members are knitted around the tube main body to continuously cover the outer peripheral surface of the tube main body on which the cord-like heater is arranged along the longitudinal direction, and the cord-like heater is covered with the tube. A method of manufacturing a fluid transfer tube with a heating function, wherein a heat insulating layer having a braided structure that is fixed so as to be in contact with an outer peripheral surface of a main body is formed. While transporting the tube body at a constant speed in the longitudinal direction, the cord heater is disposed on the outer peripheral surface of the tube body,
The method for producing a fluid transfer tube with a heating function according to claim 8, wherein the heat retaining layer having the braided structure is formed on an outer peripheral surface of the tube main body while continuing the conveyance at the constant speed. Molding the tube body for fluid transfer with a resin material, transporting the molded tube body at a constant speed, and then in the process of continuously winding the tube body,
The fluid transfer tube with a heating function according to claim 8, wherein the step of arranging the cord-like heater on the outer peripheral surface of the tube main body and the step of forming the heat retaining layer having the braided structure are continuously performed. Production method.   The method for producing a fluid transfer tube with a heating function according to claim 8, wherein a protective cover is continuously formed so as to cover the heat insulating layer after the heat insulating layer is formed on the outer peripheral surface of the tube body.   The manufacturing method of the tube for fluid transfer with a heating function of Claim 8 using the filamentous fiber formed with the synthetic fiber or the glass fiber as the said filamentous member.   The fluid transfer tube with a heating function according to claim 10, wherein the fluid transfer tube body is formed to have a single layer or a multilayer structure including at least a layer formed of a fluororesin, a fluororubber, or a mixture thereof. Tube manufacturing method.   The fluid transfer tube main body according to claim 10, wherein the fluid transfer tube body is molded to have a multilayer structure including a layer formed of a polyamide resin and a layer formed of a fluororesin. Production method.   The method for producing a fluid transfer tube with a heating function according to claim 13 or 14, wherein the fluororesin has an adhesive functional group.   The said fluid transfer tube is a manufacturing method of the fluid transfer tube with a heating function of Claim 8 used in order to transfer the liquid containing urea water as a fluid.   A fluid transfer tube with a heating function, wherein the fluid is a urea-containing fluid, and a contact portion with the fluid is formed of a fluororesin layer having an adhesive functional group.   The fluid transfer tube with a heating function according to claim 17, wherein the tube has a laminated structure in which a non-fluorinated thermoplastic resin layer is disposed outside the fluororesin layer having the adhesive functional group.

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