JP6484106B2 - Cold and hot water pipeline system - Google Patents

Description

  The present invention relates to a cold / hot water pipeline system.

  In a conventional piping system, the entire system is basically configured by connecting the same kind of pipes (see, for example, Patent Document 1). For example, there is a case where dissimilar pipe connection is unavoidable due to restrictions on the lineup of products and costs, etc., but dissimilar pipe connection has great disadvantages in that construction is difficult, while homogenous pipe connection is easy to construct and The same type pipe connection is actively adopted because of its great merit in terms of mechanical characteristics.

JP 2010-243129 A

  In the same type pipe connection, piping materials must be selected by paying attention to characteristics advantageous for the use of the piping system. Piping typically has both advantageous and disadvantageous properties for piping system applications. For example, piping having good characteristics in terms of strength tends to be inferior in terms of workability, and piping having good characteristics in terms of corrosion resistance tends to be inferior in terms of ease of handling. Therefore, a piping system configured by connecting pipes of the same kind cannot help but inherit characteristics that are advantageous to the use of the piping system as well as disadvantageous characteristics. In particular, in the case of a cold / hot water pipeline system having a temperature range exceeding 20 ° C., since the temperature condition to be applied is severe, the required characteristics are strict and selection of the pipe is extremely difficult.

  Therefore, an object of the present invention is to provide a cold / hot water pipeline system having excellent dimensional stability and improved workability.

(1)
The cold / hot water pipe piping system of this invention is a piping system for transporting cold / hot water whose temperature width is 20 degreeC or more. The cold / hot water pipe system of the present invention includes a fiber reinforced composite pipe containing polyolefin resin and glass fiber, a metal reinforced composite pipe containing polyolefin resin and metal, and a connecting member for connecting the fiber reinforced composite pipe and the metal reinforced composite pipe. ,including. The linear expansion coefficient of the fiber reinforced composite tube is 6 × 10 ⁻⁵ / ° C. or less. Furthermore, the capacity occupied by the fiber reinforced composite pipe is 70% or more of the total capacity of the fiber reinforced composite pipe and the metal reinforced composite pipe.

Thus, the cold / hot water pipeline system of this invention is comprised by occupying the capacity | capacitance of 70% or more of the low linear expansion fiber reinforced composite pipe whose linear expansion coefficient is ^6x10 < ^-5 > / degrees C or less. Excellent dimensional stability against changes in temperature of cold / hot water being transported. In addition to the workability of fiber reinforced composite pipes such as lightness and ease of cutting, the workability of metal reinforced composite pipes such as bending workability and ease of placement and connection in a narrow pipe space is also provided. Because it is equipped, it has improved workability as a whole piping system. Furthermore, since all the pipe lines excluding the joints are made of resin-based flexible pipes, they are excellent in earthquake resistance.

(2)
In the cold / hot water pipeline system of (1) above, the inner diameter of the fiber reinforced composite pipe may be 19 mm or more and the inner diameter of the metal reinforced composite pipe may be 75 mm or less.

In the cold / hot water pipeline system of (1), the inner diameter of the fiber reinforced composite pipe may be 50 mm or more and the inner diameter of the metal reinforced composite pipe may be 50 mm or less.
Thus, with the inner diameter of 50 mm as a boundary, a large-diameter pipe portion can be constituted by a fiber-reinforced composite pipe, and a small-diameter pipe portion can be constituted by a metal-reinforced composite pipe. Accordingly, it is possible to more preferably obtain processability such as ease of bending by the metal-reinforced composite pipe and ease of arrangement and connection in a narrow pipe space.

(3)
In the cold / hot water pipeline system according to (1) or (2), the connection member includes an electrofusion joint for connection to the fiber reinforced composite pipe and a screw coupling portion for connection to the metal reinforced composite pipe. And may include.

  This facilitates connection on the metal-reinforced composite pipe side, guarantees the characteristics even in a narrow pipe space, and enables highly reliable connection on the fiber-reinforced composite pipe side.

(4)
In the cold / hot water pipeline system according to (1) to (3) above, the fiber reinforced composite pipe includes at least the tubular first layer, the second layer, and the third layer in this order from the axial center to the outer periphery. May include. In this case, the first layer and the third layer contain a polyolefin resin as a main component, and the second layer contains a polyolefin resin and glass fibers. Furthermore, the ratio of the layer thickness of the second layer to the entire thick wall of the fiber-reinforced composite pipe is 0.3 or more.

  Thus, by configuring the ratio of the thickness of the fiber reinforced resin layer to 0.3 or more with respect to the entire thickness of the fiber reinforced composite pipe, dimensional stability can be more preferably obtained.

(5)
The average fiber diameter of the glass fiber may be 5 μm or more and 20 μm or less.
Thereby, strength, dimensional stability, and elongation at high temperature can be more preferably obtained.

An example of the cold / hot water pipe piping system of this invention is shown typically. FIG. 2 is a schematic exploded view showing connection between the fiber reinforced composite pipe 200 and the metal reinforced composite pipe 300 in FIG. 1. It is sectional drawing which shows the fiber reinforced composite pipe | tube 200 in FIG. 1 typically. It is sectional drawing which shows typically the metal reinforcement | strengthening composite pipe | tube 300 in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same elements are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[1. Configuration of cold / hot water pipeline system]
In FIG. 1, an example of the cold / hot water pipe piping system of this invention is shown typically. A cold / hot water pipe system 100 shown in FIG. 1 is used for cold / hot water pipes of air conditioning equipment. The cold / hot water pipeline system 100 includes a fiber reinforced composite pipe 200 and a metal reinforced composite pipe 300.

  The fiber reinforced composite pipe 200 occupies 70% or more of the total capacity of the capacity of the fiber reinforced composite pipe 200 and the capacity of the metal reinforced composite pipe 300. Since the fiber reinforced composite pipe 200 is excellent in dimensional stability, the cold / hot water pipeline system 100 is configured such that the capacity of the fiber reinforced composite pipe 200 occupies most of the total capacity, so that the cold / hot water to be transported is transported. Excellent dimensional stability against temperature changes.

  The fiber-reinforced composite pipe 200 is excellent in workability due to its light weight and easy cutting. In addition to this, the metal-reinforced composite pipe 300 is excellent in workability due to excellent bending workability and easy installation and connection even if the piping space is narrow. In the cold / hot water pipe system 100, these excellent workability synergistically improves the workability as a whole. Furthermore, since both the fiber reinforced composite pipe 200 and the metal reinforced composite pipe 300 are resin-based flexible pipes, the entire cold / hot water pipe piping system 100 is also excellent in earthquake resistance.

  The temperature range of the cold / hot water transported in the cold / hot water pipeline system 100 is 20 ° C. or more. The upper limit within the temperature range is not particularly limited because it varies depending on the heat-resistant temperature of the constituent resin of the fiber reinforced composite tube 200 and the metal reinforced composite tube 300, but is, for example, 105 ° C, preferably 95 ° C, more preferably 75 ° C. More preferably, it may be 55 ° C. The specific temperature of the cold / hot water is not particularly limited because it varies depending on the heat resistance temperature of the constituent resin of the fiber reinforced composite pipe 200 and the metal reinforced composite pipe 300, but for example, it is −5 ° C. or more and 60 ° C. or less for a polyethylene resin. For example, in the case of polypropylene resin, it may be −5 ° C. or higher and 90 ° C. or lower or −5 ° C. or higher and 100 ° C. or lower.

  The cold / hot water pipeline system 100 includes a hot water boiler 410, a refrigerator (absorption refrigerator in this embodiment) 420, a fan coil unit 430, and an expansion tank 440, and transports cold / hot water entering and exiting the fan coil unit 430. The entire pipeline is composed of a fiber reinforced composite pipe 200 and a metal reinforced composite pipe 300. In FIG. 1, a pipeline with an arrow indicating the direction of the cold / hot water toward the fan coil unit 430 indicates a forward path, and a pipeline with an arrow indicating the direction of the cold / hot water exiting the fan coil unit 430 is a return path. Indicates.

  In the cold / hot water pipeline system 100, the metal reinforced composite pipe 300 constitutes a pipe connected to a device (a fan coil unit 430 having a built-in coil in the present embodiment) including a folded portion of the forward and return paths of the cold / hot water. It is preferable. As shown in the cold / hot water pipeline system 100, the metal reinforced composite pipe 300 is connected to the fan coil unit 430 in both the forward path and the return path. Since the fan coil unit 430 including the return portion of the cool / warm water outward path and the return path is disposed in a narrow pipe space (for example, the ceiling), connecting with the metal reinforced composite pipe 300 is a work such as bending workability. From the viewpoint of sex. The metal reinforced composite pipe 300 connected to the fan coil unit 430 is connected to the fiber reinforced composite pipe 200 leading to the hot water boiler 410 or the refrigerator 420.

  As a connection aspect of the fiber reinforced composite pipe 200 and the metal reinforced composite pipe 300 connected to the fan coil unit 430, as shown in FIG. 1, a fiber reinforced composite branched from the fiber reinforced composite pipe 200 by a cheese type joint. A metal reinforced composite pipe 300 connected to the fan coil unit 430 may be coupled to the pipe 200.

The cold / hot water pipeline system 100 of this embodiment is a two-pipe cold / hot water system. The metal reinforced composite pipe 300 and the fiber reinforced composite pipe 200 connected thereto are used for transporting cold water and hot water. Is also used. The fiber reinforced composite pipe 200 is branched and communicated with a hot water pipe 510 connected to the hot water boiler 410 and a cold water pipe 520 connected to the refrigerator 420 by a three-way valve.
The cold / hot water pipeline system 100 further includes a cooling tower 450, and is connected to the refrigerator 420 by a cold water pipe 550.

  The hot water pipe 510, the cold water pipe 520, and the cold water pipe 550 are not necessarily configured by the fiber reinforced composite pipe 200 because the temperature difference between the hot water or the cold water to be transported is small. However, depending on the situation, there is a possibility that hot water higher than expected may flow in the hot water pipe 510, and the temperature of the pipe may vary greatly between when the air conditioning is stopped and when it is activated. (For example, when the outside air temperature is high, the cold water pipes 520 and 550 are warmed by the outside air temperature when the air conditioning is stopped, and the cold water pipes 520 and 550 are cooled when the air conditioning is activated. The normal water pipe (not having a fiber reinforced resin layer), such as when the air conditioning is stopped, the hot water pipe 510 is cooled by the outside air temperature, and when the air conditioning is activated, the hot water pipe 510 is warmed. In view of tube expansion / contraction assumed in the case of a resin tube), it is preferable that the resin tube is composed of a fiber reinforced composite tube 200.

[2. Variation of configuration of cold / hot water pipeline system]
In the present embodiment, an example of the cold / hot water pipe piping system of the air conditioner has been shown. However, in the present invention, for example, the heat source is selected from a refrigerator, a heat pump, a boiler, and the like, and the air conditioner is an air handling unit. Further, it may be a cold / hot water pipeline system with any combination selected from a fan coil unit, an induction unit, and the like. Among these, the present invention is particularly useful when a fan coil unit used in a portion where many fine branches exist is selected as an air conditioner.
Furthermore, the cold / hot water pipe piping system of the present invention includes a hot water supply / piping system for hot water heaters such as gas water heaters and hot water boilers, a hot water / water supply piping system for apartment houses and detached houses, a humidified water supply / piping system for humidifiers, It can also be applied to piping systems for ice heat storage type heat exchangers.

  In the present embodiment, a two-pipe cold water pipe system is illustrated, but the present invention may be a four-pipe cold water pipe system. The cold water pipe and the hot water pipe are independent and not shared, but the temperature of the pipe varies greatly between when the air conditioning is stopped and when the air is turned on. As with the piping system 100, a fiber reinforced composite pipe 200 is used.

  In the present embodiment, the metal reinforced composite pipe 300 is illustrated as an example where the branch pipe line from the fiber reinforced composite pipe 200 is communicated with the fan coil unit 430. However, in the present embodiment, the pipe space is narrow (for example, The present invention is also applied to a mode in which a part of piping is repaired with a metal-reinforced composite pipe 300 in a ceiling back, a wall back, and the like.

  As a connection mode between the fiber reinforced composite pipe 200 and the metal reinforced composite pipe 300 connected to the fan coil unit 430, in addition to those shown in the present embodiment, an elbow branched from the fiber reinforced composite pipe 200 by a cheese joint is used. On the other hand, the metal reinforced composite pipe 300 may be connected. Or the metal reinforcement | strengthening composite pipe | tube 300 may be directly connected with respect to the said cheese type coupling.

[3. Connection between fiber reinforced composite pipe and metal reinforced composite pipe]
In FIG. 2, the typical exploded view of the connection part of the fiber reinforced composite pipe and the metal reinforced composite pipe in the cold / hot water conduit piping system of this invention is shown. As shown in FIG. 2, the fiber reinforced composite tube 200 and the metal reinforced composite tube 300 can be connected via an electrofusion joint 290 and a caulking joint 390. In addition, as shown in FIG. 2, the terminal part of the fiber reinforced composite pipe 200 and the terminal part of the metal reinforced composite pipe 300 connected to each joint are respectively a heat insulating material (a heat insulating material 280 in FIG. There is no heat insulating material 380).

  The end portion of the fiber reinforced composite tube 200 is joined to the electrofusion joint 290. The electrofusion joint 290 has an electrofusion joint and a screw connection. The joint portion for electrofusion joins the fiber reinforced composite tube 200 by being electrofused in a state of being extrapolated to the end portion of the fiber reinforced composite tube 200. The screw connection portion is screwed and connected to a screw connection portion (described later) of a caulking joint 390 to which the metal reinforced composite pipe 300 is connected.

  The end portion of the metal reinforced composite tube 300 is joined to the caulking joint 390. The caulking joint 390 includes a caulking joint portion and a screw connection portion. The caulking joint portion is caulked in a state in which the end portion of the metal reinforced composite tube 300 is fitted, thereby joining the metal reinforced composite tube 300.

  After the fiber reinforced composite tube 200 and the metal reinforced composite tube 300 are connected via the electrofusion joint 290 and the caulking joint 390, by covering the portion where the heat insulating material has been deleted, The connecting portion can also be kept warm.

  In the present embodiment, the fiber reinforced composite pipe 200 and the metal reinforced composite pipe 300 are exemplified by the aspect in which the heat insulating material is coated from the beginning of the connection, except for the end portion involved in the joining. Not. For example, the fiber reinforced composite tube 200 and the metal reinforced composite tube 300 are both connected without any heat insulating material, and after the connection is completed, the entire fiber reinforced composite tube 200, the metal reinforced composite tube 300, and The connecting portion can be covered with a heat insulating material. Alternatively, after one of the fiber reinforced composite tube 200 and the metal reinforced composite tube 300 (for example, the fiber reinforced composite tube 200) is connected in a state that does not have any heat insulating material and the connection is completed, either one (for example, The entire fiber reinforced composite tube 200) and the connecting portion can be covered with a heat insulating material.

[4. Deformation mode of connecting portion of fiber reinforced composite pipe and metal reinforced composite pipe]
In this embodiment, the screw connection part of the electrofusion joint 290 on the fiber reinforced composite pipe 200 side is a female type, and the screw connection part of the caulking joint 390 on the metal reinforced composite pipe 300 side is a male type. The male and female of each screw connection portion may be reversed.

  In the present embodiment, an example in which the electrofusion joint 290 is an in-line type is illustrated, but a branched type may be used. When the electrofusion joint 290 is a branch type, two fiber reinforced composite tubes 200 and one metal reinforced composite tube 300 can be connected. In this case, the fiber reinforced composite pipe 200 can be branched by the branch type electrofusion joint 290 and the metal reinforced composite pipe 300 can be directly connected to the branch type electrofusion joint 290.

  In the present invention, the connection between the fiber reinforced composite pipe 200 and the metal reinforced composite pipe 300 may be a connection using a flange and a connection via a steel pipe, in addition to the above-described embodiment.

[5. Fiber reinforced composite pipe]
[5-1. Layer structure]
FIG. 3 is a cross-sectional view schematically showing the fiber-reinforced composite pipe 200 in FIG.
A fiber reinforced composite pipe 200 (multilayer molded body) shown in FIG. 3 includes a tubular first layer 210 (inner layer / molded body) and a tubular second layer 220 (intermediate layer / molded body) disposed outside the first layer 210. A molded body) and a tubular third layer 230 (outer layer / molded body) disposed outside the second layer 220. The second layer 220 is laminated in contact with the outer surface of the first layer 210, and the third layer 230 is laminated in contact with the outer surface of the second layer 220. The first layer 210, the second layer 220, and the third layer 230 are laminated in this order. The outer peripheral surface side of the third layer 230 is preferably covered with a heat insulating material 280. The heat insulating material 280 is configured by a structure having a large specific surface area. The heat insulating material 280 blocks the heat transfer between the cold / hot water transported in the fiber reinforced composite tube 200 and the external environment of the fiber reinforced composite tube 200, so that the cold / heat transported in the fiber reinforced composite tube 200. From the viewpoint of maintaining the temperature of the water and preventing condensation caused by the heat transfer (which can be a factor that significantly reduces the heat retaining property), the fiber reinforced composite pipe 200 is preferably provided.

  The first layer 210 includes a polyolefin resin. The first layer 210 does not substantially contain glass fibers as in the second layer 220 described later. The second layer 220 includes a polyolefin resin and glass fiber. That is, the second layer 220 is a molded body of a polyolefin resin composition containing a polyolefin resin and glass fibers. When the second layer 220 is a fiber reinforced resin, the fiber reinforced composite tube 200 is imparted with a low linear expansion performance, and good dimensional stability is obtained. The second layer 220 may further contain a compatibilizing agent. The third layer 230 includes a polyolefin resin. Similar to the first layer 210, the third layer 230 is substantially free of glass fibers. By including the polyolefin resin in the first layer 210, the second layer 220, and the third layer 230, the entire fiber reinforced composite pipe 200 has flexibility and good earthquake resistance can be obtained.

  The fiber reinforced composite tube 200 may further include a tubular adhesive layer 240 and a gas barrier layer 250 outside the first layer 210, the second layer 220, and the third layer 230. In this case, the adhesive layer 240 may be laminated in contact with the outer surface of the third layer 230, and the gas barrier layer 250 may be laminated in contact with the outer surface of the adhesive layer 240. In this case, the heat insulating material 280 is provided in contact with the outer peripheral surface of the gas barrier layer 250.

The gas barrier layer 250 includes a gas barrier resin. The gas barrier layer 250 is provided in order to improve the barrier property against the gas contacting the outer peripheral surface of the fiber reinforced composite pipe 200.
The adhesive layer 240 includes an adhesive resin. The adhesive layer 240 is provided to improve the adhesion between the third layer 230 and the gas barrier layer 250. The adhesive layer 240 is preferably tubular in contact with the entire outer peripheral surface of the third layer 230, but is not limited to this aspect. For example, the adhesive layer 240 may be axially and / or on the outer peripheral surface of the third layer 230. It may be partially arranged in the circumferential direction.

  The first layer 210 is the innermost layer of the fiber reinforced composite tube 200 and is in contact with cold / hot water transported through the fiber reinforced composite tube 200. In this embodiment, the gas barrier layer 250 is the outermost layer of the fiber reinforced composite pipe 200 and is exposed to the external environment. When the fiber reinforced composite tube 200 does not have the adhesive layer 240 and the gas barrier layer 250, the third layer 230 is the outermost layer of the multilayer molded body.

  In the present embodiment, in the fiber reinforced composite pipe 200, the first layer 210, the second layer 220, and the third layer 230 are laminated so as to be in direct contact with each other, but the present invention is not limited to this mode. The first layer 210 and the second layer 220 and / or the second layer 220 and the third layer 230 may be indirectly laminated through, for example, an adhesive layer.

  The fiber reinforced composite tube 200 is made of resin and glass fiber as described above, and does not include a metal layer like the metal reinforced composite tube 300. Since the fiber reinforced composite pipe 200 is light and easy to cut, it is excellent in workability.

[5-2. Thickness]
In the fiber reinforced composite tube 200, the ratio (R2) of the thickness of the second layer 220 to the thickness of the entire fiber reinforced composite tube 200 may be, for example, 0.3 or more and 0.8 or less. The ratio (R2) is preferably 0.5 or more and 0.8 or less, more preferably 0.55 or more and 0.75 or less. When the ratio (R2) is not less than the above lower limit, the dimensional stability is further improved. When the ratio (R2) is not more than the above upper limit, the fusibility and workability are further enhanced, and the impact resistance and the earthquake resistance are further enhanced.

  In the fiber reinforced composite tube 200, the ratio (R1) of the thickness of the first layer 210 to the thickness of the entire fiber reinforced composite tube 200 is preferably 0.1 or more, more preferably 0.12 or more, preferably 0. 3 or less, more preferably 0.25 or less, and still more preferably 0.23 or less. When the ratio (R1) is equal to or greater than the lower limit, the fusion property and workability are further enhanced, and the impact resistance and the earthquake resistance are further enhanced. When the ratio (R1) is not more than the above upper limit, the dimensional stability is further improved.

  In the fiber reinforced composite tube 200, the ratio (R3) of the thickness of the third layer 230 to the thickness of the entire fiber reinforced composite tube 200 is preferably 0.1 or more, more preferably 0.12 or more, and preferably 0.00. 3 or less, more preferably 0.25 or less, and still more preferably 0.23 or less. When the ratio (R3) is equal to or more than the lower limit, the fusion property and the workability are further improved, and the impact resistance and the earthquake resistance are further improved. Furthermore, when the fiber reinforced composite pipe 200 does not have the adhesive layer 240 and the gas barrier layer 250, the third layer 230 is the outermost layer, so that the reliability of electrofusion bonding is further enhanced. When the ratio (R3) is not more than the above upper limit, the dimensional stability is further improved.

  The total thickness of the first layer 210, the second layer 220, and the third layer 230 is preferably 1.5 mm or more, more preferably 3.5 mm or more, preferably 60 mm or less, more preferably 35 mm or less. When the thickness is not less than the above lower limit, rigidity, pressure resistance, and impact resistance are further enhanced. When the thickness is less than or equal to the above upper limit, lightness, secondary workability, and formability are further enhanced.

  When the fiber reinforced composite tube 200 includes other layers such as the adhesive layer 240 and the gas barrier layer 250 other than the first layer, the second layer, and the third layer as in the present embodiment, the total of the other layers The thickness may be configured to be, for example, not less than 0.002 and not more than 0.2, preferably not less than 0.003 and not more than 0.1, as a ratio to the thickness of the entire fiber reinforced composite tube 200. When the total thickness of the other layers is equal to or more than the above lower limit, the characteristics of the other layers can be effectively imparted to the fiber-reinforced composite pipe 200. When the total thickness of the other layers is not more than the above upper limit, the low linear expansion performance by the second layer 220 can be more effectively imparted to the fiber-reinforced composite tube 200. The total thickness of the adhesive layer 240 and the gas barrier layer 250 may be not less than 0.125 mm and not more than 0.4 mm.

  The thickness of the adhesive layer 240 is preferably 50 μm or more, more preferably 75 μm or more, preferably 200 μm or less, more preferably 150 μm or less. When the thickness of the adhesive layer 240 is not less than the above lower limit, the thickness control is further facilitated, and the adhesiveness is further enhanced. When the thickness of the adhesive layer 240 is not more than the above upper limit, the amount of material used is reduced, and the material cost is low and light.

The thickness of the gas barrier layer 250 is preferably 75 μm or more, more preferably 100 μm or more, preferably 200 μm or less, more preferably 150 μm or less. When the thickness of the gas barrier layer 250 is not less than the above lower limit, the thickness of the gas barrier layer 250 can be easily controlled, and the gas barrier property is further enhanced. When the thickness of the gas barrier layer 250 is not more than the above upper limit, the amount of material used is reduced, and the material cost is low and light.
In order to perform electrofusion bonding when the fiber reinforced composite tube 200 includes the gas barrier layer 250, the gas barrier layer 250 at the end portion of the fiber reinforced composite tube 200 is removed and the third layer 230 is exposed. Perform electrofusion bonding.

[5-3. composition]
The content of the polyolefin resin in 100% by weight of the second layer 220 is, for example, 45% by weight or more and 84% by weight or less, preferably 50% by weight or more and 79% by weight or less, more preferably 57% by weight or more, 73 The glass fiber content may be, for example, 15% by weight or more and 45% by weight or less, preferably 20% by weight or more and 40% by weight or less, more preferably 25% by weight or more and 35% by weight or less. The content of the compatibilizer may be 0.5% by weight or more and 10% by weight or less, preferably 2% by weight or more, and preferably 8% by weight or less.

  When the content of the polyolefin resin in the second layer 220 is not less than the above lower limit, the creep performance and the earthquake resistance are further improved. When the content of the polyolefin resin is not more than the above upper limit, the dimensional stability is further improved. When the glass fiber content is at least the above lower limit, the dimensional stability is further improved. When the glass fiber content is not more than the above upper limit, the creep performance becomes even better. Furthermore, when the content of the compatibilizer is not less than the above lower limit, the compatibility of each component is increased and the pressure resistance is further increased. When the content of the compatibilizer is not more than the above upper limit, the creep performance is further improved.

  In the first layer 210, the content of the polyolefin resin is preferably 90% by weight or more, more preferably 95% by weight or more, and preferably 100% by weight (total amount) or less. In the third layer 230, the content of the polyolefin-based resin is preferably 90% by weight or more, more preferably 95% by weight or more, and preferably 100% by weight (total amount) or less.

[5-4. component]
[5-4-1. Polyolefin resin]
The polyolefin resin used for the first layer 210, the second layer 220, and the third layer 230 is not particularly limited, and a known polyolefin resin can be used. As for polyolefin resin, only 1 type may be used and 2 or more types may be used together. The polyolefin resin used for each of the first layer 210, the second layer 220, and the third layer 230 may be the same resin or different resins. In consideration of adhesion between layers, it is preferable that the same resin is used for the layers adjacent to each other.

  Examples of the polyolefin resin include polyethylene, polypropylene, polybutene, ethylene-vinyl acetate copolymer, and ethylene-α-olefin copolymer. From the viewpoint of further effectively increasing the strength, dimensional stability and high-temperature elongation of the fiber-reinforced composite pipe 200 and / or from the viewpoint of further effectively improving the earthquake resistance due to flexibility, polyethylene or polypropylene is preferable. Polyethylene is more preferable.

  Examples of polyethylene (PE) include LDPE, LLDPE, and HDPE. Examples of polypropylene (PP) include homo PP, block PP, and random PP. Examples of polybutene include polybutene-1.

  The ethylene-α-olefin copolymer is about several mol% of α-olefin such as propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene or 1-octene with respect to ethylene. It is particularly preferable that the copolymer be copolymerized at a ratio of

  From the viewpoint of improving the hot internal pressure creep performance, the polyolefin resin has a constant stress value of 10.0 MPa or more at which the tube does not break for 50 years at 20 ° C., based on the long-term hydraulic strength obtained according to ISO / TR9080. More preferably, it is compatible with PE100.

[5-4-2. Glass fiber]
The glass fiber used for the second layer 220 is a short fiber having a fiber diameter of preferably 5 μm or more, preferably 20 μm or less, more preferably 15 μm or less. When the fiber diameter of the glass fiber is not less than the above lower limit and not more than the above upper limit, the strength, dimensional stability, and elongation at high temperature of the fiber reinforced composite tube 200 are effectively increased.

  The fiber diameter is an average value of the maximum diameters of the glass fibers included in the second layer 220.

  The glass fiber may be surface-treated. Examples of the surface treatment agent include methacryl silane, acrylic silane, amino silane, imidazole silane, vinyl silane, and epoxy silane. Aminosilane is preferred. The glass fiber is preferably surface-treated with aminosilane because it is more excellent due to the effects of the present invention.

[4-4-3. Compatibilizer]
Examples of the compatibilizer that may be used for the second layer 220 include maleic acid-modified polyolefin, silane-modified polyolefin, and chlorinated polyolefin. These compatibilizers are distinguished from the polyolefin resins described in the above-mentioned section of the polyolefin resin in terms of the configuration of the present invention. As for a compatibilizing agent, only 1 type may be used and 2 or more types may be used together.

  From the viewpoint of further effectively increasing the strength, dimensional stability, and elongation at high temperature of the fiber reinforced composite pipe 200, the compatibilizer is preferably maleic acid-modified polyolefin or silane-modified polyolefin.

[5-4-4. Adhesive resin]
Examples of the adhesive resin constituting the adhesive layer 240 include rubber-based hot melt adhesives and modified polyolefins (particularly modified polyethylene and modified polypropylene). Examples of the modified polyolefin include acid-modified polyolefin and silane-modified polyolefin. Examples of the modification of the modified polyolefin include modification by grafting and copolymerization. The acid-modified polyolefin is a polyolefin-based resin modified with an unsaturated carboxylic acid. Examples of the unsaturated carboxylic acid include acrylic acid, methacrylic acid, maleic acid, nadic acid, fumaric acid, itaconic acid, crotonic acid, citraconic acid, sorbic acid, mesaconic acid, angelic acid, and phthalic acid. Examples of the derivatives include acid anhydrides, esters, amides, imides, metal salts, and the like. For example, maleic anhydride, itaconic anhydride, citraconic anhydride, nadic anhydride, phthalic anhydride, methyl acrylate, Examples include methyl methacrylate, ethyl acrylate, butyl acrylate, maleic acid monoethyl ester, acrylamide, maleic acid monoamide, maleimide, N-butylmaleimide, sodium acrylate, and sodium methacrylate. Among these, unsaturated dicarboxylic acids and derivatives thereof are preferable, and maleic anhydride and phthalic anhydride are particularly preferable. Modified polyolefin may be used individually by 1 type, and may use 2 or more types together.

[5-4-5. Gas barrier resin]
Examples of the gas barrier resin constituting the gas barrier layer 250 include resins such as polyvinyl alcohol (PVA), ethylene vinyl alcohol copolymer (EVOH), polyvinylidene chloride resin (PVDC), and polyacrylonitrile (PAN). .

[5-4-6. Other ingredients]
The first layer 210, the second layer 220, the third layer 230, the adhesive layer 240, and the gas barrier layer 250 each include a thermoplastic resin other than the polyolefin-based resin as a subcomponent (that is, a component of less than 50% of the resin component). May be included.

  From the viewpoint of further enhancing the durability of the fiber reinforced composite pipe 200 at a high temperature or suppressing a decrease in durability due to a metal such as copper, the first layer 210, the second layer 220, and the third layer 230 are Each preferably contains an antioxidant. As for antioxidant, only 1 type may be used and 2 or more types may be used together.

  Examples of the antioxidant include hindered phenol antioxidants, phosphorus antioxidants, sulfur antioxidants, amine antioxidants, and lactone antioxidants.

  Examples of hindered phenol antioxidants include pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], thiodiethylenebis [3- (3,5-di-tert- Butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, N, N′-hexane-1,6-diylbis [3- (3 5-Di-tert-butyl-4-hydroxyphenyl) propionamide], benzenepropanoic acid, 3,5-bis (1,1-dimethylethyl) -4-hydroxy, C7-C9 side chain alkyl ester, 3,3 ', 3 ″, 5,5 ′, 5 ″ -hexa-tert-butyl-a, a ′, a ″-(mesitylene-2, , 6-triyl) tri-p-cresol, 4,6-bis (dodecylthiomethyl) -o-cresol, 4,6-bis (octylthiomethyl) -o-cresol, ethylenebis (oxyethylene) bis [3 -(5-tert-butyl-4-hydroxy-m-tolyl) propionate], hexamethylenebis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 1,3,5- Tris (3,5-di-tert-butyl-4-hydroxybenzyl) -1,3,5-triazine-2,4,6 (1H, 3H, 5H) -trione, 1,3,5-tris [( 4-tert-butyl-3-hydroxy-2,6-xylyl) methyl] -1,3,5-triazine-2,4,6 (1H, 3H, 5H) -trione, 2,6-di-ter -Butyl-4- [4,6-bis (octylthio) -1,3,5-triazin-2-ylamino] phenol, and diethyl [{3,5-bis (1,1-dimethylethyl) -4-hydroxyphenyl] } Methyl] phosphonate and the like.

  Phosphorus antioxidants include tris (2,4-di-tert-butylphenyl) phosphite, tris [2-[[2,4,8,10-tetra-tert-butyldibenzo [d, f] [ 1,3,2] dioxaphosphin-6-yl] oxy] ethyl] amine, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis [2,4-bis (1 , 1-Dimethylethyl) -6-methylphenyl] ethyl ester phosphorous acid and tetrakis (2,4-di-tert-butylphenyl) (1,1-biphenyl) -4,4′-diylbisphosphonite Etc.

  Examples of the lactone antioxidant include a reaction product of 3-hydroxy-5,7-di-tert-butyl-furan-2-one and o-xylene.

  From the viewpoint of further enhancing the durability of the fiber reinforced composite pipe 200 at a high temperature or suppressing a decrease in durability due to a metal such as copper, the first layer 210, the second layer 220, and the third layer 230 are provided. When the antioxidant is included, the antioxidant is preferably a phenol-based antioxidant, and more preferably a hindered phenol-based antioxidant. Only 1 type may be used for a phenolic antioxidant and a hindered phenolic antioxidant, and 2 or more types may be used together.

  From the viewpoint of further enhancing the durability of the fiber reinforced composite pipe 200 at a high temperature or suppressing a decrease in durability due to a metal such as copper, the antioxidant is 3- (3,5-di-tert. -Butyl-4-hydroxyphenyl) stearyl propionate or 2,4,6-tris (3 ′, 5′-di-tert-butyl-4′-hydroxybenzyl) mesitylene, preferably the polyolefin resin The composition is stearyl 3- (3,5-di-tert-butyl-4-hydroxyphenyl) stearyl propionate or 2,4,6-tris (3 ′, 5′-di-tert-butyl-4′-hydroxy Bencyl) mesitylene is preferred.

  In 100% by weight of the first layer 210, the second layer 220, and the third layer 230, the contents of the antioxidant, the phenolic antioxidant, and the hindered phenolic antioxidant are each preferably 0.01% by weight. % Or more, more preferably 0.1% by weight or more, preferably 5% by weight or less, more preferably 1% by weight or less, and still more preferably 0.5% by weight or less. When the content of the antioxidant, the phenolic antioxidant, and the hindered phenolic antioxidant is equal to or more than the above lower limit, the durability of the fiber-reinforced composite pipe 200 at a high temperature is further increased, and the above upper limit. When the content exceeds 50%, the durability of the fiber reinforced composite pipe 200 at high temperatures does not change. Therefore, when the content is not more than the above upper limit, use of an excessive antioxidant can be suppressed.

  The 1st layer 210, the 2nd layer 220, and the 3rd layer 230 may contain additives, such as a crosslinking agent, a copper harm prevention agent, a lubricant, a light stabilizer, and a pigment, as needed.

  Examples of the crosslinking agent include organic peroxides. Examples of the organic peroxide in the polyolefin resin composition include dicumyl peroxide, diisopropylbenzene hydroperoxide, and 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne. As for a crosslinking agent, only 1 type may be used and 2 or more types may be used together.

  The amount of organic peroxide used is not particularly limited. When an organic peroxide is used, the content of the organic oxide is preferably 0.01 parts by weight or more, preferably 2 parts by weight or less, more preferably 1 part by weight or less based on 100 parts by weight of the polyolefin resin. It is.

  The lubricant is not particularly limited, and examples thereof include a fluorine-based lubricant, a paraffin wax-based lubricant, and a stearic acid-based lubricant. Only 1 type may be used for a lubricant and 2 or more types may be used together.

  The amount of lubricant used is not particularly limited. The content of the lubricant is preferably 0.01 parts by weight or more and preferably 3 parts by weight or less with respect to 100 parts by weight of the polyolefin resin.

  The light stabilizer is not particularly limited, and examples thereof include salicylic acid ester-based, benzophenone-based, benzotriazole-based and cyanoacrylate-based ultraviolet absorbers, hindered amine-based light stabilizers, and the like. Only one type of light stabilizer may be used, or two or more types may be used in combination.

  The pigment is not particularly limited, and examples thereof include organic pigments such as azo, phthalocyanine, selenium, and dye lake, and oxides, molybdenum chromate, sulfide-selenide, ferrocyanide, and the like. An inorganic pigment etc. are mentioned. As for the pigment, only 1 type may be used and 2 or more types may be used together.

[5-5. Thermal insulation material]
Examples of the structure having a large specific surface area constituting the heat insulating material 280 include a porous material (for example, a resin foam) and a fibrous material (for example, a nonwoven fabric, a woven fabric, a single fiber body, a net-like body).

The foamed resin may be a polyolefin-based resin foam described above as the resin used for the first layer 210 and the third layer 230 from the viewpoint of heat insulation, flexibility, dimensional stability, ease of attachment, and the like. From the viewpoint of more effectively obtaining heat insulation, flexibility, dimensional stability, ease of attachment, and the like, a crosslinked product of the above-described polyolefin-based resin (cross-linked polyolefin-based resin) used as the resin used for the first layer 210 and the third layer 230. Resin).
The fibrous material may be an inorganic fiber such as glass fiber or carbon fiber, or an organic fiber such as natural fiber or resin fiber.

[5-6. Thermal expansion coefficient]
The coefficient of thermal expansion of the fiber reinforced composite tube 200 is 6 ⁻⁵ / ° C. or less, preferably 5.5 × 10 ⁻⁵ / ° C. or less, more preferably 5 × 10 ⁻⁵ / ° C. or less, and particularly preferably 4.5 × 10. ^{It is −5} / ° C. or lower, and most preferably 4 × 10 ⁻⁵ / ° C. or lower. When the thermal linear expansion coefficient of the fiber reinforced composite tube 200 is low, thermal expansion and contraction is less likely to occur in cold / hot water having a temperature range of 20 ° C. or higher flowing through the fiber reinforced composite tube 200.

  The thermal expansion coefficient is measured as follows. The fiber reinforced composite tube 200 is cut so that the length in the axial direction is 1 m, and an evaluation sample is obtained. The obtained evaluation sample is stored at 60 ° C. (Thot) for 2 hours, and the axial length (Lhot) at 60 ° C. immediately after storage is measured. Next, the same evaluation sample is stored at 5 ° C. (Tcool) for 2 hours, and the axial length (Lcool) at 5 ° C. immediately after storage is measured. The obtained value is substituted into Equation 1 below to calculate the coefficient of thermal expansion.

[5-7. Hot internal pressure creep performance]
Regarding the hot internal pressure creep performance of the fiber reinforced composite pipe 200 at 80 ° C., the circumferential stress is 5.0 MPa for 1000 hours or more, more preferably 5.1 MPa for 1000 hours or more, and further preferably 5.2 MPa for 1000 hours or more. Particularly preferably, the pressure is 5.5 MPa and 1000 hours or longer. The time in the hot internal pressure creep performance is the fracture time. It is preferable that the creep performance at high temperature of the fiber-reinforced composite pipe 200 is higher. When the creep performance at a high temperature of the fiber reinforced composite pipe 200 is high, the applicable range is widened as a pipe through which a high temperature fluid flows. Moreover, it becomes more useful as a cold / hot water pipe by satisfying both linear expansion performance and creep performance. The fracture mode is preferably somewhat brittle, more preferably ductile cracking.

  The hot internal pressure creep performance at 80 ° C. is tested at 80 ° C. using a hot internal pressure creep tester. An example of the hot internal pressure creep tester is a tester manufactured by Condo Science. A method is used in which the multilayer pipe material cut to a length of 50 cm is placed in a constant temperature water bath adjusted to 80 ° C. and a desired circumferential stress is set by applying water pressure using a dedicated sealing plug jig.

[5-8. Molding]
The fiber reinforced composite tube 200 can be formed by co-extrusion by preparing resin compositions for producing the first layer 210, the second layer 220, the third layer 230, the adhesive layer 240, and the gas barrier layer 250, respectively. . It does not specifically limit as a molding machine, A single screw extruder, a biaxial different direction parallel extruder, a biaxial different direction conical extruder, a biaxial same direction extruder, etc. are mentioned. The mold to be shaped, the resin temperature, etc. are not particularly limited.

[6. Metal reinforced composite pipe]
[6-1. Layer structure]
FIG. 4 is a cross-sectional view schematically showing the metal-reinforced composite pipe 300 in FIG.
4 includes a tubular first layer 310 (inner layer / molded body), a tubular second layer 330 (intermediate layer / metal) disposed outside the first layer 310, and a first layer 310. A tubular third layer 350 (outer layer / molded body) disposed outside the two layers 330. A first adhesive layer 320 is interposed between the first layer 310 and the second layer 330, and a second adhesive layer 340 is interposed between the second layer 330 and the third layer 350, but this is not essential. . The first adhesive layer 320 and the second adhesive layer 340 are provided to improve the adhesion between the first layer 310 and the second layer 330 and between the second layer 330 and the third layer 350, respectively. It has been. Therefore, the metal reinforced composite pipe 300 is formed by laminating the first layer 310, the first adhesive layer 320, the second layer 330, the second adhesive layer 340, and the third layer 350 in this order from the axial center side to the outer peripheral side. Yes.

  The first layer 310 includes a polyolefin resin. The second layer 330 is made of metal. The third layer 350 includes a polyolefin resin. The first layer 310 and the third layer 350 do not include glass fibers as in the fiber reinforced composite tube 200. The metal-reinforced composite pipe 300 is excellent in bending workability by including the second layer 330 made of metal as an intermediate layer. Bending workability is a property that is easy to bend and that the shape after bending is difficult to return to the original shape.

  The first layer 310 is the innermost layer of the metal reinforced composite tube 300 and is in contact with cold / hot water transported through the metal reinforced composite tube 300. The metal reinforced composite pipe 300 in this embodiment is a pipe line part constituting a pipe of cold / hot water (in this embodiment, a first layer 310, a first adhesive layer 320, a second layer 330, a second adhesive layer 340). It is preferable that the outer peripheral surface of the multilayer composite pipe formed of the third layer 350 is covered with a heat insulating material 380. The heat insulating material 380 is formed of a structure having a large specific surface area. The heat insulating material 380 blocks the heat transfer between the cold / hot water transported in the metal reinforced composite pipe 300 and the external environment of the metal reinforced composite pipe 300, thereby The metal-reinforced composite pipe 300 is provided from the viewpoint of maintaining the temperature of water and preventing condensation caused by the heat transfer (which may be a factor that significantly reduces heat retention).

  In addition to the first layer 310, the first adhesive layer 320, the second layer 330, the second adhesive layer 340, and the third layer 350, the conduit portion of the metal reinforced composite pipe 300 includes other layers such as the outermost layer. A weather resistant layer may be laminated on the outer layer, and a chemical resistant layer or the like may be laminated on the innermost layer.

[6-2. Thickness]
In the metal reinforced composite pipe 300, the ratio (r2) of the thickness of the second layer 330 to the thickness of the entire metal reinforced composite pipe 300 may be, for example, 0.05 or more and 0.35 or less. The ratio (r2) is preferably 0.1 or more, and preferably 0.2 or less. When the ratio (r2) is equal to or higher than the lower limit, the strength (reinforcing property) is further improved. When the ratio (r2) is not more than the above upper limit, the bending workability is further improved.

In the metal reinforced composite pipe 300, the ratio (r1) of the thickness of the first layer 310 to the total thickness of the metal reinforced composite pipe 300 is preferably 0.35 or more, more preferably 0.45 or more, preferably 0.00. 65 or less, more preferably 0.6 or less. When the ratio (r1) is not less than the above lower limit, the heat resistance, chemical resistance, corrosion resistance, and bending workability are further enhanced. When the ratio (r1) is not more than the above upper limit, the rigidity and strength are further improved.

  In the metal reinforced composite pipe 300, the ratio (r3) of the thickness of the third layer 350 to the thickness of the entire metal reinforced composite pipe 300 is preferably 0.1 or more, more preferably 0.15 or more, preferably 0. 3 or less, more preferably 0.25 or less. When the ratio (r3) is not less than the above lower limit, the heat resistance, chemical resistance, corrosion resistance, and bending workability are further enhanced. When the ratio (r3) is not more than the above upper limit, the rigidity and strength are further improved.

,
The thickness (in this embodiment, the total thickness of the first layer 310, the first adhesive layer 320, the second layer 330, the second adhesive layer 340, and the third layer 350) of the pipe portion of the metal reinforced composite pipe 300 is , Preferably 1 mm or more, more preferably 1.25 mm or more, preferably 6 mm or less, more preferably 3.5 mm or less. When the thickness is not less than the above lower limit, the rigidity, strength, and pressure resistance are further enhanced. When the thickness is less than or equal to the above upper limit, bending workability and lightness are further enhanced.

  In the metal reinforced composite pipe 300, the thickness of each of the first adhesive layer 320 and the second adhesive layer 340 is preferably 50 μm or more, more preferably 75 μm or more, preferably 200 μm or less, more preferably 155 μm or less. When the thickness of each of the first adhesive layer 320 and the second adhesive layer 340 is equal to or more than the above lower limit, the thickness control is further facilitated, and the adhesiveness is further enhanced. When the thickness of each of the first adhesive layer 320 and the second adhesive layer 340 is equal to or less than the above upper limit, the bending workability is further improved, the amount of material used is reduced, the material cost is low, and the weight is reduced.

[6-3. composition]
In the first layer 310, the content of the polyolefin resin is preferably 90% by weight or more, more preferably 95% by weight or more, and preferably 100% by weight (total amount) or less. In the third layer 350, the content of the polyolefin resin is preferably 90% by weight or more, more preferably 95% by weight or more, and preferably 100% by weight (total amount) or less.

[6-4. component]
[6-4-1. Polyolefin resin]
The polyolefin resin used for the first layer 310 and the third layer 350 is not particularly limited, and a known polyolefin resin can be used. As for polyolefin resin, only 1 type may be used and 2 or more types may be used together. The polyolefin resin used for each of the first layer 310 and the third layer 350 may be the same resin or different resins. For example, a resin that is more excellent in terms of heat resistance, durability, and the like can be selected for the first layer 310. The third layer 350 is not particularly limited as long as it has a minimum resistance against external impact and rubbing and stress applied for a long time at the joint of the joint. For example, you may select based on availability, such as cost.
Furthermore, as a polyolefin resin used for each of the first layer 310 and the third layer 350, a polyolefin resin used for the first layer 210, the second layer 220, and / or the third layer 230 of the fiber reinforced composite pipe 200 described above. The same resin as the resin may be used, or a different resin may be used.

Examples of the polyolefin resin include polyethylene, polypropylene, polybutene, ethylene-vinyl acetate copolymer, and ethylene-α-olefin copolymer.
From the viewpoint of heat resistance and durability, polyethylene or polypropylene is preferable, and polyethylene is more preferable. Further, the polyolefin resin may be a crosslinked polyolefin resin (particularly, a crosslinked polyethylene PEX). Examples of the cross-linked polyolefin resin include peroxide cross-linked polyolefin resin (particularly peroxide cross-linked polyethylene PEX-A), silane cross-linked polyolefin resin (particularly silane cross-linked polyethylene PEX-B), and electron beam irradiation cross-linked polyolefin resin (electron). And wire-crosslinked polyethylene PEX-C). From the viewpoint of heat resistance, durability, and bending properties, crosslinked polyethylene (PEX) and heat resistant polyethylene (PE-RT) are particularly preferable.

  Examples of polyethylene (PE) include LDPE, LLDPE, and HDPE. Examples of polypropylene (PP) include homo PP, block PP, and random PP. Examples of polybutene include polybutene-1.

  The ethylene-α-olefin copolymer is about several mol% of α-olefin such as propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene or 1-octene with respect to ethylene. It is particularly preferable that the copolymer be copolymerized at a ratio of

  Moreover, you may select what has long-term creep property as polyolefin resin. As a result, a water leakage accident due to breakage can be prevented. For example, heat-resistant polyethylene (PE-RT) is less likely to generate two points even when used at a high temperature of 90 ° C. for a long time, and is excellent in durability. Alternatively, a polyolefin resin having long-term creep properties conforms to PE100 having a constant stress value of 10.0 MPa or more at which a tube does not break for 50 years at 20 ° C. based on long-term hydraulic strength obtained according to ISO / TR9080. It may be.

[6-4-2. metal]
As a metal which comprises a metal layer, what is excellent in intensity | strength and a drawability can be selected without being specifically limited, For example, aluminum, copper, lead, etc. are mentioned. Aluminum is preferably used.

[6-4-3. Adhesive resin]
Examples of the first adhesive layer 320 and the second adhesive layer 340 include rubber-based hot melt adhesives, modified polyolefins (particularly, modified polyethylene and modified polypropylene), and ionomers. As the adhesive resin, one of the following exemplifications may be used alone, or two or more may be used in combination.

  Examples of the modified polyolefin include acid-modified polyolefin and silane-modified polyolefin. Examples of the modification of the modified polyolefin include modification by grafting and copolymerization. The acid-modified polyolefin is obtained by modifying a polyolefin resin with an unsaturated carboxylic acid or a derivative thereof. Examples of the unsaturated carboxylic acid include acrylic acid, methacrylic acid, maleic acid, nadic acid, fumaric acid, itaconic acid, crotonic acid, citraconic acid, sorbic acid, mesaconic acid, angelic acid, and phthalic acid. Examples of the derivatives include acid anhydrides, esters, amides, imides, metal salts, and the like. For example, maleic anhydride, itaconic anhydride, citraconic anhydride, nadic anhydride, phthalic anhydride, methyl acrylate, Examples include methyl methacrylate, ethyl acrylate, butyl acrylate, maleic acid monoethyl ester, acrylamide, maleic acid monoamide, maleimide, N-butylmaleimide, sodium acrylate, and sodium methacrylate. Among these, unsaturated dicarboxylic acids and derivatives thereof are preferable, and maleic anhydride and phthalic anhydride are particularly preferable.

  An ionomer is a resin obtained by neutralizing a polyolefin copolymer (such as an unsaturated carboxylic acid and an unsaturated carboxylic acid ester as a comonomer) with a metal ion between molecular chains. A copolymer may be used individually or in combination of multiple types. Examples of the metal ion include transition metal ions such as zinc, manganese, and cobalt; alkali metal ions such as lithium, sodium, and potassium; and alkaline earth metal ions such as calcium. These metal ions may be used alone or in combination of two or more.

[6-4-4. Concrete example]
As a more specific layer configuration, for example, when the metal-reinforced composite pipe 300 is configured by a first layer 310, a second layer 330, and a third layer 350, silane-modified PE (crosslinked PE) -aluminum-silane-modified PE. (Crosslinked PE). When the metal reinforced composite pipe 300 is composed of the first layer 310 -the first adhesive layer 320 -the second layer 330 -the second adhesive layer 340 -the third layer 350, PE-RT (heat resistant PE) -malein Acid-modified PE (adhesive layer) -aluminum-maleic acid-modified PE (adhesive layer) -high density PE, silane-modified PE (crosslinked PE) -maleic acid-modified PE (adhesive layer) -aluminum-maleic acid-modified PE (adhesive layer) -Silane modified PE (crosslinked PE).

[6-4-5. Thermal insulation material]
Examples of the structure having a large specific surface area constituting the heat insulating material 380 include a porous material (for example, a resin foam) and a fibrous material (for example, a nonwoven fabric, a woven fabric, a single fiber body, and a net-like body).

The foamed resin may be a polyolefin resin foam described above as the resin used for the first layer 310 and the third layer 350 from the viewpoints of heat insulation, flexibility, dimensional stability, ease of attachment, and the like. From the viewpoint of more effectively obtaining heat insulation, flexibility, dimensional stability, ease of attachment, and the like, a crosslinked product of the above-described polyolefin-based resin (cross-linked polyolefin-based resin) used as the resin used for the first layer 310 and the third layer 350 Resin).
The fibrous material may be an inorganic fiber such as glass fiber or carbon fiber, or an organic fiber such as natural fiber or resin fiber.

[6-4-6. Other ingredients]
The first layer 310, the third layer 350, the first adhesive layer 320, and the second adhesive layer 340 may each include a thermoplastic resin other than the polyolefin-based resin within a range that maintains desired characteristics. However, when the thermoplastic resin other than the polyolefin resin is included, the content of the thermoplastic resin other than the polyolefin resin in the polyolefin resin composition is more than the content of the polyolefin resin in the polyolefin resin composition. Less is preferred. As specific other components, the same components as the thermoplastic resins, antioxidants, crosslinking agents, lubricants, light stabilizers, and pigments other than the polyolefin-based resins mentioned as other components in the fiber reinforced composite pipe 200 described above. Is mentioned.

[6-5. Hot internal pressure creep performance]
The creep strength of the metal reinforced composite tube 300 may be 1.5 times or more and 3 times or less that of the fiber reinforced composite tube 200.

  Preferred embodiments of the present invention are as described above, but the present invention is not limited to them, and various other embodiments are possible without departing from the spirit and scope of the present invention. Furthermore, the operations and effects described in this embodiment are merely examples, and do not limit the present invention.

DESCRIPTION OF SYMBOLS 100 Cold / hot water pipe piping system 200 Fiber reinforced composite pipe 290 Connection member 300 Metal reinforced composite pipe

Claims (5)

A fiber reinforced composite tube containing polyolefin resin and glass fiber; and a metal reinforced composite tube containing polyolefin resin and metal;
A connection member for connecting the fiber-reinforced composite pipe and the metal-reinforced composite pipe,
The fiber-reinforced composite pipe has a linear expansion coefficient of 6 × 10 ⁻⁵ / ° C. or less, and
The total volume of the fiber reinforced composite pipe and the metal reinforced composite pipe is 70% or more of the capacity occupied by the fiber reinforced composite pipe, and
A cold / hot water pipeline system that transports cold / hot water with a temperature range of 20 ° C. or higher.   The cold / hot water pipeline system according to claim 1, wherein the inner diameter of the fiber reinforced composite pipe is 19 mm or more and the inner diameter of the metal reinforced composite pipe is 75 mm or less.   The cold temperature according to claim 1 or 2, wherein the connection member includes an electrofusion joint for connection to the fiber reinforced composite tube and a screw coupling portion for connection to the metal reinforced composite tube. Water pipeline piping system. The fiber-reinforced composite pipe includes at least a tubular first layer, a second layer, and a third layer in this order from the axial center to the outer periphery, and the first layer and the third layer are polyolefin-based resins. As a main component, the second layer contains a polyolefin-based resin and glass fiber, and
The cold / hot water pipeline system according to any one of claims 1 to 3, wherein a ratio of a layer thickness of the second layer to an entire thick wall of the fiber reinforced composite tube is 0.3 or more.   The cold / hot water pipeline system according to any one of claims 1 to 4, wherein an average fiber diameter of the glass fibers is 5 µm or more and 20 µm or less.

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