JP2022049982A - Pipe joint, piping and piping system - Google Patents

Abstract

To provide a pipe joint which can enhance chemical resistance, and also can enhance cutoff performance for a long period of time.SOLUTION: A pipe joint having a receptacle at an end part comprises a pipe joint main body including a first resin, a receptacle member including a second resin, and an adhesion layer. The receptacle member is arranged at an inner surface side of the pipe joint main body at the receptacle, and the adhesion layer is arranged between the pipe joint main body and the receptacle member at the receptacle. The second resin includes a hard vinyl chloride resin, an ABS resin, an acrylic resin, a polycarbonate resin, a polyethylene terephthalate resin or a urethane resin. The adhesion layer includes a polyester resin and a polyolefin resin introduced with a polar group, the adhesion layer has a sea-island structure having a sea part and a land part, and when liquid is made to flow to the receptacle by connecting a connection-objective member to the receptacle, the receptacle member does not contact with the liquid.SELECTED DRAWING: Figure 1

Description

The present invention relates to pipe fittings. The present invention also relates to a pipe and a piping system using the above-mentioned pipe joint.

Patent Document 1 discloses pipe joints used for wastewater equipment, water supply and hot water supply equipment, and the like of buildings. As shown in FIG. 7, the pipe joint 100 described in Patent Document 1 has a joint main body 110 and a composite receiving portion 120 provided at an end portion of the joint main body 110. The composite receiving portion 120 is composed of an inner layer 120a and an outer layer 120b made of different kinds of resin materials. The outer layer 120b of the composite receiving portion 120 is integrated with the joint main body 110. The joint body 110 and the outer layer 120b of the composite receiving portion 120 are formed of polypropylene, polyethylene or the like. The inner layer 120a of the composite receiving portion 120 is formed of vinyl chloride or the like. The end portion of the resin pipe member 200 is inserted inside the composite receiving portion 120. The end portion of the resin pipe member 200 is adhesively connected to the inner layer 120a.

Japanese Unexamined Patent Publication No. 2011-002012

As shown in FIG. 7, when the pipe joint 100 described in Patent Document 1 is used to connect the pipe joint 100 and the resin pipe member 200 to obtain a pipe, the inner layer 120a is formed on the inner peripheral surface of the pipe. There is a region R100 where is exposed. Therefore, in the pipe using the pipe joint 100, the inner layer 120a and the liquid may come into contact with each other when the liquid is passed, and the chemical resistance of the pipe may be lowered. Further, when the chemical resistance is lowered, the inner layer 120a is gradually deteriorated, and as a result, the water stopping property may be lowered.

An object of the present invention is to provide a pipe joint capable of enhancing chemical resistance and enhancing water stopping property for a long period of time. It is also an object of the present invention to provide a pipe and a piping system using the pipe joint.

According to a broad aspect of the present invention, it is a pipe joint having a receiving port at an end, and includes a pipe joint main body containing a first resin, a receiving member containing a second resin, and an adhesive layer. The receiving member is arranged on the inner surface side of the pipe joint body at the receiving port, and the adhesive layer is arranged between the pipe joint main body and the receiving member at the receiving port. The second resin contains a hard vinyl chloride resin, an ABS resin, an acrylic resin, a polycarbonate resin, a polyethylene terephthalate resin, or a urethane resin, and the adhesive layer is introduced with a polyester resin and a polar group. The adhesive layer has a sea-island structure having a sea portion and an island portion, and the receiving member is liquid when the connection target member is connected to the receiving port and the liquid is passed. A pipe joint that does not come into contact with is provided.

In certain aspects of the pipe fitting according to the present invention, the adhesive layer is arranged in a part of the socket between the pipe joint main body and the socket member.

In a particular aspect of the pipe fitting according to the present invention, the first resin is a fluororesin, a polyphenylsulfone resin, a polyphenylene sulfide resin, or an olefin resin.

According to a broad aspect of the present invention, there is provided a pipe comprising the pipe fitting described above and a connection target member connected to the socket of the pipe joint.

In a specific aspect of the piping according to the present invention, the connection target member is a multi-layer pipe having a structure of two or more layers, and the innermost layer of the multi-layer pipe contains the first resin and is of the multi-layer pipe. The outermost layer and the receiving member of the pipe joint are adhesively joined.

According to a broad aspect of the present invention, there is provided a piping system comprising the above-mentioned piping and equipment.

The pipe joint according to the present invention can enhance chemical resistance and can enhance water stoppage for a long period of time.

FIG. 1 is a cross-sectional view schematically showing a pipe joint according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing a pipe joint according to a second embodiment of the present invention. FIG. 3 is a cross-sectional view schematically showing a pipe joint according to a third embodiment of the present invention. FIG. 4 is a cross-sectional view schematically showing a pipe joint according to a fourth embodiment of the present invention. FIG. 5 is a cross-sectional view schematically showing a pipe according to an embodiment of the present invention. FIG. 6 is a schematic perspective view showing a piping system according to an embodiment of the present invention. FIG. 7 is a cross-sectional view schematically showing a pipe using a conventional pipe joint.

Hereinafter, the present invention will be clarified by explaining specific embodiments of the present invention with reference to the drawings. In the drawings below, the size, thickness, shape, etc. may differ from the actual size, thickness, shape, etc. for convenience of illustration.

FIG. 1 is a cross-sectional view schematically showing a pipe joint according to the first embodiment of the present invention. FIG. 1 shows a structure in the vicinity of a receiving port of a pipe joint.

The pipe joint 10 shown in FIG. 1 is provided with a receiving port at an end portion. A connection target member such as a resin pipe is connected to the receiving port. The pipe joint 10 includes a pipe joint main body 1, a receiving member 2, and an adhesive layer 3. The pipe joint main body 1 contains a first resin. The receiving member 2 contains a second resin. The first resin and the second resin are different resins. The adhesive layer 3 contains a polyester-based resin and a polyolefin-based resin into which a polar group has been introduced. The adhesive layer 3 has a sea-island structure having a sea part and an island part.

The receiving member 2 has a cylindrical shape.

The receiving port member 2 is arranged on the inner surface 1a side of the pipe joint main body 1 in the receiving port. The adhesive layer 3 is arranged between the pipe joint main body 1 and the receiving member 2 at the receiving port. The adhesive layer 3 adheres the pipe joint main body 1 and the receiving member 2. The pipe joint main body 1 and the receiving member 2 are adhered to each other via the adhesive layer 3. The adhesive layer 3 is arranged on the inner surface 1a of the pipe joint main body 1 at the receiving port. The adhesive layer 3 is arranged on the entire inner surface 1a of the pipe joint main body 1 at the receiving port. The adhesive layer 3 is arranged on the outer surface of the receiving member 2 in the receiving port. The adhesive layer 3 is arranged on the entire outer surface of the receiving member 2 at the receiving port. In the pipe joint 10, one adhesive layer 3 is present in one socket.

Let L be the length of the socket of the pipe joint 10. The length of the adhesive layer 3 is L. The length direction of the adhesive layer 3 corresponds to the axial direction of the pipe joint 10.

As shown in FIG. 5 described later, the receiving member 2 does not come into contact with the liquid when the connecting target member is connected to the receiving port and the liquid is passed therethrough. When the connection target member is connected to the receiving port, the inner surface of the receiving port member 2 is covered by the connection target member. When the connection target member is connected to the receiving port, the inner surface of the receiving port member 2 does not have an exposed portion.

Therefore, in the pipe joint according to the present invention, the chemical resistance can be improved and the water stopping property can be improved for a long period of time.

As shown in FIG. 7, in the pipe joint 100 described in Patent Document 1, the inner layer 120a and the liquid come into contact with each other when the liquid is passed, so that the pipe joint 100 is used as a pipe joint for a pipe that requires chemical resistance. Moreover, it is difficult to use it as a pipe joint of a pipe used for flowing a high-temperature liquid.

On the other hand, in the pipe joint of the present invention, the receiving member does not come into contact with the liquid when the liquid is passed, so that the chemical resistance can be improved. Further, since the pipe joint of the present invention has a specific adhesive layer, the joint body and the receiving member can be firmly adhered to each other, and the water stopping property can be effectively enhanced.

FIG. 2 is a cross-sectional view schematically showing a pipe joint according to a second embodiment of the present invention. FIG. 2 shows a structure in the vicinity of a receiving port of a pipe joint.

The pipe joint 10A shown in FIG. 2 is provided with a receiving port at an end portion. A connection target member such as a resin pipe is connected to the receiving port. The pipe joint 10A includes a pipe joint main body 1A, a receiving member 2A, and an adhesive layer 3A. The shape of the receiving member and the position where the adhesive layer is arranged are different between the pipe joint 10 shown in FIG. 1 and the pipe joint 10A shown in FIG.

The receiving member 2A has one recess on the outer surface. Specifically, the receiving member 2A has one annular recess on the outer surface. The receiving member 2A has a cylindrical shape having one annular recess on the outer surface.

The receiving port member 2A is arranged on the inner surface 1Aa side of the pipe joint main body 1A in the receiving port. The adhesive layer 3A is arranged between the pipe joint main body 1A and the receiving member 2A at the receiving port. The adhesive layer 3A is arranged in a part of the receiving port between the pipe joint main body 1A and the receiving member 2A. The adhesive layer 3A adheres the pipe joint main body 1A and the receiving member 2A. The pipe joint main body 1A and the receiving member 2A are adhered to each other via the adhesive layer 3A. The adhesive layer 3A is arranged on a part of the inner surface 1Aa of the pipe joint main body 1A at the receiving port. The adhesive layer 3A is arranged on a part of the outer surface of the receiving member 2A at the receiving port. The adhesive layer 3A is arranged inside the annular recess of the receiving member 2A. In the pipe joint 10A, one adhesive layer 3A is present in one socket.

Let L be the length of the socket of the pipe joint 10A. The length of the adhesive layer 3A is smaller than L and smaller than 1/2 × L. The length of the adhesive layer 3A is larger than 1/10 × L. The length direction of the adhesive layer 3A corresponds to the axial direction of the pipe joint 10A.

In the pipe joint 10A, a portion where the adhesive layer 3A does not exist, a portion where the adhesive layer 3A exists, and a portion where the adhesive layer 3A does not exist are formed from the open end of the receiving port toward the inside of the pipe joint 10A in the axial direction. Have in order.

FIG. 3 is a cross-sectional view schematically showing a pipe joint according to a third embodiment of the present invention. FIG. 3 shows a structure in the vicinity of a receiving port of a pipe joint.

The pipe joint 10B shown in FIG. 3 is provided with a receiving port at an end portion. A connection target member such as a resin pipe is connected to the receiving port. The pipe joint 10B includes a pipe joint main body 1B, a receiving member 2B, and an adhesive layer 3B. The shape of the receiving member and the position where the adhesive layer is arranged are different between the pipe joint 10 shown in FIG. 1 and the pipe joint 10B shown in FIG.

The receiving member 2B has two recesses on the outer surface. Specifically, the receiving member 2B has two annular recesses on the outer surface. The receiving member 2B has a cylindrical shape having two annular recesses on the outer surface. The plurality of annular recesses are separated by a distance.

The receiving port member 2B is arranged on the inner surface 1Ba side of the pipe joint main body 1B at the receiving port. The adhesive layer 3B is arranged between the pipe joint main body 1B and the receiving member 2B at the receiving port. The adhesive layer 3B is arranged in a part of the receiving port between the pipe joint main body 1B and the receiving member 2B. The adhesive layer 3B adheres the pipe joint main body 1B and the receiving member 2B. The pipe joint main body 1B and the receiving member 2B are adhered to each other via the adhesive layer 3B. The adhesive layer 3B is arranged on a part of the inner surface 1Ba of the pipe joint main body 1B at the receiving port. The adhesive layer 3B is arranged on a part of the outer surface of the receiving member 2B at the receiving port. The adhesive layer 3B is arranged inside each of the two annular recesses of the receiving member 2B. In the pipe joint 10B, there are two adhesive layers 3B in one socket.

Let L be the length of the socket of the pipe joint 10B. The length of one adhesive layer 3B is smaller than L and smaller than 1/2 × L. The length of one adhesive layer 3B is larger than 1/10 × L. The length direction of the adhesive layer 3B corresponds to the axial direction of the pipe joint 10B.

In the pipe joint 10B, the portion where the adhesive layer 3B does not exist, the portion where the adhesive layer 3B exists, and the portion where the adhesive layer 3B does not exist are bonded from the open end of the receiving port toward the inside in the axial direction of the pipe joint 10B. It has a portion in which the layer 3B is present and a portion in which the adhesive layer 3B is not present, in this order.

FIG. 4 is a cross-sectional view schematically showing a pipe joint according to a fourth embodiment of the present invention. FIG. 4 shows a structure in the vicinity of a receiving port of a pipe joint.

The pipe joint 10C shown in FIG. 4 is provided with a receiving port at an end portion. A connection target member such as a resin pipe is connected to the receiving port. The pipe joint 10C includes a pipe joint main body 1C, a receiving member 2C, and an adhesive layer 3C. The shape of the receiving member and the position where the adhesive layer is arranged are different between the pipe joint 10 shown in FIG. 1 and the pipe joint 10C shown in FIG.

The receiving member 2C has three recesses on the outer surface. Specifically, the receiving member 2C has three annular recesses on the outer surface. The receiving member 2C has a cylindrical shape having three annular recesses on the outer surface. The plurality of annular recesses are separated by a distance.

The receiving port member 2C is arranged on the inner surface 1Ca side of the pipe joint main body 1C in the receiving port. The adhesive layer 3C is arranged between the pipe joint main body 1C and the receiving member 2C at the receiving port. The adhesive layer 3C is arranged in a part of the receiving port between the pipe joint main body 1C and the receiving member 2C. The adhesive layer 3C adheres the pipe joint main body 1C and the receiving member 2C. The pipe joint main body 1C and the receiving member 2C are adhered to each other via the adhesive layer 3C. The adhesive layer 3C is arranged on a part of the inner surface 1Ca of the pipe joint main body 1C at the receiving port. The adhesive layer 3C is arranged on a part of the outer surface of the receiving member 2C at the receiving port. The adhesive layer 3C is arranged inside each of the three annular recesses of the receiving member 2C. In the pipe joint 10C, there are three adhesive layers 3C in one socket.

Let L be the length of the socket of the pipe joint 10C. The length of one adhesive layer 3C is smaller than L and smaller than 1/2 × L. The length of one adhesive layer 3C is larger than 1/10 × L. The length direction of the adhesive layer 3C corresponds to the axial direction of the pipe joint 10C.

In the pipe joint 10C, the portion where the adhesive layer 3C does not exist, the portion where the adhesive layer 3C exists, and the portion where the adhesive layer 3C does not exist are bonded from the open end of the socket toward the inside in the axial direction of the pipe joint 10C. It has a portion where the layer 3C exists, a portion where the adhesive layer 3C does not exist, a portion where the adhesive layer 3C exists, and a portion where the adhesive layer 3C does not exist, in this order.

Hereinafter, the details of the pipe joint will be further described.

(Main body of pipe fitting)
The pipe joint body contains the first resin. The first resin is a resin different from the second resin contained in the receiving member. As the first resin, only one kind may be used, or two or more kinds may be used in combination.

Examples of the first resin include a fluororesin, a polyphenylsulfone resin (PPSU), a polyphenylene sulfide resin (PPS), and an olefin resin.

Examples of the fluorine-based resin include poly (tetrafluoroethylene) homopolymer (PTFE) and polyvinylidene fluoride (PVDF).

Examples of the olefin resin include polyethylene, polypropylene, polybutene, ethylene-vinyl acetate copolymer, ethylene-α-olefin copolymer and the like.

From the viewpoint of enhancing chemical resistance, the first resin is preferably a fluorine-based resin, a polyphenylsulfone resin, a polyphenylene sulfide resin, or an olefin-based resin. In this case, it can be suitably used for general drainage or kitchen drainage. When the fluororesin is PTFE or PVDF, it can be suitably used for plant applications. Further, when the olefin resin is a high molecular weight high density polyethylene, the smoothness can be improved. Further, when the olefin-based resin is a high-molecular-weight high-density polyethylene, the roughness of the inner surface can be reduced, so that the flowability of wastewater is improved, and the growth of bacteria and the solidification of oil on the inner surface are achieved. It is possible to effectively suppress the retention due to. Therefore, when the olefin resin is a high molecular weight high-density polyethylene, it can be suitably used for drainage from precision equipment or drainage from medical equipment.

The content of the first resin in 100% by weight of the pipe joint body is preferably 90% by weight or more, more preferably 95% by weight or more, still more preferably 98% by weight or more.

(Receptacle member)
The receiving port member is a member arranged on the inner surface side of the pipe fitting main body at the receiving port of the pipe fitting. The receiving member does not come into contact with the liquid when the connecting target member is connected to the receiving port and the liquid is passed therethrough.

The receiving member contains a second resin. From the viewpoint of increasing the mechanical strength and the adhesiveness between the pipe joint body and the outer layer of the pipe, the second resin is a hard vinyl chloride resin, an ABS (acrylonitrile-butadiene-styrene) resin, and an acrylic resin. , Polycarbonate resin, polyethylene terephthalate resin, or urethane resin. As the second resin, only one kind may be used, or two or more kinds may be used in combination.

From the viewpoint of further enhancing the mechanical strength and further enhancing the adhesiveness between the pipe joint body and the outer layer of the pipe, the second resin is a rigid vinyl chloride resin, ABS (acrylonitrile-butadiene-styrene). It is preferably a resin, an acrylic resin, a polycarbonate resin, a polyethylene terephthalate resin, or a urethane resin.

Examples of the rigid vinyl chloride resin include (1) a homopolymer of a vinyl chloride monomer, (2) a copolymer of a vinyl chloride monomer and a monomer having an unsaturated bond commutable with the vinyl chloride monomer, and (3). Examples thereof include polymers other than vinyl chloride and graft polymers in which vinyl chloride is graft-polymerized on a copolymer.

The monomer having an unsaturated bond copolymerizable with the vinyl chloride monomer is not particularly limited, and is an α-olefin compound such as ethylene, propylene or butylene; a compound having a vinyl group such as allyl chloride or acrylonitrile; vinyl acetate or propion. Vinyl ester compounds such as vinyl acid acid; Vinyl ether compounds such as butyl vinyl ether and cetyl vinyl ether; (meth) acrylic acid ester compounds such as methyl (meth) acrylate, ethyl (meth) acrylate and butyl (meth) acrylate; styrene, α-methyl Examples thereof include aromatic vinyl compounds such as styrene; dicarboxylic acid compounds such as maleic anhydride; and N-substituted maleimide compounds such as N-phenylmaleimide and N-cyclohexylmaleimide. As the monomer having an unsaturated bond copolymerizable with the vinyl chloride monomer, only one kind may be used, or two or more kinds may be used in combination.

The above-mentioned copolymer may be a random copolymer or a block copolymer.

The polymer and copolymer for graft-copolymerizing vinyl chloride are not particularly limited, and are an ethylene-vinyl acetate copolymer, an ethylene-vinyl acetate-carbon monoxide copolymer, an ethylene-ethyl acrylate copolymer, and ethylene. -Butyl acrylate-Carbon monoxide copolymer, acrylonitrile-butadiene copolymer, polyurethane, chlorinated polyethylene, chlorinated polypropylene and the like can be mentioned. As the polymer and the copolymer for graft-copolymerizing the vinyl chloride, only one kind may be used, or two or more kinds may be used in combination.

The content of the structural unit derived from vinyl chloride in 100% by weight of the vinyl chloride resin is preferably 40% by weight or more.

The average degree of polymerization of the rigid vinyl chloride resin is preferably 400 or more, preferably 3000 or less. When the average degree of polymerization of the rigid vinyl chloride resin is at least the above lower limit, long-term performance such as thermal stability and fatigue characteristics is not likely to be impaired. When the average degree of polymerization of the rigid vinyl chloride resin is not more than the above upper limit, it is not necessary to keep the temperature under high temperature at the time of molding, and the processability is further improved.

The rigid vinyl chloride resin is preferably a chlorinated vinyl chloride resin.

The receiving member may contain components other than the second resin. Other components include heat stabilizers such as alkyl tin mercapto compounds and alkyl tin malate; plasticizers such as di-2-ethylhexyl phthalate (DOP) and -2-ethylhexyl adipate (DOA); polyethylene wax. , Ester-based waxes, stearic acid, montanic acid-based waxes, and lubricants such as calcium stearate; acrylic impact-resistant enhancers, and chlorinated polyethylene-based impact-resistant enhancers and other impact-resistant enhancers; pigments; Inhibitors; flame retardants; inorganic fillers such as calcium carbonate, talc, clay, and mica; processing aids such as methacrylic acid ester resins.

As shown in FIG. 1, the shape of the receiving member may be a cylindrical shape. As shown in FIGS. 2 to 4, the shape of the receiving member may be a shape having a recess on the outer surface or a shape having an annular recess on the outer surface. The shape of the receiving member may be a shape other than these.

The receiving member may have a plurality of recesses or a plurality of annular recesses in a direction corresponding to the axial direction of the pipe joint. When the receiving member has a recess or an annular recess on the outer surface, the number of the recess or the annular recess may be one, one or more, or two. Well, it may be two or more, three or more, three or more, or four or more.

The average thickness of the receiving member is preferably 0.5 mm or more, more preferably 0.8 mm or more, preferably 2.5 mm or less, and more preferably 1 mm or less.

(Adhesive layer)
The adhesive layer is a layer arranged between the pipe joint main body and the receiving member in the receiving port. With the adhesive layer, the pipe joint main body and the receiving member are firmly adhered to each other, and the water stopping property can be enhanced for a long period of time.

The adhesive layer has a sea-island structure having a sea portion (first region) and an island portion (second region). The adhesive layer has a phase-separated structure. The presence or absence of the sea-island structure of the adhesive layer can be confirmed by, for example, a scanning electron microscope (SEM).

The adhesive layer contains a polyester-based resin and a polyolefin-based resin into which a polar group has been introduced. Further, by using both of these resins, an adhesive layer having a sea-island structure can be satisfactorily obtained. As the polyester-based resin and the polyolefin-based resin into which the polar group is introduced, only one kind may be used, or two or more kinds thereof may be used in combination.

Examples of the polyester-based resin include polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate.

Examples of the polyolefin-based resin in the polyolefin-based resin into which the polar group is introduced include polyethylene, polypropylene, and polybutene.

Examples of the polar group in the polyolefin-based resin into which the polar group has been introduced include a hydroxyl group, a carboxyl group, and an amino group. The polar group is preferably introduced into the main chain of the polyolefin resin.

In the adhesive layer, the sea portion may contain a relatively large amount of polyester resin, and the island portion may contain a relatively large amount of a polyolefin resin into which a polar group has been introduced. In the adhesive layer, the sea portion may contain a relatively large amount of a polyolefin-based resin into which a polar group has been introduced, and the island portion may contain a relatively large amount of a polyester-based resin.

The total content of the polyester resin and the polyolefin resin into which the polar group is introduced is preferably 80% by weight or more, more preferably 90% by weight or more in 100% by weight of the adhesive layer. When the total content is at least the above lower limit, the adhesive force between the pipe joint main body and the receiving member can be further enhanced, and the water stopping property can be further enhanced for a longer period of time.

The melting temperature of the adhesive layer is preferably 95 ° C. or higher, more preferably 100 ° C. or higher, still more preferably 130 ° C. or higher, particularly preferably 150 ° C. or higher, and most preferably 160 ° C. or higher. When the melting temperature is at least the above lower limit, the adhesive force between the pipe joint main body and the receiving member can be further increased, and the pipe joint of the present invention is suitable for use in passing a high-temperature liquid. Can be used for. The melting temperature of the adhesive layer may be 200 ° C. or lower, or 180 ° C. or lower.

The melting temperature is measured by DSC (Differential Scanning Calorimetry) in accordance with the C method of JIS K6824 under the condition that the temperature is raised at 10 ° C./min.

The length, thickness and number of the adhesive layers arranged are not particularly limited.

The average thickness of the adhesive layer is preferably 0.1 mm or more, more preferably 0.5 mm or more, particularly preferably 2.5 mm or less, and more preferably 1.0 mm or less. When the average thickness of the adhesive layer is not less than the lower limit and not more than the upper limit, the adhesive force between the pipe joint main body and the receiving member can be further enhanced, and the water stopping property can be further enhanced for a longer period of time. Can be done.

Let L be the length of the socket of the pipe joint. In the socket, the total length of the adhesive layers is preferably 1/10 × L or more, more preferably 1/5 × L or more, still more preferably 1/3 × L or more, still more preferably 1 /. It is 2 × L or more, particularly preferably 2/3 × L or more, and most preferably L. When the total length of the adhesive layers is not more than the lower limit, the adhesive force between the pipe joint main body and the receiving member can be further enhanced, and the water stopping property can be further enhanced for a longer period of time. .. However, in the socket, the total length of the adhesive layers may be 1/5 × L or less, 1/10 × L or less, or 1/15 × L or less. May be good. The total length of the adhesive layers is the total length of the adhesive layers when a plurality of adhesive layers are present in one socket. The length of the adhesive layer is the length of the adhesive layer when one adhesive layer is present in one socket. The length direction of the adhesive layer corresponds to the axial direction of the pipe joint.

(Other details of pipe fittings)
The pipe joint can be manufactured, for example, by the method (1) or (2) below.

(1) A receiving member is obtained by injection molding. The obtained receiving member is set in a mold, and the material of the adhesive layer is injected into the mold to obtain a receiving member on which the adhesive layer is formed. The obtained receiving member with an adhesive layer is set in a mold, and the material of the pipe joint body is injected into the mold to inject and mold the pipe joint body. In this way, a pipe joint is obtained by insert molding.

(2) The material of the pipe joint body, the material of the socket member, and the material of the adhesive layer are separately set in one type of mold, and the pipe joint body and the socket member are used by using multiple injection nozzles capable of injection. And the adhesive layer are injection molded at the same time. In this way, pipe fittings are obtained by multicolor molding.

In the method (1) or (2) above, the pipe joint body and the receiving member are bonded by the adhesive layer.

The shape of the pipe joint is not particularly limited. A conventionally known shape can be adopted as the shape of the pipe joint. The pipe joint may be an LT type pipe joint, an L-shaped or straight type pipe joint described in JIS K6739 or the like, and a pipe joint having a shape described in JIS K6743 or the like. You may. Further, even if the above-mentioned pipe fitting has a metal receiving port in which a part of the receiving port is made of metal and can be connected to a steel pipe (metal valve socket: one adhesive part). Often, it may be a pipe joint such as a plug-in socket and an exchange socket that can be connected by a rubber ring, or it may be a pipe joint in which some of the sockets are not adhesive sockets.

(Plumbing)
The pipe according to the present invention includes the pipe joint described above and a member to be connected connected to the socket of the pipe joint.

FIG. 5 is a cross-sectional view schematically showing a pipe according to an embodiment of the present invention. In FIG. 5, the pipe fitting 10 shown in FIG. 1 is used.

The pipe 90 includes a pipe joint 10 and a member to be connected 8. The connection target member 8 is a multi-layer pipe having a two-layer structure including an inner layer 81 and an outer layer 82. The inner layer 81 is the innermost layer and is a surface layer. The outer layer 82 is the outermost layer and is a surface layer. The outer layer 82 of the connection target member 8 and the receiving member 2 of the pipe joint 10 are adhered to each other via the adhesive layer 7. The outer layer 82 of the connection target member 8 and the receiving member 2 of the pipe joint 10 are adhesively joined. When the liquid is passed through the pipe 90, the receiving member 2 does not come into contact with the liquid.

Examples of the connection target member include a resin pipe and the like. The resin tube may be a single-layer tube having a structure of only one layer, or may be a multi-layer tube having a structure of two or more layers.

From the viewpoint of enhancing the adhesive strength between the connection target member and the pipe joint and enhancing the chemical resistance, the connection target member is preferably a resin pipe, and more preferably a multi-layer pipe having a structure of two or more layers. preferable. The multilayer tube may be a multilayer tube having a structure of three or more layers.

The multilayer tube may be, for example, a multilayer tube having a three-layer structure including an innermost layer, an adhesive layer, and an outermost layer. In this case, the adhesive force between the innermost layer and the outermost layer can be enhanced, so that the workability can be enhanced. The adhesive layer is preferably a layer having durability against external forces generated by cutting and thermal expansion and contraction during construction.

The resin contained in the outermost layer of the multilayer tube is not particularly limited. The resin contained in the outermost layer of the multilayer tube is preferably a resin that can be adhered to the receiving member. In the pipe, it is preferable that the outermost layer of the multi-layer pipe and the receiving member of the pipe joint are adhesively joined.

Examples of the resin contained in the outermost layer of the multilayer tube include vinyl chloride resin, nylon resin, epoxy resin, ABS resin and the like. Only one type of the above resin may be used, or two or more types may be used in combination.

The vinyl chloride resin may be a chlorinated vinyl chloride resin.

The chlorine content of the chlorinated vinyl chloride resin is preferably 60% by weight or more, preferably 71% by weight or less. When the chlorine content is at least the above lower limit, the heat resistance can be enhanced. When the chlorine content is not more than the upper limit, the moldability can be improved.

The chlorine content is determined by neutralization titration by an oxygen flask combustion method in accordance with JIS K7229.

The average degree of polymerization of the chlorinated vinyl chloride resin is 600 or more and 1400 or less.

Further, the outermost layer of the multilayer tube may contain other components described in the section of the receiving member.

The innermost layer of the multilayer tube preferably contains the first resin. The innermost layer of the multilayer pipe preferably contains the same resin (first resin) as the pipe joint main body.

The thickness of the multilayer tube is not particularly specified, but is preferably 1 mm or more from the viewpoint of moldability. By making the layer ratio of the multilayer pipe in the thickness direction predominantly vinyl chloride resin, it is possible to obtain the same handleability and workability as general-purpose vinyl chloride pipe.

(Piping system)
The piping system according to the present invention includes the above-mentioned piping and equipment.

FIG. 6 is a schematic perspective view showing a piping system according to an embodiment of the present invention.

The piping system S includes equipment M, pipe joints T1 to T4, resin pipes H1 to H4, and a drainage groove D.

In the piping system S, the device M is an autoclave. In the piping system S, the steam drainage generated by the device M installed on the ground can be drained to the drainage ditch D arranged in the ground.

The pipe fitting T1 includes a pipe fitting main body which is a valve socket. One end T1a of the pipe joint T1 is a metal receiving port, and the steel pipe K connected to the device M is connected to the one end T1a. One end of the resin pipe H1 is inserted into the other end T1b of the pipe joint T1.

The pipe joint T2 has an L-shaped shape. The other end of the resin pipe H1 is inserted into one end T2a of the pipe joint T2. One end of the resin pipe H2 is inserted into the other end T2b of the pipe joint T2.

The other end of the resin pipe H2 is inserted into one end T3a of the pipe joint T3. One end of the resin pipe H3 is inserted into the other end T3b of the pipe joint T3.

The pipe joint T4 has an L-shaped shape. The other end of the resin pipe H3 is inserted into one end T4a of the pipe joint T4. One end of the resin pipe H4 is inserted into the other end T4b of the pipe joint T4.

The other end of the resin pipe H4 is connected to the drainage ditch D.

Hereinafter, the present invention will be described in more detail with reference to examples. The present invention is not limited to the following examples.

(Example 1)
Polypropylene resin (“E203GP” manufactured by Prime Polymer Co., Ltd.) was prepared as the material of the pipe joint body.

A rigid vinyl chloride resin (manufactured by Sekisui Chemical Co., Ltd.) was prepared as a material for the receiving member.

As a material for the adhesive layer, a material containing a polyester-based resin and a polyolefin-based resin into which a polar group was introduced (“Modic” manufactured by Mitsubishi Chemical Corporation) was prepared.

Fabrication of pipe fittings:
The material of the receiving member was molded by injection molding to prepare a receiving member (see FIG. 2) having one annular recess on the outer surface. The obtained receiving member was set in a mold, and the material of the adhesive layer was injected into the mold to prepare a receiving member on which the adhesive layer was formed. The obtained receiving member with an adhesive layer was set in the receiving core portion of the mold, and the material of the pipe joint main body was injected into the mold to inject and mold the pipe joint main body. In this way, a pipe joint (diameter 40A at the end of the socket) having the shape shown in FIG. 2 was produced. The thickness and length of the adhesive layer in the obtained pipe joint are shown in Table 1 below. Since the number of adhesive layers existing in one socket is one in the obtained pipe joint, the length per adhesive layer is the same as the total length of the adhesive layers.

Piping production:
A pipe was manufactured by adhesively joining a resin pipe (single-layer pipe, length of about 10 cm to 15 cm) to the receiving port of the obtained pipe joint.

(Example 2)
A pipe joint and a pipe were produced in the same manner as in Example 1 except that the length of the annular recess in the receiving member was changed and the length of the adhesive layer was changed.

(Comparative Example 1)
The pipe joint and the pipe were produced in the same manner as in Example 1 except that the adhesive layer was not formed and the shape of the pipe joint had the shape shown in FIG. 7.

(evaluation)
(1) Water pressure resistance test A water stop test jig was attached to the end of the obtained pipe. With the inside of the pipe filled with water, a water pressure of 0.35 MPa was applied for 2 minutes in an environment of 23 ° C.

[Criteria for water pressure resistance test]
○: No leakage occurs ×: Leakage occurs

(2) Chemical resistance A water stop test jig was attached to the end of the obtained pipe. It was confirmed whether or not the liquid came into contact with the receiving member when the liquid was passed while the inside of the pipe was filled with water.

[Criteria for chemical resistance]
◯: The liquid does not come into contact with the receiving member ×: The liquid comes into contact with the receiving member

Table 1 shows the configurations and results of pipe fittings.

1,1A, 1B, 1C ... Pipe fitting body 1a, 1Aa, 1Ba, 1Ca ... Inner surface 2,2A, 2B, 2C ... Receptacle member 3,3A, 3B, 3C ... Adhesive layer 7 ... Adhesive layer 8 ... Connection target Members 10, 10A, 10B, 10C ... Pipe fitting 81 ... Inner layer 82 ... Outer layer 90 ... Piping D ... Drainage groove H1, H2, H3, H4 ... Resin pipe K ... Steel pipe M ... Equipment S ... Piping system T1, T2, T3 T4 ... Pipe fitting T1a, T2a, T3a, T4a ... One end T1b, T2b, T3b, T4b ... The other end

Claims (6)

A pipe fitting that has a receiving port at the end.
A pipe joint body containing the first resin, a receiving member containing the second resin, and an adhesive layer are provided.
The receiving member is arranged on the inner surface side of the pipe joint main body in the receiving port.
The adhesive layer is arranged between the pipe joint main body and the receiving member in the receiving port.
The second resin contains a hard vinyl chloride resin, an ABS resin, an acrylic resin, a polycarbonate resin, a polyethylene terephthalate resin, or a urethane resin.
The adhesive layer contains a polyester-based resin and a polyolefin-based resin into which a polar group has been introduced.
The adhesive layer has a sea-island structure having a sea part and an island part, and has an island structure.
The receiving member is a pipe joint that does not come into contact with the liquid when the connecting target member is connected to the receiving port and the liquid is passed therethrough. The pipe joint according to claim 1, wherein the adhesive layer is arranged in a part of the socket between the pipe joint main body and the socket member. The pipe joint according to claim 1 or 2, wherein the first resin is a fluororesin, a polyphenylsulfone resin, a polyphenylene sulfide resin, or an olefin resin. The pipe fitting according to any one of claims 1 to 3 and
A pipe provided with a connection target member connected to the socket of the pipe joint. The connection target member is a multi-layer pipe having a structure of two or more layers.
The innermost layer of the multilayer tube contains the first resin and contains the first resin.
The pipe according to claim 4, wherein the outermost layer of the multi-layer pipe and the receiving member of the pipe joint are adhesively joined. With the piping according to claim 4 or 5.
A plumbing system equipped with equipment.

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