JP2018003877A - Pipe and pipe connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe capable of enhancing connection strength and being used under pressure.SOLUTION: A pipe of this invention is a pipe to an end part of which a member to be connected is connected, and includes a tubular pipe body, a coating layer and an adhesion layer. The coating layer is arranged on an external surface of the pipe body so as not to reach a terminal of the pipe. The adhesion layer is arranged on the external surface of the pipe body at the end part of the pipe. Solvent resistance of the pipe body is higher than solvent resistance of the coating layer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe including a tubular pipe body, a coating layer, and an adhesive layer. Moreover, this invention relates to the piping connection body using the said piping.

  Buildings such as condominiums, apartments, and detached houses often use plastic piping for water supply and drainage. In addition, when the pipe is used outdoors or when it is necessary to prevent the permeation of oxygen in the pipe, a pipe in which the inner layer and the outer layer formed of a highly functional resin composition are integrated is used. ing. For example, in the “color pipe” manufactured by Sekisui Chemical Co., Ltd., the inner layer is a vinyl chloride resin (PVC resin), and the outer layer is a resin having excellent weather resistance, so that it can be used outdoors.

  In addition, when the required length of the piping structure is longer than the length of one pipe, or when the piping structure is bent or the like, a plurality of pipes are connected directly or via joints. In this case, an adhesive layer may be formed at the end of the pipe, and the pipe may be connected by the adhesive layer.

  Patent Document 1 below discloses a vinyl chloride resin pipe whose outer periphery is covered with an outer layer. The pipe body is formed of a mixed resin composition of chlorinated vinyl chloride resin and vinyl chloride resin. The outer layer is formed of an acrylic-vinyl chloride copolymer resin composition obtained by graft-polymerizing a vinyl chloride monomer to an acrylic copolymer, and the thickness of the outer layer is 20 to 200 μm.

JP 2002-254576 A

  In a conventional pipe as described in Patent Document 1, pipes are connected via an adhesive layer disposed on the outer surface of the outer layer covering the pipe body, and the outer layer and the adhesive layer are connected to each other. Adhesiveness may be poor and sufficient connection strength may not be obtained. As a result, when the internal pressure increases due to water flow or the like, the connected pipe may be disconnected.

  An object of the present invention is to provide a pipe that can increase the connection strength and can be used even under pressure. Moreover, the objective of this invention is providing the piping connection body using the said piping.

  According to a wide aspect of the present invention, a pipe that is used with a connection target member connected to an end thereof, and includes a tubular pipe body, a coating layer, and an adhesive layer, and the coating layer is an end of the pipe. The adhesive layer is disposed on the outer surface of the pipe body at the end of the pipe, and the solvent resistance of the pipe body Provides a pipe that is higher than the solvent resistance of the coating layer.

  In a specific aspect of the pipe according to the present invention, the ratio of the total thickness of the pipe main body and the coating layer to the outer diameter of the pipe is 0.04 or more and 0.2 or less, About the part located on the outer surface of the said piping main body, the length in the axial direction of piping of this part is 5 mm or more and 200 mm or less, and the total thickness of the said piping main body and the said contact bonding layer is the said piping main body. The absolute value of the difference between the total thickness of the pipe body and the adhesive layer and the total thickness of the pipe body and the coating layer is 10 μm or more. , 1000 μm or less.

  On the specific situation with piping which concerns on this invention, arithmetic mean roughness Ra of the outer surface of the said piping main body in the edge part of piping is 0.05 micrometer or more and 3000 micrometers or less.

  On the specific situation with piping which concerns on this invention, the said contact bonding layer contains the solvent which can swell or melt | dissolve the outer surface of the said piping main body.

  On the specific situation with piping which concerns on this invention, the said contact bonding layer contains the solvent which can swell or melt | dissolve the outer surface of the said coating layer.

  On the specific situation with piping which concerns on this invention, the said contact bonding layer is arrange | positioned on the outer surface of the said piping main body so that the terminal of piping may be reached.

  On the specific situation with the piping which concerns on this invention, the said contact bonding layer is arrange | positioned also on the outer surface of the said coating layer.

  According to a wide aspect of the present invention, there is provided a pipe connection body including the pipe described above and a connection target member connected to an end of the pipe.

  On the specific situation with the piping connection body which concerns on this invention, the said contact bonding layer in the said piping is exposed from the said piping side terminal of the said connection object member.

  In a specific aspect of the pipe connection body according to the present invention, with respect to a portion of the adhesive layer that is exposed from the pipe-side end of the connection target member of the adhesive layer, the length of the portion in the axial direction of the pipe. However, it is 50 mm or less.

  A pipe according to the present invention is a pipe used with a connection target member connected to an end thereof, and includes a tubular pipe body, a coating layer, and an adhesive layer, and the coating layer reaches the end of the pipe. Is disposed on the outer surface of the pipe body, the adhesive layer is disposed on the outer surface of the pipe body at the end of the pipe, and the solvent resistance of the pipe body is Since it is higher than the solvent resistance of the coating layer, the connection strength can be increased and it can be used even under pressure.

FIG. 1 is a cross-sectional view showing a pipe according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a pipe according to the second embodiment of the present invention. FIG. 3 is a cross-sectional view showing an example of a pipe connection body using the pipe according to the first embodiment of the present invention. FIG. 4 is a cross-sectional view showing an example of a pipe connection body using pipes according to the second embodiment of the present invention.

  Hereinafter, the present invention will be described in detail.

(Plumbing)
The pipe according to the present invention is used with the connection target member connected to the end. The piping according to the present invention includes a tubular piping main body, a coating layer, and an adhesive layer. In the pipe according to the present invention, the coating layer is disposed on the outer surface of the pipe main body so as not to reach the end of the pipe. In the piping which concerns on this invention, the said contact bonding layer is arrange | positioned on the outer surface of the said piping main body in the edge part of piping. In the pipe according to the present invention, the solvent resistance of the pipe body is higher than the solvent resistance of the coating layer.

  In this invention, since said structure is provided, the connection strength of piping can be raised and piping can be used also under pressure. For example, when a pipe connection body in which a pipe and a connection target member are connected is produced, the connection strength in the axial direction of the pipe of the pipe connection body can be sufficiently increased. As a result, even if pressure is applied to the pipe connection body by water supply or the like, the pipe connection body can be used without disconnecting the pipe and the connection target member.

  Moreover, the solvent resistance of the said piping main body is higher than the solvent resistance of the said coating layer. The level of the solvent resistance can be determined by the following method.

Determination method of solvent resistance:
A pipe main body and a coating layer are independently subjected to 190 ° C. roll and 195 ° C. press working to produce a sample having a thickness of 2 mm. The obtained sample is immersed in the adhesive layer for 30 minutes, then dried, and determined by measuring the tensile strength.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. In the following drawings, the size, thickness, shape, and the like may differ from the actual size, thickness, shape, and the like for convenience of illustration.

  FIG. 1 is a cross-sectional view showing a pipe according to the first embodiment of the present invention.

  A pipe 1 shown in FIG. 1 is used with a connection target member connected to an end portion. Specifically, another pipe or a pipe joint is connected to the end of the pipe 1. The end of the pipe 1 is a connection region for connecting the connection target members.

  The pipe 1 includes a pipe main body 11, a covering layer 12, and an adhesive layer 13. The pipe body 11 is tubular. The pipe body 11 reaches the ends 1 a on both sides of the pipe 1. The pipe body 11 is an inner layer (first layer) of the pipe 1, and the covering layer 12 is an outer layer (second layer) of the pipe 1. The pipe 1 is a multilayer pipe formed by a pipe body 11 and a coating layer 12.

  The covering layer 12 is disposed on the outer surface of the pipe body 11 so as not to reach the end 1a of the pipe 1. The covering layer 12 is preferably arranged in a tubular shape. The coating layer 12 may be arranged on the outer surface of the pipe body 11 so as not to reach the terminal 1a on one side of the pipe 1, and the coating layer 12 does not reach the terminals 1a on both sides of the pipe 1. The pipe body 11 may be disposed on the outer surface.

  The pipe 1 has a region where the coating layer 12 is not disposed at the end. The adhesive layer 13 is disposed on the outer surface of the pipe body 11 at the end of the pipe 1. The adhesive layer 13 is preferably arranged in a tubular shape.

  In the present embodiment, the adhesive layer 13 is not disposed on the outer surface of the covering layer 12. The covering layer 12 and the adhesive layer 13 do not have an overlapping portion and are disposed adjacent to each other.

  In the present embodiment, the adhesive layer 13 is disposed on the entire outer surface of the pipe main body 11 from the end 1 a of the pipe 1 to the adjacent coating layer 12. The adhesive layer 13 is preferably disposed on the outer surface of the pipe main body 11 so as to reach the end 1a of the pipe 1. The adhesive layer may not be arranged on the entire outer surface of the pipe main body from the end of the pipe to the adjacent to the coating layer, and may be arranged on a part of the outer surface of the end of the pipe. . The adhesive layer and the coating layer may not be in contact with each other and may be separated from each other.

  In the piping, a layer different from the piping main body, the coating layer, and the adhesive layer may be disposed between the piping main body and the coating layer. The layer different from the pipe body, the coating layer, and the adhesive layer is not particularly limited, and is appropriately selected from the thermoplastic resin layer, the fiber reinforced resin layer, the gas barrier layer, the metal layer, the adhesive layer, and the like according to the intended function. Can be selected and combined.

  Examples of the material for the thermoplastic resin layer include olefin resins and vinyl chloride resins. Examples of the olefin resin include polyethylene, polypropylene, polybutene, ethylene-vinyl acetate copolymer, and ethylene-α-olefin copolymer.

  Examples of the fiber reinforced resin layer include a layer in which a thermoplastic resin and a reinforcing fiber are combined. The reinforcing fiber may be an inorganic fiber or an organic fiber. Examples of the inorganic fibers include glass fibers, carbon fibers, silicon / titanium / carbon fibers, boron fibers, and fine metal fibers. Examples of the organic fibers include aramid fibers, vinylon fibers, polyester fibers, and polyamide fibers. These reinforcing fibers include continuous fibers arranged in the longitudinal direction, continuous fibers arranged in the longitudinal direction and continuous fibers orthogonal or intersecting with the continuous fibers, and fibers of a finite length. It is used when it is arranged.

  FIG. 2 is a cross-sectional view showing a pipe according to the second embodiment of the present invention.

  A pipe 1A shown in FIG. 2 includes a pipe main body 11, a coating layer 12, and an adhesive layer 13A. The pipe body 11 reaches the ends 1Aa on both sides of the pipe 1A.

  In the pipe 1A shown in FIG. 2 and the pipe 1 shown in FIG. 1, only the adhesive layers 13A and 13 are different. The adhesive layer 13 </ b> A is disposed not only on the outer surface of the pipe body 11 but also on the outer surface of the coating layer 12. The adhesive layer 13 </ b> A is disposed on the outer surface of the end portion of the coating layer 12. The adhesive layer 13A portion disposed on the outer surface of the pipe body 11 and the adhesive layer 13A portion disposed on the outer surface of the coating layer 12 are continuous. The adhesive layer 13 </ b> A has a portion that overlaps the coating layer 12.

  In the present embodiment, the adhesive layer 13A is disposed on the entire outer surface of the pipe body 11 from the end 1Aa of the pipe 1A to the overlap with the coating layer 12. The adhesive layer only needs to have a portion that overlaps the coating layer, and may not be disposed on the entire outer surface of the pipe body from the end of the pipe to the coating layer. It may be arranged in the area of the part.

  From the viewpoint of further increasing the connection strength, the ratio of the total thickness of the pipe main body and the coating layer to the outer diameter of the pipe (total thickness of the pipe main body and the coating layer / the outer diameter of the pipe) is preferably Is 0.04 or more, more preferably 0.045 or more, preferably 0.2 or less, more preferably 0.15 or less.

  From the viewpoint of further increasing the connection strength, the length of the portion of the adhesive layer on the outer surface of the pipe body in the axial direction of the pipe (L1 in FIGS. 1 and 2) is preferably It is 5 mm or more, more preferably 10 mm or more, preferably 200 mm or less, more preferably 150 mm or less.

  From the viewpoint of further increasing the connection strength, the total thickness of the pipe body and the adhesive layer is thinner than the total thickness of the pipe body and the covering layer, and the pipe body and the adhesive layer The absolute value of the difference between the total thickness and the total thickness of the pipe body and the coating layer is preferably 10 μm or more, more preferably 40 μm or more, preferably 1000 μm or less, more preferably 300 μm or less. .

  From the viewpoint of practical use, and the viewpoint of improving hydraulic properties and workability, the outer diameter of the pipe is preferably 10 mm or more, more preferably 15 mm or more, preferably 600 mm or less, more preferably 400 mm or less. It is.

  From the viewpoint of practical use and the viewpoint of improving the pressure resistance, the thickness of the pipe body is preferably 1.0 mm or more, more preferably 2.0 mm or more, preferably 50 mm or less, more preferably 30 mm. It is as follows.

  From the viewpoint of further increasing the connection strength, the arithmetic average roughness Ra of the outer surface of the pipe body at the end of the pipe is preferably 0.05 μm or more, more preferably 0.1 μm or more, and preferably 3000 μm. Below, it is more preferably 500 μm or less, still more preferably 100 μm or less. Moreover, it is preferable that arithmetic mean roughness of the outer surface where the said adhesive layer of the said piping main body is arrange | positioned is more than the said minimum, and it is preferable that it is below the said upper limit.

  The arithmetic average roughness Ra is measured according to JIS B0601: 2001.

  From the viewpoint of further increasing the connection strength, the adhesive layer preferably contains a solvent that can swell or dissolve the outer surface of the pipe body. From the viewpoint of further increasing the connection strength, the adhesive layer preferably contains a solvent that can swell or dissolve the outer surface of the coating layer.

(Piping connection)
The pipe connector according to the present invention includes the pipe described above and a connection target member connected to an end of the pipe. The connection target member is not particularly limited as long as it is a member used by being connected to the end of the pipe, and examples thereof include pipe joints and other pipes.

  FIG. 3 is a cross-sectional view showing an example of a pipe connection body using the pipe according to the first embodiment of the present invention.

  A pipe connector 21 shown in FIG. 3 includes a pipe 1 and a connection target member 31. The pipe 1 is the pipe 1 shown in FIG. The pipe 1 and the connection target member 31 are connected at the end of the pipe 1. The pipe 1 and the connection target member 31 are connected via an adhesive layer 13 disposed at the end of the pipe 1.

  Moreover, FIG. 4 is sectional drawing which shows an example of the piping connection body using the piping which concerns on the 2nd Embodiment of this invention.

  A pipe connector 21A shown in FIG. 4 includes a pipe 1A and a connection target member 31A. The pipe 1A is the pipe 1A shown in FIG. The pipe 1A and the connection target member 31A are connected at the end of the pipe 1A. The pipe 1A and the connection target member 31A are connected via an adhesive layer 13A disposed at the end of the pipe 1A.

  In the pipe connection body according to the present invention, it is preferable that the adhesive layer in the pipe is exposed from an end of the connection target member on the pipe side. The gap between the pipe and the connection target member can be protected because the adhesive layer is exposed from the end of the connection target member on the pipe side.

  From the viewpoint of more reliably filling the gap between the pipe and the connection target member and further increasing the connection strength, it is exposed from the pipe side end of the connection target member of the adhesive layer in the pipe. The length of the portion in the axial direction of the pipe (L2 in FIGS. 3 and 4) is preferably 0.1 mm or more, more preferably 0.5 mm or more, and preferably 50 mm or less. Is 10 mm or less.

  Hereinafter, other details of the piping will be described.

(Piping body and coating layer)
The material of the piping main body is not particularly limited, and examples thereof include vinyl chloride resin (PVC resin) and polymethyl methacrylate resin (PMMA resin). Only 1 type may be used for the material of the said piping main body, and 2 or more types may be used together.

  The vinyl chloride resin (PVC resin) is not particularly limited, and any conventionally known vinyl chloride resin may be used. Examples of the vinyl chloride resin include vinyl chloride monomer homopolymers, copolymers of vinyl chloride monomers and monomers having an unsaturated bond copolymerizable with vinyl chloride monomers, polymers other than vinyl chloride, and copolymers. Examples thereof include a graft polymer obtained by graft polymerization of vinyl chloride on a polymer. As for the said vinyl chloride resin, only 1 type may be used and 2 or more types may be used together.

  The monomer having an unsaturated bond copolymerizable with the vinyl chloride monomer is not particularly limited; α-olefin compounds such as ethylene, propylene and butylene; vinyl ester compounds such as vinyl acetate and vinyl propionate; butyl vinyl ether and cetyl Vinyl ether compounds such as vinyl ether; (meth) acrylic acid ester compounds such as methyl (meth) acrylate, ethyl (meth) acrylate, and butyl (meth) acrylate; aromatic vinyl compounds such as styrene and α-methylstyrene; N-phenylmaleimide N-substituted maleimide compounds such as N-cyclohexylmaleimide and the like. As for the monomer which has the unsaturated bond copolymerizable with the said vinyl chloride monomer, only 1 type may be used and 2 or more types may be used together.

  The polymer and copolymer for graft copolymerization of vinyl chloride are not particularly limited, and ethylene-vinyl acetate copolymer, ethylene-vinyl acetate-carbon monoxide copolymer, ethylene-ethyl acrylate copolymer, ethylene- Examples include butyl acrylate-carbon monoxide copolymer, acrylonitrile-butadiene copolymer, polyurethane, chlorinated polyethylene, and chlorinated polypropylene. Only 1 type may be used for the polymer and copolymer which graft-polymerize vinyl chloride, and 2 or more types may be used together.

  The degree of polymerization of the vinyl chloride resin is preferably 100 or more, and preferably 10,000 or less. If the degree of polymerization is equal to or higher than the lower limit, long-term performance such as fatigue characteristics is not easily impaired. When the degree of polymerization is less than or equal to the above upper limit, it is not necessary to have a high temperature at the time of molding, and the workability is further improved.

  The vinyl chloride resin may be used in combination with other organic materials as long as the effects of the present invention are not impaired. For example, an acrylic resin or the like may be used in combination with the vinyl chloride resin for further improving the mechanical strength.

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

  The material of the coating layer is not particularly limited as long as the material has characteristics that the pipe body does not have, such as weather resistance and gas barrier properties, and acrylonitrile-ethylene-propylene-styrene resin (AES resin), acrylonitrile-styrene. -Acrylate resin (ASA resin), polymethyl methacrylate (PMMA), etc. are mentioned. As for the material of the said coating layer, only 1 type may be used and 2 or more types may be used together.

(Adhesive layer)
It does not specifically limit as said adhesive layer, Adhesives, such as "Eslon adhesive No.73S" by Sekisui Chemical Co., Ltd., "Eslon adhesive No.100S", are mentioned. As the adhesive layer, solvents such as THF, methyl ethyl ketone, cyclohexanone, acetone, cyclohexane, ethyl acetate, and ethanol can be used.

(Other details of piping)
You may use various additives for the said piping as needed. Examples of the additives include stabilizers, stabilization aids, lubricants, processing aids, impact modifiers, heat resistance improvers, antioxidants, ultraviolet absorbers, light stabilizers, fillers, pigments, and plasticizers. Can be mentioned. As for the said additive, only 1 type may be used and 2 or more types may be used together.

  It does not specifically limit as said stabilizer, A heat stabilizer, a heat stabilization adjuvant, etc. are mentioned. The heat stabilizer is not particularly limited, and examples thereof include an organic tin stabilizer, a lead stabilizer, a calcium-zinc stabilizer, a barium-zinc stabilizer, and a barium-cadmium stabilizer. Examples of the organotin stabilizer include dibutyltin mercapto, dioctyltin mercapto, dimethyltin mercapto, dibutyltin mercapto, dibutyltin malate, dibutyltin malate polymer, dioctyltin malate, dioctyltin malate polymer, dibutyltin laurate, and And dibutyltin laurate polymer. As for the said heat stabilizer, only 1 type may be used and 2 or more types may be used together.

  The heat stabilization aid is not particularly limited, and examples thereof include epoxidized soybean oil, phosphate ester, polyol, hydrotalcite, and zeolite. As for the said heat stabilization adjuvant, only 1 type may be used and 2 or more types may be used together.

  Examples of the lubricant include an internal lubricant and an external lubricant. The internal lubricant is used for the purpose of lowering the flow viscosity of the molten resin during molding and preventing frictional heat generation. The internal lubricant is not particularly limited, and examples thereof include butyl stearate, lauryl alcohol, stearyl alcohol, epoxy soybean oil, glycerin monostearate, stearic acid, and bisamide. The external lubricant is used for the purpose of increasing the sliding effect between the molten resin and the metal surface during molding. The external lubricant is not particularly limited, and examples thereof include paraffin wax, polyolefin wax, ester wax, and montanic acid wax. As for the said lubricant, only 1 type may be used and 2 or more types may be used together.

  The processing aid is not particularly limited, and examples thereof include acrylic processing aids. Examples of the acrylic processing aid include an alkyl acrylate-alkyl methacrylate copolymer having a weight average molecular weight of 100,000 to 2,000,000, specifically, an n-butyl acrylate-methyl methacrylate copolymer, and Examples include 2-ethylhexyl acrylate-methyl methacrylate-butyl methacrylate copolymer. As for the said processing aid, only 1 type may be used and 2 or more types may be used together.

  The impact modifier is not particularly limited, and examples thereof include methyl methacrylate-butadiene-styrene copolymer (MBS), chlorinated polyethylene, and acrylic rubber. As for the said impact modifier, only 1 type may be used and 2 or more types may be used together.

  The heat resistance improver is not particularly limited, and examples thereof include α-methylstyrene-based and N-phenylmaleimide-based resins. As for the said heat-resistant improver, only 1 type may be used and 2 or more types may be used together.

  It does not specifically limit as said antioxidant, A phenolic antioxidant etc. are mentioned. As for the said antioxidant, only 1 type may be used and 2 or more types may be used together.

  The ultraviolet absorber is not particularly limited, and examples thereof include salicylic acid ester ultraviolet absorbers, benzophenone ultraviolet absorbers, benzotriazole ultraviolet absorbers, and cyanoacrylate ultraviolet absorbers. As for the said ultraviolet absorber, only 1 type may be used and 2 or more types may be used together.

  The light stabilizer is not particularly limited, and examples thereof include hindered amine light stabilizers. As for the said light stabilizer, only 1 type may be used and 2 or more types may be used together.

  It does not specifically limit as said filler, A calcium carbonate, a talc, etc. are mentioned. As for the said filler, only 1 type may be used and 2 or more types may be used together.

  It does not specifically limit as said pigment, An organic pigment and an inorganic pigment are mentioned. Examples of the organic pigment include azo organic pigments, phthalocyanine organic pigments, selenium organic pigments, and dye lake organic pigments. Examples of the inorganic pigment include oxide inorganic pigments, molybdenum chromate inorganic pigments, sulfide / selenide inorganic pigments, and ferrocyanide inorganic pigments. As for the said pigment, only 1 type may be used and 2 or more types may be used together.

  The plasticizer may be added for the purpose of improving processability during molding. Since the heat resistance of the molded product may be lowered by the addition of the plasticizer, it is preferable that the amount of the plasticizer added is small. The plasticizer is not particularly limited, and examples thereof include dibutyl phthalate, di-2-ethylhexyl phthalate, and di-2-ethylhexyl adipate. As for the said plasticizer, only 1 type may be used and 2 or more types may be used together.

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

  The following materials were prepared as piping materials.

Piping body:
(1) PVC resin (“TS-1000R” manufactured by Tokuyama Sekisui Industry Co., Ltd.)

Coating layer:
(1) AES resin ("UB700A" manufactured by Nippon A & L)
(2) ASA resin ("UA1400" manufactured by Nippon A & L)
(3) PMMA resin (Kuraray "Parapet SA")
(4) PVC resin (“TS-1000R” manufactured by Tokuyama Sekisui Industry Co., Ltd.)

  The following materials were prepared as connection target members.

  (1) TS socket (“TS50” manufactured by Sekisui Chemical Co., Ltd.)

  The following materials were prepared as the material for the adhesive layer.

(1) Eslon adhesive ("No. 73S" manufactured by Sekisui Chemical Co., Ltd.)
(2) Eslon adhesive ("No. 100S" manufactured by Sekisui Chemical Co., Ltd.)
(3) Cyclohexanone (solvent, manufactured by Wako Pure Chemical Industries, Ltd.)

Example 1
(1) Preparation of piping In the structure shown in Table 1 below, piping was formed under the following extrusion conditions. A pipe whose outer surface was covered with a coating layer was obtained. The outer diameter of the obtained pipe was 60 mm, the thickness of the pipe body was 4.1 μm, and the thickness of the coating layer was 60 μm.

[Extrusion conditions]
Extruder: “SLM50” manufactured by Nagata Manufacturing Co., Ltd. (two-axis different direction parallel extruder)
Sub-extruder: “OPE-40” (single screw extruder) manufactured by Nagata Seisakusho Co., Ltd.
Mold: Pipe mold, Nominal diameter 50A for multi-layer pipe production Total extrusion rate: 20kg / h
Resin temperature: Pipe body (inner layer) 190 ° C (temperature at the mold inlet)
Coating layer (outer layer) 220 ° C. (temperature at the mold inlet)

(2) Production of adhesive layer The surface of one end of the obtained pipe was cut to a depth of 60 μm (thickness difference) over a length of 45 mm (length of the pipe having a thickness difference). The pipe body was exposed by cutting the surface of the pipe. The adhesive layer shown in Table 1 below was applied to the exposed outer surface of the pipe body and the coating layer of the pipe to produce an adhesive layer. About the part located on the outer surface of the said piping main body of the said contact bonding layer, the length L1 in the axial direction of piping of this part was 45 mm.

(3) Production of pipe connection body A pipe connection body was produced by joining the obtained pipe and a connection target member (TS socket). Moreover, about the part exposed from the said pipe | tube side end of the said connection object member of the said contact bonding layer in the said pipe | tube, the length L2 in the axial direction of the said pipe | tube was 10 mm.

(Example 2)
The surface of the pipe was shaved at one end of the obtained pipe with a length (length of the pipe having a thickness difference) of 35 mm and a thickness (thickness difference) of 100 μm, and the length L1 was set to 35 mm. And the piping connection body was produced like Example 1 except having used ESLON adhesive ("No.73S" by Sekisui Chemical Co., Ltd.) as an adhesion layer.

(Example 3)
The surface of the pipe was shaved at one end of the obtained pipe with a length (pipe length having a thickness difference) of 50 mm and a thickness (thickness difference) of 100 μm, and the length L1 was set to 50 mm. A pipe connector was prepared in the same manner as in Example 1 except that cyclohexanone (solvent, manufactured by Wako Pure Chemical Industries, Ltd.) was used as the adhesive layer.

Example 4
A pipe connection body was produced in the same manner as in Example 2 except that the length L2 was 0.5 mm.

(Example 5)
A pipe connector was produced in the same manner as in Example 1 except that the material of the coating layer (outer layer) was changed to ASA resin when producing the pipe.

(Example 6)
A pipe connector was produced in the same manner as in Example 1 except that the material of the coating layer (outer layer) was changed to PMMA resin when the pipe was produced.

(Comparative Example 1)
When producing the piping, the material of the coating layer (outer layer) was changed to PVC resin (“TS-1000R” manufactured by Tokuyama Sekisui Kogyo Co., Ltd.). Except having produced the said adhesive layer on the outer surface of the said coating layer, and having used Eslon adhesive ("No. 73S" by Sekisui Chemical Co., Ltd.) as an adhesive layer, it carried out similarly to Example 1. A pipe connector was prepared.

(Comparative Example 2)
A pipe connector was produced in the same manner as in Example 1 except that one end of the obtained pipe was not cut and the adhesive layer was produced on the outer surface of the coating layer of the pipe.

(Comparative Example 3)
One end of the obtained pipe was not cut, but the adhesive layer was produced on the outer surface of the coating layer of the pipe, and ESRON adhesive (Sekisui Chemical Co., Ltd. “No. 73S” was used as the adhesive layer. “)” Was used in the same manner as in Example 1 except that a pipe connector was produced.

(Evaluation)
(1) Surface roughness After shaving the surface of the obtained pipe, the arithmetic average roughness Ra of the exposed outer surface of the pipe body was measured in accordance with JIS B0601: 2001.

(2) Connection strength A dumbbell-shaped sample was cut out in the axial direction of the pipe from the connection portion of the obtained pipe connection body, and a tensile test was performed under conditions of 60 ° C. and a tensile speed of 5 mm / min. From the test results obtained, the tensile strength was calculated as the connection strength. As the tensile tester, “desktop precision universal testing machine AGS-X” manufactured by Shimadzu Corporation was used.

(3) Strength of coating layer The resin used for the coating layer of the said piping was rolled at 190 degreeC for 3 minute (s), and it pressed on the following conditions, and produced the press plate of thickness 2mm. This press plate was immersed in the adhesive layer for 30 minutes, then dried at 23 ° C. for 12 hours, and further dried at 60 ° C. for 24 hours. A dumbbell-shaped sample was cut out from the dried press plate, and a tensile test was performed under conditions of 60 ° C. and a tensile speed of 10 mm / min. From the test results obtained, the tensile strength was calculated as the strength of the coating layer. As the tensile tester, “desktop precision universal testing machine AGS-X” manufactured by Shimadzu Corporation was used.

[Press conditions]
Heating temperature: 195 ° C
Heating time: 3 minutes Preheat temperature: 195 ° C
Preheating time: 3 minutes Pressing pressure: 20 MPa
Press time: 3 minutes

(4) Fracture time (long-term hydraulic fracture test)
Using the obtained pipe connection body, a water pressure of 1 MPa was applied to the pipe at 60 ° C., and the time until the pipe connection body was broken was measured.

(5) Impact resistance retention rate The obtained pipe connector was subjected to a weather resistance test for 800 hours under the following conditions. As a weather resistance tester, “Metal Weather” manufactured by Daipla Intes was used. After the weather resistance test, a drop weight test was performed at 0 ° C. using a 3 kg weight. As a falling weight tester, “FALLING DART IMPACT TESTER” manufactured by Yasuda Seiki Seisakusho Co., Ltd. was used. From the impact strength before and after the weather resistance test, the impact resistance retention was calculated by the following formula. The impact resistance retention was determined according to the following criteria.

  Impact resistance retention rate (%) = (impact strength after weather resistance test) / (impact strength before weather resistance test) × 100

[Weather resistance test conditions]
Operation mode: L + D
L: Irradiation intensity 75 mW / cm ² , Black panel temperature 50 ° C., humidity 50%, 4 hours D: No irradiation, black panel temperature 30 ° C., humidity 98%, 4 hours Shower: 30 seconds before and after D

[Judgment criteria for impact resistance retention]
○: Impact resistance retention ratio is 80% or more Δ: Impact resistance retention ratio is 50% or more and less than 80% ×: Impact resistance retention ratio is less than 50%

  The results are shown in Table 1.

DESCRIPTION OF SYMBOLS 1, 1A ... Piping 1a, 1Aa ... Terminal 11 ... Piping body 12 ... Covering layer 13, 13A ... Adhesive layer 21, 21A ... Piping connector 31, 31A ... Connection object member

Claims (10)

It is a pipe that is used with a connection target member connected to an end,
A tubular pipe body, a coating layer, and an adhesive layer;
The coating layer is disposed on the outer surface of the pipe body so as not to reach the end of the pipe,
The adhesive layer is disposed on the outer surface of the pipe body at the end of the pipe,
The pipe body has a solvent resistance higher than that of the coating layer. The ratio of the total thickness of the pipe body and the coating layer to the outer diameter of the pipe is 0.04 or more and 0.2 or less,
For the portion of the adhesive layer located on the outer surface of the pipe body, the length of the pipe in the axial direction is not less than 5 mm and not more than 200 mm.
The total thickness of the pipe body and the adhesive layer is thinner than the total thickness of the pipe body and the coating layer, and the total thickness of the pipe body and the adhesive layer; The piping according to claim 1, wherein an absolute value of a difference from the total thickness with the coating layer is 10 µm or more and 1000 µm or less.   The piping according to claim 1 or 2, wherein an arithmetic average roughness Ra of an outer surface of the piping main body at an end portion of the piping is 0.05 µm or more and 3000 µm or less.   The piping according to any one of claims 1 to 3, wherein the adhesive layer includes a solvent capable of swelling or dissolving the outer surface of the piping main body.   The piping according to any one of claims 1 to 4, wherein the adhesive layer includes a solvent capable of swelling or dissolving the outer surface of the coating layer.   The pipe according to any one of claims 1 to 5, wherein the adhesive layer is disposed on an outer surface of the pipe main body so as to reach an end of the pipe.   The piping according to any one of claims 1 to 6, wherein the adhesive layer is also disposed on an outer surface of the coating layer. The piping according to any one of claims 1 to 7,
A pipe connection body comprising a connection target member connected to an end of the pipe.   The pipe connection body according to claim 8, wherein the adhesive layer in the pipe is exposed from an end of the connection target member on the pipe side.   The length of the pipe in the axial direction of the pipe is 50 mm or less with respect to a portion of the pipe exposed from the pipe side end of the connection target member of the adhesive layer. Piping connection body.

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