JP2003175518A - Joint and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily obtain a pipe joint excellent in quality stability, chemical resistance and pressure resistance without relying on the skillfulness of a worker, and a method for manufacturing the same. <P>SOLUTION: In the method for manufacturing the pipe joint into which a tubular member is inserted from the receiving port part provided to one end opening of the pipe joint, an almost tubular molded body comprising a hard vinyl chloride resin is arranged to the part constituting the receiving port part of an inner mold and a polymerizable composition containing a norbornene monomer and a metathesis polymerization catalyst is injected in the gap between inner and outer molds and polymerized and cured to mold the pipe joint wherein the receiving port part formed by the almost tubular molded body comprising the hard vinyl chloride resin is integrated with inner peripheral surface of a norbornene resin. The contact surface of the almost tubular molded body and the polymerizable composition is pre-coated with a primer comprising 10-90 pts.wt. of the norbornen monomer and 90-10 pts.wt. of a solvent attacking the hard vinyl chloride resin. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint made of synthetic resin and a method for manufacturing the same, and more particularly, to a pipe joint capable of firmly joining tubular bodies such as fiber reinforced vinyl chloride resin pipes and a method for manufacturing the same.

[0002]

2. Description of the Related Art In industrial piping such as Soda plant, pressure resistance, heat resistance and chemical resistance are required. An example of a pipe material used for this type of application is Japanese Patent Publication No. 2-24655.
It is disclosed in the publication. That is, this prior art discloses a fiber-reinforced thermosetting resin-reinforced vinyl chloride-based resin pipe obtained by reinforcing a vinyl chloride-based resin pipe with a fiber-reinforced thermosetting resin layer. Since the outer surface is reinforced with the fiber-reinforced thermosetting resin layer, pressure resistance and heat resistance are enhanced, and the expansion and contraction of the tube due to thermal expansion is small. Furthermore, since this pipe material is lighter in weight than steel pipe, it is said that it is easy to handle during transportation and construction and has excellent chemical resistance.

However, as a joint used when piping a fiber-reinforced thermosetting resin-reinforced vinyl chloride resin pipe, a joint made of the same material, that is, a material obtained by coating the outer surface of a hard vinyl chloride resin with an FRP layer. However, there is a problem that the process is very complicated to manufacture.

That is, as a method of manufacturing a joint made of the above materials, a joint made of a hard vinyl chloride resin which is manufactured by injection molding in advance or a hard vinyl chloride pipe and a joint are expanded, reduced in diameter, and cut by hand. For hard vinyl chloride resin processed joints obtained by combining adhesive, welding, etc.
A method of laminating FRP by a hand layup method can be mentioned. In this method, when trying to obtain a large-diameter joint, it takes about two days to manufacture one joint. Further, since the worker has a very skilled skill in welding work and FRP stacking work, the number of workers is limited, and if an unfamiliar worker manufactures, there is a possibility that water leakage or the like may occur due to poor welding or poor stacking of the FRP layer. .

[0005]

As described above, when an attempt is made to obtain a joint made of the fiber reinforced thermosetting resin reinforced vinyl chloride resin described in the above-mentioned prior art, a complicated work by a skilled worker is required. It was necessary, and there was a risk that the stability of quality would be insufficient. In addition, since many manual operations are required, it takes a long time to manufacture, productivity is low, and manufacturing cost is high.

The object of the present invention is to solve the above-mentioned drawbacks of the prior art and not only to be excellent in pressure resistance, heat resistance and chemical resistance, but also not requiring a high degree of skill of an operator and productivity. (EN) An excellent joint and a manufacturing method thereof.

[0007]

A first invention of the present application is a method for manufacturing a tubular joint in which a tubular body is inserted from a receiving portion side provided at an opening at one end, and the tubular joint is an inner mold. A substantially tubular molded body made of a hard vinyl chloride resin is arranged in a portion constituting the mouth portion, and the substantially tubular molded body and the outer mold also serve as an inner mold or an inner mold in which the substantially tubular molded body is arranged. A polymerizable composition containing a norbornene-based monomer and a metathesis polymerization catalyst is injected into the space, and the polymerizable composition is polymerized and cured to form a substantially tubular shape made of the hard vinyl chloride resin on the inner peripheral surface of the norbornene-based resin. In molding a joint in which the receiving part constituted by the molded body is integrated, at least before polymerizing the polymerizable composition, on the contact surface between the substantially tubular molded body and the polymerizable composition, 10 to 90 weight of norbornene-based monomer When a joint manufacturing method, characterized in that to keep applying a primer containing a solvent 90 to 10 parts by weight of affecting the hard vinyl chloride resin.

A second invention of the present application is a joint obtained according to the manufacturing method of the first invention, which comprises a tubular joint body made of norbornene resin and an inner peripheral surface of the opening at the opening side at one end of the joint body. And a receiving portion formed of a substantially tubular molded body made of hard vinyl chloride resin.

The details of the present invention will be described below. In the present specification, the "joint" is a pipe used for joining tubular bodies such as a hard vinyl chloride resin pipe whose outer peripheral surface is reinforced with FRP (hereinafter abbreviated as hard vinyl chloride resin / FRP composite pipe). Widely include joints. The shape of such a pipe joint is not particularly limited, and the 90 degree elbow, 4
5 degree elbow, socket, reduced diameter socket, cheese, reduced diameter cheese, flange and the like. These joints have a tubular shape that is linear, curved, or partially bent, and has a structure in which the tubular body is inserted from the receiving end side provided at the one end opening.

In the manufacturing method according to the present invention, a molding die is prepared. The outer mold is not particularly limited, and a known general mold that has been conventionally used for manufacturing a joint can be used. For example, a metal mold made of a metal such as carbon steel, ductile cast iron, aluminum, copper or nickel, a thermoplastic resin or a thermosetting resin, or a composite of a thermosetting resin and a reinforcing fiber such as glass fiber. Examples thereof include a resin mold made of FRP, a wood mold, a rubber mold, a paper mold, a sand mold, and a lost wax mold.

The term "receptacle portion" of the joint means a portion which is brought into contact with and joined to the tubular body when connecting the joint and the tubular body. In the present invention, for example, as shown in FIG. 1, a substantially tubular molded body 3 made of a hard vinyl chloride resin is arranged in a portion of the inner mold 2 which constitutes the above-mentioned receiving portion. The hard vinyl chloride resin used here is not particularly limited, and known ones can be used. Chlorinated hard vinyl chloride resin, impact-resistant hard vinyl chloride resin, or the like can be used depending on the usage conditions of the pipeline. Further, as the above-mentioned substantially tubular molded body 3, a hard vinyl chloride resin pipe or a product obtained by expanding the diameter of a hard vinyl chloride resin pipe may be used for forming a joint.

By using the above-mentioned substantially tubular molded body 3 only for the receiving portion of the joint, a hard vinyl chloride resin joint which has been conventionally used by injection molding and a rigid vinyl chloride resin pipe and joint can be obtained. The joint can be easily obtained according to the present invention without using a hard vinyl chloride resin-processed joint manufactured by combining diameter expansion, diameter reduction, cutting, bonding, welding and the like. Therefore, it is possible to obtain a joint excellent in quality stability without having a skill level of work as compared with the current joint for a hard vinyl chloride resin / FRP composite pipe. Also, the productivity of the joint can be increased,
And cost reduction can be achieved.

Further, in the present invention, as the above-mentioned substantially tubular molded body, a hard vinyl chloride resin joint manufactured by injection molding in advance or a hard vinyl chloride resin pipe and a joint are expanded, reduced in diameter, cut, and bonded. Alternatively, a hard vinyl chloride resin processed joint obtained by combining welding processes may be used.
However, when the hard vinyl chloride resin joint or the hard vinyl chloride resin processed joint is not readily available, the complicated work described above is forced to manufacture them, and therefore, instead of these joints, simple joints are used. It is desirable to use a hard vinyl chloride resin pipe or a pipe obtained by expanding the diameter of a hard vinyl chloride resin pipe.

In manufacturing the joint of the present invention, the inner mold 2 is used as a core, if necessary. This inner mold 2
The material constituting the same as the material constituting the outer mold,
Known materials can be used. Further, as described above, the substantially tubular shaped body 3 made of the hard vinyl chloride resin is arranged in the portion constituting the inner mouth part, but the substantially tubular shaped body made of the hard vinyl chloride resin is disposed. May be arranged only in the receiving portion, or may be arranged so as to extend beyond the receiving portion. Further, unlike FIG. 1, the entire inner mold may be formed of a substantially tubular molded body made of hard vinyl chloride resin. That is, in the present invention, the step of "arranging a substantially tubular molded body made of a hard vinyl chloride resin in the constituent portion of the inner mold receiving portion" is a case where the tubular molded body and the inner mold are made of different materials. In addition, a method of arranging a substantially tubular molded body made of a hard vinyl chloride resin in the receiving portion of the inner mold and a method of forming the entire inner mold by the substantially tubular molded body made of a hard vinyl chloride resin are also included.

When the above-mentioned substantially tubular molded body is arranged as a member separate from the inner mold in the receiving portion, the substantially tubular molded body is brought into contact with the outer peripheral surface of the portion constituting the receiving portion of the inner mold. However, a lubricant, a release agent, a sealing agent, etc. may be used for the contact interface, if necessary, within a range not hindering the achievement of the object of the present invention. Alternatively, the substantially tubular molded body and the inner mold may be simply mixed.

In the present invention, the polymerizable composition 5 containing a norbornene-based monomer and a metathesis polymerization catalyst is injected into the space between the inner mold 2 and the outer mold 1, and the polymerizable composition is polymerized and cured. Then, a substantially tubular molded body 3 made of the above-mentioned hard vinyl chloride resin is formed on the inner peripheral surface of the norbornene-based resin.
A joint in which the receiving portion configured by is integrated is molded.

The norbornene-based resin is not particularly limited, and a homopolymer of a norbornene-based monomer or a ring-opening copolymerizable one or two or more monomers capable of ring-opening copolymerization with a norbornene-based monomer and a norbornene-based monomer are ring-opened. A copolymer obtained by metathesis polymerization can be used.

The norbornene resin is excellent in mechanical properties such as strength or elastic modulus under a high temperature environment. Therefore, when a joint made of norbornene-based resin is manufactured according to the present invention, pressure resistance and heat resistance can be improved. Therefore, for example, when a hard vinyl chloride resin pipe reinforced with FRP is used as the pipe forming the pipe, the pipe material has excellent pressure resistance and heat resistance, but the joint constructed according to the present invention is used. As a result, the joint is also excellent in pressure resistance and heat resistance, so that the pressure resistance and heat resistance of the entire pipeline can be made sufficiently large.

When the joint is shaped like an elbow or cheese, the stress due to the expansion and contraction of the pipe is likely to be applied. However, since the joint according to the present invention is made of norbornene-based resin, it is unlikely to be cracked or deformed even under severe conditions in which internal water pressure and external stress are applied at high temperature.
Further, since norbornene-based resin has excellent chemical resistance, even if it is used under severe conditions such as Soda plant where high-temperature chemicals flow, it is superior in reliability compared to joints made of other materials. There is. Furthermore, the polymerizable composition solution for obtaining the norbornene-based resin has a very low viscosity and can be molded under low pressure, so that a large joint can be manufactured with high accuracy and at low cost. Further, since the joint of the present invention can be molded in a short time, the productivity can be improved as compared with the current FRP reinforced rigid vinyl chloride resin joint.

Specific examples of the norbornene-based monomer include bicyclic compounds such as 2-norbornene and norbornadiene, tricyclic compounds such as dicyclopentadiene and dihydrodicyclopentadiene, tetracyclododecene and ethylidenetetracyclododecene. , Tetracycles such as phenyltetracyclododecene, pentacycles such as tricyclopentadiene, heptacycles such as tetracyclopentadiene, and alkyl substitution products thereof (eg methyl, ethyl, propyl, butyl substitution products, etc.) , Alkylidene substitution products (eg ethylidene substitution products), aryl substitution products (eg phenyl, tolyl substitution products), epoxy groups, methacryl groups, hydroxyl groups, amino groups, carboxyl groups, cyano groups, halogen groups, ethers Groups, polar groups such as ester bond-containing groups Derivatives, and the like. These norbornene-based monomers may be used alone or in combination of two or more.

Further, monocyclic cycloolefins such as cyclobutene, cyclopentene, cyclopentadiene, cyclooctene and cyclododecene which are capable of ring-opening polymerization with one kind of norbornene type monomers, or cyclic monomers such as indene, chroman and chroman-indene type comonomers. Can be used within a range that does not impair the object of the present invention. Further, a crosslinkable cyclic monomer such as tetrahydroindene may be used in combination.

As a catalyst for ring-opening metathesis polymerization of a norbornene-based monomer, tungsten,
Halides, oxyhalides, oxides or organic ammonium salts of metals such as molybdenum, tantalum, ruthenium, rhenium, osmium, and titanium are mentioned and preferably used. These metathesis polymerization complexes may be used alone or in combination of two or more.

When ring-opening metathesis polymerization of a norbornene-based monomer is required to be carried out in air as a process, it is preferable to select a catalyst having excellent stability over time in air among the above metathesis polymerized complexes. For this, a ruthenium carbene catalyst represented by the following general formula (a) and a ruthenium vinylidene catalyst represented by the general formula (b) are preferably used. These ruthenium carbene catalysts and ruthenium vinylidene catalysts may be used alone or in combination of two or more.

[0024]

[Chemical 1]

[0025]

[Chemical 2]

In the above general formulas (a) and (b), R1 and R2 may be the same or different, and are nitrogen, an alkenyl group having 2 to 20 carbon atoms and a carbon number, respectively. 1-20 alkyl or aryl groups, 1-20 carbon carboxylates, 1-2 carbons
0 alkoxy group, C2-C20 alkenyloxy group, or aryloxy group, C2-C20 alkoxycarbonyl group, C1-C20 alkylsilyl group or arylsilyl group, C1-C20 Alkylthio group, thioalkyl group or thioaryl group (above alkenyl group, alkyl group, aryl group, carboxylate, alkoxy group, alkenyloxy group, aryloxy group, alkoxycarbonyl group, alkylsilyl group, arylsilyl group, alkylthio group, thioalkyl The group and the thioaryl group are an alkyl group having 1 to 5 carbon atoms, a halogen or an alkoxy group having 1 to 5 carbon atoms, or, if necessary, an alkyl group having 1 to 5 carbon atoms, a halogen or an alkoxy group having 1 to 5 carbon atoms. Required by a phenyl group substituted by a group It may be substituted in accordance with the.)
It also means a ferrocene derivative. X1 and X2 are
It may be the same or different and is any desired anionic ligand, L1 and L2 may be the same or different and any desired neutral electron. Means a donor, and among X1, X2, L1 and L2,
Two or three may together form a multidentate chelating ligand.

In a more preferred catalyst, in the general formulas (a) and (b), R1 and R2 are independently of each other hydrogen, methyl, ethyl, t-butyl, phenyl or ferrocenyl, or methyl, ethyl, phenyl, A vinyl group optionally substituted with ferrocenyl, wherein X1 and X2 independently of each other are Cl or Br.
And L1 and L2 are, independently of each other, trimethyl,
Phosphine, triethylphosphine, triisopropylphosphine, triphenylphosphine or tricyclohexylphosphine.

The amount of the above-mentioned metathesis polymerization catalyst used in the ring-opening metathesis polymerization of the norbornene-based monomer varies depending on the activity of the metathesis polymerization catalyst, so it cannot be said uniquely, but it is 1/5 to 1/1 based on all the monomers. It is preferably 500,000 molar equivalents. If the amount of the metathesis polymerization catalyst used relative to all the monomers is more than 1/5 equivalent, the molecular weight of the obtained resin will not be sufficiently increased, and if it is less than 1 / 500,000 equivalent, the polymerization rate will be low.

The above norbornene-based resin may be added to the above-mentioned norbornene-based resin, if necessary, within a range that does not impair the achievement of the present invention, a filler, a reinforcing material, an antioxidant (antiaging agent), a foaming agent, an antifoaming agent, One or more of various additives such as thixotropic agents, antistatic agents, molecular weight modifiers, polymer modifiers, flame retardants, softeners, plasticizers, surfactants and elastomers are added. May be. Further, it may be colored with a dye, a pigment, a coloring agent or the like.

The norbornene-based resin has sufficient strength, rigidity, heat resistance, etc. even when it is used alone.
Particularly in applications where high strength, high rigidity, high heat resistance, etc. are required, the physical properties can be further improved by compounding with an inorganic filler or reinforcing fiber. The norbornene-based resin compounded with the inorganic filler and the reinforcing fiber has high rigidity. Therefore, when rigidity is particularly required, not only is it effective in strength design, but also the linear expansion coefficient decreases, so norbornene resin decreases. It is also preferable in terms of dimensional stability of the resin-based molded product.

As the filler, calcium carbonate, aluminum hydroxide, magnesium carbonate, sodium hydrogen carbonate, clay, talc, mica, silica, kaolin, fly ash, montmorillonite, glass balloon, silica balloon, heat-expandable vinylidene chloride particles, etc. And are preferably used. Among these, calcium carbonate, fly ash, and aluminum hydroxide are particularly preferable because they are low in cost and the physical properties of the molded product are good. Further, the norbornene-based resin filled with aluminum hydroxide exhibits flame retardancy. Further, a norbornene-based resin filled with glass balloons or silica balloons has good heat insulation. These fillers may be used alone or in combination of two or more. Moreover, the filler may be surface-treated with a coupling agent, a surface-treating agent, or the like, if necessary.

As the reinforcing material, for example, fibers such as glass fiber, carbon fiber, aramid fiber and the like can be mentioned, which are preferably used. The form of these fibers is not particularly limited, and may be short fibers or long fibers, or may be processed into a cloth shape, a mat shape, a non-woven shape, or the like. These fibers may be used alone or in combination of two or more. Further, the reinforcing material may be surface-treated with a coupling agent, a surface-treating agent or the like, if necessary.

Elastomers include natural rubber, polyisoprene, polybutadiene, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, chloroprene, styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer. A polymer, an ethylene-propylene copolymer, an ethylene-propylene-diene terpolymer, an ethylene-vinyl acetate copolymer and a hydride of these are mentioned and preferably used. These elastomers may be used alone or in combination of two or more.

As shown in FIG. 1, in the present invention, prior to the polymerization of the polymerizable composition, a norbornene-based monomer 1 is added to the contact surface between the substantially tubular shaped body 3 and the polymerizable composition 5.
0-90 parts by weight and a solvent that attacks hard vinyl chloride resin 50-
Primer 4 containing 10 parts by weight is applied.

Although the norbornene-based monomer contained in the primer is not particularly limited, it may be formed in a space formed between the outer mold and a substantially tubular molded body having at least a receiving portion made of a hard vinyl chloride resin. It is desirable to be the same as the above-mentioned norbornene-based monomer contained in the polymerizable composition to be injected.

Further, as a solvent for attacking the hard vinyl chloride resin, ethyl acrylate, butyl acrylate, acetylacetone, acetylene, acetaldehyde, acetone, allyl alcohol, ethanolamine, epichlorohydrin, amyl chloride, allyl chloride, methylene chloride, oxychloride. Phosphorus, xylene, creosote, chlorosulfonic acid, chloroform, amyl acetate, vinyl acetate, methyl acetate, phosphorus trichloride, diacetone, diethylamine, diethyl ether, cyclohexane, cyclohexanol,
Cyclohexanone, dimethylacetaldehyde, dimethylamine, dimethylformaldehyde, sulfamic acid, tetrachloroethylene, tetrahydrofuran, toluene, trichloroethylene, nitrobenzene, hydrazine, glacial acetic acid, pyridine, phenylhitrazine, phthalic acid, butylamine, butyl ether, benzenesulfonic acid, benzine, Acetic anhydride, sulfuric anhydride, methylamine, methylisobutylketone, methylethylketone, butyric acid, fuming sulfuric acid and the like are mentioned, and particularly acetone, tetrahydrofuran and methylethylketone are preferably used. These solvents may be used alone or in combination of two or more.

The above-mentioned primer may be added to the above-mentioned primer, if necessary, within a range not hindering achievement of the object of the present invention. Agents, antistatic agents, molecular weight regulators, polymer modifiers,
One or more of various additives such as flame retardants, softeners, plasticizers, surfactants and elastomers may be added. Further, it may be colored with a dye, a pigment, a coloring agent, or the like.

The method of applying the primer is not particularly limited, and a generally tubular molding formed of a hard vinyl chloride resin using a general brush or spatula, a polymerizable composition containing a norbornene-based monomer and a metathesis polymerization catalyst. It may be applied to the surface of a substantially tubular molded body formed of a hard vinyl chloride resin that comes into contact with an object.

The coating may be carried out just before the injection of the polymerizable composition containing the norbornene-based monomer and the metathesis polymerization catalyst, and it is formed in a substantially tubular shape made of a hard vinyl chloride resin. It may be applied before placing the body in the mold, or may be applied after placing the substantially tubular shaped body formed of a hard vinyl chloride resin in the die. It is preferable to apply the composition immediately before the injection of the polymerizable composition to 24 hours before the injection thereof, and more preferably, the application of the polymerizable composition preferably immediately before the injection to 12 hours before the injection.

Further, before applying the primer to the coated surface, sanding treatment or sandblasting treatment may be carried out as necessary to give irregularities to the coated surface to add a physical anchor effect. In this case, the substantially tubular molded body formed of the hard vinyl chloride resin and the polymerizable composition containing the norbornene-based monomer and the metathesis polymerization catalyst can be more firmly integrated.

Further, it is desirable to clean the coated surface in advance and remove dirt such as oil and dust. The joint according to the present invention is manufactured according to the present invention, and has a tubular joint body made of norbornene-based resin, and is provided on the inner peripheral surface of the opening on the opening side at one end of the joint body, and is made of hard vinyl chloride. And a receiving portion formed of a substantially tubular molded body made of resin. As described above, in the production method according to the present invention, a substantially tubular molded body made of a hard vinyl chloride resin is arranged in a portion that constitutes the internal receiving portion, and a polymerizable composition containing a norbornene-based monomer and a metathesis polymerization catalyst is provided. The composition is injected, polymerized and hardened, and the receiving portion formed of a substantially tubular molded body made of a hard vinyl chloride resin is integrated with the inner peripheral surface of the norbornene resin. Therefore, since the norbornene-based resin has excellent mechanical properties, it is possible to form a joint having excellent pressure resistance, heat resistance, and chemical resistance.

FIG. 2 is a vertical cross-sectional view showing an example of a method of using the joint according to the present invention to connect a tubular body to the joint. As shown in FIG. 2, the joint 6 obtained according to the invention
Has an opening 6a at one end, and a receiving portion 8 is provided on the side of the opening 6a. The receiving portion 8 is made of a substantially tubular molded body made of the hard vinyl chloride resin described above, and the other portions are made of norbornene-based resin. The receptacle portion 8 made of a substantially tubular molded body is firmly fixed by applying the primer to the joint body portion made of norbornene-based resin and then curing the polymerizable composition.

In use, the open tubular body 7 provided with the receptacle 8 is inserted and glued. The adhesive may be applied to the outer peripheral surface of the tubular body 7, the inner peripheral surface of the receiving portion 8 or the same side.

[0044]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail by describing specific examples of the present invention. The present invention is not limited to the examples below.

(Example 1) First, a chlorinated hard vinyl chloride resin pipe having a nominal diameter of 75 mm (manufactured by Sekisui Chemical Co., Ltd., trade name:
Two HT pipes each having a length of 64 mm were prepared. These two chlorinated rigid vinyl chloride resin pipes
It is placed in an oven at 0 ° C. for 180 seconds, softened by heating, expanded in diameter using a socket sleeve mold, and has a substantially tubular molded body having a dimension (mm) shown in FIG. I prepared. Next, the outer peripheral surface of this tubular molded body was sanded with No. 100 sandpaper and then cleaned with isopropyl alcohol. Further, the substantially tubular molded body treated as described above is placed in an inner mold made of two-piece tubular carbon steel, the temperature is adjusted to 40 ° C., and the pre-blended primer is added as described above. A brush was applied to the outer peripheral surface of the substantially tubular molded body. As a primer, a mixture of 50 parts by weight of methyl ethyl ketone, 100 parts by weight of dicyclopentadiene and 10 parts by weight of ethylidene norbornene is used.
A mixture of parts by weight was used.

Polymerizable composition: dicyclopentadiene 10
A mixture of 0 parts by weight and 10 parts by weight of ethylidene norbornene was used as a main agent, and as a metathesis polymerization catalyst (3,3-
Dimethylbutynylidene) bis (tricyclohexylphosphine) ruthenium dichloride is used, toluene 200
A solution prepared by dissolving 10 parts by weight of the polymerization catalyst in parts by weight was mixed so as to have a molar ratio of 1: 10,000 with respect to the main agent, and the mixture was stirred and prepared.

Next, after arranging the two split outer dies, the temperature of which was adjusted to 40 ° C., the above polymerizable composition was poured between the outer dies and the inner dies to fill the voids, and at 40 ° C. for 60 minutes. After the heat treatment, heat treatment was performed at 120 ° C. for 60 minutes to cure the polymerizable composition. Then, by demolding, a hard vinyl chloride resin / FRP composite pipe joint could be obtained.
The total working time was about 150 minutes.

Hydrostatic Test A chlorinated rigid vinyl chloride resin pipe was connected to the joint obtained as described above with an adhesive for a rigid vinyl chloride resin pipe (Sekisui Chemical Co., Ltd., trade name: Eslon No. 100), A water pressure test was conducted in hot water at 90 ° C. When the three joints were tested, the chlorinated rigid vinyl chloride resin pipe was broken and no abnormality was found in the joints and the connecting portions in any of them.

Cooling and Heat Repetition Test For the joint obtained as described above, the process of maintaining 120 ° C. for 120 minutes and 90 ° C. for 120 minutes is set as one cycle, and 2
A 0-cycle cold / heat repeating test was performed. Repeated cold and hot tests were performed on the three joints, but no interfacial peeling was observed in any of them.

Comparative Example 1 A joint was obtained in the same manner as in Example 1 except that the primer was not used, and evaluated in the same manner as in Example 1. In the water pressure test, in all of the three joints, the tubular molded body made of the hard vinyl chloride resin on the inner peripheral surface of the joint fell out, and it was not possible to withstand sufficient inner water pressure. Further, in the cold heat repeated test, interfacial debonding occurred in almost all areas in the three joints.

(Comparative Example 2) A joint was molded in the same manner as in Example 1 except for using a molded product made of a chlorinated hard vinyl chloride resin and a primer, and using only the polymerizable composition, and a water pressure test was conducted. As a result, the chlorinated hard vinyl chloride resin pipe connected to the joint was pulled out, and it was not possible to withstand sufficient internal water pressure.

The results of the above Examples and Comparative Examples 1 and 2 are summarized in Table 1 below.

[0053]

[Table 1]

[0054]

According to the manufacturing method of the present invention, a substantially tubular molded body made of a hard vinyl chloride resin is arranged in a portion forming a receiving portion in a die, and a space between the inner die and the outer die is provided. By a simple process of injecting a polymerizable composition containing a norbornene-based monomer and a metathesis polymerization catalyst, and polymerizing and curing the same, an inner peripheral surface of the norbornene-based resin is formed of a substantially tubular molded body made of a hard vinyl chloride resin. A joint with integrated mouth can be easily obtained. Therefore, rigid vinyl chloride resin / FRP using the conventional hand lay-up molding method
Compared to the method of manufacturing a joint made of a composite material, no skilled skill is required, so that a joint with excellent reliability can be obtained regardless of variations in the skill level of operators. Also,
The quality stability and productivity of the joint are dramatically improved, and the joint cost can be reduced.

Moreover, since the norbornene-based resin is the main component, it is possible to provide a joint having excellent chemical resistance and pressure resistance, and further, in the polymerization of the above-mentioned polymerizable composition, a substantially tubular molded product and a polymerizable compound are formed. Since a primer containing 10 to 90 parts by weight of a norbornene-based monomer and 90 to 10 parts by weight of a solvent that attacks the hard vinyl chloride resin is applied to the contact surface with the composition, a substantially tubular molded body made of the hard vinyl chloride resin is used. The configured receiving portion is firmly joined to the joint body made of norbornene resin. Therefore, it is possible to provide the joint of the present invention which is excellent in pressure resistance, chemical resistance, and cold-heat cyclic strength.

[Brief description of drawings]

FIG. 1 is a vertical sectional view for explaining an example of a method for manufacturing a joint of the present invention.

FIG. 2 is a vertical sectional view for explaining a pipe connecting operation using the joint of the present invention.

FIG. 3 is a vertical cross-sectional view showing a chlorinated rigid vinyl chloride resin pipe prepared for working a tubular molded body in Example 1.

[Explanation of symbols]

1 ... Outer mold 2 ... Internal type 3 ... Substantially tubular shaped body 4 ... Primer 5 ... Polymerizable composition 6 ... Joint 7 ... Hard vinyl chloride resin pipe 8 ... Receptacle

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shin Aoyagi             1 225, 225 Yanagishima, Chiyoda Town, Kanzaki District, Saga Prefecture             State Sekisui Industry Co., Ltd. F-term (reference) 4F204 AA12 AB04 AC05 AD05 AD12                       AG08 AH43 AH46 EA03 EA04                       EB01 EB11 EE22 EK13 EK17

Claims (2)

[Claims] 1. A method for manufacturing a tubular joint in which a tubular body is inserted from a receiving end side provided at one end opening, wherein a portion of the inner mold forming the receiving end is made of hard vinyl chloride resin. Arranging a substantially tubular shaped body consisting of, the norbornene-based monomer and the metathesis polymerization catalyst in the space between the substantially tubular shaped body and the outer die also serving as the inner mold or the inner mold in which the substantially tubular shaped body is arranged. A polymerizable composition containing the same is injected, and the polymerizable composition is polymerized and cured to form an integral part of the norbornene-based resin with a receiving portion formed of a substantially tubular molded body made of the hard vinyl chloride resin. In molding the modified joint, at least before polymerizing the polymerizable composition, 10 to 90 parts by weight of a norbornene-based monomer on the contact surface between the substantially tubular molded body and the polymerizable composition, and Solvent that attacks vinyl chloride resin Method for manufacturing a joint, characterized in that to keep applying a primer containing a 0-10 parts by weight. 2. A joint obtained by the manufacturing method according to claim 1, wherein the tubular joint body is made of norbornene-based resin, and is provided on an inner peripheral surface of the opening at an opening side of one end of the joint body. And a receiving portion formed of a substantially tubular molded body made of hard vinyl chloride resin.