JP2002265905A - Bonding method of dicyclopentadiene based resin molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bonding method of a dicyclopentadiene based resin molding which is possible to strongly bond without any particular pretreatment, and has good working efficiency. SOLUTION: The bonding method of a dicyclopentadiene based resin molding comprises bonding the resin moldings to each other, or the resin molding and the other bonding material to be bonded, using an acrylic adhesive having good affinity for the dicyclopentadiene based resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining a dicyclopentadiene resin molded article used for various molded articles, and more particularly, to a method for joining a dicyclopentadiene resin molded article by using a specific adhesive. The present invention relates to a method for joining a dicyclopentadiene-based resin molded article that can firmly join with a joined body and has good working efficiency.

[0002]

2. Description of the Related Art It has been known that a polymer can be obtained by subjecting a dicyclopentadiene-based monomer to a metathesis polymerization reaction. Among them, a method for obtaining a dicyclopentadiene-based resin molded product by performing polymerization and molding in a single step in a mold with a dicyclopentadiene-based monomer obtained at a low cost, such as dicyclopentadiene, using a metathesis polymerization catalyst. Has been proposed.

According to such a method, a large-sized molded product can be obtained using an inexpensive low-pressure mold. Further, the molded article of dicyclopentadiene obtained by this method has an excellent balance between rigidity and impact resistance, and can provide an attractive molded article.

However, since the dicyclopentadiene-based resin is a resin having a low polarity, there is a problem in adhesiveness with other materials, and various approaches have been made from the viewpoint of adhesion and lamination with other materials. .

For example, Japanese Patent Application Laid-Open No. 11-71554 discloses a method for bonding a norbornene-based resin molded product containing a dicyclopentadiene-based resin to another material in advance by using a ketone-based solvent or a ketone-based solvent. There is disclosed a method of improving adhesion by treating with a carboxylic acid ester-based solvent. In this method, contaminants on the surface such as uncured resin that adversely affect the adhesion are removed, thereby improving the adhesion to various adhesives and paints. However, according to this method, it is particularly troublesome to process a large molded product. Further, there is a problem that the working environment is deteriorated because the treatment is performed using the solvent.

As another method for increasing the bonding / painting strength of a dicyclopentadiene-based resin molded product, a method of curing after being molded in air for about one week after molding, and then performing bonding has been conventionally performed. However, this method has a disadvantage that productivity is extremely poor because bonding and painting cannot be performed immediately after molding. In addition, since the optimum curing period varies depending on weather conditions such as temperature and humidity, there is a problem that process management is difficult.

For these reasons, there has been a demand for a method for firmly joining a nodicyclopentadiene-based resin molded article and an object to be joined with high work efficiency.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and uses a specific adhesive to form a dicyclopentadiene resin without special pretreatment. It is an object of the present invention to provide a method for joining a dicyclopentadiene-based resin molded body that can firmly join bodies and has good working efficiency.

[0009]

According to the bonding method of the present invention, when a dicyclopentadiene-based resin molded article or a dicyclopentadiene-based resin molded article is joined to another object to be joined, an acrylic adhesive is used as an adhesive. Characterized by using an adhesive.

[0010] In the bonding method of the present invention, it is preferable that the bonding surface of the dicyclopentadiene-based resin molded product be in a rough surface state that gives a physical anchor effect to the adhesive.

The details of the joining method of the present invention will be described below.

First, the dicyclopentadiene-based resin described in the present invention is not particularly limited, and may be a dicyclopentadiene monomer alone, or a dicyclopentadiene monomer and a ring-opening copolymer of the dicyclopentadiene monomer. Examples of the resin include a resin obtained by subjecting one or more kinds of possible monomers to ring-opening metathesis polymerization using a metathesis polymerization complex.

Examples of other monomers capable of ring-opening copolymerization with the dicyclopentadiene monomer include norbornene monomers. Examples of such norbornene-based monomers include 2-rings such as 2-norbornene and norbornadiene, tricyclics such as dihydrodicyclopentadiene, tetracyclododecene, ethylidenetetracyclododecene, and phenyltetracyclododecene. Pentacyclics such as tetracyclics and tricyclopentadiene,
Hexacycles such as tetracyclopentadiene and their alkyl-substituted (eg, methyl, ethyl, propyl, butyl-substituted, etc.), alkylidene-substituted (eg, ethylidene-substituted), aryl-substituted (eg, phenyl, tolyl) Derivatives having a polar group such as an epoxy group, a methacryl group, a hydroxyl group, an amino group, a carboxyl group, a cyano group, a halogen group, an ether group, and an ester bond-containing group as well as a substituent.

Alkyl-substituted dicyclopentadiene (eg, methyl, ethyl, propyl, butyl, etc.), alkylidene-substituted (eg, ethylidene-substituted), aryl-substituted (eg, phenyl, tolyl-substituted) And derivatives having a polar group such as an epoxy group, a methacryl group, a hydroxyl group, an amino group, a carboxyl group, a cyano group, a halogen group, an ether group, and an ester bond-containing group. These monomers may be used alone or in combination of two or more.

Other examples of the other monomers capable of ring-opening copolymerization with a dicyclopentadiene monomer include monocyclic cycloolefins such as cyclobutene, cyclopentene, cyclopentadiene, cyclooctene and cyclododecene, indene, cumarone, and the like. A cyclic monomer having metathesis polymerization activity, such as a coumarone indene comonomer, may be used, and is preferably used. Other monomers capable of ring-opening copolymerization with these dicyclopentadiene-based monomers may be used alone,
Two or more kinds may be used in combination.

Examples of catalysts for ring-opening metathesis polymerization of dicyclopentadiene monomers include metal halides such as tungsten, molybdenum, tantalum, ruthenium, rhenium, osmium and titanium, oxyhalides, oxides and organic ammonium salts. And are preferably used. These metathesis polymer complexes may be used alone or in combination of two or more.

When the ring-opening metathesis polymerization of the dicyclopentadiene-based monomer must be carried out in the air as a process, or when an uncured layer is formed on the surface of the molded product so as to prevent adhesion, the above-mentioned metathesis polymer complex is used. Among them, it is preferable to select a catalyst having excellent stability over time in air. Specifically, a ruthenium carbene catalyst represented by the following general formula [I] and a ruthenium vinylidene catalyst represented by the general formula [II] are preferably used. These ruthenium carbene catalysts and ruthenium vinylidene catalysts may be used alone or in combination of two or more.

[0018]

Embedded image

In the above general formulas [I] and [II],
R1 and R2 independently of one another, hydrogen, C2-C20-
Alkenyl, C1-C20-alkyl, aryl, C1
-C20-carboxylate, C1-C20-alkoxy, C2-C20-alkenyloxy, aryloxy, C2-C20-alkoxycarbonyl, C1-C2
0 alkylthio, alkylsilyl, annealed silyl, oxyanneal, oxyalkyl, thioalkyl, thioaryl (these are C1-C5-alkyl, halogen,
It may be substituted by C1-C5-alkoxy, or C1-C5-alkyl, halogen, C1-C5
Optionally substituted by phenyl substituted by C5-alkoxy), means a ferrocene derivative, X1 and X2 independently of one another, mean any desired anionic ligand, L1 And L2, independently of one another, mean any desired neutral electron donor. Then, two or three of X1, X2, L1 and L2
The individuals may together form a multidentate chelating ligand.

A more preferred structure of the catalyst is represented by the general formula [I]
And in general formula [II], wherein R1 and R2 are
Independently of each other hydrogen, methyl, ethyl, phenyl, ferrocenyl or vinyl optionally substituted by methyl, ethyl, phenyl or ferrocenyl, X1 and X2 independently of each other, Cl, Br; And L2 are, independently of one another, a ruthenium carbene catalyst or a ruthenium vinylidene catalyst, which is trimethylphosphine, triethylphosphine, triisopropylphosphine, triphenylphosphine or tricyclohexylphosphine.

The amount of the metathesis polymer complex used in the ring-opening metathesis polymerization of the dicyclopentadiene monomer depends on the activity of the metathesis polymer complex.
Although it cannot be said unambiguously, 1/5 to 1
/ 500,000 molar equivalents. If the amount of the metathesis polymer complex relative to all monomers is more than 1/5 molar equivalent, the molecular weight of the obtained resin will not be sufficiently increased, and 1
If it is less than / 500,000 molar equivalents, the polymerization rate will be low.

The dicyclopentadiene-based resin may further include a filler, a reinforcing material, an antioxidant (an antioxidant), a foaming agent, a defoaming agent, if necessary, as long as the achievement of the object of the present invention is not hindered. One or two of various additives such as a thixotropic agent, an antistatic agent, a molecular weight modifier, a polymer modifier, a flame retardant, a softener, a plasticizer, a surfactant, and an elastomer.
Seeds or more may be added. In addition, coloring with a dye, a pigment, a coloring agent, or the like may be performed, or a material having a design such as a stone grain or a wood grain by any method may be provided.

The dicyclopentadiene-based resin has sufficient strength, rigidity, heat resistance, etc., even when used alone, but in particular, high strength, high rigidity, high heat resistance, etc. are required. In use, physical properties can be further enhanced by compounding with inorganic fillers and reinforcing fibers.

Since the dicyclopentadiene-based resin composited with the inorganic filler and the reinforcing fiber has high rigidity, it is not only effective in strength design in applications requiring rigidity, but also has a low coefficient of linear expansion. Therefore, it is also preferable in terms of dimensional stability of the dicyclopentadiene-based resin 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, thermally expandable vinylidene chloride particles, etc. And are preferably used. Among them, calcium carbonate, fly ash, and aluminum hydroxide are particularly preferred because of good cost and good physical properties of the molded article. Dicyclopentadiene-based resin filled with aluminum hydroxide becomes flame-retardant. In addition, a dicyclopentadiene-based resin filled with a glass balloon or a silica balloon has good heat insulating properties. These fillers may be used alone or 2
More than one species may be used in combination. Further, if necessary, it can be used after being subjected to a surface treatment with a coupling agent, a surface treatment agent or the like.

Examples of the reinforcing material include fibers such as glass fiber, carbon fiber, and aramid fiber, and are preferably used. The form of these fibers is not particularly limited, and may be either short fibers or long fibers, or may be processed into a cloth, mat, nonwoven, or the like. These fibers may be used alone or in combination of two or more. Further, if necessary, it can be used after being subjected to a surface treatment with a coupling agent, a surface treatment agent or the like.

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

In the present invention, the other object to be joined to the dicyclopentadiene-based resin molded article broadly includes a molded article molded in any shape. The type of material used for the molded body is not particularly limited, and any material such as an organic material, a metal material, and an inorganic material can be used.

Examples of the organic material include a resin material. Specifically, polyethylene, polypropylene,
Polyvinyl chloride, polyvinylidene chloride, vinyl acetate resin, polyvinyl formal, polyvinyl butyral, polyvinyl acetal, ethylene-vinyl acetate copolymer,
Polystyrene, acrylonitrile-styrene copolymer,
Acrylonitrile-butadiene-styrene copolymer, acrylonitrile-acryl-styrene copolymer (AAS
Resin), acrylonitrile- (ethylene-propylene-
Diene copolymer) -styrene copolymer (AES resin),
Polymethyl methacrylate, nylon, polyacetal,
Polycarbonate, polyethylene terephthalate, fluorine resin, polyphenylene ether, polyphenylene sulfide, polyphenylene oxide, polyether ether ketone, polyamide, thermoplastic resin such as thermoplastic polyimide, or phenol resin, urea resin, melamine resin, unsaturated polyester, vinyl ester, A thermosetting resin such as an epoxy resin, a silicon resin, a polyurethane, a phenol resin, and a thermosetting polyimide, and a norbornene-based resin may be used. These resins may be used alone or in combination of two or more.

These resin materials may contain fillers, reinforcing materials, antioxidants (anti-aging agents), foaming agents, defoamers, thixotropic agents, if necessary, as long as they do not impair the achievement of the object of the present invention. One or more of various additives such as antistatic agents, molecular weight modifiers, polymer modifiers, flame retardants, softeners, plasticizers, pigments, dyes, colorants, elastomers, etc. are added. You may.

As the filler, calcium carbonate, aluminum hydroxide, magnesium carbonate, sodium hydrogen carbonate, clay, talc, mica, silica, kaolin, fly ash, montmorillonite, glass balloon, silica balloon, thermally expandable vinylidene chloride particles and the like And are preferably used. These fillers may be used alone or in combination of two or more.

Examples of the reinforcing material include, for example, fibers such as glass fiber, carbon fiber, aramid fiber, polyethylene terephthalate fiber, and steel fiber, and are preferably used. These reinforcing agents may be used alone,
Two or more kinds may be used in combination.

The shape of the fibrous reinforcing material is not particularly limited, and may be filament-like long fibers or short fibers. These fibers may be processed into a cloth, sheet, or mat-shaped nonwoven fabric. Further, these may be used in combination.

As the metal material, not only iron, stainless steel, aluminum and copper but also any metal material can be used. As the inorganic material, not only glass, cement, mortar, and concrete but also any inorganic material can be used.

The shape of the dicyclopentadiene resin molded article to be joined in the present invention is not particularly limited, and may be a simple shape such as a film, a plate, a rod, or a tube, or any shape by various molding methods. It may be formed.

The joining method of the present invention will be described in more detail.

The joining method of the present invention uses an acrylic adhesive as an adhesive when joining the dicyclopentadiene-based resin molded articles or between the dicyclopentadiene-based resin molded article and another object to be joined. Features.

Since the acrylic adhesive has a good affinity with the dicyclopentadiene resin, it does not need to be subjected to a special pretreatment such as a primer treatment of the bonding surface of the dicyclopentadiene resin molded article or a long-term outdoor exposure. However, the dicyclopentadiene-based resin molded article can be firmly joined. In addition, the joining operation can be performed efficiently.

The acrylic adhesive used in the present invention is a general term for an adhesive containing acrylic acid and its derivatives.

Such an acrylic adhesive may be any of a chemical reaction type, a solvent volatile type, a hot melt type, a pressure sensitive type, and a re-wet type. The chemical reaction type is more preferable in terms of heat resistance, chemical resistance, and durability.

As the chemically reactive acrylic adhesive, a curing agent-added acrylic adhesive which cures by adding a curing agent, an anaerobic acrylic adhesive which cures when oxygen is cut off, or in air There is a cyanoacrylate-based acrylic adhesive in which a chemical reaction occurs due to moisture, but a curing agent-curable acrylic adhesive is more preferable from the viewpoint of bonding strength and convenience in handling.

Further, a curing agent-curable acrylic adhesive is preferable because the strength is hardly reduced even when the adhesive layer becomes thick. Further, since the curing agent-curable acrylic adhesive has high heat resistance, the dicyclopentadiene-based resin molded product bonded by the bonding method according to the present invention can be used even at a high temperature. Therefore, it can be said that the adhesive can exhibit the characteristics of high strength and high elasticity at high temperatures, which are the characteristics of the dicyclopentadiene resin.

The reactive acrylic monomer contained in the curing agent-added type acrylic adhesive is not particularly limited, but may be methyl acrylate, ethyl acrylate, isobutyl acrylate, hexyl ethyl acrylate, methacrylic acid. Examples thereof include lower acrylic esters of acrylic acid and methacrylic acid represented by methyl acrylate and ethyl methacrylate, and dimethyl esters of ethylene glycol and butylene glycol.

The curing agent is also not particularly limited, and may be any known radical initiator. By way of example, mention may be made of benzoyl peroxide, cumene hydroperoxide, acetyl peroxide, tert-butyl hydroperoxide, lauroyl peroxide, methyl ethyl ketone peroxide.

As the activator, an organic salt of a transition metal: for example, cobalt naphthenate, nickel naphthenate, manganese naphthenate, iron naphthenate, copper octenoate, iron hexanoate, iron propionate, or an amine Compound: For example, N, N-dimethylaniline, N, N-
Dimethyl toluidine, N, N-diethylaniline, N,
N-diisopropyl (p-toluidine) and guanidine can be mentioned as examples.

The acrylic adhesive as described above may be, if necessary, a reactive compound other than an acrylic monomer, a filler, a reinforcing material, an antioxidant (antioxidant) as long as the object of the present invention is not hindered. , Foaming agent, antifoaming agent, thixotropic agent,
One of various additives such as antistatic agent, molecular weight modifier, polymer modifier, flame retardant, softener, plasticizer, organic solvent, surfactant, coupling agent, elastomer, paraffin, etc.
Seeds or two or more kinds may be added.

The acrylic adhesive may be a one-part type, a two-part type in which a main agent and a curing agent are mixed, or a multi-part type in which two or more parts are mixed, depending on the intended use. The most suitable one may be used.

As a method of applying the adhesive in the present invention, it is not necessary to take a special method, and a generally known bonding method may be used. Specifically, after preliminarily mixing the main agent and the curing agent, an adhesive is applied to at least one of the bonding surfaces of the dicyclopentadiene-based resin molded article and the bonded body,
A method in which both surfaces are bonded together, or a main agent and a curing agent are separately applied to the bonded surface of the dicyclopentadiene-based resin molded body and the object to be bonded separately, and both surfaces are bonded and rubbed. By doing so, there can be mentioned a method in which the main agent and the curing agent are mixed and joined.

The time from the application of the adhesive to the bonding is not particularly limited, and may be appropriately determined from the pot life of the adhesive to be used. The time for curing the adhesive is not particularly limited, and may be appropriately determined based on the strength development time of the adhesive to be used and the strength required for the intended use. The thickness of the adhesive layer is not particularly limited.

According to the joining method of the present invention, the dicyclopentadiene-based resin molded articles or the dicyclopentadiene-based resin molded article and the article to be joined are firmly joined without any special pretreatment on the bonding surface. However, if necessary, pretreatment such as primer treatment or sanding may be performed.

Acrylic adhesives generally have the ability to dissolve and absorb oil and some water remaining on the surface of the adherend, so that the acrylic monomer blended in the system has an epoxy or urethane adhesive. It is also preferable from the viewpoint that the adhesive strength is stable as compared with the agent.

In the bonding method according to the present invention, it is preferable that the bonding surface of the dicyclopentadiene-based resin molded article be in a roughened state that gives a physical anchor effect to the adhesive. In this case, the acrylic resin penetrates into the rough surface provided on the bonding surface, so that the bonding can be performed more firmly.

In the present invention, the term "rough surface" refers to a surface having such a degree that physical adhesion can be exhibited by an anchor effect. The roughness of the rough surface is not particularly limited.

As a method of providing a rough surface, for example, a method of embossing, sanding, needle-forming, sandblasting, or the like on the bonding surface of a dicyclopentadiene-based resin molded article or an object to be joined may be used. .

The position where the rough surface is provided may be the entire bonding surface or a part of the bonding surface. Among them, the strength required for the use of the dicyclopentadiene resin molded article is preferable. It may be appropriately selected based on the workability and workability.

When joining a dicyclopentadiene resin molded article to another object to be joined, the bonding surface of the other object to be joined does not have to be roughened, but a stronger joining state is required. Is preferably roughened. <Operation> According to the bonding method of the present invention, since an acrylic adhesive having a good affinity for the dicyclopentadiene-based resin is used, primer treatment of the bonding surface of the dicyclopentadiene-based resin molded product or long-term The dicyclopentadiene-based resin molded article can be firmly joined without special pretreatment such as leaving outdoors. Moreover, work efficiency is good.

In the bonding method of the present invention, if the bonding surface of the dicyclopentadiene-based resin molded body is set to a rough surface having a physical anchor effect on the adhesive, the acrylic resin is provided on the bonding surface. Since it penetrates into the rough surface, it can be joined more firmly.

[0058]

EXAMPLES <Example 1> [Dicyclopentadiene-based resin] Dicyclopentadiene-based monomer: mixture of 100 parts by weight of dicyclopentadiene and 10 parts by weight of ethylidene norbornene Metathesis polymerization catalyst: represented by the following structural formula [III] (3,3-Dimethylbutynylidene) bis (tricyclohexylphosphine) ruthenium dichloride [Acrylic adhesive] Company name: ITW Industry Co., Ltd. Product name: MA-310 [Material] ・ Hard chloride Vinyl resin flat plate: 4 mm thick (sanding treated with No. 180 sandpaper)-Hard vinyl chloride resin flat plate: 4 mm thick (no sanding treatment)-Aluminum flat plate: 4 mm thick (sanding treated with 180 sandpaper)

[0059]

Embedded image

As the dicyclopentadiene-based monomer,
Using a mixture of 100 parts by weight of dicyclopentadiene and 10 parts by weight of ethylidene norbornene, dissolve 10 parts of (3,3-dimethylbutynylidene) bis (tricyclohexylphosphine) ruthenium dichloride of the structural formula [III] in 200 parts of toluene. The solution thus obtained is added so that the molar ratio of (3,3-dimethylbutynylidene) bis (tricyclohexylphosphine) ruthenium dichloride to the dicyclopentadiene-based monomer is 1/10000, and the mixture is mixed and stirred at 25 ° C. A resin composition was prepared.

The prepared resin composition was cast into a casting mold (4 m thick).
m, two glass plates facing each other with a spacer of 4 mm in thickness) and heated at 100 ° C. for 60 minutes to produce a 4 mm-thick dicyclopentadiene resin flat plate.

The thus prepared flat plate of dicyclopentadiene resin and the above three kinds of bonded bodies were cut into strips each having a size of 100 mm × 25 mm. The above-mentioned acrylic adhesive in which a main agent and a curing agent are mixed in advance is applied to a dicyclopentadiene resin flat plate and an object to be joined, and the two are bonded together to form a joint strength measurement sample shown in FIG. 1 (a sample for each object to be joined). ) Was prepared. After each sample was cured at room temperature for 24 hours, a tensile shear bond strength test was performed based on JIS K6850. The results are shown in Table 1 below.

In Example 1, when the object to be joined was a hard vinyl chloride resin flat plate subjected to sanding, the hard vinyl chloride resin flat plate broke in all five pieces. Even in the case of the hard vinyl chloride resin flat plate not subjected to the sanding treatment, the hard vinyl chloride resin flat plate broke in four out of five. When the joined body was an aluminum flat plate, the dicyclopentadiene resin flat plate broke in all five.

<Example 2> [Dicyclopentadiene-based resin] Same as in Example 1 [Acrylic adhesive] Company name: Sekisui Chemical Co., Ltd. Product name: Adhesive No. for aluminum plating 350 [Substrate] Same as Example 1 After producing a dicyclopentadiene resin flat plate in the same manner as in Example 1, the dicyclopentadiene resin flat plate was
Each of the three types of objects to be joined is 100 mm × 25
It was cut into strips of mm. The main agent of the acrylic adhesive is applied to the dicyclopentadiene resin flat plate side, the hardener of the acrylic adhesive is applied to the joined body side, and the main agent and the hardener are mixed by bonding and rubbing well. Then, a bonding strength measurement sample (a sample for each bonded body) of FIG. 1 was prepared. After each sample was cured at room temperature for 24 hours, a tensile shear adhesive strength test was performed based on JIS K6850. The results are shown in Table 1 below.

In the second embodiment, when the object to be bonded is a hard polyvinyl chloride resin plate subjected to a sanding process,
In all of the books, the rigid vinyl chloride resin plate broke. When the joined body was an aluminum flat plate, the dicyclopentadiene resin flat plate broke in all five.

<Comparative Example 1> [Dicyclopentadiene-based resin] Same as in Example 1 [Adhesive] Company name: Hitachi Chemical Polymer Co., Ltd. Product name: Urethane-based adhesive Hibon 4603 [Workpiece]-Hard vinyl chloride Resin flat plate: thickness 4 mm (sanding treatment with sandpaper No. 180) Aluminum flat plate: thickness 4 mm (sanding treatment with sandpaper No. 180) After preparing a dicyclopentadiene resin flat plate in the same manner as in Example 1. , The dicyclopentadiene resin flat plate,
Each of the three types of objects to be joined is 100 mm × 25
It was cut into strips of mm. The urethane-based adhesive was applied to a dicyclopentadiene resin flat plate and a member to be joined, and the two were bonded together to prepare a joint strength measurement sample (a sample for each member to be joined) in FIG. After each sample was cured at room temperature for 24 hours, a tensile shear bond strength test was performed based on JIS K6850. The results are shown in Table 1 below.

In Comparative Example 1, the bonding interface was peeled off in all the samples, regardless of whether the object to be bonded was a hard vinyl chloride resin flat plate or an aluminum flat plate. <Comparative Example 2> [Dicyclopentadiene-based resin] Same as in Example 1 [Adhesive] Company name: Hitachi Chemical Co., Ltd. Product name: Chloroprene-based adhesive Hibon 1920 [Joint] Same as Comparative Example 1 Example After preparing a dicyclopentadiene resin flat plate in the same manner as in 1, the dicyclopentadiene resin flat plate is
Each of the three types of objects to be joined is 100 mm × 25
It was cut into strips of mm. The above-mentioned chloroprene-based adhesive was applied to a dicyclopentadiene resin flat plate and an object to be joined, and both were adhered to each other to produce a joint strength measurement sample (a sample for each object to be joined) in FIG. After each sample was cured at room temperature for 24 hours, a tensile shear bond strength test was performed based on JIS K6850. Table 1 shows the results.

In Comparative Example 2, the adhesive interface was peeled off in all the samples, regardless of whether the joined body was a hard vinyl chloride resin flat plate or an aluminum flat plate.

[0069]

[Table 1]

As is clear from the results shown in Table 1, according to the bonding method of the present invention, it is found that the dicyclopentadiene resin molded article can be firmly bonded by using the acrylic adhesive. In addition, it can be seen that the bonding strength is improved by performing the surface treatment (sanding processing) on the bonding surface.

[0071]

As described above, according to the joining method of the present invention, when the dicyclopentadiene-based resin molded articles are bonded to each other or when the dicyclopentadiene-based resin molded article is adhered to another article to be joined, acrylic resin is used. Since a system adhesive is used,
Strong bonding can be performed without performing any special pretreatment such as primer treatment or standing outdoors for a long period of time. Moreover, work efficiency is good.

[Brief description of the drawings]

FIG. 1 is a side view (A) and a plan view (B) showing test pieces produced in Examples and Comparative Examples of the present invention.

Claims (2)

[Claims] 1. A dicyclopentadiene-based resin molded article, or a dicyclopentadiene-based resin molded article and another object to be joined, wherein an acrylic adhesive is used as an adhesive. A method for joining a pentadiene resin molded article. 2. The dicyclopentadiene-based resin molding according to claim 1, wherein the bonding surface of the dicyclopentadiene-based resin molded product is made to have a rough surface that provides a physical anchor effect to the adhesive. How to join the body.