JP2003276403A - Fractionally collectable rubber wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber wheel manufactured with integral vulcanization molding, allowing easy fractional collection of a shaft member and a rubber body by heating it to a temperature higher than a vulcanizing temperature during integral vulcanization molding after used while maintaining sufficiently high adhesive force to make an adhesive layer softened and melted. <P>SOLUTION: At least the adhesive layer 18 of an epoxy resin adhesive capable of being softened or melted by heating after hardening and adhesion is formed on the outer periphery face of the metal or resin shaft member 14. The rubber wheel 12 comprising the shaft member 14 and the circular or cylindrical rubber body 16 is manufactured with integral vulcanization molding. <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 rubber wheel that can be separately collected, and more particularly, in a rubber wheel manufactured by integral vulcanization molding, after its use, the temperature is higher than the vulcanization temperature at the time of integral vulcanization molding. The present invention relates to a rubber wheel capable of separately collecting a shaft member and a rubber body by heating to soften / melt the adhesive layer.

[0002]

BACKGROUND ART Conventionally, an annular or cylindrical rubber body having excellent elasticity and cushioning properties has been integrally formed on the outer peripheral surface of a shaft member having rigidity such as metal or resin. The rubber wheel adhered to the, for example, as a caster for facilitating the movement of industrial trolleys, furniture, chairs, etc., is attached to the lower part of those industrial trolleys, furniture, chairs, etc. Has been done.

Specifically, such a rubber wheel has a structure shown in FIG. 1 in a sectional form,
After the undercoating adhesive and the topcoating adhesive, which are vulcanizing adhesives for rubber, are applied to the outer peripheral surface of the shaft member 2,
While the unvulcanized annular or cylindrical rubber body 4 is molded on the adhesive surface coated with such an adhesive, the unvulcanized rubber body 4 is vulcanized, and at the same time, the adhesive is applied. Are vulcanized and cured, and the rubber member 4 is vulcanized and adhered to the shaft member 2, whereby the shaft member 2 and the rubber member 4 are
It is firmly adhered through the undercoat / topcoat adhesive layers 6 and 8 to be integrally formed.

By the way, in recent years, from the viewpoint of environmental protection, recycling and reuse of resources have been demanded, and even the rubber wheel 10 has a member and a member used after its use is finished. Material recycling and reuse is beginning to be required. However, as described above, the rubber wheel 1 manufactured by integral vulcanization molding
0 indicates that the shaft member 2 and the rubber body 4 forming the shaft member 2 are extremely strongly adhered by the thermosetting vulcanizing adhesive layers 6 and 8. It was extremely difficult to separate and collect the rubber body 4 and the rubber body 4.

Under such circumstances, in order to realize such a separate collection of the shaft member 2 and the rubber body 4 in the rubber wheel 10,
To replace an existing thermosetting adhesive with an adhesive composed of a thermoplastic resin (thermoplastic adhesive) and heat and melt the thermoplastic adhesive layer after the original use as a rubber wheel. It is conceivable that the shaft member 2 and the rubber body 4 are separated from each other and recovered as respective members, but the thermoplastic adhesive is generally inferior in heat resistance and the vulcanization temperature of the rubber (about 150 ° C.). In the above), since it is softened / melted and fluidized,
It cannot be used for integral vulcanization molding, and even if the vulcanized rubber body 4 and the shaft member 2 are bonded together with a thermoplastic adhesive, the number of steps in the manufacturing process increases. In addition, there is an inherent problem that the same adhesive strength as when a vulcanizing adhesive for rubber is used cannot be secured.

[0006]

The present invention has been made in view of such circumstances, and a problem to be solved by the present invention is that a rubber wheel manufactured by integral vulcanization has sufficiently high adhesion. After its use while securing power,
By heating to a temperature higher than the vulcanization temperature at the time of integral vulcanization molding to soften / melt the adhesive layer, it is possible to easily separate and collect the shaft member and the rubber body. To provide.

[0007]

The present invention has been made to solve the above problems, and its gist is to provide an adhesive layer on the outer peripheral surface of a metal or resin shaft member. To form a rubber wheel formed by integrally vulcanizing an annular or cylindrical rubber body, and at least the portion of the adhesive layer on the side in contact with the outer peripheral surface of the shaft member after curing / bonding A rubber wheel capable of being separated and collected, which is characterized in that it is formed by using an epoxy resin adhesive which can be softened / melted by heating.

That is, in such a rubber wheel according to the present invention, a portion of the adhesive layer interposed between the shaft member and the rubber body at least on the side in contact with the outer peripheral surface of the shaft member is a specific epoxy resin. Since it is formed of a system adhesive, that is, an epoxy resin adhesive that can be softened / melted by heating after curing / adhesion, the epoxy resin adhesive melts during integral vulcanization molding. It does not flow out at all, and the curing reaction proceeds, firmly adhering the shaft member and the rubber body, and the adhesive force similar to that of the conventional thermosetting vulcanizing adhesive can be advantageously secured. At the same time, by heating to a temperature higher than the vulcanization temperature at the time of integral vulcanization molding, the part of the adhesive layer made of such an epoxy resin adhesive is softened or melted, and at that part, the shaft member and the go Is the that separates the body easily adapted to be. Therefore, in the rubber wheel of the present invention, the shaft member and the rubber body can be separated and collected very easily when the rubber wheel is discarded due to abrasion of the surface of the rubber body.

By the way, according to one of the preferable embodiments of the rubber wheel which can be separately collected according to the present invention, the epoxy resin adhesive has an average number of epoxy groups of 1.5 to 2.
It is desirable that the epoxy resin composition is constituted by including two epoxy resins and a curing agent having two functional groups capable of reacting with epoxy groups. By employing such an epoxy resin adhesive, The object of the invention can be achieved extremely advantageously.

According to another preferred embodiment of the present invention, the adhesive layer is composed of a plurality of layers, and the layer of the plurality of layers which is in contact with the outer peripheral surface of the shaft member is the epoxy. It is desirable that the layer on the side in contact with the rubber body is formed of a vulcanizing adhesive while being formed of a resin adhesive. If such a configuration is adopted, the shaft member and the rubber body made of different materials can be bonded to each other with a further excellent bonding force.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, in order to more specifically clarify the present invention, embodiments of the present invention will be described in detail with reference to the drawings.

First, FIG. 2 shows a specific example of the rubber wheel according to the present invention as described above in the form of a vertical cross section orthogonal to the axial direction, in which the rubber wheel 12 is It is manufactured by integral vulcanization molding, and is provided coaxially so as to cover the outer peripheral surface of the cylindrical shaft member 14 made of a material having rigidity such as a metal material such as iron or a resin material. Thick cylindrical rubber body 16
And is configured. Also, those shaft members 14
A plurality of (here, three) adhesive layers 18, 20, 22 are formed between the outer peripheral surface of the rubber body 16 and the inner peripheral surface of the rubber body 16. However, it should be understood that in FIG. 2, the thicknesses of the adhesive layers 18, 20, and 22 are exaggerated and are shown in a larger ratio than they actually are so that the adhesive layers 18, 20, and 22 can be easily understood. Is.

The rubber wheel 12 having such a structure
In the case of manufacturing by integral vulcanization molding, first, a predetermined adhesive is sequentially applied to the outer peripheral surface of the shaft member 14 to thereby form a plurality of adhesive layers 18, 20, 22.
Are laminated, and thereafter, the rubber body 16 made of the unvulcanized rubber composition is coaxially molded with respect to the shaft member 14 subjected to such an adhesion treatment. By vulcanizing the vulcanized rubber body 16, the rubber body 16 is vulcanized and molded, and at the same time, the adhesive layers 18, 2
0 and 22 are cured, and the rubber body 16 and the shaft member 14 are vulcanized and adhered to each other, whereby the target rubber wheel 1
2 is integrally formed.

Here, such an exemplary rubber wheel 12 is used.
In that case, of the three adhesive layers interposed between the shaft member 14 and the rubber body 16, the innermost adhesive layer 18 in contact with the outer peripheral surface of the shaft member 14 is heated by curing and bonding. It is formed of an epoxy resin-based adhesive that can be softened / melted, and it has a great feature.

That is, epoxy resin adhesives are generally classified into thermosetting adhesives, as is well known, and usually, a curing agent is reacted with an epoxy resin which is a main component to cure the epoxy resin. By doing so, an insoluble and infusible resin having a three-dimensional network structure is formed.However, in the epoxy resin adhesive used in this example, the linear polymer structure mainly causes Also in the above, like the thermoplastic resin, it has a characteristic that it can be softened or melted by being heated to a predetermined temperature.

More specifically, the epoxy resin adhesive used in this example is disclosed in JP-A-2001-3484.
No. 19, which is composed of the same components as the epoxy resin composition and has an average number of epoxy groups of 1.5 to 2.2 epoxy resin (component A),
A curing agent having two functional groups capable of reacting with an epoxy group (B
Component) at least, and by reacting such a specific A component and B component, formation of a usual strong network structure, that is, cross-linking is suppressed, The polymer in the shape of a circle is effectively generated, and thereby the curing and adhesive action is realized. Therefore, at the time of applying such an epoxy resin adhesive, workability similar to that of a conventional thermosetting adhesive can be obtained, and the cured adhesive is heated to a predetermined temperature so that the rigidity of the molecular chain can be improved. Is weakened so that it can be easily softened / melted. Moreover, such an epoxy resin-based adhesive has excellent adhesive strength and heat resistance as compared with conventionally known thermoplastic adhesives, and the softening or melting temperature of the epoxy resin-based adhesive is also different from that of the rubber body 16. The sulfurization temperature is generally sufficiently higher than about 150 ° C to 170 ° C.

By the way, as the component A constituting the above-mentioned epoxy resin adhesive, it is advantageous that the average value of the number of functional groups (epoxy groups) in the molecule is 1.5 to 2.2. Desirably, an epoxy resin of 1.8 to 2.0 is adopted, but in order to realize such an average number of functional groups, a bifunctional epoxy resin is used as a main component (50% by weight or more, preferably Is 80% or more), it does not matter if a trifunctional or higher functional epoxy resin and a monofunctional reactive diluent are contained.
If the average number of epoxies is less than 1.5, the adhesive layer 18 cannot have sufficient heat resistance, abrasion resistance, impact resistance and the like, while 2.2 If it exceeds, even if it is heated to a predetermined temperature, it becomes difficult for the adhesive layer 18 to soften or melt.

Specifically, as the bifunctional epoxy resin, for example, bisphenol A type epoxy resin, bisphenol F type epoxy resin, bifunctional phenol novolac type epoxy resin, bisphenol AD type epoxy resin, biphenyl type epoxy resin, 2 Functional naphthalene type epoxy resin, bifunctional alicyclic epoxy resin, bifunctional glycidyl ester type epoxy resin (for example, diglycidyl phthalate, diglycidyl tetrahydrophthalate, dimer acid diglycidyl ester, etc.), bifunctional glycidyl amine type Epoxy resin (eg, diglycidyl aniline, diglycidyl toluidine, etc.), bifunctional heterocyclic epoxy resin, bifunctional diarylsulfone type epoxy resin, hydroquinone type epoxy resin (eg, hydroquinone diglycidyl) Ether, 2,5-di -tert
-Butylhydroquinone diglycidyl ether, resorcin diglycidyl ether, etc.) Bifunctional alkylene glycidyl ether compound (eg, butanediol diglycidyl ether, butenediol diglycidyl ether, butynediol diglycidyl ether), bifunctional glycidyl group Containing hydantoin compounds (eg 1,
3-diglycidyl-5,5-dialkylhydantoin,
1-glycidyl-3- (glycidoxyalkyl) -5,
5-dialkylhydantoin, etc.), a bifunctional glycidyl group-containing siloxane (for example, 1,3-bis (3-glycidoxypropyl) -1,1,3,3-tetramethyldisiloxane, α, β-bis ( 3-glycidoxypropyl)
Examples thereof include polydimethylsiloxane) and modified products thereof.

As the trifunctional or higher functional epoxy resin, for example, a trifunctional or higher functional phenol novolac type epoxy resin, a trifunctional or higher functional alicyclic epoxy resin, a trifunctional or higher functional glycidyl ester type epoxy resin, a trifunctional or higher functional Glycidyl amine type epoxy resin (eg, tetraglycidyl diaminodiphenylmethane, triglycidyl-p
-Aminophenylmethane, triglycidyl-m-aminophenylmethane, tetraglycidyl-m-xylylenediamine, etc.) Trifunctional or higher heterocyclic epoxy resin, trifunctional or higher diarylsulfone type epoxy resin, trifunctional or higher alkylene Glycidyl ether compounds (for example,
Glycerin triglycidyl ether, trimethylolpropane triglycidyl ether, pentaerythritol tetraglycidyl ether, etc.), trifunctional or higher functional glycidyl group-containing hydantoin compound, trifunctional or higher functional glycidyl group-containing siloxane, and modified products thereof Can be done.

Further, as the monofunctional reactive diluent,
For example, tert-butyl phenyl glycidyl ether, 2-ethylhexyl glycidyl ether, allyl glycidyl ether, phenyl glycidyl ether, 3-
Glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 1- (3-glycidoxypropyl) 1,1,3,3,3-pentamethyldisiloxane, N-glycidyl-N, N -Bis [3-
Examples thereof include monoglycidyl compounds such as (trimethoxysilyl) propyl] amine and monoalicyclic epoxy compounds such as 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane.

On the other hand, the B component, which is an essential component of the epoxy resin adhesive, may be an amine compound, a phenol compound or a thiol compound having two functional groups capable of reacting with the epoxy group. Among them, the molecular weight is 50 to 1000, preferably 100 to 5
00, which is liquid or semi-solid at room temperature,
desirable.

More specifically, the amine compound is preferably liquid at room temperature, and examples thereof include piperazine, dodecylamine, benzylamine and dimethylaminopropylamine. Further, the phenolic compound is preferably one having a low viscosity when melted, a low crystallinity, and not crystallized when dissolved in the component A, for example, a benzene ring such as catechol, resorcin, hydroquinone Mononuclear aromatic dihydroxy compounds, bis (4-hydroxyphenyl) propane (bisphenol A), bis (4-hydroxyphenyl) methane (bisphenol F), bis (4-hydroxyphenyl) ethane (bisphenol A)
Examples thereof include bisphenols such as D), compounds having a condensed ring such as dihydroxynaphthalene, diarylresorcin, diallylbisphenol A, bifunctional phenol compounds having an allyl group introduced such as triallyldihydroxybiphenyl, and dibutylbisphenol A. . Further, the thiol compound is preferably liquid at room temperature, and examples thereof include ethylene glycol bisthioglycolate and ethylene glycol bisthiopropionate. It should be noted that these compounds may be used alone or in combination of two or more kinds without any problem.

Further, the above-mentioned B component has a good softening /
In order to secure meltability and heat resistance, B component: 0.8 to 1.2 equivalents, more preferably 0.
It is preferably used in a ratio of 9 to 1.1 equivalents.

Further, the epoxy resin adhesive composed of the components A and B as described above may further include a thermoplastic resin (for improving impact resistance and softening / melting property) if necessary. C component), a filler (D component) for improving the compressive strength and low thermal expansion, and further, a curing accelerator and a silane coupling which are generally added to ordinary epoxy resin adhesives. Additives such as agents and defoamers may be appropriately selected and contained.

As the above-mentioned C component, for example,
Powdery thermoplastic resin having a particle size of 1 to 200 μm,
Specifically, polyethylene powder, polyvinyl chloride powder, thermoplastic polyurethane powder (TPU) and the like can be exemplified, and they can be filled in an adhesive in the same manner as a usual filler. Further, the content ratio of the C component is 50 parts by weight or less, more preferably 30 parts by weight or less with respect to 100 parts by weight of the total of the A component and the B component in order to secure an appropriate viscosity. On the other hand, in order to obtain the sufficient effect of the component C, it is preferable to add it in a proportion of 10 parts by weight or more.

If the D component is a filler that has been used in epoxy resin adhesives,
It is not particularly limited, for example, silica sand, talc,
Examples thereof include calcium carbonate, mica, acid clay, diatomaceous earth, kaolin, quartz, titanium oxide, silica, carbon black, phenol resin microballoons and glass balloons. The content ratio of the D component is preferably 300 parts by weight or less, more preferably 200 parts by weight or less with respect to 100 parts by weight of the total of the A component and the B component, and a sufficient effect of the D component. In order to obtain the above, it is preferable to add at a ratio of 30 parts by weight or more.

The epoxy resin adhesive composed of the above components is pre-cured at 100 to 150 ° C., preferably 115 to 130 ° C., and further reacted at the vulcanization temperature of the rubber body 16. By being heated, the polymer is polymerized to be fully hardened, and after being hardened, it is softened or melted like a thermoplastic resin by being heated to a predetermined temperature or higher.

By the way, an epoxy resin adhesive having such characteristics is commercially available, for example, "BGP manufactured by Nagase Chemtex Co., Ltd."
Examples thereof include those with trade names such as "-9FR", and such commercially available products can be appropriately selected and used. The above-mentioned "BGP-9FR" is a one-pack type adhesive agent, which is capable of rapidly reacting and fully curing during the vulcanizing operation of the rubber body 16 to exert an adhesive action. Even after curing and adhesion, it can be easily softened or melted by heating at 190 ° C. or higher, more preferably 200 ° C. or higher.

The epoxy resin adhesive as described above is applied to the shaft member 14 in the same manner as the conventional thermosetting adhesive, and the epoxy resin adhesive is used as the shaft member. Epoxy resin adhesive layer 1 is applied so as to spread over the entire adhesive surface (outer peripheral surface) of 14
8 is formed.

Further, in the rubber wheel 12 of this example, the undercoat which is a vulcanizing adhesive for rubber similar to the conventional one is formed on the outer periphery of the epoxy resin adhesive layer 18 thus formed. The undercoat vulcanization adhesive layer 20 and the topcoat vulcanization adhesive layer 22 are formed by applying the adhesive and the overcoat adhesive, and the shaft member 1 made of different materials is formed by these.
4 and the rubber body 16 can be adhered to each other with a further excellent adhesive force.

The vulcanizing adhesive constituting the undercoat / overcoat vulcanizing adhesive layers 20 and 22 is not particularly limited as long as it has been conventionally used for bonding rubber elastic bodies. Instead, for example, one-component or two-component adhesives made of thermosetting rubber or resin such as chlorinated rubber adhesives, phenolic resin adhesives, and isocyanate adhesives can be exemplified. Then, such a vulcanized adhesive can be appropriately selected and used as the undercoating adhesive or the topcoating adhesive depending on the compounding composition of the rubber body 16 and the like. It should be noted that such a vulcanizing adhesive for rubber is preferably used so as to form a layer on the side in contact with the inner peripheral surface of the rubber body 16, and such a vulcanizing adhesive for rubber is used. By using the rubber body 16
It is possible to further firmly bond the.

Thus, the undercoat / topcoat vulcanizing adhesive layer 2
The rubber body 16 made of an unvulcanized rubber composition is integrally formed on the surface of the shaft member 14 on which 0 and 22 are formed, and the vulcanization operation is performed. In performing such vulcanization, a conventionally known method can be appropriately adopted. For example, using a vulcanization molding die, the adhesive layers 18, 20, The shaft member 14 on which 22 is formed is arranged, and an unvulcanized rubber composition is filled in the molding cavity of the molding die to coaxially and integrally mold the rubber body 16, Such a rubber body 16 is vulcanized, a vulcanization molding operation is performed, and at the same time, the adhesive layer 1
The shaft member 14 and the rubber body 1 are made by hardening 8, 20, 22.
A method of performing vulcanization adhesion with No. 6 will be adopted. Even under the vulcanizing conditions in the vulcanizing operation of the rubber body 16, the time and temperature conditions generally used in the past are appropriately adopted, and by this operation, the adhesive layer 18, The curing and adhesion of 20, 22 can be fully realized.

By the way, in this example, the rubber body 16
Examples of the rubber composition that gives a natural rubber, diene-based synthetic rubber such as isoprene rubber, butadiene rubber, styrene / butadiene rubber, acrylonitrile / butadiene rubber, chloroprene rubber, butyl rubber, acrylic rubber, urethane rubber, ethylene propylene rubber, and silicone. For various rubber materials such as rubber and fluororubber alone or in combination, if necessary, a reinforcing agent,
A variety of known rubber compounding agents such as softening agents, vulcanizing agents, vulcanization accelerators, vulcanization accelerating aids, antioxidants, etc. are blended within the usual range and used. The rubber body 16 is vulcanized and molded.

Further, the shaft member 14 constituting the rubber wheel 12
Any conventionally known material can be used as long as it has rigidity of a metal material or a resin material. Of these, of course, those subjected to a base treatment such as degreasing treatment or chemical conversion coating treatment can be preferably used,
Needless to say.

Thus, in the rubber wheel 12 manufactured by integral vulcanization molding as described above, a specific epoxy resin adhesive is applied to the portion in contact with the outer peripheral surface of the shaft member 14.
That is, the adhesive layer 1 made of an epoxy resin adhesive that is softened or melted by heating even after curing and bonding.
From the place where 8 is formed and the rubber body 16 is adhered, the adhesion between the shaft member 14 and the rubber body 16 can be easily released only by heating it to a predetermined temperature or higher, As a result, it is possible to separate and collect them very easily. Moreover, since the epoxy resin-based adhesive employed here is one which is polymerized by accelerating the curing reaction during vulcanization molding of the unvulcanized rubber body 16, the vulcanization is performed. At the time of molding, the adhesive layer 18 does not melt and flow out, and
Adhesive strength similar to that of conventional thermosetting vulcanizing adhesives can be advantageously secured.

The rubber wheel 12 thus obtained is used, for example, as a caster for facilitating the movement of industrial trolleys, furniture, chairs, etc., as in the conventional case.
A bearing or a support shaft (not shown) is inserted into the inner hole of the shaft member 14 so as to be attached to the lower part of the industrial trolley, furniture, chair or the like for use. In addition, after being used for many years, the rubber member 16 is discarded due to abrasion and the like, and when it is collected, it is heated to a temperature higher than the vulcanization temperature of the rubber member 16 so that the shaft member 14 and the rubber member 16 are not heated. The body 16 can be easily separated.

Although the typical embodiments of the present invention have been described in detail above, they are merely examples, and the present invention is not limited to the specific description of such embodiments. It should be understood that it should not be construed as limiting.

For example, in the above-mentioned specific example, two undercoat / topcoat vulcanizations made of a vulcanizing adhesive are further provided on the epoxy resin adhesive layer 18 provided so as to be in contact with the outer peripheral surface of the shaft member 14. Although the adhesive layers 20 and 22 are formed, the vulcanized adhesive layer is not limited to the illustrated one as long as it is provided so as to be in contact with the rubber body 16, and is a single layer. It does not matter whether it is present or formed from three or more layers.

The specific material and shape of the shaft member and the rubber body employed are appropriately determined according to the required characteristics, and are not limited in any way. Specifically, in the above example, a cylindrical member is used as the shaft member 14, while the rubber member 16 is the shaft member 1.
Although a thick cylindrical shape having a length similar to that of No. 4 was integrally bonded so as to cover the entire peripheral surface of the shaft member 14, for example, a solid cylindrical shape was used as the shaft member. While adopting the present one, it is also possible to adopt an annular one having a shorter length than the shaft member as the rubber body.

Although not listed one by one, the present invention
Based on the knowledge of those skilled in the art, it can be implemented in various modified, modified, and improved modes, and
It goes without saying that all such embodiments are included in the scope of the present invention without departing from the spirit of the present invention.

[0041]

EXAMPLES Hereinafter, representative examples of the present invention will be shown to clarify the present invention in more detail. However, the present invention is not limited by the description of such examples. Needless to say, it is not something to receive.

First, rubber materials: natural rubber, carbon black: HAF carbon, vulcanization accelerating aid: zinc oxide + stearic acid, and an antioxidant are placed in a Banbury mixer in accordance with various compounding compositions shown in Table 1 below. Was added and kneaded, and then a vulcanizing agent: sulfur and a vulcanization accelerator: N-cyclohexyl-2-benzothiazolylsulfenamide (CZ) were added at a ratio shown in Table 1 below. A rubber composition was prepared by kneading with a roll machine and uniformly blending.

[0043]

[Table 1]

Example 1 After sandblasting the outer peripheral surface (adhesive surface), an iron shaft member degreased with a solvent (toluene, alcohol, methyl ethyl ketone, etc.) was used, and an epoxy resin adhesive was applied to the outer peripheral surface. Agent: BGP-9FR (manufactured by Nagase Chemtex Co., Ltd.) is applied and pre-cured at 120 ° C. for 30 minutes, and then on the surface thereof, an undercoat adhesive for rubber: Metalloc PH is used in the same manner as in the past. -50 (manufactured by Toyo Kagaku Kenkyusho Co., Ltd.) is applied and dried with hot air.
Adhesive for rubber: Metalloc G (manufactured by Toyo Kagaku Kenkyusho Co., Ltd.) was overcoated and dried with hot air. Then, the iron shaft member is placed at a predetermined position in the molding cavity of the vulcanization molding die, and the molding cavity of the molding die is filled with the unvulcanized rubber composition prepared above. hand,
While the unvulcanized cylindrical rubber body is integrally molded on the adhesive surface coated with the adhesive, the vulcanization condition of 170 ° C. × 10 minutes
A vulcanization operation was performed to produce a test piece according to Example 1.

Example 2 A shaft member made of a polyamide resin whose outer peripheral surface was degreased with a solvent (toluene, alcohol, methyl ethyl ketone, etc.) was used, and an epoxy resin adhesive: BGP was used on the outer peripheral surface.
After applying -9FR (manufactured by Nagase Chemtex Co., Ltd.) and performing pre-curing at 120 ° C. for 30 minutes, the surface thereof is coated with an undercoat adhesive for rubber: Metalloc PH-50 (in the same manner as conventional). (Toyo Kagaku Kenkyusho Co., Ltd.) was applied and dried with hot air, and an adhesive for rubber: Metalloc G (Toyo Kagaku Kenkyusho) was overcoated and dried with hot air. Then, such a resin shaft member is placed at a predetermined position in the molding cavity of the vulcanization molding die, and the unvulcanized rubber composition prepared above is placed in the molding cavity of the molding die. While the unvulcanized cylindrical rubber body was integrally molded on the adhesive surface coated with the adhesive, the vulcanization operation was performed under vulcanization conditions of 170 ° C. × 15 minutes, and Example 2 A test piece according to was produced.

Comparative Example 1 The same degreasing-treated shaft member as in Example 2 was used, and the outer peripheral surface of the shaft member was coated with a rubber undercoat adhesive: Metalloc PH-50 (Toyo Co., Ltd.) in a conventional manner. Chemical laboratory) was applied and dried with hot air. Further, an adhesive for rubber: Metalloc G (produced by Toyo Kagaku Kenkyusho Co., Ltd.) was overcoated and dried with hot air. Then, such a resin shaft member is placed at a predetermined position in the molding cavity of the vulcanization molding die, and the unvulcanized rubber composition prepared above is placed in the molding cavity of the molding die. Fill,
While the unvulcanized cylindrical rubber body is integrally molded on the adhesive surface to which the adhesive is applied, under vulcanization conditions of 170 ° C. × 15 minutes,
A vulcanization operation was performed to produce a test piece according to Comparative Example 1.

-Adhesion Test- Then, the following adhesion test was performed on the test piece thus obtained. That is, the rubber body of each test piece was first provided with eight notches extending straight in the axial direction at a depth enough to reach the outer peripheral surface of the shaft member at equal intervals in the circumferential direction. Next, each test piece provided with a notch is set to a predetermined temperature (normal temperature: 25 ° C., medium temperature: 7
After holding at 0 ℃, high temperature: 120 ℃), under that temperature condition, grab the rubber part with pliers or pliers,
The rubber body was peeled off from the shaft member by twisting. At this time, the test piece which was not easily peeled off due to the rubber body part being torn off was marked with “Good”, and conversely, the test piece which was peeled off easily had poor adhesion. From there, the result obtained as "x" is
The results are shown in Table 2 below.

[0048]

[Table 2]

-Separation / Recovery Test-In addition, the rubber body was peeled from the shaft member and the recoverability was evaluated in the same manner as in the above-mentioned adhesion test except that the temperature was set to 200 ° C. The results are shown in Table 3. In addition,
The evaluation was carried out in two stages of ◯ and ×, ◯: easy peeling and good recoverability, ×: difficult peeling and recovery.

[0050]

[Table 3]

As is clear from the results shown in Tables 2 and 3, the test pieces according to Examples 1 and 2 have 2
At 5 ° C., 70 ° C., and 120 ° C., sufficient adhesive strength is ensured, and when heated to 200 ° C., the shaft member and the rubber body are easily separated and the recoverability is good. I understand.

[0052]

As is apparent from the above description, the rubber wheel according to the present invention has a high level of adhesive strength comparable to that of a rubber wheel adhered with a conventional vulcanizing adhesive. The shaft member and the rubber body can be easily separated and collected by ensuring the temperature and after the use thereof, by heating to a predetermined temperature to soften / melt the adhesive layer. Of.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing an example of a conventional rubber wheel.

FIG. 2 is an explanatory sectional view showing an example of a rubber wheel according to the present invention.

[Explanation of symbols]

12 rubber wheels 14 Shaft member 16 rubber body 18 Epoxy resin adhesive layer 20 Undercoat vulcanizing adhesive layer 22 Overcoat vulcanizing adhesive layer

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Claims (3)

[Claims] 1. A rubber wheel formed by integrally vulcanizing an annular or cylindrical rubber body on an outer peripheral surface of a metal or resin shaft member with an adhesive layer interposed therebetween, the adhesive agent At least the portion of the layer that is in contact with the outer peripheral surface of the shaft member is softened by heating after curing / bonding /
A separately recoverable rubber wheel, which is formed by using a meltable epoxy resin adhesive. 2. The epoxy resin adhesive comprises an epoxy resin having an average number of epoxy groups of 1.5 to 2.2 and a curing agent having two functional groups capable of reacting with epoxy groups. The rubber wheel according to claim 1, which is separately collected. 3. The rubber is composed of a plurality of layers, and a layer of the plurality of layers which is in contact with the outer peripheral surface of the shaft member is formed of the epoxy resin adhesive, while the rubber is formed. The rubber wheel according to claim 1 or 2, wherein the layer on the side in contact with the body is formed of a vulcanizing adhesive.