How to bond resin and rubber materials

Abstract

To provide a method for bonding a rubber material and a resin material which improves bond strength between a resin material and a rubber material, and is converted into a composite product that hardly prevents peeling, and a composite product of a resin material and a rubber material using the same.SOLUTION: A method for bonding a resin material 1 and a rubber material 3 includes a surface treatment step of roughening the surface of the resin material 1; an adhesive coating step of coating an adhesive 2 onto the treated roughened surface 1a; and a vulcanization bonding step of vulcanizing and bonding the rubber material 3 onto the adhesive coating surface of the resin material 1, wherein, especially, the adhesive coating step coats the adhesive 2 onto the resin material 1 under vibration environment by ultrasonic irradiation.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for bonding resin materials and rubber materials. By law It is related to. [Background technology]

[0002] In composite products made by bonding resin material and rubber material, there is a bonding method that involves three steps: a surface treatment step (1) in which the surface of the resin material 1 is subjected to surface treatment, for example by laser irradiation, to make the treated surface a rough surface (finely uneven surface) 1a, as shown in Figure 3(a); an adhesive application step (2) in which an adhesive 2 is applied to the rough surface 1a, which is the treated surface of the resin material, after the surface material treatment step (1), as shown in Figure 3(b); and a vulcanization bonding step (3) in which a rubber material 3 is vulcanization bonded onto the adhesive on the resin material 1 after the adhesive application step (2), as shown in Figure 3(c). Such vulcanization bonding methods for resin and rubber have been used for some time, and in particular, for the purpose of preventing peeling due to insufficient vulcanization adhesion with rubber materials, there is a method, as described in Patent Document 1, in which the surface of the resin material is subjected to a surface treatment process to make the average surface roughness of the surface 0.1 or more, and then an adhesive is applied to the treated surface to vulcanize and bond the rubber material.

[0003] However, with this type of vulcanization bonding method, even if the surface roughness is set to 0.1 or more, it is not possible to ensure a strong bond between the rubber material and the resin material, and there is a risk of peeling occurring in the composite product. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-89565 Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, the present invention provides a method for bonding rubber and resin materials that improves the adhesive strength between the resin and rubber materials and makes it possible to produce a composite product that is less susceptible to peeling. The law The purpose is to provide. [Means for solving the problem]

[0006] A first invention for solving the above problems is a method for bonding a resin material and a rubber material, comprising: a surface treatment step of roughening the surface of the resin material; The resin material is placed above a vibration generator via a plate-shaped vibration plate that is slightly larger than the bottom surface of the resin material. While the resin material is vibrated, an adhesive is sprayed onto the treated rough surface. an adhesive application step of applying an adhesive; a vulcanization adhesion step of vulcanizing and adhering a rubber material to the adhesive-coated surface of the resin material. It is characterized by: The second invention is A method for bonding a resin material and a rubber material, comprising: a surface treatment step of roughening the surface of the resin material; an adhesive application step in which a vibrating tank is placed above a vibration generator, a resin material is placed on a bottom surface of the vibrating tank with the treated rough surface facing upward, and the resin material is immersed in adhesive while the resin material in contact with the vibrating tank is vibrated; a vulcanization adhesion step of vulcanizing and adhering a rubber material to the adhesive-coated surface of the resin material. It is characterized by: The third invention is: A method for bonding a resin material and a rubber material, comprising: a surface treatment step of roughening the surface of the resin material; an adhesive application step in which a vibration tank is placed above a vibration generator via a plate-shaped vibration plate that is slightly larger than the bottom surface of the resin material, and the resin material is placed on the bottom surface of the vibration tank with the surface-treated rough surface facing up, and the resin material is immersed in adhesive, and the resin material in contact with the vibration tank is vibrated while the adhesive is applied to the treated rough surface; a vulcanization adhesion step of vulcanizing and adhering a rubber material to the adhesive-coated surface of the resin material. It is characterized by: The fourth invention is any one of the first to third inventions. The vibration frequency of the vibration generator is 38 kHz.

[0007] In this method of bonding resin and rubber materials, in the adhesive application process, vibrations are applied to the resin material in a vibration environment using a vibration generator, causing the adhesive to be applied so that it penetrates deeper into the recesses on the rough surface of the resin material, thereby further improving the adhesive holding strength between the resin and adhesive, and as a result, the resin and rubber materials are bonded more firmly. [Effects of the Invention]

[0008] According to the present invention, a method for bonding rubber and resin materials is provided that improves the adhesive strength between the resin and rubber materials, thereby making it possible to produce a composite product that is less susceptible to peeling. The law We can provide it. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram showing a first embodiment in which a diaphragm is used in the adhesive application step of the method for bonding a resin material and a rubber material of the present invention. [Figure 2] FIG. 10 is a schematic diagram showing a second embodiment in which a vibration tank is used in the adhesive application step of the method for bonding a resin material and a rubber material of the present invention. [Figure 3] 1 is a schematic diagram showing all steps of a conventional method for bonding a resin material and a rubber material. DETAILED DESCRIPTION OF THE INVENTION

[0010] This embodiment is a method for bonding resin and rubber materials, which comprises a surface treatment process (1) for roughening the surface of a resin material, an adhesive application process (2') for applying an adhesive to the treated surface, and a vulcanization bonding process (3) for vulcanizing and bonding a rubber material to the adhesive-coated surface of the resin material. In particular, the adhesive application process (2') is characterized in that the adhesive is applied to the resin material in a vibration environment caused by ultrasonic irradiation. As a result of these processes, a composite product made of resin and rubber materials is completed.

[0011] First, as in the surface treatment step (1) shown in Fig. 3(a) of the prior art, the surface of the flat resin material 1 is treated with a carbon dioxide laser, and the treated surface becomes a rough surface 1a with fine irregularities. In addition to roughening the surface, this type of surface treatment also has the effect of removing dirt, oil, and other contaminants adhering to the surface of the resin material 1, eliminating the need for degreasing and cleaning, which is a pretreatment for the bonding process.

[0012] In addition to carbon dioxide lasers, other types of laser irradiation treatments are considered, such as liquid lasers, solid-state lasers, and semiconductor lasers. In all treatment methods, the surface of the resin material 1 is activated by irradiating it with a laser, which breaks the bonds on the surface, forming a rough surface 1a consisting of fine irregularities and expanding the surface area, thereby increasing the adhesive strength. Another advantage of this type of laser treatment is that the type and intensity (number of photons) of the laser can be easily controlled. As the surface treatment means, in addition to laser treatment, blast treatment, plasma treatment, corona treatment, etc. can also be applied.

[0013] Of these, blasting can be done using water (wet method) or compressed air (dry method), and involves spraying mixed fine granular projectile material onto the surface of the resin material 1, making the treated surface rough with fine irregularities. By changing the type, particle size and spray pressure of the projectile material, it is possible to process the surface to an appropriate roughness.

[0014] In addition, plasma treatment and corona treatment are used to etch the surface to create the desired rough surface (finely uneven surface), and at the same time chemically treat the surface layer to make it hydrophilic or hydrophobic, thereby adhering the surface shape.

[0015] The resin material 1 in this embodiment is a plate-shaped fluororesin-based material such as polytetrafluoroethylene (PTFE) or a plate-shaped material with a surface coated with fluororesin. However, it is not limited to this, and other fluororesin-based materials such as polytetrafluoroethylene (PTFE) can also be used, such as tetrafluoroethylene / hexafluoropropylene (FEP), tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA), polychlorotrifluoroethylene (PCTFE), ethylene / tetrafluoroethylene copolymer (ETFE), and ethylene / chlorotrifluoroethylene copolymer (ECTFE).

[0016] Next, in an adhesive application step (2') similar to that shown in FIG. 3(b), an adhesive 2 is applied to the roughened surface 1a of the resin material 1. In this embodiment, the adhesive application step (2') uses an ultrasonic vibration generator 4 described below to apply the adhesive 2 in a vibration environment caused by ultrasonic irradiation. This improves the adhesive strength between the resin material 1 and the rubber material 3, making peeling less likely to occur (see peeling test results described below). Methods for applying the adhesive 2 include, for example, spraying it onto the rough surface 1a, immersing the resin material 1, or applying it onto the rough surface 1a with a brush, but an appropriate method can be selected as needed.

[0017] As the adhesive 2, a vulcanizing adhesive 2 (hereinafter simply referred to as adhesive 2) containing various resin materials such as phenolic resin, epoxy resin, and silicone resin as its main component is used. In this embodiment, the adhesive 2 used is a product name "Metalock" (registered trademark, omitted hereinafter) manufactured by Toyo Kagaku Kenkyusho Co., Ltd. The type and application amount of adhesive 2 to be used are determined appropriately depending on the type of resin material 1 to be used in the adhesive application step (2'), the required adhesive strength, etc.

[0018] As shown in FIG. 3(c), the final step is a vulcanization adhesion step (3) in which a rubber material 3 is adhered to the resin material 1 that has been subjected to the adhesive application step (2'). This vulcanization bonding process is a process in which rubber material 3 is vulcanized and bonded onto adhesive 2 in resin material 1. This results in a composite product of resin material 1 and rubber material 3. In this embodiment, the vulcanization bonding method uses compression molding, in which the bonded resin material 1 and rubber material 3 are placed in a recess (cavity) of a mold and pressurized with a compression molding machine to harden them, but general vulcanization molding methods such as injection molding are also within the scope of this embodiment.

[0019] As explained above, the present invention provides a composite product in which resin material 1 and rubber material 3 are vulcanized and bonded together through a surface treatment process (1) in which the surface of the resin material is roughened, an adhesive application process (2') in which an ultrasonic vibration generator 4 is operated to vibrate the resin material 1 and apply adhesive to the treated surface, and a vulcanization bonding process (3) in which rubber material 3 is vulcanized and bonded to the adhesive-coated surface of the resin material 1.

[0020] In the present invention, the adhesive application step (2') has a special technical feature, and therefore, here, detailed explanations will be given for embodiment 1 in which the adhesive is applied by spraying to a resin material 1 placed on an ultrasonic vibration generator 4, and embodiment 2 in which the adhesive is applied by immersing the resin material 1 in a vibration tank 6 containing adhesive 2. Note that, although the adhesive application step (2') will be explained using an embodiment using ultrasonic vibration, vibrations other than ultrasonic vibrations can also be used, and the present invention is not limited to ultrasonic vibration. Furthermore, the present invention is in no way limited to embodiment 1 in which the adhesive is applied by spraying, and embodiment 2 in which the adhesive is applied by immersing the resin material 1 in a vibration tank 6 containing adhesive 2.

[0021] [Embodiment 1] First, in the adhesive application step (2') of the first embodiment, the resin material 1 is placed above the ultrasonic vibration generator 4 via the vibration plate 5, and the adhesive 2 is applied to the resin material 1 while the resin material 1 is vibrated. Specifically, as shown in Fig. 1, a predetermined plate-like vibration plate 5 that is slightly larger than the bottom surface of the resin material 1 is placed above the ultrasonic vibration generator 4, and the flat resin material 1 is placed on the top surface of the vibration plate 5 with the surface-treated rough surface 1a facing upward. The ultrasonic vibration generator 4 is equipped with an ultrasonic vibrator inside, and has a structure in which ultrasonic waves are irradiated from this ultrasonic vibrator toward the top surface, and the irradiated ultrasonic waves vibrate the resin material 1 via the vibration plate 5. Here, the adhesive 2 is applied by spray injection, so the weight load on the ultrasonic vibration generator 4 body is lighter than in the second embodiment described below, in which the ultrasonic vibration generator 4 is immersed in a vibration tank 6 containing the adhesive 2. Also, since the bottom surface of the vibration plate 5 is wider than the bottom surface of the resin material 1, the ultrasonic waves are irradiated over the entire rough surface 1a of the resin material 1, and no leakage occurs.

[0022] After the resin material 1 is placed as described above, the ultrasonic vibration generator 4 is turned on and operated, vibrating the resin material 1 via the vibration plate 5. While the resin material 1 is vibrating, the adhesive 2 is sprayed onto the surface-treated roughened surface 1a by spraying. In this way, the adhesive 2 is sprayed onto the resin material 1 in a vibrating environment caused by ultrasonic irradiation from the ultrasonic vibration generator 4, and vibration is applied before the adhesive 2 dries. In combination with the spray force of the spray, the adhesive 2 is applied so that it penetrates even deeper into the recesses in the surface-treated roughened surface 1a of the resin material 1. This further improves the adhesive holding strength between the resin material 1 and the adhesive 2, resulting in stronger adhesion between the resin material 1 and the rubber material 3.

[0023] In the first embodiment, the adhesive 2 is sprayed onto the resin material 1 in a vibration environment caused by ultrasonic irradiation from the ultrasonic vibration generator 4 provided below, but the ultrasonic irradiation device 4 may be provided in a position where ultrasonic irradiation can be performed from above or both the left and right sides of the resin material 1. For example, instead of vibrating the resin material directly via a vibrating plate, ultrasonic irradiation from a so-called horn-type ultrasonic vibration generator without using a vibrating plate is also conceivable.

[0024] In this embodiment, the ultrasonic frequency irradiated by the ultrasonic vibration generator 4 is set to 38 kHz. This ultrasonic frequency is suitable for the adhesive 2 to penetrate deeply into the recesses of the finely roughened surface 1a of the resin material 1. In other words, the ultrasonic frequency vibrations finely agitate the sprayed adhesive 2 on the roughened surface 1a, accelerating adhesion even within the recesses of the roughened surface of the resin material 1. In this adhesive application step (2'), simply adding the step of applying the adhesive 2 under a vibration environment caused by ultrasonic irradiation can further strengthen the bond between the rubber material 3 and the resin material 1 compared to the conventional adhesive application step (2). While the ultrasonic frequency is set to 38 kHz, it can be appropriately determined depending on the type of resin material 1, the adhesive 2, the roughened surface condition, and other factors. For example, the ultrasonic frequency irradiated toward the roughened surface 1a of the resin material 1 can be varied (swept) to select an appropriate frequency. The vibration plate 5 is made of a lightweight stainless steel plate, which is a metal that conducts vibrations well, but this is not limited to this.

[0025] [Embodiment 2] Next, in the adhesive application step (2') of the second embodiment, a vibrating tank 6 is placed above an ultrasonic vibration generator 4, and the resin material 1 is immersed in the adhesive 2 contained in the vibrating tank 6, and the adhesive 2 is applied to the resin material 1 while the resin material 1 is vibrated. Specifically, as shown in FIG. 2, a flat resin material 1 is placed with its surface-treated roughened surface 1a facing upward on the bottom surface of the vibrating tank 6, which has a concave (box-like) cross-section and a depth dimension sufficiently greater than the thickness of the resin material 1. The vibrating tank 6 contains an amount of adhesive 2 that is sufficient to immerse the roughened surface 1a of the resin material 1, and with the resin material 1 immersed in the adhesive 2, the ultrasonic vibration generator 4 is operated to vibrate the resin material 1 and the adhesive 2 via the vibrating tank 6.

[0026] That is, ultrasonic waves are irradiated toward the upper surface from an ultrasonic vibrator provided inside the ultrasonic vibration generator 4, and this ultrasonic irradiation vibrates the resin material 1 and the adhesive 2 via the vibration tank 6. This vibration, combined with the weight pressure of the adhesive 2 on the resin material 1, causes the adhesive 2 to penetrate evenly deeper into the entire recesses of the surface-treated rough surface 1a of the resin material 1, resulting in a further improvement in the adhesive holding force between the resin material 1 and the adhesive 2, and stronger adhesion between the resin material 1 and the rubber material 3. In addition, because the bottom surface of the vibration tank 6 is wider than the bottom surface of the resin material 1, ultrasonic waves can be irradiated over the entire rough surface 1a of the resin material 1. Therefore, unlike the conventional technique of applying adhesive 2 in an environment without vibration, this is applied by immersing the adhesive 2 in a vibration tank 6, so that the adhesive 2 can be applied reliably so as to penetrate deeper into the recesses of the finely roughened surface 1a that has been surface-treated with the resin material 1.

[0027] Furthermore, in this embodiment 2, as in the above-described embodiment 1, the ultrasonic frequency emitted by the ultrasonic vibration generator 4 is set to 38 kHz, and such an ultrasonic frequency is suitable for the adhesive 2 to penetrate deep into the recesses of the finely roughened surface 1a that has been surface-treated with the resin material 1. In this way, in the adhesive application process (2'), simply by carrying out the process content such that the adhesive 2 is applied under an ultrasonic frequency vibration environment irradiated by the ultrasonic vibration generator 4, the ultrasonic vibrations agitate the adhesive 2 in the vibration tank 6 more firmly than in the conventional adhesive application process (2), and the adhesive is accelerated even in the recesses of the rough surface 1a, resulting in a stronger bond between the rubber material 3 and the resin material 1.

[0028] The frequency irradiated to the rough surface 1a of the resin material 1 and the duration of irradiation are determined appropriately depending on the type of resin material 1, the state of the adhesive 2 and the rough surface 1a, etc. For example, the ultrasonic frequency irradiated toward the rough surface 1a of the resin material 1 is changed (swept) to make an appropriate selection. The size of the vibrating tank 6 is also determined appropriately according to the size of the resin material 1, and the components of the vibrating tank 6 are made of stainless steel, a lightweight metal that conducts vibrations well, but are not limited to this.

[0029] In the second embodiment, the adhesive 2 is applied to the resin material 1 in a vibration environment where ultrasonic waves are irradiated by the ultrasonic vibration generator 4 provided below, but the ultrasonic irradiation device 4 may be provided in a position where ultrasonic waves can be irradiated from above or both the left and right sides of the resin material 1. For example, instead of directly vibrating the vibration tank, ultrasonic irradiation by a so-called horn-type ultrasonic vibration generator may also be considered.

[0030] It is also possible to combine the vibrating plate 5 of embodiment 1 and the vibrating tank 6 of embodiment 2 vertically or horizontally. In this case, the objects to be vibrated increase to the vibrating plate 5 and the vibrating tank 6, so it is necessary to further increase the ultrasonic wave irradiation power of the ultrasonic vibration generator 4.

[0031] Although the preferred embodiment of the present invention has been described above in detail, the present invention is not limited to the above-described embodiment. In the embodiment, an ultrasonic vibration generator is used as a preferred example of a vibration generator, but various other vibration generating means, such as an electromagnetic vibration generator or a motor vibrator, can be used instead. Furthermore, various modifications and changes can be made to other configurations within the scope of the gist of the present invention as set forth in the claims.

[0032] [Peel test] Of the above-mentioned vulcanization bonding methods, for the method of embodiment 2 in which the resin material 1 is immersed in the adhesive 2 contained in the vibration tank 6, the peel strength was measured and the adhesive state was evaluated in a test in which the resin material 1 was vibrated by operating the ultrasonic vibration generator 4, and in a test in which no vibration was performed. In this peel test, the above composite product was fixed using a jig for 180-degree peel tests (JIS K6854-2), and the adhesive strength was compared based on the tensile strength. The test conditions were as follows: Resin material: Polytetrafluoroethylene (PTFE) Rubber material: Fluorine rubber Adhesive: Metalock manufactured by Toyo Kagaku Kenkyusho Co., Ltd. Adhesive application: Immerse the resin material in adhesive Laser: Carbon dioxide laser Ultrasonic frequency: 38kHz ·Applying time: 30sec Vulcanization bonding method: Compression molding Peel test method: 180-degree peel test method (JIS K6854-2 compliant) The results of the peel test are shown in Table 1.

[0033] [Table 1]

[0034] In Table 1, the horizontal axis A shows the results of test pieces of a composite product manufactured through the conventional adhesive application process (2) in the configuration of embodiment 2, in which vibrations from the ultrasonic vibration generator 4 are not applied, while the horizontal axis B shows the results of test pieces of a composite product manufactured through the adhesive application process (2') of the present invention in which ultrasonic vibrations from the ultrasonic vibration generator 4 are applied, also in the configuration of embodiment 2. The vertical axis shows the peel strength values (unit: N / mm).

[0035] The above peel test confirmed good adhesion between the rubber material 3 and the resin material 1, as described in detail in embodiment 2. Specifically, as shown in the comparison in Table 1, the peel strength of test piece A, in which the resin material 1 was simply immersed in adhesive 2 without vibration, was approximately 1.17 N / mm, whereas the peel strength of test piece B, in which the resin material 1 was immersed in adhesive 2 with vibration, was approximately 1.29 N / mm. Therefore, it was found that vibration ensures sufficient adhesion compared to no vibration, improving the adhesive strength between the resin material 1 and the rubber material 3, and providing a composite product that is less likely to peel. [Explanation of symbols]

[0036] 1. Resin material 1a Rough surface (uneven part) 2. Adhesive 3. Rubber material 4. Ultrasonic vibration generator 5. Vibration Plate 6 Vibration trough

Claims

1. A method for bonding a resin material and a rubber material, comprising: a surface treatment step of roughening the surface of the resin material; an adhesive application step of applying an adhesive to the treated rough surface by spraying while the resin material is placed above a vibration generator via a plate-shaped vibration plate that is slightly larger than the bottom surface of the resin material and is vibrated; a vulcanization adhesion step of vulcanizing and adhering a rubber material to the adhesive-coated surface of the resin material.

2. A method for bonding a resin material and a rubber material, comprising: a surface treatment step of roughening the surface of the resin material; an adhesive application step in which a vibrating tank is placed above a vibration generator, a resin material is placed on a bottom surface of the vibrating tank with the treated rough surface facing upward, and the resin material is immersed in adhesive while the resin material in contact with the vibrating tank is vibrated; a vulcanization adhesion step of vulcanizing and adhering a rubber material to the adhesive-coated surface of the resin material.

3. A method for bonding a resin material and a rubber material, comprising: a surface treatment step of roughening the surface of the resin material; an adhesive application step in which a vibration tank is placed above a vibration generator via a plate-shaped vibration plate that is slightly larger than the bottom surface of the resin material, and the resin material is placed on the bottom surface of the vibration tank with the surface-treated rough surface facing up, and the resin material is immersed in adhesive, and the resin material in contact with the vibration tank is vibrated while the adhesive is applied to the treated rough surface; a vulcanization adhesion step of vulcanizing and adhering a rubber material to the adhesive-coated surface of the resin material.

4. A method for bonding resin materials and rubber materials described in any one of claims 1 to 3, characterized in that the vibration frequency of the vibration generating device is 38 kHz.

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