Rubber material and method for manufacturing the same

Abstract

In rubber materials, the adhesion between the base material and the coating agent is improved. [Solution] A molded substrate made of silicone rubber or fluorosilicone rubber is prepared, and a flame gas containing a silicon-containing component is sprayed onto the surface of the substrate while moving it relative to the substrate surface to adhere silicon dioxide particles to the substrate surface, after which a solvent containing a liquid fluorine elastomer is applied. This yields a rubber material in which silicon dioxide particles are interposed between the substrate and the coating layer containing fluorine-based siloxane.

Description

Technical Field

[0001] The present invention relates to a rubber material provided with a coating layer on a substrate and a method for manufacturing the same.

Background Art

[0002] In recent years, with the increasing density of wiring, in order to form through-holes with a higher aspect ratio, the process temperature has been lowered, and a seal having low-temperature sealing performance and corrosion-resistant gas performance has been demanded.

[0003] Therefore, a seal with added corrosion-resistant gas performance is known by applying a solvent containing a fluorine-based siloxane to silicone rubber (for example, Patent Document 1).

[0004] On the other hand, as in Patent Document 2, there is known a surface modification method for a solid substance, in which a flame of a fuel gas containing a modifier compound containing a silane atom, a titanium atom or an aluminum atom, and having a boiling point of 10 to 100 ° C, is sprayed onto the surface of a solid substance such as silicone rubber or fluororubber in its entirety or partially for 0.1 second to 100 seconds.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] In a seal such as that of Patent Document 1, the adhesion between the silicone rubber and the coating agent is low, and the coating layer may be easily peeled off.

[0007] The present invention has been made in view of the above, and its objective is to improve the adhesion between a substrate and a coating agent in rubber materials. [Means for solving the problem]

[0008] To achieve the above objective, this invention interposes silicon dioxide particles between the substrate and the coating layer.

[0009] Specifically, in the first invention, Using silicone rubber or fluorosilicone rubber as the base material, Silicon dioxide particles are interposed between the substrate and the coating layer containing the fluorine elastomer.

[0010] According to the above configuration, the interposed silicon dioxide particles make the substrate hydrophilic, which prevents the coating layer containing the fluorine elastomer from peeling off, resulting in a rubber material with high corrosion gas resistance.

[0011] In the second invention, in the first invention, This is an annular sealing material in which the coating layer is applied to the entire surface with the silicon dioxide particles interposed therein.

[0012] According to the above configuration, even with annular sealing materials that are prone to twisting, the coating layer is less likely to peel off, and an annular sealing material with high corrosion gas resistance and good sealing performance can be obtained.

[0013] In the invention of the third method for manufacturing rubber material, Prepare a molded base material made of silicone rubber or fluorosilicone rubber. A flame gas containing silicon is blown onto the surface of the substrate while moving it relative to it. After attaching silicon dioxide particles to the surface of the substrate, Apply a solvent containing liquid fluorine elastomer.

[0014] According to the above configuration, by attaching silicon dioxide particles between the base material and the coating layer easily with a flame gas containing a silicon-containing component, the surface of the base material is hydrophilized. Therefore, after applying a coating layer containing a fluorine elastomer, it becomes difficult to peel off, and a rubber material with high corrosion-resistant gas properties can be obtained.

[0015] In the fourth invention, in the third invention, While relatively moving a flame gas containing a silicon-containing component with respect to the surface of the base material, the same location is sprayed two or more times and 100 times or less.

[0016] According to the above configuration, by spraying the same location two or more times, locations that have not been sprayed can be eliminated, and by setting it to 100 times or less, unnecessary man-hours can be reduced.

[0017] In the fifth invention, in the fourth invention, While relatively moving a flame gas containing a silicon-containing component with respect to the surface of the base material, the same location is sprayed 10 times or more and 25 times or less.

[0018] According to the above configuration, silicon dioxide particles can be efficiently interposed between the surface of the base material and the coating layer.

[0019] In the sixth invention, in any one of the third to fifth inventions, The solvent containing the liquid fluorine elastomer Contains 10 mass% or more and 20 mass% or less of a fluorine-based siloxane and 1 mass% or more and 10 mass% of a fluorine-based acrylic polymer with respect to 100 weight% of the fluorine solvent.

[0020] According to the above configuration, since the fluorine solvent contains appropriate amounts of a fluorine-based siloxane and a fluorine-based acrylic polymer, a coating excellent in corrosion-resistant gas properties can be obtained.

Effects of the Invention

[0021] As described above, according to the present invention, in the rubber material, the adhesion between the base material and the coating agent can be improved.

Brief Description of the Drawings

[0022] [Figure 1] It is a flowchart showing a method for manufacturing a rubber material according to an embodiment of the present invention. [Figure 2] It is a front view showing a state of performing flame treatment on an O-ring. [Figure 3] It is a schematic view showing a state of performing flame treatment. [Figure 4] It is a perspective view showing a state of performing coating treatment on an O-ring. [Figure 5] It is a graph showing the relationship between the number of flame treatments and the contact angle.

Modes for Carrying Out the Invention

[0023] Hereinafter, embodiments of the present invention will be described based on the drawings.

[0024] FIG. 1 shows the manufacturing procedure of the rubber material according to the embodiment of the present invention. The base material of the O-ring W as this rubber material is made of silicone rubber, fluorosilicone rubber, etc. Silicone rubber is excellent in high cold resistance, and fluorosilicone rubber is more excellent in oil resistance than silicone rubber.

[0025] The flame gas contains a silane compound. Examples of the silane compound include an alkylsilane compound or an alkoxysilane compound. Specific examples thereof are tetramethylsilane, tetraethylsilane, 1,2-diphenyltetramethylsilane, 1,2-dichlorotetraethylsilane, 1,2-diphenyltetraethylsilane, 1,2,3-triphenyltetramethylsilane, and dimethyldiethyltetrasilane.

[0026] Next, an example in which the base material is fluorosilicone rubber will be described using FIG. 1.

[0027] In step S01, the O-ring W is formed. The forming method is not limited to the following examples.

[0028] First, the fluorosilicone rubber, which will serve as the base material, is roll-mixed and then subjected to primary vulcanization (150°C to 180°C for 10 to 15 minutes).

[0029] Afterward, secondary vulcanization is performed (190°C to 220°C for 3 to 5 hours).

[0030] After cooling, the molding of the O-ring W is complete.

[0031] Next, in step S02, wipe the O-ring W with a cloth soaked in ethanol, blow air onto it, and then let it air dry for 3 minutes to allow the ethanol to evaporate from the O-ring W.

[0032] Next, in the flame treatment of step S03, the reaction site of the flame containing the silane compound from the burner 1 is sprayed onto one side of the O-ring W placed on the wire mesh 2, causing nanoparticles mainly composed of SiO2 to adhere to the surface of the O-ring.

[0033] In this case, the distance from the flame outlet to the O-ring W is, for example, 30 mm, but is not limited to this. The irradiation time is, for example, 20 seconds on both the inner and outer diameters of the O-ring W. For example, the burner 1 is fixed, and the rotation speed of the wire mesh 2 on which the O-ring W is placed is, for example, 70 rpm, but is not limited to this. The burner 1 side may also be rotated.

[0034] The number of times the flame is sprayed on the same spot on the surface of the O-ring W should ideally be between 2 and 100 times. Spraying only once may result in insufficient coating in some areas, while spraying more than 100 times increases the workload and time, and may result in an excessively thick coating film.

[0035] Next, in the spray coating step S04, the coating liquid is applied to the flame-treated surface using the spray gun 3. The coating liquid is prepared by mixing the following materials in a weight percentage ratio, for example, A:B:C = 16:8:100, and applying it to the O-ring W, but is not limited to this.

[0036] Agent A is a fluorinated siloxane, preferably in an amount of 10% to 20% by mass relative to 100% by weight of Agent C (solvent). For example, X-70-042 (fluororesin solution, hydrofluoroether) from Shin-Etsu Chemical Co., Ltd. can be used as Agent A.

[0037] Agent B is a fluorinated acrylic polymer, preferably in an amount of 1% to 10% by mass relative to 100% by weight of Agent C. As Agent B, for example, X-71-716-2 (a perfluoropolyether mixture containing liquid fluorine elastomer, metaxylene hexaphyllolide, and alkoxysilane) from Shin-Etsu Chemical Co., Ltd. can be used.

[0038] Agent C is a fluorine-based solvent; for example, SOLBLE-F100 (methyl nonafluoroisobutyl ether) from Solvex Co., Ltd. is used.

[0039] The coating time is, as an example, 30 seconds for both the inner and outer diameters, with a liquid discharge rate of 0.7 g / s to 1.0 g / s from the spray gun 3, and a particle size of 0.5 mm or less during spraying. For example, the spray gun 3 can be fixed, and the rotation speed of the wire mesh on which the O-ring W is placed can be set to 80 rpm for spray coating. This allows for coating the same area on the surface of the O-ring W multiple times. The spray gun 3 can also be moved.

[0040] Next, in the heat treatment of step S05, the vehicle is heated at 150°C for 1 hour.

[0041] After cooling for a predetermined time, step S06 is used to check for any untreated surfaces. In this embodiment, the back side of the O-ring W is the untreated surface, so it is flipped over and steps S03 to S05 are repeated.

[0042] In step S06, the untreated surface is checked again, and since both the front and back surfaces are coated, the process is terminated after cooling to room temperature in step S07.

[0043] Figure 5 shows the results of a test on the wettability when the number of flame treatments was varied in the manufacturing method described above.

[0044] In the aforementioned manufacturing method, silicon dioxide particles are attached to the substrate surface as hydrophilic groups, thereby improving the adhesion between the substrate and the coating agent. Since the substrate surface becomes hydrophilic due to the addition of hydrophilic groups, it is expected that it will be easily wetted when water is dropped onto it.

[0045] Therefore, to quantitatively represent this wettability, the contact angle was measured and the substrate surface was evaluated. A smaller contact angle indicates that the substrate surface is more wettable (i.e., more hydrophilic groups are attached). From this, it can be inferred that a smaller contact angle also improves adhesion with the coating agent.

[0046] As shown in Figure 5, when no flame treatment is performed at all, the water droplets become almost spherical, indicating very poor hydrophilicity. When the flame is sprayed just once, the hydrophilicity improves dramatically compared to when no flame treatment is performed. However, with only one spray, the contact angle is not stable. This indicates that there are areas where the coating is insufficient. Spraying the flame two or more times has the advantage of stabilizing the hydrophilicity.

[0047] In particular, it can be observed that the hydrophilicity is further improved when the coating is sprayed 10 to 25 times. In this case, silicon dioxide particles can be efficiently interposed between the substrate surface and the coating layer.

[0048] Thus, in this embodiment, silicon dioxide particles are easily attached between the substrate and the coating layer by a flame gas containing silicon components, thereby hydrophilizing the substrate surface. This makes the coating layer containing fluorine elastomer less likely to peel off after application, resulting in an O-ring W with high corrosion resistance to gases.

[0049] Furthermore, even with annular sealing materials that are prone to twisting, the coating layer is less likely to peel off, and an O-ring W with high corrosion gas resistance and good sealing performance can be obtained.

[0050] Therefore, according to this embodiment, the adhesion between the base material and the coating agent can be improved in rubber materials such as O-rings W.

[0051] (Other embodiments) The present invention may also have the following configuration in the above embodiment.

[0052] In other words, although fluorosilicone rubber was used as the base material in the above embodiment, the same effects can be obtained using silicone rubber as the base material.

[0053] Furthermore, while the example of O-ring W was used to describe the rubber material, there are no particular limitations on the rubber material used in applications requiring corrosion gas resistance, and the shape, such as plate or rod, is also not a concern.

[0054] The embodiments described above are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or uses. [Explanation of symbols]

[0055] 1 burner 2 Wire mesh 3. Spray gun WO ring (rubber material)

Claims

1. Using silicone rubber or fluorosilicone rubber as the base material, Silicon dioxide particles are interposed between the substrate and the coating layer containing fluorine-based siloxane. A rubber material characterized by the following features.

2. This is an annular sealing material in which the coating layer is applied to the entire surface with the silicon dioxide particles interposed therein. The rubber material according to feature 1.

3. Prepare a molded base material made of silicone rubber or fluorosilicone rubber. A flame gas containing silicon is blown onto the surface of the substrate while moving it relative to it. After attaching silicon dioxide particles to the surface of the substrate, Apply a solvent containing liquid fluorine elastomer. A method for manufacturing rubber material characterized by the following:

4. A flame gas containing silicon is blown onto the same spot two to 100 times while moving it relative to the surface of the substrate. The method for manufacturing a rubber material according to claim 3.

5. A flame gas containing silicon is blown onto the same spot 10 to 25 times while moving it relative to the surface of the substrate. The method for manufacturing a rubber material according to feature 4.

6. The solvent containing the liquid fluorine elastomer is This product contains 10% to 20% by mass of fluorinated siloxane and 1% to 10% by mass of fluorinated acrylic polymer per 100% by weight of fluorinated solvent. The method for manufacturing a rubber material according to claim 3.

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