JPH04277529A - Bonding of metallic body with synthetic rubber body - Google Patents

Abstract

PURPOSE:To provide a process for bonding a metallic body with a synthetic rubber body which can provide a high bonding strength and can be performed at high efficiency of bonding work. CONSTITUTION:A process for bonding a nitrile rubber member 18 with a side plate 12 made of an aluminum material, wherein one side 20 of the nitrile rubber member 18 is coated with a nitrile rubber adhesive having a mixing ratio by weight of the nitrile rubber adhesive to methyl ethyl ketone of 1:m (wherein m has a value of 3-5) to form an adhesive layer 22 comprising the nitrile rubber adhesive on the side 20. The adhesive layer 22 of the nitrile rubber member 18 is laminated with one pressure-sensitive adhesive layer 28 of a structural tape having a base 26 comprising an acrylic foam and pressure-sensitive adhesive layers 28 formed no both sides of the base 26, and the other pressure-sensitive adhesive layer 28 of the structural tape 24 is laminated with the side plate 12.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of bonding a metal body to a synthetic rubber body such as nitrile rubber or neoprene rubber.

0002

[Prior Art] Conventionally, when bonding a metal body to a synthetic rubber body such as nitrile rubber or neoprene rubber, a synthetic rubber adhesive or a basic structural material was used depending on the adhesive strength required between them. Non-structural tape is used for parts of the product that carry only their own load and do not support any load.

Synthetic rubber adhesives are used when there is a high requirement for adhesive strength between a metal body and a synthetic rubber body. Synthetic rubber adhesives include nitrile rubber adhesives and neoprene rubber adhesives. In the bonding method using synthetic rubber adhesive, a synthetic rubber adhesive is applied to the adhesive surface of the metal body and the adhesive surface of the synthetic rubber body, and the adhesive surface of the metal body and the adhesive surface of the synthetic rubber body are overlapped. The body and the synthetic rubber body are crimped together.

On the other hand, non-structural tapes are used when the required adhesive strength between a metal body and a synthetic rubber body is small. Among non-structural tapes, there is a double-sided adhesive tape with adhesive layers formed on both sides of a nonwoven fabric base material, which has relatively high adhesive strength. In the adhesive method using non-structural tape, peel off the release paper on one side of the non-structural tape, apply one side of the non-structural tape to the adhesive surface of the metal object,
Peel off the release paper on the other side of the non-structural tape, paste the adhesive side of the synthetic rubber body on the other side of the non-structural tape, and press the adhesive side of the metal body and the adhesive side of the non-structural tape together. do.

[0005]

[Problems to be Solved by the Invention] However, although a bonding method using a synthetic rubber adhesive can provide a high adhesive strength, since the curing time of the synthetic rubber adhesive is about 72 hours, it is difficult to bond them together. It is necessary to leave the metal body and synthetic rubber body for a long time before moving on to the next process, and when applying synthetic rubber adhesive to the bonding surface of the metal body and the synthetic rubber body. Since a portion of the synthetic rubber adhesive may protrude from each adhesive surface, it is necessary to remove the adhesive that protrudes from the adhesive surface. As a result, work efficiency is low.

On the other hand, in the case of adhesion using non-structural tape, the release paper on each side of the non-structural tape is peeled off, and the adhesive surface of the metal object and the adhesive surface of synthetic rubber are respectively attached to each side of the non-structural tape. By pasting, the adhesion between the metal body and the synthetic rubber body is completed, so that the work of adhering the metal body and the synthetic rubber body can be carried out easily and in a short time. However, since the surface layer of the adhesive surface of the synthetic rubber body contains large amounts of additives and plasticizers, the adhesive surface of the synthetic rubber body and the adhesive layer of the non-structural tape are difficult to mix with each other. When the shape of the non-structural tape is in the form of an elongated strip, peeling between the ends of the synthetic rubber body and the non-structural tape is likely to occur. Further, the adhesive strength obtained by the adhesive method using non-structural tape is considerably lower than the adhesive strength obtained by the adhesive method using synthetic rubber adhesive.

An object of the present invention is to provide a metal body and a synthetic rubber body that can obtain an adhesive strength that is almost the same as that obtained by an adhesive method using a synthetic rubber adhesive, and that can be bonded with high efficiency. The purpose is to provide a method of adhesion.

[0008]

[Means for Solving the Problems] The present invention provides a method for bonding a metal body and a synthetic rubber body to each other, in which a synthetic rubber adhesive and a ketone solvent are mixed in a weight ratio of 1:m (m≧1). A synthetic rubber adhesive diluted with the ketone solvent is applied to the adhesive surface of the synthetic rubber body, and after the ketone solvent is evaporated, the adhesive is applied to both sides of the acrylic foam base material. The adhesive surface of the synthetic rubber body and the adhesive surface of the metal body are attached using a structural tape having layers formed thereon. The synthetic rubber body is preferably made of a nitrile rubber material, in which a nitrile rubber adhesive and methyl ethyl ketone are mixed at a weight ratio of 1:m (2<m<6). The synthetic rubber body is preferably made of neoprene rubber, and a neoprene rubber adhesive and methyl ethyl ketone are mixed at a weight ratio of 1:m (1<m<3).

[0009]

[Operation] When bonding a metal body and a synthetic rubber body by the method of the present invention, the synthetic rubber adhesive and the ketone solvent are mixed with each other, and the synthetic rubber adhesive is diluted with the ketone solvent. The agent is applied to the adhesive surface of the synthetic rubber body. Since the synthetic rubber adhesive is diluted with the ketone solvent, the concentration of the synthetic rubber adhesive becomes low, so the synthetic rubber adhesive is applied in a layer to the adhesive surface of the synthetic rubber body. The thickness of the synthetic rubber adhesive layer formed on the adhesive surface of the synthetic rubber body is the same as the thickness of the adhesive layer formed when the synthetic rubber adhesive is applied alone. become smaller.

After the synthetic rubber adhesive is applied, the ketone solvent evaporates and the synthetic rubber adhesive layer on the adhesive surface of the synthetic rubber body begins to harden. A thin rubber layer is formed on the adhesive surface of the synthetic rubber body, and the surface layer of the adhesive surface of the synthetic rubber body is covered with the rubber layer. The rubber layer is made of synthetic rubber, which is the main component of the synthetic rubber adhesive. Next, the surface of the metal body and the surface of the synthetic rubber body are bonded together using the structural tape. As a result, application of the synthetic rubber adhesive mixed with the ketone solvent to the adhesive surface of the synthetic rubber body;
The adhesion between the synthetic rubber body and the metal body is completed by evaporation of the ketone solvent for a short period of time and by bonding the adhesive surface of the synthetic rubber body and the adhesive surface of the metal body with the structural tape. , bonding work can be done easily and in a short time.

Since the surface layer of the adhesive surface of the synthetic rubber body is covered with the thin rubber layer, the adhesive layer of the structural tape comes into contact with the rubber layer of the adhesive surface of the synthetic rubber body. Because of the additives and plasticizers contained in the surface layer of the adhesive surface, the adhesive performance is not reduced, and the adhesive strength between the metal body and the synthetic rubber body is maintained at a high value.

0012

[Embodiments] Hereinafter, embodiments of the method of bonding a metal body and a synthetic rubber body according to the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a part of a casing in which a nitrile rubber member is adhered to a side plate using the method of adhering a metal body and a synthetic rubber body according to the present invention.

[0013] Housing 10 in which electronic components are housed
As shown in FIG. 1, it is made of an aluminum box, and its side plate 12 is provided with an opening 14 for installing, repairing, or replacing electronic components. The opening 14 is the cover plate 1
6, and the cover plate 16 is attached to the side plate 12 with bolts (not shown).
is fixed.

An elongated strip-shaped nitrile rubber member 18 is arranged between the side plate 12 and the cover plate 16. The nitrile rubber member 18 is compressed and deformed between the side plate 12 and the cover plate 16, and prevents dust and the like from entering the inside of the casing 10 from the outside through the gap between the cover plate 16 and the side plate 12. There is. The nitrile rubber member 18 and the side plate 12 are bonded to each other. An adhesive layer 22 made of a nitrile rubber adhesive is formed on one surface 20 of the nitrile rubber member 18 . The nitrile rubber adhesive is Sony Bond SC21.
0 (product name, manufactured by Sony Chemical Corporation).

One surface 20 of the nitrile rubber member 18 is pasted with one surface of a structural tape 24 used for product parts supporting the basic load of the structure, and the other surface of the structural tape 24 The surface is attached to the side plate 12. The structural tape 24 includes a base material 26 made of acrylic foam and an adhesive layer 2 formed on each surface of the base material 26.
8. One side of the adhesive layer 28 is overlaid on the adhesive layer 22, and the other side of the adhesive layer 28 is overlaid on the side plate 12. The structural tape 24 is Scotch Y-493.
0 (product name, manufactured by Sumitomo 3M Limited).

Next, the adhesion between the side plate 12 of the housing 10 and the nitrile rubber member 18 will be explained. First, a nitrile rubber adhesive and methyl ethyl ketone are mixed. The mixing ratio of the nitrile rubber adhesive and methyl ethyl ketone is expressed as a weight ratio. The weight ratio of the nitrile rubber adhesive to methyl ethyl ketone is 1:m, and the value of m is within the range of 3 to 5.

A nitrile rubber adhesive diluted with methyl ethyl ketone is applied to one side 20 of the nitrile rubber member 18 with a brush or spray gun. Since the nitrile rubber adhesive is diluted with methyl ethyl ketone, the concentration of the nitrile rubber adhesive becomes low.
An adhesive layer 2 formed on one side 20 of the nitrile rubber member 18 can be applied in a layered manner to one side 20 of the nitrile rubber member 18.
The thickness dimension of No. 2 is smaller than the thickness dimension of the adhesive layer formed when the nitrile rubber adhesive is applied alone. Note that as the methyl ethyl ketone evaporates, the concentration of the nitrile rubber adhesive applied to the one surface 20 of the nitrile rubber member 18 increases over time. In order to apply the adhesive in a thin layer, the time from mixing the nitrile rubber adhesive and methyl ethyl ketone to applying the nitrile rubber adhesive is preferably within about 10 minutes.

After applying the nitrile rubber adhesive, the nitrile rubber member 18 is allowed to stand for about 10 minutes. The methyl ethyl ketone volatilizes and the adhesive layer 22 on one side 20 of the nitrile rubber member 18 begins to harden. A thin rubber layer is formed on one side 20 of the nitrile rubber member 18, and the surface layer of the one side 20 of the nitrile rubber member 18 is covered with the rubber layer. The rubber layer is made of nitrile rubber, which is the main component of a nitrile rubber adhesive.

Next, the nitrile rubber member 18 and the side plate 12
and are pasted together with structural tape 24. One of the adhesive layers 28 of the structural tape 24 and the adhesive layer 22 of the nitrile rubber member 18 are overlapped with each other, the other adhesive layer 28 and the side plate 12 are overlapped with each other, and the nitrile rubber member 18 is overlapped with the adhesive layer 22 of the nitrile rubber member 18. 24 and is pressed onto the side plate 12 by a roller. After crimping with rollers, nitrile rubber member 1
8 and the side plate 12 is completed.

Since the surface layer of one side 20 of the nitrile rubber member 18 is covered with the rubber layer, one adhesive layer 28 of the structural tape 24 comes into contact with the rubber layer. A strong bonding force is generated between the nitrile rubber member 28 and the rubber layer, and there is no decrease in adhesive strength due to the additives and plasticizers contained in the surface layer of one side 20 of the nitrile rubber member 18. In addition, since the thickness of the adhesive layer 22 formed on the nitrile rubber member 18 is small, the adhesive does not protrude from one surface 20 of the nitrile rubber member 18 during pressure bonding with the roller.

[0021] As described above, the work of applying the nitrile rubber adhesive required for adhering the nitrile rubber member 18 and the side plate 12 and the work of pasting the structural tape can be done in a short time, and the work of applying the nitrile rubber adhesive to the side plate 12 can be done in a short time. It is possible to eliminate the work of removing adhesive that has protruded from the member 18, and the efficiency of the adhesion work can be improved.

The adhesive strength between the nitrile rubber member 18 and the side plate 12 is determined by the adhesive peeling adhesive strength test method (JIS
The evaluation is based on the peel strength measured by K 6854). Table 1 is a table showing the maximum value of peel strength between adherends obtained by the conventional bonding method and the maximum value of peel strength between adherends obtained by the bonding method of the present invention. Table 2 is a table showing the relationship between the peel strength between nitrile rubber and aluminum and the weight ratio of nitrile rubber adhesive and methyl ethyl ketone. The peel strength indicated by * in Table 2 is the value obtained when nitrile rubber and aluminum are bonded together using the structural tape alone.

As is clear from Table 1, the maximum peel strength between nitrile rubber and aluminum is 6.0 kg.
/25 mm, and this value is equal to the value of peel strength between nitrile rubber and aluminum obtained by a conventional bonding method using only a synthetic rubber adhesive. Furthermore, as is clear from Table 2, the peel strength between nitrile rubber and aluminum is determined when the weight ratio of nitrile rubber adhesive to methyl ethyl ketone is 1:m (3≦m≦5). The maximum value is 6.0Kg/25mm. Therefore, the nitrile rubber member 18 and the side plate 12 can be bonded with the same bonding strength as that obtained by the conventional bonding method using only a synthetic rubber adhesive. Furthermore, although an external force acts on the nitrile rubber member 18 when the lid plate 16 is opened and closed, there is no fear that the nitrile rubber member 18 will peel off from the side plate 12 due to the external force.

[0024]

[Table 1]

[0025]

[Table 2]

Next, a method of bonding the nitrile rubber member 18 and the side plate 12 using an adhesive rubber sheet will be explained. FIG. 2 is a plan view showing an adhesive rubber sheet used in another embodiment of the method of bonding a metal body and a synthetic rubber body according to the present invention, and FIG.
3 is an enlarged view showing a cross section of the adhesive rubber sheet shown in FIG. 2. FIG.

As shown in FIGS. 2 and 3, a previously prepared adhesive rubber sheet 30 is used to bond the nitrile rubber member 18 and the side plate 12. Pasting rubber sheet 3
0 has a nitrile rubber member 18, as shown in FIG. An adhesive layer 22 made of a nitrile rubber adhesive is formed on one surface 20 of the nitrile rubber member 18 . One adhesive layer 28 of the structural tape 24 is superimposed on one surface 20 of the nitrile rubber member 18, and the other adhesive layer 28 of the structural tape 24 is covered with a release paper 32.

When the adhesive rubber sheet 30 is used, the release paper 32 of the adhesive rubber sheet 30 is peeled off, and the other side of the adhesive layer 28 is placed on the side plate 12. The adhesive rubber sheet 30 is pressed onto the side plate 12 by a roller, and the adhesive rubber sheet 30 and the side plate 12 are pasted together. As a result, by pasting the pasting rubber sheet 30 and the side plate 12, the nitrile rubber member 18 and the side plate 12 are adhered with the same adhesive strength as that obtained by the conventional bonding method using only a synthetic rubber adhesive. Further, a large number of nitrile rubber members 18 are attached to the side plate 12.
A nitrile rubber member 18 having a predetermined shape and dimensions and a structural tape 2 attached thereto.
Since the adhesive rubber sheet 30 consisting of 4 can be prepared in advance, the adhesion work can be performed more easily.

Next, a method of bonding the neoprene rubber member and the aluminum member will be explained.

When bonding a neoprene rubber member and an aluminum member, methyl ethyl ketone is mixed with the neoprene rubber adhesive. The mixing ratio of neoprene rubber adhesive and methyl ethyl ketone is expressed as a weight ratio. The weight ratio of the neoprene rubber adhesive to methyl ethyl ketone was 1:m, and the numerical value of m was 2. A neoprene rubber adhesive diluted with methyl ethyl ketone is applied to the adhesive surface of the neoprene rubber member.

After applying the neoprene rubber adhesive, the neoprene rubber member is allowed to stand for approximately 10 minutes. Then,
The adhesive surface of the neoprene rubber member and the adhesive surface of the aluminum member are attached with structural tape. One adhesive layer of the structural tape and the adhesive surface of the neoprene rubber member are overlapped with each other, and the other adhesive layer of the structural tape and the adhesive surface of the aluminum member are overlapped with each other. The neoprene rubber member is pressed onto the aluminum member together with the structural tape using a roller, and the adhesion between the neoprene rubber member and the aluminum member is completed.

[0032] The adhesive strength between the neoprene rubber member and the aluminum member is determined by the adhesive peeling adhesive strength test method (JI
The evaluation is based on the peel strength measured by S K 6854). Table 3 is a table showing the relationship between the peel strength between neoprene rubber and aluminum and the weight ratio of neoprene rubber adhesive and methyl ethyl ketone. Note that the peel strength indicated by the * mark in Table 3 is the value obtained when neoprene rubber and aluminum are bonded using structural tape alone.

As is clear from Table 1, the maximum peel strength between neoprene rubber and aluminum is 5.0K.
g/25 mm, which is equal to the peel strength between neoprene rubber and aluminum obtained by a conventional bonding method using only a synthetic rubber adhesive. Further, as is clear from Table 3, the peel strength between neoprene rubber and aluminum has a maximum value of 5.0 when the weight ratio of neoprene rubber adhesive and methyl ethyl ketone is 1:2.
Indicates 0Kg/25mm. Therefore, the neoprene rubber member and the aluminum member can be bonded with the same bonding strength as that obtained by the conventional bonding method using only a synthetic rubber adhesive.

[0034]

[Table 3]

Although this example shows an example of adhesion between aluminum and synthetic rubber, the method of the present invention can also be applied to adhesion between other metals and synthetic rubber. Also,
Although methyl ethyl ketone is used as the ketone solvent, methyl isobutyl ketone can also be used.

[0036]

Effects of the Invention According to the method of adhering a metal body and a synthetic rubber body of the present invention, the synthetic rubber adhesive diluted with the ketone solvent is applied to the adhesive surface of the synthetic rubber body, the ketone solvent The adhesion between the synthetic rubber body and the metal body is completed by evaporating the solvent for a short period of time and bonding the adhesive surface of the synthetic rubber body and the adhesive surface of the metal body with the structural tape. The work can be done easily and in a short time, and the efficiency of the adhesion work is high. Furthermore, since the surface layer of the adhesive surface of the synthetic rubber body is covered with the thin rubber layer, the adhesive layer of the structural tape comes into contact with the rubber layer of the adhesive surface of the synthetic rubber body. The adhesive performance is not degraded by the additives and plasticizers contained in the surface layer of the surface, and it is possible to obtain an adhesive strength that is almost the same as that obtained by an adhesive method using only a synthetic rubber adhesive.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical sectional view showing a part of a casing in which a nitrile rubber member is adhered to a side plate in an embodiment of the method of adhering a metal body and a synthetic rubber body according to the present invention.

FIG. 2 is a plan view showing an adhesive rubber sheet used in another embodiment of the method of bonding a metal body and a synthetic rubber body according to the present invention.

FIG. 3 is an enlarged view showing a cross section of the adhesive rubber sheet shown in FIG. 2;

[Explanation of symbols]

12 Side plate 18 Nitrile rubber member 22 Adhesive layer 24 Structural tape 26 Base material 28 Adhesive layer 30 Paste rubber sheet

Claims (3)

[Claims] Claim 1: A method for bonding a metal body and a synthetic rubber body to each other, the method comprising: mixing a synthetic rubber adhesive and a ketone solvent at a weight ratio of 1:m (m≧1); For structural use, a synthetic rubber adhesive diluted with a solvent is applied to the adhesive surface of the synthetic rubber body, and after the ketone solvent is volatilized, an adhesive layer is formed on both sides of the acrylic foam base material. A method of adhering a metal body and a synthetic rubber body, the method comprising attaching the adhesive surface of the synthetic rubber body and the adhesive surface of the metal body with tape. 2. The metal body according to claim 1, wherein the synthetic rubber body is made of a nitrile rubber material, and a nitrile rubber adhesive and methyl ethyl ketone are mixed in a weight ratio of 1:m (2<m<6). Adhesion method with synthetic rubber body. 3. The synthetic rubber body is made of a neoprene rubber material, and a neoprene rubber adhesive and methyl ethyl ketone are mixed in a weight ratio of 1:m (1<m<3).
A method for adhering a metal body and a synthetic rubber body as described in .