JP2001170944A - Method of manufacturing vibration-proof rubber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a vibration-proof rubber suitable for manufacturing a heat-resistant dynamic damper or the like not generating a problem of the adhesion interfacial peeling of a metal and rubber even in use under high temperature environment and used in a high temperature engine room or the like. SOLUTION: An undercoat adhesive and a topcoat adhesive are successively applied to a metal and an unvulcanized rubber is brought into contact with the coated metal and heated under pressure to be bonded to the metal simultaneously with vulcanization to produce a vibration-proof rubber. As the undercoat adhesive, an undercoat adhesive containing no halogenated polymer is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an anti-vibration rubber, and more particularly to a two-component adhesive coating method for vulcanizing rubber, particularly in a high-temperature environment by simultaneous vulcanization of metal and rubber. To manufacture a dynamic damper to be manufactured.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing a metal-rubber composite product, a metal and an unvulcanized rubber are heated and pressed through an adhesive to vulcanize the rubber and simultaneously bond the rubber and the metal. There is a manufacturing method by an adhesion method.

[0003] Such a vulcanization bonding method between rubber and metal generally includes an adhesive one-component coating method using one adhesive, an undercoat adhesive applied as a primer on the metal surface, and then a topcoat adhesive. There is an adhesive two-component coating system for applying an agent, and the two-component coating system is widely used for simultaneous vulcanization of general-purpose rubber and metal. In the case of the two-pack coating method, the top coat adhesive is mainly composed of a halogenated polymer such as chlorinated natural rubber, chlorinated polyethylene, or chlorosulfonated polyethylene, or a mixture of these halogenated polymers. A compound containing a polymer having excellent film properties or a crosslinking agent is generally used. On the other hand, as the undercoat adhesive, the main component is a phenolic resin for securing adhesion to various metals, and in order to achieve good adhesion with the overcoat adhesive, the same as the main component of the overcoat adhesive A compound containing a halogenated polymer is used.

[0004] By the way, near the engine of a car or the like,
A dynamic damper provided as an anti-vibration rubber is required to have high heat resistance because it is exposed to an extremely high temperature environment due to heat generated by rotation of an engine. Although the degree of heat resistance varies depending on the user,
In some cases, a dynamic damper that can withstand use at an extremely high temperature of about 200 ° C. is required.

[0005] In order to ensure heat resistance at such an ultra-high temperature, the rubber material itself has heat resistance, does not cause molecular chain destruction even at high temperatures, and has a sufficient bonding strength between the rubber and the metal. It is desired that the adhesive interface has excellent heat resistance and does not cause peeling of the adhesive interface even in a high temperature environment.

[0006]

Conventionally, heat-resistant rubbers such as EPDM have been developed as rubber materials, but sufficient measures have not been taken against peeling of the adhesive interface, and unvulcanized rubber and various metals have been developed. When a metal-rubber composite product joined by applying a conventional two-component coating type vulcanizing adhesive is used in a high-temperature environment of 100 ° C. or more, peeling of the adhesive interface occurs between rubber and metal. I have.

The present invention solves the above-mentioned conventional problems, and has no problem of peeling off the adhesive interface between metal and rubber even when used in a high temperature environment, and has a heat resistant dynamic damper and the like used in a high temperature engine room. It is an object of the present invention to provide a method for producing a vibration-proof rubber suitable for the production of rubber.

[0008]

According to the present invention, there is provided a method for producing a vibration-proof rubber, comprising: vulcanizing a rubber by heating and pressing a metal and an unvulcanized rubber via an adhesive; A method of manufacturing a vibration-proof rubber by bonding a base coat adhesive to a metal as the adhesive, and then applying a top coat adhesive, wherein halogen is used as the base coat adhesive. It is characterized by using an adhesive not containing.

That is, the present inventors have made intensive studies to prevent the peeling of the adhesive interface between rubber and metal in a high-temperature environment. As a result, the peeling of the adhesive interface was caused by the peeling between the rubber and the topcoat adhesive. (RC peeling) and peeling between the metal and the undercoat adhesive. The peeling between the rubber and the topcoat adhesive can be improved by adjusting the rubber compounding. It has been found that separation between layers cannot be prevented by the prior art. As a result of further study on the cause of peeling between the metal and the undercoat adhesive, the halogen compound generated from the halogenated polymer which is a main component of the overcoat adhesive permeated through the undercoat adhesive under high temperature conditions and leached out. The weakening of the adhesive strength between the metal / priming adhesive by reaching between the metal / priming adhesive is a cause of the peeling between the metal / priming adhesive. By using an adhesive that does not contain, the penetration of the halogen compound from the top-coating adhesive is prevented, thereby preventing the peeling of the bonding interface between the metal and the undercoating adhesive, and dramatically improving the high-temperature adhesion resistance. And completed the present invention.

[0010] In the present invention, as the overcoating adhesive,
An adhesive containing a halogenated polymer is used. Also,
EPDM (ethylene-ethylene) which is particularly excellent in heat resistance as rubber
Synthetic rubbers such as propylene-diene rubber) are preferred;
As the metal, steel, stainless steel or an aluminum alloy is preferable.

The method of the present invention is suitable for manufacturing a dynamic damper, particularly a dynamic damper used in a high temperature environment such as an engine room.

[0012]

Embodiments of the present invention will be described below.

In the present invention, an undercoat adhesive is first applied to the surface of the metal constituting the vibration-proof rubber to be bonded with rubber, and then an overcoat adhesive is applied, and an unvulcanized rubber is brought into contact with the adhesive applied surface. Heat and press.

In the present invention, the undercoat adhesive includes:
There is no particular limitation as long as it does not contain a halogen, and specifically, "METALLOK PH-50" and "METALLOK P" manufactured by Toyo Chemical Laboratory, which do not contain a halogenated polymer.
A3375 "or the like can be used. Such an undercoat adhesive is diluted with a suitable solvent such as methyl ethyl ketone or acetone as required, and applied to a metal surface.

By using an adhesive containing no halogen element, particularly chlorine, as the undercoat adhesive, the halogen compound of the overcoat adhesive weakens the adhesion between the undercoat adhesive and the metal, thereby peeling the adhesive interface between the rubber and the metal. Can be effectively prevented, but if the applied film thickness of the undercoat adhesive is too thin, the halogen compound generated from the halogenated polymer which is the main component of the overcoat adhesive will not reach the undercoat adhesive-metal interface. Since it is difficult to shield, the coating thickness of the undercoat adhesive is preferably 1 μm or more on average, more preferably 2 μm or more, particularly preferably 5 μm or more.

It is to be noted that even if the coating film thickness is excessively large, there is no difference in the effect, and the cost is unnecessarily increased, so that the coating film thickness of the undercoat adhesive is preferably 30 μm or less.

As the top coat adhesive to be applied on the under coat adhesive, a halogenated polymer adhesive conventionally used generally as the top coat adhesive, for example, "Chemrock 252" manufactured by Road Co., Ltd. Sixon 5
11-T "," Sixson DSN-11 "and the like.

The coating thickness of the top coat adhesive is preferably about 5 to 30 μm from the viewpoint of adhesive strength and economy.

In the present invention, prior to the application of the adhesive, the metal surface is subjected to an appropriate cleaning treatment such as a blast treatment or a degreasing treatment with an organic solvent to remove rust, oil, moisture, dirt and the like in advance. It is preferable to keep it.

After the undercoat adhesive and the overcoat adhesive are applied to the metal, the unvulcanized rubber is brought into contact with the metal and heated and pressed to vulcanize the rubber and bond the metal and the rubber.

The heating and pressurizing conditions are appropriately determined depending on the vulcanization temperature of the rubber and the like.
C. and 0.5 to 10 MPa for about 5 to 200 minutes.

In the present invention, the metal to which the rubber is bonded is not particularly limited, and examples thereof include steel, SUS, brass, aluminum, and alloys thereof.

The rubber is not particularly limited, and may be natural rubber, various synthetic rubbers, or a blended rubber obtained by mixing two or more of these rubbers. Synthetic rubbers such as EPDM are often used for heat resistance. Can be These rubbers are applied as a rubber composition in which ordinary rubber additives such as carbon black, an antioxidant, a crosslinking agent and the like are compounded.

The method of the present invention can be applied to a vibration damping rubber requiring various heat-resistant adhesive properties such as a dynamic damper and a torsional damper installed in an engine room of an automobile, and rubber parts installed near an exhaust system. It is extremely effective in the production, and the vibration-proof rubber can be easily and efficiently produced according to the conventional production method only by selecting the undercoat adhesive.

[0025]

The present invention will be described more specifically below with reference to examples and comparative examples.

Example 1 Metal piece of 25 mm × 60 mm × 2.3 mm: steel (SP
CC) is degreased and washed with an organic solvent, and the surface is subjected to dry blasting to remove rust. Then, "Metaloc PH-50" containing no halogenated polymer as an undercoat adhesive (manufactured by Toyo Chemical Laboratory) ) Was applied. The coating film thickness was 15 μm on average. After drying the undercoat adhesive, “Chemrock 252” is used as the overcoat adhesive.
(Manufactured by Lord Co.) was applied to a coating thickness of 15 μm and dried.

A metal piece coated with an adhesive and a synthetic rubber (E
PDM) is laminated with an unvulcanized rubber made of a rubber composition in which carbon black, a cross-linking agent, etc. are compounded.
Adhesion test specimens conforming to JIS K6256 were produced by heating and pressing under the conditions of 5 MPa and 60 minutes to perform simultaneous vulcanization adhesion.

The test piece was given a heat history at 190 ° C. for 1 hour, 5 hours, and 10 hours, respectively, cooled, and subjected to a 90-degree peel test specified in JIS to check the failure mode of the bonded surface. The results are shown in Table 1.

Examples 2 and 3 In Example 1, the undercoat adhesive "METALLOK PH-5" was used.
"0" was diluted with a solvent (methyl ethyl ketone), and vulcanization simultaneous adhesion was performed in the same manner except that the coating film thickness shown in Table 1 was obtained. A peeling test was similarly performed, and the results are shown in Table 1.

Example 4 In Example 1, vulcanization simultaneous bonding was carried out in the same manner as in Example 1, except that "Metaloc PA3375" (manufactured by Toyo Chemical Laboratories) containing no halogenated polymer was used as the undercoat adhesive. A peel test was performed and the results are shown in Table 1.

Examples 5 and 6 In Examples 2 and 3, steel (SPCC) was used as the metal piece.
Instead of aluminum alloy (A5052)
Vulcanization simultaneous bonding is performed in the same manner except that
Similarly, a peeling test was performed, and the results are shown in Table 1.

Comparative Example 1 Example 1 except that “Chemrock 205” (manufactured by Lord Co.) containing a halogenated polymer was used as the undercoat adhesive.
The vulcanization simultaneous adhesion was carried out in the same manner as described above, and the peel test was carried out in the same manner. The results are shown in Table 1.

Comparative Example 2 "Sixon" containing a halogenated polymer in an undercoat adhesive
The same vulcanization simultaneous adhesion was carried out in the same manner as in Example 1 except that 9546 (manufactured by Morton) was used, and a peeling test was carried out in the same manner. The results are shown in Table 1.

[0034]

[Table 1]

From Table 1, it can be seen that according to the present invention, peeling of the adhesive interface under high-temperature conditions can be prevented, and high heat-resistant adhesive durability can be obtained.

[0036]

As described above in detail, according to the method for producing a vibration-proof rubber of the present invention, even when exposed to a high-temperature environment, the adhesive interface does not peel off and has high heat-resistant adhesive durability. Can easily be manufactured.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29L 9:00 B29L 9:00 F term (Reference) 3J048 AA01 BA19 BB03 BB10 EA01 4F100 AB01A AB03A AB04A AB10A AB31A AK75B AN00B BA02 BA10A BA10B CB00 EC052 EG001 EH461 EJ062 EJ202 EJ261 EJ422 EJ861 GB32 GB51 JA20G JJ03 JK06 JL00 YY00G 4F203 AA45 AD03 DA11 DB01 DB11 DC01 DJ06 DK01

Claims (6)

[Claims] 1. A method for producing a vibration-proof rubber by vulcanizing a rubber by heating and pressing a metal and an unvulcanized rubber via an adhesive, and bonding the rubber and the metal. A method for producing a vibration-proof rubber in which an undercoat adhesive is applied to a metal and then a top-coat adhesive is applied as the adhesive, wherein a halogen-free adhesive is used as the undercoat adhesive. Production method. 2. The method according to claim 1, wherein the applied film thickness of the undercoat adhesive is 2 μm or more. 3. The method according to claim 1, wherein the overcoat adhesive is an adhesive containing a halogenated polymer. 4. The method according to claim 1, wherein the rubber is EPDM. 5. The method according to claim 1, wherein the metal is steel, stainless steel, or an aluminum alloy. 6. The method of manufacturing a vibration-proof rubber according to claim 1, wherein the vibration-proof rubber is a dynamic damper.