JPH038832Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) The present invention relates to a metal composite gasket used for fluid sealing in the chemical industry, equipment, automobiles, ships, etc. (Prior art) Metal composite gaskets made by bonding an asbestos joint sheet and a metal plate with an adhesive are known, but the adhesive used here is chloroprene rubber, nitrile rubber, or modified phenolic resin. There are many adhesives etc. With these organic adhesives,
There is no problem in an atmosphere of about 120 to 150°C, but at high temperatures thermosetting occurs and the peel strength decreases. Metal composite gaskets have many uses that can withstand use in an atmosphere of around 200°C. Inorganic adhesives have been developed in place of organic adhesives, but they have poor adhesive workability, cracks can occur in the adhesive layer due to impact, and the adhesive layer is brittle, as well as being expensive. There is a problem. (Problems to be Solved by the Invention) In view of the above-mentioned drawbacks, the object of the present invention is to provide a metal composite gasket that has no problem in adhesion between the joint sheet and the metal plate even in an atmosphere of about 200°C. (Means for Solving Problems) The present invention is a metal composite gasket in which a joint sheet 1 and a metal plate 2 are bonded via an adhesive 3, but the adhesive 3 used here is acrylic. This is a solution in which a vulcanization accelerator is mixed into a methyl acid-ethylene copolymer elastomer, and this is dissolved in a solvent. As the vulcanization accelerator, a guanidine-based vulcanization accelerator such as methylene dianiline and diphenylguanidine, or a peroxide-based vulcanization accelerator is used. Also,
A ketone or ester solvent such as methyl ethyl ketone, ethyl acetate, toluene, acetone, or trichloroethylene is used as the solvent. Note that a filler such as carbon may be mixed into this solution. To create this adhesive, for example, 20 kg of methyl acrylate-ethylene copolymer elastomer is kneaded with 200 g of vulcanization accelerator using a roll, and this is mixed with a solvent.
Pour into 100 liters and stir to make a solution. This is diluted with a solvent before use. This solution can be diluted appropriately for ease of use, and thus can be adjusted to various viscosities. The present invention was completed by finding the above-mentioned specific adhesive. The joint sheet 1 is made of inorganic fibers such as asbestos fibers, glass fibers, carbon fibers, ceramic fibers, and mineral fibers, and/or organic fibers such as aromatic polyamide fibers, polyethylene fibers, and phenol fibers, filled with rubber materials, rubber chemicals, and filling. It is obtained by heating and press-molding the composition mixed with the agent. Further, as the metal plate 2, various metal plates such as a stainless steel plate, an iron plate, an aluminum plate, a zinc plate, and a copper plate can be used. Next, to join the joint sheet and the metal plate, the metal plate is degreased with a solvent, the adhesive characterized by the present invention is applied to the joint sheet or the metal plate, and pressure is applied. Heating, e.g. pressure 25Kgf/cm ²
Bonding is performed at a temperature of 170℃ for 15 minutes. If necessary,
Secondary vulcanization is performed at 140°C for 30 minutes. (Effects) This invention uses a copolymerized elastomer of methyl acrylate and ethylene as an adhesive, so it can withstand temperatures of approximately 200°C, and the high-temperature properties of the joint sheet and metal plate are impaired. It is possible to provide a metal composite gasket for high temperatures without any Furthermore, since this copolymer elastomer has excellent resistance to high temperature oil, the range of use of the metal composite gasket can be expanded without the joint sheet and metal plate peeling off during use. Next, Table 1 shows the results of a peel test between the metal composite gasket of the present invention and a conventional gasket. The sample is a 150mm
Make into a 20mm tanzak shape. In the heat resistance peel test, the test sample is placed in a gear aging tester, treated at a predetermined temperature and time, and cooled to room temperature in a desiccator. Visually observe the adhesion state of this sample. Next, observe the peeling state of the adhesive part between the 90° bent steel plate and the joint sheet. In the immersion peel test, the sample is placed in JIS No. 3 oil and treated at a specified temperature and time, and after being taken out, it is cooled to room temperature. Wipe off the oil adhering to this sample,
Visually observe the adhesion state. Next, observe the peeling state of the adhesive part between the 90° bent steel plate and the joint sheet.

【table】

[Table] Conventional product 1 used a phenol adhesive, and conventional product 2 used an NBR adhesive. When conventional product 1 was subjected to a bending test, the adhesive completely fell off and the product peeled off. Furthermore, in Conventional Product 2, the adhesive swelled with oil due to immersion.

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of the metal composite gasket of the present invention. Code, 1...Joint sheet, 2...Metal plate, 3...Adhesive.

Claims (1)

[Scope of utility model registration request] In a metal composite gasket in which a metal plate is bonded to a joint sheet made of a composition made of inorganic fibers and/or organic fibers, a rubber material, a rubber chemical filler, etc. through an adhesive, the adhesive includes: A metal composite gasket made by heating and joining a joint seam and a metal plate using a solution of a methyl acrylate-ethylene copolymer elastomer and a vulcanization accelerator dissolved in a solvent.