Metal-rubber laminate material
Disclosed is a metal-rubber laminate material comprising a metal plate, a rubber layer formed on the surface of the metal plate, and a solid lubricant layer formed on the rubber layer, the solid lubricant layer comprising an isocyanate group-containing urethane prepolymer, a synthetic wax having a softening point of 40 to 150° C., a fatty acid amide having a softening point of 60 to 170° C., graphite, and optionally a fluororesin. The metal-rubber laminate material, in which the metal plate and the rubber layer are bonded through a primer layer and an adhesive layer in this order, exhibits excellent effects, such as fretting resistance, when used as a metal gasket in an internal combustion engine for an automobile engine, etc.
1. A metal-rubber laminate material comprising:
a metal plate;
a rubber layer formed on the surface of the metal plate; and
a solid lubricant layer formed on the rubber layer, the solid lubricant layer formed by applying a coating agent composition as a solution or a dispersion on the rubber layer and curing the coating agent composition, wherein the solids content of the coating agent composition consists of 20 to 69 wt. % of an isocyanate group-containing urethane prepolymer, 13 to 49 wt. % of a synthetic wax having a softening point of 40 to 150° C., 13 to 50 wt. % of a fatty acid amide having a softening point of 60 to 170° C., 5 to 40 wt. % of graphite, and 0 to 50 wt. % of fluororesin, with the total amount of these components being 100 wt. %, and wherein the isocyanate group-containing urethane prepolymer is obtained by reacting a polyester polyol, polyether polyol, polycarbonate polyol or acrylic polyol with an isocyanate.
2. The metal-rubber laminate material according to claim 1 , wherein the fluororesin has a particle size of 0.5 to 5 μm.
3. The metal-rubber laminate material according to claim 1 , wherein the metal plate and the rubber layer are bonded through a primer layer and an adhesive layer.
4. The metal-rubber laminate material according to claim 3 , which is used as a metal gasket.
5. The metal-rubber laminate material according to claim 4 , which is used as a metal gasket in an internal-combustion engine.
6. The metal-rubber laminate material according to claim 5 , which is used as a metal gasket in an internal-combustion engine for an automobile engine.
7. A metal gasket for an automobile internal-combustion engine, comprising the metal-rubber laminate material according to claim 3 .