sealant

Abstract

The present invention relates to a seal for a flanged connection, a method for making the seal and its use.

Claims

1. A sealing material for flange connection, wherein the sealing material comprises a layer of graphite foil impregnated with an impregnating material and coated with a coating material, the coating material being selected from the group consisting of fatty acid soap, mica, graphite powder, talc, and mixtures thereof.

2. A sealing material for flange connection, wherein the sealing material comprises a composite material of two or more layers of graphite foil, with reinforcing material provided between the layers of graphite foil, the outer surface of the composite material having an impregnating material and a coating material, and the coating material is selected from the group consisting of fatty acid soap, mica, graphite powder, talc, and mixtures thereof.

3. The sealing material according to claim 1 or 2, wherein the graphite foil contains expanded graphite.

4. The sealing material according to claim 1 or 2, wherein the impregnating material is selected from the group consisting of paraffin, long-chain hydrocarbons, and mixtures thereof.

5. The sealing material according to claim 2, wherein the reinforcing material is a metal insert.

6. The sealing material according to claim 5, wherein the metal insert is selected from the group consisting of sheet metal, gasket sheet, and expanded metal.

7. The sealing material according to claim 5, wherein the thickness of the metal insert is 50 μm to 150 μm.

8. The sealing material according to claim 5, wherein the metal insert is selected from the group consisting of stainless steel, steel, iron, aluminum, nickel, copper, titanium, zinc, nickel alloy, copper alloy, aluminum alloy, and zinc alloy.

9. A method for manufacturing a sealing material for flange connection, wherein the sealing material comprises a layer of graphite foil impregnated with an impregnating material and coated with a coating material, Step a, providing graphite foil, Step b provides an impregnation material and a coating material, Step c involves dispersing the coating material in the impregnation material, Step d involves applying the dispersion obtained in step c to the outer surface of the graphite foil provided in step a, A method comprising step e, which involves holding the graphite foil from step d at a temperature of 80°C to 180°C for 2 to 24 hours.

10. A method for manufacturing a sealing material for flange connection, wherein the sealing material comprises a composite material of two or more layers of graphite foil, a reinforcing material is provided between the layers of graphite foil, and the outer surface of the composite material has an impregnating material and a coating material, Step a provides graphite foil and reinforcing material, Step b provides an impregnation material and a coating material, Step c involves dispersing the coating material in the impregnation material, Step d involves applying the dispersion obtained in step c to the outer surface of the graphite foil provided in step a, thereby coating only one side of the outer surface. Step e involves holding the graphite foil from step d at a temperature of 80°C to 180°C for 2 to 24 hours. Step f involves laminating the graphite foil obtained in step e so that the coating material is present on each outer surface of the laminate and the reinforcing material is placed between the two graphite foils, A method comprising step g, which involves pressing the laminate obtained in step f to a thickness of 20% or less.

11. The method according to claim 9 or 10, wherein the impregnating material provided in step b is selected from the group consisting of paraffin, long-chain hydrocarbons, and mixtures thereof.

12. The method according to claim 9 or 10, wherein the coating material provided in step b is selected from the group consisting of fatty acid soap, mica, graphite powder, talc, and mixtures thereof.

13. The graphite foil provided in step a is 0.7 to 1.3 g / cm³ ３ The method according to claim 9 or 10, having the density of

14. The method according to claim 10, wherein the reinforcing material provided in step a is a metal insert.

15. Use of the sealing material according to any one of claims 1 to 8 for flange connections of pipes in a chemical plant.

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