Method for preparing patination materials and patination material

1. A method for preparing an artificial patination material for a copper containing substrate said method comprising: using at least one copper salt as a raw material, precipitating said raw material with an alkali metal hydroxide to form a sludge; filtering a precipitate from the formed sludge; stopping the reaction between the raw material and the alkali metal hydroxide with water; dispersing the precipitate with powerful mixing and an addition of a dispersing agent; and in addition, using both an oxidative agent and carbon as an agent for catalysing natural patina forming and at least one stable metal compound as a colour pigment for achieving a desired colour and/or colour tinge, wherein a part of the patination material is posnjakite (Cu 4 SO 4 (OH) 6 *2H 2 O) with a grain size between 0.2-80 μm.

2. A method according to claim 1 , wherein said copper salt is selected from the group consisting of copper sulfate, copper nitrate, copper chloride, and copper carbonate.

3. A method according to claim 1 , wherein said copper salt is copper sulfate.

4. A method according to claim 1 , wherein said oxidative agent is manganese dioxide.

5. A method according to claim 1 , wherein said raw material includes an iron compound.

6. A method according to claim 1 , wherein said oxidative agent is an iron compound.

7. A method according to claim 1 , wherein said colour pigment is an inorganic metal compound.

8. A method according to claim 1 , wherein said colour pigment is an iron compound.

9. A method according to claim 1 , wherein said colour pigment is an iron and aluminum compound, an iron, manganese, and aluminum compound, or an iron, manganese, silicon and aluminum compound.

10. A method according to claim 1 , wherein said colour pigment is a manganese compound.

11. A method according to claim 1 , wherein said colour is a copper compound.

12. A method according to claim 11 , wherein said colour pigment is a copper carbonate compound, a copper silicate-copper carbonate compound, or a calcium copper silicate compound.

13. A method according to claim 1 , wherein said colour pigment is a chromium (III) compound.

14. A method according to claim 1 , wherein said colour pigment is a magnesium- aluminum- and potassium compound.

15. A method according to claim 1 , wherein said colour pigment is coal.

16. A method according to claim 1 , wherein the amount of the colour pigment in the patination material dry matter is no more than 5%.

17. A method according to claim 1 , further comprising using an alkyd-based compound as a binder and adding the binder to the patination material during its preparation.

18. A method according to claim 17 , wherein the amount of the binder is no more than 10% of the patination material dry matter.

19. A method according to claim 1 , wherein the amount of dry matter in the patination material is between 15-50%.

20. An artificial patination material for copper containing substrates wherein at least one copper salt is used as a raw material, precipitated with an alkali metal hydroxide and the formed sludge filtered for forming a precipitate paste, wherein the reaction between the raw material and the alkali metal hydroxide was stopped with water, the precipitate dispersed with powerful mixing and an addition of a dispersing agent, and the paste contains an oxidative agent and carbon for catalysing natural patina forming and at least one stable metal compound is used as a color pigment for achieving desired color and/or color tinge, wherein a part of the patination material is posnjakite (Cu 4 SO 4 (OH) 6 *2H 2 O) with a grain size between 0.2-80 μm.

21. A patination material according to claim 20 , wherein an alkyd-based compound is used as a binder.

22. A patination material according to claim 21 , wherein the binder covers only partially the patination material particles.

23. A patination material according to claim 21 , wherein the amount of the binder is no more than 10% of the patination material dry matter.

24. A patination material according to claim 20 , wherein said copper salt is selected from the group consisting of copper sulfate, copper nitrate, copper chloride, and copper carbonate.

25. A patination material according to claim 20 , wherein said copper salt is copper sulfate.

26. A patination material according claim 20 , wherein a grain size of the patination material particles is between 0.2-100 μm.

27. A patination material according to claim 20 , wherein the amount of dry matter in the patination material is between 15-50%.

28. A patination material according to claim 20 , wherein said color pigment is an inorganic metal compound.

29. A patination material according to claim 20 , wherein said color pigment is an iron compound.

30. A patination material according to claim 20 , wherein said color pigment is an iron and aluminum compound, an iron, manganese and aluminum compounds or an iron, manganese, silicon and aluminum compound.

31. A patination material according to claim 20 , wherein said color pigment is a manganese compound.

32. A patination material according to claim 20 , wherein said color pigment is a copper compound.

33. A patination material according to claim 32 wherein said color pigment is a copper carbonate compound, a copper silicate-copper carbonate compound or a calcium copper silicate compound.

34. A patination material according to claim 20 , wherein said color pigment is a chromium(III) compound.

35. A patination material according to claim 20 , wherein said color pigment is a magnesium, aluminum and calcium compound.

36. A patination material according to claim 20 , wherein said color pigment is coal.

37. A patination material according to claim 20 , wherein the storage time of the artificial patination material is several months.

38. A patination material according to claim 20 , wherein the paste is storable in room temperature.

39. A patination material according to claim 20 , wherein the amount of the color pigment is no more than 5% of the patination material dry matter.