Process for the preparation of surface-treated calcium carbonate material and use of same in the control of organic material in an aqueous medium
The present invention relates to a process for the production of a surface-treated calcium carbonate, the use of this surface-treated calcium carbonate in a process for the control of organic material in an aqueous medium, as well as to a composite of surface-treated calcium carbonate and organic material, such as a composite of surface-treated calcium carbonate and to the use of such a composite.
1. A process for the preparation of a surface-treated calcium carbonate material comprising the following steps:
a) providing at least one calcium carbonate-containing material;
b) providing at least one salt of a C 5 -C 28 fatty acid(s) selected from the group consisting of (i) a mono-alcohol primary alkanolamine salt of a C 5 -C 28 fatty acid(s), (ii) a polyethyleneimine salt of a C 5 -C 28 fatty acid(s), and (iii) a mixture thereof; and
c) treating the calcium carbonate-containing material of step a) with 0.1 to 3 wt. % of the fatty acid salt(s) of step b), based on the dry weight of the calcium carbonate-containing material, to obtain a surface-treated calcium carbonate material.
2. The process according to claim 1 , wherein the calcium-carbonate containing material of step a) comprises ground natural calcium carbonate, dolomite, precipitated calcium carbonate or any mixture thereof.
3. The process according to claim 1 , wherein the calcium-carbonate containing material of step a) contains at least 50% by weight of calcium carbonate relative to the total weight of the calcium-carbonate containing material.
4. The process according to claim 1 , wherein the calcium-carbonate containing material of step a) contains at least 90% by weight of calcium carbonate relative to the total weight of the calcium-carbonate containing material.
5. The process according to claim 1 , wherein 10 to 90% by weight of calcium carbonate material of step a) have a particle diameter of less than 1 μm.
6. The process according to claim 1 , wherein 30 to 85% by weight of calcium carbonate material of step a) have a particle diameter of less than 1 μm.
7. The process according to claim 1 , wherein 60 to 80% by weight of calcium carbonate material of step a) have a particle diameter of less than 1 μm.
8. The process according to claim 1 , wherein the calcium carbonate material of step a) has a d 50 value of from 0.4 to 5 μm.
9. The process according to claim 1 , wherein the calcium carbonate material of step a) has a d 50 value of from 0.5 to 1 μm.
10. The process according to claim 1 , wherein the calcium carbonate material of step a) has a BET specific surface area of 1 to 200 m 2 /g.
11. The process according to claim 1 , wherein the calcium carbonate material of step a) has a BET specific surface area of 7 to 15 m 2 /g.
12. The process according to claim 1 , wherein the calcium carbonate material of step a) is provided in the form of an aqueous suspension.
13. The process according to claim 1 , wherein the calcium carbonate material of step a) is provided in the form of an aqueous suspension having 1 wt.-% to 79 wt.-% of the calcium carbonate material based on the weight of the suspension.
14. The process according to claim 1 , wherein the calcium carbonate material of step a) is provided in the form of an aqueous suspension having 3 wt.-% to 78 wt.-% of the calcium carbonate material based on the weight of the suspension.
15. The process according to claim 1 , wherein the calcium carbonate material of step a) is provided in the form of an aqueous suspension having 55 wt.-% to 75 wt.-% of the calcium carbonate material based on the weight of the suspension.
16. The process according to claim 1 , wherein the calcium carbonate material of step a) comprises 0.05 to 1 mg dispersant or grinding aid per m 2 of calcium-carbonate containing material.
17. The process according to claim 1 , wherein the salt of a C 5 -C 28 fatty acid(s) is a salt of a C 6 -C 24 fatty acid.
18. The process according to claim 1 , wherein the salt of a C 5 -C 28 fatty acid(s) is a salt of a C 8 -C 18 fatty acid.
19. The process according to claim 1 , wherein the salt of a C 5 -C 28 fatty acid(s) has an iodine number of less than 5 g I 2 /100 g of fatty acid salt.
20. The process according to claim 1 , wherein the salt of a C 5 -C 28 fatty acid(s) is a salt of a linear fatty acid if the fatty acid is a C 6 -C 9 fatty acid.
21. The process according to claim 1 , wherein the salt of a C 5 -C 28 fatty acid(s) is a blend of palmitic acid salt(s) and stearic acid salt(s).
22. The process according to claim 1 , wherein the salt of a C 5 -C 28 fatty acid(s) is a blend of palmitic acid salt(s) and stearic acid salt(s) in a weight ratio of palmitic acid : stearic acid of 2:1 to 1:2.
23. The process according to claim 1 , wherein the salt of a C 5 -C 28 fatty acid(s) is a C 5 -C 28 fatty acid 30 to 110 mole % neutralized with a mono-alcohol primary alkanolamine and/or a polyethyleneimine.
24. The process according to claim 1 , wherein the salt of a C 5 -C 28 fatty acid(s) is a C 5 -C 28 fatty acid 35 to 45 mole % neutralized with polyethyleneimine.
25. The process according to claim 1 , wherein the salt of a C 5 -C 28 fatty acid(s) is a C 5 -C 28 fatty acid 90 to 100 mole % neutralized with a mono-alcohol primary alkanolamine.
26. The process according to claim 1 , wherein the salt of a C 5 -C 28 fatty acid(s) is a polyethyleneimine salt of a C 5 -C 28 fatty acid(s), wherein the polyethyleneimine is a linear polyethyleneimine having a molecular weight of from 140 to 700 g/mol.
27. The process according to claim 1 , wherein the salt of a C 5 -C 28 fatty acid(s) is a polyethyleneimine salt of a C 5 -C 28 fatty acid(s), wherein the polyethyleneimine is a linear polyethyleneimine having a molecular weight of from 146 to 232 g/mol.
28. The process according to claim 1 , wherein the salt of a C 5 -C 28 fatty acid(s) is a monoalcohol primary alkanolamine salt of a C 5 -C 28 fatty acid(s).
29. The process according to claim 28 , wherein the monoalcohol primary alkanolamine is ethanolamine, propanolamine, butanolamine, pentanolamine or any mixture thereof.
30. The process according to claim 1 , wherein the salt of a C 5 -C 28 fatty acid(s) is a 1-amino-2-propanol salt of a C 5 -C 28 fatty acid.
31. The process according to claim 1 , wherein the calcium carbonate material is treated with a total of 0.5 to 2 wt. % of the salt(s) of the C 5 -C 28 fatty acid(s), based on the dry weight of the calcium carbonate-containing material.
32. The process according to claim 1 , wherein the calcium carbonate material is treated with a total of 0.2 to 5 mg of the salt(s) of the C 5 -C 28 fatty acid(s) per m 2 of calcium carbonate-containing material.
33. The process according to claim 1 , wherein the calcium carbonate material is treated with a total of 0.5 to 2 mg of the salt(s) of the C 5 -C 28 fatty acid(s) per m 2 of calcium carbonate-containing material.
34. The process according to claim 1 , wherein step c) is a wet treatment process and the surface-treated calcium carbonate so obtained is dried to obtain surface-treated calcium carbonate in the form of granules or a powder.
35. The process according to claim 1 , wherein step c) is a dry treatment process and the surface-treated calcium carbonate so obtained is introduced into an aqueous medium to obtain an aqueous suspension of surface-treated calcium carbonate.