Impurity Inerting Composition

• US 20080060556A1
• Filed: 09/21/2005
• Published: 03/13/2008
• Est. Priority Date: 09/21/2004
• Status: Active Grant

• Current Assignee: Holcim Technology, Ltd. (Holcim Limited)
• Original Assignee: Lafarge SA (Holcim Limited)
• Inventors: Watt, Olivier, Jacquet, Alain, Villard, Emmanuel
• Granted Patent: US 8,834,626 B2
• Time in Patent Office: Days
• US Class Current: 106/802
• CPC Class Codes: C04B 14/06 Quartz; Sand
• CPC Class Codes: C04B 20/02 Treatment
• CPC Class Codes: C04B 20/023 Chemical treatment
• CPC Class Codes: C04B 20/1018 with organic materials pigments or dyes C04B20/1096
• CPC Class Codes: C04B 2201/10 for the viscosity
• CPC Class Codes: C04B 2201/20 for the density
• CPC Class Codes: C04B 24/2652 Nitrogen containing polymers, e.g. polyacrylamides, polyacrylonitriles
• CPC Class Codes: C04B 24/30 Condensation polymers of aldehydes or ketones
• CPC Class Codes: C08G 12/16 Dicyandiamides
• CPC Class Codes: C08G 73/0226 Quaternisation of polyalkylene(poly)amines

Abstract

The invention concerns a composition useful for inerting clays in hydraulic compositions, comprising at least 50 wt. % of a cationic polymer having a cationic charge density more than 0.5 meq/g and an intrinsic viscosity less than 1 dl/g, as active substance.

Claims

1. Composition useful for inerting clays in hydraulic compositions, comprising at least 50% by weight of a cationic polymer which has a density of cationic charges which is greater than 0.5 meq/g and an intrinsic viscosity which is less than 1 dl/g as an active substance.

2. Composition according to claim 1, wherein the cationic polymer has a density of cationic charges greater than 2 meq/g.

3. Composition according to claim 1, wherein the cationic polymer has an intrinsic viscosity less than 0.6 dl/g.

4. Composition according to claim 1, further comprising an anionic polymer.

5. Composition according to claim 4, comprising a maximum of 50% by weight of anionic polymer as an active substance.

6. Composition according to claim 1, wherein at least one of the cationic and anionic polymers has a comb structure.

7. Composition according to claim 1, wherein the cationic polymer is linear.

8. Composition according to claim 1, wherein the cationic polymer comprises cationic groups of quaternary amine.

9. Composition according to claim 1, wherein the cationic polymer is prepared by means of condensation of epichlorohydrin with a dialkylamine.

10. Composition according to claim 9, wherein the dialkylamine is dimethylamine.

11. Composition according to claim 1, wherein the anionic polymer contains carboxylic groups.

12. Composition according to claim 1, wherein the anionic polymer further comprises polyether groups.

13. Composition according to claim 1, wherein the polymer is obtainable by condensation of dicyandiamide with formaldehyde, in the presence of:

A) a polyalkylene glycol.

14. Composition according to claim 1, wherein the polymer is obtainable by condensation of dicyandiamide with formaldehyde, in the presence of:

B) a polyalkoxylated polycarboxylate.

15. Composition according to claim 1, wherein the polymer is obtainable by condensation of dicyandiamide with formaldehyde, in the presence of:

C) an ammonium derivative.

16. Composition according to claim 1, wherein the polyalkylene glycol has the following formula (I):

R²—

O—

[R¹—

O]_n—

R³

where;

R¹ is an alkyl group of C₁ to C₄;

R² and R³ are, independently of each other, a hydrogen atom or an alkyl group of C₁ to C₄; and

n is a number from 25 to 1000.

17. Composition according to claim 1, wherein the molar ratio between formaldehyde and dicyandiamide is in the range of from 0.8:

1 to 4;

1.

18. Composition according to claim 13, wherein the polyalkylene glycol is a polyethylene glycol.

19. Composition according to claim 14, wherein the polyalkoxylated polycarboxylate has the following formula (II):

20. Composition according to claim 14, wherein the polyalkoxylated polycarboxylate has an ester level of from 10 to 60%.

21. Composition according to claim 15, wherein the ammonium ion of the ammonium derivative has the following formula (IV):

NH(R⁶)₃⁺

where

the R⁶ groups are identical or different and represent H or an alkyl group of C₁ to C₆.

22. Composition according to claim 15, wherein the ammonium derivative is ammonium chloride, ammonium sulphate, ammonium iodide, ammonium bromide, ammonium acetate.

23. Composition according to claim 15, wherein the molar ratio between the compound C and the dicyandiamide is from 1 to 1.5.

24. Composition according to claim 1, characterised in that it is in the form of an aqueous solution.

25. Method for inerting clays in sands which are intended for the preparation of hydraulic compositions, comprising a step of adding to the hydraulic composition, or to one of the constituents thereof, a composition according to claim 1.

26. Method according to claim 25, wherein the hydraulic composition is a concrete or a mortar.

27. Method according to claim 25, wherein the hydraulic composition contains no superplasticiser.

28. Method according to claim 25, wherein the composition is added to the hydraulic composition or to one of the constituents thereof by means of spraying.

29. Method according to claim 25, wherein the composition is used in a quarry.

30. Method according to claim 25, wherein the composition is used in mixing plant.