Inerting clay minerals and improving the effect of liquefiers in clay-containing mineral binder compositions

Patent metadata

Field	Value
Publication number	US-11021398-B2
Application number	US-201615771356-A
Country	US
Kind code	B2
Filing date	Oct 25, 2016
Priority date	Oct 26, 2015
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

The use of an amine compound and/or of a salt of the amine compound to inert clay minerals with respect to dispersants in a mineral binder composition containing clay minerals and/or to improve or increase the effect of a dispersant in a mineral binder composition containing clay minerals, wherein the amine compound has a structure according to formula I:

H 2 N—(CHR 21 ) e —[NR 22 —(CHR 23 ) f ] s —[NR 24 —(CHR 25 ) g ] t —NH 2   (I)

and wherein: each s and t, independently of each other, has a value of 0-2; each e, f, and g, independently of each other, has a value of 2-10; each R 21 , R 22 , R 23 , R 24 , and R 25 , independently of each other, represents hydrogen or —CH 3 .

First claim

The invention claimed is:

1. A method comprising utilizing an amine compound and/or a salt of the amine compound, where the salt of the amine compound is not a salt of the amine compound with a dicarboxylic acid, to render clay minerals inert to dispersants in a mineral binder composition comprising clay minerals and/or to improve the effect of a dispersant in a mineral binder composition comprising clay minerals, wherein
the amine compound has a structure according to formula I:
H 2 N—(CHR 21 ) e —[NR 22 —(CHR 23 ) f ] s —[NR 24 —(CHR 25 ) g ] t —NH 2   (I)

and wherein
each s and t, in each case independently of one another, has a value of 0-2;
each e, f and g, in each case independently of one another, has a value of 2-10;
each R 21 , R 22 , R 23 , R 24 and R 25 , in each case independently of one another, is hydrogen or —CH 3 ; and

the amine compound comprises at least one representative from the group consisting of bis(hexamethylene)triamine and 1,6-diaminohexane.

2. The method as claimed in claim 1 , wherein the amine compound is used in an amount of 0.01-10 wt % based in each case on the mineral binder content.

3. The method as claimed in claim 1 , wherein the dispersant is selected from the group encompassing sulfonated vinyl copolymers, lignosulfonates, sulfonated naphthalene-formaldehyde condensates, sulfonated melamine-formaldehyde condensates, polycarboxylates and/or polycarboxylate ethers.

4. The method as claimed in claim 3 , wherein the dispersant comprises a polycarboxylate ether.

5. The method as claimed in claim 1 , wherein the binder composition comprises clay-containing aggregates.

6. An admixture for improving the effect of a dispersant in a mineral binder composition comprising an amine compound, the amine compound being present at least partly in the form of a salt, where the salt of the amine compound is not a salt of the amine compound with a dicarboxylic acid; wherein
the amine compound has a structure according to formula I:
H 2 N—(CHR 21 ) e —[NR 22 —(CHR 23 ) f ] s —[NR 24 —(CHR 25 ) g ] t —NH 2   (I)

where
each s and t, in each case independently of one another, has a value of 0-2; each e,f and g, in each case independently of one another, has a value of 2-10; each R 21 , R 22 , R 23 , R 24 and R 25 , in each case independently of one another, is hydrogen of −CH 3 ;
the amine compound comprises at least one representative from the group consisting of 1,5-diamino-2-methylpentane (DAMP), 1,6-diaminohexane, 1,8-diaminooctane, triethylenetetramine (TETA), tetraethylenepentamine (TEPA), pentaethylenehexamine (PEHA), and bis(hexamethylene)-triamine; and
the salt of the amine compound comprises an acetic and/or formic acid salt of bis(hexamethylene)triamine.

7. A method comprising adding the admixture of claim 6 to a mineral binder in an amount effective to improve the effect of a dispersant comprised therein.

8. A cured binder composition obtained by mixing the admixture as claimed in claim 6 with water and least one mineral binder and then curing it.

Assignees

• Sika Tech Ag

Inventors

• Marazzani Beat
• Colaiacovo Giuseppe
• Bürge Christian
• Wombacher Franz

Classifications

• C04B24/121 Primary

  Amines, polyamines · CPC title

• C04B2103/408

  Dispersants · CPC title

• C04B40/0039

  Premixtures of ingredients · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title

• C04B28/001 Primary

  containing unburned clay (polymer binder - clay mixtures used in well cementing C09K8/44) · CPC title