Hydrophobizing agent for mineral materials

Abstract

Described herein is a hydrophobizing agent for mineral materials, including: a polyion complex (i) including at least one polycation (i.1) and at least one polyanion (i.2), where the molar ratio of polycation:polyanion in the polyion complex is 1; and a silicone compound composition (ii). Also described herein are a process for producing the hydrophobizing agent, a method of using the hydrophobizing agent for the hydrophobizing of mineral binders and/or compositions which contain mineral binders and/or materials which include mineral binders, and a binder composition including one or more mineral binder(s) and a corresponding hydrophobizing agent. Also described herein is a process for hydrophobizing materials which include mineral binders, and a hydrophobized material including mineral binders and obtained by this process. Also described herein is a hydrophobized material which includes mineral binders, including the reaction product of one or more mineral binder(s), the hydrophobizing agent and water.

Claims

1. A hydrophobizing agent for mineral materials, comprising: i) a polyion complex comprising at least one polycation (i.1) and at least one polyanion (i.2), wherein the molar ratio of polycation:polyanion in the polyion complex is 1; ii) a silicone compound composition; and iii) a carrier composition which comprises at least one carrier selected from the group consisting of amorphous silicon dioxide, amorphous agglomerated silicon dioxide, quartz powder, limestone powder, aluminum oxide, illite, iron oxide and mixtures of two or more of these carriers, wherein the polycations (i.1) of the polyion complex (i) are present as cation part of poly-N,N-disubstituted-3,4-dimethylenepyrrolidinium chloride salts of the general formula (I): ##STR00022## wherein R.sub.1 and R.sub.2 are selected independently from the group consisting of a hydrogen atom, a C.sub.1-C.sub.18-alkyl radical and a benzyl radical; and x is the degree of polymerization; wherein the silicone compound composition (ii) comprises at least one silicone compound (ii.1) which is selected from the group consisting of monoorgano-C.sub.1-C.sub.20-trialkoysilane, diorgano-C.sub.1-C.sub.20-dialkoxysilane, poly(organo-C.sub.1-C.sub.20-alkoxysiloxane) and mixtures of two or more of these silicone compounds.

2. The hydrophobizing agent as claimed in claim 1, wherein the polyanions (i.2) of the polyion complex (i) are anion part of polycarboxylate ethers based on monounsaturated C.sub.3-C.sub.10-monocarboxylic, dicarboxylic or tricarboxylic acids.

3. The hydrophobizing agent as claimed in claim 1, wherein the polyion complex (i) has a molar ratio of polycations (i.1):polyanions (i.2) of >1.

4. The hydrophobizing agent as claimed in claim 1, wherein the polyion complex (i) has the general formula (Ib), ##STR00023## wherein: x is the degree of polymerization, y is an integer from 1 to 100, R.sub.1 and R.sub.2 are selected independently from the group consisting of a hydrogen atom, a C.sub.1-C.sub.18-alkyl radical and a benzyl radical, R.sub.3 is a hydrogen atom or a C.sub.1-C.sub.4-alkyl radical, R.sub.4 is selected from the group consisting of a hydrogen atom, a C.sub.1-C.sub.4-alkyl radical, and a CH.sub.2Z group, and Z is in each case a hydrogen atom or an N,N-disubstituted-3,4-dimethylenepyrrolidinium radical in which the positive charge on the nitrogen atom of the quaternary pyrrolidinium cation is balanced by a carboxylate anion radical, wherein the N,N-disubstituted-3,4-dimethylenepyrrolidinium has the general formula (Ia.1), ##STR00024## wherein R.sub.1, R.sub.2 and x have the meanings indicated above.

5. The hydrophobizing agent as claimed in claim 1, wherein the polyion complex (i) has a molar ratio of polycations (i.1):polyanions (i.2) of 1.

6. The hydrophobizing agent as claimed in claim 1, wherein the carrier composition (iii) comprises at least amorphous agglomerated silicon dioxide.

7. A process for producing a hydrophobizing agent comprising i) a polyion complex comprising at least one polycation (i.1) and at least one polyanion (i.2), where the molar ratio of polycation:polyanion in the polyion complex is 1; ii) a silicone compound composition; and iii) a carrier composition which comprises at least one carrier selected from the group consisting of amorphous silicon dioxide, amorphous agglomerated silicon dioxide, quartz powder, limestone powder, aluminum oxide, illite, iron oxide and mixtures of two or more of these carriers; wherein the process comprises the steps: a) providing an aqueous solution of the polyion complex (i); b) providing the carrier composition (iii); c) mixing the aqueous solution of the polyion complex (i) with the carrier composition (iii) to give a first mixture; and d) adding the silicone compound composition (ii) which optionally contains a surfactant composition and/or a UV dye composition to the first mixture obtained in (c) to give a coated pulverulent carrier composition of the hydrophobizing agent; wherein the polycations (i.1) of the polyion complex (i) are present as cation part of poly-N,N-disubstituted-3,4-dimethylenepyrrolidinium chloride salts of the general formula (I): ##STR00025## wherein R.sub.1 and R.sub.2 are selected independently from the group consisting of a hydrogen atom, a C.sub.1-C.sub.18-alkyl radical and a benzyl radical; and x is the degree of polymerization; wherein the silicone compound composition (ii) comprises at least one silicone compound (ii.1) which is selected from the group consisting of monoorgano-C.sub.1-C.sub.20-trialkoxysilane, diorgano-C.sub.1-C.sub.20-dialkoxysilane, poly(organo-C.sub.1-C.sub.20-alkoxysiloxane) and mixtures of two or more of these silicone compounds.

8. A method of using the hydrophobizing agent as claimed in claim 1, the method comprising using the hydrophobizing agent for the hydrophobizing of mineral binders and/or of compositions which contain mineral binders.

9. A binder composition comprising one or more mineral binder(s) and the hydrophobizing agent as claimed in claim 1.

10. A process for hydrophobizing materials which comprise mineral binders, comprising the steps A) providing a binder composition comprising one or more mineral binder(s); B) providing the hydrophobizing agent as claimed in claim 1; C) mixing the binder composition as per (A) and the hydrophobizing agent as per (B) to give a mixture of the binder composition and the hydrophobizing agent; and D) adding water (w) to the mixture of the binder composition and the hydrophobizing agent as obtained in (C) and mixing the components; to give a hydrophobized material comprising mineral binders.

11. A hydrophobized material comprising mineral binders and obtained by the process as claimed in claim 10.

12. A hydrophobized material which comprises mineral binders, comprising the reaction product of one or more mineral binder(s), the hydrophobizing agent as claimed in claim 1 and water.

13. The hydrophobizing agent as claimed in claim 1 wherein the polyanions (i.2) of the polyion complex (i) are anion part of polycarboxylate ethers based on monounsaturated C.sub.3-C.sub.10-monocarboxylic, dicarboxylic or tricarboxylic acids selected from the group consisting of methacrylic acid, maleic acid, methylenesuccinic acid, aconitic acid and mixtures of two or more of these acids, wherein the polyanions (i.2) are present as part of alkali metal salts or ammonium salts.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) FIG. 1 Schematic depiction of the contact angle measurement points or in-principle sketch for the determination of the contact angle of water on set cement surfaces (at left) and at different heights in the test specimen;

(2) FIG. 2 Graph of the individual measurements of the contact angles in the profile of the specimen with 2% by weight addition of powder 22 of test series 3/contact angle of water as a function of the height in the profile of the test specimen;

(3) FIG. 3 Graph of the percentage capillary water absorption based on the dry weight of the set cement of the specimens with 1.5% by weight addition of the test series 4 over time, where d is used as abbreviation for day as unit of time;

(4) FIG. 4 Averages of the contact angles of water on the surfaces of the set cement disks of test series 4 as a function of the powder used and the amount added.

(5) FIG. 5 Hydrophilicity of (Ib) indicated by attached water molecules.

LITERATURE CITED

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