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AssigneeDegussa AG
InventorsBurkhard Standke, Kerstin Weissenbach, Bernd Bartkowiak
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Aqueous oil-in-water emulsion comprising from 1 to 70% by weight, based on the total weight of the emulsion, of functional alkoxysilanes and/or condensed oligomers thereof and/or organoalkoxysiloxanes, at least one emulsifier and water, wherein the emulsion has a pH of from 5 to 9 and preferably a mean droplet size of the disperse phase of ≦0.5 μm, and the width of the droplet size distribution, expressed as the span (Formula I), is from 0.6 to 1.2. The preparation of the emulsions having the desired droplet size distribution is carried out in apparatuses having at least one pressure stage at a pressure of from 2 to 15 MPa. The emulsion can be used for hydrophobicizing porous mineral building materials.
An aqueous oil-in-water emulsion comprising from 1 to 70% by weight, based on the total weight of the emulsion, of functional alkoxysilanes and/or condensed oligomers thereof and/or organoalkoxysiloxanes, at least one emulsifier and water, wherein the emulsion has a pH of from 5 to 9 and the width of the droplet size distribution, expressed as the span
A process for preparing aqueous oil-in-water emulsions comprising from 1 to 70% by weight, based on the total weight of the emulsion, of functional alkoxysilanes and/or condensed oligomers thereof and/or organoalkoxysiloxanes, at least one emulsifier selected from among alkylsulfates having a C8-C18-alkyl radical, alkyl ether sulfates and alkaryl ether sulfates having a C8-C18-alkyl radical as hydrophobic radical and from 1 to 40 ethylene oxide (EO) or propylene oxide (PO) units, alkylsulfonates having a C8-C18-alkyl radical, alkarylsulfonates having a C8-C18-alkyl radical, monoesters of sulfosuccinic acid with monohydric alcohols or alkylphenols having from 5 to 15 carbon atoms, alkali metal and ammonium salts of carboxylic acids having from 8 to 20 carbon atoms in the alkyl, aryl, alkaryl or aralkyl radical, alkylphosphates and alkarylphosphates having from 8 to 20 carbon atoms in the organic radical, alkyl ether phosphates or alkaryl ether phosphates having from 8 to 20 carbon atoms in the alkyl or alkaryl radical and from 1 to 40 EO units, alkyl polyglycol ethers and alkaryl polyglycol ethers having from 8 to 40 EO units and from 8 to 20 carbon atoms in the alkyl or aryl radicals, ethylene oxide-propylene oxide (EO-PP) block copolymers having from 8 to 40 EO and PO units, addition products of alkylamines having C8-C22-alkyl radicals with ethylene oxide or propylene oxide, alkyl polyglycosides having linear or branched, saturated or unsaturated C8-C24-alkyl radicals and oligoglycoside radicals having from 1 to 10 hexose or pentose units, silicon-functional surfactants or mixtures of these emulsifiers and water, which comprises (i) premixing of the constituents, and, at a proportion of condensed oligomers of functional alkoxysilanes of≧25% by weight, based on the total weight of the organosilicon compounds, and (ii) emulsifying in a high-pressure homogenizer having at least one pressure stage and a pressure of from 2 to 15 MPa, so that the width of the droplet size distribution, expressed as the
A process for preparing aqueous oil-in-water emulsions comprising from 1 to 70% by weight, based on the total weight of the emulsion, of functional alkoxysilanes and/or condensed oligomers thereof and/or organoalkoxysiloxanes, at least one emulsifier selected from among alkylsulfates having a C8-C18-alkyl radical, alkyl ether sulfates and alkaryl ether sulfates having a C8-C18-alkyl radical as hydrophobic radical and from 1 to 40 ethylene oxide (EO) or propylene oxide (PO) units, alkylsulfonates having a C8-C18-alkyl radical, alkarylsulfonates having a C8-C18-alkyl radical, monoesters of sulfosuccinic acid with monohydric alcohols or alkylphenols having from 5 to 15 carbon atoms, alkali metal and ammonium salts of carboxylic acids having from 8 to 20 carbon atoms in the alkyl, aryl, alkaryl or aralkyl radical, alkylphosphates and alkarylphosphates having from 8 to 20 carbon atoms in the organic radical, alkyl ether phosphates or alkaryl ether phosphates having from 8 to 20 carbon atoms in the alkyl or alkaryl radical and from 1 to 40 EO units, alkyl polyglycol ethers and alkaryl polyglycol ethers having from 8 to 40 EO units and from 8 to 20 carbon atoms in the alkyl or aryl radicals, ethylene oxide-propylene oxide (EO-PO) block copolymers having from 8 to 40 EO and PO units, addition products of alkylamines having C8-C22-alkyl radicals with ethylene oxide or propylene oxide, alkyl polyglycosides having linear or branched, saturated or unsaturated C8-C24-alkyl radicals and oligoglycoside radicals having from 1 to 10 hexose or pentose units, silicon-functional surfactants or mixtures of these emulsifiers and water, which comprises (i) premixing of the constituents, and, at a proportion of condensed oligomers of alkoxysilanes of from 5 to <25% by weight, based on the total weight of the organosilicon compounds, (iii) pre-emulsifying in a high-pressure homogenizer having at least one pressure stage under a pressure of from 10 to 70 MPa and (ii) emulsifying in a high-pressure homogenizer having at least one pressure stage and a pressure of from 2 to 15 MPa, so that the width of the droplet size distribution, expressed as the span
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