WO2006114154A1 - Agents de revetement de materiaux de construction aqueux, contenant des composes de silicium organique glycofonctionnels - Google Patents

Agents de revetement de materiaux de construction aqueux, contenant des composes de silicium organique glycofonctionnels Download PDF

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Publication number
WO2006114154A1
WO2006114154A1 PCT/EP2006/002177 EP2006002177W WO2006114154A1 WO 2006114154 A1 WO2006114154 A1 WO 2006114154A1 EP 2006002177 W EP2006002177 W EP 2006002177W WO 2006114154 A1 WO2006114154 A1 WO 2006114154A1
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Prior art keywords
glycol
building material
material coating
water
radical
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PCT/EP2006/002177
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German (de)
English (en)
Inventor
Christian Putz
Frank Sandmeyer
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Wacker Chemie Ag
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Publication of WO2006114154A1 publication Critical patent/WO2006114154A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
    • C04B41/49—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes
    • C04B41/4905—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes containing silicon
    • C04B41/495—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes containing silicon applied to the substrate as oligomers or polymers
    • C04B41/4961—Polyorganosiloxanes, i.e. polymers with a Si-O-Si-O-chain; "silicones"
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated

Definitions

  • Aqueous building material coating compositions containing glycol-functional organosilicon compounds containing glycol-functional organosilicon compounds
  • the present invention relates to aqueous building material coating compositions which contain, in addition to organic polymer, glycol-functional organosilicon compounds.
  • Aqueous building material coating compositions are dispersions based on water as a continuous phase and, after setting, a coating on a building material substrate,. like facade or fence form. Often the
  • EP 791 566 A describes water-repellent impregnating agents which comprise alkoxysilane and optionally alkoxy-functional organopolysiloxanes for use as impregnating agents for mineral building materials.
  • the impregnating agent can also be used in top coats for the corresponding Untergünde, wherein the impregnating agents in question are added to the building material coating, so serve as an additive additive to the water-repellent finish of the building material coating agent.
  • Building material coating agents are paints and plasters.
  • EP 824 510 A1 describes non-cementitious coating compositions which form porous mineral building coatings and are selected from mineral paints, silicone resin emulsion paints and plasters, Dispersion silicate paints, coating fillers, reinforcing compositions and primers containing an aqueous emulsion containing alkylalkoxysilane, alkoxy-functional organopolysiloxanes, amine-functional organopolysiloxanes and emulsifier.
  • EP 1 034 209 A describes aqueous silicone dispersions for the formulation of paints which contain hydroxy-functional polyorganosiloxane resins which have a defined T / (M + D + T + Q) ratio and, among various other constituents, also an emulsifier.
  • EP 1 256 611 A claims an aqueous dispersion which contains siloxanes which are formed by hydrolysis and condensation of alkoxysilanes.
  • the silanes used are alkyl or arylalkoxysilanes, it being possible for up to three alkoxy groups bonded to silicon to be present. From this, alkyl or aryl resins or corresponding alkyl or aryl-containing resinous oligomers are accessible by hydrolysis and condensation.
  • the dispersions contain emulsifiers which keep the siloxanes homogeneously dispersed.
  • the dispersion may be used as a binder, e.g. be used for colors and gives the color special weathering stability.
  • EP 1 197 502 A teaches the preparation of an aqueous resin emulsion by radical polymerization of free-radically crosslinkable organic monomers in the presence of hydrolyzable and condensable mono-, di or Trialkoxyalkyl- or -arylsilanen, which are not free-radically polymerizable, wherein the silanes hydrolyzed simultaneously to free-radical polymerization and be condensed.
  • corresponding aryl and alkyl siloxanes are present in the resin emulsion.
  • the siloxanes are stabilized in their dispersed state by emulsifiers.
  • the Resin emulsions can be used as binders, for example for paints.
  • the above building material coating agents require a significant amount of emulsifier to incorporate the organosilicon compounds into the aqueous building coating agents.
  • the emulsifiers must first be washed after application on the building material before the building material coating unfolds their full hydrophobicity, especially a good beading effect and low water absorption.
  • the invention relates to aqueous building coating materials which contain
  • the glycol-functional organosilicon compound SG are used as a hydrophobizing additive in the building-material coating composition and impart water-repellent properties to the coatings. They also prevent effectively that water penetrates into the underlying substrate, such as the silicone resin binders commonly used, which are used as an emulsion and they cause an equally rapid formation of the beading effect, as the otherwise used hydrophobizing additives, which are also used as an emulsion.
  • the glycol-functional organosilicon compound SG can be used as emulsifier-free aqueous solutions in order to solve them clearly or homogeneously in the aqueous
  • glycol-functional organosilicon compound SG unlike the conventional hydrophobizing additives, which are substantially non-crosslinkable oils and therefore exude, form a solid and permanent network or already have a network structure.
  • the networked structures remain permanently in the surface. They lead to a reduction in the susceptibility to fouling of the coating during exposure. They are therefore not washable and reduce the otherwise observed with the oil-based Hydrophobieradditiven pollution tendency.
  • the glycol-functional organosilicon compound SG may be a siloxane and is preferably composed of at least 50 mol% of units of the general formula 1,
  • R is a monovalent, optionally halogen-substituted C 1 -C 5 -hydrocarbon radical
  • R 1 is a monovalent C 1 -C 5 -alkyl hydrocarbon radical or a hydroxy radical
  • G is a monovalent or bivalent branched or linear, optionally interrupted by non-adjacent oxygen atoms C, j_-C25-glycol radical, a, b are the values 0, 1, or 2, c are the values 0, 2 or 3, d, e Values 0, 1, 2 or 3 and c + d + e at most 3, with the proviso that at least 20 mol% of the units of the general formulas 1 and
  • glycol-functional organosilicon compound SG can also be a silane and preferably has the general formula 3
  • R, R 1 - and G have the above meanings, f is 0, 1, or 2 and g is 1, 2 or 3.
  • Ci-Cs hydrocarbon radicals R are alkyl radicals, such as the methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, tert. Butyl, n-pentyl, iso-pentyl, neo-pentyl, tert.
  • -Pentyl radical Hexyl radicals, such as the n-hexyl radical; Heptyl radicals, such as the n-heptyl radical; Octyl radicals, such as the n-octyl radical and iso-octyl radicals, such as the 2, 2, 4-trimethylphenyl radical; Alkenyl radicals, such as the vinyl and the allyl radical, - cycloalkyl radicals, such as cyclopentyl, cyclohexyl, Cycloheptyl radicals and methylcyclohexyl radicals; Aryl radicals, such as the phenyl radical; Alkaryl radicals, such as o-, m-, p-tolyl radicals, xylyl radicals and ethylphenyl radicals; Aralkyl radicals, such as the benzyl radical, the alpha- and the 3-phenylethyl radical.
  • halogen-substituted C 1 -C 8 -hydrocarbon radicals are alkyl radicals substituted by fluorine, chlorine, bromine and iodine atoms, such as the 3, 3, 3-trifluoro-n-propyl radical, which is 2,2,2,2 ', 2' ⁇ 1- hexafluoroisopropyl radical, the heptafluoroisopropyl radical, and haloaryl radicals, such as the o-, m- and p-chlorophenyl radicals.
  • Examples of the C ⁇ -cis-hydrocarbonoxy are the above C] _-Cg-hydrocarbon radicals which are bonded via a divalent oxygen atom to the silicon atom.
  • the unsubstituted C ⁇ -Cg-alkoxy radicals in particular the methoxy and the ethoxy and the propoxy radicals, are preferred.
  • Examples of branched or linear C 1 -C 25 -glycol radicals G are alpha-omega hydroxy-functional glycol radicals such as ethylene glycol, propylene glycol, di-, tri- and tetraethylene glycol, di-, tri- and tetrapropylene glycol radicals, alpha-omega hydroxy-functional mixed glycol radicals from 1-5 Ethylene glycol units and 1-5 propylene glycol units and mixtures thereof.
  • the C1-C25 glycol radicals G are preferably linear or branched monomeric or oligomeric C 2 -C 5 -glycol radicals, as well as mixed glycol radicals, in particular C 2 -C 4 -glycol radicals having a total of at most 15 carbon atoms.
  • the various glycol units may be both randomly distributed and in block arrangement. Particular preference is given to ethylene glycol radicals or their oligomers but also to propylene glycol radicals or their oligomers and mixed glycol radicals with propylene glycol and ethylene glycol units.
  • the oligomers have at most 6, in particular at most 3 monomer units.
  • the glycol-functional organosilicon compound SG can be obtained, for example, by reacting 1 molar equivalent of methyltrichlorosilane or methyltrimethoxysilane with 2.5 to 6 molar equivalents of ethylene glycol, excess ethylene glycol optionally being removed by distillation optionally by vacuum after the reaction.
  • 1 molar equivalent of methyltrichlorosilane is reacted with 2.8 molar equivalents of ethylene glycol.
  • Another typical reaction would be that of 1 molar equivalent of methyltrimethoxysilane with 2.5 molar equivalents of ethylene glycol, with the resulting methanol being removed by distillation.
  • the glycol-functional organosilicon compound SG can also be prepared by reacting methoxy-functional resins or resinous oligomers bearing suitable hydrolyzable groups such as alkoxy or hydroxy groups under suitable conditions such as acidic or basic catalysis or by using other catalysts such as e.g. those which can accelerate a transesterification reaction can be produced.
  • the glycol-functional siloxane SG preferably contains at least 70 mol% units, in particular at least 90 mol% units of the general formula 1.
  • At least 40 mol%, in particular at least 60 mol% of the units of the general formulas 1 and 2 has a radical G.
  • the organic polymer (B) is preferably obtainable by polymerization or copolymerization of monomers selected from vinyl aromatic, methacrylic or acrylic acid esters of alcohols having 1 to 15 carbon atoms, silanes bearing olefinically unsaturated hydrolyzable or non-hydrolyzable groups and optionally from the hydrolyzable groups hydrolyzates obtainable by hydrolysis of the hydrolyzable groups and the siloxanes or silicone resins bearing olefinically unsaturated groups obtainable therefrom by condensation of these hydrolates, vinyl esters of unbranched or branched alkylcarboxylic acids having 1 to 15 C atoms, dienes and vinyl halides.
  • Suitable methacrylic ester or acrylic acid ester monomers are, for example, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate,
  • Particularly preferred are methyl acrylate, methyl methacrylate, n-, iso- and t-butyl acrylate, 2-ethylhexyl acrylate and norbornyl acrylate.
  • Suitable vinyl ester monomers are vinyl esters of unbranched or branched alkylcarboxylic acids having 1 to 15 carbon atoms.
  • Vinylester preferred are vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate, vinyl laurate, 1-methylvinyl acetate, vinyl pivalate and Vinylester of ⁇ -branched monocarboxylic acids having 5 to 11 carbon atoms, branched ⁇ -VeoVa9 ®, for example, (a Vinylester monocarboxylic acid having 9 carbon atoms) or VeoValO ® (Vinylester an ⁇ -branched monocarboxylic acid having 10 carbon atoms), (from Shell) brands. Particularly preferred is vinyl acetate.
  • Suitable vinylaromatics are, for example, styrene or ⁇ -methylstyrene. Preference is given to styrene.
  • Suitable olefins and dienes are ethylene, propylene, 1,3-
  • butadiene and isoprene Preferred is ethylene.
  • Vinyl halides are vinyl chloride, tetrafluoroethylene,
  • Chlorotrifluoroethylene, vinyl fluoride Chlorotrifluoroethylene, vinyl fluoride.
  • auxiliary monomers copolymerized.
  • auxiliary monomers are acrylic and methacrylic acid.
  • auxiliary monomers are ethylenically unsaturated monocarboxylic acids such as crotonic acid, and dicarboxylic acids such as fumaric acid and maleic acid; ethylenically unsaturated carboxylic acid amides and -nitriles, preferably acrylamide and acrylonitrile; Mono- and diesters of fumaric acid and maleic acid, such as diethyl and diisopropyl esters and maleic anhydride; ethylenically unsaturated sulfonic acids or salts thereof, preferably vinylsulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid.
  • monocarboxylic acids such as crotonic acid
  • dicarboxylic acids such as fumaric acid and maleic acid
  • ethylenically unsaturated carboxylic acid amides and -nitriles preferably acrylamide and acrylonitrile
  • polymerizable epoxides such as glycidyl acrylate, glycidyl methacrylate, allyl glycidyl ether, vinyl glycidyl ether, vinylcyclohexene oxide, limonene oxide, myrcene oxide, caryophyllene oxide can be used.
  • Suitable silane monomers for the preparation of silane-modified polymers (B) are, for example, ethylenically unsaturated silicon compounds of the general formula (4)
  • R 1 is aliphatic or cycloaliphatic C 1 - to C 1-6 alkyl, C ] _- to C ⁇ g-aryl radical, Cj_ to C ⁇ g-aryloxy or C] _ to C ] _8-alkoxy radical, or halogen, such as Cl or Br,
  • R 4 is an unbranched or branched, optionally substituted alkyl radical having 1 to 12 C-atoms, preferably 1 to 3 C-atoms, an optionally substituted aryl radical having 1 to 18 C-atoms, preferably 6 to 12 C-atoms, or a
  • R 4 may optionally be interrupted by an ether group
  • R 5 is H or CH 3 , e is 0, 1 or 2 and f is 1, 2 or 3.
  • Preference is given to ⁇ -acrylo- or ⁇ -methacryloxypropyltri (alkoxy) silanes, ⁇ -methacryloxymethyltri (alkoxy) silanes, ⁇ -
  • Methacryloxymethyldi (alkoxy) methylsilanes ⁇ -methacryloxymethyl-alkoxydiraethylsilanes, ⁇ -methacryloxypropyl-methyldi (alkoxy) silanes, ⁇ -methacryloxypropyl-dimethyl (alkoxy) silanes, vinylalkyldi (alkoxy) silanes, vinyldi (alkyl) alkoxysilanes and vinyltri ( alkoxy) silanes, where as alkoxy groups, for example, methoxy, ethoxy, methoxyethylene, ethoxyethylene, Methoxypropylenglykolether- or Ethoxypropylenglykolether- radicals can be used.
  • vinyltrimethoxysilane vinyltriethoxysilane, vinyltripropoxysilane, vinyltriisopropoxysilane, vinyltris (1-methoxyisopropoxy) silane, vinyltributoxysilane, vinyltriacetoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, methacryloxymethyltrimethoxysilane, 3-methacryloxypropyltris (2-methoxyethoxy ) silane, vinyltrichlorosilane, vinylmethyl-dichlorosilane, vinyltris (2-methoxyethoxy) silane, trisacetoxyvinylsilane.
  • the organic polymer (B) may also be a polyvinyl acetal obtainable by saponification of a vinyl ester polymer obtainable by polymerization or copolymerization of one or more monomers selected from the group consisting of vinyl esters of straight or branched alkylcarboxylic acids having 1 to 15 carbon atoms and optionally one or more Monomers from the group comprising ethylenically unsaturated mono- and dicarboxylic acids, ethylenically unsaturated carboxylic acid amides and Cabonklazanitrile, monoesters of fumaric acid and maleic acid, ethylenically unsaturated sulfonic acids and their salts, ethylenically unsaturated hydrolyzable or non-hydrolyzable groups silanes and optionally from the hydrolyzable groups by hydrolysis the hydrolyzable groups available hydrolysates and the by siloxanes or silicone resins carrying ethylenically unsaturated groups which are obtained by partial condensation
  • Surfactants (C) are required to disperse the organic polymers (B).
  • Suitable anionic surfactants (C) are in particular:
  • Alkyl sulfates especially those having a chain length of 8 to 18 carbon atoms, alkyl and alkaryl ether sulfates having 8 to 18 carbon atoms in the hydrophobic radical and 1 to 40 ethylene oxide (EO) - or propylene oxide (PO) units.
  • EO ethylene oxide
  • PO propylene oxide
  • sulfonates especially alkyl sulfonates having 8 to 18 carbon atoms, alkylaryl sulfonates having 8 to 18 carbon atoms, taurides, esters and half esters of succinic acid with monohydric alcohols or alkylphenols having 4 to 15 carbon atoms, - optionally, these alcohols or alkylphenols also be ethoxylated with 1 to 40 EO units.
  • Phosphoric acid partial esters and their alkali metal and ammonium salts especially alkyl and alkaryl phosphates having 8 to 20 C atoms in the organic radical, alkyl ether or alkaryl ether phosphates having 8 to 20 C atoms in the alkyl or alkaryl radical and 1 to 40 EO- Units.
  • Particularly suitable nonionic surfactants (C) are:
  • polyvinyl alcohol which still has 5 to 50%, preferably 8 to 20% Vinylacetatein felt, with a degree of polymerization of 500 to 3000.
  • Alkylpolyglycolether preferably those having 8 to 40 EO units and alkyl radicals of 8 to 20 carbon atoms.
  • Alkylarylpolyglycolether preferably those having 8 to 40 EO units and 8 to 20 carbon atoms in the alkyl and aryl radicals.
  • Ethylene oxide / propylene oxide (EO / PO) block copolymers preferably those having 8 to 40 EO or PO units.
  • Natural products and their derivatives such as lecithin, lanolin, saponins, cellulose; Cellulosealkyl ethers and carboxyalkylcelluloses whose alkyl groups each have up to 4 carbon atoms.
  • Polar group-containing linear organo (poly) siloxanes in particular those with alkoxy groups having up to 24 carbon atoms and / or up to 40 EO and / or PO groups.
  • cationic surfactants (C) are particularly suitable:
  • Quaternary alkyl and alkylbenzene ammonium salts especially those whose alkyl group has 6 to 24 carbon atoms, in particular the halides, sulfates, phosphates and acetates.
  • Alkyloxazoliniumsalze especially those whose alkyl chain has up to 18 carbon atoms, especially the halides, sulfates, phosphates and acetates.
  • ampholytic surfactants (C) are:
  • Long-chain substituted amino acids such as N-alkyl-di- (aminoethyl) glycine or N-alkyl-2-aminopropionsäuresalze.
  • Betaines such as N- (3-acylamidopropyl) -N: N-dimethylammonium salts with a C 8 -C 18 acyl radical and alkyl imidazolium betaines.
  • the preparation contains pigments (D).
  • pigments (D) are earth pigments, such as chalk, ocher, umber, green earth, mineral pigments, such as titanium dioxide, chrome yellow, red lead, zinc yellow, Zinc green, cadmium red, cobalt blue, organic pigments such as sepia, Kasseler brown, indigo, azo pigments, antraquinoid, indigoidene, dioxazine, quinacridone, phthalocyanine, isoindolinone and alkali blue pigments.
  • earth pigments such as chalk, ocher, umber, green earth
  • mineral pigments such as titanium dioxide, chrome yellow, red lead, zinc yellow, Zinc green, cadmium red, cobalt blue
  • organic pigments such as sepia, Kasseler brown, indigo, azo pigments, antraquinoid, indigoidene, dioxazine, quinacridone, phthalocyanine, isoindolinone and alkali
  • the aqueous building coating agents may still contain additives (F).
  • Additives (F) include, for example, biocides, thickeners, alkyl orthotitanates, alkyl boric acid esters, pigment wetting and dispersing agents, antifoaming agents, anticorrosion pigments, other metal oxides which are not identical to the pigment (D) and are not anti-corrosive pigments, metal carbonates and organic resins which are not identical are with the organic polymer (B).
  • glycol-functional organosilicon compounds SG may be added to the building material coating compositions either as a pure substance or they may be used in preparations together with other components, e.g. as an aqueous solution. They can be added during the process of producing the building material coating in the course of different process steps. For example, they may be added to the millbase, as is typical of silicone resin binders, or they may be added during the paint process, as is typical of silicone surfactant additives.
  • the aqueous building material coating compositions preferably comprise from 0.1 to 20% by weight, particularly preferably from 0.5 to 15% by weight, in particular from 0.5 to 10% by weight, of glycol-functional organosilicon compound SG.
  • the aqueous building material coating compositions preferably contain 0.5 to 30 wt .-%, particularly preferably 1 to 20 wt .-%, in particular 5 to 15 wt .-% organic polymer (B).
  • the aqueous building material coating compositions preferably contain from 0.1 to 10% by weight, more preferably from 0.5 to 5% by weight, of surfactant (C).
  • the aqueous building material coating compositions preferably contain 0.5 to 40% by weight, more preferably 2 to 25% by weight, in particular 5 to 15% by weight of pigment (D).
  • the aqueous building material coating compositions preferably contain 10 to 70 wt .-%, particularly preferably 15 to 50 wt .-%, in particular 20 to 40 wt .-% water (E).
  • the aqueous building material coating compositions preferably contain from 0.1 to 60% by weight, more preferably from 1 to 50% by weight, in particular from 10 to 40% by weight, of additives (F).
  • building materials coating means are understood colors that are intended both for use directly on the building both inside and outside, as well as those that are applied to the facilities to buildings such as outdoor facilities possibly in a broader sense, ie in the example of outdoor facilities on verandas, terraces, outdoor railings, etc. and on land boundaries or fencing, eg on pasture fences, etc. are applied.
  • the coating of unobstructed building materials, such as bricks sand-lime bricks or concrete blocks is included.
  • Such coatings can be porous or film-forming.
  • the most common substrates are mineral in nature. Besides For example wood and metal and plastics can be used as a substrate.
  • the invention also provides a process for the treatment of building materials with a building material coating composition containing the glycol-functional organosilicon compounds SG, and the use of the glycol-functional organosilicon compounds SG as a constituent in building material coating compositions.
  • Amine number of about O 7 3 a viscosity of about 1500 mm ⁇ / s at
  • a sand-lime brick was coated with a brush with 200 g / m 2 of this silicone resin paint.
  • test specimen was dried after coating for 1 week at room temperature and then stored for 24 h in standard atmosphere (23 0 C + _ 2 ° C, 50% + 5% relative humidity).
  • standard atmosphere 23 0 C + _ 2 ° C, 50% + 5% relative humidity.
  • conditioning was carried out in such a way that the test specimen was not stored 3 times per 24 h in fresh tap water and then dried in each case, but instead the test specimen was subjected to water storage for 72 h and then to the test
  • Another sand-lime brick was coated with a brush with 200 g / m 2 of the silicone resin paint according to Example 1. After drying for 2 h at room temperature, the sand-lime brick was inclined at 45 ° to the horizontal and water was dropped from a pipette perpendicular to the surface. The drops of water spontaneously bead off.
  • a sand-lime brick was made with a brush with 200 g / m 2 of this. Silicone resin paint coated.
  • test specimen was dried after coating for 1 week at room temperature and then stored for 24 h in a standard atmosphere (23 0 C + _ 2 0 C, 50% ⁇ 5% relative humidity).
  • Another sand-lime brick was coated with a brush with 200 g / m ⁇ of the silicone resin paint of Example 2. After drying for 2 h at room temperature, the sand-lime brick was inclined at 45 ° to the horizontal and water was dropped from a pipette perpendicular to the surface. The drops of water run off the surface, forming a visibly smaller contact angle with the surface than in Example 1.
  • Example 3 Silicone resin paint according to the invention, which is prepared with a glycol-functional water-soluble siloxane / SHfitend.seh. SG as early hydrophobing additive.
  • the invention glycol functional water-soluble silane / •
  • Siloxane mixture SG is obtained as follows:
  • Methyltrichlorosilane is mixed with toluene in the ratio 1: 1 and added to a template from the 2.8-fold molar excess
  • Ethylene glycol added by means of dropping funnel. A gentle water-jet vacuum is constantly applied to the apparatus (about 200 mbar).
  • the mixture of methyltrichlorosilane and toluene is from the
  • the system After complete metered addition of the methyltrichlorosilane / toluene mixture, the system is refluxed for 2 hours. After refluxing, the batch is cooled to room temperature. Two phases are formed, one phase being toluene and the second phase being the product phase containing the polyether-modified polysiloxane.
  • the HCl content of the crude product is ⁇ 50 ppm.
  • the phases are separated and from the product phase, the toluene is removed by rotary evaporation under vacuum (about 10 mbar, 110 0 C distilled off.
  • composition and preparation of the building protection coating according to the invention of the type silicone resin emulsion paint Mixing takes place in a commercially available, high-speed stirrer for the production of aqueous building protection coatings in this order:
  • a lime sandstone is coated with a brush with 200 g / m ⁇ of this silicone resin paint.
  • test specimen was dried after coating for 1 week at room temperature and then stored for 24 h in a standard atmosphere (23 0 C 4- 2 0 C, 50% + _ 5% relative humidity).
  • the conditioning was carried out deviating from the standard DIN EN 1062-3 so that the test specimen was not stored 3 times per 24 h in fresh tap water and then each dried, but the specimen was 72 h continuously subjected to water storage and then the
  • Another sand-lime brick was coated with a brush with 200 g / m 2 of silicone resin paint. After drying at room temperature for 2 h, the sand-lime brick was inclined at 45 ° to the horizontal and water was dropped from a pipette perpendicular to the surface. The drops of water spontaneously bead off. The effect is as pronounced as in Example 1.
  • Example 4 Silicone resin dye of the invention, which is prepared with a glycol-functional water-soluble siloxane / Si GmbHd.seh SG as a binder.
  • glycol-functional water-soluble silane / siloxane mixture according to the invention is obtained as described in Example 3.
  • composition and preparation of the building protection coating according to the invention of the type silicone resin emulsion paint Mixing takes place in a commercially available, high-speed stirrer for the production of aqueous building protection coatings in this order:
  • silane / siloxane mixture SG 50 parts by weight of silane / siloxane mixture SG as described above.
  • a sand-lime brick is coated with a 200 g / rn-2 brush of this silicone resin paint.
  • test specimen was dried after coating for 1 week at room temperature and then stored for 24 h in a standard atmosphere (23 0 C + _ 2 0 C, 50% + ⁇ 5% relative humidity).
  • the conditioning was carried out deviating from the standard DIN EN 1062-3 so that the test specimen was not stored 3 times per 24 h in fresh tap water and then each dried, but the specimen was 72 h continuously subjected to water storage and then the

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Abstract

La présente invention concerne des agents de revêtement de matériaux de construction aqueux qui contiennent: (A) un composé de silicium organique glycofonctionnel (SG) qui, à 20 °C, a une solubilité d'au moins 10 g dans 100 g d'eau; (B) un polymère organique qui peut être obtenu par polymérisation de monomères oléfiniquement insaturés; (C) un tensioactif; (D) un pigment; et (E) de l'eau.
PCT/EP2006/002177 2005-04-26 2006-03-09 Agents de revetement de materiaux de construction aqueux, contenant des composes de silicium organique glycofonctionnels WO2006114154A1 (fr)

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DE200510019254 DE102005019254A1 (de) 2005-04-26 2005-04-26 Glykolfunktionelle Organosiliciumverbindungen enthaltende wässrige Baustoffbeschichtungsmittel
DE102005019254.8 2005-04-26

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EP4263462A1 (fr) 2020-12-18 2023-10-25 Evonik Operations GmbH Compositions aqueuses stables à la dilution pour l'hydrophobisation en masse de matériaux de construction minéraux

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