WO2008113764A1 - Peintures aqueuses - Google Patents

Peintures aqueuses Download PDF

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Publication number
WO2008113764A1
WO2008113764A1 PCT/EP2008/053112 EP2008053112W WO2008113764A1 WO 2008113764 A1 WO2008113764 A1 WO 2008113764A1 EP 2008053112 W EP2008053112 W EP 2008053112W WO 2008113764 A1 WO2008113764 A1 WO 2008113764A1
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WIPO (PCT)
Prior art keywords
radicals
radical
silicone resin
alkyl
paints
Prior art date
Application number
PCT/EP2008/053112
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German (de)
English (en)
Inventor
Frank Sandmeyer
Original Assignee
Wacker Chemie Ag
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Publication date
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Publication of WO2008113764A1 publication Critical patent/WO2008113764A1/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
    • 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
    • C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
    • C04B41/61—Coating or impregnation
    • C04B41/62—Coating or impregnation with organic materials
    • C04B41/64—Compounds having one or more carbon-to-metal of carbon-to-silicon linkages
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L97/00—Compositions of lignin-containing materials
    • C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/15—Impregnating involving polymerisation including use of polymer-containing impregnating agents
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
    • C08G77/16—Polysiloxanes containing silicon bound to oxygen-containing groups to hydroxyl groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
    • C08G77/18—Polysiloxanes containing silicon bound to oxygen-containing groups to alkoxy or aryloxy groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes

Definitions

  • the invention relates to aqueous paints for mineral building materials or wood containing curable, self-priming, aqueous silicone resin dispersions.
  • Wood and mineral building materials are usually best protected against the weather by a water-repellent impregnation and a coating applied thereto.
  • a water-repellent impregnation made of a water-repellent
  • Impregnation becomes a water-repellent primer once the former is coated.
  • the primer is applied directly to the wood or the mineral substrate. It makes the substrate water-repellent to a certain depth by forming a hydrophobic zone and provides a permanently improved connection between the uniformly hydrophobized substrate and the building material coating.
  • Organosilanes, oligomeric organosiloxanes or silicone resins are the best active ingredients for water-repellent primers.
  • Solvent-based and aqueous primers are used.
  • Solvent-based primers usually contain in addition to organosilanes, oligomeric organosiloxanes or
  • Silicone resins Synthetic resins, such as styrene acrylates and pure acrylates, which serve to solidify the substrate.
  • Contain solvents Contain solvents. They can be used wherever the ground is still reasonably intact.
  • the highly alkaline aqueous potassium siliconate solutions, microemulsions or emulsions of organosilanes, oligomeric organosiloxanes or silicone resins are then used.
  • the hydrophobic primer leads to a leveling absorbency of the substrate and thus to an improved adhesion of the building material coating, and to a going into the depth of the substrate water repellent effect.
  • EP 0 234 024 A1 describes the water-repellent impregnation of building materials with an emulsion of alkylalkoxysilanes.
  • US 4,757,106 describes the hydrophobing of building materials with microemulsions of alkoxy-containing organopolysiloxanes and salts of Aminosiliconölen.
  • EP 0 606 671 A1 describes organopolysiloxane resin, filler and alkoxysilane-containing emulsions which are applied to mineral building materials.
  • the fillers have a specific surface area of at least 40 m 2 / g and are added in small amounts.
  • EP 0 761 675 A2 describes cohydrolysis products of various silanes and their use as impregnating agent and primer.
  • EP 0 776 873 A2 are emulsions of silanes and their
  • the covering building material coatings in one or more layers applied.
  • building material coatings are paints and plasters. Particularly important is the pre-treatment of the substrate with water-repellent primer as soon as the building material coating contains emulsifiers or other wetting agents.
  • EP 0 791 566 B1 teaches self-impregnating optionally organopolysiloxane-containing paints for mineral building materials with 1-30% alkylalkoxysilane.
  • the alkylalkoxysilane acts as an impregnating agent and, when added to the paint, leads to a basic impregnation of the substrate, without the need for a separate impregnation step.
  • the addition of the impregnating agent takes place here as a separate step during the formulation of the paint.
  • These are very effective impregnating agents for mineral building materials. They are not volatile and therefore remain on the building material even in warm weather. They are insoluble in water, which is why they can not simply be washed out by rainwater.
  • the object of the present invention was to provide self-impregnating paints which do not exhibit the abovementioned disadvantages, with better or equally good performance properties.
  • This application is an aqueous paint for mineral building materials or wood, which is characterized in that it contains a curable silicone resin dispersion containing 0.5 to 6 wt .-% of a Ci-C 2 o-alkyl-C2-C3 as an integral part Alkoxysilane impregnating agent (F) based on the silicone resin dispersion.
  • (F) is contained as an integral part of 2 to 6 wt% in the curable silicone resin dispersion.
  • the inventive aqueous paint composition contains from 0.05 to 0.95 wt .-% Ci-C2o-alkyl-C 2 -C 3 alkoxysilane-impregnating agent (F), based on the aqueous paint, and is characterized in that ( F) is introduced as an integral part of a curable silicone resin dispersion in the paint.
  • curable silicone resin dispersions used as an ingredient in the aqueous paints of the invention contain
  • (E) 0.01 to 10 wt .-% auxiliaries, and are characterized in that they (F) from 0.5 to 6 wt .-% of a Ci-C2o-alkyl-C 2 -C 3 alkoxysilane as containing a basic impregnating agent as an integral part.
  • (F) is contained as an integral part of 2 to 6 wt% in the curable silicone resin dispersion.
  • the silicone resin dispersion has a viscosity between 10 and 50,000 mPa * s, in particular 20-10,000 mPa * s at 23 ° C.
  • the preparation of the curable silicone resin dispersion is carried out according to the known processes of the prior art, and is characterized in that it contains as an integral part from 0.5 to 6 wt .-% of Ci-C2o ⁇ alkyl-C2-C3-alkoxysilane impregnating agent ( F) are mixed.
  • the preparation of the aqueous coating material according to the invention is carried out according to the prior art and is characterized in that the curable silicone resin dispersion is admixed, which contains 0.5 to 6% by weight of a Ci-C2o-alkyl-C2-C3-alkoxysilane as an integral part Impregnating agent (F), based on the curable silicone resin dispersion contains.
  • the curable silicone resin dispersion is admixed, which contains 0.5 to 6% by weight of a Ci-C2o-alkyl-C2-C3-alkoxysilane as an integral part Impregnating agent (F), based on the curable silicone resin dispersion contains.
  • the aqueous coating material is applied to mineral building materials or wood.
  • a coating system consisting of water-repellent primer and topcoat is applied in two or three operations:
  • the most important paints according to the invention are paints and plasters and are applied to mineral building materials or wood and lead to a coating and water-repellent impregnation.
  • the aqueous paint is preferably a paint.
  • the paints suitable for the purposes of the invention are either supplied dry, but applied in the form of a water-containing preparation, such as powder paints and powdered dry plasters or are wet, such as pasty, water-based paints, for example silicone resin paints, silicate paints and emulsion paints, or pasty water-based plasters, for example Synthetic resin plasters and silicone resin plasters.
  • the impregnating paints suitable for the purposes of the invention can be classified according to application strength and are applied thickly, such as plasters in the millimeter to centimeter range, or are applied thinly, such as opaque paints in the 100 ⁇ m to 1 millimeter range.
  • impregnating paints suitable for the purposes of the invention can be used both on buildings inside and outside, preferably outside.
  • Examples are silicate plasters, dry plasters, coating fillers, reinforcing materials,
  • Fillers resin plasters, mineral plasters, silicone resin plasters and resin-bonded coatings.
  • Preferred examples are interior paints, facade paints, mineral paints, emulsion paints, silicone resin paints, silicone facade paints, dispersion silicate paints, silicate paints, lime paints and dispersion lime paints.
  • the silicone resin (A) is preferably an organopolysiloxane of units of the general formula (1)
  • R is the same or different monovalent, optionally halogen-substituted, SiC-bonded C1-C20 hydrocarbon radicals
  • C 1 -C 20 -hydrocarbon radicals R are the C 1 -C 20 -alkyl radicals listed for the alkylalkoxysilanes (F) and halogen-substituted C 1 -C 20 -alkyl radicals which contain alkenyl radicals, such as the vinyl, allyl, n-5-hexenyl, 4-vinylcyclohexyl and 3-norbornenyl; Aryl radicals such as the phenyl, biphenylyl, naphthyl and anthryl and phenanthryl radicals; 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 beta-phenylethyl radical. Particularly preferred are the non-substituted Ci-Ci2-alkyl radicals and the
  • R groups may be replaced by hydrogen atoms bonded directly to silicon atoms. However, this is not preferred.
  • radicals R 1 are the methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, and tert. Butyl radical; Pentyl radicals, such as the n-pentyl radical and hexyl radicals, such as the n-hexyl radical, wherein the ethyl radicals are particularly preferred.
  • (A) from 10 to 60 wt .-%, particularly preferably from 25 to 55 wt .-%, in the silicone resin dispersion.
  • the organopolysiloxane (B) contains, in addition to other organosiloxane units, such siloxane units having SiC-bonded radicals with basic nitrogen, provided that the amine number of the organopolysiloxane is at least 0. 01.
  • the organopolysiloxanes (B) are preferably those of units of the general formula (2)
  • R 2 is the same or different monovalent, of basic
  • Ci-Ce-Al kyl re s te a 0, 1, 2 or 3, b 0, 1, 2 or 3, an average of at least 0.05 and c 0, 1, 2 or 3, with the proviso that the sum of a, b and c is less than or equal to 3 and that the amine number of the organopolysiloxane (B) is at least 0.01.
  • the amine number refers to the number of ml of 1-n-HCl required to neutralize 1 g of organopolysiloxane (B).
  • the amine value of the organopolysiloxane (B) is preferably at least 0.1, in particular at least 0.2, and preferably at most 8, in particular at most 4.
  • radical R 2 examples and preferred examples of the radical R 2 are listed above for the radical R.
  • the methyl and isooctyl radicals are preferred for the radical R 2 .
  • a hydrocarbon radical in particular a methyl radical, bound.
  • R 3 is preferably a radical of the general formula (3)
  • R 5 can be identical or different and is hydrogen or a monovalent, substituted or unsubstituted C 1 -C 10 -hydrocarbon radical or C 1 -C 10 -ione
  • R 6 is a divalent Ci-Ci 5 hydrocarbon radical.
  • radical R 5 are the examples of hydrocarbon radicals given for radical R and also hydrocarbon radicals substituted by amino groups, such as aminoalkyl radicals, the aminoethyl radical being particularly preferred.
  • At least one hydrogen atom is bonded to each nitrogen atom in the radicals of general formula (3).
  • Radical R is preferably divalent hydrocarbon radicals having 1 to 10 carbon atoms, particularly preferably 1 to 4 carbon atoms, in particular the n-propylene radical.
  • radical R examples are the methylene, ethylene, propylene, butylene, cyclohexylene, octadecylene, phenylene and butenylene radical.
  • radicals R 3 are branched radicals
  • alkyl radicals R 1 also apply in their entirety to the radical R 6 .
  • radical R 4 examples and preferred examples of the radical R 4 are listed above for the radical R 1 .
  • the methyl and ethyl radicals are preferred.
  • the preferred average value for a is 0 to 2, especially 0 to 1.8.
  • the preferred average value for b is 0.1 to 0.6, especially 0.15 to 0.30.
  • the preferred average value of c is 0 to 0.8, especially 0.01 to 0.6.
  • the organopolysiloxanes (B) have a viscosity of from 5 to 5000, in particular from 100 to 3000 mm 2 / s at 25 ° C.
  • Organopolysiloxanes (B) can be prepared in a known manner, for example by equilibrating or condensing amino-functional silanes with organopolysiloxanes which contain alkoxy groups and / or hydroxyl groups and which are free from basic nitrogen.
  • (B) is from 0.05 to 2% by weight, more preferably from 0.1 to 1.5% by weight, contained in the silicone resin dispersion.
  • the aqueous dispersion of the silicone resin formulation contains dispersing aids (C) as described, for example, in 2006 McCutcheon's Emulsifiers & Detergents, North American Edition, MC Publishing Co., Glen Rock, N.J. are named. Particularly suitable are
  • 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 may also be ethoxylated with 1 to 40 EO units.
  • partial phosphoric acid esters and their alkali metal and ammonium salts especially alkyl and alkaryl phosphates with 8 to 20 carbon atoms in the organic radical, alkyl ether or alkaryl ether phosphates having 8 to 20 carbon atoms in the alkyl or alkaryl radical and 1 to 40 EO units.
  • polyvinyl alcohol which still has 5 to 50%, preferably 8 to 20%, Vinylacetateinomme having 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
  • 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, their alkyl groups each up to Have 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.
  • 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.
  • Alkylpyridinium, alkylimidazolinium and Alkyloxazoliniumsalze especially those whose alkyl chain has up to 18 carbon atoms, especially the halides, sulfates, phosphates and acetates.
  • 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 C8-C18 acyl radical and alkyl imidazolium betaines.
  • Preferred dispersants are nonionic emulsifiers (C2), in particular the addition products of alkylamines with ethylene oxide or propylene oxide listed above under 9, the alkylpolyglycosides listed under 11. above and those listed under 5.
  • C2 nonionic emulsifiers
  • Particularly preferred polyvinyl alcohols still contain from 5 to 20%, in particular from 10 to 15%, of vinyl acetate units and preferably have a degree of polymerization of from 500 to 3,000, in particular from 1,200 to 2,000.
  • the proportion of the dispersing assistant (C) is preferably 1 to 30 wt .-%, in particular 2 to 10 wt .-%, based on the total amount of silicone resin dispersion.
  • aqueous silicone resin dispersions according to the invention comprise water (D), preferably from 10 to 70% by weight, in particular from 15 to 60% by weight, based on the total amount of silicone resin dispersion.
  • auxiliaries (E) it is possible to use all auxiliaries hitherto used in the prior art, for example emulsifiers for the homogeneous, stable dispersion of the silicone resin preparation in water.
  • Other auxiliaries are, for example, other non-inventive silicone resins or polyorganosiloxanes, silanes, organic solvents, wetting and dispersing agents, film-forming agents, anti-foaming agents, adhesion promoters, flow control agents, crosslinking catalysts, pH adjusters, preservatives, solubilizers.
  • the proportion of the excipients (E) is preferably 0.1 to 10 wt .-%, in particular 0.1 to 8 wt .-%, based on the total amount of the silicone resin dispersion.
  • the C 1 -C 20 -alkyl-C 1 -C 6 -alkoxysilanes (F) preferably have 1 or 2 identical or different, optionally halogen-substituted, monohydric C 1 -C 20 -alkyl radicals bonded via SiC and the other radicals are identical or different C 1 -C 6 -alkoxy radicals , in particular C2- or C3-alkoxy radicals.
  • Particularly preferred are the alkyltrialkoxysilanes, such as Octyltriethoxysilane and butyltriethoxysilane.
  • C 2 -C 3 -alkoxy radicals are the ethoxy, n-propoxy, isopropoxy radical.
  • the ethoxy radicals are particularly preferred.
  • Methoxysilanes hydrolyze too quickly for many applications and have a shorter shelf life than longer alkoxy radicals.
  • C 4 -C 6 -alkoxy radicals are too inert for many applications.
  • Ci-C2o ⁇ alkyl radicals are 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-trimethylpentyl radical; Nonyl radicals, such as the n-nonyl radical; Decyl radicals, such as the n-decyl radical and dodecyl radicals, such as the n-dodecyl radical; Cycloalkyl, such as cyclopentyl, cyclohexyl, 4-ethylcyclohexyl, cycloheptyl, norbornyl and methylcyclohexyl.
  • halogen-substituted C 1 -C 20 -alkyl radicals are alkyl radicals which are substituted by fluorine, chlorine, bromine and iodine atoms, such as the 3, 3, 3-trifluoro-n-propyl radical, 2, 2, 2, 2 ', 2' 2 '- Hexafluorisopropylrest and Heptafluorisopropylrest.
  • Impregnating acts is preferably contained only in amounts of 0.05 to 0.95% based on the total aqueous preparation of the paint.
  • Preferably (F) contains between 0.1 to 0.8% by weight, more preferably 0.1 to 0.5% by weight, in the aqueous paint.
  • Example 1 Building Protection Coating According to the Invention with Supercritical Pigment Volume Concentration (PVK)
  • the formulation gives a porous coating because its pigment volume concentration (PVK) is above the critical PVK.
  • the coating preparation contains 0.5% by weight, based on the total preparation of self-impregnating isooctyltriethoxysilane.
  • Example 2 Comparative Examples for Construction Coatings According to EP 0 791 566 Bl.
  • Example 2a In the otherwise unchanged formulation according to Example 1, 10.19 g of isooctyltriethoxysilane were used in Example 2a
  • Example 2b 20.38 g of isooctyltriethoxysilane
  • Example 2c 30.57 g of isooctyltriethoxysilane are added.
  • the preparations according to Example 2a contain 1.5% by weight of impregnating agent isooctyltriethoxysilane, according to Example 2b
  • aqueous solutions according to Examples 1, 2a, 2b and 2c were each spread on a commercial fiber cement board with a brush in an application amount of 200 g / m 2 .
  • 1 g of activated carbon is distributed evenly and loosely on the coated fiber cement boards when stored evenly.
  • the plates are then tilted at a 45 ° inclination with the coated side facing up. This trickles off excess activated carbon powder. This process is repeated with another gram of activated carbon powder.
  • Then rinse the surface evenly with 1 liter of water.
  • the substrate then dries for 16 h.
  • the hue deviation ⁇ L (gray tone deviation) before and after Pollution by activated carbon and cleaning is determined. The following results were obtained:
  • Example 1 26.09
  • Example 2a 29.82
  • Tables 1 to 5 show that the performance properties of the coating according to the invention are as good as those of the prior art. However, the coatings of the invention show a lower tendency to fouling and are also easier in the formulation.
  • silicone resin solution containing a silicone resin 1 composed of 90 mol% Si0 3/2 units R 7 ( T units) and 10 mol% of (CH 3) 2 SiO 2/2 units , wherein up to 100% T units, 8 mol% C 2 H 5 OSi ⁇ 3 / 2 units and 2 mol% (HO) Si ⁇ 3 / 2 units and the remaining 90 mol%
  • a silicone resin 2 consisting of 100% T units as indicated for the resin dissolved in toluene is added, in which case 80 mole% of the T units of the CH3Si ⁇ 3 / 2 and 20 mol% of the type C2H 5 OSi ⁇ 3 / 2 are. Calculated on 100% silicone resin 1 2 20 percent by weight of silicone resin are added. To this mixture are calculated on the mass of silicone resin 1 10% by weight of triethoxyisooctlysilane, which performs the function of the impregnating agent Has. The toluene is removed by thin-film evaporation. An emulsion according to the prior art is produced from the residue, for example by the method according to EP 1 583 790 B1 or according to EP 0 824 510 Bl.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Paints Or Removers (AREA)

Abstract

L'invention concerne des peintures aqueuses pour matériaux minéraux ou pour bois. Ces peintures contiennent une dispersion de résine de silicone durcissable qui contient de 0,5 à 6 % en poids d'un agent d'imprégnation C1-C20-alkyl-C2-C3-alcoxysilane (F), en tant que composant intégral, par rapport à la dispersion de résine de silicone.
PCT/EP2008/053112 2007-03-19 2008-03-14 Peintures aqueuses WO2008113764A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007013077.7 2007-03-19
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EP0791566A1 (fr) * 1996-02-15 1997-08-27 Wacker-Chemie GmbH Revêtement auto-apprêtant pour matériaux de construction
US6403163B1 (en) * 2000-06-27 2002-06-11 Chemrex, Inc. Method of treating surfaces with organosilicon water repellent compositions

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