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WO1995022580A1 - Compositions aqueuses pour le traitement hydrofuge d'ouvrages de maçonnerie - Google Patents

Compositions aqueuses pour le traitement hydrofuge d'ouvrages de maçonnerie Download PDF

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Publication number
WO1995022580A1
WO1995022580A1 PCT/AU1995/000085 AU9500085W WO9522580A1 WO 1995022580 A1 WO1995022580 A1 WO 1995022580A1 AU 9500085 W AU9500085 W AU 9500085W WO 9522580 A1 WO9522580 A1 WO 9522580A1
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Prior art keywords
siloxane
emulsion
carbon atoms
weight
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/AU1995/000085
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English (en)
Inventor
Ren Kebao
Douglas Kagi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Victoria University of Australia
University of Victoria
Original Assignee
Victoria University of Australia
University of Victoria
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Publication date
Application filed by Victoria University of Australia, University of Victoria filed Critical Victoria University of Australia
Priority to AU18018/95A priority Critical patent/AU689224B2/en
Publication of WO1995022580A1 publication Critical patent/WO1995022580A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • C04B41/009—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
    • C04B41/45—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
    • C04B41/60—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
    • 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
    • C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
    • C04B41/81—Coating or impregnation
    • C04B41/82—Coating or impregnation with organic materials
    • C04B41/84—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
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2383/00—Characterised by the use 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; Derivatives of such polymers
    • C08J2383/04—Polysiloxanes

Definitions

  • the present invention relates to the treatment of materials to impart water repellency thereto. More particularly this invention relates to water repellent compositions containing aqueous emulsions of siloxanes and siloxanes/silanes for use on materials used in building.
  • Hydrophobic additives may be added to the building materials before they are formed, or the second alternative is to impregnate or coat the building materials after they are formed.
  • the present invention relates to a method of treating the building material after it has been formed to make it water repellent.
  • Organosilicone products dissolved in organic solvents have been used for rendering masonry and other substrates water repellent for many years.
  • the products in use are silanes, siloxanes or mixtures of silanes and siloxanes. These have been used in varying concentrations with or without catalysts.
  • pure silanes without the use of solvent carrier have been used as disclosed in U.S. Patent No. 4,716,051 to Rodder.
  • these products have been technically successful in terms of good penetration depth, low water absorption of the treated substrate and alkali stability of the final polymer.
  • Alkylalkoxysilanes have been used widely to impregnate permeable mineral building materials to render them water repellent.
  • the action of alkylalkoxysilanes in rendering a surface hydrophobic is known to be based on the fact that when an alkylalkoxysilane is applied onto the surface, the atmospheric moisture, and in some cases the water that is on the surface, causes the silane to be hydrolysed and alkyl silanols are formed as intermediates.
  • the hydroxyl groups of the silanol react with the hydroxyl groups of the material, and with other hydroxyl groups of silanols forming siloxanes.
  • a bond between alkyl siloxanes and the mineral boundary surface is produced in which the alkyl group of the siloxane is exposed on the surface.
  • This boundary surface bond greatly increases the surface tension of the mineral materials with respect to water, and the surface becomes water repellent.
  • the degree of the water repellency on the surface of the substrate depends on the nature of the alkyl group of the alkylalkoxysilane.
  • the bond between the alkyl group and the silicon atom of the silane can be destroyed by light and ultraviolet rays. For long term hydrophobicity, the silane should penetrate deeply into the surface to be protected from the destructive action of light and ultraviolet rays.
  • Aqueous silicone compositions have been developed in an attempt to overcome the problems of organic solvents and the alkalinity of organosiliconates.
  • U.S. Patent No. 2,881 ,146 to Remer et al. discloses an organopolysiloxane emulsion for the treatment of fabrics.
  • Hyde et al. in U.S. Patent No. 2,891 ,920 describe emulsions of organopolysiloxanes as protective coatings for surfaces as distinct from impregnating materials.
  • U.S. Patent No. 3,076,773 to Foster et al. describes aqueous emulsions of solvent/siloxane mixtures for the surface coating of metal plates and boxes.
  • U.S. Patent No. 3,294,725 to Findlay et al. discloses a method of preparing stable organopolysiloxane latex emulsions by polymerising siloxanes and silcarbanes, using a surface active sulfonic ' acid catalyst.
  • the emulsions produced by this method are very stable and have very fine particle sizes.
  • U.S. Patent 4,175,159 to Raleigh discloses a silicone emulsion for treating silicate particulate matter such as perlite and vermiculite.
  • This emulsion of a silicone polymer is produced with an emulsifier of the ammonium salt of a long chain aliphatic carboxylic acid.
  • the silicate particles are heated and the silicone fluid forms a coating on the silicate surface and the ammonia evaporates to leave the oily aliphatic carboxylic acid on the surface.
  • Koerner et al. in U.S. Patent No. 4,476,282 disclose a method of producing finely divided oil-in-water emulsions of organopolysiloxanes.
  • U.S. Patent No. 4,552,910 to Deubzer et al. discloses aqueous organopolysiloxane emulsions for use as additives in aqueous paint compositions.
  • Grape et al. in U.S. Patent No. 4,582,874 disclose a method of preparation of aqueous emulsions of low molecular weight silicone resins with non-ionic emulsifiers or two non-ionic emulsifiers.
  • Liles et al. in U.S. Patent No. 5,074,912 disclose a siloxane emulsion as a masonry water repellent where the siloxane molecule of the silylidyne radical is present.
  • An emulsion of a polysiloxanediol, an aminosilane, a higher alkylsilane and a mixture of non-ionic surfactants is disclosed in E.P. 0 476 452 A2 to Seyffert ' et al.
  • U.S. Patent No. 5,091 ,002 to Schamberg et al. discloses a composition which comprises an emulsion of an alkoxysilane, an emulsion of a polysiloxane, a non-ionic or anionic surfactant and a filler.
  • Gerhardinger et al. discloses an emulsion of a silane and siloxane to impregnate paper-containing building material.
  • the use of surfactants may result in a poor beading effect, possibly due to the adsorbed surfactant at the surface undergoing rewetting on exposure to water.
  • an emulsifier is usually necessary.
  • the emulsifier has an effect on the masonry surface which deteriorates the water repellent effect of the treated surface. This effect causes a wetting of the very surface of the substrate and therefore would not be acceptable in freezing climatic conditions.
  • pollutive substances could be carried into the substrate in this wetted layer.
  • the present invention provides long shelf stable siloxane emulsions and siloxane/silane emulsions with surfactants as the emulsifiers.
  • long-shelf stable means that the emulsions are capable of being stored for at least three months under normal storage conditions without separating or undergoing gelling.
  • the present invention aims to produce long shelf stable aqueous silicone emulsions.
  • the use of these emulsifiers overcomes the problem of prior art emulsions where the treated surface is wettable.
  • an advantage of the emulsions of the present invention is that it has been found that the penetration depth of the emulsions prepared by the method of this invention is considerably higher than that obtained by similar compositions of the prior art.
  • Another advantage of the emulsions prepared by the method of this invention is that the emulsions may contain no solvent and they can be considered as environmentally friendly products which comply with the volatile organic compound (VOC) regulations.
  • VOC volatile organic compound
  • hydrolysable alkylalkoxysiloxane having the general formula:
  • R represents a hydrocarbyl group containing from 1 to 30 carbon atoms
  • b is 0, 1 or 2
  • R' represents an aliphatic group containing from 1 to 10 carbon atoms
  • a surfactant selected from the group consisting of an alkylamine alkoxylate, an acidified or partially acidified alkylamine alkoxylate, quaternary alkyl ammonium salts, acid alkylamine salts and imidazoline salts; and 50% to 98% by weight of water.
  • the invention also provides an aqueous siloxane/silane emulsion as described above further comprising up to 45% by weight of an alkylalkoxysilane of the general formula
  • the present invention also provides a method of making aqueous siloxane and siloxane/silane emulsions comprising effective amounts of: (1 ) a hydrolysable siloxane, (2) optionally a hydrolysable silane, (3) a surfactant which is an alkylamine alkoxylate and (4) water. Solvent may additionally be added in this method. However, this is not necessary or desirable in most cases.
  • the present invention also provides a process for achieving water repellency for permeable masonry by applying to the surface of the permeable substrate a composition containing the emulsion as above defined and allowing the composition to cure.
  • masonry means any permeable inorganic substrate that consists of or contains constituents capable of reacting with siloxanes or silanes.
  • Masonry materials containing hydroxy groups or metal oxides can react with siloxanes or silanes so that a siloxane film can be formed in the surface capillaries.
  • the building materials best fulfilling these requirements are concrete, light clinker and light ballast concrete, lightweight concrete, mortars, plaster of Paris and products prepared from gypsum, fibre cement, materials and products prepared from fired or sintered clay, ballast and fibre containing silica or glass.
  • the emulsions prepared by the method of this invention are useful for rendering any permeable substrates that possess latent alkalinity or latent catalytic activity, water repellent. It is believed that the latent alkalinity of such substrates promotes the hydrolysis and condensation of the alkylalkoxysilane and alkylalkoxysiloxane into a resinous silicone matrix which is permanently formed and deposited within the interior capillaries of the substrates.
  • the masonry to be treated with the water repellent compositions in this invention is preferably dry, although it may be somewhat wet.
  • the hydrolysable alkoxysiloxanes (1 ) useful in the method of this invention generally have an average molecular weight in excess of 300 and up to about 3000. It should be noted that mixtures of various siloxanes may be used, if desired.
  • the preferred hydrolysable alkoxysiloxane having the general formula: R Si(OR') b O 3 . b
  • R is C-, - C 30 hydrocarbyl, or halogenated hydrocarbyl group and R' is a C-, - C 6 alkyl group.
  • the hydrocarbyl group may be alphatic, or cyloaliphatic, or aralkyi, or aryl. This hydrocarbyl group may also contain one or more halogen substituents, and/or nitrogen oxygen or sulfur hetero atoms.
  • R is preferably methyl, ethyl, propyl, butyl, pentyl, hexyl, octyl, nonyl or decyl.
  • the R groups attached to silicon will contain a proportion of alkyl with more than three carbon atoms.
  • R' is preferably a methyl or ethyl group.
  • the hydrolysable alkylalkoxysilanes (2) useful in the method of this invention generally have an average molecular weight in excess of 135 and preferably greater than 190 up to about 600 for the monomers. It should be noted that mixtures of various silanes may be used, if desired.
  • the preferred hydrolysable alkylalkoxysilane (2) having the general formula:
  • R" n - Si - R" n ID wherein R" is a C, - C 30 hydrocarbyl, or halogenated hydrocarbyl group and R'" is a C, - C 6 alkoxy group, and n is 1 or 2.
  • the hydrocarbyl group may be aliphatic, or cycloaliphatic, or aralkyi, or aryl. These hydrocarbyl radicals may also contain one or more halogen substituents, and/or nitrogen, oxygen or sulfur hetero atoms.
  • R" is preferably propyl, butyl, pentyl, hexyl, octyl, nonyl or decyl.
  • R" will contain more than three carbon atoms.
  • R'" is preferably a methoxy or ethoxy group and most preferably an ethoxy group.
  • Silanes that are useful in accordance with the present invention include, but are not limited to: methyltrimethoxysilane, butyltriethoxysilane, octyltriisopropoxysilane, methyltriethoxysilane, n-hexyltrimethoxysilane, 2-ethylhexyltrimethoxysilane, methyltri-n-propoxysilane, 6-chlorohexyltrimethoxysilane,
  • the emulsions prepared by the method of this invention consist of one to about fifty percent by weight of the mixtures of alkylalkoxysiloxanes and alkylalkoxysilanes or mixtures of silanes, and preferably the emulsions include two to fifty percent by weight of the mixture of siloxanes and silanes.
  • the siloxane component (1 ) is present in an amount of from about 10 to 100 parts by weight and the silane component (2) is present in from about 0 to 90 parts by weight of the total siloxane/silane mixture.
  • part of the silane component may be substituted by aliphatic solvent.
  • the surfactant (3) is also included.
  • ionic and non-ionic surfactants are unable to achieve a satisfactorily stable emulsion with good penetration effect on substrates and good surface beading effect.
  • the surfactants useful in the present invention which achieve these effects are surfactants such as alkylamine alkoxylates, quaternary alkyl ammonium salts, and alkylamine and imidazoline salts.
  • Alkylamine ethoxylates that are useful in accordance with the present invention include, but are not limited to: Ethoxylated long chain amines
  • Alkyl polyamine ethoxylates Alkyl polyoxyethylene amines Ethoxylated amines Fatty amine ethoxylates Polyoxyethylated fatty amines
  • alkylamine ethoxylate surfactants which may be used in accordance herewith include, but are not limited to the following: - Terics 12M2, 12M5, 12M1 5, 13M15, 16M2, 16M5,
  • the surfactants other than alkylamine alkoxylates are able to be used when alkylalkoxysilanes are present in the emulsions, when only alkylalkoxysiloxanes are present these other surfactants are not recommended for use.
  • Quaternary ammonium surfactants which may be employed in the present invention include, but are not limited to: Cetyltrimethylammonium chloride - Vantoc CC30 Cetyltrimethylammonium bromide - Vantoc N40
  • alkylamine alkoxylates as surfactants in this invention is that this kind of surfactant will be deactivated and cause no wetting effect of the final treated surface when the emulsion is applied onto masonry surfaces. This is due to the positively charged nitrogen reacting with the negatively charged substrate surface to leave its hydrocarbon group oriented towards the surface. In addition, by adjusting the level of acid, a proper HLB for the surfactant for the system may be obtained. Within the protonated alkylamine ethoxylate there is exhibited both cationic surfactant properties and non-ionic surfactant properties in the one emulsifier.
  • the emulsions prepared by the method of this invention consist of 0.1 to about 10 percent by weight of the emulsifier, and preferably the emulsions include from 1 to about 5 percent by weight of the emulsifier.
  • the emulsions prepared by the art of the present invention are very stable and have extremely fine particle sizes.
  • the emulsions also have a long shelf life and can be diluted to any appropriate concentration without changing their stability.
  • the total system was then shear mixed at the same speed for at least 10 minutes with external cooling by tap water which was at approximately 20°C.
  • the final emulsion contained 50% silicone by weight. It was milky white and stable and had an average particle size of 1 .1 5 urn.
  • EXAMPLE II 0.56 Grams of octadecylamine ethoxylates with two ethoxylate units (Teric 16M2) was added into 10.32 grams of water in a cylindrical flask. 10% Acetic acid solution was added to the flask to adjust the pH to approximately 7. Then water was added to make the total aqueous phase up to 12.00 grams. 9.00 Grams of a methoxy octyl/methyl siloxane (BS1268 from Wacker-Chemie GmbH Kunststoff) was mixed with 3.00 grams of isobutyltriethoxysilane as the organic phase.
  • BS1268 methoxy octyl/methyl siloxane
  • the organic phase was added dropwise into the aqueous phase during shear mixing with an Ultra-Turrax T25 shear mixer at a speed of 1 3,500 rpm.
  • the total system was then shear mixed at the same speed for at least 10 minutes with external cooling by tap water which was at approximately 20°C.
  • the final emulsion contained 50% silicone by weight. It was milky white and stable and had an average particle size of 0.60 um.
  • EXAMPLE III 0.56 Grams of octadecylamine ethoxylates with two ethoxylate units (Teric 16M2) was added into 10.32 grams of water in a cylindrical flask. 10% Acetic acid solution was added to the flask to adjust the pH to approximately 7. Then water was added to make the total aqueous phase up to 12.00 grams. 6.00 Grams of methoxy octyl/methyl siloxane (BS1268 from Wacker-Chemie GmbH Kunststoff) was mixed with 6.00 grams of isobutyltriethoxysilane as the organic phase.
  • the organic phase was added dropwise into the aqueous phase during shear mixing with an Ultra-Turrax T25 shear mixer at a speed of 13,500 rpm.
  • the total system was then shear mixed at the same speed for at least 10 minutes with external cooling by tap water which was at approximately 20°C.
  • the final emulsion contained 50% silicone by weight. It was milky white, stable and had an average particle size of 0.45 um.
  • EXAMPLE IV 0.56 Grams of octadecylamine ethoxylates with two ethoxylate units (Teric 16M2) was added into 10.32 grams of water in a cylindrical flask. 10% Acetic acid solution was added to the flask to adjust the pH to approximately 7. Then water was added to make the total aqueous phase up to 12.00 grams. 3.00 Grams of methoxy octyl/methyl siloxane (BS1268 from Wacker-Chemie GmbH Kunststoff) was mixed with 9.00 grams of isobutyltriethoxysilane as the organic phase.
  • the organic phase was added dropwise into the aqueous phase during shear mixing with an Ultra-Turrax T25 shear mixer at a speed of 13,500 rpm.
  • the total system was then shear mixed at the same speed for at least 10 minutes with external cooling by tap water which was at approximately 20°C.
  • the final emulsion contained 50% silicone by weight. It was milky white, stable and had an average particle size similar to that of example III.
  • EXAMPLE V 0.56 Grams of octadecylamine ethoxylates with two ethoxylate units (Teric 16M2) was added into 10.32 grams of water in a cylindrical flask. 10% Acetic acid solution was added to the flask to adjust the pH to approximately 7. Then water was added to make the total aqueous phase up to 12.00 grams. 9.00 Grams of methoxy octyl/methyl siloxane (BS1268 from Wacker-Chemie
  • EXAMPLE VI 0.56 Grams of octadecylamine ethoxylates with two ethoxylate units (Teric 16M2) was added into 10.32 grams of water in a cylindrical flask. 10% Acetic acid solution was added to the flask to adjust the pH to approximately 7. Then water was added to make the total aqueous phase up to 12.00 grams. 6.00 Grams of methoxy octyl/methyl siloxane (BS1268 from Wacker-Chemie GmbH Kunststoff) was mixed with 6.00 grams of octyltriethoxysilane as the organic phase.
  • the organic phase was added dropwise into the aqueous phase during shear mixing with an Ultra-Turrax T25 shear mixer at a speed of 13,500 rpm.
  • the total system was then shear mixed at the same speed for at least 10 minutes with external cooling by tap water which was at approximately 20°C.
  • the final emulsion contained 50% silicone by weight. It was milky white, stable and had an average particle size of 0.47 um.
  • EXAMPLE VII 0.56 Grams of octadecylamine ethoxylates with two ethoxylate units (Teric 1 6M2) was added into 10.32 grams of water in a cylindrical flask. 10% Acetic acid solution was added to the flask to adjust the pH to approximately 7. Then water was added to make the total aqueous phase up to 12.00 grams. 3.00 Grams of methoxy octyl/methyl siloxane (BS1268 from Wacker-Chemie GmbH Kunststoff) was mixed with 9.00 grams of octyltriethoxysilane as the organic phase.
  • EXAMPLE X 0.24 Grams of octadecylamine ethoxylates with two ethoxylate units (Teric 16M2) was added into 10.76 grams of water in a cylindrical flask. 10% Acetic acid was added to the flask to adjust the pH to approximately 7. Then water was added to make the total aqueous phase up to 12.00 grams. 6.00 Grams of methoxy octyl/methyl siloxane (BS1268 from Wacker-Chemie GmbH Kunststoff) was mixed with 6.00 grams of octyltriethoxysilane as the organic phase.
  • BS1268 methoxy octyl/methyl siloxane
  • the final emulsion contained 50% silicone by weight. It was milky white, stable and had an average particle size of 0.56 um.
  • EXAMPLE XI 0.06 Grams of octadecylamine ethoxylates with two ethoxylate units (Teric 16M2) was added into 10.94 grams of water in a cylindrical flask. 10% Acetic acid was added to the flask to adjust the pH to approximately 7. Then water was added to make the total aqueous phase up to 12.00 grams. 6.00 Grams of methoxy octyl/methyl siloxane (BS1268 from Wacker-Chemie GmbH Kunststoff) was mixed with 6.00 grams of octyltriethoxysilane as the organic phase.
  • the substrate was cured for at least 7 days (the substrate achieves a constant weight).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
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  • Wood Science & Technology (AREA)
  • Aftertreatments Of Artificial And Natural Stones (AREA)

Abstract

L'invention concerne des émulsions aqueuses de siloxane et de siloxane/silane, ainsi qu'un procédé de préparation de ces émulsions. L'émulsion aqueuse de siloxane préparée selon l'invention comprant: (i) alkylalkoxysiloxane hydrolysable ayant la formule générale (I) dans laquelle R représente un groupe hydrocarbyl contenant de 1 à 30 atomes de carbone, b vaut 0,1 ou 2, et R' représente un groupe aliphatic contenant de 1 à 10 atomes de carbone; (ii) 0,1 % à 10 % en poids d'un tensioactif sélectionné dans le groupe comprenant alkylamine alkoxylate ou alkylamine alkoxylate acidifié ou partiellement acidifié, des sels d'alkyle ammonium quaternaire, des sels d'alkylamine acide et des sels d'imidazoline; et (iii) de l'eau. Selon l'invention, jusqu'à 45 % en poids de l'émulsion peuvent consister en alkylalkoxysilane ayant la formule R'n - Si - R''' 4-n, formule dans laquelle R' est un groupe hydrocarbyl contenant de 1 à 20 atomes de carbone, R''' est un groupe hydrolisable, et n vaut 1 ou 2. Ces émulsions maintiennent effectivement des niveaux élevés de la concentration de silicone active dans des conditions de stockage de longue durée. Les émulsions de l'invention sont utiles pour rendre hydrofuge des substrats minéraux perméables.
PCT/AU1995/000085 1994-02-21 1995-02-21 Compositions aqueuses pour le traitement hydrofuge d'ouvrages de maçonnerie Ceased WO1995022580A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU18018/95A AU689224B2 (en) 1994-02-21 1995-02-21 Aqueous compositions for the water repellent treatment of masonry

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPM3997A AUPM399794A0 (en) 1994-02-21 1994-02-21 Aqueous compositions for the water repellent treatment of masonry
AUPM3997 1994-02-21

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FR2749588A1 (fr) * 1996-06-10 1997-12-12 Rhone Poulenc Chimie Emulsion aqueuse de resine silicone pour l'hydrofugation de materiaux de construction
EP2065431A1 (fr) 2007-11-30 2009-06-03 Wacker Chemie AG Dispersions aqueuses contenant de composés à base de silicium organique
US10829505B2 (en) 2016-04-20 2020-11-10 Dow Silicones Corporation Lithium alkylsiliconate composition, coating, and method of making same
WO2021126175A1 (fr) 2019-12-18 2021-06-24 Wacker Chemie Ag Dispersions aqueuses de composés d'organosilicium

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US5091002A (en) * 1989-04-08 1992-02-25 Th. Goldschmidt Ag Preparation for the water-repellent impregnation of porous mineral building materials
US5110684A (en) * 1990-11-07 1992-05-05 Dow Corning Corporation Masonry water repellent
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US5393330A (en) * 1993-06-30 1995-02-28 Osi Specialties, Inc. Cationic emulsions of alkylalkoxysilanes

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2749588A1 (fr) * 1996-06-10 1997-12-12 Rhone Poulenc Chimie Emulsion aqueuse de resine silicone pour l'hydrofugation de materiaux de construction
WO1997047569A1 (fr) * 1996-06-10 1997-12-18 Rhodia Chimie Emulsion aqueuse de resine silicone pour l'hydrofugation de materiaux de construction
EP2065431A1 (fr) 2007-11-30 2009-06-03 Wacker Chemie AG Dispersions aqueuses contenant de composés à base de silicium organique
DE102007047907A1 (de) 2007-11-30 2009-06-04 Wacker Chemie Ag Wässrige Dispersionen von Organosiliciumverbindungen
US8449666B2 (en) 2007-11-30 2013-05-28 Wacker Chemie Ag Aqueous dispersions of organosilicon compounds
US10829505B2 (en) 2016-04-20 2020-11-10 Dow Silicones Corporation Lithium alkylsiliconate composition, coating, and method of making same
WO2021126175A1 (fr) 2019-12-18 2021-06-24 Wacker Chemie Ag Dispersions aqueuses de composés d'organosilicium

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