EP1890870A1 - Revetement ignifuge destine a etre utilise dans un tunnel - Google Patents

Revetement ignifuge destine a etre utilise dans un tunnel

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Publication number
EP1890870A1
EP1890870A1 EP06805622A EP06805622A EP1890870A1 EP 1890870 A1 EP1890870 A1 EP 1890870A1 EP 06805622 A EP06805622 A EP 06805622A EP 06805622 A EP06805622 A EP 06805622A EP 1890870 A1 EP1890870 A1 EP 1890870A1
Authority
EP
European Patent Office
Prior art keywords
layer
hydrogel
fire protection
protection coating
fire
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.)
Withdrawn
Application number
EP06805622A
Other languages
German (de)
English (en)
Inventor
Fabio Würmli
André Schiegg
Norman Blank
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.)
Sika Technology AG
Original Assignee
Sika Technology AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sika Technology AG filed Critical Sika Technology AG
Priority to EP06805622A priority Critical patent/EP1890870A1/fr
Publication of EP1890870A1 publication Critical patent/EP1890870A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
    • 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
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • 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
    • C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
    • 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
    • C04B41/70—Coating or impregnation for obtaining at least two superposed coatings having different compositions
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00146—Sprayable or pumpable mixtures
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures

Definitions

  • the invention relates to the field of fire protection coatings, ie coatings with high fire resistance properties for concrete structures, especially for tunnels. Furthermore, the invention relates to the use of a composition comprising water, a solid matrix, preferably hydraulic binders, and hydrogel-forming polymers as fire retardants.
  • Fire protection materials for constructions made of concrete are known.
  • plastic or glass fibers, as well as perlite or vermiculite are added in cementitious systems to optimize the fire resistance in a fire.
  • EP 1'326'811 B1 describes a material which is produced from a hydraulically setting mixture containing calcium silicate.
  • hydrogel-forming polymers also called superabsorbent polymers (SAP)
  • SAP superabsorbent polymers
  • EP 1'329'435 A1 describes a mixture of hydrogel-forming polymers and hydraulically setting building materials.
  • BEST ⁇ TIGUNGSKOPSE In construction chemistry, there is a great need to provide new fire protection materials that are fire-resistant and that are easy to process.
  • the present invention has for its object to provide a fire retardant that can withstand fire for a long time, and to provide a fire-resistant coating that is hardenable and sprayable.
  • a fire retardant comprising a solid matrix, preferably a hydraulic binder, and hydrogel-forming polymers which contain water, and by a multi-layer fire protection coating.
  • Fire retardant is understood to mean a composition, preferably a hydraulically setting composition comprising water, at least one hydrogel-forming polymer and at least one solid matrix, preferably a hydraulically setting binder.
  • Fire protection coating is understood to mean a multilayer coating according to the invention which comprises at least one first layer, the water, at least one hydrogel-forming polymer and at least one hydraulic bonding binder, and at least one second layer comprising at least one organic polymer comprises or consists of.
  • the advantage of the present invention is that the hydrogel-forming polymers store some of the mixing water which evaporates at elevated temperature in the event of a fire and the vapor phase, ie the phase at which the temperature inside and at the surface of the fire protection coating at a fire in the boiling temperature of the water, ie at about 90 - 100 0 C remains, extended to at least 10 minutes, preferably at least 20 minutes, more preferably at least 30 minutes.
  • the temperature in the interior of the fire protection coating as well as on the surface between the first layer and the substrate after the vapor phase is reduced and remains for a long time, ie for more than 2 to 3 hours below 500 0 C, preferably below 400 ° C, particularly preferred Below 300 0 C, and thus the strength of the fire protection coating and the underlying material is maintained in a fire for a long time.
  • a multi-layer fire protection coating with at least one first layer and at least one second layer, wherein the first layer is partially, preferably over the entire surface of the second layer covered.
  • the second layer allows the water to be stored for a long time in the hydrogel-forming polymers of the first layer.
  • the coating of the first layer with the second layer achieves that part, preferably at least 20% or at least 30%, more preferably at least 40%, even more preferably at least 50% of the water initially taken up by the hydrogel-forming polymers over a longer period of time , That is, stored over several months, preferably over several years in the hydrogel-forming polymers of the first layer, and that the evaporation of the water can be delayed.
  • first layers and multiple second layers may be applied to provide even better protection.
  • a first layer, then a second layer, then a first layer, and again a second layer, i.e., a second layer are deposited on the substrate. alternately a first and a second layer is applied.
  • the fire protection coating according to the invention may also consist of a first layer which is applied to the substrate, then of a second layer comprising at least one at least partially water-loaded hydrogel-forming polymer which is applied to the first layer and then of a further second layer without hydrogel-forming polymers applied to the second layer comprising hydrogel-forming polymers, or the second layer without hydrogel-forming polymers can be applied to the first layer and then the second layer comprising hydrogel-forming polymers to the second Layer can be applied without hydrogel-forming polymers.
  • the fire protection coating according to the invention may contain a further layer between the substrate and the first layer.
  • the further layer can be used to allow the time over which a portion of the initial hydrogel-forming polymer has been taken up
  • the first layer is thus coated on both sides, preferably completely covered on both sides.
  • the further layer can also serve for better adhesion or reinforcement of concrete structures.
  • a further advantage of the present invention is that the first layer of the fire protection coating according to the invention has good adhesion to a mineral substrate.
  • Fig. 1 A schematic cross section of a fire protection coating
  • the present invention relates to a fire protection coating on a solid mineral substrate comprising at least a first layer of a cured hydraulically setting composition comprising water, at least one hydrogel-forming polymer and at least one hydraulically setting binder and at least one second layer comprising at least one organic polymer , wherein the second layer is preferably arranged on the side of the fire protection coating facing a possible fire.
  • the hydraulically setting composition of the first layer 1 comprises at least one hydraulically setting binder, in particular a mineral binder such as cement, gypsum, fly ash or slag.
  • Preferred hydraulic binders comprise at least one cement, in particular at least one cement according to Euronorm EN 197 or calcium sulfate, in the form of anhydrite, hemihydrate or dihydrate gypsum; or calcium hydroxide.
  • Portland cements, sulfoaluminate cements and high-alumina cements, in particular Portland cement, are preferred. Mixtures of Cements can lead to particularly good properties.
  • the hydraulically setting composition of the first layer 1 of the novel fire protection coating contains hydrogel-forming polymers in addition to hydraulically setting binders in such an amount that their proportion, based on the dry weight of the hydraulically setting composition, that is based on the total weight of the composition without water, 0 , 01 to 15 wt .-%, preferably 0.1 to 10 wt .-% and particularly preferably 1 to 5 wt .-% is.
  • Hydrogel-forming polymers are, in particular, polymers of homopolymerized or copolymerized hydrophilic monomers, graft (co) polymers of one or more hydrophilic monomers onto a suitable graft base, crosslinked cellulose or starch ethers, crosslinked carboxymethylcellulose, partially crosslinked polyalkylene oxide or natural products swellable in aqueous liquids, such as guar derivatives, alginates and carrageenans.
  • Suitable grafting bases may be of natural or synthetic origin. Examples are starch, agar, agarose, dextran, cellulose or cellulose derivatives and other polysaccharides and oligosaccharides, polyvinyl alcohol, polyalkylene oxides, in particular polyethylene oxides and polypropylene oxides, polyamines, polyamides and hydrophilic polyesters.
  • hydrogel-forming polymers preference is given to crosslinked polymers having acid groups which are predominantly in the form of their salts, generally alkali metal. or ammonium salts. Such polymers swell on contact with aqueous liquids particularly strong gels.
  • Such monomers carrying acid groups are, for example, monoethylenically unsaturated C3- to C25-carboxylic acids or anhydrides such as acrylic acid, methacrylic acid, ethacrylic acid, alpha-chloroacrylic acid, crotonic acid, maleic acid, maleic anhydride, itaconic acid, citraconic acid, mesaconic acid, glutaconic acid, aconitic acid and fumaric acid.
  • monoethylenically unsaturated C3- to C25-carboxylic acids or anhydrides such as acrylic acid, methacrylic acid, ethacrylic acid, alpha-chloroacrylic acid, crotonic acid, maleic acid, maleic anhydride, itaconic acid, citraconic acid, mesaconic acid, glutaconic acid, aconitic acid and fumaric acid.
  • monoethylenically unsaturated sulfonic or phosphonic acids for example vinylsulfonic acid, allylsulfonic acid, sulfoethyl acrylate, sulfomethacrylate, sulfopropyl acrylate, sulfopropyl methacrylate, 2-hydroxy-3-acryloxypropylsulfonic acid, 2-hydroxy-3-methacrylic oxypropylsulfonic acid,
  • Vinylphosphonic acid allylphosphonic acid, styrenesulfonic acid and 2-acrylamido-2-methylpropanesulfonic acid.
  • the monomers can be used alone or mixed with one another.
  • Preferably used monomers are acrylic acid, methacrylic acid, vinylsulfonic acid, acrylamidopropanesulfonic acid or mixtures of these acids, for.
  • mixtures of acrylic acid and methacrylic acid mixtures of acrylic acid and acrylamidopropane-sulfonic acid or mixtures of acrylic acid and vinylsulfonic acid.
  • a particularly preferably used monomer is acrylic acid.
  • additional monoethylenically unsaturated compounds which do not carry acid groups, but are copolymerizable with the acid group-carrying monomers.
  • these include, for example, the amides and nitriles of monoethylenically unsaturated carboxylic acids, e.g. Acrylamide, methacrylamide and N-vinylformamide, N-vinylacetamide, N-methylvinylacetamide, acrylonitrile and methacrylonitrile.
  • Suitable amides are, for example, acrylic acid and methacrylic acid amides of alkoxylated monohydric, saturated alcohols, eg.
  • Other suitable compounds include vinyl esters of saturated C1 to C4 carboxylic acids such as vinyl formate, vinyl acetate or vinyl propionate, alkyl vinyl ethers having at least 2 carbon atoms in the alkyl group, such as. Ethyl vinyl ether or butyl vinyl ether, esters of monoethylenically unsaturated C3 to C6 carboxylic acids, e.g. B.
  • maleic acid mono-methyl ester N-vinyl lactams such as N-vinylpyrrolidone or N-vinylcaprolactam
  • acrylic acid and methacrylic acid esters of alkoxylated monohydric, saturated alcohols eg. B.
  • Suitable monomers are styrene and alkyl-substituted styrenes such as ethylstyrene or tert-butylstyrene.
  • acid group-carrying monomers can also be used in mixture with other monomers, for. B. mixtures of vinyl acetate and 2-hydroxyethyl in any ratio. These non acid group-carrying monomers are added to the reaction mixture in amounts of between 0 and 50% by weight, preferably less than 20% by weight.
  • Crosslinkers which can function are compounds which have at least two ethylenically unsaturated double bonds.
  • Examples of compounds of this type are N, N'-methylenebisacrylamide, polyethylene glycol diacrylates and polyethylene glycol dimethacrylates, each of which is derived from polyethylene glycols having a molecular weight of from 106 to 8500 g / mol, preferably from 400 to 2000 g / mol, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, ethylene glycol diacrylate, ethylene glycol diisocyanate.
  • crosslinkers are compounds which contain at least one polymerizable ethylenically unsaturated group and at least one further functional group.
  • the functional group of these crosslinkers must be able to react with the functional groups, essentially the acid groups, of the monomers.
  • Suitable functional groups are, for example, hydroxyl, amino, epoxy and aziridino groups. Can be used for.
  • 2-hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate and hydroxybutyl methacrylate allylpiperidinium bromide, N-vinylimidazoles such as. B.
  • N-vinylimidazole, 1-vinyl-2-methylimidazole and N-vinylimidazolines such as N-vinylimidazoline, 1-vinyl-2-methylimidazoline, 1-vinyl-2-ethylimidazoline or 1-vinyl-2-propylimidazoline, in the form of free bases, in quaternized form or as a salt in the polymerization can be used.
  • the basic esters are preferably used in quaternized form or as a salt.
  • z. B. also glycidyl (meth) acrylate can be used.
  • crosslinkers are compounds which contain at least two functional groups which are capable of reacting with the functional groups, essentially the acid groups of the monomers.
  • the functional groups suitable for this purpose have already been mentioned above, ie hydroxyl, amino, epoxy, isocyanate, ester, amido and aziridino groups.
  • crosslinkers examples include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, glycerol, polyglycerol, thethanolamine, propylene glycol, polypropylene glycol, block copolymers of ethylene oxide and propylene oxide, ethanolamine, sorbitan fatty acid esters, ethoxylated sorbitan fatty acid esters, trimethylolpropane, pentaerythritol, 1,3-butanediol, 1, 4-butanediol, polyvinyl alcohol, sorbitol, starch, polyglycidyl ethers such as ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerol diglycidyl ether, glycerol polyglycidyl ether, diglycerol polyglycidyl ethers, polyglycerol polyglycidyl ethers, poly
  • crosslinkers are polyvalent metal ions capable of forming ionic crosslinks. Examples of such crosslinkers are magnesium, calcium, barium and aluminum ions. These crosslinkers are used for example as hydroxides, carbonates or bicarbonates.
  • Other suitable crosslinkers are multifunctional bases which are also capable of forming ionic crosslinks, for example polyamines or their quaternized salts. Examples of polyamines are ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine and polyethyleneimines, and also polyamines having molar masses of up to 40,000 g / mol in each case.
  • mixtures of different polymerization initiators for. B. mixtures of hydrogen peroxide and sodium or potassium peroxodisulfate. Mixtures of hydrogen peroxide and sodium peroxodisulfate can be used in any proportion.
  • Suitable organic peroxides are, for example, acetylacetone peroxide, methyl ethyl ketone peroxide, tert-butyl hydroperoxide, cumene hydroperoxide, tert-amyl perpivalate, tert-butyl perpivalate, tert-butyl pheohexanoate, tert-butyl perisobutyrate, tert-butyl per-2-ethylhexanoate, tert.
  • Particularly suitable polymerization initiators are water-soluble azo initiators, e.g. 2,2'-azobis (2-methylpropionitrile), 2,2'-azobis (2-amidinopropane) dihydrochloride, 2,2'-azobis (N, N'-dimethylene) isobutyramidine dihydrochloride ) 2- (carbamoylazo) isobutyronitrile, 2,2'-azobis [2- (2'-imidazolin-2-yl) propane] dihydrochloride and 4,4'-azobis (4-cyanovaleric acid).
  • the polymerization initiators mentioned are used in conventional amounts, for. B. in amounts of 0.01 to 5, preferably 0.05 to 2.0 wt .-%, based on the monomers to be polymerized.
  • the neutralization degree can be adjusted before, during or after the polymerization in all suitable apparatuses.
  • the neutralization can also be carried out directly herein, for example when using a kneader for polymerization.
  • the cured hydraulically setting composition preferably contains at least one hydrogel-forming polymer which is wholly or partially swollen by water, i. in wet or partly wet condition.
  • Preferred hydrogel-forming polymers have been found to be polymers which can take up more than five times, preferably more than ten times and less than one hundred times, preferably less than sixty times, the own weight of liquid, preferably water. That is, 1 g of hydrogel-forming polymer can preferably receive 1 g to 100 g of liquid, more preferably 5 g to 80 g of liquid, particularly preferably 10 g to 60 g of liquid, preferably water.
  • the hydraulically setting composition of the first layer 1 of the fire protection coating according to the invention may comprise, in addition to hydraulic binders and hydrogel-forming polymers, further additives. As additive any liquid or powdered concrete admixtures can be used.
  • accelerators corrosion inhibitors, condensers, thickeners, retarders, Schwlashduzierern, defoamers, etc.
  • additives such as solidification accelerators, corrosion inhibitors, plasticizers, etc.
  • accelerators which are marketed by Sika® under the name Sigunit® are important for the spraying of concrete.
  • those which are sold by Sika®, for example under the name ViscoCrete® can be used as the plasticizer or retarder.
  • alkanolamines for example, alkanolamines, alcohols, organic acids, phosphonates can be used.
  • Alkanolamines in particular ethanolamines or N-alkylated ethanolamines are suitable, preferably selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine, N-methyldiethanolamine, N 1 N-dimethylethanolamine, and mixtures thereof.
  • the hydraulically setting composition of the first layer 1 contains additives such as gravel, sand, quartz, but also expanded clay, pumice, polystyrene, perlite or vermiculite.
  • additives for a fire protection coating are perlite or vermiculite, which improve the thermal conductivity.
  • the first layer 1 of the fire protection coating comprises further additives with high fire protection properties, such as fibers such as glass or plastic fibers, in particular polyethylene or polypropylene fibers, other plastic additives, graphite, especially inflated graphite, or calcium silicates such as xonotlite.
  • the hydraulically setting composition of the first layer 1 is preferably present as shotcrete or sprayed mortar.
  • Fire protection coating comprises at least one organic polymer or consists of organic polymer.
  • the second layer 2 consists of at least 50% by weight, preferably at least 60% by weight, more preferably at least 70 or 80% by weight, or even up to 100% by weight, based on the total weight of the second layer organic polymer.
  • Suitable organic polymers are in particular those organic polymers which are obtained by free-radical polymerization or addition polymerization of monomers or oligomers.
  • a preferred polymer obtained via free radical polymerization is a homo- or copolymer of unsaturated double bond monomers, especially those selected from the group consisting of (meth) acrylic acid, (meth) acrylic acid esters, acids and esters of unsaturated dicarboxylic acids, vinyl esters, vinyl alcohols , Styrene, ethene, propene, butene, butadiene, and acrylonitrile and their mono- or polyhalogenated analogs.
  • the polymerization of the monomers takes place by means of a free-radical initiator, in particular peroxides or hydroperoxides. Particularly preferred are homo- and copolymers of vinyl acetate. Details for the preparation of these polymers are known to those skilled in the radical polymerization of unsaturated monomers.
  • the coating may be carried out by simultaneously applying and mixing the monomers and the free radical initiator, or immediately after mixing monomer and free radical initiator.
  • the application of the second layer 2 on the first layer 1 of the inventive fire protection coating can be done by spraying, rolling, brushing or coating. Particularly preferred is the spray application, in particular by means of a two-component spray gun.
  • a polymer obtained by addition polymerization is in particular a cured epoxy resin, polyurethane or polyester.
  • Suitable polyurethanes are obtainable by the reaction of polyisocyanates or isocyanate-group-containing prepolymers and water, in particular as atmospheric moisture or from the first layer, or with polyols and / or polyamines.
  • Isocyanate group-containing prepolymers are reaction products of said polyisocyanates with polyols having two or more hydroxyl groups, for example dihydric or polyhydric alcohols, glycols or aminoalcohols, polyhydroxy-functional polyethers, polyesters, polyacrylates or polycarbonates, in particular polyoxyalkylene polyols.
  • This reaction of the preparation of prepolymers containing isocyanate groups is familiar to the person skilled in the art of polyurethane chemistry and typically takes place in a slightly increased stoichiometric excess of the isocyanate groups relative to the hydroxyl groups.
  • Preferred polyols are polyoxyalkylene polyols, also called polyether polyols, which are polymerization products of ethylene oxide, 1, 2-propylene oxide,
  • 1,2- or 2,3-butylene oxide, tetrahydrofuran or mixtures thereof are, possibly polymerized with the aid of a starter molecule having two or more active hydrogen atoms such as water, ammonia or compounds having several OH or NH groups such as 1, 2- Ethanediol, 1, 2- and 1, 3-propanediol, neopentyl glycol, diethylene glycol, triethylene glycol, the isomeric dipropylene glycols and tripropylene glycols, the isomeric butanediols, pentanediols, hexanediols, heptanediols, octanediols, nonanediols, decanediols, undecanediols, 1, 3 and 1, 4-cyclohexanedimethanol, bisphenol A, hydrogenated bisphenol A, 1,1,1-trimethylolethane, 1,1,1-tri
  • the reaction of the polyisocyanates or isocyanate-group-containing prepolymers can be done on the one hand with water.
  • the composition comprising polyisocyanates or isocyanate group-containing prepolymers is applied to the surface of the first layer 1.
  • This variant has the great advantage that a so-called one-component polyurethane composition can be used and no previous mixing is necessary.
  • the application of the second layer 2 on the first layer 1 of the inventive fire protection coating can be done by spraying, rolling, brushing or coating. Particularly preferred is the spray application.
  • prepolymers can be made with polyamines and / or polyols.
  • polyols / and or polyamines are known immediately prior to application in a specialist for two-component polyurethane chemistry
  • the application can be carried out by simultaneous application and mixing of the polyisocyanates or isocyanate-group-containing prepolymers and the polyamine or polyol or immediately after their mixing.
  • the application of the second layer 2 on the first layer 1 of the inventive fire protection coating can be done by spraying, rolling, brushing or coating. Particularly preferred is the spray application, in particular by means of a two-component spray gun.
  • Suitable polyesters are prepared from polyols and dicarboxylic acids. Particularly suitable polyols are the polyols already described for the polyurethanes.
  • Suitable cured epoxy resins are obtained from the reaction of so-called epoxy resins with hardeners.
  • Suitable epoxy resins are especially those which are based on diglycidyl ethers of bisphenol
  • A, F and A / F are based.
  • epoxy resins apply
  • Liquid resins An example of such a liquid resin is Araldite® GY-250 from Huntsman.
  • epoxy resins additionally additionally comprise compounds having low-viscosity epoxy groups, so-called
  • Epoxy reactive diluents Epoxy reactive diluents.
  • at least partially halogenated epoxy resins and / or epoxy reactive diluents are brominated epoxy resins such as, for example, commercially available as DER 593 from Dow Chemicals or Bakelite® EPR 500 from Bakelite.
  • examples for Phosphorus-containing epoxy resins are, for example, those mentioned in US Pat. No. 6,548,627.
  • hardeners are polyamines, in particular the polyamines already mentioned in the case of the polyurethanes, as well as polymercaptans.
  • the epoxy resin is mixed with the hardener and applied.
  • Application can be carried out by simultaneous application and mixing of the polyisocyanates or isocyanate-group-containing prepolymers and the polyamine or polyol or immediately after their mixing.
  • the job can be done by spraying, rolling or coating. Particularly preferred is the spray application, especially after mixing the two components.
  • the epoxy resins can also be cured by means of heat.
  • substances are added which trigger a homopolymerization of the epoxy groups at elevated temperature or which release a polyamine or polymercaptan at elevated temperature.
  • a particularly preferred such substance is dicyanamide (Dicy).
  • Dicy dicyanamide
  • the organic polymer preferably comprises substances which reduce the combustibility of this second layer. These substances may be incorporated as additives in the polymer layer or incorporated into the polymer by chemical bonds.
  • the second layer 2 may comprise, in addition to an organic polymer, further substances, in particular fillers or other suitable auxiliaries.
  • the second layer 2 is preferably cementless.
  • the second layer 2 is diffusion-tight at temperatures below 100 ° C.
  • the second layer 2 may comprise at least one hydrogel-forming polymer in at least partially water-loaded form.
  • the same hydrogel-forming polymers as used for the first layer 1 can be used.
  • a mineral substrate U is preferably natural occurring rock, a wall or concrete in question, especially concrete slabs or a concrete coating, especially in the form of shotcrete, as used for example for tunneling.
  • the present invention relates to a process for producing an inventive
  • Fire protection coating wherein for the production of the first layer 1, the hydraulically setting composition comprising hydrogel-forming polymers and hydraulic binders are mixed with water, the first layer 1 is applied to the solid substrate U in the wet state, and the second layer 2 on the first layer 1 is applied.
  • the hydrogel-forming polymer can be used in both dry and wet, i. water laden or swollen, or partially wet, i. water swollen or partially loaded with water form.
  • the dry or wet hydrogel-forming polymer can be added to a previously prepared hydraulically setting binder / water mixture.
  • the advantage of dry or partially wet hydrogel-forming polymers is that they can further absorb water and thus accelerate the stiffening of the hydraulically setting composition.
  • dry hydrogel-forming polymer and dry hydraulically setting binder are present in the dry hydraulically setting composition which is then mixed with water.
  • the hydrogel-forming polymers can be added to the mixture just prior to spraying, ie just prior to the exit of the mixture of water and the remainder of the hydraulically setting composition from the spray nozzle.
  • a required amount of water is added and the mixture is processed.
  • the amount of water required for the dry hydraulically setting composition without hydrogel-forming polymers depends primarily upon the water / cement ratio commonly used by those skilled in the art. Depending on the amount of added hydrogel-forming polymers, the amount of water added increases.
  • the hydraulically setting composition of the first layer 1 is still applied to the solid mineral substrate U when wet.
  • Either the hydraulically setting composition is applied directly to the substrate, or another layer 1 'such as e.g. a primer is first applied to the substrate U and then the hydraulically setting composition is applied to the further layer 1 '.
  • the first layer 1 is preferably a shotcrete or sprayed mortar, which can be applied to the substrate U or the further layer 1 'either in the dry or in the wet process.
  • the hydraulic binder and the additives and additives are first mixed with the water just before they leave the spray nozzle.
  • all ingredients including water are mixed before spraying.
  • the wet spraying method is preferred.
  • the primer of layer 1 ' may be a cementitious primer or an organic primer.
  • the organic primer in particular primers with alkoxy-containing silanes are preferred as adhesion promoter substances.
  • the second layer 2 is applied to the first layer 1.
  • the application of the second layer 2 can take place shortly after the first layer has been applied, for example when the layer 1 has not yet cured or somewhat later, when the layer 1 has already hardened.
  • the second layer 2 is preferably applied less than 48 hours after application of the first layer 1, more preferably less than 24 hours or less than 12 hours.
  • the second layer 2 is sprayed onto the first layer 1, which is preferably not yet cured.
  • the second layer 2 is brushed onto the first layer 1.
  • the present invention relates to a use of a composition, preferably a hydraulically setting composition as a fire retardant, wherein the composition comprises at least one solid matrix, preferably a hydraulic binder, as well as a hydrogel-forming polymer at least partially laden with water.
  • the solid matrix may also comprise or consist of at least one organic polymer.
  • the organic polymer is a polymer as described above for the second layer 2 of the fire protection coating, with the proviso that this polymer is obtained from oligomers and monomers which are not reactive with water.
  • Particularly advantageous is a hydraulically setting composition for use as a fire retardant, which is present as shotcrete or sprayed mortar.
  • the composition is preferably used as a fire retardant for building construction and civil engineering, in particular for interior structures of buildings, particularly preferably for tunneling. Particularly preferred is the use of a novel fire retardant or a fire protection coating according to the invention for the lining of tunnel inner walls in a new tunnel construction or in the renovation of an existing tunnel.
  • the hydraulically setting composition may be for use as a fire retardant in a cured or still wet condition. Preferably, it is in the cured state.
  • FIG. 2 shows a tunnel cross section with a coated fire protection coating comprising a first layer 1, the water, at least one hydrogel-forming polymer, as well as at least one hydraulically setting binder and a second layer 2, which comprises at least one organic polymer.
  • the fire protection coating is applied to a solid mineral substrate, which in this embodiment comprises rock.
  • the hydraulically setting composition used was Sika®MonoTop® 613 (commercially available from Sika Nurse AG) which, before being mixed with water, contains a defined amount of hydrogel-forming polymers, here SAPTE copolymer type acrylamide-Na acrylate (commercially available from melamine , Slovenia) (see Table 1).
  • SAPTE copolymer type acrylamide-Na acrylate commercially available from melamine , Slovenia
  • Table 1 The amount of SAP TE is given in Table 1 as wt.% Based on the total weight of the dry mix containing Sika®MonoTop® 613 and SAP TE, and additionally as wt.% Based on the weight of cement and SAP TE.
  • the proportion of mixing water added was increased because the hydrogel-forming polymers can take up a multiple of their own weight in liquid.
  • Table 1 shows, among other things, the vapor phase, given in minutes, of a 7 and 28-day test specimen with and without coating and with 0, 2, 5 or 10 wt.% SAP TE. 2. Water retention
  • Figure 4 is a graph of water retention (H 2 O) over up to 84 days (d) of a hydraulically setting composition.
  • a hydraulically setting composition Sika®MonoTop® 613 (commercially available from Sika Nurse AG) containing 10% SAP TE (commercially available from Melamin, Slovenia) and 51% by weight water based on the total weight of the composition was used. Sheets were cast in the size of 16x31 cm and a thickness of 2 cm. Some panels were coated with a Hilti CP 671 C-6 (commercially available from Hilti AG, Switzerland) fire-retardant coating, which was rolled up to a thickness of about 200 ⁇ m using a painter roller to improve water retention 24 hours after the first coat had been applied.
  • Hilti CP 671 C-6 commercially available from Hilti AG, Switzerland

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Abstract

La présente invention concerne le domaine des revêtements ingifuges, c'est-à-dire des revêtements à haute résistance au feu destinés aux constructions en béton, notamment aux tunnels. L'invention concerne également un revêtement ignifuge sur un substrat U minéral solide comprenant au moins une première couche (1) d'une composition à prise hydraulique durcie contenant de l'eau, au moins un polymère hydrogéfiliant et au moins un liant à prise hydraulique ; et au moins une deuxième couche (2) contenant au moins un polymère organique. Eventuellement, le revêtement ignifuge contient une autre couche (1) entre le substrat U et la première couche (1'). L'invention concerne également l'utilisation d'une composition contenant une matrice solide, de préférence, un liant hydraulique, et des polymères hydrogélifiants comme agent ignifuge.
EP06805622A 2005-05-23 2006-05-23 Revetement ignifuge destine a etre utilise dans un tunnel Withdrawn EP1890870A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06805622A EP1890870A1 (fr) 2005-05-23 2006-05-23 Revetement ignifuge destine a etre utilise dans un tunnel

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP05104330A EP1726432A1 (fr) 2005-05-23 2005-05-23 Matière ignifuge pour utilisation dans un tunnel
PCT/EP2006/004885 WO2007016984A1 (fr) 2005-05-23 2006-05-23 Revetement ignifuge destine a etre utilise dans un tunnel
EP06805622A EP1890870A1 (fr) 2005-05-23 2006-05-23 Revetement ignifuge destine a etre utilise dans un tunnel

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EP1890870A1 true EP1890870A1 (fr) 2008-02-27

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DE102007027470A1 (de) * 2007-06-14 2008-12-24 Construction Research & Technology Gmbh Polymervergütete Baustofftrockenmischungen
WO2009068380A1 (fr) * 2007-11-29 2009-06-04 Construction Research & Technology Gmbh Procédé de remblayage d'un tunnel
CN101353489B (zh) * 2008-04-22 2010-09-01 东莞市柏百顺石油化工有限公司 一种环保、吸音的隧道防火涂料
DE102008043516A1 (de) * 2008-11-06 2010-05-12 Wacker Chemie Ag Verfahren zur Applikation von polymermodifizierten Nassbetonmischungen
DE112011104289A5 (de) * 2010-05-26 2013-09-12 KERAPOR GmbH Berlin Brandhemmende Materialmischung
DE102011009980A1 (de) * 2011-02-01 2012-08-02 Peter Heinze Verwendung von superabsorbierenden Polymeren (SAP) als Zusatz zu Schutzbeschichtungen
ES2746291T3 (es) * 2015-06-04 2020-03-05 Sika Tech Ag Composición de acrilato para obturar construcciones de túnel

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US4263365A (en) * 1979-08-02 1981-04-21 John D. Brush & Co., Inc. Fire-resistant safe and panel
GB8419040D0 (en) * 1984-07-26 1984-08-30 Dixon International Ltd Adhesive/cement
DE3506132C2 (de) * 1985-02-22 1994-06-30 Brandschutz Indverband Lichtdurchlässige Festkörperbrandschutzmasse

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