2-COMPONENT COATING COMPOSITION FOR BUILDING SEALING WITH CATALYTIC CONTROLLER-CO-CATALYSATOR SYSTEM

Description

[0001] The invention relates to a 2-component coating composition for building sealing comprising a catalyst-cocatalyst system.

[0002] Sealing roofs, balconies, and terraces using bituminous or polymeric coating materials is common practice. This involves first applying one or more insulating layers to the substrate, which may be made of wood, metal, or concrete. A single or multi-layer sealing layer is then applied. This sealing layer consists of either polymeric or bituminous waterproofing membranes, which are laid across the roof and connection areas and bonded at the edges and overlaps using adhesive sealants, reactive liquid plastics, hot-melt tapes, thermal bonding, or solvent welding.

[0003] For flat roofs with numerous roof penetrations and a slope of less than 10%, as well as for sealing balconies and terraces, reactive liquid plastics are particularly advantageous; these are applied as liquid, essentially solvent-free coating and sealing materials in the roof area and then harden.

[0004] Reactive liquid plastics for building waterproofing, especially for sealing flat roofs, balconies, and terraces, are well-known. These are typically based on unsaturated polyesters, polyurethanes, or acrylate copolymers. Suitable polymeric waterproofing materials are specified in more detail in the EOTA guideline ETAG No. 005 (Guideline for European Technical Approval for liquid-applied roof waterproofing systems): Firstly, the materials must be sufficiently elastic over time, i.e., even after aging, to absorb the stresses caused by temperature fluctuations; secondly, the coatings must be mechanically resistant to prevent leaks due to punctures, e.g., from high-pressure point loads or falling objects.Furthermore, reactive liquid plastics must exhibit good adhesion to all common substrates in roofing applications, such as metals, masonry and concrete, bituminous roofing membranes, or polymeric waterproofing membranes based on various polymer materials. The bond between waterproofing membranes and reactive liquid plastic is fundamentally a key weak point in the waterproofing system. Therefore, there is a significant need for reactive liquid plastics with improved adhesion properties.

[0005] Among polymer waterproofing membranes, those based on polyolefins are gaining increasing importance due to their particularly good price-performance ratio. These membranes are typically reinforced plastic sheets based on polyethylene, polypropylene, and / or polybutylene copolymers. Such plastic sheets are commonly referred to as FPO (flexible polyolefin) or TPO (thermoplastic polyolefin) membranes. A major disadvantage of polyolefin waterproofing membranes is their poor adhesion to reactive liquid plastics. Therefore, pretreatment with an adhesion primer or undercoat is essential to create a strong bond between polyolefin sheets and reactive liquid plastics. However, even in combination with commercially available adhesion primers, the adhesion is often insufficient.

[0006] As reactive liquid plastics, one-component and two-component sealing compounds based on silane-terminated polymers can be used particularly advantageously in building waterproofing. Such products are characterized by ease of application, good mechanical properties, and toxicological safety. Materials based on this technology and their use as sealing materials for roof coatings are known, for example, from EP-A 1 987 108, EP-A 2 352 776, EP-A 2 561 024, DE 10 2007 038 030 A1, and WO 2019 114990 A1. With regard to adhesion to polymeric waterproofing membranes, there is a particular need for improvement in this product group.

[0007] Furthermore, WO 2019057670A1, WO2018015552A1, WO 2007 / 093382A1 and EP1650261A1 should be mentioned as technological background from the state of the art.

[0008] The object of the present invention is to provide improved sealing materials based on silane-terminated polymers which exhibit improved adhesion to commercially available sealing membranes.

[0009] This task is solved by a 2-component coating composition for building sealing with a catalyst-cocatalyst system according to the requirements.

[0010] The invention comprises a 2-component coating composition for building waterproofing with a catalyst-cocatalyst system comprising a component A and a component B, wherein component A comprises at least: A1) a polymeric compound of the formula Y-[(CH₂)b-Si-R1a-R2(3a)]x, where Y is an x-valent polyether residue, optionally containing urethane groups, linked via a urethane group, a thiourethane group, or an optionally substituted urea group, and R1 is a methyl group, R2 is a methoxy or ethoxy group, and a is equal to 0 or 1, and b is equal to 1 or 3; A2) inorganic fillers; A3) aminosilane compounds, with at least one primary and / or secondary amino group; A4) compounds of the structural formula Rx-Si(OCH₃)₃, where Rx is a vinyl or phenyl group; A5) antioxidants; and where component B includes at least: B1) an organic acid or its acidic salts

[0011] The invention is based on the surprising observation that the 2-component sealing compounds according to the invention, based on silane-terminated polymers, exhibit improved adhesion to commercially available sealing membranes compared to the analogous 1-component sealing compounds.

[0012] Two-component sealants based on silane-terminated polymers have been known for a long time and are state of the art: for example, EP 2894199 A1, EP 2682432 A1 or EP 1650261 A1 describe sealants based on silane-terminated polyethers, which can be formulated as one- or two-component systems: in the case of a two-component formulation, the first component contains the silane-terminated polymer, additives and fillers, the second component contains catalysts known per se for the silane polycondensation, plasticizers, water and filler.

[0013] These publications identify prior art catalysts that accelerate silane polycondensation. These include organometallic catalysts such as organotin, titanium, or zirconium compounds; organic amine catalysts with primary, secondary, and / or tertiary nitrogen atoms; amidine and guanidine catalysts; various metal salts of carboxylic acids; carboxylic acids; and phosphoric acid esters. Furthermore, EP 1650261 A1 indicates that the combination of amine catalysts and carboxylic acids or phosphoric acid esters exhibits increased catalytic activity.

[0014] Two-component sealing compounds are also described in EP 2220163 B1: here the first component contains special silane-terminated polyurethane polymers, additives, fillers and the curing catalyst, and the second component contains plasticizers, water and surfactants.

[0015] Particularly reactive one-component formulations are described in the more recent WO 2019 114990 A1. This document also mentions the possibility of formulating two-component systems, where the second component consists of water or other OH-containing compounds.

[0016] None of the publications mentioned contain any indications of altered or even improved adhesion properties of 2-component formulations through the use of specific catalyst-cocatalyst systems.

[0017] Polymeric compounds that can be used as components A1) within the scope of the invention have the general structural formula Y-[(CH 2 ) b -Si-R1 a -R2 (3-a) ] x , wherein Y is an x-valent polyether residue, optionally having urethane groups, which is linked via a urethane group, a thiourethane group or via an optionally substituted urea group and R1 is a methyl group and R2 is a methoxy or ethoxy group and a is equal to 0 or 1 and b is equal to 1 or 3.

[0018] Such polymeric compounds A1) can in principle be produced by two different synthesis concepts: Within the scope of the invention, the following can be used as component A1 are, on the one hand, reaction products of polyoxyalkylene polyols, preferably polyoxypropylene polyols, particularly preferably polyoxypropylene diols of an average molecular weight Mn of 2000 to 30000 g / mol, preferably 4000 to 20000 g / mol with isocyanatosilanes of the general formula O=C=N-(CH 2 ) b -Si-R1 a -R2 (3-a) where R1 stands for a methyl group and R2 for a methoxy or an ethoxy group and a = 0 or 1 and b = 1 or 3.

[0019] Polyoxyalkylene polyols containing urethane groups can also be used as polyoxyalkylene polyols; these can be produced by reacting polyoxyalkylene polyols with insufficient amounts of diisocyanates and correspond to the information given above.

[0020] Preferably, a = 0, b = 1 and R2 represents an ethoxy group. Also preferred is a = 0, b = 3 and R2 represents a methoxy group; particularly preferred is a = 1, b = 1 and R1 represents a methyl group and R2 a methoxy group. Such silane-terminated polymers A1 are particularly preferred. They are characterized by a particularly high reactivity towards moisture and can be rapidly cured with atmospheric moisture using very small amounts of the catalysts mentioned below as examples or combinations thereof.

[0021] On the other hand, within the framework of component A1, reaction products of polyoxyalkylene polymers having isocyanate end groups with isocyanate-reactive alkoxysilyl compounds of the general formula Z-(CH 2 ) b -Si-R1 a -R2 (3-a) can be used.

[0022] The isocyanate-end-group polyoxyalkylene polymers are prepared by reacting polyoxyalkylene polyols with excess amounts of diisocyanates and correspond to the molecular weights given above. In a second reaction step, these isocyanate-end-group polyoxyalkylene polymers are reacted with alkoxysilyl compounds containing a functional group reactive with isocyanate groups and corresponding to the general formula given above. Here, a, b, R1, and R2 correspond to the values ​​given above, Z represents an OH group, an SH group, an NH₂ group, or an NHR₃ group, and R₃ represents any organic residue with up to 16 carbon atoms.Suitable for reaction with polyoxyalkylene polymers containing isocyanate end groups are, for example, aminosilane compounds with primary or secondary amino groups such as 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N-methyl-3-aminopropyltrimethoxysilane, N-cyclohexyl-3-aminopropyltrimethoxysilane, N-butyl-3-aminopropyltrimethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, N-cyclohexyl-3-aminopropyl-methyldimethoxysilane, as well as adducts of maleic and / or fumaric acid esters to aminopropyltrimethoxysilane or aminopropyltriethoxysilane. Mercapto-functional alkoxysilane compounds such as mercaptopropyltrimethoxysilane or mercaptopropyltriethoxysilane are also suitable for reaction with polyoxyalkylene polymers containing isocyanate end groups.OH-functional alkoxysilane compounds are also suitable for reaction with polyoxyalkylene polymers having isocyanate end groups; these can be easily produced, for example, by reacting the above-mentioned aminosilane compounds with caprolactone.

[0023] In the context of the invention, inorganic fillers of the prior art can be used as component A2. Examples of fillers A2 are non-reinforcing fillers, i.e., fillers with a BET surface area of ​​preferably up to 50 m² / g, such as quartz, diatomaceous earth, calcium silicate, zirconium silicate, talc, kaolin, zeolites, metal oxide powders such as aluminum, magnesium, titanium, iron, or zinc oxides or their mixed oxides, barium sulfate, calcium carbonate, mixed crystals of kaolin and quartz, or also reinforcing fillers, i.e., fillers with a BET surface area of ​​more than 50 m² / g, such as pyrogenically produced silica, precipitated silica, precipitated chalk, carbon black such as furnace and acetylene carbon black and silicon-aluminum mixed oxides with a large BET surface area, or aluminum trihydroxide. The fillers mentioned can be made hydrophobic, for example by treatment with organosilanes or organosilanes or with fatty acids, or by etherification of hydroxyl groups to alkoxy groups.

[0024] The fillers A2 used according to the invention are preferably calcium carbonate, talc, aluminum hydroxide, silica, and / or titanium dioxide in the rutile form, with the use of aluminum hydroxide being particularly preferred because this filler also has a flame-retardant effect. Preferred calcium carbonate types are ground or precipitated and optionally surface-treated with fatty acids such as stearic acid or its salts. The preferred silica is preferably pyrogenic silica.

[0025] The fillers A2 used typically have a moisture content of less than 1 wt.% based on the weight of the filler, preferably less than 0.5 wt.%.

[0026] Organic or inorganic fibers, such as glass fibers, carbon fibers or plastic fibers, such as polyester, polyamide, aramid or polyacrylate fibers, as well as metal fibers or fibers with metallic components, can still be used in subordinate quantities as fillers A2.

[0027] Compounds with at least one primary and / or secondary amino group can be used as component A3 according to the invention. Examples include amine compounds with primary and / or secondary amine groups such as alkylamines with 1 to 20 carbon atoms, cyclohexylamine, benzylamine, aliphatic or cycloaliphatic secondary amines, such as dialkylamines with 2 to 36 carbon atoms or alkyl-cyclohexylamines or dicyclohexylamine, morpholine, piperidine, alkanolamines such as ethanolamine or diethanolamine, diamines such as diaminoethane, diaminopropane or diaminobutane, piperazine, polyethylene polyamines such as diethylenetriamine or triethylenetetramine, xylylenediamine, aminoalkylamines such as aminopropylmorpholine, aminoethylpiperazine, and N,N-dialkylpropylamines such as N,N-diethyl-1,3-diaminopropane.

[0028] Compounds that form compounds with primary and / or secondary amine groups through hydrolysis, such as compounds with at least one ketimine, aldimine or oxazolidine group, can also be used within component A3.

[0029] Within the scope of the invention, it has been shown that such amines exhibit a particularly high catalytic activity in the 2-component coating compositions according to the invention.

[0030] Particularly preferred for use in component A3 are compounds which, in addition to a primary and / or secondary amino group, also have at least one alkoxysilyl group. According to the invention, aminosilane compounds known per se of the general structural formula NHR4-(CH2)b-SiR1a-R2 (3-a) can be used, wherein R1, R2, a, and b have the meanings mentioned above and R4 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, or an aminoalkyl group; a is preferably 0, and R2 particularly preferably represents a methoxy group, and b particularly preferably represents 3. Oligomeric products, such as those that can be prepared by condensation of the aforementioned aminosilane compounds, are also suitable in this context.

[0031] Examples of aminosilane compounds preferably used as component A3 are 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N-aminoethyl-3-aminopropyltrimethoxysilane, N-aminoethyl-3-aminopropyltriethoxysilane, N-aminoethyl-3-aminopropylmethyldimethoxysilane, N-methyl-3-aminopropyltrimethoxysilane, N-cyclohexyl-3-aminopropyltrimethoxysilane, N-butyl-3-aminopropyltrimethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, N-cyclohexyl-3-aminopropylmethyldimethoxysilane, and oligomerization products of these aminosilane compounds. Particularly preferred aminosilane compounds contain at least one primary amino group and methoxysilyl groups. Examples of particularly preferred aminosilane compounds are 3-aminopropyltrimethoxysilane, N-aminoethyl-3-aminopropyltrimethoxysilane, N-aminoethyl-3-aminopropyl-methyldimethoxysilane.

[0032] The aminosilane compounds in component A3 act simultaneously as a curing catalyst and an adhesion promoter within component A. A significant advantage is that these aminosilane compounds are incorporated into the polymer backbone during curing, preventing any harmful catalyst residues from escaping the product into the environment. Naturally, mixtures of these amino compounds can also be used in component A3.

[0033] Within the scope of the invention, compounds of the general structural formula Rx-Si(OCH3)3, wherein Rx is a vinyl or phenyl group or an oligomerization product derived from these compounds, can be used as component A4. These compounds exhibit particularly high reactivity towards moisture and are therefore used for drying the inorganic filler components A2 during the manufacturing process and for improving the storage stability of component A. Vinyltrimethoxysilane is preferably used as component A4.

[0034] Within the scope of the invention, known plastic stabilizers from the prior art are used as component A5. These are, in particular, antioxidants, UV absorbers, and radical scavengers of the hindered amine light stabilizer (HALS) type. Combinations of the aforementioned stabilizer types are preferably used. Higher molecular weight, oligomeric, or polymeric stabilizers of the aforementioned types are particularly preferred as anti-aging agents, and such higher molecular weight stabilizers can also combine several stabilizer types. A summary of the topic of anti-aging agents can be found in WO 2019 114990 A1, which is fully incorporated into the subject matter of the present invention.

[0035] Examples of antioxidants include sterically hindered phenols, whose structure is derived from 2,6-di-tert-butyl-4-methylphenol. Examples of corresponding commercial products are Irganox 1135, Irganox 1076, Irganox 1010, Irganox 1098, Irganox 5057, Hostanox O3, Sumilizer GA80, and Irganox 3790.

[0036] Examples of UV absorbers include benzotriazole-type and triazine-type compounds. Examples of corresponding commercial products are Tinuvin P, Tinuvin 213, Tinuvin 326, Tinuvin 327, Tinuvin 328, Tinuvin 329, Tinuvin 571, Milestab 1174, and Milestab 1577.

[0037] Hindered amine light stabilizers (HALS) are compounds whose basic structure is derived from 2,2,6,6-tetramethylpiperidine. Examples of corresponding commercial products are Tinuvin 770, Tinuvin 123, Tinuvin 765, Tinuvin 622, Tinuvin 144, Cyasorb UV3853, Cyasorb UV3622, Milestab 4050, Hostavin N30, Chimasorb 944, and Chimasorb 119.

[0038] According to a preferred aspect, the two-component coating composition additionally comprises formulation aids as component A6. Component A6 can include, among other things, auxiliaries and additives known to those skilled in the art from coating technology. These are, on the one hand, formulation aids such as deaerators, defoamers, wetting and dispersing additives, and rheology aids; on the other hand, adhesion promoters, in particular those from the group of functional silanes, such as epoxysilanes, carbamatosilanes, isocyanuratosilanes, acryloxysilanes, or methancryloxysilanes.

[0039] According to a further preferred aspect, component A comprises, as formulation aid A6, an organic solvent with a proportion of at most 5 wt%, preferably with a proportion of at most 3 wt% based on the total weight of components A and B. Organic solvents according to the invention can be, for example, ethyl acetate, butyl acetate, methoxypropyl acetate, methyl ethyl ketone, methyl isobutyl ketone, toluene, xylene, aromatic or (cyclo-)aliphatic hydrocarbon mixtures, or any mixtures of such solvents.

[0040] According to a particularly preferred aspect, component A comprises, as formulation aid A6, a plasticizer with a proportion of at most 5 wt%, preferably at most 3 wt%, based on the total weight of components A and B. Plasticizers according to the invention can be selected from the group consisting of phosphoric acid esters, sulfonic acid esters, or aromatic and / or aliphatic carboxylic acid esters. High-boiling aliphatic and / or aromatic hydrocarbon mixtures can also be used. The use of such plasticizers is less preferred, as their use negatively affects the long-term stability of the building waterproofing. Polyether polyols, in particular polypropylene oxide polyethers with a molecular weight of preferably 1000 to 12000 g / mol, can also be used as plasticizers within component A6.Within the scope of the present invention, it has been shown that the use of such plasticizers in quantities of a maximum of 5 wt%, preferably a maximum of 3 wt%, based on the total weight of components A and B does not negatively affect the mechanical behavior and the aging behavior.

[0041] According to one advantageous aspect, component A comprises a reactive diluent as formulation aid A6. Within the framework of formulation aids A6, reactive diluents may also be used in accordance with the teaching of WO 2019 114990 A1; examples of suitable reactive diluents are in particular n-alkyltrialkoxysilyl compounds whose alkyl group has at least 8 carbon atoms, such as isooctyltrimethoxysilane, isooctyltriethoxysilane, n-octyltrimethoxysilane, n-octyltriethoxysilane, n-decyltrimethoxysilane, n-decyltriethoxysilane, n-dodecyltrimethoxysilane, n-dodecyltriethoxysilane, n-tetradecyltrimethoxysilane, n-tetradecyltriethoxysilane, n-hexadecyltrimethoxysilane, n-hexadecyltriethoxysilane and n-octadecyltriethoxysilane. The use of such silanes reduces the water absorption of the cured coatings, which has a positive effect on long-term stability.The co-use of compounds with the general structural formula Ry-Si(OCH3)3 in amounts of up to 25 wt% based on the total weight of component A is preferred, where Ry represents an alkyl group with at least 10 carbon atoms. According to an advantageous aspect, component A comprises a liquid silicone resin as formulation aid A6. Liquid silicone resins according to WO 2019 114990 A1 can be used as part of formulation aid A6. Preferably, the silicone resins have a mean molar mass (number average) Mn of approximately 600 g / mol to approximately 3000 g / mol, are solvent-free, and have a viscosity of no more than 20,000 mPas at 23°C.

[0042] Additional catalysts that accelerate silane polycondensation can optionally be used within component A6. These can be any known catalysts for silane polycondensation-curing materials, which can also be used in the mixture.

[0043] Examples of metal-containing hardening catalysts include organotin compounds such as dibutyltin dilaurate, dibutyltin maleate, dibutyltin diacetate, dibutyltin dioctanoate, dibutyltin acetylacetonate, dibutyltin oxides, and corresponding dioctyltin compounds. Further examples of metal-containing hardening catalysts are organotitanium compounds, especially esters of titanic acid such as tetrabutyl titanate, tetrapropyl titanate, tetraisopropyl titanate, and titanium tetraacetylacetonate. Examples of amidine catalysts B4 include, in particular, cyclic amidines such as 5-diazabicyclo[4.3.0]non-5-ene,1 or 8-diazabicyclo[5.4.0]undec-7-ene. Generally, all N-alkyl or N-aryl-substituted catalysts with a guanidine structure are suitable as guanidine catalysts. Examples include tetramethylguanidine, N,N'-diphenylguanidine, N,N'-di-o-tolylguanidine or 1-o-tolylbiguanide.Other examples of suitable catalysts are tertiary amines such as triethylamine, tributylamine, N,N-dimethylethanolamine, aminoethylpiperazine, 1,4-diazabicyclo[2,2,2]octane, N-bis-(N,N-dimethyl-2-aminoethyl)methylamine, N,N-dimethylcyclohexylamine, N,N'-dimethylpiperazine, bis-2-dimethylaminoethyl ether, and N-alkylmorpholines such as N-ethylmorpholine or dimorpholine diethyl ether.

[0044] Particularly preferred is the use of no catalysts that accelerate silane polycondensation in component A6.

[0045] Component A is produced in a manner known to those skilled in the art using suitable mixing units according to methods and procedures commonly used for the production of moisture-curing compositions by adding the individual components of component A in any order and mixing.

[0046] This mixing can take place at room temperature under normal pressure or at elevated temperatures up to 120°C. Furthermore, it can be advantageous to mix temporarily or continuously under reduced pressure, such as 30 to 500 hPa absolute pressure, to remove volatile compounds and / or air. The production of component A can be carried out using both batch and continuous processes. Premixes of individual components can also be prepared and then mixed together to produce component A.

[0047] Typically, component A contains the following proportions based on the total weight of component A: 30 to 65 wt%, preferably 40 to 55 wt% of polymeric compound A1; 25 to 55 wt%, preferably 30 to 45 wt% of inorganic fillers A2; 0.2 to 2.5 wt%, preferably 0.5 to 2 wt% of compounds A3 containing amino and alkoxysilyl groups; 1 to 6 wt%, preferably 1.5 to 5 wt% of vinyl and / or phenyltrimethoxysilyl compounds A4; 1.5 to 7.5 wt%, preferably 2.5 to 5 wt% of anti-aging agents A5; 0 to 25 wt%, preferably 1 to 15 wt% of auxiliary and additive agents A6, provided that organic solvents and / or plasticizers are used in amounts of a maximum of 5 wt%, preferably a maximum of 3 wt%, based on the total weight of component A.

[0048] Component A therefore contains all the essential components of a 1-component coating composition and can be used without problems as a moisture-curing sealing system in accordance with the EOTA guideline ETAG 005.

[0049] Component B includes at least: B1) an organic acid or its acidic salts

[0050] Component B consists primarily of organic acids B1, which, in combination with the amines of group A3, particularly with the aminosilane compounds of group A3, act cocatalytically. It is essential to the invention that in the two-component coating compositions according to the invention, component A contains a catalyst for silane polycondensation with the catalytically active amine compounds A3, and component B contains a cocatalyst that is not effective on its own, but only accelerates the silane polycondensation in combination with the catalyst A3 of component A. Within the scope of the present invention, it has been shown that such two-component coating compositions are exceptionally tolerant of mixing errors.Furthermore, within the scope of the present invention, it has been shown that the two-component sealing compounds according to the invention exhibit significantly better adhesion to various commercially available sealing membranes compared to the underlying one-component sealing compounds without a cocatalyst. Suitable acidic organic compounds B1 are, for example, carboxylic acids, dicarboxylic acids, or tricarboxylic acids with 1 to 24 carbon atoms. Examples of suitable carboxylic acids within component B1 are formic acid, acetic acid, propionic acid, caproic acid, 2-ethylhexanoic acid, decanoic acid, neodecanoic acid, dodecanoic acid, tetradecanoic acid, hexadecanoic acid, or octadecanoic acid. Unsaturated carboxylic acids such as undecylenic acid, oleic acid, or linoleic acid are also suitable within component B1.Also suitable within component B1 are polyhydric saturated and unsaturated carboxylic acids such as oxalic acid, malonic acid, adipic acid, sebacic acid, maleic acid, fumaric acid, tartaric acid, malic acid, or cyclohexanedicarboxylic acid. Aromatic carboxylic acids such as benzenecarboxylic acid, salicylic acid, the isomeric benzene-dicarboxylic acids, and benzene-tricarboxylic acids are also suitable within component B1. Acidic salts of such carboxylic acids can also be used in principle within component B1. Acidic derivatives of organic phosphoric acid esters, especially mono- and diesters of phosphoric acid, are also suitable within component B1. Examples include ethyl phosphate, diethyl phosphate, butyl phosphate, dibutyl phosphate, 2-ethylhexyl phosphate, or bis-2-ethylhexyl phosphate.

[0051] Carboxylic acids and dicarboxylic acids with 6 to 18 carbon atoms, particularly preferably 8 to 16 carbon atoms, are preferably used in component B.

[0052] According to one advantageous aspect, component B1 comprises an aliphatic carboxylic acid or dicarboxylic acid.

[0053] According to another advantageous aspect, component B1 comprises an aliphatic monocarboxylic acid with 1 to 16 carbon atoms.

[0054] According to one particularly advantageous aspect, component B additionally comprises at least one monohydric or polyhydric alcohol.

[0055] According to a preferred aspect, component B comprises water as component B2. The amount of water can be chosen such that it is stoichiometrically sufficient for quantitative silane polycondensation.

[0056] According to a particularly preferred aspect, the two-component coating composition comprises water as component B2 in a proportion ranging from 0.05 wt% to 0.9 wt%, preferably 0.1 wt% to 0.5 wt%, based on the total weight of component A. It is particularly preferred that component B be used as a homogeneous solution. In the case of water-insoluble acids, it is necessary that component B additionally contains a solubilizer for the catalysts B1 and the water. This can be small amounts of polar protic or polar aprotic solvents of the known type. Low-molecular-weight or high-molecular-weight, monohydric or polyhydric alcohols are advantageously used in this context. Ethoxylated and / or propoxylated alcohols with a molecular weight of up to 2000 g / mol are particularly preferred as solvents.The solvents are used in an amount of less than 5 wt%, preferably less than 2 wt%, based on the total weight of components A and B, in order to avoid adverse effects on the mechanical properties and aging behavior.

[0057] In the two-component sealing compound according to the invention, components A and B are mixed immediately before application. Mixing can be carried out by simply stirring components A and B by hand under construction site conditions. It is particularly advantageous to add a small amount of component B to component A and homogenize the mixture by simply stirring. Components A and B are particularly advantageously packaged in container sizes corresponding to the specified mixing ratios. The two-component sealing compound according to the invention has a comparatively long working time of up to 15 to 30 minutes, but on the other hand, it cures reliably within a short time of approximately 60 to 120 minutes in any layer thickness.

[0058] The present invention also relates to a method for waterproofing structures, comprising the process step of applying a two-component coating composition according to one of the preceding claims in combination with a textile. This allows a fabric-reinforced coating to be achieved. The two-component waterproofing compounds to be used in the method according to the invention are generally applied in combination with a textile fabric when waterproofing structures. This term encompasses all knitted, crocheted, woven, braided, or otherwise fabricated textiles made from yarns or fibers. Suitable textile fabrics are based on organic or inorganic fibers, such as glass fibers, carbon fibers, or plastic fibers, such as polyester, polyamide, aramid, or polyacrylate fibers, metal fibers, or fibers with metallic components, or the like.Preferably, nonwoven materials such as glass fiber or polyester nonwovens are used. Preferably, the sheet materials, particularly in the form of polyester nonwovens, with a basis weight of 50 to 300 g / m² or 75 to 250 g / m², and especially preferably 110 to 165 g / m², are used in the inventive process. This provides exceptional reinforcement for many applications while simultaneously resulting in a very low tendency to run off.

[0059] According to one preferred aspect, the method for building sealing is used to form expansion and / or working and / or controlled crack joints in concrete construction, especially in constructions with precast concrete components.

[0060] The two-component sealing compounds used in the inventive method are preferably mixed immediately before application and cure within only 60 minutes at ambient temperatures typical in the construction industry, in particular around 23°C. In the preferred case that component B contains water, curing occurs within this time even in thick layers of up to 10 mm. Application typically involves first coating the part of the structure to be sealed with the premixed two-component coating system, for example by brushing, rolling, or squeegeeing. Then, the textile surface, such as a nonwoven fabric, is embedded in the applied sealing system, and finally, the surface is brought into close contact with the sealing system, for example by brushing, rolling, or squeegeeing.The surface is preferably treated so that it is completely saturated with the reactive sealing system, and preferably, a homogeneous surface structure is achieved. If necessary, another coat of coating can be applied to create a more uniform surface.

[0061] The application is usually carried out such that approximately 2-10 kg, preferably 2-5 kg, and particularly preferably 2.5 kg to 3.5 kg of sealing system are applied per square meter of surface to be coated. The application is usually carried out in such a way that, in combination with the textile surface structure, such as nonwoven fabric, a coating thickness of at least 2 mm, typically 2 to 5 mm, or preferably 2.2 mm to 3.5 mm (based on the total layer thickness) results.

[0062] The sealing system used according to the invention exhibits excellent adhesion to many substrates commonly used in the construction industry, in particular to concrete and masonry as well as polymer- or bitumen-based roofing membranes, and to itself. Priming the substrate before applying the reactive system used in the method according to the invention is often unnecessary. Nevertheless, applying a primer can be advantageous in specific cases. It has been shown that the two-component coating systems used according to the invention exhibit excellent compatibility with virtually all primers and undercoats available on the market.

[0063] In combination with polymer waterproofing membranes, especially polyolefin-based membranes, pretreatment with a primer or bonding agent is generally required. Solutions of chlorinated and / or modified chlorinated polyolefins are particularly suitable for this purpose. These chlorinated and / or modified chlorinated polyolefins typically have a chlorine content of 10 to 25% by weight, based on the solids content of the chlorinated polyolefins. The chlorinated or modified chlorinated polyolefins used typically have a number-average molecular weight of 8,000 to 50,000. The amount of chlorinated polyolefin used in the primer formulation is typically 0.2 to 5% by weight, based on both the total weight of the primer and the solids content of the chlorinated polyolefins. Such primer formulations are familiar to those skilled in the art and are commercially available.

[0064] As already explained above, the sealing system to be used in the method according to the invention also exhibits good adhesion to itself. Therefore, it is possible to apply several layers of the sealing compound used according to the invention one on top of the other, whereby the previously applied sealing compound can already have hardened between the various application processes.

[0065] The method according to the invention thus enables reliable sealing of structures in interior and exterior areas, for example, in combination with tile and slab coverings for sealing interiors against non-pressurized water, as well as of containers against pressurized water from the inside, both indoors and outdoors. Such methods are regulated nationally according to the German Building Regulations List A, Part 2, Item No. 2.50, and internationally according to ETAG 022 "Waterproofing for floors and walls in wet rooms". The method according to the invention is particularly suitable for sealing against pressurized and non-pressurized water in foundations, terraces, balconies, flat roofs, parking decks, underground garages, and / or concrete bases, in essentially horizontal building surfaces such as terraces and flat roofs, especially in the area of ​​upstands. The method according to the invention thus fully covers the areas of building waterproofing according to DIN 18195 and roof waterproofing according to DIN 18531.

[0066] The following examples are intended to further illustrate the nature of the invention, but not to limit it. Patent examples General manufacturing instructions for component A

[0067] Components A1 and A4 are placed in a standard circular dissolver at normal pressure and ambient temperature. The components of component A2 are added in any order while stirring. The mixture is then dispersed at an increased rate, during which time it heats up to 50–55°C due to shear forces. Dispersal continues for 20 minutes in the absence of air and moisture. Components A3, A5, and A6 are then added at a low stirring rate. The mixture is filled into containers under the absence of moisture.

[0068] Component Ai: Component A1: 45 parts by weight Geniosil STPE 10, silane-terminated polypropylene glycol with an average molar mass (Mn) of 12,000 g / mol and end groups of the formula -OC=O-NH-CH₂-SiCH₃(OCH₃)₂ (commercial product of Wacker Chemie AG) Component A2: 19 parts by weight Martinal ON313S, aluminum hydroxide from Huber-Martinswerk GmbH, Bergheim, 18 parts by weight Omyacarb 2T-AV, ground chalk from Omya GmbH, Cologne, 3 parts by weight Kronos 2310, titanium dioxide white pigment from Kronos Europe. SA, 1.5 parts by weight Aerosil R972, pyrogenic silica from Evonik Industries AG, Essen, 0.5 parts by weight Bayferrox 306, iron oxide black pigment from Lanxess Deutschland GmbH, Cologne. Component A3: 1 part by weight Geniosil GF 96, 3-aminopropyltrimethoxysilane, commercial product from Wacker Chemie AG, Burghausen. Component A4: 2.5 parts by weight Geniosil XL10, vinyltrimethoxysilane, commercial product from Wacker Chemie AG, Burghausen. Component A5: 1.5 parts by weight Irganox 1010, phenolic antioxidant from [Company Name Missing].BASF SE, Ludwigshafen, 1 part by weight Tinuvin 384-2, benzotriazole UV absorber from BASF SE, Ludwigshafen, 3 parts by weight Tinuvin 123, HALS light stabilizer from BASF SE, Ludwigshafen. Component A6: 8 parts by weight hexadecyltrimethoxysilane, Dynasylan 9116, commercial product of Evonik Industries AG, Essen.

[0069] The mixture has a rotationally viscometrically determined viscosity of 12500 mPas at 23°C.

[0070] Component Aii: Component A1: 35 parts by weight of silane-terminated polypropylene glycol polyurethane prepolymer with an average molar mass (Mn) of approximately 12,000 g / mol and end groups of the formula -NC=O-NR-(CH₂)₃-Si(OCH₃)₃ (R=C₈H₁₁O₄, produced according to WO 0026271A1, Example 1) Component A2: 21 parts by weight of Martinal OL 104 LEO, aluminum hydroxide from Huber-Martinswerk GmbH, Bergheim, Germany; 10 parts by weight of Omyacarb 2T-AV, ground chalk from Omya GmbH, Cologne, Germany; 7 parts by weight of Omyalite 95T, ground chalk from Omya GmbH, Cologne, Germany; 2 parts by weight of precipitating chalk, Hakuenka CCR-S from Shiraishi-Omya GmbH, Gummern, Austria. Component A3: 0.5 parts by weight Kronos 2310, titanium dioxide white pigment from Kronos Europe SA, 0.5 parts by weight Bayferrox 306, iron oxide black pigment from Lanxess Deutschland GmbH, Cologne. Component A3: 1.5 parts by weight Dynasylan DAMO, N-aminoethyl-3-aminopropyltrimethoxysilane, commercial product of [Company Name Missing].Evonik Industries AG Essen, 1.5 parts by weight dibutylamine. Component A4: 3.5 parts by weight Geniosil XL70, phenyltrimethoxysilane, commercial product of Wacker Chemie AG, Burghausen. Component A5: 0.5 parts by weight Irganox 1076, phenolic antioxidant of BASF SE, Ludwigshafen; 1 part by weight Tinuvin 384-2, benzotriazole UV absorber of BASF SE, Ludwigshafen; 1.5 parts by weight Chimasorb 119, polymeric HALS light stabilizer of BASF SE, Ludwigshafen. Component A6: 6 parts by weight octyltrimethoxysilane, Dynasylan OCTMO, commercial product of Evonik Industries AG, Essen. 2 parts by weight of plasticizer cyclohexanedicarboxylic acid diisononyl ester, Hexamoll DINCH from BASF SE, Ludwigshafen.

[0071] The mixture has a rotationally viscometrically determined viscosity of 17200 mPas at 23°C.

[0072] Component Aiii: Component A1: 45 parts by weight Geniosil STPE 15, silane-terminated polypropylene glycol with an average molar mass (Mn) of 12,000 g / mol and end groups of the formula -O-CO-NH-(CH₂)₃-Si(OCH₃)₃ (commercial product of Wacker Chemie AG) Component A2: 19 parts by weight Martinal ON313S, aluminum hydroxide from Huber-Martinswerk GmbH, Bergheim, 19 parts by weight Omyacarb 2T-AV, ground chalk from Omya GmbH, Cologne, 3 parts by weight Kronos 2310, titanium dioxide white pigment from Kronos Europe. SA, 1.5 parts by weight Aerosil R972, pyrogenic silica from Evonik Industries AG, Essen, 0.5 parts by weight Bayferrox 306, iron oxide black pigment from Lanxess Deutschland GmbH, Cologne. Component A3: 1.5 parts by weight Geniosil GF 96, 3-aminopropyltrimethoxysilane, commercial product from Wacker Chemie AG, Burghausen, 1.5 parts by weight N,N-diethyl-1,3-propanediamine. Component A4: 2.5 parts by weight Geniosil XL10, vinyltrimethoxysilane, commercial product from [Company Name Missing].Wacker Chemie AG, Burghausen Component A5: 1.5 parts by weight Irganox 1010, phenolic antioxidant from BASF SE, Ludwigshafen, 1 part by weight Tinuvin 384-2, benzotriazole UV absorber from BASF SE, Ludwigshafen, 2 parts by weight Tinuvin 123, HALS light stabilizer from BASF SE, Ludwigshafen Component A6: 5 parts by weight Hexadecyltrimethoxysilane, Dynasylan 9116, commercial product from Evonik Industries AG, Essen, 3 parts by weight plasticizer Acclaim 2200, polypropylene glycol from Covestro AG, Leverkusen.

[0073] The mixture has a rotationally viscometrically determined viscosity of 14500 mPas at 23°C. General manufacturing instructions for component B

[0074] All components are stirred in a standard stirring apparatus until a homogeneous solution is obtained.

[0075] Component Bi: 60 parts by weight polypropylene glycol, average molecular weight = 800 g / mol; 10 parts by weight neodecanoic acid; 30 parts by weight water

[0076] Component Bii: 58 parts by weight polypropylene glycol, average molecular weight = 400 g / mol; 12 parts by weight propionic acid; 30 parts by weight water

[0077] Component Biii: 61 parts by weight polypropylene glycol, average molecular weight = 800 g / mol; 9 parts by weight 2-ethylhexanoic acid; 30 parts by weight water

[0078] Component Biv: 50 parts by weight polypropylene glycol, average molecular weight = 1000 g / mol; 20 parts by weight dibutyl phosphoric acid ester; 30 parts by weight water Curing and adhesion testing on commercially available waterproofing membranes Examples of inventive inventions:

[0079] 300 g of component A are mixed with 3 g of component B by intensive stirring. Immediately after mixing, the system is applied as described below. All samples are fully cured after a time of 60 to 120 minutes. Non-inventive comparative examples

[0080] Component A is used – without the addition of component B – as a moisture-curing, one-component sealant. Skin formation takes 30 to 90 minutes, and the samples take approximately 3 days to fully cure. Liability review

[0081] The liquid 1- and 2-component waterproofing compounds are applied to sample pieces of commercially available waterproofing membranes in a quantity corresponding to 1.7 kg / m². A polyester fleece with a basis weight of 110 g / m² (Frankolon fleece, from Franken-Systems Gollhofen) is embedded in the reacting compound and carefully pressed down so that the underside is evenly coated with the reacting compound. An uncoated fleece overhang of approximately 5 cm is left on one side of the sample area. The top side of the polyester fleece is then coated again with the same quantity of the liquid 1- and 2-component waterproofing compounds, so that the fleece is completely coated except for the uncoated fleece overhang. The total quantity of waterproofing compound corresponds to 3.4 kg / m². The average layer thickness of the fleece-reinforced seal produced in this way is 2.2 + / - 0.1 mm. Assessment of liability:

[0082] The sealant is cured for 7 days at 23°C and 50% relative humidity. Adhesion is then checked using a manual peel test. In this test, the fleece overhang is pulled parallel to the surface of the coated membrane, and the peel resistance is assessed on a scale of 1 to 4 as follows: 1. The sealing material can be removed from the waterproofing membrane without residue using light force. 2. The sealing material can be removed from the waterproofing membrane with moderate force, leaving small residues of sealing material on the membrane. 3. The sealing material can only be removed from the waterproofing membrane with great force, leaving larger residues of sealing material on the membrane. 4. The sealing material can be removed from the waterproofing membrane by destroying the fleece reinforcement. Commercially available sealing membranes used

[0083] Layer A: Bauder Thermoplan T15, polyolefin membrane from Paul Bauder GmbH & Co KG, Stuttgart, primed with Liquitec Primer Plastic from Paul Bauder GmbH & Co KG, Stuttgart, Germany. Layer B: Bauder Thermofin F15V, polyolefin membrane from Paul Bauder GmbH & Co KG, Stuttgart, primed with Frankolan FPO Primer from Franken-Systems GmbH, Gollhofen, Germany. Layer C: Wolfin M roofing membrane, PVC-P membrane from BMI Flachdach GmbH, Bamberg, primed with Frankolan FPO Primer from Franken-Systems GmbH, Gollhofen, Germany. Layer D: Wolfin IB roofing membrane, PVC-P membrane from BMI Flachdach GmbH, Bamberg, primed with Frankolan FPO Primer from Franken-Systems GmbH, Gollhofen, Germany. Layer E: Bauder Karat roofing membrane, polymer bitumen torch-on membrane with slate-coated top surface from Paul Bauder GmbH & Co KG, Stuttgart, Germany. Components AI + Bi AI+Bii Ai+Biii AI+BIV Ai (ne) Lane A 4 4 4 4 3 Lane B 4 4 4 3 2 Lane C 4 4 3 3 2 Track D 3 3 3 3 2 Track E 4 4 4 4 3 Components Aii + Bi Aii+Bii Aii+Biii Aii+Biv Aii (ne) Lane A 4 4 4 4 3 Lane B 3 3 3 2-3 1 Lane C 3 4 4 3 2-3 Track D 4 4 3 3 2-3 Track E 4 4 4 3-4 3 Components Aiii + B Aiii+Bii Aiii+Biii Aiii+Biv Ai (ne) Lane A 4 3 4 3 2-3 Lane B 3-4 3-4 3 2-3 2 Lane C 3 3-4 3 3 2 Track D 3-4 3-4 3 3 2-3 Track E 4 4 4 4 3 (ne = not according to the invention)

Claims

1. Two-component coating composition for construction sealing with a catalyst-co-catalyst system comprising a component A and a component B, wherein component A at least comprises: A1) a polymeric compound of the formula Y-[(CH2)b-Si-R1a-R2(3-a)]x, wherein Y is an x-valent polyether residue, optionally having urethane groups, which is bonded via an urethane group, a thiourethane group or via an optionally substituted urea group, and R1 is a methyl group and R2 is a methoxy or ethoxy group and a is equal to 0 or 1 and b is equal to 1 or 3; A2) inorganic fillers; A3) an aminosilane compound with at least one primary and / or secondary amino group; A4) compounds of the structural formula Rx-Si(OCH3)3, where Rx is a vinyl or phenyl group; A5) anti-aging agents; and wherein the component B comprises at least: B1) an organic acid or its acid salts.

2. Two-component coating composition according to claim 1, wherein component A additionally comprises a formulation adjuvant as a component A6.

3. Two-component coating composition according to claim 1 or 2, wherein component A comprises an organic solvent as a formulation adjuvant A6 in a proportion of at most 5 wt%, preferably in a proportion of at most 3 wt%, based on the total weight of components A and B.

4. Two-component coating composition according to one of the preceding claims, wherein component A comprises a plasticizer as a formulation adjuvant A6 in a proportion of at most 5 wt%, preferably in a proportion of at most 3 wt%, based on the total weight of components A and B.

5. Two-component coating composition according to one of the preceding claims, wherein component A comprises a reactive thinner as a formulation adjuvant A6.

6. Two-component coating composition according to one of the preceding claims, wherein component A comprises a liquid silicone resin as a formulation adjuvant A6.

7. Two-component coating composition according to one of the preceding claims, wherein a and b = 1, and wherein R2 is a methoxy group.

8. Two-component coating composition according to one of the preceding claims, wherein a = 0 and b = 3, and wherein R2 is a methoxy group.

9. Two-component coating composition according to one of the preceding claims, wherein component B comprises an aliphatic carboxylic acid or dicarboxylic acid.

10. Two-component coating composition according to claim 1, wherein component B comprises an aliphatic monocarboxylic acid having 1 to 16 carbon atoms.

11. Two-component coating composition according to one of the preceding claims, wherein component B additionally comprises at least one monovalent or polyvalent alcohol.

12. Two-component coating composition according to one of the preceding claims, wherein component B comprises water as a component B2.

13. Two-component coating composition according to claim 11, comprising water as component B2 in a proportion ranging from 0.05 wt% to 0.9 wt%, preferably 0.1 wt% to 0.5 wt%, based on the total weight of component A.

14. Two-component coating composition according to one of the preceding claims, having a mixing ratio A:B in a range between 1000:1 and 20:1, preferably in a range between 500 :1 and 50:1.

15. Method for construction sealing, comprising the method step of applying a two-component coating composition according to one of the preceding claims in combination with a textile.

16. Method according to claim 15, wherein expansion and / or working and / or controlled crack joints are formed in concrete constructions.