2-component polyurethane coatings with improved pot life without compromising weather resistance

Description

[0001] The present invention relates to a two-component system containing at least one specific N, S, O, and Si-containing compound. Furthermore, the invention relates to a process for producing silicon-containing polyurethanes, comprising reacting the first component with the second component of the two-component system according to the present invention and the silicon-containing polyurethanes obtained therefrom. Furthermore, the invention relates to the use of the two-component system according to the present invention for producing paints, sealants, or adhesives.

[0002] Silicon-containing two-component polyurethanes are known in the prior art. For example, WO 2017 / 042177 A1 describes a coating system based on a thioallophanate containing two NCO functionalities and a silane group. This crosslinker is incorporated into a polyurethane clearcoat formulation based on a polyisocyanate and a polyacrylate polyol. EP 2 641 925 A1 describes the synthesis of silane-terminated prepolymers and their use in two-component polyurethane formulations. WO 2014 / 037265 A1 describes the synthesis of self-crosslinking thiourethanes. It describes the self-crosslinking of the silane-terminated prepolymer as a coating material. However, these publications only disclose compositions with regard to good scratch resistance.

[0003] The object of the present invention was to provide a silicon-containing 2-component polyurethane coating which has equivalent weathering properties to conventional, non-silicon-containing 2-component polyurethane compositions.

[0004] The inventors of the present invention have also surprisingly found that with the systems according to the present invention, coating material with an extended pot life and improved scratch resistance can be obtained.

[0005] The invention relates in a first aspect to a 2-component system comprising or consisting of a first component comprising or consisting of A1) at least one compound having at least one Zerewitinoff-active group; B1) optionally at least one catalyst; C1) optionally at least one solvent; and D1) optionally at least one additive, and a second component comprising A2) at least one polyisocyanate; and B2) at least one of the following compounds according to formula (I): where R 1< to R 3< each independently of one another represent identical or different saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals having up to 18 carbon atoms, which may optionally contain up to 3 heteroatoms from the series oxygen, sulfur, nitrogen, preferably each alkyl radicals having up to 6 carbon atoms and / or alkoxy radicals having up to 6 carbon atoms, which may contain up to 3 oxygen atoms, particularly preferably each methyl, methoxy and / or ethoxy, with the proviso that at least one of the radicals R 1< , R 2< and R 3< is bonded to the silicon atom via an oxygen atom, X each independently of one another represent identical or different saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals having up to 6 carbon atoms,preferably linear alkyl radicals having 1 to 4 carbon atoms, particularly preferably a propylene radical (-CH 2 -CH 2 -CH 2 -); Y each independently of one another represent identical or different saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals having up to 18 carbon atoms, which may optionally contain up to 3 heteroatoms from the series oxygen, sulfur, nitrogen, preferably selected from isophoronyl, pentamethylene, hexamethylene, biscyclohexylmethylene, toluidenyl or methylenediphenylene; and Z represents a structural unit derived from an at least difunctional polyol having a number-average molecular weight M n of 270 to 22,000 g / mol, preferably of 500 to 18,000 g / mol, and particularly preferably of 800 to 12,000 g / mol; or represents a polyhydric alcohol and / or ether or ester alcohol,which contains 2 to 14 carbon atoms, preferably 4 to 10 carbon atoms; C2) optionally at least one solvent. D2) optionally at least one compound which is different from the compound of formula (I) and is obtained by reacting at least one isocyanate group with a secondary amine containing a silane group.

[0006] In a second aspect, the present invention relates to a process for producing silicon-containing polyurethanes, comprising reacting the first component with the second component of the 2-component system according to the present invention.

[0007] In a third aspect, the present invention relates to silicon-containing polyurethanes obtainable by the process of the present invention.

[0008] Finally, in a fourth aspect, the invention relates to the use of the 2-component system according to the present invention for producing paints, sealants or adhesives.

[0009] "At least one," as used herein, refers to 1 or more, for example, 2, 3, 4, 5, 6, 7, 8, 9, or more. In the context of components of the compounds described herein, this statement does not refer to the absolute amount of molecules, but rather to the type of component. "At least one catalyst" therefore means, for example, that only one type of catalyst or several different types of catalysts may be present, without specifying the amount of the individual compounds.

[0010] Numerical values ​​stated without decimal places refer to the full specified value with one decimal place. For example, "99%" stands for "99.0%."

[0011] The terms "approximately," "ca.", or "about," in connection with a numerical value, refer to a variance of ±10% relative to the stated numerical value, preferably ±5%, particularly preferably ±1%.

[0012] The term "substantially free of" means that the respective compound may in principle be present, but then in an amount that does not impair the function of the other components. Therefore, within the context of the present invention, the property "substantially free of" a particular compound is preferably considered to mean a total weight of less than 0.1 wt.%, more preferably less than 0.001 wt.%, in particular free of the compound, based on the total weight of the composition or system.

[0013] Numerical ranges specified in the format "in / from x to y" include the specified values. If multiple preferred numerical ranges are specified in this format, it goes without saying that all ranges resulting from the combination of the different endpoints will also be included.

[0014] Molecular weight data refer to the weight-average molecular weight in g / mol unless the number-average molecular weight is explicitly stated. Molecular weights are preferably determined by GPC using polystyrene standards.

[0015] In particular, the invention relates to: 1. A 2-component system comprising or consisting of a first component which comprises A1) at least one compound having at least one Zerewitinoff-active group; B1) optionally at least one catalyst; C1) optionally at least one solvent; and D1) optionally comprises or consists of at least one additive and a second component which comprises A2) at least one polyisocyanate; and B2) at least one of the following compounds according to formula (I): where R 1< to R 3< each independently of one another represent identical or different saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals having up to 18 carbon atoms, which may optionally contain up to 3 heteroatoms from the series oxygen, sulfur, nitrogen, preferably each alkyl radicals having up to 6 carbon atoms and / or alkoxy radicals having up to 6 carbon atoms, which may contain up to 3 oxygen atoms, particularly preferably each methyl, methoxy and / or ethoxy, with the proviso that at least one of the radicals R 1< , R 2< and R 3< is bonded to the silicon atom via an oxygen atom, X each independently of one another represent identical or different saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals having up to 6 carbon atoms,preferably linear alkyl radicals having 1 to 4 carbon atoms, particularly preferably a propylene radical (-CH 2 -CH 2 -CH 2 -); Y each independently of one another represent identical or different saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals having up to 18 carbon atoms, which may optionally contain up to 3 heteroatoms from the series oxygen, sulfur, nitrogen, preferably selected from isophoronyl, pentamethylene, hexamethylene, biscyclohexylmethylene, toluidenyl or methylenediphenylene; and Z represents a structural unit derived from an at least difunctional polyol having a number-average molecular weight M n of 270 to 22,000 g / mol, preferably of 500 to 18,000 g / mol, and particularly preferably of 800 to 12,000 g / mol; or represents a polyhydric alcohol and / or ether or ester alcohol,which contains 2 to 14 carbon atoms, preferably 4 to 10 carbon atoms; C2) optionally at least one solvent. D2) optionally at least one compound which is different from the compound of formula (I) and is obtained by reacting at least one isocyanate group with a secondary amine containing a silane group. 2. The 2-component system according to item 1, characterized in that the at least one compound A1 is selected from polyols, polyamines, polyether polyols, polyester polyols, polyurethane polyols, polysiloxane polyols, polycarbonate polyols, polyether polyamines, polybutadiene polyols, polyacrylate polyols and polymethacrylate polyols and copolymers thereof, preferably the at least one compound A1 is selected from polyacrylate polyols and polymethacrylates and copolymers thereof, polyester polyols and polyurethanes,More preferably, the at least one compound A1 is a polyol, polyacrylate polyol, or polymethacrylate, and a copolymer thereof. 3. The 2-component system according to item 1 or 2, characterized in that the at least one catalyst B1 is selected from the class of tin catalysts, bismuth catalysts, zinc catalysts, zirconium catalysts, and amine bases. More preferably, the at least one catalyst B1 is selected from metal salts such as zinc chloride, zinc 2-ethylcaproate, tin(II) octanoate, tin(II) ethylcaproate, dibutyltin(IV) dilaurate, zirconium(IV) isopropylate, zirconium(IV) n-butylate, zirconium(IV) 2-ethylhexanoate, zirconyl octanoate, bismuth(III) 2-ethylhexanoate, and bismuth(III) octoate. 4. The 2-component system according to one of the preceding items, characterized in that the at least one solvent C1 is selected from aromatic solvents and aliphatic solvents, preferably from esters, ethers,Benzene and its derivatives; more preferably, the at least one solvent C1 is selected from butyl acetate, 1-methoxy-2-propyl acetate, 3-methoxy-1-butyl acetate, ethyl acetate, dibasic ester, propylene n-butyl ether, methyl ethyl ketone, toluene, xylene, solvent naphtha (hydrocarbon mixture), and mixtures thereof. 5. The 2-component system according to any one of the preceding claims, characterized in that the at least one additive D1 is selected from UV stabilizers, antioxidants, and flow control agents, or mixtures thereof; more preferably, the at least one additive is selected from UV stabilizers based on cyanoacrylates, oxalanilides, benzophenones, benzotriazoles, triazines, HALS amines (hindered amine light stabilizers), and silicone-free and silicone-containing flow control agents.Particularly preferred are the UV stabilizers Tinuvin 292 and Tinuvin 1130 and the leveling agents BYK 141 and BYK 311. 6. The 2-component system according to one of the preceding claims, characterized in that the at least one polyisocyanate A2 is selected from di- or triisocyanates, such as 1,4-butane diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, 4-isocyanatomethyl-1,8-octane diisocyanate, 4,4'-methylenebis(cyclohexyl isocyanate), 1,10-decamethylene diisocyanate, 3,5,5-trimethyl-1-isocyanato-3-isocyanatomethylcyclohexane, 1,3- and 1,4-bis(isocyanatomethyl)cyclohexane, isophorone diisocyanate, 1,5-naphthalene diisocyanate, diisocyanatodiphenylmethane, such as 2,2'-, 2,4'- and 4,4'-MDI or mixtures thereof, diisocyanatomethylbenzene, such as 2,4- and 2,6-toluene diisocyanate, and technical mixtures of the two isomers as well as 1,3- and / or 1,4-bis(isocyanatomethyl)benzene, 3,3'-dimethyl-4,4'-biphenyl diisocyanate, 1,4-Paraphenylene diisocyanate and cyclohexyl diisocyanate and the aforementioned, individually or in mixtures, higher molecular weight oligomers with biuret, uretdione, isocyanurate, iminooxadiazinedione, allophanate, urethane and carbodiimide / uretonimine structural units. Polyisocyanates based on aliphatic and cycloaliphatic diisocyanates are preferably used. More preferably, the at least one polyisocyanate A2 is selected from hexamethylene diisocyanate, pentamethylene diisocyanate and isophorone diisocyanate. 7. The 2-component system according to one of the preceding claims, characterized in that D2 is selected from i) at least one compound of formula (II), where R 1< , R 2< and R 3< each independently of one another represent identical or different saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals having up to 18 carbon atoms, which may optionally contain up to 3 heteroatoms from the series oxygen, sulfur, nitrogen, preferably each alkyl radicals having up to 6 carbon atoms and / or alkoxy radicals having up to 6 carbon atoms, which may contain up to 3 oxygen atoms, particularly preferably each methyl, methoxy and / or ethoxy, with the proviso that at least one of the radicals R 1< , R 2< and R 3< is bonded to the silicon atom via an oxygen atom, X represents a linear or branched organic radical having up to 6, preferably a linear alkyl radical having 1 to 4 carbon atoms,particularly preferably represents a propylene radical (-CH 2 -CH 2 -CH 2 -) and Y represents a linear or branched, aliphatic or cycloaliphatic radical having 4 to 18 carbon atoms. W independently of one another represent a formyl or acetyl group or else a COO group with a radical G, G can be mono-, di-, tri- or tetrafunctional and represents a linear or branched, aliphatic or cycloaliphatic radical or a linking unit derived therefrom having 4 to 18 carbon atoms or an optionally substituted aromatic or araliphatic radical; and / or ii) at least one compound of formula (III) wherein X is each independently selected from alkoxy or alkyl radicals, or two radicals X form with the silicon atom to which they are bonded a Si-substituted hydrocarbon ring, each having up to 10 carbon atoms, with the proviso that the Si atom has at least one alkoxy radical,Q is a difunctional linear or branched aliphatic radical having up to 10 carbon atoms, preferably -CH 2 - or -(CH 2 ) 3 -, in particular -(CH 2 ) 3 -; and Z is an alkoxy radical having 1 to 10 carbon atoms. 8. The 2-component system according to any one of the preceding claims, characterized in that B2 preferably has an isocyanate content of less than 2%, more preferably an isocyanate content of less than 1%. 9. The 2-component system according to any one of the preceding claims, characterized in that the constituents of the first component, parts by weight A1 and parts by weight B1, are present in a ratio of 0.5 to 8 by weight to the components, parts by weight C1 and parts by weight D1, preferably in a weight ratio of 0.8 to 4. 10. The 2-component system according to any one of the preceding claims, characterized in that the constituents of the second component, parts by weight A2 and parts by weight B2, are present in a weight ratio of 0.5 to 10 by weight to the components, parts by weight C2 and parts by weight D2, in a weight ratio of 1 to 8. 11. The 2-component system according to one of the preceding objects, characterized in that the constituents of the first component, parts by weight A1, and optionally parts by weight B1, parts by weight C1 and parts by weight D1 to the constituents of the second component, parts by weight A2, wt.-Parts B2 and optionally parts by weight of C2 and parts by weight of D2 are present in a weight ratio of 0.6 to 11, more preferably in a weight ratio of 0.8 to 8. 12. A process for producing silicon-containing polyurethanes, comprising reacting the first component with the second component of the 2-component system according to the present invention. 13. Silicon-containing polyurethanes obtainable by the process according to item 12. 14. Use of the 2-component system according to the present invention for producing paints, sealants or adhesives. .

[0016] The 2-component system contains a first component which contains at least one compound with at least one Zerewitinoff-active group, hereinafter also referred to as compound A1.

[0017] Suitable for this compound are all compounds known to the person skilled in the art which contain at least one NCO-reactive group with at least one Zerewitinoff-active group. Particularly suitable compounds have an average OH or NH functionality of at least 1.5. These can be, for example, diols (e.g., 1,2-ethanediol, 1,3- or 1,2-propanediol, 1,4-butanediol), triols (e.g., glycerol, trimethylolpropane), and tetraols (e.g., penterythritol), polyamines, but also polyhydroxy compounds such as polyether polyols, polyester polyols, polyurethane polyols, polysiloxane polyols, polycarbonate polyols, polyether polyamines, polybutadiene polyols, polyacrylate polyols, and / or polymethacrylate polyols, as well as copolymers thereof, hereinafter referred to as polyacrylate polyols.

[0018] In a preferred embodiment, compound A1 is a polyhydroxy compound. The polyhydroxy compounds preferably have weight-average molecular weights Mw > 500 g / mol, measured by gel permeation chromatography (GPC) against a polystyrene standard, particularly preferably between 800 and 100,000 g / mol, in particular between 1,000 and 50,000 g / mol. The polyhydroxy compounds preferably have an OH number of 30 to 400 mg KOH / g, in particular between 100 and 300 KOH / g. The hydroxyl number (OH number) indicates how many mg of potassium hydroxide are equivalent to the amount of acetic acid bound by 1 g of substance during acetylation. For the determination, the sample is boiled with acetic anhydride-pyridine, and the resulting acid is titrated with potassium hydroxide solution (DIN 53240-2 2:2007-11).

[0019] The glass transition temperatures of the polyhydroxy compounds, measured using DSC measurements according to DIN-EN-ISO 11357-2-2:2014-07, are preferably between -150 and 100 °C, particularly preferably between -120 °C and 80 °C. Polyether polyols are accessible in a conventional manner by alkoxylation of suitable starter molecules under base catalysis or using double metal cyanide compounds (DMC compounds). Suitable starter molecules for the production of polyether polyols include, for example, simple, low-molecular-weight polyols, water, organic polyamines with at least two NH bonds, or any mixtures of such starter molecules.

[0020] Preferred starter molecules for the preparation of polyether polyols by alkoxylation, particularly by the DMC process, are, in particular, simple polyols such as ethylene glycol, 1,3-propylene glycol and 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, 2-ethylhexanediol, 1,3-glycerol, trimethylolpropane, penterythritol, as well as low-molecular-weight, hydroxyl-containing esters of such polyols with dicarboxylic acids of the type exemplified below, or low-molecular-weight ethoxylation or propoxylation products of such simple polyols, or any mixtures of such modified or unmodified alcohols. Alkylene oxides suitable for alkoxylation are, in particular, ethylene oxide and / or propylene oxide, which can be used in any order or as a mixture during the alkoxylation.

[0021] Suitable polyester polyols are described, for example, in EP-A-0 994 1 17 and EP-A-1 273 640. Polyester polyols can be prepared in a known manner by polycondensation of low molecular weight polycarboxylic acid derivatives, such as succinic acid, adipic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, tetrachlorophthalic anhydride, endomethylenetetrahydrophthalic anhydride, glutaric anhydride, maleic acid, maleic anhydride, fumaric acid, dimer fatty acid, trimer fatty acid, phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, citric acid or trimellitic acid, with low molecular weight polyols, such as ethylene glycol, diethylene glycol, neopentyl glycol, hexanediol, butanediol, propylene glycol, glycerol, trimethylolpropane, 1,4-hydroxymethylcyclohexane, 2-methyl-1,3-propanediol, butanetriol-1,2,4, triethylene glycol, Tetraethylene glycol, polyethylene glycol, dipropylene glycol, polypropylene glycol,Dibutylene glycol and polybutylene glycol, or by ring-opening polymerization of cyclic carboxylic acid esters, such as e-caprolactone. Furthermore, hydroxycarboxylic acid derivatives, such as lactic acid, cinnamic acid, or hydroxycaproic acid, can also be polycondensed to form polyester polyols. However, polyester polyols of oleochemical origin can also be used. Such polyester polyols can be produced, for example, by complete ring opening of epoxidized triglycerides of an at least partially olefinically unsaturated fatty acid-containing fat mixture with one or more alcohols having 1 to 12 carbon atoms, followed by partial transesterification of the triglyceride derivatives to form alkyl ester polyols having 1 to 12 carbon atoms in the alkyl radical.

[0022] Suitable polyurethane polyols are preferably prepared by reacting polyester polyol prepolymers with suitable di- or polyisocyanates and are described, for example, in EP-A-1 273 640. Suitable polysiloxane polyols are described, for example, in WO-A-01 / 09260, where the polysiloxane polyols listed therein can preferably be used in combination with other polyhydroxy compounds, in particular those with higher glass transition temperatures. The polyacrylate polyols particularly preferred according to the invention are generally copolymers and preferably have weight-average molecular weights Mw between 1,000 and 20,000 g / mol, in particular between 1,500 and 10,000 g / mol, in each case measured by gel permeation chromatography (GPC) against a polystyrene standard.The glass transition temperature of the copolymers is generally between -100 and 100 °C, in particular between -50 and 80 °C (measured by DSC measurements according to DIN-EN-ISO 11357-2-2:2014-07).

[0023] Preferred poly(meth)acrylate polyols have an OH number of 60 to 250 mg KOH / g, in particular between 70 and 200 mg KOH / g, and an acid number between 0 and 30 mg KOH / g. The acid number indicates the number of mg of potassium hydroxide consumed to neutralize 1 g of the respective compound (DIN EN ISO 21 14).

[0024] The preparation of suitable poly(meth)acrylate polyols is known per se to the person skilled in the art. They are prepared by radical polymerization of hydroxyl-containing, oleochemically unsaturated monomers or by radical copolymerization of hydroxyl-containing, oleochemically unsaturated monomers with, if appropriate, other oleochemically unsaturated monomers, such asEthyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, butyl acrylate, butyl methacrylate, isobutyl acrylate, isobutyl methacrylate, tert-butyl acrylate, tert-butyl methacrylate, amyl acrylate, amyl methacrylate, hexyl acrylate, hexyl methacrylate, ethylhexyl acrylate, ethylhexyl methacrylate, 3,3,5-trimethylhexyl acrylate, 3,3,5-trimethylhexyl methacrylate, stearyl acrylate, stearyl methacrylate, lauryl acrylate or lauryl methacrylate, cycloalkyl acrylates and / or cycloalkyl methacrylates, such as cyclopentyl acrylate, cyclopentyl methacrylate, isobornyl acrylate, isobornyl methacrylate or in particular cyclohexyl acrylate and / or cyclohexyl methacrylate.Suitable olefinically unsaturated monomers containing hydroxyl groups are in particular 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl acrylate, 3-hydroxypropyl methacrylate, 3-hydroxybutyl acrylate, 3-hydroxybutyl methacrylate and in particular 4-hydroxybutyl acrylate and / or 4-hydroxybutyl methacrylate.

[0025] Further monomer building blocks for the polyacrylate polyols that can be used are vinyl aromatic hydrocarbons, such as vinyltoluene, alpha-methylstyrene or in particular styrene, amides or nitriles of acrylic or methacrylic acid, vinyl esters or vinyl ethers, and in minor amounts, in particular acrylic and / or methacrylic acid.

[0026] Preferred poly(meth)acrylate polyols are at least one difunctional polymeric polyol having a number-average molecular weight according to GPC (in g / mol), determined according to DIN 55672:2016-03, in the range from 270 to 22,000 g / mol, preferably from 500 to 18,000 g / mol, particularly preferably from 800 to 12,000 g / mol.

[0027] The first component may further contain at least one catalyst suitable for catalyzing the reaction of the first component with the second component. Such catalysts are known to those skilled in the art. Suitable catalysts include tin catalysts, bismuth catalysts, zinc catalysts, zirconium catalysts, and amine bases.

[0028] Particularly suitable are, for example, zinc compounds such as zinc (II) stearate, zinc (II) n-octanoate, zinc (II) 2-ethyl-1-hexanoate, zinc (II) naphthenate, zinc chloride, zinc 2-ethylcaproate or zinc (II) acetylacetonate, tin compounds such as tin (II) n-octanoate, tin (II) 2-ethyl-1-hexanoate, tin (II) laurate, dibutyltin oxide, dibutyltin dichloride, dibutyltin diacetate, tin (II) ethylcaproate, dibutyltin (IV) dilaurate, dibutyltin dimaleate or dioctyltin diacetate, zirconium compounds such as, for example, B. zirconium (IV) 2-ethyl-1-hexanoate, zirconium (IV) isopropylate, zirconium (IV) n-butylate, zirconium (IV) 2-ethylhexanoate, zirconyl octanoate, zirconium (IV) neodecanoate, zirconium (IV) naphthenate or Zirconium (IV) acetylacetonate, bismuth (III) 2-ethylhexanoate and bismuth (III) octoate.

[0029] The catalyst is preferably used in amounts of 0.01 to 0.5 wt.%, more preferably in amounts of 0.03 to 0.3 wt.%, based on the total weight of compound A1 of the first component and A1 and B1 of the second component.

[0030] The first component can preferably further contain at least one solvent. In general, all solvents known to those skilled in the art are suitable. Particularly suitable are aromatic and aliphatic solvents, preferably selected from butyl acetate, 1-methoxy-2-propyl acetate, 3-methoxy-1-butyl acetate, ethyl acetate, dibasic ester, propylene n-butyl ether, methyl ethyl ketone, toluene, xylene, solvent naphtha (hydrocarbon mixture), and mixtures thereof.

[0031] The solvent is preferably present in 30 to 90 wt.%, particularly preferably in 45 to 70 wt.%, based on the total weight of the first component.

[0032] The first component may optionally further contain at least one additive. Generally, any additives known to those skilled in the art are suitable. UV stabilizers, antioxidants, flow agents, fillers, and / or pigments are preferred.

[0033] Suitable UV stabilizers can preferably be selected from the group consisting of piperidine derivatives, such as 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 4-benzoyloxy-1,2,2,6,6-pentamethylpiperidine, bis-(2,2,6,6-tetra-methyl-4-piperidyl)-sebacate, bis(1,2,2,6,6-pentamethyl-1-4-piperidinyl)-sebacate, bis-(2,2,6,6-tetramethyl-4-piperidyl)-su-berate, bis-(2,2,6,6-tetramethyl-4-piperidyl)-dodecanedioate; benzophenone derivatives such as 2,4-dihydroxy, 2-hydroxy-4-methoxy, 2-hydroxy-4-octoxy, 2-hydroxy-4-dodecyloxy or 2,2'-dihydroxy-4-dodecyloxy-benzophenone; Benztriazole derivatives, such as2-(2H-Benzotriazol-2-yl)-4,6-di-tert-pentylphenol, 2-(2H-Benzotriazol-2-yl)-6-dodecyl-4-methylphenol, 2-(2H-Benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol, 2-(5-Chlor-2H-benzotriazol-2-yl)-6-(1,1-dimethylethyl)-4-methylphenol, 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol, 2-(2H-Benzotriazol-2-yl)-6-(1-methyl-1-phenylethyl)-4-(1,1,3,3-tetramethylbutyl)phenol, Isooctyl-3-(3-(2H-benzotriazol-2-yl)-5-(1,1-dimethylethyl)-4-hydroxyphenylpropionat), 2-(2H-Benzotriazol-2-yl)-4,6-bis(1,1-dimethylethyl)phenol, 2-(2H-Benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol, 2-(5-Chlor-2H-benzotriazol-2-yl)-4,6-bis(1,1-dimethylethyl)phenol; Oxalaniliden, wie z.B. 2-Ethyl-2'-ethoxy- oder 4-Methyl-4'-methoxyoxalanilid; Salicylsäureestern, wie z.B. Salicylsäurephenylester, Salicylsäure-4-tert-butylphenylester, Salicylsäure-4-tert-octylphenylester; Zimtsäureesterderivaten, wie z.B.Methyl α-cyano-β-methyl-4-methoxycinnamate, butyl α-cyano-β-methyl-4-methoxycinnamate, ethyl α-cyano-β-phenylcinnamate, isooctyl α-cyano-β-phenylcinnamate; and malonic ester derivatives, such as dimethyl 4-methoxybenzylidenemalonate, diethyl 4-methoxybenzylidenemalonate, and dimethyl 4-butoxybenzylidenemalonate. These preferred UV stabilizers can be used individually or in any combination. Particularly preferred UV stabilizers are available under the trade names Tinuvin 292 and Tinuvin 1130 from BASF.

[0034] Preferred UV absorbers are DL-alpha-tocopherol, tocopherol, cinnamic acid derivatives and cyanoacrylates.

[0035] Sterically hindered amines (often referred to as HALS or HAS compounds; Hindered Amine (Light) Stabilizers) such as 2,2,6,6-tetramethylpiperidine, 2,6-di-tert-butylpiperidine or their derivatives, e.g., bis-(2,2,6,6-tetramethyl-4-piperidyl)sebacinate, also serve as suitable UV absorbers. These are available, for example, as Tinuvin ®< and Chimaassorb ®< brands from BASF SE. N-alkylated radical scavengers are, for example, bis(1,2,2,6,6-pentamethyl-4-piperidinyl)-[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]butylmalonate (e.g., Tinuvin ®< 144 from BASF); a mixture of bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate and methyl(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate (e.g. Tinuvin 292 from BASF SE); or which are N-(o-alkylated), such as decanedioic acid bis-(2,2,6,6-tetramethyl-1-(octyloxy)-4-piperidinyl) ester, reaction products with 1,1-dimethylethyl hydroperoxide and octane (e.g.Tinuvin ®< 123 from BASF SE), and specifically the HALS triazine "2-aminoethanol, reaction products with cyclohexane and peroxidized N-butyl-2,2,6,6-tetramethyl-4piperidinamine-2,4,6-trichloro-1,3,5-triazine reaction product" (e.g. Tinuvin ®< 152 from BASF SE).

[0036] Optionally, one or more of the UV stabilizers of the first component mentioned by way of example are used, preferably in amounts of 0.0001 to 3.0% by weight, particularly preferably 0.001 to 2% by weight, based on the total weight of compound A1 of the first component and compounds A2 and B2 of the second component.

[0037] Other suitable antioxidants are preferably sterically hindered phenols, which can preferably be selected from the group consisting of 2,6-di-tert-butyl-4-methylphenol (ionol), pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, triethylene glycol bis(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate, 2,2'-thio-bis(4-methyl-6-tert-butylphenol) and 2,2'-thio-diethyl-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]. These can be used individually or in any combination with one another if required.

[0038] Antioxidants are preferably used in amounts of 0.001 to 3.0 wt.%, particularly preferably 0.02 to 2.0 wt.%, calculated as the total amount of antioxidants used in relation to the total weight of compound A1 of the first component and compound A2 and B2 of the second component.

[0039] To improve substrate wetting, suitable leveling agents, for example organically modified siloxanes such as polyether-modified siloxanes, polyacrylates, and / or fluorosurfactants, may optionally be present. These leveling agents are preferably present in amounts of 0.01 wt.% to 3 wt.%, preferably 0.01 wt.% to 2 wt.%, particularly preferably 0.05 to 1.5 wt.%, calculated as the total amount of leveling agents used relative to the total weight of compound A1 of the first component. Preferred leveling agents are commercially available under the trade names BYK 141 and BYK 311 from Altana.

[0040] The second component comprises at least one polyisocyanate.

[0041] In principle, all polyisocyanates known to the person skilled in the art as suitable for the production of polyisocyanate polyaddition products, in particular polyurethanes, can be used as polyisocyanates, in particular the group of organic aliphatic, cycloaliphatic, araliphatic and / or aromatic polyisocyanates having at least two isocyanate groups per molecule and mixtures thereof. Examples of such polyisocyanates are di- or triisocyanates, such as 1,4-butane diisocyanate, 1,5-pentane diisocyanate (pentamethylene diisocyanate, PDI), 1,6-hexane diisocyanate (hexamethylene diisocyanate, HDI), 4-isocyanatomethyl-1,8-octane diisocyanate (triisocyanatononane, TIN), 4,4'-methylenebis(cyclohexyl isocyanate) (H 12 MDI), 3,5,5-trimethyl-1-isocyanato-3-isocyanatomethylcyclohexane (isophorone diisocyanate, IPDI), 1,3- and 1,4-bis(isocyanatomethyl)cyclohexane (HfrXDI), 1,5-naphthalene diisocyanate, diisocyanatodiphenylmethane (2,2'-, 2,4'- and 4,4'-MDI or mixtures thereof),Diisocyanatomethylbenzene (2,4- and 2,6-tolylene diisocyanate, TDI) and technical mixtures of the two isomers, as well as 1,3- and / or 1,4-bis(isocyanatomethyl)benzene (XDI), 3,3'-dimethyl-4,4'-biphenyl diisocyanate (TODI), 1,4-paraphenylene diisocyanate (PPDI), and cyclohexyl diisocyanate (CHDI), and the higher molecular weight oligomers containing biuret, uretdione, isocyanurate, iminooxadiazinedione, allophanate, urethane, and carbodiimide / uretonimine structural units, available individually or in mixtures. Polyisocyanates based on aliphatic and cycloaliphatic diisocyanates are preferred.

[0042] Preferably, the at least one polyisocyanate is selected from di- or triisocyanates, such as 1,4-butane diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, 4-isocyanatomethyl-1,8-octane diisocyanate, 4,4'-methylenebis(cyclohexyl isocyanate), 1,10-decamethylene diisocyanate, 3,5,5-trimethyl-1-isocyanato-3-isocyanatomethylcyclohexane, 1,3- and 1,4-bis(isocyanatomethyl)cyclohexane, isophorone diisocyanate, 1,5-naphthalene diisocyanate, diisocyanatodiphenylmethane, such as 2,2'-, 2,4'- and 4,4'-MDI or mixtures thereof, diisocyanatomethylbenzene, such as 2,4- and 2,6-tolylene diisocyanate, and technical mixtures of the two isomers and 1,3- and / or 1,4-bis(isocyanatomethyl)benzene, 3,3'-dimethyl-4,4'-biphenyl diisocyanate, 1,4-paraphenylene diisocyanate and cyclohexyl diisocyanate and the higher molecular weight oligomers containing biuret, uretdione, isocyanurate, iminooxadiazinedione, allophanate, urethane and carbodiimide / uretonimine structural units obtained from the above-mentioned, individually or in mixtures,Polyisocyanates based on aliphatic and cycloaliphatic diisocyanates are preferably used; more preferably, the at least one polyisocyanate A2 is selected from hexamethylene diisocyanate, pentamethylene diisocyanate and isophorone diisocyanate.

[0043] Furthermore, the second component contains at least one compound of formula (I) where R 1< to R 3< each independently of one another represent identical or different saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals having up to 18 carbon atoms, which may optionally contain up to 3 heteroatoms from the series oxygen, sulfur, nitrogen, preferably each alkyl radicals having up to 6 carbon atoms and / or alkoxy radicals having up to 6 carbon atoms, which may contain up to 3 oxygen atoms, particularly preferably each methyl, methoxy and / or ethoxy, with the proviso that at least one of the radicals R 1<, R 2< and R 3< is bonded to the silicon atom via an oxygen atom, X each independently of one another represent identical or different saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals having up to 6 carbon atoms,preferably linear alkyl radicals having 1 to 4 carbon atoms, particularly preferably a propylene radical (-CH 2 -CH 2 -CH 2 -); Y each independently of one another represent identical or different saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals having up to 18 carbon atoms, which may optionally contain up to 3 heteroatoms from the series oxygen, sulfur, nitrogen, preferably selected from isophoronyl, pentamethylene, hexamethylene, biscyclohexylmethylene, toluidenyl or methylenediphenylene; and Z represents a structural unit derived from an at least difunctional polyol having a number-average molecular weight M n of 270 to 22,000 g / mol, preferably of 500 to 18,000 g / mol, and particularly preferably of 800 to 12,000 g / mol; or represents a polyhydric alcohol and / or ether or ester alcohol,which contains 2 to 14 carbon atoms, preferably 4 to 10 carbon atoms. ,

[0044] Suitable and preferred difunctional polyols from which the structural unit Z in formula (I) can be derived are the (polymeric) polyols already described above, with the same preferences applying. Suitable and preferred polyols and silane-functional prepolymers obtained therefrom are the polyols disclosed in WO 2018 / 029197 A1, which can preferably be prepared by the processes described therein.

[0045] Alternatively to the above definition of Z in formula (I), according to a further embodiment, Z represents a structural unit derived from a polyhydric alcohol and / or ether or ester alcohol as a polyol containing 2 to 14 carbon atoms, preferably 4 to 10 carbon atoms.

[0046] As an alternative to the above definition of Z in formula (I), suitable polyols of this type, also referred to as low molecular weight, are polyhydric alcohols and / or ether or ester alcohols, such as, for example, 1,2-ethanediol, 1,2- and 1,3-propanediol, the isomeric butanediols, pentanediols, hexanediols, heptanediols and octanediols, 1,10-decanediol, 1,12-dodecanediol, 1,2- and 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, 1,4-bis(2-hydroxyethoxy)benzene, 2,2-bis(4-hydroxyphenyl)propane (bisphenol A), 2,2-bis(4-hydroxycyclohexyl)propane (perhydrobisphenol), 1,2,3-propanetriol, 1,2,4-butanetriol, 1,1,1-Trimethylolethane, 1,2,6-hexanetriol, 1,1,1-trimethylolpropane (TMP), bis-(2-hydroxyethyl)-hydroquinone, 1,2,4- and 1,3,5-trihydroxycyclohexane, 1,3,5-tris(2-hydroxyethyl)-isocyanurate, bis(hydroxymethyl)-tricyclo[5.2.1.02'6]-decane, 4,8-bis(hydroxymethyl)tricyclo-[5.2.1.02,6]-decane and 5,8-bis(hydroxymethyl)-tricyclo-[5.2.1.Containing [O']-decane, where the compounds can be present individually or in a mixture of isomers. Di-trimethylolpropane, 2,2-bis(hydroxymethyl)-1,3-propanediol (pentaerythritol), 2,2,6,6-tetrakis(hydroxymethyl)-4-oxa-heptane-1,7-diol (dipentaerythritol), mannitol or sorbitol, low molecular weight ether alcohols such as diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol or dibutylene glycol, or low molecular weight ester alcohols such as neopentyl glycol hydroxypivalate.

[0047] Preferred examples of such isocyanatosilanes with thiourethane structure are the reaction products of 2-mercaptoethyltrimethoxysilane, 2-mercaptoethylmethyldimethoxysilane, 2-mercaptoethyltrimethoxysilane, 2-mercaptoethyltriethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyldimethylmethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropylmethyldiethoxysilane, 3-mercaptopropylethyldimethoxysilane, 3-mercaptopropylethyldiethoxysilane and / or 4-mercaptobutyltrimethoxysilane with 1,5-diisocyanatopentane, 1,6-diisocyanatohexane, 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane, 2,4'- and / or 4,4'-Diisocyanatodicyclohexylmethane or any mixtures of these diisocyanates.

[0048] Particularly preferred alkoxysilane-functional isocyanates of the present invention are isocyanatomethyltrimethoxysilane, isocyanatomethyltriethoxysilane, 3-isocyanatopropyltrimethoxysilane and 3-isocyanatopropyltriethoxysilane, the isocyanatosilanes with thiourethane structure obtainable by the process of WO 2014 / 037279 A1 by reacting 3-mercaptopropyltrimethoxysilane and / or 3-mercaptopropyltriethoxysilane with 1,5-diisocyanatopentane, 1,6-diisocyanatohexane, 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane, 2,4'- and / or 4,4'-diisocyanatodicyclohexylmethane, and any desired mixtures of such isocyanatosilanes.

[0049] The use of the above-mentioned isocyanatosilanes with thiourethane structure is particularly preferred.

[0050] Furthermore, the second component may optionally contain at least one solvent. The solvents described above for the first component are also suitable. Furthermore, the preferred embodiments for the first component are also preferred for the second component.

[0051] The second component may optionally contain at least one compound (D2) which is different from the compound of formula (I) and is obtained by reacting at least one isocyanate group with a secondary amine containing a silane group.

[0052] Preferred compounds for component D2 have the general formula (II) on, whereby R 1< , R 2< and R 3< independently of one another represent identical or different saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals having up to 18 carbon atoms, which may optionally contain up to 3 heteroatoms from the series oxygen, sulfur, nitrogen, preferably each represent alkyl radicals having up to 6 carbon atoms and / or alkoxy radicals having up to 6 carbon atoms, which may contain up to 3 oxygen atoms, particularly preferably each represent methyl, methoxy and / or ethoxy, with the proviso that at least one of the radicals R 1< , R 2< and R 3< is bonded to the silicon atom via an oxygen atom, X represents a linear or branched organic radical having up to 6, preferably 1 to 4 carbon atoms, particularly preferably a propylene radical (-CH 2 -CH 2 -CH 2 -) and Y represents a linear or branched,aliphatic or cycloaliphatic radical having 4 to 18 carbon atoms or an optionally substituted aromatic or araliphatic radical having 6 to 18 carbon atoms, preferably a linear or branched, aliphatic or cycloaliphatic radical having 6 to 13 carbon atoms, and W, independently of one another, represents a formyl or acetyl group or a COO group with a radical G, G can be mono-, di-, tri- or tetrafunctional and represents a linear or branched, aliphatic or cycloaliphatic radical or a linking unit derived therefrom having 4 to 18 carbon atoms or an optionally substituted aromatic or araliphatic radical or a linking unit derived therefrom having 6 to 18 carbon atoms, preferably a linear or branched,aliphatic or cycloaliphatic radical having 6 to 13 carbon atoms. Optionally, the radical W may contain one or more heteroatoms selected from the group consisting of oxygen, sulfur, and nitrogen.

[0053] Alternatively, suitable compounds (D2) are obtained by reacting at least one isocyanate group with a secondary amine containing a silane group, suitable secondary amines containing a silane group being, for example, aspartic acid esters as described in EP-A-0 596 360. In these molecules of the general formula (III) is X is each independently selected from alkoxy or alkyl radicals, or two radicals X form with the silicon atom to which they are bonded an Si-substituted hydrocarbon ring, each having up to 10 carbon atoms, with the proviso that the Si atom has at least one alkoxy radical, Q is a difunctional linear or branched aliphatic radical having up to 10 carbon atoms, preferably -CH 2 - or -(CH 2 ) 3 -, in particular -(CH 2 ) 3 -; and Z is each an alkoxy radical having 1 to 10 carbon atoms.

[0054] The use of such aspartic acid esters is preferred. Examples of particularly preferred aspartic acid esters are diethyl N-(3-triethoxysilylpropyl)aspartic acid, diethyl N-(3-trimethoxysilylpropyl)aspartic acid, and diethyl N-(3-dimethoxymethylsilylpropyl)aspartic acid. The use of diethyl N-(3-triethoxysilylpropyl)aspartic acid is very particularly preferred.

[0055] These suitable and preferred secondary amines containing a silane group can be reacted with any polyisocyanates to form the polyurea prepolymers (D2). Polyurea prepolymers (D2) prepared from compounds of formula (III) are preferred, as described and prepared in EP-A-0 994 117.

[0056] The first and second components are preferably reacted in an NCO-OH ratio of 1:1.2 to 1.2:1, in particular 1:1.

[0057] When formulating paints, sealants, or adhesives, any other conventional auxiliaries and additives, such as UV stabilizers (see above), antioxidants (see above), water scavengers, slip additives, defoamers, flow control agents, rheology additives, flame retardants, fillers, and / or pigments, can also be added to the polyurethanes containing silane groups according to the invention. In addition to being used as sole binders, the process products according to the invention can also be admixed, for example, as an additive to conventional 1K or 2K polyurethane systems, for example to achieve very specific properties, such as improving adhesion.

[0058] The polyurethane-formulated coatings, varnishes, sealants, or adhesives containing the silane groups according to the invention can be applied by conventional methods, for example by spraying, brushing, dipping, flow coating, or by roller or doctor blade application in one or more layers. Any substrates can be used, such as metal, wood, glass, stone, ceramic materials, concrete, rigid and flexible plastics, textiles, leather, and paper, which can optionally also be coated with conventional primers prior to coating.

[0059] A further subject of the invention are therefore the above-mentioned substrates coated with polyurethanes containing silane groups according to the invention.

[0060] The coatings are preferably applied in a temperature range of 0 °C to 120 °C, more preferably between 15 °C and 90 °C.

[0061] By reacting the 2-component system, a silicon-containing polyurethane is obtained. Examples

[0062] The following examples serve to illustrate the present invention, but should in no way be understood as a limitation of the scope of protection.

[0063] Unless otherwise stated, all percentages are based on weight.

[0064] All experiments were conducted at 23 °C and 50% relative humidity.

[0065] The NCO content was determined titrimetrically according to DIN EN ISO 11909:2007-05.

[0066] The solid content was determined according to DIN EN ISO 3251:2008-06.

[0067] All viscosity measurements were performed using a Physica MCR 51 rheometer from Anton Paar Germany GmbH (DE) according to DIN EN ISO 3219 / A:1994-10.

[0068] The residual monomer contents were measured according to DIN EN ISO 10283:2007-11 using gas chromatography with an internal standard.

[0069] OH numbers were determined titrimetrically according to DIN 53240-2:2007-11, and acid numbers according to DIN EN ISO 2114:2002-06. The stated OH contents were calculated from the analytically determined OH numbers. The stated values ​​refer to the total weight of the respective composition, including any solvents used.

[0070] To determine the pot life, the skin formation time of the moisture-curing STP was used, not by doubling the flow times, which are usually determined according to DIN EN ISO 2431:2011-11 ("Determination of flow time using flow cups"). By periodically touching the film surface with the end of a wooden spatula, the time at which the spatula tip could pull the adhering skin away from the surface was determined.

[0071] The drying times (T1, T3 and T4) were determined according to DIN EN ISO 9117-5:2010-07 (Drying test Part 5: Modified Bandow-Wolff method).

[0072] Solvent and water resistance were determined according to DIN EN ISO 4628-1:2016-07. The solvent resistance tests used were xylene (hereinafter also abbreviated as "Xy"), methoxypropyl acetate (hereinafter also abbreviated as "MPA"), ethyl acetate (hereinafter also abbreviated as "EA"), and acetone (hereinafter also abbreviated as "Ac"). The contact time was 5 minutes in each case. For the water resistance test, the contact time was 24 hours in each case. Sampling was carried out according to the specified standard. The test surface is assessed visually and by scratching, with the following classification: 0 = No detectable change; 1 = Swelling ring, hard surface, only visible change; 2 = Swelling ring, slight softening; 3 = Significant softening (possibly slight blistering); 4 = Severe softening (possibly severe blistering), scratchable down to the substrate. 5 = Coating completely destroyed without external influence.

[0073] The pendulum damping was determined according to the König method on glass plates according to DIN EN ISO 1522:2007-04. The described STP films were applied to the glass plates using a doctor blade. The dry film thickness for all films was 35-40 µm.

[0074] All described STP films were applied to glass plates using a doctor blade. The film thickness for all films was 35-40 µm. List of trade names and abbreviations

[0075] Borchi Kat 22 (zinc carboxylate-based catalyst, 100%) was purchased from Borchers.

[0076] Setalux DA HS 1170 BA (OH content 3.6%, solid content 70%, viscosity 1200 mPa s) and Setalux DA 870 BA (OH content 3.6%, solid content 70%, viscosity 1200 mPa s) polyacrylate from Allnex.

[0077] Stabaxol 1, tetraisopropyldiphenylcarbodiimide, from RheinChemie. Methoxypropyl acetate (MPA), butyl acetate (BA), ethyl acetate (EA), acetone (Ac), and xylene (Xy) were purchased from Azelis.

[0078] Hexamethylene diisocyanate (HDI), Desmodur XP 2565 (IPDI allophanate, 80% solids, NCO content 12%, viscosity 2,800 mPa s) was purchased from Covestro.

[0079] Dibutyltin dilaurate (DBTL) was purchased from RheinChemie, available under the trade name Addocat 201 40P. Mercaptopropyltrimethoxysilane, orthophosphoric acid, tetraethylorthoformate (TEOF), aminopropyltriethoxysilane, and diethyl maleate were purchased from Sigma-Aldrich.

[0080] Flow agents such as BYK-141 and BYK-311 were purchased from BYK Additives & Instruments.

[0081] Sunscreens such as Tinuvin 292 and Tinuvin 1130 were purchased from BASF.

[0082] Black basecoat (Permahyd ®< , Base Coat 280) was used by Spiess Hecker.

[0083] All reagents and chemicals were used without further purification. Synthesis of crosslinking raw materials Production example 1

[0084] 934 g of HDI were placed in a glass reactor and mixed with 1.3 g of Borchi Kat 22. 364 g of 3-mercaptopropyltrimethoxysilane were then added dropwise. The reaction solution was stirred until an NCO content of 24 wt.% was reached. After adding orthophosphoric acid (20 wt.% in i-PrOH), the unreacted monomeric HDI was separated by two-stage thin-film distillation at a temperature of 130 °C and a pressure of 0.1 mbar. NCO = 11,2 % Solid content = 100% by weight Viscosity = 515 mPa s Production example 2

[0085] 478.03 g of the compounds obtained from Preparation Example 1, 15.02 g of TEOF, and 10 drops of DBTL are treated with 764.91 g of 2-Setalux DA HS 1170 BA and 38.83 g of Stabaxol 1 at 80 °C under dry nitrogen. The reaction is stirred until a residual NCO content of < 0.3% is reached. 203.21 g of BuAc is added to the crude product. A virtually colorless, clear silane is obtained. NCO residual content: 0,26 % Viscosity (23 °C): 723 mPa s Solids: 70% Production example 3

[0086] The HDI polyisocyanate used here was prepared according to Example 11 of EP-A 330 966. The reaction was stopped by adding dibutyl phosphate at an NCO content of the crude product of 40%. Unreacted HDI was then removed by thin-film evaporation at a temperature of 130 °C and a pressure of 0.2 mbar. A product with the following properties was obtained. NCO content: 21,8% Viscosity (23 °C): 3000 mPa s Solid content = 100% by weight Monomeric HDI: 0,1% Resin formulations Example 4 (comparison example)

[0087] 47.4 g of Setalux DA 870 BA was mixed with 0.25 g of BYK-141, 1.48 g of BYK-311, 0.99 g of Tinuvin 292, 1.97 g of Tinuvin 1130, 3 g of Addocat 201, and 20.33 g of a 1:1:1 mixture of butyl acetate / MPA / xylene. After adding a mixture of 15.91 g of Preparation Example 3 and 8.72 g of butyl acetate / xylene (1:1), the mixture was coated over a black basecoat (Spiess Hecker, Permahyd®, Base Coat 280) and cured at 60 °C for 30 minutes. Example 5

[0088] 40.61 g of Setalux DA 870 BA was mixed with 0.21 g of BYK-141, 1.27 g of BYK-311, 0.84 g of Tinuvin 292, 1.69 g of Tinuvin 1130, 2.57 g of Addocat 201, and 21.42 g of a butyl acetate / MPA / xylene (1:1:1) mixture. After adding a mixture of 13.63 g of Preparation Example 3, 14.29 g of the compound from Preparation Example 2, and 7.47 g of butyl acetate / xylene (1:1), the mixture was coated over a black basecoat (Spiess Hecker, Permahyd®, Base Coat 280) and cured at 60°C for 30 minutes. Application examples

[0089] Surprisingly, it was observed that the addition of STPs to 2K PU coating formulations can extend pot life. To increase pot life by between 40% and 70%, the addition of 10 wt.% of an STP with different structures is sufficient (Table 1). This can increase the processing time of a 2K PU formulation. In addition, improved scratch resistance with the same gloss retention under weathering conditions is observed ( vide infra ) . Table 1: Pot life extension of 2-component PU systems compared to STP-containing 2-component PU formulations. Catalyst: DBTL (0.1 wt%) used. Doubling of viscosity at room temperature. Nr. Pot life (h) 1 2K PU (comparison example 4) 1,5 2 2K PU + 10% STP (Example 5) 2,4

[0090] The addition of 10 wt.% of an STP (based on the solids) had a minor influence on the pendulum hardness of the coating film (Table 2). The solvent resistance of the various STP-added 2K PU coating films corresponded to those of the reference system (No. 1). The gloss values ​​(60 °C) provided comparable values ​​to the reference system. It was observed that the scratch resistance of the coating systems can be improved by adding an STP. Table 2: Pendulum hardness Solvent resistance (Xy / MPA / EA / Ac)* Scratch resistance zero value Scratch resistance final value (s) Gloss measurement (60°) Gloss measurement (60°) Comparison example 4 159 0135 91,2 48,9 Example 5 115 0235 91,0 60,5 *Xy = xylene, MPA = methoxypropyl acetate, EA = ethyl acetate, Ac = acetone

[0091] The addition of STPs to extend the pot life of a 2K PU formulation has no effect on weathering resistance, as the STP-containing clearcoats show no changes over a period of 1000 hours in the CAM 180 test. This finding is confirmed by gloss measurements at different angles before and after the weathering period. Table 3: Weathering study (CAM 180) after 1000 h visual inspection Gloss measurement Gloss measurement (1000 h) 0 h 1000 h (20° / 60°) (20° / 60°) Comparison example 4 no change 92 / 94 91 / 95 Example 5 no change 91 / 93 91 / 94

Claims

1. 2-Component system comprising or consisting of a first component, which comprises or consists of A1) at least one compound having at least one Zerewitinoff-active group; B1) optionally at least one catalyst; C1) optionally at least one solvent; and D1) optionally at least one additive, and a second component, which comprises or consists of A2) at least one polyisocyanate; and B2) at least one of the following compounds of the formula (I): in which R1 to R3 each independently of one another are identical or different saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals which have up to 18 carbon atoms and may optionally contain up to 3 heteroatoms from the group of oxygen, sulfur, nitrogen, with the proviso that at least one of the radicals R1, R2 and R3 is joined to the silicon atom via an oxygen atom, X independently at each instance is identical or different, saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals which have up to 6 carbon atoms; Y independently at each instance are identical or different, saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals which have up to 18 carbon atoms and may optionally contain up to 3 heteroatoms from the group of oxygen, sulfur, nitrogen; and Z is a structural unit which is derived from an at least difunctional polyol having a number-average molecular weight Mn of 270 to 22 000 g / mol; or is a polyhydric alcohol and / or ether alcohol or ester alcohol containing 2 to 14 carbon atoms; C2) optionally at least one solvent; D2) optionally at least one compound which differs from the compound of formula (I) and is obtained by reacting at least one isocyanate group with a secondary amine containing a silane group.

2. 2-Component system according to Claim 1, characterized in that the at least one compound A1 is selected from polyols, polyamines, polyether polyols, polyester polyols, polyurethane polyols, polysiloxane polyols, polycarbonate polyols, polyether polyamines, polybutadiene polyols, polyacrylate polyols and polymethacrylate polyols and copolymers thereof.

3. 2-Component system according to Claim 1 or 2, characterized in that the at least one catalyst B1 is selected from the class of tin catalysts, bismuth catalysts, zinc catalysts, zirconium catalysts and amine bases.

4. 2-Component system according to one of the preceding claims, characterized in that the at least one solvent C1 is selected from aromatic solvents and aliphatic solvents, and mixtures thereof.

5. 2-Component system according to one of the preceding claims, characterized in that the at least one additive D1 is selected from UV stabilizers, antioxidants and leveling agents, or mixtures thereof.

6. 2-Component system according to one of the preceding claims, characterized in that the at least one polyisocyanate A2 is selected from di- or triisocyanates, such as butane 1,4-diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, 4-isocyanatomethyloctane 1,8-diisocyanate, 4,4'-methylenebis(cyclohexyl isocyanate), decamethylene 1,10-diisocyanate, 3,5,5-trimethyl-1-isocyanato-3-isocyanatomethylcyclohexane, 1,3- and 1,4-bis(isocyanatomethyl)cyclohexane, isophorone diisocyanate, naphthalene 1,5-diisocyanate, diisocyanatodiphenylmethane, such as 2,2'-, 2,4'- and 4,4'-MDI or mixtures thereof, diisocyanatomethylbenzene, such as tolylene 2,4- and 2,6-diisocyanate, and technical grade mixtures of the two isomers, and 1,3- and / or 1,4-bis(isocyanatomethyl)benzene, 3,3'-dimethyl-4,4'-biphenyl diisocyanate, paraphenylene 1,4-diisocyanate and cyclohexyl diisocyanate and the oligomers of higher molecular weight which are obtainable individually or in a mixture from the above and have biuret, uretdione, isocyanurate, iminooxadiazinedione, allophanate, urethane and carbodiimide / uretonimine structural units.

7. 2-Component system according to one of the preceding claims, characterized in that D2 is selected from i) at least one compound of the formula (II) in which R1, R2 and R3 each independently of one another are identical or different saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals which have up to 18 carbon atoms and may optionally contain up to 3 heteroatoms from the group of oxygen, sulfur, nitrogen, with the proviso that at least one of the radicals R1, R2 and R3 is joined to the silicon atom via an oxygen atom, X is a linear or branched organic radical having up to 6 carbon atoms and Y is a linear or branched, aliphatic or cycloaliphatic radical having 4 to 18 carbon atoms, W independently at each instance are a formyl or acetyl group or else a COO group having a radical G; G in this case may be mono-, di-, tri- or tetrafunctional and is a linear or branched, aliphatic or cycloaliphatic radical or a connecting unit derived therefrom having 4 to 18 carbon atoms or an optionally substituted aromatic or araliphatic radical, and / or ii) at least one compound of the formula (III) in which X independently at each instance is selected from alkoxy or alkyl radicals, or two radicals X together with the silicon atom to which they are bonded form an Si-substituted hydrocarbon ring, each having up to 10 carbon atoms, with the proviso that the Si atom has at least one alkoxy radical, Q is a difunctional linear or branched aliphatic radical having up to 10 carbon atoms; and Z at each instance is an alkoxy radical having 1 to 10 carbon atoms.

8. 2-Component system according to one of the preceding claims, characterized in that B2 preferably has an isocyanate content of less than 2%.

9. 2-Component system according to one of the preceding claims, characterized in that the constituents of the first component parts by weight of A1 and parts by weight of B1 are present in a weight ratio of 0.5 to 8 in relation to the constituent parts by weight of C1 and parts by weight of D1.

10. 2-Component system according to one of the preceding claims, characterized in that the constituents of the second component parts by weight of A2 and parts by weight of B2 are present in a weight ratio of 0.5 to 10 to the constituents parts by weight of C2 and parts by weight of D2.

11. 2-Component system according to one of the preceding claims, characterized in that the constituents of the first component parts by weight of A1, and optionally parts by weight of B1, parts by weight of C1 and parts by weight of D1, are present in a weight ratio of 0.6 to 11 to the constituents of the second component, parts by weight of A2, parts by weight of B2 and optionally parts by weight of C2 and parts by weight of D2.

12. Process for preparing silicon-containing polyurethanes, comprising reacting the first component with the second component of the 2-component system according to one of Claims 1 to 11.

13. Silicon-containing polyurethanes obtainable by the process according to Claim 12.

14. Use of the 2-component system according to one of Claims 1 to 11 for the production of coating, sealants or adhesives.