EP4326794A1 - Composition à deux composants à durcissement rapide de polymères silylés à longue durée d'ouverture - Google Patents

Composition à deux composants à durcissement rapide de polymères silylés à longue durée d'ouverture

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Publication number
EP4326794A1
EP4326794A1 EP22722268.4A EP22722268A EP4326794A1 EP 4326794 A1 EP4326794 A1 EP 4326794A1 EP 22722268 A EP22722268 A EP 22722268A EP 4326794 A1 EP4326794 A1 EP 4326794A1
Authority
EP
European Patent Office
Prior art keywords
component
weight
ligands
groups
silane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22722268.4A
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German (de)
English (en)
Inventor
Klaas Mennecke
Riccardo SUTER
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Sika Technology AG
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Sika Technology AG
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Publication date
Application filed by Sika Technology AG filed Critical Sika Technology AG
Publication of EP4326794A1 publication Critical patent/EP4326794A1/fr
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4825—Polyethers containing two hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
    • C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
    • C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
    • C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
    • C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/54—Silicon-containing compounds
    • C08K5/541—Silicon-containing compounds containing oxygen
    • C08K5/5425—Silicon-containing compounds containing oxygen containing at least one C=C bond
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/54—Silicon-containing compounds
    • C08K5/544—Silicon-containing compounds containing nitrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/56—Organo-metallic compounds, i.e. organic compounds containing a metal-to-carbon bond
    • C08K5/57—Organo-tin compounds
    • C08K5/58—Organo-tin compounds containing sulfur
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00—Compositions of unspecified macromolecular compounds
    • C08L101/02—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
    • C08L101/10—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing hydrolysable silane groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
    • C08L75/04—Polyurethanes
    • C08L75/08—Polyurethanes from polyethers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C09D175/08—Polyurethanes from polyethers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D201/00—Coating compositions based on unspecified macromolecular compounds
    • C09D201/02—Coating compositions based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
    • C09D201/10—Coating compositions based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing hydrolysable silane groups
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • C09J175/08—Polyurethanes from polyethers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • C09J201/02—Adhesives based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
    • C09J201/10—Adhesives based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing hydrolysable silane groups

Definitions

  • the present invention relates to the field of two-component curable compositions based on organic polymers containing silane groups and their use, in particular as adhesives.
  • compositions based on organic polymers containing silane groups have been known for a long time and are used in many different ways. On contact with water or atmospheric moisture, these compositions are already able at room temperature to condense with one another with hydrolytic elimination of reactive groups on the silane groups, mostly alkoxy groups, and simultaneous formation of silanoics.
  • adhesives based on organic polymers containing silane groups in the cured state not only have very good adhesion properties on a wide variety of substrates, but also very good mechanical properties, since they can be both tear-resistant and highly elastic.
  • Another frequently mentioned advantage of silane-crosslinking systems compared to numerous other adhesive and sealant technologies eg compared to isocyanate-crosslinking systems
  • isocyanate-crosslinking systems is the largely toxicological harmlessness of such polymers.
  • one-component systems (1-component systems) are preferred, which only cure through contact with the diffusing humidity.
  • 2K systems two-component systems based on organic polymers containing silane groups, which consist of two components that are mixed before or during application.
  • the reactive components containing silane groups such as polymers containing silane groups and organosilanes
  • the second component contains water and any auxiliary substances.
  • the reactive components containing silane groups then come into contact with the water in a homogeneous manner, which enables rapid, uniform curing regardless of the atmospheric humidity.
  • the two-component systems taught in these documents of the prior art comprise a first component which, in addition to the organic polymers containing silane groups, contains, for example, plasticizers, fillers, tin catalysts and other customary additives such as stabilizers.
  • the second component of the two-component system is usually a paste-like, water-based mixture which, in addition to water, typically contains chalk, thickeners and, if necessary, other components such as plasticizers.
  • a particular disadvantage of these two-component systems of the prior art is that a compromise always has to be made between curing speed and processing time (pot life or open time) of the mixed composition.
  • the object of the present invention is therefore to provide a two-component composition based on polymers containing silane groups, which overcomes the disadvantages of the prior art and has a long pot life and cures very quickly after the end of the pot life and has good mechanical properties after curing. It has surprisingly been found that two-component compositions according to claim 1 solve this problem.
  • two-component compositions based on polymers containing silane groups can be provided which have a long pot life and which can be used in widely definable mixing ratios of the two components.
  • the two-component compositions according to the invention have a robust mixing profile, ie they can be used with widely selectable mixing ratios of component A and component B.
  • the two-component compositions according to the invention have exceptionally good storage stability.
  • the inventive two-component Compositions exhibit consistent pot life regardless of catalyst concentration, further increasing mix ratio flexibility. Compared to the prior art, the compositions according to the invention exhibit at least the same or even better mechanical properties and they have very good adhesion to various substrates.
  • the present invention relates to a two-component composition consisting of a component A comprising i) at least one organic silane-containing polymer STP; ii) preferably at least one drying agent; iii) preferably at least one amine AM having at least one free amino group or one latent amino group which can be released via hydrolysis; iv) optionally at least one hydrolyzable silane OS that does not have an amino group; and v) at least one catalyst K for the crosslinking of silane-functional polymers; and a component B comprising i) between 1 and 75% by weight of water, based on component B, the water preferably being present in dispersed form in a mixture with filler and/or plasticizer and optionally further additives; and optionally in component A and/or component B other additives selected from the group consisting of fillers, hydrophilic or hydrophobic silicas, plasticizers, solvents, rheological additives, surfactants, pigments, emulsifiers, UV or oxidation
  • Catalyst K is a tin complex with two mercaptide ligands according to formula (V), where ligands L 1 are independently sulfur-coordinated alkyl mercaptides, in particular C ⁇ to C16 alkyl mercaptides, where ligands L 1 optionally methyldialkoxysila groups are preferred
  • silane group designates a silyl group bonded to an organic radical with one to three, in particular two or three, hydrolyzable radicals on the silicon atom.
  • the hydrolyzable radicals are, for example, alkoxy, acetoxy, ketoximato, amido or enoxy radicals.
  • Silane groups with alkoxy radicals are also referred to as “alkoxysilane groups”.
  • silane designates an organic compound which has at least one silane group.
  • Epoxysilane, "hydroxysilane”, “(meth)acrylate silane”, “isocyanatosilane”, “aminosilane” or “mercaptosilane” are silanes which, in addition to the silane group, have one or more epoxy, hydroxyl, (meth ) acrylate, isocyanato, amino or mercapto groups.
  • Aminosilanes which have a primary amino group, ie an NFte group which is bonded to an organic radical are referred to as "primary aminosilanes”.
  • Aminosilanes which have a secondary amino group, ie an NH group which is bonded to two organic radicals are referred to as "secondary aminosilanes”.
  • a silicon-containing organic compound with at least one Si—H bond is referred to as “hydrosilane”.
  • the silane equivalent weight is given in g/equivalent or g/eq and can be calculated from the silicon content of a polymer containing silane groups, determined by measurement in inductively coupled plasma (ICP).
  • An NH2 group or its nitrogen atom, which is bonded to an organic radical is referred to as a “primary amino group” or “primary amine nitrogen”, and as a “secondary amino group” or “secondary amine nitrogen” denotes an NH group or its nitrogen atom, which is bonded to two organic radicals, which can also be part of a ring together, and an N- Group or the nitrogen atom referred to, which is bonded to three organic radicals, which can also be two or three parts of one or more rings.
  • a heteroatom is any heteroatom customary in organic chemistry, e.g. 0, N or S.
  • (Meth)acrylate means methacrylate or acrylate.
  • polymer includes, on the one hand, a group of macromolecules that are chemically the same but differ in terms of degree of polymerisation, molar mass and chain length and which were produced by a polyreaction (polymerisation, polyaddition, polycondensation).
  • the term also includes derivatives of such a collective of macromolecules from polyreactions, i.e. compounds which are obtained by reactions, such as additions or substitutions, of functional groups on given macromolecules and which can be chemically uniform or chemically heterogeneous.
  • the term also includes what are known as prepolymers, ie reactive oligomeric pre-adducts whose functional groups are involved in the construction of macromolecules.
  • a "prepolymer” is a polymer with functional groups that serves as a precursor to the formation of a higher molecular weight polymer.
  • organic polymer includes a group of macromolecules that are chemically uniform but differ in terms of degree of polymerisation, molar mass and chain length and are therefore polydisperse, which were produced by a polyreaction (polymerisation, polyaddition, polycondensation) and have mostly carbon atoms in the polymer backbone has, and reaction products of such a collective of macromolecules.
  • Polymers with a polyorganosiloxane backbone commonly referred to as "silicones” are not organic polymers as defined in this document.
  • polymer containing silane groups as described in this document is always an organic polymer containing silane groups with hydrolysis-reactive silane groups as defined above. This term is understood synonymously with the term "silane-functional polymer”.
  • polymer containing silane groups thus refers to an organic compound bearing at least one silane group, which has a linear or branched polymer chain comprising at least three connected, identical or different structural units, which are based on polymerizable monomers, such as alkylene oxides, (meth)acrylates or olefins.
  • the polymer chain can also contain functional groups, e.g. urethane groups and/or urea groups.
  • molecular weight means the defined and discrete molar mass (in grams per mole) of a molecule or part of a molecule, also referred to as the "remainder”.
  • Molecular weight means the number average M n of a particular polydisperse oligomeric or polymeric mixture of molecules or residues, which is usually determined by means of gel permeation chromatography (GPC) against polystyrene as a standard.
  • a one-part composition includes all of the ingredients in one part.
  • a multi-component or two-component composition comprises two or more components, with some of the components being contained in a first component and the other part of the components being contained in a second component or, if more than two components are present, in several other components, where the components are stored separately from each other.
  • the individual components are usually mixed together shortly before use.
  • a substance or a composition is described as “stable in storage” or “storable” if it can be stored at room temperature in a suitable container for a longer period of time, typically at least 6 months up to 9 months and more, without it being in their application or usage properties, in particular the viscosity and the crosslinking rate, are changed by storage to an extent relevant to their use.
  • pot life or synonymously “open time” is understood to mean the processing time of reactive compositions after their application. In most cases, the end of the pot life is associated with such an increase in the viscosity of the composition that it is no longer possible to process the composition properly.
  • a dashed line in the formulas in this document represents the bond between a substituent and the associated residue of the molecule.
  • a temperature of approx. 23°C is referred to as “room temperature”.
  • weight percent denotes a percentage Mass fraction which, unless otherwise stated, refers to the mass (weight) of the entire composition or, depending on the context, of the entire molecule.
  • the first component A of the two-component composition contains at least one organic polymer STP containing silane groups; preferably at least one drying agent; preferably at least one amine AM having at least one free amino group or one latent amino group which can be released via hydrolysis; optionally at least one hydrolyzable silane that does not have an amino group; and at least one catalyst K for the crosslinking of silane-functional polymers.
  • the composition comprises at least one polymer STP containing silane groups.
  • the silane groups can be lateral in the chain or terminal.
  • the polymer containing silane groups can have one or more urethane or urea bonds in the polymer chain, as well as other organic residues which arise, for example, from the reaction of polyols with diisocyanates.
  • Polyethers containing silane groups, poly(meth)acrylates, polyolefins, polyesters, polyamides, polyurethanes or mixed forms of these polymers are preferred as the polymer STP containing silane groups.
  • Particularly preferred are silane groups containing polyethers, poly(meth)acrylates, polyolefins and polyesters, in particular polyethers containing silane groups and poly(meth)acrylates.
  • Polyethers containing silane groups are most preferred. In all of these polymers, the silane groups are preferably alkoxysilane groups.
  • the polymer STP containing silane groups comprises a polyether containing silane groups or consists of at least one polyether containing silane groups.
  • a "polyether containing silane groups” is understood to mean a polymer containing silane groups, the polymer backbone of which consists predominantly of polyether units, but also having one or more urethane, thiourethane, ester, amide and/or urea bonds, preferably urethane and/or urea bonds can be contained in the polymer chain, as well as other organic residues which arise, for example, from the reaction of polyols with diisocyanates for chain extension or those which originate from the synthetic attachment of the silane groups to the polymer.
  • the polyether containing silane groups contains oxyalkylene units, preferably oxy(C.sub.2-C.sub.4-alkylene) units, such as oxyethylene, oxypropylene or oxybutylene units, as structural units in the polymer chain, with oxypropylene units being particularly preferred.
  • the polymer chain may contain one type of oxyalkylene unit or a combination of two or more different oxyalkylene units, which may be random or preferably block.
  • the polyether containing silane groups preferably has a majority of oxyalkylene units, in particular 1,2-oxypropylene units, in the polymer backbone.
  • the polymer STP containing silane groups is preferably liquid at room temperature.
  • One or more polymers STP containing silane groups, in particular polyethers containing silane groups can be used.
  • the polymer STP containing silane groups, in particular the polyether containing silane groups contains at least one, preferably at least two, silane group(s).
  • the polymer STP containing silane groups, in particular the polyether containing silane groups has on average in particular more than 1, preferably 1.3 to 4, preferably 1.5 to 3, particularly preferably 1.7 to 2.8 silane groups per molecule.
  • the silane groups are preferably terminal.
  • the silane groups of the polymer STP containing silane groups, in particular of the polyether containing silane groups, and preferably of the silanes also present in the composition, preferably have two or three, particularly preferably three, hydrolyzable radicals on the silicon atom.
  • the hydrolyzable groups can be the same or different; preferably they are the same.
  • the hydrolyzable radicals of all the silane groups present in the composition are, in particular, alkoxy, acetoxy, ketoximato, amido or enoxy radicals having 1 to 13 carbon atoms.
  • Alkoxy radicals are preferred.
  • Preferred alkoxy radicals have 1 to 4 carbon atoms.
  • Methoxy and ethoxy radicals are particularly preferred.
  • silane groups of the polymer STP containing silane groups in particular of the polyether containing silane groups, and preferably of the silanes also contained in the composition, are therefore preferred
  • Alkoxysilane groups in particular dialkoxysilane groups and particularly preferably trialkoxysilane groups. Dimethoxysilane groups and diethoxysilane groups are also preferred.
  • Preferred silane groups of the polymers STP containing silane groups, in particular the polyethers containing silane groups, and preferably the silanes also present in the composition, are in particular trimethoxysilane groups, dimethoxymethylsilane groups or triethoxysilane groups and particularly preferably trimethoxysilane groups and triethoxysilane groups.
  • the polymer STP containing silane groups is preferably obtainable from - the copolymerization of (meth)acrylic silanes with non-silane-functional (meth)acrylates and/or olefins, or
  • the polymer STP containing silane groups is particularly preferably obtainable from the reaction of NCO prepolymers with aminosilanes or hydroxysilanes or mercaptosilanes.
  • Suitable NCO prepolymers are obtainable in particular from the reaction of polyols with polyisocyanates, in particular diisocyanates.
  • the reaction can take place in that the polyol and the polyisocyanate are reacted using customary methods, in particular at temperatures from 50° C. to 100° C., optionally with the concomitant use of suitable catalysts, in particular amines, bismuth or zinc compounds the polyisocyanate is dosed in such a way that its isocyanate groups are present in a stoichiometric excess in relation to the hydroxyl groups of the polyol.
  • the excess of polyisocyanate is chosen such that the resulting polyurethane polymer has a content of free isocyanate groups of 0.1 after the reaction of all the hydroxyl groups of the polyol to 5% by weight, preferably 0.2 to 3% by weight, based on the total NCO prepolymer.
  • polyols in particular polyether polyols, polyester polyols, polycarbonate polyols, poly(meth)acrylate polyols and polyolefin polyols and mixed forms thereof, are suitable as polyols for the production of the NCO prepolymer.
  • polyols small amounts of low molecular weight dihydric or polyhydric alcohols can also be used.
  • HDI 1,6-hexamethylene diisocyanate
  • IPDI isophorone diisocyanate
  • HMDI Perhydro-2,4'- and -4,4'-diphenylmethane diisocyanate
  • TDI 2,4- and 2,6- tolylene diisocyanate and any mixtures of these isomers
  • MDI 4,4'-, 2,4 '- And 2,2'-diphenylmethane diisocyanate and any mixtures of these isomers
  • MDI mixtures of these polyisocyanates.
  • the reaction of the NCO prepolymer with the aminosilane or hydroxysilane or mercaptosilane is preferably carried out in such a way that the amino or hydroxyl or mercapto groups of the silane are present at least stoichiometrically in relation to the isocyanate groups of the NCO prepolymer.
  • the resulting polymer STP containing silane groups is free of isocyanate groups, which is advantageous from a toxicological point of view.
  • the reaction preferably takes place at a temperature in the range from 20.degree. C. to 120.degree. C., in particular from 40.degree. C. to 100.degree.
  • Suitable aminosilanes for converting the NCO prepolymer are primary and secondary aminosilanes.
  • Secondary aminosilanes are preferred, in particular N-butyl-(3-aminopropyl)trimethoxysilane and N-ethyl-(3-amino-2-methylpropyl)trimethoxysilane and adducts of primary aminosilanes, in particular 3-aminopropyltrimethoxysilane and N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, and Michael acceptors, in particular acrylates and maleic diesters, and their analogs with ethoxy instead of methoxy groups.
  • Particularly preferred aminosilanes are the adducts of 3-aminopropyltrimethoxysilane or 3-aminopropyltriethoxysilane and diethyl maleate.
  • Suitable hydroxysilanes for converting the NCO prepolymer are, in particular, hydroxysilanes which have a secondary hydroxyl group. Hydroxysilanes are preferably obtainable from
  • Suitable mercaptosilanes for converting the NCO prepolymer are, in particular, 3-mercaptopropylsilanes, preferably 3-mercaptopropyltrimethoxysilane and 3-mercaptopropyltriethoxysilane.
  • Suitable commercially available polymers containing silane groups are available, for example, under the brand names EPION® (from Kaneka; polyisobutylene containing silane groups), XMAPTM (from Kaneka, types SA100S, SA310S, SA420S; poly(meth)acrylate containing silane groups), GemlacTM ( from Kaneka; poly(meth)acrylate silicone containing silane groups), Vestoplast® (from Evonik, types 206, EP2403, EP2412; amorphous poly-alpha-olefin containing silane groups) and the polyethers containing alkoxysilane groups mentioned below.
  • EPION® from Kaneka; polyisobutylene containing silane groups
  • XMAPTM from Kaneka, types SA100S, SA310S, SA420S
  • GemlacTM from Kaneka; poly(meth)acrylate silicone containing silane groups
  • Vestoplast® from Evonik, types 206, EP2403, EP2412; amorphous poly-
  • the polymer STP containing silane groups, in particular the polyether containing silane groups preferably has an average molecular weight, determined by GPC compared to the polystyrene standard, in the range from 1000 to 30000 g/mol, in particular from 2000 to 20000 g/mol.
  • the polymer STP containing silane groups, in particular the polyether containing silane groups preferably has a silane equivalent weight of from 300 to 25000 g/eq, in particular from 500 to 15000 g/eq.
  • the polymer STP containing silane groups in particular the polyether containing silane groups, preferably contains end groups of the formula (II), where p is 0 or 1 or 2, preferably 0 or 1, in particular 0, R 4 is a linear or branched, monovalent hydrocarbon radical having 1 to 5 carbon atoms,
  • R 5 is a linear or branched, monovalent hydrocarbon radical having 1 to 8 carbon atoms, in particular methyl or ethyl,
  • R 6 is a linear or branched, divalent hydrocarbon radical having 1 to 12 carbon atoms, which may be cyclic and / or aromatic
  • Moieties and optionally one or more heteroatoms, in particular one or more nitrogen atoms, has,
  • X is a divalent radical selected from --O-, --S-, --N(R 7 )-,
  • R 7 is a hydrogen atom or a linear or branched hydrocarbon radical having 1 to 20 carbon atoms, which optionally has cyclic moieties and which optionally has an alkoxysilyl group or ether or carboxylic acid ester groups, and R 8 is unbranched Alkyl radical having 1 to 6 carbon atoms, in particular special methyl.
  • R 4 is preferably methyl or ethyl or isopropyl.
  • R 4 is particularly preferably methyl.
  • Such silane-containing polymers STP are particularly reactive.
  • R 4 is ethyl.
  • silane group-containing polymers STP are particularly stable in storage and are toxicologically advantageous.
  • R 5 is preferably methyl.
  • R 6 is preferably 1,3-propylene or 1,4-butylene, where butylene can be substituted by one or two methyl groups.
  • R 6 is particularly preferably 1,3-propylene. Processes for preparing polyethers containing silane groups are known to those skilled in the art.
  • polyethers containing silane groups can be obtained from the reaction of polyethers containing allyl groups with hydrosilanes (hydrosilylation), optionally with chain lengthening using, for example, diisocyanates.
  • polyethers containing silane groups can be obtained from the copolymerization of alkylene oxides and epoxysilanes, optionally with chain extension using, for example, diisocyanates.
  • polyethers containing silane groups can be obtained from the reaction of polyetherpolyols with isocyanatosilanes, optionally with chain lengthening with diisocyanates.
  • polyethers containing silane groups can be obtained from the reaction of polyethers containing isocyanate groups, in particular NCO-terminated urethane polyethers from the reaction of polyetherpolyoils with a superstoichiometric amount of polyisocyanates, with aminosilanes, hydroxysilanes or mercaptosilanes.
  • Polyethers containing silane groups from this process are particularly preferred. This process enables the use of a large number of commercially readily available, inexpensive starting materials, with which different polymer properties can be obtained, for example high ductility, high strength, a low glass transition temperature or high resistance to hydrolysis.
  • Preferred polyethers containing silane groups are obtainable from the reaction of NCO-terminated urethane polyethers with aminosilanes or hydroxysilanes.
  • NCO-terminated urethane polyethers suitable for this are obtainable from the reaction of polyether polyols, in particular polyoxyalkylene diols or polyoxyalkylene triols, preferably polyoxypropylene diols or polyoxypropylene triols, with a superstoichiometric amount of polyisocyanates, in particular diisocyanates.
  • the reaction between the polyisocyanate and the polyether polyol is preferably carried out with exclusion of moisture at a temperature of 50° C. to 160° C., if appropriate in the presence of suitable catalysts, the polyisocyanate being dosed in such a way that its isocyanate groups are proportionate to the hydroxyl groups of the polyol are present in stoichiometric excess.
  • the excess of polyisocyanate is selected so that the resulting urethane polyether after the reaction of all hydroxyl groups has a content of free isocyanate groups in the range from 0.1 to 10% by weight, preferably 0.2 to 5% by weight, particularly preferably 0.3 to 3% by weight based on the total polymer remains.
  • IPDI or TDI are particularly preferred. Most preferred is IPDI. This gives the silane-containing polyethers with particularly good lightfastness.
  • polyether polyols Particularly suitable as polyether polyols are polyoxyalkylene diols or polyoxyalkylene triols with a degree of unsaturation lower than 0.02 meq/g, in particular lower than 0.01 meq/g, and an average molecular weight in the range from 400 to 2500 g/mol, in particular 1000 to 2000 g/mol .
  • proportions of other polyols can also be used, in particular polyacrylate polyols or polyester polyols, and also low molecular weight diols or triols.
  • Suitable aminosilanes for the reaction with an NCO-terminated urethane polyether are primary or secondary aminosilanes.
  • Suitable hydroxysilanes for the reaction with an NCO-terminated urethane polyether can be obtained in particular from the addition of aminosilanes to lactones, lactides or to cyclic carbonates.
  • Preferred hydroxysilanes of this type are N-(3-triethoxysilylpropyl)-2-hydroxypropanamide, N-(3-trimethoxysilylpropyl)-2-hydroxypropanamide, N-(3-triethoxysilylpropyl)-4-hydroxypentanamide, N-(3- triethoxysilylpropyl)-4-hydroxyoctanamide, N-(3-triethoxysilylpropyl)-5-hydroxydecanamide or N-(3-triethoxysilylpropyl)-2-hydroxypropyl carbamate.
  • hydroxysilanes are obtainable from the addition of aminosilanes to epoxides or from the addition of amines to epoxysilanes.
  • Preferred hydroxysilanes of this type are 2-morpholino-4(5)-(2-trimethoxysilylethyl)cyclohexan-1-ol, 2-morpholino-4(5)-(2-triethoxysilylethyl)cyclohexan-1-ol or 1-morpholino -3-(3-(triethoxysilyl)propoxy)propan-2-ol.
  • polyethers containing silane groups are also suitable as polyethers containing silane groups, in particular the following: MS PolymerTM (from Kaneka Corp., in particular the types S203H, S303H, S227, S810, MA903 and S943), MS Po lymerTM or SilylTM (from Kaneka Corp., specifically the types SAT010, SAT030, SAT200, SAX350, SAX400, SAX725, MAX450, MAX951), Excestar ® (from Asahi Glass Co.
  • MS PolymerTM from Kaneka Corp., in particular the types S203H, S303H, S227, S810, MA903 and S943
  • MS Po lymerTM or SilylTM from Kaneka Corp., specifically the types SAT010, SAT030, SAT200, SAX350, SAX400, SAX725, MAX450, MAX951
  • Excestar ® from Asahi Glass Co.
  • the composition preferably has a content of polymer STP containing silane groups in the range from 5 to 80% by weight, particularly preferably in the range from 10 to 75% by weight, in particular in the range from 15 to 70% by weight.
  • composition according to the invention can preferably also comprise at least one desiccant in component A.
  • a drying agent stabilizes component A against premature, unwanted hardening, for example in the container, and is recommended if the components of component A cannot be dried sufficiently beforehand. This stabilizing effect is based on the fact that unintentionally present water is bound and/or reacted by the desiccant and cannot hydrolyze the STP polymers. This is often necessary when using fillers, for example, in order to ensure adequate storage stability and constancy of the properties over longer storage periods.
  • all drying agents that are used in the field of formulating compositions based on polymers containing silane groups are suitable.
  • suitable drying agents are vinyltrimethoxysilane, vinyltriethoxysilane, vinylmethyldimethoxysilane, a-functional silanes such as O-methylcarbamatomethylmethyldimethoxysilane, O-methylcarbamatomethyltrimethoxysilane, O-ethylcarbamatomethylmethyldiethoxysilane, or O-ethylcarbamatomethyltriethoxysilane, orthoformic esters, calcium oxide or molecular sieves.
  • a-functional silanes such as O-methylcarbamatomethylmethyldimethoxysilane, O-methylcarbamatomethyltrimethoxysilane, O-ethylcarbamatomethylmethyldiethoxysilane, or O-ethylcarbamatomethyltriethoxysilane
  • orthoformic esters calcium oxide or molecular sieves.
  • oligomeric (partially condensed) forms of the silanes mentioned are also suitable.
  • component A comprises a desiccant in an amount of between 1% and 15% by weight based on component A, which desiccant is preferably a monomeric or oligomeric vinyl-functional silane or siloxane is, in particular an oligomeric vinyl-functional siloxane.
  • silane OS hydrolyzable organosilanes
  • Silane OS can also act very generally as drying agents, since they react with water and use up one water molecule per flydrolysis reaction.
  • silanes count as drying agents which are generally more reactive than the polymers STP in the composition.
  • Such higher reactivity is usually only achieved by silanes containing vinyl groups or a-functional silanes.
  • other silanes therefore belong to silane OS as described further below, provided they do not have an amino group, even if they could have an effect as water scavengers.
  • Amine AM Component A of the two-component composition preferably comprises at least one amine AM having at least one free amino group or one latent amino group which can be released via hydrolysis.
  • an amine AM in the composition has the advantage that it contains a co-catalyst which can in particular catalyze the hydrolysis of the silane groups present. With this, the curing can be significantly accelerated after mixing with component B and the presence of sufficient water.
  • the reactivity and the catalytic activity of the amine AM increases with the basicity of the amino group or groups present.
  • the amine AM can be an amine having one or more primary, secondary, or tertiary amino groups in any combination.
  • Amidines and guanidines are also suitable as amine AM.
  • the amine AM has at least one primary and/or one secondary amino group. With regard to their reactivity, such amines are particularly suitable in the two-component composition according to the invention.
  • Amines AM which do not have a free amino group but instead have a blocked, latent amino group which can be released via hydrolysis are also suitable.
  • Such an embodiment has the advantage that the amine AM can also act as a drying agent due to the release reaction and the storage stability is improved, especially in the case of insufficiently predried components A.
  • highly reactive and/or highly concentrated amines AM can also be used in latent form, which is advantageous can be when particularly rapid curing is desired after mixing in water-containing component B, but at the same time the risk of insufficient storage stability is to be avoided. It such amines with partially blocked amino groups can also be used.
  • Suitable amines AM having at least one latent amino group which can be released via hydrolysis are amines whose amino group has been reacted with a ketone to form a hydrolysis-labile imine, or which have been reacted with an aldehyde to form an aldimine. There are no particular restrictions on the manner of derivatization of the amine as long as the free amine is formed upon contact with water.
  • Component A of the two-component composition preferably has an amine AM content in the range from 0.1 to 15% by weight, in particular in the range from 0.2 to 10% by weight, based on component A. Such compositions cure particularly quickly.
  • the amine AM comprises or consists of an amino-containing silane AS.
  • an amino group-containing silane AS also contains at least one silane group, which is incorporated into the resulting polymer network during curing. This has the advantage that the amine AM is prevented from exuding after curing and the adhesion on many substrates is also improved.
  • the amino group-containing silane AS comprises at least one trialkoxysilane having an aminoalkyl radical bonded to the silicon atom which has primary and/or secondary amino groups and/or comprises at least one organosilane of the formula (IIa), where R d is a divalent, linear or branched alkyl radical with 2 to 10 carbon atoms, which optionally contains a hydroxyl group and an ether oxygen; and R e is a divalent, linear or branched alkyl radical of 2 to 10 carbon atoms, optionally containing a secondary amino group; and
  • R a represents a hydrogen atom or a methyl or ethyl group.
  • a particularly preferred silane AS containing amino groups is selected in particular from the group consisting of 3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, 3-amino-2-methylpropyltrimethoxysilane, 4-aminobutyltrimethoxysilane, 4-amino-3, 3-dimethylbutyltrimethoxysilane, 3-aminopropyldimethoxymethylsilane, N-(2-aminoethyl)-3-aminopropyldimethoxymethylsilane and N-(2-aminoethyl)-N'-[3-(trimethoxysilyl)propyl]ethylenediamine, and their analogues with ethoxy groups instead of the methoxy groups on the silicon.
  • 3-aminopropyltrimethoxysilane 3-aminopropyltriethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane or N-(2-aminoethyl)-3-aminopropyltriethoxysilane.
  • amine AM also suitable as amine AM are, for example, amino-functional alkylsilsesquioxanes such as amino-functional methylsilsesquioxane or amino-functional propylsilsesquioxane.
  • aminosilanes AS having at least one latent amino group which can be released via hydrolysis.
  • amines AM with at least one latent amino group that can be released via hydrolysis such aminosilanes AS offer the advantage that the amino group is not directly catalytically active for the hydrolysis of the silanes, but first has to be released hydrolytically. This enables a further extension of the pot life of the two-component composition according to the invention, since the hydrolysis of the latent amino groups must take place first.
  • Suitable aminosilanes AS with at least one latent amino group that can be released via hydrolysis are, for example, aminosilanes whose amino group has been reacted with a ketone to form a hydrolysis-labile imine.
  • Such aminosilanes AS are commercially available, for example 3-triethoxysilyl-N- (1,3-dimethyl-butylidene)propylamine, a 3-aminopropyltriethoxysilane whose amino group has been reacted with 2-hexanone to form an imine and which is available under the tradename KBE-9103P from Shin Etsu.
  • Component A preferably has the two-component
  • Composition contains amino-containing silane AS in the range from 0.1 to 15% by weight, in particular in the range from 0.2 to 10% by weight, based on component A.
  • Such compositions have high strength.
  • a high content of aminosilane AS enables a particularly high modulus of elasticity and particularly high strength, with the silane group preventing undesirable migration effects and exudation of the amine.
  • Silane OS silane OS
  • Component A of the two-component composition also optionally comprises at least one hydrolyzable silane OS that does not have an amino group.
  • additional silanes OS can bring various advantages. For example, they can improve curing or, as crosslinkers, improve mechanical properties by increasing the network density, or they can serve as adhesion promoters.
  • silane OS includes all hydrolyzable organosilanes, which are not included under aminosilane AS or those containing silane groups
  • Embodiments of the desiccant described above fall.
  • the additional silane OS is in particular a silane of formula (III).
  • the radical R 3 is independently a linear or branched, monovalent hydrocarbon radical having 1 to 12 carbon atoms, which optionally has one or more heteroatoms, and optionally has one or more CC multiple bonds and/or optionally cycloaliphatic and/or aromatic components.
  • the radical R 4 stands for a radical R a as described above.
  • the index p stands for a value from 0 to 4, with the proviso that if p stands for a value of 3 or 4, at least p-2 radicals R 3 each have at least one group which is reactive with the hydroxyl groups of the polydiorganosiloxane P, in particular a condensable group , ie, for example, have a hydroxyl group.
  • p has a value of 0, 1 or 2, preferably a value of 0.
  • Organosilanes which act as adhesion promoters, are particularly suitable as organosilane OS. These are alkoxysilanes which are preferably substituted with functional groups.
  • the functional group is, for example, a glycidoxypropyl or mercaptopropyl group.
  • the alkoxy groups of such silanes are preferably methoxy or ethoxy groups.
  • a suitable epoxy functional silane is in particular 3-glycidoxypropyltrimethoxysilane or 3-glycidoxypropyldimethoxymethylsilane or 3-glycidoxypropyltriethoxysilane.
  • a suitable mercapto-functional silane is in particular 3-
  • 3-glycodixypropyltrimethoxysilane 3-glycodixypropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane and 3-mercaptopropyltriethoxysilane. It is also possible to use a mixture of organosilanes OS as adhesion promoters.
  • silanes of the formula (III) are methyltrimethoxysilane, chloromethyltrimethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, octyltrimethoxysilane, methyltriethoxysilane, phenyltriethoxysilane, methyltripropoxysilane, phenyltripropoxysilane, octyltriethoxysilane, tetramethoxysilane, tetraethoxysilane, tetra-n-propoxysilane or tetra-n-butoxysilane.
  • the silane of the formula (III) is particularly preferably methyltrimethoxysilane, propyltrimethoxysilane, dimethyltrimethoxysilane or tetramethoxysilane or a mixture thereof, very particularly preferably methyltrimethoxysilane, propyltrimethoxysilane, octyltrimethoxysilane or mixtures thereof.
  • the person skilled in the art is aware that the use of partially or completely hydrolyzed silanes can result in the formation of oligomeric siloxanes, in particular dimers and/or trimers, which are formed by condensation of hydrolyzed silanes. Accordingly, oligomeric siloxanes can also be used as additives containing silane groups for the two-component composition.
  • suitable oligomeric siloxanes are flexamethoxydisiloxane, flexaethoxydisiloxane, flexa-n-propoxydisiloxane, flexa-n-butoxydisiloxane, octamethoxytrisiloxane, octaethoxytrisiloxane, octa-n-butoxytrisiloxane, decamethoxytetrasiloxane, and decaethoxytetrasiloxane.
  • composition is at least one organosilane OS of the formula (VI) wherein
  • R 21 independently represents a linear, cyclic or branched divalent hydrocarbyl radical of 2 to 12 carbon atoms, optionally containing cyclic and/or aromatic moieties; and R 22 represents a hydrogen atom or a group of formula (Via).
  • each R 21 is a linear or branched divalent hydrocarbyl radical having from 2 to 10 carbon atoms. Even more preferably, each R 21 is independently selected from the group consisting of ethanediyl, the isomers of propanediyl, the isomers of butanediyl, the isomers of pentanediyl, the isomers of hexanediyl, cyclohexanediyl, the isomers of heptanediyl, the isomers of octanediyl and the isomers of nonanediyl.
  • the isomers of pentanediyl, in particular of 2,2-dimethylpropanediyl, are particularly preferred.
  • R 22 preferably represents a group of the formula (Via).
  • Suitable organosilanes OS of the formula (VI) and their preparation are described in WO 2008/121360 A1.
  • suitable commercially available organosilanes OS are CoatOSil* T-Cure (Momentive) and Silquest* Y-15866 (Momentive).
  • any mixture of the silanes mentioned above can also be used as the silane OS for the two-component composition.
  • the proportion of the organosilane OS is preferably 0.1 to 25% by weight, in particular 0.5 to 20% by weight, preferably 1 to 15% by weight, based on component A of the two-component composition.
  • Component A of the two-component composition also includes at least one catalyst K for the crosslinking of silane-functional polymers.
  • Catalyst K is a tin complex with two mercaptide ligands according to formula (V), where ligands L 1 independently represent alkyl mercaptides coordinated via sulfur, in particular C ⁇ to C16 alkyl mercaptides, preferably Cs to C14 alkyl mercaptides, most preferably C10 to C12 alkyl mercaptides, wherein ligands L 1 optionally have methyldialkoxysilane groups, preferably methyldimethoxysilane groups, and ligands L 2 independently represent C3 to C18 alkyl ligands, in particular C ⁇ to C14 alkyl ligands, preferably C ⁇ to C12 alkyl ligands.
  • Catalyst K is therefore an Sn(IV) complex having two C3 to C18 alkyl ligands L 2 , in particular two C ⁇ to C14 alkyl ligands L 2 .
  • Ligands L 2 C ⁇ to C14 alkyl ligands are preferred, in particular phenyl, hexyl, octyl or dodecyl ligands, most preferably octyl ligands. These form particularly storage-stable complexes and a particularly good activity according to the invention in the composition.
  • Catalyst K also has two mercaptide ligands L 1 coordinated via the sulfur atoms, in particular CO to C 16 alkyl mercaptides, where ligands L 1 optionally have methyldialkoxysilane groups, preferably methyldimethoxysilane groups.
  • mercaptide is used synonymously with the term thiolate and describes deprotonated RS ligands, where R is an organic radical.
  • ligands L 1 cannot represent a single bidentate ligand with two thiolate groups since the chelate effect may impair the effect according to the invention. Therefore, ligands L 1 must be two individually coordinated alkyl mercaptide ligands. It is preferred that these ligands do not have any other heteroatoms that can be coordinated to tin, such as amino or carboxylate groups. Ligands L 1 preferably do not include any functional groups with heteroatoms, apart from methyldialkoxysilane groups.
  • methyldialkoxysilane groups in particular methyldimethoxysilane groups
  • the methylalkoxysilane groups if present, have the same alkoxysilane groups as the polymers STP and/or any organosilanes OS that may be present.
  • ligands L 1 with trialkoxysilane groups are unsuitable since they impair the effectiveness of the catalyst and the storage stability of the composition.
  • Ligands L 1 are preferably dodecyl thiolate ligands, octadecyl thiolate ligands, or 3-mercaptopropylmethyldimethoxysilane ligands which are coordinated via the sulfur atom.
  • Dodecyl thiolate ligands are particularly preferred. These lead to a particularly effective, particularly storage-stable catalyst K. Dodecylthioliganden have the further advantage that, compared to ligands with shorter alkyl chains, they have a barely perceptible odor, but still, compared to ligands with longer alkyl chains, liquid at room temperature and are therefore easy to handle.
  • both ligands L 1 in the formula (V) are dodecyl mercaptide and both ligands L 2 are octyl.
  • both ligands L 1 in the formula (V) are 3-mercaptopropylmethyldimethoxysilane and both ligands L 2 are octyl.
  • Catalysts K can be prepared simply by stirring, for example, dialkyltin diacetates with the corresponding mercaptan ligands in a molar ratio of approximately 2:1 (ligand:tin complex) with one another at 23° C. for 24 h with exclusion of air.
  • By-products formed by ligand exchange, such as acetic acid, can advantageously be removed, for example by distillation at reduced pressure.
  • the proportion of catalyst K for the crosslinking of polydiorganosiloxanes is preferably 0.05 to 10% by weight, in particular 0.1 to 5% by weight, preferably 0.25 to 4% by weight, based on component A of the two-component composition.
  • component A contains, in addition to the silane-containing polymer STP and the catalyst K, preferably also drying agents, amine AM and optionally also silanes OS, as well as other customary auxiliaries and additives.
  • the second component B of the two-component composition contains at least between 1 and 75% by weight of water, based on component B, the water preferably being present in a dispersed form in a mixture with filler and/or plasticizer and optionally further additives.
  • Component B of the two-component composition comprises between 1% and 75% by weight, in particular between 5% and 70% by weight, preferably between 10% and 60% by weight, more preferably between 25% by weight and 50% by weight water, preferably emulsified water, based on component B.
  • Water in component B leads to rapid, uniform curing of the mixed two-component composition and is essential in order to enable rapid and homogeneous curing according to the invention, particularly in deeper layers.
  • Water is particularly preferably present in an amount of between 30% by weight and 50% by weight, based on component B.
  • the water is preferably not present in free form or as adsorbed water (e.g. on fillers), but rather as an emulsion or macroscopically homogeneous mixture (e.g. together with plasticizers). This enables more homogeneous mixing into component A with low concentration gradients and after
  • Component B is, in particular, a water-containing paste in which the water contained is thickened by at least one carrier material, which is typically selected from the group consisting of a plasticizer, a thickening agent and a filler.
  • component B can be varied depending on the embodiment of component A. It is of course clear to the person skilled in the art that the amount of component B used depends on the amount of water present therein. For example, if component B has a high water content of >50% by weight, component B is usually used in an amount of 1 to 10% by weight, based on the amount of component A. On the other hand, if component B contains, for example, only about 5% by weight of water, component B can also be used in an amount of about 50% by weight, based on the amount of component A.
  • the proportion of water in the entire two-component composition is preferably in the range that 50 to 100% of all moisture-reactive groups in the composition can be reacted with the water present.
  • an excess of water can also be used without problems and possibly advantageously, which is, for example, twice the molar amount of water based on all hydrolyzable silane groups in component A.
  • Component B of the two-component according to the invention is preferably in the range that 50 to 100% of all moisture-reactive groups in the composition can be reacted with the water present.
  • an excess of water can also be used without problems and possibly advantageously, which is, for example, twice the molar amount of water based on all hydrolyzable silane groups in component A.
  • the composition preferably contains plasticizers and fillers.
  • the plasticizers are preferably used in concentrations of 5-95% by weight, preferably 10-75% by weight, based on the total weight of component B.
  • component B can also contain fillers, as described below, in concentrations of preferably 5-70% by weight, more preferably 30-60% by weight, based in each case on the total weight of component B.
  • Component B can also contain thickeners. These are preferably water-soluble or water-swellable polymers or inorganic thickeners.
  • organic thickeners examples include starch, dextrins, oligosaccharides, cellulose, cellulose derivatives such as carboxymethyl cellulose, cellulose ethers, methyl cellulose, hydroxyethyl cellulose or hydroxypropyl cellulose, agar-agar, alginates, pectins, gelatin, carrageenan, tragacanth, gum arabic, casein, polyacrylamide, poly(meth )acrylic acid derivatives, polyvinyl ethers, polyvinyl alcohols, polyamides or polyimines.
  • starch dextrins
  • oligosaccharides examples include starch, dextrins, oligosaccharides, cellulose, cellulose derivatives such as carboxymethyl cellulose, cellulose ethers, methyl cellulose, hydroxyethyl cellulose or hydroxypropyl cellulose, agar-agar, alginates, pectins, gelatin, carrageenan, tragacanth,
  • the preferred amounts of thickeners are 0-10% by weight, based on the total weight of component B.
  • Thickening inorganic fillers can also be used for thickening.
  • thickening inorganic fillers are polysilicic acids, pyrogenic silicic acids, aluminosilicates or clay minerals. Further rheology additives can also be added as described further below.
  • surfactants emulsifiers or other mixture stabilizers in component B, as a result homogeneous mixture without deposits is obtained for a long period of time.
  • the two-component composition can optionally contain other components in one or both of components A and B.
  • Such further additives are selected from the group consisting of fillers, hydrophilic or hydrophobic silicas, plasticizers, solvents, rheology additives, surfactants, pigments, emulsifiers, UV or oxidation stabilizers, flame retardants, biocides and non-moisture-reactive polymers or resins
  • At least one or two or more of these optional additives or optionally a combination of all of the additives mentioned can be present in the composition.
  • the optional additives are explained in more detail below.
  • additives may improve the processability and miscibility of component A and/or component B and/or the blended two-part composition, or they may improve mechanical properties, storage stability, or cure characteristics. However, they are not essential for the effect of the invention.
  • composition according to the invention can also preferably comprise at least one rheological additive, for example a urea compound, a polyamide wax or a pyrogenic silica.
  • rheological additive for example a urea compound, a polyamide wax or a pyrogenic silica.
  • Thixotropic agents for example, can be used as rheological additives.
  • Polyamide wax, hydrogenated castor oil, stearate salts or urea derivatives are mentioned as examples.
  • Some fillers can also be used to adjust the flow properties, for example hydrophilic fumed silica, coated hydrophobic fumed silica, precipitated silica and precipitated chalk.
  • the composition according to the invention can also preferably comprise at least one plasticizer, either in component A, in component B, or in both components.
  • suitable plasticizers are esters of organic carboxylic acids or their anhydrides, such as phthalates, especially diisononyl phthalate or diisodecyl phthalate, hydrogenated phthalates, especially diisononyl 1,2-cyclohexanedicarboxylate, adipates, especially dioctyl adipate, azelates and sebacates, polyols, especially polyoxyalkylene polyols or polyester polyols, organic Phosphoric and sulfonic acid esters or polybutenes.
  • the storage stability of the two components of the two-component composition is not adversely affected by the presence of such a component, i.e. the composition changes in its properties , in particular the application and curing properties, are not changed or only slightly changed during storage.
  • the constituents mentioned in component A contain no or at most traces of water or release them during storage. Therefore, it may be useful to chemically or physically dry certain ingredients before mixing them into the composition.
  • the composition also has at least one filler in one or both of components A and B, in particular in component A and component B.
  • the filler affects both the rheological properties of the uncured composition and the mechanical properties and surface finish of the cured composition. Both active and passive fillers can be used in the two-component composition.
  • Suitable fillers are inorganic and organic fillers, for example natural, ground or precipitated calcium carbonates, which are optionally coated with fatty acids, in particular stearic acid, or otherwise, calcined kaolins, aluminum oxides, aluminum hydroxides,
  • Preferred fillers are calcium carbonates, calcined kaolins, highly disperse silicic acids and flame-retardant fillers, such as flydroxide or hydrates, in particular hydroxides or hydrates of aluminum, preferably aluminum hydroxide.
  • the composition contains highly disperse silicic acids from pyrolysis processes or precipitated and/or ground calcium carbonates, in particular with a hydrophobic coating, as a filler.
  • Component A preferably contains at least one filler, in particular precipitated and/or ground, preferably hydrophobically coated, calcium carbonate.
  • Component A preferably contains highly disperse silicic acids from pyrolysis processes.
  • Component A preferably contains less than 5% by weight of carbon black, based on component A. In some preferred embodiments, component A contains no carbon black. Soot can under certain circumstances affect the inventive effect of the catalyst K, especially if the soot is present in component A, since it can possibly interact with the thiolate ligands of the catalyst K. This can shorten the pot life. However, it is entirely possible to use carbon black, in which case the amount of catalyst K and/or amine AM should be adjusted if necessary. It is only advisable to first routinely evaluate the influence of the desired amount of soot on the pot life.
  • a suitable amount of filler is, for example, in the range from 10 to 80% by weight, in particular 15 to 70% by weight, preferably 30 to 60% by weight, based on the total two-component composition.
  • composition according to the invention can also comprise, in one or both components, at least one stabilizer against oxidation, heat, light and UV radiation.
  • Antioxidants or light stabilizers such as so-called HALS stabilizers, sterically hindered phenols, thioethers or benzotriazole derivatives, for example, can be used as stabilizers.
  • composition can also contain fungicides, biocides, flame retardants, pigments, etc. in one or both components.
  • the two-component composition according to the invention is free from compounds containing isocyanate groups.
  • the Isocyanate group includes free and blocked isocyanate groups.
  • the polymer STP containing silane groups preferably has no isocyanate group.
  • the polymer STP containing silane groups is also preferably free of alcoholic OH groups which are bonded to a carbon atom.
  • a particularly preferred embodiment of component A of the composition according to the invention comprises, based in each case on the entire component A, between 10% by weight and 50% by weight of organic silane-group-containing polymer STP; and between 25% and 60% by weight fillers; and between 0.1% and 15% by weight of amine AM; and between 0.1% and 15% by weight desiccant; and between 0.1% and 15% by weight hydrolyzable silane OS not having an amino group; and between 5% and 25% by weight plasticizer; and between 0.1% and 5% by weight of Catalyst K; and optionally further additives selected from the group consisting of fillers, hydrophilic or hydrophobic silicas, plasticizers, solvents, rheology additives, surfactants, pigments, emulsifiers, UV or oxidation stabilizers, flame retardants, biocides and non-moisture-reactive polymers or resins, with the proviso that the respective amounts are selected so that they all add up to 100% by weight.
  • component B of the composition according to the invention comprises, in each case based on the total component B, between 5% by weight and 60% by weight water, preferably dispersed water; and between 5% and 20% by weight silica, preferably hydrophilic silica; and between 20% and 60% by weight of plasticizers, preferably polyether-based plasticizers; and optionally other additives selected from the group consisting of fillers, hydrophilic or hydrophobic silicas, plasticizers, solvents, rheology additives,
  • Surfactants pigments, emulsifiers, UV or oxidation stabilizers, flame retardants, biocides and non-moisture-reactive polymers or resins, with the proviso that the respective amounts are selected such that they all add up to 100% by weight.
  • the two-component composition according to the invention is used in such a way that the weight ratio of component A to component B when mixed is >1:1, in particular from 10:1 to 60:1, 10:1 to 50:1, preferably from 15:1 to 50:1.
  • components A and B are typically stored in separate packaging or in a packaging which has two compartments which are separate from one another.
  • Component A is in one chamber and component B is in the other chamber of the packaging.
  • Suitable packaging is, for example, double cartridges, such as twin or coaxial cartridges, or multi-chamber tubular bags with an adapter.
  • the two components A and B are preferably mixed with the aid of a static mixer which can be placed on the packaging with two chambers.
  • Such suitable packaging is described, for example, in US 2006/0155045 A1, WO 2007/096355 A1 and in US 2003/0051610 A1.
  • the two components A and B are typically stored separately from one another in barrels or hobbocks and are pressed out during application, for example by means of gear pumps and mixed up.
  • the composition can be applied to a substrate by hand or in an automated process using a robot.
  • the use of the composition according to the invention as a two-component composition has the advantage that the chemical crosslinking of the silane groups in the composition proceeds more quickly by directly mixing in the water-containing component B and thus strength is built up more quickly and the composition hardens more quickly. Another advantage is that curing can take place independently of the ambient humidity.
  • component B of the two-component composition described above is prepared and stored with the exclusion of moisture.
  • the two components are stable in storage, i.e. they can be stored in a suitable packaging or arrangement, as described above, in the absence of moisture for a period of several months up to a year or longer without them becoming in change their application properties or their properties after curing to an extent relevant to their use.
  • the storage stability is usually determined by measuring the viscosity or the reactivity over time.
  • components A and B are mixed with one another, for example by stirring, kneading, rolling or the like, but in particular using a static mixer.
  • the hydrolyzable silane groups of the silane-group-containing polymer STP of component A come into contact with water from component B, as a result of which the composition is cured by condensation reactions, initially with the formation of silanol groups.
  • the curing of the two-component composition takes place in particular at room temperature, but can also be accelerated by heating.
  • the reaction products of the condensation reaction also include, in particular, compounds of the formula HO—R a , where R a has already been described above.
  • reaction product of formula FIO-R a is a compound that readily volatilizes from the crosslinking or already crosslinked composition.
  • the invention also relates to a cured composition as obtainable from a two-component composition described above by mixing component A with component B.
  • the invention also relates to the use of two-component compositions as described above as an adhesive, sealant, as a coating or as a casting compound.
  • the composition according to the invention is preferably used as an adhesive.
  • the two-component composition according to the invention is used in particular in a method of bonding two substrates S1 and S2, comprising the steps of a) application of a two-component composition as described above to a substrate S1 and/or a substrate S2; b) contacting the substrates S1 and S2 via the applied composition within the open time of the composition; c) curing of the composition by reaction of components A and B; wherein the substrates S1 and S2 are the same as or different from each other.
  • composition according to the invention is preferably also used in a method of sealing or coating comprising the steps a′) application of a two-component composition according to the preceding description to a substrate S1 and/or between two substrates S1 and S2; b') curing of the composition by reaction of components A and B; wherein the substrates S1 and S2 are the same as or different from each other.
  • the two-component composition according to the invention preferably has a pasty consistency with pseudoplastic properties.
  • a composition is applied to the substrate with a suitable device, preferably in the form of a bead, which advantageously has a substantially round or triangular cross-sectional area.
  • a composition according to the invention with good application properties has high stability and short stringing. This means that it remains in the applied form after application, ie does not flow apart, and after the application device has been set down, it does not pull a thread or only pulls a very short thread, so that the substrate is not soiled.
  • Particularly suitable substrates S1 and/or S2 are substrates which are selected from the group consisting of concrete, mortar, brick, tile, ceramic, gypsum, natural stone such as granite or marble, glass, glass ceramic, metal or metal alloy such as aluminum, steel, Non-ferrous metal, galvanized metal, wood, plastic such as PVC, polyethylene, polyamide, polymethyl (meth)acrylate, polyester, epoxy resin, paint and varnish.
  • the two-component composition is used in particular in industrial production, in particular of vehicles and everyday objects, and in construction, in particular in civil engineering and structural engineering.
  • the two-component composition is preferably used in industrial production.
  • the invention also relates to an article which has an at least partially cured composition as described above, this article being in particular a building, an industrial good or a means of transport, in particular an industrially manufactured good or a part thereof.
  • An exemplary list of such articles are houses, glass facades, windows, baths, bathrooms, kitchens, roofs, bridges, tunnels, streets, automobiles, trucks, rail vehicles, buses, ships, mirrors, panes, tubs, white goods, household appliances, dishwashers, washing machines, Oven, headlights, fog lights or solar panels.
  • the composition hardens unexpectedly quickly and very evenly. Irrespective of the mixing ratio selected and the amount of catalyst contained, as long as enough water is mixed in, the pot life and the end properties, in particular mechanics, of the cured composition are largely the same. This is extremely beneficial and allowed gives a user great flexibility when setting the mixing ratio. At the same time, mixing errors are forgiven.
  • composition according to the invention hardly increases its viscosity during the pot life and to a much lesser extent than traditionally catalyzed compositions based on polymers containing silane groups.
  • composition according to the invention hardens extremely quickly and almost abruptly, while compositions of the prior art which are not catalyzed according to the invention begin to harden evenly but more slowly immediately after mixing.
  • the viscosity remains comparatively low over the entire pot life. This enables a very efficient process management, since the composition remains pumpable and easy to apply, hardens extremely quickly after application and the substrate to which the composition has been applied can be further processed or transported immediately.
  • Two-component compositions of the prior art usually have either a very long pot life and at the same time a very long curing time, or else very rapid curing and therefore an extremely short, user-unfriendly pot life.
  • the present invention makes it possible to set long or short pot lives as required; in any case, however, they permit very rapid curing after application.
  • Catalysts K1 and K3 are according to the invention, catalyst K2 is a reference example.
  • K1 Fomrez® UL-32 (Galata Chemicals)
  • K2 TIB KAT® 218 (TIB Chemicals)
  • Table 2 Catalysts K1 to K4 used. The columns describe the ligands L 1 and L 2 according to formula (V). All catalysts are four-coordinate tin catalysts.
  • the adhesive was shaped like a dumbbell in accordance with ISO 527, Part 2, 1B and cured for 7 days at 23° C. and 50% rh (relative atmospheric humidity). After a conditioning time of 24 hours at 23°C, 50% rh, the modulus of elasticity in the range from 0 to 100% elongation (“E modulus”), the tensile strength and the elongation at break of the test specimens produced in accordance with DIN EN ISO 527 on a Zwick Z020 Tensile testing machine measured at 23°C and 50% rh and a test speed of 10 mm/min.
  • E modulus modulus of elasticity in the range from 0 to 100% elongation
  • the pot life was measured in a viscometer as the time until the viscosity started to increase sharply after mixing the two components. Specifically, the time until the viscosity of the mixture increased to 1000 Pas was measured. Furthermore, it was observed whether the increase in viscosity was continuous (K) or abrupt (S), whereby in the latter case a “hockey stick” shape of the viscosity curve was observed (with a relatively flat increase at the beginning and a significantly more rapid increase towards the end of the measuring range examined from 0-1000 Pa s.
  • the time-resolved measurement of the viscosity was carried out on a plate-plate rheometer MCR 302 (Anton Paar) with a plate diameter of 25 mm and a plate distance of 1 mm at a frequency of 0.1 s_1 and a temperature of 20 C.
  • the two components were first mixed for 30 seconds in a speed mixer (Flauschild) and immediately applied to the plates for the measurement.

Abstract

La présente invention concerne un procédé comprenant : un composant A, qui comprend au moins un polymère contenant un groupe silane organique, de préférence au moins un agent de séchage, de préférence au moins une amine ayant au moins un groupe amino libre ou un groupe amino latent pouvant être libéré par hydrolyse, éventuellement au moins un silane hydrolysable qui ne possède pas de groupe amino, et au moins un catalyseur pour la réticulation de polymères à fonction silane ; et comprenant un composant B, qui comprend entre 1 et 75 % en poids d'eau, l'eau étant de préférence dispersée dans un mélange avec une charge et/ou un plastifiant et éventuellement d'autres additifs ; et comprenant éventuellement d'autres additifs dans le composant A et/ou le composant B, sélectionnés dans le groupe constitué par des charges, des acides siliciques hydrophiles ou hydrophobes, des plastifiants, des solvants, des additifs rhéologiques, des tensioactifs, des pigments, des émulsifiants, des stabilisateurs UV ou d'oxydation, des agents ignifuges, des biocides et des polymères ou des résines réactifs à l'humidité ; caractérisé en ce que le catalyseur est un complexe d'étain ayant deux ligands de mercaptide selon la formule (V), les ligands L1 représentant indépendamment des mercaptides d'alkyle coordonnés au soufre, en particulier des mercaptides d'alkyle en C6 à C16, les ligands L1 comprenant éventuellement des groupes méthyl dialcoxysilane, de préférence des groupes méthyl diméthoxysilane, et les ligands L2 représentant indépendamment des ligands alkyle, en particulier des ligands alkyle en C6 à C14 . La composition selon l'invention permet un temps de pot exceptionnellement long et simultanément un durcissement très rapide et une excellente stabilité au stockage.
EP22722268.4A 2021-04-21 2022-04-12 Composition à deux composants à durcissement rapide de polymères silylés à longue durée d'ouverture Pending EP4326794A1 (fr)

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PCT/EP2022/059757 WO2022223373A1 (fr) 2021-04-21 2022-04-12 Composition à deux composants à durcissement rapide de polymères silylés à longue durée d'ouverture

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JP (1) JP2024516071A (fr)
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WO (1) WO2022223373A1 (fr)

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DE19517452A1 (de) 1995-05-12 1996-11-14 Henkel Teroson Gmbh Zweikomponenten-Kleb-/Dichtstoff mit hoher Anfangshaftfestigkeit
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KR100312186B1 (ko) * 1996-02-14 2002-07-27 오시 스페셜티스, 인코포레이티드 수용성 실릴화 폴리머 경화성 조성물
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ATE336557T1 (de) 2004-06-23 2006-09-15 Sika Technology Ag Geruchsarme (meth)acrylat klebstoffe mit hoer schlagfertigkeit
JP5199530B2 (ja) * 2004-12-08 2013-05-15 株式会社カネカ 耐汚染性付与組成物、塗料組成物および該塗料組成物から得られる塗膜
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JP2024516071A (ja) 2024-04-12
BR112023017221A2 (pt) 2023-11-21
CN117178004A (zh) 2023-12-05
WO2022223373A1 (fr) 2022-10-27

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