EP1474463A2 - Melange durcissable a base d'hydrolysats d'organosilanes et de polyisocyanates bloques - Google Patents

Melange durcissable a base d'hydrolysats d'organosilanes et de polyisocyanates bloques

Info

Publication number
EP1474463A2
EP1474463A2 EP02782731A EP02782731A EP1474463A2 EP 1474463 A2 EP1474463 A2 EP 1474463A2 EP 02782731 A EP02782731 A EP 02782731A EP 02782731 A EP02782731 A EP 02782731A EP 1474463 A2 EP1474463 A2 EP 1474463A2
Authority
EP
European Patent Office
Prior art keywords
hydrolyzable
hydrolysis
general formula
mixture according
group
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02782731A
Other languages
German (de)
English (en)
Inventor
Georg Wagner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTC Nano Tech Coatings GmbH
Original Assignee
NTC Nano Tech Coatings GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NTC Nano Tech Coatings GmbH filed Critical NTC Nano Tech Coatings GmbH
Publication of EP1474463A2 publication Critical patent/EP1474463A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
    • C23C22/74—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process for obtaining burned-in conversion coatings
    • 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
    • C08G18/2805—Compounds having only one group containing active hydrogen
    • C08G18/288—Compounds containing at least one heteroatom other than oxygen or nitrogen
    • C08G18/289—Compounds containing at least one heteroatom other than oxygen or nitrogen containing silicon
    • 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
    • C08G18/80—Masked polyisocyanates
    • C08G18/8061—Masked polyisocyanates masked with compounds having only one group containing active hydrogen
    • C08G18/807—Masked polyisocyanates masked with compounds having only one group containing active hydrogen with nitrogen containing compounds
    • 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
    • C08G18/80—Masked polyisocyanates
    • C08G18/8061—Masked polyisocyanates masked with compounds having only one group containing active hydrogen
    • C08G18/807—Masked polyisocyanates masked with compounds having only one group containing active hydrogen with nitrogen containing compounds
    • C08G18/8074—Lactams
    • 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
    • C08G18/80—Masked polyisocyanates
    • C08G18/8061—Masked polyisocyanates masked with compounds having only one group containing active hydrogen
    • C08G18/8096—Masked polyisocyanates masked with compounds having only one group containing active hydrogen with two or more compounds having only one group containing active hydrogen
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • C09D183/06—Polysiloxanes containing silicon bound to oxygen-containing groups
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
    • C23C2222/20—Use of solutions containing silanes

Definitions

  • Coatings based on organically modified, crosslinked polysiloxanes are known. They have valuable physical and chemical properties and adhere well to various substrates (metals such as steel, brass, aluminum, magnesium; ceramics; polymers; glass). They are mechanically and chemically resistant, e.g. against abrasion or most chemicals.
  • coatings are produced using the so-called sol-gel process, in which certain organosilanes (alkoxysilanes), optionally together with metatl alkoxides such as e.g. Aluminum propoxylate or butoxylate hydrolyzes, with which aqueous sols of mostly oligomeric, at times stable, condensable organosilanols are obtained, which eventually change into gels when water escapes.
  • organosilanes alkoxysilanes
  • metatl alkoxides such as e.g. Aluminum propoxylate or butoxylate hydrolyzes
  • W3Ssrig-alcoholic solutions can be stored temporarily and can be polycondensed by further water or solvent removal to form a gel. When applied to a substrate and thermally compressed, the gels form firmly adhering masses.
  • the hydrolyzates obtained as brine have already been mixed with condensable additives (e.g. bisphenols), which are incorporated into the network formed during crosslinking.
  • condensable additives e.g. bisphenols
  • the modified brines are also suitable as coating agents which process in the same way as the unmodified organosilanols, i.e. after being applied to a substrate, converted into a gel and finally can be thermally compacted.
  • silicon-containing monomers It is known to modify the silicon-containing monomers.
  • a known class of silicon-containing monomers are the silanes modified with epoxy groups or silanols. These monomers and their use are described, for example, in DE-OS 197 37 475.
  • blocked (blocked) polyisocyanates can be used as modifiers for certain polysiloxane gels or their condensable precursors.
  • silanols modified with epoxy groups are reacted with blocked isocyanates in the sol-gel process.
  • the silanes used, modified with epoxy groups and their condensable hydrolysis products and the blocked (blocked) poly- Isocyanates are known classes of compounds which are described in more detail below.
  • the invention relates to a curable mixture and a process based on this curable mixture for producing polymeric crosslinked compositions based on modified polysiloxanes by reacting hydrolysis products of partially hydrolyzable silanes which have at least one hydrolytically non-cleavable, silicon-bonded substituent and at least one have two substituents which can be converted into silanol functions, with OH-reactive polyvalent compounds, silanes being used which have at least one non-hydrolyzable substituent bearing an epoxy group and whose hydrolysis products are reacted with at least one blocked polyisocyanate with dehydration.
  • the invention particularly relates to a curable mixture containing:
  • B) (A) in which R 1 represents a non-hydrolyzable radical, R 2 represents a non-hydrolyzable radical carrying a functional group and X represents identical or different radicals which are selected from the hydroxyl group and hydrolyzable substitution products of a hydroxyl group, or an oligomer derived therefrom, where a has a value of 0 or 1, b has a value of 0 to 3 and a and b together have the value 1, 2 or 3, with the proviso that at least one of the substituents R 2 has an epoxy group as a functional group;
  • the invention further relates to a curable mixture which comprises a hydrolysis Contains product which has been obtained by jointly hydrolyzing at least one organosilane of the general formula A with up to 50% by weight, based on A:
  • At least one silane of the general formula SiX 4 in which X has the above meaning; at least one silane not bearing an epoxy group;
  • At least one hydrolyzable alkoxide of an earth metal or chemically related metal At least one hydrolyzable alkoxide of an earth metal or chemically related metal
  • At least one aromatic or aliphatic diol At least one silane of the general formula SiX 4 , in which X has the meaning given above and / or
  • the invention also extends to the coatings or moldings produced using the mixtures.
  • organosilanes of the general formula A or their mixtures or oligomers derived therefrom, optionally together with up to 50% by weight of the other compounds mentioned above, are hydrolyzed to silanols.
  • the silanols are at least partially present as oligomers in the sols according to the invention.
  • the sols are mixed with the blocked isocyanate (s) and, if appropriate, stored in this form.
  • the mixtures are converted into the gel state by the removal of water in the heat and thus irreversibly crosslinked.
  • At least one aromatic or aliphatic diol At least one aromatic or aliphatic diol
  • the invention thus relates in particular to brine as obtained by the above method.
  • the silanols formed are generally in the form of stable, at least partially oligomeric, but low-molecular substance mixtures.
  • the introduced term "brine" for these mixtures of substances takes into account the fact that in many cases they are not real solutions, but rather molecularly dispersed quasi-soluble macromolecules.
  • the invention should not be understood as being restricted to a specific state of matter.
  • these hydrolysis products are used no later than immediately before use, i.e. Before being converted into the hardened state, at least one blocked polyisocyanate is added, and the mixture obtained is polycondensed and hardened in this way. Hardening is generally done by heating.
  • the organosilanes of the general formula A according to the invention are silicon compounds which have two or preferably three hydrolyzable radicals and one or two, preferably a non-hydrolyzable radical. From the point of view of the chemistry of the macromolecular compounds, they are polymerizable monomers, optionally after hydrolysis. In the mixtures according to the invention, at least one organosilane is used which carries at least one non-hydrolyzable radical (substituent) which has an epoxy group as the functional group.
  • Other organosilanes which are encompassed by the above formula A and have no epoxy group can also be used as indicated.
  • hydrolyzable radicals X are halogen (F, Cl, Br and I, in particular Cl and Br), alkoxy (in particular C 1-4 alkoxy, such as methoxy, ethoxy, n-propoxy, i-propoxy and butoxy), aryloxy (in particular C 6 _ 10 aryloxy, e.g. phenoxy), acyloxy (in particular such as acetoxy and propionyloxy) and alkylcarbonyl (eg acetyl).
  • Particularly preferred hydrolyzable residues are alkoxy groups, especially methoxy and ethoxy.
  • non-hydrolysable radicals R 1 in the meaning of the invention are alkyl, in particular C ⁇ alkyl (such as methyl, ethyl, propyl and butyl), alkenyl (especially C 2-4 alkenyl, such as vinyl, 1-propenyl, 2-propenyl and butenyl), alkynyl (especially C 2-4 alkynyl such as acetylenyl and propargyl), and aryl, in particular such as phenyl and naphthyl), these groups optionally having one or more substituents, such as halogen and alkoxy.
  • Methacrylic and methacrylic oxypropyl residues also deserve mention in this context.
  • silicon compounds which can be used according to the invention can be, for example, the Pages 8 and 9 of EP-A-195 493 are taken.
  • organosilanes of the general formula A which have epoxy groups bonded via non-hydrolyzable radicals, and glycidyloxy- (Cl-6) alkylene, in which the radicals R 1 are identical or different (preferably identical) and represent a hydrolyzable group and R 2 represents a glycidyl or glycidyloxy (C 1 to C 2 n) alkylene radical, in particular a ß-glycidyloxyethyl, ⁇ -glycidyloxypropyl, ⁇ -glycidyloxybutyl, ⁇ -glycidyloxypentyl, ⁇ -glycidyloxyhexyi- or 2- (3,4-epoxycyclohexyl) ethyl residue. Because of its easy availability, ⁇ -glycidyloxypropyltrimethoxysilane is used in particular (hereinafter abbreviated GPTS).
  • GPTS ⁇ -glycidyloxy
  • Silicon compounds A which are particularly preferred according to the invention are those of the general formula R ⁇ SiR 2 , in which the radicals R 1 , different or preferably identical, stand for a hydrolyzable group (preferably C 1-4 alkoxy and in particular methoxy and ethoxy) and R 2 stands for a glycidyloxy (C 1 _ 6 ) alkylene radical.
  • Examples of other functional (additionally used) groups of the radical R 2 are above all ether, amino, monoalkylamino, dialkylamino, amido, carboxy, mercapto, thioether, vinyl, acryloxy, methacryloxy , Cyano, halogen, aldehyde, alkylcarbonyl, sulfonic acid or phosphoric acid groups.
  • These functional groups are bonded to the silicon atom via alkylene, alkenylene or arylene bridges, which can be interrupted by oxygen or sulfur atoms or -NH groups.
  • the bridge groups mentioned are derived, for. B. from the above-mentioned alkyl, alkenyl or aryl radicals.
  • the radicals R 2 preferably contain 1 to 18, in particular 1 to 8, carbon atoms.
  • the (identical or different) hydrolyzable groups X are selected from halogen (especially Cl and Br), alkoxy (especially C j ⁇ alkoxy, such as methoxy, ethoxy, n-propoxy, i-propoxy, butoxy), aryloxy (in particular Cß-icrAryloxy, for example phenoxy), acyloxy (in particular C - ⁇ - acyloxy, for example acetoxy and propionyloxy) and alkylcarbonyl (for example acetyl), amino, Monoalkylamino or dialkylamino with preferably 1 to 12, in particular 1 to 6 carbon atoms.
  • Particularly preferred hydrolyzable radicals are alkoxy groups, especially methoxy and ethoxy.
  • non-hydrolyzable substituents are olefinically unsaturated substituents, for example those with vinyl, allyl or crotyl radicals. Examples of such silanes are
  • H 2 C CH-SiCl 3
  • H 2 C CH-CH 2 -Si (OCH 3 ) 3
  • H 2 C CH-Si (OCH 2 OCH 3 ) 3
  • H 2 C CH-CH 2 -Si (OC 2 H 5 ) 3
  • H 2 C CH-Si (OCH 3 ) 3
  • H 2 C CH-CH 2 -Si (OCOCH 3 ) 3
  • H 2 C CH-Si (OC 2 H 5 ) 3
  • H 2 C C (CH 3 ) -COO-C 3 H 7 -Si (OCH 3 ) 3
  • H 2 C CH-Si (OC 2 H 4 OCH 3 ) 3
  • H 2 C C (CH 3 ) -COO-C 3 H 7 -Si (OC 2 H 5 ) 3
  • the composition can also contain other olefinically unsaturated, free-radically polymerizable (preferably epoxy- or hydroxyl group-containing) monomers, such as. B. meth (acrylates) are added which, under appropriate conditions (cf. the notes below), cause a polymerization which can be initiated by free radicals (e.g. with UV radiation), i.e. can enter into additional networking.
  • these monomers can also have two or more functional groups of the same type, e.g. in poly (meth) acrylates of polyols; the use of polyepoxides is also possible.
  • the organic species is polymerized in addition to the structure of the organically modified inorganic matrix, as a result of which the crosslinking density and thus also the hardness of the corresponding coatings and moldings increase.
  • hydrolyzable compounds of elements from the group Si, Ti, Zr, Al, B, Sn and V can also be used and preferably hydrolyzed with the silicon compound (s).
  • the presence of such elements in addition to silicon in the hydrolysis products often leads to an acceleration of the ring opening of the invention existing epoxy groups and therefore influences the durability of the ready-to-use mixtures.
  • their presence often means a significantly higher cost-effectiveness, so that the composition to be given to the mixtures according to the invention has to be considered in individual cases.
  • the amount of such additional compounds should in any case not exceed 70 mol% and in particular 50 mol% of all hydrolyzable compounds used, particularly preferably not more than 30 and in particular not more than 10 mol% of all hydrolyzable compounds used of which or the silicon compound (s) A are different.
  • Polyorganosilanols should behave chemically like polyalcohols: polyisocyanates should react with polyorganosilanols to form urethane polymers. Polyisocyanates also react with epoxy functions. Mixtures of unblocked isocyanates with condensable silanols have only a limited open time / pot life because their components react with one another at room temperature. As a result, many applications that require long-lasting tools (e.g. dip varnishes) are out of the question. In other condensation reactions, the reactivity of isocyanates has been mastered by converting the isocyanates into NCO-terminated prepolymers which react with water to form urea derivatives. However, this technique has the obvious disadvantage that the lifetime of even the few free isocyanate residues is limited.
  • the mixtures according to the invention are stable almost indefinitely and thus have the advantage that they do not have to be prepared immediately before work and then processed quickly, but can be offered ready for use like any conventional lacquer.
  • a great advantage of the systems according to the invention is the absence of free isocyanate, which is important for occupational safety.
  • the blocked polyisocyanates are used according to the invention, the blocking agent released evaporates if it is sufficiently volatile or remains in the coatings or moldings produced.
  • polyisocyanates are reaction products of polyvalent isocyanates with a blocking agent, i.e. a compound that has at least one active hydrogen atom in the molecule. These reaction products, their starting materials, production and reaction behavior are known. In some cases, they are commercial products that were previously used for other purposes, e.g. be used for the production of polyurethanes.
  • the active (acidic) hydrogen need not be part of a hydroxyl group. Many contain only one active hydrogen atom. The active hydrogen must be accessible, so it must not be sterically disabled. Therefore nitrogenous compounds are often good blocking agents. They can be aliphatic or aromatic in the form -NH or -NOH. The oxime derived from n-butanone is very often used (methyl ethyl ketoxime, MEKO).
  • Other suitable blocking agents are: caprolactam (CAPA), 3,5-dimethylpyrazole (DMP), 3-methylpyrazole (3-MP), pyrazole (Py), 4-bromo-3-methyl-pyrazole.
  • Diethyl malonate which has a reactive methylene group with two active hydrogen atoms, is also suitable but mostly only one of them reacts with -NGO.
  • the blocked polyisocyanates are stable and commercially available compounds and compound mixtures which are stable at room temperature and, even when mixed with polyols, are still stable at room temperature. Only at a temperature of (generally) above 100 ° C does the reaction proceed from right to left according to equation (1) and the blocking agent is released again.
  • the reaction with the sols according to the invention according to the method according to the invention can begin with the formation of polyurethane structures and / or polyureas.
  • the behavior of the blocked polyisocyanates in the mixtures according to the invention corresponds, apart from the temperature behavior, ie the lower reactivity, to that of the free polyisocyanates.
  • Blocked polyisocyanate emulsions can also be used.
  • R-NH-CO-ON C (C 2 H 5 ) 2 (I) with malonic ester to: R-NH-CO-CH (COO-C 2 H 5 ) 2 (II) with caprolactam to:
  • polyisocyanates which can be blocked are: 1,6-hexamethylene diisocyanate (HDI); Isocyanurate of 1,6-hexamethylene diisocyanate (HDI trimer); Biuret of 1,6-hexamethylene diisocyanate (HDI biuret); Isophorone diisocyanate (IPDI); Isocyanurate of isophorone diisocyanate (IPDI trimer); Tetramethylene xylene diisocyanate (TMXDI).
  • HDI 1,6-hexamethylene diisocyanate
  • HDI trimer Isocyanurate of 1,6-hexamethylene diisocyanate
  • HDI biuret Biuret of 1,6-hexamethylene diisocyanate
  • IPDI Isophorone diisocyanate
  • IPDI trimer Isocyanurate of isophorone diisocyanate
  • TXDI Tetramethylene xylene diisocyanate
  • Polymers of monomeric isocyanates can also be used as blocked isocyanates.
  • dimeric and trimeric polyisocyanates technical meaning.
  • a particularly readily available compound is tolylene diisocyanate blocked with malonic ester, which roughly corresponds to the following structural formula:
  • polyisocyanates are reacted with the various blocking agents in an approximately stoichiometric ratio of the functional groups to blocked polyisocyanates and give solid or liquid blocked polyisocyanates, usually with a low solvent content, so that they are present as liquids.
  • an epoxysilane eg "Glymo”
  • the reactive groups are best present in stoichiometric amounts, ie 0.5 mol of blocked dimeric isocyanate or 0.3 mol of blocked mol per mol of epoxy group-containing silane compound trimeric isocyanate is used, provided that the compounds used are each sufficiently defined.
  • the curable mixtures according to the invention should contain the silanols bearing the epoxy groups, the blocked polyisocyanates and any further condensable compounds which may be present in such a ratio that the cured end product contains as little as possible excess OH groups. Excess polyisocyanate can form polyureas with loss of CO 2 . Networking therefore takes place in every case. For starting materials, the composition of which is not well known, it is best to carry out a preliminary test to determine the proportions with which almost complete sales are achieved.
  • Examples of products for commercially available blocked isocyanates include: Desmodur® BL brands (Bayer AG), e.g. B. Desmodur® BL 1100, Desmodur® BL 1265 MPA / X; Vestanat® brands (Degussa-Hüls, Creanova® lacquer raw materials), e.g. B. Vestanat® B 1370; Additol® brands (Vianova Resins SpA), e.g. B. Additol® XL 465; Trixene® BI brands (Baxenden Chemicals Ltd.).
  • Emulsions of blocked polyisocyanates such as Halwedrol® EB 20140 W (Hüttenes- Albertus-Lackrohstoff GmbH) are also suitable.
  • the above references to trademark protection (®) of the designations used are non-binding and also apply if the respective products are mentioned in the examples below. Examples of the material basis of some commercial products:
  • the blocked polyisocyanates are added to the hydrolyzed epoxysilanes (for example glycidyloxypropyl) trimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane) in the stated proportions or molar ratios. Clear, slightly viscous liquids, depending on the dilution, are formed, which can easily be used as coating agents. However, they can also be used as binders and mixed, for example, with fillers such as pigments, colored and otherwise modified. For example, they can contain additives to improve the flow and the rheology and can be used as single-component coatings that can be applied to different substrates (eg metals) using the usual techniques.
  • epoxysilanes for example glycidyloxypropyl
  • the curing takes place by heating ("baking") to temperatures above 100 ° C., for example to 120 ° C. to 180 ° C., for a period of, for example, 10 minutes to 2 hours.
  • the best conditions for baking should be determined in a preliminary test and may vary depending on the starting material.
  • the slides adhere very well to the substrates and can be used, for example, on light metals without prior chromating (pickling). They are very hard and, in addition to good mechanical resistance, also have excellent corrosion-inhibiting properties. For example, in tests under the influence of salt spray, resistance of more than 2000 hours is achieved.
  • the layers can be very thin (e.g. from 5 ⁇ m for clear lacquers and from 15 ⁇ m for paints corresponding to fine pigmentation) that are not attacked by most organic solvents.
  • Aromatic polyols can be used as special modifiers. Such polyols are generally common market products and have, for example, an average molecular weight of at most 1000. Examples of such aromatic polyols are, for example, polyphenylene ethers which carry hydroxyl groups on at least 2 of the phenyl rings, and generally compounds (oligomers) in which aromatic rings are connected to one another by a single bond, -O-, -CO-, -SO 2 - etc. and which have at least (and preferably) two hydroxyl groups bonded to aromatic radicals.
  • the use of the commercially available bisphenol A (4,4 "-isopropylidene diphenol) is particularly preferred. Suitable modifying agents should not deteriorate the temperature resistance, but allow the production of more economical binders from case to case.
  • the curable mixtures according to the invention are particularly suitable as coatings of different aims, like the known mixtures.
  • Particularly interesting applications are: So-called Easy Clean coatings for metal surfaces in the wet area of apartments or public facilities such as Aluminum frames of shower cubicles, window panes, picture glazing.
  • An interesting area of application is the tarnish protection of silver jewelry, building fittings and non-ferrous metal applications. Dimensionally accurate screws and other small mass parts can also be coated as so-called drum goods.
  • the durability of the mixtures according to the invention at room temperature is usually about half a year to a year.
  • the processing viscosity eg for spray application
  • water or a solvent eg ethyl acetate, butyl acetate.
  • the coating is done by conventional methods such as spraying, spinning, dipping, flooding. Spraying and immersion processes are particularly suitable.
  • the coating is cured, ie the formation of a three-dimensional network, by baking at 120 ° C. for 60 minutes. The hardened coating reaches its full strength after 3 days of post-curing at room temperature.
  • Example 2 (1-component aqueous sol-gel basic system)
  • Example 4 (pigmented mixture according to the invention)
  • the coating materials of the invention can also be pigmented.
  • GPTS ⁇ -glycidyloxypropyltrimethoxysilane
  • aqueous HCl 0.1 molar
  • the batch heats up within a few minutes and becomes single-phase.
  • 14.2 g of a commercially available blocked isocyanate, Desmodur® BL 3370 MPA are added and dissolved with further stirring.
  • 5.5 g of a commercially available aluminum metallic pigment e.g.
  • Stapa® Metallux 200 from the manufacturer Eckart-Werke Erasmusong are added and dispersed with a dissolver for about 15 minutes at a low speed.
  • 40.0 g of solvent e.g. ethyl acetate
  • the approach is slightly cloudy and not very viscous.
  • the coating materials described above have hydrophobic character ter and have a low surface energy. Such coatings cannot normally be overpainted with conventional liquid and powder coatings and coating materials. They are advantageously even suitable as anti-graffiti coatings.
  • pyrogenic silica is dispersed in coating compositions according to the invention, coatings are formed after curing which have a micro-rough surface and a significantly increased surface energy and hydrophilicity.
  • Fumed silicas are highly disperse silicon dioxide particles, which are present as white powders and have a primary particle size between 7 and 50 nm.
  • the surface-untreated particles have a hydrophilic character because of the generally present silanol groups. Products with these properties are e.g. commercially available under the brand name Aerosil® (manufacturer Degussa AG).
  • Aerosil® manufactured by manufactureurer Degussa AG.
  • the amount of pyrogenic silica added can vary, for example, in the range of up to 30% by weight, based on the total amount of coating agent. A sufficient effect can often be achieved with the addition of 0.5% by weight of silica.
  • Coatings obtained using coating compositions modified with pyrogenic silica are particularly suitable as thin-layer primers - predominantly for light metals such as Al and Mg - and can be coated with liquid lacquers and with powder lacquers.
  • Various adhesives also adhere very well to the surfaces. This leads to adhesion promoters with very high corrosion protection. In this case, the usual preparation of the light metal surfaces for painting by chromating can also be dispensed with.
  • further dilution e.g. ethyl acetate, butyl acetate
  • the application is carried out by conventional methods such as spraying, spinning, dipping, flooding, etc. In particular spraying and dipping methods are very suitable.
  • After application it is cured by baking at 150 ° C for 60 minutes. The cured coating reaches its full strength after 3 days of post-curing at room temperature.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paints Or Removers (AREA)
  • Polyurethanes Or Polyureas (AREA)

Abstract

L'invention concerne un mélange durcissable qui contient au moins un hydrolysat d'un organosilane, de formule générale R1aR2bSiX(4-a-b), ou d'un oligomère dérivé de celui-ci, ainsi qu'au moins un polyisocyanate bloqué. Dans ladite formule, R1 est un groupe non hydrolysable, R2 est un groupe non hydrolysable comprenant un groupe fonctionnel et X représente des groupes identiques ou différents, choisis parmi le groupe hydroxyle et des produits de substitution hydrolysables d'un groupe hydroxyle, a est égal à 0 ou 1, b est compris entre 0 et 3 et la somme de a et b est égale à 1, 2 ou 3, avec la condition qu'au moins un des substituants R2 comprenne un groupe époxy comme groupe fonctionnel. L'invention concerne également des mélanges qui contiennent des pigments et/ou des matières de charge, un procédé pour produire des mélanges réticulés par réaction des hydrolysats, c'est-à-dire des polysiloxanes modifiés, avec les polyisocyanates bloqués, ainsi que des revêtements et des corps façonnés produits avec ces mélanges.
EP02782731A 2001-10-25 2002-10-19 Melange durcissable a base d'hydrolysats d'organosilanes et de polyisocyanates bloques Withdrawn EP1474463A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10152853A DE10152853A1 (de) 2001-10-25 2001-10-25 Mischung und Verfahren zur Herstellung von vernetzten Massen auf der Grundlage von modifizierten Polysiloxanen sowie damit hergestellte Überzüge und Formkörper
DE10152853 2001-10-25
PCT/DE2002/003953 WO2003037947A2 (fr) 2001-10-25 2002-10-19 Melange durcissable a base d'hydrolysats d'organosilanes et de polyisocyanates bloques

Publications (1)

Publication Number Publication Date
EP1474463A2 true EP1474463A2 (fr) 2004-11-10

Family

ID=7703787

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02782731A Withdrawn EP1474463A2 (fr) 2001-10-25 2002-10-19 Melange durcissable a base d'hydrolysats d'organosilanes et de polyisocyanates bloques

Country Status (4)

Country Link
US (1) US7776148B2 (fr)
EP (1) EP1474463A2 (fr)
DE (1) DE10152853A1 (fr)
WO (1) WO2003037947A2 (fr)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10353507A1 (de) * 2003-11-17 2005-06-30 Basf Coatings Ag Hydrolysate und/oder Kondensate von Epoxid- und Silangruppen enthaltenden Oligomeren und Polymeren, Verfahren zu ihrer Herstellung und ihre Verwendung
WO2006044340A2 (fr) * 2004-10-12 2006-04-27 Sdc Coatings, Inc. Compositions de revetement, articles, et procedes de revetement d'articles
DE202006019880U1 (de) 2006-02-24 2007-09-27 Gerhard Heiche Gmbh Korrosionsbeständiges Substrat
EP2001965B1 (fr) * 2006-03-31 2016-10-05 SDC Technologies, Inc. Compositions de revetement, articles et procedes de revetement d'articles
DE202006020021U1 (de) 2006-07-06 2007-11-29 Gerhard Heiche Gmbh Korrosionsbeständiges Substrat
DE102006044310A1 (de) * 2006-09-18 2008-03-27 Nano-X Gmbh Silanbeschichtungsmaterial und Verfahren zur Herstellung eines Silanbeschichtungsmaterials
DE102007020404A1 (de) * 2006-09-18 2008-10-30 Nano-X Gmbh Verfahren zur Herstellung eines Beschichtungsmaterials
DE102008014717A1 (de) 2006-09-18 2009-09-24 Nano-X Gmbh Verfahren zur Herstellung eines hoch abriebfesten Fahrzeuglackes, Fahrzeuglack und dessen Verwendung
DE102007021621A1 (de) * 2007-05-09 2008-11-13 Bayer Materialscience Ag Hybride Polyisocyanate
EP2162482B1 (fr) * 2007-06-19 2013-01-16 The University of Akron Procédé monotope pour fabriquer polyisobutylènes à terminaison unique
DE102010004344A1 (de) 2010-01-11 2011-07-14 Viessmann Werke GmbH & Co KG, 35108 Beschichtungsverfahren und Adsorberelement
KR100970461B1 (ko) * 2010-02-09 2010-07-16 엘베스트지에이티 주식회사 유무기 하이브리드 방식 코팅제 조성물 및 그 제조방법
DE102010046281A1 (de) * 2010-09-21 2012-03-22 Ntc Nano Tech Coatings Gmbh Pigmentierte Zweikomponenten-Schutzbeschichtung
WO2013085882A1 (fr) * 2011-12-06 2013-06-13 Dow Corning Corporation Composition de silicone durcissable, matériau durci, articles fabriqués, procédés et utilisations
DK178553B1 (en) * 2014-04-25 2016-06-13 Teknologisk Inst Temperature fluctuation and temperature gradient resistant coating composition having also corrosion inhibiting properties, method for making the coating and use thereof
WO2017097302A1 (fr) 2015-12-08 2017-06-15 Teknologisk Institut Installation ou équipement de traitement comprenant un article avec un revêtement permettant d'inhiber les dépôts de struvite, et procédé de fabrication et d'utilisation de celui-ci
CN109071694A (zh) * 2016-05-10 2018-12-21 横滨橡胶株式会社 紫外线固化型树脂组合物、固化被膜以及叠层体
EP3336219B1 (fr) * 2016-12-19 2019-04-17 Henkel AG & Co. KGaA Procédé de prétraitement de protection anticorrosion et de nettoyage de composants métalliques
CN107779030B (zh) * 2017-11-10 2019-10-25 重庆大学 一种高强铝合金耐久性超双疏表面的制备方法
CN113956424B (zh) * 2021-11-26 2023-06-09 广州海豚新材料有限公司 具有抗涂鸦功能的阴离子水性聚氨酯的制备方法
CN116396464B (zh) * 2023-05-10 2024-04-16 杭州美高华颐化工有限公司 一种异佛尔酮二异氰酸酯封端嵌段硅油的制备方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3135184A1 (de) 1981-09-05 1983-03-17 Bayer Ag, 5090 Leverkusen Beschichtungen fuer thermoplaste
US4745028A (en) * 1985-03-29 1988-05-17 Ppg Industries, Inc. Sized glass fibers and reinforced polymers containing same
FR2581650B1 (fr) * 1985-05-13 1987-09-18 Celliose Sa Vernis a haute durete, resistant a l'abrasion, procede pour leur preparation, et application de ces vernis au revetement de substrats solides
US4847319A (en) * 1988-05-23 1989-07-11 The B. F. Goodrich Company Sealant compositions or coating mixtures containing functional silane or siloxane adhesion promotors nonreactive with blocked isocyanates
US5328975A (en) 1993-04-02 1994-07-12 Ppg Industries, Inc. Ultraviolet radiation absorbing coating
DE19839682A1 (de) 1998-09-01 2000-03-02 Degussa Verfahren zur Herstellung oberflächenversiegelter Hohlglasbehälter mit hoher Gebrauchsfestigkeit
DE19909894A1 (de) 1999-03-06 2000-09-07 Basf Coatings Ag Sol-Gel-Überzug für einschichtige oder mehrschichtige Lackierungen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03037947A3 *

Also Published As

Publication number Publication date
US7776148B2 (en) 2010-08-17
WO2003037947A2 (fr) 2003-05-08
WO2003037947A3 (fr) 2003-07-03
DE10152853A1 (de) 2003-05-15
US20040097641A1 (en) 2004-05-20

Similar Documents

Publication Publication Date Title
EP1474463A2 (fr) Melange durcissable a base d'hydrolysats d'organosilanes et de polyisocyanates bloques
EP0872499B1 (fr) Liants aqueux à deux composants et leur utilisation
EP2385076B1 (fr) Procédé de fabrication d'un matériau de revêtement
EP1006131B1 (fr) Préparations de revêtement hybride
EP1527144B1 (fr) Materiau de revetement, procede de production et utilisation associes
EP3263616B1 (fr) Moyens de revêtement fonctionnalisés par un alkoxysilane et contenant un allophanate
EP2134798B1 (fr) Agents de revêtement comportant des produits d'addition à fonctionnalité silane et revêtements résistants aux rayures produits au moyen de ces agents de revêtement et présentant une meilleure résistance aux craquelures
EP1356004A1 (fr) Liant polyurethane a deux composants utilise comme agent adhesif
EP0678536A1 (fr) Dispersion aqueuse à partir de résines de polymère-polyuréthane, procédé pour sa préparation, revêtements et leur utilisation
DE3828098A1 (de) Verfahren und zusammensetzung zur herstellung von kratzfesten materialien
EP1549692A1 (fr) Nanoparticules, procede de modification de leur surface, dispersion de telles nanoparticules, leur procede de production et leur utilisation
DE2914427A1 (de) Beschichtung fuer thermoplasten
WO1999011725A1 (fr) Composition de recouvrement a base de silanes contenant des groupes epoxyde
EP1355576A1 (fr) Enveloppe protectrice ayant une structure de revetement a deux couches
DE3135184A1 (de) Beschichtungen fuer thermoplaste
DE3836815C2 (fr)
DE2845514A1 (de) Isocyanatgemisch und seine verwendung als bindemittel in einkomponenten-lacken
EP1645601B1 (fr) Couches de finition hybride
DE10331787A1 (de) NCO-haltige Verbindungen mit kovalent gebundenen polyedrischen oligomeren Silizium-Sauerstoffclustereinheiten
DE19950383A1 (de) Beschichtungszusammensetzung auf Basis organisch modifizierter anorganischer Kondensate
DE3917535A1 (de) Verfahren zur herstellung kratzfester materialien und zusammensetzung hierfuer
EP1050551B1 (fr) Systèmes PUR à deux composants ayant une résistance à la corrosion et adhésion améliorée
EP2475698B1 (fr) Mélange à base de liant et agent de revêtement ainsi que revêtements obtenus à partir de ce dernier, présentant une résistance élevée à la rayure, une grande stabilité aux intempéries et de bonnes propriétés optiques
EP2619276A1 (fr) Revêtement de protection pigmenté à deux composants
US20190300722A1 (en) Binders stabilized in an aqueous phase

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20030625

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20080502