EP2178988A1 - Système de revêtement aqueux filmogène sans résidus pour surfaces métalliques à base de silane - Google Patents

Système de revêtement aqueux filmogène sans résidus pour surfaces métalliques à base de silane

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Publication number
EP2178988A1
EP2178988A1 EP08804313A EP08804313A EP2178988A1 EP 2178988 A1 EP2178988 A1 EP 2178988A1 EP 08804313 A EP08804313 A EP 08804313A EP 08804313 A EP08804313 A EP 08804313A EP 2178988 A1 EP2178988 A1 EP 2178988A1
Authority
EP
European Patent Office
Prior art keywords
functional
ethyl
group
polysiloxanes
propyl
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Withdrawn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
EP08804313A
Other languages
German (de)
English (en)
Inventor
Björn BORUP
Burkhard Standke
Christian Wassmer
Martin Nader
Christian Junker
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.)
Evonik Operations GmbH
Original Assignee
Evonik Degussa 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 Evonik Degussa GmbH filed Critical Evonik Degussa GmbH
Publication of EP2178988A1 publication Critical patent/EP2178988A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
    • C08G77/26—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen nitrogen-containing groups
    • 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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • 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
    • C23C22/82—After-treatment
    • C23C22/83—Chemical after-treatment
    • 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
    • C23C2222/10—Use of solutions containing trivalent chromium but free of hexavalent chromium
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D2055/0004—Parts or details of disc brakes
    • F16D2055/0016—Brake calipers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2250/00—Manufacturing; Assembly
    • F16D2250/0038—Surface treatment
    • F16D2250/0046—Coating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31652—Of asbestos
    • Y10T428/31663—As siloxane, silicone or silane

Definitions

  • Residue-free, layer-forming, aqueous sealing system for metallic silane-based surfaces Residue-free, layer-forming, aqueous sealing system for metallic silane-based surfaces
  • the invention relates to a composition for coating metallic surfaces containing water-soluble, substantially completely hydrolyzed polysiloxanes having amino-functional groups and vicinal dihydroxyalkyl-functional and / or epoxy-functional groups, a process for their preparation, the use of the composition for the treatment of metallic surfaces, as well as with it treated components, in particular brake calipers.
  • Metal-coated components in particular coated with zinc or zinc alloys, are frequently passivated and subsequently sealed.
  • Suitable sealants are water glass, organic compounds such as acrylates, polyurethanes or epoxides, as well as mixtures of these with titanic acid esters, titanium chelates or even silanes.
  • Silanes are usually used in mixtures with titanic acid esters in organic solvent mixtures, as described in DE 41 38 218 A1.
  • DE 198 14 605 A1 relates to an aqueous sealant based on silane dehydrates in the presence of colloidal silica and / or colloidal silicate.
  • DE 10 2004 037 045 A1 also discloses an aqueous composition based on the reaction of glycidyloxypropylalkoxysilanes, an aqueous silica sol, an organic acid and a crosslinking agent.
  • a disadvantage of the said seals is their lack of chemical resistance to aggressive solvents such as glycols or even the formation of abrasive residues after curing of the silane systems.
  • aggressive solvents such as glycols or even the formation of abrasive residues after curing of the silane systems.
  • organic solvents are undesirable for many reasons. These include the VOC directive, an increased risk of fire and health risks in the processing of solvent-based sealing systems, which are particularly due to their increased volatility when, for example, has to be worked for crosslinking at elevated temperatures.
  • the lack of chemical resistance of organically based systems has hitherto precluded their application to components operated in said aggressive solvents. An example of this are brake parts operated in glycol-based systems.
  • the task was to develop a sealing system for metallic surfaces based on aqueous silane systems, which does not form particulate residues and has increased chemical resistance.
  • the system should be free of organic solvents.
  • the sealing system according to the invention for coating metallic surfaces is a composition containing water-soluble, substantially completely hydrolyzed polysiloxanes having amino-functional groups and vicinal dihydroxyalkyl-functional and / or epoxy-functional groups and water, optionally containing acid and / or optionally auxiliaries and wherein each silicon in the polysiloxanes at least one functional group, in particular, the composition is substantially free of organic solvents.
  • compositions are based on substantially fully hydrolyzed polysiloxanes having amino-functional groups and vicinal dihydroxy-functional groups and / or groups derived therefrom, water, optionally an acid and / or at least one adjuvant, each silicon in the polysiloxanes carrying at least one functional group, and the composition is substantially free of organic solvents.
  • the composition is free of fluorofunctional siloxanes.
  • the polysiloxanes of the invention are preferably aqueous composition free of alkoxy groups and are present as functionalized siloxanes with silanol groups.
  • a composition is considered substantially free of organic solvents, which also include alcohols, if the content of solvents is less than 5% by weight, preferably less than 1% by weight, particularly preferably less than 0.5% by weight. or even less than 0.1% by weight.
  • Dihydroxyalkyl-functional groups are also understood as meaning dihydroxyalkyl ether-functional groups.
  • the polysiloxanes according to the invention can react or crosslink via the amino-functional groups with a metallic surface or else with a metallic passivation layer; in particular, the amino-functional polysiloxanes can react with oxidic chromium (III) compounds.
  • the polysiloxanes via the silanol functions a condensation reaction with corresponding hydroxyl functions on a metallic surface or on a
  • the polysiloxanes in the composition have amino-functional groups of general formula Ia,
  • one Benzyl or vinyl group correspond, in particular, the polysiloxanes as further functional groups linear, branched and / or cyclic alkyl groups having 1 to 16 carbon atoms or alkenyl groups, for example vinyl groups, wherein as alkyl groups methyl Ethyl, propyl and / or n-octyl are preferred, and / or the polysiloxanes have as vicinal dihydroxyalkyl-functional or epoxy-functional groups glycidyloxypropyl, 3- (2,3-dihydroxypropoxy) propyl, 2- (3,4 Epoxycyclohexyl) ethyl or 2- (3,4-dihydroxycyclohexyl) ethyl groups.
  • composition according to the invention contains polysiloxanes which are based on the reaction of siloxanes with N-2. Aminoethyl-3-aminoproply groups and methyl groups on silicon and siloxanes with Glycidoxypropyl- and / or in particular with 3- (2,3-dihydroxypropoxy) propyl groups based.
  • the amino-functional siloxanes can be obtained by a reaction of N-2-aminoethyl-3-aminopropyl-methoxysilane and methyltriethoxysilane in the presence of water and optionally an acid and subsequent removal of the alcohols.
  • Further aminofunctional siloxanes are based, for example, on the reaction of 3-aminopropylthethoxysilane, 3-aminopropylmethyldiethoxysilane or on the reaction of 3-aminopropylthethoxysilane with an alkyl-functional alkoxysilane, such as methyltriethoxysilane or on the reaction of aminopropyltriethoxysilane with a vinyl-functional alkoxysilane in the presence of water and optionally an acid and subsequent removal of the alcohols.
  • an alkyl-functional alkoxysilane such as methyltriethoxysilane
  • aminopropyltriethoxysilane with a vinyl-functional alkoxysilane in the presence of water and optionally an acid and subsequent removal of the alcohols.
  • a siloxane substituted by 3-glycidyloxypropyl and / or in particular by 3- (2,3-dihydroxypropoxy) -propyl groups can be prepared by hydrolysis and condensation of 3-glycidyloxypropyltrimethoxysilanes or 3-glycidyloxypropyltriethoxysilanes in the presence of a water / acid mixture and then removing the alcohol.
  • the aminofunctional and 3- (2,3-dihydroxypropoxy) propyl-functional and / or 3-glycidoxypropyl-functional, water-soluble siloxanes formed may be reacted together to form the compositions of the invention containing water-soluble polysiloxanes.
  • compositions are based on the reaction of Hydrosile 2776 (co-condensate of diaminoalkoxysilane and methylalkoxysilane), Hydrosil 2781 (Co condensate of aminoalkoxysilane and vinylalkoxysilane), Hydrosil 2627 (Co condensate of aminoalkoxysilane and alkylalkoxysilane) and / or Hydrosil 1151 (product of Aminopropylthalkoxysilane) with the hydrosils 2926 (product of epoxyalkoxysilane) and / or 2759 (product of epoxyalkoxysilane with glycol as additive) of Degussa.
  • Hydrosile 2776 co-condensate of diaminoalkoxysilane and methylalkoxysilane
  • Hydrosil 2781 Co condensate of aminoalkoxysilane and vinylalkoxysilane
  • Hydrosil 2627 Co condensate of aminoalkoxysilane and
  • compositions have a pH greater than 8, in particular between 8 and 10, more preferably between 8.5 and 10, in particular the pH is not adjusted by adding alkali metal or alkaline earth metal compounds.
  • the composition is thus free of alkali and alkaline earth compounds.
  • the compositions have a particular content of polysiloxanes which is particularly suitable for use on metallic surfaces. Because only with this content of polysiloxanes, a formation of clear, crack-free and / or particle-free coatings can be realized.
  • This content of polysiloxanes in the composition is from 0.5 to 20% by weight, in particular from 1.5 to 10, preferably from 2.5 to 5% by weight.
  • the composition comprising polysiloxanes having amino-functional groups and vicinal dihydroxyalkyl-functional and / or epoxy-functional groups is free of colloids and / or silicates.
  • a composition is considered to be free from silica sols, i. free of colloidal, amorphous silica.
  • the composition is free of colloids with particles in the range from 400 to 1000 nm, in particular the particles in the composition are smaller than 35 nm and / or are between 0.5 and 35 nm, preferably between 0.5 and 25 nm.
  • the determination The particle size distribution can be carried out in a conventional manner by means of laser diffraction (Coulter LS particle size measuring device).
  • compositions are in the form of a clear liquid.
  • the compositions obtained are stable in the mixture according to the invention, in particular with the corresponding contents of polysiloxanes for months at room temperature and processable. If, for example, immersed in a bath composition based on purely amino-functional substituted siloxanes, treated with a conventional metal pretreatment solution, metallic component, so precipitations form in the composition that make them largely unusable within hours.
  • glycidoxypropylalkoxysilanes are used alone in a dilute aqueous mixture, significantly lower corrosion protection is achieved than with the mixture according to the invention.
  • the composition according to the invention was developed in order to form a chemically particularly resistant layer as corrosion protection on metallic surfaces, passivations, in particular Cr (III) -containing passivations, particularly preferably with Cr (III) oxides.
  • Chemical resistance is of particular interest to components that must be operated in aggressive solvents, such as brake fluids, to improve the life of the components.
  • a coating quickly cracks or is completely destroyed.
  • the corrosion protection of metallic, such as iron-containing components is usually carried out by coating the base metal, such as iron, with a coating metal, such as zinc or with a zinc alloy, such as Zn-Fe, Zn-Co or Zn-Ni alloys, hereinafter a Passivation applied.
  • the passivation is usually done with cobalt (Co) containing Cr (III) oxides in which zinc can be dissolved from the coating metal.
  • Co cobalt
  • Cr (III) oxides in which zinc can be dissolved from the coating metal.
  • the composition according to the invention is applied for sealing to this layer system, in order to obtain a chemical crosslinking of the polysiloxanes with the chromium-lll-containing passivation layer, particularly preferably with Cr (III) oxides, in which also Co compounds and Zn compounds be solved can form a chemically and mechanically extremely resistant layer.
  • the polysiloxanes in the composition of the invention are characterized in that they are based on condensed amino-functional siloxanes and vicinal dihydroxyalkyl-functional siloxanes, optionally also have Amine reacts with the diols in the mix. These polysiloxanes in turn react or crosslink for example via the amino function with the metallic surface and / or via the silanol groups with the hydroxyl groups under condensation reactions and formation of a strong chemical crosslinking and formation of a layer with the metallic surfaces, ie the polysiloxanes according to the invention crosslink to form a layer with the metallic surfaces. It is particularly preferred if the polysiloxanes crosslink with Cr (III) compounds, more preferably with Cr (III) oxides.
  • the compounds based on amino-functional siloxanes react with an oxidic chromium (III) compound.
  • the protective mechanism consists in the formation of an organo-silicate conversion layer on the passivation. It is particularly preferred that this layer is free of particulate residues.
  • particulate residues are colloids, namely silica sols (SiO2), and / or inorganic silicates, such as lithium polysilicate understood, especially if their solid particles have dimensions in the range of 400 to 1000 nm, in particular well above 40 nm.
  • composition may also contain other additives or adjuvants.
  • additives of colors, friction-influencing agents, wetting agents, defoamers, buffers or organic binders are possible.
  • the invention also provides a process for the preparation of a composition according to the invention.
  • the process comprises the reaction of substantially completely hydrolyzed amino-functional siloxanes with epoxy-functional and / or vicinal dihydroxyalkyl-functional siloxanes, where the amino-functional siloxanes are based on the reaction of A mol of aminoalkylalkoxysilanes of the general formula I
  • R 4 is a linear, branched or cyclic alkyl group having 1 to 16 carbon atoms or an alkenyl group, in particular a vinyl group and R 3 of a
  • Methyl, ethyl, propyl or iso-propyl group correspond in the molar
  • Ratio of 0 ⁇ A / B ⁇ 2 in the presence of water and optionally in
  • a pH may be between 8 to 11, in particular between 8.5 to 10.0 and more preferably it is between 9.0 and 10.0 , and the removal of the already existing or formed alcohol based; and wherein the vicinal dihydroxy-functional and / or epoxy-functional siloxanes are based on the reaction of with glycidyloxypropyl, 3- (2,3-dihydroxypropoxy) -propyl, 2- (3,4-epoxycyclohexyl) -ethyl and / or 2- (3 , 4-Dihydroxycyclohexyl) -ethyl groups substituted alkoxysilanes of the general formula III
  • R 5 is a 3-glycidyloxypropyl, 3- (2,3-dihydroxypropoxy) propyl, 2- (3,4-dihydroxycyclohexyl) ethyl or 2- (3,4-epoxycyclohexy ) -ethyl group
  • R 6 is a methyl or ethyl group and R 6 * is a methyl, ethyl, propyl or iso-propyl group, in the presence of a water / acid mixture, in particular at a pH Value of 1 to 8, and the removal of the already existing or formed alcohol based.
  • the alcohol is in the context of the two reactions mentioned preferred to a content of less than 5 wt .-%, preferably less than 1 wt .-%, more preferably less than 0.5 wt .-% or even less than 0.1 wt .-% away.
  • the invention further provides a composition obtainable by the reaction of substantially completely hydrolyzed amino-functional siloxanes with vicinal dihydroxyalkyl-functional and / or epoxy-functional siloxanes, according to the abovementioned processes, in particular with a polysiloxane content of from 0.5 to 20% by weight, preferably from 1.5 to 10% by weight, more preferably 2.5 to 5% by weight and / or a pH in the range 8 to 11, preferably 8.5 to 10.
  • These compositions are prior to crosslinking clear and form after crosslinking clear, chemically resistant coatings, which have no cracks or particulate residues out.
  • compositions obtained are stable in the mixture according to the invention, in particular with the corresponding contents of polysiloxanes, in particular also during use as a bath composition for wetting metallic components.
  • conventional amino-functional compositions which are not based on the mixture according to the invention usually form a sediment within hours after being brought into contact with correspondingly pretreated metallic components and render the composition unusable. It is believed that the formation of this sediment is due to a reaction with entrained impurities or residues of a metal pretreatment solution that are processually introduced by the metallic components into a corresponding bath composition.
  • Another object of the invention relates to a composition
  • a composition comprising water-soluble, substantially completely hydrolyzed polysiloxanes, wherein the polysiloxanes of the general formula IV, are derived from the silanes of general formulas I and III and optionally II,
  • R 1 * , R 3 and / or R 6 * are hydrogen, R 1 is a methyl, ethyl, propyl or iso-propyl group, R 4 independently of one another of a linear, branched or cyclic alkyl group having 1 to 16 C atoms and / or an alkenyl group, for example a vinyl group, R 6 is methyl or ethyl, R 8 is derived from R 5 , wherein R 5 is a 3-glycidyloxypropyl, 3- (2,3-dihydroxypropoxy ) -propyl, 2- (3,4-epoxycyclohexy
  • a composition is considered, if the content of solvents less than 5 wt .-%, preferably less than 1 wt .-%, more preferably less than 0.5 wt .-% or even less than 0, 1 wt .-% is.
  • the acid common organic or inorganic acids such as formic acid, acetic acid, nitric acid, hydrochloric acid, phosphoric acid or sulfuric acid can be used.
  • kits comprising a sealing system consisting of a first component and a second component, wherein the first component comprises water-soluble, substantially completely hydrolyzed polysiloxanes of the general formula IVa derived from the silane of the general formula I and optionally II
  • R 1 * O [(R 7 ) Si (R 1 ) a (OR 1 * ) i. a O] h [(R 4) Si (OR 3) O] l (R 3) - (HX) k
  • R 1 * and / or R 3 are hydrogen
  • R 1 is a methyl, ethyl, propyl or iso-propyl group
  • R 4 is independently a linear, branched or cyclic alkyl group having 1 to 16 C atoms and or an alkenyl group, in particular a vinyl group
  • R 7 represent amino-functional group Ia
  • HX is an acid wherein X is an inorganic or organic acid radical and the composition is substantially free of organic solvents, more preferably are polysiloxane co-condensates based on the reaction of N-2-aminoethyl-3-aminopropyl-thalkoxysilanes and methylthalkoxysilanes with 1 ⁇ h and 1
  • the second component comprises water-soluble, substantially completely hydrolyzed polysiloxanes of the general formula IVb derived from the silane of the general formula III
  • Particularly preferred are polysiloxanes based on the reaction of 3-glycidoxypropyl and / or 3- (2,3-dihydroxypropoxy) propyltrialkoxysilanen with 1 ⁇ j.
  • compositions according to the invention can be used for the treatment, modification or coating of metallic surfaces, in particular of surfaces comprising metal oxides and / or metal hydroxides. Claimed is also a process for the production of metallic components, in particular brake calipers, by treating or modifying them with a composition according to the invention.
  • the component or a part thereof is wetted with the composition and, with subsequent crosslinking of the polysiloxane, the curing and formation of a layer or a film takes place on the surface of the component.
  • the wetting of the component or of a part thereof is effected by customary application methods, such as dipping, spraying, dip-spinning, etc.
  • the temperature at which the wetting takes place is not critical; it can be carried out both at room temperature and at elevated temperatures. Preferably, in the range of 5 to 100 0 C, preferably at 15 to 60 0 C worked.
  • the subsequent curing or cross-linking of the polysiloxanes can be performed at 40 to 150 0 C, preferably at 50 to 150 0 C.
  • conventional circulating air or vacuum systems can be used.
  • the invention also relates to components with metallic surfaces, particularly preferred are components having Cr (III) compounds, such as Cr (III) oxides, surfaces containing, in particular brake components, such as calipers, in particular disc brakes.
  • the calipers mentioned are usually installed in common cars. Preferably, they are obtained by the method described above.
  • These components, and more particularly calipers, especially with Cr (III) compounds, Cr (III) oxides containing surfaces are characterized by having a coating based on the crosslinking of polysiloxanes having amino functional groups and vicinal dihydroxyalkylfunktionellen and / or having epoxy functional groups. These surfaces may also contain cobalt and / or zinc.
  • DOT 4 can be based, for example, on the following composition: glycol ethers, glycol ether borate, polyglycols and inhibitors, in particular polyethylene glycol monobutyl ether, Diethylene glycol, diethylene glycol monohexyl ether, diethylene glycol monobutyl ether, diethylene glycol monomethyl ether and aliphatic amines.
  • Dynasylan ® HYDROSIL 2627 and 300 g of Dynasylan ® HYDROSIL 2926 are mixed and 3 600 g of distilled water. After one hour of service, the product can be used.
  • a caliper is immersed in the, as shown in Example 2, passivation solution and removed after about 2 minutes in an immersion bath again from the bathroom. The excess amount of passivation solution is removed by centrifugation. Subsequently, the caliper is dried at 120 0 C. The layer formed from the passivation solution remains clear even after drying, there are no precipitates or particulate residue on the caliper.
  • Example 4 A caliper is immersed in the, as shown in Example 1, passivation solution and removed after about 2 minutes in the dip again from this. Excess passivation solution is removed by dripping. Thereafter, the brake member is dried at about 60 0 C. The layer obtained from the passivation solution on the brake part is clear even after drying, there are no precipitates.
  • FIG. 1 shows two brake calipers with coatings according to examples 3 and 4. These coatings have no particulate residues after crosslinking on the metallic surface of the components. The coatings are clear, free of noses and do not peel off.
  • FIG. 2 shows a sheet after 120 hours salt spray test, in accordance with DIN EN ISO 9227 NSS, which was coated with the composition according to Example 1. Even after damage by rockfall and subsequent salt spray test, this sheet shows no coating corrosion after 216 hours.
  • FIGS. 3 a, 3 b and 3 c show brake calipers with a coating according to Examples 3 and 4, which show no formation of red rust even after a salt spray test according to DIN EN ISO 92277 NSS lasting more than 744 hours.
  • FIG. 1 The optical appearance of coated calipers.
  • Figure 2 A coated sheet with a polysiloxane mixture based on a 1: 1 mixture of Dynasylan ® HYDROSIL 2776 and Dynasylan ® HYDROSIL 2926 after 120 hours salt spray test.
  • Figure 3a Coated calipers after 216 hours salt spray test.
  • Figure 3b Coated calipers after 480 hours salt spray test.
  • Figure 3c Coated calipers after 744 hours salt spray test.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Polymers & Plastics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Paints Or Removers (AREA)
  • Silicon Polymers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

L'invention concerne une composition destinée au revêtement de surfaces métalliques, cette composition contenant des polysiloxanes aqueux sensiblement totalement hydrolysés comportant des groupes à fonction amine et des groupes vicinaux à fonction dihydroxyalkyle et/ou à fonction époxy, un procédé de production de cette composition, l'utilisation de cette composition pour le revêtement de surfaces métalliques, ainsi que des composants traités au moyen de cette composition, en particulier des étriers de frein.
EP08804313A 2007-09-21 2008-09-17 Système de revêtement aqueux filmogène sans résidus pour surfaces métalliques à base de silane Withdrawn EP2178988A1 (fr)

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DE200710045186 DE102007045186A1 (de) 2007-09-21 2007-09-21 Rückstandsfreies, schichtbildendes, wässriges Versiegelungssystem für metallische Oberflächen auf Silan-Basis
PCT/EP2008/062361 WO2009040281A1 (fr) 2007-09-21 2008-09-17 Système de revêtement aqueux filmogène sans résidus pour surfaces métalliques à base de silane

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EP2178988A1 true EP2178988A1 (fr) 2010-04-28

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US (1) US20100209719A1 (fr)
EP (1) EP2178988A1 (fr)
JP (1) JP2010539311A (fr)
KR (1) KR20100061498A (fr)
CN (1) CN101815757A (fr)
DE (1) DE102007045186A1 (fr)
WO (1) WO2009040281A1 (fr)

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CN101815757A (zh) 2010-08-25
DE102007045186A1 (de) 2009-04-09
WO2009040281A1 (fr) 2009-04-02
KR20100061498A (ko) 2010-06-07
US20100209719A1 (en) 2010-08-19

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