EP2160239A1 - Catalyseur de durcissement - Google Patents

Catalyseur de durcissement

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Publication number
EP2160239A1
EP2160239A1 EP08758744A EP08758744A EP2160239A1 EP 2160239 A1 EP2160239 A1 EP 2160239A1 EP 08758744 A EP08758744 A EP 08758744A EP 08758744 A EP08758744 A EP 08758744A EP 2160239 A1 EP2160239 A1 EP 2160239A1
Authority
EP
European Patent Office
Prior art keywords
silane
nanoparticles
zinc oxide
use according
nanoscale zinc
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Withdrawn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
EP08758744A
Other languages
German (de)
English (en)
Inventor
Matthias Koch
Sabine Renker
Gerhard Jonschker
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.)
Merck Patent GmbH
Original Assignee
Merck Patent 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 Merck Patent GmbH filed Critical Merck Patent GmbH
Publication of EP2160239A1 publication Critical patent/EP2160239A1/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Withdrawn legal-status Critical Current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
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/04—Compounds of zinc
    • C09C1/043—Zinc oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/06—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of zinc, cadmium or mercury
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/03—Precipitation; Co-precipitation
    • B01J37/036—Precipitation; Co-precipitation to form a gel or a cogel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G9/00—Compounds of zinc
    • C01G9/02—Oxides; Hydroxides
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • 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
    • C08K9/00—Use of pretreated ingredients
    • C08K9/02—Ingredients treated with inorganic substances
    • 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
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C08K9/06—Ingredients treated with organic substances with silicon-containing compounds

Definitions

  • the invention relates to the use of nanoscale zinc oxide, prepared by a sol-gel process, as a curing catalyst, in particular for wet paints.
  • paints essentially consist of binders (polymer resins), solvents, fillers and pigments as well as auxiliaries, also called additives. Clearcoats contain no pigments.
  • the binders are responsible for film formation and film properties. The pigments give the paint its color, while fillers are approximately "optically neutral” and affect various Lackfileigenschaften (including hardness, durability, sandability).
  • Adjuvants are intended to improve certain paint and coating film properties and serve, inter alia, as driers, defoamers, leveling agents, light stabilizers.
  • wet paints can be differentiated according to different, fundamental criteria. A possible distinction can be made in one-component and two-component systems.
  • the varnish contains all the components required for film formation.
  • 2-component systems consist of a stock paint and a hardener, which is added shortly before processing.
  • 2-component paints can cease at room temperature and are usually chemically and mechanically more stable than 1-component systems.
  • DBTL dibutyl tin dilaurate
  • Soluble tin compounds in particular organo-tin compounds are harmful to health. Replacement of these compounds is therefore desirable.
  • Another disadvantage of organometallic catalysts is their migration in the finished product, ie they can be released to the environment.
  • Another disadvantage is the odor of the organometallic compound, which can be a nuisance during production, but also in the final product. In Aminvemetzenden systems, a reduction in the amount of amine is desirable because the amines can adversely affect the weathering stability of the coatings.
  • the object of the invention was therefore to provide a curing catalyst which is effective in the various wet paint systems, is not migrated and odorless.
  • This object is surprisingly achieved by the inventive use of nanoscale zinc oxide, prepared by a sol-gel process, as a curing catalyst. Due to the catalytic effect of the zinc oxide nanoparticles, a shortening of the time necessary for the curing of the coating system is observed.
  • the invention therefore relates to the use of nanoscale zinc oxide, prepared by a sol-gel process, as a curing catalyst.
  • Nanoscale in the sense of the present invention means essentially spherical with respect to the zinc oxide particles according to the invention. These particles are particularly preferably in the transparent application range up to 25 nm.
  • the paint add.
  • the addition to the paint system takes place as a dispersion containing nanoscale zinc oxide.
  • a preferred embodiment of the invention is therefore the use of nanoscale zinc oxide, prepared by a sol-gel process, characterized in that the nanoscale zinc oxide in a dispersion of the system to be cured, i. especially the
  • the dispersion can be formed directly during the production of the zinc oxide nanoparticles, or by redispersion of isolated zinc oxide nanoparticles.
  • a non-solvent poor dispersant
  • filter and wash then disperse in a good dispersant.
  • nanoscale zinc oxide is used synonymously also for “zinc oxide nanoparticles”.
  • the nanoscale zinc oxide used in the invention consists of ZnO particles having an average particle size determined by particle correlation spectroscopy (PCS) of 1 to 500 nm.
  • the particles according to the invention have an average
  • Particle size determined by particle correlation spectroscopy (PCS) or by a transmission electron microscope, from 2 to 100 nm, preferably from 3 to 20 nm.
  • nanoscale zinc oxide is used according to the invention, wherein the nanoscale zinc oxide is surface-modified with at least one silane. It will be hydrophobicizing and optionally additionally functional silanes used for surface modification of the nanoscale zinc oxide.
  • the choice of silanes is made according to the properties of the paint.
  • a suitable functionalization is characterized by the fact that it favors the incorporation and homogeneous distribution of the particles. The homogeneous distribution is important for the optimal catalytic effect.
  • nanoscale zinc oxide is used according to the invention, characterized in that it is produced by a process in which one or more precursors for the ZnO nanoparticles in an alcohol are converted to the nanoparticles in a step a), in one step b) the growth of the nanoparticles is terminated by the addition of at least one silane when the particle size, determined by the position of the asorption edge in the UV / VIS spectrum, has reached the desired value, optionally in step c) the alcohol from step a) is removed and optionally in step d), an organic solvent is added to obtain a dispersion of the ZnO nanoparticles in an organic solvent.
  • the addition of at least one silane is carried out, as described above, depending on the desired particle size, determined by the position of the absorption edge, but usually 1 to 50 minutes after the beginning of the reaction, preferably 10 to 40 minutes after the start of reaction and more preferably after about 30 min ,
  • the location of the absorption edge in the UV spectrum is dependent on the particle size in the initial phase of zinc oxide particle growth. It is at the beginning of the reaction at about 300 nm and shifts in the direction of time in the direction of 370 nm.
  • the growth can be interrupted at any point.
  • step c) by adding to the reaction mixture a product which is poor for the functionalized particles Dispersant is added, which is homogeneously miscible with the alcohol.
  • Dispersant is added, which is homogeneously miscible with the alcohol.
  • the particles precipitate out and can be filtered off and then taken up in a good dispersant.
  • the possibly resulting salt load remains in the alcohol and can thus be separated.
  • the choice of precipitant is made according to the silane used, under criteria that are known in the art.
  • organofunctional silanes are used.
  • Q Solcherart silane-based surface modifier are described for example in DE 40 11 044 C2.
  • Suitable silanes are, for example, vinyltrimethoxysilane, aminopropyltriethoxysilane, N-ethylamino-N-propyldimethoxysilane, 3-isocyanatopropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, vinyltriethoxysilane, vinylethyldichlorosilane, vinylmethyldiacetoxysilane, vinylmethyldichlorosilane,
  • 3-glycidyloxypropyltrimethoxysilane, Q-hexadecyltrimethoxysilane or mixtures thereof are commercially available, for example, from ABCR GmbH & Co., Düsseldorf, or from Sivento Chemie GmbH, Dusseldorf.
  • amphiphilic silanes as surface modifiers, as described in WO 2007/059841 on pages 10 to 24.
  • a particularly preferred amphiphilic c silane is ((3-Trimethoxysilanyl-propyl) - arbaminklare-2- (2-hexyl-oxy-ethoxy) -ethyl ester.
  • reaction temperature can be selected in the range between room temperature and the boiling point of the chosen alcohol ⁇ Q.
  • reaction rate can be controlled by suitable
  • the requirements for a surface modifier in particular fulfill a bonding agent which carries two or more functional groups.
  • One group of the adhesion promoter reacts chemically with the
  • Oxide surface of the nanoparticle Here come alkoxysilyl groups (e.g.
  • Methoxy, ethoxysilanes e.g., chloro
  • halosilanes e.g., chloro
  • acidic groups of phosphoric acid or phosphonic acids e.g., OQ phosphonic acid esters.
  • Spacers are the groups described with a second, functional
  • the functional group is preferably acrylate, methacrylate, vinyl, amino, cyano, isocyanate, epoxy, carboxy or hydroxy groups.
  • Phosphoric acid-based surface modifiers include i.a. as Lubrizol® 2061 and 2063 from LUBRIZOL (Langer & Co.). Vinylphosphonic acid or vinylphosphonic acid diethyl ester can also be listed here as adhesion promoters (manufacturer: Hoechst AG, Frankfurt am Main).
  • the nanoscale zinc oxide used according to the invention can also be prepared by the following process, wherein in one step a) one or more precursors for the ZnO nanoparticles in an alcohol are converted to the nanoparticles, in a step b) the growth of Nanoparticles by adding at least one copolymer of at least one monomer having hydrophobic radicals and at least one monomer having hydrophilic
  • step c) the alcohol from step a) is removed and optionally in step d) an organic solvent is added to obtain a dispersion in an organic solvent.
  • Preferred copolymers to be used here show a weight ratio of structural units having hydrophobic radicals to structural units having hydrophilic radicals in the random copolymers in the range from 1: 2 to 500: 1, preferably in the range from 1: 1 to 100: 1 and particularly preferably in the range from 7: 3 to 10: 1.
  • R is hydrogen or a hydrophobic side group, preferably selected from the branched or unbranched alkyl radicals having at least 4 carbon atoms in which one or more, preferably all H atoms may be replaced by fluorine atoms, and
  • R 2 is a hydrophilic side group which preferably contains one or more phosphonate, phosphate, phosphonium, sulfonate, sulfonium,
  • (Quaternary) amine, polyol or polyether radicals, particularly preferably one or more hydroxyl radicals, ran means that the respective groups in the polymer are randomly distributed, and within a molecule -XR 1 and -YR 2 are each several different Can have meanings and the
  • Such polymers and their preparation are described in International Patent Application WO 2005/070979, the disclosure of which relates expressly to the content of the present application.
  • R 2 is preferably a side group - (CH 2 ) m- (N + (CH 3) 2) - (CH 2 ) n -SO 3 ' or a side group - (CH 2 ) m - (N + (CH 3 ) 2) - (CH 2 ) n-PO 3 2 ' , - (CH 2 ) m -
  • At least one structural unit of the copolymer has a phosphonium or sulfonium radical.
  • Random copolymers can be prepared according to the following scheme:
  • LMA lauryl methacrylate
  • DMAEMA dimethylaminoethyl methacrylate
  • LMA lauryl methacrylate
  • HEMA hydroxyethyl methacrylate
  • copolymers to be used may include styrene, vinylpyrrolidone, vinylpyridine, halogenated styrene or methoxystyrene, these examples being not limiting.
  • polymers are used, which are characterized in that at least one structural unit is an oligo- or polymer, preferably a macromonomer, with polyethers, polyolefins and polyacrylates being particularly preferred as macromonomers.
  • further structural units in addition to the at least one structural unit having hydrophobic radicals and the at least one structural unit having hydrophilic radicals, further structural units, preferably those contain no hydrophilic or hydrophobic side chains or with short side chains, such as C 4 alkyl.
  • the location of the absorption edge in the UV spectrum is dependent on the particle size in the initial phase 5 of the zinc oxide particle growth. It is at the beginning of the reaction at about 300 nm and shifts in the direction of time in the direction of 370 nm.
  • the growth can be interrupted at any point.
  • step a) in the process described above is carried out in an alcohol. It has proven to be advantageous if the alkokhol is selected so that the copolymer used according to the invention is soluble in the alcohol itself.
  • methanol or ethanol is suitable.
  • step a) has thereby proven ethanol.
  • the addition of the copolymer takes place in the specified method, as described above, depending on the desired absorption edge, but usually 1 to 120 minutes after the start of the reaction, Q preferably 5 to 60 minutes after the start of reaction and particularly preferably after 10 to 40 minutes.
  • the nanoscale zinc oxide used according to the invention can be dispersed, also prepared in an organic solvent, 5 by the following process, in which one or more precursors for the nanoparticles in an organic solvent with a compound M 3 . ⁇ [ ⁇ 3 - ⁇ SiRi + x] are converted to the nanoparticles, wherein x is an integer selected from 0, 1 or 2, M is H, Li, Na or K and all R are each independently Q of one another are a branched or unbranched, saturated or unsaturated hydrocarbon radical having 1 to 28 C atoms in which one or more C atoms may be replaced by O.
  • This method of preparation allows economical production of the particles, since higher solids contents can be achieved in the product suspension, than using the usual hydroxide bases.
  • the compound M 3 -x [O 3 . x SiRn- x ] can also be a better
  • Compatibilizing in the present application here means to functionalize the particles such that a conversion into organic, hydrophobic
  • Solvent as is the case for many applications (for example in paints), becomes possible. This can be done, for example, by suitable hydrophobic silanes.
  • a base MOH where M is Li, Na or K can be used, wherein the proportion of the base in the total amount of M3.
  • x [ ⁇ 3 - x SiRi + x ] and base can be up to 99.5%.
  • the proportion of base is preferably 10-70 mol% based on the total amount or particularly preferably 30-60 mol%.
  • At least one radical R is an alkoxy group having 1 to 27 carbon atoms, preferably a methoxy or ethoxy radical.
  • x is 2 and all R are each independently methyl or ethyl.
  • M 3 - x [ ⁇ 3-x SiRi + x ] all R are each independently methyl, ethyl, methoxy or ethoxy. It may furthermore be preferred for M to be K. It is particularly preferred for x to be 2 and the formula of the abovementioned compounds accordingly simplified to M [OSiR 3 ]. Very particularly preferred is the use of compounds of the formula K [OSiRaCH 3 ], where R is as indicated above, where all R are preferably methyl.
  • Li, Na or K and x and R have the abovementioned meaning, is generated in situ from a base MOH and a compound R ' 3 -x [O 3 - ⁇ SiRi + x ], where R' is an alkyl group having 1 to 16 C -Atomen, preferably having 1 to 4 carbon atoms, most preferably ethyl.
  • zinc salts can be used in all the processes described. Preference is given to using zinc salts of the carboxylic acids or halides, in particular zinc formate, zinc acetate or zinc propionate and also zinc chloride. Very particularly preferred
  • the conversion of the precursors to the zinc oxide in the described process is preferably carried out in the basic, wherein in a preferred process variant, a hydroxide base, such as LiOH, NaOH or KOH 2Q is used.
  • a hydroxide base such as LiOH, NaOH or KOH 2Q is used.
  • the nanoscale zinc oxide produced by the above-described processes can be used as a curing catalyst for wet paint systems.
  • the nanoscale zinc oxide acts p c as a curing accelerator for condensation systems, ie in systems in which ester or amide bonds are generated and / or in addition systems, for example in urethane formation.
  • Hardening catalysis particularly preferably takes place in 2K PU paints.
  • a 2K PU system consists of a binder and a hardener.
  • Particularly suitable binders are polyacrylate, polyester or polyether polyols.
  • the hardeners used are preferably polyisocyanates the basis HDI (hexamethylene diisocyanate), IPDI (isophorone diisocyanate) or TDI (2,4- and 2,6-toluene diisocyanate) used.
  • polyacrylate polyols Particularly preferred here are polyacrylate polyols.
  • the nanoscale ZnO preparable via the previously described method, homogeneously incorporated into the coatings and has in the usual use concentration of 0.01 to 0.1 wt .-%, but also significantly beyond, no negative influence the transparency of the paints.
  • the surface modification of the particles can be designed so that when curing takes place an integration into the paint and thus migration is impossible, as can occur in molecular compounds such as DBTL and zinc salts.
  • the nanoscale zinc oxide produced by the above-described processes can be used as a curing catalyst for silane-functional paints, adhesives and / or sealants, in particular for silyl-terminated paint binders, for example the polyorganosilsesquioxanes known and often described as "ormocers" or “nanomers", or copolymers, for example polyacrylates, which have been prepared with, inter alia, methacryloxypropyltrimethoxysilane or other silanes with polymerizable double bonds as monomer.
  • silyl-terminated paint binders for example the polyorganosilsesquioxanes known and often described as "ormocers" or “nanomers”, or copolymers, for example polyacrylates, which have been prepared with, inter alia, methacryloxypropyltrimethoxysilane or other silanes with polymerizable double bonds as monomer.
  • the nanoscale zinc oxide produced by the above-described processes can be used as a curing catalyst in coating formulations which, in addition to the conventional coating components, also contain further nanoparticles or nanoparticles.
  • the nanoparticles are particles consisting essentially of oxides or hydroxides of silicon, cerium, cobalt, chromium, nickel, zinc, titanium, iron, yttrium, zirconium or mixtures thereof, wherein the particles are preferably SiO 2 particles as an additional component in the paint formulation.
  • the nanoparticles ideally bear a surface modification, which ensures the incorporation into the paint system. Suitable surface-modified SiO 2 particles are known from the literature.
  • nanoscale zinc oxides can generally be used as a substitute for organotin compounds such as DBTL.
  • DBTL is used in the production of polyurethanes or in textile dyeing and finishing
  • a disadvantage in addition to the great toxicity of DBTL is the smell, which can be annoying during production but also in the final product and the ability to migrate in the finished product.
  • nanoscale zinc oxide prepared by the methods described above, as a substitute for DBTL are now curing catalysis
  • esterification processes in general, for example for the production of cosmetic oils, lubricants, plasticizers, surfactants or paint binders, such as polyesters, polyester polyols, polylactides, polycaprolactones or alkyd resins;
  • Epoxides with amines, acids or other reactants which are used as adhesives and sealants or, in particular, for the production of glass and carbon fiber reinforced plastics for vehicle and aircraft construction; - in the case of moisture-curing or addition-crosslinking silicones;
  • the curing catalyst is preferably a component of the binder component and is used in the same way as an additive, such as DBTL.
  • the measurements are carried out with a Zetasizer Nano ZS from Malvern at room temperature.
  • the measurement is carried out at a laser wavelength of 532 nm.
  • the sample volume is in all cases 1 ml at a concentration of 0.5% by weight of particles in butyl acetate.
  • the solutions are filtered with a 0.45 ⁇ m filter.
  • a Tecnai 2OF made by Fei Company with field emission cathode is used.
  • the recordings are made at 200 kV acceleration voltage.
  • the solution containing the nanoparticles is diluted to 1 wt .-% and dropped a drop of this solution on a kohlebefilmtes Cu netting and then immediately "sucked dry” with a filter paper, (blotting off excess solution). The measurement of the sample takes place after drying at room temperature for one day.
  • the particle dispersion is mixed with the paint, so that the ZnO content after drying the paint layer is 5%.
  • the paint is cured in a thick layer in a teflon pan, so that at least 2mm thick, free-standing films are formed. These samples are ultramicrotomed without embedding; at room temperature with 35 ° diamond knife, cutting thickness 60 nm.
  • the sections are suspended in water and transferred to coal-coated Cu nets and measured.
  • LMA lauryl methacrylate
  • HEMA hydroxyethyl methacrylate
  • AIBN azoisobutyronitrile
  • the conversion to zinc oxide and the growth of the nanoparticles can be monitored by UV spectroscopy. After only one minute reaction time, the absorption maximum remains constant, ie. ZnO formation is completed in the first minute. The absorption edge shifts with increasing reaction time to longer wavelengths. This can be correlated with sustained growth of ZnO particles by Ostwald ripening.
  • Example 1 added. After the addition, no further shift in the absorption edge is observed any more. The suspension remains stable and transparent for several days.
  • a comparative experiment without addition of the polymer solution shows continued particle growth and becomes cloudy on continued observation.
  • the ethanol is removed in vacuo and the remaining cloudy residue is dissolved in butyl acetate.
  • the resulting in the reaction potassium acetate can be separated as a precipitate.
  • the supernatant clear solution also shows in the UV spectrum the characteristic absorption of zinc oxide.
  • the two zinc oxides prepared according to the invention have the most intensive catalytic activity.
  • a clear clouding of the lacquer layer is evident.
  • Example 3b Guideline formulation CAS-EMEA-BD-ICO for the car repair application (2-component PU lacquer, main constituents: polyacrylate and aliphatic polyisocyanate (low-viscosity HDI trimer))
  • a concentration of 0.0174 wt .-% curing catalyst is provided for the used automotive refinish formulation from Bayer .
  • the pot life is determined for this concentration and for 0.01 wt .-%.
  • nanoscale zinc oxide prepared according to Examples 2a or 2b and also ZnO commercial goods (Merck, zinc oxide, very pure, Art. No .: 108846) are used.
  • lacquer layers are applied by air spraying at the layer thickness of 40 microns, dry, applied and cured for 30 min at room temperature and then at 60 0 C for 30 min.
  • Table 2 Pot lives when using different catalysts
  • the zinc oxides prepared according to Example 2a or 2b have a significantly better catalytic activity, as the zinc oxide merchandise.
  • Example 3c Guideline RR 4822 A, Bayer, for use on plastics (2-component PU lacquer, main constituents: polyester / polyacrylate and aliphatic polyisocyanate (HDI trimer))
  • Pot life is for this concentration both for nanoscale zinc oxide, prepared according to Example 2a or 2b, as well as for ZnO commercial goods (Fa.
  • the lacquer layers are evaporated by air spraying at a thickness of 40 microns, dry, applied, 10 min at room temperature and then cured at 100 0 C for 40 min.
  • the zinc oxides prepared according to Examples 2a and 2b have a significantly better catalytic activity than the zinc oxide commercial product.
  • Borchi® Kat 0244 is a mixture of a bismuth salt of 2-ethylhexanoic acid and zinc salts of various branched fatty acids.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Nanotechnology (AREA)
  • Physics & Mathematics (AREA)
  • Wood Science & Technology (AREA)
  • Composite Materials (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

L'invention concerne l'utilisation d'oxyde de zinc nanométrique, fabriqué par un procédé sol-gel, en tant que catalyseur de durcissement, notamment pour des laques humides.
EP08758744A 2007-06-22 2008-05-23 Catalyseur de durcissement Withdrawn EP2160239A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007032189A DE102007032189A1 (de) 2007-06-22 2007-06-22 Härtungskatalysator
PCT/EP2008/004153 WO2009000378A1 (fr) 2007-06-22 2008-05-23 Catalyseur de durcissement

Publications (1)

Publication Number Publication Date
EP2160239A1 true EP2160239A1 (fr) 2010-03-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08758744A Withdrawn EP2160239A1 (fr) 2007-06-22 2008-05-23 Catalyseur de durcissement

Country Status (4)

Country Link
US (1) US20100190637A1 (fr)
EP (1) EP2160239A1 (fr)
DE (1) DE102007032189A1 (fr)
WO (1) WO2009000378A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2393883B1 (fr) 2009-02-03 2013-04-17 Bühler PARTEC GmbH Particules d'oxyde de zinc modifiées par de l'acide phosphonocarboxylique et utilisation de particules d'oxyde de zinc
EP2241602A1 (fr) 2009-04-17 2010-10-20 Bühler PARTEC GmbH Particules d'oxyde de zinc modifiées à l'aide d'acide de carbone phosphonique et utilisation de particules d'oxyde de zinc
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