EP1084199A2 - Dispersion-vernis en poudre stabilisee de maniere non ionique - Google Patents

Dispersion-vernis en poudre stabilisee de maniere non ionique

Info

Publication number
EP1084199A2
EP1084199A2 EP99917932A EP99917932A EP1084199A2 EP 1084199 A2 EP1084199 A2 EP 1084199A2 EP 99917932 A EP99917932 A EP 99917932A EP 99917932 A EP99917932 A EP 99917932A EP 1084199 A2 EP1084199 A2 EP 1084199A2
Authority
EP
European Patent Office
Prior art keywords
component
agents
dispersion
aqueous
weight
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Withdrawn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
EP99917932A
Other languages
German (de)
English (en)
Inventor
Claudia Sierakowski
Karl-Heinz Grosse-Brinkhaus
Egon Wegner
Thomas Frey
Jürgen Niemann
Joachim Woltering
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.)
BASF Coatings GmbH
Original Assignee
BASF 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
Priority claimed from DE19912661A external-priority patent/DE19912661A1/de
Application filed by BASF Coatings GmbH filed Critical BASF Coatings GmbH
Publication of EP1084199A2 publication Critical patent/EP1084199A2/fr
Withdrawn legal-status Critical Current

Links

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
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • 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
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09D133/062—Copolymers with monomers not covered by C09D133/06
    • C09D133/068—Copolymers with monomers not covered by C09D133/06 containing glycidyl 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
    • C09D5/02—Emulsion paints including aerosols
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
    • C08L75/04—Polyurethanes

Definitions

  • the present invention relates to a non-ionically stabilized powder clearcoat dispersion which is particularly suitable as a coating for automobile bodies coated with waterborne basecoat.
  • Liquid coatings are preferably used today for the coating of automobile bodies. These cause numerous environmental problems due to their solvent content. This also applies to the use of water-based paints.
  • a powder clear coat dispersion is also known, which is composed of two components.
  • the first component comprises epoxy-containing binders, crosslinking agents and catalysts, auxiliaries and additives.
  • the second component is a non-ionic thickener, which may be in a mixture with catalysts, auxiliary substances, defoaming agents, wetting agents, antioxidants, UV adsorbents, radical scavengers, biocides, solvents, leveling agents, neutralizing agents.
  • Carboxy-functional dispersants are preferably used as dispersion aids.
  • the previous powder clearcoats generally contain dispersants based on ionically stabilized polymers. In the case of the wet-on-wet application, these lead to cracks in the clear lacquer. Additional difficulties are the tendency to sediment and the pumpability of the paint dispersion.
  • powder clear coat dispersion is used as a synonym for Puiverkiarlack slurry.
  • the object of the present invention is now to provide an aqueous powder clearcoat dispersion which can be applied to automobile bodies using the previous liquid paint technology, in particular can be baked in at temperatures of 130 ° C. and especially after the wet-on-wet application does not lead to cracks in the clear lacquer.
  • aqueous powder clearcoat dispersion consisting of a solid, powdery component A and an aqueous component B, wherein
  • Component A. is a powder clearcoat comprising a) at least one epoxy-containing binder with a content of 25 to 45%, preferably 30 to 35% of glycidyl-containing monomers, optionally with a content of vinyl aromatic compounds, preferably styrene, b) at least one crosslinking agent, preferably straight-chain , aliphatic dicarboxylic acids, carboxy-functional polyesters and / or tris (alkoxycarbonylamino) triazine and c) if necessary.
  • Catalysts, auxiliaries, additives typical for powder clearcoat such as degassing agents, leveling agents, UV absorbers, radical scavengers, antioxidants and component B.
  • An aqueous dispersion is at least a) a non-ionic thickener and b) optionally catalysts, auxiliary substances, defoaming agents, dispersion aids, wetting agents, antioxidants, UV absorbers, radical scavengers, small amounts of solvents, leveling agents, biocides and / or water retention agents, c) a dispersant in the form of a non-ionic Polyurethane dispersion
  • Component A a) 60-80 parts b) 15-30 parts c) 3-10 parts
  • Component B 20-50 parts component a 80-50 parts component b 20-50 parts component c 1000-5000 parts distilled water
  • the dispersion preferably contains 25-100 parts of component A and 100 parts of component B.
  • Suitable epoxy functional binders for the solid powder clearcoat used for the preparation of the dispersion are, for example, epoxy group-containing polyacrylate resins which are obtained by copolymerizing at least one ethylenically unsaturated monomer which contains at least one epoxide group in the molecule with at least one further ethylenically unsaturated monomer which is none Contains epoxy group in the molecule can be produced, at least one of the monomers being an ester of acrylic acid or methacrylic acid.
  • epoxy group-containing polyacrylate resins are e.g. known from EP-A-299 420, DE-B-22 14 650, DE-B-27 49 576, US-A-4,091, 048 and US-A-3,781, 379).
  • ethylenically unsaturated monomers which contain no epoxy groups in the molecule
  • acid amides such as, for example, acrylic acid and methacrylic acid amide
  • vinylaromatic compounds such as styrene, methylstyrene and vinyltoluene
  • nitriles such as acrylonitrile and methacrylonitrile
  • vinyl and vinylidene halides such as vinyl chloride and vinylidene fluoride
  • Vinyl esters such as vinyl acetate and monomers containing hydroxyl groups, such as, for example, hydroxyethyl acrylate and hydroxyethyl methacrylate.
  • the epoxy group-containing polyacrylate resin usually has an epoxy equivalent weight of 400 to 2500, preferably 420 to 700, a number average molecular weight (determined by gel permeation chromatography using a polystyrene standard) from 2,000 to 20,000, preferably from 3,000 to 10,000, and a glass transition temperature (T G ) from 30 to 80 , preferably from 40 to 70, particularly preferably from 40 to 60 ° C. (measured with the aid of differential scanning calometry (DSC). Very particularly preferred are approximately 50 ° C. Mixtures of two or more acrylate resins can also be used.
  • the epoxy group-containing polyacrylate resin can be prepared by polymerization using generally well-known methods.
  • Suitable crosslinkers are carboxylic acids, in particular saturated, straight-chain, aliphatic dicarboxylic acids with 3 to 20 carbon atoms in the molecule. Dodecane-1, 12-diacid is very particularly preferably used. To modify the properties of the finished powder clearcoat materials, other crosslinkers containing carboxyl groups may also be used. Examples of these are saturated branched or unsaturated straight-chain di- and polycarboxylic acids and polymers with carboxyl groups.
  • Tris (alkoxycarbonylamino) triazines according to US Pat. No. 4,939,213, US Pat. No. 5,084,541 and EP 0 624 577 can also be used as crosslinking agents.
  • R methyl, butyl, ethylhexyl groups. Derivatives of the compounds mentioned can also be used.
  • methyl, butyl mixed esters are preferred according to the invention. Compared to pure methyl esters, these have the advantage of better solubility in polymer melts and mixed butyl-ethylhexyl esters.
  • the pure butyl esters are also preferred according to the invention.
  • tris (aikoxycarbonylamino) triazines and their derivatives can also be used according to the invention in a mixture with conventional crosslinking agents (component C).
  • Blocked polyisocyanates other than tris (alkoxycarbonylamino) triazines are particularly suitable here.
  • Aminoplast resins are also e.g. Melamine, can be used. In principle, any aminoplast resin suitable for transparent topcoats or a mixture of such aminoplast resins can be used.
  • crosslinkers mentioned can be used individually or in any combination with one another.
  • Powder clearcoats which contain an epoxy-functional crosslinker and an acid-functional binder are also suitable.
  • Suitable acid-functional binders are, for example, acidic polyacrylate resins which can be prepared by copolymerizing at least one ethylenically unsaturated monomer which contains at least one acid group in the molecule with at least one further ethylenically unsaturated monomer which does not contain any acid group in the molecule.
  • the epoxy group-containing binder or the epoxy group-containing crosslinking agent and the carboxyl or the binder are usually used in an amount such that 0.5 to 1.5, preferably 0.75 to 1.25, equivalents of carboxyl groups are present per equivalent of epoxy groups.
  • the amount of carboxyl groups present can be determined by titration with an alcoholic KOH solution.
  • the binder contains vinyl aromatic compounds, in particular styrene.
  • the content is not more than 35% by weight. 10 to 25% by weight are preferred.
  • the solid powder coatings may contain one or more suitable catalysts for curing epoxy resin.
  • Suitable catalysts are phosphonium salts of organic or inorganic acids, quaternary ammonium compounds, amines, imidazole and imidazole derivatives.
  • the catalysts are generally used in proportions of 0.001% by weight to about 2% by weight, based on the total weight of the epoxy resin and the crosslinking agent.
  • Suitable phosphonium catalysts are ethyltriphenylphosphonium iodide, ethyltriphenylphosphonium chloride,
  • Ethyltriphenylphosphonium thiocyanate ethyltriphenylphosphonium acetate-acetic acid complex
  • tetrabutylphosphonium iodide tetrabutylphosphonium bromide and tetrabutylphosphonium acetate-acetic acid complex.
  • suitable phosphonium catalysts are described, for example, in US Pat. No. 3,477,990 and US Pat. No. 3,341,580.
  • Suitable imidazole catalysts are, for example, 2-styrylimidazole, 1-benzyl-2-methylimidazole, 2-methylimidazole and 2-butylimidazole. These and other imidazole catalysts are e.g. described in Belgian Patent No. 756,693.
  • the solid powder coatings may also contain auxiliaries and additives.
  • auxiliaries and additives examples include leveling agents, antioxidants, UV absorbers, free radical scavengers, trickling aids and degassing agents, such as, for example, benzoin.
  • Sales agents based on polyacrylates, polysiloxanes or fluorine compounds are suitable.
  • Antioxidants that can be used are reducing agents such as hydrazienes and phosphorus compounds and free radical scavengers, e.g. 2,6 di-tert-butylphenol derivatives.
  • UV adsorbers that can be used are preferably triazines and benzotriphenol.
  • 2,2,6,6-Tetramethylpiperdine derivatives are preferably used as radical scavengers.
  • the solid powder coatings may also contain auxiliaries and additives. Examples of these are leveling agents, antioxidants, UV absorbers, radical scavengers, trickle piles and degassing agents such as benzoin.
  • Component B contains a non-ionic thickener a). Examples of these are modified celluloses and polyurethane thickeners.
  • Structural features of such associative thickeners a) are: aa) a hydrophilic scaffold which ensures sufficient water solubility and ab) hydrophobic groups which are capable of an associative interaction in the aqueous medium.
  • Long-chain alkyl residues such as e.g. Dodecyl, hexadecyl or octadecyl residues, or alkaryl residues, such as e.g. Octylphenyl or nonylphenyl radicals used.
  • Polyacrylates, cellulose ethers or particularly preferably polyurethanes which contain the hydrophobic groups as polymer building blocks are preferably used as the hydrophilic frameworks.
  • Polyurethanes which contain polyether chains as building blocks, preferably made of polyethylene oxide, are very particularly preferred as the hydrophilic frameworks.
  • the di- and / or polyisocyanates preferably aliphatic diisocyanates, particularly preferably optionally alkyl-substituted 1,6-hexamethylene diisocyanate, are used to link the hydroxyl group-terminated polyether units to one another and to link the polyether units with the hydrophobic end group units, for example monofunctional alcohols and / or amines with the long-chain alkyl radicals or aralkyl radicals already mentioned.
  • the nonionic associative thickeners are designed in such a way that they can form both hydrophobic / hydrophobic interactions with the solid particles contained in the powder coating dispersion and also with one another by the design of their hydrophobic groups. This creates and controls a three-dimensional network. Furthermore, the associative thicker must have such a high content of hydrophilic groups that they are distributed homogeneously in the water and no phase separation towards the water occurs. Examples of suitable non-ionic associative thickeners and their mechanism of action are described in detail in the textbook "paint additives" by Johan Bieleman, Wiley-VCH, Weinheim, New York, 1998.
  • Component B may also contain catalysts, leveling agents, antioxidants, UV absorbers, radical scavengers and wetting agents. Essentially, the substances already listed for component A come into consideration here.
  • component B Auxiliaries, defoaming agents, biocides, solvents and neutralizing agents can also be added to component B.
  • Modified polysiloxanes are preferred as defoaming agents.
  • Neutralizers that can be used are amines, ammonia and metal hydroxides.
  • dispersants c) are compounds based on polyurethanes.
  • non-ionic dispersants c) essential to the invention in the form of a polyurethane dispersion differ from the non-ionic associative thickeners in two ways:
  • hydrophobic groups of the dispersants c) are designed so that preferably hydrophobic / hydrophobic contacts to those in the
  • Particles containing powder coating dispersion are formed so that no three-dimensional network is formed, as is typical for the associative thicker.
  • hydrophilicity is reduced. There are only so many hydrophilic groups in the dispersant c) that the particles are enveloped and shielded by the hydrophilic structural elements. The effect of the hydrophilic structural elements is not so strong that they can detach the hydrophobic structural elements from the particles and introduce them into the aqueous phase. It expresses itself clearly comparatively low hydrophilicity due to the formation of a second phase in water by the dispersants as such.
  • the polyurethane resins c) used according to the invention preferably consist of
  • the organic component of the polyurethane composition c) comprises a polyester polyol, a low molecular weight diol and / or triol or mixtures thereof. If necessary. a monomer containing trifunctional hydroxyl groups can be used.
  • the polyurethane comprises c)
  • a non-ionic stabilizer i.e. a non-ionic dispersant c
  • a monofunctional polyether with a component containing polyisocyanate to produce an isocyanate intermediate and ii. a component with at least one active amine and at least two active hydroxyl groups and
  • the organic component preferably comprises
  • Polyether polyester polyol a low molecular weight diol and / or triol or mixtures thereof.
  • the polyester component can be prepared by reacting at least one dicarboxylic acid and at least one alcohol component, the alcohol having at least two hydroxyl groups contains.
  • the carboxylic acid component contains two or more
  • Dimer fatty acids and cycloaliphatic dicarboxylic acids such as isophthalic acid.
  • the polyester resin can also contain one or more low molecular weight diols or triols. In principle, any polyol can be used.
  • polyester resins or mixtures of the polyester resins used preferably contain terminal hydroxyl groups. This is done by adding an excess of polyols.
  • Both monocarboxylic acids and monoalcohols can be used to synthesize the polyesters.
  • the monocarboxylic acids and / or monoalcohols are preferably present in the polyester resin in a very small amount by weight.
  • the polyester diol components preferably used comprise between 20 and 80% by weight of the polyurethane resin.
  • the amounts are preferably between 50 and 70% by weight. 55 to 65% by weight are very particularly preferred.
  • Polyester polyols with a molecular weight between 500 and 5000 are used to produce the polyurethane c). Molecular weights between 1000 and 3500 are preferred.
  • the polyurethane resins can contain further organic components with at least two reactive hydrogen atoms. These are preferably diols and triols, thiols and / or amines or mixtures of these substances.
  • the components that are used to synthesize the polyester component can also be used as separate components here.
  • Ie, as an additional organic component in the Polyurethane can also be di- or trial alcohols, such as neopentyl glycol or 1, 6-hexanediol or trimethylol propane.
  • the molecular weight of the diols and / or triols used in the polyurethane resin is between 0 and 20% by weight. 1 to 6% by weight are preferred.
  • the polyurethane resin also contains polyisocyanates, especially diisocyanates.
  • the isocyanates are between 5 and 40% by weight based on the polyurethane mass. 10 to 30% by weight and very particularly 10 to 20% by weight are particularly preferred.
  • a monofunctional polyether is used to produce the polyurethane.
  • a non-ionic stabilizer c) is produced in which a monofunctional polyether is preferably reacted with a diisocyanate. The reaction product formed is then reacted with a component which contains at least one active amine group and at least two active hydroxyl groups.
  • the polyurethane c) comprises a reaction product of:
  • polyester polyol which in turn is a reaction product of a carboxylic acid with at least two carboxyl groups and a component with at least two hydroxyl groups,
  • a non-ionic stabilizer prepared by reacting a monofunctional ether with a polyisocyanate and then reacting the reaction product obtained with a component which contains at least one active amine and at least two active hydroxyl groups.
  • the polyurethane c) comprises a reaction product
  • the polyesters are synthesized with the carboxylic acid components described above and an excess of polyols.
  • the excess of polyols is chosen so that terminal hydroxyl groups are preferably formed.
  • the polyols preferably have a hydroxyl functionality of at least two.
  • the polyester resin preferably consists of one or more polyols, preferably a diol.
  • Preferred diols are alkylene glycols, such as ethylene glycol, propylene glycol, butylene glycol and neopentyl glycol, 1,6-hexanediol or other glycols, such as bisphenol-A, cyclohexanedimethanol, caprolactone diol, hydroxyalkylated bisphenol and similar compounds.
  • the low molecular weight diols preferably used according to the invention are known from the prior art. These include aliphatic diols, preferably alkylene polyols having 2 to 18 carbon atoms. Examples include 1,4-butanediol, cycloaiiphatic diols such as 1,2-cyclohexanediol and cyclohexanedimethanol.
  • suitable organic polyisocyanates are preferably those which comprise at least two isocyanate groups. More specifically, the isocyanates are preferred, for example p-phenylene, biphenyl, 4,4 '-Diisocyanate, toluene diisocyanates, 3,3' -dimethyl-4,4 Biphenylendiisocyanate, 1, 4-
  • Tetramethylene diisocyanates 1,6-hexamethylene diisocyanates, 2,2,4-trimethylhexane-1,6-diisocyanates, methylene bis (phenyl isocyanates), 1,5 Naphthalene diisocyanates, bis (isocyanatoethyl fumarate),
  • Isophorone diisocyanates and methylene bis (4-cyclohexyl isocyanates).
  • diisocyanates In addition to the diisocyanates mentioned, other multifunctional isocyanates are also used. Examples are 1,2,4-benzene diisocyanates and polymethylene polyphenyl isocyanates.
  • aliphatic diisocyanates e.g. 1, 6-hexamethylene diisocyanate, 1, 4-butylene diisocyanate, methylene bis (4-cyclohexyl isocyanate), isophorone diisocyanate and 2,4-toluene diisocyanate.
  • Longer chain polyurethane resins c) can be obtained by chain extension with components containing diol and / or triol groups.
  • Chain extenders with at least two active hydrogen groups e.g. Diols, thioien, diamines or mixtures of these substances, e.g. Alkanolamines, aminoalkyl mercaptans, hydroxyalkyl mercaptans and similar compounds.
  • diols used as chain extenders are 1, 6-hexanediol, cyclohexanedimethylol and 1, 4-butanediol.
  • a particularly preferred diol is neopentyl glycol.
  • the polyethers used according to the invention are preferably mono- or difunctional polyethers.
  • the monofunctional ones include, for example, those produced by polymerizing ethylene oxides, propylene oxides or mixtures thereof.
  • An example of a suitable polyether is methoxypolyethylene glycol from Union Carbide Chemicals under the brand name Carbowax® MPEG 2000.
  • the polyurethane product c) described can be mixed with conventional crosslinking agents. These preferably include aminoplast resins, for example melamine. Likewise, condensation products other amines and amides are used, for example aldehyde condensates of triazines, diazines, triazoles, guanidines, guanamines or alkyl- and aryl-substituted derivatives of such components.
  • Diaminopyrimidines 2,4,6-triethyltriamino-1, 3,5-triazines and similar substances.
  • Formaldehydes are preferred as aldehyde. Acetaldehydes, crotonaldehydes, acrolein, benzaldehydes, furfural can also be used.
  • the amine-aldehyde condensation products can contain methylol or similar alcohol groups.
  • usable alcohols are methanol, ethanol, propanol, butanol, pentanol, hexanol, heptanol, benzyl alcohol and aromatic alcohols, cyclic alcohols such as cyclohexanol, monoethers or glycols and substituted alcohols, e.g. 3-chloropropanol.
  • blocked polyisocyanates according to the invention can also be used as crosslinking agents.
  • These include, for example, organic polyisocyanates such as trimethylene, tetramethylene, hexamethylene, 1,2-propylene, 1,2-butylene and 2,3-butylene diisocyanates.
  • cycloalkene components such as 1,3-cyclopentane, 1,4-cyclohexane and 1,2-cyclohexane diisocyanates.
  • aromatic components such as phenylene, p-phenylene, 4,4 '- diphenyl, 1, 5-naphthalene and 1, 4-naphthalene diisocyanates usable.
  • aliphatic-aromatic components such as 4,4 '- diphenylene methane, 2,4- or 2,6-tolylene or mixtures thereof, 4,4' - toluidine and 1, 4 xylylene into consideration.
  • nucleus-substituted aromatic components such as 4,4 ' -
  • Triisocyanates which can be used are triphenylmethane-4,4 ' , 4 " -triisocyanates, 1,3,5- Triisocyanate benzene and 2,4,6-triisocyanate toluene.
  • a tetraisocyanate are finally 4,4'-diphenyl-dimethyl methane, 2,2 '-, 5,5' -Tetraisocyanate.
  • Aliphatic, cycloaliphatic aromatic alkyl mono alcohols can be used as blocking agents. These include, for example, methyl, ethyl, chloroethyl, propyl, butyl, cyclohexyl, heptyl, octyl, nonyl 3,3,5-trimethylhexanol, decyl and lauryl alcohols.
  • phenolic components e.g. Phenols or substituted phenols can be used. Examples include cresol, xylenol, nitrophesol, chlorophenol, ethylphenol, 1-butylphenol and 2,5-di-t-butyl-4-hydroxytoluene.
  • Suitable blocking agents are tertiary hydroxylamines, e.g. Diethylethanolamine and oximes such as methyl ethyl ketone oxime, acetone oxime and cyclohexanone oxime.
  • crosslinking agents described are present in the polyurethane dispersion c) in amounts of 2 to 15% by weight, preferably 4 to 8% by weight.
  • the polyurethane dispersion c) obtained is present in the powder slurry in a proportion of 0.5 to 20% by weight, preferably 2 to 15% by weight.
  • the solid powder coatings are produced by known methods (cf., for example, product information from the company BASF Lacke + Wegner AG, "powder coatings", 1990) by homogenization and dispersion, for example by means of an extruder, screw kneader and others Powder coatings are prepared for dispersion by grinding and, if necessary, sifting and sieving.
  • the aqueous can then be obtained from the powder by wet grinding or by stirring in dry-ground powder coating Powder clearcoat dispersion can be produced. Wet grinding is particularly preferred.
  • the present invention also relates to a process for producing an aqueous powder coating dispersion based on component A described, which is dispersed in component B according to the invention.
  • component A After component A has been dispersed in component B, grinding is carried out if necessary, the pH is adjusted to 4.0 to 7.0, preferably 5.5 to 6.5 and filtered.
  • the average grain size is between 1 and 25 ⁇ m, preferably less than 20 ⁇ m. Particularly preferred at 3 to 10 microns.
  • the solids content of the aqueous powder clearcoat dispersion is between 15 and 50%.
  • defoamers, dispersing aids, wetting agents and / or thickeners are preferably first dispersed in water. Then small portions of the powder clear lacquer are stirred in. Then defoamers, dispersing aids, thickeners and wetting agents are dispersed again. Finally, powder clear lacquers are stirred in again in small portions.
  • the pH is preferably adjusted with ammonia or amines.
  • the pH value can initially rise here, resulting in a strongly basic dispersion. However, the pH drops back to the above values within several hours or days.
  • Another variant for the preparation of the powder clearcoat dispersion according to the invention is that a liquid melt of the binders and injuries and optionally the additives c) of component A is mixed, added to an emulsifying device, preferably with the addition of water and stabilizers, the emulsion obtained is cooled and be filtered.
  • the polymeric components are fed as viscous resin melts into the dispersing units.
  • binders and crosslinkers have to be melted.
  • the ratio of crosslinkers to binders is 0.6 to 1: 1.4, preferably 0.8: 1 to 1: 1.2.
  • the crosslinker and binder are preferably heated in separate containers. The temperature is selected so that both components are melted and their viscosity allows further processing, especially conveying. The higher the temperature of the melt, the lower the viscosity and the better the quality of the mix.
  • a crosslinking reaction must be largely excluded. The crosslinking reaction takes place much faster at higher temperatures. Therefore there is only a narrow temperature-time window, in which the available dwell time until cooling down is sufficiently long, and at the same time good emulsification is possible. In order to use this as efficiently as possible, the binder and crosslinker melts are only brought together immediately before the mixing zone.
  • the components Before the components are conveyed through the system, they can preferably be heated to the desired process temperature with steam.
  • the molten binder-additive mixture and the crosslinker melt are then conveyed through the entire system in preferably separate, heated feed lines with pumps and metered into a mixer.
  • About the volume flow of the feed pumps a stoichiometric ratio of
  • the liquid mixture is then immediately emulsified in water.
  • An emulsifier is added to the organic phase and / or the water. If an aqueous emulsifier / stabilizer solution is used, it is heated under pressure to a temperature in the vicinity of the mixing temperature and the liquid binder / crosslinker mixture is emulsified therein.
  • Mixing and emulsification can be carried out in two separate machines or in a multi-stage machine.
  • the second solution has significant advantages for reasons of crosslinking, since the residence time at the high temperatures is minimized here. Possibly. Any organic solvent present can subsequently be separated off from the aqueous phase directly by vacuum distillation at low temperatures.
  • cooling is carried out immediately. This must be realized in such a way that, on the one hand, there is no sticking of the disperse resin particles, and, on the other hand, the dwell time until the point at which no crosslinking reaction can take place is as short as possible.
  • This goal can e.g. B. can be achieved by using a heat exchanger, cooling by injecting cold water or by spraying the emulsion into cold water.
  • the dwell time from the beginning of the mixing phase to the end of the cooling phase must be kept as short as possible. This is less than 5 s, preferably less than 1 s. Continuous processes are therefore preferred.
  • machines such as rotor-stator dispersers (tooth colloid or wet rotor mills, gear rim dispersing machines, intensive mixers) and static mixers are used.
  • the binder / crosslinker mixture can be atomized in water or component B. If sufficient fineness is not achieved, rotor-stator units or static mixers can be used.
  • a further increase in the local power input is possible through the use of a high-pressure homogenizer described above.
  • the emulsion is pressed through fine openings at pressures in the range of 100-1500 bar, preferably 100 to 1000 bar, particularly 100 to 200 bar, which leads to a significant reduction in the droplet size and thus to a greater stability of the emulsion during storage .
  • micronization variants lead to solvent-free dispersions with the average particle sizes in the range of 100-10000, preferably 150 to 6000, particularly preferably 400 to 4000, most preferably 600-3500 nm and are thus even more finely divided than those by wet grinding of powder coatings according to the prior art Technically producible aqueous dispersions (particle size 3-20 ⁇ m).
  • the process described can be used to produce finely divided polymer dispersions having molecular weights in the range from 1000 to 20,000, preferably 1000 to 10,000, particularly preferably 1500 to 6000, most preferably 1500 to 4000 g / mol.
  • the powder clearcoat dispersion according to the invention can be used as a coating for basecoats, preferably in the automotive industry.
  • the clear lacquer dispersion is particularly suitable for water-based lacquers based on a polyester, polyurethane resin and an aminoplast resin.
  • the powder clear dispersion according to the invention can be applied using the methods known from liquid coating technology. In particular, they can be applied by spraying.
  • the powder clear dispersion applied to the basecoat is regularly flashed off before baking. This is expediently done first at room temperature and then at a slightly elevated temperature. As a rule, the elevated temperature is 40 to 70 ° C., preferably 50 to 65 ° C.
  • the flash off is carried out for 2 to 10 minutes, preferably 4 to 8 minutes at room temperature. At an elevated temperature, the mixture is vented again during the same time period.
  • the baking can be carried out at temperatures of 130 ° C.
  • the stoving can be carried out at 130 to 180 ° C., preferably 135 to 155 ° C.
  • layer thicknesses of 30 to 50, preferably 35 to 45 ⁇ m can be achieved.
  • clear lacquers of comparable quality could only be achieved using powder clear lacquers by applying layer thicknesses of 65 to 80 ⁇ m.
  • Pripol 1013 commercially available dimer fatty acid from Unichema
  • 22.413 parts by weight of hexanediol 12.051 parts by weight of isophthalic acid are slowly increased to max. Heated 220 ° C until the acid number is less than 4.
  • the product is then cooled to 80 ° C. and diluted with 24.025 parts by weight of methyl ethyl ketone.
  • the ground material was treated with 0.5% Byk 345 (leveling agent containing silicone),
  • 10% aqueous DMEA solution was added to adjust the pH to 6.0 and adjusted to spray viscosity with water (300 Pas at 1000 s "1 ).
  • the silver metallic WBL (Würzburg system, PAT EP 0 228 003 B2 or DE 38 25 278 and
  • the clear lacquer film from the exemplary embodiment C2. is characterized by a significantly lower tendency to cracking.
  • the semi-finished product (regrind) and the wet paint have a lower tendency to sedimentation than the wet paint of the comparative example C3 ..
  • the regrind is better temperature resistant and shear stable.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Paints Or Removers (AREA)

Abstract

L'invention concerne une dispersion-vernis en poudre aqueuse, comprenant un constituant A pulvérulent solide et un constituant B aqueux. Le vernis en poudre A contient a) au moins un liant époxyde contenant 25 à 45 % en poids, et de préférence 25 à 35 % en poids, de monomères glycidyliques contenant éventuellement des composés vinylaromatiques, de préférence du styrène, b) au moins un agent de réticulation, de préférence des acides dicarboniques aliphatiques à chaîne droite ou des polyesters à fonction carboxy, ainsi que c) éventuellement des catalyseurs, agents auxiliaires, additifs typiques des vernis en poudre tels que dégazants, agents d'écoulement, absorbeurs UV, absorbeurs de radicaux, antioxydants. La dispersion aqueuse B contient a) au moins un épaississant non ionique, b) éventuellement des catalyseurs, agents auxiliaires, agents anti-mousse, agents mouillants, anti-oxydants, absorbeurs UV, absorbeurs de radicaux, biocides, faibles doses de solvants, agents d'écoulement, neutralisants, de préférence amines ou agents de rétention d'eau, ainsi que c) un agent dispersant sous forme d'une dispersion de polyuréthanne non ionique.
EP99917932A 1998-04-01 1999-03-31 Dispersion-vernis en poudre stabilisee de maniere non ionique Withdrawn EP1084199A2 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19814471 1998-04-01
DE19814471 1998-04-01
DE19912661 1999-03-20
DE19912661A DE19912661A1 (de) 1998-04-01 1999-03-20 Nicht-ionisch stabilisierte Pulverlack-Dispersion
PCT/EP1999/002204 WO1999050359A2 (fr) 1998-04-01 1999-03-31 Dispersion-vernis en poudre stabilisee de maniere non ionique

Publications (1)

Publication Number Publication Date
EP1084199A2 true EP1084199A2 (fr) 2001-03-21

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EP99917932A Withdrawn EP1084199A2 (fr) 1998-04-01 1999-03-31 Dispersion-vernis en poudre stabilisee de maniere non ionique

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Country Link
US (1) US6344501B1 (fr)
EP (1) EP1084199A2 (fr)
JP (1) JP2003527449A (fr)
WO (1) WO1999050359A2 (fr)

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DE19920799A1 (de) 1999-05-06 2000-11-16 Basf Coatings Ag Thermisch und mit aktinischer Strahlung härtbarer Beschichtungsstoff und seine Verwendung
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WO1999050359A2 (fr) 1999-10-07
JP2003527449A (ja) 2003-09-16
WO1999050359A3 (fr) 1999-11-18
US6344501B1 (en) 2002-02-05

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