EP1029006A1 - Compositions aqueuses constituees d'une dispersion carbonyle-polymere, d'un pigment et de polyamine - Google Patents

Compositions aqueuses constituees d'une dispersion carbonyle-polymere, d'un pigment et de polyamine

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Publication number
EP1029006A1
EP1029006A1 EP98963429A EP98963429A EP1029006A1 EP 1029006 A1 EP1029006 A1 EP 1029006A1 EP 98963429 A EP98963429 A EP 98963429A EP 98963429 A EP98963429 A EP 98963429A EP 1029006 A1 EP1029006 A1 EP 1029006A1
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EP
European Patent Office
Prior art keywords
weight
monomers
polymer
acid
emulsion paint
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EP98963429A
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German (de)
English (en)
Inventor
Cheng-Le Zhao
Joachim Roser
Rolf Dersch
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BASF SE
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BASF SE
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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
    • 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

Definitions

  • a low pigment binding capacity leads to poor mechanical stability of the coating, which manifests itself, for example, in low wet abrasion resistance.
  • a high level of wet abrasion resistance is particularly desirable for washable emulsion paints.
  • the binder has a sufficiently low film-forming temperature in order to ensure processing of the coating composition even at low temperatures.
  • the binder polymer must not be too soft to ensure sufficient strength, or be too sticky to avoid soiling. 5
  • the dispersion paints should be stable against environmental influences such as sunlight, moisture and temperature fluctuations, especially in outdoor applications. The paint must also adhere well to different substrates, which also depends on the binder polymer selected.
  • Another property that depends on the binder polymer is the blocking resistance of the paints.
  • EP-A-184 091 describes coating compositions based on aqueous polymer dispersions which have a low film-forming temperature and form films with high blocking resistance.
  • the polymer dispersions disclosed there may also contain copolymerized monomers having a crosslinking action.
  • the coating compositions described only contain a small amount of inorganic substances and pigments.
  • EP-A-327 006 and EP-A-327 376 disclose emulsion paints based on aqueous polymer dispersions which contain copolymerized monomers containing siloxane groups.
  • Such monomers are expensive, so that even a small amount increases the manufacturing costs for the binder considerably.
  • it must be expected that the properties of the binder will be changed during storage by hydrolysis of the siloxane groups.
  • US 4,219,454 describes binders for coating compositions, e.g. B. emulsion paints, based on aqueous polymer dispersions, the urea group-containing monomers to improve the adhesive strength of the coatings in the wet state (so-called. Wet adhesion) contain polymerized.
  • the coatings described there also have only low pigment contents.
  • the problem of the wet abrasion resistance of coating compositions with a PVC> 40% is only inadequately solved by the polymers described there.
  • DE-OS-25 35 374 discloses binders for emulsion paints which contain copolymerized monomers with cyanoacetyl or acetoacetyl groups.
  • the coatings are characterized by improved wet adhesion and good adhesion to hydrophobic substrates.
  • the emulsion paints described there only have a low content of inorganic pigments.
  • binders for sealing compounds are known, the binders of which comprise at least one compound having two primary amino groups and at least one polymer functionalized with keto groups.
  • the use of binders in emulsion paints with a PVC> 40% is not suggested.
  • Similar binders are used in EP-A-5167 for low-pigmented paints and for colored stone plasters.
  • R 1 represents hydrogen, alkyl, cycloalkyl, aryl or aralkyl
  • X is bonded to a carbon atom of the polymer chain and for a single bond, alkylene, arylene, -R 2 -0-R 3 -,
  • Aryl is preferably phenyl or naphthyl, which can optionally also carry 1 to 4 substituents which are selected independently of one another from C 1 -C 4 -alkyl, in particular methyl or ethyl, C ! -C alkoxy, e.g. B. methoxy or ethoxy, hydroxy, which may optionally also be ethoxylated, or halogen.
  • Alkylene stands for a linear or branched divalent alkyl radical, preferably a C ⁇ -C 2 alkyl radical, for. B.
  • the polymers P contained in the binder preparations according to the invention are characterized in that they have carbonyl groups which can react with NH 2 groups to form a bond without, however, themselves reacting with one another.
  • the carbonyl groups (CO) are bonded to the polymer either directly or via a bridge member X.
  • the carbonyl groups can carry the substituents customary for them.
  • the functional groups contained in the polymers can thus be described by the formula -X- (C0) -R 1 .
  • R 1 is preferably hydrogen or C ⁇ -C alkyl, especially hydrogen or methyl.
  • the bridge member X can be used for a single bond, for a C 1 -C 6 -alkylene unit or in particular for a group -R 2 -Z-0-R 3 - or -R 2 -ZN (R 4 ) -R 3 - stand.
  • R 2 , R 3 and Z have the meanings mentioned above, preferably Z is CO, R 2 is a single bond or C 1 -C 4 -alkylene and R 3 is C 1 -C 6 -alkylene, in particular methylene, l -Methyl-l, 2-propylene or for p-phenylene.
  • R 4 preferably represents hydrogen, -CC alkyl or a group -R 3 - (C0) -R 1 , wherein R 1 and R 3 have the meanings given above, preferably those meanings which have already been given above as preferred for them were.
  • keto or aldehyde groups can be generated by converting existing functionalities in the sense of a polymer-analogous reaction. Examples include the reaction of any double bonds contained in the polymer with carbonylation reagents or the oxidation of aliphatic OH groups in carbonyl groups.
  • the CO groups according to the invention can also be incorporated into the polymer with the aid of low molecular weight compounds, which in turn contain both one or more keto or aldehyde groups and at least one functional group different therefrom, which can react with the functional groups contained in the polymer to form bonds In the sense of a polymer-analogous reaction.
  • the second type of reaction can be carried out, for example, by reacting the OH or NH 2 groups which may be present in the polymer with compounds which are accessible to nucleophilic substitution reactions, for example .alpha.-halogenocarbonyl compounds, for. B. chloroacetone can be realized.
  • the polymers P are preferably obtained by radical copolymerization of at least one ethylenically unsaturated monomer a with at least one ethylenically unsaturated monomer b of the general formula I
  • R 7 CH C (R 6 ) X (CO) R 1 (I) where R 6 is hydrogen or methyl, R 7 is hydrogen, C ! -C 4 alkyl or a functional group -X-fCOJ-R 1 and X and R 1 have the meanings given above, prepared.
  • the monomers b are very particularly preferably the esters ⁇ , ⁇ -ethylenically unsaturated C 3 -Ca-mono- or dicarboxylic acids with alcohols which carry a carbonyl group, or the amides of the carboxylic acids mentioned which have one or two on nitrogen Substituents
  • Suitable ⁇ , ⁇ -ethylenically unsaturated C 3 -C 6 carboxylic acids are, for. As acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, citraconic acid or fumaric acid.
  • Suitable alcohols are e.g. B. glycolaldehyde, hydroxyacetone, ß-hydroxypropanal, l-hydroxybutan-2-one, 3-hydroxy
  • Suitable substituents on the amide nitrogen are e.g. B. l-0xoethan-2-yl, l-0xopropan-2-yl, 2-0xopropan-l-yl, 2-0xobutan-1-yl, 2-0xobutan-3-yl, 2-oxobutan-4- yl, 2-oxopentan-4-yl, 2-oxo-4-methylpentan-4-yl or p-acetylphenyl.
  • Alkyl and aryl vinyl ketones such as methyl vinyl ketone, ethyl vinyl ketone, isobutyl vinyl ketone, phenyl vinyl ketone and corresponding allyl alkyl and allyl aryl ketones are also suitable.
  • the diacetonamides of the aforementioned ethylenically unsaturated carboxylic acids and their esters with hydroxyacetone or diacetonylal are preferred.
  • Diacetone acrylamide or diacetone methacrylamide (1-acrylamido or 1-methacrylamido-l, l-dimethyl-3-oxobutane) are used specifically as monomers b.
  • Such monomers preferably make 0.1 to
  • Suitable monomers a are selected from vinylaromatic monomers such as styrene, ⁇ -methylstyrene, ortho-chlorostyrene or 45 vinyltoluenes, vinyl esters of Ci-Ci ⁇ -, preferably C ⁇ -C 12 -monocarboxylic acids, such as vinyl acetate, vinyl propionate, vinyl butyrate, vinyl valerate, Vinyl hexanoate, vinyl 2-ethylhexanoate, vinyl decanoate, vi- nyl laurate, vinyl stearate and vinyl ester of Versatic ® acids (Versatic ® acids are branched, aliphatic carboxylic acids with 5 to 11 carbon atoms).
  • esters ⁇ ß-ethylenically unsaturated C 3 -C 8 mono- or dicarboxylic acids preferably C ⁇ -C ⁇ 2 - 5 and, in particular C ⁇ -C 8 alkanols or Cs-C 8 -cycloalkanols in question.
  • Suitable CC 2 alkanols are, for example, methanol, ethanol, n-propanol, i-propanol, 1-butanol, 2-butanol, isobutanol, tert. -Butanol, n-hexanol and 2-ethylhexanol.
  • Suitable cycloalkanols are, for example, cyclopentanol or cyclohexanol.
  • esters of acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, citric acid or fumaric acid are (meth) acrylic acid methyl ester, (meth) acrylic acid ethyl ester, (meth) acrylic acid isopropyl ester, (meth) acrylic acid n-butyl ester,
  • the monomers a preferably comprise at least two different monomers al and a2. These are preferably selected from the aforementioned vinyl aromatic monomers, the esters of acrylic acid and methacrylic acid
  • the polymer P can also contain monomers c in copolymerized form, the homopolymers of which have increased water solubility or water swellability. These monomers can be copolymerized in amounts of up to 10% by weight, preferably up to 5% by weight, based on the total amount of monomers.
  • Such monomers increase the stability of the polymer dispersions used as binders.
  • These include monomers cl which contain acidic groups such as ⁇ , ⁇ -monoethylenically unsaturated mono- and dicarboxylic acids with 3 to 10 C atoms and ethylenically unsaturated sulfonic acids, phosphonic acids or dihydric
  • Examples of monomers c with acidic groups are the above-mentioned ethylenically unsaturated C 3 -C 8 carboxylic acids or C 4 -C B dicarboxylic acids, in particular special acrylic acid and methacrylic acid, also sulfonic acids, such as vinyl and allylsulfonic acid, (meth) acrylamidoethanesulfonic acid, 2- (meth) acrylamido-2-methyl-propanesulfonic acid, phosphonic acids, such as vinylphosphonic acid, allylphosphonic acid, 2-acrylamido-2-methylpropan-1 -phosphonic acid, phosphonoethyl acrylate and their alkali metal salts, especially their sodium salts.
  • the monomers c also comprise neutral or nonionic, modifying monomers c2, e.g. B. the amides, the N-alkylolamides or the hydroxyalkyl esters of the carboxylic acids mentioned, for example acrylamide, methacrylamide, N-methylolacrylamide, N-methylolmethacrylamide, 2-hydroxyethylacrylamide, 2-hydroxyethylmethacrylamide, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate .
  • the amides, the N-alkylolamides or the hydroxyalkyl esters of the carboxylic acids mentioned for example acrylamide, methacrylamide, N-methylolacrylamide, N-methylolmethacrylamide, 2-hydroxyethylacrylamide, 2-hydroxyethylmethacrylamide, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxy
  • the polymer P may also contain crosslinking monomers d in copolymerized form. If desired, these are used in minor amounts, ie in amounts of 0.1 to 5% by weight and in particular up to 1% by weight, based on the total amount of monomers. These are preferably monomers which have two non-conjugated, ethylenically unsaturated bonds, e.g. B. the diesters of dihydric alcohols with ⁇ , ⁇ -monoethylenically unsaturated C 3 -C 8 carboxylic acids, for. B. glycol bisacrylate or esters of ⁇ , ⁇ -unsaturated carboxylic acids with alkenols, e.g. B. Bicyclodecenyl (meth) acrylate. In a preferred embodiment, the polymer P contains no monomers d copolymerized.
  • the polymers P can of course also contain monomers which are known to improve the pigment binding power.
  • monomers containing siloxane groups such as the vinyl trialkoxysilanes, e.g. B. vinyltrimethoxysilane, alkylvinyl dialkoxysilanes or (meth) acryloxyalkyltrialkoxysilanes, e.g. B. (Meth) acryloxyethyltrimethoxysilane, (meth) acryloxypropyltrimethoxysilane.
  • the monomers mentioned can be used in amounts of up to 1% by weight, preferably 0.05 to 0.5% by weight, based on the total amount of monomers.
  • the polymers P can of course also contain the monomers known from the prior art in copolymerized form to improve wet adhesion. These include ethylenically unsaturated compounds that have urea groups, eg. B. N-vinyl and N-allyl urea and polymerizable derivatives of imidazolidin-2-one, e.g. B.
  • N-vinyl and N-allylimidazolidin-2-one N-vinyloxyethylimidazolidin-2-one, N- (2- (meth) acrylamidoethyl) imidazolidin-2-one, N- (2- (meth) acryloxyethyl ) imidazolidin-2-one, N- [2- ((meth) acryloxyaceta ido) ethyl) imidazolidin-2-one etc.
  • the property of the emulsion paints according to the invention depends on the glass transition temperature (DSC, midpoint temperature, ASTM D 3418-82) of the polymer P. if this is too low, the paint has a low strength and tears out under mechanical stress.
  • the glass transition temperature of the binder polymers P in question is therefore generally below 80 ° C., preferably below 60 ° C. and particularly preferably below 40 ° C. In general, however, it is above -60 ° C, preferably above -10 ° C and in particular above 0 ° C. It proves helpful here to estimate the glass transition temperature T g of the dispersed polymer. According to Fox (TG Fox, Bull. Am. Phys. Soc. (Ser. II) 1, 123 [1956] and Üllmann's Encyclopedia of Industrial Chemistry, Weinheim (1980), pp. 17, 18) the following applies to the glass transition temperature of copolymers large molar masses in good nutrition
  • JL _i:. J_i + _X_1
  • X 1 , X 2 , ..., X n are the mass fractions 1, 2, ..., n
  • T g 1 , T g 2 , ..., T g 11 the glass transition temperatures of the each mean only one of the monomers 1, 2, ..., n polymers in degrees Kelvin.
  • the latter are e.g. For example, from Ullmann's Encyclopedia of Indu- strial Chemistry, VCH, Weinheim, Vol. A 21 (1992) p 169 or known from J. Brandrup, EH Immergut, Polymer Handbook 3 rd ed, J. Wiley, New York 1989th
  • the glass transition temperature of the polymer P is due both to a suitable main monomer a, which has a glass transition temperature in the desired range, and to a combination of at least one monomer a1, the homopolymer of which has a high glass transition temperature and at least one monomer a2, whose homopolymer has a low glass transition temperature.
  • the monomers a constituting the polymer of component A comprise at least one monomer al whose homopolymer has a glass transition temperature T g > 30 ° C. for the limiting case of a very high molecular weight, and at least one monomer a2 whose homopolymer has one Glass transition temperature T g ⁇ 20 ° C.
  • Monomers a1 suitable for this purpose are, for example, styrene, ⁇ -methylstyrene, methyl methacrylate, ethyl methacrylate, n- and iso-propyl ethacrylate, n-, iso- and tert. Butyl methacrylate, vinyl acetate and tert.
  • Suitable monomers a2 are e.g. B. the C ⁇ -C ⁇ 2 alkyl acrylates, butadiene, vinyl propionate, vinyl ester of Versatic ® acids, especially ethyl acrylate, n-butyl acrylate and 2-ethylhexyl acrylate.
  • Monomer combinations a1) / a2) which comprise styrene and / or methyl methacrylate and also n-butyl acrylate and optionally 2-ethylhexyl acrylate are particularly preferred.
  • the binder polymer is composed of:
  • iii) 0.1 to 5% by weight, preferably 0.5 to 3% by weight, of at least one monomer b, in particular diacetone acrylamide and / or diacetone methacrylamide and
  • the parts by weight of the monomers al, a2, b and c add up to 100% by weight.
  • the polymer particles of the binder dispersion have an average polymer particle diameter in the range from 50 to 1000 nm (determined by means of an ultracentrifuge or by photon correlation spectroscopy; for particle size determination, see W.Mownle, Angew. Macromolecular Chemistry 1984 , Vol. 185, 1025-1039, W.Mambatle ibid., 1988, Vol. 162, 35-42).
  • binders with high solids contents e.g.
  • the weight-average particle diameter of the polymer particles in the dispersion is> 250 nm.
  • the average particle diameter will preferably not exceed 600 nm.
  • aqueous polymer dispersions used according to the invention are preferably prepared by free-radical aqueous emulsion polymerization of the monomers mentioned in Presence of at least one radical polymerization initiator and optionally a surfactant.
  • Free radical polymerization initiators are all those which are capable of initiating a free radical aqueous emulsion polymerization. It can be both peroxides, e.g. B. alkali metal peroxodisulfates and azo compounds. Redox initiator systems are preferably used, which are composed of at least one organic reducing agent and at least one peroxide and / or hydroperoxide, for. B. tert. -Butyl hydroperoxide with a sulfur compound, e.g. B. the sodium salt of hydroxymethanesulfinic acid, sodium sulfite, sodium disulfite, sodium thiosulfate or acetone bisulfite or hydrogen peroxide with ascorbic acid.
  • a sulfur compound e.g. B. the sodium salt of hydroxymethanesulfinic acid, sodium sulfite, sodium disulfite, sodium thiosulfate or acetone bisulfite or hydrogen peroxide with ascorbic acid
  • Redox initiator systems can also be used for this purpose, which contain a small amount of a metal compound soluble in the polymerization medium, the metallic component of which can occur in several valence stages, eg. B. ascorbic acid / iron (II) sulfate / hydrogen peroxide, with the sodium salt of hydroxymethanesulfinic acid, acetone bisulfite, sodium sulfite, sodium bisulfite or sodium bisulfite and instead of hydrogen peroxide also organic peroxides such as tert. -Butyl hydroperoxide, alkali peroxodisulfate and / or ammonium peroxodisulfate can be used.
  • initiators are peroxodisulfates, such as sodium peroxodisulfate or ammonium peroxodisulfate.
  • the amount of free-radical initiator systems used is preferably 0.1 to 2% by weight, based on the total amount of the monomers to be polymerized.
  • Suitable protective colloids are, for example, polyvinyl alcohols, starch and cellulose derivatives or copolymers containing vinylpyrrolidone.
  • a detailed description of further suitable protective colloids can be found in Houben-Weyl, Methods of Organic Chemistry, Volume XIV / 1, Macromolecular Substances, Georg-Thieme-Verlag, Stuttgart 1961, pp. 411-420.
  • Mixtures of emulsifiers and / or protective colloids can also be used.
  • Preferably only emulsifiers are used as surface-active substances, the relative molecular weights of which, in contrast to the protective colloids, are usually below 2000. You can use both anionic, cationic and nonionic Na- be.
  • the anionic emulsifiers include alkali and ammonium salts of alkyl sulfates (alkyl radical: C 8 -C ⁇ 2 ), of sulfuric acid semiesters of ethoxylated alkanols (EO degree: 2 to 50, alkyl radical: C ⁇ 2 to C 18 ) and ethoxylated alkylphenols (EO degree: 3 to 5 50, alkyl radical: C 4 -C 9 ), of alkyl sulfonic acids (alkyl radical: C ⁇ 2 -C ⁇ 8 ) and of alkylarylsulfonic acids (alkyl radical: C 9 to C 18 ).
  • alkyl sulfates alkyl radical: C 8 -C ⁇ 2
  • sulfuric acid semiesters of ethoxylated alkanols EO degree: 2 to 50, alkyl radical: C ⁇ 2 to C 18
  • ethoxylated alkylphenols EO degree: 3 to 5 50, alkyl radical
  • the anionic surface-active substances also include compounds of the general formula II
  • R 1 and R 2 are hydrogen or C 4 -C 24 alkyl and are not simultaneously 20 hydrogen, and X and Y can be alkali metal ions and / or ammonium ions.
  • R 1 and R 2 are preferably linear or branched alkyl radicals having 6 to 18 carbon atoms or hydrogen, and in particular having 6, 12 and 16 carbon atoms, where R 1 and R 2 are not both hydrogen at the same time.
  • X 25 and Y are preferably sodium, potassium or ammonium, sodium being particularly preferred.
  • Compounds II in which X and Y are sodium, R 1 is a branched alkyl radical having 12 C atoms and R 2 is hydrogen or R 1 are particularly advantageous.
  • nonionic emulsifiers can also be used.
  • Suitable nonionic emulsifiers are araliphatic or aliphatic nonionic emulsifiers, for example ethoxylated mono-, di- and trialkylphenols (EO degree: 3 to 50, alkyl radical: C 4 -C 9 ), ethoxylates long-chain
  • Ethoxylates of long-chain alkanols are preferred, and among them particularly preferably those based on oxo alcohols and native alcohols with a
  • Anionic emulsifiers are preferred or combinations of at least one anionic and one nonionic emulsifier.
  • the molecular weight of the polymers can be increased by adding small amounts, usually up to 2% by weight, based on the monomers to be polymerized, of one or more substances which regulate the molecular weight, for.
  • the emulsion polymerization can be carried out either continuously or according to the batch procedure, preferably according to a semi-continuous process.
  • the monomers to be polymerized can be fed continuously to the polymerization batch, including step or gradient procedures.
  • the emulsion polymerization can be carried out by the seed latex process or in the presence of seed latex prepared in situ to set a defined polymer particle size. Methods for this are known and can be found in the prior art (see EP-B 40419,
  • the polymerization is preferably carried out in the presence of 0.01 to 3% by weight and in particular 0.05 to 1.5% by weight of a seed latex (solids content of the seed latex, based on the total amount of monomer), preferably with the seed latex present (master seed).
  • the latex generally has a weight-average particle size of 10 to 100 nm and in particular 20 to 50 nm. Its constituent monomers are, for example, styrene, methyl methacrylate, n-butyl acrylate and mixtures thereof, the seed latex also being able to contain to a lesser extent monomers c, preferably less than 10% by weight, based on the total weight of the polymer particles in the seed latex.
  • Polymerization pressure and polymerization temperature are of minor importance. In general, temperatures between room temperature and 120 ° C, preferably at temperatures of 40 to 95 ° C and particularly preferably between 50 and 90 ° C.
  • the lowering of the residual monomers can furthermore be carried out chemically by radical postpolymerization, in particular under the action of redox initiator systems such as those described, for example, in US Pat. B. in DE-A 44 35 423, DE-A 44 19 518 and in DE-A 44 35 422 are listed.
  • the postpolymerization is preferably carried out using a redox initiator system composed of at least one organic peroxide and one organic sulfite.
  • component A preferably contains dispersions with polymer contents in the range from 30 to
  • Dispersions with polymer contents> 50% by weight are particularly preferred.
  • Polymerization processes for ethylenically unsaturated monomers are preferably carried out by free-radical aqueous emulsion polymerization.
  • all of the monomers mentioned under a are possible as monomers, provided that a sufficient amount of monomers, preferably 0.1 to 15% by weight, are copolymerized
  • Conjugated dienes and the monomers c and d are particularly suitable for this. If the polymers are prepared by emulsion polymerization, the reaction conditions (emulsifiers,
  • the binder contains the dispersion paint according to the invention in addition to the aqueous dispersion of the polymer
  • NH 2 groups are to be understood as the amino functions of primary amines as well as the NH 2 groups in hydrazides of carboxylic or sulfonic acids or of hydrazines. Suitable amines are, for example, di-
  • Suitable diamines are, for example, aliphatic diamines with 4 to 16 carbon atoms, in particular 6 to 12 carbon atoms, such as hexamethylenediamine, the alkyl derivatives of which, for. B. 2-methylhexamethylene diamine, 3-methylhexamethylene diamine so
  • C 4 -C 2 o -alkylenediamines in which the alkylene unit is reacted by one or more acid Substance atoms or is interrupted by one or more NH or N -CC 4 alkyl groups for example 1, 10-diamino-4,7-dioxadecane, 1, 12-diamino-4,9-dioxadodecane, diethylene triamine, triethylene tetra min, dipropylenetriamine, 1,7-diamino-4-azamethylheptane, and also C 4 -C 2 o-alkoxydiamines such as bisaminooxybutane.
  • Di- or polyhydrazides of an organic di- or polycarboxylic acid are preferably used as component B.
  • the dihydrazides of dicarboxylic acids are used.
  • Suitable dihydrazides are derived in particular from aliphatic C 2 -C 4 dicarboxylic acids or aromatic C 8 -C 22 dicarboxylic acids.
  • Suitable aliphatic C 2 -C 4 -dicarboxylic acids are, for example, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid,fugic acid or sebacic acid.
  • the dihydrazides of aromatic dicarboxylic acids for example the dihydrazide of phthalic acid, isophthalic acid, terephthalic acid,
  • hydrazides of the above Dicarboxylic acids can be used alone or in a mixture or else in a mixture with diamines.
  • Component B can also have the compounds with more than two NH 2 groups. However, these connections are used only to a minor extent.
  • adipic acid dihydrazide is used as the sole component B.
  • Component B which is used in amounts of 0.01 to 10% by weight, preferably 0.1 to 5% by weight, in particular 0.2 to 2% by weight, based on the polymer, can either be added directly to the polymer dispersion or only during the production of the coating composition.
  • the emulsion paints according to the invention generally contain 30 to 75% by weight and preferably 50 to 65% by weight of non-volatile constituents; this includes all constituents of the dispersion dye that are not water or another solvent, but at least the total amount of binder, filler, pigment and non-volatile solvents, e.g. B. plasticizers, and polymeric auxiliaries. About this does not apply
  • Binder components solids content of components A and B
  • the PVC of the emulsion paints is above 40%, preferably above 45%, and can be up to 85%. In one embodiment of the present invention, it is above 60%.
  • Typical pigments are, for example, titanium dioxide, preferably in the rutile form, barium sulfate, zinc oxide, zinc sulfide, basic lead carbonate, antimony trioxide, lithopone (zinc sulfide + barium sulfate).
  • the emulsion paints can also contain colored pigments, for example iron oxides, carbon black, graphite, luminescent pigments, zinc yellow, zinc green, ultramarine, manganese black, antimony black, manganese violet, Paris blue or Schweinfurt green.
  • the emulsion paints according to the invention can also contain organic color pigments, e.g. B.
  • Suitable fillers include aluminosilicates, such as feldspar, silicates, such as kaolin, talc, mica, magnesite, alkaline earth carbonates, such as calcium carbonate, for example in the form of calcite or chalk, magnesium carbonate, dolomite, alkaline earth metal sulfates, such as calcium sulfate, silicon dioxide, etc.
  • the fillers can be used as individual components. In practice, however, filler mixtures have proven particularly useful, e.g. B. calcium carbonate / kaolin, calcium carbonate / talc.
  • finely divided fillers e.g. B. finely divided calcium carbonate or mixtures of different calcium carbonates with different particle sizes. Mixtures of color pigments and fillers are preferably used to adjust the opacity, hue and depth of color.
  • the usual auxiliaries iv include wetting or dispersing agents, such as sodium or potassium polyphosphates, alkali metal salts of polyacrylic acids, alkali metal salts of polymaleic acid, polyphosphonates, such as 1-hydroxyethane-1, 1-diphosphonic acid sodium, and naphthalenesulfonic acid salts, in particular their sodium salts.
  • the dispersing or wetting agents are usually in one Amount of 0.1 to 0.6 wt .-%, based on the total weight of the emulsion paint, used.
  • auxiliaries iv optionally also comprise thickeners, for example cellulose derivatives, such as methyl cellulose, hydroxyethyl cellulose and carboxymethyl cellulose, furthermore casein, gum arabic, tragacanth gum, starch, sodium alginate, polyvinyl alcohol, polyvinyl pyrrolidone, sodium and ammonium salts of polyacrylic acids, water-soluble copolymers
  • cellulose derivatives such as methyl cellulose, hydroxyethyl cellulose and carboxymethyl cellulose, furthermore casein, gum arabic, tragacanth gum, starch, sodium alginate, polyvinyl alcohol, polyvinyl pyrrolidone, sodium and ammonium salts of polyacrylic acids, water-soluble copolymers
  • Acrylic and methacrylic acid base such as acrylic acid / acrylamide and methacrylic acid / acrylic ester copolymers
  • associative thickeners eg. B. styrene-maleic anhydride,
  • hydrophobically modified polyether urethanes are compounds of the general formula
  • R f is a hydrophobic radical, preferably a linear or branched alkyl radical having 10 to 20 carbon atoms and Et is 1,2-ethylene
  • Sp is C 2 -C 8 -alkylene, cycloalkylene or arylene
  • k is a number in the range from 50 to 1,000 and 1 for a number in the range from 1 to 10, the product k • 1 preferably being in the range from 300 to 1,000.
  • inorganic thickeners e.g. B. bentonite or hectorite can be used.
  • Thickeners are generally used in amounts of 0.1 to 3% by weight, preferably 0.1 to 1% by weight, based on the total weight of the aqueous preparation.
  • auxiliaries iv generally also include defoamers, preservatives or water repellents, biocides, fibers or other constituents.
  • the coating compositions for adjusting the film-forming properties of the binder polymers can also contain so-called film-forming consolidating agents and / or plasticizers. These include, for example, ethylene glycol, propylene glycol, butylene glycol, hexylene glycol, alkyl ethers and ether esters of glycols and polyglycols, butylene glycol, hexylene glycol, e.g. B.
  • Texanol ® from Eastman or technical mixtures of the dibutyl esters of succinic acid, glutaric acid and adipic acid, and also hydrocarbons or their mixtures with or without aromatic constituents, eg. B.
  • Film-forming aids are usually used in amounts of 0.1 to 40% by weight, based on the polymer P present in the preparation, so that the preparation has a minimum film-forming temperature ⁇ 15 ° C. and preferably in the range from 0 to 10 ° C.
  • the emulsion paints according to the invention are stable fluid systems which can be used to coat a large number of substrates.
  • Suitable substrates are, for example, wood, concrete, metal, glass, ceramics, plastic, plaster, wallpaper, painted, primed or weathered substrates.
  • the paints produced using the emulsion paints according to the invention are notable for high wet abrasion resistance and good adhesion in the wet state.
  • the paints are not sticky and such coatings are characterized by high blocking resistance.
  • the advantageous properties of the emulsion paints according to the invention are presumably due to the fact that the crosslinking component B is not in the polymer phase, but primarily in the aqueous phase.
  • the reaction takes place only in the drying step and then primarily on the carbonyl groups on the surface of the polymer particles.
  • Crosslinking therefore primarily occurs between the polymer particles, but not within the polymer particles. This increases the blocking resistance of the coatings.
  • the pigment binding power and thus the wet abrasion resistance of the emulsion paints is improved at the same time.
  • An improved wet abrasion resistance ie an improved mechanical stability of the coating in the moist state, in particular with regard to abrasive influences, is favorable for the weather stability of the coatings and also has the effect that the coatings can be washed off. At the same time, the elasticity of the paint is retained.
  • the advantageous properties of the binder based on component A also have an effect on emulsion paints with lower pigment volume concentrations. Accordingly, the use of the binders from component A and optionally component B to improve the wet abrasion resistance of aqueous emulsion paints is also an object of the present invention.
  • the mean particle size (z mean) of the polymer particles was determined by dynamic light scattering (photon correlation spectroscopy) on a 0.01% by weight dispersion in water at 23 ° C. using an Autosizer IIc from Malvern Instruments, England, determined. The average diameter of the cumulant evaluation (cumulant z-average) of the measured autocorrelation function is given.
  • the minimum film-forming temperature (MFT) of the polymer dispersions was determined based on Ulimann's Encyclopedia of Industrial Chemistry, 4th edition vol. 19, VCH Weinheim 1980, p. 17.
  • a so-called film-forming bench metal plate to which a temperature gradient was attached
  • the aqueous polymer dispersion is now applied to the film-forming bench.
  • a clear film forms in the areas of the film image bank, the temperature of which is above the MFT, whereas a white powder forms in the cooler areas.
  • the MFT is determined visually based on the known temperature profile of the plate.
  • Monomer emulsion 227.73 g water 21.11 g of emulsifier solution 1 47.50 g of emulsifier solution 2 356.25 g of methyl methacrylate 502.55 g of n-butyl acrylate 19.00 g of methacrylic acid 72.20 g of a 25 wt. -% solution of N- (2-methacryloxyethyl) iinidazolidin-2-one in methyl methacrylate.
  • the abrasion resistance is determined according to ASTM D2486 using a "Gardner” scrubbing machine and a standardized scrubbing medium (abrasive type SC-2).
  • the blocking resistance was determined in accordance with ASTM D4946.
  • the dispersion paints made of II were applied to Leneta foils using a box squeegee (3 MIL; gap height 75 ⁇ m).
  • the foils were then dried for 24 hours under standard climatic conditions.
  • the dried, coated foils were then cut into 3.8 x 3.8 cm squares.
  • the squares were placed with the coated sides on top of one another and placed between two glass plates. A weight of 2 kg was placed on these glass plates. This assembly was kept at 50 ° C for 24 hours. Then it was examined how the foils can be removed from one another. This was based on an evaluation scale from 0 to 10:
  • Wet adhesion was determined as follows: In a first step, the Leneta films were coated with a solvent-based alkyd resin lacquer (Glasurit EA, high-gloss lacquer from BASF deco GmbH, Cologne) with a box doctor blade (gap height 180 ⁇ m). The films were dried for 24 hours in a standard climate chamber and then for 14 days in an oven at 50 ° C. The dispersion paints from II were then applied to the Leneta films coated with alkyd resin as a second coating using an applicator (gap height 250 ⁇ m, 10 MIL). The so obtained

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)

Abstract

La présente invention concerne des peintures-émulsions présentant une concentration pigmentaire volumique > 40 %, qui contiennent comme liant une préparation comportant, comme composant A, au moins une dispersion aqueuse d'un polymérisat P présentant des groupes carbonyle, et, comme composant B, au moins un composé présentant au moins deux groupes NH2 réagissant par rapport aux groupes carbonyle du polymère du composant A. La présente invention concerne également l'utilisation de telles préparations pour l'augmentation de la résistance à l'usure à l'état humide.
EP98963429A 1997-11-10 1998-11-09 Compositions aqueuses constituees d'une dispersion carbonyle-polymere, d'un pigment et de polyamine Withdrawn EP1029006A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1997149643 DE19749643A1 (de) 1997-11-10 1997-11-10 Dispersionsfarben, die als Bindemittel mit Carbonylgruppen funktionalisierte Polymere enthalten
DE19749643 1997-11-10
PCT/EP1998/007143 WO1999024514A1 (fr) 1997-11-10 1998-11-09 Compositions aqueuses constituees d'une dispersion carbonyle-polymere, d'un pigment et de polyamine

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EP1029006A1 true EP1029006A1 (fr) 2000-08-23

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DE19818393A1 (de) * 1998-04-24 1999-10-28 Basf Ag Emulgatorgemisch für die Emulsionspolymerisation
DE10126266A1 (de) * 2001-05-29 2002-12-05 Basf Ag Emulgatorgemisch für die Emulsionspolymerisation
WO2010050387A1 (fr) * 2008-10-31 2010-05-06 協和発酵ケミカル株式会社 Matériau de revêtement aqueux résistant à l’eau
EP2386610B1 (fr) 2010-04-27 2013-06-19 Akzo Nobel Coatings International B.V. Revêtements améliorés à faible dioxyde de titane
JP4749500B1 (ja) * 2010-09-06 2011-08-17 ハニー化成株式会社 水性表面処理剤組成物
UY34399A (es) 2011-10-26 2013-05-31 Akzo Nobel Coatings Int Bv Revestimientos Mejorados de Bajo Costo Energético Libres de Solvente
KR102277492B1 (ko) * 2018-11-20 2021-07-14 주식회사 엘지화학 이차 전지 전극용 바인더 조성물 및 전극 합제

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JP3129518B2 (ja) * 1992-04-24 2001-01-31 ビーエーエスエフディスパージョン株式会社 架橋性水性顔料分散液
AU720104B2 (en) * 1995-12-04 2000-05-25 Rohm And Haas Company Waterborne crosslinkable coating compositions
US5763012A (en) * 1996-10-16 1998-06-09 Basf Aktiengesellschaft Coating of substrates

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JP2001522922A (ja) 2001-11-20
AU743111B2 (en) 2002-01-17
DE19749643A1 (de) 1999-05-12
WO1999024514A1 (fr) 1999-05-20
AU1871599A (en) 1999-05-31

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