DE102005010967A1 - Aqueous paint compositions for wood - Google Patents

Abstract

The invention relates to aqueous coating compositions for wood, consisting of at least one binder, a modified ketone / aldehyde resin and optionally auxiliaries and additives.

Description

The Invention relates to aqueous Paint compositions for Wood consisting of at least one binder, a modified Ketone / aldehyde resin and optionally auxiliaries and additives.

used are the coating compositions for exterior and interior painting of objects made of wood, the coating being largely free of formaldehyde is. The coating compositions are suitable for all customary application methods, which are used in modern wood finishing. The paint compositions are characterized by a particularly high drying rate as well by a particularly high hardness with very good elasticity and adhesion properties.

Items out Wood usually becomes provided with an organic coating (see "Römpp Lexikon, Paints and printing inks, publisher Ulrich Zorll, Georg Thieme Verlag, Stuttgart, 1998 "), so - ever according to application - on the one hand to protect the wood (eg protection of the object from aging, plant or animal pests, Weather, Penetration of water, mechanical destruction, pollution, etc.). On the other hand take over the organic coatings decorative functions such. B. Structure and support grain of the wood, Compensate for defects, coloring or Cover.

Either in the industrial wood refinement as well as in the DIY sector is a quick drying of the paint desirable to a fast To ensure further processing and defects caused by e.g. Contaminations such as dust, Dirt, insects etc., to avoid.

Around a sufficiently high protection against z. B. mechanical stress to ensure, is one possible high hardness the coating desired. However, sinks at usual Coatings with increasing hardness the elasticity. However, good elastic properties are required because wooden objects more or less soft and thus deformable and z. B. by varying humidity of a constant volume change subject. Very good adhesion properties are for the permanent Protection of the substrate is essential.

hard resins based on ketones and aldehydes are known to reduce the hardness of To increase coating materials.

Water-dispersible condensation products of ketones and aldehydes or their derivatives or reaction products which may contain such products are described in US Pat EP 0 617 103 A1 . EP 0838485 . EP 0838486 ( DE 19643704 ) DE 25 42 090 DE-OS 31 44 673 and DE-OS 3406474 (US Pat. EP 0154835 ).

In DE-OS 25 42 090 sulfonic acid groups carrying water-soluble compounds described, which deviates from the method according to the invention in a common Condensation reaction of cycloalkanone, formaldehyde and alkali bisulfite available are.

In DE-OS 31 44 673 become water-soluble condensation products lists which also by joint implementation of ketones, aldehydes and acid groups introductory Compounds are obtained. Examples of the latter are sulfites, amidosulfonic acid, aminoacetic acid and Phosphorous acid.

To DE-OS 25 42 090 and DE-OS 31 44 673 are electrolyte-containing Products (eg, Na ions). Such resins worsen However, among other things, the water resistance of coating systems.

The EP 0 617 103 A1 describes the reaction of polyisocyanates (a) and dihydroxyl compounds (b) with a molecular weight of 500 to 5000, which does not convert into ionic groups (eg carboxylic acid groups), but other functional groups such as ester or ether groups (see 3, lines 17 - 21). The polyurethane thus obtained is still with a compound (c) which contains not only NCO-reactive groups nor a group convertible into an ionic group, and optionally with diols or polyols (d) having a molecular weight of 60 to 500, which are no further functional Wear groups (see page 4, lines 5 to 15), implemented. Subsequently, this reaction product is reacted with a condensation resin and transferred to the aqueous phase.

In DE 3406474 ( EP 0154835 ) describes aqueous dispersions of ketone resins or ketone / aldehyde resins using organic protective colloids. The disadvantage that protective colloids remain in the subsequent coating and can adversely affect properties such as resistance to water and moisture, prevents their use in high-grade coating compositions.

EP 0838485 describes esterified products. It is known that ester groups hydrolyze resulting in polymer degradation and negatively affecting storage stability. In addition, a reaction or incompatibility with pigments can be caused by freely accessible acid groups.

• I. hydroxylhaltigen Keton-, Keton/Aldehyd-, Harnstoff/Aldehyd-Harzen oder deren hydrierten Folgeprodukten und
• II. mindestens einem hydrophil modifizierten Isocyanat und/oder Polyisocyanat mit mindestens einer freien NCO-Gruppe, erhältlich durch Umsetzung mindestens eines Isocyanats und/oder Polyisocyanats mit Verbindungen, die zusätzlich zur hydrophilen oder potentiell hydrophilen Gruppe mindestens eine gegenüber Isocyanatgruppen reaktionsfähigen Funktion aufweisen und die einen gemäß dem Zerewitinoff-Test aktiven Wasserstoff besitzen, sowie mindestens eine hydrophile Gruppe und/oder eine potentiell hydrophile Gruppe besitzen,

und anschließender Vermengung des neutralisierten Harzes mit Wasser. EP 0838486 describes aqueous resin dispersions obtainable by reaction or proportionate reaction of

• I. hydroxyl-containing ketone, ketone / aldehyde, urea / aldehyde resins or their hydrogenated derivatives and
• II. At least one hydrophilic modified isocyanate and / or polyisocyanate having at least one free NCO group, obtainable by reacting at least one isocyanate and / or polyisocyanate with compounds which have at least one isocyanate-reactive function in addition to the hydrophilic or potentially hydrophilic group; have active hydrogen according to the Zerewitinoff test and possess at least one hydrophilic group and / or one potentially hydrophilic group,

and then mixing the neutralized resin with water.

task The present invention was to provide aqueous coating compositions for the Outside- and interior painting of objects Made of wood, the coating is largely free from Formaldehyde should be. The paint compositions should have a high Have drying speed and a high hardness at good elasticity and adhesion properties of the dried film.

The The object underlying the invention was able to surprisingly by the Use of special coating compositions, which are described in more detail below be solved become.

• A) 20 bis 95 Gew.-% mindestens eines wässrigen Bindemittels, und
• B) 5 bis 80 Gew.-% eines hydrophilierten Keton/Aldehyd-Harzes und/oder eines hydrophilierten, hydrierten Keton/Aldehyd Harzes, und C) 0 bis 75 Gew.-% mindestens eines Zusatzstoffes, wobei die Summe der Gewichtsangaben von Komponente A) bis C) 100 Gew.-% beträgt.

The invention relates to aqueous coating compositions for the exterior and interior painting of objects made of wood, wood materials, such. As medium-density fiberboard (MDF) or high-density fiberboard (HDF), or wood-like objects, such. B. wood-laminated or wood-functional objects, containing substantially

• A) 20 to 95 wt .-% of at least one aqueous binder, and
• B) from 5 to 80% by weight of a hydrophilized ketone / aldehyde resin and / or a hydrophilized, hydrogenated ketone / aldehyde resin, and C) from 0 to 75% by weight of at least one additive, wherein the sum of the weights of component A ) to C) is 100% by weight.

It It was found that the combination of the below described Paint compositions of components A) to C) all required Fulfill criteria.

Component A)

The essential to the invention aqueous Binders A) are used in amounts of from 20 to 95% by weight, preferably from 30 to 80 wt .-% used.

Prefers become watery Binder, from the group of polyurethanes, polyacrylates, polyethers, polyesters, Alkyd resins, cellulose ethers, derivatives of cellulose, polyvinyl alcohols and derivatives, rubbers, maleate resins, phenol / urea-aldehyde resins, Aminoplasts (eg melamine, benzoguanamine resins), epoxy acrylates, Epoxy resins, silicic acid esters and alkali metal silicates (eg waterglass) and / or silicone resins. The aqueous Binders can foreign and / or self-crosslinking, air-drying (physically drying) and / or oxidatively curing.

Component B)

The Invention essential component B) is used in amounts of 5 to 80 Wt .-%, preferably from 10 to 60 wt .-% used.

• I. hydroxygruppenhaltigen Keton/Aldehydharzen oder deren hydrierten Folgeprodukten und
• II. mindestens einem hydrophil modifizierten Isocyanat und/oder Polyisocyanat mit mindestens einer freien NCO-Gruppe, erhältlich durch Umsetzung mindestens eines Isocyanats und/oder Polyisocyanats mit Verbindungen, die zusätzlich zur hydrophilen oder potentiell hydrophilen Gruppe mindestens eine gegenüber Isocyanatgruppen reaktionsfähigen Funktion aufweisen,

und anschließender Vermengung des ggf. neutralisierten Harzes mit Wasser.As component B) are aqueous resin dispersions obtainable by reaction or proportionate reaction of

• I. hydroxy-containing ketone / aldehyde resins or their hydrogenated derivatives and
• II. At least one hydrophilically modified isocyanate and / or polyisocyanate having at least one free NCO group obtainable by reacting at least one isocyanate and / or polyisocyanate with compounds which, in addition to the hydrophilic or potentially hydrophilic group, have at least one isocyanate-reactive function,

and subsequent mixing of the optionally neutralized resin with water.

When Ketones for the preparation of ketone / aldehyde resins (component I.) are suitable all ketones, in particular acetone, acetophenone, methyl ethyl ketone, Heptanone-2, pentanone-3, methyl isobutyl ketone, cyclopentanone, cyclododecanone, Mixtures of 2,2,4- and 2,4,4-trimethylcyclopentanone, Cycloheptanone and cyclooctanone, cyclohexanone and all alkyl-substituted ones Cyclohexanones having one or more alkyl radicals, in total Have 1 to 8 hydrocarbon atoms, individually or in mixture. As examples of alkyl-substituted cyclohexanones, 4-tert-amylcyclohexanone, 2-sec-butyl cyclohexanone, 2-tert-butylcyclohexanone, 4-tert-butylcyclohexanone, 2-methylcyclohexanone and 3,3,5-trimethylcyclohexanone.

It is basically also possible, although less preferred to use ketones that have more functional groups, such as. B. amino and / or acid groups feature.

in the general can but all in the literature for Ketone and ketone / aldehyde resin syntheses as suitable called ketones, usually all C-H-acidic ketones are used.

Prefers ketone / aldehyde resins based on acetophenone, cyclohexanone, 4-tert-butylcyclohexanone, 3,3,5-trimethylcyclohexanone and heptanone alone or in admixture.

When Aldehyde component of the ketone / aldehyde resins (component I.) are suitable in principle unbranched or branched aldehydes, such as. B. Formaldehyde, acetaldehyde, n-butyraldehyde and / or isobutyraldehyde, valeric aldehyde as well as dodecanal. In general, all in the literature for ketone / aldehyde resin syntheses be used as suitable called aldehydes. It is preferred however, formaldehyde is used alone or in mixtures.

The needed Formaldehyde is usually as about 20 to 40 wt .-% aqueous or alcoholic (eg, methanol or butanol) solution. Other uses of formaldehyde such. B. also the use of para-formaldehyde or trioxane are also possible. aromatic Aldehydes, such as. As benzaldehyde, may in mixture with formaldehyde Also included.

Especially are preferred as starting compounds for the ketone / aldehyde resins of Component I. Acetophenone, cyclohexanone, 4-tert-butylcyclohexanone, 3,3,5-trimethylcyclohexanone and heptanone alone or in mixture and formaldehyde.

The Resins of ketone and aldehyde can also in the presence of a suitable catalyst with hydrogen when pressed be hydrogenated from up to 300 bar. This is part of the carbonyl groups of the ketone / aldehyde resin converted into secondary hydroxy groups. For resins of aldehydes and ketones, which in addition to carbonyl grouping on more hydrogenatable functions such. B. aromatic structures, may also these other structures are converted by suitable hydrogenation become. In the case of z. B. aromatic structures are cycloaliphatic Structures preserved.

The possibly necessary hydrophilic modification takes place for. B. by implementation of the resin I with a component II, consisting of at least a hydrophilic modified isocyanate and / or polyisocyanate with at least one free NCO group, obtainable by reaction at least an isocyanate and / or polyisocyanate with compounds in addition to the hydrophilic or potentially hydrophilic group - i. such groups that become hydrophilic only after neutralization - at least one isocyanate-reactive function have such. B. hydroxy or amino groups.

Examples for such Compounds for the hydrophilic modification of (poly) isocyanates are amino acids, hydroxy sulfonic acids, aminosulfonic and hydroxycarboxylic acids. Preference is given to using dimethylolpropionic acid or derivatives thereof. The hydrophilic modification can also be done with nonionic groups (eg with polyethers) or already neutralized compounds be made.

Hydroxycarboxylic acids such as especially dimethylolpropionic acid are therefore particularly preferred because they are neutralized with volatile Bases, such as As amines, strong hydrophilic effect show. to Evaporation of the volatile However, this effect decreases greatly. Lose coatings therefore not by z. B. Moisture has its protective function, because a swelling does not take place.

The dimethylolpropionic will also especially preferred because they are over their two hydroxyl groups two hydrophobic polyisocyanates (potentially) hydrophilic to modify.

Suitable polyisocyanates for the preparation of II. Are preferably di- to tetrafunctional polyisocyanates. Examples of these are cyclohexane diisocyanate, methylcyclohexane diisocyanate, ethylcyclohexane diisocyanate, propylcyclohexane diisocyanate, methyldiethylcyclohexane diisocyanate, phenylene diisocyanate, toluene diisocyanate, bis (isocyanatophenyl) methane, propane diisocyanate, butane diisocyanate, pentane diisocyanate, hexane diisocyanate, such as hexamethylene diisocyanate (HDI) or 1,5-diisocyanato-2-methylpentane (MPDI). Heptane diisocyanate, octane diisocyanate, nonane diisocyanate such as 1,6-diisocyanato-2,4,4-trimethylhexane or 1,6-diisocyanato-2,2,4-trimethylhexane (TMDI), nonane triisocyanate such as 4-isocyanatomethyl-1,8-octane diisocyanate (TIN), decane and triisocyanate, undecanediol and triisocyanate, dodecandi- and triisocyanates, isophorone diisocyanate (IPDI), dicyclohexylmethane-4,4'-diisocyanate (H ₁₂ MDI), isocyanatomethylmethylcyclohexyl isocyanate, 2.5 (2.6) Bis (isocyanato-methyl) bicyclo [2.2.1] heptane (NBDI), 1,3-bis (isocyanatomethyl) cyclohexane (1,3-H ₆ -XDI) or 1,4-bis (isocyanatomethyl) cyclohexane (1, 4-H ₆ -XDI) alone ode in mixture.

Another preferred class of polyisocyanates are the compounds prepared by di- or trimerization, allophanatization, biuretization and / or urethanization of simple diisocyanates with more than two isocyanate groups per molecule, for example the reaction products of these simple diisocyanates, such as IPDI, HDI and / or H. ₁₂ MDI with polyhydric alcohols (for example glycerol, trimethylolpropane, pentaerythritol) or polyvalent polyamines or the triisocyanurates obtainable by trimerization of the simple diisocyanates, for example IPDI, HDI and H ₁₂ MDI.

Particularly preferred is a hydrophilically modified polyisocyanate (Π) from dimethylolpropionic acid or derivatives thereof and IPDI and / or TMDI and / or H ₁₂ MDI and / or HDI in a molar ratio of 1: 2.

The Preparation of component B) takes place in the melt or in solution of a suitable, organic solvent, that - if desired - after the Production can be separated by distillation.

preferred Solid contents in the case of a reaction in solution are from 30 to 95% by weight, particularly preferably 60 to 80 wt .-%.

When suitable auxiliary solvents become low-boiling inert solvents used, which do not form a miscibility gap with water, at least over wide areas, a boiling point at atmospheric pressure below 100 ° C own and therefore, if desired by distillation to a residual content of less than 2 Wt .-% and in particular of less than 0.5 wt .-% based on the finished Dispersion or aqueous Remove the solution and reuse. Suitable solvents of this type are for. As acetone, methyl ethyl ketone or tetrahydrofuran. Basically suitable are also higher boiling solvent such as For example, n-butyl glycol, di-n-butyl glycol and N-methylpyrrolidone, which then remain in the dispersion.

One Advantage of the component B) is but also in that on organic solvents in the finished aqueous Resin dispersion completely can be dispensed with and yet solids-rich, stable dispersions to be obtained.

The Implementation of I and Π leaves one preferably proceed to the extent that a residual NCO content of 1 % NCO (determination according to DIN 53185) is exceeded, and especially preferably progresses so far that the residual NCO content of the product from I and II is in the range of 0.1 to 0.5% NCO. In the reaction can be unreacted by I and II remaining NCO functions, According to the prior art, either chain extension reactions, z. B. by adding polyamines or water use, or possibly let yourself a chain termination by addition to NCO groups monofunctional Initiate compounds (eg monoalcohols, monoamines).

The products according to the invention can in the case of potentially hydrophilic groups with a suitable neutralizing agent be added, which then water-dilutable, water-dispersible or water-soluble Products are obtained.

The Neutralization of the potentially hydrophilic groups of the inventively prepared Resins can be made with inorganic and / or organic bases, such as As ammonia or organic amines. Preferably used become primary, secondary and / or tertiary Amines, such as Ethylamine, propylamine, dimethylamine, dibutylamine, Cyclohexalamine, benzylamine, morpholine, piperidine and triethanolamine. Particular preference is given to volatile, tertiary Amines, in particular dimethylethanolamine, diethylethanolamine, 2-dimethylamino-2-methyl-1-propanol, Triethylamine, tripropylamine and tributylamine in the case of anionic potential groups. So-called cationic potential ionogenic Groups can be neutralized with inorganic and / or organic acids, such as Acetic acid, formic acid, Phosphoric acid, Hydrochloric acid, Etc..

Of the Neutralization degree is preferably 50 to 130% of the neutralization amount which is for a stoichiometric Neutralization is necessary.

The neutralized, hydrophilic resin or the resin solution is passed either in Water or preferably added while stirring with water. Before adding water If appropriate, the reaction product of I and II with other non-hydrophilic resins or other components combined and then dispersed together. This measure can be a technically advantageous high solids content of the dispersions from above Achieve 45 wt .-%. in principle the solids are in ranges between 20 and 70 wt .-%, preferably between 25 and 60 wt .-%.

To In the dispersing, the organic auxiliary solvent may preferably be used in the Vacuum removed and, if necessary, be worked up again.

Component C)

The Component C) is used in amounts of 0 to 75 wt .-%, preferably from 5 to 60 wt .-% used.

When Component C) are suitable auxiliaries and additives such as Inhibitors, organic solvents, surfactants Substances, oxygen and / or radical scavengers, catalysts, light stabilizers, Color lighteners, photosensitizers and initiators, additives to influence rheological properties such. B. thixotropic agent and / or thickening agents, leveling agents, anti-skinning agents, Plasticizer, defoamer, Antistatic agents, lubricants, wetting and dispersing agents, preservatives such as As well as fungicides and / or biocides, thermoplastic additives, Dyes, pigments, matting agents, fire protection equipment, internal release agents, fillers, isocyanate and / or propellant.

Preparation of the coating compositions from the components A) to C):

The Preparation of the coating compositions is carried out by intensive mixing of the components at temperatures of 20 to 80 ° C ("textbook of paint technology", Th. Brock, M. Groteklaes, P. Mischke, ed. V. Zorll, Vincentz Verlag, Hannover, 1998, page 229 ff.).

Not liquid Components may first be mixed in suitable solvents before mixing or water in solution brought, then the remaining components are added with stirring. In the case of z. B. pigments and / or fillers a dispersion takes place.

Of the Formaldehyde content of the coating compositions is less than 100 ppm, preferably below 50 ppm and more preferably below 10 ppm.

The claimed, aqueous Paint compositions are for the outside and interior painting of objects made of wood, wood materials or wood-like objects suitable. They have a high drying speed and therefore also very high blocking resistance.

The dried, hardened or crosslinked films have a high hardness with good elasticity and Adhesive properties, what z. In good to very good values when scratching or pendulum or Buchholzhärte expresses. Penetration ability and substrate wetting on various wood and wood materials and the abrasion resistance are very good. In addition, these films exhibit a high solvent resistance on.

The claimed, aqueous Paint compositions indicate the wood substrates used a flawless course and are free of surface defects, such as craters and wetting disorders.

The claimed, aqueous Paint compositions have a solids content of 15% to 80% %, preferably from 20% to 60%.

The coating compositions according to the invention are called fillers, Putties, impregnations, wood coatings such as As glazes, primers, primers, fillers, base and topcoats for wood and / or wood-like Substrates used.

The The following examples are intended to illustrate the invention made but further do not restrict their scope:

Production of the component B)

1. Preparation of the adduct

To a mixture of 134 g of dimethylolpropionic acid, 380 g of acetone and 6 g of a 10 wt .-% solution of Dibutyltin dilaurate in acetone with stirring 444 g of isophorone diisocyanate added so that the exothermic reaction remains well manageable. It is at 60 ° C heated and held this temperature up to an NCO number of 9.2%.

To the cooled to room temperature solution Put it under stirring 2300 g of a 55 wt .-% strength acetone solution of a hydrogenated acetophenone / formaldehyde resin (resin SK of Degussa AG) and 12 g of a 10 wt .-% acetone DBTL solution and warmed up to the reflux temperature of about 60 ° C. You leave continue stirring at this temperature until the NCO number of solution 0.1% NCO has fallen below.

2. Transfer to the watery phase

Alternative A:

The under 1) prepared solution of the hydrophilic modified resin is neutralized at room temperature with stirring by adding 89 g of dimethylaminoethanol and dispersing the solution Add 4200 g of demineralized water while stirring. The Auxiliary solvent Acetone and partially water is removed in vacuo and receives a storage-stable, finely divided, slightly opalescent resin dispersion with a solids content of about 33 wt .-%.

Alternative B:

The under 1) prepared solution are added with stirring with 3300 g of a 55 wt .-% strength acetone solution of a hydrogenated acetophenone / formaldehyde resin (Resin SK from Degussa AG), neutralized at room temperature with stirring with 89 g of dimethylaminoethanol and dispersed through the solution Add 4400 g of demineralized water while stirring. The Auxiliary solvent Acetone and partially water is removed in vacuo and receives a storable whitish Dispersion having a solids content of about 50 wt .-%.

Properties of the dispersions

storage stability

• * Rotationsviskosimeter ; D: 100 bis 900 s^-1

The dispersions A and B according to point 2) were investigated for changes in pH, viscosity and visual appearance on storage stability.

• * Rotational viscometer; D: 100 to 900 s ^-1

Example of a paint composition:

VE H₂O = voll entsalztes Wasser
Alle Angaben in Gramm/gThe components are mixed with vigorous stirring under the dissolver and homogenized for 10 min.

VE H ₂ O = fully demineralized water
All data in grams / g

The Paints were knife-coated on pine wood panels and glass plates in layer thicknesses of 200 μm applied and over dried at room temperature.

0 = sehr gute Haftung; 10 = keine HaftungAll films are flawless and free of surface defects. Knife scratch adhesion on pine wood panels:

0 = very good adhesion; 10 = no liability

Diagramm 1: Notwendige Zeit, bis Lackierungen staubtrocken sind Diagamm 1 shows the differences as of when the finishes are dust-dry. It can be seen that with increasing proportion of component B, the drying rate increases significantly.

Diagram 1: Necessary time until paints are dust-dry

The Diagamm 2 shows the development of the surface hardness (pendulum hardness after King). It can be seen that as the proportion of component B increases, pendulum hardness becomes significant increases.

Diagramm 2: Entwicklung der Pendelhärte der unterschiedlichen Lackierungen in Abhängigkeit der Zeit

Diagram 2: Development of the pendulum hardness of the different coatings as a function of time

Claims (33)

aqueous Paint composition for the coating of objects essentially comprising wood A) 20 to 95 wt .-% at least an aqueous one binder, and B) 5 to 80 wt .-% of a hydrophilicized Ketone / aldehyde resin and / or a hydrophilized, hydrogenated Ketone / aldehyde resin, and C) 0 to 75 wt .-% at least an additive, where the sum of the weights of Component A) to C) is 100 wt .-%. aqueous Paint composition according to claim 1, characterized in that the solids content of the coating compositions is between 15% by weight up to 80% by weight, the formaldehyde content of the coating compositions below 100 ppm, preferably below 50 ppm and more preferably below 10 ppm and the content organic solvent below 20% by weight, preferably below 10% by weight, more preferably is less than 2% by weight. aqueous Lacquer composition according to claims 1 and 2, characterized that as component A) aqueous Binders from the group of polyurethanes, polyacrylates, polyethers, Polyesters, alkyd resins, cellulose ethers, derivatives of cellulose, polyvinyl alcohols and derivatives, rubbers, maleate resins, phenol / urea-aldehyde resins, aminoplasts (eg melamine, benzoguanamine resins), epoxy resins, silicic acid esters and alkali silicates (eg, water glass), silicone resins, fluorine-containing Polymers can be used alone or in mixture. aqueous Paint composition according to claim 3, characterized in that the preferred aqueous binder as component A) and / or self-crosslinking, air-drying (physically drying) and / or oxidatively curing are. aqueous Paint composition according to one of the preceding claims, thereby in that used as component B) aqueous resin dispersions become available through implementation or pro-rata implementation of I. hydroxy-containing Ketone / aldehyde resins or their hydrogenated derivatives and II. at least one hydrophilic modified isocyanate and / or polyisocyanate with at least one free NCO group, obtainable by reaction at least an isocyanate and / or polyisocyanate with compounds in addition to hydrophilic or potentially hydrophilic group at least one towards isocyanate groups reactive Have function, and subsequent mixing of the possibly neutralized resin with water. aqueous Paint composition according to claim 5, characterized in that used as component I for the preparation of component B) resins which contain C-H-acidic ketones. aqueous Paint composition according to claim 6, characterized in that C-H-acidic ketones selected from acetone, acetophenone, methyl ethyl ketone, heptanone-2, pentanone-3, Methyl isobutyl ketone, cyclopentanone, cyclododecanone, mixtures of 2,2,4- and 2,4,4-trimethylcyclopentanone, cycloheptanone and cyclooctanone, Cyclohexanone and all alkyl-substituted cyclohexanones with a or more alkyl radicals containing a total of 1 to 8 carbon atoms be used singly or in mixture. aqueous Paint composition according to claim 7, characterized in that as alkyl-substituted cyclohexanones 4-tert-amylcyclohexanone, 2-sec-butylcyclohexanone, 2-tert-butylcyclohexanone, 4-tert-butylcyclohexanone, 2-methylcyclohexanone and 3,3,5-trimethylcyclohexanone alone or in mixture. aqueous Paint composition according to claim 5, characterized in that used as component I for the preparation of component B) resins which contain aldehydes. aqueous Paint composition according to one of the preceding claims, characterized characterized in that as an aldehyde component for the preparation of Component I of component B) formaldehyde, acetaldehyde, n-butyraldehyde and / or iso-butyraldehyde, valeric aldehyde, dodecanal alone or be used in mixtures. aqueous Paint composition according to one of the preceding claims, characterized characterized in that hydrogenation products of the resins of acetophenone, Cyclohexanone, 4-tert-butylcyclohexanone, 3,3,5-trimethylcyclohexanone, heptanone alone or in a mixture and Formaldehyde be used as component I. aqueous Paint composition according to one of the preceding claims, characterized in that component II. of component B) is prepared is using tert. Amino alcohols, aminocarboxylic acids, hydroxysulfonic acids, aminosulfonic acids or / and hydroxycarboxylic acids. aqueous Paint composition according to one of the preceding claims, characterized in that component II. of component B) is prepared is using dimethylolpropionic acid. aqueous Paint composition according to one of the preceding claims, characterized characterized in that component II. of component B) before reaction already neutralized with component I. aqueous Paint composition according to one of the preceding claims, characterized characterized in that for the production of Π. component B) di bis tetrafunctional polyisocyanates are used. aqueous Paint composition according to one of the preceding claims, characterized in that for the preparation of II. of component B) polyisocyanates with aromatic, aliphatic and / or cycloaliphatic bound Isocyanate groups or mixtures of these can be used. Aqueous paint composition according to one of the preceding claims, characterized in that 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (isophorone diisocyanate; IPDI), trimethylhexamethylene diisocyanate (TMDI), 1,6-diisocyanatohexane (HDI), bis (4-isocyanatohexyl) Methane (H ₁₂ MDI) can be used alone or in mixture. aqueous Paint composition according to one of the preceding claims, characterized in that for the preparation of II. of component B) polyisocyanates be used with biuret, uretdione or isocyanurate structure. aqueous Paint composition according to one of the preceding claims, characterized in that for the preparation of II. of component B) polyisocyanates from the reaction of polyhydric alcohols and / or amines be used with monomeric isocyanates. aqueous Paint composition according to one of the preceding claims, characterized in that, for the preparation of II. of component B), dimethylolpropionic acid and Isophorone diisocyanate, trimethylhexamethylene diisocyanate, 1,6-diisocyanatohexane and / or bis (4-isocyanatohexyl) methane in a molar ratio of 1 : 2 are used. aqueous Lackzusanmensetzung according to any one of the preceding claims, characterized characterized in that the reaction of I. and II. of the component B) and the subsequent Dispersing in bulk or in the presence of an auxiliary solvent respectively. aqueous Lacquer composition according to the preceding claim, characterized that the auxiliary solvent used a boiling point below 100 ° C at 1013 hPa. aqueous Lacquer composition according to the preceding claim, characterized that the auxiliary solvent used Acetone and / or methyl ethyl ketone and / or tetrahydrofuran. aqueous Paint composition according to one of the preceding claims, characterized characterized in that the neutralization of component B) with inorganic or organic bases. aqueous Lacquer composition according to the preceding claim, characterized that for neutralization dimethylethanolamine or / and diethylethanolamine and / or 2-dimethylamino-2-methyl-1-one be used propanol. aqueous Lacquer composition according to any preceding claim, characterized that for neutralization 50 to 130% of the neutralization amount, the for one stoichiometric Neutralization is necessary is used. aqueous Lacquer composition according to any preceding claim, characterized that before adding water one or more non-water soluble or dilutable Components are added. aqueous Lacquer composition according to any preceding claim, characterized that as component C) auxiliaries and additives are used. Aqueous paint composition according to any preceding claim, characterized in that as component C) auxiliaries and additives can be used alone or in a mixture selected from the group of inhibitors, organic solvents, surface-active substances, oxygen and / or radical scavengers, catalysts, light stabilizers, color brighteners, photosensitizers and initiators, additives for influencing rheological Properties such. As thixotropic and / or thickening agents, leveling agents, anti-skinning agents, defoamers, plasticizers, antistatic agents, lubricants, wetting and dispersing agents, preservatives such. As well as fungicides and / or biocides, thermoplastic additives, dyes, pigments, matting agents, fire protection equipment, internal release agents, fillers, Isocyanathärter and / or blowing agents. Process for the preparation of aqueous coating compositions essentially containing A) 20 to 95 wt .-% of at least one aqueous binder, and B) 5 to 80 wt .-% of a hydrophilicized Ketone / aldehyde resin and / or a hydrophilized, hydrogenated Ketone / aldehyde resin, and C) 0 to 75 wt .-% at least an additive, where the sum of the weights of Component A) to C) is 100 wt .-%, by intensive mixing by stirring and / or dispersing the components at temperatures of +20 to +80 ° C. Use of the aqueous Paint compositions according to at least one of the preceding claims for painting of objects. Use of the aqueous Paint compositions according to at least one of the preceding claims for painting of objects made of wood, wood materials, such. B. medium density fiberboard (MDF) or High density fibreboard (HDF), or wood-like objects, such as z. As wood-laminated or -funierten objects. Coated articles made of wood, wood-based materials, such as B. medium density fiberboard (MDF) or high density fiberboard (HDF), or wood-like objects such as As wood-laminated or -funierte objects, manufactured and / or finished with a paint composition according to at least one of the preceding Claims.