MXPA98006664A - Process for the preparation of compositions of aqueous coating for the interior painting of vehicu - Google Patents

Abstract

The present invention relates to: invention relates to a multi-step process for the preparation of aqueous coating compositions BM for the painting of vehicle interiors, in which process I, a pre-mix VM is prepared from the components: (A) containing at least one basic paint (A) comprising less than 5% by weight of water, at least one color pigment or special effect, or both, organic solvent, at least one dissolvable binder resin in water or dispersible in water, containing hydroxyl and, optionally, auxiliaries and additives, an aqueous pigment-free component (B) comprising at least one binder containing hydroxyl (B1), (C) or dispersion of a dye. or polyisocyanate, or both (C1) or a mixture of di- or polyisocyanates, or both (C1), or alternatively to (C), (D) an aqueous solution or dispersion of a rheological aid (D1) and subsequently , II.- in order to prepare the composition of aqueous coating BM is added to the premix of VM a solution or an aqueous dispersion of a rheological auxiliary (D1) or, alternatively, as component (C) a solution or dispersion of di- or polyisocyanate, or both, ( C1), prepared in stage I, provided that the respective component (C) or (D) is not present in the previous VM mixture, and finally, the processing of the viscosity is established by adding deionized water as a component (

Description

f "" * ^ Process for the preparation of aqueous coating compositions for the painting of vehicle interiors Field of the invention The invention relates to multi-stage processes for the preparation of aqueous coating compositions BM for the paint of interiors of vehicles, comprising the following stages: I. preparation of a VM premix that includes a pigment-containing component A), a component that contains binder B) and a component C) containing a degrading agent, or a component that controls the rheology D, and, then II. preparation of an aqueous coating composition BM 15 from a pre-mix VM and the component controlling the rheology D) or component C) containing the degrading agent, provided that these components are not present in the premix VM, and the final setting of the process viscosity of the BM coating composition by the addition of deionized water as component E). BACKGROUND ART Multi-component mixing systems are known in an aqueous base for automotive finishing with in-line production or 25 for the new finishing of damaged sites, or both, especially for re-performing automotive finishes. DE-A-42 32 721 discloses two-component mixing systems, consisting of different basic paints, containing less than 5% by weight of water, at least one color or special effect pigment, organic solvent, so optional auxiliaries and additives, and a binder dissoluble in water, and consisting of a water-containing and pigment-free component. The binders used in basic paints comprise at least one water-dispersible or water-dispersible acrylated polyurethane resin or at least one water-soluble or water-dispersible polyacrylate resin, or both. The mixing systems described in DE-A 42 32 721 are preferably used as aqueous coating compositions to produce a basecoat film. After the initial drying of the basecoat films produced in this manner, a topcoat composition is applied. Suitable top layers include both organically dissolved clear coats and 1- or 2- component aqueous coats, and also transparent powder coatings. 2-component clear coats are usually used in an acrylate copolymer containing hydroxyl and a polyisocyanate. Transparent layers of this type are described, for example, in DE-A-34 12 534, DE-A 36 09 519, DE-A-37 31 652 and DE-A-38 23 005. They are also known and describe suitable 1-component clear coatings, based, for example, on a hydroxyl-containing binder and an amino resin hardener, for example, in Kittel, Kehrbuch der Lac e un Beschitungen [Textbook of paints and coatings], Volume IV, Verlag WA , Colo b in der H. Heeremann GmbH, Verlinde-Obersch andorf, 1976. In general, after any period of instantaneous vaporization that may be required, the basic layer is dried together with the top layer. Objective and achievement The requirements in the painting of the components of the production line or in the new automotive finish are based on the great demand of these coatings, in terms of mechanical resistance, for example against impact or roughing by stones. , bright surface and weathering stability, and are based, in turn, on the exterior finish of the automotive components. Said requirements require finishes of multiple, technologically complex layers, for example, the one described above consisting of a basic layer film and a top layer film, whose application is laborious. The finishes of automotive interiors should only meet some of those requirements. In particular, the strict requirements on mechanical resistance, the brightness of the surface of the painting, and the stability to weathering are not as rigorous as in the case of external finishes. In contrast, there are strict requirements regarding the uniformity of the color of the interior and exterior finish. The object of the present invention was, therefore, to modify the current coating compositions, prepared, for example, from mixing systems, for the production of basic layer film in the exterior finish of vehicles, in such a way that it is possible that the interior finish of the vehicles uses constituents of said mixing systems to ensure, in particular, the uniformity of color, and the upper layer films are not necessary in the case of interior finishing. Surprisingly, it has been found that aqueous coating compositions BM for the painting of interiors of vehicles, compositions that conform in an outstanding manner to the specified criteria when pointing to the objective, can be prepared in a simple manner as indicated below: I. a premix VM is prepared consisting of A) different basic paints (A) in accordance with DE-A-42 32 721, and comprising less than 5% by weight of water, at least one color or special effect pigment, or both, organic solvents, and at least one water-soluble or water-dispersible binder containing hydroxyl, preferably a water-dispersible or water-dispersible polyacrylate resin containing hydroxyl (A) with a hydroxyl number from 5 to 40 mg KOH / g or at least one polyurethane resin optionally acrylated, water-soluble or dispersible in water containing hydroxyl (Al) with a hydroxyl number of 10 to 100 mg KOH / g, and B) at least one aqueous component without pigment comprising at least one binder containing optionally hydroxyl (Bl) and C) a solution or dispersion of polyisocyanate (Cl) or a mixture of polyisocyanates (Cl) or, alternatively to C), of D) an aqueous solution or dispersion of a rheological auxiliary (D1). and, after II. In order to prepare the aqueous coating composition BM, as component D) an aqueous solution or an aqueous dispersion or an aqueous solution [sic] of a rheological auxiliary (D1) or, alternatively, as component C) is mixed with a solution or a dispersion of polyisocyanate (Cl) or a mixture of polyisocyanate (Cl) is mixed with the previous VM mixture, provided that the respective component C) or D) is not present in the previous VM mixture and, finally, the process viscosity of the aqueous coating composition by adding deionized water as component E). The spray paints produced in this way can be used for painting interiors of vehicles without the additional application of a top layer. The basic paints (A) used in component A) are preferably free of water.

The di- or polyisocyanates, or both compounds, (Cl) or their mixtures which are preferably used are isomers or mixtures of isomers of aliphatic or cycloaliphatic polyisocyanates, or both, or aromatic di or polyisocyanates, or all of them, in organic or aqueous or in organic dispersion, or aqueous. Embodiment of the invention Components of the waterborne coating composition BM Constituents of the component A) The component A) of the mixing system can include all normal paint pigments, as long as it does not react with the water within a set time, for example inside of the time period between the preparation of the aqueous coating compositions BM, in accordance with the novel process and the application of aqueous coating compositions, and which do not dissolve in water. This component A) may include special effect pigments or color pigment, or both, based on organic or inorganic compounds. In order to ensure a range of use that is as universal as possible and to be able to reach as many nuances as possible, it is preferred to build as component A) a mixing system based on components containing only color pigments and components containing only special effect pigment. To prepare component A) it is possible to use all the special effect pigments that are normally used in the formulation of aqueous coating compositions. Examples of commercially available special effect pigments are aluminum bronzes, chrome-plated aluminum bronzes according to DE-A-36 36 183, stainless steel bronzes and other metallic flake pigments or metal platelets. Pearlescent or interference pigments are also suitable as special effect pigments. Examples of the color pigments based on inorganic compounds are titanium dioxide, iron oxides, natural gas carbon blacks and others. Examples of organic-colored pigments are Indatren blue, Cromophthal red, Irgazino orange, Sicotrans yellow, Heliogen green and others. Preferred hydroxyl-containing binders for use in component A) are polyurethanes which are optionally acrylated, water-soluble or dispersible in water containing hydroxyl (Al) or polyacrylates (A2), or both, already mentioned, which are normally used in compositions Aqueous coating and can be prepared in organic form. In this context, the durability or dispersibility of the resins in water can also be adjusted using the suitable solubilizers as cosolvent or solvent, or both. Critical factors for the selection of binders are, on the one hand, the good storage stability of the organic solution, including, in particular, the ability to prevent the pigments from settling, and, if appropriate, on the other hand, the ability of the basic paint to be incorporated into component B), or vice versa, without problems. Optionally, acrylated (Al) polyurethanes of this type, which are used as binders in component A) of the novel coating composition, and their preparation, are described in, for example, DE-A-40 10 176. The optionally acrylated polyurethane (Al) is preferably prepared by known methods of polyurethane chemistry from the component blocks (Aiia) to (Aiif) described in DE-A-42 32 721. The molecular weight of the resins Polyurethane can - as the person skilled in the art knows - be controlled in particular by the proportion of the functionality of the initial compounds used in accordance with DE-A-42 32 721. Polyurethane resins can be prepared both in bulk and in organic solvents. In DE-A-42 32 721 a detailed description of the quantities of the component blocks (Aiia) a (Aiif) can be taken. According to DE-A-42 32 721 acrylic polyurethane (Al1) resins are prepared by placing a solution of polyurethane resin (Al) in an organic solvent or in an organic solvent mixture and, in this solution, polymerize ethylenically unsaturated monomers or a mixture of ethylenically unsaturated monomers in a free radical polymerization, and convert the product of the reaction thus obtained to an aqueous dispersion. As ethylenically unsaturated monomers, it is possible, in accordance with DE-A-42 32 721, to use virtually all polymerizable free radical monomers, but subject to the normal restrictions for the copolymerizations specified in scheme Q e of Alfrey and P ice, or through the copolymerization parameters, or both methods (see, for example, Brandrup and Immergut, Polymer Handbook, 2nd edition, John Wiley + Sons, New York (1975)). A detailed list of ethylenically unsaturated monomers can be taken from DE-A-42 32 721. The polymers used according to the invention and prepared according to DE-A-42 32 721 must contain groups capable of forming anions, which are neutralized before or during the transfer of polymers from the organic solvent or mixture of solvent to water, which allows the formation of stable aqueous dispersions. The polymers in question can, in addition to the groups capable of forming anions, also include other non-ionic stabilizing groups, for example poly (oxy-alkylene) groups, especially poly (oxyethylene), or poly (oxypropylene) groups, or poly (oxyethylene (oxypropylene), or all of them at the same time) The introduction of groups capable of forming anions into the polymers in question is described, for example, in DE-A-42 32 721. It is further preferred as a component water-soluble or water-dispersible binder of component A) of the novel mixer system of water-dispersible or water-dispersible polyacrylate resin (A2), as described, for example in DE-A-42 32 721. The sum of The proportions by weight of the monomeric components of the polyacrylate resin (A2) described in DE-A-42 32 721 are [sic] selected in nature and quantity [sic] such that the polyacrylate resin (A2) has a number or hydroxyl of 5 to 40, preferably 5 to 35 mg of KOH / g, and an acid number of 20 to 100, preferably 25 to 50 mg of KOH / g and a glass transition temperature (TG) of -40 degrees. C at +60 degrees C, preferably from -20 degrees C to +40 degrees C. A description of the monomers and the preparation of the polyacrylate resins (A2) of DE-A-42 32 721 can be taken. As binders of it is also possible, of course, to use mixtures of the binders (Al) and (A2) and, on the other hand, other water-soluble or water-dispersible binders, which preferably contain hydroxyl groups. It is essential for the invention that the basic paints (A) be essentially free of water, preferably completely free of water. The water content of the basic paints (A) must be less than 5% by weight, based on the total weight of the basic paint (A). As solvents the basic paint (A) contains one or more organic solvents. Examples of organic solvents are, in particular, water-soluble or water-soluble solvents, for example alcohols, esters, ketones, keto esters, glycol ether esters and the like. Preference is given to the use of alcohols and glycol ethers, in particular, preferably, butyl glycol and butanols. In this case, there is the possibility, as described in DE-A-42 32 721, to be used during the effective preparation of the binder solvents which also subsequently remain as solvents of the basic paint. More often, however, the binders are prepared using a separate solvent which, after binder preparation, is gently distilled through vacuum distillation or thin film evaporation and replaced with a solvent remaining in the solution binder, which is then used in basic painting. The solvents of higher boiling point must be water soluble and remain in the polyurethane resin solution used in the basic paint, in order to facilitate the coalescence of the polymer particles during the formation of the film. Component A) can additionally comprise from 0 to 10% by weight, based on A), of auxiliaries and additives of general use. Examples of such defoaming additives are dispersion aids, emulsifiers, leveling agents and others. Component A) preferably contains Aa) from 0.5 to 70% by weight of at least one special effect pigment or at least one color pigment, Ab) from 10 to 80% by weight of at least one water-soluble binder or dispersible in water, containing hydroxyl, Ac) at least one organic solvent and, optionally, Ad) auxiliaries and additives, constituting in all cases the sum of the proportions by weight of the components Aa) to Ad) 100 % by weight of component A). With particular reference to component A) it consists of basic paints (A1) containing only special effect pigments and basic paints (A'1) containing only color pigments. Particularly preferred base paints (A ') based on special effect pigments contain Aa) from 0.5 to 50% by weight of at least one special effect pigment, Ab) from 20 to 80% by weight of water soluble binder or dispersible in water, containing hydroxyl, and Ac) at least one organic solvent, constituting in all cases the sum of the proportions by weight of components Aa) to Ac) 100% by weight. Particularly preferred basic paints (A1 ') based on inorganic color pigments contain Aa) from 1 to 70% by weight of at least one inorganic pigment, Ab) from 10 to 80% by weight of at least one water-soluble binder or dispersible in water, containing hydroxyl and, Ac) at least one inorganic solvent, constituting in all cases the sum of the proportions by weight of components Aa) to Ac) 100% by weight. Particularly preferred basic paints (A11) based on organic color pigment contain Aa) from 1 to 30% by weight of at least one inorganic pigment, Ab) from 10 to 80% by weight of at least one water-soluble binder or dispersible in water, containing hydroxyl and, Ac) at least one organic solvent, constituting in all cases the sum of the proportions by weight of components Aa) to Ac) 100% by weight. It is possible, of course, to use basic paints (A) containing a combination of at least one organic colored pigment and at least one inorganic colored pigment. With regard to additional criteria for basic paints (A), DE-A-41 10 520 can be consulted. Component A) is prepared according to methods known to the person skilled in the art, mixing and, if appropriate, scattering the individual components. For example, the color pigments are generally incorporated by dispersing the respective pigments with one or more of the binders described above, which are preferably used in the form of their solutions in organic solvents. If desired, additional organic solvent may be added to make the dispersion. These pigments are dispersed with the aid of normal apparatuses, for example, pearl mills and sand mills. These special effect pigments are usually incorporated by the homogeneous mixture of special effect pigments with one or more solvents. This mixture is then incorporated by stirring it into the mixture of one or more of the binders described above, with or without the addition of additional organic solvents, through a stirrer or dissolver. The binders are preferably used in the form of their solutions in organic solvents.

The respective proportions of pigment, binder and solvent depend, in this case, as will be familiar to the person skilled in the art, on the flow behavior of the pigment paste, and, therefore, depend on the particular pigment employed. A detailed description of component A) can be taken from DE-A-41 10 520. Constituents of component B) Aqueous component B) is free of pigment and contains at least one binder (Bl). If desired, component B) may additionally contain auxiliaries and additives, one or more binders dissolvable in water or dispersible in water and organic solvents. Binders (Bl) suitable for use in component B) are preferably water-soluble or water-dispersible polyacrylate resins containing hydroxyl, optionally acrylated polyurethane resins (Al) already described in connection with the description of component A) and, in addition, in addition, amino resins, polyester resins, various polyacrylate resins and various polyurethane resins which are dissolvable or dispersible in water and, preferably, contain hydroxyl groups. When used in component B) these binders (Bl) can be used not only as an organic solution, but also, preferably, in a form containing water. The transfer of the resins to the aqueous phase is effected, for example, by neutralizing the carrier groups (groups capable of forming anions or cations, for example, the carboxyl groups), and then transporting the solution with water, with or without withdrawal partial of the organic solvent used in the preparation of the resin, or by direct synthesis of the resin in the presence of water. For further details, the documents describing the preparation of the resins can be consulted (see, for example, DE-A-32 10 051, DE-A-26 24 442, DE-A-37 39 -332, US-A4, 719, 132, EP-A-89 497, US-A-4, 558, 090, US-A-4, 489, 135, EP-A 38 127, DE-A-36 28 124, EP-A-158 099, DE-A-29 26 584, EA-195 931 and DE-A-33 21 180). Also suitable as binders (Bl) for component B are water-dispersible and water-dispersible polyurethane resins which can not be prepared in the form of organic solutions. Said resins are, in particular, polyurethane resins in which the prepolymer containing the isocyanate group has been reacted with a polyamine as a modifying agent. The preparation of these resins is described, for example, in DE-A-42 32 721. Also water-dispersible or water-dispersible binders (Bl) for component B) are suitable water-soluble emulsion polymers described in DE-A-38 41 540. For further details, see DE-A-38 41 540. Aqueous component B) can, moreover, optionally include one or more organic solvents in smaller amounts and, in addition, if is desired, auxiliaries and common additives. Examples of suitable organic solvents are the solvents already listed in the description of component A) The content of the organic solvent is generally 0 to 3% by weight, based on the total weight of component B). Likewise, the additives mentioned in the description of component A) are suitable examples of auxiliaries and additives. The amount of these additives for use is, generally, from 0 to 10% by weight, based on the general weight of component B). Component constituents C) Component C) contains at least one degrading agent (Cl) based on di- or polyisocyanates or comprising mixtures thereof. In this context, it is possible, in principle, to also use the compounds already mentioned in the case of the description of the component (Aiib), as degrading agents (Cl). As a degrading agent (Cl) it is possible to use aliphatic, cycloaliphatic or aromatic polyisocyanates, or all of them. Examples of aromatic polyisocyanates are phenylene disocyanate, the biphenylene disocyanate, the naphthylene disocyanate and the diphenylmethane disocyanate. Given its good resistance to ultraviolet light, the (cyclo) aliphatic polyisocyanates give rise to products with a low tendency to yellow. Examples of cycloaliphatic polyisocyanates are isophorone disocyanate, cyclopentylene disocyanate and products of the hydrogenation of aromatic disocyanates, for example cyclohexylene disocyanate, methylcyclohexylene disocyanate and dicyclohexylmethane disocyanate. Aliphatic disocyanates are compounds of formula OCN- (CR32) r-NCO wherein r is an integer from 2 to 20, in particular from 6 to 8, and R3, which may be identical or different, is hydrogen or an alkyl radical smaller with 1 to 8 carbon atoms, preferably 1 or 2 carbon atoms. Examples of this are trimethylene disocyanate, tetramethylene disocyanate, penta ethylene disocyanate, hexamethylene disocyanate, propylene disocyanate, ethylethylene disocyanate, methyltrimethylene disocyanate and trimethylhexane disocyanate. Another example of a preferred aromatic dissociant (Cl) is tetramethylxylene disocyanate. In addition to the dissociates the degrading agent (Cl) may include a proportion of polyisocyanates with functionalities of more than two, for example, trisocyanates. The trisocyanates which have proved to be suitable are the products obtained by trimerization or oligomerization of disocyanate or by reaction of disocyanate with functional p or 1 i compounds containing OH or NH groups. These include, for example, the biuret of hexamethylene disocyanate and water, the isocyanurate of hexamethylene disocyanate, or the adduct of isophorone disocyanate with trimethylpropane. The average functionality can be decreased if desired by adding monoisocyanates. Examples of the chain termination monoisocyanates are phenyl isocyanate, cyclohexyl isocyanate and stearyl isocyanate. The degrading agent (Cl) can be used on its own as a component of mixture C), and preferably in solution or dispersion in a liquid solvent (C2). Suitable solvents (C2) are preferably organic solvents that show no reaction to the degradant agent. Examples which may be mentioned of suitable organic solvents (C2) are esters, ketones, ketoesters, glycol ether esters and the like. If water or water-soluble solvents (C2) are to be used, pre-mixing with the degrading agent (Cl) is preferred, in order, on the one hand, to establish the viscosity in a desired manner and, on the other hand, to avoid a reaction of the degrading agent with, for example, the hydroxyl groups of the binders. Constituents of component D) Component D) consists essentially of an aqueous solution or dispersion of a rheological aid (D1). The rheological auxiliary (Dl) influences the application properties of the novelly important coating compositions in a very fundamental way. For example, in the case of aqueous coating compositions containing metallic pigments, the orientation of the metallic pigment particles and, therefore, the metallic effect that can be achieved, depends very essentially on the rheological properties of the aqueous coating composition. . The preferred rheological aids (DI) employed are the phyllosilicates, which swell in water and form gels which, under shear stress, show a high flow limit and a low plastic viscosity. Particular preference is given to the use of phyllosilicate dispersions in accordance with DE-A-37 07 388, which can be obtained from phyllosilicates, a protective colloid and an aqueous dispersing agent, the protective colloid being a polypropylene oxide, which does not contain hydrophobic end groups and has, on average, at least one hydroxyl group per molecule. Novel process for the preparation of aqueous coating compositions BM and its application The novel process for the preparation of aqueous coating compositions for painting interiors of vehicles comprises the following steps: In one embodiment of the invention: I. prepare a pre-mix VM, preferably from 5 to 85% by weight, in particular, preferably from 10 to 75% by weight, of the pigment-containing component A) described above, preferably from 10 to 90% by weight, in particular, preferably from 15 to 85 % by weight, of the binder-containing component B) described above, and preferably from 5 to 50% by weight, in particular, preferably from 10 to 40% by weight, of component C) described above, containing the degrading agent, constituting the sum of the components A), B) and C) the 100 by weight of the VM premix and then II. preferably from 10 to 95% by weight, in particular, preferably from 20 to 90% by weight, of the premix VM is mixed with, preferably, from 5 to 90% by weight, in particular, preferably, with 10 to 80% by weight, of the rheology controller component D) described above, to form the aqueous coating composition BM, constituting the sum of the premix VM and the component D) 100% by weight of the waterborne coating composition BM, and, finally , the processing of the viscosity of the aqueous coating composition is established, preferably between 15 and 40 seconds (DIN4 cup), adding deionized water as component E). In a further embodiment of the invention, of the same state, I. a premix VM is prepared, preferably from 5 to 85% by weight, particularly preferably from 10 to 75% by weight, of the pigment-containing component A) described above, preferably from 10 to 90% by weight, in particular, preferably from 15 to 85% by weight, of the binder-containing component B) described above, and preferably from 5 to 50% by weight, in particular, preferably , from 10 to 40% by weight, of the component C) described above, containing the degrading agent, constituting the sum of the components A), B) and C) the 100 by weight of the premix VM and then II. preferably from 10 to 95% by weight, in particular, preferably from 50 to 95% by weight, of the premix VM is mixed with, preferably, from 60 to 90% by weight, in particular, preferably, with 5 to 50% by weight, in particular, preferably, with 10 to 40% by weight of the component C) described above containing the degrading agent to form the aqueous coating composition BM, constituting the sum of the premix VM and of component C) 100% by weight of the aqueous coating composition BM, and, finally, the processing of the viscosity of the aqueous coating composition is established, preferably between 15 and 40 seconds (DIN4 cup), adding deionized water as component E). The premix VM and the novel waterborne coating composition BM are prepared by methods known to those skilled in the art, mixing and, if desired, dispersing the individual components. The aqueous coating composition BM prepared using the novel mixing system is preferably applied in the interiors of the vehicles to substrates prepared according to the prior art, for example, in the self-finishing of the production line and, in particular, in the new automotive finish. A particular advantage is that coatings with novel paints in vehicle interiors do not require additional coating with a transparent topcoat.

The aqueous coating compositions BM are applied directly after their preparation by the novel process to the damaged site prepared suitably (for example by filling and straighteners) by customary methods, in particular, by spray painting.

The film prepared in this way is cured at room temperature or by forced drying (for example, 10 minutes at 60 degrees C, 80 degrees C or by IR drying). The thickness of the dry film of the matte paint film is between 5 and 100, preferably between 10 and 70 microns.

In the text that follows, the invention is illustrated in more detail with reference to working examples. All parts and percentages are by weight unless otherwise specified. EXAMPLES Example 1: Preparation of basic paints (A ') and (A1') for component A) Preparation of a polyurethane resin (Al) as a binder for the basic paints (A ') and (A' *): 683.6 g of polyester with an average molecular weight Mn of 1400 daltons, based on a commercial unsaturated dimer fatty acid (with an iodine number of 10 mg I2 / g, a monomer content of not more than 0.1%, a trimer content of no more than 2%, an acid number of 195 to 200 mg of KOH / g and a hydrolysis number of 197 to 202 mg of KOH / g), isophthalic acid and hexanediol are charged, under a protective gas, in a suitable reaction vessel with stirrer, coolant of flow and feed container and, in order, 10.8 g of hexanediol, 55.9 g of dimethylolpropionic acid, 344.9 g of methyl ethyl ketone and 303.6 g of 4,4 '-di (isocyanatocyclohexyl) -methane. This mixture is kept under reflux until the isocyanate content has decreased to 1.0%. Then 26.7 g of trimethylolpropane are added to the mixture and this mixture is kept under reflux until the viscosity is 12 dPas (in a resin solution: N-methylpyrrolidone = 1: 1). Then 1378.7 g of butylcligol are added. After the vacuum distillation in which the methyl ethyl ketone is removed, the resin solution is neutralized with 32.7 g of dimethylethanolamine. The solids content of the solution resulting from the polyurethane resin (Al) is 44% by weight. The composition obtained is diluted with butyl glycol, with vigorous stirring, to a solids content of 41% by weight. Preparation of the basic paint (A *): 20 parts by weight of a chrome-plated aluminum bronze are dispersed homogeneously according to DE-A-36 36 183 (65% aluminum content, average particle diameter: 15 microns) in 9 parts by weight of butyl glycol and 7 parts by weight of isobutanol by stirring for 15 minutes, and this dispersion is then mixed by stirring in 64 parts by weight of the solution of the polyurethane resin (Al). This mixture is stirred for a further 30 minutes using a high speed stirrer at 1000 rpm. Preparation of the basic paint (A "') s 8 parts by weight of paliogenic blue, 75.3 parts by weight of the solution of the polyurethane resin (Al), 10.5 parts by weight of butyl glycol and 8 parts by weight are mixed by stirring. of isobutanol and dispersed using a sand mill Example 2: Preparation of component B) Preparation of binder (Bl) for component B): 683.6 g of polyester with an average molecular weight Mn of 1400 daltons, based on a fatty acid commercial unsaturated dimer (with an iodine number of 10 mg of J.2 / ^ 1 a monomer content of not more than 0.1%, a trimer content of not more than 2%, an acid number of 195 to 200 mg of KOH / g and a hydrolysis number of 197 to 202 mg of KOH / g), isophthalic acid and hexanediol are charged under a protective gas in a suitable reaction vessel with stirrer, flow coolant and feed container and, in order, 10.8 g of hexanediol, 55.9 g of dimethylolpropionic acid, 3 44.9 g of methyl ethyl ketone and 303.6 g of 4,4 '-di (isocyanatocyclohexyl) -methane. This mixture is kept under reflux until the isocyanate content has decreased to 1.0%. Then 26.7 g of trimethylolpropane are added to the mixture and this mixture is kept under reflux until the viscosity is 12 dPas (in a resin solution: N-methylpyrrolidone = 1: 1). By the addition of 47.7 g of butyl glycol, any excess isocyanate is destroyed. Then 32.7 g of dimethylethanolamine, 2688.3 [lagoon] of deionized water and 193.0 g of butyl glycol are added to the reaction mixture with vigorous stirring. After removing the methyl ethyl ketone by vacuum distillation, the dispersion of the polyurethane resin (Bl) with a solids content of about 27% is obtained. Preparation of component B): 52 parts by weight of deionized water, 0.5 parts by weight of a commercial defoamer and 3.5 parts by weight of a solution of 3.5% strength of a commercial polyacrylate thickener in water to 44 parts are added by agitation. by weight of the dispersion of the polyurethane resin (Bl). Example 3: Preparation of the aqueous coating composition BM by the process according to claim 1: Stage I: 121.9 parts by volume of the basic paint (A1) of Example 1 and 49.6 parts by volume of the basic paint are mixed ( A1 •) of Example 1 as component A), with vigorous stirring, with 351.1 parts by volume of component B) of Example 2 and 200 parts by volume of an isocyanate curing agent (Glassodur® hardener "sehr kurz" [very short ] of BASF Lacke + Farben based on 1,6-hexamethylene disocyanate as component C). This produces the VM1 premix. Step II: The premix VM1 is mixed, with vigorous stirring, with 463.4 parts by volume of rheological auxiliary (adjustment additive 93-E3 of Glasurit, based on thickener of sodium-magnesium phyllosilicate) as component D). This produces the intermediate mix VM1. Finally, the intermediate mixture ZM1 is mixed with vigorous stirring with 200 parts by volume of deionized water as component E). This produces the aqueous coating composition BM1. Example 4: Preparation of the aqueous coating composition BM2 by the process according to claim 2: Stage I: 121.9 parts by volume of the basic paint (A1) of Example 1 and 49.6 parts by volume of the basic paint are mixed ( A * ') of Example 1 as component A), with vigorous stirring, with 351.1 parts by volume of component B) of Example 2 and 463.4 parts by volume of rheological auxiliary (adjustment additive 93-E3 of Glasurit) as component D) . This produces the VM2 premix. Stage II: Premix VM2 is mixed, with vigorous stirring, with 200 parts by volume of an isocyanate curing agent (Glassodur® hardener "sehr kurz" [very short] from BASF Lacke + Farben based on 1,6-hexamethylene disocyanate) as component C). This produces the pre-mix ZM2. Finally, the intermediate mixture ZM2, with vigorous stirring, is mixed with 200 parts by volume of deionized water as component E). This produces the aqueous coating composition BM2. Example 5: Application of the aqueous coating compositions BM1 and BM2 and properties of the resulting finishes Directly after the preparation of the aqueous coating compositions BM1 and BM2, they are sprayed (2 coats of spray with HLVP or normal spray gun) through of known methods in the phosphatized steel panels (bonder 132) coated with a commercial electrodeposition coating and a conventional water-loaded planer (ie, charged with solvent), and dried, after a 30 minute evaporation period, for an additional 30 minutes at 60 degrees C. The dry film thickness of the aqueous coating compositions BM1 and BM2 is about 20 to 25 microns. The resulting paint films are matte and have great resistance to scratches. In the context of the painting of vehicle interiors, the nuance of the paint film can be precisely matched, by the choice and identical combination of the basic paints, to the nuance of the exterior finish of the vehicle, for which it is necessary to apply a coating of 2-component clearcoat as upper coating (compare for example DE-A-41 10 520).

Claims (14)

1. Claims: 1. Multistage process for the preparation of aqueous coating compositions BM for painting interiors of vehicles, characterized by: I. A premix VM is prepared from: a component A) containing at least one basic paint (A) comprising less than 5% by weight of water, at least one color pigment or special effect, or both, organic solvent, at least one binder resin soluble in water or dispersible in water, containing hydroxyl and, optionally, auxiliaries and additives, an aqueous pigment-free component B) comprising at least one binder containing hydroxyl (Bl), and a component C) consisting of a solution or dispersion of a di- or polyisocyanate, or both, (Cl) or a mixture of di- or polyisocyanates, or both, (Cl), and in which subsequently: II. the aqueous coating composition BM is prepared by mixing an aqueous solution or dispersion of a rheological auxiliary (D1) as component D) in the premix of VM and, finally, the viscosity processing of the coating composition BM is established by the addition of deionized water as component E).
2. 2. Multistage process for the preparation of aqueous coating compositions BM for painting interiors of vehicles, characterized by: I. a premix VM is prepared from: a component A) containing at least one basic paint (A) comprising less than 5% by weight of water, at least one color or special effect pigment, or both , organic solvent, at least one water-soluble or water-dispersible binder resin, containing hydroxyl and, optionally, auxiliaries and additives, an aqueous pigment-free component B) comprising at least one binder containing hydroxyl (Bl) , and an aqueous solution or an aqueous dispersion of a rheological auxiliary (D1) as component D), and in which subsequently: II. the aqueous coating composition BM is prepared by mixing in the premix of VM a solution or dispersion of di- or polyisocyanate, or both, (Cl) or a mixture of di- or polyisocyanates, or both, (Cl), as component C ) and, finally, the viscosity processing of the coating composition BM is established by the addition of deionized water as component E).
3. 3. The multi-stage process according to claim 1 or 2, characterized in that the water-soluble or water-dispersible, hydroxyl-containing binder resin of component A) comprises at least one polyacrylate resin which is water-soluble or dispersible in water. water, which contains hydroxyl (A2) with a number between 5 and 40 mg KOH / g or at least one polyurethane resin optionally acrylicized water-soluble or dispersible in water, containing hydroxyl (Al) with a hydroxyl number of 20 and 100 mg KOH / g.
4. 4. The multi-stage process according to one of claims 1 to 3, characterized in that the basic paints (A) present in component A) are free of water.
5. The multi-stage process according to one of claims 1 to 4, characterized in that the basic paint (A) contains Aa) from 0.5 to 70% by weight of at least one special effect pigment or at least one color pigment, Ab) from 10 to 80% by weight of at least one water-soluble or water-dispersible binder, containing hydroxyl and, Ac) Ac) at least one organic solvent, and optionally Ad) auxiliaries and additives, constituting in all cases the sum of the proportions by weight of components Aa) to Ad) 100% by weight of component A).
6. The multi-stage process according to one of claims 1 to 5, characterized in that component A) comprises basic paints (A ') containing only special effect pigments and the basic paints (A1 1) contain only colored pigments .
7. 7. The multi-stage process according to one of claims 1 to 6, characterized in that the binder (Bl) of the pigment-free aqueous component B) contains at least one polyactylate resin (A2) acing to claim 3 or at least one optionally acrylated polyurethane resin (Al), or both, acing to claim 3.
8. 8. The multi-step process acing to one of claims 1 to 7, characterized in that the di- or polyisocyanates, or both) (Cl) are isomers or mixtures of isomers of di- or polyisocyanates, or both, aliphatic, cycloaliphatic or aromatic, or all of them.
9. The multi-stage process acing to one of claims 1 or 3 to 8, characterized in that, as in component D), rheological auxiliaries (Dl) are employed as fillers 10.
10. The multi-stage process acing to one of the claims 1 to 9, characterized in that I. a premix VM is prepared of: 5 to 85% by weight, preferably, 10 to 75% by weight, of the pigment-containing component A) 10 to 90% by weight, preferably 15 85% by weight of the aqueous component containing binder B) and 5 to 50% by weight, preferably 10 to 40% by weight, of component C) containing the degradation agent, constituting the sum of the components A) , B) and C) 100 by weight of the VM premix and then: II. the aqueous coating composition is prepared from: 10 to 95% by weight, preferably from 20 to 90% by weight, of the premix VM and from 5 to 90% by weight, preferably 10 to 80% by weight, of the rheology controller component D), and finally the viscosity processing is established by adding deionized water as component E) to the coating composition BM.
11. The multistage process acing to one of claims 2 to 9, characterized in that I. a premix VM is prepared of: 5 to 85% by weight, preferably, 10 to 75% by weight, of the component that contains pigment A) from 10 to 90% by weight, preferably from 15 to 85% by weight, of the aqueous component containing binder B) and from 5 to 85% by weight, preferably from 10 to 75% by weight, of component D ) that controls the rheology, constituting the sum of the components A), B) and D) the 100 by weight of the previous mixture VM and then: II. the aqueous coating composition is prepared from: 50 to 95% by weight, preferably 60 to 90% by weight, of the premix VM and from 5 to 50% by weight, preferably 10 to 40% by weight, of the component C) containing the degrading agent, and finally the viscosity processing is established by adding deionized water as component E) to the coating composition BM.
12. 12. The aqueous coating compositions BM prepared through the multi-step process acing to one of claims 1 to 11.
13. 13. The use of the aqueous coating compositions BM acing to claim 12 as a water-based paint for the coating of the interiors or plastic components of vehicles, or both.
14. 14. The use of the water-based coating compositions BM acing to claim 12 as a new automotive finish coating the coating of the interiors or plastic components of vehicles, or both. act: The invention relates to a multi-stage process for the preparation of aqueous coating compositions BM for the painting of vehicle interiors, in which process I. a pre-mix VM is prepared from the components: A), which contains at least one basic paint (A) comprising less than 5% by weight of water, at least one color pigment or special effect, or both, organic solvent, at least one dissolvable binder resin in water or dispersible in water, containing hydroxyl and, optionally, auxiliaries and additives, a pigment-free aqueous component B) comprising at least one binder containing hydroxyl (Bl), and C) or dispersion of a di- or polyisocyanate, or both (Cl) or a mixture of di- or polyisocyanates, or both (Cl); or, alternatively to C), D) a solution or an aqueous dispersion of a rheological auxiliary (D1) and subsequently II. In order to prepare the aqueous coating composition BM, a solution or an aqueous dispersion of a rheological auxiliary (D1) or, alternatively, as component C) a solution or dispersion of di-o is added to the premix of VM. polyisocyanate, or both, (Cl) or a mixture of di- or polyisocyanates, or both, (Cl), prepared in stage I., provided that the respective component C) or D) is not present in the premix VM , and, finally, viscosity processing is established by adding deionized water as component E).