AQUEOUS COMPOSITION AND AQUEOUS COATING AGENT

Description

[0001] The present invention relates to a kit of parts for producing an aqueous coating agent comprising an aqueous composition and a further agent capable of forming an active ester with carboxyl groups, an aqueous coating agent containing the aqueous composition and the agent capable of forming an active ester with carboxyl groups, and the use of the aqueous coating agent as a paint.

[0002] Especially in the automotive sector, a trend toward so-called soft-feel coatings has been observed for some time. Such soft-feel coatings create a special tactile sensation that can be described as velvety, soft, rubbery, or warm, and is perceived as pleasant. Furthermore, such soft-feel coatings give the surface a matte appearance that is perceived as appealing.

[0003] In the automotive sector, such coatings can be applied using special machines and processes, such as in special coating systems that operate at elevated temperatures and / or reduced pressure. This allows the use of many materials and material combinations that cannot be used in interior and / or exterior paints, for example, because they are difficult to apply or dry slowly.

[0004] Paints, especially matte paints, often suffer from the problem that they cannot be offered to the end user as one-component (1K) systems. Instead, they are usually offered to the user as two-component (2K) systems, which usually consist of a base paint and a hardener, which the user must mix immediately before use. This has several disadvantages. Firstly, dosing errors can easily occur, resulting in the paint not curing completely or excess hardener causing undesirable side reactions. Furthermore, the time window until curing is short, meaning the user must apply the mixed paint quickly. Due to this short time window, the user must also know exactly the amount of paint required in order to keep unusable surpluses as low as possible.Finally, the hardeners are reactive substances that are often harmful to health, so users of 2K paint systems have to deal with these harmful substances.

[0005] One-component coating systems are well known, but curing is often based solely on physical drying. Therefore, no chemical crosslinking occurs during the curing of such coatings. The disadvantage is their lower mechanical and / or chemical resistance.

[0006] One-component coating systems, in which chemical crosslinking occurs during curing, are also known. The base coating is usually mixed with a hardener that has been previously reacted with a blocking agent. However, to cure these systems, the hardener must first be activated by heating, which requires an additional process step, may release undesirable substances, and is not always possible.

[0007] EP 0 669 352 A1 describes an aqueous dispersion of polyester polyurethanes, which is essentially composed of difunctional starting materials.

[0008] EP 3 098 267 A1 describes a curable composition comprising an organic polymer containing a reactive silicon group and a bound substance of kaolinite and quartz.

[0009] WO 2012 / 0 52406 A1 describes aqueous compositions with soft-feel properties, comprising an aqueous polyurethane-polyurea dispersion, a hydroxy-functional polyacrylate copolymer and a polyisocyanate.

[0010] EP 3 135 701 A1 describes an aqueous composition essentially comprising one or more multi-stage acrylic emulsion polymers.

[0011] WO 2006 / 072080 A1 describes rigid substrates provided with a coating that gives the substrates a "soft feel".

[0012] US 2012 / 142815 A1 describes a radically polymerizable coating composition suitable for forming protective coatings on substrates.

[0013] EP 0 978 549 A1 describes binder-hardener combinations for soft-feel coatings which comprise a water-dilutable binder.

[0014] WO 03 / 095517 A1 describes aqueous polyurethane preparations.

[0015] WO 2013 / 040765 A1 describes a process for producing artificial leather comprising a cover layer, a polyurethane layer and optionally a substrate layer.

[0016] JP 2017 071684 A describes an aqueous polyurethane dispersion and a soft-feel composition containing the aqueous polyurethane dispersion.

[0017] WO 2016 / 144753 A1 describes a water-based primer composition comprising an aqueous polyurethane dispersion and an organic solvent.

[0018] The object of the invention is to provide a kit of parts comprising an aqueous composition. A further object of the invention is to provide a kit of parts that has a long shelf life and / or from whose components an aqueous coating composition can be easily obtained.

[0019] Another object of the invention is to provide an aqueous coating composition which can be used as a paint, in particular indoors and / or outdoors.

[0020] A further object of the invention is to provide an aqueous coating composition that users can use as a one-component paint system. It is particularly desirable if no additional step, in particular no activation step by the user such as a heating step, is required prior to application of the paint.

[0021] A further object of the invention is to provide an aqueous coating composition which users can apply as a paint as a 1K system which has a long time window for application and / or in which the user does not have to handle any substances which are harmful to health.

[0022] A further object of the invention is to provide an aqueous coating composition, in particular as a varnish, which exhibits a soft-feel effect, in particular with regard to the feel and / or the visual impression, and / or has good mechanical and / or chemical resistance and / or exhibits good adhesion to surfaces to which varnishes are usually applied.

[0023] All or some of these objects are achieved by the kit of parts specified in claims 1 and 8, the aqueous coating composition specified in claim 12 and the use specified in claim 15.

[0024] Advantageous embodiments are specified in the dependent claims and are explained in detail below.

[0025] The invention accordingly provides an aqueous coating composition that can be used as a paint, in particular as a 1K system. The aqueous coating composition according to the invention can, in particular, have a long application window. Nevertheless, a long shelf life is desirable for such coating compositions. For this purpose, the invention provides a kit of parts comprising an aqueous composition and a hardener. These two components can be stored in separate containers. This can result in a long shelf life. On the other hand, the aqueous coating composition according to the invention can be easily obtained by mixing the aqueous composition with the hardener. Accordingly, the invention further provides an aqueous composition that is a component of the kit of parts according to the invention.Since the hardener of the kit-of-parts is required only in small amounts in the aqueous coating composition according to the invention, the amounts of the remaining components of the aqueous composition and the aqueous coating composition according to the invention can at least partially overlap. The following section first describes in more detail the aqueous composition contained in the kit-of-parts according to the invention, followed by the process for producing the aqueous composition contained in the kit-of-parts according to the invention, the kit-of-parts according to the invention, and the aqueous coating composition according to the invention.

[0026] The kit of parts according to the invention contains, based on the total weight of the coating agent, a. 3 to 25 wt.% binder, b. 5 to 25 wt.% crosslinking polymer, c. 0.5 to 10 wt.% particles with an average particle size of 1 to 20 µm, d. 0.01 to 2 wt.% of an alkaline component, e. 0.5 to 50 wt.% hardener, f. 30 to 70 wt.% water, wherein the aqueous coating agent has a pH of 8 to 10.5, and wherein the kit of parts comprises: A) an aqueous composition containing, based on the total weight of the composition, i. 3 to 25 wt.% binder, ii. 5 to 25 wt.% crosslinking polymer, iii. 0.5 to 10 wt.% particles with an average particle size of 1 to 20 µm, iv. 0.01 to 2 wt.% of an alkaline component, v. 30 to 70 wt.% water B) a hardener, characterized in that the hardener is carbodiimide and that the binder is present as a mixture of two aqueous binder dispersions each with a solids content of 25 to 60 wt.%, wherein the binder is in the form of an aqueous polyurethane dispersion and an aqueous anionic polyester polyurethane dispersion.

[0027] Surprisingly, it has been found that the combination of 3 to 25 wt.% of a binder with 5 to 25 wt.% of a crosslinking polymer, 0.5 to 10 wt.% of particles with an average particle size of 1 to 20 µm, and 0.01 to 2 wt.% of an alkaline component in 30 to 70 wt.% water results in an aqueous composition that is well suited for a kit-of-parts with a hardener as an additional component. By adding the hardener to the aqueous composition, an aqueous coating agent can be obtained that exhibits a pleasant soft-feel effect in terms of grip and / or can be used as a paint indoors and / or outdoors and / or exhibits good adhesion to various surfaces and / or has a long application time window and / or exhibits good resistance to mechanical and / or chemical influences and / or in which the user does not have to handle any substances that are harmful to health.Despite the long time window for application, it was still possible to obtain aqueous coating materials, especially varnishes, that cured quickly after application to a surface.

[0028] Without wishing to be bound by any scientific theory, the addition of the alkali adjuster to the aqueous composition contained in the kit-of-parts according to the invention appears to ensure that, after mixing the aqueous composition with the hardener, the hardener is stabilized in the aqueous coating composition according to the invention. Nevertheless, the evaporation of at least some of the components from the aqueous coating composition according to the invention after application appears to ensure that the aqueous coating composition cures well. Furthermore, the hardener appears to initiate chemical crosslinking reactions during curing, which lead to good mechanical and / or chemical resistance of the coating. Finally, to produce the aqueous coating composition, it may be sufficient to mix the two components of the kit-of-parts without the need to add further components.

[0029] The mean particle size, in particular of particles with a particle size of 1 to 20 µm, can in particular refer to the D 50 value. The D 50 value can in particular refer to the size at which 50%, e.g. 50% by weight, are smaller than the stated size. For example, 50%, e.g. 50% by weight, of the particles would then pass a theoretical sieve size. Methods for determining the mean particle size, in particular the D 50 value, are known to the person skilled in the art. The mean particle size, in particular the D 50 value, can be determined, for example, by creating a particle size distribution. The measurement can be carried out, for example, by means of light scattering, in particular by means of laser diffractometry or photon correlation spectroscopy. In particular, the mean particle size, in particular the D 50 value, can be measured in a liquid medium, for example an aqueous medium.The measurement can be carried out in particular in accordance with ISO 13321, in particular ISO 13321:1996, and / or ISO 22412, in particular ISO 22412:2008. For example, a Malvern Mastersizer 2000 or 3000 can be used to determine the mean particle size, in particular the D 50 value. Other options for determining the mean particle size, in particular the D 50 value, are light and / or laser diffraction. A Malvern Mastersizer 3000 is preferably used to determine the particle size distribution. This can advantageously be done in accordance with ISO 13320, in particular ISO 13320:2009. Furthermore, the mean particle size, in particular the D 50 value, can be determined using an ultracentrifuge or chromatographic methods, for example capillary hydrodynamic fractionation (CHDF).

[0030] The aqueous composition contained in the kit-of-parts according to the invention contains 3 to 25 wt.%, preferably 5 to 20 wt.%, more preferably 8 to 15 wt.%, particularly preferably 10 to 13 wt.%, of binder, in each case based on the total weight of the composition.

[0031] The information regarding the binder content in the aqueous composition relates in each case to the binder as a solids fraction. According to the invention, however, the binder is added in the form of an aqueous dispersion during the preparation of an aqueous composition. The aqueous binder dispersions contain 25 to 60 wt. %, preferably 30 to 50 wt. %, more preferably 35 to 40 wt. % binder as solids content. Accordingly, the binder of the aqueous composition is present in the form of an aqueous dispersion with a solids content of 25 to 60 wt. %, in particular 30 to 50 wt. % or 35 to 40 wt. %. The water in the binder dispersion is calculated as part of the total water content of the aqueous composition. If the binder is present, for example, as a 50% dispersion in water, the aqueous composition correspondingly contains 6 to 50 wt.-% of the binder dispersion and correspondingly less water, in particular 27 to 45 wt.% water, each based on the total weight of the aqueous composition. Aqueous compositions containing binders in these amounts have demonstrated good processing properties, in particular good miscibility.

[0032] The binder in the aqueous composition of the kit-of-part according to the invention is present as a mixture of two aqueous binder dispersions, each with a solids content of 25 to 60 wt. %, in particular 30 to 50 wt. % or 35 to 40 wt. %. The aqueous binder dispersions can have the same or different, preferably different, solids contents. Preferably, one of the binder dispersions has a solids content of 35 wt. % and the other a solids content of 40 wt. %. More preferably, the two binder dispersions are used in a weight ratio (binder dispersion with a solids content of 35 wt. %) to (binder dispersion with a solids content of 40 wt. %) of 1.3 to 1.9, in particular 1.4 to 1.8 or 1.5 to 1.7.

[0033] According to the invention, an aqueous polyurethane dispersion, in particular with a solids content of 35 wt. %, and an aqueous anionic polyester polyurethane dispersion, in particular with a solids content of 40 wt. %, are used as binders. It has been found that aqueous coating compositions containing such binders can exhibit good adhesion to various surfaces, in particular to metal, wood, plastics, as well as to existing coatings and suitable primers. Furthermore, coatings containing such binders exhibit a pleasant feel.

[0034] The aqueous composition further contains 5 to 25 wt. %, preferably 8 to 22 wt. %, more preferably 10 to 20 wt. %, particularly preferably 13 to 17 wt. %, of crosslinking polymer, based in each case on the total weight of the composition. Such amounts of crosslinking polymer have proven advantageous for good crosslinking of the aqueous coating composition and thus for good durability of the dried coating.

[0035] The crosslinking polymer, in particular, has the function of providing at least one functional group with which the hardener of the aqueous coating composition, which is preferably stored separately in the kit of parts, enters into a chemical reaction, thus causing chemical crosslinking. Preferably, the at least one functional group of the crosslinking polymer is selected such that no chemical crosslinking occurs in the aqueous composition that does not contain the hardener of the aqueous coating composition.

[0036] The crosslinking polymer advantageously has at least one carboxyl group and / or at least one hydroxyl group and / or at least one amino group, preferably at least one carboxyl group. Furthermore, the crosslinking polymer advantageously has an acid number of 1 to 20 mg KOH / g. The acid number can be calculated, in particular, based on the delivery form of the crosslinking polymer. The acid number can be determined, in particular, according to DIN EN ISO 2114, in particular according to DIN EN ISO 2114:2002-06.More preferably, the crosslinking polymer is selected from the group consisting of anionic polyurethanes, aliphatic anionic polyurethanes, acrylic acid-containing polymers, polyurethane-acrylate emulsions, polyurethane-alkyd emulsions, polyurethanes, polyester-polyurethanes, anionic polyester-polyurethanes, aliphatic anionic polyester-polyurethanes, polycarbonate ester polyurethanes, polyether polyols, polyacrylate dispersions, alkyd emulsions, and their hydroxy-functional polymers and mixtures thereof. The crosslinking polymer is particularly preferably an aliphatic anionic polyurethane.

[0037] The information regarding the crosslinking polymer content in the aqueous composition refers in each case to the crosslinking polymer as a solids fraction. However, the crosslinking polymer is preferably added in the form of a dispersion, in particular an aqueous dispersion. These crosslinking polymer dispersions, in particular the aqueous crosslinking polymer dispersions, advantageously contain 25 to 60 wt. %, preferably 30 to 50 wt. %, more preferably 35 to 45 wt. % or 40 wt. % of crosslinking polymer as a solids content. Accordingly, the crosslinking polymer of the aqueous composition according to the invention can be present in the form of an aqueous dispersion with a solids content of 25 to 60 wt. %, in particular 30 to 50 wt. % or 35 to 45 wt. % or 40 wt. %.If the crosslinking polymer is added as an aqueous crosslinking polymer dispersion, the water in the crosslinking polymer dispersion is counted as part of the total water content of the aqueous composition. For example, if the crosslinking polymer is present as a 50% dispersion in water, the aqueous composition contains 10 to 50% by weight of the binder dispersion and correspondingly less water, in particular 25 to 45% by weight of water, each based on the total weight of the aqueous composition. Aqueous compositions containing crosslinking polymer in these amounts have demonstrated good processing properties, particularly good miscibility.

[0038] The aqueous composition further contains 0.5 to 10 wt.%, preferably 1 to 8 wt.%, more preferably 2 to 7 wt.% or 3 to 6 wt.%, of particles having an average particle size of 1 to 20 µm, in each case based on the total weight of the composition.

[0039] The particles with an average particle size of 1 to 20 µm preferably have an average particle size of 2 to 17 µm, more preferably of 3 to 15 µm, particularly preferably of 4 to 13 µm or of 6 to 10 µm. The above statements apply to the average particle size and its determination. Advantageously, the particles with the above-listed sizes are selected from the group consisting of polyurethane particles, polymethyl methacrylate particles, polymethyl urea particles, silicate-acrylic resin polymer particles, polymeric hollow microspheres, cellulose fibers, textile fibers, cork flour, and mixtures thereof. Particular preference is given to silicate-acrylic resin polymer particles. Such particles can be easily integrated into the aqueous composition and the aqueous coating agent and exhibit little demixing effects even in the dry film.

[0040] The aqueous composition further contains 0.01 to 2 wt.%, preferably 0.01 to 1 wt.%, more preferably 0.01 to 0.05 wt.%, of an alkaline component, in each case based on the total weight of the composition. The alkaline component is expediently selected from the group consisting of potassium hydroxide, sodium hydroxide, calcium hydroxide, ammonia, triethylamine, dimethylaminoethanol, aminomethylpropanol, dimethylglucamine and mixtures thereof. The alkaline component in its pure state is preferably a water-soluble gas, in particular ammonia. The alkaline component is preferably in the form of an aqueous solution. More preferably, the alkaline component is in the form of ammonia. If the alkaline component is in the form of an aqueous solution, in particular as ammonia, the aqueous composition preferably contains 0.01 to 2 wt.%, more preferably 0.01 to 1 wt.% of the alkaline component.The above statements regarding binder and crosslinking polymer dispersions apply accordingly to the water content of the aqueous composition. It has been found that the aforementioned alkaline components in the aqueous coating composition can achieve good stabilization of the agent, which is capable of forming an active ester with carboxyl groups. Nevertheless, these alkaline components, especially ammonia, especially in the form of ammonia spirit, can achieve rapid curing after application of the aqueous coating composition.

[0041] The aqueous compositions contained in the kit of parts according to the invention, comprising a combination of the aforementioned components, have advantageous properties. The aqueous compositions are a component of the kit of parts according to the invention, together with a hardener as a further component, with which, by simply mixing the components, aqueous coating compositions according to the invention can be produced. These coatings can be delivered to users as one-component coatings with a curing time in the container of up to two months. Coatings created with such coatings have a pleasant feel. Furthermore, they adhere very well to various substrates and / or are very suitable for use as paints indoors and / or outdoors. Such coatings also exhibit good resistance after curing.These effects were achieved with aqueous compositions in which the binder was in the form of an aqueous polyurethane dispersion and an anionic aliphatic polyester polyurethane dispersion, the crosslinking polymer was in the form of an aqueous aliphatic anionic polyurethane dispersion, the particles had an average particle size of 6 to 10 µm and were in particular silicate acrylic resin polymer particles and the alkaline component in the pure state was a water-soluble gas, in particular the alkaline component was in the form of ammonia.

[0042] The aqueous composition of the kit-of-parts according to the invention can expediently additionally contain 0.1 to 5 wt. %, in particular 0.1 to 3 wt. % or 0.5 to 1.5 wt. % of matting agent, based in each case on the total weight of the composition. The incorporation of a matting agent helps, in particular, to create the desired visual impression in the cured coating. However, the matting agent can also help to create the desired tactile sensation for the cured coating.

[0043] Matting agents are additives for coating materials, especially paints, which influence the surface of the coating in such a way that its gloss level, especially the reflectometer value, decreases.

[0044] A wide variety of substances can be used as matting agents. The matting agent is preferably selected from the group consisting of silica, fumed silica, polymethylurea, ceramic microspheres, diatomaceous earth, quartz flour, talc, and wax additives such as polyethylene waxes. Silica is preferably used as a matting agent. These matting agents have proven suitable for producing the effects described above.

[0045] The particles of the matting agent preferably have an average particle size, in particular a D 50 value, of 1 to 20 µm, preferably of 5 to 15 µm, more preferably of 7 to 13 µm, more preferably of 8 to 12 µm, and particularly preferably of 9 to 11 µm. The above applies to the average particle size, in particular the D 50 value, of the matting agent and its determination.

[0046] Furthermore, the aqueous composition in the kit-of-parts according to the invention can advantageously contain further particles. In particular, the aqueous composition can additionally contain 0.1 to 5 wt. %, preferably 0.1 to 3 wt. %, more preferably 0.5 to 2 wt. %, based in each case on the total weight of the composition, of particles having a size of 1 to 50 µm, preferably 1 to 40 µm, more preferably 1 to 30 µm, more preferably 1 to 20 µm, more preferably 1 to 15 µm, more preferably 1 to 10 µm, particularly preferably 6 µm. The size of these particles is in particular the D 90 value. The D 90 value can in particular designate the size at which 90%, e.g. 90 wt. %, are smaller than the stated size. For example, 90%, e.g. 90 wt. %, of the particles would then pass a theoretical sieve size. What has been said about the D 50 value applies accordingly to the methods known to the person skilled in the art for determining the D 90 value.Advantageously, the additional particles are selected from the group consisting of polyurethane particles, polymethyl methacrylate particles, polymethyl urea particles, silicate acrylic resin polymer particles, polymeric hollow microspheres, cellulose fibers, textile fibers, cork flour, and mixtures thereof. These additional particles are preferably polymethyl methacrylate particles, in particular crosslinked polymethyl methacrylate particles. These can in particular have a refractive index of 1.47 to 1.51, preferably 1.48 to 1.50, more preferably 1.487 to 1.492. The addition of particles with such particle sizes can improve the feel of surfaces treated with the aqueous coating composition of the invention.

[0047] Furthermore, the aqueous composition may additionally contain at least one pigment. In particular, the aqueous coating agent may additionally contain 0.1 to 10 wt. %, preferably 0.1 to 5 wt. %, more preferably 0.5 to 3 wt. %, of at least one pigment, based in each case on the total weight of the composition.

[0048] Various substances can also be used as pigments. For example, only inorganic or only organic pigments, or mixtures of inorganic and organic pigments, can be used.

[0049] Preferably, the pigment is selected from the group consisting of titanium dioxide, iron oxide yellow, arylide (monoazo), bismuth vanadate, perinone, rutile-tin-zinc, quinacridone, diketopyrrolo-pyrrole, iron oxide red, phthalocyanine blue, dioxazine, cobalt blue, ultramarine blue, phthalocyanine green, chromium oxide green, cobalt green, carbon black, iron oxide black, pyrazolo-quinazolone, naphtol-AS monoazo pigment and mixtures thereof.

[0050] Inorganic pigments that can be used include oxides such as titanium dioxide, iron oxides, e.g. PY 42, PR 101, P.Bk. 11, chromium oxide green, e.g. PG 17, mixed phase pigments, e.g. cobalt oxide blue PB 28 and green PG 50, bismuth vanadate PY 184, rutile tin zinc PO 216, silicates, e.g. ultramarine blue PB 29 and carbon, e.g. carbon black P.Bk. 7.

[0051] As organic pigments, for example, azo pigments, e.g. Arylide Yellow (Monoazo) PY 74, polycyclic pigments, e.g. Quinacridone PR 122, Perinone PO 43, Pyrazolo-Quinazolone PO 67, Diketo-Pyrrolo-Pyrrole (DPP) PR 254, Dioxazine PV 23 and metal complex pigments, e.g. Copper Phthalocyanine Blue PB 15:3 and Green PG 7 can be used.

[0052] The names of the inorganic and organic pigments used in the examples correspond to the Generic Names of the Colour Index of the British Society of Dyers and Colourists.

[0053] By using pigments in the aqueous composition, colored aqueous coatings can be produced that cover essentially the entire color spectrum. This makes it particularly suitable for the production of colored paints.

[0054] However, the aqueous compositions can also be pigment-free and thus colorless. Such aqueous compositions can be used to produce colorless aqueous coating materials that are particularly suitable as clearcoats. The aqueous composition contained in the kit of parts according to the invention preferably contains no pigment.

[0055] In addition, the aqueous composition contained in the kit of parts according to the invention may also contain other conventional additives and / or additives. In particular, the aqueous composition may additionally contain one or more further additives selected from the group consisting of defoamers, dispersants, wetting agents, preservatives, stabilizers, surface protectants, hydrophobic agents, substrate wetting agents, solvents, and thickeners.

[0056] The additives and / or supplements may be present in pure form and / or as mixtures, particularly with water.

[0057] Additives and / or additives may be present in a total amount of 0.1 to 30 wt.%, preferably 0.5 to 20 wt.%, more preferably 1 to 10 wt.%, in each case based on the total weight of the aqueous composition.

[0058] Examples of thickeners are alcohol alkoxylates, ethylene oxide-propylene oxide copolymers, maleic anhydride-diisobutylene copolymers, polyacrylic and polymethacrylic acid and their salts, methylcelluloses, carboxymethylcelluloses, hydroxymethylcelluloses, polyurethanes, alkali metal phosphates and salts of modified phosphoric acids, as well as mixtures thereof.

[0059] Examples of defoamers are polyglycols, triglycerides, polysiloxane-polyether copolymers and silicone oils.

[0060] Examples of hydrophobic agents include oligomeric and polymeric siloxanes and silicone resins.

[0061] Examples of preservatives are isothiazolines.

[0062] Examples of wetting agents are polysiloxanes and acrylic copolymers.

[0063] Examples of solvents are mono- or polyhydric alcohols.

[0064] Examples of substrate wetting agents are surfactants.

[0065] The invention further provides a kit of parts for producing an aqueous coating composition containing, in each case based on the total weight of the coating composition, a. 3 to 25 wt.% binder, b. 5 to 25 wt.% crosslinking polymer, c. 0.5 to 10 wt.% particles with an average particle size of 1 to 20 µm, d. 0.01 to 2 wt.% of an alkaline component, e. 0.5 to 5 wt.% hardener, f. 30 to 70 wt.% water, wherein the aqueous coating agent has a pH of 8 to 10.5 and wherein the kit of parts comprises: A) an aqueous composition obtainable by a process comprising the steps a. providing a composition containing, in each case based on the total weight of the composition, i. 3 to 25 wt.% binder, ii. 5 to 25 wt.% crosslinking polymer, iii. 0.5 to 10 wt.% particles with an average particle size of 1 to 20 µm, iv. 0.01 to 2 wt.% of an alkaline component, v. 30 to 70 wt.% water, b. dispersing the components mentioned in a. B) a hardener, characterized in that the hardener is carbodiimide and that the binder is present as a mixture of two aqueous binder dispersions each having a solids content of 25 to 60 wt.%, the binder being in the form of an aqueous polyurethane dispersion and an aqueous anionic polyester polyurethane dispersion.

[0066] The steps listed can be performed in any order, but preferably they are performed in the order given.

[0067] Devices known to those skilled in the art can be used to disperse the components. For example, turbomills, bead mills, or dissolvers, preferably dissolvers, can be used for this purpose.

[0068] What has been said in connection with the aqueous composition of the binder also applies equally to the binder of the process.

[0069] What has been said in connection with the aqueous composition of the crosslinking polymer also applies equally to the crosslinking polymer of the process.

[0070] What has been said in connection with the aqueous composition of the particles with an average particle size of 1 to 20 µm also applies equally to the particles with an average particle size of 1 to 20 µm of the process.

[0071] What has been said in connection with the aqueous composition of the alkaline component also applies equally to the alkaline component of the process.

[0072] In particular, the composition of the process can contain 5 to 20 wt.%, in particular 8 to 15 wt.% or 10 to 13 wt.%, binder and / or 8 to 22 wt.%, in particular 10 to 20 wt.% or 13 to 17 wt.%, crosslinking polymer and / or 1 to 8 wt.%, in particular 2 to 7 wt.% or 3 to 6 wt.%, particles with an average particle size of 1 to 20 µm and / or 0.01 to 1 wt.%, in particular 0.01 to 0.05 wt.% of the alkaline component and / or additionally 0.1 to 5 wt.%, in particular 0.1 to 3 wt.% or 0.5 to 1.5 wt.%, matting agent, in each case based on the total weight of the composition.

[0073] Furthermore, the composition of the process can also additionally comprise 0.1 to 5 wt.%, preferably 0.1 to 3 wt.%, more preferably 0.5 to 2 wt.%, in each case based on the total weight of the composition, of particles having a size of 1 to 50 µm, preferably 1 to 10 µm, and / or at least one pigment, in particular 0.1 to 10 wt.%, preferably 0.1 to 5 wt.%, more preferably 0.5 to 3 wt.%, in each case based on the total weight of the composition, at least one pigment and / or 0.1 to 30 wt.%, preferably 0.5 to 20 wt.%, more preferably 1 to 10 wt.%, particularly preferably 1.5 to 5 wt.%, in each case based on the total weight of the composition, of additives and / or defoamers, dispersants, wetting agents, preservatives, stabilizers, surface protectants, hydrophobic agents, substrate wetting agents, solvents and thickeners contain.

[0074] Preferably, the composition of the process does not contain any pigment.

[0075] What has been said in connection with the aqueous composition of the matting agent, the at least one pigment, the particles with a size of 1 to 50 µm and the further additions and / or additives also applies equally to the matting agent, the pigment, the particles and / or the additions and / or additives of the composition of the process.

[0076] The invention further relates to a kit of parts comprising an aqueous composition and a hardener.

[0077] In kits of parts according to the invention, the aqueous composition and the hardener can be stored in separate containers. By separating the containers, a long storage time can be achieved in kits of parts according to the invention. Nevertheless, by simple mixing, in particular using a paint mixer or manual mixing, the kits of parts can be converted into an aqueous coating composition according to the invention, which can be administered directly to users but still has a storage time of up to two months.

[0078] According to the invention, the hardener is a carbodiimide, more preferably a polymeric carbodiimide. Suitable carbodiimides can, in particular, contain functional carbodiimide groups (N=C=N). Carbodiimides can, in particular, be organic compounds with cumulative double bonds of the general structural formula RN=C=NR, where each R radical can be independently selected from the group consisting of H, optionally substituted hydrocarbon radicals having 1 to 20 carbon atoms, optionally substituted C1-C10 alkyl, acyl, aryl, imidoyl, sulfonyl, nitrogen, silicon, and metal-substituted radicals, in particular from the group consisting of H, optionally substituted hydrocarbon radicals having 1 to 20 carbon atoms, optionally substituted C1-C10 alkyl, acyl, aryl, imidoyl, and sulfonyl.Hydrocarbon radicals and alkyl groups can in particular also contain heteroatoms, preferably selected from nitrogen, oxygen, and sulfur, and / or be substituted by C1-C3 alkyl groups, hydroxyl groups, amino groups, and / or dimethylamino groups. Examples of carbodiimides are dicyclohexylcarbodiimide, diisopropylcarbodiimide, and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide.

[0079] Polymeric carbodiimide preferably has at least one, in particular two or more, functional carbodiimide groups (N=C=N). These can be present in the backbone of the polymer or as side chains. Polymeric carbodiimide is also advantageously non-ionic. Polymeric carbodiimide preferably has a carbodiimide equivalent weight of 200 to 800 g / mol, more preferably of 200 to 700 g / mol, further preferably of 200 to 600 g / mol, particularly preferably of 300 to 500 g / mol. Polymeric carbodiimide is preferably present as a dispersion in water or suitable solvent mixtures, in particular with a solids content of 20 to 100 wt.%, preferably 20 to 90 wt.%, more preferably 20 to 80 wt.%, more preferably 20 to 70 wt.%, more preferably 20 to 60 wt.%, more preferably 30 to 50 wt.%, particularly preferably 40 wt.%.

[0080] The carbodiimide group can in particular be the functional group that can enter into a chemical reaction with the crosslinking polymer.

[0081] With the kit of parts according to the invention, aqueous coating compositions according to the invention can be obtained by mixing the components of the kit of parts. The ratio of aqueous composition to hardener is preferably selected such that two moles of carbodiimide groups are present per mole of functional group, in particular per mole of carboxyl group, of the crosslinking polymer.

[0082] Accordingly, the invention provides an aqueous coating composition containing, in each case based on the total weight of the coating composition, a. 3 to 25 wt.% binder, b. 5 to 25 wt.% crosslinking polymer, c. 0.5 to 10 wt.% particles with an average particle size of 1 to 20 µm, d. 0.01 to 2 wt.% of an alkaline component, e. 0.5 to 5 wt.% hardener, f. 30 to 70 wt.% water, wherein the aqueous coating agent has a pH value of 8 to 10.5, characterized in that the hardener is carbodiimide and that the binder is present as a mixture of two aqueous binder dispersions each having a solids content of 25 to 60 wt.%, wherein the binder is in the form of an aqueous polyurethane dispersion and an aqueous anionic polyester polyurethane dispersion.

[0083] The aqueous coating agent preferably has a pH value of 9 to 10. At this pH value, the aqueous coating agent exhibits high storage stability.

[0084] What has been said in connection with the aqueous composition according to the invention regarding the binder also applies equally to the binder of the aqueous coating composition according to the invention.

[0085] What has been said in connection with the aqueous composition of the crosslinking polymer also applies equally to the crosslinking polymer of the aqueous coating composition according to the invention.

[0086] What has been said in connection with the aqueous composition regarding the particles having an average particle size of 1 to 20 µm also applies equally to the particles having an average particle size of 1 to 20 µm of the aqueous coating composition according to the invention.

[0087] What has been said in connection with the aqueous composition regarding the alkaline component also applies equally to the alkaline component of the aqueous coating composition according to the invention.

[0088] In particular, the aqueous coating composition according to the invention can contain 5 to 20 wt.%, in particular 8 to 15 wt.% or 10 to 13 wt.%, of binder and / or 8 to 22 wt.%, in particular 10 to 20 wt.% or 13 to 17 wt.%, of crosslinking polymer and / or 1 to 8 wt.%, in particular 2 to 7 wt.% or 3 to 6 wt.%, of particles with an average particle size of 1 to 20 µm and / or 0.01 to 1 wt.%, in particular 0.01 to 0.05 wt.% of the alkaline component and / or 0.5 to 4 wt.%, in particular 1 to 2 wt.% of hardener and / or additionally 0.1 to 5 wt.%, in particular 0.1 to 3 wt.% or 0.5 to 1.5 wt.%, of matting agent, in each case based on the total weight of the coating composition.

[0089] Furthermore, the aqueous coating composition according to the invention can also additionally comprise 0.1 to 5 wt.%, preferably 0.1 to 3 wt.%, more preferably 0.5 to 2 wt.%, in each case based on the total weight of the coating composition, of particles having a size of 1 to 50 µm, preferably 1 to 10 µm, and / or at least one pigment, in particular 0.1 to 10 wt.%, preferably 0.1 to 5 wt.%, more preferably 0.5 to 3 wt.%, in each case based on the total weight of the coating composition, at least one pigment and / or 0.1 to 30 wt.%, preferably 0.5 to 20 wt.%, more preferably 1 to 10 wt.%, particularly preferably 1.5 to 5 wt.%, in each case based on the total weight of the coating composition, of additives and / or defoamers, dispersants, wetting agents, preservatives, stabilizers, surface protectants, hydrophobic agents, Contains substrate wetting agents, solvents and thickeners.

[0090] The aqueous coating composition according to the invention preferably contains no pigment.

[0091] What has been said in connection with the aqueous composition of the matting agent, the at least one pigment, the particles with a size of 1 to 50 µm and the further additions and / or additives also applies equally to the matting agent, the pigment, the particles and / or the additions and / or additives of the aqueous coating agent.

[0092] What has been said about the hardener in connection with the kit-of-parts also applies equally to the hardener of the aqueous coating composition according to the invention.

[0093] The aqueous coating composition is suitable for various applications. It is particularly suitable as a paint, especially as a one-component paint. Accordingly, the use of the aqueous coating composition according to the invention as a paint, especially for indoor and / or outdoor use, is also subject of the invention.

[0094] The invention is explained in more detail below by means of examples which, however, serve only for illustrative purposes and are not limiting. EXAMPLE

[0095] An aqueous composition A with the following formulation shown in Table 1 was prepared by mixing the ingredients listed in Table 1, doses in wt.% each. Table 1: Recipe of the aqueous composition A ingredient Amount (wt%) Polyurethane dispersion for soft feel effects, as 35% aqueous dispersion 20 Aliphatic anionic polyurethane dispersion, as a 40% aqueous dispersion 37 Anionic aliphatic polyester polyurethane dispersion, as a 40% aqueous dispersion 13 Defoamer, 20% in water 2 wetting agents 1 Matting agents 0,7 Particles with an average particle size of 6 to 10 µm 4 Particles with a particle size D 90 of 6 µm 1 Thickener, 25% in water 3 solvent 7 Dispersants 1,5 Alkaline component, 15% in water 0,2 Water 9,6

[0096] A composition with the recipe given in Table 1 was dispersed using a dissolver, whereby the aqueous composition A was received.

[0097] The aqueous composition A was provided as a kit-of-parts in conjunction with a polymeric carbodiimide, which was present as a 40 wt.% aqueous dispersion, the carbodiimide equivalent weight being 393 g / mol, as a curing agent.

[0098] By manually mixing 19 parts by weight of the aqueous composition AWith 1 part by weight of the polymeric carbodiimide, an aqueous coating composition was obtained that could be supplied to users as a one-component paint system. This paint could be stored in a container for two months without curing. This paint was used indoors and outdoors on metal, wood, plastics, as well as on existing coatings and suitable primers. The paint adhered well to the surfaces, cured within 1 to 4 hours, and exhibited good mechanical and chemical resistance, particularly to water and household chemicals. The coating also had a pleasant feel.

Claims

1. Kit-of-parts for producing an aqueous coating agent containing, in each case based on the total weight of the coating agent, a. 3 to 25 wt.% binder, b. 5 to 25 wt.% cross-linking polymer, c. 0.5 to 10 wt.% particles having an average particle size of 1 to 20 µm, d. 0.01 to 2 wt.% of an alkaline component, e. 0.5 to 5 wt.% hardener, f. 30 to 70 wt.% water, wherein the aqueous coating agent has a pH of 8 to 10.5, and wherein the kit-of-parts comprises: A) an aqueous composition containing, in each case based on the total weight of the composition, i. 3 to 25 wt.% binder, ii. 5 to 25 wt.% cross-linking polymer, iii. 0.5 to 10 wt.% particles having an average particle size of 1 to 20 µm, iv. 0.01 to 2 wt.% of an alkaline component, v. 30 to 70 wt.% water B) a hardener, characterized in that the hardener is a carbodiimide and in that the binder is a mixture of two aqueous binder dispersions each having a solids content of 25 to 60 wt.%, wherein the binder is in the form of an aqueous polyurethane dispersion and an aqueous anionic polyester polyurethane dispersion.

2. Kit-of-parts according to claim 1, characterized in that the composition contains 5 to 20 wt.%, in particular 8 to 15 wt.% or 10 to 13 wt.%, binder, in each case based on the total weight of the composition, and / or the binder is a mixture of two aqueous binder dispersions each having a solids content of 30 to 50 wt.% or 35 to 40 wt.%.

3. Kit-of-parts according to either claim 1 or 2, characterized in that the composition contains 8 to 22 wt.%, in particular 10 to 20 wt.% or 13 to 17 wt.%, of the cross-linking polymer, in each case based on the total weight of the composition, and / or the cross-linking polymer has at least one carboxyl group and / or at least one hydroxyl group and / or at least one amino group, in particular at least one carboxyl group, and / or is selected from the group consisting of anionic polyurethanes, aliphatic anionic polyurethanes, acrylic acid-containing polymers, polyurethane-acrylate emulsions, polyurethane-alkyd emulsions, polyurethanes, polyester polyurethanes, anionic polyester polyurethanes, aliphatic anionic polyester polyurethanes, polycarbonate ester polyurethanes, polyether polyols, polyacrylate dispersions, alkyd emulsions, and the hydroxy-functional polymers and mixtures thereof.

4. Kit-of-parts according to any of the preceding claims, characterized in that the composition contains 1 to 8 wt.%, in particular 2 to 7 wt.% or 3 to 6 wt.%, particles having an average particle size of 1 to 20 µm, in each case based on the total weight of the composition, and / or the particles having an average particle size of 1 to 20 µm have an average particle size of 2 to 17 µm, in particular 3 to 15 µm or 4 to 13 µm or 6 to 10 µm and / or are selected from the group consisting of polyurethane particles, polymethyl methacrylate particles, polymethyl urea particles, silicate acrylic resin polymer particles, polymeric hollow microspheres, cellulose fibers, textile fibers, cork dust and mixtures thereof, in particular silicate acrylic resin polymer particles.

5. Kit-of-parts according to any of the preceding claims, characterized in that the composition contains 0.01 to 1 wt.%, in particular 0.01 to 0.05 wt.%, of the alkaline component, in each case based on the total weight of the composition, and / or in that the alkaline component is selected from the group consisting of potassium hydroxide, sodium hydroxide, calcium hydroxide, ammonia, triethylamine, dimethylaminoethanol, aminomethyl propanol, dimethylglucamine and mixtures thereof and / or in that the alkaline component in its pure state is a water-soluble gas and / or in that the alkaline component is in the form of an aqueous solution, in particular aqueous ammonia.

6. Kit-of-parts according to any of the preceding claims, characterized in that the composition additionally contains 0.1 to 5 wt.%, in particular 0.1 to 3 wt.% or 0.5 to 1.5 wt.%, matting agent, in each case based on the total weight of the composition, wherein the matting agent is preferably selected from the group consisting of pyrogenic silica, polymethyl urea, ceramic microspheres, diatomaceous earth, quartz flour, talc and wax additives such as polyethylene waxes and / or has an average particle size, in particular a D50 value, of 1 to 20 µm, in particular 5 to 15 µm, in particular 7 to 13 µm, in particular 8 to 12 µm, in particular 9 to 11 µm.

7. Kit-of-parts according to any of the preceding claims, characterized in that the composition additionally contains at least one pigment and / or the composition additionally contains one or more further admixtures and / or additives selected from the group consisting of defoamers, dispersants, wetting agents, preservatives, stabilizers, surface protectants, water repellents, substrate wetting agents, solvents and thickeners.

8. Kit-of-parts for producing an aqueous coating agent containing, in each case based on the total weight of the coating agent, a. 3 to 25 wt.% binder, b. 5 to 25 wt.% cross-linking polymer, c. 0.5 to 10 wt.% particles having an average particle size of 1 to 20 µm, d. 0.01 to 2 wt.% of an alkaline component, e. 0.5 to 5 wt.% hardener, f. 30 to 70 wt.% water, wherein the aqueous coating agent has a pH of 8 to 10.5 and wherein the kit-of-parts comprises: A) an aqueous composition obtainable by means of a method comprising the following steps a. providing a composition containing, in each case based on the total weight of the composition, i. 3 to 25 wt.% binder, ii. 5 to 25 wt.% cross-linking polymer, iii. 0.5 to 10 wt.% particles having an average particle size of 1 to 20 µm, iv. 0.01 to 2 wt.% of an alkaline component, v. 30 to 70 wt.% water, b. dispersing the components mentioned in a. B) a hardener, characterized in that the hardener is a carbodiimide and in that the binder is a mixture of two aqueous binder dispersions each having a solids content of 25 to 60 wt.%, wherein the binder is in the form of an aqueous polyurethane dispersion and an aqueous anionic polyester polyurethane dispersion.

9. Kit-of-parts according to claim 8, characterized in that the composition contains 5 to 20 wt.%, in particular 8 to 15 wt.% or 10 to 13 wt.%, binder and / or 8 to 22 wt.%, in particular 10 to 20 wt.% or 13 to 17 wt.%, cross-linking polymer and / or 1 to 8 wt.%, in particular 2 to 7 wt.% or 3 to 6 wt.%, particles having an average particle size of 1 to 20 µm and / or 0.01 to 1 wt.%, in particular 0.01 to 0.05 wt.%, of the alkaline component and / or additionally 0.1 to 5 wt.%, in particular 0.1 to 3 wt.% or 0.5 to 1.5 wt.%, matting agent, in each case based on the total weight of the composition.

10. Kit-of-parts according to either claim 8 or 9, characterized in that the binder is defined according to claim 2 and / or the cross-linking polymer is defined according to claim 3 and / or the particles having an average particle size of 1 to 20 µm are defined according to claim 4 and / or the alkaline component is defined according to claim 5 and / or the optional matting agent is defined according to claim 6 and / or the composition additionally contains at least one pigment and / or one or more additives selected from the group consisting of defoamers, dispersants, wetting agents, preservatives, stabilizers, surface protectants, water repellents, substrate wetting agents, solvents and thickeners.

11. Kit-of-parts according to any of the preceding claims, characterized in that the hardener is an agent that is capable of forming, together with carboxyl groups, an active ester, namely polymeric carbodiimide.

12. Aqueous coating agent containing, in each case based on the total weight of the coating agent, a. 3 to 25 wt.% binder, b. 5 to 25 wt.% cross-linking polymer, c. 0.5 to 10 wt.% particles having an average particle size of 1 to 20 µm, d. 0.01 to 2 wt.% of an alkaline component, e. 0.5 to 5 wt.% hardener, f. 30 to 70 wt.% water, wherein the aqueous coating agent has a pH of 8 to 10.5, characterized in that the hardener is a carbodiimide and in that the binder is a mixture of two aqueous binder dispersions each having a solids content of 25 to 60 wt.%, wherein the binder is in the form of an aqueous polyurethane dispersion and an aqueous anionic polyester polyurethane dispersion.

13. Aqueous coating agent according to claim 12, characterized in that the coating agent contains 5 to 20 wt.%, in particular 8 to 15 wt.% or 10 to 13 wt.%, binder and / or 8 to 22 wt.%, in particular 10 to 20 wt.% or 13 to 17 wt.%, cross-linking polymer and / or 1 to 8 wt.%, in particular 2 to 7 wt.% or 3 to 6 wt.%, particles having an average particle size of 1 to 20 µm and / or 0.01 to 1 wt.%, in particular 0.01 to 0.05 wt.%, of the alkaline component and / or 0.5 to 4 wt.%, in particular 1 to 2 wt.%, hardener and / or additionally 0.1 to 5 wt.%, in particular 0.1 to 3 wt.% or 0.5 to 1.5 wt.%, of matting agent, in each case based on the total weight of the coating agent.

14. Aqueous coating agent according to either claim 12 or 13, characterized in that the binder is defined according to claim 2 and / or the cross-linking polymer is defined according to claim 3 and / or the particles having an average particle size of 1 to 20 µm are defined according to claim 4 and / or the alkaline component is defined according to claim 5 and / or the optional matting agent is defined according to claim 6 and / or the hardener is defined according to claim 11 and / or the composition additionally contains at least one pigment and / or one or more additives selected from the group consisting of defoamers, dispersants, wetting agents, preservatives, stabilizers, surface protectants, water repellents, substrate wetting agents, solvents and thickeners.

15. Use of an aqueous coating agent according to any of claims 12 to 14 as a lacquer, in particular for indoor and / or outdoor use.