Coating composition and coated product comprising a coating formed by the coating composition

Abstract

The present invention relates to a coating composition and a coated product comprising a coating formed by the coating composition. The coating composition described herein comprises a film-forming resin, a cosolvent and an additive, wherein the additive comprises at least one nitrogen-containing condensed ring compound or an aromatic-substituted nitrogen heterocyclic compound, wherein the nitrogen-containing condensed ring compound or the aromatic-substituted nitrogen heterocyclic compound has a ring containing an NH-bond. The coating composition described herein can form a dense paint film having excellent hardness, chemical resistance and / or water resistance.

Description

Technical Field

[0001] The present invention relates to a coating composition, in particular, a coating composition capable of forming a dense paint film, and a coated article comprising a coating layer formed from the coating composition. Background Art

[0002] In the coatings industry, crosslinking agents are widely used to accelerate the crosslinking of polymers and improve the hardness, chemical resistance, water resistance, etc. of the paint film. However, currently commonly used curing agents include allergenic substances, such as aziridine.

[0003] As people pay more and more attention to health and environmental issues, they are increasingly hoping to reduce or even avoid the use of allergenic substances in coatings. However, reducing or avoiding the use of allergenic substances such as aziridine will lead to significant deterioration of paint film performance, especially chemical resistance and water resistance.

[0004] In order to form a dense paint film and reduce the use of allergenic substances, some existing solutions use more complex functional monomers or special resin particle structures to design film-forming resins to obtain dense paint films. These solutions not only involve complex resin synthesis processes, but also have low yields, difficult to control product quality, and a small scope of application, so they are costly and not suitable for industrial production and application. Technicians have also designed some modified curing agents to suppress allergenicity. However, these modified curing agents themselves have complex synthesis processes and high production costs, which greatly limits their scope of application and application prospects in the market. Summary of the invention

[0005] Therefore, the coatings industry still needs improved coating compositions capable of forming dense coating films with excellent resistance properties while containing less or even no allergenic substances.

[0006] The above objectives are achieved by the coating compositions described herein.

[0007] The first aspect of the present application provides a coating composition comprising a film-forming resin, a cosolvent and an additive, wherein the additive comprises at least one nitrogen-containing condensed ring compound or an aromatic-substituted nitrogen-containing heterocyclic compound, wherein the nitrogen-containing condensed ring compound or the aromatic-substituted nitrogen-containing heterocyclic compound has a ring containing an -NH- bond.

[0008] A second aspect of the present application provides a multi-component coating composition, comprising: A) the coating composition as described above; and B) at least one cross-linking agent.

[0009] A third aspect of the present application provides a coated product comprising a substrate and the coating composition described herein coated on the substrate or a cured coating formed therefrom.

[0010] The present application also provides the use of nitrogen heterocyclic compounds or aromatic nitrogen heterocyclic compounds in coating compositions. The paint film formed by the coating composition of the present invention has excellent compactness, chemical resistance and / or water resistance.

[0011] The inventors have found that the coating composition comprising a nitrogen-containing condensed ring compound or an aromatic-substituted nitrogen heterocyclic compound described herein can form a dense paint film, improving the chemical resistance and / or water resistance of the paint film. Moreover, the nitrogen-containing condensed ring compound or the aromatic-substituted nitrogen heterocyclic compound described herein is a non-allergenic substance. Therefore, the coating composition described herein can reduce or even avoid the use of allergenic substances, while obtaining improved chemical resistance and / or water resistance. This is very unexpected.

[0012] In addition, the technical solution of the present application may also have the advantages of simple operation, safety, effectiveness, and low cost.

[0013] The details of one or more embodiments of the invention are set forth in the description which follows. Other features, objects, and advantages of the invention will become apparent from the description and claims. DETAILED DESCRIPTION

[0014] definition

[0015] As used herein, "a", "an", "the", "at least one" and "one or more" and the absence of quantifiers may be used interchangeably unless otherwise indicated. Thus, for example, a coating composition comprising "an" additive may be interpreted to mean that the coating composition comprises "one or more" additives. Unless otherwise indicated herein, the use of the singular form herein is intended to include the plural form.

[0016] Where a composition is described as comprising or including specific components, it is contemplated that optional components not contemplated by the present invention are not excluded from the composition, and that the composition may consist of or be composed of the contemplated components; or where a method is described as comprising or including specific process steps, it is contemplated that optional process steps not contemplated by the present invention are not excluded from the method, and that the method may consist of or be composed of the contemplated process steps.

[0017] For the sake of simplicity, only some numerical ranges are explicitly disclosed herein. However, it should be understood that any range formed by combining any lower limit with any upper limit belongs to the content explicitly disclosed in the present invention; any range formed by combining any lower limit with other lower limits also belongs to the content explicitly disclosed in the present invention, and similarly, any range formed by combining any upper limit with other upper limits also belongs to the content explicitly disclosed in the present invention.

[0018] Unless otherwise indicated, each point or single value between the endpoints of a range is included in the range. For example, a range of 1 to 5 includes the values ​​1, 1.5, 2, 2.75, 3, 3.80, 4, 5, etc. Moreover, a disclosed numerical range includes all subset ranges within the broader range, for example, a range of 1 to 5 includes subranges 1 to 4, 1.5 to 4.5, 1 to 2, etc. Thus, each point or single value can be combined as a lower limit or upper limit with any other point or single value or with other lower limits or upper limits, and the resulting range belongs to the content clearly disclosed in the present invention.

[0019] In the context of describing that a composition does not contain a certain ingredient, the term "does not contain" means that the composition does not contain the intentionally added ingredient. Considering the complexity of the specific composition of each component in the actual formulation process, the phrase "does not contain a certain ingredient" can be understood as the composition containing less than 1% by weight of the ingredient based on the total weight of the composition, more preferably less than 0.5% by weight, even more preferably less than 0.2% by weight, and most preferably less than 0.1% by weight.

[0020] The coating compositions described herein can be mono-component or multi-component. In the context of a "multi-component" coating composition, the term "multi-component" means that the coating composition includes two or more components that are stored or packaged separately and then mixed together before being applied to a substrate. In some embodiments of the present invention, the multi-component coating composition consists of two components, i.e., a two-component coating composition.

[0021] The coating composition described herein can be a "water-based" coating composition. The term "water-based" refers to that the solvent or carrier fluid of the coating composition mainly or primarily comprises water. For example, in some embodiments, based on the gross weight of the solvent or carrier fluid, the solvent or carrier fluid comprises at least about 50 wt %, preferably at least about 60 wt %, more preferably at least 70 wt % and about 100 wt % water at most. For example, based on the gross weight of the solvent or carrier fluid, the solvent or carrier fluid comprises about 80 wt %, about 85 wt % or about 90 wt % water.

[0022] The term "sensitizing substance" as used herein refers to a substance that may cause sensitization through skin contact. In particular, a "sensitizing substance" is a substance that is clearly stated as "having a sensitizing effect" in the Material Safety Data Sheet (MSDS). Examples of sensitizing substances include aziridine and substances with similar structures.

[0023] As used herein, the term "dispersion" conforms to the definition in the IUPAC Compendium of Chemical Terminology (2007), which defines a dispersion as a material comprising more than one phase, wherein at least one phase consists of finely divided phase domains, typically in the colloidal size range, distributed throughout a continuous phase domain.

[0024] When used in this article, the term "aqueous dispersion containing polymer particles" refers to a stable dispersion of a synthetic resin (i.e., a polymer) in the form of particles in an aqueous liquid medium, optionally with the aid of a suitable dispersing aid such as a surfactant, a cosolvent. Therefore, in this application, when used for a polymer, unless otherwise stated, the terms "aqueous latex" and "aqueous dispersion" can be used interchangeably. Methods for preparing aqueous latexes are known in the art, for example, they can be prepared using emulsion polymerization processes known to those skilled in the art. The emulsion polymerization preparation process generally comprises the following steps: optionally, under the action of a suitable emulsifier and / or a dispersion stabilizer and with the aid of stirring, a polymerizable monomer is dispersed into an emulsion in water, and polymerization of the monomer is initiated, for example, by adding an initiator. In the present invention, the polymer particles can be modified by, for example, modification of organic functional groups (including, but not limited to, carboxyl, hydroxyl, amino, isocyanate, sulfonic acid, etc.) to obtain an aqueous latex having desired properties (e.g., dispersibility). Therefore, in the present invention, the term "aqueous latex" includes not only dispersions of unmodified polymer particles in an aqueous medium, but also dispersions of polymer particles modified with organic functional groups in an aqueous medium.

[0025] The term "alkyl" as used herein refers to a straight or branched hydrocarbon containing 1 to 10 carbon atoms, preferably 1, 2, 3, 4, 5 or 6 carbons. Representative examples of alkyl include, but are not limited to, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl, n-hexyl, 3-methylhexyl, 2,2-dimethylpentyl, 2,3-dimethylpentyl, n-heptyl, n-octyl, n-nonyl and n-decyl. Each carbon atom of the alkyl group may be substituted by 0, 1 or 2 substituents selected from acyl, acyloxy, alkoxy, alkoxyalkoxy, alkoxyalkyl, alkoxycarbonyl, alkoxyimino, alkoxysulfonyl, alkylcarbonyl, alkylsulfonyl, amide, carboxyl, cyano, cycloalkyl, fluoroalkoxy, formyl, halogenated alkoxy, halogenated alkyl, halogen, hydroxyl, hydroxyalkyl, sulfhydryl, nitro, oxo and alkylthio.

[0026] The term "alkylamino" as used herein refers to an alkyl group, as defined herein, appended to the parent molecular moiety through an NH group. Representative examples of alkylamino include, but are not limited to, methylamino, ethylamino, isopropylamino and butylamino.

[0027] The term "alkylcarbonyl" as used herein refers to an alkyl group, as defined herein, appended to the parent molecular moiety through a carbonyl group. Representative examples of alkylcarbonyl include, but are not limited to, methylcarbonyl, ethylcarbonyl, isopropylcarbonyl, n-propylcarbonyl, and the like.

[0028] The term "alkylsulfonyl" as used herein refers to an alkyl group, as defined herein, appended to the parent molecular moiety through a sulfonyl group. Representative examples of alkylsulfonyl include, but are not limited to, methylsulfonyl and ethylsulfonyl.

[0029] The term "alkoxy" as used herein refers to an alkyl group, as defined herein, attached to the parent molecular moiety through an oxygen atom. Representative examples of alkoxy include, but are not limited to, methoxy, ethoxy, propoxy, 2-propoxy, butoxy, tert-butoxy, pentoxy, and hexoxy.

[0030] The term "alkoxycarbonyl" as used herein refers to an alkoxy group, as defined herein, appended to the parent molecular moiety through a carbonyl group. Representative examples of alkoxycarbonyl include, but are not limited to, methoxycarbonyl, ethoxycarbonyl, isopropoxycarbonyl and tert-butoxycarbonyl.

[0031] The term "alkoxyalkyl" as used herein, refers to an alkoxy group, as defined herein, appended to the parent molecular moiety through an alkyl group. Representative examples of alkoxyalkyl include, but are not limited to, tert-butoxymethyl, 2-ethoxyethyl, 2-methoxyethyl and methoxymethyl.

[0032] The term "cycloalkyl" as used herein refers to a saturated cyclic hydrocarbon group containing 3-8 carbons. Examples of cycloalkyl include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl and cyclooctyl. Each carbon atom of cycloalkyl may be substituted by 0, 1 or 2 substituents selected from acyl, acyloxy, alkenyl, alkoxy, alkoxyalkoxy, alkoxyalkyl, alkoxycarbonyl, alkoxyimino, alkoxysulfonyl, alkyl, alkylcarbonyl, alkylsulfonyl, alkynyl, amide, carboxyl, cyano, cycloalkyl, fluoroalkoxy, formyl, halogenated alkoxy, haloalkyl, halogen, hydroxyl, hydroxyalkyl, sulfydryl, nitro and alkylthio.

[0033] The term "acyl" as used herein refers to an alkyl group defined herein that is connected to the parent molecular moiety through a carbonyl group. Representative examples of acyl include, but are not limited to, acetyl, 1-oxopropyl, 2,2-dimethyl-1-oxopropyl, 1-oxobutyl and 1-oxopentyl.

[0034] The term "halogen" or "halo" refers to Cl, Br, I or F.

[0035] Term used herein " haloalkyl " refers to at least one halogen defined herein that is connected to the parent molecular moiety through alkyl defined herein.Representative examples of haloalkyl include but are not limited to chloromethyl, 2-fluoroethyl, trifluoromethyl, pentafluoroethyl and 2-chloro-3-fluoropentyl.

[0036] The term "haloalkoxy" as used herein, means at least one halogen, as defined herein, appended to the parent molecular moiety through an alkoxy group, as defined herein. Representative examples of haloalkoxy include, but are not limited to, 2-fluoroethoxy, trifluoromethoxy, and pentafluoroethoxy.

[0037] The term "aryl" as used herein refers to phenyl, bicyclic aryl or tricyclic aryl. Bicyclic aryl is connected to the parent molecular moiety through any carbon atom contained in the bicyclic aryl. Representative examples of bicyclic aryl include but are not limited to dihydroindenyl, indenyl, naphthyl, dihydronaphthyl and tetrahydronaphthyl. Tricyclic aryl is a tricyclic aryl ring system, such as anthracene or phenanthrene, a bicyclic aryl fused with a cycloalkyl, a bicyclic aryl fused with a cycloalkenyl, and a bicyclic aryl fused with a phenyl. Tricyclic aryl is connected to the parent molecular moiety through any carbon atom contained in the tricyclic aryl. Representative examples of tricyclic aryl rings include but are not limited to anthracenyl, phenanthryl, azulenyl (azulenyl), dihydroanthracenyl, fluorenyl and tetrahydrophenanthryl.

[0038] The carbon atoms of the aryl group may be substituted with one or more substituents independently selected from acyl, acyloxy, alkenyl, alkoxy, alkoxyalkoxy, alkoxyalkyl, alkoxycarbonyl, alkoxyimino, alkoxysulfonyl, alkyl, alkylcarbonyl, alkylsulfonyl, alkynyl, amide, carboxyl, cyano, cycloalkyl, fluoroalkoxy, formyl, haloalkoxy, haloalkyl, halogen, hydroxyl, hydroxyalkyl, mercapto, nitro and alkylthio. In the case where the aryl group is phenyl, the number of substituents is 0, 1, 2, 3, 4 or 5. In the case where the aryl group is a bicyclic aryl group, the number of substituents is 0, 1, 2, 3, 4, 5, 6, 7, 8 or 9. In the case where the aryl group is a tricyclic aryl group, the number of substituents is 0, 1, 2, 3, 4, 5, 6, 7, 8 or 9.

[0039] The term "aralkyl" as used herein, refers to an aryl group, as defined herein, appended to the parent molecular moiety through an alkyl group, as defined herein. Representative examples of aralkyl include, but are not limited to, benzyl, 2-phenylethyl and 3-phenylpropyl.

[0040] The term "heteroaryl" as used herein can be a monocyclic or bicyclic ring. The carbon in the "heteroaryl" can be optionally substituted by one or more substituents, and the substituents are independently selected from acyl, acyloxy, alkenyl, alkoxy, alkoxyalkoxy, alkoxyalkyl, alkoxycarbonyl, alkoxyimino, alkoxysulfonyl, alkyl, alkylcarbonyl, alkylsulfonyl, alkynyl, amide, carboxyl, cyano, cycloalkyl, fluoroalkoxy, formyl, haloalkoxy, haloalkyl, halogen, hydroxyl, hydroxyalkyl, sulfhydryl, nitro and alkylthio. Monocyclic heteroaryl or 5- or 6-membered heteroaromatic ring is substituted by 0, 1, 2, 3, 4 or 5 substituents. Bicyclic heteroaryl or 8- to 12-membered bicyclic heteroaromatic ring is substituted by 0, 1, 2, 3, 4, 5, 6, 7, 8 or 9 substituents. The heteroaryl of the present invention can exist as tautomers.

[0041] The terms "preferred" and "preferably" refer to embodiments of the present invention that may provide certain benefits under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. In addition, the recitation of one or more preferred embodiments does not mean that other embodiments are not useful, and is not intended to exclude other embodiments from the scope of the present invention.

[0042] According to a first aspect of the present invention, there is provided a coating composition comprising a film-forming resin, a cosolvent and an additive, wherein the additive comprises at least one nitrogen-containing condensed ring compound or an aromatic-substituted nitrogen heterocyclic compound, wherein the nitrogen-containing condensed ring compound or the aromatic-substituted nitrogen heterocyclic compound has a ring containing an -NH- bond. The coating composition described herein can form a dense paint film with excellent water resistance and chemical resistance.

[0043] It is known in the art that nitrogen-containing condensed ring compounds and aromatic-substituted nitrogen heterocyclic compounds have special π-electron aromatic rings. In this article, in addition to the special π-electron aromatic ring, nitrogen-containing condensed ring compounds and aromatic-substituted nitrogen heterocyclic compounds also have a ring containing -NH-bonds. The nitrogen-containing condensed ring compounds and aromatic-substituted nitrogen heterocyclic compounds herein can also be amine compounds containing a benzene ring.

[0044] In some embodiments, the nitrogen-fused ring compound and the aromatic-substituted nitrogen heterocyclic compound may have a five-membered nitrogen heterocyclic structure and / or a six-membered nitrogen heterocyclic structure.

[0045] In some preferred embodiments, the nitrogen heterocyclic compound and the aromatic substituted nitrogen heterocyclic compound have a five-membered nitrogen heterocyclic structure. The nitrogen heterocyclic structure may have one or more nitrogen atoms. Preferably, the nitrogen heterocyclic structure may have 2 to 3 nitrogen atoms, more preferably 3 nitrogen atoms.

[0046] In the aza-fused ring compounds and aromatic-substituted aza-heterocyclic compounds described herein, a five-membered aza-heterocyclic or six-membered aza-heterocyclic structure may be fused or chemically bonded to a benzene ring, wherein the benzene ring may be optionally substituted or optionally aza-. In some embodiments, the benzene ring is unsubstituted. In some embodiments, the benzene ring is not aza-. In some preferred embodiments, the benzene ring is unsubstituted and not aza-.

[0047] In other embodiments, in the nitrogen heterocyclic compound or the aromatic substituted nitrogen heterocyclic compound, the benzene ring is substituted. For example, the benzene ring can be substituted by one or more of hydroxyl, alkyl, alkylamino, alkylcarbonyl, alkylsulfonyl, alkoxy, alkoxycarbonyl, alkoxyalkyl, alkoxyimino, alkoxysulfonyl, alkylthio, cycloalkyl, acyl, halogen, haloalkyl, haloalkoxy, hydroxyalkoxy, aryl, aralkyl and heteroaryl. Preferably, the benzene ring can be substituted by one or more of alkyl, alkylamino, cycloalkyl, halogen, haloalkyl, haloalkoxy, aryl, aralkyl and heteroaryl.

[0048] In some embodiments, in the nitrogen-fused ring compound or the aromatic nitrogen-substituted heterocyclic compound, the benzene ring may be substituted with one or more nitrogens. Preferably, the benzene ring is substituted with one or two nitrogens.

[0049] In the aza-fused ring compound, the aza-fused ring is fused to a benzene ring. In some embodiments, the aza-fused ring compound may include benzotriazole Benzimidazole Indole Purine and phthalimide Any combination of one or more of. Preferably, the aza-fused ring compound comprises any combination of one or more of benzotriazole, benzimidazole and indole. More preferably, the aza-fused ring compound comprises benzotriazole and / or benzimidazole. Particularly preferably, the aza-fused ring compound comprises benzotriazole. As described above, the benzene ring may be optionally substituted or optionally aza. The preferred manner of the substituent is as described above.

[0050] In the aromatic substituted nitrogen heterocyclic compound, the nitrogen heterocyclic ring may be chemically bonded to the aromatic group. The aromatic group preferably has one or more benzene ring structures. Preferably, the aromatic substituted nitrogen heterocyclic compound may be a phenyl substituted nitrogen heterocyclic compound. In some embodiments, the aromatic substituted nitrogen heterocyclic compound may include 2-phenylimidazole and 2-phenyl-4-methylimidazole In the aromatic substituted nitrogen heterocyclic compound, the benzene ring may be optionally substituted or optionally aza. The preferred form of the substituent is as described above.

[0051] The inventors were surprised to find that the use of aza-condensed ring compounds or aromatic-substituted nitrogen heterocyclic compounds with a ring containing -NH- bonds, especially the preferred embodiments described herein, can improve the performance of the paint film formed by curing the coating composition, such as resistance and hardness. The improvement of resistance includes the improvement of chemical resistance, such as the improvement of at least one of alcohol resistance, acid resistance, water resistance, and heat resistance, especially alcohol resistance and / or water resistance. By adopting some preferred embodiments described herein, the paint film obtained has a resistance comparable to or even better than that using a crosslinking agent (such as polycarbodiimide, PCDI in English), and more preferably improved hardness. It can be seen that by the aza-condensed ring compounds or aromatic-substituted nitrogen heterocyclic compounds described herein, especially the preferred methods and dosages thereof, a dense paint film that can be achieved using conventional crosslinking agents can be obtained. This is unexpected by those skilled in the art.

[0052] Without wishing to be bound by theory, it is believed that when combined with a film-forming resin or emulsion, the -NH- bond in the nitrogen-containing fused ring compound or the aromatic-substituted nitrogen heterocyclic compound will react with the polymer chain of the film-forming resin to introduce the aromatic group and the nitrogen heterocycle into the polymer chain, thereby increasing the hydrophobicity of the paint film, increasing the density of the paint film, and thus improving the resistance of the paint film.

[0053] Based on the total weight of the coating composition, the amount of the aza-condensed ring compound or the aromatic group-substituted nitrogen heterocyclic compound can be 0.02-3% by weight, preferably 0.05-2.5% by weight, more preferably 0.1-2% by weight, and even more preferably 0.2-1% by weight. The inventors are also surprised to find that only a very low amount of aza-condensed ring compound or an aromatic group-substituted nitrogen heterocyclic compound can significantly improve the hardness and tolerance of the paint film. Moreover, using the above-mentioned preferred dosage, the paint film has further improved overall properties (including not only hardness and tolerance, but also other paint film properties, such as transparency) after curing. The inventors also found that when the amount of the aza-condensed ring compound or the aromatic group-substituted nitrogen heterocyclic compound is further increased, for example, 3% by weight or higher, the transparency of the paint film is significantly reduced.

[0054] In this article, film-forming resin refers to a resin that can form a paint film when the coating is cured. Various types of film-forming resins can be used. Examples of common film-forming resins include self-crosslinking resins, polyurethane resins, polyurethane acrylate resins, alkyd resins, acrylic resins, isocyanate resins, polyurethane acrylate modified epoxy resins, unsaturated polyester resins, acrylic epoxy resins and nitro resins. Preferably, the film-forming resin comprises one or more of self-crosslinking resins, polyurethane resins, polyurethane acrylate resins, alkyd resins and acrylic resins. More preferably, the film-forming resin comprises one or more of self-crosslinking resins, polyurethane resins and polyurethane acrylate resins.

[0055] In some embodiments, the film-forming resin comprises a self-crosslinking resin. A self-crosslinking resin refers to a resin that can be crosslinked without the addition of a crosslinking agent. Examples of self-crosslinking resins include self-crosslinking polyester resins, self-crosslinking polyamide resins, self-crosslinking acrylic resins, self-crosslinking epoxy resins, and self-crosslinking olefin resins. Preferably, the self-crosslinking resin comprises a self-crosslinking acrylic resin. In an exemplary embodiment, the self-crosslinking resin comprises an acrylic siloxane resin.

[0056] Self-crosslinking resin can be made from monomers with self-crosslinking groups. For example, self-crosslinking acrylic resin can be made from functional monomers containing ketocarbonyl or epoxy groups and hydrazide compounds. Examples of functional monomers containing ketocarbonyl or epoxy groups can include, for example, diacetone acrylamide (DAAM), methyl vinyl ketone, acetoacetoxyethyl methacrylate (AAEM), glycidyl methacrylate (GMA) and (meth) acetamidoethyl acrylate, etc. In some preferred embodiments, the functional monomer containing ketocarbonyl includes one or more of DAAM, AAEM and GMA. More preferably, the functional monomer containing ketocarbonyl includes DAAM, AAEM or a combination of the two.

[0057] Since DAAM has low toxicity and simple synthetic raw materials, and is particularly beneficial for enhancing the adhesion performance of coatings, DAAM is currently mostly used as a functional monomer containing a ketocarbonyl group. In an exemplary embodiment, the functional monomer containing a ketocarbonyl group includes DAAM. In another exemplary embodiment, the functional monomer containing a ketocarbonyl group includes AAEM.

[0058] Examples of hydrazide compounds may include, for example, adipic acid dihydrazide (ADH), succinic acid dihydrazide, carbonate dihydrazide, oxalic acid dihydrazide, N(CH2CH2CONHNH2)3 and (H2NHNCOCH2CH2)2NCH2CH2N(CHCHCONHNH2)2 and polymer polyhydrazide.

[0059] Self-crosslinking acrylic resin can be obtained by a synthetic method. For example, diacetone acrylamide (DAAM), methyl methacrylate (MMA), butyl acrylate (BA) and methacrylic acid (MAA) are used as comonomers to synthesize self-crosslinking closed polyacrylate emulsion (PAE) by semi-continuous seed emulsion polymerization.

[0060] Self-crosslinking acrylic resins are commercially available, for example, as self-crosslinking acrylic emulsions. Exemplary commercially available self-crosslinking acrylic emulsions include, but are not limited to, ROSHIELD TM 3311 and ROSHIELD TM 3188.

[0061] In some embodiments, the film-forming resin comprises a polyurethane resin. Various types of polyurethane resins can be used. The polyurethane resin can be in the form of a polyurethane dispersion (PUD), for example, the U series (such as U 6150, U 9380 and U9900) available from Alberdingk Boley, Inc., the Bayhydrol series (such as Bayer) available from Bayer, UH 2558 and UH 2606) and Dispercoll series, NeoRez series purchased from DSM (such as R-2180, R-2005, R-9029 and R-2190), the SYNTEGRA series available from Dow, or the Sancure series (such as Sancure 843, Sancure 898, and Sancure 12929) available from Lubrizol, Inc. (Cleveland, OH).

[0062] In some embodiments, the film-forming resin comprises a polyurethane acrylate (PUA) resin. Various types of polyurethane acrylate resins can be used. As examples, the Hybridur series (such as Hybridur 870 and Hybridur 878) available from Air Products, Inc., the APU series (APU 10140, APU 10600, and APU10620) available from Alberdingk Boley, Inc., the APU series (APU 10140, APU 10600, and APU10620) available from DSM, and the APU series (such as APU 10140, APU 10600, and APU 10620) available from DSM can be used. series (NeoPac R-9036 and NeoPac E-129), CONFON 7005 purchased from Xiangfeng Chemical, PROSPERSE purchased from DOW TM 100.

[0063] Preferably, the film-forming resin has a side chain containing a ketocarbonyl group (-(C=O)-) and / or an epoxy group. Preferably, the side chain of the polymer contains a ketocarbonyl group.

[0064] The amount of the film-forming resin may be about 45-95 wt %, preferably about 50-90 wt %, more preferably about 60-85 wt %, even more preferably about 65-80 wt %, based on the total weight of the coating composition.

[0065] In the coating composition, the cosolvent may be an organic solvent commonly used in the art. For example, the cosolvent may be one or at least two of alkyl alcohol, alcohol ether, ketone or ester. Examples of co-solvents include, but are not limited to, ethanol, isopropanol, butanol, butoxydiglycol, butyl glycol, dipropylene glycol methyl ether (DPM), propylene glycol methyl ether, ethylene glycol butyl ether, dipropylene glycol butyl ether (DPnB), ethylene glycol ethyl ether, ethylene glycol monomethyl ether, ethylene glycol monohexyl ether, ethylene glycol mono-n-butyl ether, diethylene glycol monomethyl ether, ethylene glycol mono-n-butyl ether, tripropylene glycol monomethyl ether, ethylene dimethanol monoisobutyl ether, diethylene glycol monoisobutyl ether, propylene glycol monoisobutyl ether, ethylene glycol monophenyl ether, propylene glycol monophenyl ether, ethylene glycol monomethyl ether acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, toluene, xylene, trimethylbenzene, 100# solvent naphtha, 2-methylpropanol acetate and n-butyl acetate, and any combination thereof.

[0066] Based on the total weight of the coating composition, the amount of the cosolvent may be about 4-10 wt %, preferably about 5-9 wt %, more preferably about 6-8 wt %. For example, based on the total weight of the coating composition, the amount of the cosolvent may be even more preferably about 6.5, 7, 7.5 or 8 wt %.

[0067] Preferably, the coating composition described herein. Based on the total weight of the coating composition, the amount of water can be about 5-40 weight %, preferably about 8-35 weight %, more preferably about 10-30 weight %. For example, based on the total weight of the coating composition, the amount of water can be about 12, 13, 14, 15, 16, 18, 20, 22 or 25 weight %.

[0068] The coating composition of the present invention may optionally further comprise pigments, other additives or any combination thereof.

[0069] In some preferred embodiments, the pigment can be a spherical, fibrous, flaky or other regular or irregularly shaped material with a micron or even nanometer size. Examples of pigments include metal oxides such as titanium dioxide, iron oxide, zinc oxide, zirconium oxide, aluminum oxide; mixed metal oxides of two or more metals, the metals including manganese, nickel, titanium, chromium, antimony, magnesium, cobalt, iron or aluminum; oxymetallic compounds such as bismuth vanadate, cobalt aluminate, cobalt zincate, zinc chromate; pigments with metallic effects such as aluminum flakes, copper and copper / zinc alloys; pearlescent pigments such as lead carbonate and bismuth oxychloride; talc; and any combination thereof. Preferably, the pigment is titanium dioxide, more preferably titanium dioxide in powder form. Particularly preferably, the pigment comprises rutile titanium dioxide. All types of thickeners are commercially available commodities. For example, as an example of a pigment, BLR-688 titanium dioxide purchased from Baili Lian can be used.

[0070] Based on the total weight of the coating composition, the total amount of the pigment can be 0 wt % to 50 wt %, such as 1 wt % to 45 wt %, 2 wt % to 40 wt %, 3 wt % to 35 wt %, 4 wt % to 30 wt %, 5 wt % to 25 wt %, 10 wt % to 20 wt %. Further preferably, based on the total weight of the coating composition, the amount of each pigment is independently 0 wt % to 50 wt %, 1 wt % to 40 wt %, 2 wt % to 30 wt %, 3 wt % to 20 wt %, 4 wt % to 15 wt %.

[0071] In the coating composition, optional other additives can be those commonly used in the coating composition. These additives will not adversely affect the coating composition or the cured coating obtained therefrom. Suitable additives include, for example, those reagents that can improve the processing properties or manufacturing properties of the composition, enhance the aesthetics of the composition, or improve the specific functional properties or characteristics (such as adhesion to substrate) of the coating composition or the cured coating obtained therefrom. According to specific needs, the additives that can be included in the coating composition are, for example, but not limited to, fillers, anti-skinning agents, driers, emulsifiers, anti-migration aids, antibacterial agents, chain extenders, lubricants, wetting agents, biocides, plasticizers, defoamers, colorants, waxes, antioxidants, anticorrosives, antifreeze agents, rheological aids, thickeners, dispersants, pH regulators, adhesion promoters, UV stabilizers, pH regulators, leveling agents or combinations thereof. The content of each optional component is enough to achieve its intended purpose, but preferably, such content will not adversely affect the coating composition or the cured coating obtained therefrom.

[0072] Preferably, other additives include one or more of a defoamer, a leveling agent, a thickener and a wetting agent. As an example of a leveling agent, BYK 358 purchased from BYK can be used. As an example of a defoamer, BYK-071 purchased from BYK can be used.

[0073] In a preferred embodiment, the coating composition of the present invention comprises about 0 to about 30 wt %, preferably about 0.1 to about 25 wt %, of other additives, relative to the total weight of the coating composition. Specifically, the amount of each other additive in the coating composition is 0.1 wt % to 10.0 wt %, such as 0.2 wt %, 0.3 wt %, 0.4 wt %, 0.6 wt %, 0.7 wt %, 0.8 wt %, 0.9 wt %, 1 wt %, 1.1 wt %, 1.2 wt %, 1.3 wt %, 1.4 wt %, 1.5 wt %, 1.8 wt %, 2.0 wt %, 2.5 wt %, 3.0 wt %, 3.5 wt %, 4.0 wt %, 4.5 wt %, 5.0 wt %, 6.0 wt %, 8.0 wt % or 9.0 wt %, relative to the total weight of the coating composition.

[0074] Suitable thickeners include one or more of cellulose thickeners, alkali swellable thickeners, polyurethane thickeners, hydrophobically modified polyurethane thickeners, and inorganic thickeners. All types of thickeners are commercially available commodities. For example, as an example of a cellulose thickener, methyl hydroxyethyl cellulose ether thickener HEC 250H4BR purchased from ASHLAND, USA, can be used. As an example of an alkali swellable thickener, ASE60 purchased from Dow Chemical DOW, USA, can be used. As an example of a polyurethane thickener, RM-2050D purchased from Dow Chemical DOW, USA, or U902 and U903 purchased from Wanhua Chemical can be used. As an example of an inorganic thickener, bentonite can be used.

[0075] In some embodiments, the coating composition of the present invention may include about 0.1 wt % to about 5.0 wt %, preferably about 0.5 wt % to about 4.0 wt %, more preferably 1.0 wt % to 3.0 wt % of thickener relative to the total weight of the coating composition. For example, the coating composition of the present invention includes 1.2 wt %, 1.5 wt %, 2.0 wt % or 2.5 wt % of thickener relative to the total weight of the coating composition.

[0076] The coating composition according to the present invention may optionally contain a defoamer. Suitable defoamers include one or more of organosiloxane defoamers, grease defoamers, polyether defoamers, and polyether-modified organosilicon defoamers. Preferably, nonionic mineral oils may be used. All types of defoamers are commercially available products. As an example of a defoamer, CF-246 purchased from Blackburn may be used.

[0077] In some embodiments, the coating composition of the present invention may include about 0 wt % to about 1.0 wt %, preferably about 0.3 wt % to about 0.5 wt % of a defoaming agent, relative to the total weight of the coating composition.

[0078] The coating composition described herein can be a single component. In some preferred embodiments, based on the total weight of the coating composition, the coating composition comprises:

[0079] 50-90 wt % of a film-forming resin;

[0080] 4-10 wt % of a cosolvent;

[0081] 5-40 wt % water; and

[0082] 0.1-1 wt% of one of nitrogen-fused ring compounds and aromatic-substituted nitrogen-heterocyclic compounds.

[0083] Further preferably, based on the total weight of the coating composition, the coating composition further comprises 0.1-1 wt % of other additives, wherein the other additives comprise one or more of a defoamer, a leveling agent, a thickener and a wetting agent.

[0084] The coating composition described herein may also be a multi-component, such as a two-component. In an exemplary embodiment, the multi-component coating composition comprises: A) the coating composition described above; B) at least one cross-linking agent. The inventors have found that, in some embodiments, the use of a cross-linking agent can stabilize the improvement in the resistance of the paint film, and even further improve the resistance of the paint film.

[0085] In the coating compositions described herein, the crosslinking agent may preferably be free or substantially free of allergenic substances (eg, aziridine and the like).

[0086] The crosslinking agent may include a compound having -N=C=N- or an epoxy functional group. In some embodiments, the crosslinking agent includes a carbodiimide compound, a silane compound, or a combination thereof. The inventors have found that the use of a combination of two or more crosslinking agents can stabilize the improvement in the resistance of the paint film and even further improve the resistance of the paint film.

[0087] The carbodiimide compound has at least one -N=C=N- structure. Preferably, the carbodiimide compound has two or more carbodiimide groups or a polycarbodiimide compound of a carbodiimide derivative structure in the molecule. More preferably, the carbodiimide compound has three or more carbodiimide groups in the molecule. For example, in some exemplary embodiments, the carbodiimide compound has three to seven carbodiimide groups. The carbodiimide compound may include aliphatic carbodiimide compounds, alicyclic carbodiimide compounds, and aromatic carbodiimide compounds.

[0088] Carbodiimide compounds are water-soluble or water-dispersible. In the absence of particular restrictions, any polycarbodiimide compound that can be stably dissolved or dispersed in an aqueous medium can be used as such a water-soluble or water-dispersible polycarbodiimide compound. Specific examples of water-soluble or water-dispersible polycarbodiimide compounds include CARBODILITE SV-02, CARBODILITE V-02, CARBODILITE V-02-L2, CARBODILITE V-04, CARBODILITE E-01, CARBODILITE E-02, and CARBODILITE E-05 (trade names, purchased from Nisshinbo Industires, Inc.) as polycarbodiimide compounds. The above polycarbodiimide compounds can be used alone or in combination of two or more.

[0089] Carbodiimide compounds can also be synthesized by generally known methods, for example, by decarboxylation condensation reaction of various polyisocyanates using an organic phosphorus compound or an organic metal compound as a catalyst at a temperature of about 70° C. or above in a solvent-free or inert solvent.

[0090] A silane compound may be used as a crosslinking agent. Preferably, the silane compound is an epoxy silane compound. The epoxy equivalent of the epoxy silane compound is in the range of 4 to 6 meq / g.

[0091] In some embodiments, the epoxysilane compound is an epoxysilane oligomer of formula (I):

[0092]

[0093] Wherein R and R1 are independently substituted or unsubstituted alkyl; R2 is independently substituted or unsubstituted linear, branched or cyclic alkyl or alkyl ether residue substituted by epoxide; R3 is hydrogen or substituted or unsubstituted alkyl, and x+y≥2, x≥0.

[0094] In formula (I), preferably, R and R1 are independently C 1-10 Alkyl (e.g., linear or branched), including aryl-substituted alkyl (i.e., arylalkyl). For example, R and R1 are independently methyl or ethyl. In some embodiments, R and R1 are independently substituted or unsubstituted arylalkyl having at least 7 carbon atoms, such as substituted or unsubstituted benzyl.

[0095] R2 is a substituted or unsubstituted straight chain, branched chain or cyclic alkyl group or an alkyl ether residue substituted by an epoxide having less than or equal to 30 carbon atoms.

[0096] R3 is hydrogen or a substituted or unsubstituted alkyl group (straight chain or branched chain, including a cycloalkyl group) or an unsubstituted arylalkyl group.

[0097] The sum of x and y is at least 3.

[0098] For example, useful epoxysilane compounds have the following structure:

[0099]

[0100] Where R is C 1-10 Alkyl (eg, linear or branched), including aryl-substituted alkyl (ie, arylalkyl). For example, R is independently methyl or ethyl.

[0101] Exemplary epoxy silane compounds include, for example, CoatOSil MP 200, which is commercially available.

[0102] The amount of the crosslinking agent can be appropriately adjusted according to the type of crosslinking agent, the film-forming resin, and the desired properties of the paint film. Based on the total weight of the multi-component coating composition, the amount of the crosslinking agent can be about 0.3 wt % to 8 wt %, preferably about 0.5 wt % to 6 wt %, and more preferably about 1 wt % to 5 wt %. For example, based on the total weight of the multi-component coating composition, the amount of the crosslinking agent can be about 1.2 wt %, about 2 wt %, about 3 wt %, or about 4 wt %.

[0103] In some embodiments, the weight ratio of the crosslinker to the nitrogen-containing condensed ring compound or the aromatic-substituted nitrogen heterocyclic compound is 1.1: 1 to 10: 1. Preferably, the weight ratio of the crosslinker to the nitrogen-containing condensed ring compound or the aromatic-substituted nitrogen heterocyclic compound is 1.2: 1 to 8: 1, more preferably 1.5: 1 to 5: 1. For example, the weight ratio of the crosslinker to the nitrogen-containing condensed ring compound or the aromatic-substituted nitrogen heterocyclic compound may be about 2: 1, about 2.5: 1, about 3: 1, about 3.5: 1, or about 4: 1.

[0104] The preparation of the coating composition of the present invention can be achieved by any suitable mixing method known to those of ordinary skill in the art. For example, the coating composition can be made by adding a film-forming resin or emulsion, a cosolvent and an additive to a container, and then stirring the resulting mixture to uniformity. Alternatively, the coating composition can be made by mixing a portion of the additives (e.g., a nitrogen-containing condensed ring compound or an aromatic-substituted nitrogen heterocyclic compound) with a cosolvent, and then adding a film-forming resin or emulsion and the remaining additives to form a uniform mixture. Water can be added during the preparation of the coating composition.

[0105] Aqueous coating composition of the present invention can be applied by conventional methods known to those of ordinary skill in the art. Preferably, the coating composition is applied by brushing, spraying and other coating methods known in the art. In this way, a coating can be formed by the coating composition of the present invention, and this coating also falls within the scope of protection of the present invention. Therefore, the present invention also provides the coating that can be obtained by the coating composition as herein described.

[0106] The coating composition described herein is suitable for use in applications such as wood, metal, plastic, interior and exterior walls, and is particularly suitable for use as a wood coating composition.

[0107] A second aspect of the present application provides a coated article comprising a substrate and the coating composition described herein coated on the substrate or a cured coating formed therefrom.

[0108] The substrate can be selected from one or more of wood, metal, plastic, cement board, interior wall and exterior wall. Examples of suitable substrates include wood, cement, cement fiberboard, wood-plastic composite, tile, metal, plastic, glass and fiberglass. Preferably, coating composition of the present invention is particularly suitable for use on wooden substrates. Suitable wooden substrates include substrates obtained from wooden materials, such as oak (for example white oak and red oak), pine (for example white pine and southern yellow pine), poplar, spruce, cherry, walnut, redwood, cedar, maple, mahogany, birch, hickory, walnut, ash, etc. Preferred wood for wooden substrates includes those woods that are color-developing and easy to UV light discoloration, such as oak, pine, maple, etc. In addition, wooden substrates can be engineered wood products, wherein the substrate is made of wood chips (for example sheets, fragments, flakes, fibers, silk strips).

[0109] Unless stated otherwise, the various features and corresponding preferences described herein may be combined.

[0110] Example

[0111] The disclosure of the present invention is described in more detail by the following examples. These examples are for illustrative purposes only. The embodiments of the present invention are not limited to these specific examples. Unless otherwise stated, all parts, percentages and ratios reported in the following examples are based on weight. Moreover, all reagents used in the examples are commercially available and can be used directly without further treatment. For example, the PCDI in the following examples is commercially available CARBODILITE E-05. Those skilled in the art can easily purchase or prepare the raw materials used in the examples.

[0112] Test Method

[0113] Pencil hardness : The hardness was measured using a pencil hardness tester according to ASTM D3363.

[0114] Chemical resistance (or liquid resistance) : According to GB / T 4893.1, the resistance of the paint film to ethanol, acetic acid, water and hot water is determined using the corresponding test time. The results are evaluated using a grading standard, where 5 = best and 0 = worst.

[0115] Example 1: One-component coating composition

[0116] The components were mixed according to the components and amounts shown in Table 1. STD 1 sample was used as a control and did not contain nitrogen heterocyclic compounds or aromatic nitrogen heterocyclic compound additives. Samples 1, 2 and 3 used the same amount of nitrogen heterocyclic additives, among which TINUVIN 1130 was a benzotriazole compound without an -NH- bond on the heterocyclic ring; 1,2,3-triazole also did not have a fused ring structure containing an -NH- bond.

[0117] Table 1

[0118] Element STD 1 Sample 1 Sample 2 Sample 3 Dow 3311 75 75 75 75 DPM 3 3 3 3 DPnB 3.5 3.5 3.5 3.5 Defoaming agent 1.7 1.7 1.7 1.7 Leveling agent 0.3 0.3 0.3 0.3 Thickener 0.6 0.6 0.6 0.6 Rheology additives 0.14 0.14 0.14 0.14 water 15.76 14.76 14.76 14.76 TINUVIN 1130 / 1 / / Benzotriazole / / 1 / 1,2,3-Triazole / / / 1 total 100g 100g 100g 100g

[0119] After coating on wood, the sample was allowed to dry on the surface, then baked at 40°C for 2 hours, and then dried at room temperature for 7 days. The properties of the paint film were tested. The results are shown in Table 2.

[0120] Table 2

[0121]

[0122] As can be seen from Table 2, the resistance of sample 1 using TINUVIN 1130 to alcohol, acid and water has been improved to a certain extent; the resistance of sample 2 using benzotriazole to alcohol, acid, water and hot water has been significantly improved, and the improvement in hardness, acid resistance and heat resistance is particularly prominent; the acid resistance of sample 3 using 1,2,3-triazole has been improved, but the resistance to alcohol and water has deteriorated. The experimental results show that benzotriazole has significantly improved the performance of the paint film, and is significantly better than TINUVIN 1130 and 1,2,3-triazole in terms of the comprehensive performance of the paint film.

[0123] Example 2: Two-component coating composition

[0124] The coating composition was prepared in a similar manner to Example 1, except that it also contained component B. The components were mixed according to the components and amounts shown in Table 3. STD 2 sample was used as a control and did not contain nitrogen-containing condensed ring compound or aromatic-substituted nitrogen-containing heterocyclic compound additive.

[0125] Table 3

[0126]

[0127]

[0128] After coating on wood, the sample was allowed to dry on the surface, then baked at 40°C for 2 hours, and then dried at room temperature for 7 days. The properties of the paint film were tested. The results are shown in Table 4.

[0129] Table 4

[0130]

[0131] Comparing Table 2 and Table 4, it can be seen that the addition of the crosslinking agent PCDI further improves the performance of the paint film. The results show that the coating formed by the coating composition containing benzotriazole (sample 5) still exhibits significantly better paint film properties, especially significantly improving the water resistance of the paint film.

[0132] It is noteworthy that even compared with the two-component coating composition with the addition of PCDI (control sample STD 2 of Example 2), the paint film with the addition of benzotriazole as a one-component coating composition (sample 2 of Example 1) still exhibits significantly better properties, such as a hardness of grade F and significantly better resistance to alcohol, acid, water and hot water.

[0133] Example 3: Effects of different nitrogen-containing fused ring compounds or aromatic-substituted nitrogen-containing heterocyclic compounds

[0134] A coating composition was prepared in a manner similar to that of Example 1 and Example 2, except that the resin, nitrogen-containing fused ring compound or aromatic nitrogen-containing heterocyclic compound and crosslinking agent shown in Table 5 below were used, wherein "N" means no PCDI was added, and "Y" means 3 g PCDI was added as component B. After coating on the wood, the sample was dried, then baked at 40° C. for 2 hours, and then dried at room temperature for 7 days. The properties of the paint film were tested. The paint film performance results are shown in Table 5.

[0135] Table 5

[0136]

[0137] The results show that benzotriazole, benzimidazole, 2-phenylimidazole and indole can improve the resistance of the paint film. Moreover, after adding PCDI crosslinker, the resistance to alcohol, water and hot water is further improved. The paint film using benzotriazole still shows the best comprehensive chemical resistance.

[0138] Example 4: Using different cross-linking agents

[0139] A coating composition was prepared in a similar manner to Example 3, except that CoatOSil MP 200 epoxy silane compound was used as component B and in the amount shown in Table 6 below. After coating on the wood, the sample was dried, then baked at 40°C for 2 hours, and then dried at room temperature for 7 days. The properties of the paint film were tested. The paint film performance results are shown in Table 6.

[0140] Table 6

[0141]

[0142] The results show that, in the case of samples with benzotriazole added, the addition of epoxy silane compounds as crosslinking agents can further improve the resistance of the paint film to alcohol, water and hot water, and also improve the alkali resistance of the paint film.

[0143] Example 5: Using different film-forming resins

[0144] The coating composition was prepared in a similar manner as in Examples 1-4, except that the film-forming resin shown in Table 7 below was used. After coating on the wood, the sample was allowed to dry on the surface, then baked at 40° C. for 2 hours, and then dried at room temperature for 7 days. The properties of the paint film were tested. The paint film performance results are shown in Table 7.

[0145] Table 7

[0146]

[0147]

[0148] As can be seen from Table 7, the addition of nitrogen-containing fused ring compounds can significantly improve the properties of the paint films of various different film-forming resin systems after curing, especially in terms of alcohol resistance and water resistance. Moreover, in the coating compositions containing different film-forming resins, the combination of the nitrogen-containing fused ring compounds and the crosslinking agent described herein exhibits the best comprehensive chemical resistance.

[0149] The inventors also found through experiments that when the amount of nitrogen-containing condensed ring compounds or aromatic-substituted nitrogen-containing heterocyclic compounds is further increased (greater than 3% by weight), the transparency of the paint film is significantly reduced. In particular, the inventors can distinguish this significant reduction in transparency with the naked eye.

[0150] Although the present invention is described with reference to a large number of embodiments and examples, it is easy for those skilled in the art to see that the present invention can be changed without departing from the principles disclosed in the foregoing description. For example, without departing from the principles disclosed in the foregoing description, a plurality of features or preferred modes described herein are combined, and the resulting technical solutions should be understood to belong to the contents recorded herein. Such changes are deemed to be included in the following claims, unless the claims explicitly indicate otherwise. Accordingly, the embodiments described in detail herein are merely exemplary and are not intended to limit the scope of the present invention, which is the full scope of the attached claims and any and all equivalents thereof.

Claims

1. A multi-component coating composition comprising: A) a coating composition comprising a film-forming resin, a cosolvent and an additive; and B) at least one cross-linking agent, in, The film-forming resin comprises a self-crosslinking agent resin having a side chain containing a ketocarbonyl group, and the additive comprises at least one aza-condensed ring compound having a ring containing an -NH- bond, wherein the aza-condensed ring compound comprises benzotriazole Benzimidazole Indole Purine and phthalimide Any combination of one or more of the following, and the cross-linking agent comprises a compound having -N=C=N- or an epoxy functional group.

2. The multi-component coating composition according to claim 1, wherein the coating composition A) comprises, based on the total weight of the coating composition A): 50-90 wt % of the film-forming resin; 4-10 wt % of the cosolvent; 5-40% by weight of water; 0.1-1 wt% of the aza-fused ring compound; and 0.1-1 wt % of other additives, wherein the other additives include one or more of a defoamer, a leveling agent, a thickener and a wetting agent. 3 . The multi-component coating composition according to claim 1 , wherein the amount of the crosslinking agent is 1 wt % to 5 wt % based on the total weight of the multi-component coating composition.

4. A coated article comprising: A substrate, wherein the substrate is selected from one or more of wood, metal, plastic, cement board, interior wall and exterior wall; and A cured coating formed from the multi-component coating composition according to any one of claims 1 to 3 applied on the substrate.

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