Kit of parts for a curable polyaspartic ester-based coating composition

Abstract

The present invention relates to a kit-of-parts for the preparation of a curable coating composition, preferably a curable clear coating composition, comprising an isocyanate-reactive compound (a) comprising a polyaspartic ester compound in a first container, a polyisocyanate (B) in a second container, and a solvent (S1) selected from the group consisting of monoalcohols and alkoxy monoalcohols in a third container, wherein a UVA and / or HALS additive is optionally comprised in the first and / or third container and a second solvent (S2) is optionally comprised in the second and / or third container. Furthermore, the present invention relates to a coating composition prepared from said kit-of-parts, and a process for the preparation of at least one coating layer on an optionally pre-treated and optionally pre-coated substrate, and a coated substrate obtained thereby.

Description

Field of the invention

[0001] The present invention relates to a kit-of-parts for the preparation of a curable coating composition, preferably a curable clear coating composition, comprising an isocyanate-reactive compound (a) comprising a polyaspartic ester compound in a first container, a polyisocyanate (B) in a second container, and a solvent (S1 ) selected from a mono-alcohol and an alkoxy mono-alcohol in a third container, wherein a UVA and / or HALS additive is optionally comprised in the first and / or third container and a second solvent (S2) is optionally comprised in the second and / or third container. Furthermore, the present invention relates to a coating composition prepared from said kit-of-parts, and a process for the preparation of at least one coating layer on an optionally pre-treated and optionally pre-coated substrate, and a coated substrate obtained thereby. State of the art

[0002] Coating compositions based on isocyanate chemistry are well known in the art and are used in various applications in the coatings industry, for example for primers, basecoats and clearcoats to coat high quality goods, such as automotive original equipment manufacturer (OEM) and automotive refinish. Isocyanate-based coating compositions can include, for example, polyurethane or polyurea coatings formed from resins comprising components such as diisocyanates, polyisocyanates and / or isocyanate reaction products. These resins can be cured by various mechanisms to form covalent bonds between the resin components, resulting in a crosslinked polymer network. Great efforts have been made to develop coating compositions that impart desired properties to the substrate or article to be coated. For example, coatings have been developed for protection against, for example, abrasion, chemicals, corrosion, heat or mechanical impact.

[0003] Polyaspartic ester based polyurea coatings have been very successfully commercialized in the automotive industry, especially in the field of automotive refinish applications, benefiting from the generally lower viscosity of aspartic ester compounds compared to polyols, which are the main reagents of polyurethane coating compositions, and in addition, from the high reactivity of the amino groups of aspartic ester compounds with the isocyanate groups of aliphatic and / or cycloaliphatic polyisocyanates. Thus, polyaspartic ester based coating compositions have the following properties: even at room temperature, they cure faster than polyurethane coating compositions, and they have excellent mechanical strength.

[0004] Aspartate-based coating compositions are known in the art. For example, EP 0403921 describes a coating composition having a binder based on a polyisocyanate component and an isocyanate-reactive component comprising specific secondary polyamines. These secondary polyamines are also called polyaspartic acid derivatives and are based on primary polyamines and maleic or fumaric diesters. EP 0470461 also describes a two-component coating composition for vehicle refinish applications comprising a polyisocyanate component and an isocyanate-reactive secondary diamine prepared from 3,3'-dimethyl 4,4'-diaminodicyclohexylmethane and diethyl maleate. The isocyanate-reactive component further comprises a hydroxyl-functional component consisting of a polyhydroxy polyacrylate or a mixture of polyhydroxy polyacrylate and polyester polyol. EP 0939091 A1 further discloses the addition of a diluent solvent to slow down the reaction or interaction of such coating compositions comprising amine-functional compounds, which usually shortens the pot life during storage, without slowing down the reaction after application of the coating film. WO 2011 / 126562 A1 further discloses a polyurea coating composition comprising the reaction product of a polyaspartic ester component with a mixture of aliphatic and cycloaliphatic isocyanate-functional substances to improve the rate of curing and adhesion to metal substrates. EP 3594300 discloses a high solids or solvent-free aliphatic polyaspartic coating composition formed from an aspartic ester compound and an aliphatic and / or cycloaliphatic polyisocyanate composition, wherein the content of isocyanurate groups, imino groups diazinedione groups, uretdione groups, allophanate groups, biuret groups and / or uretonimine groups in mole-% satisfy a specific relationship.

[0005] However, a general drawback of the above-mentioned aspartate-based two-component coating compositions is that the component containing the curable polyaspartic ester compound significantly discolours due to yellowing upon storage. Thus, coating compositions comprising curable aspartates also tend to discolour or yellow during storage, so that for example the final colour of the resulting coating no longer matches the desired or target colour.

[0006] WO 2004 / 063242 discloses a coating composition comprising an aspartic compound and a polyisocyanate curing agent. The coating composition comprises a disubstituted phenol antioxidant or a hydroperoxide decomposer. The presence of the antioxidant or decomposer tends to give the coating good UV light resistance properties. EP 2829562 A1 also discloses the addition of an antioxidant to a 2K coating composition containing an aspartate-based component to inhibit discoloration / yellowing during storage at room temperature or elevated temperatures, for example 50°C.

[0007] Furthermore, WO 2015 / 13050 A1 discloses discoloration or yellowing of such aspartate-based 2K coating compositions during storage caused by UV absorbers, wherein chain-extended aspartates are proposed as a solution.

[0008] However, to date, no technically simple and satisfactory solution has been provided to avoid this color instability or yellowing of polyurea coatings based on polyaspartic esters during storage, especially at elevated temperatures up to 50°C, or in combination with UV absorbers and other light stabilizers (such as hindered amine light stabilizers) typically included in coating formulations. Furthermore, the scratch resistance of the non-yellowing polyurea coating is improved without negatively impacting its pot life.

[0009] Purpose

[0010] Therefore, the object of the present invention is to provide a low-temperature curing polyurea coating based on polyaspartic ester, particularly a polyaspartic ester-based multi-component coating composition, which can be used as a clear coating in automotive OEM finishing and automotive recoating, and does not discolor or yellow when stored at room temperature (i.e., 23°C) and elevated temperatures (e.g., up to 50°C), especially in the presence of commonly used UV absorbers and / or HALS additives. This is technically easy to achieve without negatively affecting the excellent properties of the polyaspartic ester-based polyurea coating, such as fast curing rate, excellent mechanical strength, and excellent pot life, even at low temperatures.

[0011] Technical solutions

[0012] The above objective is achieved by the subject matter claimed in the claims and the preferred embodiments of that subject matter described below.

[0013] Therefore, the first subject of the present invention is a kit packaging for preparing curable coating compositions, comprising three separate containers C1, C2, and C3, wherein:

[0014] a) Container C1 contains isocyanate reactive component (A), which contains polyaspartic acid ester compound;

[0015] b) Container C2 contains polyisocyanate (B);

[0016] c) Container C3 contains solvent (S1);

[0017] Container C2 and / or container C3, preferably container C3, optionally contain solvent (S2);

[0018] Container C1 and / or container C3, preferably container C3, optionally contain additives (AD);

[0019] The solvent (S1) is characterized in that it is selected from monools and alkoxy monools, preferably alkoxy monools;

[0020] The solvent (S2) is a ketone;

[0021] The additive (AD) is selected from UV absorbers and hindered amine light stabilizers.

[0022] The aforementioned complete packaging is also referred to below as "the complete packaging of the present invention" or "the complete packaging of the present invention", and is therefore the subject of the present invention.

[0023] Another subject of the invention is a coating composition, preferably a transparent coating composition, prepared by mixing at least containers C1, C2 and C3 of the present invention packaged together.

[0024] The above-mentioned coating composition is also referred to below as "the coating composition of the present invention" or "the coating composition of the present invention".

[0025] Another subject of the present invention is to provide a method for preparing at least one coating on a substrate, the method comprising the steps of:

[0026] (1) Optionally, at least one base coat composition is applied to at least a portion of a substrate to form at least one base coat layer;

[0027] (2) Apply the coating composition prepared by the complete packaging of the present invention or the coating composition of the present invention to at least a portion of the substrate or directly to the at least one base coat layer formed in step (1) to form a transparent coating.

[0028] (3) Curing the transparent coating formed in step (2), or co-curing, if present, the at least one base coat formed in step (1) and the transparent coating formed in step (2).

[0029] The above method is also referred to below as "the method of the present invention" or "the method of the present invention".

[0030] Another subject of the present invention is coatings or multilayer effects and / or color coatings prepared according to the method of the present invention, and the use of coating compositions or coating compositions or methods of the present invention prepared in kit form for the preparation of coatings, as coatings, preferably as transparent coatings, preferably for automotive finishing, for repair finishes, for automotive recoating and / or for coating parts installed in or on automobiles, for coating plastic substrates, for commercial vehicles and / or for coating any type of article.

[0031] Preferred embodiments of the present invention will be known from the following description and dependent claims.

[0032] Given the prior art, it is surprising and unexpected to those skilled in the art that the objective upon which this invention is based can be achieved by a technically readily available solution that not only separates the component containing the polyaspartic ester compound from the polyisocyanate (B), as is typically done in two-component coating compositions, but also, in addition, it has been found in this invention that specific solvents (S1) and optional solvents (S2) are other major causes of discoloration or yellowing of the polyaspartic ester-containing component during storage. Furthermore, another source of yellowing of the component containing the polyaspartic ester compound during storage (particularly at elevated temperatures up to 50°C, although less pronounced compared to yellowing observed when solvents (S1) and (S2) are added) has been found to originate from its combination with UVA and HALS additives (typically added in coating compositions for OEM and / or recoating applications).

[0033] Detailed description

[0034] If an official standard is referenced in the context of this invention, it refers to the standard version in circulation on the date of application, or, if no version in circulation exists on that date, the most recent version in circulation, unless otherwise stated.

[0035] In this disclosure (including the claims), unless otherwise stated, all figures representing quantities or characteristics should in all cases be understood to begin and be modified by the term “about.” Therefore, unless otherwise stated, any numerical parameters set forth in the following description may vary depending on the desired properties that one attempts to obtain from the compositions and methods of this disclosure. At least, and not in an attempt to limit the application of the doctrine of equivalence to the scope of the claims, each numerical parameter described in this specification should be interpreted at least based on the reported numerical values ​​of significant figures and by applying conventional rounding techniques.

[0036] Furthermore, any numerical range described herein is intended to include all subranges contained therein. For example, the range “1-10” is intended to include all subranges (inclusive) between the minimum value 1 and the maximum value 10, that is, subranges where the minimum value is equal to or greater than 1 and the maximum value is equal to or less than 10. Any maximum numerical limit described herein is intended to include all lower numerical limits contained therein, and any minimum numerical limit mentioned herein is intended to include all higher numerical limits contained therein.

[0037] Unless otherwise stated, the grammatical articles “a,” “an,” and “described” as used herein are intended to include “at least one” or “one or more.” Therefore, the articles used herein refer to one or more (i.e., at least one) of the grammatical objects of that article. The term “at least one” as used in the context of this invention means that the corresponding compound comprises one or more compounds, preferably consisting of one or more compounds. For example, “solvent (S1)” means one or more solvents (S1), and thus, it is conceivable and possible to use more than one solvent (S1).

[0038] In this invention, the adjective "optional" means that the corresponding compound or component may or may not be present. For example, if "container C2 and / or container C3 optionally contains solvent (S2)", then container C2 and / or container C3 may contain solvent (S2) if solvent (S2) is present, or may not contain solvent (S2) if solvent (S2) is absent.

[0039] In the description of this invention, for convenience, the terms "polymer" and "resin" are used interchangeably to cover resins, oligomers, and polymers.

[0040] The kit-of-parts according to the invention

[0041] The packaged system of the present invention is a multi-component system comprising at least three independent components or containers C1, C2, and C3, wherein the polyaspartic ester compound, containing at least an amino group reactive with the preferred free or unblocked isocyanate functional group of the polyisocyanate, must be stored separately from each other before application, even at room temperature and without additional curing catalyst, to avoid undesirable premature reactions. Surprisingly, in the present invention, it has been found that certain solvents (S1) and (S2) interact with the polyaspartic ester compound, causing undesirable discoloration or yellowing of the component containing the polyaspartic ester compound during storage. Therefore, solvent (S1) and optional solvent (S2) cannot be stored in the same compound or container as the polyaspartic ester compound. Another undesirable reaction between the isocyanate reactive group (i.e., hydroxyl group) of solvent (S1) and the isocyanate functional group of the polyisocyanate (B) leads to a technically simple solution of providing a third container or component containing at least solvent (S1). Since the optional solvent (S2) does not interact with the polyisocyanate prematurely, it may also be stored in the same container or component as the polyisocyanate (B), although it is preferred to store it in the third component with the solvent (S1). Furthermore, additive packages containing UVA and / or HALS additives, typically found in OEM or recoating paint compositions, are another source of discoloration or yellowing of compounds containing polyaspartic acid esters during storage, especially at elevated temperatures up to 50°C, although less pronounced compared to the strong yellowing tendency of the solvents (S1) and (S2) shown herein. For this reason, if present, the UVA and / or HALS additives are preferably included in the third component with the solvent (S1).

[0042] Container C1

[0043] Container C1 contains an isocyanate reactive component (A) comprising at least one polyaspartic ester compound. Therefore, the isocyanate reactive component (A) can represent a crosslinkable resin, oligomer, or polymer responsible for film formation in the coating composition. These resins include functional groups that react with the isocyanate functional groups of a polyisocyanate (B), thereby forming a crosslinked polymer network through various mechanisms.

[0044] Polyaspartic acid ester compounds may also be referred to as polyaspartic acid esters or polyaspartic acid derivatives. These compounds can be prepared according to U.S. Patents 5,821,326, 5,236,741, 6,169,141, 6,911,501, and 7,276,572, the entire disclosure of which is incorporated herein by reference.

[0045] Suitable polyaspartic esters used according to the present invention include those corresponding to formula (I):

[0046] X-[NH-C(COOR 1 )R 3 -C(COOR 2 )R 4 H] n (I)

[0047] Wherein X represents an n-valent organic group that is inert to the isocyanate group at 100°C or lower, preferably a group obtained by removing an amino group from an aliphatic, aryliphatic, or alicyclic polyamine, more preferably a diamine, and more preferably a hydrocarbon group.

[0048] R 1 and R 2 "Same" or "different" indicates an organic group that is inert to the isocyanate group at 100°C or lower, preferably an alkyl group containing 1-9 carbon atoms, more preferably methyl, ethyl, or butyl, or R 1 and R 2 Together with the β-carbon atom, they form alicyclic or heterocyclic rings.

[0049] R 3 Similar to or different from R4, indicating hydrogen or an organic group that is inert to the isocyanate group at 100°C or lower, and

[0050] n represents a value of 2 or greater, preferably 2-6, more preferably 2-4, and most preferably an integer of 2.

[0051] As described in WO2011 / 126562A1, these polyaspartic esters can be prepared by reacting optionally substituted maleate or fumarate with a polyamine. The maleate or fumarate described therein corresponds to a suitable optionally substituted maleate or fumarate of formula (II):

[0052] R 1 OOC-CR 3 =CR 4 -COOR 2 (II)

[0053] Where R 1 R 2 R 3 and R 4 As defined above.

[0054] Examples of optional substituted maleic acid or fumarate esters suitable for the preparation of polyaspartic acid esters include dimethyl, diethyl, and dibutyl (e.g., di-n-butyl) esters of maleic acid and fumarate, and the corresponding maleic acid or fumarate esters substituted with methyl groups at the 2- and / or 3-positions.

[0055] Suitable polyamines for the preparation of polyaspartic esters include those corresponding to formula (III):

[0056] X-(-NH2) n (III)

[0057] X and n are as defined above.

[0058] Polyamines include high molecular weight amines with a molecular weight of 400 to about 10,000, preferably 400 to about 6,000, and low molecular weight amines with a molecular weight below 400. The molecular weight is a number-average molecular weight (Mn), determined by end-group analysis (NH value). Examples of these polyamines are those in which an amino group is attached to an aliphatic, alicyclic, aryliphatic, and / or aromatic carbon atom.

[0059] Suitable low-molecular-weight polyamines include ethylenediamine, 1,2- and 1,3-propanediamine, 2-methyl-1,2-propanediamine, 2,2-dimethyl-1,3-propanediamine, 1,3- and 1,4-butanediamine, 1,3- and 1,5-pentanediamine, 2-methyl-1,5-pentanediamine, 1,6-hexanediamine, 2,5-dimethyl-2,5-hexanediamine, and 2,2,4- and / or 2,4,4-trimethyl-1,6-hexanediamine. 1,7-Heptanediamine, 1,8-Octadiamine, 1,9-Nonanediamine, Triaminononane, 1,10-Decanediamine, 1,11-Undecanediamine, 1,12-Dodecanediamine, 1-Amino-3-Aminomethyl-3,5,5-Trimethylcyclohexane, 2,4-and / or 2,6-Hexahydrotoluenediamine, 2,4'-and / or 4,4'-Diaminodicyclohexylmethane, 3,3'-Dialkyl-4,4'-Diaminobicyclohexane Hexylmethane (e.g., 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane and 3,3'-diethyl-4,4'-diaminodicyclohexylmethane), 1,3- and / or 1,4-cyclohexanediamine, 1,3-bis(methylamino)cyclohexane, 1,8-p-menthidediamine, hydrazine, urea-aminocarboxylic acid hydrazides, dihydrazides, diaminourea, phenylenediamine, 2,4- and 2,6-toluenediamine, 2,3- and 3,4-toluenediamine Amines, 2,4'- and / or 4,4'-diaminodiphenylmethane, more functional polyphenylene polymethylene polyamines obtained by aniline / formaldehyde condensation, N,N,N-tri-(2-aminoethyl)amine, guanidine, melamine, N-(2-aminoethyl)-1,3-propanediamine, 3,3'-diaminobenzidine, polyoxypropylene amine, polyoxyethylamine, 2,4-bis-(4'-aminobenzyl)-aniline, and mixtures thereof.

[0060] Preferred polyamines are 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane (isophorone diamine or IPDA), bis-(4-aminocyclohexyl)methane, bis-(4-amino-3-methylcyclohexyl)methane, 1,6-diaminohexane, 2-methylpentanediamine, ethylenediamine, triaminononamine, 2,4-and / or 2,6-toluenediamine, and 4,4'-and / or 2,4'-diaminodiphenylmethane.

[0061] Suitable high molecular weight polyamines include those made from known polyhydroxy compounds of polyurethane, particularly those prepared from polyethers. Polyamines can be prepared by reacting a polyhydroxy compound with an excess of a polyisocyanate (B), described further below, to form an NCO prepolymer and subsequently hydrolyzing the terminal isocyanate groups to amino groups. Preferably, polyamines are prepared by converting the terminal hydroxyl groups of the polyhydroxy compound to amino groups (e.g., by amination). Preferred high molecular weight polyamines are amine-terminated polyethers, such as those obtained by Huntsman International, LLC. Resin.

[0062] The preparation of polyaspartic ester compounds from the above-mentioned starting materials can be carried out, for example, at a temperature of 0-100°C, using the starting materials such that each primary amino group has at least one, preferably one, olefinic double bond. After the reaction, excess starting material can be removed by distillation. The reaction can be carried out in the absence of a solvent or in the presence of a suitable solvent (e.g., methanol, ethanol, propanol, dimethyl ether). The process is carried out in the case of a mixture of alkane and such solvent. Preferably, the polyaspartic ester compound is solvent-free.

[0063] Preferably, a polyaspartic acid ester compound with a viscosity of about 400-3000 mPa*s at 25°C is used, more preferably about 600-2500 mPa*s, and very preferably about 800-2000 mPa*s.

[0064] In another preferred embodiment, the polyaspartic ester compound has an equivalent of about 200-500, preferably about 210-400, and most preferably about 220-300.

[0065] In another preferred embodiment of the invention, the polyaspartic ester compound has an amine value of about 150-250 mg KOH / g, preferably about 175-225 mg KOH / g, and very preferably about 190-210 mg KOH / g.

[0066] The polyaspartic acid ester compounds that can be used in the disclosed invention are commercially available, for example, from Covestro. Obtained from NH.

[0067] The isocyanate reactive component (A) may also include other compounds (R), such as crosslinkable resins, oligomers, or polymers having isocyanate reactive groups, and different from the polyaspartic acid ester compounds described above. Examples of such other isocyanate reactive oligomers and polymers include (i) poly(meth)acrylates, more particularly hydroxyl-functionalized and / or carboxylate-functionalized and / or amine-functionalized poly(meth)acrylates, (ii) polyurethanes, more particularly hydroxyl-functionalized and / or carboxylate-functionalized and / or amine-functionalized polyurethanes, (iii) polyesters, more particularly polyester polyols and polycarbonate polyols, (iv) polyethers, more particularly polyether polyols, (v) copolymers of the polymers, and (vi) mixtures thereof. The term "poly(meth)acrylate" refers to polyacrylates and polymethacrylates. Thus, poly(meth)acrylates may consist of acrylates and / or methacrylates and may contain other olefinically unsaturated monomers, such as alkyl (meth)acrylates, styrene, or (meth)polyacrylic acid. The term "(meth)acrylamide" in the sense of this invention includes methacrylamide compounds, acrylamide compounds, and mixtures thereof. However, preferably, no other compound (R) is present in container C1 or in containers C1, C2, and / or C3.

[0068] The at least one polyaspartic ester compound is preferably present in a total amount (solid content) of more than about 50% by weight, preferably more than about 65% by weight, more preferably about 80 or 90% by weight to about 100% by weight, in each case based on the total weight of the isocyanate reactive component (A). Most preferably, the isocyanate reactive component (A) consists of a polyaspartic ester compound.

[0069] Using the above-mentioned amount of at least one isocyanate reactive component (A), preferably a polymer resin as part of the base material, ensures the formation of a coating with excellent quality, especially adhesion, recoatability, appearance and low-temperature curing rate.

[0070] In a preferred embodiment of the invention, container C1 comprises less than 10% by weight, preferably less than 5% by weight, more preferably less than 1% by weight, and most preferably contains no or 0% by weight of solvent (S1) and / or solvent (S2), in each case based on the total weight of container C1. Therefore, most preferably, container C1 contains no solvent (S1) and / or solvent (S2).

[0071] In another preferred embodiment of the invention, container C1 contains less than 10% by weight, preferably less than 5% by weight, more preferably less than 1% by weight, and most preferably contains or has no additives (AD) at all, based on the total weight of container C1. Therefore, most preferably, container C1 contains no additives (AD).

[0072] In another preferred embodiment of the invention, container C1 contains less than 10% by weight, preferably less than 5% by weight, more preferably less than 1% by weight, and most preferably contains no or 0% by weight of solvent (S1), solvent (S2), and / or additive (AD), in each case based on the total weight of container C1. Therefore, most preferably, container C1 contains no solvent (S1), solvent (S2), and / or additive (AD).

[0073] In a particularly preferred embodiment of the invention, container C1 comprises, preferably, the following substances: i) an isocyanate reactive component (A) comprising at least one polyaspartic acid ester compound and optional compound (R), preferably comprising at least one polyaspartic acid ester compound and optional compound (R), ii) optional other additives (AD2), and iii) optional solvent (S3).

[0074] Container C2

[0075] Container C2 contains at least one polyisocyanate (B). Advantageously, the polyisocyanate is a hardener or curing agent in a multi-component coating composition, wherein the hardener is one component of the multi-component product that, when mixed with a complementary reactive compound (i.e., a polymeric resin), forms a coating with desired properties through a chemical reaction. The isocyanate functional groups of the polyisocyanate (B) are capable of crosslinking with the complementary isocyanate reactive functional groups of the isocyanate reactive component (A) (e.g., the amino functional groups of polyaspartic ester compounds and optionally the functional groups of other compounds (R)) under suitable reaction conditions, thereby forming a coating or film through crosslinking of the base material. In the presence of other compounds (R), the kit of the present invention may also contain other crosslinking agents that react chemically only with the functional groups of other compounds (R) having isocyanate reactive groups. Thus, the polyisocyanate and the polymeric resin are responsible for film formation and constitute a large portion of the base material. The term "base material," in the sense of this invention and in accordance with DIN EN ISO 4618 (German version, dated March 2007), preferably refers to the curable non-volatile component in the packaged or coating composition of this invention responsible for film formation upon curing, excluding any pigments and fillers contained therein, and more particularly to polyaspartic acid ester compounds and optional other compounds (R) responsible for film formation with polyisocyanate (B). The non-volatile component, obtained by evaporation under specified conditions, in the form of a residue by mass, can be determined by the method described in the Examples section.

[0076] As used herein, the term "polyisocyanate" refers to a compound containing two or more isocyanate groups. The term "diisocyanate" as used herein refers to a compound containing two isocyanate groups. Therefore, diisocyanates are a subset of polyisocyanates.

[0077] Preferably, the isocyanate groups of the polyisocyanate (B) are unblocked, blocked, or a mixture of unblocked and blocked polyisocyanates. Unblocked isocyanate groups may also be referred to as "free" isocyanate groups.

[0078] Unblocked polyisocyanates, i.e. compounds containing at least two free isocyanate groups, are particularly preferred.

[0079] The at least one polyisocyanate (B) may comprise a combination of aliphatic isocyanate functional substances and alicyclic isocyanate functional substances. The aliphatic isocyanate functional substance may include the reaction product of an aliphatic diisocyanate and a hydroxyl-functionalized ether compound. The alicyclic isocyanate functional substance may include the reaction product of an alicyclic diisocyanate and a monofunctional alcohol compound. Both the aliphatic and alicyclic isocyanate functional substances may each comprise at least one substance selected from isocyanates and imino groups. Functional groups of diazine, urea diketone, urethane, biuret, and any combination thereof. Aliphatic and alicyclic isocyanate functionalized substances may be prepared from polyisocyanates with an isocyanate functionality greater than 2 and / or contain polyisocyanates with an isocyanate functionality greater than 2.

[0080] Isocyanurates can be prepared by the cyclic trimerization of polyisocyanates. Trimerization can, for example, be carried out by reacting three (3) equivalents of a polyisocyanate to generate one equivalent of an isocyanurate ring. The three (3) equivalents of the polyisocyanate may include three (3) equivalents of the same polyisocyanate compound, or various mixtures of two (2) or three (3) different polyisocyanate compounds. Compounds such as phosphine, Mannich bases, and tertiary amines such as 1,4-diazabicyclo[2.2.2]octane, dialkylpiperazine, etc., can be used as trimerization catalysts. Imino Diazine can be prepared by the asymmetric cyclic trimerization of polyisocyanates. Urea diketone can be prepared by the dimerization of polyisocyanates. Urea carbamate can be prepared by the reaction of polyisocyanates with urethanes. Biuret can be prepared by adding a small amount of water to two equivalents of polyisocyanate and reacting at a slightly elevated temperature in the presence of a biuret catalyst. Biuret can also be prepared by the reaction of polyisocyanates with urea.

[0081] It can be used to prepare isocyanurates, imino... Diazine, biuret, urea diketone, and urea carbamate, and functionalized substances that can be used to prepare aliphatic and alicyclic isocyanates as crosslinking agents for polymer resins containing at least polyaspartic acid esters, may include aliphatic and alicyclic diisocyanates, such as ethylene diisocyanate; 2,2',5-trimethylhexane diisocyanate; 1,4-tetramethylene diisocyanate; 1,6-hexamethylene diisocyanate (“HDI”); 4,4'-diisocyanate-cyclohexylmethane (“HMDI”); 2,2,4-trimethyl-1,6-hexamethylene diisocyanate; 1,12-dodecyl diisocyanate; 1-isocyanate-3-isocyanate-methyl-3,5,5-trimethylcyclohexane (isophorone diisocyanate or “IPDI”); bis-(4-isocyanate-cyclohexyl)methane (“HMDI”). 12MDI”); bis-(4-isocyanate-3-methylcyclohexyl)methane, 1,1,6,6-tetramethylhexamethylene diisocyanate; p- or m-tetramethylxylenyl diisocyanate; and any combination thereof. The flexibility of the above-mentioned aliphatic and alicyclic polyisocyanates can be improved by chain extension with polyols and / or polyesters, for example, by Asahi Kasei with Durnate TM Commercially available polyols and / or polyester chain extenders of HDI and IPDI. Other polyisocyanates (including various diisocyanates) that can also be used to prepare aliphatic and alicyclic isocyanate functionalized substances may include the polyisocyanates described in U.S. Patents 4,810,820, 5,208,334, 5,124,427, 5,235,018, 5,444,146, and 7,038,003, each of which is incorporated herein by reference in its entirety. Combinations of any and all of the above-mentioned and combined polyisocyanates may also be used to prepare aliphatic and alicyclic isocyanate functionalized substances.

[0082] The polyisocyanate (B) may comprise an aliphatic isocyanate polymer (preferably with an NCO content greater than 15) based on hexamethylene diisocyanate trimer (HDI homopolymer) and / or an aliphatic isocyanate polymer (preferably with an NCO content greater than 10) based on hexamethylene diisocyanate (HDI) as an aliphatic isocyanate functional material.

[0083] In a preferred embodiment of the present invention, the polyisocyanate (B) may comprise, preferably, consist of, a first aliphatic isocyanate functional material having a viscosity of about 80-500 mPa*s at 25°C, preferably about 100-300 mPa*s, a second aliphatic isocyanate functional material having a viscosity of about 500-1500 mPa*s at 25°C, preferably about 800-1300 mPa*s, and an alicyclic isocyanate functional material.

[0084] HDl-based aliphatic isocyanate functionalized materials may include an average isocyanate functionality of at least 4%, a glass transition temperature below -40°C, and / or less than 10% NCO by weight. HDI-based aliphatic isocyanate functionalized materials may be substantially free of HDI isocyanurate trimers.

[0085] The polyisocyanate (B) may contain an IPDl-based alicyclic isocyanate functionalized material with an average isocyanate functionality of at least 2.3, a glass transition temperature of 25-65°C, and / or an NCO% of 10-47% by weight.

[0086] In a preferred embodiment of the invention, the at least one polyisocyanate (B) is present in a total amount of about 1-60% by weight, preferably about 5-50% by weight, more preferably about 10-40% by weight, and very preferably about 15-40% by weight, in each case based on the total weight of the package.

[0087] In another preferred embodiment of the invention, the at least one polyisocyanate (B) comprises at least one, preferably at least two, aliphatic isocyanate functional substances and at least one alicyclic isocyanate functional substance, wherein preferably, the alicyclic isocyanate functional substance is present in a total amount greater than about 50% by weight, preferably greater than about 60% by weight, and very preferably greater than about 70% by weight, in each case based on the total weight of the aliphatic and alicyclic isocyanate functional substances contained in the polyisocyanate (B).

[0088] In a preferred embodiment of the invention, container C2 contains less than 10% by weight, preferably less than 5% by weight, more preferably less than 1% by weight, and most preferably free of or 0% by weight of solvent (S1) and / or additive (AD), in each case based on the total weight of container C2. Therefore, most preferably, container C2 is free of any solvent (S1) and / or additive (AD).

[0089] In another preferred embodiment of the invention, container C2 contains less than 10% by weight, preferably less than 5% by weight, more preferably less than 1% by weight, and most preferably contains no or 0% by weight of solvent (S2), in each case based on the total weight of container C2. Therefore, most preferably, container C2 contains no solvent (S2).

[0090] In another preferred embodiment of the invention, container C2 contains less than 10% by weight, preferably less than 5% by weight, more preferably less than 1% by weight, and most preferably contains no or 0% by weight of solvent (S1), solvent (S2), and / or additive (AD), in each case based on the total weight of container C2. Therefore, most preferably, container C2 contains no solvent (S1), solvent (S2), and / or additive (AD).

[0091] In a particularly preferred embodiment of the invention, container C2 comprises, preferably, the following substances: i) polyisocyanate (B), ii) optional other additives (AD2), and iii) optional solvent (S3).

[0092] Container C3

[0093] Container C3 contains at least one solvent (S1). In the context of this invention and in accordance with DIN ENISO 4618 (English version, date: January 2015), solvent (S1) preferably refers to a single liquid or liquid mixture that is volatile under specified usage conditions and is added to a coating or composition to reduce viscosity or affect other properties. Therefore, solvent (S1) can represent a thinner.

[0094] Container C3 contains at least one solvent (S1) selected from monools and alkoxy monools, preferably alkoxy monools.

[0095] The monools of the present invention are organic compounds having a hydroxyl functional group (OH) bonded to a saturated carbon atom, wherein the saturated carbon atom is part of an alkyl group R. The monools may be represented by the general formula R-OH and include primary (RCH2OH), secondary (R2CHOH), and tertiary (R3COH) alcohols.

[0096] The alkoxy monools of the present invention are organic compounds of the general formula R”-O-R'OH, wherein R' and R” represent alkyl groups. Therefore, alkoxy monools can also be described as organic compounds in which an alkoxy group having the general formula R”-O is bonded to a monool represented by the general formula R'-OH.

[0097] According to the present invention, the alkyl groups R, R', and R" of the general formula representing monools and alkoxy monools are independently derived from aliphatic hydrocarbons of the general formula C. m H 2m+1 Any series of monovalent groups. As used herein, the term "aliphatic" refers to an organic compound characterized by a straight-chain, branched, and / or cyclic chain arrangement with substituted or unsubstituted carbon atoms. Aliphatic compounds do not contain an aromatic ring as part of their molecular structure. As used herein, the term "alicyclic" refers to an organic compound characterized by an arrangement of carbon atoms in a closed ring structure. Alicyclic compounds do not contain an aromatic ring as part of their molecular structure. Therefore, alicyclic compounds are a subset of aliphatic compounds. Therefore, aliphatic compositions may include aliphatic compounds and / or alicyclic compounds.

[0098] In this invention, preferably, the alkyl R, R' and R" of the monool and alkoxy monool are derived from unsubstituted aliphatic hydrocarbons having a straight-chain or branched arrangement of the constituent carbon atoms.

[0099] In this invention, particularly preferred are alkyl R and R' derived from unsubstituted aliphatic hydrocarbon monools and alkoxy monools, having a straight-chain or branched arrangement of carbon atoms, comprising 1 or more, more preferably 2-6, even more preferably 3-4 or most preferably 4 carbon atoms, and alkyl R' derived from unsubstituted aliphatic hydrocarbons, having a straight-chain arrangement of carbon atoms, comprising 1 or more, more preferably 2-6, even more preferably 2-3 or most preferably 2 carbon atoms.

[0100] Non-limiting examples of monools particularly suitable as solvents (S1) according to the present invention include methanol, ethanol, n-propanol and isopropanol, as well as butanol including 1-butanol (n-butanol), 2-butanol (sec-butanol), 2-methylprop-1-ol (isobutanol) and 2-methylpropanol (tert-butanol), particularly preferred are n-propanol and isopropanol, as well as n-butanol, sec-butanol and isobutanol, most preferably isobutanol.

[0101] Non-limiting examples of alkoxy monools particularly suitable as solvents (S1) according to the present invention are glycol ethers, wherein the glycol ethers are a group of organic compounds based on alkyl ethers of ethylene glycol or propylene glycol, an example being 2-butoxyethanol.

[0102] In the most preferred embodiment of the invention, the solvent (S1) is selected from 2-methylprop-1-ol (isobutanol) and 2-butoxyethanol.

[0103] Preferably, the at least one solvent (S1) is present in a total amount of up to 30% by weight, preferably 0.01-20% by weight, and most preferably 0.1-10% by weight, based on the total weight of the package in each case.

[0104] In another preferred embodiment of the invention, the solvent (S1) is present in container C3 in a total amount greater than 80% by weight, preferably greater than 90% by weight, more preferably 95 or 98% by weight to 100% by weight, and most preferably 100% by weight, based in each case on the total weight of the solvent (S1) in the package. Thus, most preferably, the total amount of solvent (S1) is present in the total weight of the package or the package as a whole is contained in container C3.

[0105] In another preferred embodiment of the invention, container C3 comprises, preferably, the following substances: i) solvent (S1), ii) additive (AD), iii) optional solvent (S2), iv) optional solvent (S3), and v) optional additive (AD2).

[0106] Solvent (S2)

[0107] Furthermore, the packaged form of the present invention may contain at least one solvent (S2) in containers C2 and / or C3, wherein solvent (S2) represents a ketone. If present, solvent (S2) is preferably contained in container C3. Solvent (S2), in the sense of the present invention and in accordance with DIN EN ISO 4618 (English version, date: January 2015), preferably refers to a single liquid or mixture of liquids that is volatile and soluble in the base material under specified drying conditions. Solvent (S2) is liquid at room temperature (i.e., 23°C).

[0108] The ketone of the present invention is derived from general formula R a C(=O)R b The indicated organic compound has a functional group, wherein R a and R b These are various carbon-containing substituents that directly bind to the carbonyl C=O (carbon-oxygen double bond), including symmetrical (substituent R) groups. a and R b Same) and asymmetric ketones (substituent R) a and R b (Different or not identical). Preferably, the ketone of the present invention is asymmetric.

[0109] Preferably, the carbon-containing substituent R of the present invention a and R b It is an alkyl group. The alkyl group R of the present invention... a or R b It is a general formula derived from aliphatic hydrocarbons, C p H 2p+1 Any monovalent group series. Therefore, alkyl R a and R b It is a saturated group. As used herein, the term "aliphatic" refers to an organic compound characterized by a straight-chain, branched, and / or cyclic chain arrangement with substituted or unsubstituted carbon atoms. Aliphatic compounds do not contain an aromatic ring as part of their molecular structure. As used herein, the term "alicyclic" refers to an organic compound characterized by an arrangement of carbon atoms in a closed ring structure. Alicyclic compounds do not contain an aromatic ring as part of their molecular structure. Therefore, alicyclic compounds are a subset of aliphatic compounds. Therefore, aliphatic compositions may include aliphatic compounds and / or alicyclic compounds.

[0110] In this invention, preferably, alkyl R a and R b The general formula C is derived from unsubstituted aliphatic hydrocarbons. p H 2p+1 Any series of monovalent groups that have a straight-chain or branched arrangement that makes up carbon atoms.

[0111] In this invention, alkyl R is particularly preferred. a and R bEach of the above is a general formula C derived independently from unsubstituted aliphatic hydrocarbons. p H 2p+1 Any series of monovalent groups having a straight-chain or branched arrangement of constituent carbon atoms, wherein R a and / or R b It is an alkyl group containing one or more, more preferably one to five, or even more preferably one or five carbon atoms. p H 2p+1 .

[0112] In this invention, alkyl R is particularly preferred. a and R b Each of the above is a general formula C derived independently from unsubstituted aliphatic hydrocarbons. p H 2p+1 Any series of monovalent groups having a straight-chain or branched arrangement of constituent carbon atoms, wherein R a and / or R b For alkyl C atoms containing one or more, more preferably one to five, or even more preferably one or five carbon atoms p H 2p+1 .

[0113] In another preferred embodiment of the invention, the ketone of the invention is asymmetric and has the functional group R. a and R b , where R a and R b Each of the above is a general formula C derived independently from unsubstituted aliphatic hydrocarbons. p H 2p+1 Any series of monovalent groups having a straight-chain or branched arrangement of constituent carbon atoms, wherein R a and / or R b For alkyl C atoms containing one or more, more preferably one to five, or even more preferably one or five carbon atoms m H 2m+1 .

[0114] In another preferred embodiment of the invention, the solvent (S2) is selected from general formula R. a C(=O)R b The asymmetric ketone is represented by R. a and R b Not the same alkyl group directly bonded to the carbonyl C=O (carbon-oxygen double bond), where R a (or R) b ) is a general formula derived from unsubstituted aliphatic hydrocarbons: C p H 2p+1 Any series of monovalent groups having a straight chain arrangement of carbon atoms comprising 1-4, preferably 1-3, more preferably 1 or 2, and most preferably 1 carbon atom, wherein R b (or separately, R)a () is a general formula derived from unsubstituted aliphatic hydrocarbons. p H 2p+1 Any series of monovalent groups having a straight or branched arrangement of constituent carbon atoms comprising 1 to 6, preferably 3 to 6, more preferably 4 or 5 to 6, and most preferably 5 carbon atoms, preferably a branched arrangement.

[0115] Therefore, according to the present invention, a non-limiting example of a ketone suitable as a solvent (S2) is selected from the general formula R. a C(=O)R b The asymmetric ketone is represented by R. a The substituent is selected from methyl, ethyl, n-propyl, and isopropyl, as well as butyl (including n-butyl, butyl-2-(sec-butyl), 2-methylpropyl(isobutyl), and tert-butyl), with methyl being particularly preferred, and R 4 The substituents are selected from methyl, ethyl, n-propyl and isopropyl, pentyl (including n-pentyl, 2-methylbut-2-yl (tert-pentyl), 2,2-dimethylpropyl (neopentyl), 3-methylbutyl (isopentyl)), pent-2-yl (secondary pentyl), pent-3-yl (3-pentyl), 3-methylbut-2-yl (secondary isopentyl) and 2-methylbutyl (active pentyl)), and hexyl (including n-hexyl, isohexyl, tert-hexyl and neohexyl), with n-pentyl, 2-methylbut-2-yl (tert-pentyl), 2,2-dimethylpropyl (neopentyl) and 3-methylbutyl (isopentyl) being particularly preferred.

[0116] In the most preferred embodiment of the present invention, the solvent (S2) is 5-methylhexane-2-one (MIAK).

[0117] If the solvent (S2) is completely contained in the package, then the at least one solvent (S2) is preferably present in a total amount of up to 30%, preferably up to 20%, and very preferably up to 10%, based on the total weight of the package in each case.

[0118] In another preferred embodiment of the invention, the solvent (S2) is present in containers C2 and / or C3 in a total amount greater than 80% by weight, preferably greater than 90% by weight, more preferably 95 or 98% by weight to 100% by weight, and most preferably 100% by weight, preferably in container C3, in each case based on the total weight (S2) of the solvent in the kit. Thus, most preferably, the total amount of solvent (S2) is present in the total weight of the kit or the kit is contained entirely in containers C2 and / or C3, preferably in container C3.

[0119] In another preferred embodiment of the invention, container C1 and / or container C2 contain less than 5% by weight, preferably less than 1% by weight, and very preferably no or 0% by weight of solvent (S2), in each case based on the total weight of container C1 and / or container C2. Most preferably, container C1 or container C2 contains no or no solvent (S2).

[0120] Therefore, another preferred embodiment of the present invention is a kit for preparing a curable coating composition, comprising three separate containers C1, C2, and C3, wherein:

[0121] a) Container C1 contains isocyanate reactive component (A), which contains a polyaspartic ester compound.

[0122] b) Container C2 contains polyisocyanate (B);

[0123] c) Container C3 contains solvent (S1);

[0124] Container C2 and / or container C3, preferably container C3, contain solvent (S2);

[0125] Container C1 and / or container C3, preferably container C3, optionally contain additives (AD);

[0126] The solvent (S1) is characterized in that it is selected from monools and alkoxy monools, preferably alkoxy monools;

[0127] The solvent (S2) is a ketone;

[0128] The additive (AD) is selected from UV absorbers and hindered amine light stabilizers.

[0129] Solvent (S3)

[0130] Furthermore, the complete packaging of the present invention may also contain in any one of containers C1, C2 and / or C3 at least one other solvent (S3) selected from the categories of "solvent", "diluent" and "thinner", which is different from the solvents (S1) and solvents (S2) commonly used in solvent-based coating compositions, such as butyl acetate, 1-methoxy-2-propyl acetate (MPA), toluene, xylene, solvent naphtha, Solvesso 100 or (Originally from APAL), esters, such as ethyl acetate, butyl acetate, amyl acetate or ethyl ethoxypropionate, amides, methyl acetal, butyral, 1,3-diethyl ester. Alkanes, formaldehyde glycerol, hydrocarbons, and mixtures thereof. Preferred organic solvents (S3) are esters, most preferably n-butyl acetate and / or 1-methoxypropyl acetate and / or 2-butoxyethyl acetate.

[0131] The term "diluent," in the sense of this invention and in accordance with DIN EN ISO 4618 (English version, date: January 2015), preferably refers to a single or mixed volatile liquid that, although not a "solvent" soluble in the base material, can be used with a "solvent" soluble in the base material without producing any harmful effects. The terms "diluent" and "solvent" of this invention have been further defined in the Solvent (S1) and Solvent (S2) sections above.

[0132] Solvent (S1), solvent (S2), and solvent (S3) are different from each other, or in other words, they are different compounds.

[0133] Additives (AD)

[0134] The containers C1 and / or C3 (preferably container C3) of the complete packaging of the present invention may contain one or more additives (AD) selected from UV absorbers (UVA) and / or hindered amine light stabilizers (HALS).

[0135] UV absorbers (UVA) are generally organic molecules capable of absorbing harmful UV light and converting it into harmless heat. They may include UV absorbers selected from 2-(2-hydroxyphenyl)benzotriazoles (BTZ), 2-hydroxybenzophenones (BP), hydroxyphenyl-s-triazines (HPT), and oxalyl diphenylamines, or mixtures thereof. The UVA suitable for the kits used in this invention is any commercially available UVA known to those skilled in the art for use in polymers and paints, for example, described in VALET Andreas, BRAIG Adalbert, Light Stabilizers for Coatings, Hannover: Vincentz Network, 2017, 2nd revision, pp. 23-35, the entire disclosure of which is incorporated herein by reference. UV absorbers that can be used in the disclosed invention are commercially available, for example, from BASF. Acquired through commercial purchase.

[0136] Preferably, UVA is selected from the 2-(2-hydroxyphenyl)-benzotriazole (BTZ) class of UV absorbers. Examples of this preferred UV absorber (UVA) include, but are not limited to, those listed below. 384.

[0137] Hindered amine light stabilizers (HALS) are sterically hindered amines used to stabilize commercially available polymers, most commonly derivatives of 2,2,6,6-tetramethylpiperidine. The HALS used in the kits of this invention are all commercially available HALS known to those skilled in the art for use in polymers and paints, for example, as described in VALET Andreas, BRAIG Adalbert, Light Stabilizers for Coatings, Hannover: Vincentz Network, 2017, 2nd revision, pp. 36-45, the entire disclosure of which is incorporated herein by reference. HALS that can be used in the disclosed invention are commercially available, for example from BASF. Acquired through commercial purchase.

[0138] Preferred HALS include, but are not limited to, 123. 144 and 292, all of which can be purchased from BASF.

[0139] In a particularly preferred embodiment of the invention, the additive (AD) is selected from UVA and / or HALS, wherein UVA is 2-(2-hydroxyphenyl)-benzotriazole and HALS is a mixture of bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate and methyl(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate.

[0140] If present, the at least one additive (AD) is preferably included in a total amount of 0.001-10% by weight, more preferably in a total amount of 0.01-5% by weight, and very preferably in a total amount of 0.1-1% by weight, in each case based on the total amount in the package.

[0141] In another preferred embodiment of the invention, if present, the additive (AD) is contained in containers C1 and / or container C3, preferably in container C3, in a total amount greater than 80% by weight, preferably greater than 90% by weight, more preferably 95% by weight or 98% by weight to 100% by weight, and most preferably 100% by weight, based on the total weight of the additive (AD) in the package in each case. Therefore, most preferably, if present, the total weight of the additive (AD) or the entire package is contained in containers C1 and / or container C3, preferably in container C3.

[0142] In another preferred embodiment of the invention, container C2 contains less than 5% by weight, preferably less than 1% by weight, very preferably no or 0% by weight of additives (AD), in each case based on the total weight of container C2. Most preferably, container C2 does not contain additives (AD).

[0143] Therefore, another preferred embodiment of the present invention is a kit for preparing a curable coating composition, comprising three separate containers C1, C2, and C3, wherein:

[0144] a) Container C1 contains isocyanate reactive component (A), which contains polyaspartic acid ester compound;

[0145] b) Container C2 contains polyisocyanate (B);

[0146] c) Container C3 contains solvent (S1);

[0147] Container C2 and / or container C3, preferably container C3, optionally contain solvent (S2);

[0148] Container C1 and / or container C3, preferably container C3, contain additive (AD);

[0149] The solvent (S1) is characterized in that it is selected from monools and alkoxy monools, preferably alkoxy monools;

[0150] The solvent (S2) is a ketone;

[0151] The additive (AD) is selected from UV absorbers and hindered amine light stabilizers.

[0152] Another preferred embodiment of the present invention is a kit for preparing a curable coating composition, comprising three separate containers C1, C2, and C3, wherein:

[0153] a) Container C1 contains isocyanate reactive component (A), which contains polyaspartic acid ester compound;

[0154] b) Container C2 contains polyisocyanate (B);

[0155] c) Container C3 contains solvent (S1);

[0156] Container C2 and / or container C3, preferably container C3, contain solvent (S2);

[0157] Container C1 and / or container C3, preferably container C3, contain additive (AD);

[0158] The solvent (S1) is characterized in that it is selected from monools and alkoxy monools, preferably alkoxy monools;

[0159] The solvent (S2) is a ketone;

[0160] The additive (AD) is selected from UV absorbers and hindered amine light stabilizers.

[0161] Another preferred embodiment of the present invention is a kit for preparing a curable coating composition, comprising three separate containers C1, C2, and C3, wherein:

[0162] a) Container C1 contains isocyanate reactive component (A), which contains polyaspartic acid ester compound;

[0163] b) Container C2 contains polyisocyanate (B);

[0164] c) Container C3 contains solvent (S1);

[0165] Container C3 contains solvent (S2);

[0166] Container C3 contains additives (AD);

[0167] The solvent (S1) is characterized in that it is selected from monools and alkoxy monools, preferably alkoxy monools;

[0168] The solvent (S2) is a ketone;

[0169] The additive (AD) is selected from UV absorbers and hindered amine light stabilizers.

[0170] Other additives (AD2)

[0171] Furthermore, the complete packaging of the present invention may contain at least one other additive (AD2) typically included in the coating composition, preferably in the clear coating composition, in any one of containers C1, C2, and / or C3. Additive (AD2) is different from additive (AD). Examples of additive (AD2) are as follows:

[0172] - Smoothing additives

[0173] -A nanoparticle dispersion of surface-treated silica

[0174] - Antioxidants, such as sterically hindered phenolic antioxidants and organophosphate antioxidants,

[0175] -Polymerization inhibitor,

[0176] - Defoamer,

[0177] - Wetting agents, such as siloxanes, fluorinated compounds, monocarboxylic acid esters, phosphate esters, polyacrylic acid and its copolymers or polyurethanes;

[0178] - Tackifiers, such as tricyclodecanediethanol,

[0179] - Flow regulator,

[0180] - Film-forming aids, such as cellulose derivatives

[0181] - Fillers, such as silica, alumina, or zirconium oxide-based nanoparticles; see further details. Lexikon "Lacke and Druckfarben" Georg Thieme Verlag, Stuttgart, 1998, pp. 250-252,

[0182] - Rheology modifiers, such as those known from patents WO 94 / 22968, EP-A-0 276 501, EP-A-0 249 201 or WO 97 / 12945; crosslinked polymer microparticles, such as those disclosed in EP-A-0 008 127; inorganic styrene silicates, such as montmorillonite-type magnesium aluminum silicate, magnesium sodium styrene silicate, and lithium magnesium fluoride sodium styrene silicate; silica, such as... Or synthetic polymers containing ionic and / or associative groups, such as polyvinyl alcohol, poly(meth)acrylamide, poly(methacrylic acid), polyvinylpyrrolidone, styrene-maleic anhydride copolymers or ethylene-maleic anhydride copolymers and their derivatives, or hydrophobically modified ethoxylated carbamates or polyacrylates.

[0183] - Flame retardants, and / or

[0184] -Water cleaner,

[0185] - Solidified catalyst,

[0186] -pigment.

[0187] According to the invention, it may be advantageous to include at least one additive (AD2) selected from the curing catalyst in any of the containers C1, C2, and / or C3. The curing catalyst is primarily used to catalyze the reaction between the functional groups of the polyisocyanate (B) and the complementary reactive functional groups of the at least one isocyanate reactive component (A), such as a polyaspartic acid ester-based compound or other compound (R). The at least one catalyst is preferably selected from bismuth carboxylate, lithium carboxylate, tin carboxylate, tin thiolate, zirconium chelate, aluminum chelate, zinc complex, zinc carboxylate, tertiary amines, and mixtures thereof, more preferably from tin carboxylate, and very preferably from dioctyltin dilaurate and / or 1,4-diazabicyclo[2.2.2]octane.

[0188] Furthermore, according to the invention, it may be advantageous that the kit of the invention contains, preferably in container C1, at least one additive (AD2) selected from a dispersion of surface-treated silica nanoparticles in container C1. The dispersion of surface-treated silica nanoparticles can be commercially available, for example, from BYK Additives & Instruments as NanoBYK, specifically NanoBYK 3650 and 3652. Preferably, the additive (AD2) selected from the surface-treated silica nanoparticle dispersion is present in a total amount of 0.5-5.0% by weight, more preferably 0.9-4.5% by weight, and even more preferably 1.5-3.0% by weight, in each case based on the total amount in the kit of the invention.

[0189] Preferably, the complete package of the present invention does not contain additional antioxidants or antioxidant components containing sterically hindered phenolic antioxidants and / or organophosphate antioxidants.

[0190] In another preferred embodiment of the invention, the package does not contain any hydroperoxide decomposer.

[0191] The at least one additive (AD2) is preferably present in a total amount of up to 30% by weight, very preferably up to 20% by weight, in each case based on the total amount of the packaged product of the present invention.

[0192] The kit of this invention can also be used to prepare base coats, top coats, or primers. Therefore, the kit of this invention may contain pigments, including effect pigments and optional fillers.

[0193] Non-limiting examples of effect pigments that can be used in basecoat and topcoat paint compositions include metallic, pearlescent, and color-changing flake pigments. Metallic (including pearlescent and color-changing) topcoat colors are produced using one or more special flake pigments. Metallic basecoat colors can be produced using metallic flake pigments, such as aluminum flake pigments, coated aluminum flake pigments, copper flake pigments, zinc flake pigments, stainless steel flake pigments, and bronze flake pigments, and / or using pearlescent flake pigments (including treated mica, such as titanium dioxide-coated mica pigments and iron oxide-coated mica pigments), thereby giving the coating a different appearance (reflectivity or color) when viewed from different angles. The metallic flakes can be cornflake-shaped, lens-shaped, or anti-cyclic; the mica can be natural, synthetic, or alumina-type. Flake pigments do not agglomerate or pulverize under high shear, as high shear would cause the flakes or their crystal morphology to break or bend, reducing or destroying the angle-dependent color-changing effect. By stirring under low shear, the flake pigments are satisfactorily dispersed in the base component. Flake pigments may be included in coating compositions in amounts of about 0.01 to about 50% by weight or about 15 to about 25% by weight, in each case based on the total weight of the binder. Non-limiting examples of commercially available flake pigments include those obtained by BASF Corporation. pigment.

[0194] Non-limiting examples of other suitable pigments and fillers that can be used in basecoat and single-coat topcoat compositions include inorganic pigments such as titanium dioxide, barium sulfate, carbon black, ochre, loess, brown clay, hematite, limonite, iron oxide red, transparent iron oxide red, iron oxide black, iron oxide brown, chromium oxide green, strontium chromate, zinc phosphate, silica such as fumed silica, calcium carbonate, talc, barite, ferric ammonium ferrocyanide (Prussian blue), and ultramarine, and organic pigments such as metallized and non-metallized azo red, quinacridone red and violet, perylene red, copper phthalocyanine blue and green, carbazole violet, monoaryl and diaryl yellow, benzimidazolone yellow, toluene orange, naphthol orange, and nanoparticles based on silica, alumina, or zirconium oxide. According to known methods, it is preferable to disperse the pigments in a resin or polymer, or with a pigment dispersant (e.g., the base resin type described). Typically, pigments and dispersing resins, polymers, or dispersants are contacted under sufficiently high shear forces to break up pigment agglomerates into primary pigment particles and wet the surface of the pigment particles with the dispersing resin, polymer, or dispersant. The breaking up of agglomerates and the wetting of primary pigment particles are crucial for pigment stability and color development. Based on the total weight of the coating composition, pigments and fillers are typically used in amounts of up to about 60% by weight. The amount of pigment used depends on the characteristics of the pigment, its color concentration and / or the intensity of the effect it is intended to produce, and the dispersibility of the pigment in the colored coating composition. The pigment content is preferably 0.5-50% by weight, more preferably 1-30% by weight, very preferably 2-20% by weight, and more particularly 2.5-10% by weight, in each case based on the total weight of the colored coating composition.

[0195] In a particularly preferred embodiment of the invention, the kit of the invention can also be used to prepare transparent tinted topcoat compositions (tinted transparent coatings) and pigment-free transparent coating compositions. Therefore, the kit of the invention may also contain glass sheets required for preparing transparent tinted topcoat compositions. The glass sheets are preferably present in an amount of 0.001-0.8% by weight, based on the total weight of the coating composition. This tinted transparent coating is more frequently used to expand the palette of decorative effects, which can be achieved when coating vehicles or other surfaces with a coating (preferably multiple coatings).

[0196] The coating composition according to the invention prepared from the kit-of-parts according to the invention

[0197] The coating compositions of the present invention are multi-component products, wherein the term "multi-component product" describes coatings or coating compositions supplied in two or more separate components or containers, which must be mixed in proportions specified by the manufacturer before use.

[0198] Typically, the polymer resin and hardener or curing agent of this multi-component product are mixed together only shortly before application. The term "shortly before application" is well known to those skilled in the art. The timeframe during which a ready-to-use coating composition can be prepared by mixing the components before actual application depends on the pot life of the coating application.

[0199] The coating composition of the present invention is prepared by mixing at least three independent containers C1, C2, and C3 of the kit packaged in this manner. The coating composition prepared in this way is ready for application.

[0200] Preferably, the coating composition of the present invention prepared by the complete packaging of the present invention is a transparent coating composition.

[0201] In some embodiments of the invention, a coating composition can be prepared by mixing a container C1 containing an isocyanate reactive component (A) (which contains at least one polyaspartic ester compound, preferably composed of a polyaspartic ester compound) and a container C2 containing a polyisocyanate (B) in an NH:NCO ratio of about 0.5:10 to 10:0.5, in some embodiments about 0.5:5 to 5:0.5, in some embodiments about 0.5:3 to 3:0.5, in some embodiments about 0.5:1.5 to 1.5:0.5, and in some embodiments 1:1, with a NH:NCO ratio of 1. If the isocyanate reactive component (A) contains other compounds (R) with isocyanate reactive groups such as OH groups in addition to the polyaspartic acid ester compound, those skilled in the art can adjust the amount of NH functional groups in the polyaspartic acid ester compound according to the additional isocyanate reactive functional groups (e.g., OH groups) of the other compounds (R) to meet the above-mentioned NH and other isocyanate reactive groups:NCO ratio.

[0202] In another preferred embodiment of the invention, the coating composition can be prepared by mixing containers C1, C2 and C3 in a volume ratio v / v / v of about 100:90:5 to 100:110:50, preferably about 100:100:20 to 100:100:40, using the kit packaging of the invention.

[0203] Mixing can be performed manually, in which a suitable amount of the first component a) is introduced into the container and mixed with corresponding amounts of the second component B), the third component C), and optional other components. However, mixing of three or more components can also be performed automatically by an automated mixing system. This automated mixing system may include a mixing unit, more particularly a static mixer, and at least three devices for supplying the isocyanate reactive component (A), the second component (B) containing the polyisocyanate, and the solvent (S1), more particularly gear pumps and / or pressure valves. The static mixer may be a commercially available spiral mixer installed on the material supply line approximately 50-100 cm in front of the atomizer. Preferably, 12-18 mixing elements (each element being 1 cm in length and 6-8 mm in diameter) are used to achieve thorough mixing of the three components. To prevent blockage of the material supply line, the mixing unit is preferably programmed such that not only the spiral mixer, but also the downstream hose line and the atomizer are flushed with the first component every 7-17 minutes. In the case of applying the composition using a robot, the flushing operation is performed when the robot head is in a predefined stationary position. Depending on the length of the hose, approximately 50-200 ml is discarded into the collection container. A preferred alternative to this procedure is semi-continuous delivery of the mixed release agent composition. If the composition is drained periodically (every 7-17 minutes, also into the collection container), the amount of waste material can be minimized (approximately 10-50 ml). Furthermore, the hose from the mixer to the atomizer, as well as the atomizer itself, can be flushed. This flushing operation is particularly preferred after prolonged system downtime or at the end of a shift to ensure long equipment life and consistent composition quality.

[0204] In the case of manual mixing and in the case of supplying components for automatic mixing, each component preferably has a temperature of 15-70°C, more preferably 15-40°C, and even more particularly 20-30°C.

[0205] The coating composition of the present invention is a film-forming composition and is suitable for use as a clear coating, base coat, top coat, or primer. Therefore, the coating composition of the present invention may contain pigments, including effect pigments, glass flakes, and optional fillers.

[0206] Particularly preferred embodiments of the coating compositions of the present invention are in the form of transparent colored topcoat coating compositions (colored transparent coatings) and pigment-free transparent coating compositions.

[0207] The contents described in relation to the complete packaging of the present invention are compared with other preferred embodiments applicable to the coating compositions of the present invention, especially preferred embodiments comprising at least one polyaspartic ester compound and optional other compounds (R) of an isocyanate reactive component (A), a polyisocyanate (B), a solvent (S1), an additive (AD), and optional components such as solvent (S2), solvent (S3), and additive (AD2) (including dispersions of surface-treated silica nanoparticles and / or catalysts).

[0208] The method according to the invention for producing at least one coating, selected from a multi-layer coating, on a substrate

[0209] The coating composition prepared by the complete packaging of the present invention or the coating composition of the present invention is preferably used as a transparent coating composition in a method for preparing a coating (preferably a multilayer coating) on ​​a substrate.

[0210] Therefore, a third aspect of the present invention is a method for preparing at least one coating on a substrate, the method comprising the following steps:

[0211] Step (1): Optionally, at least one base coat composition is applied to at least a portion of the substrate (S) to form at least one base coat layer;

[0212] Step (2): Apply the coating composition prepared by the complete packaging of the present invention or the coating composition of the present invention to at least a portion of the substrate to be coated, or apply it directly to the at least one base coat layer formed in step (1) to form a coating, preferably a transparent coating;

[0213] Step (3): Curing the coating formed in step (2), or co-curing, if present, the at least one base coat formed in step (1) and the coating formed in step (2).

[0214] Step (1):

[0215] In optional step (1) of the coating method of the present invention, a base coat composition is applied to at least a portion of a substrate (S) to form a base coat layer. The coating is preferably formed by flash evaporation of the applied paint composition. This means the active or passive evaporation of volatile organic compounds (e.g., thinners, diluents, and solvents present in the composition), typically at a temperature of, for example, 5-120°C, preferably 5-45°C or 15-25°C, for a period of 30 seconds to 30 minutes at a relative humidity of about 10-100%, preferably about 40-70%. The composition remains fluid immediately after application and at the start of flash evaporation, thus allowing for the formation of a uniform, smooth coating during the flash evaporation phase. However, the layer obtained from the paint composition after flash evaporation is not yet ready for use. For example, although it is no longer fluid, it may still be soft or sticky and may have only undergone partial drying. This may also refer to the non-stick drying time. In particular, as described below, the layer obtained from the paint composition is not yet cured.

[0216] Step (2):

[0217] In step (2) of the coating method of the present invention, the coating composition prepared by the kit of the present invention as described above, or the coating composition of the present invention, is applied to at least a portion of the substrate (S), or, if a base coat composition was applied to at least a portion of the substrate (S) in step (1), it is preferably applied directly to at least a partially dried base coat layer to form a coating, preferably a transparent coating. The coating is preferably formed as described above for the base coat layer, preferably by flash evaporation of the coating composition prepared by the kit of the present invention, or the coating composition of the present invention. This means active or passive evaporation of volatile organic compounds (e.g., thinners, diluents, and solvents present in the composition), typically at a temperature of, for example, 5-120°C, preferably 5-45°C or 15-25°C, at a relative humidity of about 10-100%, preferably about 40-70%, for a period of 30 seconds to 30 minutes (dust-free drying time). The composition remains fluid immediately after application and at the start of flash evaporation, thus allowing a uniform, smooth coating film to be formed during the flash evaporation stage. However, the layer obtained from the coating composition after flash drying is not yet ready for use. For example, although it is no longer flowing, it may still be soft or sticky, and may have only undergone partial drying. In particular, as described below, the layer obtained from the coating composition is not yet cured.

[0218] Preferably, if the base coat composition is applied in step (1), the application of the coating composition prepared by the kit of the present invention or the coating composition of the present invention in step (2) is performed in a wet-on-wet manner. The wet-on-wet application technique is known to those skilled in the art, and it refers to the technique of applying another coating composition before the previous coating composition is completely dry or cured, and then drying the composite film as a whole.

[0219] In an alternative embodiment, the base coat may also be dried and cured before applying the coating composition prepared by the kit of the present invention or the coating composition of the present invention.

[0220] Step (3):

[0221] In step (3) of the method of the present invention, in a first alternative, the coating composition applied in step (2) is cured, or in a second alternative, the coating composition applied in steps (1) and (2) is co-cured. This refers to converting these coating compositions and polymer materials into a ready-to-use state, meaning that the components comprising the cured composition and polymer material are in a state where they can be used and transported as intended. Thus, the cured composition and polymer material are no longer soft or sticky, but are respectively adjusted to a solid coating film, a solid polymer material, or a solid component. Even with further exposure to crosslinking conditions, the properties of the film or material or component (such as hardness or adhesion) no longer exhibit any substantial change.

[0222] For the compositions applied in steps (1) and / or (2), curing is carried out by chemical curing. In the context of this invention, "chemically curable" and the term "chemically cured" refer to the crosslinking (formation of a cured composition) of the composition initiated by a chemical reaction of the functional groups of the isocyanate reactive compound (A), the polyisocyanate (B), and optionally other reactive compounds. When a composition labeled as chemically curable is cured, there will always be some physical curing, which refers to the intercyclication of polymer chains. Physical curing may even be predominant. However, such a composition is called chemically curable if it contains at least a proportionate film-forming component of chemical curability. Curing can be accelerated by a catalyst (e.g., a curing catalyst). Curing can also be further accelerated by energy activation of the chemical reaction by thermal energy or photochemical radiation, in addition to the addition of a catalyst, wherein the term "photochemical curing" refers to curing the composition by using electromagnetic radiation (e.g., electron beam, NIR, or UV radiation). Thus, a film is a continuous layer of the applied coating composition or coating, and film formation is achieved by drying and / or hardening the applied coating composition or coating from a liquid to a solid state. These two transitions can occur simultaneously. Therefore, the process of at least partial drying (flash evaporation) of the optionally applied base coat in step (1) and the process of at least partial drying (flash evaporation) of the coating composition of the present invention in step (2) can overlap with or proceed concurrently with the (chemical) curing in step (3). In particular, if no additional energy activation, such as thermal energy (which is preferred), is provided in step (3), a rapid transition from partial drying to curing (dust-free drying time) may not be observed. Both processes occur simultaneously.

[0223] Preferably, the curing or co-curing in step (3) is carried out at a temperature of about 5-120°C, preferably about 5-45°C or about 15-25°C, for 30-90 minutes, preferably 50-80 minutes, at a relative humidity of about 10-100%, preferably about 40-70%.

[0224] It should be understood that the total time from the application of the coating according to optional steps (1) and (2) to the end of step (3) with a ready-to-use or cured coating can be or is within the range of the sum of the flash time disclosed for optional steps (1) and (2) and the curing time for step (3).

[0225] The substrate preferably used in the method of the present invention can be selected from metal substrates, plastic substrates, and substrates comprising both plastic and metal parts. Suitable metal substrates are selected from aluminum substrates, copper substrates, zinc substrates, magnesium substrates, and substrates composed of alloys of these metals, as well as steel parts. The term "plastic substrate" refers to a substrate composed of polymeric materials. Polymeric materials suitable for plastic substrates are selected from (i) polar plastics, such as polycarbonate, polyamide, polystyrene, styrene copolymers, polyesters, polyphenylene ethers, and blends of these plastics, (ii) synthetic resins, such as polyurethane RIM, SMC, BMC, ABS, and (iii) polyolefin substrates of the polyethylene and polypropylene types with high rubber content, such as PP-EPDM and surface-activated polyolefin substrates. Substrates composed of various of the above-mentioned materials can also be coated, or already coated substrates can be coated, such as vehicles, aircraft, or ships and their parts, especially body or externally mounted parts. Thus, the substrate can be a metal or plastic substrate optionally pretreated with a base coat or preferably a multilayer coating with defects.

[0226] If desired, the coating composition can be applied directly to the substrate according to optional steps (1) and (2)—without sanding, and optionally after simple cleaning—to form one or more base coat layers and / or one or more clear coats. Preferably, no first two coats of mixed primer are applied to the substrate coated according to the invention; instead, the base coat composition and / or topcoat composition, more particularly the clear coat composition, are applied directly to the substrate (S). The base coat materials that can be used are, in principle, all base coat materials conventionally used for OEM finishing or recoating, including water-based and solvent-based base coats. Such base coat materials are available, for example, from BASF Coatics GmbH.

[0227] The coating composition according to the method of the present invention is applied using methods known and conventional in coating technology for applying liquid coatings, such as spraying, scraping, curtain coating, vacuum coating, roller coating, pouring, dipping, spin coating, suction coating, brushing, or jetting, or by printing techniques such as screen printing, gravure printing, flexographic printing, offset printing, and pad printing. Spraying methods are preferred, such as compressed air spraying (pneumatic application), airless spraying, high-speed rotation, electrostatic spraying (ESTA), optionally combined with thermal spraying, such as hot air (thermal spraying). Very particularly preferred is that the coating composition of the present invention is applied by pneumatic spraying or electrostatic spraying. The coating composition of the present invention is applied such that the coating preferably has a dry film thickness of 5-100 μm, preferably 30-60 μm.

[0228] The contents described regarding the complete packaging and coating composition of the present invention are compared with other preferred embodiments applicable to the coating method of the present invention.

[0229] The coated substrate according to the invention

[0230] The result of the coating method of the present invention is that the substrate (S) is coated with a coating or multilayer effect and / or color coating obtained by the coating composition prepared by the complete package of the present invention or the coating composition of the present invention.

[0231] The coating compositions prepared by the complete packaging of this invention, or the coating compositions of this invention, or the methods of this invention for preparing coatings or multilayer coatings on substrates, or the coated substrates obtained by the methods of this invention, can be used in many fields. Examples include use for automotive finishing, trim repair, automotive recoating and / or coating of parts installed in or on automobiles, plastic substrates or commercial vehicles and / or coating of any type of article.

[0232] The contents described regarding the complete packaging, coating composition, and method of the present invention are applicable to other preferred embodiments of the coated components of the present invention. Example

[0233] The invention will now be described in more detail using working examples. However, these working examples are intended to illustrate the invention and should not be construed as limiting the scope of the invention. Those skilled in the art will understand that variations of the examples are possible within the scope of the invention as defined only by the claims. Hereinafter, unless otherwise stated, the terms “parts,” “%,” and “ratio” in the examples refer to “parts by mass,” “% by weight,” and “mass ratio,” respectively.

[0234] Determination methods

[0235] Solids (solids, non-volatile content)

[0236] Non-volatile matter was determined according to ASTM D2369 (dated: 2015). In this procedure, 2 g of sample was weighed into a pre-dried aluminum pan, dried in a drying oven at 110°C for 60 minutes, cooled in a desiccator, and then weighed again. The residue, relative to the total amount of sample introduced, corresponds to the non-volatile matter.

[0237] Determination of number average and weight average molecular weight

[0238] Number-average molecular weight (Mn) was determined by gel permeation chromatography (GPC) according to DIN 55672-1 (March 2016). In addition to number-average molecular weight, this method can also be used to determine weight-average molecular weight (Mw) and polydispersity d (weight-average molecular weight (Mw) versus number-average molecular weight (Mn)). n The ratio of ) to ). Tetrahydrofuran was used as the eluent. The determination was performed relative to a polystyrene standard. The column material consisted of a styrene-divinylbenzene copolymer.

[0239] Yellowing

[0240] As an indicator of yellowing, the APHA color of a sample is determined by spectrophotometry according to DIN EN ISO 6271:2015 and expressed in Platinum / Cobalt units (Pt / Co units). Values ​​exceeding 100 are considered unacceptable.

[0241] Scratch resistance after polishing

[0242] As an indicator of scratch resistance after polishing, in the method of this invention, the sample of the coating to be tested is applied in a wet-on-wet manner. In the first step, a commercially available black water-based base coat is applied to a Bonder metal plate (coated with a commercially available cathodic electrophoretic coating and a commercially available conventional solvent-based first and second coat primer) with a dry film thickness of 16 μm ± 2 μm using a gravity feed cup gun, and the base coat layer is dried for 15 minutes at a temperature of 21°C ± 2°C and a relative humidity of 50% ± 10% (dust-free drying time). In the second step, the coating to be tested is applied to the previously applied base coat layer from the first step with a dry film thickness of approximately 40 μm ± 5 μm using a gravity feed cup gun. After 90 minutes at a temperature of 21°C ± 2°C and a relative humidity of 50% ± 10%, the drying of the coating to be tested and the curing of the multilayer coating formed by the base coat layer and the coating to be tested are completed.

[0243] After storing at ambient temperature for 2 hours, the sanded area was applied to the cured transparent coating plate (using an eccentric compressed air vibratory sander from 3M, 10,000 rpm, sanding disc: 3M Finesse-it Trizact 50079). Subsequently, the sanded area was polished with polishing paste in a coarse polishing step (rotary polishing operation 800-1000 rpm, paste: 3M 50417 rapid cutting with sanding paste, polishing pad: 3M 50487 green polishing foam) and a finer polishing step (rotary polishing operation 1200-1500 rpm, paste: 3M 80349 Perfect-it ultrafine with polishing paste, polishing pad: 3M 50488 yellow polishing foam). After removing the polishing compound with a microfiber cloth, visually inspect the appearance of scratches and gloss retention on the polished surface, and classify them according to the criteria from 3 (unacceptable, scratches with a length greater than or equal to 3.0 cm are visible to the naked eye at a distance of 50 cm) to 1 (acceptable, no visual scratches or scratches with a length less than 0.5 cm are visible to the naked eye at a distance of 50 cm).

[0244] Pot life

[0245] The pot life is defined as the time it takes for the kinematic viscosity of the test sample to flow in a DIN 4mm cup (DIN 53211) at 23°C for more than 24 seconds. A pot life of at least 28 minutes is acceptable.

[0246] Materials

[0247] NH 1420, a polyaspartic acid ester prepared from bis-(4-aminocyclohexyl)-methane (amine value 195-205), was obtained from Covestro AG, Germany.

[0248] N3600, an aliphatic isocyanate polymer based on hexamethylene diisocyanate trimer (HDI homopolymer) (NCO content 23.0, viscosity at 25°C 1100 mPas*s, equivalent 183, 100% solids content), Covestro, Germany.

[0249] Z4470MPA / X, an aliphatic polyisocyanate based on isophorone diisocyanate trimer (IPDI trimer) (NCO content 11.9, viscosity at 25°C 1500 mPas*s, equivalent 360, 70% solids content in 1-methoxy-2-propyl acetate / xylene 1:1), Covestro, Germany.

[0250] Tolonate TMX FLO 100, an aliphatic isocyanate polymer based on hexamethylene diisocyanate (HDI) (NCO content 12.3±1.0%, viscosity at 25°C 140±80 mPas*s, equivalent 341, 100% solids content), Vencorex, France.

[0251] 384, Liquid UV Absorber (UVA), Chemical Structure: 95% phenylpropionic acid, 3-(2H-benzotriazol-2-yl)-5-(1,1-dimethylethyl)-4-hydroxy-, C7-9 branched and straight-chain alkyl ester, 5% 1-methoxy-2-propyl acetate, BASF SE, Germany.

[0252] 292, Liquid Hindered Amine Light Stabilizer (HALS), chemical structure: a) bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate and b) methyl(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, BASF SE, Germany.

[0253] BYK 302, polyether-modified polydimethylsiloxane, Byk Chemie GmbH, Germany.

[0254] NanoBYK 3650, a dispersion of surface-treated silica nanoparticles, Byk Chemie GmbH, Germany.

[0255] The solvent, n-butyl acetate, is commercially available from BASF SE (Germany), Oxea GmbH (Germany), or Ineos.

[0256] The solvent 5-methylhexane-2-one (MIAK) is commercially available from Eastman.

[0257] The solvent 2-methylprop-1-ol (isobutanol) is commercially available from BASF SE (Germany), Oxea GmbH (Germany), Ineos, or Sasol.

[0258] The solvent 2-butoxyethanol-1-ol is commercially available from BASF SE, Ineos, Dow or Sasol in Germany.

[0259] The solvent 1-methoxy-2-propyl acetate (MPA) is available from BASF SE (Germany), Shell, or Dow (USA).

[0260] The solvent 4-methylpentan-2-one (MIBK) is commercially available from Arkema, Celanese (USA), Dow (USA), Eastman, Sasol, or Shell.

[0261] The solvent xylene is commercially available from Total, Arsol or Raffenerie Heide.

[0262] 1. Preparation of a component containing polyaspartic acid ester, UVA and / or HALS additives.

[0263] The coating composition consists of polyaspartic acid esters. NH 1420 is formulated in combination with typical UVA and / or HALS additives, as shown in Table 1.

[0264] Table 1

[0265]

[0266] The color stability of the components containing polyaspartic acid esters and UVA and / or HALS additives was monitored by measuring the APHA color immediately after mixing (t=0) and after storage at 50°C for 1, 2 and 3 weeks.

[0267] The results in Table 1 clearly show that, compared to formulation (1A), which exhibits very slow APHA color growth, formulation (1B), which contains no UVA or HALS additives or other solvents, shows significantly slower APHA color growth. 292 is used as an example HALS additive (formulation 1B) to add 384, as an exemplary UVA additive (Formulation 1C), or a combination of HALS and UVA additives as a typical UVA / HALS package (Formulation 1D), resulted in a significant increase in APHA color over time. For formulations containing HALS additives, the yellowing reached 100 after 3 weeks of storage at 50°C, which is just acceptable. Therefore, 384 will be used as an exemplary UVA / HALS additive. 292 and / or Adding 384 to the same component containing polyaspartic acid esters can cause yellowing during storage.

[0268] 2. Preparation of a component comprising polyaspartic acid ester, UVA and HALS additives, and a selected organic solvent.

[0269] Polyaspartic acid ester The components of coating compositions formulated with NH 1420 in combination with typical UVA and HALS additives and selected solvents are shown in Table 2.

[0270] Table 2

[0271]

[0272] The APHA color was determined immediately after mixing (t=0) and after storage at 50°C for 1, 2 and 3 weeks, to monitor the color stability of the components containing polyaspartic acid ester, UVA and HALS additives and specific solvents.

[0273] The results in Table 2 show that the APHA color of the components increased significantly within one week after the addition of hydroxyl-containing organic solvents 2-methylprop-1-ol (formulation 2F) and 2-butoxyethanol-1-ol (formulation 2G). However, the addition of organic solvents without free hydroxyl groups, such as 1-methoxy-2-propyl acetate, 4-methylpentan-2-one, and xylene (formulation 2H-2J), showed a slow increase in APHA color. After storage at 50°C for 3 weeks, the increase in APHA color, an indicator of yellowing, was still acceptable.

[0274] Therefore, as examples of monools and alkoxy monools with hydroxyl functional groups, 2-methylprop-1-ol and 2-butoxyethyl-1-ol, when combined with polyaspartic acid esters and UVA / HALS packaging, result in severe yellowing during storage.

[0275] 3. A multi-component coating composition was prepared from three separately prepared components (A), (B), and (C).

[0276] The three separately prepared components (A), (B), and (C) of the multi-component coating composition of the present invention were formulated, wherein component (C) contains sufficient amounts of UVA additive, HALS additive, and 2-butoxyethanol-1-ol, which is an exemplary alkoxy monool in the whole multi-component coating composition. Furthermore, the non-coloring coating composition of the present invention was prepared by thoroughly mixing and homogenizing the separately prepared components (A), (B), and (C) at a volume ratio of 100 parts A + 100 parts B + 10 parts C v / v / v, as shown in Table 3.

[0277] Table 3

[0278]

[0279] The color of APHA was measured immediately after mixing the components (t=0) and after storage at 50°C for 1, 2 and 3 weeks, to monitor the color stability of the three individual components A, B and C.

[0280] The results in Table 3 show that component A, which contains polyaspartic acid ester and n-butyl acetate as an organic solvent (which does not contain free hydroxyl groups or ketones), exhibits very stable and low APHA color. A similar situation exists for component B, which contains a combination of three isocyanate-containing compounds and n-butyl acetate. After storage at 50°C for 3 weeks, the third component C, which contains UVA and HALS additives and 2-butoxyethanol-1-ol (as an example alkoxy monool), shows only a slight and insignificant increase in APHA color of 20 points.

[0281] A multi-component non-colored coating composition V1 was prepared by thoroughly mixing three individual components (A), (B), and (C). Direct (t=0) measurement of the APHA color showed a low value of 40, the same as the initial APHA color value measured directly after mixing the components of formulation 2E-2J. After mixing the components, the pot life at room temperature (23°C) was approximately 37 minutes, making further measurement of the APHA color impossible.

[0282] 4. A multi-component coating composition comprising three separately prepared components (A), (B), and (C), wherein an additive (AD2) is included in a dispersion of surface-treated silica nanoparticles.

[0283] In another set of experiments, as described in Table 3 of Section 3 above, a multi-component coating composition for coating V1 was prepared, wherein, in addition to the given formulation for coating V1 described above, an additive (AD2) selected from a dispersion of surface-treated silica nanoparticles (NanoByk 3650) was added to component (A) at total weights of 0%, 2%, 4%, and 10%, respectively, based on the total weight of component (A) in each case. Therefore, the additive (AD2) selected from a dispersion of surface-treated silica nanoparticles was added at total weights of 0%, 0.9%, 1.9%, and 4.5%, respectively, based on the total weight of the coating composition in each case. Thus, other coating compositions V2, V3, and V4 of the present invention were prepared, as shown in Table 4.

[0284] Table 4

[0285]

[0286] Immediately after mixing the components, the pot life of the coating compositions V1 to V4 was determined using the method described above. The results in Table 4 show that as the amount of surface-treated nanoparticle dispersion (NanoBYK 3650) added increased, the pot life decreased from 37 minutes (coating V1, 0%) to an unacceptable 15 minutes (coating V4, 10%), passing through an still acceptable 29 minutes (coating V3, 4%).

[0287] The scratch resistance of the coatings V1 to V4 applied according to the present invention after polishing was determined by the above method. The results in Table 4 show that the scratch resistance after polishing increases with the increase of the amount of surface-treated nanoparticle dispersion (NanoBYK 3650) added to the coating formulation.

[0288] Furthermore, the gloss retention rate of coating V3 after 6 weeks of reflow was determined at a 20° angle according to DIN 55654:2015-08, using 2μm and 9μm sandpaper obtained from 3M, with scratches applied by a linear abrasion tester (friction gauge). Good gloss retention values ​​of 68% and 67% were obtained.

[0289] The coating composition V3 of the present invention, which contains 4% by weight of a surface-treated nanoparticle dispersion (NanoBYK 3650), achieves an optimal balance between acceptable pot life requirements and high scratch resistance after polishing.

Claims

1. A complete package for preparing a curable coating composition, comprising three separate containers C1, C2, and C3, wherein: a) Container C1 contains isocyanate reactive component (A), which contains polyaspartic acid ester compound; b) Container C2 contains polyisocyanate (B); c) Container C3 contains solvent (S1); Containers C2 and / or C3 may optionally contain solvent (S2); Containers C1 and / or C3 may optionally contain additives (AD); The solvent (S1) is characterized in that it is selected from monools and alkoxy monools; The solvent (S2) is a ketone; The additive (AD) is selected from UV absorbers and hindered amine light stabilizers.

2. The complete package according to claim 1, wherein container C3 optionally contains solvent (S2).

3. The complete package according to claim 1, wherein container C3 optionally contains additives (AD).

4. The complete package according to claim 1, wherein the solvent (S1) is selected from alkoxy monools.

5. The complete package according to claim 1, wherein container C1 contains less than 10% by weight of solvent (S1), solvent (S2) and / or additive (AD) in each case based on the total weight of container C1.

6. The package according to claim 1, wherein container C1 contains less than 5% by weight of solvent (S1), solvent (S2) and / or additive (AD) in each case based on the total weight of container C1.

7. The complete package according to claim 1, wherein the container C1 contains less than 1% by weight of solvent (S1), solvent (S2) and / or additive (AD) in each case based on the total weight of container C1.

8. The complete package according to claim 1, wherein container C1 is free of solvent (S1), solvent (S2) and / or additive (AD), based on the total weight of container C1 in each case.

9. The complete package according to any one of claims 1-8, wherein the monool is selected from methanol, ethanol, n-propanol and isopropanol, and butanol, including 1-butanol (n-butanol), 2-n-butanol (sec-butanol), 2-methylprop-1-ol (isobutanol) and 2-methylpropanol (tert-butanol).

10. The complete package according to claim 9, wherein the monool is selected from isobutanol.

11. The package according to any one of claims 1-8, wherein the alkoxy monool is selected from glycol ethers.

12. The complete package according to claim 11, wherein the alkoxy monool is selected from 2-butoxyethanol.

13. The complete package according to any one of claims 1-8, wherein the solvent (S2) is made of general formula R a C(=O)R b The asymmetric ketone is represented by R. a and R b These are different alkyl groups that are directly bonded to the carbonyl C=O group, where R a The general formula C is derived from unsubstituted aliphatic hydrocarbons. p H 2p+1 Any series of monovalent groups having a straight chain arrangement of constituent carbon atoms comprising 1-4 carbon atoms, wherein R b The general formula C is derived from unsubstituted aliphatic hydrocarbons. p H 2p+1 Any series of monovalent groups having a straight or branched arrangement of constituent carbon atoms comprising 1 to 6 carbon atoms.

14. The complete package according to any one of claims 1-8, wherein the solvent (S2) is 5-methylhexane-2-one.

15. The kit according to any one of claims 1-8, wherein the total amount of additives (AD) selected from UV absorbers and hindered amine light stabilizers is contained in container C3 based on the total weight of the additives (AD) in the kit.

16. The package according to any one of claims 1-8, wherein the polyaspartic ester compound has an equivalent of 200-500.

17. The package according to claim 16, wherein the polyaspartic ester compound has an equivalent of 210-400.

18. The package according to claim 16, wherein the polyaspartic ester compound has an equivalent of 220-300.

19. The package according to any one of claims 1-8, wherein any one of containers C1, C2 and / or C3 contains an additive (AD2) selected from a dispersion of surface-treated silica nanoparticles.

20. The kit according to claim 19, wherein container C1 contains an additive (AD2) selected from a dispersion of surface-treated silica nanoparticles.

21. The package according to any one of claims 1-8, wherein the polyisocyanate (B) comprises at least one aliphatic isocyanate functional substance and at least one alicyclic isocyanate functional substance, wherein the alicyclic isocyanate functional substance is present in a total amount greater than 50% by weight, based in each case on the total weight of the aliphatic and alicyclic isocyanate functional substances contained in the polyisocyanate (B).

22. The package according to claim 21, wherein the polyisocyanate (B) comprises at least two aliphatic isocyanate functional substances and at least one alicyclic isocyanate functional substance, wherein the alicyclic isocyanate functional substance is present in a total amount greater than 70% by weight, in each case based on the total weight of the aliphatic and alicyclic isocyanate functional substances contained in the polyisocyanate (B).

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