Polyaspartic acid composition

Abstract

The present invention relates to a coating preparation composition containing at least one polyaspartic acid ester compound, at least one isocyanate compound, and optionally at least one additive.

Description

[Technical field]

[0001] The present invention relates to a composition for preparing a coating comprising a polyaspartic ester and an isocyanate compound.

[0002] The present invention also relates to methods for preparing such compositions, as well as the use of such compositions as protective coatings.

[0003] The present invention also relates to protective coatings comprising the polyaspartic acid compositions.

[0004] In particular, the present invention relates to compositions for preparing coatings having improved flexibility and improved pot life of paint or varnish formulations, the viscosity of which is reduced. [Background technology]

[0005] Coatings containing polyaspartic esters are used primarily for their rapid crosslinking, resistance to abrasion and corrosion, and / or their use in high solids content formulations.

[0006] As an example of these compositions comprising polyaspartic esters, we can cite EP 0573860, which describes compositions comprising a polyisocyanate, a polyaspartic ester and a catalyst. WO 202016292 describes another type of composition comprising at least one polyaspartic ester, at least one isocyanate prepolymer and a catalyst.

[0007] Generally speaking, compositions containing polyaspartic esters have a very short pot life and are very inflexible (elongation at break less than 50%). In addition, some of these polyaspartic acid compositions contain solvents or catalysts that can cause other problems.

[0008] Pot life times are generally improved by: Use a solvent in the composition containing the polyaspartic acid ester that makes it possible to reduce the viscosity of the composition and its crosslinking rate. Generally uses small amounts (less than 30% by weight) of low-viscosity reactive diluents

[0009] The use of a small amount of a solvent or reactive diluent can solve the problem of short pot life, but cannot improve the flexibility of the composition containing the polyaspartic acid ester.

[0010] To solve this particular problem of flexibility, elastomeric isocyanate prepolymer compounds are often added to polyaspartic acid compositions. These isocyanate prepolymers generally have a low NCO content (less than 13%) and a high viscosity (greater than 1500 mPa·s), which limits their application possibilities.

[0011] As a result, these polyaspartic acid compositions generally contain significant amounts of solvents to reduce or control their viscosity and / or improve their pot life, and these solvents are usually volatile organic compounds (VOCs) or sources of such VOCs.

[0012] Furthermore, the addition of catalysts has proven problematic in terms of toxicity to the health of handlers or to the environment.

[0013] Therefore, there is a need to find new isocyanate-based polyaspartic acid compositions that are solvent or catalyst free, flexible (elongation at break greater than 50%), and have low viscosity of the isocyanate moiety (less than 1500 mPa·s).

[0014] The invention therefore provides a composition for preparing coatings which are particularly advantageous in the field of ground coverings or wind power.

[0015] The invention makes it possible to provide a solution to various problems associated with compositions for preparing coatings in the state of the art, in particular problems associated with application difficulties when the composition is too viscous, but also problems associated with the ductility of the coating when it is not sufficiently flexible. [Prior art documents] [Patent documents]

[0016] [Patent Document 1] European Patent No. 0573860 [Patent Document 2] International Publication No. 202016292 Summary of the Invention

[0017] The present invention relates to a composition for preparing coatings with improved elongation, the isocyanate moiety of which has an NCO content of more than 13% and an acceptable viscosity, i.e. less than 1500 mPa·s at 25° C. Improved elongation properties are understood to mean an elongation at break of more than 50%.

[0018] In particular, the present invention relates to a composition for preparing a coating, comprising: at least one polyaspartic acid ester compound (a), at least one isocyanate compound (b), - optionally at least one additive (c).

[0019] The present invention more particularly relates to a composition for preparing a coating, the isocyanate compound (b) being at least one allophanate (b1), and at least one polyfunctional isocyanate (b2), the mass ratio (b1) / (b2) being from 50 / 50 to 99 / 1.

[0020] Preferentially, the mass ratio (b1) / (b2) is between 55 / 45 and 95 / 5. Even more preferentially, the mass ratio (b1) / (b2) is between 60 / 40 and 95 / 5.

[0021] The molar ratio between mixtures (b) and (a) is defined by the number of NCO functional groups of (b) and the number of NH functional groups of (a). The ratio of (b) to (a) is between 0.7 and 1.3, preferentially between 0.8 and 1.2, more preferentially between 0.9 and 1.1, or even more preferentially equal to 1. The NCO functionality of compound (b) is equal to the sum of the NCO functionalities of compounds (b1) and (b2).

[0022] The polyaspartic ester (a) preferably has an NH group content of between 2% and 8%, more preferentially between 3% and 7%.

[0023] The polyaspartic acid ester (a) preferably has a viscosity in the range of 500 to 4000 mPa·s.

[0024] The polyaspartic esters (a) according to the invention can be obtained by Michael reaction of a system comprising a polyamine and an ester, the ester being preferably a maleate or a fumarate or a mixture thereof.

[0025] According to the present invention, the term "polyamine" refers to a compound that contains at least two primary and / or secondary free amine groups. The term "polyamine" also includes polymers that contain at least two pendant and / or terminal amine-containing groups.

[0026] The reaction for preparing the polyaspartic acid ester (a) can be carried out without a solvent or in the presence of a suitable solvent, which is preferably one or more alcohols, ethers, acetates, ketones or mixtures thereof.

[0027] The alcohol used as the solvent can be, for example, methanol, ethanol, butyl glycol and propanol.

[0028] The acetate used as the solvent is preferably n-butyl acetate.

[0029] The ketone used as the solvent is preferably a methyl ethyl ketone dialkane.

[0030] The polyaspartic acid ester (a) preferably has the general formula (I): Polyaspartic acid ester according to JPEG2024520347000001.jpg6999, wherein -X represents an aliphatic chain or a polyether chain; R1 and R2 are each independently an organic group that is inert to an isocyanate group at standard atmospheric pressure (about 100 Pa) and at or below 100°C; -n represents an integer of 2 or greater.

[0031] Preferably, R1 and R2 are, independently of one another, an alkyl residue having from 1 to 10 carbon atoms, and more preferentially, R1 and R2 are, independently of one another, selected from a methyl, ethyl or butyl group.

[0032] n is preferably an integer of 2 to 4, and more preferably 2.

[0033] Preferably, in general formula (I), X consists of one or more of the following residues: a polyether residue, a linear alkyl residue, a branched alkyl residue and a cycloalkyl residue.

[0034] In general formula (I), when n=2, the polyaspartic acid ester (a) is prepared by reacting a polyamine of formula (Ia) with a maleate and / or a fumarate of formula (Ib). JPEG2024520347000002.jpg35119

[0035] The polyamines of formula (Ia) are preferably ethylenediamine, 1,2-diaminopropane, 1,4-diaminobutane, 1,3-diaminopentane, 1,6-diaminohexane, 2,5-diamino-2,5-dimethylhexane, 1,6-diaminohexane, 2,2,4-trimethyl-1,6-diaminohexane, 2,4,4-trimethyl-1,6-diaminohexane, 1,11-diaminoundecane, 1,12-diaminododecane, 1,3-cyclohexanediamine and and 1,4-cyclohexanediamine, amino-3,3,5-trimethyl-5-aminomethylcyclohexane, 2,4-hexahydrotoluenediamine, 2,6-hexahydrotoluenediamine, 2,4'-diaminodicyclohexylmethane, 4,4'-diaminodicyclohexylmethane, 3,3'-dialkyl-4,4'-diaminodicyclohexylmethane, 2,4,4'-triamino-5-methyldicyclohexylmethane, 2-methyl-1,5-pentanediamine , 1,3-xylylenediamine and 1,4-xylylenediamine, more preferably 1,4-aminobutane, 1,6-diaminohexane, 2,2,4-trimethyl-1,6-diaminohexane, 2,4,4-trimethyl-1,6-diaminohexane, amino-3,3,5-trimethyl-5-aminomethylcyclohexane, 4,4'-diamino-dicyclohexylmethane, 3,3'-dialkyl-4,4'-diaminodicyclohexylmethane, 2-methyl-1 ,5-pentanediamine, and even more preferably 2-methyl-1,5-pentanediamine, amino-3,3,5-trimethyl-5-aminomethylcyclohexane, 2,4'-diamino-dicyclohexylmethane, 4,4'-diamino-dicyclohexylmethane, and 3,3'-dialkyl-4,4'-diaminodicyclohexylmethane, polyether polyamines having a functionality of 2 and a number average molar mass (Mn) of less than 1000 g / mol.

[0036] The maleate and / or fumarate salts of formula (Ib) are preferably selected from dimethyl maleate, diethyl maleate, dibutyl maleate, dimethyl fumarate, diethyl fumarate and dibutyl fumarate.

[0037] The molar ratio between the maleate and / or fumarate (Ib) and the polyamine (Ia) is preferably 2:1.

[0038] The molar ratio between the olefinic double bonds of the maleate and / or fumarate (Ib) and the primary amine groups of the polyamine (Ia) is preferably 1:1.

[0039] The product obtained from the reaction of (Ia) with (Ib) is preferably purified by distillation to obtain the polyaspartic acid ester (a).

[0040] Reactants (Ia) and (Ib) may or may not contain a solvent, and preferably do contain a solvent.

[0041] The solvent is preferably one or more of the following solvents: methanol, ethanol, propanol and / or dioxane.

[0042] The polyaspartic acid ester (a) of the general formula (I) is - of general formula (II) and / or JPEG2024520347000003.jpg87169-General formula (III) and / or JPEG2024520347000004.jpg56123-General formula (IV) and / or JPEG2024520347000005.jpg53123 -General formula (V) JPEG2024520347000006.jpg77162, in which the R1 and R2 groups are each independently one of C1 to C 10 It is an alkyl group, and u is an integer of 1-10.

[0043] Preferentially, u is an integer from 2 to 6, and even more preferentially, u is an integer from 2 to 4.

[0044] Preferably, in the general formulae (II), (III), (IV) and (V), the R1 and R2 groups are, independently of one another, one or more methyl, ethyl or butyl groups, preferably R1 and R2 are ethyl groups.

[0045] The polyaspartic acid ester (a) is more preferably selected from the compounds which react with isocyanates described in U.S. Pat. Nos. 512617, 523674, 5489704, 5243012, 5736604, 6458293, 6833424, 7169876 or U.S. Patent Application Publication No. 2006 / 0247371.

[0046] The polyaspartic acid ester (a) is even more preferably selected from tetraethyl N,N'-(methylenedicyclohexane-4,1-diyl)bis-DL-aspartate, tetraethyl N,N'-(methylenebis(2-methyl-cyclohexane-4,1-diyl)bis-DL-aspartate, or tetraethyl N,N'-(2-methylpentane)bis-DL-aspartate.

[0047] According to the invention, the allophanates (b1) have an NCO functionality equal to 2.1±0.3, or preferentially 2.1±0.2, or preferentially 2.1±0.1, and have the general formula (VI), JPEG2024520347000007.jpg5060In formula, R3 and R4 may be the same or different and represent a hydrocarbon group containing at least one functional group selected from an isocyanate, a carbamate, a urea, a biuret urea, an acylurea, an isocyanurate, a blocked isocyanate or an allophanate functional group; -R5 represents the residue of a molecule containing an OH functional group after reaction of this OH functional group with an isocyanate functional group, which molecule containing an OH group may also contain an ether or polyether functional group, at least one of whose hydroxyl groups is substituted, and which has the general formula (VII), C12 ~C 20 Linear aliphatic monoalcohol, C 12 ~C 20 Branched aliphatic monoalcohols, C2-C 40 Linear diol or C3-C 40 selected from branched diols, JPEG2024520347000008.jpg38153In the formula, T1 is C1 to C 20 Straight chain alkyl groups, C1-C 20 Branched alkyl group, a group of formula T3-CO-CH3, where T3 is a C1-C 20 Straight chain alkyl group or C1-C 20 T2 represents hydrogen or an alkyl group, preferably a C1-C8 alkyl group or an ether group of the formula -CH2OT4, in which T4 represents a hydrocarbon chain, in particular a polyalkylene chain or a polyoxyalkylene chain or a polyoxyethylene chain, and m represents an integer in the range of 1 to 50.

[0048] A blocked isocyanate functional group is understood to mean any isocyanate functional group that has reacted with an isocyanate functional group blocking agent. The various blocking reactions are reversible and the deblocking conditions are known to those skilled in the art.

[0049] Preferably, T4 represents a polyalkylene chain or a polyoxyalkylene chain or a polyoxyethylene chain.

[0050] Preferably, the allophanate (b1) is a compound of general formula (VI), in which R3 and R4, which may be the same or different, represent a group selected from isocyanate, carbamate, urea, biuret urea dione, acylurea, isocyanurate, blocked isocyanate or allophanate functional groups and which comprises at least one functional group selected from aliphatic, cycloaliphatic, heterocyclic or aromatic hydrocarbon groups. Preferably, R3 and R4, which may be the same or different, represent an aliphatic hydrocarbon group containing at least one functional group selected from isocyanate, carbamate, urea, biuret urea dione, acylurea, isocyanurate, blocked isocyanate or allophanate functional groups.

[0051] A blocked isocyanate functional group is understood to mean any isocyanate functional group that has reacted with an isocyanate functional group blocking agent. The various blocking reactions are reversible and the deblocking conditions are known to those skilled in the art.

[0052] According to the invention, the allophanate (b1) may be a homoallophanate in which R3 and R4 are identical, or the allophanate (b1) may be a mixed allophanate in which R3 and R4 are different.

[0053] According to the invention, the coating composition may comprise a mixture of different allophanates (b1) of general formula (VI).

[0054] The mixture of allophanates (b1) may comprise at least 25% by weight, advantageously at least 33% by weight, preferably at least 50% by weight of at least one monoallophanate.

[0055] The mixture of allophanates (b1) may also comprise at least one allophanate selected from bis-allophanates, tris-allophanates, one or more allophanate oligomers, and a minority of isocyanate carbamates resulting from the reaction of a compound of the formula R4NCO with an alcohol of the formula R5OH, or a mixture of isocyanate carbamates resulting from the reaction of a compound of the formula R3NCO with an alcohol of the formula R5OH, or a mixture of isocyanate carbamates resulting from the reaction of a compound of the formula R4NCO with a compound of the formula R3NCO with an alcohol of the formula R5OH.

[0056] According to the invention, compound (b2) is a polyfunctional isocyanate, preferably of general formula (VIII): JPEG2024520347000009.jpg3545, wherein R6, R7 and R8 independently represent a hydrocarbon group or an aliphatic, alicyclic, heterocyclic or aromatic heterocarbon group containing at least one functional group selected from an isocyanate, a carbamate, a urea, a biuret, a uretindione, an acylurea, an isocyanurate, a blocked isocyanate or an allophanate functional group; -p represents an integer selected from 0, 1 or 2; -Y represents a group selected from an isocyanurate group of formula (Y1), an iminooxadiazinedione group of formula (Y2), an oxadiazinetrione group of formula (Y3), a biuret group of formula (Y4), or a group of formula (Y5), JPEG2024520347000010.jpg39136In formula, -R9 is independently a hydrogen atom, a hydrocarbon group, or a C1-C 20 a hydrocarbon group, a heterocarbon group containing at least one heteroatom selected from O, N, S, and Si, a C1-C 20 represents a heterocarbon group, -q represents an integer selected from 3 or 4, -R 10represents a group selected from a hydrocarbon group, an alkyl group, a heterocarbon group, an aliphatic, alicyclic, heterocyclic or aromatic heterocarbon group, including a functional group selected from an isocyanate, a carbamate, a urea, a biuret, a uretindione, an acylurea, an isocyanurate, a blocked isocyanate or an allophanate functional group, a group derived from pentaerythritol, and a group derived from trimethylolpropane.

[0057] Preferentially, Y in general formula (VIII) is an isocyanurate group (Y1) and / or a biuret (Y4).

[0058] In particular, the polyfunctional isocyanate (b2) is - polyisocyanate isocyanurates (Y1) resulting from a tricondensation reaction, or - polyisocyanates (Y4) containing from 1% to 99% by weight of biuret, or preferentially from 2% to 75% by weight of biuret, or - a polyisocyanate isocyanurate (Y1) resulting from a tricondensation reaction and a polyisocyanate (Y4) comprising from 1% to 99% by weight of biuret, or preferentially from 2% to 75% by weight of biuret.

[0059] More preferentially, the polyfunctional isocyanate (b2) is a group containing at least one isocyanurate and / or biuret, the group being selected from the following compounds: hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), bis(4,4'-isocyanatocyclohexyl)methane, 1,4-cyclohexylene diisocyanate, 1,3-bis(isocyanatomethyl)benzene (XDI), 1,3-bis(isocyanatomethyl)benzene (XDI), The isocyanatoprop-2-yl diisocyanates are obtained by the oligomerization of bis(2-isocyanatoprop-2-yl)-benzene, 1,4-bis(2-isocyanatoprop-2-yl)-benzene (TMXDI), norbornane diisocyanate (NBDI), hydroxylylene diisocyanate (H6XDI), 1,4-cyclohexyl diisocyanate (H6PPDI), 1,5-pentane diisocyanate (PDI) and / or dicyclohexylmethane diisocyanate.

[0060] The additives (c) are preferably selected from wetting agents, dispersants, matting agents, defoamers, thickeners, molecular sieves, elastomers, pigments, surface coatings and coalescing agents.

[0061] The amount of additive (c) added can vary in proportions known to those skilled in the art.

[0062] The present invention also relates to a method for preparing the composition, comprising the steps of: 1. Preparing at least one polyaspartic acid ester (a) 2. Preparing at least one isocyanate compound (b) 3. Optionally, preparing at least one additive (c) 4. Mixing the preparations obtained in steps 1 and 2, and optionally step 3.

[0063] In particular, the method of preparing the composition comprises the steps of: 1. Preparing at least one polyaspartic acid ester (a) 2. Preparing at least one isocyanate compound (b1) and at least one isocyanate compound (b2) 3. Optionally, preparing at least one additive (c) 4. Mixing the preparations obtained in steps 1 and 2, and optionally step 3.

[0064] Preferentially, compound (b1) and compound (b2) are premixed with each other before being mixed with the other compound (a) and optionally compound (c).

[0065] Preferentially, the preparation of compound (a) is premixed with the preparation of additive (c) before mixing with the isocyanate compound (b1) and compound (b2).

[0066] The different preparations of compound (a), compound (b) and optionally compound (c), or compound (a), compound (b1), compound (b2) and optionally compound (c), may be carried out in any order.

[0067] Another object of the invention is the use of the composition as an adhesive or protective coating for a substrate or coated substrate.

[0068] Another object of the present invention is an adhesive or protective coating comprising the composition on a substrate or coated substrate.

[0069] Preferentially, the substrate or coated substrate according to the invention is a floor, a roof, a waterproof membrane, a wind turbine mast, an aircraft wing, a rotor blade, a propeller blade or a turbine blade. EXAMPLES

[0070] material: The product Feiyang F420 is a polyaspartic acid ester resin consisting of an aliphatic ring substituted with a secondary amine. This resin is similar to Desmophen NH-1420 and Teraspartic 277 resins. Properties of Feiyang F420: Equivalent amine (g / mol): 277 ●Kinematic viscosity at 25℃: 1000~1500mPa·s ●Density: 1.06

[0071] The product Feiyang F520 is a polyaspartic acid ester resin consisting of an aliphatic ring substituted with a secondary amine. This resin is similar to Desmophen NH-1520 and Teraspartic 292 resins. Properties of Feiyang F520: Equivalent amine (g / mol): 290 ●Kinematic viscosity at 25℃: 1200~1500mPa·s ●Density: 1.06

[0072] Tolonate HDT is an isocyanurate-type polyisocyanate prepared from hexamethylene diisocyanate.

[0073] Features of Tolonate HDT: ●NCO functionality: 21.5-22.5% ●Kinematic viscosity (25℃): 2000~2800mPa・s ●Density (25℃): 1.16

[0074] Tolonate HDT-LV is an isocyanurate-type polyisocyanate prepared from hexamethylene diisocyanate.

[0075] Tolonate HDT-LV Features: ●NCO functionality: 22-24% ●Kinematic viscosity (25℃): 900~1500mPa・s ●Density (25℃): 1.16

[0076] Tolonate HDB is a biuret type polyisocyanate prepared from hexamethylene diisocyanate.

[0077] Features of Tolonate HDB: ●NCO functionality: 21-23% ●Kinematic viscosity (25℃): 7000~11000mPa・s ●Density (25℃): 1.12

[0078] Tolonate HDB-LV is a biuret type polyisocyanate prepared from hexamethylene diisocyanate.

[0079] Tolonate HDB-LV Features: ●NCO functionality: 22.5-24.5% ●Kinematic viscosity (25℃): 1500~2500mPa・s ●Density (25℃): 1.12

[0080] HDT dimer is an isocyanurate-type polyisocyanate prepared from hexamethylene diisocyanate.

[0081] ●NCO functionality: 22-24% ●Kinematic viscosity (25℃): 450~750mPa・s ●Density (25℃): 1.13

[0082] Tolonate X-FLO100 is an allophanate-type polyisocyanate prepared from hexamethylene diisocyanate.

[0083] Tolonate X-FLO100 Features: ●NCO functionality: 11.3-13.3% ●Kinematic viscosity (25℃): 60~220mPa·s ●Density (25℃): 1.04

[0084] Silosiv A3 is an additive useful as a molecular sieve.

[0085] Tego Airex 944 is an additive useful as an antifoam agent.

[0086] BYK378 is an additive that is useful as a surfactant.

[0087] All additives, polyisocyanates and resins used in the examples are commercially available products.

[0088] Example 1: Preparation of composition (A) To prepare composition (A), the various products are weighed out according to the proportions shown in Table 1 and then mixed using a Speedmixer until the mixture is homogenized.

[0089] Table 1 shows the proportions of each polyaspartic acid resin and additives for each composition A.

[0090] [Table 1]

[0091] Example 2: Preparation of polyisocyanate composition (B) To produce composition (B), a mixture is prepared according to the proportions set out in Table 2. The polyisocyanate mixture (B) is then homogenized in the mixing unit for at least overnight.

[0092] The NCO content is determined by titration of the -NCO functional group of each compound using a back titration of dibutylamine with a hydrochloric acid solution.

[0093] The viscosity is measured at 25°C using an Anto-Paar viscometer with a cone surface geometry having an angle of 2°. The shear rate during the measurement ranged from 0.1 to 100 s 2 with ascending and descending shear rates. -1 The range is.

[0094] Low viscosity is defined by a viscosity below 1500 mPa·s and sufficient NCO content is defined by a value above 13%.

[0095] Table 2 shows the proportion of polyisocyanate, viscosity and NCO content for each composition B.

[0096] [Table 2]

[0097] As shown in Table 2, compositions B3, B6, B10, B13 and B20 contain 100% of their respective isocyanates and are comparative examples.

[0098] The results show that the viscosity decreases as the amount of Tolonate X-FLO 100 used in composition (B) increases. The use of a proportion of Tolonate X-FLO 100 of 60% or more makes it possible to obtain compositions (B) with a viscosity of less than 1500 mPa·s at 25° C. and an NCO content of more than 13%.

[0099] The comparative examples have an NCO content above 13% but, with the exception of example B6, have a viscosity above 1500 mPa·s.

[0100] Example 3: Stretching of the composition The elongation of the coating obtained from the mixture between composition (A) and polyisocyanate (B) described in examples 1 and 2 is measured. The mixture is carried out using a Speedmixer to ensure good homogeneity, and then the formulation thus obtained is crosslinked for 7 days in an enclosure conditioned at 23°C and 50% humidity. The mixing ratio between composition (A) and composition (B) is defined by an equimolar NCO / NH ratio, i.e. constant and equal to 1. NH functional groups are present in composition (A) and NCO functional groups are present in polyisocyanate (B).

[0101] The elongation measurements are carried out on standardized format specimens (type 5A specimens according to standard ISO 527-2) with a thickness of 1-2 mm using a traction machine (MTS). The traction speed is set at 10 mm / min.

[0102] The elongation at break corresponds to the elongation value reached when the specimen breaks. Samples with an elongation at break of more than 50% are considered to have improved flexibility.

[0103] Table 3 shows the elongation at break results for various Compositions A and B.

[0104] [Table 3]

[0105] As specified in Table 3, compositions B3, B6, B10, B13 and B20 containing polyisocyanate mixtures are comparative examples (comparison). These comparative examples stand out for their low flexibility (elongation at break much less than 50%). Example B6, despite having a low viscosity, could not obtain a sufficient elongation at break (more than 50%). Elongation measurements of the mixtures containing composition B10 could not be carried out because the viscosity of the mixtures was too high to be applied properly.

[0106] The mass proportion of Tolonate X-FLO100 in composition (B) is 60% or more, thereby improving the flexibility of the composition. This effect is even more remarkable when a mixture containing composition (A2) is used.

Claims

1. A composition for preparing a coating, comprising: at least one polyaspartic acid ester compound (a), A mixture (b) of isocyanate compounds having an —NCO content of more than 13% and a viscosity at 25° C. of less than 1500 mPa·s, at least one allophanate (b1), at least one polyfunctional isocyanate (b2), The mass ratio (b1) / (b2) is 50 / 50 to 99 / 1; a mixture in which the molar ratio (b) / (a), defined by the number of NCO functional groups of (b) and the number of NH functional groups of (a), is between 0.7 and 1.3, at least one additive (c).

2. The polyaspartic acid ester (a) is represented by the general formula (I): A polyaspartic acid ester according to the formula: -X represents an aliphatic chain or a polyether chain; -R １ and R ２ are each independently an organic group which is inert to an isocyanate group at standard atmospheric pressure and at or below 100° C., The composition according to claim 1 , wherein -n represents an integer of 2 or greater.

3. 3. The composition of claim 2, wherein the aliphatic residue X comprises one or more residues selected from polyether residues, linear alkyl residues, branched alkyl residues, and cycloalkyl residues.

4. The polyaspartic acid ester (a) of the general formula (I) is general formula (II) and / or general formula (III) and / or - general formula (IV) and / or -General formula (V) wherein R １ Groups and R ２ The groups are, independently of each other, １ ~C １０ The composition according to claim 2 or 3, wherein u is an alkyl group and u is an integer from 1 to 10.

5. R １ Groups and R ２ The composition of claim 4, wherein the groups are, independently of each other, one or more methyl, ethyl or butyl groups.

6. 2. The composition of claim 1, wherein the polyaspartic acid ester (a) is selected from tetraethyl N,N'-(methylenedicyclohexane-4,1-diyl)bis-DL-aspartate, N,N'-(tetraethylmethylenebis(2-methyl-cyclohexane-4,1-diyl)bis-DL-aspartate, or tetraethyl N,N'-(2-methylpentane)bis-DL-aspartate.

7. said allophanate (b1) having an NCO functionality equal to 2.1±0.3 and having the general formula (VI) During the ceremony, -R ３ and R ４ represent a hydrocarbon group, which may be the same or different, containing at least one functional group selected from an isocyanate, a carbamate, a urea, a biuret urea, an acylurea, an isocyanurate, a blocked isocyanate or an allophanate functional group; -R ５ represents the residue of a molecule comprising an OH functional group after reaction of this OH functional group with an isocyanate functional group, which molecule may also comprise an ether or polyether functional group, at least one of whose hydroxyl groups is substituted, and has the general formula (VII), C １２ ~C ２０ Linear aliphatic monoalcohol, C １２ ~C ２０ Branched aliphatic monoalcohol, C ２ ~C ４０ Linear diol or C ３ ~C ４０ selected from branched diols, In the ceremony, T １ is C １ ~C ２０ Straight chain alkyl group, C １ ~C ２０ Branched alkyl groups of formula T ３ -CO-CH ３ represents a group of the formula ３ is C １ ~C ２０ Linear alkyl group or C １ ~C ２０ represents a linear alkyl group, T ２ is hydrogen or a group of the formula -CH ２ O.T. ４ In the formula, T represents an alkyl group or an ether group. ４ The composition of claim 1 , wherein: represents a hydrocarbon chain; and m represents an integer ranging from 1 to 50.

8. R ３ and R ４ 8. The composition of claim 7, wherein x may be the same or different and represent an aliphatic hydrocarbon group containing at least one functional group selected from an isocyanate, a carbamate, a urea, a biuret urea dione, an acylurea, an isocyanurate, a blocked isocyanate, or an allophanate functional group.

9. The compound (b2) is represented by the general formula (VIII): at least one polyfunctional isocyanate of the formula: -R ６ , R ７ and R ８ independently represent a hydrocarbon group or an aliphatic, alicyclic, heterocyclic or aromatic heterocarbon group containing at least one functional group selected from an isocyanate, a carbamate, a urea, a biuret, a uretindione, an acylurea, an isocyanurate, a blocked isocyanate or an allophanate functional group; -p represents an integer selected from 0, 1 or 2; -Y is a group represented by the formula (Y １ ) isocyanurate groups of the formula (Y ２ ), an iminooxadiazinedione group of the formula (Y ３ oxadiazinetrione groups of the formula (Y ４ ) or a biuret group of the formula (Y ５ ) groups selected from the group During the ceremony, -R ９ are independently a hydrogen atom, a hydrocarbon group, １ ~C ２０ a hydrocarbon group, a heterocarbon group containing at least one heteroatom selected from O, N, S, and Si; a C group containing at least one heteroatom selected from O, N, S, and Si; １ ~C ２０ represents a heterocarbon group, -q represents an integer selected from 3 or 4, -R １０ represents a group selected from a hydrocarbon group, an alkyl group, a heterocarbon group, an aliphatic, alicyclic, heterocyclic or aromatic heterocarbon group, including a functional group selected from an isocyanate, a carbamate, a urea, a biuret, a uretindione, an acylurea, an isocyanurate, a blocked isocyanate or an allophanate functional group, a group derived from pentaerythritol, a group derived from trimethylolpropane.

10. The Y group is an isocyanurate (Y １ ) and / or biuret groups (Y ４ 10. The composition of claim 9, wherein

11. The polyfunctional isocyanate (b2) is a group containing at least one isocyanurate and / or biuret, the group being selected from the following compounds: hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), bis(4,4'-isocyanatocyclohexyl)methane, 1,4-cyclohexylene diisocyanate, 1,3-bis(isocyanatomethyl)benzene (XDI), 1,3-bis(2-isocyanato 11. The composition of claim 10, obtained from the oligomerization of 1,4-bis(2-isocyanatoprop-2-yl)-benzene, 1,4-bis(2-isocyanatoprop-2-yl)-benzene (TMXDI), norbornane diisocyanate (NBDI), hydroxylylene diisocyanate (H6XDI), 1,4-cyclohexyl diisocyanate (H6PPDI), 1,5-pentane diisocyanate (PDI) and / or dicyclohexylmethane diisocyanate.

12. 2. The composition of claim 1, wherein the additive (c) is selected from wetting agents, dispersants, matting agents, defoamers, thickeners, molecular sieves, elastomers, pigments, surface coatings and coalescing agents.

13. 13. A method for preparing the composition of claim 1, comprising:

1. Preparing at least one polyaspartic acid ester (a); 2. Preparing at least one isocyanate compound (b1) and at least one isocyanate compound (b2); 3. Preparing at least one additive (c); 4. A method comprising mixing the preparations obtained in steps 1 and 2 and step 3.

14. 13. Use of the composition of claim 1 as an adhesive or protective coating for a substrate or coated substrate.

15. 13. An adhesive or protective coating comprising the composition of claim 1 on a substrate or coated substrate.

16. 16. The coating of claim 15, wherein the substrate or coated substrate is a floor, a roof, a waterproof membrane, a wind turbine mast, an aircraft wing, a rotor blade, a propeller blade, or a turbine blade.

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