Two-component coating composition

Abstract

The present invention relates to a two-component coating composition, a method of applying the composition and its use, and a product obtained by coating with the coating composition. The coating composition comprises a component A and a component B, wherein the component A comprises a polyaspartic acid ester, a polymeric polyol and a surface additive, the component B comprises a polyisocyanate, and the composition has a molar ratio of isocyanate groups to amino groups of 0.2 to 5. The two-component coating composition provided by the present invention has the advantages of a long pot life, a long workable time, a short walk-on time, and high hardness.

Description

Technical Field

[0001] Technical Field The present invention relates to a two-component coating composition, a coating method and use of the coating composition, and a product obtained by coating the coating composition.

Background Art

[0002] With the continuous decrease in the number of workers in the construction industry, the construction industry is facing a labor shortage problem. In order to compensate for the problems caused by the labor shortage, in the construction market including the construction floor market, new technologies that can improve construction efficiency are urgently needed.

[0003] In the current construction floor market, the only technical system that can meet the high construction efficiency requirements is the methyl methacrylate system. This system has a very high reaction rate due to the initiator-promoted polymerization of active monomers. Compared with conventional epoxy and polyurethane systems, it can effectively shorten the working time and obtain the effect of improving construction efficiency. However, the methyl methacrylate system has serious safety and environmental problems such as strong odor and sensitization of active monomers.

[0004] Chinese Patent Application Publication No. 111655805 discloses a polyester polyol for use in low-VOC polyurethane compositions. The polyester polyol is a reaction product of at least one aliphatic polycarboxylic acid, at least one alkoxylated polyol having a functionality of 2 or more, and one or more polyols other than the alkoxylated polyol. The polyester polyol can be incorporated into a polyurethane composition to obtain a polyurethane having a low VOC content.

[0005] Chinese Patent No. 110746877 provides a UV-curable polyurethane coating, as well as its preparation method and use. The coating consists of Component A (including 60 - 80 parts by weight of polyurethane acrylate, 10 - 20 parts of active monomer diluent, 1 - 20 parts of amino resin, 0.05 - 10 parts of pigment, and 10 - 30 parts of filler); Component B (including 40 - 100 parts by weight of isocyanate and 40 - 100 parts of polyol); and Component C (which is a photoinitiator). The UV-curable polyurethane coating cures to form a dense, pore-free elastic coating film with high mechanical strength, heat resistance, cold resistance, corrosion resistance, and aging resistance.

[0006] Chinese Patent No. 109843952 discloses a polyisocyanate composition containing a low-viscosity isocyanate and a polymeric polyol. The polyisocyanate has the characteristics of low viscosity, fast drying, and excellent solubility in low-polarity organic solvents.

[0007] Chinese Patent No. 110418824 provides a polyaspartic acid coating composition containing a polyaspartic acid ester compound and a polyisocyanate obtained from one or more diisocyanates selected from the group consisting of aliphatic and / or alicyclic diisocyanates.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0009] The object of the present invention is to provide a two-component coating composition, a coating method and use of the coating composition, and a product obtained by coating with the coating composition.

Means for Solving the Problems

[0010] The two-component coating composition according to the present invention includes component A and component B. Component A includes: a) a polyaspartic acid ester having a viscosity of 900 mPa·s to 2000 mPa·s, and the viscosity is measured according to DIN 53019; b) a polymeric polyol having a molecular weight of 250 g / mol to 420 g / mol; c) a surface additive, and optionally a pigment filler, and optionally a moisture scavenger; and includes The polyaspartic acid ester has the structure of formula I:

[0011]

Chemical formula

[0012] According to one aspect of the present invention, there is provided the use of a coating composition provided according to the present invention for protecting a substrate surface or for coating on a substrate surface.

[0013] According to another aspect of the present invention, there is provided a coating method comprising the steps of applying a coating composition provided according to the present invention to a substrate surface, followed by curing and drying.

[0014] According to another aspect of the present invention, there is provided a coated product comprising a substrate and a coating formed by applying, curing and drying a coating composition provided according to the present invention to the substrate.

[0015] The two-component coating composition of the present invention has high hardness, and on the premise of meeting the construction requirements of one-through thick coating (the dry film thickness reaches 2 mm), it has a long pot life, a long available working time, and a short walk-on time, which is advantageous for improving the coating construction efficiency.

[0016] In addition, the two-component coating composition of the present invention is a solvent-free two-component polyaspartic acid ester coating, which can improve the problems of strong odor and high sensitivity of existing coatings, and is a safe coating that is friendly to the environment and labor hygiene.

Embodiments for Carrying out the Invention

[0017] Detailed Description The present invention provides a two-component coating composition comprising Component A and Component B. Component A comprises: A) a polyaspartic acid ester having a viscosity of 900 mPa·s to 2000 mPa·s, the viscosity being measured according to DIN 53019; b) a polymeric polyol having a molecular weight of 250 g / mol to 420 g / mol; C) a surface additive, and the polyaspartic acid ester has the structure of Formula I:

[0018] [Chemical Formula] [wherein, R 1 and R 2 are each independently selected from methyl, ethyl or butyl]; the amount of the polymeric polyol is 0.15% by weight to 0.35% by weight; the total weight of the polyaspartic acid ester and the polymeric polyol is 40% by weight to 97% by weight; the amounts are both based on the total weight of Component A; Component B comprises a polyisocyanate which is a uretdione, allophanate, isocyanurate, or a mixture thereof based on the polymerization of an aliphatic and / or alicyclic diisocyanate, wherein the polyisocyanate has a viscosity of 80 mPa·s to 580 mPa·s, the viscosity being measured at a shear rate of 10 s -1 at a test temperature of 23 °C and using the selected rotor of MV-DIN according to DIN EN ISO 3219 / A.3; the composition has a molar ratio of isocyanate groups to amino groups of 0.2 to 5. The present invention also provides a method of coating a two-component coating composition, and the use of the composition, as well as a product obtained by coating with the coating composition.

[0019] With respect to the two-component coating composition used herein, the term two-component refers to a coating composition containing at least two components that must be stored in separate containers due to their reactivity. When these two separate components are mixed and applied to a substrate, the reactive compounds in the two components react and crosslink to form a cured coating layer.

[0020] As used herein, the term "curing and drying" refers to the process of a liquid coating composition changing from a liquid state to a cured state.

[0021] The solid content of the dispersion of the present invention means the content of the solid components in the dispersion or the active components in the dispersion.

[0022] Two-Component Coating Composition The composition preferably has a molar ratio of isocyanate groups to amino groups of 1 to 1.5.

[0023] The two-component coating composition has an organic solvent content of less than 60 g / L. The two-component coating composition is most preferably a solvent-free two-component coating composition.

[0024] Component A The total of the weight of the polyaspartic acid ester and the weight of the polymeric polyol is preferably 40% to 90% by weight, most preferably 40% to 46% by weight, and both of the above amounts are based on the total weight of the component A.

[0025] Polyaspartic Acid Ester a) Most preferably, the R 1 and R 2 are each independently ethyl.

[0026] The polyaspartic acid ester preferably has an amine value of 150 mgKOH / g to 250 mgKOH / g, and the amine value is measured according to 2011-0605401-05D.

[0027] The polyaspartic acid ester preferably has an amino equivalent of 200 to 300.

[0028] The polyaspartic acid ester preferably has a solid content of 100% by weight.

[0029] Polymeric Polyol b) Regarding the present invention, the term "polymer polyol" is understood to mean "polymeric polyol".

[0030] The polymer polyol preferably has a molecular weight of 320 g / mol to 420 g / mol.

[0031] The molecular weight is calculated as follows: Molecular weight = 56.1×1000×f / (hydroxyl value of the polymer polyol + acid value of the polymer polyol), where 56.1 is the molecular weight of KOH and f is the functionality of the polymer polyol.

[0032] The hydroxyl value of the polymer polyol = hydroxyl content of the polymer polyol × 100 × 33, and the hydroxyl content of the polymer polyol is determined according to DIN53240 / 2. The acid value of the polymer polyol is determined according to the standard of DIN EN ISO 2114.

[0033] The polymer polyol preferably has a solids content of 100% by weight.

[0034] The polymer polyol preferably has a hydroxyl functionality of 2 or more, most preferably 2 to 3.

[0035] The polymer polyol preferably has a hydroxyl content of 8% to 16% by weight based on the total weight of the polymer polyol.

[0036] The amount of the polymer polyol is preferably 0.2% to 0.3% by weight based on the total weight of component A.

[0037] The polymer polyol is preferably one or more of polyester polyol and polyethylene glycol.

[0038] Component c): Surface Additive, Pigment Filler, Moisture Scavenger Component c) includes a surface additive, optionally a pigment filler, and optionally a moisture scavenger.

[0039] The surface additive is preferably one or more of a dispersant, an antifoaming agent, and a wetting agent and a leveling agent.

[0040] The amount of the surface additive is preferably 0.1% by weight to 3% by weight based on the total weight of component A.

[0041] The dispersant is preferably BYK111 manufactured by Byk chemical company in Germany.

[0042] The antifoaming agent is preferably BYK1799 manufactured by Byk chemical company in Germany.

[0043] The wetting agent and the leveling agent are preferably BYK320 manufactured by Byk chemical company in Germany.

[0044] The pigment filler is preferably a mixture of barium sulfate and titanium white powder.

[0045] The titanium white powder is preferably rutile-type titanium dioxide R706 manufactured by Chemours in the United States.

[0046] The barium sulfate is preferably barium sulfate prepared by Sachtleben Chemie GmbH in Germany and having a particle size of 6000 mesh.

[0047] The moisture scavenger is preferably SYLOSIV A4 molecular sieve manufactured by Grace in the United States.

[0048] The amount of the pigment filler is preferably 60% by weight or less, most preferably 35% by weight to 45% by weight based on the total weight of component A.

[0049] The amount of the moisture scavenger is preferably 10% by weight or less, most preferably 4% by weight to 6% by weight based on the total weight of component A.

[0050] Component B The polyisocyanate contained in Component B can be one polyisocyanate or a mixture of polyisocyanates.

[0051] The polyisocyanate is preferably a uretdione, allophanate, isocyanurate, or a mixture thereof based on the polymerization of aliphatic and / or alicyclic diisocyanates.

[0052] The aliphatic diisocyanate is preferably one or more of hexamethylene diisocyanate (HDI), 2,2-dimethylpentamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, butylene diisocyanate, 1,3-butadiene-1,4-diisocyanate, 2,4,4-trimethyl-1,6-hexamethylene diisocyanate, bis(isocyanatoethyl) carbonate, bis(isocyanatoethyl) ether, and lysine methyl ester diisocyanate, and most preferably hexamethylene diisocyanate.

[0053] The alicyclic isocyanate is preferably isophorone diisocyanate (IPDI), isomer bis(4,4'-isocyanatocyclohexyl)methane or a mixture thereof with any isomer content, 1,4-cyclohexylene diisocyanate, 1,3-bis(isocyanatomethyl)benzene (XDI), 1,3- and / or 1,4-bis(2-isocyanatoprop-2-yl)benzene (TMXDI), norbornane diisocyanate (NBDI), hydrogenated xylylene diisocyanate (H 6 XDI), 1,4-cyclohexyl diisocyanate (H 6 PPDI), 1,5-pentamethylene diisocyanate (PDI), and dicyclohexylmethane diisocyanate, or one or more of them.

[0054] The polyisocyanate is most preferably a uretdione, allophanate, isocyanurate, or a mixture thereof based on the polymerization of hexamethylene diisocyanate.

[0055] The polyisocyanate of component B preferably has an isocyanate functionality of more than 2 and less than 3, and most preferably 2.5.

[0056] The polyisocyanate of component B most preferably has a viscosity of 100 mPa·s to 560 mPa·s, and the viscosity is measured at a shear rate of 10 s according to DIN EN ISO 3219 / A.3 at a test temperature of 23 °C with the selected rotor of MV-DIN. -1 and is measured at a shear rate of 10 s.

[0057] The polyisocyanate of component B preferably has a solid content of 100% by weight based on the total weight of component B.

[0058] The polyisocyanate of component B preferably has an isocyanate group content of 18% to 22% by weight based on the total weight of the polyisocyanate.

[0059] Use Substrate The substrate may be artificial stone, wood, artificial wood, marble, terrazzo, ceramic, linoleum, metal, mineral material, plastic, rubber, concrete, composite board, paper, leather or glass.

[0060] The substrate can preferably be pretreated by polishing or coating.

[0061] Coating Method Coating can be carried out by methods well known to those skilled in the art such as blade coating, dip coating, brush coating, roller coating, spray coating, or curtain coating.

[0062] Coated Product The coated product is preferably a floor.

[0063] The thickness of the coating is preferably 1 mm to 3 mm.

[0064] The coating layer may be single-layer or multi-layer.

Example

[0065] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. Insofar as the definitions of the terms used in this specification conflict with the meanings commonly understood by one of ordinary skill in the technical field to which this invention belongs, the definitions described in this specification shall prevail.

[0066] Unless otherwise indicated, all numbers representing amounts of ingredients, reaction conditions, etc. used in this specification and the claims are to be understood as being modified by the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth in this specification are approximations that may vary depending upon the desired properties to be obtained.

[0067] As used in this specification, the expression "and / or" means one or all of the recited elements.

[0068] The use of "comprise" and "contain" in this specification encompasses the presence of the recited element alone and the presence of other elements not recited in addition to the recited element.

[0069] All percentages in the present invention are by weight unless otherwise specified.

[0070] The analysis and measurement according to the present invention are carried out at a temperature of 25 ± 2°C and a humidity of 60 ± 10% unless otherwise specified.

[0071] The isocyanate group (NCO) content is measured volumetrically according to DIN-EN ISO 11909, and the measurement data includes the free and potentially free NCO content.

[0072] The isocyanate functionality is determined according to GPC.

[0073] The amino group content is determined according to AFAM 2011-06054.

[0074] The viscosity of the polyaspartic acid ester is measured according to DIN 53019.

[0075] The viscosity of the polyisocyanate is measured at a test temperature of 23 °C and a shear rate of 10 s -1 using the selected rotor of MV-DIN according to DIN EN ISO 3219 / A.3.

[0076] Pot life of the two-component coating composition: Continuously measure with a Brookfield rotor viscometer (64# rotor, rotation speed 20 rpm, ambient temperature 23 °C, ambient humidity 50%) until the viscosity reaches 10,000 mPa·s to 12,000 mPa·s 3 minutes after mixing the component A and component B, record the time as the pot life after the measurement ends. If the viscosity does not reach 10,000 mPa·s within 50 minutes of continuous measurement after mixing, end the measurement and record the pot life as 50 minutes. A qualified pot life is 10 minutes or more.

[0077] Working time: Mix component A and component B to obtain a two-component coating composition; pour an appropriate amount of the composition onto a stainless steel plate, flatten the coating with a 2 mm serrated scraper, defoam the surface of the coating with a defoaming roller every 5 minutes. If the rolling marks of the defoaming roller cannot be removed, stop the operation and record the duration as the available working time of the coating composition. A qualified working time is 10 minutes or more.

[0078] Walk-on time: Mix Component A and Component B to obtain a two-component coating composition. Pour an appropriate amount of the coating composition into a circular PE plastic mold with a diameter of 7.5 cm to form a 2-mm-thick coating film. Press the coating film with the thumb and fingernail at a pressure of 3 kg every 30 minutes for confirmation. If no obvious collapse is formed after pressing the coating film, or if the collapse can recover by itself within 10 seconds, stop the operation and record the duration as the walk-on time. A qualified walk-on time is 3 hours or less.

[0079] Hardness: Measure in accordance with JIS K6253 (Shore D). A qualified hardness is 70 or above.

[0080] Raw Materials and Reagents Desmophen® NH 1420: A polyaspartic acid ester having a solid content of 100% by weight, an amino group functionality of 2.0, an amino equivalent of 279, and a viscosity of 900 - 2000 mPa·s (25°C), commercially available from Covestro AG (Germany).

[0081] Desmophen® NH 1220: A polyaspartic acid ester having a solid content of 100% by weight, an amino group functionality of 2.0, an amino equivalent of 234, and a viscosity of ≤100 mPa·s (25°C), commercially available from Covestro AG (Germany).

[0082] Desmophen® NH 1520: A polyaspartic acid ester having a solid content of 100% by weight, an amino group functionality of 2.0, an amino equivalent of 290, and a viscosity of 800 - 2000 mPa·s (25°C), commercially available from Covestro AG (Germany).

[0083] Desmophen® NH 2850: A polyaspartic acid ester having a solids content of 100% by weight, an amino equivalent of 295, and a viscosity of ≧80 mPa·s (25 °C), commercially available from Covestro AG (Germany).

[0084] Desmodur® N 3400: An HDI-based aliphatic uretdione having a solids content of 100% by weight, an NCO content of 21.8% by weight, an HDI monomer content of less than 0.3% by weight, an isocyanate functionality of 2.5, and a viscosity of about 175 mPa·s (23 °C).

[0085] Desmodur® N 31100: An HDI-based aliphatic trimer and allophanate having a solids content of 100% by weight, an NCO content of 19.5% by weight, an HDI monomer content of less than 0.1% by weight, an isocyanate functionality of 2.5, and a viscosity of about 500 mPa·s (23 °C).

[0086] Desmodur® N 3600: An HDI-based aliphatic trimer having a solids content of 100% by weight, an NCO equivalent of 183, an NCO content of 23.0% by weight, an HDI monomer content of less than 0.25% by weight, an isocyanate functionality of 3.2, and a viscosity of 1200 mPa·s (23 °C).

[0087] Desmodur® N 3900: An HDI-based aliphatic trimer having a solids content of 100% by weight, an NCO content of 23.5% by weight, an HDI monomer content of less than 0.25% by weight, an isocyanate functionality of 3.2, and a viscosity of about 730 mPa·s (23 °C).

[0088] DISPERBYK 111: An acid group-containing copolymer, wetting agent and dispersant, commercially available from Byk Chemistry.

[0089] BYK1799: A mixture of an antifoaming polysiloxane and hydrophobic particles, an antifoaming agent, commercially available from Byk Chemistry.

[0090] BYK320: A polyether-modified polymethylalkylsiloxane solution, wetting agent and leveling agent, commercially available from Byk Chemistry.

[0091] BaSO 4 : Pigment filler, 6000 mesh, commercially available from Sachtleben.

[0092] R706: Titanium white powder, pigment filler, commercially available from Chemours.

[0093] SYLOSIV A4: Moisture scavenger, molecular sieve, commercially available from Grace.

[0094] BDO: Butanediol with a hydroxyl content of 37.8%, a hydroxyl functionality of 2, and a calculated molecular weight of 90 g / mol, commercially available from Sinopharm Chemical Reagent Co., Ltd.

[0095] Desmophen® VP LS 2249 / 1: A polyester polyol with a solids content of 100 wt%, a hydroxyl content of 15.5 wt%, a hydroxyl functionality of 3, and a calculated molecular weight of 329 g / mol, commercially available from Covestro Co., Ltd.

[0096] Desmophen® 850: A polyester polyol with a solids content of 100 wt%, a hydroxyl content of 8.5 wt%, a hydroxyl functionality of 2, and a calculated molecular weight of 400 g / mol, commercially available from Covestro Co., Ltd.

[0097] Desmophen® 1380 BT: A polyether glycol with a solids content of 100 wt%, a hydroxyl content of 11.7 wt%, a hydroxyl functionality of 3, and a calculated molecular weight of 436 g / mol, commercially available from Covestro Co., Ltd.

[0098] Desmophen® C 1100: A polycaprolactone-modified linear aliphatic polycarbonate polyol with a solids content of 100% by weight, a hydroxy content of 3.3% by weight, a hydroxy functionality of 2, and a calculated molecular weight of 1030 g / mol, which is commercially available from Covestro Co., Ltd.

[0099] Desmophen® 3170: A polyether glycol based on polypropylene oxide and polyethylene oxide, having a hydroxy content of 3.0% by weight, a hydroxy functionality of 6, and a calculated molecular weight of 3400 g / mol.

[0100] PEG200: A polyethylene glycol with a hydroxy content of 17 wt%, a hydroxy functionality of 2, and a calculated molecular weight of 200 g / mol, which is commercially available from Sinopharm Chemical Reagent Co., Ltd.

[0101] PEG400: A polyethylene glycol with a hydroxy content of 8.5% by weight, a hydroxy functionality of 2, and a calculated molecular weight of 400 g / mol, which is commercially available from Sinopharm Chemical Reagent Co., Ltd.

[0102] PEG600: A polyethylene glycol with a hydroxy content of 5.66 wt%, a hydroxy functionality of 2, and a calculated molecular weight of 600 g / mol, which is commercially available from Sinopharm Chemical Reagent Co., Ltd.

[0103] The molecular weight of the above polymer polyol is calculated as follows: Molecular weight = 56.1×1000×f / (hydroxyl value of polymer polyol + acid value of polymer polyol), where 56.1 is the molecular weight of KOH, f is the functionality of the polymer polyol. Taking Desmophen® VP LS 2249 / 1 as an example, the hydroxyl value = 33×hydroxyl content of Desmophen® VP LS 2249 / 1×100 = 33×15.5%×100 = 511.5, the acid value is 0, and the calculated molecular weight of Desmophen® VP LS 2249 / 1 = 56.1×1000×3 / (511.5 + 0) = 329 g / mol.

[0104] Method for Producing Coating Composition Formulation of Component A: According to the amounts shown in Table 1, polyaspartic acid ester was added and stirred at a speed of 1000 - 2000 rpm. Then, polymer polyol and surface additive were added and continuously stirred at a speed of 1000 - 2000 rpm for 5 - 10 minutes. Next, pigment filler and moisture scavenger were added and continuously stirred at a speed of 1500 - 2500 rpm for 15 - 30 minutes to obtain Component A.

[0105] Formulation of Component B: When a single polyisocyanate was used as Component B, it was used in the as-supplied form, i.e., no additional formulation was required. When formulating multiple polyisocyanates for use, the multiple polyisocyanates were added sequentially and stirred at a speed of 500 - 1000 rpm for 5 - 10 minutes to obtain Component B.

[0106] Component B and Component A were mixed according to the NCO / NH ratio shown in Table 1 and stirred at a speed of 2000 rpm for 2 minutes to obtain the two-component coating compositions of the examples and comparative examples.

[0107] Examples 1 to 7 and Comparative Examples 1 to 14 Table 1 shows the components of the two-component coating compositions of Examples 1 - 7 and Comparative Examples 1 - 14 and the results of the property tests of the compositions.

[0108] From Examples 1 to 7, it was found that the two-component coating composition of the present invention has a long pot life, a long available working time, a short walk-on time, and high hardness.

[0109] The molecular weight of the polymer polyol contained in the two-component coating compositions of Comparative Examples 1 to 6 was less than 250 g / mol or exceeded 420 g / mol, and the coating compositions did not impair the pot life, available working time, and walk-on time.

[0110] Comparing Example 1 with Comparative Examples 7 to 8, when the content of the polymer polyol in the two-component coating composition was 0.135% by weight and 0.405% by weight, the coating composition had a long walk-on time or a short available working time.

[0111] Comparing Examples 4 to 6 with Comparative Examples 9 to 11, when the viscosity of the polyisocyanate of Component B of the two-component coating composition was less than 80 mPa·s or exceeded 580 mPa·s, the coating composition had a short pot life and a short available working time.

[0112] Comparing Example 7 with Comparative Examples 12 to 14, when the polyaspartic acid ester in Component A of the two-component coating composition of the comparative example did not have the structure of Formula I, the composition had a short pot life, was unconstructable, or had a long walk-on time and insufficient hardness.

[0113] Table 1: Components of the compositions of Examples 1 to 7 and Comparative Examples 1 to 14, and test results for the compositions and their coatings

[0114]

Table 1

Claims

1. This is a two-component coating composition comprising component A and component B, where component A is: a) Polyaspartate esters having a viscosity of 900 mPa·s to 2000 mPa·s (where viscosity is measured according to DIN 53019); b) Polymer polyols having a molecular weight of 250 g / mol to 420 g / mol; c) comprising a surface additive, and optionally a pigment filler, and optionally a moisture scavenger, wherein the polyaspartate ester is of formula I 【Chemistry 1】 [In the formula, R １ and R ２ Each has a structure independently selected from methyl, ethyl, or butyl; The amount of the polymer polyol is 0.15% to 0.35% by weight, and the sum of the weight of the polyaspartate ester and the polymer polyol is 40% to 97% by weight, both of which are relative to the total weight of component A; The aforementioned component B comprises a polyisocyanate, which is a uretdione, allophanate, isocyanurate, or mixture thereof, based on the polymerization of aliphatic and / or alicyclic diisocyanates, wherein the polyisocyanate has a viscosity of 80 mPa·s to 580 mPa·s, and the viscosity is measured in accordance with DIN EN ISO 3219 / A.3 at a test temperature of 23°C and using a selected rotor of MV-DIN for 10 seconds. －１ Measured at the shear rate; The composition has a molar ratio of 0.2 to 5 isocyanate groups to amino groups. composition.

2. The aforementioned R １ and R ２ The composition according to claim 1, characterized in that each of them is independently ethyl.

3. The composition according to claim 1, characterized in that the polyaspartate ester has at least one of the following characteristics: an amine value of 150 mg KOH / g to 250 mg KOH / g (the amine value is measured according to AFAM 2011-0605401-05D); and an amino equivalent of 200 to 300.

4. The composition according to claim 1, characterized in that the polymer polyol has a molecular weight of 320 g / mol to 420 g / mol.

5. The composition according to claim 1, characterized in that the polymer polyol has a hydroxyl functional value of 2 or more.

6. The composition according to claim 1, characterized in that the amount of the polymer polyol is 0.2% to 0.3% by weight relative to the total weight of component A.

7. The composition according to claim 1, characterized in that the surface additive is one or more of a dispersant, an antifoaming agent, a wetting agent, and a leveling agent.

8. The composition according to claim 1, characterized in that the amount of the surface additive is 0.1% to 3% by weight relative to the total weight of component A.

9. The composition according to claim 1, characterized in that the polyisocyanate of component B is uretdione, allophanate, isocyanurate, or a mixture thereof, based on the polymerization of hexamethylene diisocyanate.

10. The composition according to claim 1, characterized in that the polyisocyanate of component B has an isocyanate functional value of greater than 2 and less than 3, most preferably 2.

5.

11. The polyisocyanate component B is characterized by having a viscosity of 100 mPa·s to 560 mPa·s, where the viscosity is determined according to DIN EN ISO 3219 / A.3 at a test temperature of 23°C and using a selected rotor of MV-DIN for 10 seconds. －１ The composition according to claim 1, measured by the shear rate.

12. The composition according to claim 1, characterized in that the composition has a molar ratio of isocyanate groups to amino groups of 1 to 1.

5.

13. Use of the coating composition according to any one of claims 1 to 12 for protecting the surface of a substrate or for coating the surface of a substrate.

14. A coating method comprising the steps of applying a coating composition according to any one of claims 1 to 12 to the surface of a substrate, and subsequently curing and drying it.

15. A coated product comprising a substrate and a coating formed by applying a coating composition according to any one of claims 1 to 12 to the substrate, curing and drying, wherein the coated product is preferably a floor.

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