Hardening components

Abstract

The present invention provides a curable composition that can be colored to a desired shade and forms a coating with excellent color uniformity, finish, and other properties. [Solution] The curable composition of the present invention comprises a main component (1) containing a polyol compound, a surfactant, and water; a curing agent (2) containing a polyisocyanate compound; a powder component (3) containing cement; and a coloring liquid (4), wherein the coloring liquid (4) contains a coloring pigment and an alkyl sulfonate phenyl ester.

Description

Technical Field

[0001] The present invention relates to a novel curable composition. The composition of the present invention is particularly suitable as a coating material for floor surfaces.

Background Art

[0002] Conventionally, various materials such as urethane-based, epoxy-based, and acrylic-based materials have been used as coating materials for floor surfaces. By using such materials, the floor surface can be protected, and a desired color can be further imparted to the floor surface. However, in cases where high performance in chemical resistance, strength and the like is required, it is currently difficult for the above-mentioned materials to sufficiently satisfy such requirements.

[0003] Patent Document 1 describes a polymer cement mortar composition obtained by adding a second component containing a cement component to a first component containing a polymer component and water, wherein the polymer component of the first component contains a polyol and a polyisocyanate, and the second component contains an aggregate and a color pigment in addition to cement. Further, Patent Document 2 describes an aqueous hard urethane-based cement material containing a polyol resin, an isocyanate resin and hydraulic cement, and also describes that aggregates, color pigments and the like can be mixed. According to such a composition, excellent physical properties in terms of chemical resistance, strength and the like can be ensured, and a desired color can be imparted by selecting the type of color pigment.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the above-mentioned patent document, the pigment is mixed into the composition in powder form. Therefore, even if a colored pigment is mixed into the composition of the above-mentioned patent document, uneven coloring and other issues are likely to occur in the resulting film, which may result in insufficient color uniformity and finish quality.

[0006] The present invention has been made in view of the above-mentioned problems, and aims to provide a curable composition that can be colored to a desired shade and can form a coating with excellent color uniformity, finish, and other properties. [Means for solving the problem]

[0007] To solve these problems, the inventors, after diligent research, conceived of a curable composition having a main component (1) containing a polyol compound, a surfactant, and water, a curing agent (2) containing a polyisocyanate compound, a powder component (3) containing cement, and a specific coloring liquid (4), and thus completed the present invention.

[0008] In other words, the present invention has the following features. 1. A curable composition comprising a main component (1) containing a polyol compound, a surfactant, and water, a curing agent (2) containing a polyisocyanate compound, a powder component (3) containing cement, and a coloring liquid (4), The above coloring solution (4) contains a coloring pigment and a phenyl alkyl sulfonate. A curable composition characterized by the following features. 2. The curable composition according to 1, characterized in that the main component (1) above contains castor oil polyol as the polyol. 3. The curable composition according to 1. or 2., characterized in that the main component (1) contains a nonionic surfactant. [Effects of the Invention]

[0009] The curable composition of the present invention can be colored to a desired shade, and a coating with excellent color uniformity and finish properties can be formed, thereby enhancing aesthetic appeal. The composition of the present invention can also exhibit excellent performance in terms of chemical resistance and strength. [Modes for carrying out the invention]

[0010] The following describes embodiments for carrying out the present invention.

[0011] The curable composition of the present invention comprises a main component (1), a curing agent (2), a powder component (3), and a coloring liquid (4).

[0012] Of these, the main component (1) includes a polyol compound, a surfactant, and water.

[0013] The polyol compound in the main component (1) acts as a binder. Examples of polyol compounds include polyester polyols, polyether polyols, acrylic polyols, castor oil polyols, amine-modified polyols, epoxy-modified polyols, silicone-modified polyols, fluorine-modified polyols, polydiene polyols, and cellulose compounds, which can be used individually or in combination of two or more.

[0014] Examples of polyester polyols include condensation polymers of polyhydric alcohols and polyhydric carboxylic acids; ring-opening polymers of cyclic esters (lactones); and reaction products of three components: polyhydric alcohols, polyhydric carboxylic acids, and cyclic esters.

[0015] Examples of polyhydric alcohols include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, trimethylene glycol, triethylene glycol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 1,3-tetramethylenediol, 1,4-tetramethylenediol, 1,6-hexanediol, 1,3-tetramethylenediol, 2-methyl-1,3-trimethylenediol, 1,5-pentamethylenediol, trimethylpentanediol, 2,2,4-trimethyl-1,3-pentanediol, neopentyl glycol, cyclohexanediol, 2-butyl-2-ethyl-1,3-propanediol, 1,6-hexamethylenediol, and 3-methyl-1,5-pentamethylenediol. Examples include methylol, 2,4-diethyl-1,5-pentamethylenediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, metaxylene glycol, paraxylene glycol, bishydroxyethoxybenzene, bishydroxyethyl terephthalate, glycerin, diglycerin, trimethylolpropane, ditrimethylolpropane, trimethylolethane, ester glycols, cyclohexanediols (1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, etc.), bisphenols (bisphenol A, etc.), sugar alcohols (xylitol, sorbitol, etc.), pentaerythritol, dipentaerythritol, 2-methylolpropanediol, ethoxylated trimethylolpropane, etc.

[0016] Examples of polycarboxylic acids include aliphatic dicarboxylic acids such as malonic acid, maleic acid, maleic anhydride, succinic acid, glutaric acid, adipic acid, suberic acid, azelaic acid, sebacic acid, and dodecanedionic acid; Alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid; Examples include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, orthophthalic acid, phthalic anhydride, terephthalic acid, 2,6-naphthalenedicarboxylic acid, paraphenylenedicarboxylic acid, and trimellitic acid.

[0017] Examples of cyclic esters in ring-opening polymers include propiolactone, β-methyl-δ-valerolactone, and ε-caprolactone. In the reaction product of the three components, the polyhydric alcohol, polyhydric carboxylic acid, and cyclic ester can be those exemplified above.

[0018] Examples of polyether polyols include polyalkylene glycols such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyethylene glycol monoalkyl ether, and polypropylene glycol monoalkyl ether, as well as (alkylene oxide-other alkylene oxide) copolymers containing multiple alkylene oxides as monomer components, such as ethylene oxide-propylene oxide copolymers.

[0019] Examples of acrylic polyols include hydroxyl group-containing alkyl esters obtained by polymerizing and copolymerizing monomers containing hydroxyl group-containing monomers such as 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 5-hydroxypentyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-chloro-2-hydroxypropyl (meth)acrylate, 2-hydroxy-2-methylpropyl (meth)acrylate, glycerol mono(meth)acrylate, polyethylene glycol mono(meth)acrylate, polypropylene glycol (meth)acrylate, caprolactone-modified (meth)acrylic acid ester, and N-hydroxyethylacrylamide; Monoesters of the above-mentioned polyether polyol and an unsaturated carboxylic acid such as (meth)acrylic acid; Monoesterified or diesterified compounds of acid anhydride group-containing monomers such as maleic anhydride and glycols such as ethylene glycol, propylene glycol, butylene glycol, and 1,6-hexanediol; Hydroxyalkyl vinyl ethers such as hydroxyethyl vinyl ether; allyl alcohol and the like may be mentioned.

[0020] Examples of the castor oil polyol include a reaction product of castor oil or a castor oil fatty acid (including ricinoleic acid and hydrogenated castor oil fatty acid) and the above-mentioned polyhydric alcohol or the above-mentioned polyether polyol, and the like.

[0021] Examples of the amine-modified polyol include those obtained by adding an amine compound to the above-mentioned polyester polyol, the above-mentioned polyether polyol, or the above-mentioned acrylic polyol, those obtained by adding an amine compound during the production of the above-mentioned polyester polyol, the above-mentioned polyether polyol, or the above-mentioned acrylic polyol, and the like. In the present invention, it is particularly preferable to use an amine-modified polyether polyol obtained by adding an amine compound to a cyclic ether such as ethylene oxide, propylene oxide, isobutylene oxide, 1,2-epoxybutane, or 2,3-epoxybutane.

[0022] Examples of the amine compound include aliphatic amine compounds, saturated cyclic amine compounds, aromatic amine compounds, and the like. Examples of the aliphatic amine compound include ethylenediamine, propylenediamine, butylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, and the like. Examples of the saturated cyclic amine compound include N-aminomethylpiperazine, N-(2-aminoethyl)piperazine, and the like. Examples of the aromatic amine compound include 2,4-toluenediamine, 2,6-toluenediamine, diethyltoluenediamine, 4,4'-diaminodiphenylmethane, p-phenylenediamine, o-phenylenediamine, naphthalenediamine, and the like. These may be used singly or in combination of two or more.

[0023] In the present invention, it is particularly preferable to include castor oil polyol as the polyol compound. Including castor oil polyol can enhance effects such as uniform coloring and finish. The reasons for these effects are not limited to the following, but it is presumed that the good compatibility of castor oil polyol with alkyl sulfonic acid phenyl ester contained in the coloring solution (4) contributes to this. The polyol compound in the main component (1) preferably contains 80% by mass or more of castor oil polyol, more preferably 90% by mass or more, and even more preferably 95% by mass or more.

[0024] The hydroxyl value of the polyol compound is preferably 50 to 500 mg KOH / g, more preferably 100 to 400 mg KOH / g, and even more preferably 130 to 350 mg KOH / g. A hydroxyl value within this range is favorable in terms of curability, finish, and other properties. Furthermore, the number of hydroxyl functional groups in one molecule of the polyol compound is preferably 2.0 to 5.0, more preferably 2.5 to 4.0. A number of functional groups within this range is favorable in terms of finish, and other properties. In this invention, "α to β" is synonymous with "α or greater and β or less".

[0025] Examples of surfactants in the main component (1) include nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants. Among these, in the present invention, an embodiment containing a nonionic surfactant is preferred in terms of improving color uniformity and finish.

[0026] Nonionic surfactants are not particularly limited in type, but examples include polyoxyethylene alkylaryl ethers such as polyoxyethylene nonylphenyl ether and polyoxyethylene octylphenyl ether; polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, and polyoxyethylene oleyl ether; and others such as polyoxyethylene sorbitan fatty acid esters, polyoxyethylene fatty acid esters, and ethylene oxide-propylene oxide copolymers. These can be used individually or in combination of two or more.

[0027] Nonionic surfactants with an HLB of 9 or higher are preferred, those with an HLB of 10 to 20 are more preferred, and those with an HLB of 12 to 18 are even more preferred. By using nonionic surfactants having such an HLB, the uniformity of coloring, finish, etc., can be further improved. HLB is an abbreviation for hydrophilic-lipophilic balance, and is a numerical representation of the ratio of hydrophilicity to lipophilicity of an amphiphilic substance, and is specifically calculated using Griffin's formula.

[0028] The ratio of nonionic surfactant is preferably 0.01 to 10 parts by mass, more preferably 0.1 to 5 parts by mass, and even more preferably 0.3 to 3 parts by mass, per 100 parts by mass of the polyol compound, based on solid content. With such a ratio, sufficient effects can be obtained in terms of color uniformity, finish, etc.

[0029] The water in the main component (1) contributes to the curing reaction when the main component (1), curing agent (2), powder component (3), and coloring liquid (4) are mixed. The ratio of water is preferably 20 to 200 parts by mass, more preferably 30 to 150 parts by mass, per 100 parts by mass of the solid content of the polyol compound. This mixing ratio allows for sufficient effects in terms of curability, strength, etc.

[0030] The main component (1) can be manufactured by uniformly mixing the above-mentioned polyol compound, surfactant, and water using conventional methods. In this process, other components such as plasticizers, basic compounds, defoamers, reaction regulators, water-reducing agents, fibers, preservatives, anti-algal agents, antifungal agents, and silane coupling agents may be mixed into the main component (1) as needed.

[0031] Among these, plasticizers that can be used include, for example, phthalate compounds, adipic acid compounds, sebatic acid compounds, phosphoric acid compounds, and alkyl sulfonic acid ester compounds. Specifically, examples of phthalate compounds include di(n-butyl) phthalate, bis(2-ethylhexyl) phthalate, diisononyl phthalate, and butyl benzyl phthalate. Examples of adipic acid compounds include di(n-butyl) adipate and bis(2-ethylhexyl) adipate; examples of sebatic acid compounds include dibutyl sebatate; examples of fumarate compounds include dibutyl fumarate; examples of phosphate compounds include tricresyl phosphate and cresyl diphenyl phosphate; examples of alkyl sulfonic acid ester compounds include phenyl decanesulfonate, phenyl undecanesulfonate, phenyl dodecanesulfonate, phenyl tridecanesulfonate, phenyl tetradecanesulfonate, phenyl pentadecanesulfonate, cresyl pentadecanesulfonate, phenyl hexadecanesulfonate, phenyl heptadecanesulfonate, phenyl octadecanesulfonate, phenyl nonadecanesulfonate, and phenyl eicosandecylsulfonate. One or more of these can be used as plasticizers. The mixing ratio of the plasticizer is preferably 20 to 200 parts by mass, more preferably 30 to 150 parts by mass, per 100 parts by mass of the solid content of the polyol compound.

[0032] Examples of basic compounds that can be used include ammonia, alkylamines, alkanolamines, alkali metal salts, and alkali metal silicates. Examples of alkylamines include monoethylamine, diethylamine, triethylamine, isopropylamine, and diisopropylamine. Examples of alkanolamines include aminoethanol, aminopropanol, N,N-dimethylethanolamine, N,N-diethylethanolamine, N-methylethanolamine, and N-methyldiethanolamine. Examples of alkali metal salts that can be used include alkali metal hydroxides, carbonates, and bicarbonates. Specifically, examples include lithium hydroxide, sodium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide, iron hydroxide, potassium carbonate, potassium bicarbonate, sodium carbonate, and sodium bicarbonate. These can be used individually or in combination of two or more. The mixing ratio of the basic compounds is preferably 0.001 to 2 parts by mass, more preferably 0.01 to 1 part by mass, per 100 parts by mass of the solid content of the polyol compound, in terms of curability and finish.

[0033] Examples of defoaming agents include silicone-based defoaming agents and non-silicone-based defoaming agents. Of these, silicone-based defoaming agents contain polysiloxane compounds or modified polysiloxane compounds. Examples of silicone-based defoaming agents include those containing one or more selected from polysiloxane compounds, polyether-modified siloxane compounds, alkyl-modified siloxane compounds, fluorine-modified siloxane compounds, amino-modified siloxane compounds, higher fatty acid-modified siloxane compounds, alcohol-modified siloxane compounds, carboxyl-modified siloxane compounds, etc. On the other hand, non-silicone-based defoaming agents do not contain polysiloxane compounds or modified polysiloxane compounds. Examples of non-silicone-based defoaming agents include those containing one or more selected from higher alcohol compounds, derivatives of higher alcohol compounds, fatty acid compounds, derivatives of fatty acid compounds, paraffin compounds, acetylene glycol compounds, mineral oil compounds, acrylic polymer compounds, vinyl polymer compounds, polyolefin compounds, etc. These can be used individually or in combination of two or more. In the present invention, non-silicone defoaming agents are preferred in terms of uniform coloring and finish. As non-silicone defoaming agents, one or more polymer-based defoaming agents selected from acrylic polymer compounds, vinyl polymer compounds, polyolefin compounds, etc., are preferred. The mixing ratio of the defoaming agent is preferably 0.1 to 20 parts by mass, more preferably 1 to 15 parts by mass, per 100 parts by mass of the solid content of the polyol compound.

[0034] The curing agent (2) of the present invention contains a polyisocyanate compound. The polyisocyanate compound is a compound having two or more isocyanate groups in one molecule, and specifically includes, for example, 4,4-diphenylmethane diisocyanate (pure-MDI), polymeric MDI, xylylene diisocyanate (XDI), tolylene diisocyanate, hexamethylene diisocyanate (HMDI), isophorone diisocyanate (IPDI), hydrogenated XDI, hydrogenated MDI, etc., or derivatives of these obtained by allophanation, biuretation, dimerization (uretidioneation), trimerization (isocyanurateation), adductation, carbodiimideation, etc. Isocyanate-terminated prepolymers obtained by the reaction of isocyanate and polyol can also be used. One or more of these can be used as the polyisocyanate compound.

[0035] The curing agent (2) preferably contains 50% by mass or more of a polyisocyanate compound, more preferably 80% by mass or more, and even more preferably 90% by mass or more. An embodiment in which the curing agent (2) consists of a polyisocyanate compound is also preferred.

[0036] The polyisocyanate compound of the curing agent (2) should be mixed in an amount preferably 50 to 800 parts by mass, more preferably 100 to 500 parts by mass, relative to 100 parts by mass of the solid content of the polyol compound of the main component (1).

[0037] The powder component (3) contains cement. Examples of cement include Portland cement such as ordinary Portland cement, rapid-hardening Portland cement, ultra-rapid-hardening Portland cement, moderate-heat Portland cement, sulfate-resistant Portland cement, and white Portland cement, as well as alumina cement, ultrafast-setting cement, expansive cement, acidic phosphate cement, silica cement, blast furnace cement, fly ash cement, and Kiens cement. These can be used individually or in mixtures of two or more. Among these, Portland cement is preferred.

[0038] The cement of powder component (3) should be mixed in an amount preferably between 100 and 1000 parts by mass, more preferably between 200 and 800 parts by mass, relative to 100 parts by mass of the solid content of the polyol compound of the main component (1).

[0039] The powder component (3) may include fine aggregate in addition to cement. Including such fine aggregate can improve the strength and thickness of the coating. Examples of fine aggregate include crushed natural stone, ceramic powder, silica sand, ceramic powder, rubber granules, metal granules, or materials with colored coatings on their surfaces. The particle size of the fine aggregate is preferably 50 μm or more and less than 1000 μm, more preferably 100 to 980 μm. The fine aggregate should be mixed in an amount of preferably 3000 parts by mass or less, more preferably 200 to 3000 parts by mass, and even more preferably 500 to 2500 parts by mass, per 100 parts by mass of the solid content of the polyol compound of the main component (1).

[0040] The powder component (3) may also contain coarse aggregate with a larger particle size than the fine aggregate. By including coarse aggregate, fine irregularities can be formed on the surface of the coating, providing anti-slip properties. The particle size of the coarse aggregate is preferably 1 mm or more, and more preferably 1 to 10 mm. The particle size of the fine aggregate and coarse aggregate is measured by sieving using a metal mesh sieve as specified in JIS Z8801-1:2019. In addition, the powder component (3) may contain carbon dioxide absorbents, etc. Examples of carbon dioxide absorbents include calcium oxide, magnesium oxide, barium oxide, sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium hydroxide, barium hydroxide, magnesium hydroxide, calcium silicate, barium silicate, and sodium silicate.

[0041] In this invention, in addition to the main agent (1), curing agent (2), and powder component (3) described above, a coloring liquid (4) is an essential component. The coloring liquid (4) in this invention contains a coloring pigment and alkyl sulfonate phenyl ester. In this invention, by using such a coloring liquid (4), when the main agent (1), curing agent (2), powder component (3), and coloring liquid (4) are mixed and applied as paint, excellent performance in terms of color uniformity and finish can be achieved. The reasons for achieving such effects are not limited to the following, but it is presumed that the alkyl sulfonate phenyl ester in the coloring liquid (4) contributes to the dispersion stability of the coloring pigment, and that the alkyl sulfonate phenyl ester is easily compatible with the main agent (1), etc.

[0042] Examples of coloring pigments in the coloring solution (4) include titanium dioxide, zinc oxide, carbon black, graphite, black iron oxide, iron-manganese composite oxide, iron-copper-manganese composite oxide, iron-chromium composite oxide, iron-chromium-cobalt composite oxide, copper-chromium composite oxide, copper-manganese-chromium composite oxide, copper-magnesium composite oxide, bismuth-manganese composite oxide, red iron oxide, molybdate orange, permanent red, permanent carmine, anthraquinone red, perylene red, quinacridone red, yellow iron oxide, titanium yellow, first yellow, benzoimidazolone yellow, chromium green, chromium oxide green, cobalt green, phthalocyanine green, ultramarine, Prussian blue, cobalt blue, phthalocyanine blue, quinacridone violet, dioxazine violet, etc. These can be used individually or in combination of two or more. By including such coloring pigments, it is possible to prepare a curable composition to a desired color. The average particle size of the coloring pigment is preferably 2 μm or less, more preferably 0.01 to 1 μm. The average particle size of the coloring pigment is a value measured by a laser diffraction particle size distribution analyzer.

[0043] As alkylsulfonic acid phenyl esters, for example, compounds represented by the following general formula (I) can be used.

[0044] [ka]

[0045] Examples of alkyl sulfonate phenyl esters represented by such compounds include decanesulfonate phenyl ester, undecanesulfonate phenyl ester, dodecanesulfonate phenyl ester, tridecanesulfonate phenyl ester, tetradecanesulfonate phenyl ester, pentadecanesulfonate phenyl ester, hexadecanesulfonate phenyl ester, heptadecanesulfonate phenyl ester, octadecanesulfonate phenyl ester, nonadecanesulfonate phenyl ester, and eicosandecylsulfonate phenyl ester. These can be used individually or in combination of two or more.

[0046] The ratio of coloring pigment in the coloring solution (4) is preferably 30 to 80% by mass, more preferably 40 to 70% by mass. The ratio of alkyl sulfonate phenyl ester in the coloring solution (4) is preferably 20 to 70% by mass, more preferably 30 to 60% by mass.

[0047] Furthermore, the coloring pigment of the coloring solution (4) should be mixed in a range of preferably 4 to 80 parts by mass, more preferably 6 to 60 parts by mass, per 100 parts by mass of the solid content of the polyol compound of the main component (1). The alkyl sulfonate phenyl ester of the coloring solution (4) should be mixed in a range of preferably 2 to 60 parts by mass, more preferably 3 to 50 parts by mass, per 100 parts by mass of the solid content of the polyol compound of the main component (1).

[0048] The coloring solution (4) may also contain additives as needed, such as defoaming agents, reaction modifiers, water-reducing agents, extender pigments, fibers, preservatives, algaecides, and fungicides.

[0049] The curable composition of the present invention is distributed with the main component (1), curing agent (2), powder component (3), and coloring liquid (4) stored in separate packages, and these can be mixed at the time of use (immediately before painting). Two or more coloring liquids (4) with different colors can also be prepared. In addition, a curing accelerator (5), etc., can be prepared separately and mixed at the time of use.

[0050] The curable composition of the present invention can form a coating by mixing the above components at the time of use and applying the mixture to a substrate. The composition of the present invention exhibits excellent physical properties such as uniform coloring, finish, chemical resistance, and strength, and is therefore particularly preferred as a material to be applied to floor surfaces such as concrete.

[0051] During painting, various methods can be employed, such as trowel application, pouring, roller application, and spraying. Aggregates can also be scattered on the painted surface before drying. The thickness after hardening is preferably 0.5 to 12 mm, more preferably 1 to 10 mm. It is also possible to apply the paint in multiple coats to achieve this predetermined thickness. Painting and subsequent drying should preferably be carried out at room temperature (0-40°C). [Examples]

[0052] The following examples illustrate the features of the present invention. However, the present invention is not limited to the examples provided herein.

[0053] (Main ingredient) For the main component, a mixture of each ingredient was prepared according to the formulation shown in Table 1. The raw materials used for the main component are as follows:

[0054] • Resin 1: Castor oil polyol (hydroxyl value 160 KOH mg / g, solids content 100% by mass) • Resin 2: Castor oil polyol (hydroxyl value 320 KOH mg / g, solids content 100% by mass) • Resin 3: Polyether polyol (hydroxyl value 450 KOH mg / g, solids content 100% by mass) • Surfactant 1: Nonionic surfactant (polyoxyethylene alkyl ether, HLB 9.7, solids content 100% by mass) • Surfactant 2: Nonionic surfactant (polyoxyethylene alkyl ether, HLB 13.4, solids content 100% by mass) • Surfactant 3: Nonionic surfactant (polyoxyethylene alkyl ether, HLB 15.0, solids content 100% by mass) • Plasticizer 1: Diisononyl phthalate • Plasticizer 2: Phenyl alkylsulfonate (compound represented by the general formula (I) above) • Additive 1: Non-silicone antifoaming agent (acrylic polymer compound) • Additive 2: Silicone-based defoaming agent (polysiloxane compound)

[0055] [Table 1]

[0056] (Hardening agent) As the curing agent 1, a polyisocyanate compound (polymeric MDI, NCO content 31% by mass) was prepared.

[0057] (Powdered components) As powder component 1, a mixture of cement (Portland cement), fine aggregate (white silica sand, particle size 0.2-0.8 mm), and carbon dioxide absorbent (calcium hydroxide) was prepared (mass ratio 30:66:4).

[0058] (Colored liquid) The following coloring solutions were prepared: • Coloring solution 1: A mixture of coloring pigment 1 (titanium dioxide), coloring pigment 2 (chromium oxide green), and alkyl sulfonate phenyl ester (a compound represented by the general formula (I) mentioned above) (mass ratio 10:50:40). • Coloring solution 2: A mixture of coloring pigment 1 (titanium dioxide), coloring pigment 3 (yellow iron oxide), and alkyl sulfonate phenyl ester (same as above) (mass ratio 55:10:35). • Coloring solution 3: A mixture of coloring pigment 1 (titanium dioxide), coloring pigment 2 (chromium oxide green), coloring pigment 4 (carbon black), and alkyl sulfonate phenyl ester (same as above) (mass ratio 2:42:1:55). • Coloring solution 4: A mixture of coloring pigment 1 (titanium dioxide), coloring pigment 2 (chromium oxide green), coloring pigment 4 (carbon black), and diisononyl phthalate (mass ratio 2:42:1:55).

[0059] (Curable composition) A curable composition was prepared by mixing the main component, curing agent, powder component, and coloring liquid in a mass ratio of 10:10:50:1. The combinations of main component, curing agent, powder component, and coloring liquid used in each curable composition are shown in Table 2.

[0060] (test) Each of the resulting curable compositions was tested for color uniformity and finish quality using the following method.

[0061] For each curable composition obtained by the above method, the left half of a slate board was troweled to a thickness of 4 mm after curing. After 5 minutes, the remaining right half was troweled, and the entire surface was smoothed with a trowel. After drying and curing for 72 hours, the uniformity of the color of the coating was visually checked. The evaluation was performed on a three-point scale (Excellent: A > B > C: Poor), with "A" indicating a uniform coating without color unevenness and excellent finish, and "C" indicating color unevenness. Painting and curing were carried out under standard conditions (temperature 23°C, relative humidity 50%). The test results are shown in Table 2.

[0062] [Table 2]

Claims

1. A curable composition comprising a main component (1) containing a polyol compound, a surfactant, and water, a curing agent (2) containing a polyisocyanate compound, a powder component (3) containing cement, and a coloring liquid (4), The above coloring solution (4) contains a coloring pigment and a phenyl alkyl sulfonate. A curable composition characterized by the following features.

2. The curable composition according to claim 1, characterized in that the main component (1) above comprises castor oil polyol as the polyol.

3. The curable composition according to claim 1 or 2, characterized in that the main component (1) contains a nonionic surfactant.

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