Curable composition

Abstract

To provide a curable composition that allows improved stability and ensures excellent curability and finishability.SOLUTION: A curable composition contains a dispersion (L) containing a polyol compound (a), surfactants (b), and water (c), an isocyanate compound (M), and cement (N). The surfactants (b) include a combination of two specific surfactants ((b1) and (b2)).SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a novel cured composition. The composition of the present invention is particularly suitable as a covering material for floor surfaces. [Background technology]

[0002] Conventionally, various materials such as urethane-based, epoxy-based, and acrylic-based materials have been used as floor covering materials. The use of such materials not only protects the floor surface but also allows the floor surface to be given a desired color. However, when high performance is required in terms of heat resistance, chemical resistance, strength, etc., the current situation is that it is difficult for the above-mentioned materials to fully satisfy these requirements.

[0003] Patent Document 1 describes a polyurethane cement composition containing hydraulic cement, water, a polyol, and an isocyanate compound, and further describes a method of preparing a polyol emulsion using water and a surfactant. Patent Document 2 also describes a urethane cement composition containing a dispersion liquid (A), a compound (B) having an isocyanate group, and hydraulic cement (C), and describes that the dispersion liquid (A) contains (b) an active hydrogen compound (polyol) having no nitrogen atoms, (c) water, and further a surfactant. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-058997 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-206354 Summary of the Invention [Problem to be solved by the invention]

[0005] The compositions described in Patent Documents 1 and 2 are stored in at least three components: a first component containing a polyol, a second component containing an isocyanate, and a third component containing cement. When applying the composition to a floor or the like, these three components are mixed together and used. The first component is mixed with a polyol, water, and a surfactant to improve stability. However, the above techniques are insufficient in terms of curing properties and finish, and further development is required.

[0006] The object of the present invention is to solve the above problems and to ensure practically useful performance in terms of stability, curing properties and finish. [Means for solving the problem]

[0007] In order to solve such problems, the present inventors have conducted extensive research and have come up with the idea of ​​using two specific surfactants ((b1) and (b2)) in combination as the surfactant (b) in a curable composition containing a dispersion (L) containing a polyol compound (a), a surfactant (b), and water (c), an isocyanate compound (M), and cement (N), thereby completing the present invention.

[0008] That is, the present invention has the following features. 1. A curable composition comprising a dispersion (L) containing a polyol compound (a), a surfactant (b), and water (c), an isocyanate compound (M), and cement (N), The surfactant (b) includes a surfactant (b1) having an HLB of less than 9 and a surfactant (b2) having an HLB of 9 or more. The mixing ratio of component (b1) to component (b2) is 1:0.3 to 98:2 by weight. A curable composition characterized by: 2. The polyol compound (a) is one or more selected from castor oil polyols and polyether polyols, and has a hydroxyl value of 100 mg KOH / g or more and 500 mg KOH / g or less; The dispersion liquid (L) further contains a polyhydric alcohol, The curable composition according to item 1, wherein the polyhydric alcohol is one or more selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, neopentyl glycol, trimethylolethane, trimethylolpropane, glycerin, pentaerythritol, 1,6-hexanediol, ester glycol, 1,4-cyclohexanedimethanol, and 1,3-butanediol. [Effects of the Invention]

[0009] The composition of the present invention can ensure excellent performance in terms of dispersibility, curability and finish. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described.

[0011] The curable composition of the present invention contains a dispersion (L) (hereinafter also referred to as "component (L)"), an isocyanate compound (M) (hereinafter also referred to as "component (M)"), and a cement (N) (hereinafter also referred to as "component (N)"). Of these, the dispersion liquid (L) contains at least a polyol compound (a) (hereinafter also referred to as "component (a)"), a surfactant (b) (hereinafter also referred to as "component (b)"), and water (c) (hereinafter also referred to as "component (c)"), and the surfactant (b) is characterized by containing a surfactant (b1) (hereinafter also referred to as "component (b1)") having an HLB of less than 9 and a surfactant (b2) (hereinafter also referred to as "component (b2)") having an HLB of 9 or more. HLB is an abbreviation for hydrophilic-lipophilic balance, which is a numerical representation of the strength ratio of hydrophilicity to lipophilicity of an amphiphilic substance, and can be calculated using Griffin's formula.

[0012] Component (a) of the present invention acts as a binder. Examples of component (a) 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, and these can be used alone or in combination of two or more.

[0013] Examples of polyester polyols include condensation polymers of polyhydric alcohols and polycarboxylic acids; ring-opening polymers of cyclic esters (lactones); and reaction products of three components: polyhydric alcohols, polycarboxylic acids, and cyclic esters.

[0014] 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 of suitable esters include ethanol, 2,4-diethyl-1,5-pentamethylenediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, meta-xylene glycol, para-xylene glycol, bishydroxyethoxybenzene, bishydroxyethyl terephthalate, glycerin, diglycerin, trimethylolpropane, ditrimethylolpropane, trimethylolethane, ester glycol, cyclohexanediols (1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, etc.), bisphenols (bisphenol A, etc.), sugar alcohols (xylitol, sorbitol, etc.), pentaerythritol, dipentaerythritol, 2-methylolpropanediol, and ethoxylated trimethylolpropane.

[0015] 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 dodecanedioic acid; Alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid; Examples thereof 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.

[0016] In the ring-opening polymer of a cyclic ester, examples of the cyclic ester include propiolactone, β-methyl-δ-valerolactone, and ε-caprolactone. In the reaction product of the three components, the polyhydric alcohol, polycarboxylic acid, and cyclic ester may be those exemplified above.

[0017] 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 copolymer.

[0018] Examples of acrylic polyols include hydroxyl group-containing alkyl esters obtained by polymerizing or copolymerizing a monomer containing a hydroxyl group-containing monomer 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; a monoester of the above polyether polyol with an unsaturated carboxylic acid such as (meth)acrylic acid; Monoesters or diesters of an acid anhydride group-containing monomer such as maleic anhydride with glycols such as ethylene glycol, propylene glycol, butylene glycol, 1,6-hexanediol, etc.; hydroxyalkyl vinyl ethers such as hydroxyethyl vinyl ether; Allyl alcohol and the like.

[0019] Examples of castor oil polyols include reaction products of castor oil or castor oil fatty acids (including ricinoleic acid and hydrogenated castor oil fatty acids) with the above polyhydric alcohols or the above polyether polyols.

[0020] Examples of amine-modified polyols include those obtained by adding an amine compound to the above-mentioned polyester polyols, polyether polyols, and acrylic polyols, and those obtained by adding an amine compound during the production of the above-mentioned polyester polyols, polyether polyols, and acrylic polyols. 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.

[0021] Examples of amine compounds include aliphatic amine compounds, saturated cyclic amine compounds, and aromatic amine compounds. Examples of aliphatic amine compounds include ethylenediamine, propylenediamine, butylenediamine, hexamethylenediamine, diethylenetriamine, and triethylenetetramine. Examples of saturated cyclic amine compounds include N-aminomethylpiperazine and N-(2-aminoethyl)piperazine. Examples of aromatic amine compounds include 2,4-toluenediamine, 2,6-toluenediamine, diethyltoluenediamine, 4,4'-diaminodiphenylmethane, p-phenylenediamine, o-phenylenediamine, and naphthalenediamine. These compounds can be used alone or in combination of two or more.

[0022] In the present invention, it is particularly preferred that component (a) contains at least one selected from castor oil polyols and amine-modified polyols. By including at least one selected from castor oil polyols and amine-modified polyols, sufficient effects can be obtained in curing properties and finish properties.

[0023] The hydroxyl value of component (a) is preferably 50 mgKOH / g or more and 500 mgKOH / g or less, more preferably 100 mgKOH / g or more and 400 mgKOH / g or less, and even more preferably 130 mgKOH / g or more and 350 mgKOH / g or less. If the hydroxyl value of component (a) is within this range, it is suitable in terms of curability, finish, etc. Furthermore, the number of functional hydroxyl groups in one molecule of component (a) is preferably 2.0 or more and 5.0 or less, more preferably 2.5 or more and 4.0 or less. If the number of functional groups in component (a) is within this range, it is suitable in terms of finish and other properties.

[0024] The component (b) of the present invention is characterized by containing a surfactant (b1) (hereinafter also referred to as "component (b1)") having an HLB of less than 9 (preferably 8 or less, more preferably 7 or less, and even more preferably 1 to 6), and a surfactant (b2) (hereinafter also referred to as "component (b2)") having an HLB of 9 or more (preferably 10 or more, and even more preferably 11 to 18). By including such components (b1) and (b2) in the component (L), it is possible to obtain a composition that has excellent dispersion stability of the component (L), and also excellent dispersion stability when the components (L), (M), and (N) are mixed, as well as excellent curability and finish.

[0025] The component (b) is not particularly limited as long as it is within the above-mentioned range, and examples thereof include polyoxyalkylene oxides, polyoxyalkylene alkyl ethers, sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, glycerin fatty acid esters or alkylene oxide adducts thereof, sucrose fatty acid esters or alkylene oxide adducts thereof, polyalkylene castor oil, etc.

[0026] Examples of polyoxyalkylene oxides include polyoxyethylene oxide, polyoxypropylene oxide, polyoxybutylene oxide, etc., or random or block polymers of two or more of these. The number of repeating units is not particularly limited, but may be about 2 or more and 100 or less.

[0027] Polyoxyalkylene alkyl ethers are ethers having a polyoxyalkylene chain and an alkyl group. Examples of polyoxyalkylene chains include polyoxyethylene chains, polyoxypropylene chains, and polyoxybutylene chains, and these may be chains in which one or more types are randomly or block-added. The number of repeating units is not particularly limited, but may be about 2 to 100. The alkyl group may be an alkyl group having 1 to 24 carbon atoms, and is not particularly limited to linear, branched, cyclic, saturated, unsaturated, etc. Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, an octadecyl group, a nonadecyl group, an icosyl group, a henicosyl group, a docosyl group, a tricosyl group, a tetracosyl group, an isopropyl group, an isobutyl group, a t-butyl group, an isopentyl group, a neopentyl group, a 2-ethyl Examples of such alkyl groups include methyl hexyl, isooctyl, 2,3,5-trimethylhexyl, 4-ethyl-5-methyloctyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, phenyl, methylphenyl, ethylphenyl, propylphenyl, isopropylphenyl, butylphenyl, pentylphenyl, hexylphenyl, heptylphenyl, octylphenyl, nonylphenyl, naphthyl, oleyl, and linoleyl groups.

[0028] Examples of sorbitan fatty acid esters include sorbitan monocaprylate, sorbitan monolaurate, sorbitan monomyristate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monoisostearate, sorbitan monooleate, sorbitan monobehenate, sorbitan dilaurate, sorbitan dimyristate, sorbitan dipalmitate, sorbitan distearate, sorbitan diisostearate, sorbitan dioleate, and sesquicaprylate. Examples of suitable fatty acids include sorbitan hydroxybenzoate, sorbitan sesquilaurate, sorbitan sesquimyristate, sorbitan sesquipalmitate, sorbitan sesquistearate, sorbitan sesquiisostearate, sorbitan sesquioleate, sorbitan trilaurate, sorbitan trimyristate, sorbitan tripalmitate, sorbitan tristearate, sorbitan triisostearate, sorbitan trioleate, sorbitan coconut oil fatty acid, and sorbitan olive oil fatty acid. Examples of the polyoxyalkylene sorbitan fatty acid esters include alkylene oxide adducts of the above sorbitan fatty acid esters with polyethylene oxide, polypropylene oxide, polybutylene oxide, and the like.

[0029] Examples of glycerin fatty acid esters include glyceryl monocaprylate, glyceryl monolaurate, glyceryl monomyristate, glyceryl monopalmitate, glyceryl monostearate, glyceryl monoisostearate, glyceryl monooleate, glyceryl monobehenate, glyceryl dilaurate, glyceryl dimyristate, glyceryl dipalmitate, glyceryl distearate, glyceryl diisostearate, glyceryl dioleate, sesquicaprylate, and the like. Examples of the glycerin fatty acid ester include glyceryl ester, glyceryl sesquilaurate, glyceryl sesquimyristate, glyceryl sesquipalmitate, glyceryl sesquistearate, glyceryl sesquiisostearate, glyceryl sesquioleate, glyceryl trilaurate, glyceryl trimyristate, glyceryl tripalmitate, glyceryl tristearate, glyceryl triisostearate, glyceryl trioleate, glyceryl coconut oil fatty acid, and glyceryl olivate fatty acid. As shown above, examples of the glycerin fatty acid ester include esters of glycerin monomers and mono- to tri-mer fatty acids, but other esters of dimer to decamer (preferably di- to tetra-mer) polyglycerin and mono- to tri-mer fatty acids can also be used. Examples of the polyoxyalkylene glycerin fatty acid esters include alkylene oxide adducts of the above glycerin fatty acid esters with polyethylene oxide, polypropylene oxide, polybutylene oxide, and the like.

[0030] Examples of sucrose fatty acid esters include sucrose laurate, sucrose myristate, sucrose palmitate, sucrose stearate, sucrose isostearate, and sucrose oleate. Examples of the polyoxyalkylene sucrose fatty acid esters include alkylene oxide adducts of the above sucrose fatty acid esters with polyethylene oxide, polypropylene oxide, polybutylene oxide, and the like.

[0031] Polyalkylene castor oil is a polyalkylene chain adduct of castor oil, and examples of the polyoxyalkylene chain include polyoxyethylene chain, polyoxypropylene chain, polyoxybutylene chain, etc., and one or more of these may be randomly or block-added. The number of repeating units is not particularly limited, but may be about 2 to 100. Furthermore, although not particularly limited, castor oils having one to three such polyalkylene chains added can be used.

[0032] The component (b1) is not particularly limited as long as it has an HLB value of less than 9, but it is particularly preferred to use one or more selected from sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, glycerin fatty acid esters or alkylene oxide adducts thereof, sucrose fatty acid esters or alkylene oxide adducts thereof, and polyalkylene castor oil.

[0033] The component (b2) is not particularly limited as long as it has an HLB of 9 or more, but it is particularly preferred to use one or more selected from polyoxyalkylene oxides and polyoxyalkylene alkyl ethers.

[0034] The mixing ratio of component (b) is preferably 0.01 to 10 parts by weight, more preferably 0.1 to 5 parts by weight, per 100 parts by weight of the solid content of component (a). The mixing ratio of components (b1) and (b2) in component (b) is preferably 50:50 to 98:2 (more preferably 60:40 to 95:5) by weight. By using such a mixing ratio, sufficient effects can be exhibited in terms of stability, curing properties, and finish properties.

[0035] The component (c) of the present invention is a component that, together with the component (b), enhances the stability of the component (L) and also contributes to the curing reaction when the components (M) and (N) are mixed. The mixing ratio of component (c) is preferably 20 to 200 parts by weight, more preferably 30 to 150 parts by weight, per 100 parts by weight of the solid content of component (a). By using such a mixing ratio, sufficient effects can be exhibited in terms of stability, curing properties, and finish properties.

[0036] Component (L) can be produced by uniformly mixing the above-mentioned components (a), (b), and (c), and, if necessary, other components, using a conventional method. In this case, additives such as plasticizers, polyhydric alcohols, basic compounds, pigments, antifoaming agents, reaction modifiers, water-reducing agents, fibers, preservatives, anti-algae agents, anti-mold agents, and silane coupling agents can also be mixed into dispersion liquid (L).

[0037] Examples of the plasticizer that can be used include phthalic acid compounds, adipic acid compounds, sebacic acid compounds, phosphoric acid compounds, alkyl sulfonic acid ester compounds, etc. Specific examples of the phthalic acid 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 sebacic acid compounds include dibutyl sebate; examples of fumaric acid compounds include dibutyl fumarate; examples of phosphoric acid compounds include tricresyl phosphate and cresyl diphenyl phosphate; and examples of alkylsulfonic acid ester compounds include decane sulfonate phenyl ester, undecane sulfonate phenyl ester, dodecane sulfonate phenyl ester, tridecane sulfonate phenyl ester, tetradecane sulfonate phenyl ester, pentadecane sulfonate phenyl ester, pentadecane sulfonate cresyl ester, hexadecanesulfonate phenyl ester, heptadecane sulfonate phenyl ester, octadecane sulfonate phenyl ester, nonadecanesulfonate phenyl ester, and icosane decyl sulfonate phenyl ester. These plasticizers may be used alone or in combination. In the present invention, the dispersion (L) contains a plasticizer, which further improves the stability of the dispersion (L), making it possible to stably obtain the effects of the present invention.

[0038] The mixing ratio of the plasticizer is preferably about 20 to 200 parts by weight (more preferably about 30 to 150 parts by weight) per 100 parts by weight of the solid content of component (a).

[0039] As the polyhydric alcohol, those mentioned above can be used, and it is particularly preferable to use one or more selected from ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, neopentyl glycol, trimethylolethane, trimethylolpropane, glycerin, pentaerythritol, 1,6-hexanediol, ester glycol, 1,4-cyclohexanedimethanol, and 1,3-butanediol. By including such a polyhydric alcohol, excellent effects can be obtained in terms of the stability, curing properties, finish, etc. of the component (L). The molecular weight of the polyhydric alcohol is preferably 250 or less, more preferably 50 or more and 220 or less. In addition, the polyhydric alcohol is preferably a compound that is easily soluble in water, and more preferably a compound whose solubility in water (20°C) is 20 g / 100 g or more, and even ∞.

[0040] The mixing ratio of the polyhydric alcohol is preferably 1 to 100 parts by weight, more preferably 3 to 70 parts by weight, and even more preferably 5 to 40 parts by weight, per 100 parts by weight of the solid content of component (a).Such a ratio provides sufficient effects in terms of stability, curability, finish, etc.

[0041] Examples of usable water-soluble basic compounds include ammonia, alkylamines, alkanolamines, alkali metal salts, and alkali metal siliconates. 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 usable alkali metal salts include alkali metal hydroxides, carbonates, and bicarbonates, specifically lithium hydroxide, sodium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide, iron hydroxide, potassium carbonate, potassium bicarbonate, sodium carbonate, and sodium bicarbonate. These compounds can be used alone or in combination of two or more.

[0042] The mixing ratio of the water-soluble basic compound is preferably 0.001 to 2 parts by weight, more preferably 0.01 to 1 part by weight, per 100 parts by weight of the solid content of component (a). If the ratio of the water-soluble basic compound is within this range, the stability of the dispersion (L) is sufficiently improved, which is preferable in terms of the expression of effects such as finish.

[0043] Various color pigments can be used as pigments, and color pigments can also be used in combination with extender pigments. Examples of color pigments include titanium oxide, zinc oxide, carbon black, black iron oxide, cobalt black, copper manganese iron black, red iron oxide, molybdate orange, permanent red, permanent carmine, anthraquinone red, perylene red, quinacridone red, yellow iron oxide, titanium yellow, fast yellow, benzimidazolone yellow, chrome green, cobalt green, phthalocyanine green, ultramarine blue, Prussian blue, cobalt blue, phthalocyanine blue, quinacridone violet, and dioxazine violet. Examples of extender pigments include heavy calcium carbonate, light calcium carbonate, kaolin, clay, diatomaceous earth, talc, and barium sulfate. The particle size of component (g) is preferably less than 50 μm (more preferably 0.1 μm to 30 μm).

[0044] By including such a pigment, it becomes possible to prepare the curable composition in a desired color. Furthermore, in the present invention, even when the dispersion (L) includes a pigment, the stability of the dispersion (L) can be sufficiently ensured, and the dispersion is also suitable in terms of color uniformity, color development, etc.

[0045] By appropriately selecting and mixing one or more of these pigments, it is possible to express a variety of color tones. The mixing ratio of the pigment is preferably 0.5 to 30 parts by weight, more preferably 1 to 20 parts by weight, per 100 parts by weight of component (a) in terms of solid content.

[0046] The component (M) of the present invention can be a compound having two or more isocyanate groups per molecule. Specific examples include 4,4-diphenylmethane diisocyanate (pure-MDI), polymeric MDI, xylylene diisocyanate (XDI), tolylene diisocyanate, hexamethylene diisocyanate (HMDI), isophorone diisocyanate (IPDI), hydrogenated XDI, hydrogenated MDI, etc., as well as derivatives thereof obtained by allophanation, biuretization, dimerization (uretidione formation), trimerization (isocyanuration), adductization, carbodiimidization, etc. Isocyanate-terminated prepolymers obtained by the reaction of isocyanate with polyol can also be used. As the isocyanate compound, one or more of these can be used. The (M) component may be mixed in an amount of preferably 50 to 800 parts by weight, more preferably 100 to 500 parts by weight, per 100 parts by weight of the solid content of the (a) component.

[0047] Examples of component (N) of the present invention include Portland cements such as ordinary Portland cement, high-early-strength Portland cement, ultra-high-early-strength Portland cement, moderate-heat Portland cement, sulfate-resistant Portland cement, and white Portland cement, as well as alumina cement, ultra-high-speed hardening cement, expansive cement, acidic phosphate cement, silica cement, blast-furnace cement, fly ash cement, and Keene's cement. These can be used alone or in combination of two or more. Among these, Portland cement is preferred. The (N) component may be mixed in an amount of preferably 100 to 1000 parts by weight, more preferably 200 to 800 parts by weight, per 100 parts by weight of the solid content of the (a) component.

[0048] In addition to the above components, the composition of the present invention can further contain fine aggregate, which can improve the strength and thickness of the coating film. Examples of fine aggregate include crushed natural stone, ceramic powder, silica sand, ceramic powder, rubber granules, metal granules, etc., or these with a colored coating on the surface. The particle size of the fine aggregate is usually about 0.05 mm or more and 1 mm or less. The fine aggregate may be mixed in an amount of preferably 200 to 2000 parts by weight, more preferably 500 to 1500 parts by weight, per 100 parts by weight of the solid content of component (a). In the present invention, by further mixing coarse aggregate having a particle size larger than that of the fine aggregate, fine irregularities can be formed on the surface of the coating, thereby imparting anti-slip properties. In addition, a carbon dioxide absorbent or the like can also be mixed. 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.

[0049] When the curable composition of the present invention is distributed, the dispersion (L), the isocyanate compound (M), and the cement (N) are stored in separate packages, and are mixed at the time of use. In addition, components such as fine aggregate, other coarse aggregate, and carbon dioxide absorbent are usually mixed with the above component (N) in the same package.

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

[0051] Various methods can be used for application, such as troweling, pouring, and spraying. Aggregates can also be scattered on the surface before drying. The thickness after hardening is preferably 0.5 mm to 12 mm, more preferably 1 mm to 10 mm. It is also possible to apply the coating in multiple separate coats within this thickness range. The coating and subsequent drying may usually be carried out at room temperature (0 to 40°C). [Example]

[0052] The following examples will be given to clarify the features of the present invention, but the present invention is not limited to these examples.

[0053] A dispersion was produced by uniformly mixing each L component according to the raw materials shown in Table 1 and the formulation shown in Table 2. The following tests were carried out on the dispersion. (1) Stability test 1 After the dispersion was produced, it was immediately sealed in a plastic container and left to stand for 24 hours under standard conditions (temperature 23°C, relative humidity 50%), after which the appearance of the dispersion was visually observed. Evaluation was carried out on a four-point scale (excellent: A>B>C>D: poor), with "A" indicating no abnormalities such as separation or sedimentation, and "D" indicating obvious abnormalities. The test results are shown in Table 2.

[0054] (2) Stability test 2 Except for leaving the product for one week after production, a test similar to Stability Test 1 was conducted. The test results are shown in Table 2.

[0055] (3) Curing test After preparing the dispersion, the L component, M component, and N component were uniformly mixed according to the formulation shown in Table 2 to prepare a curable composition. Each of the obtained curable compositions was applied to a slate board with a trowel so that the thickness after curing would be 4 mm. After curing for 24 hours at 50°C, the degree of adhesion of the coating was confirmed by touch. Evaluation was performed on a four-point scale (excellent: A>B>C>D: poor), with "A" indicating no adhesion and "D" indicating adhesion. The test results are shown in Table 2.

[0056] (4) Finishability test After the curing test, the surface of the resulting coating was visually inspected and evaluated. Evaluation was performed on a four-point scale (A>B>C>D: poor), with "A" indicating no abnormalities and "D" indicating blistering. The evaluation results are shown in Table 2.

[0057]

Table 1

[0058]

Table 2

Claims

1. A curable composition comprising a dispersion (L) containing a polyol compound (a), a surfactant (b), and water (c), an isocyanate compound (M), and cement (N), The curable composition is characterized in that the surfactant (b) comprises a surfactant (b1) having an HLB of less than 9 and a surfactant (b2) having an HLB of 9 or more, and the mixing ratio of the component (b1) to the component (b2) is 1:0.3 to 98:2 by weight.

2. The polyol compound (a) is one or more selected from castor oil polyols and polyether polyols, and has a hydroxyl value of 100 mg KOH / g or more and 500 mg KOH / g or less; The dispersion liquid (L) further contains a polyhydric alcohol, The curable composition according to claim 1, wherein the polyhydric alcohol is one or more selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, neopentyl glycol, trimethylolethane, trimethylolpropane, glycerin, pentaerythritol, 1,6-hexanediol, ester glycol, 1,4-cyclohexanedimethanol, and 1,3-butanediol.

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