Surface appearance improver for hydraulic composition

Abstract

To provide a surface appearance improver for a hydraulic composition which is excellent in storage stability during high-temperature storage.SOLUTION: A surface appearance-improving agent for a hydraulic composition, comprising a specific component (A), a specific component (B), a specific component (C) and water, wherein a mass ratio of a content of the component (A) to a content of the component (B) [(A) / (B)] is 0.1 or more and 1.5 or less, and a content of the component (C) is 5% by mass or more and 50% by mass or less.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a surface appearance improver for a hydraulic composition, a method for producing a cured product of the hydraulic composition, and a method for improving the surface appearance of the hydraulic composition. [Background technology]

[0002] Hydraulic compositions, such as concrete, can be hardened by, for example, filling a formwork with unhardened hydraulic compositions and hardening them by drying or chemical reaction to obtain a hardened body of the hydraulic composition. One of the factors that influences the value of the hardened body is the aesthetic appearance of the surface. One of the evaluations of the aesthetic appearance of the hardened body is the effect of reducing the traces of air bubbles exposed on the surface of the hardened body.

[0003] Patent Document 1 discloses that adding a cement additive containing two specific alcohols, in which alkylene oxides are added to alcohol in block form, to cement can produce mortar or concrete with a bubble-free surface and excellent surface appearance. Patent Document 2 discloses a resin emulsion used as a cement additive, which contains a specific emulsion resin, an aqueous solvent, and a nonionic emulsifier used in emulsion polymerization of the resin, and discloses that using a cement additive containing the resin emulsion can improve the surface appearance of a cured cement composition. Patent Document 3 discloses a surface appearance improver composition for hydraulic compositions, which contains one or more compounds selected from four specific alkylene oxide addition compounds having a hydrophobic group containing a carbon atom, a compound that becomes cloudy or separates at 20°C when added to water at 0.1% by mass, and a cement dispersant. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 1-131041 [Patent Document 2] JP 2019-26506 A [Patent Document 3] Japanese Patent Application Laid-Open No. 2017-114703 Summary of the Invention [Problem to be solved by the invention]

[0005] In construction work environments, particularly in the summer, additives for hydraulic compositions that have high storage stability during high-temperature storage are desirable. For example, if a container containing additives for hydraulic compositions is exposed to direct sunlight during the daytime during a hot summer, the temperature inside the container may reach, for example, 60°C. In such cases, it is desirable to store the container indoors out of direct sunlight. However, depending on the manufacturing site, there are many cases where sufficient storage space cannot be secured and the container must be stored outdoors. The present invention provides a surface aesthetic improver for hydraulic compositions that has excellent storage stability during high-temperature storage. [Means for solving the problem]

[0006] In one embodiment, the present invention provides a surface aesthetic improver for a hydraulic composition, comprising the following component (A), the following component (B), the following component (C), and water, wherein the mass ratio of the content of the component (A) to the content of the component (B), [(A) / (B)], is from 0.1 to 1.5, and the content of the component (C) in the aesthetic improver is from 5 to 50% by mass:

[0007] (A) A compound represented by the following general formula (a): R 1a -O-[(EO) na (PO) ma ]-H(a) [In the formula, R 1a is a hydrocarbon group having 8 to 18 carbon atoms, EO is an ethyleneoxy group, PO is a propyleneoxy group, na is the average number of moles of EO added and is a number of 1 to 10, ma is the average number of moles of PO added and is a number of 0 to 10, and EO and PO may be bonded in blocks or randomly. (B) A compound represented by the following general formula (b): R 1b -O-[(EO)nb (PO) mb ]-SO3M b (b) [In the formula, R 1b is a hydrocarbon group having 4 to 20 carbon atoms, EO is an ethyleneoxy group, PO is a propyleneoxy group, nb is the average number of moles of EO added and is a number of 1 to 50, and mb is the average number of moles of PO added and is a number of 0 to 10, and EO and PO may be bonded in blocks or randomly. b indicates a counter cation. (C) A copolymer containing, as constituent monomers, a monomer (1c) represented by the following general formula (1c) and a monomer (2c) represented by the following general formula (2c):

[0008] [ka]

[0009] [During the ceremony, R 1c , R 2c , R 3c may be the same or different, and may be a hydrogen atom, a methyl group, or (CH2) r COOM 2c and (CH2) r COOM 2c COOM 1c or other (CH2) r COOM 2c and an anhydride may be formed, in which case the M 1c , M 2c does not exist. M 1c , M 2c : may be the same or different, and may be a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, an alkylammonium group, a substituted alkylammonium group, an alkyl group, a hydroalkyl group or an alkenyl group; r: Indicates a number between 0 and 2.

[0010] [ka]

[0011] [During the ceremony, R 4c , R 5c : may be the same or different, hydrogen atom or methyl group R 6c : Hydrogen atom or -(CO) p2 O(AO) mc R 7c R 7c : a hydrogen atom or an alkyl group having 1 to 4 carbon atoms AO: an alkyleneoxy group having 2 to 4 carbon atoms nc, mc: the average number of moles of AO added, 4 or more and 300 or less q1: A number between 0 and 2 p1, p2: 0 or 1 indicates.]

[0012] In another embodiment, the present invention provides a method for producing a hardened hydraulic composition, the method comprising the steps of: mixing the surface aesthetics improver for hydraulic compositions, hydraulic powder, and water to prepare a hydraulic composition; filling a form with the prepared hydraulic composition and curing it; and demolding the hardened hydraulic composition.

[0013] In another embodiment, the present invention provides a method for improving the surface appearance of a hydraulic composition, which comprises adding the above-mentioned surface appearance improver for hydraulic compositions to a hydraulic composition containing hydraulic powder and water. [Effects of the Invention]

[0014] According to the present invention, it is possible to obtain a surface appearance improver for a hydraulic composition which has excellent storage stability when stored at high temperatures. DETAILED DESCRIPTION OF THE INVENTION

[0015] [Surface appearance improver for hydraulic compositions] The surface aesthetic improver for hydraulic compositions of the present invention (hereinafter referred to as the aesthetic improver of the present invention) contains the component (A), the component (B), the component (C), and water.

[0016] <Component (A)> The appearance improver of the present invention contains, as component (A), a compound represented by the following general formula (a) (hereinafter referred to as component (A) of the present invention).

[0017] R 1a -O-[(EO) na (PO) ma ]-H(a) [In the formula, R 1a is a hydrocarbon group having 8 to 18 carbon atoms, EO is an ethyleneoxy group, PO is a propyleneoxy group, na is the average number of moles of EO added and is a number of 1 to 10, ma is the average number of moles of PO added and is a number of 0 to 10, and EO and PO may be bonded in blocks or randomly.

[0018] R 1a R is, for example, a hydrocarbon group having 8 or more carbon atoms, preferably 9 or more, more preferably 10 or more, and 18 or less carbon atoms, preferably 16 or less, more preferably 14 or less, and even more preferably 12 or less, from the viewpoint of the surface appearance of the cured product of the hydraulic composition (reducing the amount of bubble traces). 1a is preferably a linear or branched alkyl group or a linear or branched alkenyl group, more preferably a linear or branched alkyl group, and even more preferably a linear alkyl group.

[0019] For example, na is 1 or more, and from the viewpoint of the surface appearance of the hydraulic composition hardened body (reduced bubble traces), preferably 2 or more, and 10 or less, preferably 8 or less, more preferably 6 or less.

[0020] ma is, for example, 0 or more, and from the viewpoint of the surface appearance of the hydraulic composition hardened body (reducing the number of bubble traces), preferably 1 or more, more preferably 2 or more, and 10 or less, preferably 5 or less, more preferably 3 or less.

[0021] From the viewpoint of the surface appearance of the hydraulic composition cured body (reduced bubble traces), the HLB of the (A) component is preferably 7 or more, more preferably 9 or more, even more preferably 10 or more, and preferably 14 or less, more preferably 13 or less.

[0022] Here, HLB is an abbreviation for Hydrophile Lipophile Balance, and is an index for determining whether a compound is hydrophilic or lipophilic. For general nonionic surfactants, the HLB value ranges from 0 to 20. The smaller the HLB value, the stronger the lipophilicity. HLB is calculated, for example, by the Griffin method.

[0023] The HLB value according to the Griffin method is calculated, for example, by the following formula. HLB = (sum of molecular weights of hydrophilic parts / molecular weight) × 20

[0024] <(B) component> The appearance improver of the present invention contains, as component (B), a compound represented by the following general formula (b) (hereinafter referred to as component (B) of the present invention).

[0025] R 1b -O-[(EO) nb (PO) mb ]-SO3M 1b (b) [In the formula, R 1b is a hydrocarbon group having 4 to 20 carbon atoms, EO is an ethyleneoxy group, PO is a propyleneoxy group, nb is the average number of moles of EO added and is a number of 1 to 50, and mb is the average number of moles of PO added and is a number of 0 to 10, and EO and PO may be bonded in blocks or randomly. 1b is the counter cation.

[0026] R 1b R is, for example, a hydrocarbon group having 4 or more carbon atoms, preferably 10 or more carbon atoms, more preferably 12 or more carbon atoms, from the viewpoints of compatibility between component (A) and component (C) described later, solubility in water, and storage stability during high-temperature storage, and R is, for example, a hydrocarbon group having 20 or less carbon atoms, preferably 18 or less carbon atoms, from the viewpoints of compatibility between component (A) and component (C) described later, solubility in water, and storage stability during high-temperature storage. 1bis preferably a linear or branched alkyl group or a linear or branched alkenyl group, more preferably a linear alkyl or alkenyl group.

[0027] nb is, for example, 1 or more, preferably 3 or more from the viewpoints of compatibility between the component (A) and the component (C) described later, solubility in water, and storage stability during high-temperature storage; and, for example, 50 or less, preferably 40 or less, more preferably 30 or less, from the viewpoints of compatibility between the component (A) and the component (C) described later, solubility in water, and storage stability during high-temperature storage.

[0028] mb is, for example, 0 or more, and from the viewpoints of compatibility between the (A) component and the (C) component described later, solubility in water, and storage stability during high-temperature storage, preferably 1 or more, more preferably 2 or more; and, for example, 10 or less, and from the viewpoints of compatibility between the (A) component and the (C) component described later, solubility in water, and storage stability during high-temperature storage, preferably 5 or less, more preferably 3 or less.

[0029] EO and PO may be bonded in block or random combination, and from the viewpoint of manufacturability, for example, block addition is preferred. From the viewpoints of compatibility between component (A) and component (C), which will be described later, and storage stability during high-temperature storage, for example, mb is preferably 0.

[0030] M 1b Examples of the cation include one or more inorganic ions selected from sodium ion, ammonium ion, potassium ion, calcium ion, and magnesium ion, and one or more organic ammonium ions selected from monoethanolammonium ion, diethanolammonium ion, triethanolammonium ion, and morpholinium ion, and from the viewpoint of availability, sodium ion is preferred.

[0031] <(C) component> The appearance improver of the present invention contains, as component (C), a copolymer containing, as constituent monomers, a monomer (1c) represented by the general formula (1c) above and a monomer (2c) represented by the general formula (2c) above (hereinafter referred to as component (C) of the present invention).

[0032] The monomer (1c) is represented by the general formula (1c). In the general formula (1c), R 1c is, for example, preferably a hydrogen atom. In general formula (1c), from the viewpoint of availability, R 2c is, for example, preferably a hydrogen atom or a methyl group. In general formula (1c), from the viewpoint of availability, R 3c is, for example, preferably a hydrogen atom.

[0033] In general formula (1c), (CH2) r COOM 2c About COOM 1c or other (CH2) r COOM 2c and an anhydride may be formed, in which case the M 1c , M 2c does not exist. M 1c and M 2c may be the same or different, and are, for example, preferably at least one selected from a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, an alkylammonium group, a substituted alkylammonium group, an alkyl group, a hydroalkyl group, and an alkenyl group. 1c and M 2c The alkyl group, the hydroalkyl group, and the alkenyl group each preferably have 1 to 4 carbon atoms, for example. 1c and M 2cmay be the same or different, and are, for example, preferably one or more selected from a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, or an alkylammonium group, more preferably one or more selected from a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), and an ammonium group, even more preferably a hydrogen atom, an alkali metal, or an alkaline earth metal (1 / 2 atom), and still more preferably a hydrogen atom or an alkali metal. r COOM 2c For example, r is preferably 0.

[0034] Examples of the compound of general formula (1c) include acrylic acid, methacrylic acid, fumaric acid, maleic acid, itaconic acid, and maleic anhydride.

[0035] The monomer (2c) is represented by the general formula (2c). 4c In view of availability, R is preferably a hydrogen atom, for example. 5c In terms of availability, R is, for example, preferably a hydrogen atom or a methyl group, more preferably a methyl group. 6c In view of availability, R is preferably a hydrogen atom, for example. 7c is, for example, preferably a hydrogen atom or a methyl group, more preferably a methyl group, from the viewpoint of availability. In general formula (2c), AO is, for example, preferably one or more alkyleneoxy groups selected from an ethyleneoxy group and a propyleneoxy group, more preferably an ethyleneoxy group, from the viewpoint of availability. AO may, for example, be an alkyleneoxy group preferably containing an ethyleneoxy group.

[0036] In general formula (2c), nc and mc are the average number of moles of AO added, and are, for example, 4 or more, and from the viewpoint of dispersibility of the hydraulic composition, preferably 10 or more, more preferably 20 or more, and for example, 300 or less, preferably 150 or less, more preferably 120 or less, and even more preferably 80 or less. In general formula (2c), from the viewpoint of availability, q1 is, for example, preferably 0, 1 or 2, more preferably 0 or 1, and even more preferably 0. In general formula (2c), from the viewpoint of copolymerizability with monomer (1c), p1 and p2 are, for example, preferably 1.

[0037] Examples of the compound of general formula (2c) include alkylene oxide adducts of 3-methyl-3-buten-1-ol, alkylene oxide adducts of isoprenyl alcohol, alkylene oxide adducts of vinyl alcohol, alkylene oxide adducts of 1,4-butanediol monovinyl ether, alkylene oxide adducts of allyl alcohol, and alkylene oxide adducts of methallyl alcohol.

[0038] As the component (C) of the present invention, the proportion of the monomer (1c) in the total amount of the monomer (1c) and the monomer (2c) in all the constituent monomers of the copolymer is, for example, from the viewpoint of dispersibility in the hydraulic composition, preferably 1 mass % or more, more preferably 5 mass % or more, and preferably 40 mass % or less, more preferably 30 mass % or less, and even more preferably 20 mass % or less.

[0039] As the component (C) of the present invention, the proportion of the monomer (1c) in all the constituent monomers of the copolymer is, from the viewpoint of dispersibility in the hydraulic composition, for example, preferably 1 mass % or more, more preferably 5 mass % or more, even more preferably 10 mass % or more, and preferably 40 mass % or less, more preferably 30 mass % or less, even more preferably 20 mass % or less.

[0040] As the component (C) of the present invention, the total amount of the monomer (1c) and the monomer (2c) among all the constituent monomers of the copolymer is, for example, preferably 70% by mass or more, more preferably 80% by mass or more, even more preferably 90% by mass or more, and preferably 100% by mass or less, from the viewpoint of dispersibility in the hydraulic composition. This total amount may be 100% by mass.

[0041] From the viewpoint of dispersibility in the hydraulic composition, the weight average molecular weight of the copolymer as component (C) of the present invention is, for example, preferably 5,000 or more, more preferably 10,000 or more, even more preferably 20,000 or more, and preferably 10,0000 or less, more preferably 80,000 or less, even more preferably 60,000 or less. The weight average molecular weight of component (C) of the present invention is a value converted into that of an unneutralized acid type compound.

[0042] The weight average molecular weight of the copolymer was measured by gel permeation chromatography (GPC) under the following conditions.

[0043] *GPC conditions Apparatus: GPC (HLC-8320GPC) manufactured by Tosoh Corporation Column: G4000PWXL + G2500PWXL (Tosoh Corporation) Eluent: 0.2M phosphate buffer / CH3CN=9 / 1 Flow rate: 1.0mL / min Column temperature: 40℃ Detection: RI Sample size: 0.2 mg / mL Standard substance: Polyethylene glycol equivalent (monodisperse polyethylene glycol with known molecular weight, molecular weight 87,500, 250,000, 145,000, 46,000, 24,000)

[0044] As the component (C) of the present invention, for example, the copolymer may contain, in addition to the monomer (1c) and the monomer (2c), one or more monomers (3c) copolymerizable with the monomer (1c) and / or the monomer (2c). Examples of the monomer (3c) include acrylic esters. As the component (C) of the present invention, the copolymer may contain, for example, 100 mass% of all structural units of the copolymer, in which the total of the monomers (1c) and (2c) or the total of the monomers (1c), (2c), and (3c) accounts for 100 mass%.

[0045] From the viewpoint of high-temperature stability and surface appearance of the cured product of the hydraulic composition (reduced bubble traces), the component (C) of the present invention may be, for example, two or more selected from copolymers containing the monomer (1c) and the monomer (2c) as constituent monomers.

[0046] The component (C) of the present invention may preferably be two or more copolymers selected from copolymers containing, as constituent monomers, one or more monomers selected from acrylic acid and methacrylic acid as the monomer (1c) and one or more monomers selected from an alkylene oxide adduct of 3-methyl-3-buten-1-ol, an alkylene oxide adduct of isoprenyl alcohol, and an alkylene oxide adduct of methallyl alcohol as the monomer (2c).

[0047] When the component (C) of the present invention is two or more types selected from copolymers containing the monomer (1c) and the monomer (2c) as constituent monomers, from the viewpoint of high-temperature stability and surface appearance of the cured product of the hydraulic composition (reduced bubble traces), the copolymer may be, for example, two or more types selected from a copolymer of acrylic acid as the monomer (1c) and an alkylene oxide adduct of isoprenyl alcohol as the monomer (2c) [e.g., (C1)], and a copolymer of methacrylic acid as the monomer (1c) and an alkylene oxide adduct of 3-methyl-3-buten-1-ol as the monomer (2c) [e.g., (C2)], and the mass ratio of the content of the (C1) to the content of the (C2), [(C1) / (C2)], may be, for example, 0.1 or more and 10 or less.

[0048] <(D) component> The appearance improver of the present invention may further contain, as component (D), for example, a solvent shown below (hereinafter referred to as component (D) of the present invention).

[0049] (D) One or more solvents selected from compounds represented by the following general formula (d1) (excluding component (A)) and compounds represented by the following general formula (d2):

[0050] R 1d -O-[(EO) nd (PO) md ]-H (d1) [In the formula, R 1d represents a hydrocarbon group having 4 to 15 carbon atoms, EO represents an ethyleneoxy group, PO represents a propyleneoxy group, nd represents a number of 1 to 5, and md represents a number of 0 to 5, and EO and PO may be bonded in blocks or randomly.

[0051] [ka]

[0052] [In the formula, R 2d is a hydrocarbon group having 6 to 12 carbon atoms, R 3d and R 4d are each independently a hydrocarbon group having 1 to 4 carbon atoms.

[0053] In general formula (d1), R 1d When R is a hydrocarbon group that does not contain an aromatic ring, 1d is, from the viewpoint of the viscosity of the appearance improver of the present invention, for example, an alkyl or alkenyl group having 4 or more carbon atoms and 15 or less, preferably 10 or less, more preferably 8 or less, and even more preferably 6 or less carbon atoms. 1d When R is a hydrocarbon group containing an aromatic ring, from the viewpoint of the viscosity of the aesthetic improver of the present invention, 1d has, for example, 6 or more carbon atoms and, for example, 15 or less carbon atoms, preferably 12 or less carbon atoms, more preferably 7 or less carbon atoms, and may also be 6 carbon atoms.

[0054] In general formula (d1), nd is, from the viewpoint of the viscosity of the appearance improver of the present invention, preferably a number, for example, 1 or more and, for example, 5 or less, preferably 4 or less, more preferably 3 or less, and even more preferably 2 or less, and is preferably an integer. nd may also be the average number of moles of EO added.

[0055] In general formula (d1), md is, from the viewpoint of the viscosity of the appearance improver of the present invention, a number that is, for example, 0 or more and, for example, 5 or less, preferably 4 or less, more preferably 3 or less, even more preferably 2 or less, and still more preferably 1 or less, preferably an integer, and may also be 0. Furthermore, md may be the average number of moles of PO added.

[0056] In general formula (d2), R 2d From the viewpoint of antifoaming properties, may be, for example, a hydrocarbon group having 6 or more and 12 or less, preferably 10 or less, more preferably 8 or less carbon atoms, preferably an alkyl or alkenyl group, more preferably an alkyl group.

[0057] In general formula (d2), R 3d and R 4d From the viewpoint of antifoaming properties, R are, for example, each independently a hydrocarbon group having 1 or more carbon atoms and 4 or less, preferably 3 or less, more preferably 2 or less carbon atoms, and are preferably an alkyl group or an alkenyl group. 3d and R 4d and are preferably both methyl groups.

[0058] Specific examples of the component (D) of the present invention include one or more solvents selected from phenoxyethanol (ethylene glycol monophenyl ether), phenyl diglycol, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, tetraethylene glycol monobutyl ether, and alkyldimethylamines having an alkyl group with 8 to 10 carbon atoms. From the viewpoint of viscosity, one or more solvents selected from phenoxyethanol, phenyl diglycol, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, tetraethylene glycol monobutyl ether, octyldimethylamine, and decyldimethylamine are preferred, one or more solvents selected from phenoxyethanol, phenyl diglycol, diethylene glycol monobutyl ether, octyldimethylamine, and decyldimethylamine are more preferred, and phenoxyethanol is even more preferred.

[0059] <Composition, etc.> The content of the component (A) of the present invention in the aesthetic enhancer of the present invention, calculated as an active ingredient, is, for example, preferably 0.1 mass % or more, more preferably 0.5 mass % or more, and even more preferably 0.9 mass % or more from the viewpoint of the surface aesthetics of the hydraulic composition cured body (reducing the amount of bubble traces), and from the viewpoint of economy, is preferably 20 mass % or less, more preferably 15 mass % or less, and even more preferably 10 mass % or less.

[0060] The content of the component (B) of the present invention in the aesthetic enhancer of the present invention, calculated as an active ingredient, is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and even more preferably 1% by mass or more, from the viewpoints of compatibility between the components (A) and (C), solubility in water, and storage stability during high-temperature storage, and from the viewpoint of economy, is preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less. b is expressed as a value converted into sodium ions.

[0061] The content of the component (C) of the present invention in the aesthetic improver of the present invention, calculated as an active ingredient, is, for example, 5% by mass or more, preferably 10% by mass or more, more preferably 15% by mass or more from the viewpoint of dispersibility of the hydraulic composition, and 50% by mass or less, preferably 40% by mass or less from the viewpoint of surface aesthetics of the cured product of the hydraulic composition (reduced bubble traces). The content of the component (C) of the present invention is the value calculated as an unneutralized acid compound.

[0062] When the aesthetic enhancer of the present invention contains component (D), the content of component (D) of the present invention in the aesthetic enhancer of the present invention is, from the viewpoint of viscosity, for example, preferably 0.2 mass% or more, more preferably 1 mass% or more, even more preferably 2 mass% or more, and preferably 10 mass% or less, more preferably 5 mass% or less.

[0063] In the aesthetic enhancer of the present invention, the mass ratio of the content of the component (A) of the present invention to the content of the component (B) of the present invention, [(A) / (B)], is, in terms of the active ingredient, for example, 0.1 or more. From the viewpoint of the surface aesthetics of the cured product of the hydraulic composition (reducing the amount of bubble traces), it is preferably 0.10 or more, more preferably 0.12 or more, even more preferably 0.15 or more, and still more preferably 0.2 or more. And, from the viewpoints of the compatibility of the components (A) and (C), solubility in water, and storage stability during high-temperature storage, it is preferably 1.5 or less, more preferably 1.45 or less, more preferably 1.4 or less, and still more preferably 1.35 or less.

[0064] In the aesthetic enhancer of the present invention, the total content of the component (A) of the present invention and the component (B) of the present invention, calculated as the active ingredient, is, for example, from the viewpoints of the surface aesthetics of the hydraulic composition cured body (reduced bubble traces) and storage stability during high-temperature storage, preferably 1.0 mass% or more, more preferably 1.5 mass% or more, even more preferably 2.0 mass% or more, and still more preferably 2.5 mass% or more, and from the viewpoint of viscosity, preferably 25 mass% or less, more preferably 20 mass% or less, even more preferably 15 mass% or less, and still more preferably 10 mass% or less.

[0065] In the aesthetic enhancer of the present invention, the mass ratio [(A) / (C)] of the content of the component (A) of the present invention to the content of the component (C) of the present invention, calculated as the active ingredient, is, for example, preferably 0.03 or more, more preferably 0.04 or more, from the viewpoint of the surface aesthetics of the cured product of the hydraulic composition (reduced bubble traces), and is preferably 1.0 or less, more preferably 0.5 or less, and even more preferably 0.35 or less, from the viewpoint of compatibility between the component (A) and the component (C).

[0066] In the aesthetic enhancer of the present invention, the mass ratio [{(A)+(B)} / (C)] of the total content of the component (A) of the present invention and the component (B) of the present invention to the content of the component (C) of the present invention, converted into the active ingredient, is, for example, preferably 0.05 or more, more preferably 0.08 or more, and even more preferably 0.10 or more from the viewpoint of the surface aesthetics of the cured product of the hydraulic composition (reduction of bubble traces), and is preferably 1.0 or less, more preferably 0.7 or less from the viewpoint of the fluidity of the hydraulic composition.

[0067] The aesthetic enhancer of the present invention contains water. That is, the aesthetic enhancer of the present invention may be an aqueous solution containing the components (A), (B), and (C) of the present invention and water, in which the mass ratio of the content of the component (A) to the content of the component (B), [(A) / (B)], is from 0.1 to 1.5, and the content of the component (C) is from 5 to 50% by mass of the total content of the components (A), (B), (C), and water.

[0068] In the aesthetic enhancer of the present invention, the water content is, for example, preferably 40% by mass or more, more preferably 50% by mass or more, and preferably less than 94% by mass, more preferably 75% by mass or less, from the viewpoint of viscosity.

[0069] In the aesthetic enhancer of the present invention, the mass ratio of the content of the component (B) of the present invention to the content of the component (D) of the present invention, [(D) / (B)], is, for example, preferably 0.050 or more, more preferably 0.10 or more, from the viewpoint of product stability, and is preferably 1.0 or less, more preferably 0.50 or less, from the viewpoint of cost reduction.

[0070] The aesthetic improver of the present invention may contain other components in addition to the components (A) to (D) described above, provided that the effects of the present invention are not adversely affected. Examples of such components include water-soluble polymer compounds, cement wetting agents, expansive additives, retarders, quick-setting additives, thickeners, flocculants, strength enhancers, hardening accelerators, and preservatives (excluding the components (A) to (D) described above).

[0071] Furthermore, the aesthetic appearance improver of the present invention also exhibits excellent surface aesthetic improvement in an embodiment in which the aesthetic appearance improver contains the (A) component, the (B) component, the (C) component, and optionally the (D) component, with a mass ratio [(A) / (B)] of 0.1 to 1.5 and the (C) component in the aesthetic appearance improver accounts for 5% by mass to 10% by mass. As a specific embodiment, the aesthetic appearance improver may further contain an antifoaming agent. The antifoaming agent contained in the aesthetic appearance improver of the present invention is not particularly limited as long as it does not affect the effects of the present invention. For example, an antifoaming agent (excluding the (A) component) with an HLB value of less than 3 may be used. The HLB value of the antifoaming agent is calculated using the Griffin method described above.

[0072] Specific examples include polyalkylene glycol alkyl ether-based antifoaming agents, polyalkylene glycol alkyl ester-based antifoaming agents, polyol polyether-based antifoaming agents, polyalkylene glycol block polymer-based antifoaming agents, silicone-based antifoaming agents, and among these, antifoaming agents having an HLB of less than 3. From the viewpoint of adjusting the amount of air in the hydraulic composition and the storage stability of the surface aesthetics improver, for example, preferably one or more selected from polyalkylene glycol alkyl ether-based antifoaming agents, polyalkylene glycol alkyl ester-based antifoaming agents, and silicone-based antifoaming agents, more preferably a silicone-based antifoaming agent.

[0073] The aesthetic enhancer of the present invention may contain the antifoaming agent in an amount, for example, preferably 0.005% by mass or more, more preferably 0.01% by mass or more, from the viewpoint of suppressing excessive air entrainment in the hydraulic composition, and in an amount, for example, preferably 1.0% by mass or less, more preferably 0.5% by mass or less, from the viewpoint of compatibility of the antifoaming agent in the aesthetic enhancer.

[0074] The aesthetics improver of the present invention is prepared by blending the components (A), (B), (C), and water. That is, the present invention may be a method for producing a surface aesthetics improver for a hydraulic composition, which comprises blending the components (A), (B), (C), and water, so that the mass ratio of the amount of the component (A) to the amount of the component (B) in the total amount of the blended raw materials, [(A) / (B)], is in the range of 0.1 to 1.5, and the component (C) is blended in an amount of 5 to 50 mass% in the total amount of the blended raw materials.

[0075] Furthermore, the aesthetics improver of the present invention may be prepared by blending component (A) of the present invention, component (B) of the present invention, component (C) of the present invention, and water in multiple batches. That is, the present invention may be a method for producing a surface aesthetics improver for a hydraulic composition, which blends component (A) of the present invention, component (B) of the present invention, component (C) of the present invention, and water, such that the mass ratio [(A) / (B)] of the amount of component (A) of the present invention to the amount of component (B) of the present invention in the total amount of the blended raw materials is in the range of 0.1 to 1.5, and component (C) of the present invention is blended in an amount of 5 to 50 mass% of the total amount of the blended raw materials, and which comprises blending component (A), component (B), and water, and further blending component (C).

[0076] The aesthetics improver of the present invention may be prepared by blending at least one or more of the component (A) of the present invention, the component (B) of the present invention, and the component (C) of the present invention in multiple batches. That is, the present invention may be a method for producing a surface aesthetics improver for a hydraulic composition, which comprises blending the component (A) of the present invention, the component (B) of the present invention, the component (C) of the present invention, and water, such that the mass ratio [(A) / (B)] of the amount of the component (A) of the present invention to the amount of the component (B) of the present invention in the total amount of the blended raw materials is in the range of 0.1 to 1.5, and the component (C) of the present invention is blended in an amount of 5 to 50 mass% of the total amount of the blended raw materials, and which comprises blending at least one or more of the component (A), the component (B), and the component (C) in multiple batches. The method for producing the surface aesthetic improver for hydraulic compositions of the present invention may be, for example, a method for producing the surface aesthetic improver for hydraulic compositions in which the component (C) of the present invention is mixed multiple times, more specifically, twice.

[0077] <Hydraulic composition> The hydraulic composition of the present invention may contain the component (A) of the present invention, the component (B) of the present invention, the component (C) of the present invention, water, and, if necessary, the component (D) of the present invention and a hydraulic powder, wherein the mass ratio of the content of the component (A) to the content of the component (B), [(A) / (B)], is from 0.1 to 1.5, and the content of the component (C) in the hydraulic composition may be from 5 to 50 mass%. The hydraulic composition of the present invention may also contain the aesthetic enhancer of the present invention, hydraulic powder, and water. The matters described for the surface aesthetic enhancer for hydraulic compositions of the present invention may be applied to the hydraulic composition of the present invention as appropriate. The components (A), (B), (C), and, if necessary, the component (D) used in the hydraulic composition of the present invention are the same as those described for the surface aesthetic enhancer for hydraulic compositions of the present invention.

[0078] The hydraulic powder used in the hydraulic composition of the present invention is a powder that hardens when mixed alone with water. Examples of hydraulic powders include ordinary Portland cement, high-early-strength Portland cement, ultra-high-early-strength Portland cement, sulfate-resistant Portland cement, low-heat Portland cement, white Portland cement, and ecocement (e.g., JIS R5214). Among these, from the viewpoint of shortening the time required for the hydraulic composition to reach the required strength, preferred is a cement selected from early-early-strength Portland cement, ordinary Portland cement, sulfate-resistant Portland cement, and white Portland cement, more preferably a cement selected from early-early-strength Portland cement and ordinary Portland cement.

[0079] The hydraulic composition of the present invention may contain a non-hydraulic powder. In the present invention, the term "non-hydraulic powder" refers to a powder that does not harden or hardly hardens when mixed with water alone. However, non-hydraulic powders also include latent hydraulic powders that harden when mixed with water under specific conditions, such as an alkaline or acidic atmosphere or a high-pressure steam atmosphere. For example, slag does not harden by itself, but when combined with an alkaline substance such as lime or cement and water, it forms a hydrate through the interaction with water and hardens (latent hydraulicity), making it a latent hydraulic powder. Examples of non-hydraulic powders include one or more selected from calcium hydroxide, gypsum, calcium carbonate, silica stone, clay, blast furnace slag, fly ash, and silica fume. Preferably, the non-hydraulic powder is a latent hydraulic powder.

[0080] The hydraulic composition of the present invention contains the component (A) in an amount relative to the hydraulic powder in the hydraulic composition, for example, preferably 0.001% by mass or more, more preferably 0.005% by mass or more, even more preferably 0.010% by mass or more, and even more preferably 0.030% by mass or more from the viewpoint of surface appearance of the hardened product of the hydraulic composition (reduction of bubble traces), and preferably 10.0% by mass or less, more preferably 3.0% by mass or less, even more preferably 2.5% by mass or less, even more preferably 2.0% by mass or less, and even more preferably 1.0% by mass or less from the viewpoint of economy.

[0081] The hydraulic composition of the present invention contains the component (B) in an amount relative to the hydraulic powder in the hydraulic composition, for example, preferably 0.001% by mass or more, more preferably 0.005% by mass or more, even more preferably 0.010% by mass or more, and even more preferably 0.030% by mass or more, from the viewpoint of storage stability of the aesthetic enhancer during high-temperature storage, and preferably 10% by mass or less, more preferably 3% by mass or less, even more preferably 2.5% by mass or less, even more preferably 2.0% by mass or less, and even more preferably 1.0% by mass or less, from the viewpoint of economy.

[0082] The hydraulic composition of the present invention contains the component (C) in an amount relative to the hydraulic powder in the hydraulic composition, for example, preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.10% by mass or more from the viewpoint of fluidity of the hydraulic composition, and preferably 2.0% by mass or less, more preferably 1.0% by mass or less, and even more preferably 0.50% by mass or more from the viewpoint of economy. When the hydraulic composition of the present invention contains the component (D), the component (D) is contained in an amount of, for example, preferably 0.001% by mass or more, more preferably 0.010% by mass or more, and even more preferably 0.030% by mass or more relative to the hydraulic powder in the hydraulic composition from the viewpoint of storage stability of the aesthetic enhancer during high-temperature storage, and from the viewpoint of economy, preferably 1.0% by mass or less, more preferably 3% by mass or less, and even more preferably 1.0% by mass or less.

[0083] The hydraulic composition of the present invention has a water / hydraulic powder ratio (mass percentage (mass %) of water to hydraulic powder in the slurry) of, for example, preferably 20 mass % or more, more preferably 30 mass % or more, even more preferably 40 mass % or more, and preferably 70 mass % or less, more preferably 60 mass % or less, even more preferably 57 mass % or less.

[0084] From the viewpoints of workability and economy, the hydraulic composition of the present invention has a water / hydraulic powder ratio [water and hydraulic powder in the hydraulic composition (mass of water / mass of hydraulic powder × 100)] of, for example, preferably 20% or more, more preferably 30% or more, and preferably 95% or less, more preferably 80% or less.

[0085] The amount of air contained in the hydraulic composition of the present invention is not particularly limited, but from the viewpoint of durability of the set body of the hydraulic composition, it is, for example, preferably 0% or more, more preferably 3.0% or less.

[0086] The hydraulic composition of the present invention may further contain aggregate. Examples of aggregate include fine aggregate and coarse aggregate. Examples of fine aggregate include mountain sand, land sand, river sand, and crushed sand. Examples of coarse aggregate include mountain gravel, land gravel, river gravel, and crushed stone. Depending on the application, lightweight aggregate may be used. The term aggregate is based on "Concrete General Guide" (published by Gijutsu Shoin, June 10, 1998).

[0087] The aggregate may be used in the usual range used in preparing concrete, mortar, etc. When the hydraulic composition is concrete, the amount of coarse aggregate used is preferably 50% or more by bulk volume, more preferably 55% or more, even more preferably 60% or more, and preferably 100% or less, more preferably 90% or less, even more preferably 80% or less, from the viewpoint of the properties of the concrete. The bulk volume is the amount of coarse aggregate used per 1 m of concrete. 3 In addition, when the hydraulic composition is concrete, the amount of fine aggregate used is preferably 500 kg / m from the viewpoint of improving filling properties into forms, etc. 3More preferably, 600 kg / m 3 More preferably, 700 kg / m 3 or more, and preferably 1000 kg / m 3 Less than or equal to 900 kg / m 3 When the hydraulic composition is mortar, the amount of fine aggregate used is preferably 800 kg / m 3 More preferably, 900 kg / m 3 More preferably, 1000 kg / m 3 or more, and preferably 2000 kg / m 3 or less, more preferably 1800 kg / m 3 or less, more preferably 1700 kg / m 3 The following is the result.

[0088] The hydraulic composition of the present invention may further contain other components in addition to the above components, such as retarders, thickeners, waterproofing agents, fluidizing agents, and early strengthening agents. Examples of early-strengthening agents include compounds selected from alkali metal and alkaline earth metal hydrochlorides, sulfates, nitrates, nitrites, cyanates, thiocyanates, thiosulfates, and formates, or organic compounds selected from alkanolamines, glycerin derivatives, formaldehyde derivatives, and catechol derivatives, and nanoparticles of Portland cement hydration products (CSH, calcium carbonate and calcium hydroxide).

[0089] The hydraulic composition of the present invention may be used for concrete or mortar. The hydraulic composition of the present invention is useful in any field such as self-leveling, refractories, plaster, lightweight or heavy-duty concrete, air entrainment, repair, prepacked, trame, ground improvement, grout, and cold weather use.

[0090] <Method for producing hydraulic composition> The present invention provides a method for producing a hydraulic composition by blending component (A) of the present invention, component (B) of the present invention, component (C) of the present invention, and water, and, if necessary, component (D) of the present invention and hydraulic powder, with water, in which the components are blended so that the mass ratio of the blended amount of component (A) to the blended amount of component (B), [(A) / (B)], is in the range of 0.1 to 1.5, and component (C) is blended in an amount of 5 to 50 mass% of the total amount of the blended raw materials other than the hydraulic powder (hereinafter also referred to as the method for producing the hydraulic composition of the present invention). The present invention also provides a method for producing a hydraulic composition by blending a surface aesthetic improver for hydraulic compositions, which contains the component (A) of the present invention, the component (B) of the present invention, the component (C) of the present invention, water, and, if necessary, the component (D) of the present invention, with hydraulic powder and water, wherein the mass ratio [(A) / (B)] of the content of the component (A) to the content of the component (B) in the surface aesthetic improver for hydraulic compositions is from 0.1 to 1.5, and the content of the component (C) in the surface aesthetic improver for hydraulic compositions is from 5 to 50 mass% (hereinafter also referred to as the method for producing the hydraulic composition of the present invention).

[0091] In the method for producing a hydraulic composition of the present invention, specific examples and preferred aspects of the components (A), (B), (C), (D) and optional components of the present invention may be the same as those of the surface aesthetic improver for a hydraulic composition of the present invention. Also, in the method for producing a hydraulic composition of the present invention, specific examples and preferred aspects of the hydraulic powder may be the same as those of the hydraulic composition of the present invention. Furthermore, the matters described for the surface aesthetic improver for a hydraulic composition and the hydraulic composition of the present invention may be appropriately applied to the method for producing a hydraulic composition of the present invention.

[0092] In the method for producing the hydraulic composition of the present invention, for example, the components (A), (B), and (C) of the present invention and the optional components described above may be mixed separately with hydraulic powder to prepare the hydraulic composition, or if the components (A), (B), (C) and the optional components of the present invention are mixed in advance, there is no need to install a new tank, and the combined mixture may be mixed with hydraulic powder. That is, in the method for producing the hydraulic composition of the present invention, the aesthetic enhancer of the present invention may be mixed with hydraulic powder.

[0093] The mixing amounts (blending amounts) of each component, hydraulic powder, and water used in the method for producing the hydraulic composition of the present invention may be the same as those of each component, hydraulic powder, and water described in the hydraulic composition of the present invention, but may be replaced with the mixing amounts (blending amounts).

[0094] Specifically, in the method for producing the hydraulic composition of the present invention, the blending amount of the aesthetic enhancer of the present invention, as parts by mass of solid content, relative to 100 parts by mass of hydraulic powder is preferably 0.001 parts by mass or more, more preferably 0.01 parts by mass or more, and even more preferably 0.03 parts by mass or more, from the viewpoint of the aesthetic surface appearance of the hardened product of the hydraulic composition (reduction of the number of bubble traces), and is preferably 3.0 parts by mass or less, more preferably 2.5 parts by mass or less, even more preferably 2.0 parts by mass or less, and even more preferably 1.0 part by mass or less, from the viewpoint of the aesthetic surface appearance of the hardened product of the hydraulic composition (reduction of the number of bubble traces) and economic efficiency.

[0095] In the method for producing the hydraulic composition of the present invention, mixing may be carried out using a mixer such as a mortar mixer, a forced twin-screw mixer, etc. The mixing time is, for example, preferably 1 minute or more, more preferably 2 minutes or more, and preferably 5 minutes or less, more preferably 3 minutes or less.

[0096] <Method for producing a hardened product of hydraulic composition> The present invention provides a method for producing a hardened product of a hydraulic composition (hereinafter referred to as "a method for producing a hardened product of the hydraulic composition of the present invention"), which comprises the steps of preparing a hydraulic composition by blending the above-mentioned surface aesthetic improver for hydraulic compositions of the present invention, hydraulic powder, and water, filling a form with the prepared hydraulic composition and curing it, and demolding the hardened hydraulic composition. The present invention also provides a method for producing a hardened hydraulic composition, comprising the steps of: preparing a hydraulic composition by blending component (A) of the present invention, component (B) of the present invention, component (C) of the present invention, and water, and, if necessary, component (D) of the present invention and hydraulic powder with water; filling a form with the prepared hydraulic composition and curing it; and demolding the cured hydraulic composition, wherein in the step of preparing the hydraulic composition, the components are blended so that the mass ratio [(A) / (B)] of the amount of component (A) to the amount of component (B) in the total amount of the blended raw materials other than the hydraulic powder is in the range of 0.1 to 1.5, and the component (C) is blended in an amount of 5 to 50 mass% in the total amount of the blended raw materials other than the hydraulic powder (hereinafter referred to as the "method for producing a hardened hydraulic composition of the present invention"). The present invention also provides a method for producing a cured product of a hydraulic composition, comprising the steps of: preparing a hydraulic composition by blending a surface aesthetic improver for hydraulic compositions, which contains the component (A) of the present invention, the component (B) of the present invention, the component (C) of the present invention, water, and, if necessary, the component (D) of the present invention, with a hydraulic powder; filling a form with the prepared hydraulic composition and curing it; and demolding the cured hydraulic composition, wherein the mass ratio [(A) / (B)] of the content of the component (A) to the content of the component (B) in the surface aesthetic improver for hydraulic compositions is from 0.1 to 1.5, and the content of the component (C) in the surface aesthetic improver for hydraulic compositions is from 5 to 50 mass% (hereinafter referred to as the "method for producing a cured product of the hydraulic composition of the present invention").

[0097] In the method for producing a cured product of the hydraulic composition of the present invention, specific examples and preferred aspects of the components (A), (B), (C), and, if necessary, the component (D), and optional components of the present invention may be the same as those of the surface aesthetic improver for hydraulic compositions of the present invention. Furthermore, in the method for producing a cured product of the hydraulic composition of the present invention, specific examples and preferred aspects of the hydraulic powder may be the same as those of the hydraulic composition of the present invention. Furthermore, the matters described for the surface aesthetic improver for hydraulic compositions of the present invention, the hydraulic composition of the present invention, and the method for producing the hydraulic composition of the present invention may be appropriately applied to the method for producing a cured product of the hydraulic composition of the present invention.

[0098] The step of preparing the hydraulic composition included in the method for producing a hardened product of the hydraulic composition of the present invention may be the same as the method for producing the hydraulic composition of the present invention.

[0099] The method for producing a hardened product of the hydraulic composition of the present invention includes, for example, a step of filling a formwork with the hydraulic composition prepared in the previous step and hardening the composition. Examples of forms used in the method for producing a hardened product of the hydraulic composition of the present invention include formwork for buildings and formwork for concrete products. Methods for filling the formwork include a method of directly pouring the composition from a mixer and a method of introducing the hydraulic composition into the formwork by pressure-feeding it with a pump.

[0100] The form used in the method for producing a hardened hydraulic composition of the present invention may preferably be coated with a release agent, for example, from the viewpoint of the releasability of the hardened hydraulic composition when demolded. The release agent may be (1) mineral oil such as kerosene, light oil, spin oil, transformer oil, or machine oil, (2) synthetic oil such as polyalkylene glycol, (3) vegetable oil such as rapeseed, coconut, palm, or soybean oil, (4) fats and oils, or (5) fatty acid esters, and may be either an "oil-based release agent" that is applied as is or an "aqueous-based release agent" that is emulsified in water.

[0101] In the method for producing a hardened product of the hydraulic composition of the present invention, for example, when the hydraulic composition of the present invention is filled into a form and cured, heat curing can be carried out to accelerate hardening. Here, heat curing can be carried out by maintaining the hydraulic composition at a temperature of 40°C or higher and 80°C or lower to accelerate hardening, for example.

[0102] The hardened hydraulic composition can be demolded to obtain a hardened product of the hydraulic composition of the present invention. At the time of demolding, it is preferable that the hardened product of the hydraulic composition has sufficient compressive strength. The compressive strength at the time of demolding is preferably equal to or greater than the strength specified in, for example, "2023 Japan Society of Civil Engineers Standard Specifications [Construction Section] Commentary Table 8.8.1."

[0103] Examples of hardened products of hydraulic compositions using formwork for concrete products include civil engineering products such as concrete piles, concrete poles, various block products for revetments, box culvert products, segment products used in tunnel construction and the like, and girder products for bridge piers, and examples of architectural products include curtain wall products and architectural component products used for columns, beams, and floorboards.

[0104] In the present invention, in the preparation of the hydraulic composition, the time from bringing the hydraulic powder into contact with water to demolding is, for example, preferably 16 hours or more and 72 hours or less, from the viewpoint of obtaining the strength required for demolding and improving the production cycle.

[0105] <Method for improving the surface appearance of a hardened product of a hydraulic composition> The present invention provides a method for adding the surface aesthetic improver for hydraulic compositions of the present invention to a hydraulic composition containing hydraulic powder and water (hereinafter also referred to as the "aesthetic improvement method of the present invention"). The present invention also provides a method for improving the surface appearance of a hardened body of a hydraulic composition, which comprises adding the components (A), (B), and (C) of the present invention, water, and, if necessary, the component (D) when preparing the hydraulic composition by mixing hydraulic powder with water, wherein the mass ratio of the amount of the component (A) to the amount of the component (B) added, [(A) / (B)], is in the range of 0.1 to 1.5, based on the total amount of the added raw materials other than the hydraulic powder, and the component (C) is added in an amount of 5 to 50 mass% based on the total amount of the added raw materials other than the hydraulic powder (hereinafter also referred to as the "method for improving the surface appearance of the present invention"). The present invention also provides a method for adding a surface aesthetics improver for hydraulic compositions containing the components (A), (B), and (C), water, and optionally the component (D) of the present invention when preparing a hydraulic composition by mixing hydraulic powder with water, wherein the mass ratio [(A) / (B)] of the content of the component (A) to the content of the component (B) in the surface aesthetics improver for hydraulic compositions is 0.1 or more and 1.5 or less, and the content of the component (C) in the surface aesthetics improver for hydraulic compositions is 5% by mass or more and 50% by mass or less (hereinafter also referred to as the "appearance improving method of the present invention").

[0106] Specific examples and preferred embodiments of the components (A), (B), (C), water, and optionally the component (D) and optional components of the present invention used in the aesthetic improvement method of the present invention may be the same as those described for the surface aesthetic improver for hydraulic compositions of the present invention. Specific examples and preferred embodiments of the hydraulic powder used in the aesthetic improvement method of the present invention may be the same as those described for the hydraulic composition of the present invention. Furthermore, the matters described for the surface aesthetic improver for hydraulic compositions of the present invention, the hydraulic composition of the present invention, the method for producing the hydraulic composition of the present invention, and the method for producing a cured product thereof may be appropriately applied to the aesthetic improvement method of the present invention. [Example]

[0107] In addition to component (C) shown in Table 1, the following components were used for components (A), (B), and comparative components shown in Table 2. In components (A) and (B), the number in parentheses after polyoxyethylene indicates the average number of moles of oxyethylene groups added. In the table, the "content (mass%)" value for each component indicates the amount of active ingredient. Furthermore, the mass ratio and the "total content (mass%) of components (A) and (B)" in the table indicate the amount calculated from the amount of active ingredient of each component.

[0108] [Ingredients used] <Component (A)> Polyoxyethylene (5) lauryl ether (Kao Corporation) HLB: 10.5 Polyoxyethylene (6) lauryl ether (Kao Corporation) HLB: 12.1 <(B) component> Polyoxyethylene (18) lauryl ether sulfate sodium (Kao Corporation) Polyoxyethylene (23) oleyl ether sulfate sodium (Kao Corporation) <(C) component> Copolymers (C-1), (C-2), (C-3), and (C-4) shown in Table 1

[0109] The components used in the hydraulic compositions shown in Table 2 were as follows. Cement: Ordinary Portland cement (a 50 / 50 mix of Taiheiyo Cement and Sumitomo Osaka Cement, specific gravity 3.16) Water: Tap water (Wakayama City tap water, specific gravity 1.00) Fine aggregate: Mountain sand (produced in Joyo, Kyoto City, surface dry specific gravity 2.50)

[0110] Example 1 and Comparative Example 1 (Table 2) (1) Preparation of a surface aesthetic improver for hydraulic compositions The surface appearance improver for hydraulic compositions of the present invention was prepared by putting the components (A), (B), and (C) shown in Table 2 (the remainder being water; a total of 100 mass%) into a glass beaker and mixing with water for 5 minutes using a magnetic stirrer.

[0111] (2) Evaluation of high-temperature stability 50 g of the surface appearance improver for hydraulic compositions shown in Table 2 was placed in a screw tube (Maruem, No. 7, 35 mm x 78 mm), thoroughly shaken and stirred, and then irradiated with ultrasonic waves. After irradiation, the screw tube was left to stand at 60°C for 1 hour. Thereafter, the appearance was visually observed and evaluated according to the following criteria. The results of Example 1 are shown in Table 2.

[0112] ○: Transparent and not separated into two layers. △: The mixture is not separated into two layers, but is cloudy. ×: Separated into two layers.

[0113] (3) Evaluation of the surface appearance of the hardened hydraulic composition (3-1) Preparation of hydraulic composition In a laboratory controlled at 20°C ± 2°C, 400 g of the aforementioned cement and 700 g of fine aggregate were added to a mortar mixer (Dalton Corporation, universal mixer, model: 5DM-03-γ) so that the sand-cement ratio (sand / cement) was 1.75, and dry mixing was performed for 10 seconds at a low speed (63 rpm). Subsequently, mixing water prepared to the following composition was added to the mixer, and the amount of water was adjusted to a water-cement ratio of 30%. The mortar mixer was then fully mixed for 120 seconds at a low speed (63 rpm) to prepare the hydraulic composition (mortar) of the present invention. The surface aesthetic improver for hydraulic compositions (Table 2) was added to the mixing water in an amount such that 0.2 parts by mass of component (C) was added per 100 parts by mass of cement. In order to defoam the air entrained in the mortar, 0.05 parts by mass of a defoaming agent (Antifoam E20, manufactured by Kao Corporation) was added to the mixing water relative to 100 parts by mass of water.

[0114] (3-2) Calculation method of air bubble occupancy rate assuming air bubble traces on the surface of hardened hydraulic composition 1000 mL of the obtained hydraulic composition was placed in a 1000 mL acrylic resin measuring cylinder, and the surface (side of the measuring cylinder) was photographed with a smartphone. Image data was converted to two colors using ImageJ (areas with air bubbles were black, and other areas were white). From the ratio of each color, the area ratio of air bubbles occupying the planar image of the hydraulic composition was calculated using the following formula, and this was defined as the air bubble occupancy (area %). The obtained air bubble occupancy was evaluated according to the following criteria and defined as "Evaluation of the surface aesthetics of the hardened hydraulic composition body." The results of Example 1 are shown in Table 2.

[0115] Air bubble occupancy rate (area%) = [pixels corresponding to the area of ​​air bubbles / pixels corresponding to the area of ​​the planar image of the hydraulic composition] x 100 Good: Bubble occupancy rate is 0.00% or more and less than 0.50% by area △: Bubble occupancy rate is 0.50% or more and less than 1.00% by area ×: Bubble occupancy rate is 1.00% or more by area

[0116] [Table 1]

[0117] [Table 2]

[0118] Example 2 and Comparative Example 2 (Table 3) 50 g of polyoxyethylene (5) lauryl ether (component A), 5 g of polyoxyethylene (23) oleyl sulfate sodium (component B), and 40 g of tap water were placed in a screw tube (Maruem, No. 7, 35 mm x 78 mm) and thoroughly shaken and stirred, followed by ultrasonic irradiation to prepare an aqueous surfactant solution. Subsequently, surface aesthetic improvers for hydraulic compositions were prepared using the aqueous surfactant solution and copolymers (C-1), (C-2), and (C-4) shown in Table 1, so that the contents of each component were as shown in Table 3. The obtained surface aesthetic improvers for hydraulic compositions were evaluated in the same manner as in Example 1. The hydraulic compositions for surface aesthetic evaluation were prepared in the same manner as in Example 1. The results of Example 2 are shown in Table 3.

[0119] [Table 3]

Claims

1. A surface aesthetic improver for a hydraulic composition, comprising the following component (A), the following component (B), the following component (C), and water, wherein the mass ratio of the content of the component (A) to the content of the component (B), [(A) / (B)], is 0.1 or more and 1.5 or less, and the content of the component (C) in the aesthetic improver is 5% by mass or more and 50% by mass or less. (A) A compound represented by the following general formula (a): 2 1a --[(5O) na ・(P) ma )((a) [In the formula, R 1a represents a hydrocarbon group having 8 to 18 carbon atoms, EO represents an ethyleneoxy group, PO represents a propyleneoxy group, na represents the average number of moles of EO added and is a number of 1 to 10, ma represents the average number of moles of PO added and is a number of 0 to 10, and EO and PO may be bonded in blocks or randomly. (B) A compound represented by the following general formula (b): ( 1b _____________________ nb ・(); mb ___ 3 * ｂ () [In the formula, R 1b is a hydrocarbon group having 4 to 20 carbon atoms, EO is an ethyleneoxy group, PO is a propyleneoxy group, nb is the average number of moles of EO added and is a number of 1 to 50, mb is the average number of moles of PO added and is a number of 0 to 10, and EO and PO may be bonded in blocks or randomly. ｂ indicates a counter cation. (C) A copolymer containing, as constituent monomers, a monomer (1c) represented by the following general formula (1c) and a monomer (2c) represented by the following general formula (2c): 【Chemistry 1】 [During the ceremony, R 1c , R 2c , R 3c may be the same or different, and may be a hydrogen atom, a methyl group, or (CH 2 ) r COOM 2c and (CH 2 ) r COOM 2c is COOM 1c or other (CH 2 ) r COOM 2c and an anhydride may be formed, in which case the M 1c , M 2c does not exist. M 1c , M 2ｃ may be the same or different, and are a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), an ammonium group, an alkylammonium group, a substituted alkylammonium group, an alkyl group, a hydroalkyl group, or an alkenyl group r: a number between 0 and 2, indicates.] 【Chemistry 2】 [During the ceremony, R 4c , R 5c : may be the same or different, and may be a hydrogen atom or a methyl group R 6c : a hydrogen atom or -(CO) p2 O (AO) mc R 7c R 7c : a hydrogen atom or an alkyl group having 1 to 4 carbon atoms AO: an alkyleneoxy group having 2 to 4 carbon atoms nc, mc: average number of moles of AO added, 4 or more and 300 or less q1: a number between 0 and 2 p1, p2: 0 or 1 indicates.]

2. 2. The surface appearance improver for hydraulic compositions according to claim 1, wherein the HLB of component (A) is 7 or more and 14 or less.

3. 3. The surface appearance improver for a hydraulic composition according to claim 1, wherein the total content of the component (A) and the component (B) in the appearance improver is 1.0 mass% or more and 25 mass% or less.

4. 3. The surface appearance improver for a hydraulic composition according to claim 1, wherein the mass ratio of the content of the component (A) to the content of the component (C), [(A) / (C)], is 0.03 or more and 1.0 or less.

5. 3. The surface appearance improver for a hydraulic composition according to claim 1 or 2, wherein the mass ratio of the total content of the component (A) and the component (B) to the content of the component (C), [{(A) + (B)} / (C)], is 0.05 or more and 1.0 or less.

6. A step of preparing a hydraulic composition by blending the surface appearance improver for hydraulic compositions according to claim 1 or 2, hydraulic powder, and water; a step of filling the prepared hydraulic composition into a form and hardening it; and A step of demolding the hardened hydraulic composition; A method for producing a hardened product of a hydraulic composition comprising the above-mentioned formula (1).

7. A method for improving the surface appearance of a hydraulic composition, comprising adding the surface appearance improver for hydraulic compositions according to claim 1 or 2 to a hydraulic composition containing hydraulic powder and water.

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