Foaming agent for hydraulic components

Abstract

To provide a foaming agent for hydraulic compositions that can ensure a sufficient amount of bubbles are incorporated and produce a hardened body of a bubble-containing hydraulic composition with good surface aesthetics. [Solution] A foaming agent for hydraulic compositions, comprising the following component (A1) and a monohydric alcohol having a hydrocarbon group with 12 carbon atoms (hereinafter referred to as component (B)), wherein the mass ratio of the content of component (B) to the content of component (A1) [(B) / (A1)] is 0.005 or more and 0.045 or less. (A1) Components: One or more selected from alkyl or alkenyl sulfate esters having an alkyl or alkenyl group with 12 carbon atoms and their salts.

Description

Technical Field

[0001] The present invention relates to a foaming agent for hydraulic compositions and a hydraulic composition containing bubbles.

Background Art

[0002] In the hardened body of a bubble-containing hydraulic composition using cement or gypsum as a curing agent, further weight reduction is required from the viewpoints of environmental (CO2) reduction effects and costs due to manufacturing, transportation, and raw material procurement. In order to increase the amount of air in the hydraulic composition, it is known to incorporate a surfactant to introduce bubbles into the hydraulic composition.

[0003] Patent Document 1 discloses a foaming agent composition for construction work containing (A) an alkyl ether sulfate having a hydrocarbon group with 12 to 24 carbon atoms, (B) an alcohol having 12 or more carbon atoms, and (C) one or more components selected from an anionic surfactant having a hydrocarbon group with 11 or fewer carbon atoms, a fatty acid having 11 or fewer carbon atoms or its salt, an alcohol having 11 or fewer carbon atoms, and a water-soluble nonionic surfactant. In the total anionic surfactant in the composition, the proportion of (A) is 70% by mass or more, and the mass ratio (C) / (A), which is the mass ratio of the content of component (C) to the content of component (A), is 0.1 or more and 5 or less. A technique for introducing appropriate bubbles to improve the fluidity of aerated soil using the foaming agent composition is disclosed. Patent Document 2 discloses a foaming agent composition for a hydraulic composition containing (A1): one or more selected from an alkyl or alkenyl sulfate having an alkyl group or alkenyl group with 8 to 10 carbon atoms and its salt, (A2): one or more selected from surfactants other than component (A1), and (B): a monohydric alcohol having 6 to 10 carbon atoms, and the mass ratio (A1) / [(A1)+(A2)] of the content of component (A1) to the total content of components (A1) and (A2) is 0.8 or more and 1 or less. A technique for increasing the average bubble diameter in the composition even in a hydraulic composition having the same specific gravity and containing bubbles is disclosed. Patent Document 3 discloses a foaming agent for aerated concrete, which contains (A) an alkyl sulfate ester salt or alkyl ether sulfate ester salt having an alkyl group having 8 to 20 carbon atoms, (B) one or more selected from amphoteric surfactants and amine oxide type surfactants, (C) an aliphatic alcohol having 8 to 20 carbon atoms, and (D) a glycol ether solvent, wherein the A / B ratio, which represents the mass ratio of the content of component (A) to the content of component (B), is 1 to 6, and the fluidity of an aerated concrete slurry containing this foaming agent at low temperatures is measured. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2021-32053 [Patent Document 2] Japanese Patent Publication No. 2023-70662 [Patent Document 3] Japanese Patent Publication No. 2023-89734 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] In order to add further value to bubble-containing hydraulic compositions, in addition to weight reduction, there is a need for technologies that can provide, for example, an appearance with fewer visible voids on the surface of the hardened bubble-containing hydraulic composition. The present invention provides a foaming agent for hydraulic compositions that can ensure a sufficient amount of bubbles to reduce the specific gravity of the hardened hydraulic composition, and that can produce a bubble-containing hydraulic composition in which the diameter of the bubbles mixed into the hydraulic composition is fine, resulting in an appearance with fewer visible voids on the surface of the hardened hydraulic composition (hereinafter also referred to as "surface aesthetics"). [Means for solving the problem]

[0006] The present invention relates to a foaming agent for hydraulic compositions, in one embodiment, which contains the following component (A1) and (B) a monohydric alcohol having a hydrocarbon group with 12 carbon atoms [hereinafter referred to as component (B)], wherein the mass ratio of the content of component (B) to the content of component (A1) [(B) / (A1)] is 0.005 or more and 0.045 or less. (A1) Components: One or more selected from alkyl or alkenyl sulfate esters having an alkyl or alkenyl group with 12 carbon atoms and their salts.

[0007] In another embodiment, the present invention relates to a bubble-containing hydraulic composition containing a hydraulic powder, water, component (A1), and component (B), wherein the mass ratio of the content of component (B) to the content of component (A1) [(B) / (A1)] is 0.005 or more and 0.045 or less. [Effects of the Invention]

[0008] The foaming agent for hydraulic compositions of the present invention ensures a sufficient amount of bubbles to reduce the specific gravity of the hardened body of the hydraulic composition, and also makes it possible to obtain a hardened body of a bubble-containing hydraulic composition with good surface aesthetics. [Modes for carrying out the invention]

[0009] The reason why the foaming agent for hydraulic compositions and the foam-containing hydraulic compositions of the present invention can ensure a sufficient amount of foam and produce a hardened foam-containing hydraulic composition with a clean appearance and few visible voids is not entirely clear, but is presumed to be as follows: Component (A1) of the present invention forms micelles or mixed micelles, and due to the elution of high electrolytes from the hydraulic composition, it is presumed that using a foaming agent for hydraulic compositions containing component (A1) and component (B) of the present invention in a specific ratio makes it possible to achieve both hydrophobicity, water solubility, and cohesiveness between surfactants in the micelles or mixed micelles in the presence of high electrolytes. Furthermore, it is presumed that the water solubility of the foaming agent for hydraulic compositions of the present invention allows for control of a high diffusion adsorption rate to the gas-liquid interface, high adsorption amount to the gas-liquid interface due to high hydrophobicity, and a high foam coalescence prevention effect due to high cohesiveness, thereby improving foaming and reducing weight. However, the present invention is not limited to the above mechanism of action.

[0010] [Foaming agent for hydraulic composition] <(A1) component> In one embodiment, the foaming agent for hydraulic compositions of the present invention may contain, as component (A1), one or more alkyl or alkenyl sulfate esters having a C12 alkyl or alkenyl group and their salts.

[0011] Component (A1) may preferably be an alkyl sulfate ester having a C12 alkyl group and its salts, from the viewpoint of reducing the weight of the hydraulic composition. (A1) The salt of component (A1) may be one or more selected from alkali metal salts such as sodium salts and potassium salts, ammonium salts, and organic ammonium salts.

[0012] <(A2) component> The foaming agent for hydraulic compositions of the present invention may optionally contain one or more surfactants other than component (A1) as component (A2). Component (A2) may be one or more selected from anionic surfactants, nonionic surfactants, cationic surfactants, and amphoteric surfactants other than component (A1), and from the viewpoint of reducing the weight of the hydraulic composition, it may preferably be an anionic surfactant other than component (A1).

[0013] Examples of anionic surfactants other than component (A1) include alkyl or alkenyl sulfonic acids having an alkyl or alkenyl group, alkyl or alkenyl sulfate esters having an alkyl or alkenyl group (excluding component (A1)), olefin sulfonic acid, polyoxyalkylene alkyl or alkenyl ether sulfate esters having an alkyl or alkenyl group, polyoxyalkylene alkyl or alkenyl ether carboxylic acids having an alkyl or alkenyl group, and one or more selected from salts thereof. Examples of salts of these anionic surfactants include one or more selected from alkali metal salts such as sodium salts and potassium salts, ammonium salts, and organic ammonium salts.

[0014] Nonionic surfactants include one or more selected from alkyl monoglyceryl ethers, polyoxyalkylene monoalkyl or alkenyl ethers, alkyl glycosides or alkyl polyglycosides (glycoside-type nonionic surfactants), sorbitan-based nonionic surfactants, aliphatic alkanolamides, fatty acid monoglycerides, and sucrose fatty acid esters.

[0015] Cationic surfactants include one or more selected from alkyltrimethylammonium salts, dialkyldimethylammonium salts, alkylammonium salts, benzalkonium salts, benzethonium salts, imidazolium salts, and pyridinium salts. Halogen salts are examples of salts.

[0016] Examples of the amphoteric surfactant include one or more selected from alkyldimethylamine oxide, alkyldimethylaminoacetic acid betaine, alkylhydroxysulfobetaine, alkylamidopropyl betaine, and alkylcarboxymethylhydroxyethylimidazolium betaine.

[0017] (A2) component, among anionic surfactants other than the (A1) component, is preferably an alkyl or alkenyl sulfate ester and its salt other than the (A1) component, and from the viewpoint of weight reduction of the hydraulic composition, more preferably contains one or more selected from (A21) alkyl or alkenyl sulfate esters having an alkyl or alkenyl group with 8 to 10 carbon atoms and its salt [hereinafter, (A21) component].

[0018] Specific examples of the (A21) component include one or more selected from octyl sulfate ester and its salt, and decyl sulfate ester and its salt. Examples of these salts include one or more selected from alkali metal salts such as sodium salt and potassium salt, ammonium salt, and organic ammonium salt.

[0019] When the (A2) component contains the (A21) component, the content of the (A21) component in the (A2) component is preferably 20% by mass or more, more preferably 40% by mass or more, still more preferably 70% by mass or more, and preferably 100% by mass or less, more preferably 98% by mass or less, and may be 100% by mass. In the present invention, the mass of the (A21) component shall be the value converted to the sodium salt.

[0020] When containing the (A21) component as the (A2) component, from the viewpoint of weight reduction of the hydraulic composition and improvement of the surface appearance of the hardened body of the hydraulic composition [hereinafter simply referred to as improvement of appearance], preferably, as components other than the (A21) component, (A22) one or more selected from alkyl or alkenyl sulfate esters having an alkyl or alkenyl group with 12 to 18 carbon atoms and salts thereof [excluding the (A1) component], fatty acids having an alkyl or alkenyl group with 12 to 18 carbon atoms or salts thereof, and polyoxyalkylene alkyl or alkenyl ether sulfate esters having an alkyl or alkenyl group with 12 to 18 carbon atoms and salts thereof [hereinafter the (A22) component] may be contained.

[0021] (A22) As the component, alkyl or alkenyl sulfate esters having an alkyl or alkenyl group with 12 to 18 carbon atoms and salts thereof [excluding the (A1) component] specifically include one or more selected from tridecyl sulfate ester, tetradecyl sulfate ester, hexadecyl sulfate ester, octadecyl sulfate ester, oleyl sulfate ester, and salts thereof. From the viewpoints of weight reduction and improvement of appearance of the hydraulic composition, it may preferably be one or more selected from tetradecyl sulfate ester, hexadecyl sulfate ester, and salts thereof. Examples of these salts include one or more selected from alkali metal salts such as sodium salt and potassium salt, ammonium salt, and organic ammonium salt.

[0022] (A22) As the component, fatty acids having an alkyl or alkenyl group with 12 to 18 carbon atoms or salts thereof specifically include one or more selected from lauric acid, myristic acid, palmitic acid, stearic acid, palmitoleic acid, oleic acid, linoleic acid, linolenic acid, and salts thereof. Examples of these salts include one or more selected from alkali metal salts such as sodium salt and potassium salt, ammonium salt, and organic ammonium salt.

[0023] As component (A22), polyoxyalkylene alkyl or alkenyl ether sulfate esters and their salts having an alkyl or alkenyl group having 12 to 18 carbon atoms are preferably alkyl or alkenyl groups having 12 or more carbon atoms, preferably 18 or fewer, and more preferably 16 or fewer carbon atoms. The oxyalkylene group of component (A22) may be an oxyethylene group or an oxypropylene group, preferably an oxyethylene group. The average number of moles of oxyalkylene groups added is preferably 1 or more, more preferably 2 or more, from the viewpoint of reducing the weight and improving the appearance of the hydraulic composition, and preferably 30 or less, more preferably 10 or less. The salt of component (A22) may be one or more selected from alkali metal salts such as sodium salts and potassium salts, ammonium salts, and organic ammonium salts.

[0024] (A22) Specifically, the components include polyoxyethylene octyl ether sulfate, polyoxyethylene decyl ether sulfate, polyoxyethylene lauryl ether sulfate, polyoxyethylene tridecyl ether sulfate, polyoxyethylene myristyl ether sulfate, polyoxyethylene cetyl ether sulfate, polyoxyethylene stearyl ether sulfate, polyoxypropylene octyl ether sulfate, polyoxypropylene decyl ether sulfate, polyoxypropylene lauryl ether sulfate, polyoxypropylene tridecyl ether sulfate, polyoxypropylene myristyl ether sulfate, polyoxypropylene cetyl ether sulfate, polyoxypropylene stearyl ether sulfate, polyoxyethylene polyoxypropylene octyl ether sulfate, polyoxyethylene polyoxypropylene decyl ether sulfate, and polyoxyethylene polyoxypropylene lauryl ether sulfate. Examples include esters, polyoxyethylene polyoxypropylene tridecyl ether sulfate, polyoxyethylene polyoxypropylene myristyl ether sulfate, polyoxyethylene polyoxypropylene cetyl ether sulfate, polyoxyethylene polyoxypropylene stearyl ether sulfate, and one or more selected from these salts. From the viewpoint of foaming (bubbling ability), it is preferably polyoxyethylene decyl ether sulfate, polyoxyethylene lauryl ether sulfate, polyoxyethylene myristyl ether sulfate, polyoxypropylene decyl ether sulfate, polyoxyethylene polyoxypropylene lauryl ether sulfate, polyoxyethylene polyoxypropylene myristyl ether sulfate, and one or more selected from these salts.

[0025] When component (A2) contains component (A22), the content of component (A22) may be preferably 1% by mass or more, more preferably 2% by mass or more, and preferably 25% by mass or less, of component (A2). Alternatively, the content of component (A22) may be 100% by mass of component (A2), i.e., component (A2) may be component (A22). In the present invention, the mass of component (A22) shall be the value converted to the sodium salt.

[0026] When component (A2) contains components (A21) and (A22), the mass ratio of the content of (A21) to the total content of components (A21) and (A22) [(A21) / [(A21)+(A22)]] may be preferably 0.90 or more, more preferably 0.95 or more, and preferably 1.0 or less, and more preferably 0.99 or less, from the viewpoint of reducing the weight of the hydraulic composition and improving its appearance.

[0027] <(B) component> In one embodiment, the foaming agent for hydraulic compositions of the present invention may contain a monohydric alcohol having a hydrocarbon group with 12 carbon atoms as component (B). Component (B) is preferably 1-dodecyl alcohol.

[0028] <Composition, etc.> The foaming agent for hydraulic compositions of the present invention may contain component (A1) in an amount of preferably 8% by mass or more, more preferably 12% by mass or more, preferably 40% by mass or less, and more preferably 30% by mass or less, from the viewpoint of reducing the weight of the hydraulic composition and improving its appearance. In the present invention, the mass of component (A1) shall be the value converted to the sodium salt.

[0029] The foaming agent for hydraulic compositions of the present invention may optionally contain component (A2). From the viewpoint of reducing the weight of the hydraulic composition and improving its appearance, component (A2) may be present in the foaming agent in an amount of preferably 6% by mass or more, more preferably 8% by mass or more, even more preferably 12% by mass or more, and preferably 30% by mass or less, and more preferably 20% by mass or less. In the present invention, the mass of component (A2) shall be the value converted to the sodium salt.

[0030] The foaming agent for hydraulic compositions of the present invention optionally contains component (A2). The mass ratio of the content of component (A1) to the content of component (A2) [(A1) / (A2)] is preferably 0.3 or more, more preferably 0.6 or more, from the viewpoint of reducing the weight and improving the appearance of the hydraulic composition, and preferably 4 or less, more preferably 3 or less. In the present invention, the masses of component (A1) and component (A2) are calculated based on their sodium salt equivalents.

[0031] The foaming agent for hydraulic compositions of the present invention optionally contains component (A2). From the viewpoint of reducing the weight and improving the appearance of the hydraulic composition, the content of component (A1) in the total content of components (A1) and (A2) is preferably 30% by mass or more, more preferably 40% by mass or more, and from the viewpoint of reducing the weight and improving the appearance of the hydraulic composition, preferably 100% by mass or less, more preferably 90% by mass or less, even more preferably 80% by mass or less, and may be 100% by mass. In the present invention, the masses of components (A1) and (A2) shall be the values ​​converted to sodium salts.

[0032] The foaming agent for hydraulic compositions of the present invention may contain component (B) in an amount of preferably 0.05% by mass or more, more preferably 0.2% by mass or more, preferably 1.5% by mass or less, and more preferably 0.9% by mass or less, from the viewpoint of reducing the weight of the hydraulic composition and improving its appearance.

[0033] In the foaming agent for hydraulic compositions of the present invention, the mass ratio of the total content of component (A1) and component (A2) to the content of component (B) [[(A1)+(A2)] / (B)] is preferably 40 or more, more preferably 60 or more, from the viewpoint of reducing the weight and improving the appearance of the hydraulic composition, and preferably 1000 or less, more preferably 350 or less. In the present invention, the masses of component (A1) and component (A2) shall be the values ​​converted to sodium salts.

[0034] In the foaming agent for hydraulic compositions of the present invention, the mass ratio of the content of component (B) to the content of component (A1) [(B) / (A1)] is 0.005 or more, preferably 0.01 or more, more preferably 0.015 or more, and may be 0.045 or less, preferably 0.035 or less, more preferably 0.02 or less, from the viewpoint of reducing the weight of the hydraulic composition and improving its appearance. In the present invention, the mass of component (A1) shall be the value converted to the sodium salt.

[0035] <(C) component> From the viewpoint of reducing the weight of the hydraulic composition and improving its appearance, the foaming agent for hydraulic compositions of the present invention may contain, as component (C), a monovalent nonionic alcohol (excluding component (B)) with a LogP of 0 to 7.0. From the viewpoint of reducing the weight of the hydraulic composition, component (C) may preferably be a monovalent nonionic alcohol with a LogP of 1 or more, preferably 5 or less, more preferably 4 or less, and even more preferably 3.5 or less.

[0036] In this invention, the LogP value is a coefficient that indicates the affinity of an organic compound for water and 1-octanol. The 1-octanol / water partition coefficient P is the ratio of the equilibrium concentrations of the compound in each solvent at the partition equilibrium when a trace amount of the compound is dissolved as a solute in a two-phase solvent of 1-octanol and water, and is generally expressed in the form of its logarithm LogP with respect to base 10. LogP values ​​for many compounds have been reported, and many values ​​are listed in databases available from Daylight Chemical Information Systems, Inc. (Daylight CIS), etc., so they can be referred to. If there is no measured LogP value, it can be calculated using a program such as "CLogP" available from Daylight CIS. If a measured LogP value is available, this program will output the "calculated LogP (CLogP)" value calculated by Hansch, Leo's fragment approach along with the measured LogP value. The fragment approach is based on the chemical structure of the compound, taking into account the number of atoms and the type of chemical bonds (cf. A. Leo, Comprehensive Medicinal Chemistry, Vol.4, C. Hansch, PGSammens, JBTaylor and CA Ramsden, Eds., p.295, Pergamon Press, 1990). This CLogP value can be used in place of the measured LogP value when selecting a compound. In this invention, if a measured LogP value is available, that is used; otherwise, the CLogP value calculated by the program CLOGP v4.01 is used. The LogP value of polymers is calculated by determining the chemical structure from the degree of polymerization calculated from the average molecular weight.

[0037] (C) The components include monohydric nonionic alcohols with a LogP of 0 to 7.0, such as 1-propyl alcohol (LogP: 0.25), 2-propyl alcohol (LogP: 0.05), 1-butyl alcohol (LogP: 0.88), 2-butyl alcohol (LogP: 0.61), 2-methyl-1-propyl alcohol (LogP: 0.76), 2-methyl-2-propyl alcohol (LogP: 0.35), 1-pentyl alcohol (LogP: 1.51), 2-pentyl alcohol (LogP: 1.19), and 3-pentyl alcohol. (LogP: 1.21), 2-methyl-1-butyl alcohol (LogP: 1.29), 2-methyl-2-butyl alcohol (LogP: 0.89), 3-methyl-2-butyl alcohol (LogP: 1.28), 3-methyl-1-butyl alcohol (LogP: 1.16), cyclopentyl alcohol (LogP: 0.71), benzyl alcohol (LogP: 1.1), 2-hexyl alcohol (LogP: 1.76), 3-hexyl alcohol (LogP: 1.65), 2-methyl-1-pentyl alcohol (LogP: 1.75), 3-methyl 1-Pentyl alcohol (LogP: 1.75), 4-Methyl-1-Pentyl alcohol (LogP: 1.75), 2-Methyl-2-Pentyl alcohol (LogP: 1.57), 3-Methyl-2-Pentyl alcohol (LogP: 1.57), 4-Methyl-2-Pentyl alcohol (LogP: 1.57), 2-Methyl-3-Pentyl alcohol (LogP: 1.57), 3-Methyl-3-Pentyl alcohol (LogP: 1.57), 2,2-Dimethyl-1-Butyl alcohol (LogP: 1.57), 2-Ethyl-1-Butyl alcohol ( One or more alcohols selected from the following (LogP: 1.75), cyclohexyl alcohol (LogP: 1.23), 1-heptyl alcohol (LogP: 2.62), 1-hexyl alcohol (LogP: 2.03), 2-ethyl-1-hexyl alcohol (LogP: 2.73), 6-methyl-1-heptyl alcohol (LogP: 2.73), 1-octyl alcohol (LogP: 3), 1-decyl alcohol (LogP: 4.23), 1-tetradecyl alcohol (LogP: 5.5), and 1-hexadecyl alcohol (LogP: 6.7).

[0038] Component (C) may be one or more selected from 1-octyl alcohol (LogP: 3), 1-decyl alcohol (LogP: 4.23), 1-tetradecyl alcohol (LogP: 5.5), and benzyl alcohol (LogP: 1.1), preferably 1-octyl alcohol (LogP: 3), 1-decyl alcohol (LogP: 4.23), and benzyl alcohol (LogP: 1.1), from the viewpoint of reducing the weight of the hydraulic composition and improving its appearance.

[0039] If the foaming agent for hydraulic compositions of the present invention contains component (C), component (C) may be contained in the foaming agent in an amount of preferably 0.1% by mass or more, more preferably 1% by mass or more, preferably 10% by mass or less, and more preferably 5% by mass or less, from the viewpoint of reducing the weight of the hydraulic composition and improving its appearance.

[0040] The foaming agent for hydraulic compositions of the present invention may contain water. The foaming agent for hydraulic compositions of the present invention may contain water in an amount of preferably 40% by mass or more, preferably 50% by mass or more, more preferably 60% by mass or more, and preferably 90% by mass or less, more preferably 80% by mass or less, and even more preferably 75% by mass or less.

[0041] The foaming agent for hydraulic compositions of the present invention may optionally contain water-reducing agents, thickeners, chelating agents, heavy metal scavenging agents, rust inhibitors, preservatives, colorants, fragrances, defoaming agents, solvents, dispersants, flocculants, water-soluble polymers, etc. However, those used are those that do not fall under components (A1), (A2), (B), and (C).

[0042] The dispersant contained in the foaming agent for hydraulic compositions of the present invention may, for example, preferably be one or more compounds selected from naphthalene polymers, polycarboxylic acid polymers, ligninsulfonic acid polymers, melamine polymers, polymers containing phosphate groups in their structure, and polymers containing aromatics having polyalkylene oxy groups, more preferably one or more compounds selected from naphthalene polymers, polycarboxylic acid polymers, ligninsulfonic acid polymers, polymers containing phosphate groups in their structure, and polymers containing aromatics having polyalkylene oxy groups.

[0043] The foaming agent for hydraulic compositions of the present invention is obtained by mixing component (A1), component (A2), component (B), and the aforementioned optional components. During mixing, the solution may be heated as appropriate to reduce its viscosity.

[0044] Applications for the foaming agent for hydraulic compositions of the present invention include hydraulic compositions containing bubbles, such as freeze-resistant concrete, gypsum slurry, lightweight milk (bubble milk, air milk), lightweight mortar (bubble mortar, air mortar), lightweight concrete (bubble concrete, air concrete), backfill material, inter-fill material, concrete blocks for construction, ALC (autoclaved lightweight concrete), grout material, porous ceramics, bricks, refractories, lightweight embankments, pump-feed mortar, sprayed concrete, and sprayed mortar. In these bubble-containing hydraulic compositions, the mixing of bubbles is expected to impart functions such as weight reduction, strength improvement, fluidity improvement, heat insulation, heat resistance, viscosity imparting, and fluidity control. Among these bubble-containing hydraulic compositions, the foaming agent for hydraulic compositions of the present invention is suitable for freeze-resistant concrete, gypsum slurry, and lightweight concrete.

[0045] The foaming agent for hydraulic compositions of the present invention may be used as a mixed solution obtained by diluting it with water, and the mixed solution may be foamed and kneaded into the hydraulic substance, or the mixed solution may be kneaded into the hydraulic substance as is. The method of adding the foaming agent for hydraulic compositions of the present invention to the hydraulic composition is not limited, nor is the method of foaming the foaming agent for hydraulic compositions of the present invention or a mixed solution obtained by diluting it with water limited. In the present invention, the hydraulic substance refers to a paste, slurry, mortar, or concrete prepared as a hydraulic powder from one or more selected from cement, gypsum, and mixtures thereof.

[0046] [Water-hardening composition containing air bubbles, and method for producing the same] In one embodiment, the present invention provides a bubble-containing hydraulic composition containing a hydraulic powder, water, component (A1), and component (B), wherein the mass ratio of the content of component (B) to the content of component (A1) [(B) / (A1)] is 0.005 or more and 0.045 or less. The bubble-containing hydraulic composition of the present invention may further contain component (C). The bubble-containing hydraulic composition of the present invention may appropriately apply the matters described in the foaming agent for hydraulic compositions of the present invention. Component (A1), component (B), and component (C) used in the bubble-containing hydraulic composition of the present invention may be the same as those described in the foaming agent for hydraulic compositions of the present invention.

[0047] A hydraulic powder is a powder that has the property of hardening through a hydration reaction, and is preferably one or more selected from cement, gypsum, and mixtures thereof.

[0048] Examples of cements include ordinary Portland cement, rapid-hardening Portland cement, ultra-rapid-hardening Portland cement, sulfate-resistant Portland cement, low-heat Portland cement, moderate-heat Portland cement, white Portland cement, alumina cement, and eco-cement (e.g., JIS R 5214). Blast furnace slag cement, fly ash cement, silica fume cement, metakaolin cement, LC3 cement, etc., which are made by adding blast furnace slag, fly ash, silica fume, stone powder (calcium carbonate powder), metakaolin, calcined clay, etc., to these cements are also acceptable.

[0049] Any type of gypsum can be used, including high-quality neutralized gypsum, phosphate gypsum (a by-product of phosphoric acid), flue gas desulfurization gypsum generated from thermal power plants, natural gypsum containing various impurities and clay, and mixtures thereof. The clay contained in gypsum may mainly consist of hydrated silicate minerals with a layered structure (hereinafter referred to as clay minerals), and examples of clay minerals contained as fine-grained minerals in this clay include kaolin minerals (kaolinite, dickite, and nacrite), serpentine (lizardite, antigorite, chrysotile), mica clay minerals (illite, sericite, erythrolite, celadonite), chlorite, vermiculite, and smectite (montmorillonite, beidelite, nontronite, saponite, hectorite).

[0050] Examples of gypsum include anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum, and preferably hemihydrate gypsum (calcined gypsum). As raw material gypsum, natural gypsum, neutralized gypsum, or chemical gypsum such as by-product gypsum can be used alone or as a mixture of two or more of these. Examples of major chemical gypsums include phosphate gypsum, hydrofluoric acid gypsum, titanium gypsum, or flue gas desulfurization gypsum. Furthermore, recycled gypsum may be included in the raw material gypsum. Recycled gypsum can be any recycled gypsum recovered from waste gypsum boards generated in-house by gypsum board manufacturers, or from waste gypsum boards generated during new construction and demolition. The present invention can be suitably used with any of these raw material gypsums, and excellent effects can also be obtained with blends in various proportions.

[0051] The hydraulic powder may preferably contain cement and other hydraulic powders. For example, ordinary Portland cement may preferably be included in the hydraulic powder at a concentration of 25% by mass or more, more preferably 35% by mass or more, even more preferably 50% by mass or more, even more preferably 60% by mass or more, even more preferably 70% by mass or more, and preferably 95% by mass or less, more preferably 92% by mass or less, even more preferably 90% by mass or less, and even more preferably 85% by mass or less.

[0052] The bubble-containing hydraulic composition of the present invention may have a water / hydraulic powder ratio of preferably 20% by mass or more, more preferably 30% by mass or more, even more preferably 40% by mass or more, even more preferably 50% by mass or more, even more preferably 60% by mass or more, and even more preferably 65% ​​by mass or more, from the viewpoint of slurry fluidity, and preferably 100% by mass or less, more preferably 90% by mass or less, even more preferably 80% by mass or less, and even more preferably 75% by mass or less, from the viewpoint of hardened product strength. Here, the water / hydraulic powder ratio is the mass percentage (mass%) of water and hydraulic powder in the hydraulic composition, and is calculated as [water / hydraulic powder × 100]. The water / hydraulic powder ratio is calculated based on the amount of powder that has properties that harden through a hydration reaction. If the powder that hardens through a hydration reaction contains a high-strength admixture, the amount of the high-strength admixture is also included in the amount of hydraulic powder. The same may apply to other quantitative relationships of the hydraulic composition with respect to the hydraulic powder.

[0053] The bubble-containing hydraulic composition of the present invention may contain, in total, component (A1) and optionally component (A2) in an amount of 0.0005 parts by mass or more, more preferably 0.0006 parts by mass or more, and preferably 0.2 parts by mass or less, and more preferably 0.1 parts by mass or less, per 100 parts by mass of hydraulic powder, from the viewpoint of reducing the weight of the hydraulic composition, improving its appearance, and the strength of the hardened hydraulic composition.

[0054] The bubble-containing hydraulic composition of the present invention may contain component (A1) in an amount of preferably 0.0005 parts by mass or more, more preferably 0.0006 parts by mass or more, preferably 0.2 parts by mass or less, and more preferably 0.1 parts by mass or less, per 100 parts by mass of hydraulic powder, from the viewpoint of reducing the weight of the hydraulic composition, improving its appearance, and the strength of the hardened hydraulic composition.

[0055] The bubble-containing hydraulic composition of the present invention may contain component (B) in an amount of preferably 0.0000005 parts by mass or more, more preferably 0.000001 parts by mass or more, preferably 0.0004 parts by mass or less, and more preferably 0.0002 parts by mass or less, per 100 parts by mass of hydraulic powder, from the viewpoint of reducing the weight of the hydraulic composition, improving its appearance, and the strength of the hardened hydraulic composition.

[0056] In the bubble-containing hydraulic composition of the present invention, the mass ratio of the content of component (B) to the content of component (A1) [(B) / (A1)] may be 0.005 or more, preferably 0.01 or more, more preferably 0.015 or more, and 0.045 or less, preferably 0.04 or less, more preferably 0.035 or less, and even more preferably 0.02 or less, from the viewpoint of reducing the weight of the hydraulic composition, improving its appearance, and the strength of the hardened hydraulic composition.

[0057] If the bubble-containing hydraulic composition of the present invention contains component (C), component (C) may be contained in an amount of preferably 0.000002 parts by mass or more, more preferably 0.000003 parts by mass or more, preferably 0.03 parts by mass or less, and more preferably 0.015 parts by mass or less, per 100 parts by mass of hydraulic powder, from the viewpoint of reducing the weight of the hydraulic composition and improving its appearance.

[0058] The bubble-containing hydraulic composition of the present invention may contain fine aggregate and / or coarse aggregate. Furthermore, the bubble-containing hydraulic composition of the present invention may contain admixtures and admixtures known in the industry.

[0059] The method for producing the bubble-containing hydraulic composition of the present invention is, for example, (I) A method for producing the foam-containing hydraulic composition of the present invention, comprising: (I) a composition in which component (A1), optionally component (A2), component (B), and optionally component (C) are blended in such a way that the mass ratio of the content of component (B) to the content of component (A1) [(B) / (A1)] is in the range of 0.005 to 0.045, foaming the composition and blending the foam into a hydraulic substance; (II) A method for producing the bubble-containing hydraulic composition of the present invention involves preparing a hydraulic composition by blending component (A1), optionally component (A2), component (B), and optionally component (C) with a hydraulic substance in such a mass ratio of component (B) content to component (A1) content [(B) / (A1)] that is in the range of 0.005 to 0.045, and then foaming the hydraulic composition. Alternatively, a method may be used in which a foaming agent (liquid) is blended into the mixture before foaming, and then foamed.

[0060] The bubble-containing hydraulic composition of the present invention yields a hardened body when dried and cured. The specific gravity of the cured body of the bubble-containing hydraulic composition of the present invention is preferably 0.3 or higher, more preferably 0.4 or higher, and even more preferably 0.5 or higher from the viewpoint of the strength of the hardened body of the hydraulic composition, and may be preferably 2.5 or lower, more preferably 2.0 or lower, and even more preferably 1.5 or lower from the viewpoint of ease of handling.

[0061] The bubble-containing hydraulic composition of the present invention may contain bubbles. The average bubble diameter of the cured body of the bubble-containing hydraulic composition of the present invention is preferably 100 μm or more, more preferably 150 μm or more, from the viewpoint of strength of the hardened hydraulic composition, and preferably 400 μm or less, more preferably 300 μm or less, from the viewpoint of improving the aesthetic appearance of the hardened hydraulic composition.

[0062] The average bubble diameter is calculated by preparing a hardened body of the bubble-containing hydraulic composition, cutting a section of the hardened body to create a cross-section, observing the cross-section with a digital microscope, and measuring the diameter of, for example, 100 bubble cross-sections. The average value (arithmetic mean) of these measurements is then used to calculate the average bubble diameter. When measuring the diameter of a bubble cross-section, the diameter is measured if the cross-section is circular, the major axis is measured if the cross-section is elliptical, and the longest part is measured if the cross-section is irregularly shaped. The bubble diameter of the hardened body of the bubble-containing hydraulic composition is consistent with the bubble diameter of the bubble-containing hydraulic composition before hardening.

[0063] The bubble-containing hydraulic composition of the present invention can be manufactured using the foaming agent for hydraulic compositions of the present invention. In other words, the present invention provides a method for producing a bubble-containing hydraulic composition, comprising the following steps 1 and 2. <Process 1> A process to obtain foam by foaming a liquid composition containing the foaming agent for hydraulic compositions of the present invention and water. <Process 2> A process of mixing hydraulic powder, water, and foam obtained in step 1. Alternatively, in step 2, a hydraulic composition containing hydraulic powder and water may be prepared, and the hydraulic composition may be mixed with the foam obtained in step 1.

[0064] The foam-containing hydraulic composition of the present invention can be prepared by this manufacturing method. The manufacturing method for the foam-containing hydraulic composition of the present invention can appropriately apply the embodiments described in the foaming agent composition for hydraulic compositions and the foam-containing hydraulic composition of the present invention. In the manufacturing method for the foam-containing hydraulic composition of the present invention, the content and mass ratio of each component described in the foam-containing hydraulic composition of the present invention can be appropriately applied by replacing the content of each component with the mixing amount.

[0065] In step 1, from the viewpoint of aerating the liquid composition, the content (effective amount) of the foaming agent for hydraulic compositions of the present invention in the liquid composition is preferably 0.01% by mass or more, more preferably 0.015% by mass or more, and preferably 5% by mass or less, and more preferably 2% by mass or less.

[0066] In step 1, the foaming ratio (bubbling ratio) of the liquid composition depends on the intended use of the hydraulic composition, but from an economic standpoint, it is preferably 5 times or more, more preferably 7 times or more, and even more preferably 10 times or more. From the viewpoint of kneadability, it is preferably 30 times or less, more preferably 25 times or less, and even more preferably 20 times or less.

[0067] In step 2, depending on the intended use of the hydraulic composition, foam is mixed with the hydraulic composition in an amount preferably 50% or more by volume, more preferably 100% or more by volume, and even more preferably 150% or more by volume, from the viewpoint of reducing the specific gravity of the hardened body, and preferably 400% or less by volume, more preferably 300% or less by volume, and even more preferably 200% or less by volume, from the viewpoint of hardened body strength. In this manufacturing method, admixtures and additives known in the industry can be mixed in step 1 and / or step 2.

[0068] After step 2, step 3 below can be performed to produce a hardened body of the bubble-containing hydraulic composition. Step 3: A process of molding and curing the bubble-containing hydraulic composition slurry obtained in Step 2.

[0069] Furthermore, the bubble-containing hydraulic composition of the present invention can be manufactured using the foaming agent for hydraulic compositions of the present invention. In other words, the present invention provides a method for producing a bubble-containing hydraulic composition, comprising the following steps 1' and 2'. <Process 1'> A step of obtaining a liquid composition containing a foaming agent for hydraulic compositions of the present invention and water. <Process 2'> A step to obtain a foaming agent-containing hydraulic composition by mixing a hydraulic powder with the liquid composition obtained in step 1'. <Step 3'> A step of foaming the foaming agent-containing hydraulic composition obtained in the previous step.

[0070] The foam-containing hydraulic composition of the present invention can be prepared by this manufacturing method. The manufacturing method for the foam-containing hydraulic composition of the present invention can appropriately apply the embodiments described in the foaming agent composition for hydraulic compositions and the foam-containing hydraulic composition of the present invention. In the manufacturing method for the foam-containing hydraulic composition of the present invention, the content and mass ratio of each component described in the foam-containing hydraulic composition of the present invention can be appropriately applied by replacing the content of each component with the mixing amount.

[0071] In step 1', from the viewpoint of aerating the liquid composition, the content (effective amount) of the foaming agent for hydraulic compositions of the present invention in the liquid composition is preferably 0.001% by mass or more, more preferably 0.002% by mass or more, and preferably 5% by mass or less, more preferably 2% by mass or less.

[0072] In step 2', the hydraulic powder and the liquid composition obtained in step 1' may be mixed using mixing methods known in the industry. In this manufacturing method, admixtures and additives known in the industry may be mixed in step 1' and / or step 2'.

[0073] In step 2', the foaming agent-containing hydraulic composition obtained in the previous step may be foamed using a mixing mixer such as a pan-type forced mixer, a twin-screw forced mixer, a tiltable mixer, a Hobart mixer, a rotary mixer, a Hobart mixer, a W-type mixer, a V-type mixer, a drum-type mixer, a conical screw-type mixer, a ribbon mixer, a tumbler mixer, a double-cone mixer, a mill mixer, a juicer mixer, a hand mixer, or a Nauta mixer, preferably at a foaming ratio of 1.01 or higher, more preferably 1.03 or higher, and from the viewpoint of hardened body strength, preferably at a foaming ratio of 5 or lower, more preferably 3 or lower.

[0074] After step 2', step 3 below can be performed to produce a hardened body of the bubble-containing hydraulic composition. Step 3': A step to mold and harden the bubble-containing hydraulic composition slurry obtained in Step 2.

[0075] The specific gravity of the hardened body of the bubble-containing hydraulic composition obtained by the method for producing the bubble-containing hydraulic composition of the present invention is preferably 0.3 or higher, more preferably 0.4 or higher, and even more preferably 0.5 or higher from the viewpoint of the strength of the hardened body, and preferably 2.5 or lower, more preferably 2.0 or lower, and even more preferably 1.5 or lower from the viewpoint of ease of handling. The average bubble diameter of the cured body of the bubble-containing hydraulic composition obtained by the method for producing the bubble-containing hydraulic composition of the present invention is preferably 100 μm or more, more preferably 150 μm or more, from the viewpoint of the strength of the cured body, and preferably 400 μm or less, more preferably 300 μm or less, from the viewpoint of improving the aesthetic appearance of the cured hydraulic composition. [Examples]

[0076] The components used in the examples and comparative examples are shown below. <(A1) component> C12AS·Na: Sodium dodecyl sulfate, manufactured by Kao Corporation. C12 / 14 / 16AS·TEA: Sodium alkyl sulfate (molar ratio: 12 / 14 / 16 carbon atoms = 74 / 22 / 4), manufactured by Kao Corporation. C12 / 14 / 16AS·Na: Sodium alkyl sulfate (molar ratio: 12 / 14 / 16 carbon atoms = 74 / 22 / 4), manufactured by Kao Corporation.

[0077] <(A2) component> (A21) Ingredients C10AS·Na: Sodium decyl sulfate, manufactured by Kao Corporation. (A22) Ingredients C12 / 14AES·Na: Sodium polyoxyethylene (average number of added moles: 2) alkyl sulfate (molar ratio: 12 / 14 carbon atoms = 74 / 26), manufactured by Kao Corporation. Fatty Acids / TEA: Fatty acid triethanolamine salt (molar ratio: 12 / 14 / 16 / 18 / 18 unsaturated / 28 unsaturated = 13 / 3 / 6 / 1 / 70 / 7), manufactured by Kao Corporation.

[0078] <(B) component> C12OH: 1-Dodecyl alcohol, manufactured by Kao Corporation. <(C) component> C14OH: 1-Tetradecyl alcohol, manufactured by Kao Corporation. C16OH: 1-Hexyldecyl alcohol, manufactured by Kao Corporation.

[0079] Example 1 and Comparative Example 1, Example 2 and Comparative Example 2 (1) Preparation of foaming agents for hydraulic compositions The foaming agents for hydraulic compositions shown in Example 1 and Comparative Example 1 (Table 1), and Example 2 and Comparative Example 2 (Table 2) were prepared by the following method. Each raw material was added in a predetermined ratio to a total of 30 g in a 50 mL screw tube, and the mixture was stirred at 1000 rpm for 30 minutes using a stirring bar to prepare a foaming agent for hydraulic compositions with uniform and transparent properties.

[0080] (2) Preparation of hydraulic composition slurry A foaming agent for hydraulic compositions was prepared and mixed with water in a mass ratio of 0.3 to 99.7 to prepare an aqueous solution with a concentration (in form) of 0.3% by mass of the foaming agent for hydraulic compositions. 49.5 g of this prepared aqueous solution was added to a 1 L disposable cup, and the mixture was stirred by hand for 60 seconds at 2000 rpm (EUROSTAR200 control, IKA Japan Co., Ltd.) using a flat 6-blade paddle (FP-50, manufactured by AS ONE Corporation), while rotating the container by hand. After setting the container down, the mixture was stirred for another 30 seconds to obtain foam. 60g of calcined gypsum (Sakura brand calcined gypsum grade A, manufactured by Yoshino Gypsum Co., Ltd.), 240g of ordinary Portland cement (two-type mixture: Taiheiyo Cement / Sumitomo Osaka Cement = 1 / 1, mass ratio), 115.5g of tap water, and 0.48g of water-reducing agent (methacrylic acid / ω-methoxypolyethylene glycol (23 mol) monomethacrylate = 73 / 27 mol%) were added to a 500mL disposable cup, and the mixture was stirred for 5 seconds at setting 3 using a hand mixer (MK-H4, manufactured by Panasonic Corporation) to prepare a hydraulic composition slurry before foam addition. The entire amount of the prepared hydraulic composition slurry was added to 49.5g of foam prepared in a 1L disposable cup, and the mixture was kneaded in the 1L disposable cup at 1150 rpm for 10 seconds using the flat 6-blade paddle blade to obtain a hydraulic composition slurry containing air bubbles. The temperature of both the foam and the hydraulic composition slurry used for mixing was 20°C.

[0081] (3) Measurement of air content in hydraulic composition slurry The obtained hydraulic composition slurry containing air bubbles was poured into a mold (Plamold, manufactured by Nifco Corporation) for a cylindrical specimen with a diameter of 5 cm and a height of 10 cm, and its weight was measured. The specific gravity of the hardened hydraulic composition was calculated by dividing the weight of the poured hydraulic composition slurry by the volume of the mold. In addition, the amount of air (volume %) in the hydraulic composition slurry obtained above was measured in accordance with JIS A1128:2019. The results are shown in Tables 1 and 2. Furthermore, assuming that the amount of air in the hydraulic composition slurry is approximately equal to the amount of air in the hardened hydraulic composition, the values ​​shown in Table 1 are considered to be the "amount of air in the hardened hydraulic composition."

[0082] (4) Production of hardened bodies of hydraulic compositions The resulting water-hardening composition slurry containing air bubbles was poured into a mold (Plamold, manufactured by Nifco Corporation) with a diameter of 5 cm and a height of 10 cm, and left to stand at 20°C for 24 hours. The hardened water-hardening composition was demolded from the mold.

[0083] (5) Measurement of the average bubble diameter in the hardened hydraulic composition A cross-section of the hardened hydraulic composition was created by making an incision at a height of 5 cm. The cross-section was photographed with a digital microscope (DSX1000, OLYMPUS Corporation, 42x magnification), and the diameters of 100 randomly selected bubble cross-sections were measured. The average bubble diameter was calculated from the arithmetic mean of these values. For measuring the diameter of the bubble cross-section, the diameter was used if the bubble cross-section was circular, the major axis if the bubble cross-section was elliptical, and the longest part if the bubble cross-section was irregular in shape. The results are shown in Tables 1 and 2.

[0084] (6) Calculation of the number of microbubbles in the hardened hydraulic composition A cross-section of the hardened hydraulic composition was created by making an incision at a height of 5 cm. The cross-section was photographed with a digital microscope (DSX1000, OLYMPUS Corporation, 42x magnification), and the diameter of 100 randomly selected bubble cross-sections was measured to calculate the number of microbubbles, i.e., bubbles of 200 μm or less. The results are shown in Tables 1 and 2.

[0085] [Table 1]

[0086] [Table 2]

[0087] In Tables 1 and 2, the formulations of components (A1) and (A2) are apparent amounts (mass%) based on their effective content. The values ​​in parentheses ( ) listed alongside the amounts indicate the sodium salt equivalent. Furthermore, the content (mass%) and mass ratios marked with *1 indicate the values ​​obtained by converting the (A1) or (A2) components used to sodium salt equivalents. In the foaming agents for hydraulic compositions listed in the tables, all components other than those listed in the tables are water.

[0088] Examples 1 and 2 confirmed that, with the foaming agent for hydraulic compositions of the present invention, it is possible to introduce a large amount of bubbles while keeping the amount of foaming agent added to the hydraulic composition slurry constant, thereby reducing the specific gravity of the hardened body of the hydraulic composition. Furthermore, from Examples 1 and 2, it was confirmed that the foaming agent for hydraulic compositions of the present invention can introduce a large number of bubbles smaller than 200 μm, thereby improving the surface aesthetics of the hardened hydraulic composition. The foaming agent for hydraulic compositions of the present invention was confirmed to be able to introduce a large number of fine bubbles, and the hardened body of a hydraulic composition containing the foaming agent for hydraulic compositions of the present invention is expected to have excellent resistance to freeze-thaw damage.

[0089] Formulation example 1 The foaming agents for hydraulic compositions shown in Table 3 were prepared by the following method. Each raw material was added in the specified proportions to a total of 30 g in a 50 mL screw-top tube, and stirred with a stirring bar at 1000 rpm for 30 minutes to prepare a foaming agent for hydraulic compositions with uniform and transparent properties. The composition of each component in Table 3 is the amount (mass%) based on the effective amount. In the foaming agents for hydraulic compositions in Table 3, all components other than those listed in the table are water.

[0090] [Table 3]

[0091] (7) Preparation of mortar (mix example 2) In a mortar mixer (a Hobart-type mixer as described in JIS R 5201), the fine aggregate (S) (half the amount), cement (C) and slag (BFS), and the remaining fine aggregate (S) were added in the order shown in Table 4. After dry mixing for 10 seconds, mixing water (W) containing the foaming agent for hydraulic compositions (Example 1) shown in Table 3 was added. Then, the mixture was thoroughly mixed in the mortar mixer at low speed for 90 seconds to prepare the mortar (hydraulic composition of Example 2). The mixing conditions for the mortar other than the foaming agent for hydraulic compositions (Example 1) were as shown in Table 4.

[0092] [Table 4]

[0093] The components used in Table 4 are shown below. W: Wakayama City tap water C: Ordinary Portland cement (2-type mixture: Taiheiyo Cement / Sumitomo Osaka Cement = 1 / 1, mass ratio), density 3.16 g / cm³ 3 BFS: Blast furnace slag fine powder, product name "Esment 4000", manufactured by Nippon Steel Blast Furnace Cement Co., Ltd., density 2.89 g / cm³ 3 S: Joyo mountain sand density 2.55g / cm 3

[0094] In Table 4, W / C is the mass ratio of the amount of water to the amount of hydraulic powder (cement(C)), and is calculated as [amount of water(W) / amount of cement(C)] × 100 (mass%). Furthermore, W / P is the mass ratio of the amount of water to the total amount of hydraulic powder (cement (C)) and non-hydraulic powder (slag (BFS)), and is calculated as [amount of water (W) / (amount of cement (C) + amount of slag (BFS)] × 100 (mass%).

[0095] The amount of air in the hardened slurry of the hydraulic composition, as described in (3) above, was measured for the mortars shown in Table 5 (hydraulic compositions of formulation examples 2-1 to 2-3). Furthermore, assuming that the amount of air in the hydraulic composition slurry is approximately equal to the amount of air in the hardened hydraulic composition, the amount of air in the mortar shown in Table 5 is considered to be the "amount of air in the hardened hydraulic composition."

[0096] [Table 5]

Claims

1. A foaming agent for hydraulic compositions, comprising the following component (A1) and (B) a monohydric alcohol having a hydrocarbon group with 12 carbon atoms [hereinafter referred to as component (B)], wherein the mass ratio of the content of component (B) to the content of component (A1) [(B) / (A1)] is 0.005 or more and 0.045 or less. (A1) Components: One or more selected from alkyl or alkenyl sulfate esters having a C12 alkyl or alkenyl group and their salts.

2. Furthermore, the foaming agent for hydraulic compositions according to claim 1, further comprising the following component (A2). (A2) Ingredients: One or more surfactants selected from ingredients other than (A1)

3. The foaming agent for hydraulic compositions according to claim 2, wherein component (A2) contains one or more selected from alkyl or alkenyl sulfate esters other than component (A1) and their salts.

4. The foaming agent for hydraulic compositions according to claim 2, wherein as component (A2), it contains one or more selected from alkyl or alkenyl sulfate esters having an alkyl or alkenyl group having 8 to 10 carbon atoms and salts thereof [hereinafter, component (A21)].

5. The foaming agent for hydraulic compositions according to claim 2, wherein the mass ratio of the content of component (A1) to the content of component (A2), [(A1) / (A2)], is 0.3 or more and 4 or less.

6. The foaming agent for hydraulic compositions according to claim 4, wherein the content of component (A21) in component (A2) is 20% by mass or more and 100% by mass or less.

7. Furthermore, the foaming agent for hydraulic compositions according to claim 1 or 2, further comprising (C) a monohydric nonionic alcohol (excluding component (B)) with a LogP of 0 or more and 7.0 or less.

8. A bubble-containing hydraulic composition containing hydraulic powder, water, the following component (A1), and a monohydric alcohol having a hydrocarbon group with 12 carbon atoms (hereinafter referred to as component (B)), wherein the mass ratio of the content of component (B) to the content of component (A1) [(B) / (A1)] is 0.005 or more and 0.045 or less. (A1) Components: One or more selected from alkyl or alkenyl sulfate esters having a C12 alkyl or alkenyl group and their salts.

9. The bubble-containing hydraulic composition according to claim 8, wherein the hydraulic powder is one or more selected from cement and gypsum.

10. Furthermore, the bubble-containing hydraulic composition according to claim 8 or 9, further comprising the component (A2) below. (A2) Ingredients: One or more surfactants selected from ingredients other than (A1)

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