Foaming agent composition for hydraulic composition

Abstract

To provide a foaming agent composition for a hydraulic composition, a hydraulic composition containing bubbles, and a method for producing the same by which the strength of a hardened body of the hydraulic composition can be enhanced by increasing the bubble diameter in the hydraulic composition as compared to a case where the hydraulic composition has the same specific gravity.SOLUTION: A foaming agent composition for a hydraulic composition comprises the following (A1) component, optionally the following (A2) component, and the following (B) component, and a mass ratio of the content of the (A1) component to the total content of the (A1) component and the (A2) component (A1) / [(A1)+(A2)] is 0.8 or more and 1 or less. (A1) component is one or more kinds selected from alkyl or alkenyl sulfate having alkyl or alkenyl groups with 8 to 10 carbon atoms and their salts. (A2) component is one or more kinds selected from surfactant other than (A1) component. (B) component is monohydric alcohol with 6 to 10 carbon atoms.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a foaming agent composition for hydraulic compositions, a foam-containing hydraulic composition, and a method for producing the same. [Background technology]

[0002] Lightweight hydraulic compositions using cement or gypsum as a hardening agent are made by introducing air bubbles. Typically, a lightweight, bubble-containing hydraulic composition is produced by foaming a liquid composition containing a foaming agent composition and water, and then mixing the foam with the hydraulic composition, or by mixing it with fine aggregate or various admixtures.

[0003] Patent Document 1 discloses a gypsum board comprising a hardened gypsum core placed between two cover sheets, wherein the hardened gypsum core comprises a gypsum crystal matrix formed from at least water, stucco, and a foam, and the foam is formed from a foaming agent comprising at least one alkyl sulfate, at least one alkyl ether sulfate, or any combination thereof, and an aliphatic alcohol. The examples disclose that the foaming agent was alkyl ether sulfate and alkyl sulfate in a 40:60 ratio, 1-decanol was used as the aliphatic alcohol, and the void size of the core of the resulting board was arithmetic mean 245 μm.

[0004] Patent Document 2 describes a combination of gypsum and water, with formula H(CH2) n OSO3 - M + A gypsum composition containing a surfactant composition comprising an alkyl sulfate, wherein n is 6 to 16, and n is the average number of carbon atoms in the alkyl sulfate composition. m A composition is disclosed in which is 10-11 and M is a monovalent cation. In the examples, the amount of foam formed after mixing with water and stirring in a mixer is measured as an evaluation of the surfactant composition. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Special Publication No. 2018-535909 [Patent Document 2] Special Publication No. 2004-529050 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] While the hardened bodies of buoyant hydraulic compositions using cement or gypsum as a hardening agent can be made lighter by reducing their specific gravity due to the inclusion of buoyants, this lightness also leads to a decrease in strength. Increasing the buoyant diameter can be considered as a way to suppress the decrease in strength, but existing technologies have limitations in increasing the buoyant diameter. Therefore, there is a need to establish a technology that can increase the buoyant diameter of hardened bodies of buoyant hydraulic compositions, thereby achieving both lightness and strength.

[0007] The present invention provides a foaming agent composition for hydraulic compositions, a bubble-containing hydraulic composition, and a method for producing the same, which can increase the strength of a hardened hydraulic composition by increasing the diameter of the bubbles in the hydraulic composition, even if the hydraulic composition contains bubbles and has the same specific gravity. [Means for solving the problem]

[0008] The present invention relates to a foaming agent composition for hydraulic compositions, comprising the following component (A1), optionally the following component (A2), and the following component (B), wherein 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. (A1) Components: One or more selected from alkyl or alkenyl sulfate esters having an alkyl or alkenyl group with 8 to 10 carbon atoms, and their salts. (A2) Ingredients: One or more surfactants selected from ingredients other than (A1) (B) Component: Monohydric alcohol with 6 to 10 carbon atoms

[0009] The present invention also relates to a bubble-containing hydraulic composition containing a hydraulic powder, water, component (A1), optionally component (A2), and component (B), wherein 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.

[0010] The present invention also relates to a method for producing a bubble-containing hydraulic composition, comprising the following steps 1 and 2. <Process 1> A step of foaming a liquid composition containing the foaming agent composition for hydraulic compositions of the present invention and water to obtain foam. <Process 2> A step of mixing the foam obtained in step 1 with a hydraulic composition containing hydraulic powder and water. [Effects of the Invention]

[0011] According to the present invention, even if the hydraulic composition containing air bubbles has the same specific gravity, the strength of the hardened hydraulic composition can be increased by increasing the diameter of the air bubbles in the hydraulic composition. The present invention provides a foaming agent composition for hydraulic compositions, an air bubble-containing hydraulic composition, and a method for producing the same. [Modes for carrying out the invention]

[0012] The reason why the foaming agent composition for hydraulic compositions of the present invention can increase the strength of the hardened hydraulic composition by increasing the diameter of bubbles in the hydraulic composition is not entirely clear, but it is presumed to be as follows. Conventionally, as disclosed in Patent Document 2, for example, the size of bubbles in a hydraulic composition has been controlled by adjusting the foaming performance in the aqueous system when a liquid composition containing a foaming agent composition for hydraulic compositions and water is foamed. The inventors focused not only on foam performance in aqueous systems but also on foam performance in hydraulic compositions, and discovered that, given the same specific gravity, increasing the bubble diameter in the hydraulic composition can increase its strength. The inventors of the present invention have found that in conventional methods that control only the foam performance in an aqueous system, it is necessary to satisfy certain levels of foam performance, such as foaming ability and foam stability, in order to introduce a certain amount of foam into the hydraulic composition. Consequently, bubbles become stable in the hydraulic composition, coalescence does not progress, and the bubble diameter cannot be increased. Therefore, the inventors have found that the aforementioned problems can be solved by controlling the foaming performance in aqueous systems, particularly the foaming ability, and the foaming rate in the hydraulic composition. More specifically, the aforementioned problem is solved by combining an alkyl or alkenyl sulfate ester having a short-chain alkyl or alkenyl group as component (A1) and a short-chain monohydric alcohol as component (B). In water, component (A1) forms micelles, and component (B), having low affinity for water, is incorporated into the micelles formed by component (A1). Simultaneously, component (B) rapidly adsorbs to the gas-liquid interface of the micelles, lowering the surface tension. This dramatically improves foaming ability in aqueous systems. On the other hand, components (A1) and (B) have short carbon chain lengths, resulting in poor foam stability. In hydraulic compositions, however, they promote bubble coalescence, increasing the bubble diameter. It is presumed that this allows for both foaming ability in aqueous systems and bubble coalescence in hydraulic compositions to be achieved. However, the present invention is not limited to the above-described mechanism of expression.

[0013] [Foaming agent composition for hydraulic composition] <(A1) component> The foaming agent composition for hydraulic compositions of the present invention contains, as component (A1), one or more selected from alkyl or alkenyl sulfate esters having an alkyl or alkenyl group with 8 to 10 carbon atoms, and salts thereof. Component (A1) has 8 or more carbon atoms and 10 or fewer carbon atoms, preferably 10 alkyl or alkenyl groups, and preferably alkyl groups, from the viewpoint of increasing the diameter of bubbles in 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.

[0014] (A1) component specifically includes one or more selected from octyl sulfate, decyl sulfate, 2-ethylhexyl sulfate, 2-propylheptyl sulfate, and salts thereof. From the viewpoints of increasing the bubble diameter in the hydraulic composition and reducing the addition amount to the hydraulic composition, it is preferably one or more selected from octyl sulfate, decyl sulfate, and salts thereof, more preferably one or more compounds selected from decyl sulfate and salts thereof. These compounds can reduce the addition amount when obtaining a specific bubble diameter. One or more compounds selected from decyl sulfate and salts thereof preferably account for 80% by mass or more, more preferably 90% by mass or more, still more preferably 95% by mass or more, even more preferably 97% by mass or more, and preferably 100% by mass or less, and more preferably substantially 100% by mass in the (A1) component. Also, from the viewpoint of obtaining a larger bubble diameter in the hydraulic composition, the (A1) component preferably contains one or more compounds selected from octyl sulfate, 2-ethylhexyl sulfate, decyl sulfate, and salts thereof. One or more compounds selected from octyl sulfate, 2-ethylhexyl sulfate, decyl sulfate, and salts thereof preferably account for 80% by mass or more, more preferably 90% by mass or more, and preferably 100% by mass or less, and more preferably substantially 100% by mass in the (A1) component.

[0015] As component (A1), it contains one or more selected from alkyl or alkenyl sulfates having an alkyl or alkenyl group with 8 carbon atoms such as octyl sulfate and 2-ethylhexyl sulfate, and their salts (hereinafter referred to as C8AS), and one or more selected from alkyl or alkenyl sulfates having an alkyl or alkenyl group with 10 carbon atoms such as decyl sulfate and their salts (hereinafter referred to as C10AS). In this case, from the viewpoint of obtaining a larger bubble diameter in the hydraulic composition, the mass ratio (C8AS / C10AS) of the content of C8AS to the content of C10AS in component (A1) is preferably 0.4 or more, more preferably 0.6 or more, still more preferably 0.8 or more, and preferably 1.6 or less, more preferably 1.4 or less, still more preferably 1.2 or less.

[0016] <Component (A2)> The foaming agent composition for the hydraulic composition of the present invention may optionally contain one or more selected from surfactants other than component (A1) as component (A2). Examples of component (A2) include one or more selected from anionic surfactants, nonionic surfactants, cationic surfactants, and amphoteric surfactants other than component (A1). From the viewpoint of increasing the large bubble diameter in the hydraulic composition, it is preferable that component (A2) contains one or more selected from anionic surfactants and nonionic surfactants. More preferably, it contains one or more selected from alkyl or alkenyl sulfates other than component (A1) and their salts (hereinafter referred to as component (A21)), one or more selected from polyoxyalkylene alkyl or alkenyl ethersulfates having an alkyl or alkenyl group with 8 to 16 carbon atoms and their salts (hereinafter referred to as component (A22)), and glycoside-type nonionic surfactants (hereinafter referred to as component (A23)). The total content of anionic surfactants and nonionic surfactants, preferably the total content of component (A21), component (A22), and component (A23) is preferably 80% by mass or more, more preferably 90% by mass or more in component (A2), and preferably 100% by mass or less, more preferably substantially 100% by mass.

[0017] 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.

[0018] Examples of 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. When a nonionic surfactant is included as component (A2), it is preferable to include a glycoside-type nonionic surfactant from the viewpoint of increasing the diameter of bubbles in the hydraulic composition. When a nonionic surfactant is included as component (A2), the content of the glycoside-type nonionic surfactant is preferably 80% by mass or more, more preferably 90% by mass or more, and preferably 100% by mass or less, and substantially more preferably 100% by mass, in the total content of component (A2).

[0019] 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.

[0020] Examples of amphoteric surfactants include one or more selected from alkyldimethylamine oxide, alkyldimethylaminoacetic acid betaine, alkylhydroxysulfobetaine, alkylamidopropyl betaine, and alkylcarboxymethylhydroxyethylimidazolium betaine.

[0021] The foaming agent composition for hydraulic compositions of the present invention may contain, from the viewpoint of reducing the amount added to the hydraulic composition, one or more alkyl or alkenyl sulfate esters other than component (A1) and their salts (hereinafter referred to as component (A21)) as component (A2). When component (A2) contains component (A21), the content of component (A21) is preferably 80% by mass or more, more preferably 90% by mass or more, and preferably 100% by mass or less, and even more preferably substantially 100% by mass, of component (A2). Component (A21) preferably has an alkyl or alkenyl group having 12 or more carbon atoms, preferably 18 or fewer, and more preferably 16 or fewer carbon atoms, from the viewpoint of reducing the amount added to the hydraulic composition. (A21) The salt of component (A21) may be one or more selected from alkali metal salts such as sodium salts and potassium salts, ammonium salts, and organic ammonium salts.

[0022] (A21) Specifically, the component may be one or more selected from lauryl sulfate, tridecyl sulfate, myristyl sulfate, cetyl sulfate, stearyl sulfate, oleyl sulfate, and salts thereof. From the viewpoint of solubility in water, it is preferably one or more selected from lauryl sulfate, tridecyl sulfate, myristyl sulfate, and salts thereof.

[0023] The foaming agent composition for hydraulic compositions of the present invention may contain, from the viewpoint of reducing the amount added to the hydraulic composition, one or more selected from polyoxyalkylene alkyl or alkenyl ether sulfate esters having an alkyl or alkenyl group with 8 to 16 carbon atoms, and their salts (hereinafter referred to as component (A22)) as component (A2). When component (A2) contains component (A22), the content of component (A22) is preferably 80% by mass or more, more preferably 90% by mass or more, and preferably 100% by mass or less, and even more preferably substantially 100% by mass, of component (A2). Component (A22) preferably has an alkyl or alkenyl group having 8 or more carbon atoms, more preferably 10 or more, even more preferably 12 or more, and preferably 18 or fewer, more preferably 16 or fewer, and even more preferably 14 or fewer carbon atoms, from the viewpoint of reducing the amount added to the hydraulic composition. The oxyalkylene group of component (A22) is an oxyethylene group or an oxypropylene group, preferably an oxyethylene group, and the average number of moles of oxyalkylene groups added is preferably 1 or more, more preferably 2 or more, from the viewpoint of solubility in water, and preferably 10 or less, more preferably 6 or less, and even more preferably 4 or less, from the viewpoint of reducing the amount added to the hydraulic composition. (A22) 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 are 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, polyoxyethylene polyoxypropylene lauryl ether Examples include polyoxyethylene decyl ether sulfate, 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 properties, it is preferably polyoxyethylene decyl ether sulfate, polyoxyethylene lauryl ether sulfate, polyoxyethylene myristyl ether sulfate, polyoxypropylene decyl ether sulfate, polyoxyethylene polyoxypropylene decyl ether sulfate, polyoxyethylene polyoxypropylene lauryl ether sulfate, polyoxyethylene polyoxypropylene myristyl ether sulfate, and one or more selected from these salts.

[0025] From the perspective of reducing the amount added to the hydraulic composition, the foaming agent composition for the hydraulic composition may contain a glycoside-type nonionic surfactant (hereinafter referred to as component (A23)) as component (A2). When component (A23) is contained as component (A2), the content of component (A23) is preferably 80% by mass or more, more preferably 90% by mass or more, and preferably 100% by mass or less, and more preferably substantially 100% by mass in component (A2). The glycoside-type nonionic surfactant is more preferably a compound represented by the following general formula (a23). R 1a -(OR 2a ) x G y (a23) [In the formula, R 1a is a linear alkyl group having 8 or more, preferably 10 or more, and 16 or less, preferably 14 or less carbon atoms. R 2a is an alkylene group having 2 to 4 carbon atoms, preferably an ethylene group or a propylene group, more preferably an ethylene group. G is a residue derived from a reducing sugar. x is a number with an average value of 0 or more and 6 or less. y represents a number with an average value of 1 or more and 10 or less, preferably 5 or less, more preferably 2 or less.]

[0026] In the compound of the general formula (a23), G is a residue derived from a reducing sugar. The reducing sugar as the raw material of G may be either an aldose or a ketose. Examples of the reducing sugar as the raw material of G include triose having 3 carbon atoms, tetrose having 4 carbon atoms, pentose having 5 carbon atoms, and hexose having 6 carbon atoms. Specific examples of aldose include apiose, arabinose, galactose, glucose, lyxose, mannose, gulose, aldose, idose, talose, and xylose. Specific examples of ketose include fructose. The reducing sugar as the raw material of G in the present invention is preferably an aldopentose which is an aldose having 5 carbon atoms or an aldohexose which is an aldose having 6 carbon atoms, and more preferably glucose.

[0027] <Component (B)> The foaming agent composition for hydraulic compositions of the present invention contains a monohydric alcohol having 6 to 10 carbon atoms as component (B). (B) The number of carbon atoms in component (B) is 6 or more, and 10 or less, preferably 8, from the viewpoint of rapid foaming and foam stability. Component (B) is a monohydric alcohol having a linear or branched hydrocarbon group, preferably a linear or branched alkyl group, and more preferably a linear alkyl group, from the viewpoint of rapid foaming and foam stability.

[0028] Component (B) specifically includes one or more selected from hexanol, octanol, decanol, 2-ethylhexanol, and 2-propylheptanol. From the viewpoint of effervescence, it is preferable to contain one or more selected from octanol and decanol, and more preferably octanol. The content of one or more selected from octanol and decanol is preferably 80% by mass or more, more preferably 90% by mass or more, and preferably 100% by mass or less, and even more preferably substantially 100% by mass, in component (B). Furthermore, the content of octanol is preferably 80% by mass or more, more preferably 90% by mass or more, and preferably 100% by mass or less, and even more preferably substantially 100% by mass, in component (B).

[0029] <Composition, etc.> The foaming agent composition for hydraulic compositions of the present invention contains component (A1) in an amount of preferably 15% by mass or more, more preferably 20% by mass or more, and even more preferably 25% by mass or more, from the viewpoint of reducing the amount added, and preferably 80% by mass or less, more preferably 60% by mass or less, even more preferably 40% by mass or less, and even more preferably 30% by mass or less, from the viewpoint of ease of addition such as fluidity. In this invention, the specification regarding the mass of component (A1) shall be based on the value converted to the sodium salt.

[0030] The foaming agent composition for hydraulic compositions of the present invention, when it contains component (A2), contains component (A2) in an amount of preferably 0.5% by mass or more, more preferably 1.0% by mass or more, and even more preferably 1.2% by mass or more, from the viewpoint of foaming properties, and preferably 15% by mass or less, more preferably 10% by mass or less, even more preferably 5% by mass or less, even more preferably 3% by mass or less, and even more preferably 2% by mass or less, from the viewpoint of increasing the diameter of bubbles in the hydraulic composition. In this invention, the mass of the anionic surfactant contained in component (A2) shall be the value converted to a sodium salt. Furthermore, the mass of the cationic surfactant contained in component (A2) shall be the value converted to a chloride salt.

[0031] The foaming agent composition for hydraulic compositions of the present invention contains component (B) in an amount of preferably 0.5% by mass or more, more preferably 1.0% by mass or more, and even more preferably 1.5% by mass or more, from the viewpoint of increasing the diameter of bubbles in the hydraulic composition, and preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 3% by mass or less, from the viewpoint of increasing the diameter of bubbles in the hydraulic composition and reducing odor.

[0032] In the foaming agent composition for hydraulic compositions of the present invention, 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, preferably 0.85 or more, more preferably 0.9 or more, and even more preferably 0.95 or more, from the viewpoint of increasing the diameter of bubbles in the hydraulic composition, and is 1 or less from the viewpoint of increasing the diameter of bubbles and foaming properties in the hydraulic composition.

[0033] In the foaming agent composition for hydraulic compositions of the present invention, the mass ratio (B) / (A1) of the content of component (B) to the content of component (A1) is preferably 0.01 or more, more preferably 0.03 or more, and even more preferably 0.05 or more, from the viewpoint of reducing the specific gravity of the hardened hydraulic composition, and preferably 0.30 or less, more preferably 0.20 or less, and even more preferably 0.10 or less, from the viewpoint of homogenizing the bubble diameter in the hydraulic composition.

[0034] In the foaming agent composition for hydraulic compositions of the present invention, the mass ratio (B) / [(A1)+(A2)] of the content of component (B) to the total content of components (A1) and (A2) is preferably 0.005 or more, more preferably 0.01 or more, even more preferably 0.03 or more, and even more preferably 0.05 or more, from the viewpoint of increasing the diameter of bubbles and foaming properties in the hydraulic composition, and preferably 0.30 or less, more preferably 0.25 or less, even more preferably 0.15 or less, and even more preferably 0.10 or less, from the viewpoint of increasing the diameter of bubbles and reducing odor in the hydraulic composition.

[0035] The foaming agent composition for hydraulic compositions of the present invention, when it contains component (A21), contains component (A21) in an amount of preferably 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably 0.9% by mass or more, and preferably 15% by mass or less, more preferably 10% by mass or less, even more preferably 5% by mass or less, even more preferably 3% by mass or less, even more preferably 2.5% by mass or less, and even more preferably 1.5% by mass or less, from the viewpoint of increasing the diameter of bubbles in the hydraulic composition. In this invention, the specification regarding the mass of component (A21) shall be based on the value converted to the sodium salt.

[0036] In the foaming agent composition for hydraulic compositions of the present invention, when component (A21) is included, the mass ratio (A1) / [(A1)+(A21)] of the content of component (A1) to the total content of components (A1) and (A21) is 0.8 or more, preferably 0.85 or more, more preferably 0.9 or more, from the viewpoint of increasing the diameter of bubbles in the hydraulic composition, and 1 or less, preferably 0.95 or less, from the viewpoint of increasing the diameter of bubbles and foaming properties in the hydraulic composition.

[0037] In the foaming agent composition for hydraulic compositions of the present invention, when component (A21) is included, the mass ratio (B) / [(A1)+(A21)] of the content of component (B) to the total content of components (A1) and (A21) is preferably 0.005 or more, more preferably 0.01 or more, even more preferably 0.03 or more, and even more preferably 0.05 or more, from the viewpoint of increasing the diameter of bubbles and foaming properties in the hydraulic composition, and preferably 0.3 or less, more preferably 0.25 or less, even more preferably 0.15 or less, and even more preferably 0.10 or less, from the viewpoint of increasing the diameter of bubbles and reducing odor in the hydraulic composition.

[0038] The foaming agent composition for hydraulic compositions of the present invention, when it contains component (A22), contains component (A22) in an amount of preferably 0.5% by mass or more, more preferably 1.0% by mass or more, even more preferably 1.25% by mass or more, and preferably 15% by mass or less, more preferably 10% by mass or less, even more preferably 6% by mass or less, even more preferably 5% by mass or less, even more preferably 3% by mass or less, and even more preferably 2% by mass or less, from the viewpoint of increasing the diameter of bubbles in the hydraulic composition. In this invention, the specification regarding the mass of component (A22) shall be based on the value converted to the sodium salt.

[0039] In the foaming agent composition for hydraulic compositions of the present invention, when component (A22) is included, the mass ratio (A1) / [(A1)+(A22)] of the content of component (A1) to the total content of components (A1) and (A22) is 0.8 or more, preferably 0.85 or more, more preferably 0.9 or more, from the viewpoint of increasing the diameter of bubbles in the hydraulic composition, and 1 or less, preferably 0.95 or less, from the viewpoint of increasing the diameter of bubbles and foaming properties in the hydraulic composition.

[0040] In the foaming agent composition for hydraulic compositions of the present invention, when component (A22) is included, the mass ratio (B) / [(A1)+(A22)] of the content of component (B) to the total content of components (A1) and (A22) is preferably 0.005 or more, more preferably 0.01 or more, even more preferably 0.03 or more, and even more preferably 0.05 or more, from the viewpoint of increasing the diameter of bubbles and foaming properties in the hydraulic composition, and preferably 0.30 or less, more preferably 0.25 or less, even more preferably 0.15 or less, and even more preferably 0.10 or less, from the viewpoint of increasing the diameter of bubbles and reducing odor in the hydraulic composition.

[0041] The foaming agent composition for hydraulic compositions of the present invention, when it contains component (A23), contains component (A23) in an amount of preferably 0.5% by mass or more, more preferably 1.0% by mass or more, even more preferably 1.25% by mass or more, and preferably 15% by mass or less, more preferably 10% by mass or less, even more preferably 6% by mass or less, even more preferably 5% by mass or less, even more preferably 3% by mass or less, and even more preferably 2% by mass or less, from the viewpoint of increasing the diameter of bubbles in the hydraulic composition.

[0042] In the foaming agent composition for hydraulic compositions of the present invention, when component (A23) is included, the mass ratio (A1) / [(A1)+(A23)] of the content of component (A1) to the total content of components (A1) and (A23) is 0.8 or more, preferably 0.85 or more, more preferably 0.9 or more, from the viewpoint of increasing the diameter of bubbles in the hydraulic composition, and 1 or less, preferably 0.96 or less, from the viewpoint of increasing the diameter of bubbles and foaming properties in the hydraulic composition.

[0043] In the foaming agent composition for hydraulic compositions of the present invention, when component (A23) is included, the mass ratio (B) / [(A1)+(A23)] of the content of component (B) to the total content of components (A1) and (A23) is preferably 0.005 or more, more preferably 0.01 or more, even more preferably 0.03 or more, and even more preferably 0.045 or more, from the viewpoint of increasing the diameter of bubbles and foaming properties in the hydraulic composition, and preferably 0.30 or less, more preferably 0.25 or less, even more preferably 0.15 or less, and even more preferably 0.10 or less, from the viewpoint of increasing the diameter of bubbles and reducing odor in the hydraulic composition.

[0044] The foaming agent composition for hydraulic compositions of the present invention may contain water. The foaming agent composition for hydraulic compositions of the present invention preferably contains 10% by mass or more, preferably 20% by mass or more, more preferably 30% by mass or more, even more preferably 40% by mass or more, and preferably 90% by mass or less, more preferably 80% by mass or less, and even more preferably 70% by mass or less. In a foaming agent composition for hydraulic compositions containing component (A1), optionally component (A2), component (B), and water, the total content of component (A1), component (A2), and component (B) can be preferably 10% by mass or more, preferably 15% by mass or more, more preferably 20% by mass or more, even more preferably 25% by mass or more, and preferably 60% by mass or less, more preferably 50% by mass or less, and even more preferably 40% by mass or less, from the viewpoint of foaming properties.

[0045] The foaming agent composition for hydraulic compositions of the present invention may optionally contain thickeners, chelating agents, heavy metal scavengers, rust inhibitors, preservatives, colorants, fragrances, defoamers, solvents, dispersants, flocculants, water-soluble polymers, and the like. These that do not fall under components (A1), (A2), and (B) are used.

[0046] The foaming agent composition for hydraulic compositions of the present invention is obtained by mixing component (A1), component (A2), component (B), and an optional component. During mixing, the mixture may be heated as appropriate to reduce the viscosity of the solution.

[0047] Applications of the foaming agent composition for hydraulic compositions of the present invention include hydraulic compositions containing bubbles, such as gypsum slurry, lightweight milk (bubble milk, air milk), lightweight mortar (bubble mortar, air mortar), lightweight concrete (bubble concrete, air concrete), backfill material, interfill material, concrete blocks for construction, ALC (autoclaved lightweight concrete), grout material, porous ceramics, bricks, refractories, lightweight embankments, and mortar for pumping. In these bubble-containing hydraulic compositions, it is expected that the mixing of bubbles will impart functions such as weight reduction, strength improvement, fluidity improvement, heat insulation, heat resistance, viscosity imparting, and fluidity control. Among the hydraulic compositions containing these bubbles, the foaming agent composition for hydraulic compositions of the present invention is suitable for use in gypsum slurry.

[0048] [Bubble-containing hydraulic composition, and method for producing the same] A preferred method for producing a hydraulic composition containing bubbles is to foam the foaming agent composition for hydraulic compositions of the present invention and then incorporate it as foam into the hydraulic substance for blending and weight reduction, as this method ensures uniform bubble formation. The foaming agent composition for hydraulic compositions of the present invention, or a mixture thereof diluted with water, may be directly mixed into pastes, slurries, mortars, and concrete using cement or gypsum as the hydraulic substance. The method of adding the foaming agent composition for hydraulic compositions of the present invention to a hydraulic composition is not limited, nor is the method of foaming the foaming agent composition for hydraulic compositions of the present invention, or a mixture thereof diluted with water, into foam.

[0049] The present invention provides a bubble-containing hydraulic composition containing a hydraulic powder, water, component (A1), optionally component (A2), and component (B), wherein 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. The foam-containing hydraulic composition of the present invention can be appropriately modified according to the provisions described in the foaming agent composition for hydraulic compositions of the present invention. Components (A1), (A2), and (B) are the same as those described in the foaming agent composition for hydraulic compositions of the present invention.

[0050] Hydraulic powders are powders that harden through a hydration reaction, and examples include cement and gypsum, with gypsum being preferred. Examples of cements include ordinary Portland cement, beelite cement, moderate-heat cement, high-early-strength cement, ultra-high-early-strength cement, and sulfuric acid-resistant cement. Blast furnace slag cement, fly ash cement, silica fume cement, etc., which are made by adding blast furnace slag, fly ash, silica fume, stone powder (calcium carbonate powder), etc., to these cements are also acceptable.

[0051] The bubble-containing hydraulic composition of the present invention has a water / hydraulic powder ratio that is preferably 20% by mass or more, more preferably 30% by mass or more, even more preferably 40% by mass or more, and even more preferably 60% by mass or more, from the viewpoint of slurry fluidity, and preferably 100% by mass or less, more preferably 90% by mass or less, and even more preferably 80% 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 applies to other quantitative relationships of the hydraulic composition with respect to the hydraulic powder.

[0052] The bubble-containing hydraulic composition of the present invention contains component (A1) in an amount of preferably 0.005 parts by mass or more, more preferably 0.01 parts by mass or more, and even more preferably 0.015 parts by mass or more, per 100 parts by mass of hydraulic powder, from the viewpoint of reducing the specific gravity of the hardened body, and preferably 0.1 parts by mass or less, more preferably 0.08 parts by mass or less, and even more preferably 0.06 parts by mass or less, from the viewpoint of hardened body strength.

[0053] The bubble-containing hydraulic composition of the present invention, when it contains component (A2), contains component (A2) in an amount of preferably 0.0005 parts by mass or more, more preferably 0.0015 parts by mass or more, and even more preferably 0.0015 parts by mass or more, per 100 parts by mass of hydraulic powder, from the viewpoint of reducing the specific gravity of the hardened body, and preferably 0.015 parts by mass or less, more preferably 0.010 parts by mass or less, and even more preferably 0.005 parts by mass or less, from the viewpoint of hardened body strength.

[0054] The bubble-containing hydraulic composition of the present invention contains component (B) in an amount of 0.0001 parts by mass or more, more preferably 0.0005 parts by mass or more, even more preferably 0.001 parts by mass or more, even more preferably 0.0015 parts by mass or more, even more preferably 0.002 parts by mass or more, even more preferably 0.003 parts by mass or more, per 100 parts by mass of hydraulic powder, from the viewpoint of reducing the specific gravity of the hardened body, and from the viewpoint of hardened body strength, preferably 0.020 parts by mass or less, more preferably 0.015 parts by mass or less, even more preferably 0.010 parts by mass or less, and even more preferably 0.005 parts by mass or less.

[0055] In the bubble-containing hydraulic composition of the present invention, 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, preferably 0.85 or more, more preferably 0.9 or more, and even more preferably 0.95 or more, from the viewpoint of increasing the diameter of bubbles in the hydraulic composition, and is 1 or less from the viewpoint of increasing the diameter of bubbles and foaming properties in the hydraulic composition.

[0056] In the bubble-containing hydraulic composition of the present invention, the mass ratio (B) / (A1) of the content of component (B) to the content of component (A1) is preferably 0.01 or more, more preferably 0.03 or more, and even more preferably 0.05 or more, from the viewpoint of reducing the specific gravity of the hardened hydraulic composition, and preferably 0.30 or less, more preferably 0.20 or less, and even more preferably 0.10 or less, from the viewpoint of homogenizing the bubble diameter in the hydraulic composition.

[0057] In the bubble-containing hydraulic composition of the present invention, the mass ratio (B) / [(A1)+(A2)] of the content of component (B) to the total content of components (A1) and (A2) is preferably 0.005 or more, more preferably 0.01 or more, even more preferably 0.03 or more, and even more preferably 0.05 or more, from the viewpoint of increasing the diameter of bubbles and foaming properties in the hydraulic composition, and preferably 0.3 or less, more preferably 0.25 or less, even more preferably 0.15 or less, and even more preferably 0.10 or less, from the viewpoint of increasing the diameter of bubbles and reducing odor in the hydraulic composition.

[0058] The bubble-containing hydraulic composition of the present invention, when containing component (A21) as component (A2), contains component (A21) in an amount of 0.0001 parts by mass or more, preferably 0.0005 parts by mass or more, more preferably 0.0010 parts by mass or more, per 100 parts by mass of hydraulic powder, from the viewpoint of reducing the specific gravity of the hardened body, and from the viewpoint of hardened body strength, preferably 0.015 parts by mass or less, more preferably 0.010 parts by mass or less, and even more preferably 0.005 parts by mass or less.

[0059] In the bubble-containing hydraulic composition of the present invention, when component (A2) contains component (A21), the mass ratio (A1) / [(A1)+(A21)] of the content of component (A1) to the total content of components (A1) and (A21) is 0.8 or more, preferably 0.85 or more, more preferably 0.9 or more, from the viewpoint of increasing the diameter of bubbles in the hydraulic composition, and 1 or less, preferably 0.95 or less, from the viewpoint of increasing the diameter of bubbles and foaming properties in the hydraulic composition.

[0060] In the bubble-containing hydraulic composition of the present invention, when component (A2) contains component (A21), the mass ratio (B) / [(A1)+(A21)] of the content of component (B) to the total content of components (A1) and (A21) is preferably 0.005 or more, more preferably 0.01 or more, even more preferably 0.03 or more, and even more preferably 0.05 or more, from the viewpoint of increasing the diameter of bubbles and foaming properties in the hydraulic composition, and preferably 0.3 or less, more preferably 0.25 or less, even more preferably 0.15 or less, and even more preferably 0.10 or less, from the viewpoint of increasing the diameter of bubbles and reducing odor in the hydraulic composition.

[0061] The bubble-containing hydraulic composition of the present invention, when containing component (A22) as component (A2), contains component (A22) in an amount of preferably 0.0005 parts by mass or more, more preferably 0.0010 parts by mass or more, and even more preferably 0.0015 parts by mass or more, per 100 parts by mass of hydraulic powder, from the viewpoint of reducing the specific gravity of the hardened body, and preferably 0.015 parts by mass or less, more preferably 0.010 parts by mass or less, and even more preferably 0.005 parts by mass or less, from the viewpoint of hardened body strength.

[0062] In the bubble-containing hydraulic composition of the present invention, when component (A2) contains component (A22), the mass ratio (A1) / [(A1)+(A22)] of the content of component (A1) to the total content of components (A1) and (A22) is 0.8 or more, preferably 0.85 or more, more preferably 0.9 or more, from the viewpoint of increasing the diameter of bubbles in the hydraulic composition, and 1 or less, preferably 0.95 or less, from the viewpoint of increasing the diameter of bubbles and foaming properties in the hydraulic composition.

[0063] In the bubble-containing hydraulic composition of the present invention, when component (A2) contains component (A22), the mass ratio (B) / [(A1)+(A22)] of the content of component (B) to the total content of components (A1) and (A22) is preferably 0.005 or more, more preferably 0.01 or more, even more preferably 0.03 or more, and even more preferably 0.05 or more, from the viewpoint of increasing the diameter of bubbles and foaming properties in the hydraulic composition, and preferably 0.3 or less, more preferably 0.25 or less, even more preferably 0.15 or less, and even more preferably 0.10 or less, from the viewpoint of increasing the diameter of bubbles and reducing odor in the hydraulic composition.

[0064] The bubble-containing hydraulic composition of the present invention, when containing component (A23) as component (A2), contains component (A23) in an amount of 0.0005 parts by mass or more, more preferably 0.0010 parts by mass or more, and even more preferably 0.0015 parts by mass or more, per 100 parts by mass of hydraulic powder, from the viewpoint of reducing the specific gravity of the hardened body, and from the viewpoint of hardened body strength, preferably 0.015 parts by mass or less, more preferably 0.010 parts by mass or less, and even more preferably 0.005 parts by mass or less.

[0065] In the bubble-containing hydraulic composition of the present invention, when component (A2) contains component (A23), the mass ratio (A1) / [(A1)+(A23)] of the content of component (A1) to the total content of components (A1) and (A23) is 0.8 or more, preferably 0.85 or more, more preferably 0.9 or more, from the viewpoint of increasing the diameter of bubbles in the hydraulic composition, and 1 or less, preferably 0.96 or less, from the viewpoint of increasing the diameter of bubbles and foaming properties in the hydraulic composition.

[0066] In the bubble-containing hydraulic composition of the present invention, when component (A2) contains component (A23), the mass ratio (B) / [(A1)+(A23)] of the content of component (B) to the total content of components (A1) and (A23) is preferably 0.005 or more, more preferably 0.01 or more, even more preferably 0.03 or more, and even more preferably 0.045 or more, from the viewpoint of increasing the diameter of bubbles and foaming properties in the hydraulic composition, and preferably 0.30 or less, more preferably 0.25 or less, even more preferably 0.15 or less, and even more preferably 0.10 or less, from the viewpoint of increasing the diameter of bubbles and reducing odor in the hydraulic composition.

[0067] 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.

[0068] The specific gravity 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 strength, and preferably 0.9 or lower, more preferably 0.8 or lower, and even more preferably 0.7 or lower from the viewpoint of ease of handling.

[0069] The bubble-containing hydraulic composition of the present invention contains bubbles. From the viewpoint of improving the strength of the hardened body of the bubble-containing hydraulic composition of the present invention, the average bubble diameter is preferably 1250 μm or less, more preferably 1000 μm or less, even more preferably 800 μm or less, even more preferably 700 μm or less, even more preferably 650 μm or less, and even more preferably 600 μm or less. The average bubble diameter is calculated by preparing a hardened body of a bubble-containing hydraulic composition, cutting out a cross-section from the hardened body, observing the cross-section with a digital microscope, measuring the diameter of 100 randomly selected bubble cross-sections, and calculating the average value (arithmetic mean) of these measurements. Note that when measuring the diameter of a bubble cross-section, the diameter is measured if the cross-section is circular, the major axis if the cross-section is elliptical, and the longest part if the cross-section is irregularly shaped.

[0070] The bubble-containing hydraulic composition of the present invention can be manufactured using the bubble agent composition 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 foaming a liquid composition containing the foaming agent composition for hydraulic compositions of the present invention and water to obtain foam. <Process 2> A step of mixing the foam obtained in step 1 with a hydraulic composition containing hydraulic powder and water.

[0071] This manufacturing method allows for the preparation of the bubble-containing hydraulic composition of the present invention. The method for producing the bubble-containing hydraulic composition of the present invention can be appropriately applied to the embodiments described in the foaming agent composition for the hydraulic composition of the present invention and the bubble-containing hydraulic composition of the present invention. In the method for producing the bubble-containing hydraulic composition of the present invention, the content and mass ratio of each component described in the bubble-containing hydraulic composition of the present invention can be appropriately applied by replacing the content of each component with the amount of mixture.

[0072] In step 1, the foaming 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.

[0073] 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 weight 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 the strength of the hardened body. In this manufacturing method, admixtures and additives known in the industry can be mixed in step 1 and / or step 2.

[0074] [Gypsum slurry containing air bubbles, and method for producing the same] In the bubble-containing hydraulic composition of the present invention, gypsum is preferred as the hydraulic powder. In the present invention, a bubble-containing hydraulic composition in which the hydraulic powder is gypsum is also called a bubble-containing gypsum slurry. In other words, the present invention provides a bubble-containing gypsum slurry containing gypsum, water, component (A1), optionally component (A2), and component (B), wherein 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. The bubble-containing gypsum slurry of the present invention is suitable for use in gypsum boards.

[0075] The foam-containing gypsum slurry of the present invention can be appropriately adapted to the matters described in the foaming agent composition for hydraulic compositions of the present invention, the foam-containing hydraulic composition of the present invention, and the method for producing the foam-containing hydraulic composition of the present invention. Components (A1), (A2), and (B) are the same as those described in the foaming agent composition for hydraulic compositions of the present invention. In the bubble-containing gypsum slurry of the present invention, the content and mass ratio of each component described in the bubble-containing hydraulic composition of the present invention can be appropriately applied by substituting the hydraulic powder for gypsum. In the bubble-containing gypsum slurry of the present invention, the range of specific gravity and average bubble diameter is the same as that described for the bubble-containing hydraulic composition of the present invention.

[0076] 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 clays, and mixtures thereof. The clay contained in gypsum is mainly composed of hydrated silicate minerals with a layered structure (hereinafter referred to as clay minerals). Examples of clay minerals that are present 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).

[0077] Gypsum can be anhydrous gypsum, hemihydrate gypsum, dihydrate gypsum, etc. 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 as raw material gypsum. Recycled gypsum can be any recycled gypsum recovered from waste gypsum board generated in-house by gypsum board manufacturers, or from waste gypsum board 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.

[0078] The bubble-containing gypsum slurry of the present invention may contain additives used for gypsum boards and the like. Such additives include general-purpose water-reducing agents, defoaming agents, foam stabilizers, hardening modifiers, water-repellent agents, adhesives, and retarders. Furthermore, glass fibers, carbon fibers, recycled paper, virgin pulp, etc. may be added as reinforcing fibers, or gypsum boards may be manufactured together with lightweight aggregates such as perlite and foamed steel.

[0079] The bubble-containing gypsum slurry of the present invention can be manufactured using the bubble-forming agent composition for hydraulic compositions of the present invention. In other words, the present invention provides a method for producing a bubble-containing gypsum slurry, comprising the following steps 1 and 2. <Process 1> A step of foaming a liquid composition containing the foaming agent composition for hydraulic compositions of the present invention and water to obtain foam. <Process 2> A step of mixing the foam obtained in step 1 with a gypsum slurry containing gypsum and water.

[0080] This manufacturing method allows for the preparation of the bubble-containing gypsum slurry of the present invention. The method for producing the foam-containing gypsum slurry of the present invention can appropriately apply the embodiments described in the foaming agent composition for hydraulic compositions, the foam-containing hydraulic composition and its production method, and the foam-containing gypsum slurry of the present invention. In the method for producing 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 hydraulic powder with gypsum and further replacing the content of each component with the amount of mixture. The temperature of the foam and gypsum slurry used for mixing is preferably 15°C to 40°C, respectively. Steps 1 and 2 can be carried out in accordance with the method for producing the bubble-containing hydraulic composition of the present invention. [Examples]

[0081] The components used in the examples and comparative examples are shown below. (A1) component C10AS: Sodium Decyl Sulfate • C8AS: Sodium octyl sulfate ·s-C8AS:2-Ethylhexyl sulfate sodium (A2) Component • C12AS: Sodium lauryl sulfate, (A21) component C13AS: Sodium alkyl sulfate (12 / 14 / 16 carbon atoms = 63.5 / 23.5 / 13.0), component (A21) AES: Sodium polyoxyethylene alkyl ether sulfate, product name "Emal D-3-D", manufactured by Kao Corporation, (A22) ingredient • AG: Alkyl polyglycoside (lauryl glycoside), product name "Mydol 12", manufactured by Kao Corporation, (A23) ingredient (B) Component • C8OH: Octanol, product name "Calcol 0898", manufactured by Kao Corporation. • C6OH: Hexanol, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. • C10OH: Decanol, product name "Calcol 1098", manufactured by Kao Corporation. • s-C8OH: 2-ethylhexanol, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. (Component B') (Comparative component of component (B)) • C12OH: Lauryl alcohol, product name "Calcol 2098", manufactured by Kao Corporation.

[0082] (1) Preparation of foaming agent composition for hydraulic composition The foaming agent compositions for hydraulic compositions shown in Tables 1-3 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 tube, and the mixture was stirred at 1000 rpm for 3 hours using a stirring bar. If the solution viscosity was high and the stirring efficiency was poor, the mixture was heated to 40°C as appropriate.

[0083] (2) Preparation of gypsum slurry The foaming agent compositions for hydraulic compositions prepared in Tables 1-3 were mixed with water in a mass ratio of 1:99 to prepare an aqueous solution with a concentration of 1.0% by mass (100-fold dilution) of the foaming agent composition for hydraulic compositions. 25 g of the prepared aqueous solution was added to a 1 L disposable cup and stirred for 60 seconds at 2000 rpm (EUROSTAR 200 control, IKA Japan Co., Ltd.) using a flat 6-blade paddle (FP-50, manufactured by AS ONE Corporation) to obtain foam. Note that in Table 1, the concentration of the aqueous solution of the foaming agent composition for hydraulic compositions was changed from 1.0% by mass to the concentration shown in Table 1 in order to make the specific gravity of the hardened gypsum slurry obtained approximately 0.5. 200g of calcined gypsum, 2g of dihydrate gypsum, 150g of water, and 0.8g of water-reducing agent (Mighty 150, manufactured by Kao Corporation) were added to a 500mL disposable cup. The mixture was then stirred for 20 seconds at setting 3 using a hand mixer (MK-H4, manufactured by Panasonic Corporation) to prepare the gypsum slurry before foam addition. 25 g of foam prepared in a 1 L disposable cup was mixed with the entirety of the prepared gypsum slurry, and the mixture was kneaded in the 1 L disposable cup at 1500 rpm for 30 seconds using the flat 6-blade paddle to obtain a gypsum slurry containing air bubbles. The water / gypsum ratio of the gypsum slurry was 75% by mass. The temperature of both the foam and the gypsum slurry used for kneading was 20°C.

[0084] (3) Measurement of the average bubble diameter in gypsum The resulting gypsum slurry containing air bubbles was poured into a mold (Plamold, manufactured by Nifco Corporation) for cylindrical specimens with a diameter of 5 cm and a height of 10 cm, and left to stand at room temperature for more than one hour. The hardened gypsum slurry was demolded from the mold for the cylindrical specimen, dried in a 60°C constant temperature bath for 24 hours, and then a cut was made at a height of 5 cm to create a cross-section of the hardened body. The cross-section was observed with a digital microscope, and the diameters of 100 randomly selected air bubble cross-sections were measured. The average air bubble diameter was calculated from the arithmetic mean of these values. For measuring the diameter of the air bubble cross-section, the diameter was measured if the cross-section was circular, the major axis if the cross-section was elliptical, and the longest part if the cross-section was irregular in shape. The results are shown in Tables 1-3. The specific gravity of the hardened gypsum slurry obtained is shown in Table 1. The specific gravity of the hardened gypsum slurry obtained in Tables 2 and 3 ranged from 0.28 to 0.72.

[0085] (4) Measurement of gypsum strength The hardened gypsum slurry obtained in (3) Table 1 was left to stand in a constant temperature bath at 40°C for 2 hours, and then its compressive strength was immediately measured using a strength testing machine (CONCRETO2000X, Shimadzu Corporation) at a compression rate of 1 mm per minute. The results are shown in Table 1.

[0086] [Table 1]

[0087] The results in Table 1 show that, when the specific gravity of the hardened gypsum slurry is approximately the same, the strength of the hardened gypsum slurry can be increased by increasing the average bubble diameter within the hardened gypsum slurry.

[0088] [Table 2]

[0089] [Table 3]

Claims

1. A foaming agent composition for a hydraulic composition, comprising the following component (A1), optionally the following component (A2), and the following component (B), wherein the mass ratio (A1) / [(A1)+(A2)] of the content of the component (A1) to the total content of the components (A1) and (A2) is 0.8 or more and 1 or less. Component (A1): one or more selected from alkyl or alkenyl sulfate esters having an alkyl or alkenyl group having from 8 to 10 carbon atoms, and salts thereof Component (A2): one or more surfactants selected from the group consisting of surfactants other than component (A1) Component (B): a monohydric alcohol having 6 to 10 carbon atoms

2. The foaming agent composition for hydraulic compositions according to claim 1, comprising 15% by mass or more and 80% by mass or less of the component (A1).

3. 3. The foaming agent composition for hydraulic compositions according to claim 1, wherein the mass ratio (A1) / [(A1)+(A2)] of the content of the (A1) component to the total content of the (A1) component and the (A2) component is 0.9 or more and 1 or less.

4. 3. The foaming agent composition for hydraulic compositions according to claim 1, wherein the mass ratio (B) / (A1) of the content of the component (B) to the content of the component (A1) is 0.01 or more and 0.3 or less.

5. 3. The foaming agent composition for hydraulic compositions according to claim 1, wherein the mass ratio (B) / [(A1)+(A2)] of the content of the (B) component to the total content of the (A1) component and the (A2) component is 0.005 or more and 0.3 or less.

6. 3. The foaming agent composition for hydraulic compositions according to claim 1 or 2, wherein the component (A2) is one or more selected from alkyl or alkenyl sulfate esters other than the component (A1) and salts thereof (hereinafter referred to as the component (A21)), one or more selected from polyoxyalkylene alkyl or alkenyl ether sulfate esters having an alkyl group or alkenyl group having from 8 to 16 carbon atoms and salts thereof (hereinafter referred to as the component (A22)), and one or more selected from glycoside-type nonionic surfactants (hereinafter referred to as the component (A23)).

7. 7. The foaming agent composition for hydraulic compositions according to claim 6, wherein the mass ratio (A1) / [(A1)+(A21)] of the content of the (A1) component to the total content of the (A1) component and the (A21) component is 0.8 or more and 1 or less.

8. 7. The foaming agent composition for hydraulic compositions according to claim 6, wherein the mass ratio (B) / [(A1)+(A21)] of the content of the (B) component to the total content of the (A1) component and the (A21) component is 0.005 or more and 0.3 or less.

9. 7. The foaming agent composition for hydraulic compositions according to claim 6, wherein the mass ratio (A1) / [(A1)+(A22)] of the content of the (A1) component to the total content of the (A1) component and the (A22) component is 0.8 or more and 1 or less.

10. 7. The foaming agent composition for hydraulic compositions according to claim 6, wherein the mass ratio (B) / [(A1)+(A22)] of the content of the (B) component to the total content of the (A1) component and the (A22) component is 0.005 or more and 0.3 or less.

11. The foaming agent composition for hydraulic compositions according to claim 6, wherein the content of the component (A22) is 6 mass% or less.

12. The foaming agent composition for hydraulic compositions according to claim 1 or 2, which is for use in gypsum slurries.

13. A bubble-containing hydraulic composition comprising a hydraulic powder, water, the following component (A1), optionally the following component (A2), and the following component (B), wherein the mass ratio (A1) / [(A1)+(A2)] of the content of the component (A1) to the total content of the components (A1) and (A2) is 0.8 or more and 1 or less. Component (A1): one or more selected from alkyl or alkenyl sulfate esters having an alkyl or alkenyl group having from 8 to 10 carbon atoms, and salts thereof Component (A2): one or more surfactants selected from the group consisting of surfactants other than component (A1) Component (B): a monohydric alcohol having 6 to 10 carbon atoms

14. 14. The bubble-containing hydraulic composition according to claim 13, wherein the hydraulic powder is gypsum.

15. The bubble-containing hydraulic composition according to claim 13 or 14, wherein the average bubble diameter of the set product of the bubble-containing hydraulic composition is 200 μm or more and 800 μm or less.

16. A method for producing a bubble-containing hydraulic composition, comprising the following steps 1 and 2: <Step 1> A process for foaming a liquid composition containing the foaming agent composition for hydraulic compositions according to claim 1 or 2 and water to obtain a foam. <Step 2> A step of mixing the foam obtained in step 1 with a hydraulic composition containing hydraulic powder and water.

17. The method for producing a bubble-containing hydraulic composition according to claim 16, wherein the hydraulic powder is gypsum.