Foamer composition for hydraulic composition

Abstract

To provide a foamer composition for hydraulic compositions, enabling an increase in the bubble diameter of a bubble-containing hydraulic composition, to provide a bubble-containing hydraulic composition and to provide a method for producing the same.SOLUTION: A foamer composition for hydraulic compositions contains (A) a compound represented by the general formula (a1) (hereinafter referred to as component (A)). R1aO-(PO)n-SO3-M (a1) [where R1a denotes a C8-18 alkyl group or alkenyl group, PO denotes a propyleneoxy group, n denotes an average number of added moles, being a number greater than 0 and 2 or smaller, and M denotes an alkali metal ion, an ammonium ion or an alkanol ammonium ion].SELECTED DRAWING: None

Description

[Technical field]

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

[0002] Air bubbles are introduced into hydraulic compositions using cement or gypsum as a hardening agent to reduce their weight. Usually, a foamed liquid composition containing a foaming agent composition and water is foamed, and the foam is mixed with the hydraulic composition, or with fine aggregate or various admixtures to produce a lightweight air bubble-containing hydraulic composition.

[0003] Patent Document 1 discloses a foaming agent for hydraulic compositions that contains a specific sulfate ester salt having an oxyalkylene group with 2 to 4 carbon atoms and a specific polyether compound having an oxyalkylene group with 2 to 4 carbon atoms, thereby improving the fluidity of the hydraulic composition containing bubbles and the strength of the hardened body of the hydraulic composition without increasing the density of the hardened body, and also has excellent bubble stability. In the examples, a foaming agent for hydraulic compositions is disclosed that contains a specific sulfate ester salt having an oxyalkylene group with 2 carbon atoms and a specific polyether compound having an oxyalkylene group with 2 carbon atoms. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2005-154241 A Summary of the Invention [Problem to be solved by the invention]

[0005] There is a demand for further weight reduction in hardened foams of air-filled hydraulic compositions using cement or gypsum as a hardening agent, from the viewpoints of reducing the environmental impact (CO2) caused by production, transportation, and raw material procurement, as well as costs. The bubble-containing hydraulic composition can reduce the specific gravity of the hardened body of the hydraulic composition by containing bubbles, and can reduce the weight. However, if the volume (ratio) of the bubbles is increased in order to further reduce the weight of the hardened body of the hydraulic composition, the ratio of the hydraulic composition decreases, and the strength of the hardened body tends to decrease. On the other hand, as described in paragraph 0004 of JP-A-10-330174, for bubble-containing hydraulic compositions of the same specific gravity, the strength of the hardened body of the bubble-containing hydraulic composition can be increased by increasing the bubble diameter. In addition, when the bubble diameter in the bubble-containing hydraulic composition is increased, the drying time when obtaining the hardened body of the bubble-containing hydraulic composition is accelerated, and there are merits such as reduction in fuel costs for drying and reduction in CO2 emissions. In addition, when the bubble diameter in the bubble-containing hydraulic composition is increased, the distance between the bubbles increases, and the bubbles are less likely to communicate with each other, and the heat insulation and sound insulation can be improved. Therefore, there is a demand for a technique for increasing the bubble diameter in a bubble-containing hydraulic composition.

[0006] The present invention provides a foaming agent composition for a hydraulic composition, which can increase the bubble diameter in the bubble-containing hydraulic composition, a bubble-containing hydraulic composition, and a method for producing the same. [Means for solving the problem]

[0007] The present invention relates to a foaming agent composition for hydraulic compositions, which contains (A) a compound represented by the following general formula (a1) (hereinafter referred to as component (A)). R 1a O-(PO) n -SO3-M (a1) [In the formula, R 1a represents an alkyl or alkenyl group having 8 to 18 carbon atoms, PO represents a propyleneoxy group, n is the average number of moles added and is a number greater than 0 and not greater than 2, and M represents an alkali metal ion, an ammonium ion, or an alkanolammonium ion.

[0008] The present invention also relates to a bubble-containing hydraulic composition comprising hydraulic powder, water, and component (A).

[0009] 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 a foam. <Process 2> A step of mixing hydraulic powder, water, and the foam obtained in step 1. Effect of the Invention

[0010] According to the present invention, there are provided a foaming agent composition for hydraulic compositions, a bubble-containing hydraulic composition, and a method for producing the same, which can increase the bubble diameter in the bubble-containing hydraulic composition. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The reason why the foaming agent composition for hydraulic compositions of the present invention can increase the bubble diameter in the bubble-containing hydraulic composition is not necessarily clear, but is presumed to be as follows. Conventional foaming agent compositions for hydraulic compositions form a dense packing structure when adsorbed to the gas-liquid interface, lose the fluidity of the bubble film, and the bubbles are unlikely to coalesce when the bubbles come into contact with each other, so the bubble diameter in the bubble-containing hydraulic composition could not be increased. In contrast, the foaming agent composition for hydraulic compositions of the present invention forms a loose packing structure when component (A) is adsorbed to the gas-liquid interface, and the bubble film has high fluidity, so that the bubbles are likely to coalesce when the bubbles come into contact with each other, and it is believed that the bubble diameter in the bubble-containing hydraulic composition is likely to grow large.

[0012] [Foaming agent composition for hydraulic composition] <Component (A)> The foaming agent composition for hydraulic compositions of the present invention contains, as component (A), a compound represented by the following general formula (a1) (hereinafter referred to as component (A)). R 1a O-(PO) n -SO3-M (a1) [In the formula, R 1arepresents an alkyl or alkenyl group having 8 to 18 carbon atoms, PO represents a propyleneoxy group, n is the average number of moles added and is a number greater than 0 and not greater than 2, and M represents an alkali metal ion, an ammonium ion, or an alkanolammonium ion.

[0013] In general formula (a1), R 1a is an alkyl or alkenyl group, preferably an alkyl group, having 8 or more, preferably 10 or more, and 18 or less, preferably 16 or less, more preferably 14 or less, even more preferably 12 or less, and still more preferably 12, from the viewpoint of increasing the bubble diameter of the hydraulic composition and decreasing the specific gravity of the hydraulic composition. In the general formula (a1), from the viewpoint of increasing the bubble diameter of the hydraulic composition and decreasing the specific gravity of the hydraulic composition, R 1a In the mass distribution of the carbon numbers of the alkyl or alkenyl groups having 8 to 18 carbon atoms, the proportion of the group having 12 carbon atoms is preferably 70 mass% or more, more preferably 85 mass% or more. Furthermore, in the general formula (a1), from the viewpoints of increasing the bubble diameter of the hydraulic composition and decreasing the specific gravity of the hydraulic composition, 1a In the mass distribution of the carbon numbers of the alkyl or alkenyl groups having from 8 to 12 carbon atoms, the proportion of those having 12 carbon atoms is preferably 70 mass % or more, and more preferably 85 mass % or more. In the general formula (a1), n ​​is the average number of moles of PO added, and is a number exceeding 0, preferably 1 or more and 2 or less, from the viewpoint of increasing the bubble diameter of the hydraulic composition.

[0014] <Composition, etc.> The foaming agent composition for hydraulic compositions of the present invention contains the component (A) in an amount of preferably 2% by mass or more, more preferably 5% by mass or more, even more preferably 10% by mass or more, and preferably 40% by mass or less, more preferably 30% by mass or less, even more preferably 20% by mass or less, in terms of increasing the bubble diameter of the hydraulic composition and decreasing the specific gravity of the hydraulic composition. In the present invention, the mass of component (A) is specified based on the value converted into the sodium salt.

[0015] From the viewpoints of low-temperature storage stability and enlarging the bubbles in the hydraulic composition, the foaming agent composition for hydraulic compositions of the present invention preferably contains an alkyl or alkenyl sulfate ester or a salt thereof as component (B). From the viewpoints of low-temperature storage stability and enlarging the bubble diameter of the hydraulic composition, component (B) has an alkyl or alkenyl group, preferably an alkyl group, having 8 or more and 18 or less, preferably 16 or less, more preferably 14 or less, even more preferably 12 or less, and still more preferably 10 carbon atoms. The salt of component (B) may be one or more selected from alkali metal salts such as sodium salts and potassium salts, ammonium salts, and organic ammonium salts.

[0016] Specific examples of the (B) component include one or more selected from octyl sulfate, decyl sulfate, 2-ethylhexyl sulfate, 2-propylheptyl sulfate, lauryl sulfate, tridecyl sulfate, myristyl sulfate, cetyl sulfate, stearyl sulfate, oleyl sulfate, and salts thereof. From the viewpoints of low-temperature storage stability and enlarging the bubble diameter of the hydraulic composition, one or more selected from octyl sulfate, decyl sulfate, 2-ethylhexyl sulfate, 2-propylheptyl sulfate, lauryl sulfate, and salts thereof are preferred, and decyl sulfate or a salt thereof is more preferred.

[0017] The foaming agent composition for hydraulic compositions of the present invention contains the component (B) in an amount of preferably 10% by mass or more, more preferably 15% by mass or more, even more preferably 19% by mass or more, and preferably 40% by mass or less, more preferably 30% by mass or less, even more preferably 25% by mass or less, in terms of low-temperature storage stability and enlarging the bubbles in the hydraulic composition. In the present invention, the mass of the component (B) is specified based on the value converted into the sodium salt.

[0018] In the foaming agent composition for hydraulic compositions of the present invention, the mass ratio (A) / (B) of the content of the (A) component to the content of the (B) component is, from the viewpoints of low-temperature storage stability and enlarging the bubble diameter of the hydraulic composition, preferably 5 / 95 or more, more preferably 10 / 90 or more, even more preferably 20 / 80 or more, even more preferably 30 / 70 or more, still more preferably 40 / 60 or more, and preferably 90 / 10 or less, more preferably 80 / 20 or less, even more preferably 70 / 30 or less, still more preferably 60 / 40 or less, still more preferably 55 / 45 or less, and still more preferably 50 / 50 or less.

[0019] The foaming agent composition for hydraulic compositions of the present invention may contain a polyoxyethylene alkyl or alkenyl ether sulfate or a salt thereof, but the content is limited from the viewpoint of obtaining the effects of the present invention. Examples of the polyoxyethylene alkyl or alkenyl ether sulfate or a salt thereof include one or more selected from 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, and salts thereof.

[0020] In the foaming agent composition for hydraulic compositions of the present invention, the content of polyoxyethylene alkyl or alkenyl ether sulfate or its salt is preferably 10% by mass or less, more preferably 5% by mass or less, even more preferably 3% by mass or less, even more preferably 1% by mass or less, and even more preferably 0.5% by mass or less, from the viewpoint of increasing the bubble size of the hydraulic composition. In the present invention, the mass of polyoxyethylene alkyl or alkenyl ether sulfate or its salt is a value converted to a sodium salt. In the viewpoint of increasing the bubble size of the hydraulic composition, it is preferable that the foaming agent composition for hydraulic compositions of the present invention does not contain polyoxyethylene alkyl or alkenyl ether sulfate or its salt.

[0021] From the viewpoints of foaming speed and foam stability, the foaming agent composition for hydraulic compositions of the present invention preferably contains a monohydric alcohol having 6 to 10 carbon atoms as component (C). The carbon number of the (C) component is 6 or more and 10 or less, and preferably 8, from the viewpoints of rapid foaming and foam stability. From the viewpoints of rapid foaming and foam stability, component (C) is a monohydric alcohol having a straight-chain or branched-chain hydrocarbon group, preferably a straight-chain or branched-chain alkyl group, and more preferably a straight-chain alkyl group.

[0022] Specific examples of the (C) component include one or more selected from hexanol, octanol, decanol, 2-ethylhexanol, and 2-propylheptanol. From the viewpoint of foamability, it is preferable to contain one or more selected from octanol and decanol, more preferably octanol. The content of one or more selected from octanol and decanol in the (C) component 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. The content of octanol in the (C) component 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.

[0023] When the foaming agent composition for hydraulic compositions of the present invention contains the component (C), the component (C) is contained in the composition in an amount of preferably 0.5% by mass or more, more preferably 1% by mass or more, even more preferably 3% by mass or more, and preferably 10% by mass or less, more preferably 8% by mass or less, even more preferably 6% by mass or less, from the viewpoints of lowering the specific gravity of the hydraulic composition and increasing the bubble diameter.

[0024] When the foaming agent composition for hydraulic compositions of the present invention contains the (C) component, the mass ratio (C) / [(A)+(B)] of the content of the (C) component to the total content of the (A) component and the (B) component is, from the viewpoint of reducing the specific gravity of the hydraulic composition and increasing the bubble size, preferably 0.03 or more, more preferably 0.06 or more, even more preferably 0.10 or more, and is preferably 0.30 or less, more preferably 0.20 or less, even more preferably 0.15 or less.

[0025] The foaming agent composition for hydraulic compositions of the present invention preferably contains a nonionic surfactant as component (D) from the viewpoint of lowering the specific gravity of the hydraulic composition and increasing the bubble size. The nonionic surfactant may be one or more selected from alkyl monoglyceryl ether, polyoxyalkylene monoalkyl or alkenyl ether, alkyl glycoside or alkyl polyglycoside (glycoside type nonionic surfactant), sorbitan type nonionic surfactant, aliphatic alkanolamide, fatty acid monoglyceride, and sucrose fatty acid ester. Among these, it is preferable to contain a glycoside type nonionic surfactant from the viewpoint of increasing the diameter of bubbles in the hydraulic composition.

[0026] The glycoside nonionic surfactant is more preferably a compound represented by the following general formula (d1). R 1d -(OR 2d ) x G y (d1) [In the formula, R 1d R is a linear alkyl group having 8 or more carbon atoms, preferably 10 or more carbon atoms, and 16 or less carbon atoms, preferably 14 or less carbon atoms. 2d 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 having an average value of 0 to 6. y is a number having an average value of 1 to 10, preferably 5 or less, more preferably 2 or less.

[0027] In the compound of general formula (d1), G is a residue derived from a reducing sugar. The reducing sugar of the raw material of G may be either an aldose or a ketose. In addition, the reducing sugar of the raw material of G may be a triose having a carbon number of 3, a tetrose having a carbon number of 4, a pentose having a carbon number of 5, or a hexose having a carbon number of 6. Specific examples of the aldose include apiose, arabinose, galactose, glucose, lyxose, mannose, galose, aldose, idose, talose, and xylose. In addition, specific examples of the ketose include fructose. The reducing sugar of the raw material of G of the present invention is preferably an aldopentose, which is an aldose having a carbon number of 5, or an aldohexose, which is an aldose having a carbon number of 6, and more preferably glucose.

[0028] When the foaming agent composition for hydraulic compositions of the present invention contains the component (D), the component (D) is contained in the composition in an amount of preferably 0.5% by mass or more, more preferably 1% by mass or more, even more preferably 1.5% by mass or more, and preferably 6% by mass or less, more preferably 5% by mass or less, even more preferably 3% by mass or less, from the viewpoint of lowering the specific gravity of the hydraulic composition and increasing the bubble diameter.

[0029] When the foaming agent composition for hydraulic compositions of the present invention contains the (D) component, the mass ratio (D) / [(A)+(B)] of the content of the (D) component to the total content of the (A) component and the (B) component is, from the viewpoint of reducing the specific gravity of the hydraulic composition and increasing the bubble size, preferably 0.01 or more, more preferably 0.03 or more, even more preferably 0.05 or more, and is preferably 0.20 or less, more preferably 0.15 or less, even more preferably 0.10 or less.

[0030] 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 contains water in an amount of preferably 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, even more preferably 70% by mass or less.

[0031] The foaming agent composition for hydraulic compositions of the present invention may optionally contain a thickener, a chelating agent, a heavy metal scavenger, a rust inhibitor, a preservative, a colorant, a fragrance, a defoamer, a solvent, a dispersant, a flocculant, a water-soluble polymer, etc. However, these do not fall under the category of components (A), (B), (C), and (D).

[0032] The foaming agent composition for hydraulic compositions of the present invention can be obtained by mixing the component (A) and any optional components. During mixing, heating may be performed appropriately to reduce the solution viscosity.

[0033] The foaming agent composition for hydraulic compositions of the present invention is intended for use in the following applications: hydraulic compositions containing air bubbles, such as gypsum slurry, lightweight milk (aerated milk, air milk), lightweight mortar (aerated mortar, air mortar), lightweight concrete (aerated concrete, air concrete), backfilling material, innerfilling material, architectural concrete block, ALC (lightweight aerated concrete), grout material, ceramic porous body, brick, refractory material, lightweight embankment, and pump pressure mortar. In these hydraulic compositions containing air bubbles, the addition of air bubbles is expected to provide functions such as weight reduction, strength improvement, fluidity improvement, heat insulation, heat resistance, viscosity, and fluidity control. Among these foam-containing hydraulic compositions, the foaming agent composition for hydraulic compositions of the present invention is suitable for use in gypsum slurries.

[0034] The foaming agent composition for hydraulic compositions of the present invention is preferably liquid at 10°C, more preferably 5°C, and even more preferably 0°C, from the viewpoint of storage stability at low temperatures such as winter.

[0035] [Air-containing hydraulic composition and its manufacturing method] The method for producing a hydraulic composition containing bubbles is preferably a method in which the foaming agent composition for hydraulic compositions of the present invention is foamed and mixed with a hydraulic substance as foam to make the composition lighter, since it entrains uniform bubbles. The foaming agent composition for hydraulic compositions of the present invention or a mixed liquid obtained by diluting it with water may be directly kneaded into paste, slurry, mortar, or concrete containing cement or gypsum as a hydraulic substance. There is no limitation on the method for adding the foaming agent composition for hydraulic compositions of the present invention to a hydraulic composition, and there is no limitation on the method for foaming the foaming agent composition for hydraulic compositions of the present invention or a mixed liquid obtained by diluting it with water.

[0036] The present invention provides a bubble-containing hydraulic composition comprising hydraulic powder, water, and component (A).

[0037] The bubble-containing hydraulic composition of the present invention contains, as component (A), a compound represented by the following general formula (a1) (hereinafter referred to as component (A)). R 1a O-(PO) n -SO3-M (a1) [In the formula, R 1a represents an alkyl or alkenyl group having 8 to 18 carbon atoms, PO represents a propyleneoxy group, n is the average number of moles added and is a number greater than 0 and not greater than 2, and M represents an alkali metal ion, an ammonium ion, or an alkanolammonium ion.

[0038] In general formula (a1), R 1a is an alkyl or alkenyl group, preferably an alkyl group, having 8 or more, preferably 10 or more, and 18 or less, preferably 16 or less, more preferably 14 or less, even more preferably 12 or less, and still more preferably 12, from the viewpoint of increasing the bubble diameter of the hydraulic composition and decreasing the specific gravity of the hydraulic composition. In the general formula (a1), from the viewpoint of increasing the bubble diameter of the hydraulic composition and decreasing the specific gravity of the hydraulic composition, R 1aIn the mass distribution of the carbon numbers of the alkyl or alkenyl groups having 8 to 18 carbon atoms, the proportion of the group having 12 carbon atoms is preferably 70 mass% or more, more preferably 85 mass% or more. Furthermore, in the general formula (a1), from the viewpoints of increasing the bubble diameter of the hydraulic composition and decreasing the specific gravity of the hydraulic composition, 1a In the mass distribution of the carbon numbers of the alkyl or alkenyl groups having from 8 to 12 carbon atoms, the proportion of those having 12 carbon atoms is preferably 70 mass % or more, and more preferably 85 mass % or more. In the general formula (a1), n ​​is the average number of moles of PO added, and is a number exceeding 0, preferably 1 or more and 2 or less, from the viewpoint of increasing the bubble diameter of the hydraulic composition.

[0039] The bubble-containing hydraulic composition of the present invention preferably further contains component (B), which is an alkyl or alkenyl sulfate ester or a salt thereof. From the viewpoint of increasing the diameter of bubbles in the hydraulic composition, the (B) component has an alkyl or alkenyl group, preferably an alkyl group, having 8 or more and 18 or less, preferably 16 or less, more preferably 14 or less, even more preferably 12 or less, and still more preferably 10 carbon atoms. The salt of component (B) may be one or more selected from alkali metal salts such as sodium salts and potassium salts, ammonium salts, and organic ammonium salts.

[0040] Specific examples of the (B) component include one or more selected from octyl sulfate, decyl sulfate, 2-ethylhexyl sulfate, 2-propylheptyl sulfate, lauryl sulfate, tridecyl sulfate, myristyl sulfate, cetyl sulfate, stearyl sulfate, oleyl sulfate, and salts thereof. From the viewpoint of increasing the diameter of bubbles in the hydraulic composition, one or more selected from octyl sulfate, decyl sulfate, 2-ethylhexyl sulfate, 2-propylheptyl sulfate, lauryl sulfate, and salts thereof are preferred, and decyl sulfate or a salt thereof is more preferred.

[0041] The bubble-containing hydraulic composition of the present invention preferably further contains component (C), which is a monohydric alcohol having 6 to 10 carbon atoms. The carbon number of the (C) component is 6 or more and 10 or less, and preferably 8, from the viewpoints of rapid foaming and foam stability. From the viewpoints of rapid foaming and foam stability, component (C) is a monohydric alcohol having a straight-chain or branched-chain hydrocarbon group, preferably a straight-chain or branched-chain alkyl group, and more preferably a straight-chain alkyl group.

[0042] Specific examples of the (C) component include one or more selected from hexanol, octanol, decanol, 2-ethylhexanol, and 2-propylheptanol. From the viewpoint of foamability, it is preferable to contain one or more selected from octanol and decanol, more preferably octanol. The content of one or more selected from octanol and decanol in the (C) component 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. The content of octanol in the (C) component 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.

[0043] The bubble-containing hydraulic composition of the present invention preferably further contains component (D), which is a nonionic surfactant. The nonionic surfactant may be one or more selected from alkyl monoglyceryl ether, polyoxyalkylene monoalkyl or alkenyl ether, alkyl glycoside or alkyl polyglycoside (glycoside type nonionic surfactant), sorbitan type nonionic surfactant, aliphatic alkanolamide, fatty acid monoglyceride, and sucrose fatty acid ester. Among these, it is preferable to contain a glycoside type nonionic surfactant from the viewpoint of increasing the diameter of bubbles in the hydraulic composition.

[0044] The glycoside nonionic surfactant is more preferably a compound represented by the following general formula (d1). R 1d -(OR 2d ) x G y (d1) [In the formula, R 1d R is a linear alkyl group having 8 or more carbon atoms, preferably 10 or more carbon atoms, and 16 or less carbon atoms, preferably 14 or less carbon atoms. 2d 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 having an average value of 0 to 6. y is a number having an average value of 1 to 10, preferably 5 or less, more preferably 2 or less.

[0045] In the compound of general formula (d1), G is a residue derived from a reducing sugar. The reducing sugar of the raw material of G may be either an aldose or a ketose. In addition, the reducing sugar of the raw material of G may be a triose having a carbon number of 3, a tetrose having a carbon number of 4, a pentose having a carbon number of 5, or a hexose having a carbon number of 6. Specific examples of the aldose include apiose, arabinose, galactose, glucose, lyxose, mannose, galose, aldose, idose, talose, and xylose. In addition, specific examples of the ketose include fructose. The reducing sugar of the raw material of G of the present invention is preferably an aldopentose, which is an aldose having a carbon number of 5, or an aldohexose, which is an aldose having a carbon number of 6, and more preferably glucose.

[0046] The foaming agent composition for hydraulic compositions of the present invention can be appropriately applied to the foaming agent composition for hydraulic compositions of the present invention. The components (A), (B), (C), and (D) are the same as those described in the foaming agent composition for hydraulic compositions of the present invention.

[0047] The hydraulic powder is a powder having the physical property of hardening through a hydration reaction, and examples of the powder include cement and gypsum, with gypsum being preferred. Examples of cement include ordinary Portland cement, belite cement, moderate heat cement, high-early-strength cement, ultra-high-early-strength cement, and sulfate-resistant cement. These may also be supplemented with blast furnace slag cement, fly ash cement, or silica fume cement to produce these with the addition of blast furnace slag, fly ash, silica fume, or stone powder (calcium carbonate powder).

[0048] The bubble-containing hydraulic composition of the present invention has a water / hydraulic powder ratio of preferably 20% by mass or more, more preferably 30% by mass or more, and even more preferably 40% 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 body strength. Here, the water / hydraulic powder ratio is the mass percentage (mass%) of water and hydraulic powder in the hydraulic composition, and is calculated by water / hydraulic powder x 100. The water / hydraulic powder ratio is calculated based on the amount of powder having the physical property of being hardened by hydration reaction. When the powder having the physical property of being hardened by 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 regarding the hydraulic powder.

[0049] The bubble-containing hydraulic composition of the present invention contains, from the viewpoint of increasing the bubble size and decreasing the specific gravity of the hydraulic composition, preferably 0.0001 part by mass or more of component (A) per 100 parts by mass of hydraulic powder, preferably 0.0005 part by mass or more, more preferably 0.001 part by mass or more, and preferably 0.02 part by mass or less, more preferably 0.01 part by mass or less, even more preferably 0.008 part by mass or less, and even more preferably 0.004 part by mass or less.

[0050] When the bubble-containing hydraulic composition of the present invention contains component (B), the bubble-containing hydraulic composition contains component (B) in an amount of preferably 0.0001 part by mass or more, more preferably 0.0005 part by mass or more, even more preferably 0.001 part by mass or more, still more preferably 0.005 part by mass or more, and preferably 0.01 part by mass or less, more preferably 0.009 part by mass or less, and even more preferably 0.008 part by mass or less, per 100 parts by mass of hydraulic powder, from the viewpoint of increasing the bubble diameter of the hydraulic composition.

[0051] When the bubble-containing hydraulic composition of the present invention contains the component (B), the mass ratio (A) / (B) of the content of the component (A) to the content of the component (B) is, from the viewpoint of increasing the diameter of the bubbles in the hydraulic composition, preferably 5 / 95 or more, more preferably 10 / 90 or more, even more preferably 20 / 80 or more, even more preferably 30 / 70 or more, still more preferably 40 / 60 or more, and preferably 90 / 10 or less, more preferably 80 / 20 or less, even more preferably 70 / 30 or less, still more preferably 60 / 40 or less, still more preferably 55 / 45 or less, and still more preferably 50 / 50 or less.

[0052] The bubble-containing hydraulic composition of the present invention may contain a polyoxyethylene alkyl or alkenyl ether sulfate or a salt thereof, but the content is limited from the viewpoint of obtaining the effects of the present invention. In the bubble-containing hydraulic composition of the present invention, the content of the polyoxyethylene alkyl or alkenyl ether sulfate or its salt is preferably 0.001 part by mass or less, more preferably 0.0008 parts by mass or less, even more preferably 0.0006 parts by mass or less, still more preferably 0.0003 parts by mass or less, still more preferably 0.0001 parts by mass or less, and even more preferably 0.00001 parts by mass or less, per 100 parts by mass of hydraulic powder, from the viewpoint of increasing the bubble diameter of the hydraulic composition. From the viewpoint of increasing the diameter of bubbles in the bubble-containing hydraulic composition of the present invention, it is preferable that the bubble-containing hydraulic composition does not contain polyoxyethylene alkyl or alkenyl ether sulfate or a salt thereof.

[0053] When the bubble-containing hydraulic composition of the present invention contains component (C), the component (C) is preferably contained in an amount of 0.00005 parts by mass or more, more preferably 0.0001 parts by mass or more, even more preferably 0.0002 parts by mass or more, and preferably 0.004 parts by mass or less, more preferably 0.0015 parts by mass or less, and even more preferably 0.0008 parts by mass or less, per 100 parts by mass of hydraulic powder, from the viewpoint of lowering the specific gravity of the hydraulic composition and increasing the diameter of the bubbles.

[0054] When the bubble-containing hydraulic composition of the present invention contains the (C) component, the mass ratio (C) / [(A)+(B)] of the content of the (C) component to the total content of the (A) and (B) components is, from the viewpoint of reducing the specific gravity of the hydraulic composition and increasing the bubble size, preferably 0.03 or more, more preferably 0.06 or more, even more preferably 0.10 or more, and is preferably 0.30 or less, more preferably 0.20 or less, even more preferably 0.15 or less.

[0055] When the bubble-containing hydraulic composition of the present invention contains component (D), the component (D) is preferably contained in an amount of 0.00001 part by mass or more, more preferably 0.00005 part by mass or more, even more preferably 0.0001 part by mass or more, and preferably 0.002 part by mass or less, more preferably 0.001 part by mass or less, even more preferably 0.0005 part by mass or less, per 100 parts by mass of hydraulic powder, from the viewpoint of lowering the specific gravity of the hydraulic composition and increasing the diameter of the bubbles.

[0056] When the bubble-containing hydraulic composition of the present invention contains the (D) component, the mass ratio (D) / [(A)+(B)] of the content of the (D) component to the total content of the (A) and (B) components is, from the viewpoint of reducing the specific gravity of the hydraulic composition and increasing the bubble size, preferably 0.01 or more, more preferably 0.03 or more, even more preferably 0.05 or more, and is preferably 0.20 or less, more preferably 0.15 or less, even more preferably 0.10 or less.

[0057] The bubble-containing hydraulic composition of the present invention may contain fine aggregate and / or coarse aggregate, and may contain admixtures or additives known in the art.

[0058] The bubble-containing hydraulic composition of the present invention can be dried and cured to give a hardened product. The specific gravity of the hardened body of the bubble-containing hydraulic composition of the present invention is, from the viewpoint of strength, preferably 0.3 or more, more preferably 0.4 or more, even more preferably 0.5 or more, and from the viewpoint of handleability, preferably 1.0 or less, more preferably 0.9 or less, even more preferably 0.8 or less, and even more preferably 0.7 or less.

[0059] The bubble-containing hydraulic composition of the present invention contains bubbles. The average bubble diameter of the hardened product of the bubble-containing hydraulic composition of the present invention is preferably 200 μm or more, more preferably 230 μm or more, and even more preferably 250 μm or more from the viewpoint of improving the strength of the hardened product, and is preferably 800 μm or less, more preferably 650 μm or less, even more preferably 500 μm or less, and even more preferably 400 μm or less from the viewpoint of cross-sectional appearance. The average bubble diameter is calculated by preparing a hardened product of a bubble-containing hydraulic composition, arbitrarily cutting the hardened product to prepare a cross section, observing the cross section with a digital microscope, measuring the diameter of 100 randomly selected bubble cross sections, and averaging these values ​​(arithmetic mean). The diameter of the bubble cross section is measured when the bubble cross section is circular, the major axis when the bubble cross section is elliptical, and the longest part when the bubble cross section is irregular.

[0060] The bubble-containing hydraulic composition of the present invention can be produced by using the foaming agent composition for hydraulic compositions of the present invention. That is, 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 a foam. <Process 2> A step of mixing hydraulic powder, water, and the foam obtained in step 1. In step 2, a hydraulic composition containing hydraulic powder and water may be prepared, and the hydraulic composition and the foam obtained in step 1 may be mixed.

[0061] The bubble-containing hydraulic composition of the present invention can be prepared by this manufacturing method. The method for producing the bubble-containing hydraulic composition of the present invention can appropriately employ the embodiments described for the foaming agent composition for hydraulic compositions of the present invention and the bubble-containing hydraulic composition of the present invention. In the manufacturing method of the bubble-containing hydraulic composition of the present invention, the contents of the components and their mass ratios described in the bubble-containing hydraulic composition of the present invention can be appropriately applied by replacing the contents of the components with the mixed amounts.

[0062] In step 1, the expansion ratio of the liquid composition varies depending on the application of the hydraulic composition, but from the viewpoint of economy, it is preferably 5 times or more, more preferably 7 times or more, and even more preferably 10 times or more, and 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.

[0063] In step 2, depending on the use of the hydraulic composition, from the viewpoint of reducing the weight of the set body, the foam is mixed with the hydraulic composition in an amount of preferably 50% by volume or more, more preferably 100% by volume or more, and even more preferably 150% by volume or more, and from the viewpoint of the strength of the set body, preferably 400% by volume or less, more preferably 300% by volume or less, and even more preferably 200% by volume or less. In this production method, admixtures or admixtures known in the art can be mixed in step 1 and / or step 2.

[0064] [Gas-containing gypsum slurry and its manufacturing method] In the bubble-containing hydraulic composition of the present invention, the hydraulic powder is preferably gypsum. In the present invention, the bubble-containing hydraulic composition in which the hydraulic powder is gypsum is also called a bubble-containing gypsum slurry. That is, the present invention provides a bubble-containing gypsum slurry containing gypsum, water, and component (A). The bubble-containing gypsum slurry of the present invention contains, as component (A), a compound represented by the following general formula (a1) (hereinafter referred to as component (A)). R 1a O-(PO)n -SO3-M (a1) [In the formula, R 1a represents an alkyl or alkenyl group having 8 to 18 carbon atoms, PO represents a propyleneoxy group, n is the average number of moles added and is a number greater than 0 and not greater than 2, and M represents an alkali metal ion, an ammonium ion, or an alkanolammonium ion.

[0065] In general formula (a1), R 1a is an alkyl or alkenyl group, preferably an alkyl group, having 8 or more, preferably 10 or more, and 18 or less, preferably 16 or less, more preferably 14 or less, even more preferably 12 or less, and still more preferably 12, from the viewpoints of increasing the air bubble diameter and decreasing the specific gravity of the air bubble-containing gypsum slurry hardened body. In the general formula (a1), from the viewpoint of increasing the bubble diameter of the air bubble-containing gypsum slurry hardened body and decreasing the specific gravity of the air bubble-containing gypsum slurry hardened body, R 1a In the mass distribution of the carbon numbers of the alkyl or alkenyl groups having 8 to 18 carbon atoms, the proportion of the group having 12 carbon atoms is preferably 70 mass% or more, and more preferably 85 mass% or more. Furthermore, in the general formula (a1), from the viewpoints of increasing the bubble diameter of the bubble-containing gypsum slurry hardened body and decreasing the specific gravity of the bubble-containing gypsum slurry hardened body, 1a In the mass distribution of the carbon numbers of the alkyl or alkenyl groups having from 8 to 12 carbon atoms, the proportion of those having 12 carbon atoms is preferably 70 mass % or more, and more preferably 85 mass % or more. In general formula (a1), n ​​is the average number of moles of PO added, and is a number exceeding 0 and preferably 1 or more and 2 or less from the viewpoint of increasing the bubble diameter of the bubble-containing gypsum slurry hardened body.

[0066] The foaming agent composition for hydraulic composition of the present invention, the foaming hydraulic composition of the present invention, and the method for producing the foaming hydraulic composition of the present invention can be appropriately applied to the foaming gypsum slurry of the present invention. The foaming gypsum slurry of the present invention is suitable for use in gypsum boards.

[0067] The air bubble-containing gypsum slurry of the present invention preferably further contains component (B), which is an alkyl or alkenyl sulfate ester or a salt thereof. From the viewpoint of increasing the bubble size of the bubble-containing gypsum slurry hardened body, component (B) has an alkyl or alkenyl group, preferably an alkyl group, having 8 or more and 18 or less, preferably 16 or less, more preferably 14 or less, even more preferably 12 or less, and still more preferably 10 carbon atoms. The salt of component (B) may be one or more selected from alkali metal salts such as sodium salts and potassium salts, ammonium salts, and organic ammonium salts.

[0068] Specific examples of the (B) component include one or more selected from octyl sulfate, decyl sulfate, 2-ethylhexyl sulfate, 2-propylheptyl sulfate, lauryl sulfate, tridecyl sulfate, myristyl sulfate, cetyl sulfate, stearyl sulfate, oleyl sulfate, and salts thereof. From the viewpoint of increasing the diameter of the air bubbles in the bubble-containing gypsum slurry hardened body, one or more selected from octyl sulfate, decyl sulfate, 2-ethylhexyl sulfate, 2-propylheptyl sulfate, lauryl sulfate, and salts thereof are preferred, and decyl sulfate or a salt thereof is more preferred.

[0069] The bubble-containing gypsum slurry of the present invention preferably further contains component (C), which is a monohydric alcohol having 6 to 10 carbon atoms. The carbon number of the (C) component is 6 or more and 10 or less, and preferably 8, from the viewpoints of rapid foaming and foam stability. From the viewpoints of rapid foaming and foam stability, component (C) is a monohydric alcohol having a straight-chain or branched-chain hydrocarbon group, preferably a straight-chain or branched-chain alkyl group, and more preferably a straight-chain alkyl group.

[0070] Specific examples of the (C) component include one or more selected from hexanol, octanol, decanol, 2-ethylhexanol, and 2-propylheptanol. From the viewpoint of foamability, it is preferable to contain one or more selected from octanol and decanol, more preferably octanol. The content of one or more selected from octanol and decanol in the (C) component 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. The content of octanol in the (C) component 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.

[0071] The air bubble-containing gypsum slurry of the present invention preferably further contains component (D), which is a nonionic surfactant. The nonionic surfactant may be one or more selected from alkyl monoglyceryl ether, polyoxyalkylene monoalkyl or alkenyl ether, alkyl glycoside or alkyl polyglycoside (glycoside-type nonionic surfactant), sorbitan-based nonionic surfactant, aliphatic alkanolamide, fatty acid monoglyceride, and sucrose fatty acid ester. Among these, it is preferable to contain a glycoside-type nonionic surfactant from the viewpoint of increasing the diameter of bubbles in the bubble-containing gypsum slurry hardened body.

[0072] The glycoside nonionic surfactant is more preferably a compound represented by the following general formula (d1). R 1d -(OR 2d ) x G y (d1) [In the formula, R 1d R is a linear alkyl group having 8 or more carbon atoms, preferably 10 or more carbon atoms, and 16 or less carbon atoms, preferably 14 or less carbon atoms. 2dis 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 having an average value of 0 to 6. y is a number having an average value of 1 to 10, preferably 5 or less, more preferably 2 or less.

[0073] In the compound of general formula (d1), G is a residue derived from a reducing sugar. The reducing sugar of the raw material of G may be either an aldose or a ketose. In addition, the reducing sugar of the raw material of G may be a triose having a carbon number of 3, a tetrose having a carbon number of 4, a pentose having a carbon number of 5, or a hexose having a carbon number of 6. Specific examples of the aldose include apiose, arabinose, galactose, glucose, lyxose, mannose, galose, aldose, idose, talose, and xylose. In addition, specific examples of the ketose include fructose. The reducing sugar of the raw material of G of the present invention is preferably an aldopentose, which is an aldose having a carbon number of 5, or an aldohexose, which is an aldose having a carbon number of 6, and more preferably glucose.

[0074] The components (A), (B), (C), and (D) 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 contents of the components and their mass ratios described in the bubble-containing hydraulic composition of the present invention can be appropriately applied by substituting hydraulic powder for gypsum. In the hardened product of the gas bubble-containing gypsum slurry of the present invention, the specific gravity and the average gas bubble diameter are in the same ranges as those described for the gas bubble-containing hydraulic composition of the present invention.

[0075] Any type of gypsum can be used, including high-quality neutralized gypsum, phosphogypsum which is a by-product of phosphoric acid, flue gas desulfurization gypsum generated in thermal power generation, natural gypsum containing various impurities and clay, and mixtures of these. The clay contained in gypsum is mainly composed of hydrated silicate minerals (hereinafter referred to as clay minerals) with a layered structure, and the clay minerals contained as fine particles in this clay include kaolin minerals (kaolinite, dickite, and nacrite), serpentine (lizardite, antigorite, and chrysotile), mica clay minerals (illite, sericite, glauconite, and celadonite), chlorite, vermiculite, and smectite (montmorillonite, beidellite, nontronite, saponite, and hectorite).

[0076] Gypsum includes anhydrous gypsum, hemihydrate gypsum, dihydrate gypsum, etc. As the raw gypsum, natural gypsum, neutralized gypsum, by-product gypsum, or other chemical gypsum can be used alone or in combination of two or more of them. Examples of main chemical gypsum include phosphate gypsum, hydrofluoric gypsum, titanic gypsum, and flue gas desulfurization gypsum. The raw gypsum may also include recycled gypsum. The recycled gypsum may be any recycled gypsum recovered from waste gypsum boards generated by gypsum board manufacturers, waste gypsum boards generated during new construction and demolition, etc. The present invention can be suitably used for any of these raw gypsum, and excellent effects can be obtained for those blended in various ratios.

[0077] The bubble-containing gypsum slurry of the present invention can contain additives used for gypsum boards, etc. Such additives include general-purpose water-reducing agents, defoamers, foam stabilizers, hardening regulators, water repellents, adhesives, retarders, etc. Furthermore, glass fibers, carbon fibers, waste paper, virgin pulp, etc. can be added as reinforcing fibers, or gypsum boards can be produced together with lightweight aggregates such as perlite and foamed steel.

[0078] The foam-containing gypsum slurry of the present invention can be produced using the foaming agent composition for hydraulic compositions of the present invention. That is, the present invention provides a method for producing an air-bubble gypsum slurry, which includes 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 a foam. <Process 2> A step of mixing gypsum, water, and the foam obtained in step 1. In step 2, a gypsum slurry containing gypsum and water may be prepared, and the gypsum slurry may be mixed with the foam obtained in step 1.

[0079] This manufacturing method allows the preparation of the air-bubble gypsum slurry of the present invention. The method for producing the bubble-containing gypsum slurry of the present invention can be appropriately applied to the foaming agent composition for hydraulic composition of the present invention, the bubble-containing hydraulic composition and its production method of the present invention, and the aspects described for the bubble-containing gypsum slurry of the present invention. In the manufacturing method of the bubble-containing hydraulic composition of the present invention, the contents of the components and their mass ratios described in the bubble-containing hydraulic composition of the present invention can be appropriately applied by replacing the hydraulic powder with gypsum and further replacing the contents of the components with the mixing amounts. The temperatures of the foam and gypsum slurry used for mixing are preferably 15°C or higher and 40°C or lower, 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

[0080] The components used in the examples and comparative examples are shown below. Component (A) ·APS: In general formula (a1), R 1a is a compound in which the alkyl group has 8 to 12 carbon atoms, n is 1, and M is a sodium ion APS was synthesized using the method described in paragraph 0027 of JP 2014-1330 A. Specifically, an average of 1 mole of propylene oxide was added to 1 mole of a mixed alcohol of linear primary alcohol having 8 carbon atoms / linear primary alcohol having 10 carbon atoms / linear primary alcohol having 12 carbon atoms in a mass ratio of 5 / 5 / 90 to obtain an alkoxylate, which was then sulfated and neutralized with sodium hydroxide to obtain APS. The obtained APS is represented by the general formula (a1), in which R1a In the mass distribution of the carbon numbers of the alkyl or alkenyl groups having 8 to 18 carbon atoms, the proportion of the carbon number of 12 was 90 mass%.

[0081] Component (A') (comparison component to component (A)) AES(3): Polyoxyethylene(3) lauryl ether sulfate sodium (the number in parentheses is the average number of moles of oxyethylene groups added) AES(1): Polyoxyethylene(1) lauryl ether sulfate sodium (the number in parentheses is the average number of moles of oxyethylene groups added) (B) Component C10AS: Sodium decyl sulfate, (C) Component C8OH: Octanol, product name "Kalcol 0898" manufactured by Kao Corporation (D) Component AG: Alkyl polyglycoside (lauryl glycoside), product name "Mydol 12" 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 to 3 were prepared by the following method. Each raw material was added to a 100mL screw tube in the specified ratio so that the total amount was 100g, and stirred with a stirrer at 1000 rpm for 3 hours. If the solution viscosity was high and the stirring efficiency was poor, the solution was heated to 40℃ as needed.

[0083] (2) Storage stability evaluation 100 mL of the foaming agent composition for hydraulic compositions prepared in Tables 1 and 2 was placed in a transparent screw tube and left to stand for one day in a thermostatic chamber set to the temperature shown in Tables 1 and 2. The state of the foaming agent composition for hydraulic compositions after the standing was visually confirmed and evaluated according to the following criteria. The results are shown in Tables 1 and 2. Liquid: When the screw tube is turned upside down, the liquid begins to flow within one second. High viscosity gelation: When the screw tube is turned upside down, it takes more than 2 seconds to flow. Gelling: When the screw tube is turned upside down in the vertical direction, it does not flow.

[0084] (3) Preparation of gypsum slurry The foaming agent composition for hydraulic compositions shown in Tables 1 to 3 was mixed with water to obtain an aqueous solution prepared so that the concentration (as is) of the foaming agent composition for hydraulic compositions was as shown in Tables 1 to 3. 19 g of the prepared aqueous solution was added to a 1-L disposable cup, and the mixture was stirred for 15 seconds at 2000 rpm (EUROSTAR200 control, IKA Japan Co., Ltd.) using a flat 6-blade paddle blade (FP-50, AS ONE Co., Ltd.) while rotating the container by hand, and then the container was placed and stirred for another 45 seconds to obtain a foam. 200 g of calcined gypsum, 4 g of dihydrate gypsum, 127 g of tap water in which 1.5 g of potassium sulfate was dissolved, and 0.36 g of a water reducing agent (Mitei 150, manufactured by Kao Corporation) were added to a 500 mL 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 gypsum slurry before adding foam. The entire amount of the prepared gypsum slurry was added to 19 g of foam prepared in a 1 L disposable cup, and the mixture was kneaded for 10 seconds at 1150 rpm using the flat 6-blade paddle in the 1 L disposable cup to obtain a gypsum slurry containing air bubbles. The temperatures of the foam and gypsum slurry used for kneading were both 20°C.

[0085] (4) Measurement of specific gravity of gypsum specimen The resulting gypsum slurry containing bubbles was poured into a cylindrical specimen mold (Plamold, manufactured by Nifco Corporation) with a diameter of 5 cm and a height of 10 cm, and left to stand at room temperature for at least 1 hour. The hardened gypsum slurry was removed from the cylindrical specimen mold and left to stand in a thermostatic chamber at 80°C for 17 hours to dry, after which the weight of the specimen was measured. The specific gravity of the gypsum specimen was obtained by dividing the weight of the specimen obtained by the volume of the mold. The results are shown in Tables 1 to 3.

[0086] (5) Measurement of the average bubble diameter in gypsum A cut was made in the 5 cm high section of the obtained gypsum specimen to create a cross section of the hardened body. The cross section was observed with a digital microscope (42x magnification), and the diameters of 100 bubble cross sections were measured, starting from the smallest visible bubble, and the average bubble diameter was calculated from the arithmetic mean of these values. When the bubble cross section was circular, the diameter was taken as the diameter; when the bubble cross section was elliptical, the major axis was taken as the diameter; and when the bubble cross section was irregular, the longest part was taken as the diameter. The results are shown in Tables 1 to 3.

[0087] (6) Penetration resistance test The penetration resistance value was measured when a needle with a diameter of 12.5 mm was pressed 6 cm into the side of the cylindrical specimen in Table 1 obtained in (4). The measurement was performed three times on the side of the cylindrical specimen at points 2.5 cm, 5 cm, and 7.5 cm from the bottom, and the average value was taken as the penetration resistance value of the specimen. The results are shown in Table 1. The higher the penetration resistance value, the higher the strength of the gypsum specimen.

[0088] [Table 1]

[0089] From the results in Table 1, when the specific gravity of the hardened body of the gypsum slurry is about the same, Example 1-1 using the compound represented by general formula (a1) as component (A) of the present invention has a larger average bubble diameter in the hardened body of the gypsum slurry than Comparative Examples 1-1 and 1-2 using polyoxyethylene (3) lauryl ether sulfate as a comparative component of component (A) or polyoxyethylene (3) lauryl ether sulfate, and can increase the strength of the hardened body of the gypsum slurry. In addition, it can be seen that the foaming agent composition for hydraulic compositions of Example 1-1 has better storage stability at 10°C than Comparative Examples 1-1 and 1-2.

[0090] [Table 2]

[0091] From the results in Table 2, it can be seen that, among Examples 2-1 to 2-6, the smaller the mass ratio (A) / (B), the more improved the storage stability at low temperatures of 5° C. or less. On the other hand, even if the concentration of the foaming agent composition for hydraulic compositions is the same, the larger the mass ratio (A) / (B), the smaller the specific gravity and the more lightweight the composition can be.

[0092] [Table 3]

[0093] From the results in Table 3, it can be seen that, among Examples 3-1 to 3-9, by blending the (C) component and / or the (D) component under the same mass ratio (A) / (B) in the foaming agent composition for hydraulic composition, the specific gravity tends to be smaller, and the weight can be further reduced. In addition, the average bubble diameter tends to be larger, and it is expected that the strength will be higher than that of a hardened body with the same specific gravity.

Claims

1. (A) A foaming agent composition for hydraulic compositions, comprising a compound represented by the following general formula (a1) (hereinafter referred to as component (A)): R １ａ O-(PO) ｎ -SO ３ -M (a1) [In the formula, R １ａ represents an alkyl or alkenyl group having from 8 to 18 carbon atoms, PO represents a propyleneoxy group, n represents the average number of moles added and is a number greater than 0 and equal to or less than 2, and M represents an alkali metal ion, an ammonium ion, or an alkanolammonium ion.

2. In general formula (a1), R １ａ 2. The foaming agent composition for hydraulic compositions according to claim 1, wherein the proportion of 12 carbon atoms in the mass distribution of the carbon atoms of the alkyl or alkenyl groups having 8 to 18 carbon atoms is 70 mass% or more.

3. The foaming agent composition for hydraulic compositions according to claim 1 or 2, comprising 2% by mass or more and 40% by mass or less of the component (A).

4. 3. The foaming agent composition for hydraulic compositions according to claim 1, further comprising (B) an alkyl or alkenyl sulfate ester or a salt thereof (hereinafter referred to as component (B)).

5. 5. The foaming agent composition for hydraulic compositions according to claim 4, wherein the mass ratio (A) / (B) of the content of the component (A) to the content of the component (B) is 5 / 95 or more and 90 / 10 or less.

6. 5. The foaming agent composition for hydraulic compositions according to claim 4, wherein component (B) is an alkyl or alkenyl sulfate ester having an alkyl or alkenyl group having 8 to 12 carbon atoms, or a salt thereof.

7. The foaming agent composition for hydraulic compositions according to claim 1 or 2, further comprising (C) a monohydric alcohol having 6 to 10 carbon atoms.

8. The foaming agent composition for hydraulic compositions according to claim 1 or 2, further comprising (D) a nonionic surfactant.

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

10. A bubble-containing hydraulic composition comprising a hydraulic powder, water, and (A) a compound represented by the following general formula (a1) (hereinafter referred to as component (A)): R １ａ O-(PO) ｎ -SO ３ -M (a1) [In the formula, R １ａ represents an alkyl or alkenyl group having from 8 to 18 carbon atoms, PO represents a propyleneoxy group, n represents the average number of moles added and is a number greater than 0 and equal to or less than 2, and M represents an alkali metal ion, an ammonium ion, or an alkanolammonium ion.

11. 11. The bubble-containing hydraulic composition according to claim 10, comprising 0.0001 to 0.02 parts by mass of component (A) per 100 parts by mass of the hydraulic powder.

12. The bubble-containing hydraulic composition according to claim 10 or 11, further comprising (B) an alkyl or alkenyl sulfate ester or a salt thereof (hereinafter referred to as component (B)).

13. 13. The bubble-containing hydraulic composition according to claim 12, wherein the mass ratio (A) / (B) of the content of the component (A) to the content of the component (B) is 5 / 95 or more and 90 / 10 or less.

14. 13. The bubble-containing hydraulic composition according to claim 12, wherein component (B) is an alkyl or alkenyl sulfate ester having an alkyl or alkenyl group having from 8 to 12 carbon atoms, or a salt thereof.

15. The bubble-containing hydraulic composition according to claim 10 or 11, further comprising (C) a monohydric alcohol having from 6 to 10 carbon atoms.

16. The bubble-containing hydraulic composition according to claim 10 or 11, further comprising (D) a nonionic surfactant.

17. 12. The bubble-containing hydraulic composition according to claim 10 or 11, wherein the hydraulic powder is gypsum.

18. The bubble-containing hydraulic composition according to claim 10 or 11, 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.

19. 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 hydraulic powder, water, and the foam obtained in step 1.

20. The method for producing a bubble-containing hydraulic composition according to claim 19, wherein the hydraulic powder is gypsum.