Method for manufacturing geopolymer cured body

Abstract

To provide a method for producing a geopolymer cured body having an excellent surface finish with no trace of repellent-like bubbles on a surface of the cured body and causing no adverse effects on post-processing, such as painting.SOLUTION: There is provided a method for producing a geopolymer cured body by interposing an aqueous silicone dispersion between a molding tool and a geopolymer composition. The aqueous silicone dispersion is formed by dispersing a dispersant containing a silicone oil compound and a polyether modified silicone in an aqueous medium containing a sorbitan fatty acid ester having an HLB of 2 to 6 and a nonionic surfactant having an HLB of 15 to 19.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a geopolimer cured body used in building materials and the like.

Background Art

[0002] A geopolimer composition mainly composed of an aqueous alkali metal silicate solution and a curing agent can be filled into a mold, and after curing, the mold can be removed to obtain a cured body. Examples of the mold used here include a mold made of a synthetic resin or rubber material that does not require a mold release agent, and a mold such as a metal mold to which a mold release agent or wax is applied to impart mold release properties. However, there are problems in that sufficient mold release properties may not be obtained due to the mixing of the aqueous alkali metal silicate solution contained in the geopolimer composition and the mold release agent, and even in the case of a mold made of a synthetic resin or rubber material that does not require a mold release agent, the compatibility between the mold surface and the geopolimer composition deteriorates due to the presence of the aqueous alkali metal silicate solution, and repelling bubbles are likely to occur between the two, which may deteriorate the appearance of the obtained cured body.

[0003] For this reason, for example, Patent Document 1 discloses a method of applying a silicone emulsion-based surfactant to the surface (mold surface) of a mold whose mold surface is formed of a synthetic resin or rubber material to improve the compatibility between the curable material and the mold and achieve a cured body with good appearance. Further, Patent Document 2 discloses a method for manufacturing a cured body in which an aqueous solution of a surfactant other than a silicone emulsion is applied to the surface of a mold in advance, and the surface finish is excellent and there is no adverse effect on post-processing.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the method described in Patent Document 1, it is necessary to apply a large amount of a silicone emulsion, which is a surfactant, to the mold surface, and the silicone oil in the emulsion remains on the surface of the cured body. This remaining silicone oil has a problem that when post-processing such as painting is performed on the surface of the cured body, the adhesion of the coating film deteriorates. Further, in the method described in Patent Document 2, the surfactant dries in a short time after application and cannot fully exhibit its effect. Also, when the application amount is increased to prevent drying, it has a problem of adversely affecting the curing of the product surface.

[0006] The present invention has been made in view of the above problems, and its object is to provide a method for producing a diopolymer cured body in which there are no traces of repellent bubbles on the surface of the cured body, the surface finish is excellent, and post-processing such as painting is not adversely affected.

[0007] That is, the present invention is directed to the following [1] to [7]. [1] A method for producing a diopolymer cured body by interposing an aqueous silicone dispersion between a mold and a diopolymer composition, wherein the silicone dispersion contains a sorbitan fatty acid ester having an HLB of 2 or more and 6 or less and a nonionic surfactant having an HLB of 15 or more and 19 or less in an aqueous medium in which a dispersion containing a silicone oil compound and a polyether-modified silicone is dispersed and is a dispersion. A method for producing a diopolymer cured body. [2] A method for producing a diopolymer cured body according to [1], comprising a step of applying an aqueous silicone dispersion to at least a part of the surface of the mold in contact with the diopolymer composition and a step of applying the diopolymer composition into the mold. [3] The method for producing a geopolimer cured body according to [2], further including a step of applying a curable material into a mold after the step of applying the geopolimer composition. [4] The method for producing a geopolimer cured body according to any one of [1] to [3], wherein the sorbitan fatty acid ester having an HLB of 2 or more and 6 or less is sorbitan monostearate. [5] The nonionic surfactant having an HLB of 15 or more and 19 or less is one or more selected from polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, polyoxyalkylene alkyl aryl ethers, polyoxyalkylene aralkyl aryl ethers, and polyoxyalkylene polyhydric alcohol fatty acid esters. The method for producing a geopolimer cured body according to any one of [1] to [3]. [6] The method for producing a geopolimer cured body according to any one of [1] to [3], wherein the silicone oil compound consists of silicone oil (a) and fine powder silica (b), and the silicone oil (a) is dimethylpolysiloxane. [7] An aqueous silicone dispersion containing a dispersoid containing a silicone oil compound and a polyether-modified silicone dispersed in an aqueous medium containing a sorbitan fatty acid ester having an HLB of 2 or more and 6 or less and a nonionic surfactant having an HLB of 15 or more and 19 or less, a mold wetting agent for producing a geopolimer cured body. [Effects of the Invention]

[0008] According to the production method of the present invention, it is possible to provide a method for producing a geopolimer cured body in which there are no traces of foaming on the surface, the surface finish is excellent, repelling at the end of the surface layer is suppressed, and deterioration of the adhesion of the coating film during post-processing such as coating can be prevented. [Brief Description of the Drawings]

[0009]

Figure 1

DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention relates to a method for producing a geopolimer cured body by interposing an aqueous silicone dispersion between a mold and a geopolimer composition, wherein the silicone dispersion is a dispersion in which a dispersion medium containing a sorbitan fatty acid ester having an HLB of 2 or more and 6 or less and a nonionic surfactant having an HLB of 15 or more and 19 or less contains a silicone oil compound and a polyether-modified silicone.

[0011] [Aqueous silicone dispersion · Mold wetting agent for producing geopolimer cured body] The aqueous silicone dispersion used in the present invention is a dispersion in which a dispersion medium containing a sorbitan fatty acid ester having an HLB of 2 or more and 6 or less and a nonionic surfactant having an HLB of 15 or more and 19 or less contains a silicone oil compound and a polyether-modified silicone. The above aqueous silicone dispersion can function as a component of a mold wetting agent for producing a geopolimer cured body. That is, a mold wetting agent for producing a geopolimer cured body containing the above aqueous silicone dispersion is also an object of the present invention. Although the detailed mechanism of action of the mold wetting agent for producing a geopolimer cured body is unknown, it is presumed to have at least the function of wetting a hydrophobic surface such as a synthetic resin or a rubber material and improving the compatibility with a hydrophilic substance in contact with the surface. That is, in the present invention, when a geopolimer cured body is produced using a mold having a hydrophobic surface such as a synthetic resin or a rubber material as the mold surface, by applying the mold wetting agent for producing a geopolimer cured body to the hydrophobic mold surface, the compatibility between the geopolimer forming material, which is a hydrophilic material, and the mold surface is improved, the entrapment of air bubbles that may occur between the geopolimer forming material and the mold surface is suppressed, and it is considered possible to produce a geopolimer cured body having excellent aesthetics.

[0012] <Silicone oil compound> The silicone oil compound used in the present invention is the main component for imparting defoaming properties to an aqueous silicone dispersion, and is composed of silicone oil (a) and fine powder silica (b). The silicone oil compound may be used alone or in combination of two or more.

[0013] (a) Silicone oil The silicone oil may be either linear or branched, and may be used alone or in combination of two or more. The silicone oil may also include those having a crosslinked structure. Examples of the silicone oil include those having the structure represented by the following average composition formula (1): R a SiO (4-a) / 2 (1) (In the formula, R is independently a non-substituted or substituted monovalent hydrocarbon group, and a is a number from 1.9 to 2.2.) Those having the structure represented by the above formula (1) (also referred to as organopolysiloxane) may be mentioned. The silicone oil represented by the above formula (1) is essentially hydrophobic.

[0014] In the above formula (1), R is preferably, independently of each other, an unsubstituted or substituted monovalent hydrocarbon group having 1 to 18 carbon atoms. Examples of the monovalent hydrocarbon group include alkyl groups such as methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, dodecyl group, tridecyl group, tetradecyl group, hexadecyl group, octadecyl group, etc.; cycloalkyl groups such as cyclohexyl group; alkenyl groups such as vinyl group, allyl group, etc.; aryl groups such as phenyl group, tolyl group, etc.; aralkyl groups such as styryl group, α-methylstyryl group, etc., or a part or all of the hydrogen atoms bonded to the carbon atoms of these groups are substituted with halogen atoms, cyano group, amino group, hydroxy group, etc., such as chloromethyl group, 3-chloropropyl group, 3,3,3-trifluoropropyl group, cyanoethyl group, 3-aminopropyl group, N-(β-aminoethyl)-γ-aminopropyl group, etc. Among them, from the viewpoints of defoaming property and economy, it is preferable that 80% or more, particularly 90% or more of the total number of groups represented by R are methyl groups. a satisfies 1.9 ≦ a ≦ 2.2, and preferably satisfies 1.95 ≦ a ≦ 2.15. The terminals of the organopolysiloxane may be blocked with a triorganosilyl group represented by R3Si-, or may be blocked with a diorganohydroxysilyl group represented by HOR2Si-.

[0015] From the viewpoints of defoaming property and workability, the silicone oil has a viscosity at 25 °C measured by an Ostwald viscometer of 10 to 100,000 mm 2 / s, preferably 50 to 10,000 mm 2 / s. If it is less than the above lower limit, the defoaming performance of the silicone oil compound is poor, and if it exceeds the above upper limit, the viscosity of the silicone oil compound increases and the workability deteriorates.

[0016] Preferable examples of the silicone oil represented by the above formula (1) include dimethylpolysiloxane, diethylpolysiloxane, methylphenylpolysiloxane, dimethylsiloxane-diphenylsiloxane copolymer, methyl(3,3,3-trifluoropropyl)polysiloxane, and α,ω-dihydroxydimethylpolysiloxane. As these commercially available products, for example, as dimethylpolysiloxane, there are KF-9008, KF-9011, KF-9013, KF-9014, KF-9028, KF-9030, MK-15H, X-21-5495, KF-9028, KF-9030, X-21-5613, X-21-5666, X-21-5847, and X-21-5849 (above, Shin-Etsu Chemical Co., Ltd.); SH200-1,000,000cs, BY16-140, BY11-003, BY11-007, BY11-014, BY11-026, BY11-040, BY22-019, BY22-020, BY22-034, BY22-055, BY22-060, and BY25-320 (above, Toray Dow Corning Co., Ltd.). Also, as α,ω-dihydroxydimethylpolysiloxane, there are X-21-5613, X-21-5666 (above, Shin-Etsu Chemical Co., Ltd.); 1501Fluid, 1503Fluid, and CB-1556Fluid (above, Toray Dow Corning Co., Ltd.).

[0017] (b) Fine silica powder The fine silica powder may be a known one. For example, wet silica such as precipitated silica, dry silica such as silica xerogel and fumed silica can be used. All of the above silicas are hydrophilic silicas. In the present invention, the hydrophilic silica may be used as it is, or a hydrophobic silica obtained by surface-treating with a compound having an organic silyl group may be used. The fine silica powder may be used alone or in combination of two or more.

[0018] Commercially available fine powder silica can be used. For example, by trade name, Aerosil (registered trademark) (manufactured by Nippon Aerosil Co., Ltd.), Nipsil (registered trademark), Nipjel (registered trademark) (both manufactured by Tosoh Silica Corporation), Silicia (registered trademark) (manufactured by Fuji Silysia Chemical Ltd.), etc. can be mentioned. The fine powder silica preferably has a specific surface area of 100 m 2 / g or more by the BET method, more preferably 100 to 500 m 2 / g, still more preferably 150 to 500 m 2 / g.

[0019] In the silicone compound according to the present invention, the ratio of silicone oil (a) to fine powder silica (b) can be, for example, silicone oil (a): fine powder silica (b) = 60 to 99.9 parts by mass: 0.1 to 40 parts by mass in terms of mass ratio, and also, for example, 80 to 99 parts by mass: 1 to 20 parts by mass. If the amount of silicone oil is too large (the amount of fine powder silica is too small), the defoaming performance is poor. If the amount of silicone oil is too small (the amount of fine powder silica is too large), there is a concern that the viscosity of the silicone oil compound increases and the workability deteriorates.

[0020] <Polyether-modified silicone> Polyether-modified silicone is generally a compound having a polyether chain as a side chain in a silicone chain (side chain type), and compounds having a silicone chain at one end of the polyether chain (one-end type) or at both ends of the polyether chain (both-ends type) can also be included. The polyether chain is represented by, for example, the general formula: (EO) n (PO) m (where EO is an ethoxy group, PO is a propoxy group, and n and m represent natural numbers including 0).

[0021] Commercially available polyether-modified silicone can be used. For example, FLUID L053, FLUID L060, FLUID L066, IM22, WACKER-Belsil DMC 6038 (manufactured by Asahi Kasei Wacker Silicone Co., Ltd. as above), KF-352A, KF-353, KF-615A, X-22-4515, KF-354L, KF-355A, KF-6011, KF-6012, KF-6015, KF-6017, KF-6020, KF-6204, KF-640, KF-642, KF-643, KF-644, KF-945 (manufactured by Shin-Etsu Chemical Co., Ltd. as above), 8526 ADDITIVE, FZ-2203, FZ-5609, L-7001, SF 8410, FZ-2104, FZ-2108, FZ-2110, FZ-2123, FZ-2162, FZ-2164, FZ-2191, L-7002, L-7604, SH8400, SH8700 (manufactured by Toray Dow Corning Co., Ltd. as above), TSF4440, TSF4441, TSF4445, TSF4446, TSF4450, TSF4452, TSF4460 (manufactured by Momentive Performance Materials Japan LLC as above), etc. can be mentioned.

[0022] <Sorbitan fatty acid esters with an HLB of 2 or more and 6 or less> Sorbitan fatty acid esters are a type of nonionic surfactant. Examples of sorbitan fatty acid esters with an HLB of 2 or more and 6 or less used in the present invention include, but are not limited to, sorbitan monostearate (HLB: 4.7), sorbitan monooleate (HLB: 4.3), etc. Among these, sorbitan monostearate is preferred as the sorbitan fatty acid ester with an HLB of 2 or more and 6 or less.

[0023] <Nonionic surfactants with an HLB of 15 or more and 19 or less> Examples of nonionic surfactants with an HLB of 15 or more and 19 or less used in the present invention include one or more polyoxyalkylene compounds selected from polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, polyoxyalkylene alkyl aryl ethers, polyoxyalkylene aralkyl aryl ethers, and polyoxyalkylene polyhydric alcohol fatty acid esters.

[0024] Examples of the alkyl group constituting the polyoxyalkylene alkyl ether include alkyl groups having 8 to 24 carbon atoms, such as octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, eicosyl group, heneicosyl group, docosyl group, tricosyl group, and tetracosyl group. These alkyl groups may be linear, branched, cyclic, or a combination thereof. Examples of the alkenyl group constituting the polyoxyalkylene alkenyl ether include alkenyl groups having 8 to 24 carbon atoms, such as octenyl group, nonenyl group, decenyl group, undecenyl group, dodecenyl group, tridecenyl group, tetradecenyl group, pentadecenyl group, hexadecenyl group, heptadecenyl group, octadecenyl group, nonadecenyl group, eicosenyl group, heneicosenyl group, docosenyl group, tricosenyl group, and tetracosenyl group. These alkenyl groups may be linear, branched, cyclic, or a combination thereof. Among these alkenyl groups, a preferred group is an oleyl group (9-octadecenyl group). Examples of the alkylaryl group constituting the polyoxyalkylene alkylaryl ether include nonylphenyl group, octylphenyl group, etc. Examples of the aralkylaryl group constituting the polyoxyalkylene aralkylaryl ether include styrenated phenyl group, etc.

[0025] In the polyoxyalkylene polyhydric alcohol fatty acid ester, examples of the polyhydric alcohol structure constituting the ester include 2- to 8-valent polyhydric alcohols having 2 to 30 carbon atoms ( structure). The polyhydric alcohol (structure) may be linear, and when it has 3 or more carbon atoms, it may contain branched chains, cyclic chains, unsaturated double bonds, and multiple hydroxy groups may be bonded to the same carbon atom. The above-mentioned di- to octavalent polyhydric alcohols are specifically compounds having 2 to 8 hydroxy groups. Examples thereof include dihydric alcohols (ethylene glycol, diethylene glycol, propylene glycol, butanediol, neopentyl glycol, and hexanediol); tri- to pentavalent polyhydric alcohols (glycerin, trimethylolpropane, pentaerythritol, dipentaerythritol, sorbitan, and diglycerin); saccharides and their derivatives (sucrose, glucose, fructose, methyl glycoside, etc.). Among these, tri- to pentavalent polyhydric alcohols and saccharides are preferably used, and sorbitol, sorbitan, polyglycerin, pentaerythritol, dipentaerythritol, and sucrose are more preferably used. Moreover, as the fatty acid structure constituting the above ester, a structure derived from a fatty acid having 8 to 30 carbon atoms can be exemplified. Examples of the fatty acid include octanoic acid (caprylic acid), nonanoic acid (pelargonic acid), decanoic acid (capric acid), dodecanoic acid (lauric acid), tetradecanoic acid (myristic acid), pentadecanoic acid, hexadecanoic acid (palmitic acid), hexadecenoic acid (palmitoleic acid, etc.), heptadecanoic acid (margaric acid), octadecanoic acid (stearic acid), octadecenoic acid (oleic acid, vaccenic acid, etc.), octadecadienoic acid (linoleic acid, etc.), octadecatrienoic acid (linolenic acid, eleostearic acid, etc.), eicosanoic acid (arachidic acid), eicosadienoic acid, eicosatrienoic acid (mead acid, etc.), eicosatetraenoic acid (arachidonic acid, etc.), docosanoic acid (behenic acid), tetracosanoic acid (lignoceric acid), tetracosanoic acid (nervonic acid, etc.), hexacosanoic acid (cerotic acid), octacosanoic acid (montanic acid), triacontanoic acid (melissic acid), etc.

[0026] In the above-mentioned ether and ester compounds, the added molar number of the oxyalkylene group is 1 to 200, and can be, for example, 20 to 200, or 30 to 150, or 40 to 120. The above oxyalkylene group can include oxyalkylene groups having 2 to 4 carbon atoms such as oxyethylene group, oxypropylene group, oxybutylene group, etc. When two or more oxyalkylene groups are added, they may be composed of the same kind of oxyalkylene group or composed of two or more kinds of oxyalkylene groups. In the latter case, the different kinds of oxyalkylene groups may be block-added or randomly added. From the viewpoint of adjusting the HLB, the oxyethylene group can be preferably used as the above alkylene group.

[0027] Specific examples of the nonionic surfactant having an HLB of 15 or more and 19 or less include, but are not limited to, sorbitan trioleate - 100EO (HLB: 16.4), sorbitan trioleate - 80EO (HLB: 15.6), oleyl alcohol - 60EO (HLB: 18.3), polyoxyethylene tristyrylated phenyl ether (HLB: 17.3), etc. Among these, as the nonionic surfactant having an HLB of 15 or more and 19 or less, sorbitan trioleate 100EO or oleyl alcohol - 60EO is preferable.

[0028] The HLB value in the nonionic surfactant is defined by the Griffin's formula shown below. HLB value = 20 × Mw / M In the formula, M is the molecular weight of the nonionic surfactant, and Mw is the molecular weight of the hydrophilic part of the nonionic surfactant. Based on the above Griffin's formula, any compound corresponding to a sorbitan fatty acid ester having an HLB value of 2 or more and 6 or less, or a compound corresponding to a nonionic surfactant having an HLB value of 15 or more and 19 or less can be used as the above-mentioned component in the aqueous silicone dispersion according to the present invention. It is.

[0029] <aqueous medium> As the above aqueous medium, those not containing components that inhibit the storage stability of the aqueous silicone dispersion according to the present invention are preferable, and examples include water such as ion-exchanged water, distilled water, well water, tap water, etc.

[0030] In the aqueous silicone dispersion according to the present invention, the compounding ratios of the silicone oil compound, polyether-modified silicone, sorbitan fatty acid ester with an HLB of 2 or more and 6 or less, and nonionic surfactant with an HLB of 15 or more and 19 or less are, for example, silicone compound: 20 to 50% by mass, polyether-modified silicone: 20 to 50% by mass, sorbitan fatty acid ester: 10 to 40% by mass, nonionic surfactant: 5 to 30% by mass (total 100% by mass), or alternatively, silicone compound: 30 to 40% by mass, polyether-modified silicone: 30 to 40% by mass, sorbitan fatty acid ester: 15 to 25% by mass, nonionic surfactant: 10 to 20% by mass (total 100% by mass).

[0031] If the total concentration of the solid content in the above aqueous silicone dispersion is too low, it is difficult to obtain the effect, and if it is too high, it becomes difficult to disperse in the aqueous medium. Therefore, for example, it can be 0.05 to 50% by mass, or 0.1 to 20% by mass, or alternatively 5 to 20% by mass, 10 to 20% by mass. The solid content refers to the silicone oil compound, polyether-modified silicone, sorbitan fatty acid ester, nonionic surfactant, and thickeners described later, etc., provided that the water (aqueous medium) contained in these components is excluded.

[0032] <Other components> A thickener may be added to the wetting agent containing the above aqueous silicone dispersion to improve adhesion to the mold. Examples of the thickener include water-soluble polymers such as methylcellulose, carboxymethylcellulose, polyvinyl alcohol, and polyacrylamide; polysaccharides such as xanthan gum, welan gum, diutan gum, and glucan; and inorganic thickeners such as sepiolite and antigorite. The above thickener can be added so as to have a concentration of, for example, 0.01 to 1% by mass of the organic thickener and 0.1 to 10% by mass of the inorganic thickener based on the total amount of the wetting agent containing the aqueous silicone dispersion. In addition, dispersants and preservatives may be added to the wetting agent containing the aqueous silicone dispersion described above.

[0033] [Geopolymer (GP) Composition] The geopolymer (hereinafter referred to as GP) composition according to the present invention is composed of a mixture containing an active filler which is a source of aluminosilicate (aluminum silicate), an alkali source such as an alkali silica solution, and aggregates. Hereinafter, the GP composition and the GP cured body which is a cured product thereof will be described in detail.

[0034] The GP composition according to the present invention contains at least one of various active fillers described later as a source of aluminosilicate, and also contains a so-called water glass or the like described later as an alkali source.

[0035] <Active Fillers such as Aluminosilicate> The active filler such as aluminosilicate contains aluminosilicate, and elutes aluminate ions, silicate ions, and their complexes by contact with a highly alkaline solution (alkali silica solution) described later, and has a function as a source thereof. Suitable examples of the active filler such as aluminosilicate include 1) industrial wastes and by-products such as fly ash, clinker ash, fluidized bed coal ash, blast furnace slag fine powder, municipal solid waste incineration ash molten slag fine powder, red mud, and sewage sludge incineration ash molten slag fine powder, 2) natural aluminosilicate minerals such as metakaolin and clay and their calcined products, and 3) pozzolan.

[0036] Among these, in the present invention, the natural aluminosilicate minerals such as metakaolin and clay and their calcined products described in 2) above can be preferably used. Metakaolin is obtained by making kaolin, which is a clay mineral, into a slurry if necessary, firing it at a high temperature (for example, 600 to 900 ° C), and pulverizing it to an arbitrary particle size. By this firing, the crystal structures of silica (SiO2) and alumina (Al2O3) become amorphous.

[0037] Compared with other sources of aluminosilicates (active fillers), the industrial waste in 1) above has no production area restrictions and contributes to the effective utilization of industrial waste resources. Therefore, it is widely used as a source of aluminosilicates in conventional GP compositions. Fly ash mainly consists of silica (SiO2) and alumina (Al2O3). In JIS A 6201, its grades are specified as Types I to IV (JIS A6201) based on particle size and flow value. Types I and II of JIS, which have fine particle size and high reactivity, are particularly suitable as raw materials for geopolymers. Clinker ash is obtained by pulverizing the sintered coal ash recovered from the bottom of a coal combustion boiler. Both fly ash and clinker ash are useful as alkali silicate sources because the silica (SiO2) and alumina (Al2O3) components account for 70 - 90% of the total mass. Fine powder of blast furnace slag is a by - product produced during the purification of iron in a blast furnace. It mainly consists of calcium oxide (CaO), silica (SiO2), and alumina (Al2O3), and its standards are specified in JIS A 6206. In addition, municipal solid waste incineration ash - melted slag is obtained by melting and cooling the ash generated during the incineration of municipal solid waste at a high temperature. Similar to blast furnace slag, oxides such as silicon, aluminum, and calcium are the main components. Fluidized - bed coal ash is the ash generated from a pressurized fluidized - bed coal boiler. It is characterized by a high content of CaO because limestone fine powder is mixed for desulfurization in the furnace to burn coal. Although fluidized - bed coal ash does not meet the current JIS standards (JIS A 6201) for fly ash used as a concrete admixture, it can be used as an alkali silicate source. Incidentally, sewage sludge incineration ash - melted slag is obtained by concentrating and dehydrating the sludge generated from sewage treatment, then incinerating the ash at about 800 °C and further melting and cooling it at a higher temperature. Sewage sludge incineration ash is classified according to the type of flocculant added during dehydration, that is, it is classified into lime - based incineration ash added with slaked lime and ferric chloride, and polymer - based incineration ash added with a polymer flocculant.

[0038] <Alkali source: alkali silicate solution, etc.> In the present invention, the alkali source refers to an aqueous solution of a compound exhibiting high alkalinity. The alkali source activates the active fillers such as the aluminosilicate by contacting them, and the components such as eluted aluminum and silicon and the alkali component (OH - ) act to form silicate ions and aluminate ions. As the compound to be used as the alkali source, in addition to 1) alkali hydroxides such as sodium hydroxide and potassium hydroxide, 2) alkali carbonate salts such as sodium carbonate and potassium carbonate, and 3) alkali silicate salts such as sodium silicate, potassium silicate, and lithium silicate, combinations of 1) to 3) can be preferably used.

[0039] Among the above, sodium compounds are more suitable in terms of price. Also, when using 3) alkali silicate salts, since it itself serves as a source of silicic acid monomer (Si(OH)4) responsible for dipolymer formation, it is even more suitable. From these viewpoints, preferable examples of the compound of the alkali supply source include sodium silicate, sodium hydroxide, and the combined use of sodium silicate and sodium hydroxide. Also, it is possible to replace a part of the above sodium compound with the corresponding potassium compound as long as the economic efficiency (cost) in industrial implementation is not impaired. Based on the above, as the above alkali source, an aqueous solution of potassium hydroxide, sodium hydroxide, sodium silicate or potassium silicate is preferably used, and an aqueous solution of sodium silicate is particularly preferably used. The above aqueous solution of sodium silicate is what is commonly called "water glass", and commercially available products can be used. As the chemical composition, those containing SiO2 = 20 - 40% and Na2O = 5 - 20% are preferable.

[0040] The molar ratio of the amount of alkali to the amount of water (hereinafter referred to as the molar ratio) constituting the alkali source is desirably 0.1 or more. The higher the molar ratio within a reasonable range, the better the strength development of the obtained geopolimer cured body. Therefore, it is necessary to increase the amount of alkali added during mixing and reduce the amount of water. On the other hand, the lower the amount of water, the lower the fluidity, making it difficult to fill the mold. Therefore, the molar ratio is more preferably 0.15 or more. The concentration of the aqueous alkali solution used is preferably in the range of 20 to 60% by mass, for example, in the range of 40 to 55% by mass.

[0041] The production of the geopolimer composition used in the present invention is as follows, for example. First, prepare the active filler such as the aluminosilicate. When using a plurality of these as the active filler, mix them in advance. Add and mix the separately prepared alkali source to the active filler, and further add and mix the aggregate described later to produce the geopolimer composition.

[0042] As the aggregate, those generally used in ordinary concrete or mortar (fine aggregate, coarse aggregate, etc.) can be preferably used.

[0043] When adding an additive for geopolimer such as a viscosity reducer to the geopolimer composition, the additive may be added together when preparing the alkali source, or may be added after kneading the alkali source, active filler, and aggregate and uniformly mixed. The additive for geopolimer can be used either as an aqueous solution or as a solid. It is also possible to produce the geopolimer composition using a pre-mixed product of the active filler and the additive for geopolimer and / or an aqueous solution of the additive. In this way, the additive for geopolimer may be mixed with either the active filler or the alkali source, and then further mixed with the remaining materials used for the geopolimer, or may be added to the pre-mixed mixture of the active filler and the alkali source. The latter (addition to the mixture) is preferred. Also, as the addition method, the required addition amount may be added all at once, or the required addition amount may be added in portions.

[0044] Regarding the formulation design of geopolymers, the ratio ([alkali solution / B] × 100 (%)) of the total mass of the alkali solution (alkali source: for example, water glass + sodium hydroxide + water) to the total mass of the active filler (active filler powder (B)) can be appropriately set according to the strength required for the structure or product. Considering workability, it is preferably 40 to 65% by mass. In addition, the ratio of the components of the alkali solution, for example, the volume ratio represented by [water glass (WG)] / [sodium hydroxide (NaOH) or aqueous sodium hydroxide solution (NaOHaq)], can be appropriately set according to the target setting time and strength of the geopolymer (cured body). Preferably, it is in the range of 1.0 to 4.0. This ratio is also possible to set in terms of the mass ratio of water glass and aqueous sodium hydroxide solution. The blending ratio of the additive for geopolymers can vary depending on the composition of the geopolymer composition (materials used for geopolymers) (for example, the composition of active fillers such as aluminosilicates, etc.) and also depending on the type and composition of the additive. As an example, it can be blended at 0.1 to 10% by mass, for example, 0.5 to 5% by mass based on the mass of the active filler.

[0045] [Method for producing geopolymer cured body] The production method of the present invention is a method for producing a geopolymer cured body with an aqueous silicone dispersion interposed between a mold and a geopolymer composition, and is not particularly limited as long as it is a method using the above-mentioned specific aqueous silicone dispersion as the aqueous silicone dispersion. As an example of the above production method, a method can be adopted that includes a step (a) of applying an aqueous silicone dispersion to at least a part of the surface of the mold in contact with the geopolymer composition, and a step (b) of applying the geopolymer composition into the mold.

[0046] First, in step (a), the aqueous silicone dispersion is applied to at least a part of the surface in contact with the geopolimer composition of the mold. As an example of a suitable surface for applying the aqueous silicone dispersion, when it is a geopolimer cured body, a surface whose appearance state can be visually confirmed and evaluated can be mentioned. The method of applying the aqueous silicone dispersion is not particularly limited. For example, coating, spraying, etc. can be adopted, and a conventional method can also be used for the specific method. As the material of the mold used in the present invention, for example, rubber-based materials such as urethane rubber, silicone rubber, fluororubber, natural rubber, styrene-butadiene rubber; FRP-based materials such as polyester, epoxy resin; synthetic resin-based materials such as ABS copolymer, acrylic resin, vinyl chloride resin, polyethylene, polypropylene, polystyrene, fluororesin, etc. In addition to these single substances, those in which the above materials (rubber-based, FRP-based, synthetic resin-based) are coated on the surfaces of iron, aluminum, etc. can be used. Considering that if the application amount of the aqueous silicone dispersion is too small, sufficient curing cannot be obtained, and if it is too large, it may adversely affect the curing reaction of the cured body, for example, it is preferably 5 to 200 g / m 2 and more preferably 10 to 100 g / m 2 can be achieved.

[0047] Next, in step (b), the geopolimer composition is injected into the mold, or the geopolimer composition is applied or sprayed onto the surface inside the mold coated with the aqueous silicone dispersion, etc., to apply the geopolimer composition into the mold. Note that before the aqueous silicone dispersion applied in step (a) dries (that is, when the surface in contact with the geopolimer composition of the mold is in a wet state with the aqueous silicone dispersion), by applying the geopolimer composition into the mold, the effects of the present invention: there are no traces of ejection-like bubbles on the surface and the surface finish is excellent, and it is possible to prevent deterioration of the adhesion of the coating film during post-processing such as painting, etc., which is preferable because it leads to the realization of such effects.

[0048] After applying the geopolimer composition into the mold, the geopolimer composition can be cured to obtain a cured geopolimer. To cure the geopolimer composition, normal temperature may be used, but for example, it may be heated at 50 to 110 °C for 30 minutes to 8 hours to promote the curing reaction.

[0049] Further, using the obtained cured geopolimer as a surface layer, a laminate composed of multiple layers can be created. For example, it can be a reinforced cured geopolimer (laminate) including the cured geopolimer (surface layer) and another cured body (for example, a reinforcing layer, etc.). In this case, after the step (b) of applying the geopolimer composition into the mold, a step (c) of applying a curable material that constitutes another cured body into the mold can be included. Step (c) can be included immediately after step (b), or after curing the geopolimer composition to form a cured body, step (c) can be applied and laminated.

[0050] As the laminate composed of the above multiple layers, for example, it can be a laminate including the cured geopolimer (surface layer) and a reinforcing layer including a reinforcing material such as a fiber base material. As the reinforcing layer, for example, it can include a fiber base material such as a glass fiber base material and a geopolimer impregnated and cured in the fiber base material such as a glass fiber base material.

[0051] Hereinafter, as an example of the above laminate which is an aspect of the cured geopolimer, FIG. 1 shows a diagram for explaining a fiber-reinforced inorganic molded body. As shown in FIG. 1, the molded body 1 includes a surface layer 2 and a reinforcing layer 5 joined to the surface layer 2. The cured geopolimer according to the present invention can be adopted as the cured body 3 in the surface layer 2, and the effect of the present invention contributes to the characteristics of the surface layer 2. Note that the thickness of the molded body 1 can be appropriately set according to its use, etc. For example, from the viewpoint of improving the strength of the molded body, it can be 2.3 to 12 mm, and for example, 3.5 to 7.0 mm.

[0052] 〈Surface layer 2〉 The surface layer 2 contains, as a main component, a cured body 3 of geopolymers (GP). As described above, GP is a general term for amorphous polycondensates formed by the reaction of an active filler such as aluminosilicate and an alkali source, and is not a hydrate produced by reacting with water like cement. Since it has a strong inorganic polymer structure with no bond breakage even at high temperatures, it is resistant to deterioration factors such as wind, rain, sunlight, acid, and temperature changes. Examples of the active filler (not shown) include those described above, and in the application of fiber-reinforced inorganic molded bodies, metakaolin, which is white, has a fast reaction rate, and has little quality variation, can be preferably used. As the alkali source, an aqueous solution of an alkali silicate such as sodium silicate or potassium silicate described above is used. The surface layer 2 may contain, if necessary, reinforcing fibers (not shown) dispersed in GP to reinforce the surface layer 2. Any reinforcing fiber can be used according to the application of the molded body 1. From the viewpoints of the good appearance of the surface of the molded body 1 and the high reproducibility of the design when forming a design on the surface of the molded body 1, for example, reinforcing fibers such as vinylon, acrylic, PE, PP, cellulose, aramid, carbon fiber, alumina fiber, and glass fiber can be preferably used. From the viewpoint of durability, it is preferable that the surface layer 2 does not contain glass fibers such as E-glass that are vulnerable to alkali, but alkali-resistant glass fibers may be included as long as they do not affect the surface properties of the molded body 1. The content of these reinforcing fibers in the surface layer 2 can be, for example, 0.3 to 1.0% by mass of the total mass of the surface layer 2 from the viewpoints of strength improvement, good appearance of the surface of the molded body 1, and high reproducibility of the design when forming a design on the surface of the molded body 1. From the viewpoints of strength improvement and dispersibility of the reinforcing fibers, the fiber diameter of the reinforcing fibers can be, for example, 10 to 50 μm, and the fiber length can be, for example, 1 to 10 mm. The surface layer 2 may contain an aggregate 4 which is insoluble in water and does not react with alkali metal silicate as necessary to reinforce the surface layer 2. In particular, when forming a design on the surface of the molded body 1, it is preferable to contain the aggregate 4 from the viewpoints of preventing a decrease in strength and crack generation in fine unevenness. Examples of the aggregate 4 include wollastonite, zircon sand, silica sand, crystalline alumina, mica, copper, limestone, municipal solid waste slag, etc. These may be used alone or in combination of two or more. Among them, wollastonite can be used from the viewpoint of having a needle shape and an effect of preventing shrinkage. The particle size of the aggregate 4 can be, for example, 50 to 1000 μm, or for example, 50 to 200 μm from the viewpoints of good appearance and high reproducibility of the design. The content of the aggregate 4 in the surface layer 2 can be, for example, 10 to 50% by mass of the total mass of the surface layer 2 from the viewpoints of strength improvement, good appearance of the surface of the molded body 1, and high reproducibility of the design. In this specification, the "particle size" refers to the 50% (weight) cumulative particle size, that is, the particle size when 50% by weight of the entire aggregate is reached when accumulating from the smaller particle sizes. The preferable thickness of the surface layer 2 varies depending on the use of the molded body 1 and the presence or absence of design formation, etc. However, from the viewpoints of the strength and good appearance of the entire molded body, it can be, for example, 0.3 to 2.0 mm, or alternatively 0.5 to 1.0 mm. The surface of the surface layer 2, that is, the surface of the molded body 1 may be a plain and smooth surface as shown in Fig. 1(a), or a design may be formed as shown in Fig. 1(b). Examples of the design include various ones such as Japanese traditional patterns like tortoise shell, checkered pattern, and seven treasures connection, geometric patterns, leather texture pattern, rock texture, wood grain, wood texture (wood bark), combing, scraping off, and scratching.

[0053] 〈Reinforcing layer 5〉 The reinforcing layer 5 is joined to the surface layer 2 and includes a fiber base material 6 such as a glass fiber base material and a geopolimer (cured body of GP) 7 impregnated and cured in the fiber base material 6 such as a glass fiber base material. If a fiber base material 6 such as a glass fiber base material is used as the reinforcing material, the reinforcing layer 5 can be highly filled with a reinforcing material such as glass fiber. The cured body 7 of GP is a matrix material in the reinforcing layer 5 and is formed by the reaction of an alkali source (aqueous solution such as alkali metal silicate) and an active filler, similar to the cured body 3 of GP contained in the surface layer. The fiber base material constituting the reinforcing layer 5 may be a basalt fiber base material in addition to the glass fiber base material. Since basalt fiber is a fiber obtained by melting and spinning basalt, it is also called basalt fiber. Basalt fiber is known to have higher heat resistance and higher strength than glass fiber. Examples of the form of the fiber base material (glass fiber base material or basalt fiber base material) 6 include plain weave, twill weave, non-woven fabric, mat, knitted fabric, woven fabric, or a combination thereof, or a combination thereof with chopped, etc. From the viewpoint of highly filling the reinforcing layer 5 with glass fiber or basalt fiber, a non-woven fabric or a mat is preferable, and a mat is more preferable. Examples of the type of mat include a chopped strand mat in which glass fiber strands or basalt fiber strands cut to a predetermined length are dispersed in a random direction and laminated to a uniform thickness and formed into a mat shape with a binder, a stitch mat in which glass fiber strands or basalt fiber strands cut to a predetermined length are sewn with another continuous fiber into a sheet shape, or a continuous strand mat in which continuous fibers are stacked in a spiral shape, for example, and formed into a mat with a binder. A suitable basis weight of a single non-woven fabric or mat is, for example, 30 to 600 g / m from the viewpoint of compatibility between the impregnability of GP, the handleability of the mat itself, and the handleability of the polymer-containing fiber base material (polymer-containing glass fiber base material or polymer-containing basalt fiber base material) impregnated with the second geopolimer composition described later. 2It is as follows. The count of the glass fiber strands constituting the glass fiber base material can be, for example, 5 to 500 tex, and the fiber length can be, for example, 1 to 100 mm, or for example, 20 to 100 mm. The count of the basalt fiber strands constituting the basalt fiber base material can be, for example, 5 to 500 tex, and the fiber length can be, for example, 1 to 100 mm, or for example, 20 to 100 mm. Regarding the number of layers of the fiber base material (glass fiber base material or basalt fiber base material) 6 in the reinforcing layer 5, it can be appropriately selected according to the use of the molded body, for example, 1 to 10 layers, or for example, 3 to 5 layers. Also, the fiber base material (glass fiber base material or basalt fiber base material) 6 may be laminated into a base material state by spraying strands obtained by cutting rovings to, for example, 1 to 100 mm, or for example, 20 to 100 mm with a spray gun. From the viewpoint of improving strength, the content of the glass fiber base material in the reinforcing layer 5 can be, for example, 5 to 25% by mass, or for example, 5 to 20% by mass of the total mass of the reinforcing layer. Also, from the viewpoint of improving strength, the content of the basalt fiber base material in the reinforcing layer 5 can be, for example, 5 to 25% by mass, or for example, 5 to 20% by mass of the total mass of the reinforcing layer. The reinforcing layer 5 can contain, if necessary, an inorganic filler (not shown), for example, for weight adjustment. Examples of the inorganic filler include talc, fine wollastonite powder, silica powder, zeolite, calcium carbonate, aluminum hydroxide, barium sulfate, and other pulverized products of rocks. The particle size of the inorganic filler is not particularly limited as long as it does not prevent impregnation of the GP fiber base material (glass fiber base material or basalt fiber base material) 6, and is, for example, 5 μm or more and less than 50 μm. From the viewpoints of both improving strength and impregnability to the GP fiber base material (glass fiber base material or basalt fiber base material) 6, the content of the inorganic filler in the reinforcing layer 5 can be, for example, 50% by mass or less of the total mass of the reinforcing layer. The thickness of the reinforcing layer 5 varies depending on the use of the molded body 1 and the like, but from the viewpoint of improving the strength of the molded body, it can be, for example, 2.0 to 10 mm, or for example, 3.0 to 6.0 mm.

Examples

[0054] The present invention will be described by the following examples. However, the present invention is not limited by these examples and comparative examples in any way.

[0055] 〔Preparation of Aqueous Silicone Dispersion〕 Aqueous silicone dispersions of Examples 1 to 3 and Comparative Examples 1 to 2 were prepared with the compositions shown in Table 1. In the following description, the example numbers of the aqueous silicone dispersions will also be treated as the example numbers of the geopolymers molded using them and the example numbers of the evaluations of each test.

[0056] 95 parts of dimethylpolysiloxane (500Si or 1000Si) were placed in a 300 mL container, and 5 parts of hydrophobic silica (RX200) were added with stirring and dispersed uniformly to obtain a silicone oil compound. Separately, 50 parts of the obtained silicone oil compound, 50 parts of polyether-modified silicone (L053 / L060 = 50 / 50), 30 parts of sorbitan fatty acid ester (Surfactant 1), and 20 parts of nonionic surfactant <Surfactant 2> were placed in a 2 L container equipped with a thermometer and a stirrer, heated to 60 °C to 80 °C and dissolved, and then 850 parts of water were gradually added with stirring to perform emulsification, and cooled to 30 °C to obtain 1000 parts of an aqueous silicone dispersion with a solid content of 15%.

[0057] Each component used in the preparation of the aqueous silicone dispersion is as follows. 〈Silicone Oil Compound〉 · 500Si: Dimethylpolysiloxane (500 cSt) · 1000Si: Dimethylpolysiloxane (1000 cSt) · RX200: Hydrophobic silica (manufactured by Evonik (formerly Nippon Aerosil) Co., Ltd., AEROSIL (registered trademark) RX200) 〈PE-modified Si〉 · L053: Polyether-modified silicone (manufactured by Asahi Kasei Wacker Silicone Co., Ltd., WACKER (registered trademark) L 053) ·L060: Polyether-modified silicone (Asahi Kasei Wacker Silicone Co., Ltd., WACKER® L 060) 〈Surfactant 1 (surfactant with HLB of 1 or more and less than 10)〉 ·S-60: Sorbitan monostearate (HLB: 4.7) (manufactured by Toho Chemical Industry Co., Ltd., Solvon® S-60) ·S-80: Sorbitan monooleate (HLB: 4.3) (manufactured by Toho Chemical Industry Co., Ltd., Solvon® S-80) ·S-20: Sorbitan monolaurate (HLB: 8.6) (manufactured by Toho Chemical Industry Co., Ltd., Solvon® S-20) 〈Surfactant 2 (surfactant with HLB of 10 or more and 20 or less)〉 ·T-8500: Sorbitan trioleate 100EO (HLB: 16.4) (manufactured by Toho Chemical Industry Co., Ltd., Solvon® T-8500) ·O-60: Oleyl alcohol - 60EO (HLB: 18.3) (manufactured by Toho Chemical Industry Co., Ltd., Pegnol® O-60) ·TW-O106V: Polyoxyethylene (6) sorbitan monooleate (HLB: 10.0) (manufactured by Kao Corporation, Leodol® TW-O106V)

[0058] 〔Preparation of diolefin polymer composition〕 Metakaolin and potassium silicate aqueous solution were mixed at a ratio of 100:100 (100:45.4 in terms of solid content) to prepare a diolefin polymer mortar for the strengthening layer (the second GP composition). Separately, metakaolin, potassium silicate aqueous solution, and wollastonite (aggregate) were mixed at a ratio of 100:90:30 (100:40.9:30 in terms of solid content) to prepare a diolefin polymer mortar for the surface layer (the first GP composition).

[0059] The details of each component used in the preparation of the diolefin polymer mortar are as follows. ·Metakaolin (manufactured by Sobekure Co., Ltd.) · Aqueous potassium silicate solution (manufactured by Osaka Silicate Co., Ltd., 1.4 50° (molar ratio 1.4, solid content 45.4 mass%)) · Wollastonite (NYAD-G manufactured by IMERYS)

[0060] [Production of Geopolymer Cured Body] The cured bodies of Examples 1 to 3 and Comparative Examples 1 to 2 were prepared by the hand lay-up method as follows. First, a wax-based release agent was applied to a plain urethane rubber mold, and the release agent was dried. Next, the aqueous silicone dispersions of Examples 1 to 3 or Comparative Examples 1 to 2 diluted 10-fold with water were sprayed onto the urethane rubber mold at 10 g / m 2 , and then the above-mentioned first GP composition was applied. A glass chopped strand mat (manufactured by Nitto Boseki Co., Ltd., basis weight 450 g / m 2 ) was placed on the applied first GP composition. Next, the above-mentioned second GP composition was applied so as to be kneaded into the mat, and impregnated while removing the air in the mat to obtain a polymer-containing glass fiber base material. The application of the first GP composition, the placement of the glass chopped strand mat, and the impregnation of the second GP composition were repeated twice in total. The obtained laminated structure was cured in an atmosphere at 60°C for 24 hours to completely cure the GP. Then, it was demolded from the urethane rubber mold to obtain a cured body, which was subjected to the surface appearance evaluation described below. Also, a cured body obtained in the same procedure as above except that the first GP composition was applied without applying the aqueous silicone dispersion after applying and drying the release agent to the urethane rubber mold was used as Reference Example 1, and a cured body obtained in the same procedure as above except that water was applied instead of the aqueous silicone dispersion was used as Reference Example 2, and these were also subjected to the surface appearance evaluation described below in the same manner.

[0061] [Surface Appearance Evaluation] In the cured body, the released surface (cured body surface) from the urethane rubber mold was visually observed as follows and subjected to the surface appearance evaluation. 1) Measurement of the number of bubbles The number of bubbles formed on the surface of the hardened body (15 cm × 10 cm) was counted visually by size. Bubbles with a size (maximum diameter) of 1 mm or more were defined as large bubbles, and those less than 1 mm were defined as small bubbles. The obtained results are shown in Table 1. 2) Edge peeling The surface of the hardened body (15 cm × 10 cm) was visually observed, and edge peeling was evaluated according to the following evaluation criteria. The obtained results are shown in Table 1. 〈Evaluation criteria〉 Large Peeling was observed in the surface layer up to about 10 mm from the edge. Small Peeling was observed in the surface layer 5 mm or less from the edge. None Peeling was not visually observed from the edge.

[0062]

Table 1

[0063] As shown in Table 1, Examples 1 to 3 had few bubbles and almost no edge peeling. On the other hand, in Comparative Examples 1 and 2, although the number of bubbles was kept low, edge peeling of up to about 10 mm was confirmed. Also, in Reference Example 1 without using the aqueous silicone dispersion and Reference Example 2 using water instead of the aqueous silicone dispersion, a large number of bubbles were observed, and edge peeling of up to about 10 mm was also confirmed.

Claims

1. A method for producing a geopolimer cured body by interposing an aqueous silicone dispersion between a forming mold and a geopolimer composition, wherein the aqueous silicone dispersion is a dispersion in which a dispersion medium containing a sorbitan fatty acid ester having an HLB of 2 or more and 6 or less and a nonionic surfactant having an HLB of 15 or more and 19 or less contains a silicone oil compound and a polyether-modified silicone dispersed therein. A method for producing a geopolimer cured body.

2. A step of applying an aqueous silicone dispersion to at least a part of the surface of the forming mold in contact with the geopolimer composition, and a step of applying a geopolimer composition into the forming mold. The method for producing a geopolimer cured body according to claim 1.

3. After the step of applying the geopolimer composition, further including a step of applying a curable material into the forming mold. The method for producing a geopolimer cured body according to claim 2.

4. The method for producing a geopolimer cured body according to any one of claims 1 to 3, wherein the sorbitan fatty acid ester having an HLB of 2 or more and 6 or less is sorbitan monostearate.

5. The nonionic surfactant having an HLB of 15 or more and 19 or less is one or more selected from polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, polyoxyalkylene alkyl aryl ethers, polyoxyalkylene aralkyl aryl ethers, and polyoxyalkylene polyhydric alcohol fatty acid esters. The method for producing a geopolimer cured body according to any one of claims 1 to 3.

6. The silicone oil compound is composed of silicone oil (a) and fine powder silica (b), and the silicone oil (a) is dimethylpolysiloxane. The method for producing a geopolimer cured body according to any one of claims 1 to 3.

7. An aqueous silicone dispersion in which a dispersion medium containing a sorbitan fatty acid ester having an HLB of 2 or more and 6 or less and a nonionic surfactant having an HLB of 15 or more and 19 or less contains a silicone oil compound and a polyether-modified silicone dispersed therein. A mold wetting agent for producing a geopolimer cured body.

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