JPH07309681A - Effervescent inorganic composition - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to provide a foamable inorganic composition which has a short curing time, retains a foaming suitable viscosity, and can obtain a foamed cured product having a low density. [Structure] 8 fly ash powders with a particle size of 10 μm or less
Inorganic powder 97 to 50 consisting of at least one selected inorganic powder such as inorganic powder obtained by melting 0% by weight or more of inorganic powder, fly ash or clay and spraying in gas % By weight, alumina cement,
100 parts by weight of inorganic powder consisting of 3 to 50% by weight of at least one aluminum-based additive selected from the group consisting of γ-alumina, sprayed alumina, sodium aluminate, and aluminum hydroxide, alkali metal silicic acid 0.2 to 450 parts by weight of salt, 1 to 15 parts by weight of calcium oxide, 0.01 to 10 parts by weight of foaming agent, and 35 to 150 parts of water.
It was configured to include 0 part by weight.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a foamable inorganic composition.

[0002]

2. Description of the Related Art Conventionally, as a foamable inorganic composition capable of being foamed and cured by heat in the presence of an alkali to obtain an inorganic foam useful as a lightweight construction material, for example, a water-soluble alkali silicate, a corundum furnace. The main component composed of dust and filler and a foaming agent such as hydrogen peroxide are mixed with a predetermined amount of calcium oxide as a curing accelerator, and the mixture is cured to obtain a foamable inorganic composition (Japanese Patent Laid-Open No. Hei 4- 285
No. 080) has already been proposed.

[0003]

However, although the foamable inorganic composition has calcium oxide added to accelerate the hardening, the amount of calcium oxide added is increased in an attempt to harden it in a short time. Then, a rapid heat generation occurs and the viscosity of the foamable inorganic composition rapidly increases, so that the composition cannot be sufficiently mixed, or the viscosity rapidly increases and the expansion ratio does not increase and the low-density inorganic foaming occurs. There were problems such as not being able to get a body.

The present invention provides a foamable inorganic composition which improves the conventional problems as described above, has a short curing time, retains a foaming suitable viscosity, and can obtain a foamed cured product having a low density. It is an object.

[0005]

In order to achieve such an object, an expandable inorganic composition according to the present invention comprises an inorganic powder containing 80% by weight or more of fly ash powder having a particle size of 10 μm or less, 50% by weight or more of powder obtained by melting fly ash and spraying it in gas, inorganic powder obtained by melting clay made of silica-alumina-based powder and spraying in gas, and silica-alumina-based powder Inorganic powder obtained by applying mechanical energy of 0.5 to 30 kwh / kg to the contained powder, and further 100 to 100% of the powder.
From inorganic powder obtained by heating to 750 ° C., inorganic powder obtained by applying mechanical energy of 0.1 to 30 kwh / kg to metakaolin obtained by heating and dehydrating kaolin mineral at 500 to 900 ° C. 97-50% by weight of at least one inorganic powder selected from the group consisting of, and at least one aluminum selected from the group consisting of alumina cement, γ-alumina, sprayed alumina, sodium aluminate, and aluminum hydroxide. System additive 3-5
100 parts by weight of inorganic powder consisting of 0% by weight, 0.2 to 450 parts by weight of alkali metal silicate, 1 to 15 parts by weight of calcium oxide, 0.01 to 10 parts by weight of foaming agent, 35 parts of water. -1500 parts by weight.

In the above structure, the fly ash is
Fine ash particles collected by a dust collector from a pulverized coal combustion boiler specified by JIS A 6201. Silica 45% or more, moisture content 1% or less, ignition loss 5% or less, specific gravity 1.95 or more. , Specific surface area 2700 cm ² / g or more, 44μ
75% or more passes through the m standard sieve. As a method for obtaining an inorganic powder containing 80% by weight or more of fly ash powder having a particle size of 10 μm or less from the fly ash, any conventionally known method, for example, classification by a sieve, specific gravity, wind force, wet settling, jet, etc. A method of pulverizing with a mill, a roll mill, a ball mill or the like can be mentioned. Moreover, these means may be used in combination.

The amount of fly ash powder having a particle size of 10 μm or less is limited to 80% by weight or more because the reactivity with the alkali metal silicate (B) decreases as the amount decreases. The fly ash may be calcined if necessary.
If the firing temperature is low, the black color of fly ash remains, making it difficult to color the resulting inorganic foam, and if the firing temperature is high, the reactivity with the alkali metal silicate (B) may be low. It is preferable to set the temperature to about 1000 ° C.

As a method of melting fly ash or clay and spraying it into a gas, a thermal spraying technique applied to ceramic coating can be applied. In this thermal spraying technique, the material powder is melted at a temperature of 2000-16000 ° C.
Those sprayed at a speed of up to 800 m / sec are preferable, and examples of such a spraying technique include a plasma spraying method, a high energy gas spraying method, an arc spraying method and the like.
Resulting powder preferably has a specific surface area of 0.1 to 100 m ² / g, more preferably those having a specific surface area 0.1~60m ² / g.

To apply mechanical energy to clay means to apply a compressive force, a shearing force, an impact force, etc. These may be used alone or in combination of two or more kinds. Is also good. Examples of the device for applying such mechanical energy include a ball mill, a vibration mill, a planetary mill, a medium agitating mill, a roller mill, a mortar, and a het pulverizer.

When the amount of mechanical energy is small, the reactivity with the alkali metal silicate is low, and when it is large, the load on the apparatus such as a crusher is large and the abrasion of the apparatus is increased.
Since problems such as mixing of impurities into the inorganic powder occur,
It is limited to 0.1 to 30 kwh / kg, preferably 1.
It is 0 to 26 kwh / kg. When mechanical energy is applied, a grinding aid may be added if necessary.

The grinding aid is a material which prevents the powder from adhering to inside of the apparatus and remarkably agglomerating when mechanical energy is applied. For example, alcohol such as methyl alcohol and ethyl alcohol, alcohol amine such as triethanolamine, etc. , Metal stearate such as sodium stearate and calcium stearate, and acetone. These may be used alone or in combination of two or more.

The method of further heating the powder obtained by applying mechanical energy to the clay is not particularly limited, and a conventionally known heating device such as a hot air dryer or a rotary kiln can be used. When the heating temperature is low, the effect of increasing the strength of the obtained foamed cured product is poor, and when it is high, the crystallization of the inorganic powder is promoted.
The temperature is limited to 0 ° C, preferably 200 to 600 ° C.
Further, if the heating time is short, the effect of increasing the strength of the foamed cured product is poor, and if it is long, the energy cost may increase, so 1 minute to 5 hours is preferable.

As the above-mentioned clay, SiO is used as a chemical component.
₂ 5 to 85 wt%, those containing Al ₂ O ₃ 90 to 10% by weight. Examples of such clay include kaolin minerals (kaolinite, dickanite, nacrite,
Halloysite, etc., mica clay minerals (muscovite, illite,
Phengite, sea curb, celadonite, paragonite, brammalite, etc.), smectite (montmorillonite, pidate, nontrolite, savonite, sauconite, etc.), chlorite, pyrophyllite, talc, permiculite, pyrophyllite, granite shale, etc. However, the present invention is not limited to these as long as the composition, particle size and the like are appropriate.

The above-mentioned alumina cement means an inorganic powder containing Al ₂ O _{3 in an amount} of 30% by weight or more and CaO in an amount of 50% by weight or less, and containing lime aluminate as a main component.
All varieties listed in JISR 2511 can be used. The γ-alumina is bauxite,
It refers to a powder having crystallinity lower than that of α-alumina, which is obtained by heating and dehydrating aluminum hydroxide or the like at several hundred degrees.

The above-mentioned sprayed alumina means high temperature spraying method.
Obtained by Al₂O₃70% by weight or more
Powder. As the above sodium aluminate,
Sodium Taaluminate (NaAlO ₂) Is preferred.
If the average particle size of the aluminum-based additive is large,
Since the result may not be achieved, 300 μm or less is preferable.
Yes.

In the above-mentioned inorganic powder, the amount of the aluminum-based additive compounded is limited to 3 to 50% by weight, because if it is too small, curing failure will occur, and if it is too large, the strength of the foamed cured product will decrease. It is preferably about 40 to 40% by weight, particularly preferably about 7 to 25% by weight. The alkali metal silicate (B) is represented by M ₂ O · nSiO ₂ (M = Li, K, Na or a mixture thereof), and n is 0.05.
-8 is preferable, n is more preferably 0.1-3, and n is most preferably 0.5-2.5. That is, when n exceeds 8, the aqueous solution of alkali metal silicate is apt to gel, and the viscosity rapidly increases, which may make it difficult to mix with the powder.

The alkali metal silicate is preferably added and mixed in the form of an aqueous solution. When the alkali metal silicate is used as an aqueous solution as described above, the concentration of the aqueous solution is not particularly limited, but if it is thick, a viscosity suitable for foaming cannot be obtained, and if it is thin, water becomes excessive and curing shrinkage becomes large. Since it causes a decrease in strength, 10 to 60% by weight is preferable.

The amount of alkali metal silicate added must be 0.2 to 450 parts by weight with respect to 100 parts by weight of the inorganic powder. And, it is preferably 10 to 350 parts by weight, more preferably 20 to 250 parts by weight. That is,
If the amount of the alkali metal silicate added is less than 0.2 parts by weight, the amount of alkali necessary for the reaction is too small, resulting in poor curing. Conversely, if it exceeds 450 parts by weight,
Since the amount of the curing agent is large, there is a problem in the water resistance of the foamed and cured product obtained.

The calcium oxide used in the present invention is generally called quicklime, and is preferably in powder form. The particle size of calcium oxide is preferably 0.1 to 200 μm. That is, 20
If it exceeds 0 μm, sufficient heat generation does not occur and 0.1 μm
If it is below the range, heat will be rapidly generated, the viscosity will increase, and the composition will not be sufficiently mixed, or the viscosity will increase and the expansion ratio will not increase, and a low-density foam may not be obtained.

The amount of calcium oxide added is 10
0 to 15 parts by weight, preferably 4 to
12 parts by weight, more preferably 6 to 10 parts by weight. That is, when the amount of calcium oxide added is less than 1 part by weight, the effect of accelerating the curing is lost, and when it exceeds 15 parts by weight, heat is abruptly generated, the viscosity is increased, and the composition cannot be sufficiently mixed. Alternatively, the viscosity increases, the expansion ratio does not increase, and a low-density foamed cured product cannot be obtained.

The foaming agent is not particularly limited, but examples thereof include peroxides such as hydrogen peroxide, sodium peroxide, potassium peroxide, sodium perborate, Mg, Ca,
Cr, Mn, Fe, Co, Ni, Cu, Zn, Al, G
Examples thereof include metal powders such as a, Sn, Si and ferrosilicon. And of these, cost, safety,
Hydrogen peroxide and aluminum powder are preferable in view of easy availability and mixing.

The amount of the foaming agent added is determined by the density of the foam to be obtained, but is 0.01 to 10 parts by weight with respect to 100 parts by weight of the inorganic powder. That is, when the amount of the foaming agent added exceeds 10 parts by weight, the foaming gas becomes excessive and the bubbles are broken, and when it is less than 0.01 parts by weight, the expansion ratio is too small and the meaning of the foamed and cured product is lost. When hydrogen peroxide is used as a foaming agent, it is preferable to use it as an aqueous solution. When hydrogen peroxide is used as an aqueous solution, the concentration of the aqueous solution is preferably 0.5 to 35%, more preferably 1 to 25%, even more preferably 5 to 15%. That is,
If the concentration of the aqueous solution is too high, foaming will be too fast and stable foaming may not be possible, which is dangerous. On the other hand, if the concentration of the aqueous solution is too thin, the amount of water will be too large relative to the amount of hydrogen peroxide, and the viscosity will decrease, and foaming may become unstable.

When a metal powder is used as the foaming agent, the average particle size is preferably 1 to 200 μm. That is, if the particle size is too large, the reactivity decreases,
If the particle size is too small, the dispersibility may decrease, and the reactivity may increase and the foaming may become too fast. Further, also in the case of metal powder, it is preferable to mix with other components in a state of being dispersed in water.

The total amount of water added is 35 to 1500 parts by weight based on 100 parts by weight of the inorganic powder, but 45 to 10 parts by weight.
0 parts by weight is preferable, and 50 to 500 parts by weight is more preferable. That is, if the amount of water added is too large, the amount of water will increase with respect to the entire composition, causing a decrease in strength and a decrease in viscosity, resulting in unstable foaming. On the other hand, if the amount of water added is too small, the viscosity will be too high to stabilize the foam, or a high-density low-density foamed cured product will not be obtained.

In the composition of the present invention, an inorganic filler, a reinforcing fiber, a foaming aid, an organic foam or an inorganic foam may be added, if necessary, in addition to the above composition. The inorganic filler can reduce shrinkage at the time of curing, improve the fluidity of the slurry, densify the cells, stabilize the bubbles, and the like. For example, silica sand, silica stone powder, fly ash,
Slag, silica fume, mica, talc, wollastonite, calcium carbonate, aerosil, silica gel, zeolite, activated carbon, alumina gel and the like can be preferably used.

The average particle size of the inorganic filler is 0.0
It is preferably 1 μm or more and 1 mm or less. That is, if the particle size is too large, it becomes difficult to stabilize the foaming, while if it is too small, the viscosity of the composition increases due to an increase in the amount of adsorbed water, which may reduce workability or may cause insufficient foaming. The amount of the inorganic filler added is 20 with respect to 100 parts by weight of the inorganic powder.
˜600 parts by weight is preferable, and 40 to 400 parts by weight is more preferable.

If the amount of the inorganic filler added is too large, the strength may be reduced. The reinforcing fiber can improve the strength of the obtained foamed cured product and prevent cracks. For example, vinylon, polypropylene, aramid, acrylic,
Synthetic fibers such as rayon, inorganic fibers such as carbon glass, potassium titanate, alumina, steel and slag wool can be preferably used.

The fiber length of the reinforcing fiber is preferably 1 to 15 mm. The fiber diameter is preferably 1 to 500 μm. That is, when the reinforcing fiber is too long, the dispersibility is lowered, when it is too thin, it is re-aggregated during mixing to form a fiber ball and the strength is not improved, and when it is short or thick, the reinforcing effect may be reduced.

The amount of reinforcing fiber added is 10
It is preferably 10 parts by weight or less with respect to 0 parts by weight. That is, if the amount is too large, the dispersibility of the fibers may be lowered.
The foaming aid can stabilize foaming. For example, porous powders such as silica gel, zeolite, activated carbon and alumina gel, metal stearates such as zinc stearate, calcium stearate and aluminum stearate, and palmitin. Surfactants such as acid metal salts (metal soap)
And the like can be preferably used.

The amount of the foaming aid added is preferably 5 parts by weight or less with respect to 100 parts by weight of the inorganic powder. That is, if the amount of the foaming aid added is too large, there is a possibility that the foaming may occur and the foaming may be adversely affected. In particular, when a surfactant such as a fatty acid metal salt is used as a foaming aid, its addition amount is preferably 0.05 to 5 parts by weight, and 0.3 to 3.0 parts by weight based on 100 parts by weight of the inorganic powder. More preferably parts by weight. That is, if the amount of the surfactant added is too large, the viscosity increases, which adversely affects the foaming, and if it is too small, the foam may be broken and the foaming may not be stable.

The organic foam and the inorganic foam can further reduce the weight of the foamed and hardened material.
Examples of organic foams include granular foams of synthetic resins such as vinyl chloride, phenol, urea, styrene, urethane and ethylene, and examples of inorganic foams include glass balloons, shirasu balloons, fly ash balloons, silica balloons, perlite. , Leucite, granular expanded silica and the like.

The organic and inorganic foams preferably have a specific gravity of 0.01 to 1, and a specific gravity of 0.
Those of 03 to 0.7 are more preferable. That is, when the specific gravity is less than 0.01, the mechanical strength of the molded product is lowered, and when it exceeds 1, the effect of weight reduction may not be obtained. The above foams may be used alone or in combination of two or more.

The amount of the above-mentioned foam added is preferably 10 to 100 parts by weight, more preferably 30 to 80 parts by weight, based on 100 parts by weight of the inorganic powder. That is, if the amount of foam added is less than 10 parts by weight, the effect of weight reduction cannot be obtained, and 1
If it exceeds 100 parts by weight, the mechanical strength may decrease. In order to obtain a foamed cured product from the composition of the present invention, first, the alkali metal silicate is dissolved in an appropriate amount of water, and 97 to 50 wt% of the inorganic powder and alumina cement, γ-alumina, sprayed alumina, Sodium aluminate,
An inorganic powder consisting of 3 to 50% by weight of one or more aluminum-based additives selected from the group consisting of and a foaming aid, a filler, and a reinforcing fiber, if necessary, are mixed and dissolved or dispersed in a predetermined amount of water. After adding and mixing the foaming agent, a method of foaming into a desired shape and shaping by a conventionally known method such as casting, press molding, extrusion molding, and curing can be used.

The curing temperature may be room temperature, but may be 50 to 100.
The curing reaction can be promoted and the mechanical properties can be improved by curing at a temperature of ° C.

[0035]

According to the above construction, a foaming cured product with a low density can be obtained while the curing time is short but the foaming suitable viscosity is maintained.

[0036]

EXAMPLES Examples of the present invention will be described in detail below. (Examples 1 to 20, Comparative Examples 1 to 10) Inorganic powder 1 and inorganic powder 2 are contained at the ratios shown in Tables 1 to 3 and Tables 6 and 7, and the aluminum-based additives A to E. 100 parts by weight of the raw material powder mixed with any of the aluminum-based additives selected from the group consisting of
Aqueous sodium silicate solution, talc, mica, polypropylene fiber, and zinc stearate are added in the amounts shown in Tables 1 to 3 and Tables 6 and 7, respectively, and mixed and stirred with a hand kisser to obtain a uniform paste. Then add this paste to Table 1
~ 3 and a predetermined amount of the foaming agent a or b shown in Tables 6 and 7 dispersed or dissolved in a predetermined amount of water are further added and mixed for about 10 seconds, and the mixture is poured into a container and allowed to stand. Then, foaming gradually occurred, and foaming was completed in about 3 minutes after mixing and stirring. Then, it was cured by curing at 85 ° C. for 2 hours and 20 hours to obtain foamed cured products.

The cured state and the foamed state of the foam after 2 hours of curing and 20 hours of curing were visually observed, and the obtained foam was demolded in a diphosphorus pentoxide desiccator. After drying, the density and compressive strength were measured, and the results are shown in Tables 1 to 3 and Tables 6 and 7.

(Examples 21 to 30, Comparative Examples 11 to 40)
Calcium oxide and silicic acid were added to 100 parts by weight of inorganic powder in which any one of the inorganic powders 3 to 7 and the aluminum-based additive A were mixed at the ratios shown in Tables 4 and 5 and Tables 8 to 12. Aqueous sodium solution, talc, mica, polypropylene fiber, zinc stearate are shown in Tables 4 and 5, respectively.
And the amounts shown in Tables 8 to 12 are added, and mixed and stirred with a hand mixer to obtain a uniform paste. Next, a paste obtained by dispersing or dissolving a predetermined amount of the foaming agent A or B in a predetermined amount of water in Tables 4, 5 and 8 to 12 was further added to this paste, mixed for about 10 seconds, and the mixture was poured into a container. When left standing, foaming gradually occurred, and foaming was completed in about 3 minutes after mixing and stirring. Then, it was cured by curing at 85 ° C. for 1 hour and 20 hours to obtain foams.

The cured state and foam state of the foam after 1 hour curing and 20 hours curing were visually observed, and the obtained foam was demolded in a diphosphorus pentoxide desiccator. After drying, the density and compressive strength were measured, and the results are shown in Tables 4 and 5 and Tables 8 to 12. In addition, the said Examples 1-30 and the comparative example 1
Inorganic powders 1 to 7, aluminum-based additives A to F, calcium oxide, sodium silicate aqueous solution,
Talc, mica, polypropylene fiber, and foaming agents A and B are as follows.

[Inorganic powder 1] A fly ash (manufactured by Kandenko Kako Co., Ltd., average particle size 20 μm: conforming to JIS A 6201) was used as a classifier (manufactured by Nisshin Engineering Co., Ltd., model: TC).
-15) classify and powder 1 with a particle size of 10 μm or less
Inorganic powder 1 was the one containing 100% by weight.

[Inorganic powder 2] The fly ash used in the above-mentioned inorganic powder 1 was classified by a classifier (manufactured by Nisshin Engineering Co., Ltd., model: TC-15) in the same manner as the inorganic powder 1, and the particle size was determined. The powder containing 100% by weight of powder having a particle size of more than 10 μm was designated as inorganic powder 2. [Preparation of Inorganic Powder 3] A powder obtained by melting fly ash at 3000 ° C. and atomizing it into the atmosphere at a speed of 80 m / s was used as an inorganic powder 3. The obtained inorganic powder 3 had an average particle size of 5 μm and a specific surface area of 9.5 m ² / g.

[Preparation of Inorganic Powder 4] Silica-Alumina System
Kaolin powder (composition: SiO₂45.7%, Al
₂O ₃38.3% Average particle size: 8 μm BET specific surface area
5.8m²/ G of raw material powder), combustion temperature 2500 ° C, injection
Inorganic powder collected by spraying at a particle velocity of 50 m / sec
The body (active inorganic powder) 4 was used. In addition, the obtained inorganic
The composition of the powder 4 is SiO₂49.7%, Al₂O₃Four
7.0%, average particle size 14.8 μm, BET specific surface area
It was 1.96 m @ 2 / g.

[Preparation of Inorganic Powder 5] Kaolin (composition:
SiO ₂ 45.7% Al ₂ O ₃ 38.3% Average particle size: 8 μm BET specific surface area 5.8 m ² / g) 100 parts by weight, triethanolamine 25% by weight and ethanol 7
Ultrafine mill AT-20 (manufactured by Mitsubishi Heavy Industries, Ltd., zirconia ball 1) was mixed with 0.5 part by weight of a mixed solution of 5% by weight.
0 mm used, ball filling rate 85% by volume), 25
A mechanical energy of kwh / kg was applied to obtain an inorganic powder 5. The mechanical energy applied was represented by the electric power supplied to the ball mill per unit weight of the treated powder.

[Preparation of Inorganic Powder 6] Inorganic Powder 5
Was heated at 300 ° C. for 3 hours to obtain an inorganic powder 6. [Preparation of Inorganic Powder 7] Metakaolin (SATINONE SP 33 manufactured by Engelhard Co., average particle size 3.
100 parts by weight of 3 μm specific surface area 13.9 m ² / g) and 0.5 parts by weight of a mixed solution of 25% by weight of triethanolamine and 75% by weight of ethanol were added to Ultrafine Mumi AT.
-20 (manufactured by Mitsubishi Heavy Industries, using zirconia balls 10 mm, ball filling rate 85% by volume) and supplied to 10 kwh /
By applying mechanical energy of kg, an inorganic powder 7 was obtained. The mechanical energy applied was expressed by the electric power supplied to the ball mill per unit weight of the treated powder.

[Aluminum-based additive A] Alumina cement containing 56% by weight of Al ₂ O _{3 and} 36% by weight of CaO (trade name: Asahi Alumina Cement 1 manufactured by Asahi Glass Co., Ltd.)
No.) [Aluminum-based additive B] Alumina cement containing 40% by weight of Al ₂ O ₃ and 38% by weight of CaO (Asahi Fonju manufactured by Asahi Glass Co., Ltd.) [Aluminum-based additive C] γ-alumina (trade name of Sumitomo Chemical Co., Ltd.) : Activated alumina) [Aluminum-based additive D] Thermal-sprayed alumina (manufactured by Micron, trade name: Harimic) [Aluminum-based additive E] Sodium metaaluminate (manufactured by Hokuriku Kasei Co., Ltd .: trade name: Kitakreet # 10) [Aluminum System additive E] Aluminum hydroxide (Sumitomo Chemical Co., Ltd. product name: C30
1) [Calcium oxide] An average particle size of 30 μm manufactured by Calceed Co.

[Sodium silicate aqueous solution] SiO 2 in molar ratio
₂ : Na ₂ O = 1.5: 1 60 parts by weight of sodium silicate dissolved in 80 parts by weight of water. [Talc] Talc 83 manufactured by Sanyo Clay Industry Co., Ltd. having an average particle size of 5 μm.

[Mica] Suzolite Mica 325S
An average particle size of 40 μm. [Polypropylene fiber] PZL thickness 2 made by Daiwa Spinning Co., Ltd.
Denier, 6 mm long. [Foaming agent a] 35% by weight hydrogen peroxide solution manufactured by Mitsubishi Gas Chemical Co., Inc. diluted with water so that the hydrogen peroxide concentration becomes 10% by weight.

[Foaming agent b] Aluminum powder manufactured by Toyo Aluminum Co., Ltd., having an average particle size of 40 μm, dispersed and mixed in water to a concentration of 10% by weight. Moreover, the method for evaluating the cured state and the state of cells, and the method for measuring the density and compressive strength of the foam are as follows.

[Evaluation of Cured State] The cured state and the obtained foam were visually observed at the time of aging curing for 1 hour, 2 hours and 20 hours, and “cured” and cured for those sufficiently cured. Those that would be destroyed at the time of demolding were marked as "uncured". [Evaluation of bubble state] Visual observation of the obtained foam, "good" when the bubbles are well dispersed, "broken" when the bubbles are broken, and poorly foamed Was described as "insufficient foaming".

[Density] The obtained foam was treated with 50 × 50 × 5.
It was cut to 0 mm, weighed and divided by volume. [Compressive Strength] The obtained foam was cut into 50 × 50 × 50 mm, and according to JIS A 1108, 23 ° C., 50%
The compressive strength was measured by RH.

[0051]

[Table 1]

[0052]

[Table 2]

[0053]

[Table 3]

[0054]

[Table 4]

[0055]

[Table 5]

[0056]

[Table 6]

[0057]

[Table 7]

[0058]

[Table 8]

[0059]

[Table 9]

[0060]

[Table 10]

[0061]

[Table 11]

[0062]

[Table 12]

[0063]

The foamable inorganic composition according to the present invention comprises:
Since it is configured as described above, it is possible to obtain a foamed cured product which is cured in a short time and has low density and high strength. That is, it is possible to produce a foam-cured material useful as a building material and the like in a short time, reduce the manufacturing cost of the building material and the like, and improve the strength of the foam-cured material. Also spreads.

Claims (1)

[Claims] 1. An inorganic powder containing 80% by weight or more of fly ash powder having a particle size of 10 μm or less, a powder obtained by melting fly ash and spraying it into a gas, and a clay composed of silica-alumina powder. Inorganic powder obtained by melting and spraying in gas, and inorganic powder obtained by applying mechanical energy of 0.5 to 30 kwh / kg to powder containing 50% by weight or more of silica-alumina powder 0.1 to 30 kwh / kg of mechanical energy is applied to the inorganic powder obtained by heating the powder to 100 to 750 ° C. and the metakaolin obtained by heating and dehydrating kaolin mineral at 500 to 900 ° C. At least one kind of inorganic powder 97 to 5 selected from the group consisting of
Inorganic powder consisting of 0% by weight and 3 to 50% by weight of at least one aluminum additive selected from the group consisting of alumina cement, γ-alumina, sprayed alumina, sodium aluminate and aluminum hydroxide. To 100
Parts by weight, 0.2 to 450 parts by weight of alkali metal silicate,
Calcium oxide 1 to 15 parts by weight, foaming agent 0.01 to
A foamable inorganic composition containing 10 parts by weight and 35 to 1500 parts by weight of water.