JPH07165455A - Curable inorganic composition - Google Patents

Abstract

PURPOSE:To obtain a curable inorganic composition having high strength and excellent durability such as heat-resistance and weather resistance in a short time by compounding prescribed reactive inorganic powder with an alkali metal silicate and water. CONSTITUTION:This curable inorganic composition is produced by compounding (A) 100 pts.wt. of reactive inorganic powder obtained by compounding (a) 20-99.5wt.% of one or more kinds of inorganic powder selected from fly ash containing >=80wt.% of powder having particle diameter of <=20mum, fly ash baked at 400-1000 deg.C and containing >=80wt.% of powder having particle diameter of <=20mum and inorganic powder produced by applying mechanical energy of 0.1-30Kwh/kg to clay with (b) 0.5-80wt.% of one or more kinds of alumina powder selected from alumina cement powder, gamma-alumina powder and alumina powder produced by flame-spraying with (B) 1-300 pts.wt. of an alkali metal silicate and (C) 10-1,000 pts.wt. of water.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Heretofore, there have been proposed some inorganic compositions which are cured by heat in the presence of an alkali.
For example, in Japanese Unexamined Patent Publication (Kokai) No. 4-59648, an aqueous solution of an alkali metal silicate, ash of a dust collector generated during the production of metakaolin, corundum or mullite, an inorganic solid component such as fly ash, a filler, and an organic bentonite are used. The following composition for molded articles is described. Further, Japanese Patent Application Laid-Open No. 4-6138 describes a molded product obtained by kneading an alkali metal silicate aqueous solution, the above-mentioned solid component and a filler and then injecting the mixture into a mold and curing the mixture by heating.

However, among the inorganic solid components shown above, fly ash (JIS A 6201) and the like, which are industrial wastes and are required to be effectively used, have low reactivity with alkali and are suitable for building materials. Was difficult to obtain. In addition, these cured products have strength,
Not only durability, but also productivity and heat shrinkage at high temperature were problems.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, can significantly shorten the curing time, has high strength, and obtains an inorganic cured product having excellent heat resistance and weather resistance. It is to provide a curable inorganic composition that can be obtained.

[0005]

The present invention comprises 100 parts by weight of a reactive inorganic powder, 1 to 300 parts by weight of an alkali metal silicate, and 10 to 1000 parts by weight of water. (A). Fly ash containing 80% by weight or more of powder having a particle size of 20 μm or less ,. Fly ash containing 80% by weight or more of powder having a particle size of 20 μm or less, which is fired at 400 to 1000 ° C.,. Inorganic powder obtained by melting fly ash or clay and spraying in gas,
． Inorganic powder obtained by subjecting clay to mechanical energy of 0.1 to 30 kwh / kg ,.
The inorganic powder obtained by further heating the inorganic powder of 1. at 100 to 750 ° C. 20-99.5% by weight of at least one inorganic powder selected from the group consisting of amorphous clay
And (B) 1 selected from the group consisting of alumina cement powder, γ-alumina powder, and alumina powder formed by a thermal spraying method.
A curable inorganic composition comprising 0.5 to 80% by weight of one or more alumina-based powders.

In the present invention, fly ash is J
Fine ash particles collected by a dust collector from a pulverized coal combustion boiler specified by IS A 6201, silica 45
% Or more, moisture content 1% or less, ignition loss 5% or less, specific gravity 1.9
5 or more, a specific surface area of 2700 cm ² / g or more, and 75% or more pass through a 44 μm standard sieve.

In the present invention, clay has a chemical composition of _{5 to} 85% by weight of SiO _{2 and} 90 to 1 of Al ₂ O ₃
Those containing 0% by weight are preferably used. Specific examples of such clays include, for example, kaolin minerals such as kaolinite, dickanite, nacrite, and halosite, mica clay minerals such as muscovite, illite, fengite, glauconite, celadonite, paragolite, and blancmalite. , Smectites such as montmorillonite, beidellite, nontronite, savonite, sauconite, etc., chlorite, pyrophyllite, talc, vermiculite, wax, and shale.

In the present invention, the inorganic powder of the component (A) of the reactive inorganic powder is as follows. Particle size is 2
Fly ash containing 80% by weight or more of powder of 0 μm or less is used. This fly ash has a particle size of 1
It is preferable that 80 wt% or more of particles having a thickness of 0 μm or less is contained.

When fly ash containing 80% by weight or more of powder having a particle size of 20 μm or less is used, the reactivity with the alkali metal silicate is lowered, and the mechanical strength of the obtained inorganic cured product is lowered. I will end up.

As a method for obtaining fly ash containing 80% by weight or more of powder having a particle size of 20 μm or less, for example, commonly used classification techniques such as wet precipitation classification, wind classification, and specific gravity separation, and jet are used. It is possible to use a crushing technique by a crusher such as a crusher, a ball medium mill, or a roll rolling type crusher.

Further, a dry classifier utilizing wind force, a sieve, power, etc., is provided in the crusher as an internal partial crushing system, or a closed circuit crushing system in which the above crusher and classifier are connected continuously. The use of is effective because the pulverization treatment rate is improved. Above all, a pulverizing / classifying system in which a jet pulverizer and a wind pulverizer are combined is preferable in terms of treatment efficiency and treatment amount.

Further, in the present invention, as the inorganic powder of the component (A) of the reactive inorganic powder, 400-1000
Fly ash containing 80% by weight or more of powder having a particle size of 20 μm or less, which is calcined at 0 ° C. is used. Firing temperature is 4
If the temperature is lower than 00 ° C, the unburned carbon in the fly ash cannot be removed, and the resulting inorganic cured body has a black color and has a poor appearance. Conversely, if it exceeds 1000 ° C,
Since the crystallization of fly ash progresses and the reactivity with the alkali metal silicate decreases, the mechanical strength of the resulting inorganic cured product decreases.

The particle size after firing at 400 to 1000 ° C. is 2
As a method for obtaining fly ash containing 80% by weight or more of powder of 0 μm or less, 8 particles of 20 μm or less in particle diameter are used.
Using fly ash containing 0 wt.
A method of firing at 0 to 1000 ° C. or the like is adopted.

In the present invention, the inorganic powder of the component (A) of the reactive inorganic powder is as follows. An inorganic powder obtained by melting fly ash or clay and spraying in gas is used. As a method for obtaining fly ash or clay by melting and spraying in a gas, for example, a thermal spraying technique used for ceramic coating can be applied. The thermal spray technology is
Preferably, the material powder is melted at a temperature of 2000 to 16000 ° C. and sprayed at a speed of 30 to 800 m / sec. The method includes plasma spraying method, high energy gas spraying method, explosive spraying method, arc spraying method, etc. Is mentioned.

This inorganic powder has a specific surface area of 0.1 to 1
00 m ² / g is preferable, 0.1-60 m ² / g
Are more preferred.

In the present invention, as the inorganic powder of the component (A) of the reactive inorganic powder, 0.1 to 3 on clay
An inorganic powder obtained by applying mechanical energy of 0 kwh / kg is used.

The particle size of the clay is not particularly limited, but from the viewpoint of effective utilization of mechanical energy, the average particle size is 0.1 to 50.
0 μm is preferable, and 0.1 to 100 μm is particularly preferable.

The application of mechanical energy means so-called mechanochemistry in which a material is subjected to a compressive force, a shearing force, an impact force or the like to cause an increase in surface area and other structural changes. Specifically, for example,
A crusher generally used for the purpose of crushing, for example, a ball medium mill (ball mill, vibration mill, planetary mill, etc.) in which impact, friction, compression, shear, etc. are combined in the crushing mechanism, a medium stirring type mill, a roller mill, It is possible to use a mortar or the like, or a jet crusher whose mainstream is impact or grinding.

The mechanical energy may be added by a dry method or a wet method. Also, cement clinker and silica sand,
Alcohols such as methyl alcohol used when crushing limestone, etc., or liquid systems centering on ethanolamines such as triethanolamine, solid systems such as sodium stearate and calcium stearate, and gas systems such as acetone vapor. A grinding aid may be used.

The mechanical energy applied to the powder is
Limited to 0.1 to 30 kwh / kg. When the mechanical energy is less than 0.1 kwh / kg, the activity of the inorganic powder does not increase and the reactivity with the alkali metal silicate is low. On the other hand, when the mechanical energy is more than 30 kwh / kg, the load on the crushing device is large, the balls and the container as the medium are severely worn, and the productivity of the contamination (contamination) in the treated clay and the cost is increased. Problem occurs.

The mechanical energy is the electric power supplied to the crushing device per unit weight of the treated powder when the inorganic powder is put into operation.

The mechanical energy applied to the powder per unit time is preferably 0.01 to 40 kw / kg. Mechanical energy per unit time is 0.01 kW /
If it is less than kg, the activity of the inorganic powder does not increase, and conversely, it becomes 4
When it exceeds 0 kW / kg, the load on the powder device is large,
The balls as the medium and the container are heavily consumed, and problems such as contamination of the treated clay and productivity such as cost arise.

Further, in the present invention, as the inorganic powder of the component (A) of the reactive inorganic powder, The inorganic powder obtained by further heating the inorganic powder at 100 to 750 ° C., preferably 200 to 600 ° C. is used.

If the heating temperature is lower than 100 ° C., the effect due to heating cannot be obtained. On the contrary, if the heating temperature exceeds 750 ° C., the crystallization of the inorganic powder is promoted and the reactivity with the alkali metal silicate is lowered. To do.

The heating method is not particularly limited,
A conventionally known heating device such as a hot air dryer or a rotary kiln can be used.

Further, in the present invention, as the inorganic powder of the component (A) of the reactive inorganic powder, Amorphous clay is used. Amorphous clay refers to a clay in which a crystal peak due to X-ray diffraction is hardly seen. For example, natural amorphous clay minerals such as allophane and hisingelite and natural crystalline clay minerals are heat-treated. Examples thereof include those that have been made amorphous by spraying, those that have been sprayed with natural crystalline clay minerals, and the like. Specifically, for example, a kaolin mineral of 600 to 90 is used.
Metakaolin and the like obtained by heating and dehydrating at 0 ° C. are preferably used. As the thermal spraying method, the same method as the above fly ash is used.

Kaolin mineral is a 1: 1 layered silicate,
It is represented by the chemical formula of Al ₂ Si ₂ O ₅ (OH) ₂ , and specific examples thereof include kaolinite, dickanite, nacrite, and halosite.

The metakaolin mineral is made up of 50 kaolin minerals.
It is necessary to perform heat treatment within a temperature range of 0 to 900 ° C. This is because if the heat treatment temperature is less than 500 ° C., the hydroxyl groups of the kaolin mineral will not be dehydrated and metakaolin will not be modified. This is because if the temperature exceeds ℃, crystallization will occur and alkali reactivity will be significantly reduced. The preferable range is 600 to 800 ° C. The heat dehydration treatment time is preferably 5 minutes to 10 hours. If the treatment time is too short, modification to metakaolin does not occur, and if it is too long, no further effect is obtained.

The particle size of metakaolin is not particularly limited, but from the viewpoint of effective use of mechanical energy, the average particle size is preferably 0.1 to 500 μm, more preferably 0.1 to 100 μm.

Mechanical energy may be applied to metakaolin. The method of applying mechanical energy is the same as the method explained in the above inorganic powder.

In the present invention, as the alumina powder as the component (B) of the reactive inorganic powder, alumina cement powder is first used. Alumina cement powder is a cement containing calcium aluminate as a main mineral and has a chemical composition of 30% by weight or more of Al ₂ O ₃ and Ca.
A material containing 50% by weight or less of O, JIS R
2511 refers to those regulated.

In the present invention, γ-alumina powder is used as the alumina-based powder of the component (B) of the reactive inorganic powder. The γ-alumina powder is a general term for powders having poor crystallinity caused by dehydration of hydrates other than diaspore. As such, for example, Sumitomo Chemical Co.,
Trade name: Activated alumina and the like can be mentioned.

In the present invention, an alumina powder formed by a thermal spraying method is used as the alumina-based powder of the component (B) of the reactive inorganic powder. Alumina powder formed by the thermal spraying method is obtained by thermal spraying a composition containing Al ₂ O ₃ as a main component, and the method of thermal spraying of alumina is the same as the thermal spraying of fly ash. As such a thing, the Micron company make, a brand name; Harimack, etc. are mentioned, for example.

When the amount of the alumina-based powder (B) in the reactive inorganic powder decreases, the reactivity of the reactive inorganic powder decreases, and when the amount increases, the strength of the obtained cured product decreases. It should be 80% by weight.

Alkali metal used in the present invention
As a silicate, M₂O ・ nSiO ₂(M = K, Na,
Water-soluble salt represented by one or more metals selected from Li)
The liquid is preferably n = 0.05 to 8, and n =
More preferably 0.1 to 3, and n = 0.5 to 2.5.
Are particularly preferred. If n is too small, nothing can be obtained.
The durability of the mechanically cured product decreases, and if it is too large, the viscosity of the solution
Is increased, making it difficult to mix with inorganic powder.
There is

The amount of the alkali metal silicate aqueous solution added is limited to 1 to 300 parts by weight, preferably 1 to 250 parts by weight, and 10 to 15 parts by weight, based on 100 parts by weight of the reactive inorganic powder.
0 weight part is more preferable. If the addition amount is less than 1 part by weight, the reactivity with the reactive inorganic powder becomes low, and conversely, it becomes 3
If it exceeds 100 parts by weight, the mechanical strength of the obtained inorganic cured product will decrease.

In the present invention, the alkali metal silicate is added in the form of an aqueous solution. The concentration of the aqueous solution is not particularly limited, but if it is too low, the reactivity with the inorganic powder decreases, and conversely, if it is too high, a fixed component is likely to occur, so it is necessary to be 1%, and 1 to 70% preferable.

The alkali obtain metal silicate solution is an alkali metal silicate may be directly dissolved in water but, SiO _2, such as silica sand, silica stone powder alkali metal hydroxide solution
The components may be dissolved so that n becomes a predetermined value.

In the present invention, the amount of water added must be 10 to 1000 parts by weight, preferably 10 to 750 parts by weight, and 10 to 4 parts by weight, based on 100 parts by weight of the inorganic powder.
More preferably, it is 00 parts by weight. When the addition amount is less than 10 parts by weight, it becomes impossible to mix with the inorganic powder, and conversely, when the addition amount exceeds 1000 parts by weight, the mechanical strength of the obtained inorganic cured product decreases.

In the present invention, a filler may be added if necessary. The filler is preferably insoluble in water, does not inhibit the curing reaction of the curable inorganic composition, and does not significantly inhibit the action of any constituent material used in the composition of the present invention, such as silica sand and river sand. Cement mortar aggregates, silica flour, silica fume, bentonite, mixed cement admixtures such as blast furnace slag, sepiolite, wollastonite, natural minerals such as mica, calcium carbonate, diatomaceous earth and the like. Silica balloons, perlite, fly ash balloons, shirasu balloons, glass balloons, inorganic natural foams such as foamed and baked clay, phenol resin, urethane resin, synthetic resin foams such as polyethylene, and vinylidene chloride balloons for the purpose of further weight reduction. Etc. may be added. These may be added alone or in combination of two or more.

When the average particle size of the above-mentioned inorganic filler is small, the strength of the finally obtained cured product is lowered, and when it is large, the particles of the inorganic filler are difficult to disperse, so that the impact strength is lowered. 0.03 to 500 μm is preferable. The amount of the above-mentioned inorganic filler is preferably 100 parts by weight or less with respect to 100 parts by weight of the hydraulic inorganic substance, because the strength of the finally obtained cured product decreases as the added amount increases.

In the present invention, reinforcing fibers may be further added if necessary. As the reinforcing fiber, any one can be used according to the performance desired to be imparted to the molded product, and examples thereof include vinylon fiber, polyamide fiber, polyester fiber, polypropylene fiber, carbon fiber, aramid fiber, glass fiber, potassium titanate fiber, and steel fiber. Can be used.
The fiber diameter of the reinforcing fiber is reaggregated at the time of mixing when it becomes thin, fiber balls are easily formed by entanglement, the strength of the finally obtained cured product is not further improved, and when it becomes thick or short, the tensile strength is increased. The reinforcing effect such as improvement is small, and when it is long, the dispersibility and orientation of the fiber are deteriorated. Therefore, the fiber diameter is 1 to 500 denier and the fiber length is 1
-15 mm is preferable. Since the dispersibility of the fibers decreases as the amount of the reinforcing fibers added increases, the hydraulic inorganic substance 10
It is preferably 20 parts by weight or less with respect to 0 parts by weight.

In order to obtain an inorganic cured product from the composition of the present invention, a reactive inorganic powder, an alkali metal silicate aqueous solution, and if necessary, a filler and a mixture obtained by mixing reinforcing fibers are cast. It may be formed into a desired shape by any conventionally known method such as press molding or extrusion molding, and then cured.

The curing temperature may be room temperature, but may be 50 to 200.
The curing reaction can be promoted and the mechanical properties can be improved by curing at a temperature of ° C.

[0045]

The curable inorganic composition of the present invention comprises 100 parts by weight of reactive inorganic powder, 1 to 300 parts by weight of alkali metal silicate, and 10 to 1000 parts by weight of water. (A). Fly ash containing 80% by weight or more of powder having a particle size of 20 μm or less ,. 400-100
80% by weight of powder having a particle size of 20 μm or less, which is fired at 0 °
Fly ash containing the above ,. Inorganic powder obtained by melting fly ash or clay and spraying in gas ,. Inorganic powder obtained by subjecting clay to mechanical energy of 0.1 to 30 kwh / kg ,. The inorganic powder obtained by further heating the inorganic powder of 1. at 100 to 750 ° C. One or more inorganic powders 20 to 9 selected from the group consisting of amorphous clay
9.5% by weight and 0.5 to 80 of one or more alumina powders selected from the group consisting of (B) alumina cement powder, γ-alumina powder, and alumina powder formed by a thermal spraying method.
Since the inorganic powder is a powder having a fine particle size, the specific surface area is increased or the activity is improved, and the inorganic powder is substantially completely amorphized. , The reactivity of the inorganic powder in the composition with the alkali metal silicate is enhanced in combination with the action of the coexisting alumina-based powder as a curing accelerator, so that the curing time should be significantly shortened. In addition, it is possible to obtain an inorganic hardened product exhibiting high strength and to introduce a large amount of an alumina component by an alumina-based powder, so that the inorganic hardened product is excellent in heat resistance and weather resistance. Can be obtained. Furthermore, when the calcined inorganic powder is used, unburned carbon can be removed, and an inorganic cured product having an excellent appearance can be obtained.

[0046]

EXAMPLES The present invention will be described in more detail by way of examples. Manufacture of inorganic powders 1-5

Fly ash (manufactured by KANDEN KAKO, 50% by weight or less; conforming to JIS A6201) was classified by a classifier (manufactured by Nisshin Engineering, trade name: turbo classifier, model: TC-40), Inorganic powder 1 was obtained.

Fly ash (manufactured by Kanden Kako Co., Ltd., 20 micron or less, 50% by weight; conforming to JIS A6201) was crushed by a jet mill (manufactured by Makino Co., Ltd.) to obtain an inorganic powder 2.

[0049] Classified fly ash (manufactured by Onoda Cement Co., trade name; Super Flow, hereafter referred to as inorganic powder 3) is melted at 2500 ° C and then sprayed into the atmosphere at a speed of 80 m / sec to give an inorganic powder. Body 5 (BET specific surface area 28m
² / g) was obtained.

Further, the following tests were carried out together with metakaolin (manufactured by Tsuchiya Kaolin, hereinafter referred to as inorganic powder 4).

Physical Properties of Inorganic Powders 1-5 (1) Chemical Composition The inorganic powders 1-5 were made into SiO ₂ and Al by a fluorescent X-ray apparatus.
The composition of ₂ O ₃ was analyzed.

(2) Particle size distribution The particle size distribution of the inorganic powders 1 to 4 was measured by a laser diffraction type particle size distribution meter (manufactured by Seishin Enterprise Co., Ltd., model: PRO-7000S). The results of (1) and (2) are shown in Table 1.

[0053]

[Table 1]

Manufacture of Inorganic Powders 6 to 10 The inorganic powder 1 is fired at a temperature of 600 ° C. to have a particle size of 20 μm.
An inorganic powder 6 containing 100% by weight of the following powder was obtained.

Kaolin (chemical composition: SiO ₂ 45.7)
%, Al ₂ O ₃ 38.3%, average particle size 8 μm, specific surface area 5.8 m ² / g) at 2500 ° C. and then sprayed into the atmosphere at a speed of 50 m / sec to give the inorganic powder 7. Recovered. The obtained inorganic powder 7 had an average particle size of 14.8 μm and a specific surface area of 2.0 m ² / g, and no crystallinity peak was confirmed by X-ray diffraction analysis. there were.

Kaolin (chemical composition: SiO ₂ 45.7)
%, Al ₂ O ₃ 38.3%, average particle size 8 μm, specific surface area 5.8 m ^{2 /} g) 1.7 kg, manufactured by Mitsubishi Heavy Industries, Ltd. under the trade name “Ultrafine Mill AT-20 (zirconia ball 1
0 mmφ used, ball filling rate 85%, triethanolamine 25% as a grinding aid, 10 g of a mixture of ethanol 75% was supplied, and 25 kgh / kg (8 hours ×
3.125 kw / kg) of mechanical energy was applied to obtain an inorganic powder 8.

The inorganic powder 8 was heated at 300 ° C. for 3 hours to obtain an inorganic powder 9. 1.7 kg of inorganic powder 4
Manufactured by Mitsubishi Heavy Industries, Ltd., product name "Ultra Fine Mill AT-
20 (using a zirconia ball 10 mmφ, using a ball filling rate of 85%, and using 10 g of a mixture of triethanolamine 25% and ethanol 75% as a grinding aid).
Inorganic powder 10 was obtained by applying mechanical energy of 9 kgh / kg (3 hours × 3.3 kw / kg).

Examples 1 to 26, Comparative Examples 1 to 15 Predetermined amounts of inorganic powders 1 to 10 shown in Tables 2 to 5, fly ash (manufactured by Kanden Kako Co., Ltd., 20 microns or less; 50% by weight;
JIS A 6201), Alumina cement 1
(Chemical composition Al ₂ O ₃ 40% by weight, CaO 38% by weight), Alumina cement 2 (Chemical composition Al ₂ O ₃ 56% by weight, CaO 38% by weight), Alumina formed by thermal spraying method (Micron, trade name “ Harimack ”), γ-alumina (Sumitomo Chemical Co., Ltd., trade name“ Activated Alumina ”), silica sand (Sekimoto Kenzai Co., Ltd. No. 8 silica sand), vinylon fiber (Kuraray Co., Ltd., trade name“ RM182 ”), Table 2 Concentration shown in 5,
An alkali metal aqueous solution or an alkali metal silicate aqueous solution adjusted to a molar ratio is mixed for 5 minutes with a mixer, and the resulting mixture is 150 mm wide, 150 mm long, 10 mm deep.
It was cast in the mold and heated in a hot air dryer at 90 ° C. for a predetermined time to obtain a cured product. The obtained inorganic cured product is 150
It cut | disconnected to x50x10mm and obtained the test piece. The obtained test piece was used for the following evaluations.

[0059]

[Table 2]

[0060]

[Table 3]

[0061]

[Table 4]

[0062]

[Table 5]

Evaluation of Inorganic Cured Product (1) Bending Strength After drying the obtained test piece at 50 ° C. for 10 hours, 24
After leaving for a time, the bending strength was measured according to JIS A1408.

(2) Demolding property When the material is demolded when it is cured for a predetermined time and is released without cracking, it is marked with ◯, when a chip is formed at the end, it is marked with Δ, and when it is not hardened, marked with x. did.

(3) Appearance Evaluation The obtained test pieces were visually observed, and those with no cracks or cracks were marked with ◯, and those observed were marked with x.

(4) Hot Water Test A test piece obtained from a cured product cured at 90 ° C. for 5 hours was immersed in hot water at 98 ° C. for 2 hours, and the appearance was observed. Those with a loss of gloss were marked with an X. Further, the bending strength was measured in the same manner as in (1) to obtain the bending strength strength retention rate.

(5) Heat Shrinkage Initiation Temperature The heat shrinkage temperature of the test piece obtained from the cured product cured at 90 ° C. for 5 hours was measured by a thermal analyzer (manufactured by JEOL Ltd.). The above results are shown in Tables 6-9.

[0068]

[Table 6]

[0069]

[Table 7]

[0070]

[Table 8]

[0071]

[Table 9]

[0072]

EFFECTS OF THE INVENTION Since the curable inorganic composition of the present invention is as described above, the curing time can be significantly shortened, and the strength of the inorganic cured composition is high and the inorganic cured composition is excellent in heat resistance and weather resistance. You can get the body. Furthermore, when the calcined inorganic powder is used, an inorganic cured product having an excellent appearance can be obtained.

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Claims (1)

[Claims] 1. 100 parts by weight of reactive inorganic powder, 1 to 300 parts by weight of alkali metal silicate, and 10 to 1000 parts of water.
The reactive inorganic powder comprises (A). Fly ash containing 80% by weight or more of powder having a particle size of 20 μm or less ,. Fly ash containing 80% by weight or more of powder having a particle size of 20 μm or less, which is fired at 400 to 1000 ° C.,. Inorganic powder obtained by melting fly ash or clay and spraying in gas,
． Inorganic powder obtained by subjecting clay to mechanical energy of 0.1 to 30 kwh / kg ,.
The inorganic powder obtained by further heating the inorganic powder of 1. at 100 to 750 ° C. 20-99.5% by weight of at least one inorganic powder selected from the group consisting of amorphous clay
And (B) 1 selected from the group consisting of alumina cement powder, γ-alumina powder, and alumina powder formed by a thermal spraying method.
A curable inorganic composition comprising 0.5 to 80% by weight of one or more alumina-based powders.