JP2001088116A - Manufacture of inorganic hardened body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of an inorganic hardened body which is excellent in production efficiency and material efficiency and enables attainment of the inorganic hardened body excellent in performance. SOLUTION: In a manufacturing method of an inorganic hardened body wherein a process (A) for obtaining a slurry-like mixture by mixing a hardening inorganic composition constituted mainly of SiO2-Al2O3-series reactive powder, an alkali metal silicate and water by a mixer and a process (B) for discharging the slurry-like mixture from the mixer and hardening it by heating are executed repeatedly, a part 3 of the slurry-like mixture obtained in the preceding process (A) is left in the batch type mixer 1 and a fresh hardening inorganic composition 4 is mixed therein in and after the second process (A).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an inorganic cured material used for building materials and the like. More specifically, the present invention relates to a method for producing an inorganic cured product using a batch mixer.

[0002]

2. Description of the Related Art Conventionally, an inorganic cured material used for building materials is prepared by mixing a curable inorganic composition comprising an inorganic reactive powder, an alkali metal silicate and water using a batch mixer. , Cured and many methods have been proposed. In the curable inorganic composition,
Further, a foaming agent may be added to produce an inorganic foamed cured product.

For example, Japanese Patent Publication No. 4-45471 discloses a method for producing an inorganic cured product by heating and curing a mixture of an oxide mixture containing amorphous silicon dioxide and aluminum oxide and an alkali metal silicate. And JP-A-11-71165 discloses SiO ₂
-Al ₂ O ₃ based inorganic powder, alkali metal silicates, method by heating a curable inorganic composition comprising water to produce the inorganic cured body is disclosed. Further, JP-A-11-12
No. 055 discloses a reactive inorganic powder, an alkali metal silicate, and a mixing device in which a rotatable inner container having a shape substantially similar to the outer container and having a large number of projections on the surface is provided inside the outer container. A method for producing an inorganic foamed cured product in which a composition comprising salt, water and a foaming agent is mixed is described.

[0004] On the other hand, batch type mixers are widely used because of easy adjustment of mixing time and small variation in the mixture ratio of the mixture. A mixer such as a mixer is used. In this case, the slurry-like mixture obtained by mixing the inorganic reactive powder is 5000 cps.
(20 ° C.) or higher, it took time to discharge the slurry-like mixture from the mixer, and it was also difficult to discharge all of the mixture. For this reason, the remaining slurry-like mixture easily adheres and remains in the mixer, and when the curable inorganic mixture of the next batch is charged without washing the batch-type mixer, the previous batch adhering to the wall surface of the mixer is added. The small amount of the slurry mixture cannot be sufficiently mixed with the newly added curable inorganic mixture, and as the number of batches increases, the amount of the mixture increases, and it hardens and accumulates while adhering to the inner wall of the mixer. There was a problem of doing.

[0005] In order to solve such a problem, it is most desirable to wash and remove the slurry-like mixture remaining in the mixer, but a new washing step is required and the product yield is reduced. As a result, there is a problem that the production efficiency and the raw material efficiency are greatly inferior.

When the curable inorganic composition is of a cement type, after the mixing is completed, the slurry-like mixture is discharged from the mixer as much as possible, and then the mixer is washed with water as a raw material for the next batch, and the washing liquid is washed. Since the method of mixing the next batch of cement or the like is used while leaving the mixture, there is no problem that the mixture hardens and accumulates in the mixer.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing an inorganic cured product which has excellent production efficiency and raw material efficiency and has excellent strength.

[0008]

Means for Solving the Problems The present inventor has proposed SiO _2-
A curable inorganic composition mainly composed of an Al ₂ O ₃ -based reactive powder, an alkali metal silicate, and water is mixed by a batch mixer to obtain a slurry mixture, which is discharged from the batch mixer. Of the amount of the slurry-like mixture remaining in the mixer and the physical properties of the newly obtained slurry-like mixture and the inorganic cured body in the method for producing an inorganic cured body comprising By leaving a part of the slurry-like mixture obtained in the previous batch in the mixer, it is not necessary to wash the inside of the mixer and discard each component, thereby improving the raw material efficiency. The discharge time of the slurry-like mixture can be shortened, and as a result, the production efficiency is improved, and the reaction-promoting component is contained in the remaining slurry-like mixture. The quality cured product has an excellent performance, we have completed the present invention.

That is, the present invention relates to SiO ₂ —Al ₂ O ₃
(A) obtaining a slurry-like mixture by mixing a curable inorganic composition containing a system-reactive powder, an alkali metal silicate, and water as main components with a batch-type mixer; In the method for producing an inorganic cured product, which comprises repeatedly performing the step (B) of discharging from the mixer and heating and curing, in the second and subsequent steps (A), the slurry remaining in the batch type mixer is used. State mixture,
Newly added and mixed alkali metal silicate and water, followed by mixing by adding SiO ₂ -Al ₂ O ₃ -based reactive powders, inorganic cured bodies, characterized in that to obtain a new slurry mixture Is provided.

[0010] In the method for producing an inorganic cured product according to the present invention, in the second and subsequent steps (A), SiO ₂ -Al is added to the previous slurry mixture remaining in the batch mixer. _A new slurry-like mixture is obtained by adding and mixing a curable inorganic composition containing ₂ O ₃ -based reactive powder, an alkali metal silicate, and water as main components. It is intended to provide a manufacturing method.

Further, the present invention relates to the above-mentioned SiO ₂ -Al ₂
O ₃ based reactive _powder, SiO 2 10 to 90 wt%, Al ₂
The method for producing an inorganic cured product, comprising 90 to 10% by weight of O ₃ , and the curable inorganic composition,
Against SiO ₂ -Al ₂ O ₃ -based reactive powder 100 parts by weight, 0.2 to 450 parts by weight of alkali metal silicate, water 10
In the method for producing a cured inorganic material described above, wherein the amount of the slurry-like mixture remaining in the batch-type mixer is the same as that of the step (A), It is intended to provide a method for producing the above-mentioned inorganic cured product, which is 5 to 50% by weight based on the total weight of the new slurry-like mixture obtained in (A).

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. Manufacturing method for the inorganic cured body of the present invention, SiO ₂ -A
l ₂ O ₃ system reactive powder, alkali metal silicates, and water and the step (A) of a mixture of curable inorganic composition mainly in a mixer to obtain a slurry-like mixture, the slurry mixture The step (B) of discharging from the batch mixer and curing by heating is repeated, and in the second and subsequent steps (A), a new alkali metal silicate is added while a specific amount of the slurry-like mixture remains in the mixer. to and mixed with salt and water was slurried, and then SiO ₂ -Al ₂ O ₃ -based added reactive powder or obtain a new slurry mixture, or slurry-like mixture was allowed to remain in the mixer, A new curable inorganic composition is added to obtain a new slurry-like mixture, and the obtained slurry-like mixture is cured by heating to produce a cured inorganic substance.

(SiO_Two-Al_TwoO_ThreeSystem reactive powder)
SiO used in light_Two-Al_TwoO_ThreeBased reactive powder is S
iO_Two10-90% by weight, Al_TwoO_Three90 to 10% by weight
The specific surface area is 0.1 to 100 m ^Two/ G
It is desirable.

Examples of the SiO ₂ —Al ₂ O ₃ -based reactive powder used in the present invention include the following. (A) Fly ash containing 80% by weight or more of powder having a particle size of 20 μm or less (b) Fired at 400 to 1000 ° C., and having a particle size of 20 μm
Fly ash containing at least 80% by weight of the following powder: (c) SiO ₂ —Al ₂ O ₃ -based reactive powder obtained by melting fly ash or clay and spraying it into a gas; SiO ₂ —Al ₂ O obtained by applying a mechanical energy of 1 to 30 kwh / kg
₃ type reactive powder (e) Si obtained by further heating (d) the SiO ₂ —Al ₂ O ₃ type reactive powder at 100 to 750 ° C.
O ₂ -Al ₂ O ₃ system reactive powders (f) 1 or more members selected from the herd consisting metakaolin of SiO ₂ -Al ₂ O ₃ -based reactive powders

When SiO ₂ is less than 10% by weight (Al ₂ O ₃
If the content of SiO ₂ exceeds 90% by weight (Al ₂ O ₃ is less than 10% by weight), the reaction is too high, and the viscosity of the slurry mixture sharply increases. The properties are too low to obtain a good cured inorganic material.

(Alkali metal silicate) The alkali metal silicate used in the present invention is M ₂ O · nSiO ₂ (M = L
i, K, Na or a mixture thereof), and n =
0.5 to 8, preferably n = 0.5 to 3,
More preferably, n = 0.5 to 2.5. When n is less than 0.5, the mechanical strength of the obtained inorganic cured product is low, and when n is more than 8, the alkali metal silicate aqueous solution is liable to gel, and the viscosity sharply increases. In addition, there is a problem that mixing with the SiO ₂ —Al ₂ O ₃ -based reactive powder becomes difficult.

In the method for producing an inorganic cured product of the present invention, it is desirable that the alkali metal silicate is used as an aqueous solution. The use of the aqueous alkali metal silicate solution facilitates the mixing of the components.
The concentration of the alkali metal silicate is not particularly limited, but if it is too low, the reactivity with the SiO ₂ —Al ₂ O ₃ -based reactive powder decreases, and if it is too high, a solid content is likely to be generated. Therefore, 1 to 70% is preferable.

The alkali metal silicate aqueous solution can be obtained by dissolving the alkali metal silicate in water under heat and pressure. The aqueous alkali metal hydroxide solution has the chemical formula M ₂ O representing the alkali metal silicate. It can also be obtained by dissolving under heat and pressure together with SiO ₂ components such as silica sand and silica powder so that n in nSiO ₂ becomes a predetermined value.

(Curable Inorganic Composition) The curable inorganic composition used in the present invention is the above-mentioned SiO ₂ —Al ₂ O ₃
It contains the system-reactive powder, the alkali metal silicate described above, and water as main components. The mixing ratio of these components is 0.2 to 450 parts by weight of alkali metal silicate, preferably 10 to 350 parts by weight, based on 100 parts by weight of the SiO ₂ —Al ₂ O ₃ -based reactive powder. Preferably 2
0 to 250 parts by weight, water 10 to 1500 parts by weight, preferably 45 to 1000 parts by weight, more preferably 50 to 5 parts by weight.
00 parts by weight.

The SiO ₂ —Al ₂ O ₃ -based reactive powder, when mixed with an alkali metal silicate and water, elutes aluminate ions and aluminosilicate ions into water. Is promoted. Elution amount of aluminate ions and aluminosilicate ion, SiO ₂ -Al ₂ O ₃ system reactive powder / alkali metal silicate / water ratio, mixing time, but is greatly influenced by the mixing temperature and alkali concentration, in particular The slurry-like mixture after the completion of the mixing contains a large amount of both the above-mentioned ions, and thus promotes the curing of the slurry-like mixture. In this regard,
The remaining slurry-like mixture has an effect of accelerating the curing of the slurry-like mixture.

When the mixing ratio of the alkali metal silicate is 0.2
If the amount is less than part by weight, the amount of alkali required for the curing reaction is too small, resulting in poor curing. If the amount is more than 450 parts by weight, there is a problem in the water resistance of the obtained inorganic cured product.

The water may be blended as an aqueous solution of an alkali metal silicate, or may be mixed independently, or both methods may be used in combination. When the mixing ratio of water is 10
If the amount is less than parts by weight, it becomes impossible to mix the SiO ₂ —Al ₂ O ₃ -based reactive powder and the alkali metal silicate.
On the other hand, when the amount exceeds 1500 parts by weight, the strength of the obtained inorganic cured product decreases.

The curable inorganic composition used in the present invention may be a foaming agent, an inorganic filler, a reinforcing fiber, a foaming aid, an organic foam or an inorganic foam, as long as the performance of the inorganic cured product is not impaired. May be further included.

Hydrogen peroxide, sodium peroxide
Of potassium, potassium peroxide, sodium perborate, etc.
Oxide, or Mg, Ca, Cr, Mn, Fe, C
o, Ni, Cu, Zn, Al, Ga, Sn, Si, ferrite
Metal powder such as silicon. Koss
Consider safety, availability, availability, and ease of mixing
And preferably hydrogen peroxide and aluminum powder.
The mixing ratio of the foaming agent is SiO _Two-Al_TwoO_ThreeReactive powder
In the range of 0.01 to 10 parts by weight per 100 parts by weight,
Decide appropriately considering the density of the desired foam, etc.
Can be. When the compounding ratio is less than 0.01 parts by weight
Means that the foaming ratio is too small to obtain a foam and 10 parts by weight
If it exceeds, the foaming gas becomes excessive and breaks, resulting in low strength.
The following problem arises. Also, if necessary, fine air bubbles
In order to make the surface active, a surfactant may be used in combination.

When using hydrogen peroxide as the blowing agent,
It is preferably used as an aqueous solution of hydrogen peroxide, and is usually contained in an aqueous solution of hydrogen peroxide.
5 to 35% by weight aqueous hydrogen peroxide solution, preferably 1 to 25
% Aqueous hydrogen peroxide solution, more preferably 5 to 15% aqueous hydrogen peroxide solution. The concentration of hydrogen peroxide is 0.
If the amount is less than 5% by weight, the amount of water is increased with respect to the amount of hydrogen peroxide. When the concentration of hydrogen peroxide is 3
If the content exceeds 5% by weight, foaming is too fast, foaming cannot be performed stably, and the oxygen concentration is high, which is dangerous.

When metal powder is used as the foaming agent, it is preferable that the powder is dispersed in an appropriate amount of water and mixed. In order to obtain good dispersibility, a thickener, an emulsifier and the like may be used in combination. The particle diameter of the metal powder is preferably 1 to 200 μm. When the particle size exceeds 200 μm, the reactivity is reduced. When the particle size is less than 1 μm, the dispersibility is reduced, and the reactivity is increased, and the foaming may be too fast.

The inorganic filler has the effects of reducing shrinkage during curing, improving the fluidity of the slurry, densifying cells, stabilizing bubbles, and the like. As the inorganic filler, for example, silica sand,
Silica powder, slag, mica, talc, wollastonite,
Examples include porous powders such as calcium carbonate, zeolite, activated carbon, and alumina gel. The mixing ratio of the inorganic filler is as follows: SiO ₂ —Al ₂ O ₃ -based reactive powder 10
The amount is preferably 700 parts by weight or less, more preferably 10 to 500 parts by weight, based on 0 parts by weight. Compounding ratio is 7
If the amount exceeds 00 parts by weight, the strength of the inorganic cured product may be reduced.

The inorganic filler has a particle size of 0.01 μm to 1 μm.
A particle size of mm is preferred. If the particle size is less than 0.01 μm, the amount of adsorbed water increases during mixing, so that the viscosity increases and the workability decreases. If the particle size exceeds 1 mm, foaming becomes unstable.

The reinforcing fibers have the effect of improving the strength of the cured inorganic material and preventing cracks. Examples of the reinforcing fibers include organic fibers such as vinylon, polypropylene, aramid, acrylic, and rayon, and inorganic fibers such as carbon, glass, potassium titanate, alumina, steel, and slag wool. The mixing ratio of the reinforcing fiber is SiO ₂ −
It is preferably 10 parts by weight or less based on 100 parts by weight of the Al ₂ O ₃ -based reactive powder. If it exceeds 10 parts by weight, the dispersibility of the fiber may be reduced.

The preferred fiber length of the reinforcing fiber is 1 to 15 m
m, a preferable fiber diameter is 1 to 500 μm. If the fiber length is less than 1 mm or the fiber diameter exceeds 500 μm, the reinforcing effect is small. When the fiber length exceeds 15 mm,
When the dispersibility of the reinforcing fibers is reduced and the fiber diameter is less than 1 μm, the fibers are agglomerated at the time of mixing to form fiber balls, and the strength of the inorganic cured product does not improve.

Examples of the foaming auxiliary include silica gel,
Porous powders such as zeolite, activated carbon, and alumina gel;
Metal stearate such as zinc stearate, calcium stearate and aluminum stearate; metal oleate such as sodium oleate and potassium oleate; metal palmitate such as sodium palmitate and potassium palmitate; sodium laurylbenzenesulfonate And a surfactant such as sodium lauryl sulfate. The mixing ratio of the foaming aid is
For 100 parts by weight of the SiO ₂ —Al ₂ O ₃ -based reactive powder,
0 to 10 parts by weight is preferred. If it exceeds 10 parts by weight, the viscosity of the slurry mixture is increased to break bubbles.

The organic foam and the inorganic foam have the effect of reducing the weight of the cured inorganic material. Examples of the organic foam include a granular foam of a synthetic resin such as vinyl chloride, phenol, urea, styrene, urethane, and ethylene. Examples of the inorganic foam include a glass balloon, a shirasu balloon, a fly ash balloon, Silica balloons, perlite, hillite, granular foamed silica and the like can be mentioned. The organic foam and the inorganic foam can be used alone or in combination. The mixing ratio of the organic foam or mineral _foam, to SiO 2 -Al ₂ O ₃ -based reactive powder 100 parts by weight, preferably 10 to 100 parts by weight, more preferably from 30 to 80 parts by weight. If the proportion is less than 10 parts by weight, the effect of weight reduction cannot be obtained, and if it exceeds 100 parts by weight, the mechanical strength may be reduced.

The organic or inorganic foam preferably has a specific gravity of 0.01 to 1, more preferably 0.1 to 1.
03 to 0.7. When the specific gravity is less than 0.01, the mechanical strength of the cured inorganic material is reduced, and when it exceeds 1, the effect of weight reduction cannot be obtained.

(Manufacturing Method of Inorganic Cured Body) As described above, the method of manufacturing an inorganic cured body according to the present invention uses SiO ₂ -A
l ₂ O ₃ system reactive powder, alkali metal silicates, and water and the step (A) of a mixture of curable inorganic composition mainly in a mixer to obtain a slurry-like mixture, the slurry mixture The step (B) of discharging from the batch mixer and curing by heating is repeated, and in the second and subsequent steps (A), a part of the slurry-like mixture obtained in the previous step (A) is placed in the mixer. While remaining, fresh alkali metal silicate and water are added and mixed to form a slurry,
A new slurry-like mixture is obtained by adding an iO ₂ -Al ₂ O ₃ -based reactive powder, or a new slurry-like mixture is obtained by adding a new curable inorganic composition to the slurry-like mixture remaining in the mixer. A mixture is obtained, and the obtained slurry mixture is cured by heating. In any case, it is important to obtain a slurry-like mixture by adding a new curable inorganic composition and mixing the slurry-like mixture with the slurry-like mixture remaining in the mixer and before curing.

The second and subsequent steps (A) will be described with reference to the drawings. FIG. 1 is a sectional view of a batch mixer. 1 is a batch type mixer, 2 is a batch type mixer container, 3 is a slurry-like mixture left,
4 is a newly added curable inorganic composition, and 5 is a stirring blade. A part 3 of the slurry-like mixture obtained in the previous step (A) is left in the batch-type mixer vessel 2, a new curable inorganic composition 4 is added thereto, and the stirring blade 5 is rotated. To prepare a new slurry-like mixture. In FIG. 2, a newly prepared slurry mixture 6 is discharged from the batch type mixer vessel 2 and poured into a mold 7. 8 is a cast slurry-like mixture. The cast slurry mixture is heated and cured as it is, and then dried to produce an inorganic cured product.

The curable inorganic composition to be newly added is prepared by mixing an alkali metal silicate and water first,
_2- Al ₂ O ₃ -based reactive powder can be added and mixed, but each component of SiO ₂ -Al ₂ O ₃ -based reactive powder, alkali metal silicate, and water can be simultaneously added and mixed. You can also.

When the alkali metal silicate and water are first mixed into the slurry-like mixture left in the mixer, the amount of the remaining slurry-like mixture is not particularly limited. As described above, the ratio is 0.2 to 450 parts by weight, preferably 10 to 350 parts by weight, and 10 to 1500 parts by weight of alkali metal silicate with respect to 100 parts by weight of the SiO ₂ —Al ₂ O ₃ -based reactive powder. Parts by weight.

When all the components of the SiO ₂ —Al ₂ O ₃ -based reactive powder, the alkali metal silicate and the water are simultaneously mixed with the slurry mixture remaining in the mixer,
The amount of the remaining slurry mixture is desirably 5 to 50% by weight based on the total weight of the new slurry mixture. When the amount is less than 5% by weight, mixing with each component cannot be sufficiently performed. On the other hand, when the amount exceeds 50% by weight, the mixer becomes unnecessarily large, resulting in poor production efficiency and not economical.

The method of mixing the curable inorganic composition is not particularly limited, and can be mixed in a batch system using a known mixing device such as an omni mixer or a planetary mixer. When a foaming agent is compounded, the foaming agent is supplied to the mixer together with other components and mixed, but when an inorganic filler, a reinforcing fiber, a foaming aid, an organic foam or an inorganic foam is compounded. Is preferably previously mixed with a SiO ₂ —Al ₂ O ₃ -based reactive powder.

The slurry-like mixture discharged from the mixer is cast into a mold, formed into a desired shape by a conventionally known method such as press molding, heated and cured, and then dried to obtain an inorganic cured material. The body can be manufactured.
In order to accurately fill the slurry mixture into the mold,
The entire mold into which the slurry-like mixture has been injected can be vibrated. The curing temperature may be room temperature,
By curing at 00 ° C., the curing reaction can be accelerated,
The mechanical properties of the obtained inorganic cured product can be improved.

[0041]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to embodiments. In addition, this invention is not limited at all by the following Examples. SiO ₂ —Al ₂ O ₃ -based reactive powder used in Examples 1 to 3 and Comparative Example 1,
The alkali metal silicate aqueous solution, the inorganic filler and the reinforcing fiber are as follows.

(SiO ₂ —Al ₂ O ₃ -based reactive powder) 1.7 kg of metakaolin (SATIN manufactured by Engelhard Co.)
TONE SP33, average particle size 3.3 μm, specific surface area 1
3.9 m ² / g) was supplied to a ball mill (Ultra Fine Mill AT-20, manufactured by Mitsubishi Heavy Industries, Ltd.).
By applying mechanical energy of 9 kwh / kg (3 hours × 3.3 kw / kg), a SiO ₂ —Al ₂ O ₃ -based reactive powder was obtained. The conditions for preparing the SiO ₂ —Al ₂ O ₃ -based reactive powder are summarized in Table 1.

[0043]

[Table 1]

(Alkali metal silicate aqueous solution) 45% potassium silicate aqueous solution (manufactured by Nippon Chemical Industry Co., Ltd., SiO ₂ : K ₂
O = 1.4: 1 (molar ratio)). (Inorganic filler) Wollastonite (Chemolit A-60 manufactured by Tsuchiya Kaolin Industries, Ltd.) and silica powder (Sumitomo Osaka Cement Co., Ltd., Blaine value 5000 cm ² /
g) was used. (Reinforcing fiber) Vinylon fiber (manufactured by Kuraray Co., Ltd., RM18
2 × 3) was used.

(Comparative Example 1) Each component was supplied to an omni-mixer (10 liter in internal capacity, manufactured by Chiyoda Giken Kogyo Co., Ltd.) in the mixing ratio shown in Table 2 and mixed for 15 minutes to obtain a slurry of the curable inorganic composition A mixture was obtained. The resulting slurry-like mixture was discharged from an omni-mixer, and the mold (3
00 mm, 300 mm in width, 10 mm in depth), manually spread it in the shoulder frame, and vibrate for 1 minute (frequency 15
(Hz, amplitude 5 mm). Next, the mold was heated together with the mold in a hot air dryer at 85 ° C. for 10 hours.
It dried at 10 degreeC for 10 hours, and obtained the inorganic cured body. After leaving the obtained inorganic cured product in an air-dried state for 24 hours, the JIS
The bending strength was measured according to the method of A1408. Table 3
Shows the results.

[0046]

[Table 2]

[0047]

[Table 3]

Example 1 In Comparative Example 1, each component of the curable inorganic composition shown in Example 1 of Table 2 was newly supplied to the omni mixer after discharging the slurry-like mixture for 15 minutes. Mixed. The mixing ratio between the newly supplied curable inorganic composition and the slurry mixture remaining in the omni mixer was 9: 1 (weight ratio). The obtained slurry mixture was filled in a mold, cured and dried to obtain a cured inorganic material in the same manner as in Comparative Example 1, and the bending strength was measured. Table 3 shows the results.

(Example 2) In Example 1, after the obtained slurry-like mixture was discharged from an omni mixer, the curable inorganic composition shown in Table 2 was newly supplied to the omni mixer and mixed for 15 minutes. did. The mixing ratio between the newly supplied curable inorganic composition and the slurry mixture remaining in the omni mixer was 9: 1 (weight ratio).
The obtained slurry mixture was treated in the same manner as in Comparative Example 1,
After filling in the mold, it was cured to obtain a cured inorganic material, and its bending strength was measured. Table 3 shows the results.

Example 3 In Comparative Example 1, after the obtained slurry mixture was discharged from an omni mixer, the curable inorganic composition shown in Table 2 was newly supplied to the omni mixer and mixed for 30 minutes. did. The mixing ratio between the newly supplied curable inorganic composition and the slurry mixture remaining in the omni mixer was 5: 5 (weight ratio).
The obtained slurry mixture was treated in the same manner as in Comparative Example 1,
After filling in the mold, it was cured to obtain a cured inorganic material, and its bending strength was measured. Table 3 shows the results.

As is clear from the results shown in Table 3, in the mixing steps of Examples 1 to 3, a specific amount of the slurry-like mixture was left in each of the omni mixers. The bending strength was 21
The bending strength was in the range of ^{2 to} 220 kgf / cm ² , and was significantly superior to the bending strength (182 kgf / cm ² ) of the cured inorganic material obtained in Comparative Example 1. In addition, the discharge time of the slurry-like mixture from the omni mixer was as short as 5 to 10 seconds, while the comparative example was as long as 15 seconds in the comparative example.

[0052]

The method for producing an inorganic cured product according to the present invention comprises:
iO ₂ —Al ₂ O ₃ -based reactive powder, alkali metal silicate,
And mixing the curable inorganic composition mainly composed of water and water with a batch mixer to obtain a slurry-like mixture (A)
And a step (B) of repeatedly discharging the slurry-like mixture from a batch-type mixer and heating and curing the same, wherein the slurry-like mixture obtained in the step (A) By partly remaining in the mixer positively, the time for discharging the slurry-like mixture obtained by newly mixing from the mixer can be reduced,
The newly added curable inorganic composition can be easily mixed, and the remaining slurry-like mixture contains a large amount of a reaction promoting component. Therefore, the raw material efficiency can be increased, the productivity can be increased, and a high-strength inorganic cured product can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a step (A) according to the method for producing an inorganic cured product of the present invention.

FIG. 2 is a diagram illustrating a casting method in a method for producing an inorganic cured product of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Batch-type mixer 2 Batch-type mixer container 3 Residual slurry-like mixture 4 Newly added curable inorganic composition 5 Mixing blade 6 New slurry-like mixture 7 Mold 8 Cast-in slurry-like mixture

Claims (5)

[Claims] 1. A step of mixing a curable inorganic composition containing SiO ₂ —Al ₂ O ₃ -based reactive powder, an alkali metal silicate and water as main components by a batch mixer to obtain a slurry-like mixture. (A) and a step (B) of repeatedly discharging the slurry-like mixture from a batch-type mixer and heating and curing the same, wherein the second and subsequent steps (A) The alkali metal silicate and water are newly added to the slurry-like mixture left in the batch-type mixer and mixed, and then SiO ₂ —Al ₂ O
_A method for producing a cured inorganic material, characterized in that a new slurry-like mixture is obtained by adding and mixing a _3- system reactive powder. 2. A step of mixing a curable inorganic composition containing SiO ₂ —Al ₂ O ₃ -based reactive powder, an alkali metal silicate, and water as main components with a batch mixer to obtain a slurry-like mixture. (A) and a step (B) of repeatedly discharging the slurry-like mixture from a batch-type mixer and heating and curing the same, wherein the second and subsequent steps (A) , ahead of the slurry-like mixture which was allowed to remain in the batch mixer, new SiO ₂ -Al ₂
Production of a cured inorganic material characterized by obtaining a new slurry-like mixture by adding and mixing a curable inorganic composition mainly composed of an O ₃ -based reactive powder, an alkali metal silicate and water. Method. 3. The SiO ₂ —Al ₂ O ₃ -based reactive powder,
SiO ₂ 10 to 90% by weight, Al ₂ O ₃ 90 to 10% by weight
The method for producing an inorganic cured product according to claim 1, wherein the method comprises: 4. The curable inorganic composition comprises SiO ₂ -A
against l ₂ O ₃ system reactive powder 100 parts by weight, 0.2 to 450 parts by weight of alkali metal silicate, comprise water 10 to 1500 parts by weight to one of claims 1 to 3, wherein The method for producing an inorganic cured product according to the above. 5. In the second and subsequent steps (A), the amount of the previous slurry mixture left in the batch mixer is based on the total weight of the new slurry mixture obtained in the step (A). The method for producing an inorganic cured product according to any one of claims 1 to 4, wherein the content is 5 to 50% by weight.