JP4608273B2 - Method for producing inorganic molded body - Google Patents

Description

  The present invention relates to a method for manufacturing an inorganic molded body, and more particularly to a method for manufacturing an inorganic molded body that can be used for building materials and the like using an alkali-reactive inorganic powder.

Conventionally, some inorganic curable compositions that are cured by heat in the presence of alkali have been proposed (see, for example, Patent Document 1). And the high intensity | strength molded object equivalent to a cement-type press article is provided by casting and hardening this inorganic curable composition. Such a molded body is mainly used as a building material such as a wall material.
In the above-mentioned Patent Document 1, an alkali metal oxalate aqueous solution, an alkali-reactive inorganic powder such as ash or fly ash generated in the production of metakaolin, corundum or mullite, water, and filling as necessary It is disclosed that an inorganic molded body useful for a building material can be formed from a curable inorganic composition obtained by mixing a material and an admixture such as organic bentonite.
However, in the invention disclosed in Patent Document 1 and the like, only a small amount of fibers can be added for reinforcement in order to perform casting, and the fibers are arranged in random directions. However, there is a problem that the reinforcing effect of the fiber is small and the strength is low.

JP-A-4-59648 (Claims etc.)

  An object of the present invention is to provide a method for producing an inorganic molded body that is excellent in strength and can be used for a building material in view of the above-described problems of the prior art.

As a result of intensive studies to achieve the above object, the present inventors have extruded and extruded a molding material containing SiO ₂ —Al ₂ O ₃ based inorganic powder, alkali metal silicate and reinforcing fibers. An inorganic molded body that is excellent in strength and can be suitably used as a building material when the molding material is taken up onto the mold at a speed approximately the same as the extrusion speed, and after the molding material is adapted to the mold and cured. It was found that can be obtained. The present invention has been completed based on these findings.

That is, according to the first invention of the present invention, from a molding material containing SiO ₂ —Al ₂ O ₃ inorganic powder (A), alkali metal silicate (B), water (C) and fiber (D). , mixing and kneading step (i), an extrusion-casting process (ii), the familiar step (iii), a method for producing an inorganic molded product through curing step (iv) and drying the (v), the molding The blending ratio of the materials is 50 to 300 parts by weight of alkali metal silicate (B), 50 to 500 parts by weight of water (C) with respect to 100 parts by weight of SiO ₂ —Al ₂ O ₃ inorganic powder (A), And the fiber (D) 1 to 20 parts by weight, and in the extrusion / casting step (ii), when extruding the molding material, the ratio of the cross-sectional area between the molding material inlet side and the outlet side of the mold of the extrusion device Is 3 or more, and in the extrusion / casting step (ii), while extruding the molding material Then, the extruded molding material is taken up on a mold that moves at a speed approximately the same as the extrusion speed, so that the molding material is cast almost uniformly on the mold. Subsequently, in the familiar step (iii), casting is performed. Provided is a method for producing an inorganic molded body, which is characterized by adapting the formed molding material to a mold.

According to a second invention of the present invention, in the first invention, the conforming step (iii) is an inorganic molding characterized in that a molding material is adapted to the mold by applying vibration to the mold. A method of manufacturing a body is provided.
Furthermore, according to the third invention of the present invention, in the first or second invention, the molding material is further added with an inorganic filler (E), an organic / inorganic foam (F), or a foaming agent (G). There is provided a method for producing an inorganic molded body characterized in that at least one of the above is blended.

According to the method for producing an inorganic molded body of the present invention, in the first invention, SiO ₂ —Al ₂ O ₃ based inorganic powder (A), alkali metal silicate (B), water (C) and fiber ( D) When the molding material containing D) is extruded and cast-molded, it is drawn at a speed approximately the same as the extrusion speed when it is poured into the mold by extrusion. It can be cast into the inside, and an inorganic molded body having excellent strength can be obtained.
In the second invention, since each component of the molding material is blended at a specific ratio, it is possible to obtain an inorganic molded body excellent in moldability, productivity, and strength and durability. .
Furthermore, in the third aspect of the invention, since the molding material is adapted to the mold by applying vibration to the mold, even the molding material mixed with a large amount of fibers is cast. Molding is possible, and the fibers can be molded in an oriented state, and an inorganic molded body having further excellent strength can be obtained.
In addition, in the fourth invention, when extruding the molding material, the ratio of the cross-sectional area between the molding material inlet side and the outlet side of the mold of the extrusion device is 3 or more. Is oriented in the flow direction, enabling effective fiber reinforcement and obtaining an inorganic molded body with further improved strength.
Furthermore, in the fifth invention, since the molding material further contains at least one of an inorganic filler (E), an organic / inorganic foam (F), or a foaming agent (G), the molded body. This has the effect of preventing the volume shrinkage or reducing the weight.

Hereinafter, the manufacturing method of the inorganic molded object of this invention is demonstrated in detail for every item.
The method for producing an inorganic molded body of the present invention comprises mixing a SiO ₂ —Al ₂ O ₃ inorganic powder (A), an alkali metal silicate (B), water (C), and fibers (D) from a molding material. A method for producing an inorganic molded body through a kneading step (i), an extrusion / casting step (ii), a conforming step (iii), a curing step (iv) and a drying step (v) , The blending ratio is 50 to 300 parts by weight of alkali metal silicate (B), 50 to 500 parts by weight of water (C), and fiber with respect to 100 parts by weight of SiO ₂ —Al ₂ O ₃ inorganic powder (A). (D) 1 to 20 parts by weight, and in the extrusion / casting step (ii), when the molding material is extruded, the ratio of the cross-sectional area between the molding material inlet side and the outlet side of the mold of the extrusion apparatus is 3 In the extrusion / casting step (ii), the extrusion is performed while extruding the molding material. The formed molding material is taken up on a mold that moves at substantially the same speed as the extrusion speed, so that the molding material is cast almost uniformly on the mold. Subsequently, in the familiar step (iii), the molding material is cast. The molding material is adapted to the formwork.

1. SiO ₂ —Al ₂ O ₃ inorganic powder (A)
As one of the raw material components contained in the molding material according to the present invention, SiO ₂ —Al ₂ O ₃ based inorganic powder (A) is used.
The SiO ₂ —Al ₂ O ₃ inorganic powder (A) is not particularly limited as long as it is a silica-alumina inorganic powder, but the SiO ₂ content is in the range of 10 to 90 wt%, and Al ₂ O ₃ Is preferably an inorganic powder having an average particle size of less than 20 μm, such as SiO ₂ and Al ₂ O ₃ based inorganic powder.
(A) fly ash containing 80% by weight or more of powder having a particle size of 20 μm or less,
(B) fly ash containing 80% by weight or more of a powder having a particle size of 20 μm or less, which is fired in the range of 400 to 1000 ° C .;
(C) an inorganic powder obtained by melting fly ash or clay and spraying it in a gas;
(D) an inorganic powder obtained by allowing mechanical energy of about 0.1 to 30 kW · h / kg to act on clay;
(E) inorganic powder obtained by further heating the inorganic powder of (d) at 100 to 750 ° C., and (f) metakaolin,
Examples thereof include one or more inorganic powders selected from the group consisting of:

2. Alkali metal silicate (B) and water (C)
As one of the raw material components contained in the molding material according to the present invention, alkali metal silicate (B) is used.
Examples of the alkali metal silicate (B), the general _formula: M ₂ O · _nSiO 2 (where M is at least one selected Li, K, from Na, n represents a positive number The value of n is preferably in the range of 0.1 to 8, more preferably 0.5 to 3, particularly preferably 0.5 to 2.5. When the value of n is less than 0.1, the mechanical strength of the obtained inorganic molded body is low. On the other hand, when n is more than 8, the aqueous solution of alkali metal silicate is easily gelled and the viscosity increases rapidly. Therefore, mixing with the SiO ₂ —Al ₂ O ₃ based inorganic powder (A) may be difficult.

  In the addition of the alkali metal silicate (B) to the molding material, it is preferably added in advance after preparing an aqueous solution dissolved in water (C), which is essential in the production method of the present invention. . When the alkali metal silicate (B) is dissolved in water (C), viscosity is obtained and fluidity at the time of extrusion molding is secured. The concentration of the alkali metal silicate in the aqueous solution is not particularly limited, but when it becomes thin, the reactivity with the inorganic powder (A) decreases. It is necessary to be 1% by weight or more, and a range of 1 to 70% by weight is preferably used.

Further, in the preparation of the alkali silicate aqueous solution, the alkali metal silicate may be dissolved in water as it is. However, in the alkali metal hydroxide aqueous solution, n is set to a predetermined value for SiO ₂ components such as silica sand and silica stone powder. It may be dissolved as follows.

The amount of the alkali metal silicate (B) added is preferably 50 to 300 parts by weight with respect to 100 parts by weight of the SiO ₂ —Al ₂ O ₃ inorganic powder (A). The amount of the alkali metal silicate (B) added is less than 50 parts by weight with respect to 100 parts by weight of the SiO ₂ —Al ₂ O ₃ inorganic powder (A), and the SiO ₂ —Al ₂ O ₃ inorganic On the other hand, sufficient reaction with the powder (A) does not occur. On the other hand, if it exceeds 300 parts by weight, the alkali becomes excessive, the mechanical strength of the obtained inorganic molded product is lowered, and the durability is inferior.

The amount of water (C) added is preferably 50 to 500 parts by weight of water (C) with respect to 100 parts by weight of the SiO ₂ —Al ₂ O ₃ inorganic powder (A). That is, in the method for producing an inorganic molded body of the present invention, the blending ratio of the molding material is preferably the above alkali metal with respect to 100 parts by weight of the SiO ₂ —Al ₂ O ₃ inorganic powder (A). It is 50-300 weight part of silicate (B), and 50-500 weight part of water (C). By using this blending ratio, it is possible to easily conform to the mold after extrusion, and to obtain a product having high strength and durability.

3. Fiber (D)
A fiber (D) is used as one of the essential raw material components contained in the molding material according to the present invention. By blending this fiber (D), it is possible to improve the mechanical strength of the inorganic molded body or prevent the occurrence of cracks.
As such fiber (D), any fiber can be used depending on the performance to be imparted to the inorganic molded body. For example, organic fibers such as vinylon, polypropylene, polyamide, polyester, aramid, acrylic and rayon, carbon Inorganic fibers such as glass, potassium titanate, alumina, steel, and slag wool can be used.

  If the fiber thickness (fiber diameter) is too thin, it re-aggregates during mixing and fiber balls are easily formed by entanglement, and the strength of the finally obtained molded product is not improved any further and is too thick. If it is too short or too short, the reinforcing effect such as improvement in tensile strength is small, and if too long, the dispersibility and orientation of the fiber may be lowered. Therefore, the fiber diameter is preferably 1 to 500 μm and the fiber length is 1 to 15 mm. .

The addition amount of the fiber (D) is preferably 1 to 20 parts by weight of the fiber (D) with respect to 100 parts by weight of the SiO ₂ —Al ₂ O ₃ inorganic powder (A). If the added amount of the fiber is less than 1 part by weight, the reinforcing effect of the fiber is small, and even if the fiber is oriented, the effect is hardly changed. On the other hand, if it exceeds 20 parts by weight, the fluidity of the molding material is deteriorated. After molding, the molding material does not fit into the mold and is inferior in appearance.

4). Other Components of Molding Material As described above, the molding material according to the present invention includes SiO ₂ —Al ₂ O ₃ inorganic powder (A), alkali metal silicate (B), water (C) and fiber (D). Inorganic filler (E) can be added as necessary.
The inorganic filler (E) is not particularly limited. For example, silica sand, silica powder, crystalline alumina, fly ash, alumina, mica, diatomaceous earth, mica, rock powder (shirasu, anti-fluorite, etc.), basalt Various minerals such as feldspar, wollastonite, clay, bauxite, sepiolite, fiber material, and the like can be used.
These fillers are appropriately selected according to the use of the inorganic molded body, and can be used alone or in combination.

The addition amount of the inorganic filler (E) is not particularly limited, and is preferably 50 to 700 parts by weight with respect to 100 parts by weight of the SiO ₂ —Al ₂ O ₃ based inorganic powder (A). -500 weight part is more preferable. That is, if the addition amount of the inorganic filler is less than 50 parts by weight, the volume shrinkage of the molded body due to the dehydration condensation polymerization reaction of silicate ions cannot be sufficiently prevented, whereas if the addition amount exceeds 700 parts by weight, the machine of the molded body This is because the mechanical strength decreases.

In the molding material according to the present invention, an organic or inorganic foam (F) can be used as necessary for the purpose of reducing the weight of the material.
Examples of the organic foam include granular foams of synthetic resins such as vinyl chloride, phenol, urea, styrene, urethane, and ethylene. Examples of inorganic foams include glass balloons, shirasu balloons, fly ash balloons, silica balloons, perlite, leechite, and granular foamed silica. These organic and inorganic foams may be used alone or in combination.

0.01-1 are preferable and, as for specific gravity of said foam (F), 0.03-0.7 are more preferable. If the specific gravity is less than 0.01, the mechanical strength of the molded article may be reduced. On the other hand, if the specific gravity exceeds 1, the effect of reducing the weight cannot be obtained.
The amount of the foam (F) added is preferably 10 to 100 parts by weight and more preferably 30 to 80 parts by weight with respect to 100 parts by weight of the SiO ₂ —Al ₂ O ₃ inorganic powder (A). . If the added amount of the foam is less than 10 parts by weight, the effect of reducing the weight cannot be obtained, while if it exceeds 100 parts by weight, the mechanical strength may be lowered.

  If necessary, a foaming agent (G) may be further added to the molding material according to the present invention. Examples of the foaming agent (G) include peroxides such as hydrogen peroxide, sodium peroxide, potassium peroxide, and sodium borate, Mg, Ca, Cr, Mn, Fe, Co, Ni, Cu, Zn, Al, Examples thereof include metal powders such as Ga, Sn, Si, and ferrosilicon. In view of price, safety, availability, and ease of mixing, among these foaming agents, Si powder, ferrosilicon powder, and aluminum powder are preferable.

The amount of the foaming agent (G) added is within a range of 0.15 parts by weight or less with respect to 100 parts by weight of the SiO ₂ —Al ₂ O ₃ inorganic powder (A). It is determined by the density (specific gravity) of the body. When the blending amount exceeds 0.15 parts by weight, the foaming gas becomes excessive and bubbles are broken to increase the water absorption rate, thereby causing a problem in durability.

  When hydrogen peroxide is used as the blowing agent (G), it is preferably used as an aqueous solution. The concentration of the aqueous hydrogen peroxide solution that can be used as the blowing agent is in the range of 0.5 to 35% by weight, preferably in the range of 1 to 25% by weight, and more preferably in the range of 5 to 15% by weight. When the concentration exceeds 35% by weight, foaming proceeds quickly, so that stable foaming cannot be achieved, and there is a risk in some cases. On the other hand, when the concentration is less than 0.5% by weight, the amount of water relative to the amount of hydrogen peroxide is too large. The viscosity may decrease and foaming may not be stable.

  When using metal powder as a foaming agent (G), it is preferable that the average particle diameter exists in the range of 1-200 micrometers. When the average particle size exceeds 200 μm, the reactivity decreases. On the other hand, when the average particle size is less than 1 μm, the dispersibility decreases, the reactivity increases, and foaming may become too fast.

5. Manufacturing method of inorganic molded body As described above, the manufacturing method of the inorganic molded body of the present invention includes SiO ₂ —Al ₂ O ₃ -based inorganic powder (A), alkali metal silicate (B), water (C) and From the molding material containing the fiber (D), an inorganic molded body is obtained through a mixing / kneading step (i), an extrusion / casting step (ii), a conforming step (iii), a curing step (iv), and a drying step (v). A method of manufacturing comprising:
In the extrusion / casting step (ii), while extruding the molding material, the extruded molding material is taken up on a mold that moves at substantially the same speed as the extrusion speed, so that the molding material is substantially uniformly formed on the mold. Cast and
Subsequently, in the conforming step (iii), the cast molding material is adapted to the mold.

First, the outline | summary of the manufacturing method of the inorganic molded object of this invention is demonstrated using drawing.
FIG. 1 is a process diagram showing an example of a method for producing an inorganic molded body of the present invention. In FIG. 1, there are the following steps.
(I) Mixing and kneading step: A step of mixing and kneading the raw material components of the molding material according to the present invention.
(Ii) Extrusion / casting step: A step of extruding / casting the mixed / kneaded product obtained in (i).
(Iii) Familiarization step: A step of fitting the molding material cast on the mold obtained in (ii) into the mold.
(Iv) Curing step: a step of curing the molded body obtained in (iii).
(V) Drying step: a step of drying the cured molded body obtained in (iv).

Below, the manufacturing method of the inorganic molded object of this invention is demonstrated in detail along each process.
(1) Mixing / kneading step (i)
This is a step of mixing and kneading the raw material components of the molding material according to the present invention.
The molding material is preferably SiO ₂ —Al ₂ O ₃ inorganic powder (A) 100 parts by weight, alkali metal silicate (B) 50 to 300 parts by weight, and water (C) 50 to 500 parts by weight. And 1 to 20 parts by weight of fibers (reinforcing fibers) (D).

In the mixing / kneading step (i), a predetermined amount of SiO ₂ —Al ₂ O ₃ inorganic powder (A), alkali metal silicate (B), water (C), and fiber (D) are used as molding materials. In addition to the above, if necessary, an inorganic filler (E), foam (F), or foaming agent (G) is further blended and mixed and kneaded to obtain a uniform mixture.

  The mixing / kneading method is not particularly limited, and any conventionally known mixer and kneader can be used. For example, a double-arm kneader, a pressure kneader, an Eirich mixer, a super mixer, a planetary mixer, a Banbury mixer, a continuous mixer, or a continuous kneader can be used.

(2) Extrusion / casting process (ii)
This is a step of extruding and casting the mixture / kneaded material of the molding material obtained in the mixing / kneading step (i).
In the present invention, as a method of extruding the mixture / kneaded material of the molding material, a screw type device called an extruder or a kneader is used, a uniaxial eccentric screw pump (Mono pump, etc.), a tube pump, a plunger pump, etc. Pumps used for transporting mortars are preferably used.

A die is attached to the tip of the extrusion device, and it is preferable to have a shape close to the shape of the mold. When the ratio of the cross-sectional area (S ₁ / S ₂ ) between the molding material inlet side (S ₁ ) and the outlet side (S ₂ ) of the die of the extrusion apparatus is 3 or more, this die is particularly a fiber (D). Is oriented in the flow direction, enabling effective fiber reinforcement.

  The extruded material is drawn onto a mold that moves at approximately the same speed as the extrusion speed. Usually, a formwork is arrange | positioned on the conveyor installed under the extrusion apparatus, and material is cast on a formwork substantially uniformly. At this time, it is preferable to synchronize the extrusion speed and the conveyor speed, or to determine the conveyor speed from the capability of the extrusion apparatus and to pour the material onto the mold.

(3) Familiarization process (iii)
In this step, the molding material cast on the mold obtained in the extrusion / casting step (ii) is adapted to the mold.
For molds cast with molding material, it is necessary to adapt the molding material to the mold. However, as a method of adapting the mold material, leveling by hand, putting a vibrator in the material and vibrating, vibrating the mold itself Or the like can be used. Among them, a method of applying vibration to the mold with a vibrator or the like is easy in terms of work procedures. Moreover, if a design mold is installed in the mold, a molded body such as an outer wall with the design can be obtained.
FIG. 2 is a schematic explanatory diagram illustrating the outline of the extrusion / casting step (ii) and the familiar step (iii).

(4) Curing process (iv)
In the present invention, the curing step (iv) is a step of curing the molded body obtained in the familiar step (iii). The mechanical properties can be improved by curing the molded body obtained in the familiar process by any conventionally known method such as heating and humidification.
The curing method is not particularly limited, and examples thereof include steam curing, wet heat curing, natural curing, and autoclave curing method. Specific curing conditions include, for example, curing for 6 hours at a temperature of 60 ° C. and a relative humidity of 95%.

(5) Drying step (v)
In the present invention, the drying step (v) is a step of drying the cured molded body obtained in the curing step (iv).
The drying method is not particularly limited, and a conventionally known method can be used. For example, hot air drying, natural drying, etc. are mentioned.
The inorganic molded body which concerns on this invention can be obtained from said manufacturing process.

  Hereinafter, the present invention will be described in more detail by way of examples and comparative examples of the present invention, but the present invention is not limited to these examples.

The raw materials used in the examples are as follows.
SiO ₂ —Al ₂ O ₃ -based powder 1: Metakaolin “SATINTONE SP 33” (average particle size 3.33.3 μm, specific surface area 13.9 m ² / g) manufactured by Engelhard, Inc. manufactured by Makino Corporation A ball mill “BM150” (alumina balls 10 mmφ used, ball filling rate 60%, metakaolin mixing amount 30 kg) was subjected to mechanical energy of 0.3 kWh / kg for 6 hours to grind the average particle size to 1.5 μm. thing.
SiO ₂ -Al ₂ O ₃ -based powder 2: corundum production of furnace filter dust.
Fine silica sand: made by Sumitomo Cement, having a brain value of 5000 cm ² / g.
Fiber 1: Vinylon fiber, “RM182” manufactured by Kuraray Co., Ltd., having a length of 9 mm and a diameter of 14 μm.
Fiber 2: Polypropylene fiber, “C-12EX” manufactured by Tezak Co., Ltd., having a length of 12 mm.
Alkali metal silicate aqueous solution: An aqueous solution obtained by adding an alkali metal silicate to a predetermined amount of water, wherein K ₂ O: SiO ₂ has a molar ratio of 1: 1.4, and the aqueous solution of the alkali metal silicate Concentration at 45% by weight.
Foaming agent: silicon powder, manufactured by Toho Zinc Co., Ltd. with a silicon content of 93% and an average particle size of 6 μm.

[Examples 1-8, Comparative Examples 1-8]
First, the formulation of the molding materials shown in Table 1 was fed to Aiko house made of ACM mixer, and mixed for 5 minutes, the mixture was prepared.
Next, the mixture obtained by mixing was extruded apparatus 1: Continuous vacuum extruder “FM-100” manufactured by Miyazaki Tekko (die outlet cross section having a width of 100 mm, thickness of 10 mm, inlet / outlet cross section ratio of 7.9). ) And extrusion device 2: MONO PUMP "NES30 type" (mold outlet cross section 100mm wide, thickness 10mm, inlet / outlet cross sectional area ratio 5.0) manufactured by Hyojin Equipment, and formwork [width 100mm, Cast on a length of 600 mm and a thickness of 10-20 mm (see Table 1)]. The extruded material was given an amplitude of 10 mm in the flow direction and transverse vibration for 3 minutes, then sealed and allowed to stand for 3 hours, and then cured and cured in an oven at 85 ° C. for 6 hours to obtain a cured product.
Finally, the obtained cured product was dried at 50 ° C. for 5 hours to obtain a product.

Moreover, in the comparative example, it manufactured by the completely same method as an Example except not having passed through the extrusion process and casting the mixed material directly to the mold.
Evaluation of the obtained product was performed on a test piece left for 24 hours in an air-dried state with a span of 400 mm, a width of 100 mm, bending strength in the extrusion flow direction at 3 points, and a load speed of 0.5 mm / min. The stress was taken as the bending strength. Table 1 shows the results and the formulation of the molding material.
In Examples 1 to 8, although the extrusion apparatus 1 was used, it has been confirmed that the same result is obtained with the extrusion apparatus 2 (the bending strength is hardly changed).

  As is clear from Table 1, it can be seen that in Examples 1 to 8, all are superior in bending strength to Comparative Examples 1 to 8.

  According to the method for producing an inorganic molded body of the present invention, an inorganic molded body having excellent strength can be obtained. Therefore, it can use suitably for building materials, such as a flooring material, an inner wall material, an outer wall material, and a roof material.

It is process drawing showing an example of the manufacturing method of the inorganic molded object of this invention. It is a schematic explanatory drawing explaining the outline | summary of an extrusion / casting process (ii) and a familiar process (iii).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Extruder 2 Base 3 Molding material 4 Formwork 5 Conveyor 6 Vibrator

Claims (3)

SiO ₂ -Al ₂ O ₃ -based inorganic powder (A), a molding material containing an alkali metal silicate (B), water (C) and fiber (D), mixing and kneading step (i), an extrusion-casting A method for producing an inorganic molded body through the step (ii), the familiar step (iii), the curing step (iv) and the drying step (v),
The blending ratio of the molding material is 50 to 300 parts by weight of alkali metal silicate (B) and 50 to 500 parts by weight of water (C) with respect to 100 parts by weight of SiO ₂ —Al ₂ O ₃ inorganic powder (A). Part and fiber (D) 1-20 parts by weight,
In the extrusion / casting step (ii), when extruding the molding material, the ratio of the cross-sectional area between the molding material inlet side and the outlet side of the mold of the extrusion apparatus is 3 or more,
In the extrusion / casting step (ii), while extruding the molding material, the extruded molding material is taken up on a mold that moves at substantially the same speed as the extrusion speed, so that the molding material is substantially uniformly formed on the mold. Cast and
Subsequently, in the conforming step (iii), a method for producing an inorganic molded body, wherein the cast molding material is conformed to the mold. The method for producing an inorganic molded body according to claim 1 , wherein in the conforming step (iii), the molding material is adapted to the mold by applying vibration to the mold. The inorganic material according to claim 1 or 2 , wherein the molding material further contains at least one of an inorganic filler (E), an organic / inorganic foam (F), and a foaming agent (G). Manufacturing method of a molded object.