JPH054849A - Inorganic composition for producing non-combustible inorganic molding - Google Patents

Abstract

PURPOSE:To provide an inorganic composition capable of producing a sufficiently hardened high-quality inorganic molding extremely useful for inner and outer wall materials as an incombustible and smokeless building material by stabilizing reactivity of finely granulated inorganic material comprising silica sand, fly ash, burned bauxite, etc., to increase activity of the inorganic material. CONSTITUTION:An inorganic composition for producing incombustible inorganic molding comprising an aqueous solution of an alkali metal silicate, an inorganic solid component and a filler. Finely granulated inert or active inorganic material the surface of which is coated with an active component composed of alumina sol and/or silica sol is used as the inorganic solid component.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inorganic composition used for producing an inorganic molded article useful as a nonflammable building material.

[0002]

2. Description of the Related Art Generally, an inorganic molded article is extremely useful as a non-combustible and smoke-free building material, for example, as an interior / exterior wall material. An inorganic composition for producing a non-combustible inorganic molded article is already known.

[0003]

In such a conventional inorganic composition for producing a non-combustible inorganic molded article, as the finely powdered inorganic material, an oxidized mixture of amorphous silicon oxide and alumina oxide is used. For example, metakaolin, ash of the electrostatic precipitator generated during the production of corundum or mullite, pulverized and baked bauxite, fly ash, etc. are known, but these components have variations in reactivity during molding, Since the activity is not constant, there is a problem that a sufficiently cured inorganic molded article cannot be obtained.

The inventors of the present invention have conducted extensive studies in order to solve the above problems, and as a result, in order to stabilize the reactivity and enhance the activity of the finely divided inorganic substance, an inactive or small finely divided inorganic substance is required. By coating the active ingredient on the surface of, it is possible to form a stable reactive inorganic solid component, and using such a reactive inorganic solid component together with an alkali metal silicate aqueous solution and a filler,
It was found that a sufficiently cured inorganic molded body was obtained, and the present invention was completed.

The object of the present invention is to stabilize the reactivity of the finely divided inorganic substance and enhance its activity, and to obtain a fully cured quality which is extremely useful as an interior / exterior wall material as a non-combustible and smokeless building material. An object is to provide an inorganic composition capable of producing a good inorganic molded body.

[0006]

In order to achieve the above object, the present invention provides an inorganic composition comprising an alkali metal silicate aqueous solution, an inorganic solid component and a filler, wherein the inorganic solid component is inert or The inorganic composition for producing a non-combustible inorganic molded article is characterized in that the surface of a finely powdered inorganic material having small activity is coated with an active ingredient consisting of at least one of alumina sol and silica sol. .

In the above, as the alkali metal silicate aqueous solution, an aqueous solution of potassium silicate, sodium silicate, or a mixture thereof is used.

The composition of such an aqueous solution is SiO ₂ and K
₂ O, SiO ₂ and Na ₂ O, or SiO ₂ and K ₂ O +
Na ₂ O having a molar ratio of 1.0 to 3.0
And the concentration of the aqueous solution is preferably in the range of 30 to 60%.

The finely divided inorganic substance as the inorganic solid component may be inactive at all, or may be ineffective even if it is active, so that it may be difficult to use it alone.
Examples of inactive finely divided inorganic substances include silica sand, alumina, kaolin, calcium carbonate, talc, mica, aluminum hydroxide, glass powder and the like. In addition, as an example of a finely powdered inorganic material having small activity, fly ash,
Examples include calcined kaolin, calcined bauxite, and ash of an electrostatic precipitator generated during the production of corundum or mullite.

Generally, the smaller the particle size of the finely divided inorganic substance, the better, but if it is too small, the coating of the active ingredient tends to be non-uniform, so about 0.1 to 100 μm,
It is preferably about 0.2 to 50 μm.

The active ingredient coated on the surface of such an inactive or small active finely divided inorganic material is
Alumina sols and / or silica sols can be used.

Here, the alumina sol may be any of Al ₂ O _{3 having} a crystal system of alumina hydrate, and the particle shape thereof may be feather-like, plate-like, rod-like or granular.
The dispersion liquid of alumina sol is an aqueous solution having acidity to which any one of hydrochloric acid, acetic acid, and nitric acid is added as a stabilizer.

The silica sol has a SiO ₂ particle size of 0.2.
Those of μm or less are applied. When used alone, the liquid phase is an aqueous solution that exhibits either acidity or basicity.

When the alumina sol and the silica sol are used in combination, the dispersion liquid is acidic and the ratio of the Al ₂ O ₃ substance to the SiO ₂ substance is 20% by weight or more.

The surface of an inactive or small active finely divided inorganic material is coated with an active ingredient consisting of at least one of alumina sol and silica sol,
In order to form the inorganic solid component, while stirring the finely powdered inorganic substance contained in a predetermined container, a predetermined amount of an aqueous solution of alumina sol and / or silica sol is coated by a spray method, and the content is taken out and heated at about 100 ° C. After drying by warming and crushing the obtained lump, about 300 to 800
It is baked at a temperature of ° C.

Here, the amount of the active ingredient added is determined by the particle size of the inert fine powder. That is, the smaller the particle size of the powder, the larger the appropriate amount of addition, but generally about 5 to 20.
Weight percent is preferred.

As the above-mentioned filler, crushed or finely divided inorganic substances such as rock powder, basalt, feldspar, mica, silica sand, glass powder, alumina, aluminum hydroxide, talc, fiber material, other inert or Various water-insoluble minerals can be used. These fillers are appropriately selected according to the use of the inorganic molded body, and independently,
Alternatively, they are used as a mixture.

The mixing ratio of each component of the above-mentioned inorganic composition for producing a non-combustible inorganic molded article is 100 parts by weight of an inorganic solid component obtained by coating an active component on the surface of a finely powdered inorganic substance which is inactive or small in activity. Metal silicate solution 4
It is preferably in the range of 0 to 100 parts by weight and the filler of 10 to 30 parts by weight, and the specific blending thereof is arbitrarily determined according to the molding method or application of the inorganic molded body.

In order to produce a non-combustible inorganic molded article from the above-mentioned inorganic composition, first, an inorganic solid component obtained by coating an active component on the surface of an inactive or small active finely divided inorganic substance, a filler, and, if necessary, an appropriate amount of A pigment or the like is added and mixed, and then an aqueous solution of an alkali metal silicate, which is a liquid component, is added thereto, and they are kneaded until they are sufficiently dispersed. Then, this kneaded product is poured into a predetermined mold,
By heating in an oven at 95 ° C for 1 to 4 hours,
The inorganic composition is cured to obtain an inorganic molded body having a predetermined shape.

[0020]

According to the above-mentioned inorganic composition for producing a non-combustible inorganic molded article, the inorganic solid component is a finely powdered inorganic substance which is inactive or has a small activity, and the surface of which is coated with an active component consisting of alumina sol and / or silica sol. Therefore, it is possible to stabilize the reactivity of the finely powdered inorganic substance, enhance its activity, and produce a sufficiently cured inorganic molded product of good quality.

[0021]

EXAMPLES Next, examples of the present invention will be described together with comparative examples.

Example 1 100 parts by weight of silica sand powder having an average particle size of 3 μm as a finely divided inorganic substance was placed in a rotary kneader, and while stirring this, an alumina sol containing 10% by weight of Al ₂ O ₃ as an active ingredient was prepared by a spray method. After coating the aqueous solution with 50 parts by weight of alumina sol, the contents are taken out and
It was dried at 10 ° C. and the obtained lump was crushed. Then 3
It was fired at 00 ° C. for 2 hours to obtain a reactive inorganic solid component A.

As shown in Table 1 below, 100 parts by weight of the reactive inorganic solid component A and silica sand 15 as a filler are used.
After mixing parts by weight, SiO ₂ per mol of K ₂ O
₂ Potassium silicate aqueous solution with a concentration of 53% containing 1.6 mol 6
6 parts by weight were added, and these were sufficiently kneaded by using an ordinary mixer.

The kneaded product is then plated on the inner wall and the internal dimensions are 10 mm in length × 15 mm in width × 150 in height.
It was poured into a mold having a size of mm and heated in an oven at 85 ° C. for 4 hours. The content thus obtained was a sufficiently cured inorganic molded body.

The above-mentioned inorganic molded body was further dried in an oven at 110 ° C. for 2 hours, and the cured state and bending strength of the obtained inorganic molded body were measured. The results are summarized in Table 1. .

Example 2 100 parts by weight of fly ash having an average particle diameter of 15 μm as a finely divided inorganic substance was put into a rotary kneader, and while stirring this, Al ₂ O ₃ 10 as an active ingredient was sprayed by a spray method.
After coating a mixed aqueous solution of alumina sol of 20% by weight with silica sol of 20% by weight of SiO _{2 so as to} have 50 parts by weight of alumina sol and 25 parts by weight of silica sol, the contents were taken out, and the same procedure as in Example 1 was performed. Thus, a reactive inorganic solid component B was obtained.

Then, this reactive inorganic solid component B was blended according to the blending ratio shown in Table 1, and an inorganic molded body was manufactured in the same manner as in the case of Example 1 above. Then, the cured state and the bending strength of the obtained inorganic molded body were measured in the same manner, and the results are also shown in Table 1.

Example 3 100 parts by weight of calcined bauxite having an average particle size of 25 μm as a finely divided inorganic substance was put into a rotary kneader, and while stirring this, SiO ₂ 20 as an active ingredient was prepared by a spray method.
Example 1 above, except that a 60% by weight silica sol was coated with a 60% by weight silica sol aqueous solution, and then the contents were taken out and baked at 250 ° C. for 90 minutes.
In the same manner as in the above, a reactive inorganic solid component C was obtained.

Then, the reactive inorganic solid component C was mixed in the mixing ratio shown in Table 1 (90% for potassium silicate aqueous solution).
Incorporation was carried out according to (addition of parts by weight), and an inorganic molded article was produced in the same manner as in Example 1 above. Then, the cured state and the bending strength of the obtained inorganic molded body were measured in the same manner, and the results are also shown in Table 1.

Comparative Examples 1 to 3 For comparison, the finely divided inorganic substances of Examples 1 to 3 above, that is, silica sand powder, fly ash, and calcined bauxite, were used as they were without activating the components, The mixing ratio, kneading, molding, drying, and firing of
In the same manner as in the case of 3, three kinds of inorganic molded bodies for comparison were manufactured. The cured state and bending strength of the obtained inorganic molded body were measured in the same manner, and the results are also shown in Table 1.

Here, the cured state and bending strength of the inorganic molded body were measured as follows. That is, the inorganic molded body is placed between the two fulcrums with a space of 100 mm with the thickness direction vertical, and a load is applied to the midpoint between the two fulcrums, and the bending state at that time is visually observed to make the inorganic molding. The hardened state of the body was determined. The stress was measured and used as the bending strength of the inorganic molded body. The cured state of the inorganic molded body was ◯: no bending was observed until the molded body was broken, and x: the same bending was recognized.

[0032]

[Table 1]

As is clear from the results shown in Table 1 above, according to the inorganic compositions of Examples 1 to 3 of the present invention, the inorganic solid component was such that an alumina sol, Or, since the one coated with the active ingredient consisting of alumina sol and silica sol is used, the reactivity of the finely divided inorganic substance is stable and its activity is enhanced, so that the cured state is extremely good and the bending strength is very high. It was possible to obtain a high-quality inorganic molded body.

On the other hand, in the inorganic molded articles of Comparative Examples 1 to 3 which were used as they were without activating the surface of the finely divided inorganic material, the cured state was poor except for Comparative Example 2, and In the case of Comparative Example 2, the bending strength of the obtained inorganic molded body was not sufficient, and this could not be sufficiently used as a nonflammable building material.

[0035]

As described above, in the inorganic composition for producing a nonflammable inorganic molded article according to the present invention, the inorganic solid component comprises an alumina sol and / or a silica sol on the surface of an inert or small pulverized inorganic material. Since the active ingredient is coated, the reactivity of the finely powdered inorganic material can be stabilized and its activity can be enhanced, whereby a sufficiently cured good quality inorganic molded article can be produced. The inorganic molded body obtained by the inorganic composition of can faithfully reproduce the surface of the mold, has an extremely good appearance, and is extremely suitable for interior and exterior wall materials as a nonflammable and smokeless building material. Has the effect of being useful.

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Claims (2)

[Claims] 1. An inorganic composition comprising an aqueous alkali metal silicate solution, an inorganic solid component, and a filler, wherein the inorganic solid component is at least on the surface of an inactive or small pulverized inorganic substance, and at least one of alumina sol and silica sol. An inorganic composition for producing a nonflammable inorganic molded article, characterized by being coated with an active ingredient consisting of one component. 2. Finely powdered inorganic matter as an inorganic solid component is silica sand, alumina, kaolin, calcium carbonate, talc, mica,
The at least one substance selected from the group consisting of aluminum hydroxide, glass powder, ash of an electrostatic precipitator generated during the production of corundum or mullite, fly ash, calcined kaolin, and calcined bauxite. An inorganic composition for producing a nonflammable inorganic molded article.