JP2879378B2 - Composition for inorganic molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composition for an inorganic molded article which is useful, for example, as a non-combustible building material and can form an inorganic molded article in a short time.

[0002]

2. Description of the Related Art In general, inorganic moldings are extremely useful as non-combustible building materials, for example, for inner and outer wall materials, and conventionally comprise an alkali metal silicate aqueous solution, a finely divided inorganic solid component and a filler. Compositions for inorganic moldings are already known.

[0003]

However, the conventional composition for an inorganic molded article has a characteristic that the reaction proceeds by self-heating and cures. However, it is one of the main components of the composition for an inorganic molded article. Depending on the type of finely divided inorganic solid component, the reactivity is not high, and depending on the environmental conditions in the curing reaction process, the reaction heat is taken away, and the curing time is long unless the heat is supplemented by heating from the outside. Not only
There is a problem that the curing reaction becomes insufficient and the strength of the molded body, particularly the bending strength, is reduced.

[0004] Of course, the above problem can be solved to some extent by heating from the outside during the curing reaction. However, since extra steps and equipment and work are required, it is not only uneconomical, but There was a problem that it was not possible to further shorten the time and improve the productivity.

The inventor of the present invention has conducted intensive studies in order to solve the above-mentioned problems. As a result, he has found that in order to promote the curing reaction, it is only necessary to add a heat-producing curing accelerator. Was completed.

An object of the present invention is to increase the reactivity of a composition, to have a high bending strength, and to form an inorganic molded article suitable for use as a non-combustible building material inside and outside wall material. To provide a composition for use.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an aqueous alkali metal silicate solution of 20 to 7 times.
A composition for an inorganic molded article comprising 100 parts by weight of a main material comprising 0 parts by weight, 15 to 70 parts by weight of an inorganic solid component, and 10 to 65 parts by weight of a filler, and 0.1 to 10 parts by weight of calcium oxide. And

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

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, each 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 inorganic solid component includes _{2 to} 98% by weight of amorphous SiO _{2 and} 98 to ₂ % by weight of Al ₂ O _3.
An oxidation mixture containing is used.

As such an oxidized mixture, for example, metakaolin, dust generated during the production of corundum or mullite, pulverized and fired bauxite, fly ash and the like can be used.

For example, dust from a corundum furnace contains at least 50% by weight of an oxidized mixture of 20 to 80% by weight of amorphous SiO _{2 and} 80 to 20% by weight of Al ₂ O ₃ , and the remainder is Fe ₂ O ₃ , TiO _{2 and the} like.

The filler may be an inorganic substance in the form of pulverized or finely divided form such as rock powder, basalt, mica, silica sand, glass powder, alumina, aluminum hydroxide, talc, calcium carbonate, kaolin and other clays, and fiber materials. , And other various inert or water-insoluble minerals can be used. These fillers are appropriately selected according to the use of the inorganic molded article, and are used alone or in combination.

By the way, calcium oxide as a hardening accelerator in the present invention is generally called quick lime. In this case, in particular, in this case, the powder is in the form of powder and has a particle size of about 20 μm.
Those having a thickness of 0 μm or less are more effective.

The mixing ratio of the composition for an inorganic molded article of the present invention is 100 to 100 parts by weight of a base material comprising 20 to 70 parts by weight of an aqueous solution of an alkali metal silicate, 15 to 70 parts by weight of an inorganic solid component, and 10 to 65 parts by weight of a filler. Parts by weight and calcium oxide
1 to 10 parts by weight.

Here, the mixing ratio of the alkali metal silicate aqueous solution, the inorganic solid component and the filler, which are the main materials of the inorganic molded article, is appropriately determined according to the required physical properties of the inorganic molded article and its use. .

The amount of calcium oxide added as a curing accelerator is 0.1 to 100 parts by weight of the main material of the inorganic molded article.
If the amount of calcium oxide is less than 0.1 part by weight, sufficient heat generation does not occur, so that the hardening promoting effect cannot be obtained. If the amount of calcium oxide exceeds 10 parts by weight, rapid heat generation occurs. Occurs, and the viscosity of the composition for an inorganic molded article becomes excessively high, so that the composition cannot be sufficiently kneaded and a homogeneous inorganic molded article cannot be formed. The curing time of the inorganic molded article can be arbitrarily adjusted by changing the amount of calcium oxide added within the above range.

In the present invention, an appropriate amount of an aqueous solution of an alkali metal silicate, an inorganic solid component, a filler, and a curing accelerator, as well as pigments and other additives can be added as needed.

From the composition for an inorganic molded article according to the present invention,
In order to produce an inorganic molded article, first, a solid component in the composition, an inorganic solid component, a filler, calcium oxide, and, if necessary, an appropriate amount of a pigment and the like are added and mixed. An aqueous alkali metal silicate solution as a component is added and kneaded until the solid component is sufficiently dispersed.

The thus obtained kneaded material for an inorganic molded body is then poured into a predetermined mold, and at room temperature if necessary.
The reaction is cured for 10 minutes to 3 hours while heating in the range of 0 to 100 ° C. to form an inorganic molded body having a predetermined shape.

[0021]

According to the composition for an inorganic molded article, a predetermined amount of calcium oxide is added as a hardening accelerator to a main material of an inorganic molded article comprising an aqueous solution of an alkali metal silicate, an inorganic solid component and a filler. In addition, the curing reaction is accelerated, and the temperature of the composition for an inorganic molded body can be increased to form the inorganic molded body in a short time.

[0022]

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

Examples 1 to 6 19.1% by weight of K ₂ O, 24.9% by weight of SiO ₂ ,
And an alkali metal silicate aqueous solution (A) having a composition of 56.0% by weight of H ₂ O, corundum furnace dust (B) or metakaolin (C) as an inorganic solid component, and an average particle diameter (φ) of 200 μm as a filler. Of the main material consisting of silica sand (D) and silica sand powder (E) having an average particle diameter (φ) of 30 μm, a particle diameter (φ) of 1 as a hardening accelerator.
Calcium oxide (C) having 80% of particles of 50 μm or less
aO) and (F) were prepared in the proportions shown in Table 1 for each example.

The corundum furnace dust (B) is composed of 50% by weight of amorphous SiO _2, 25% by weight of Al ₂ O ₃ ,
The balance consists of Fe ₂ O ₃ and TiO ₂ .

First, for each example, the inorganic solid component (B) or (C), fillers (D) and (E), and calcium oxide (CaO) (F) were placed in a container,
The mixture was mixed using a hand mixer, and then an aqueous solution of an alkali metal silicate (A) was added and kneaded sufficiently. After that, the kneaded material is sized to 120 mm (length) x 15 mm (width) x 1
Inject into a 0 mm (height) silicone rubber mold, temperature 8
The composition was allowed to stand in a 5 ° C. oven to cure the inorganic molded body composition.

After the obtained inorganic molded article was further dried in an oven at 110 ° C. for 2 hours, the curing time and the flexural strength were evaluated. The results obtained are summarized in Table 1.

The curing time was defined as the time at which the value obtained when measuring the bending strength no longer increased.

Comparative Examples 1-2 For comparison, the alkali metal silicate aqueous solution (A) used in the examples, corundum furnace dust (B) as an inorganic solid component, and silica sand (D) as a filler were used. Main material 10
With respect to 0 parts by weight, a particle size (φ) of 150 is used as a curing accelerator.
Calcium oxide (Ca) in which 80%
O) and (F) were prepared at the compounding ratios shown in Table 1 for each comparative example.

The operations of mixing and kneading the components in each comparative example were performed in exactly the same manner as in the examples. Here, with respect to the kneading of Comparative Example 2, the inorganic molding was performed in the same manner as in Example except that the temperature of the kneaded material rapidly increased, the viscosity was remarkably increased, and the kneading could not be performed. The body was obtained and the cure time, density and flexural strength were measured. The obtained results are shown in Table 1.

[0030]

[Table 1]

As is evident from the results in Table 1, according to the inorganic compositions for inorganic moldings of Examples 1 to 6 of the present invention, the curing time was shorter than that of the comparative example. Further, the composition for an inorganic molded article of the present invention had higher flexural strength than the comparative example.

[0032]

The composition for an inorganic molded article according to the present invention comprises:
As described above, 20 to 70 parts by weight of the aqueous alkali metal silicate solution, 15 to 70 parts by weight of the inorganic solid component, and the filler 1
100 parts by weight of the main material consisting of 0 to 65 parts by weight, and 0.1 to 10 parts by weight of calcium oxide. According to the composition for an inorganic molded article of the present invention, the curing reaction is promoted, A compact can be formed in a short time, and its productivity can be improved. Moreover, since it has a high bending strength, it has an effect that it is extremely useful, for example, as a nonflammable building material.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI C04B 22:06)

Claims (1)

(57) [Claims] 1. An aqueous alkali metal silicate solution of 20 to 70 parts by weight, an inorganic solid component of 15 to 70 parts by weight, and a filler 1
A composition for an inorganic molded body, comprising 100 parts by weight of a main material comprising 0 to 65 parts by weight and 0.1 to 10 parts by weight of calcium oxide.