JPH01131046A - Inorganic binder - Google Patents

Abstract

PURPOSE:To provide an inorganic binder showing hydraulic properties with a small amount of water, supplying a set material having heat resistance, exhibiting ceramic properties, by blending specific fine powder of calcium silicate containing a boron component with fine power of active silica. CONSTITUTION:Fine powder of calcium silicate comprising crystalline fine powder which has 1.3-3 basicity shown by the formula (M is alkali metal), contains 0.1-5wt.% calculated as B2O3 boron component and preferably further 3-10wt.% calculated as fluorine of a fluorine component and has 15,00-10,000m<2>/g Blaine specific surface area of cooled molten material is prepared by a method of adding a boron-containing material and a fluorine- containing material to a molten material of steel manufacturing slag to modify the molten material. 100pts.wt. fine power of silicate calcium is blended with about 5-50pts.wt. fine powder of active silica (e.g., ferrosilicon dust) to give an organic binder suitable for building material, having both excellent cementing properties and ceramic properties.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an inorganic binder. More specifically, the present invention relates to an inorganic binder containing boron component-containing calcium silicate fine powder and activated silica fine powder, which is a characteristic inorganic binder having both hydraulic properties and ceramic properties.

[Prior art] Various metallurgical slags such as blast furnace slag, ferroalloy slag, and metal magnesium slag have basic calcium silicate as their main composition, and their powders, especially granulated slag powders, have latent hydraulic properties. Therefore, it is well known that it is used as a cement material, typified by blast furnace cement.

However, since such slag itself usually has a slow hydraulic reaction, it is not currently put to practical use alone.

Therefore, when such slag is used as a cement material, it must be used together with cement such as Portland cement or alumina cement, or with quicklime, slaked lime, alkaline irritants such as alkali metal compounds, gypsum, calcium chloride, sulfates, and other auxiliary agents. A wide variety of cement compositions have been proposed and put into practice.

[Problems to be Solved by the Invention] Conventionally, in the use of typical blast furnace slag as a cement material, cement compositions in which the slag is used in combination with other components often have drawbacks due to the combination of - In terms of numbers, there are fewer distinctive features compared to Portland cement.
Performance is also poor.

By the way, the present inventors have found that, in connection with the so-called pulverization problem of steelmaking slag, there is a significant modification of the slag by adding boron-containing glass to the molten slag for the purpose of modifying the slag. He succeeded in paving the way for its use in cement (Patent Application No. 312481-1981).

However, the hydraulic properties of this material are insufficient in terms of strength and must be improved.

Furthermore, although the development of cement materials by modifying slag is the most desirable from an economic standpoint, due to the inevitable reasons in the process, significant variations in composition occur, making it impossible to obtain a cement material with a stable composition. There are drawbacks.

[Means for solving the problem] In view of the soft soil, we were earnestly researching the hydraulic properties of calcium silicate fine powder containing a boron component in order to further improve it, and found a composition in which activated silica fine powder was blended with it. The present invention was completed based on the discovery that the fire resistance as well as the hydraulic properties of the product were significantly improved.

That is, the basicity of the present invention is -5Fo9+"*"Kenkan+'p,3"quantity ratio) (in the formula, M represents an alkali metal) of 1.3 to 3.0.
and the boron component is 0.1 to 5 in terms of B2o3.
．． The present invention relates to an inorganic binder characterized by comprising 0% by weight of calcium silicate-based fine powder and activated silica fine powder.

[Function] The calcium silicate fine powder, which is one of the components of the inorganic binder according to the present invention, contains a boron component, and it is important that it has the above composition, and has hydraulic properties by itself. It is.

Such a fine powder is advantageously modified by adding a boron-containing substance to a molten material such as steelmaking slag, but its composition must have the above-mentioned basicity.

Moreover, in the present invention, it is not related to modified slag, but may be a composite having the above composition.

That is, a material containing calcium, a silicic acid material, a boron-containing material, alumina, magnesia, and a fluorine-containing material is melted in a predetermined composition, then cooled and pulverized.

As described above, the history of calcium silicate-based fine powder must be that of a molten body, and a thermal history comparable to that of a sintered body is not appropriate.

Furthermore, after melting, it must be slowly cooled to form a fine powder and crystalline.

In this way, if the basicity is outside the range defined above, hydraulic properties will not develop, and even if they develop, they will be insufficient and have no strength, and will lack practicality, as well as fire resistance if they are not crystalline. Lacks sex.

In addition, as the modified slag powder, for example, steel manufacturing slag such as stainless steel, ferrochrome slag, etc. are suitable, but
It is not limited to these.

In addition to the above-mentioned basicity, it is particularly recommended that the calcium silicate-based fine powder contains a boron component of 0.1 to 5% by weight as B203, and more preferably a fluorine component of 3 to 10% by weight as F.

Even if the boron content is small, it significantly modifies the physical properties of calcium silicate and is essential for improving the physical properties such as hydraulic properties and fire resistance, but if the boron content is outside the above range, the modification is insufficient. Otherwise, it is unsuitable because it adversely deteriorates the fire resistance.

Therefore, in many cases the boron content is 0 as B 20 s.
．． A range of 3 to 1% by weight is most preferred.

As described above, one of the features of the present invention is that one component of the binder is a material obtained by modifying a highly basic calcium silicate material by containing a small amount of boron component in a uniform structure. It has become.

In general, highly basic calcium silicate causes a powdering phenomenon when slowly cooled, as seen in molten slag, but when it is modified with a boron component, this phenomenon is inhibited, and at the same time, hydraulic properties occur and the modification occurs. The effect can be recognized.

The above calcium silicate-based fine powder may have a Blaine specific surface area of 1,500 to 10,000 m2/!, but in most cases it has a Blaine specific surface area of 2,000 to 6,000 m2/! ? is practical and suitable.

Next, as another component of the inorganic binder according to the present invention, there is activated silica fine powder, which is essential for improving the physical properties of the binder.

Here, activated silica refers to a silica raw material that undergoes a neutralization reaction, the so-called hozolan reaction, with basicity components such as calcium in boron component-containing calcium silicate fine powder, such as ferrosilicon dust. , fumed silica, silica sol, activated clay, etc., and ultrafine powdered silica such as ferrosilicontaste and humed silica are particularly suitable.

The proportion of these two components needs to be determined depending on the intended use of the binder, the composition of the calcium silicate-based fine powder, the type of activated silica, etc. is in the range of 5 to 50 parts by weight, preferably in the range of 7 to 30% by weight.

Naturally, when using the binder according to the present invention, for example, sand, silica grains, waxite, crushed stone grains, refractory grains such as chamotte, aggregates such as coarsely crushed slag grains, carbon fibers, organic Desired reinforcing materials and molded bodies can be obtained by appropriately using various short fibers such as synthetic fibers and glass fibers or colorants.

Since the inorganic binder according to the present invention is hydraulic, in that sense it can be said to belong to the category of a type of cement, but unlike ordinary cement compositions,
- It does not require steam curing; it only needs to be cured in the air after hydraulic hardening and demolding, and the heat of hydration is also extremely small.

During hydraulic hardening, it is natural that the ratio of water to cement (w/c) is smaller, which is preferable for strength enhancement, but the material according to the present invention is characterized in that this w/c is smaller than that of ordinary cement. be. For example, the amount of water per 100 parts by weight of binder is suitably from 5 to 40 parts by weight, often from 6 to 25 parts by weight.

In addition, when kneading with water, a known dispersant or foaming agent commonly used in the case of cement can be used in combination, if necessary.

Surprisingly, since ordinary cement compositions are hydraulic binders, their strength deteriorates when heated, and they generally have no heat resistance, let alone so-called fire resistance. The binder is heat resistant and fire resistant, and when heated to around 1000°C, it has the property of improving strength rather than causing thermal deterioration.

Therefore, for example, a cured product using the binder according to the present invention may be
Products heated at temperatures between 00 and 1100°C can be thought of as being converted from hydraulic strength to sintering strength. For example, when a molded panel is struck, it produces a porcelain-like sound, which is why it is called ceramic. It can be said to be a unique inorganic binder that has both cementitious and ceramic properties.

[Example] Examples are given below to specifically explain the present invention, and all parts and percentages are by weight.

Himi 1■221 A composition containing a predetermined amount of modified stainless steel slag fine powder containing a boron component (Brain specific surface area 3000 m2/y) shown in Table 1 and ferrosilicon dust [manufactured by Yakushima Electric Co., Ltd.] were uniformly mixed to form an inorganic binder.

These were mixed with coarsely crushed slag particles (90% or more of 1 to 5 mm), mixed with an appropriate amount of water and a dispersant, and then vibration molded to form test panels (20 x 20 x 10 mm).
)It was created.

When this panel was dried at 150° C. after natural curing, bending strength tests were conducted on the panel before and after firing, and on the panel after firing and curing in water, and the results shown in Table 2 were obtained.

CaO46,I S 1o216.8 A1203 14.6 Mg0 10.7 Pe20,2.2 Cr203 2.1 F 6.8 B203 0.5 Inu1moku Namadanji'L Composition of the composition listed in Table 3 An inorganic binder was prepared by subjecting fine calcium silicate powder (Blaine specific surface area: 3500 m2/17) to a predetermined amount of the same ferrosilicon dust as in Example 1.

Add a small amount of water to this inorganic binder and knead to form a 5cmφ
After preparing a cylindrical test bar of 10 cm in diameter and curing it naturally, its -axial compressive strength was measured, and the results shown in Table 4 were obtained.

CaO51, I S io 2 17.8 A1203 13.8 Mg0 10.5 Fe203 2.7 F 7.0 B203 0.6 All test rods were placed directly on a burner for 5 minutes, heated, and then placed in water. Although rapid heating and cooling were repeated three times, almost no cracks were observed.

[Effects of the Invention] The inorganic binder according to the present invention is a binder having physical properties different from those of ordinary Portland cement and hydraulic slag cement.

In other words, it is a characteristic inorganic binder that has both cementitious properties and ceramic properties, has hydraulic properties with a small amount of water, and its cured product is heat resistant and exhibits ceramic properties.

Therefore, the inorganic binder according to the present invention can be used to create various characteristic molded bodies, and can be expected to be used in the fields of building materials and ceramics.

Patent applicant Nihon Kagaku Kogyo Co., Ltd.

Claims (1)

[Claims] 1. Basicity = (CaO+MgO+M_2O)/(SiO_2
+Al_2O_3+B_2O_3) (weight ratio) (in the formula,
M represents an alkali metal) is in the range of 1.3 to 3.0 and is composed of a calcium silicate-based fine powder and an activated silica fine powder containing a boron component of 0.1 to 5.0% by weight in terms of B_2O_3. An inorganic binder characterized by: 2. Calcium silicate-based fine powder has a fluorine component of F3.
The inorganic binder according to claim 1, which contains up to 10% by weight. 3. The inorganic binder according to claim 1 or 2, wherein the calcium silicate-based fine powder is a crystalline fine powder having a Blaine specific surface area of 1,500 to 10,000 m^2/g of the molten and cooled material. 4. The inorganic binder according to claim 1, which has a blending composition of 5 to 50 parts by weight of activated silica per 100 parts by weight of calcium silicate-based fine powder.