JP2641707B2 - Manufacturing method of high-strength lightweight cement extruded product - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel method for producing a lightweight and high-strength cement extruded product. More specifically, the present invention relates to a method for producing a lightweight and high-strength cement extruded product at a low extrusion pressure and a high extrusion speed with high productivity.

[0002]

2. Description of the Related Art In recent years, a method for manufacturing concrete building materials such as flooring materials, exterior wall materials, and roofing materials by extrusion has been developed. This method is different from a conventional cast molding method and can be continuously produced. Therefore, it has recently been attracting attention as an industrial method.

[0003] By the way, a cement building material reduced in weight by adding an inorganic hollow spherical filler such as a shirasu balloon,
Usually manufactured by cast molding, but the cement composition containing this inorganic hollow spherical filler, because the inorganic hollow spherical filler is destroyed when shearing force is applied,
As it is, it cannot be used for extrusion molding.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to produce a lightweight cement building material, which has been produced by cast molding, using an extruder without destroying the hollow spherical filler compounded therein. It was made for the purpose of.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to develop a method for producing a lightweight cement building material by extrusion molding. By adding an extrusion aid having a composition, it has been found that smooth extrusion can be performed, and a lightweight and high-strength cement extruded product can be obtained at a low extrusion pressure. I've reached the point.

That is, the present invention relates to (A) cement 10
(B) 30 to 30 parts by weight of inorganic hollow spherical filler
80 parts by weight, and (C) inorganic or organic short fibers 8 to 16
Extrusion aid 40 consisting of 4% by weight, 4-14% by weight of a cellulose derivative and 70-88% by weight of volcanic glassy sediment powder.
To 90 parts by weight, and further water is added to obtain a water content of 30 to 4 parts.
After 5% by weight, this mixture was subjected to a molding pressure of 2 to 20 k.
A method for producing a high-strength lightweight cement extruded product characterized by extruding at gf / cm ² and then curing to form a cured product having a bulk density of 0.90 to 1.20 g / cm ^3. It is.

As the cement of the component (A) used in the method of the present invention, those usually used for cement molding, for example, Portland cement, magnesia cement, lime volcanic ash cement, natural cement, alumina cement and the like can be used. Can be. Also,
As the inorganic hollow spherical filler of the component (B), microballoons such as shirasu balloons and perlite balloons can be used, but shirasu balloons are preferred because they can be easily obtained. This Shirasu balloon is
A hollow glass sphere obtained by subjecting shirasu (mineral containing natural glass as a main component) particles to a heat treatment at a temperature of about 800 to 1200 ° C. by a known method and foaming the glass;
Usually, those having an average particle diameter in the range of 20 to 100 μm and a bulk density in the range of 0.1 to 0.5 g / cm ³ are preferred. In the present invention, the shirasu balloon is blended at a ratio of 30 to 80 parts by weight per 100 parts by weight of cement. If the amount is less than 30 parts by weight, the effect of weight reduction will not be sufficiently exhibited, and if it exceeds 80 parts by weight, the shirasu balloon may be broken, and the strength of the obtained concrete molded product may be reduced.

Next, in the method of the present invention, it is necessary to use a mixture of inorganic or organic short fibers, a cellulose derivative, and a fine powder of volcanic glass sediment as an extrusion aid of the component (C). The inorganic or organic staple fiber prevents the cement material from being cut at the time of extrusion, improves the extrudability, and exerts the effect of reinforcing the obtained molded body.For example, asbestos, glass fiber, carbon Inorganic fibers such as fibers, various synthetic fibers, and organic fibers such as pulp fibers are used. This fiber is a so-called short fiber and usually has a diameter of 10 to 50 μm and a length of 0.5 to 5 mm.
Are preferred.

[0009] The cellulose derivative enhances the binding between the various inorganic granules constituting the cement or between them and the above-mentioned short fibers, and plays a role of a lubricant. For example, methylcellulose, ethylcellulose, carboxylate, etc. Cellulose derivatives such as methylcellulose and acetylcellulose are used.

The volcanic vitreous sediment fine powder used in combination with the above can reduce the molding pressure or increase the molding speed to enhance the moldability, and also suppress the separation of the inorganic hollow spherical filler, It plays a role of reinforcing and preventing collapse during extrusion, and powders of naturally occurring minerals such as shirasu, obsidian, perlite and pine stone are used. These are usually SiO ₂ , Al ₂ O ₃ , Fe
A mineral composed of components such as O ₃ , CaO, MgO, Na ₂ O, and K ₂ O. In the present invention, these minerals are pulverized by mechanical means and classified by dry classification, wet classification, or both. And use the fine segmentation. The fine powder of the volcanic glassy sediment preferably has a particle diameter of 20 μm or less.

The extrusion aid used in the method of the present invention comprises the above-mentioned components in an amount of from 8 to 16% by weight of inorganic or organic short fibers, from 4 to 14% by weight of a cellulose derivative and from 70 to 88% by weight of a fine volcanic glassy sediment powder. It is included within the range.

In the method of the present invention, in addition to the above-mentioned components (A) to (C),
Cement additives commonly used in general cement mortar, such as a hardening accelerator, a water reducing agent, and a coloring agent, can be contained.

In order to prepare the raw material mixture in the method of the present invention, the components (A) to (C) are mixed in an arbitrary order using a Henschel mixer, an Omini mixer, etc., and a required amount of water is added. Mix well with a kneader or the like.
At this time, as the extrusion aid of the component (C), a mixture prepared in advance may be used, or its constituent inorganic or organic short fibers, cellulose derivative and volcanic glassy sediment fine powder may be directly added to an arbitrary powder. They may be added in order.

Next, the kneaded material obtained in this manner is extruded by using an extruder such as a screw extruder to obtain 2 to 20 kgf.
Extrusion at a molding pressure of / cm ² .

Next, the extruded product is left in a wet state for several hours to several tens of hours, and then subjected to underwater training, steam training or autoclave training to obtain a bulk density of 0.90 to 1.
A cured product of 20 g / cm ³ is formed.

Thus, the bulk density of 0.90 to 1.
Light weight of 20 g / cm ³ and bending strength of 90 to 1
A high-strength cement building material of 20 kgf / cm ² or more can be manufactured continuously.

[0017]

According to the present invention, a lightweight cement building material containing an inorganic hollow spherical filler, which could not be obtained until now by casting, can be efficiently produced by extrusion molding, and its strength is further improved. It can be.
Therefore, it is suitable as an industrial method for producing building materials such as flooring materials, exterior wall materials, and roofing materials using cement as a raw material.

[0018]

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

The characteristics in each example were measured according to the following methods. (1) Bending strength For the cement extruded product, using an autograph manufactured by Shimadzu Corporation, span 150 mm, loading speed 1 min.
It was measured with a centralized loading of mm. (2) Extrusion Moldability Extrusion pressure (kg
f / cm ² ) and the extrusion speed (cm / min) were determined, and the extrusion moldability was evaluated. This extrudability, low extrusion pressure,
The higher the extrusion speed, the better the evaluation. The following shirasu balloon was used as the inorganic hollow spherical filler. Shirasu Balloon A: Terra Balloon (trade name), manufactured by Calceed Co., Ltd. Average particle size 27 μm, bulk density 0.43 g / cm ³ Shirasu Balloon B: Sankilite Y04 (trade name), manufactured by Sanki Kako Construction Co., Ltd. Average Particle size 38 μm, bulk density 0.45 g / cm ³

Reference Example 1 A volcanic glassy sediment (produced in Iizaka-machi, Fukushima City, Fukushima Prefecture, commonly known as Fukushima Shirato) having the composition shown in Table 1 was disintegrated, air-classified, and classifications of 20 μm or less were collected. A fine powder (X) having a diameter of 4 μm was obtained.

[0021]

[Table 1]

Next, this fine powder, pulp fiber [manufactured by Hokushin Co., Ltd., fiber diameter 12 μm, fiber length 3 mm], and methyl cellulose [manufactured by Shin-Etsu Chemical Co., Ltd., 90SH-150]
00] were mixed at the weight ratios shown in Table 2 to prepare extrusion aids A, B and C.

[0023]

[Table 2]

REFERENCE EXAMPLE 2 In the same manner as in Reference Example 1, classifications of 40 μm or less were collected by classification to obtain a fine powder (Y) having an average particle size of 14 μm. Next, this fine powder was mixed with pulp fiber and methyl cellulose at the weight ratio shown in Table 3 in the same manner as in Reference Example 1,
Extrusion aids D and E were prepared.

[0025]

[Table 3]

Reference Example 3 Extrusion aid F was prepared by mixing only pulp fiber and methyl cellulose at a weight ratio of 2: 1.

Example 1 Ordinary Portland cement [Mitsubishi Materials Corporation]
65.3 parts by weight of Shirasu Balloon A to 100 parts by weight, a curing accelerator [Diemix, manufactured by Showa Mining Co., Ltd.] 10.0
Parts by weight and 80.0 parts by weight of the extrusion aid A obtained in Reference Example 1 were added to an omni mixer [Chiyoda Giken Mining Co., Ltd .;
M-30] for 20 seconds.
Parts by weight and mixed for another 20 seconds to give a water content of 37% by weight.
Was prepared.

Next, this mixture is used as a product of Miyazaki Iron Works Co., Ltd.
After sufficiently kneading using a DM-100 type kneader,
Using a DE-50 type extrusion molding machine manufactured by Honda Iron Works Co., Ltd.
A plate-shaped molded body having a cross section of 12 mm × 60 mm was formed. The extrusion pressure at this time was 8.5 kgf / cm ² , and the extrusion speed was 52 c.
m / min.

Next, this plate-like molded body was subjected to humid air at room temperature for 2 hours.
After leaving for 4 hours, perform steam curing at 70 ° C for 5 hours.
Cement extrudates were manufactured. Table 4 shows the physical properties of the obtained molded product together with the raw material composition and the extrudability.

Examples 2 to 5 Cement extrudates were produced in the same manner as in Example 1 except that the raw material composition was changed using the extrusion aids shown in Table 4. Table 4 shows the extrusion moldability and physical properties of the molded product.

[0031]

[Table 4]

Examples 6 to 10 A cement extruded product was produced in the same manner as in Example 1 except that the shirasu balloon B was used in place of the shirasu balloon A in Example 1 and the raw material compositions shown in Table 5 were used. Table 5 shows the extrusion moldability and physical properties of the molded product.

[0033]

[Table 5]

Comparative Examples 1 to 6 Cement extruded products were produced in the same manner as in Example 1 using the extrusion aid F containing no fine powder of volcanic glassy sediment and the raw material composition shown in Table 6. Table 6 shows the extrudability and physical properties of the molded product.

[0035]

[Table 6]

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical indication location C04B 16:02 24:38) 103: 30 111: 00 (72) Inventor Kenji Suzuki Mine City, Yamaguchi Prefecture 461-1, Isa-cho, Isa-cho, Inc. (72) Inventor Junichi Kimoto 461-11, Isa-cho, Isa-cho, Mine-shi, Yamaguchi Pref. (1) Examiner Hideo Tokunaga in Calceed Inc. (56) References JP-A-6-298580 (JP, A) JP-A-53-34819 (JP, A) JP-A-6-63923 (JP, A)

Claims (1)

(57) [Claims] (A) For 100 parts by weight of cement,
(B) 30 to 80 parts by weight of an inorganic hollow spherical filler,
(C) 40 to 90 parts by weight of an extrusion aid consisting of 8 to 16% by weight of inorganic or organic short fibers, 4 to 14% by weight of a cellulose derivative and 70 to 88% by weight of volcanic glassy sediment powder, and further water. The mixture was extruded at a molding pressure of ² to ²⁰ kgf / cm ² and then cured to a bulk density of 0.90 to 1.2.
A method for producing a high-strength lightweight cement extruded product, which comprises forming a cured product of 0 g / cm ³ .