KR20190003081A - Slag board and method for preparing thereof - Google Patents

Abstract

The present invention relates to a slag board and a manufacturing method thereof. Specifically, the slag board of the present invention comprises blast furnace slag powder; an alkali activator; aluminum powder or aqueous hydrogen peroxide solution; and an adhesive. The manufacturing method includes a step of mixing a slag board composition to manufacture a mixed product; and a step of putting the mixed product in a mold and curing it. The slag board according to the present invention does not include asbestos and is a resource recycling and environmentally friendly product using blast furnace slag which is an industrial waste. Further, the slag board of the present invention is excellent in hydraulicity, heat insulation and soundproofness, and particularly excellent in nonflammability, and thus can be usefully used as an interior and exterior material for construction.

Description

[0001] Slag board and method for manufacturing the same [0002]

The present invention relates to a slag board composition using blast furnace slag, which is an industrial waste, and a method of manufacturing the same.

Currently, gypsum board products, which are produced domestically and overseas, are predominantly made of gypsum boards with waterproof, sterilized, and fireproof properties. The waterproof board is used to prevent the absorption of water by waterproofing the gypsum core and paper used for making the gypsum board. It is generally used in places such as bathroom, kitchen where there is much moisture. The gypsum board is a product that has improved waterproofing and sterilization functions to prevent molds from being generated in humid places. Fire retardant gypsum boards are made by adding inorganic fire-resistant fibers to the lightweight partition walls and fire partition areas.

In addition to the general gypsum board, recently, there are a product which improves the stability and rigidity of the material by mixing gypsum and cement, and a fireproof ceiling material which is formed by blast furnace slag and natural ore by melting the natural ore at high temperature, , Silica fiber and cellulose fiber are mixed and pressurized at high pressure and then produced by autoclave curing to produce products having improved properties such as fire resistance, sound insulation, water resistance, impact resistance and longevity.

In recent years, non-burning construction materials such as far-infrared rays generated by using yellow clay have been produced.

However, in the case of a general gypsum board, waterproof and bacteriostatic functions due to absorption of water by the gypsum are inevitably weakened by mixing the gypsum core and the raw paper together with the gypsum in order to maintain the form and improve the bending strength and the cracking property, And the strength is lowered due to the absorption of water under the condition, and the disadvantage due to moisture is strongly appeared.

In addition, some of the various boards developed by other special products have some parts to be cautious due to the characteristics of asbestos, which is obtained by melting at high temperatures. In the case of products using Portland cement, etc., There are disadvantages such as high usage and complexity of process, and other developed loess products have various drawbacks except for their specificity.

On the other hand, slag is produced by processing blast furnace slag from iron ore blast furnace iron, and converter slag and scrap iron from steelmaking steel to remove impurities from the iron. There is an electric furnace slag coming out of an electric furnace. These slag are limitedly used in cement additive, crushed aggregate and the like depending on their characteristics, and the utilization of the slag is increasing in various fields such as building materials and ceramics materials.

Accordingly, the present inventors have made efforts to supplement the above-mentioned disadvantages of the gypsum board using conventional gypsum. As a result, they have found that when a dry board is manufactured by using blast furnace slag, which is an industrial by-product, it is excellent in hydraulic properties, heat insulation, soundproofness, Compressive strength and flexural strength, and thus it can be effectively used as an interior and exterior material for construction. Thus, the present invention has been completed.

Patent Document 1: Korean Patent Publication No. 1997-0042390 (published on July 24, 1997) Patent Document 2: Korean Patent Publication No. 2002-0050990 (published on June 28, 2002) Patent Document 3: Korean Patent Laid-Open No. 10-2004-0021231 (published on March 10, 2004)

Accordingly, one object of the present invention is to provide a slag board as a building interior and exterior material which can recycle and resource industrial by-products such as blast furnace slag.

Another object of the present invention is to provide an environmentally friendly slag board containing no asbestos.

Another object of the present invention is to provide a slag board which is moisture resistant and nonflammable.

In one aspect, the present invention provides a slag board composition comprising a blast furnace slag, an alkaline activator, a blowing agent, and a tackifier.

In the present invention, blast furnace slag refers to a molten slag in which a mineral component is melted together with molten iron at about 1500 ° C when iron ore, coke, limestone or the like is melted in a blast furnace to produce molten slag. The blast furnace slag may be a carbonaceous material slag or a water-based slag, or a mixture thereof. Preferably, the blast furnace slag is highly water-resistant.

Also, the blast furnace slag is preferably used as a powder in the production of the slag board according to the present invention, and the powder has a powder degree of 3,000 to 8,000. However, the higher the degree of powder, the higher the reactivity between the blast furnace slag powder and the following alkali activator in the production of the slag board according to the present invention. Thus, a slag board having a good quality can be produced. However, And a powder having a degree of powder of preferably 3,000 to 5,000, more preferably 3,900 to 4,100, and even more preferably 4,000, may be used because it is expensive.

In the present invention, the alkali activator is an alkaline substance that causes a chemical reaction with the blast furnace slag to solidify the blast furnace slag like a cement. Such an alkali activator is a basic substance having a pH of 7 or more, preferably a pH of 8 or more. Examples thereof include sodium hydroxide, potassium hydroxide and the like.

The alkali activator has a concentration (M) of 3.0 to 4.5 molar (M), preferably 3.5 to 4.5 molar (M), more preferably 3.8 to 4.2 molar, and even more preferably 4.0 molar (M), and is contained in the composition as 400 to 500 ml, preferably 450 ml, based on 1 kg of the blast furnace slag. When the alkali activating agent is used outside the above range, there is a problem that the mixture becomes too weak or too thick to form a dough with the blast furnace slag, and the compressive strength is weakened.

As a specific example, the blast furnace slag powder was mixed and kneaded with water only, and after curing, the compressive strength, the specific beam characteristics and the molding characteristics of the blend were examined. As a result, blast furnace slag has excellent hydraulic strength as compared with cement, Could not be measured because curing was impossible.

As another specific example, when the blast furnace slag powder was mixed with various activators of alkaline activators in various concentrations and amounts and cured after being kneaded, the curing ability and excellent compressive strength were exhibited at the above-mentioned concentration and amount of use.

Therefore, it is necessary to use an alkali activator in the kneading of the blast furnace slag powder to produce a slag board, and the slag board thus produced exhibits excellent curing ability and compressive strength while having hydraulic properties.

In the present invention, the foaming agent is a substance used to reduce the specific gravity of the slag board to be produced and increase the effects of heat insulation and soundproofing, and preferably hydrogen peroxide or aluminum.

When the foaming agent is hydrogen peroxide, an aqueous solution is preferable, and it is used in an amount of 5 to 10 ml, based on 1 kg of blast furnace slag. There is a problem that the bending strength becomes too weak when the foaming agent exceeding the above range is used.

When the foaming agent is aluminum powder, it is preferably used in an amount of 0.5 to 1.0 g based on 1 kg of blast furnace slag. There is a problem that the bending strength becomes too weak when the foaming agent exceeding the above range is used.

In the present invention, the pressure-sensitive adhesive is intended to allow both organisms to adhere to the slag board raw paper when the slag board composition is cured, and is preferably starch.

The pressure-sensitive adhesive is preferably used in an amount of 5 to 15 ml based on 1 kg of blast furnace slag. When a pressure-sensitive adhesive exceeding the above range is used, there is a problem that the bending strength becomes too weak.

Unlike the conventional gypsum board, the slag board made of the slag board composition of the present invention does not contain asbestos and is environmentally friendly construction material. Further, the slag board according to the present invention is a building material having the effects of hydraulics, heat insulation, soundproofing, and incombustibility.

In another aspect, the present invention provides a method for producing an asbestos-free and incombustible slag board.

In a specific embodiment, the method for producing a slag board of the present invention comprises the steps of (S1) blending kneaded blast furnace slag powder, an alkali activating agent, a foaming agent and a pressure-sensitive adhesive to prepare a kneaded product; And curing the kneaded product in a mold.

The step (S1) is a step of mixing the blast furnace slag powder, the alkali activator, the foaming agent and the pressure-sensitive adhesive to prepare a kneaded product.

The blast furnace slag powder, the alkali activator, the foaming agent and the pressure-sensitive adhesive are as described above, and the alkali activating agent, the foaming agent and the pressure-sensitive adhesive are mixed and kneaded with the above-mentioned content based on 1 kg of the blast furnace slag powder.

Next, (S2) is a step of putting the kneaded product of the step (S1) into a mold and curing it.

The mold is a mold for manufacturing a board, and has a shape such as a square, a rectangle, or the like.

The curing is preferably carried out for 1 to 7 days by hardly drying the kneaded product in the step (S1). However, when the raw paper described below is used, the curing time is preferably 3 days to 7 days so that the raw paper adheres well to the kneaded product.

Meanwhile, the forming mold may be provided with a raw paper to maintain the shape of the slag board on the upper and lower surfaces thereof and to reinforce the bending strength of the slag board.

Unlike gypsum board, mineral paper is preferable. As a specific example, when a mineral paper other than a conventional gypsum board is used, it is not readily decomposed into an alkali activator and a foaming agent used in the production of the slag board according to the present invention, and is easily torn The stability is very high.

The slag board according to the present invention does not require an energy consumption process by solidifying the blast-furnace slag powder with an alkali activator by solidifying the characteristics of the cement, and is lightweight but nonflammable due to the use of a foaming agent and does not contain asbestos It can be used as an interior and exterior environmentally friendly building. In addition, the slag board according to the present invention has resistance to moisture, so that it can be used in a high humidity environment, and has an effect of soundproofing and insulating property due to the formation of bubbles in the foaming agent. In addition, it has the effect of recycling resources and preventing environmental pollution by using blast furnace slag, which is an industrial waste.

FIG. 1 is a graph showing the results of analysis of bending failure analysis of a conventional gypsum board and a slag board.
FIG. 2 is a graph showing an interior construction performance of a slag board according to an embodiment of the present invention.
3 is a non-flammability test result report of a slag board according to an embodiment of the present invention.
4 is a test report of asbestos detection test results of a slag board according to an embodiment of the present invention.
FIG. 5 is a test report showing water content and dimensional test results of a slag board according to an embodiment of the present invention.

Example 1: Preparation of materials

1-1. Blast furnace slag

During the Gwangyang steelmaking process, blast furnace slag (hereinafter referred to as "slag"), which is an industrial by-product, was prepared. The specific gravity of the slag is 4,234 cm ² / g and the specific gravity is 2.91. The specific gravity of the slag is 4,234 cm ² / g. The specific gravity of the blast furnace slag is 3,000 (specific surface area 4,000 ~ 6,000 cm ² / g) specified in Korean Industrial Standard KS F 2563 appear. Chemical analysis of the slag was found to be 43.9% CaO and Al ₂ O as main components _{SiO 2 32.8% 3 14.9%,} MgO 5.0%, with a high glass transition rate is determined based high hydraulic Mellilite as small granulated slag.

1-2. Alkaline activator

In order to obtain the cement characteristics of slag, 2M ~ 5M NaOH solution was prepared by dissolving Sodium hydroxide (purity: 98 wt%) for industrial use of industrial company D in water to determine optimal slag compounding ratio and NaOH content Respectively.

1-3. Board Paper

Through the field trip to a gypsum manufacturing plant such as USG, the raw paper used in the gypsum board experiment was obtained and other suitable mineral paper was obtained and used in the experiment to judge the suitability.

Example 2 Preparation, Formulation and Analysis of Slag Board Specimens

2-1. Manufacture of slag board specimen

In order to activate the blast furnace slag powder and to develop the characteristics of cement, an alkali activating reaction is required. To this end, an alkali activating solution of a desired concentration is prepared by mixing sodium hydroxide and water.

Next, to make slag board incombustible building material specimens, these activating solutions and slag were directly kneaded by hand. The specimens used for sample preparation were cubic molds of 300 mm in width, 400 mm in length and 12.5 mm in height.

Inside the mold, prepare a sheet of gypsum board to fit the specimen size, fill the mold with the sample, and then plunge 20 ~ 30 times each time to chop up the top layer. Then, lay the gypsum board surface with the trowel, (KS F3504).

When the specimens were made, the compressive strength was affected by the degree of sealing, so one person took charge.

The specimens placed in the molds were activated for 1 day in air at room temperature and demolded. The specimens were prepared by curing at room temperature until the measurement of flexural strength.

2-2. Mixing condition

Lightweight Foamed Slag Boards In order to determine the blending ratio of slag of incombustible building material specimens and the mixing ratio of activator / slag to the optimum alkali activator concentration for expressing the compressive strength, blending conditions as shown in Table 1 were used.

AA NaOH 2M 3M 4M 5M Ratio Activator
/ Slag
(wt%) 0.3 One 0.3 One 0.3 One 0.3 One 0.4 0.4 0.4 0.4 0.5 0.5 0.5 0.5

2-3. Analysis method

(1) Adjustment of specimen

The specimens were dried in a drier adjusted to a temperature of (40 ± 2) ° C. until the weight became constant. However, the specimens used for the insulation test were placed in a standing state.

(2) Measurement of dimensions

The thickness of the sample was measured at three points by a measuring instrument having a precision of 0.05 mm or more within 20 mm from the end portion in the direction of the butterfly direction, and the average value thereof was determined. Length and width measurements are made by placing the specimen on a flat bench and measuring the length and the center of each of the butterflies at a distance of 1 mm from the 1st grade scale strip specified in KS B 5209 or 1 mm straight metal scale with the scale specified in KS B 5246 .

(3) Water content test

The moisture content test was carried out according to the following equation by measuring the mass (m ₁ ) before drying of the flexural fracture load specimen and the mass (m ₀ ) after drying by the method shown in the above (2) with a precision of 1 g.

Moisture content (%) = (m _{1 -} m ₀ ) / m ₀ × 100

(4) Flexural failure load test

In the flexural fracture load test, the specimens were dried immediately after the above-mentioned method (1) and immediately tested. Specifically, the span was set to 350 mm in the longitudinal direction with the surface of the test piece directed downward and the surface in the direction of the butterfly directed upward, and the concentrated load was applied to the entire butterfly at the center of the span. The average loading speed was 250 N / min ± 20%.

(5) Burning performance test

(5-1) Semi-incombustible test

The test specimens shall be of the same construction and material as the actual specimens and shall be tested without separate finish on each cross section of the specimens. The size of the specimen was in accordance with KS F ISO 5660-1 and the size of the specimen of gas harmfulness was in accordance with KS F 2271.

As a specific test method, three tests were conducted on the surface contacting the room in accordance with KS F ISO 5660-1, and the total calorific value was measured for 10 minutes after the start of the heating test, and the maximum heat The release rate was measured. After heating for 10 minutes, a defect penetrating through the specimen was observed. The gas hazard test was carried out twice according to KS F 2271 on the side facing the room.

(5-2) Nonflammability test

The test specimens shall be of the same construction and material as the actual specimens and shall be tested without separate finish on each cross section of the specimens. The size of the specimen was in accordance with KS F ISO 1182 and the size of the specimen of gas harmfulness was in accordance with KS F 2271.

As a specific test method, first three tests were conducted according to KS F ISO 1182, and the maximum temperature in the heating furnace was measured for 20 minutes after the start of the heating test, and the difference from the final equilibrium temperature was measured. However, equilibrium was not reached for 20 minutes, and the average temperature for the final 1 minute was regarded as the final equilibrium temperature. The gas hazard test was carried out twice according to KS F 2271 on the side facing the room.

(6) Asbestos detection experiment

The asbestos contained in the product was tested by KS Q ISO IEC 17025 and KS A ISO 5725, which was inspected by the Korea Chemical Fusion Test Institute. X-ray diffraction (XRD), polarized microscopy (PLM), scanning electron microscope Method (SEM or TEM).

Example 3: Measurement of compressive strength of slag board according to the present invention

3-1. Manufacture of slag boards

A slag board according to the present invention was prepared in the same manner as in Example 2-1 using the materials described in Example 1. The blast furnace slag used in the production was powdered and used. The higher the blastability of the blast furnace slag, the higher the reactivity. However, since it takes a lot of time and effort to produce the blast furnace slag, it is economically inefficient. The slag of Figure 4000 was used.

3-2. Measurement of compressive strength by mixing blast furnace slag and water during slag manufacturing

In order to investigate the hydraulic properties of blast furnace slag with SiO ₂ , CaO and Al ₂ O ₃ contents, pure blast furnace slag powders were mixed and kneaded with water and cured. The compressive strength of the blast furnace slag was measured, The results are shown in Table 2 below.

division OPC
cement smartass
Slag NaOH Water
ratio

) Experimental results (curing time, compressive strength -

) Remarks Kneading time 3 days 7 days 14 days SiO ₂ 21.9 32.8 0M 0.35 5 minutes 0 0 0 Per 1 kg of slag powder CaO 64.2 43.9

5 14.9

3.7 0.4

2 5 10 minutes 0 0 0

14.8 1.2

0.9 0.6

0.0 0.0

As can be seen from Table 2, it was difficult to demold the mold due to insufficient curing. Also, although the specimen could not measure the compressive strength due to the dullness, the experiment was carried out randomly and the compressive strength was not realized as expected.

3-3. Measurement of compressive strength according to the concentration of alkali activator in slag manufacturing

In order to determine the proper concentration of the alkali activator (NaOH) in the production of the slag board, the curing time is set to 1 to 28 days, the bimetery time for the kneading (reaction) for forming is changed from 5 to 30 minutes, And the compressive strength of the specimens was measured. The results are shown in Table 3 below.

(Unit: N / mm ² ) Curing time Non-beam time Compressive strength according to NaOH input concentration 3.0mol 3.5mol 4.0mol 4.5mol 5.0mol 5.5mol 1day 5 minutes 4 5 10 10 9 7 10 minutes 8 6 13 14 10 4 20 minutes 10 8 12 13 11 0 30 minutes 3 2 13 12 13 0 3day 5 minutes 6 6 20 9 12 7 10 minutes 10 8 21 10 16 4 20 minutes 10 10 19 13 0 0 30 minutes 3 2 20 13 0 0 7day 5 minutes 10 11 23 13 8 8 10 minutes 13 11 25 14 8 4 20 minutes 8 8 22 28 0 3 30 minutes 3 3 22 14 0 2 14day 5 minutes 10 11 26 13 11 10 10 minutes 15 13 25 16 14 5 20 minutes 14 12 23 12 28 3 30 minutes 4 5 23 15 13 2 28day 5 minutes 10 11 27 18 8 14 10 minutes 15 15 26 16 9 5 20 minutes 14 13 24 19 14 2 30 minutes 4 5 23 20 10 0

As can be seen from the above Table 3, it was confirmed that when the slump of the slag dough is 3.0-4.5 M, it is the most watery batter. In the case of 5.0 ~ 5.5M, it was often difficult to knead or the dough was not properly formed due to excessive reaction. As a result, it was found that the overall strength at 4M is the most stable and high compressive strength.

3-4. Measurement of compressive strength according to input amount of alkali activator when manufacturing slag

In order to determine the amount of alkali activator (NaOH), the compressive strength of specimens was measured by varying the alkali activator (4M concentration) from 350ml to 550ml per 1kg of slag powder. The results are shown in Table 4 below.

(Unit: N / mm ² ) Curing time Non-beam time Compressive strength according to input amount of alkali activator (4M-NaOH) 350ml 400ml 450ml 500ml 550ml 3day 5 minutes 0 8 20 4 One 10 minutes 0 10 21 7 One 20 minutes 0 10 19 7 2 30 minutes 0 12 20 8 2 7day 5 minutes 0 15 23 10 3 10 minutes 0 17 24 8 3 20 minutes 0 17 24 10 4 30 minutes 0 17 25 12 5

As can be seen from Table 4, when the amount of the alkali activating agent was 350 ml at the time of preparing the slag, the dough was not formed due to the shortage of the amount of the alkali activator. In case of 400 ~ 500ml, the dough progressed well, but when it was 450ml, the dough was most suitable and the strength was also high. In case of 550ml, the excessive amount of liquid is almost in the form of water, and when it is put into the mold, it is more likely to leak out to the side.

3-5. Measurement of Compressive Strength of Alkali Activator with Temperature at the Production of Slag

The effect of alkali activator on the dough shape and bending strength after curing of slag powder and alkali activator (NaOH) was investigated. In order to determine the proper reaction temperature for the mixing process, , 65 ° C and 70 ° C, respectively. The results are shown in Table 5 below.

(Unit: N / mm ² ) Temperature 20 ℃ 65 ℃ 70 ℃ Compressive strength 408 632 0

As can be seen in Table 5, when the temperature of the alkali activator was 20 ° C, it was very easy to form a water-based paste by kneading, and evenly mixed with a mixer or the like. It was observed that this amount of water vapor was used in the actual board manufacturing plant. When the mold was simply poured in molding, it was not difficult to get a proper shape. At 65 ℃, it is easy to knead the bread with a handful of kneaders. Using a mixer similar to a kneader for a bread dough is better than a general mixer. When molding in a mold, it is not a good shape to simply pour, so it was necessary to complete the shape by using a tool to press and tack on the surface. In order to maintain a good shape at the actual board factory, we could observe the compressing devices in each process section, and this slag board was also deemed necessary. At 70 ℃, the dough was not formed due to excessive reaction, and it felt like it was making a trowel. As a result, the dough did not work properly, so the mold could not be formed.

Example 4: Comparison test of bending strength according to kind and amount of foaming agent

Since the slag board has a somewhat higher specific gravity than the gypsum board, the aluminum powder and hydrogen peroxide water (H ₂ O ₂ ) are mixed with the aluminum powder (H ₂ O ₂ ) in order to reduce the weight through the foaming and to increase the effect of heat insulation and sound insulation. Respectively.

4-1. Measurement of bending strength according to the amount of aluminum powder

Al powder reacts with NaOH to generate H ₂ gas to form pores of the specimen. As the ratio of pores increases, the strength weakens. Therefore, to determine the appropriate dosage to form the maximum pore while satisfying the required bending strength, The bending strength of the slag powder was measured at 0.5, 1.0 and 1.5 g per 1 kg of the slag powder. The results are shown in Table 6.

As can be seen from Table 6, when the Al powder did not determine the wateriness of the dough, when the Al powder was administered at 1.5 g, the bending strength became weak due to excessive bubbles. The amount of bubbles was changed according to the dose of Al powder. The specific gravity did not decrease remarkably until 1.0 g, but the decrease of specific gravity could be confirmed to some extent.

It is possible to meet the requirements of reducing the specific gravity and satisfying the flexural strength satisfying the requirements of 0.5g to 1.0g in the range of the dosage. However, since the material is pushed out through the gap of the mold due to bubble generation during the specimen curing, the amount of the material It is necessary to do.

4-2. Measurement of bending strength according to the amount of hydrogen peroxide

Compared with Al powder, H ₂ O ₂ is considered to be suitable for formation of pores during slag board production because it is easy to mix and disperse H ₂ O ₂ as a liquid by mixing with alkaline activator, . Therefore, the determination of dosage and the effect of dosage on the strength were examined and experiments were conducted to compare with Al powder. The results are shown in Table 7 below.

(Unit: N) division Flexural strength according to H ₂ O ₂ dose  0ml 5ml 10ml 15ml 20ml 1day 5 minutes 715 610 586 568 542 10 minutes 730 615 591 573 538 20 minutes 680 599 576 569 533 30 minutes 672 596 577 531 524 3day 5 minutes 732 618 605 593 564 10 minutes 725 621 613 598 573 20 minutes 691 602 594 601 579 30 minutes 694 599 581 587 581

The amount of H ₂ O ₂ did not affect the dough of the dough. Of H ₂ O ₂ The stable amount is 5 ~ 10 ml, and it can be confirmed that the bending strength is relatively weakened when the amount is more than 5 ~ 10 ml. The characteristic of H ₂ O ₂ is that it generates fewer bubbles than Al powder but accelerates the timing of bending strength. When the dough is put into the mold, it is expected to be more effective than the Al powder for the rapid production of the product since it has the characteristic that it forms a hardness as much as the wisteria after 5 ~ 10 minutes. It was also found that the introduction of liquid H ₂ O ₂ into the process was more effective than the addition of a small amount of powdered Al powder in the amount of foaming agent.

4-3. Comparison of bending strength according to the amount of Al powder and H ₂ O ₂

Characteristics of the blowing agent according to the Al powder and Al powder and the introduction of the H ₂ O ₂ results of comparative experiments the compression strength according to the injection of H ₂ O ₂ were shown in Table 8, based on these results, such as to select a blowing agent, and Performance and conditions were compared (see Table 9). As a result, it was judged that H ₂ O ₂ was suitable for commercialization as a blowing agent.

(Unit: N / mm ² ) division Compressive strength according to dose Al Powder H ₂ O ₂ 1day 5 minutes 10 18 10 minutes 13 19 20 minutes 12 19 30 minutes 13 20 3day 5 minutes 20 23 10 minutes 21 22 20 minutes 19 24 30 minutes 20 22

Compare Al Powder H ₂ O ₂ price high price Cheaper than Al powder Pore forming ability Pore formation is good even in a small amount Pore formation less than powder Ability to implement compressive strength Implement compression strength at the same speed as the basic experiment (3 ~ 7 days of compressive strength implementation) Much faster compressive strength than powder (1 day of compressive strength implementation) Curing Differences When the dough is put into the mold, the dough is overflowing due to the continuous reaction. When the dough is put into the mold, it takes about 5 ~ 10 minutes to achieve a compressive strength of about the same as that of the clay.

Example 5: Comparison of compressive strength with addition of a reinforcing material

The bending strength of the gypsum board is largely supported by the paper on both sides of the board used as the raw paper, and the bending strength of the slag board is also not so large compared with the compressive strength. In order to examine whether the stiffener can improve the bending strength of the slag board, a compressive strength test was performed on various reinforcement materials of various geosynthetics used for civil engineering structures. The results are shown in Table 10 below.

(Unit: N / mm ² ) division Mixing time Curing time 1day 3day 7day 14day 28day No reinforcement 5 minutes 10 20 23 26 27 10 minutes 13 21 25 25 26 20 minutes 12 19 22 23 24 30 minutes 13 20 22 23 23 Polyvinyl alcohol 5 minutes 10 20 20 23 26 10 minutes 11 19 22 23 26 20 minutes 11 19 21 20 24 30 minutes 12 18 20 24 25 Zicon Fiber 5 minutes 11 22 23 24 25 10 minutes 10 21 22 21 24 20 minutes 12 20 24 22 25 30 minutes 11 17 22 21 26 Fire Esh Fiber
(Mesh type 19mm) 5 minutes 11 18 20 23 26 10 minutes 11 20 23 24 27 20 minutes 12 20 22 20 23 30 minutes 12 21 22 22 24 Fire Esh Fiber
(Single type 6mm) 5 minutes 12 17 22 24 25 10 minutes 13 21 24 20 24 20 minutes 12 20 24 22 25 30 minutes 11 22 25 23 25 Nycon Materials 5 minutes 11 21 21 24 26 10 minutes 12 22 23 25 27 20 minutes 12 17 23 20 25 30 minutes 13 18 22 24 25

As can be seen from Table 10, the improvement effect of the compressive strength of the stiffener is not significant, so that the effect of improving the bending strength is also minimal. In addition, the reinforcing material tends to flocculate and not melt in NaOH, and it is difficult to uniformly distribute the reinforcing material when kneading the reinforcing material, and it is seated at random. The other stiffeners had the property that they were not broken immediately when the specimen was broken. On the basis of these results, it was judged that the slag board production would be better in terms of cost and efficiency, since the uniformity should be guaranteed.

Example 6: Application of gypsum board raw paper

The gypsum board maintains the shape of the gypsum and has the bending strength of the gypsum board which is very weak. The board is made by attaching the paper to the top and bottom of the board to reinforce the bending strength. The paper is called "paper" I am using it.

The slag board also showed a high compressive strength but a relatively low bending strength. It was judged that the need for raw paper is important for maintaining the shape of the board while maintaining the shape of the board. It is believed that the mineral used in the existing gypsum board, The paper was tested for the aging characteristics and the strength development characteristics of paper. Also, in order to improve the adhesion of the gypsum board to the gypsum board, starch is used in the production of gypsum board. In the case of the slag board, the amount of starch used was also changed to evaluate the adhesive property of the gypsum board . As a result, Table 11 shows the measurement results of the bending strength according to the amount of starch, Table 12 shows the difference between the existing paper and the mineral paper of the gypsum board, and Table 13 shows the comparison between the existing paper and the mineral paper of the gypsum board The experimental results are shown.

(Unit: N) Curing time Kneading time Flexural strength according to the amount of starch Starch 0ml Starch 5ml Starch 10ml Starch 15ml Starch 20ml 1day 5 minutes 610 621 611 618 601 10 minutes 615 617 614 622 610 20 minutes 599 603 600 598 582 30 minutes 596 610 599 601 599 3day 5 minutes 618 622 614 624 608 10 minutes 621 620 616 620 611 20 minutes 602 608 602 599 599 30 minutes 599 613 600 604 602

Gypsum board existing paper Mineral Papers Very susceptible to moisture Extremely strong in moisture When the gypsum board breaks, it tears like a circle map. It does not tear easily even in case of slag board breakage Very vulnerable to chemicals
(Disintegration of paper when chemical agent is used) Resistant to chemicals.
(No abnormality when using NaOH aqueous solution and foaming agent) Adhesion of raw paper is good even with a small amount of starch If the amount of starch is small, the adhesion of raw paper becomes poor.

(Unit: N) Curing time Kneading time Bending strength according to kind of paper Base origin Mineral Papers 1day 5 minutes 621 724 10 minutes 617 750 20 minutes 603 682 30 minutes 610 694 3day 5 minutes 622 840 10 minutes 620 837 20 minutes 608 718 30 minutes 613 705

As can be seen from Table 11, the amount of starch did not significantly affect the dough, but it was confirmed that the amount of starch was an important factor for determining the degree of adhesion to the raw paper. The amount of starch is a factor that lowers the bending strength of the specimen and it is important to determine the mixing ratio of the foaming agent and the starch solution. As a result, the amount of starch more than 20ml has a relatively large influence on the bending strength, Was determined to be appropriate.

As can be seen from Tables 12 and 13, in the case of the base paper, a phenomenon in which the base paper is melted and decomposed due to the characteristics of the paper occurred in most cases, so that most of the base paper was not attached to the board. In the case of the mineral paper, So the paper did not melt or disappear. The existing gypsum board is broken if it breaks with paper. However, this mineral paper does not tear the original paper but keeps the rest of the paper, so it will be more stable in case of breakage. However, the curing time was estimated to be 3 ~ 7 days for the adhesion to be complete.

Example 6: Analysis of use characteristics of slag board according to the present invention

As described in Examples 1 to 5, 450 ml of an alkali activator (NaOH), 10 ml of hydrogen peroxide, and 10 ml of starch were mixed per 1 kg of blast furnace slag powder to make slag dough, , A length 400 mm, and a height 12.5 mm. The slurry was cured for about 7 days to prepare a slag board according to an embodiment of the present invention. The prepared slag board was compared with the gypsum board reference strength and the like.

6-1. Analysis of bending failure of gypsum board and slag board

As shown in FIG. 1, the difference between the existing gypsum board and the slag board is somewhat confirmed. Specifically, in the case of the existing gypsum board, it was confirmed that all of the original gypsum boards were damaged due to the breakage of the original sheet, so that the gypsum board and the raw paper were completely adhered to each other, but the mineral paper used for the slag board was not damaged And showed rigid flexural fracture resistance. However, the mineral paper has a somewhat lack of aesthetics for commerciality compared to the existing gypsum board raw paper, and it is considered that processing appropriate to the slag board will be required in the future.

6-2. Investigation of interior construction performance of slag board

As a result of nailing the slag board in order to confirm the interior construction performance of the slag board, it was confirmed that the slag board was finished without breakage (see FIG. 2). These characteristics were considered to be good workability and merchantability which were not easily broken by impact when various types of interior construction were applied to the wall after applying slag board to the building.

6-3. Bending strength analysis of slag board

As a result of the analysis of the bending strength of the slag board, the measured bending strength was found to satisfy the criteria of the gypsum board in a width direction of 903.9N and a lengthwise direction of 1154.8N.

6-4. Product conformity testing through accredited certification body

The Korean Society of Chemical Testing, Korea Institute of Chemical Engineers (KEMCO), approved the test for suitability of the slag board according to the present invention. As a result, FIG. 3 shows the results of the incombustibility test, FIG. 4 shows the asbestos detection test results, and FIG. 5 shows the water content and the dimensional test results.

The incombustibility performance should not exceed the final equilibrium temperature of 20K, the mass reduction rate should be 30% or less, the average behavior suspension time should be 9 minutes or more as a result of the gas toxicity test, and the slag board according to the present invention satisfies all of these conditions, (See FIG. 3). Asbestos was not detected and it was confirmed that the asbestos was stable (see Fig. 4). In addition, it was confirmed that the thickness tolerance is ± 0.5 length + 2 / -1 butterfly + 1 / -2 mm, and it can be suitably used for an interior board or the like (see FIG. 5).

Claims (9)

Blast furnace slag powder; An alkali activator; A slag board composition comprising an aluminum powder or aqueous hydrogen peroxide solution and a tackifier. The slag board composition according to claim 1, wherein the blast furnace slag powder has a degree of powder of 3,000 to 8.000. The slag board composition of claim 1, wherein the alkali activator is sodium hydroxide or potassium hydroxide. The slag board composition of claim 1, wherein the alkali activator has a concentration (M) in the range of 3.0 to 4.5 moles and is contained in an amount of 400 to 500 ml based on 1 kg of blast furnace slag powder.
The slag board composition according to claim 1, wherein the aluminum powder is contained in an amount of 0.5 to 1.0 g based on 1 kg of the blast furnace slag powder. The slag board composition according to claim 1, wherein the aqueous hydrogen peroxide solution is contained in an amount of 5 to 10 ml based on 1 kg of the blast furnace slag powder. The slag board composition according to claim 1, wherein the pressure-sensitive adhesive is starch. The slag board composition according to claim 1, wherein the pressure-sensitive adhesive is contained in an amount of 5 to 15 ml based on 1 kg of the blast furnace slag powder. 9. A method for manufacturing a slag board, comprising the steps of: mixing and kneading the composition of any one of claims 1 to 8 to prepare a kneaded product; and placing the kneaded product in a molding mold and curing.

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