KR20040090613A - Porous ceramic internal and external material composition for construction and method for preparing the same - Google Patents

Abstract

PURPOSE: Provided is a method for producing porous ceramic materials, used as constructional interiors and exteriors, with lightweight and functionality by sintering ceramic raw materials at low temperature. CONSTITUTION: The porous ceramic composition comprises 60-80pts.wt. of glass powder such as soda-lime glass, borosilicate glass and aluminum silicate, 20-40pts.wt. of inorganic filling materials such as zeolite and kaolin for increase of forming strength, 4-10pts.wt. of foaming agent such as calcium carbonate and calcium phosphate, 4-10pts.wt. of sodium hydroxide for reduction of sintering temperature, and 1-8pts.wt. of polyvinyl alcohol(PVA). The porous constructional ceramics are produced by the following steps of: (i) mixing glass powder, inorganic materials and foaming agent; (ii) adding an mixed solution of NaOH and PVA, obtained by dissolving NaOH and PVA in 10-30pts.wt.(based on 100pts.wt.of raw materials) of water, to the mixed powder of the step (i); (iii) extruding mixture; (iv) layering formed bodies on a shelve and drying at 90-150deg.C over 8hrs; (v) sintering layered products 2-3times between 200-1000deg.C.

Description

Porous ceramic internal and external material composition for construction and method for preparing the same

The present invention relates to a porous ceramic interior and exterior materials for construction and a method for manufacturing interior and exterior materials using the same, and more particularly, using the interior and exterior materials for construction using light and excellent construction properties as well as the heat insulation, heat resistance, fire resistance, thermal insulation required as a building interior and exterior materials The present invention relates to a porous ceramic interior and exterior composition for construction and its manufacturing method which can be used as interior consumables in various forms while having excellent far-infrared radiation effect.

Conventional interior and exterior materials for building include E.P.S (Expanded Poly Styrene) panels, urethane, glass wool, light-weight foamed concrete (Autoclaved Lightweight Concrete), concrete PC (Prestressed Concrete). These building interior and exterior materials are vulnerable to fire, heavy weight, and inappropriate to use as a building material because of poor transport, construction and processability. In addition, the building interior and exterior materials have a problem that when the insulation and heat insulation is good, the flammability is weak and the moisture resistance is poor ventilation not meet the conditions as a building interior and exterior materials.

For example, EPS panel materials are susceptible to fire because of the use of foamed synthetic resins such as styrofoam, and toxic gases are generated during combustion, and glass wool has horizontal wool layers formed on the insulation panels. It is easy to crack horizontally and has a weak point of external pressure, and concrete PC has a disadvantage of weak impact strength and heavy weight, making transportation, construction and workability difficult.

Therefore, as a way to solve the problems described above, using the soil (especially loess) or briquettes to manufacture the building interior materials and provide them, but this also has a low moisture resistance and strength is not sufficient to function in the building interior and exterior materials. The problem is not being pointed out.

In order to solve these problems, some molded products in which rice straw or chaff are mixed are known (Korea Patent Publication No. 2000-8958), but they are mixed with wheat straw in rice straw and molded and compressed using an urethane foam resin adhesive. There is a problem in that the manufacturing process is complicated by being manufactured by the method, the moldability is not good, the thermocompression process is involved in molding.

Meanwhile, Korean Laid-Open Patent Publication No. 98-1881 discloses a method for manufacturing foam glass, which is used to increase the bonding strength when mixing raw materials, in a powder form in a foam box in a dry mixture without using a binder and water. Since the foam is put and foamed, the strength required for the interior and exterior materials of the building is significantly lowered.

Accordingly, an object of the present invention is to provide a lightweight and constructable porous ceramic interior and exterior composition for building construction that can be used as a variety of interior and exterior building materials while preventing the occurrence of cracks due to rapid cooling and low-cost manufacturing and firing at a relatively low temperature. .

It is another object of the present invention to provide a method of manufacturing a porous ceramic building interior and exterior material which can be used as interior consumables at the same time as well as having excellent far-infrared radiation effect as well as excellent thermal insulation, heat resistance and fire resistance required for building interior and exterior materials using the composition. have.

The porous ceramic interior and exterior building composition of the present invention for achieving the above object is 60 to 80 parts by weight of glass powder, 20 to 40 parts by weight of inorganic filler, 4 to 10 parts by weight of blowing agent, 4 to 10 parts by weight of sodium hydroxide and polyvinyl alcohol 1 It consists of 8 parts by weight.

Method for producing a porous ceramic interior and exterior building material for achieving another object of the present invention comprises the steps of mixing 60 to 80 parts by weight of glass powder, 20 to 40 parts by weight of inorganic filler and 4 to 10 parts by weight of blowing agent to obtain a mixed powder; 4 to 10 parts by weight of sodium hydroxide and 1 to 8 parts by weight of PVA were added to the mixed powder to obtain a mixture by wet mixing. The mixture was extruded, loaded on a shelf plate and stacked in several stages. After drying at ˜150 ° C. for at least 8 hours, calcining is included.

1 is a photograph showing a state in which fine bubbles of the porous ceramic obtained according to the present invention (Fine Foaming) is formed.

Figure 2 is a photograph showing a state (Coarse Foaming) is formed in the giant bubble of the porous ceramic obtained according to the present invention.

3 is a photograph showing a spherical state of the porous ceramic obtained according to the present invention.

Figure 4 is a photograph showing the carbonization state of the porous ceramic obtained in accordance with the present invention.

Looking at the present invention in more detail as follows.

As described above, the architectural porous ceramic interior and exterior composition of the present invention includes glass powder, inorganic filler, foaming agent, sodium hydroxide and PVA.

As glass powder used for this invention, it is preferable that it is any one powder of soda lime glass, borosilicate glass, aluminum silicate glass, lead glass, or its mixture. The amount of the glass powder is preferably 60 to 80 parts by weight with respect to the porous ceramic interior and exterior materials for building construction, if less than 60 parts by weight there is a problem that a crack occurs inside the product, if more than 80 parts by weight problems such as excessive glass on the surface Occurs and is not preferred.

The inorganic filler serves to increase the molding strength and may be used in combination with zeolite and wood clay, respectively, but it is preferable to use a mixture of zeolite and wood clay. On the other hand, the amount of the inorganic filler is preferably 20 to 40 parts by weight, but less than 20 parts by weight, the molding strength is lowered, and if it exceeds 40 parts by weight, the specific gravity is high, there is a disadvantage that the product is heavy.

As the blowing agent, calcium carbonate, calcium phosphate or calcium hydrogen phosphate may be used, and the amount of the blowing agent is preferably 4 to 10 parts by weight. If the amount of the blowing agent is less than 4 parts by weight, the foaming effect is inferior. If it exceeds 10 parts by weight, the strength of the interior and exterior materials tends to be lowered.

According to the present invention, the sodium hydroxide is used for the purpose of lowering the calcination temperature, the amount is preferably 4 to 10 parts by weight. If the amount of the sodium hydroxide is less than 4 parts by weight, the foaming effect is remarkably inferior, if it exceeds 10 parts by weight, the strength of the product due to excessive foaming, there is a disadvantage that the surface vitrification occurs.

The PVA is used as an organic binder, the amount of which is preferably 1 to 8 parts by weight. When the amount of use exceeds 8 parts by weight, the film is formed on the surface, and the moisture inside does not sufficiently escape, and thus, a void phenomenon occurs in the product after firing.

Looking at the manufacturing method of the porous ceramic interior and exterior building material of the present invention using such a composition, first, 60 to 80 parts by weight of the glass powder, 20 to 40 parts by weight of the inorganic filler and 4 to 10 parts by weight of the blowing agent to obtain a mixed powder. 4 to 10 parts by weight of sodium hydroxide and 1 to 8 parts by weight of PVA are added to the mixed powder, and an aqueous solution of 10 to 30 parts by weight of water is added to 100 parts by weight of the total solid content, followed by wet mixing to obtain a mixture. When the amount of the water used is excessive, the mixture agglomerates, and the mixing of the raw materials does not occur evenly, and when the amount is too small, the bonding force between the particles is lowered and the extrusion molding tends not to be easy.

According to the invention, the mixture is extruded and then loaded on a shelf plate, stacked in several stages and dried. In the drying process, the drying temperature is preferably dried for more than 8 hours between 90 ℃ to 150 ℃, if not enough drying occurs in the interior of the final product carbonization, durability and uniform color (color) can be maintained There will be no.

The molded product thus dried is calcined in a second to third order between 200 and 1000 ° C., and thus the interior and exterior materials for building a porous ceramic of the present invention are manufactured.

Hereinafter, the present invention will be described in more detail with reference to the following examples, but the scope of the present invention is not limited to the following examples.

Example 1

65 parts by weight of cullet powdered to 100 mesh or less, 15 parts by weight of wood clay, 10 parts by weight of natural zeolite and 4 parts by weight of calcium carbonate were added to a palm mill, and 5 parts by weight of sodium hydroxide and 1 part by weight of PVA were added to the mixture. An aqueous solution dissolved in 16 parts by weight of water was added to 100 parts by weight of the total solid content, and further mixed for 10 minutes, and then passed through a roll mill to spread the moisture evenly. Thus, the wet mixed mixture is formed into a 300 × 300 × 20 mm plate through a vacuum extruder, or formed into a spherical shape using a mold having a diameter of 20 to 30 mm to a 400 × 450 × 12 mm shelf plate. After loading at an appropriate interval, the wafer was loaded into a baking bogie of 900 × 180 × 1100 mm and placed in a shuttle kiln.

The firing conditions were dried for 8 hours at 150 ℃, and then heated up to 250 ℃ for 1 hour and then maintained for 30 minutes, after heating up from 250 ℃ to 450 ℃ for 1 hour and maintained for 20 minutes, after heating up from 450 ℃ to 800 ℃ for 1.5 hours Hold for 1 hour to form foam pores. The foam was slowly air cooled up to 300 ° C. and then naturally cooled.

The porous ceramic foam thus made was processed on a six side with a cutter to prepare interior and exterior materials for the desired porous ceramic building.

Experimental Example 1

Property measurement

The porous ceramic building interior and exterior materials of the present invention manufactured as in Example 1 were processed to a certain standard (300 × 250 × 30 mm plate or spherical product having a diameter of 20 to 40 mm), and then were commissioned by the Korea Institute of Materials Testing, properties, and far-infrared emissivity. It was measured, and the results are shown in Table 1 and Table 2 below.

Test Items result Test Methods Flame retardant (grade 1) Surface test Application over the entire thickness none KS F 2271-'98 Cracks on the back none Afterglow (seconds) 0 Smoke coefficient (Ca) 0 Temperature time area (℃ .mim) Within 3 minutes 0 After 3 minutes 0 Test Temperature difference (℃) +16 Compressive strength (㎏f / ㎠) 51 KS L 5105-'97 Density (㎏ / ㎠) 396 KS M 3808-'97 Absorption amount (g / 100㎠) 10.0 Thermal Conductivity (kcal / mh ℃) Average temperature 20 ℃ 0.088 KS L 9016-'95

As can be seen in Table 1, the interior and exterior materials for the porous ceramic building produced by the present invention was found to be about 3 times better than 18Kg / ㎠ compressive strength of the foam glass, the density was about 1.5 times higher. In summary, the general weight is slightly heavier than foamed glass, but the strength required for building interior and exterior materials is excellent.

Emissivity (5-20㎛) Radiation energy (W / ㎡) 0.925 3.73 × 10 ²

(* This experiment was tested at 40 ° C. and is a result of measuring black body using a FT IR spectrometer.)

As can be seen in Table 2, the far-infrared emissivity is that the far-infrared emissivity of the interior and exterior materials for the porous ceramic building of the present invention is excellent considering that the far-infrared emissivity of jade, ganban stone, etc., which are general natural stones, is about 0.90 to 0.93 μm. .

Experimental Example 2

Antimicrobial resistance measurement

The antibacterial test of the interior and exterior materials for the porous ceramic building of the present invention prepared as in Example 1 was carried out, the results are summarized in Table 3 below.

Test Items Culture test period Test Methods Antifungal test 1 week later after 2 weeks 3 weeks later 4 weeks later ASTM G-21 0 0 0 0

1) Mold Strains (Mixed Strains)

Aspergillus niger ATCC 9642

Penicillium pinophilum ATCC 11797

Chaetomium globosum ATCC 6205

Gliosiadium ATCC 9645

Aureobasidium pullulans ATCC 15233

2) reading of results

0: Growth of bacteria is not recognized in the sample.

As shown in Table 3, it can be seen that the porous ceramic product according to the present invention has excellent antibacterial resistance.

As described above, the present invention can be sintered at low temperature, while preventing the occurrence of cracks due to quenching, excellent strength and light weight compared to foam glass strength to provide a building interior and exterior materials excellent in workability, the insulation required as a building interior and exterior materials, It is not only excellent in heat resistance, heat insulation and sound insulation, but also can be used as interior and exterior materials for building with excellent far-infrared radiation effect and antibacterial resistance.

Claims (5)

60 to 80 parts by weight of glass powder, 20 to 40 parts by weight of inorganic filler, 4 to 10 parts by weight of foaming agent, 4 to 10 parts by weight of sodium hydroxide, and 1 to 8 parts by weight of polyvinyl alcohol. . The building porous ceramic interior and exterior composition according to claim 1, wherein the glass powder is at least one selected from the group consisting of soda lime glass, borosilicate glass, aluminum silicate glass, and lead glass. The building porous ceramic interior and exterior composition according to claim 1, wherein the inorganic filler is zeolite, wood clay or a mixture thereof. According to claim 1, wherein the blowing agent is a porous ceramic interior and exterior building construction, characterized in that the calcium carbonate, calcium phosphate or calcium hydrogen phosphate. Mixing 60 to 80 parts by weight of the glass powder, 20 to 40 parts by weight of the inorganic filler, and 4 to 10 parts by weight of the blowing agent to obtain a mixed powder; Adding 4 to 10 parts by weight of sodium hydroxide and 1 to 8 parts by weight of polyvinyl alcohol to the mixed powder by adding an aqueous solution dissolved in 10 to 30 parts by weight of water with respect to 100 parts by weight of the total solid content to obtain a mixture by wet mixing; And After extrusion molding the mixture, it is loaded on a shelf plate, stacked in several stages and dried at 90 to 150 ℃ for at least 8 hours, and then baking the building method for manufacturing a porous ceramic interior and exterior material for building.