KR940000722B1 - Process for preparation of multiple coating foaming grass - Google Patents

Abstract

The multi-layer foamed glass is mfd. by (a) mixing 100 wt. pts. of soda lime glass-crushed material with 0.3-0.4 wt. pts. of calcium carbonate and 3.0-5.0 wt. pts. of water glass to obtain a granular base foamed layer (A), (b) mixing 100 wt. pts. of soda lime glass with 0.2-0.3 wt. pt of calcium carbonate, 0.5-2.0 wt. pts. of inorganic pigment, 1.0-2.5 wt. pts. of clay and alumina and 3.0-4.0 wt. pts. of water glass to obtain a granular color foamed layer (B), (b) laminating layers (A,B) and a glassy coated layer (C) in the guide mold, and press-molding the laminated layers, and (c) melt-foaming them. The glass is used for a building material.

Description

Multilayer Foam Glass Manufacturing Method

1 is a cross-sectional view of the product configuration of the multi-layered foam glass of the present invention. ① clear glassy coating layer, ② color foam layer, ③ base foam layer.

Figure 2 is a 100 times electron micrograph of the pore structure of the base foam layer fracture surface of the multi-layer foamed glass of the present invention.

The present invention relates to a method for manufacturing multilayer foamed glass for building interior and exterior materials, which is extremely excellent in thermal insulation, plastering, sound insulation, processability and workability by utilizing a variety of waste glass which is a glass industry waste that can cause environmental pollution.

As a conventional foam glass manufacturing method, as described in Japanese Patent Laid-Open Nos. 58-60634, 5959999943, and 61-2618, the main raw material of soda lime glass is pulverized to 50 μm or less, and then limestone, dolomite or carbon After mixing the blowing agent and forming granular form using water glass or PB (POLY-VINYL-ALCOHOL) as a binder, filling it into a molding die and foaming it in the firing furnace and molding as in Japanese Laid-Open Patent No. 57-178807 There is a method of making a product by continuously accumulating the above raw materials on a mesh belt and foaming them in a kiln to slow cooling. However, these foamed glass is weak to external impact and has large pore size, so the surface hardness is also weak and not decorative, so it is not suitable for use as interior and exterior materials of building finishing materials. In order to improve these disadvantages, Japanese Laid-Open Patent No. 63-233020 added sinterable additives feldspar wollastonite mullite on the foamed layer to improve the surface hardness, thereby increasing the mechanical weight by increasing the specific gravity of the powder. So 59-111948 proposed a method of forming a transparent glass layer by glazing on a foamed glass base. However, there is a problem that the manufacturing cost is increased by two heat treatment processes. Coarse grinding Sikyeoteuna to form a glass layer laminated on the cooling process during foaming chunggwa glassy coating volume difference between the cracking of the glass coating layer, and the longer the thermal shock property is weakened gradually cooled time low productivity problem because the shrinkage caused by the difference of the specific gravity of the chunggwa.

Therefore, the present invention solves the problems of the conventional foam glass, which has been used as the plant insulation, insulation or building insulation, and improved mechanical strength and thermal shock resistance while simplifying the manufacturing process, and color foaming between the base foam layer and the transparent glass layer. Formed layer prevents cracking of glass coating layer and base foaming layer due to shrinkage rate, and also adds plastering, which is an important element of building interior and exterior materials, and manufactures interior and exterior building materials with excellent processability and construction, thereby adding to the recycling of waste in the glass industry. The present invention relates to a method for manufacturing a multilayer foamed glass that has achieved industrial effects.

Hereinafter, the present invention will be described in detail.

The glass shreds used in the present invention were prepared using soda lime glass, which is usually automobile glass and soda lime glass. After crushing 100 parts by weight of the glass crushed to 100μm or less and mixed with 0.3-0.4 parts by weight of calcium carbonate as a blowing agent, after mixing is complete, add 3.0-5.0 parts by weight of water glass as a binder, and then remix It is made into granules of 3 mm or less, and is used as the base foam layer raw material. The color foam layer comprises 100 parts by weight of the glass powder as a blowing agent, 0.2-0.3 parts by weight of calcium carbonate and 0.5-2.0 parts by weight of an inorganic pigment to obtain a desired color. In order to increase mechanical strength and thermal shock resistance, 1.0-3.5 parts by weight of clay and alumina are added, 3.0-4.0 parts by weight of water glass is added as a binder, followed by remixing to form granules having a particle diameter of 3 mm or less as a raw material of color foaming layer. The transparent vitreous coating layer is pulverized so that the transparent soda lime glass lysate to have a size of 1-3mm as a raw material.

The raw materials prepared as above are laminated in the order of base foam layer, color foam layer, and transparent glass coating layer on the refractory board on which the guide molds for assembly and disassembly are mounted, and then press the molding press at a pressure of 3-5Kg / ㎠. After molding, the guide mold is dismantled and removed, and then transferred to a kiln in a state where the fireproof plate is covered to be in close contact with the upper surface of the molded product in order to maintain the smoothness of the surface and the thickness of the product. The temperature of the kiln is raised to 10 ° C per minute as a heating step until the softening temperature of soda-lime glass and the thermal decomposition starting temperature of calcium carbonate, a blowing agent, is 10 ° C per minute, and the glass powder is softened and fused before calcium carbonate is pyrolyzed. After holding at 720 ℃ for 15-20 minutes, the thermal decomposition of calcium carbonate, a blowing agent, is completed, and the temperature is no longer generated.The temperature is raised to 5 ℃ per minute to 850 ℃, so that CO ₂ gas is sufficiently decomposed and sintered and fused. After the firing and foaming process is completed, the slow cooling is performed according to the slow cooling method of general glass products after the firing and foaming process is completed. The pore tool is cooled by 3-5 ℃ per minute to avoid the temperature difference between the foam layer and the transparent glass coating layer. It is possible to obtain a multi-layered foamed glass having an independent foam layer of the bath, and this independent foaming layer has excellent thermal insulation and sound insulation, and also has excellent workability due to light weight.

In the foaming process, after the glass powder is sintered and fused at a temperature on the softening point, calcium carbonate, which is a foaming agent, is thermally decomposed to generate CO ₂ gas, and a large number of pores in the softened glass exist to form a foam layer. Since this size is large, the specific gravity of the foam layer is small, so that the insulation is excellent, but the mechanical strength is lowered. In order to maintain heat insulation and light weight, it is preferable to maintain the volume ratio of the base foam layer at 0.6-0.8 g / cm 3, and to maintain the volume ratio, 3.0-5.0 parts by weight of water glass having 0.3-0.4 parts by weight of binder is added. In order to prevent cracking and improve adhesion between the base layer and the glass coating layer during the cooling process, It is recommended to add 1.0-2.5 parts by weight of clay and alumina in order to maintain the volume specific gravity of the color foam layer at 0.8-1.8 g / cm3 and to increase the mechanical strength and thermal shock resistance. When 0.5-2.0 parts by weight of the compound is added and heat-treated and polished according to the above-described method, a light weight multilayer foamed glass having pore structures independently and having various shades on the surface can be produced.

Example 1-4

In accordance with the composition of Table 1, the glass powder source was manufactured using automobile glass, which is usually soda-lime glass, and soda-lime glass, which is a bottle glass crushed product. The glass crushed product was pulverized to 100 μm or less, and then calcium carbonate 0.3- was used as a blowing agent. After adding 0.4 parts by weight, the mixture is mixed. After mixing is completed, 3.0-5.0 parts by weight of water glass is added, followed by re-mixing to form granules having a particle diameter of 3 mm or less to form a base foam layer.

The color foam layer is added 0.2-0.3 parts by weight of calcium carbonate as a blowing agent to the glass powder, and 0.5-2.0 parts by weight of inorganic pigment is added to obtain a desired color, and mutual adhesion and mechanical strength of the base foam layer and the color foam layer. And 1.0-2.5 parts by weight of clay and alumina are added to increase the thermal shock resistance, and 3.0-4.0 parts by weight of water glass as a binder is added and remixed into granules having a particle size of 3 mm or less. The transparent vitreous coating layer is pulverized so that the transparent soda lime glass crushed to 1-3mm size as a raw material.

The raw materials prepared as above are laminated in the order of 65-70% of the base foam layer, 20-25% of the color foam layer, and 10% of the transparent glass coating layer on the refractory plate on which the guide mold which can be assembled and disassembled is placed. After molding by using the pressure of 3-5kg / ㎠, the guide mold is dismantled and removed and transported to the kiln in the state of covering the fireproof plate to be in close contact with the upper surface of the molded product to maintain the surface smoothness and the thickness of the product. do. The temperature of the kiln is preheated up to 10 ℃ / min as a preheating step up to 720 ℃, the softening temperature of soda-lime glass and the thermal decomposition starting point of calcium carbonate, a blowing agent, so that the glass powder can be softened and fused sufficiently before the calcium carbonate is pyrolyzed. After holding at 720 ℃ for 15-20 minutes, the thermal decomposition of calcium carbonate, the blowing agent, is completed, and the temperature is no longer generated.The temperature is raised to 5 ℃ / min up to 850 ℃, and the CO ₂ gas is sufficiently decomposed and sintered and fused. After the firing and foaming process is completed, the slow cooling is performed according to the slow cooling method of general glass products after the firing and foaming process is completed. Cooling was performed at 3-5 ° C. per minute so that a temperature difference between the layer and the transparent glassy coating layer did not occur.

TABLE 1

[Comparative Example 1-4]

Compounds combined in the composition ratios of Table 2 were heat-treated under the process and temperature conditions of Example 1-4 and polished to prepare a foamed glass having no color layer and a colored foamed glass having a different composition ratio.

TABLE 2

According to the items of Table 3, foamed glass made of the composition of Table 1 to Table 2, the bending strength was measured on a three-point load-type strength meter of 10 × 10 × 60 mm specimens, and the bending strength was measured by the model 82395 of Shimadzu Corporation. As shown in Table 3, the multi-layered foamed glass is prevented from cracking of the glass coating layer, and it can be confirmed that the multi-layered foamed glass has mechanical strength, light weight and plasticity.

TABLE 3

In addition, in the result of Table 3, in Comparative Example 1, cracks occurred in the glass coating layer due to the difference in the specific gravity of the foam layer and the specific gravity of the glass coating layer. It is deteriorated and is not an important component of a building finishing material, and Comparative Example 3 is not suitable for building interior and exterior materials because the mechanical strength is small due to the small crack and total specific gravity of the glass layer. In Comparative Example 4, too, cracks occurred in the glass coating layer, and the specific gravity and the total specific gravity of the base foam layer were large, so that the heat insulating property and the light weight were reduced.

Claims (3)

100 parts by weight of soda-lime glass crushed product, 0.3-0.4 parts by weight of calcium carbonate, 3.0-5.0 parts by weight of water glass, granular base foam layer and 100 parts by weight of soda-lime glass, calcium carbonate 0.2-0.3 Part by weight, inorganic pigment 0.5-2.0 parts by weight, clay and 1.0-2.5 parts by weight of alumina 3.0-4.0 parts by weight of water glass, granular color foam layer manufactured with a particle diameter of 3mm or less and a glass coating layer of 1-3mm size A method for producing a multilayer foamed glass, characterized in that it is sequentially laminated in a mold, press-molded, and then calcined to melt foam. The multilayer film according to claim 1, wherein the base foam layer is 65-70%, the color foam layer 20-25%, and the transparent glass coating layer 10% thick. Method for producing foamed glass. The method of claim 1, wherein the melt-foaming treatment in the kiln is heated to 10 ° C. per minute up to 720 ° C., held at 720 ° C. for 15-20 minutes, and then heated to 5 ° C. per minute to 850 ° C., and 30 to 850 ° C. Method for producing a multi-layer foamed glass characterized by cooling for 3-5 minutes per minute after the foaming treatment by holding for a minute.