KR20100003920A - Foamed glass having highstrength property and method of producing the same - Google Patents

Abstract

PURPOSE: A foaming glass of high intensity containing alkali glass and non-alkali glass as active ingredients is provided. CONSTITUTION: A composition for producing foaming glass of high intensity comprises: 60-95 weight parts of alkali glass, 1-20 weight parts of foaming agent, and 5-40 weight parts of non-alkali glass. The alkali glass contains: complex of silicon dioide(SiO2), aluminum oxide(Al2O3), sodium oxide(Na2O), and potassium oxide(K2O); complex of calcium oxide(CaO) and magnesium oxide(MgO). The non-alkali glass contains silicon dioxide(SiO2), aluminum oxide(AL2O3), boron oxide(B2O3), calcium oxide(CaO), and magnesium oxide(MgO).

Description

High-strength foamed glass and its manufacturing method {FOAMED GLASS HAVING HIGHSTRENGTH PROPERTY AND METHOD OF PRODUCING THE SAME}

The present invention is a composition for producing a high strength foam glass comprising an alkali-based glass, an alkali-free glass and a blowing agent; High-strength foam glass prepared by foaming the composition; And to a method for producing the foam glass

Foamed glass is a composite of glassy solid phase and gaseous (bubble or pore) phase, and has characteristics such as light weight, heat insulation, moisture resistance, heat resistance, corrosion resistance, and the like, and thus has been commercialized in various countries.

In particular, these days, because the waste resources can be recycled and recycled after disposal, foamed glass is manufactured by using waste glass bottles or waste glass as a foaming raw material through a process such as coarse grinding or pulverizing. Foamed glass is mostly made from alkaline waste glass. However, foamed glass products manufactured using the alkali-based waste glass as a raw material have a problem in that strength is weakened because many pores are formed in the product. Due to the nature of the glass, since the original color or composition is formed of various glass particles having different compositions, there is a problem that the cracking phenomenon may easily occur due to different expansion coefficients and different melting temperatures.

On the other hand, alkali-free waste glass, such as LCD and PDP, or its fine powder is not recycled and is classified as industrial waste.

The present invention has been made in view of the above-described point, and an object thereof is to provide a high-strength foam glass made of alkali glass and alkali-free glass as a raw material.

The present invention for achieving the above object is a foamed glass containing 60 to 95 parts by weight of alkali-based glass, 5 to 40 parts by weight of alkali-free glass and 1 to 20 parts by weight of foaming agent with respect to 100 parts by weight of glass material. It provides a composition for preparation.

In addition, it provides a high-strength foam glass prepared by foaming the foam composition for producing a glass according to the present invention.

In addition, it provides a high strength foam glass manufacturing method.

As described above, the high-strength foamed glass produced by foaming the composition for producing a high-strength foamed glass containing an alkali-based glass and an alkali-free glass as an active ingredient has an effect of exhibiting strength superior to that of conventional foamed glass.

In addition, there is an environmentally friendly element and cost reduction effect by recycling the alkali-free waste glass.

Hereinafter, the present invention will be described in detail.

The composition for producing foamed glass according to the present invention is characterized by including not only alkali-based glass but also alkali-free glass as a raw material.

In order to manufacture foamed glass using alkali-free glass as a raw material, foaming process is required at high temperature, and expensive special foaming agent must be used. Thus, foamed glass based on alkali-free glass has not been manufactured until now. not. MEANS TO SOLVE THE PROBLEM The present inventors conducted numerous research and experiment in order to improve the intensity | strength of foamed glass, and, as for the foamed glass manufactured from the composition for foaming glass manufacture containing alkali-type glass and an alkali free glass, alkali-type glass is included independently. It was found that the strength is superior to the foamed glass prepared with the composition for producing a foamed glass. In addition, when mixing and using the said alkali type glass and the alkali free glass, foaming is possible at the foaming temperature of alkali type glass, without an expensive special foaming agent.

Accordingly, the present invention not only provides a high strength of the foam glass, are embedded in the current amount, which can take advantage of the non-alkali glass waste which are not being recycled foam provides a composition for preparing glass.

Foamed glass is a material that foams homogeneous pores in glass to have both physical and organic properties of the glass itself. Since the foam glass is made of discarded glass or the like as a raw material, it is an environmentally friendly material capable of recycling waste resources and recycling after disposal. In addition, it has a high light weight due to the homogeneous bubble of the material, has a high sound insulation to block and absorb noise and vibration, and in addition, there is insulation of heat insulation, heat insulation, high fire resistance and non-combustibility, steel acid resistance and corrosion resistance of steel. There is a characteristic, and has the advantage of easy processing.

The composition for producing a foamed glass of the present invention includes 60 to 95 parts by weight of alkali-based glass, 5 to 40 parts by weight of alkali-free glass and 1 to 20 parts by weight of the blowing agent based on 100 parts by weight of the glass material.

The alkali-based glass of the present invention is a composite of SiO ₂ (silicon dioxide), Al ₂ O ₃ (aluminum oxide), Na ₂ O (soda) and K ₂ O (potash), CaO (calcium oxide) and MgO (oxidation). Magnesium) as a component, for example, SiO ₂ It may have a composition of 72-75%, Al ₂ O ₃ 1.5-2.5%, 12-14% of the complex of Na ₂ O and K ₂ O, 10-12% of the complex of CaO and MgO. Foaming temperature of the said alkali type glass is about 750-900 degreeC. The alkali-based glass, preferably from 60 to 95 parts by weight with respect to 100 parts by weight of the glass material in the composition for producing foamed glass according to the present invention. If less than 60 parts by weight is not sufficient foaming can be difficult to form a lightweight foam glass. On the other hand, the alkali glass may be used waste alkali glass or fine powder thereof.

The alkali free glass of the present invention is composed of a composite of SiO ₂ (silicon dioxide), Al ₂ O ₃ (aluminum oxide), B ₂ O ₃ (boron oxide), and CaO (calcium oxide) and MgO (magnesium oxide) as components. As an example, SiO ₂ 60-70%, Al ₂ O ₃ 13 to 18%, B ₂ O ₃ 8 to 13%, it may have a composition of 5-15% of the composite of CaO and MgO. Compared with alkaline glass, an alkali free glass can contain a large amount of not only boron oxide but an aluminum oxide component. When the content of aluminum oxide (Al ₂ O ₃ ) in the glass increases, the mechanical strength (particularly tensile strength) due to the increase of the elastic modulus is enhanced, and the surface strength is increased. In addition, boron oxide (B ₂ O ₃ ) contained in the glass increases chemical resistance, in particular, acid resistance and weather resistance, and the coefficient of thermal expansion can be reduced, thereby improving thermal shock resistance. Foaming temperature of the said alkali free glass is 950 degreeC or more. The alkali free glass may be included in an amount of 5 to 40 parts by weight based on 100 parts by weight of the glass material in the composition for producing a foamed glass according to the present invention. If less than 5 parts by weight may be difficult to produce a high-strength foam glass, if it exceeds 40 parts by weight may not have sufficient foaming at the foaming temperature according to the present invention may be difficult to produce a foamed glass. On the other hand, the alkali-free glass may be used waste alkali-free glass (LCD glass panel, PDP glass panel) or fine powder thereof.

The blowing agent contained in the composition for producing a foamed glass of the present invention can be used without limitation as long as it releases a gas component while decomposing at the melting temperature (softening temperature) of the alkali-based glass. Liquid or solid calcium phosphate, calcium carbonate, carbon, sodium carbonate, silicon carbide, iron oxide, antimony oxide, arsenic oxide, calcium hydrogen phosphate, or mixtures thereof, and the like, depending on the type of blowing agent, preferably glass material 100 1 to 20 parts by weight may be used with respect to parts by weight, but when it is less than 1 part by weight, when forming foam glass, the molding strength may drop and the specific gravity may be excessively increased. When the amount is more than 20 parts by weight, the bubble tissue becomes large and uneven. This is because a problem of lowering strength may occur.

The composition for producing foamed glass according to the present invention may further contain one or more selected from the group consisting of kaolin, coal ash, limestone, inorganic binder, organic binder, caustic soda to improve foaming and formability.

The kaolin may be used to impart plasticity to the composition and maintain specific gravity and porosity. The smaller the particle size of the kaolin has the effect of decreasing the specific gravity and increasing the porosity, and preferably, for the strengthening of moldability, a particle size of 180 μm or less can be used. In addition, the composition for producing foamed glass may be used in an amount of 20 parts by weight or less, preferably 10 parts by weight or less, based on 100 parts by weight of the glass material. If it exceeds 10 parts by weight, it is because the specific gravity of the foamed glass to be produced may increase rapidly.

The coal ash may be used as a filler and a foaming aid. Fly ash contains unburned carbon and SO ₂ gas, which can act as a blowing agent. It can be used in 20 weight part or less, Preferably it is 10 weight part or less with respect to 100 weight part of glass materials in the composition for foaming glass manufacture. When added to less than 10 parts by weight may serve as a foaming aid, but more than that will increase the specific gravity due to the reduction of the glass content.

The limestone can be used for the purpose of reducing specific gravity and increasing porosity. The smaller the particle size of limestone, the lower the specific gravity and the higher the porosity. When the particle size of the limestone is smaller than that of the foamed mechanism glass, the pore formation is more advantageous. Therefore, it is preferable to use one having the particle size of the glass to be used. The composition may be used in an amount of 10 parts by weight or less based on 100 parts by weight of the glass material in the composition for producing a foamed glass.

Sodium silicate (water glass) or the like may be used as the inorganic binder, and PVA aqueous solution or methyl cellulose aqueous solution may be used as the organic binder. In the case of soda silicate (water glass), it can be used to increase the foaming rate, decrease the specific gravity, and in particular, increase the pore size in the total porosity. The organic binder may be used as a binder for forming a molded body. 20 parts by weight or less may be used with respect to 100 parts by weight of the glass material in the composition for preparing a foamed glass, and preferably 3 to 10 parts by weight.

The caustic soda may be used if necessary to reduce the sintering temperature and to reduce specific gravity, or to increase the open porosity. The composition for producing foamed glass may be used in an amount of 20 parts by weight or less, preferably 10 parts by weight or less, based on 100 parts by weight of the glass material. This is because, when 10 parts by weight or more is included, durability deterioration and whitening may occur.

In addition, the present invention provides a high-strength foam glass produced by foaming the composition for producing the foam glass according to the invention.

The foamed glass according to the present invention is first reacted with the alkali-free glass while the softened alkali-based glass is foamed, thereby Al ₂ O ₃ at the interface of the alkali-free glass particles. And a solid solution containing a B ₂ O ₃ component. Therefore, the foot nursing according to the present invention having the above-described interfacial structure has better mechanical strength than foamed glass made only of alkali-based glass (see Fig. 1).

Since the strength of the foamed glass according to the present invention is preferably 20 ~ 30 kgf / cm ² , the strength of the foamed glass produced only with alkali-based glass is much superior to that of 5 ~ 10 kgf / cm ² It can be seen (see Experimental Example 1).

The present invention also provides a foamed glass by foaming a composition for producing a foamed glass comprising a) an alkali-based glass, b) an alkali-free glass having a higher foaming temperature than the alkali-based glass and c) a foaming agent at a predetermined temperature. In the above, the foaming temperature is the same as or higher than the foaming temperature of the alkali-based glass, and provides a high-strength foamed glass manufacturing method, characterized in that lower than the foaming temperature of the alkali-free glass.

In the present invention, the alkali-based glass particles are first softened to have fluidity, and the solid solution containing Al ₂ O ₃ and B ₂ O ₃ components at the interface of the alkali-free glass particles by reacting with the alkali-free glass without softening. It is characterized by the production of high strength foam glass.

Therefore, since the foaming temperature of the alkali-based glass is 750 ~ 950 ℃, the foaming temperature of the alkali-free glass is 950 ℃ or more, by producing a foamed glass at the foaming temperature of 750 ~ 950 ℃, high-strength foamed glass according to the present invention Can be prepared.

Except for the combination of the alkali-based glass and the alkali-free glass and the content of the foaming temperature, it is possible to manufacture the foamed glass according to the general foamed glass manufacturing method.

First, the raw materials may be pulverized to an appropriate particle size, followed by performing a combination and mixing process, and molding the combined raw materials, and then performing foam firing, thereby manufacturing a foamed glass according to the present invention.

In the pulverization process, each raw material may be coarsely pulverized using a pulverization means such as a hammer crusher, and finely pulverized by a ball mill, but the pulverization method is not limited thereto.

The mixing step is performed by uniformly mixing the pulverized glass, blowing agent and additives with a mixer.

In the molding step, the mixture may be molded into a granular shape or a spherical shape by an extruder, a fan pelletizer, or the like, and may be molded into a plate shape by filling the mixture into a metal mold.

In the firing process, rotary kiln may be used for plastic foaming of spherical particles, and in the case of plate type, the kiln may be fired using a tunnel kiln or a box. For the production of high-strength foam glass according to the present invention, the temperature in the firing process is the same as or higher than the softening temperature of the alkali-based glass included as a raw material, and can be fired and foamed to be lower than the softening temperature of the alkali-free glass. have.

By performing the above process, it is possible to produce a high strength foam glass according to the present invention.

In addition, the present invention provides a composite prepared by mixing any one of gypsum, cement, lightweight foam concrete, metal panel and gypsum panel to the foamed glass produced by the high-strength foam glass composition according to the present invention.

After mixing with water and gypsum, after mixing the foamed glass, preferably spherical foamed glass according to the present invention and mixed again to prepare a plate-like, gypsum and foamed glass composite can be prepared.

In addition, by mixing the cement and the foamed glass and then manufactured in a plate shape, it is possible to produce a composite of cement and foamed glass.

In addition, water and a foaming agent is added to the cement and mixed with the foamed glass, and then manufactured in a plate shape to produce a composite of lightweight foamed concrete and foamed glass.

In addition, by forming a molded foam product made of foamed glass in a plate form, by applying an adhesive between one side of the metal panel or between the panel (panel) and attaching, the metal panel and the foamed glass composite can be produced. In manufacturing the foamed glass in the form of a plate, an organic or inorganic binder may be used.

In addition, by attaching a foam molded product prepared in the form of a plate by combining the foam glass, by applying an adhesive to the one side of the gypsum panel or between (panel) and the panel, the gypsum panel and foam glass composite can be produced. In manufacturing the foamed glass in the form of a plate, an organic or inorganic binder may be used.

The composite prepared as described above may be used in various applications such as insulation, sound absorbing material and building walls.

Hereinafter, the present invention will be described in more detail with reference to Examples and Experimental Examples. However, the following examples are illustrative of the present invention, and the contents of the present invention are not limited by the examples.

< Example  1>

Preparation Example 1 Manufacture of Foamed Glass

Alkaline-type glass (soda lime glass) which is glass bottle waste glass was pulverized with a grinder so that LCD-alkali waste glass might also be 200 micrometers or less so that it might become 200 micrometers or less. 75 g of alkali glass, 20 g of LCD glass, and 3 g of limestone were mixed, but the mixture was sufficiently mixed until the mixture was uniform. The obtained particulate glass mixture was put into a pan pelletizer and sprinkled with binder (Sodium Silicate (5% per 100 glasses)) to prepare a particulate glass mixture in a spherical shape. The molded product was dried by firing and then quenching in a rotary kiln at a temperature in the range of 800 ~ 850 ℃, to prepare a foam glass having a specific gravity of 0.30, strength 20 ~ 30 kgf / cm ² .

Comparative Example 1

Instead of using an alkali free waste glass, foamed glass was prepared in the same manner as in Production Example 1, except that soda-lime glass was used in an amount of 95 g in total.

< Experimental Example  1>

The strength of the foamed glass prepared in Preparation Example 1 and Comparative Example 1 was measured. The prepared foamed glass was divided according to the particle size (2 mm or less, 2-4 mm, 4-6 mm, 8 mm or more), and the strength of each particle size was measured three times, and the total average value is shown in Table 1 below. Strength measurements were performed using lightweight aggregates (DIN en 13055-1) in kgf / cm ² .

burglar Preparation Example 1 20-30 Comparative Example 1 5-10

As shown in Table 1, the foamed glass prepared by Preparation Example 1 can be confirmed that the strength is significantly superior to the foamed glass prepared in Comparative Example 1.

< Example  2>

Preparation of Gypsum and Foamed Glass Composites

By-product gypsum (Isu gypsum) was calcined at 130 ~ 150 ° C, after the manufacture of hemihydrate gypsum 1kg and water 1kg was mixed, 0.4kg foam glass prepared in Preparation Example 1 was mixed.

The mixed mixture was mixed for 1 minute and placed in a square mold to prepare a plate, and then cured to prepare a gypsum and foam glass composite.

< Example  3>

Preparation of Cement and Foamed Glass Composites

After mixing 1.5 kg of Portland cement and 0.5 kg of water, 0.2 kg of the foamed glass prepared in Preparation Example 1 was mixed.

The mixed mixture was put into a square mold to form a plate and then cured in air or water to prepare a cement and foam glass composite.

< Example  4>

Fabrication of Lightweight Foamed Concrete and Foamed Glass Composites

After mixing 1 kg of cement and 0.2 kg of water, the mixture was mixed with 0.5 kg of water, 0.01 kg of water-soluble cellulose ethers as a thickener, and 0.01 kg of neutralized vinzolesine as an air entrainer, mixed and mixed to generate bubbles. 0.4 kg of the foamed glass prepared in Preparation Example 1 was mixed in a state where bubbles were generated.

The mixed mixture was mixed for 1 minute to prepare a plate and then cured to prepare a foamed composite of lightweight foam concrete and foam.

< Example  5>

Manufacture of Metal Panel and Foamed Glass Composite

The foamed glass prepared in Preparation Example 1 was mixed with 2 to 5 ml of Sodium Silicate aqueous solution (20%), put into a square mold, and bonded at 750 to 800 ° C. to prepare a plate.

The adhesive was applied to one side of the prepared metal panel or the sintered foam glass composite (panel) between the panel and the panel to prepare a metal panel and the foam glass composite.

< Example  6>

Preparation of Gypsum Board Panel and Foamed Glass Composite

The foamed glass prepared in Preparation Example 1 was mixed with 2 to 5 ml of Sodium Silicate aqueous solution (20%), put into a square mold, and bonded at 750 to 800 ° C. to prepare a plate.

Adhesive plaster was applied to one side of the prepared gypsum panel or the sintered foam glass composite (panel) between the panel and the panel to prepare a gypsum board and foam glass composite.

1 is a view schematically showing the structure of foamed glass particles according to an embodiment of the present invention (A: alkali-based glass, B: alkali-free glass particles, C: bubbles).

Figure 2 is a photograph of the foam glass prepared according to an embodiment of the present invention.

Claims (17)

A composition for producing high-strength foam glass, including 60 to 95 parts by weight of alkali-based glass, 5 to 40 parts by weight of alkali-free glass, and 1 to 20 parts by weight of blowing agent, based on 100 parts by weight of the glass material. The method of claim 1, wherein the alkali-based glass is SiO ₂ (silicon dioxide), Al ₂ O ₃ (aluminum oxide), Na ₂ O (soda) and a composite of K ₂ O (potash) and CaO (calcium oxide) and A composition for producing high strength foam glass, comprising a composite of MgO (magnesium oxide) as a component. The method of claim 1, wherein the alkali-free glass is a composite of SiO ₂ (silicon dioxide), Al ₂ O ₃ (aluminum oxide), B ₂ O ₃ (boron oxide) and CaO (calcium oxide) and MgO (magnesium oxide) A composition for producing a high strength foam glass, comprising as a component. According to claim 1, The foaming temperature of the alkali-based glass is a composition for producing high-strength foam glass of 750 ~ 900 ℃. The composition of claim 1, wherein the foaming temperature of the alkali-free glass is 950 to 1300 ° C. The method of claim 1, wherein the blowing agent is one or a mixture of two or more selected from the group consisting of liquid or solid calcium phosphate, calcium carbonate, carbon, sodium carbonate, silicon carbide, iron oxide, antimony oxide, arsenic oxide, calcium hydrogen phosphate High-strength foam glass composition characterized in that. The composition for producing high strength foam glass according to claim 1, further comprising at least one selected from the group consisting of kaolin, coal ash, limestone, inorganic binder, organic binder and caustic soda. The composition according to claim 1, wherein the alkali-based glass or the alkali-free glass is waste glass. The waste glass of the alkali-based glass is at least one selected from waste bottle glass, automotive headlight waste glass and microwave oven waste glass, the waste glass of the alkali-free glass is waste glass for LCD Composition for producing high strength foam glass, characterized in that the panel or waste glass panel for PDP. A high strength foamed glass prepared by foaming the composition for producing a high strength foamed glass according to any one of claims 1 to 9. The high strength foamed glass according to claim 10, wherein the foaming of the composition is performed at a temperature equal to or higher than the foaming temperature of the alkali-containing glass and lower than the foaming temperature of the alkali-free glass. The method according to claim 10, wherein by the difference in the foaming temperature of the alkali-based glass and the alkali-free glass contained in the composition for producing a foamed glass, the alkali-softened glass is first foamed while reacting with the alkali-free glass and alkali-free glass particles A high-strength foam glass, characterized in that a solid solution containing Al ₂ O ₃ and B ₂ O ₃ components is formed at the interface thereof to exhibit high strength. The high strength foam glass according to claim 10, wherein the foam glass has a strength of 20 to 30 kgf / cm ² . In manufacturing the foamed glass by foaming the composition for producing a high-strength foamed glass according to any one of claims 1 to 9 at a predetermined temperature, the foaming temperature is equal to or higher than the foaming temperature of the alkali-based glass, the alkali-free A high strength foam glass manufacturing method, characterized in that lower than the foaming temperature of the glass. The method according to claim 14, wherein the foaming temperature is 750 ~ 900 ℃. A composite prepared by mixing any one of gypsum, cement, lightweight foam concrete, metal panels and gypsum panels to the foam glass of claim 10. 17. The composite of claim 16, wherein the composite is used for any one or more of thermal insulation, sound absorbers, and blocks.

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