JP2002226224A - Decorative glass and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a decorative glass with a natural stone pattern, especially a granite type pattern, which is producible and enables to do post-work such as bending. SOLUTION: In manufacturing a decorative glass, crystalline glass particles and cullet composed of non-crystalline glass, are mixed, sintered, and cooled gradually. Crystalline glass particles and cullet particles made of non-crystalline glass are controlled to have 5600 μm or less grain sizes, and a weight ratio of cullet to crystalline glass particles (cullet/crystalline glass particles) is controlled in the range of 1.5 or more and 4 or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a granite, that is, a glass panel having a natural stone pattern such as granite or marble.
The present invention relates to a decorative glass such as a glass tile and a glass block and a method for producing the same.

[0002]

2. Description of the Related Art Granite, which is a kind of coarse-grained crystalline acid plutonic rock, and marble, which is a kind of limestone, have beautiful surfaces when polished, and are used as decorative materials for building materials and sculptures. I have been.

[0003] Granite is a coarse-grained crystalline rock commonly known as granite, whose main component is quartz, potassium feldspar, plagioclase, mica, and amphibolite. It has various patterns depending on the ratio, the size of the coarse particles, and the color development due to the influence of impurities such as Mn. On the other hand, marble is a type of limestone that can be polished and used as a decorative material.It is a combination of crystalline and non-crystalline materials. There are things with.

[0004] However, in order to make these natural stones into a building material having a beautiful surface, they must be cut into desired dimensions and then polished. Inexpensive alternatives that mimic the natural stone pattern using moldable acrylic resin or crystallized glass have been manufactured and used as building materials instead of natural stone.

Various methods for producing a decorative glass having a natural stone pattern such as granite or marble by using crystallized glass are known, and are disclosed in JP-A-63-144142 and JP-A-Hei.
JP-A-317374, JP-A-5-163035, JP-A-6-340438, JP-A-10-25
No. 133, Japanese Patent No. 2611546 and the like.

For example, a plurality of crystalline glass particles are accumulated in a mold of a refractory, and are heat-treated to fuse and integrate the crystalline glass particles with each other. The crystallized glass obtained by the so-called accumulation method, which precipitates, exhibits a natural stone pattern such as granite or marble when the surface is polished, and has mechanical strength, thermal shock resistance, and chemical durability such as acid resistance and alkali resistance. Because of its excellent properties, it is commercially available as a building material.

On the other hand, a decorative glass having a natural stone pattern is not obtained, but a decorative glass made of amorphous glass powder such as a decorative glass panel, a decorative glass tile, and a decorative glass block. Various production methods are known. For example, a method for producing a glass cullet obtained by pulverizing a sheet glass, a glass bottle or the like and / or a decorative glass using only glass powder as a raw material is disclosed in
No. 4, JP-A-52-78211 and JP-A-60-1982.
These are disclosed in, for example, JP-A-151236 and JP-A-3-193632.

[0008]

However, decorative glass using crystalline glass particles as a raw material has a natural stone pattern such as granite or marble, but crystallographic glass particles are fused and integrated to grow crystals. In order to obtain decorative glass by heating, a high temperature of 1000 ° C. or more is required. Further, when crystals are precipitated in crystalline glass particles, there is a problem that the volume shrinks and the dimensional stability is inferior. To do so, it was necessary to make a large size in the mold, and then grind the surface other than the decorative surface to obtain accurate dimensions.

Further, when a surface is polished to obtain a granite-like or marble-like natural stone pattern, the crystallized glass is hard to be polished because it is hard. A decorative glass panel using crystalline glass particles as a raw material has a softening point. High, it is difficult to bend after production to obtain a curved surface, compared to acrylic marble-like panels etc.
Although excellent as a building exterior wall material, it was inferior in moldability, making it difficult to use as a building interior material. Also,
Since crystalline glass is used as a raw material, there are problems such as a high price.

On the other hand, if only cullet mainly composed of amorphous glass such as inexpensive soda lime silicate glass is used, the sintering temperature can be reduced and the surface of the decorative glass obtained is smooth. However, it is difficult to obtain a white granular portion due to crystals, which is indispensable as a characteristic of the natural stone pattern, and it has been difficult to obtain a natural stone pattern.

[0011] It has been attempted to produce a natural stone-patterned decorative glass by mixing the cullet with an aggregate such as silica sand, a cement such as slag, and a viscosity. Must be finely pulverized to obtain fine glass powder.
Requires a high sintering temperature of 000 ° C. or higher. Furthermore, in order to smooth the surface, it is necessary to perform a heating and pressing treatment using a press or the like.

[0012]

SUMMARY OF THE INVENTION The present invention relates to a decorative glass having a natural stone pattern obtained by mixing crystalline glass grains and a cullet made of an amorphous glass such as soda lime silicate glass and then sintering the mixed glass. The method, the surface of the sintered sintered glass, the white portion by the crystallized glass crystallized crystalline glass, the contrast of the other portion of the cullet, natural stone pattern, especially granite-like decorative glass Is provided.

In the present invention, "crystalline glass"
Is a glass having the property of precipitating crystals by heat treatment, that is, glass as a precursor of crystallized glass, and `` crystallized glass '' is obtained by heat-treating crystalline glass, and has already been obtained. Refers to glass on which crystals are deposited.

In the present invention, the term "particle diameter" refers to the maximum diameter of a cullet composed of crystalline glass particles and amorphous glass.

The present invention relates to a decorative glass obtained by mixing a crystalline glass particle and a cullet composed of an amorphous glass, sintering, and then gradually cooling the crystallized glass particle. Natural stone pattern decoration, wherein the particle size of the cullet made of glass is 5600 μm or less, and the weight ratio of the crystalline glass particles to the cullet (cullet / crystalline glass particles) is 1.5 or more and 4 or less. It is glass.

Further, the present invention provides a method for producing a crystalline glass, comprising:
00 μm to 2000 μm, 2000 μm to 1180 μ
m, the mixing ratio at a particle size of less than 1180 μm
The natural stone-patterned decorative glass described above, characterized in that the cullet has a particle size of 5600 μm to 2000 μm and less than 1180 μm.

Further, the present invention provides a method for producing a crystalline glass
O-SiO ₂ -Al ₂ O ₃ based compositions, and / or Na ₂ O-
A decorative glass of the natural stone pattern, characterized in that the CaO-SiO ₂ -Al ₂ O ₃ based glass particles of the crystalline glass with a composition.

Further, the present invention is the decorative glass having a natural stone pattern as described above, wherein the cullet is a cullet obtained by pulverizing a colored glass made of amorphous glass.

Further, the present invention is the decorative glass having a natural stone pattern as described above, wherein a coloring agent is added in an amount of 3% by weight or less based on the total weight of the crystalline glass grains and the cullet. .

Further, the present invention is characterized in that the crystallizable glass particles are mixed with a cullet composed of amorphous glass, the crystallized glass particles are crystallized by heating, and then gradually cooled. This is a method for producing a decorative glass pattern.

Further, the present invention is the above-mentioned method for producing a natural stone-patterned decorative glass, wherein the heating temperature for crystallizing the crystalline glass particles is 900 ° C. or more and 1000 ° C. or less.

In the decorative glass of the present invention, the weight ratio when the cullet composed of amorphous glass and the crystalline glass particles are mixed is a value obtained by dividing the total weight of the cullet by the total weight of the crystalline glass particles. That is, the ratio is 1.5 or more and 4 or less in the cullet / crystalline glass particles. When the weight ratio is more than 4, the sinterability of the obtained sintered glass is improved and the strength is increased by increasing the number of cullets of the amorphous glass, but the crystallized glass formed by crystallizing the crystalline glass particles is generated. The area of the white portion is too small, the surface pattern becomes uniform, and it is difficult to say a natural stone pattern such as granite or marble, and a decorative glass having a natural stone pattern cannot be obtained. On the other hand, if the weight ratio is less than 1.5, the sinterability of the obtained sintered glass deteriorates, and the strength as a building material cannot be obtained. The preferred weight ratio is 2 or more and 3 or less, and a decorative glass having a natural stone pattern and having robustness and strength enough to withstand use as a wall material and an interior material of a building can be obtained.

On the other hand, the crystalline glass particles used as a raw material for the decorative glass of the present invention preferably have a particle size of 5600 μm or less. Crystalline glass particle size of 5600μ
If it is larger than m, the crystallization hardly proceeds to the center of the crystalline glass during heating, and it becomes difficult to obtain a white portion in the obtained sintered glass. Therefore, the particle size of the crystalline glass particles needs to be 5600 μm or less. There is.

Further, the crystalline glass particles used as a raw material in the decorative glass of the present invention give a white portion when formed into a sintered body, and enhance the sinterability of the sintered body and improve the strength. Therefore, in order to improve the contrast with the portion made of cullet made of amorphous glass, it is possible to mix and use coarse particles, medium particles, and small particles according to the particle size of crystalline glass particles with a vibrating sieve or the like. preferable. Although the particle size of the three types of particles is not strictly limited, for example, the particle size of
600 μm to 2000 μm, and the average particle size
μm to 1180 μm, the particle size of the small particles is less than 1180 μm, and roughly coarse particles: medium particles: small particles = 1: 1: 1, 2: 1:
A weight ratio, such as 1,3: 1: 1 or 3: 2: 1
Various natural stone patterns can be obtained by mixing coarse grains: medium grains: small grains in the range of 1-3: 1-2: 1-2.

On the other hand, the cullet composed of amorphous glass used as a raw material for the decorative glass of the present invention has a particle size of 5600.
It is preferably not more than μm. Cullet particle size 56
If it is not less than 00 μm, the area of the transparent portion of the obtained sintered body made of cullet other than white is too large, and it is difficult to obtain a natural stone pattern.

The cullet made of amorphous glass used as a raw material for the decorative glass of the present invention has a particle size of 560.
It is preferable to use two types, that is, coarse particles of 0 μm to 2000 μm and small particles of less than 1180 μm, which are classified by a vibration sieve or the like. A cullet having a particle size of 5600 μm to 2000 μm, that is, a coarse cullet forms a transparent part of a natural stone pattern when used as the decorative glass of the present invention.
Cullets having a particle size of less than 1180 μm, that is, small cullets, form opaque to translucent portions.
Cullets having a particle size of less than 2000 μm are devitrified during heat treatment.
Due to the devitrification of the cullet of less than 0 μm, the contrast between the transparent part and the opaque part on the surface of the sintered body becomes unclear,
Since a desired natural stone pattern cannot be obtained, it is preferable that cullet having a size of 1180 μm or more and less than 2000 μm is not used as a raw material of the decorative glass of the present invention.

If the composition of the crystalline glass particles used as the raw material of the decorative glass of the present invention is selected to be close to the composition of the soda lime silicate glass as the cullet, a dense and strong sintered body can be obtained. CaO-S by heating
CaO—SiO ₂ —Al ₂ O ₃ that precipitates an iO ₂ -based crystal phase
Crystalline glass of system composition or Na ₂ O—CaO—Si
Na ₂ O—CaO—SiO ₂ — that precipitates an O ₂ -based crystal phase
It is preferable to use crystalline glass having an Al ₂ O ₃ composition.

As is common to the cullet composed of crystalline glass grains and amorphous glass, when sintering is performed using only coarse grains or medium grains, gaps are generated in the obtained sintered body, Since the strength is low and brittle, it is necessary to fill small gaps by adding small grains in order to increase the strength of the sintered body.

Further, in the method for producing decorative glass of the present invention, by using at least two or more kinds of colored glass cullets having different color tones and crystalline glass particles for depositing white crystals, various natural stone pattern decorations can be obtained. As you can obtain glass, cullet made by crushing colored glass,
That is, it is preferable to use colored glass cullet.

A coloring agent may be added to the crystalline glass itself or a mixture of the crystalline glass particles and the glass cullet. In this case, the amount of the coloring agent to be added is 3% by weight or less based on the total weight of the crystalline glass particles and the cullet made of amorphous glass.

If a coloring agent mainly composed of a metal oxide is added in an amount of more than 3% by weight, the sintered state of the sintered body is deteriorated and the strength is reduced. Further, the color tone becomes too dark and the natural stone pattern becomes unnatural. .

In the method for producing decorative glass of the present invention,
By heating the crystalline glass to a temperature higher than the crystallization temperature at which the crystalline glass is crystallized to become crystallized glass, decorative glass is obtained.
In order to crystallize the crystalline glass and firmly sinter the crystallized glass particles and the amorphous glass, 900 ° C.
It is necessary to heat more. In addition, if rapid cooling is performed after the heat treatment, cracks are generated on the surface of the generated sintered body, and in a remarkable case, the sintered body is broken. Therefore, it is necessary to gradually cool after the heat treatment.

Further, it is not necessary to heat to a high temperature of 1000 ° C. or more as in the case of crystallizing and sintering crystalline glasses, and a preferable heating temperature range is 900 ° C. or more.
1000 ° C. or less. Although it depends on the type of the crystalline glass used, in the case of 950 ° C., it is preferable that after heating to 950 ° C., the temperature is kept at approximately 950 ° C. for 1 hour or more.

[0034]

Next, the raw material of the decorative glass of the present invention and the production method will be described.

The method for producing a decorative glass of the present invention is described, for example, in FIG.
As shown in FIG. 2, after the crystalline glass particles 3 and the cullet 4 of the amorphous glass are adjusted to the above-described particle size and particle size distribution, they are mixed in the above-described weight ratio, and after being developed in the mold 5, The glass is heated to a temperature higher than the crystallization temperature of the crystalline glass and sintered to obtain a decorative glass having a natural stone pattern.

The type of the crystalline glass particles 3 is not particularly limited as long as it can be fused and crystallized at a temperature of 900 ° C. or more. For example, a cullet 4 made of soda lime silicate glass is used. If, when selecting the crystallized glass having a composition close to soda lime silicate glass, it is possible to obtain a dense and strong sintered body, by heating the precipitated CaO-SiO ₂ based crystal phase CaO-S
Crystalline glass particles 3 of iO ₂ —Al ₂ O ₃ composition or N
Na ₂ O that precipitates a ₂ O—CaO—SiO ₂ system crystal phase
It is preferable to use crystalline glass particles 3 having a —CaO—SiO ₂ —Al ₂ O ₃ composition.

By using the crystalline glass particles 3, it is possible to fuse with the cullet 4 made of the amorphous glass at a lower temperature than using the crystallized glass that has already been crystallized. The crystalline glass particles 3 can be obtained in a crushed state by blending a crystalline glass composition, heating and melting, and then immersing in water at a high temperature and quenching it. And it is easy to adjust to a desired particle size by further pulverizing if necessary.

The type of cullet 4 made of amorphous glass is not particularly limited, and any cullet 4 obtained by pulverizing amorphous glass having a softening point lower than the heating temperature may be used. It is preferable to use soda lime silicate glass because the cullet 4 obtained by pulverizing the soda lime silicate glass obtained is easily available and inexpensive.

The form of the amorphous glass which is crushed into cullet 4 is not limited.
However, since there are few flat shapes, it is preferable. When an irregular shape such as a glass bottle is crushed, a flat shape is mixed, and as a result, a natural stone pattern with a clear contrast cannot be obtained. The plate glass to be ground may be tempered glass that has been tempered by heating or cooling or the like to make it difficult to break, or may be untempered glass that has not been tempered at all. Since it contains almost no flat cullet, it is a more suitable raw material for the decorative glass of the present invention.

The color of the cullet 4 may be colorless and transparent, that is, it may be clear. However, a coloring agent must be added to obtain a natural stone pattern. Cullet 4 is preferred,
For example, blue, green, used for protecting the privacy of automobile side glass, rear glass, etc.
A cullet 4 obtained by pulverizing a thick colored transparent plate glass colored bronze or gray is suitable. By pulverizing the colored transparent glass sheet obtained as an end plate in a window glass manufacturing process of an automobile, a supply of a colored transparent glass cullet 4 having a uniform color tone is expected.

Colored transparent glass cullet 4 of several colors
In the present invention, a decorative glass having a more natural stone pattern can be produced by using the same.

Further, in the decorative glass of the present invention, a coloring agent may be added in order to obtain a decorative glass closer to a natural stone pattern.

The kind of the coloring agent to be added is as follows.
Cobalt oxide that absorbs light of 0 nm to 650 nm and colors the glass blue, that is, CoO, glass
Manganese dioxide to color pink, ie MnO ₂ ,
Wavelength 400 nm to 650 nm with wavelength 450 nm as peak
Nickel oxide that absorbs light and colors the glass brown, i.e., NiO, titanium oxide that absorbs light having a wavelength of from 400 nm to short wavelength, imparts an ultraviolet cut function to the glass, and colors the glass yellow, that is, TiO ₂ Vengara that colors the glass blue-green, that is, Fe ₂ O ₃ , wavelength 45
Chromium oxide that absorbs light around 0 nm and around 650 nm to color the glass green, and cerium oxide,
CeO _{2 and the} like.

In the method for producing decorative glass of the present invention,
Crystalline glass particles 3, cullet 4 made of amorphous glass
Is placed in, for example, a mold 5 coated with alumina or the like as a release material, for example, a heat-resistant steel dish, a ceramic dish, or the like, and crystallized glass particles are crystallized by heating to obtain crystallized glass. , Get decorative glass. Preferably, 90
It is heated to a temperature of 0 ° C. or more and 1000 ° C. or less to crystallize to obtain a decorative glass. The decorative glass thus obtained has smooth irregularities on the surface, is smooth, and the polishing process for obtaining a natural stone pattern on the surface is facilitated.

FIG. 1 shows a plan view of an example of the decorative glass thus obtained.

Examples of the present invention will be described below, but the present invention is not limited to the following examples.

[0047]

EXAMPLES (crystallizable glass particles 3 and preparation of cullet 4) crystallizable glass particles 3 CaO-SiO ₂ -Al ₂ O ₃ system or _{Na 2 O-CaO-SiO 2} -Al 2 O 3 based crystalline glass Was used. That is, CaO, SiO ₂ , Al ₂ O ₃ , and Na ₂ O, which are the compositions of the crystalline glass, are expressed as CaO: SiO ₂ : Al ₂ O ₃ = 42: 5 in a weight ratio in terms of weight%.
5: 3 or CaO: SiO ₂ : Al ₂ O ₃ = 45: 5
0: 5, or Na ₂ O: CaO: SiO ₂ : Al ₂ O ₃
= 20: 15: 60: 5, then melted by heating to 1400 ° C to 1500 ° C, immersed in water, crushed, and further crushed to a particle size of 5600 µm to
2000 μm, 2000-1180 μm μm, 1180
The particles were classified into three types having a particle size of less than μm.

On the other hand, a colored plate glass made of soda lime silicate glass having a color tone of gray, bronze, green, blue or the like by a float method is washed with water, crushed to obtain a glass cullet 4, and has a particle size of 5600 μm to 2000 μm.
μm and two kinds of particle sizes of less than 1180 μm. Example 1 Crystalline glass particles 3, 30 wt% (composition, CaO: SiO ₂ : Al ₂ O ₃ = 42: 55: 3, particle size, 5600 μm to 2000 μm, 10 wt%, 200 wt%)
0 μm to 1180 μm, 10 wt%, less than 1180 μm, 10 wt%) and cullet 4, 70 wt% (grain size, 56
00 μm to 2000 μm, 30 wt%, less than 1180 μm, 40 wt%), and coated with alumina powder as a mold release material so as to have a thickness of 15 mm.
After sintering at 975 ° C. for 2 hours, the resultant was gradually cooled to obtain a sintered body.

In the obtained sintered body, the crystallized glass particles, in which the crystalline glass particles 3 were crystallized and turned white, and the cullet were softened and fused while leaving the shape of the particles. As shown in FIG. 1 which is a front view of an example, a white portion 1 made of crystallized glass is replaced with a colored portion 2 made of cullet.
It emerged in the interior, and was satisfactory as a decorative glass with granite-like natural stone pattern.

After heating the obtained sintered body to 560 ° C.,
When bending was performed under a load, bending was possible. Example 2 ₃ , 25 wt% of crystalline glass particles prepared by the above method (composition, CaO: SiO ₂ : Al ₂ O ₃ = 40: 55: 5, particle size, 5600 μm to 2000 μm, 10 wt%, 200
0 μm to 1180 μm, 10 wt%, less than 1180 μm, 5 wt%) and cullet 4, 75 wt% (grain size, 560) obtained by pulverizing flat glass of gray and bronze colors.
0 μm to 2000 μm, 35 wt%, less than 1180 μm, 40 wt%), and coated with alumina powder as a release material so as to have a thickness of 15 mm.
Was placed in a ceramic dish 5 and sintered at 1000 ° C. for 2 hours, and then gradually cooled to obtain a sintered body.

In the same manner as in Example 1, the obtained sintered body was softened and fused with the crystallized glass particles, in which the crystalline glass particles 3 were crystallized and turned white, and the cullet 4, leaving the shape of the particles. Yes,
As shown in FIG. 1 which is a front view of an example of the decorative glass of the present invention, a white portion 1 made of crystallized glass emerges in a colored portion 2 made of cullet 4 and has a granite-like natural stone pattern. It was satisfactory enough as decorative glass. After heating the obtained sintered body to 560 ° C. and bending it under a load, bending was possible. Example 3 3, 35 wt% of crystalline glass particles produced by the above method (composition, Na ₂ O: CaO: SiO ₂ : Al ₂ O ₃ = 20: 1)
5: 60: 5, particle size, 5600 μm to 2000 μm, 1
5 wt%, 2000 μm to 1180 μm, 10 wt%,
Cullet 4, which is obtained by pulverizing plate glass of gray, green and blue tones, less than 1180 μm, 10 wt%)
65 wt% (particle size, 5600 μm to 2000 μm, 35
wt%, less than 1180 μm, 30 wt%)
It was placed in a ceramic dish 5 having an outer diameter of 150 mm and coated with alumina powder as a release material so as to have a plate thickness of 15 mm, sintered at 950 ° C. for 2 hours, and then gradually cooled to obtain a sintered body. .

In the same manner as in Example 1 or Example 2, the obtained sintered body was softened while the crystallized glass particles 3 and the cullet 4 were turned white due to crystallization of the crystalline glass particles. As shown in FIG. 1 which is a front view of an example of the decorative glass of the present invention, a white portion 1 made of crystallized glass emerges in a colored portion 2 made of cullet and has a granite tone. It had a natural stone pattern and was satisfactory as decorative glass. After heating the obtained sintered body to 560 ° C. and bending it under a load, bending was possible. Example 4 ₃ , 29 wt% of crystalline glass particles produced by the above method (composition, CaO: SiO ₂ : Al ₂ O ₃ = 40: 55: 5, particle size, 5600 μm to 2000 μm, 11 wt%, 200
0 μm to 1180 μm, 9 wt%, less than 1180 μm,
9 wt%) and cullet 4, 70 wt% (grain size, 5600 μm to 2
000μm, 30wt%, less than 1180μm, 40wt
%) And 1 wt% of nickel oxide as a colorant, and put into a ceramic dish 5 having an outer diameter of 150 mm and coated with alumina powder as a release material so as to have a thickness of 15 mm. After sintering for 2 hours, the resultant was gradually cooled to obtain a sintered body. In the obtained sintered body, similarly to Example 1 or Example 3, the crystallized glass particles 3 and the cullet 4 are softened and fused while leaving the shape of the particles, and are one example of the decorative glass of the present invention. As shown in FIG. 1 which is a front view, a white portion 1 made of crystallized glass emerges in a colored portion 2 made of cullet, and has a natural stone pattern of a granite color with a pale green color as a whole. It was satisfactory enough as decorative glass. After heating the obtained sintered body to 560 ° C,
When bending was performed under a load, bending was possible. Comparative Example 1 Crystalline glass particles produced by the above method 3, 10 wt% (composition, CaO: SiO ₂ : Al ₂ O ₃ = 42: 55: 3, particle size, 5600 μm to 2000 μm, 4 wt%, 2000
μm to 1180 μm, 3 wt%, less than 1180 μm, 3
wt.) and crushed crushed plate glass of gray and bronze colors 4, 90 wt.
２０００2000 μm, 50 wt%, less than 1180 μm, 40
wt%), and placed in a ceramic dish 5 having an outer diameter of 150 mm coated with alumina powder as a mold release material so as to have a plate thickness of 15 mm, sintered at 975 ° C. for 2 hours, and then gradually cooled. After cooling, a sintered body was obtained.

The obtained sintered body had few white portions 1 made of crystallized glass, and a granite-like natural stone pattern could not be obtained. Comparative Example 2 Crystalline glass particles 3, 50 wt% (composition, CaO: SiO ₂ : Al ₂ O ₃ = 42: 55: 3, particle size, 5600 μm to 2000 μm, 30 wt%, 200)
0 to 1180 μm, 10 wt%, less than 1180 μm, 10 wt%) and cullet 4, 50 wt% (grain size, 56
00 μm to 2000 μm, 30 wt%, less than 1180 μm, 20 wt%), and coated with alumina powder as a mold release material so as to have a thickness of 15 mm.
After sintering at 975 ° C. for 2 hours, the resultant was gradually cooled to obtain a sintered body.

Since the obtained sintered body has many white portions 1 made of crystallized glass, it becomes inconspicuous among the colored portions 2 made of glass cullet, and the decorative property of a granite-like natural stone pattern cannot be obtained. In addition, the glass cullet, which also functions as a binder, has a small number of melting portions, so that sinterability is poor, and sufficient strength as a building material cannot be obtained.

[0055]

According to the present invention, the crystal grains and the cullet made of amorphous glass are used to adjust the particle size and the mixing ratio, and after sintering at a temperature of 900 ° C. or more and 1000 ° C. or less, slowly cooling. According to the decorative glass manufacturing method of the present invention, it is possible to provide a dense and strong granite-like natural stone pattern decorative glass equivalent to a decorative glass using only crystallized glass as a raw material.

Further, the method for producing a decorative glass according to the present invention comprises:
Since a cullet made of amorphous glass such as soda lime silicate glass is used as a raw material, it is possible to obtain a decorative panel with a small shrinkage at the time of sintering and a high dimensional accuracy. Unlike decorative glass using only crystallized glass as a raw material, it can be bent at a temperature near the softening point of soda lime silicate glass, and can produce curved panels and the like.

[Brief description of the drawings]

FIG. 1 is a front view of an example of the decorative glass of the present invention.

FIG. 2 is an explanatory view of a method for producing a decorative glass of the present invention.

[Explanation of symbols]

 1 White part composed of crystallized glass particles 2 Part composed of cullet 3 Crystalline glass particles 4 Cullet 5 Formwork (ceramic dish)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Machishita 1510 Oguchicho, Matsusaka City, Mie Prefecture Central Glass Co., Ltd. Glass Research Laboratory F-term (reference) 4G015 EA02

Claims (7)

[Claims] 1. A decorative glass obtained by mixing crystalline glass particles and a cullet made of amorphous glass, sintering, and then gradually cooling the mixed glass particles. A natural stone-patterned decorative glass, characterized in that the cullet has a particle size of 5600 μm or less and a weight ratio of crystalline glass to the cullet (cullet / crystalline glass particle) is 1.5 or more and 4 or less. 2. The crystalline glass particles have a particle size of 5600 μm to 200 μm.
The mixing ratio at a particle size of 0 μm, 2000 μm to 1180 μm, and a particle size of less than 1180 μm is 1-3: 1 to 2: 1 to 1 by weight.
2, and the particle size of the cullet is 5600 μm to 20 μm.
The decorative glass with a natural stone pattern according to claim 1, wherein the thickness is less than 00 µm and 1180 µm. 3. The method according to claim 1, wherein the crystalline glass particles are CaO-SiO ₂ -A
l ₂ O ₃ composition and / or Na ₂ O—CaO—SiO ₂
-Al ₂ O ₃ based decorative glass natural stone pattern according to claim 1 or claim 2, characterized in that the glass particles of the crystalline glass with a composition. 4. The natural stone-patterned decorative glass according to claim 1, wherein the cullet is a cullet obtained by pulverizing colored glass made of amorphous glass. 5. A colorant according to claim 1, wherein a colorant is added in a range of 3% by weight or less based on the total weight of the crystalline glass particles and the cullet. Decorative glass with natural stone pattern. 6. A method according to claim 1, wherein the crystallized glass particles are mixed with a cullet made of amorphous glass, and the crystallized glass particles are crystallized by heating and then gradually cooled. The method for producing a decorative stone-patterned glass according to any one of the above. 7. The process for producing a natural stone-patterned decorative glass according to claim 6, wherein the heating temperature for crystallizing the crystalline glass particles is 900 ° C. or more and 1000 ° C. or less.