JP2501211B2 - Glass body manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a glass body using powdered glass, and particularly to a glass body suitable for producing a glass body at a low number of steps and at low cost. Manufacturing method.

[Conventional technology]

There is known a method of producing a glass plate used for a wall covering material of a building using glass powder. (For example, JP-A-60-226417) The method for producing the above glass body is, for example, a method in which glass powder is pressure-molded in the presence of a liquid while applying vibration, and then firing is performed.

[Problems to be solved by the invention]

According to the above-mentioned conventional method for producing a glass body, although it has an advantage that a glass body having a good design property such as a natural stone pattern and an artificial marble can be produced at a relatively low cost by using a raw material such as scrap glass, vibration and the like during molding There has been a problem that a large-scale device is required for addition and polishing or the like must be performed when the surface of the glass body needs gloss.

It is an object of the present invention to provide a method for inexpensively and easily producing a high-quality glass body that does not require a large-scale device or the like, has good gloss and gloss even without polishing, and has few defects such as bubbles. .

[Means for solving problems]

In order to solve the above problems, the present invention uses a glass powder containing 45 wt% or more of particles having a particle size of 10 μm to 100 μm as the glass powder in a method for manufacturing a glass body in which the glass powder is molded and then fired. The water content of the glass powder during molding or before firing is kept at 5% or less.

In the present invention, powdered glass is the main raw material, but the glass body that is the raw material of this powdered glass may be any ordinary glass body such as plate glass scraps and pin glass scraps. However, in particular, in order to obtain a monochromatic plain glass body, it is preferable not to contain impurities such as metals, inorganic substances and organic substances. Further, for the purpose of coloring and patterning, glass containing impurities or pigments as described above can be used.

The glass powder used in the present invention needs to contain particles of 10 μm to 100 μm in an amount of 45% by weight or more, but the effects of the present invention cannot be obtained unless the particles contain 45% by weight or more of the particles. For example, 10 μm
Glass powder containing more than 55% by weight of smaller particles,
When molded, the loose bulk specific gravity tends to be less than 0.85 g / cm ³ , and the voids between the particles cause foaming during firing and the surface of the glass body is easily damaged. Conversely, for example, the particle size is 100
A glass powder containing more than 55% by weight of particles larger than μm also tends to deteriorate the quality of the glass body due to an increase in voids between the particles or an increase in voids.

On the other hand, powdered glass containing 45% by weight or more of particles with a particle size of 10 μm to 100 μm has a loose bulk specific gravity of 0.85 g / cm ³ or more and has few voids, requiring special molding methods such as pressure molding, vibration molding, and equipment. Without heat treatment, a glass body having a glossy and glossy decorative surface without bubbles can be produced by heat treatment at a temperature of 800 ° C to 1100 ° C.

Further, the raw material glass powder at the time of molding or before firing must have a water content of 5% or less. Even if the powdered glass of the above particle size contains more than 5% of water, the water is hydrated on the surface of the activated glass particles, so that heat treatment (firing temperature 800 ° C to 1100 ° C) Foam. Further, glass particles having a particle diameter of 30 μm or less easily move with water during molding and heating to easily form a fine powder layer on the upper surface of the molded body. Since this fine powder has a large dirty surface and easily foams, it becomes a fine powder layer foamed after heat treatment,
In order to cover the original glossy and glossy surface and obtain a glossy and glossy surface, the foamed fine powder layer must be ground and further polished as in the conventional case. However, when the water content is 5% or less, the movement and foaming of the glass particles having a particle size of 30 μm or less are not recognized, and even without polishing, a heat-treated foam-free glossy and glossy decorative surface can be obtained. Is possible.

Therefore, the water content of the raw powder glass should be kept at 5% or less until the molding or firing. However, before crushing to obtain powdered glass having the above-mentioned particle size, 5% of the large glass particles or glass lumps are
Having the above water content does not hinder the purpose of the present invention.

The method for producing a glass body of the present invention uses glass powder as a main raw material, but it may be carried out by mixing a small amount of silica sand, alumina, clay, a coloring agent and the like into the glass powder. On the contrary, in order to improve the designability, it is preferable to add an appropriate amount of the above additives according to the purpose.

The raw material powder is preferably heat-treated at a temperature of 800 ° C to 1100 ° C. When the heat treatment is lower than 800 ° C, it is difficult to obtain a smooth, glossy, glossy decorative surface in which a part of the glass particles are melted, and at a temperature higher than 1100 ° C, the fusion of the glass particles with each other results in the entire advancing plate. It tends to be bluish and translucent, making it difficult to obtain an opaque and solid texture similar to stone. Since the viscosity also decreases, microscopic bubbles of 0.1 mm or less, which are inconspicuous to the naked eye, tend to aggregate to form bubbles of 0.3 mm or more.

The firing temperature is in the range of 800 ° C to 1100 ° C, and the optimum treatment temperature can be considered depending on the conditions such as the particle size distribution of the raw material glass and the proportion of the admixture. This is experimentally obtained from the conditions such as smooth gloss and visible light transmittance, and by treating at this optimum temperature, a glass body having the most gloss, gloss and opacity can be obtained.

Further, the glass body manufactured according to the present invention may have any shape, and it is the easiest to produce a glass wall as a wall material for building because it is the easiest to produce.

Further, the glass powder can be molded by filling it in a mold or the like, but it can also be molded by, for example, a method of spraying the glass powder on a plate-shaped substrate. Further, pressing the glass powder at the time of molding is effective in reducing the voids in the glass body, and the present invention does not prevent the simultaneous use of molding by a pressing operation such as temporary pressing by input.

In the present invention, particles having a particle size of 10 μm to 100 μm are used.
Although the content of the particles is not less than 100% by weight, the particles may be 100% by weight, and it is preferable that all the particles have a particle size of 10 to 100 μm because a glass body having uniform properties can be easily obtained.

〔Example〕

Particle size distribution is 840 μm to 100 μm by weight%, 23%, 100 μ
m to 10 μm 59%, 10 μm or less 18% and a glass content of 0.05% (SiO ₂ 71.2, Al ₂ O ₃ 1.4, CaO 9, MgO 3.9, Na ₂ O 13.
5, K ₂ O 1, each weight%) and powdered alumina having a central particle diameter of 60 μm in 95: 5 (weight ratio), respectively.
Weighed and mixed well. Using this mixture as a raw material, it was spread on a flat shelf plate to a thickness of 16 mm, heated to 1000 ° C. in an electric furnace, held for 2 hours, and then gradually cooled to obtain a glass plate. .

The glass particles in the glass plate are not sintered or partially fused, but the interface is almost left,
Light was scattered at the grain interface, resulting in a white plate that was opaque and had a profound feeling. The glass plate surface that was on the upper side at the time of firing,
Since some of the glass particles were melted, it had a smooth, glossy, glossy appearance with irregularities of 0.2 mm or less. Furthermore, there were no bubbles with a diameter of 0.3 mm or more in the glass plate.

[Comparative example]

Comparative Example-1 A powdered glass having a water content of 10% by weight and the same composition and particle size distribution as those of the above-mentioned Examples was mixed with alumina in the same manner and heat-treated to prepare a glass plate. It
A foamed piece of 0.2-1 mm is formed, the surface of which is 0.2-0.5
There was unevenness of mm, and there was no gloss or gloss.

Comparative Example-2 In addition, the same composition as in the above Example was used, and the particle size distribution was 84% by weight.
0μm ~ 100μm 1%, 100μm ~ 10μm 40%, 10μm or less 59%
Then, powdered glass having a water content of 0.1% by weight was mixed with alumina in the same manner as in the above example, and then heat treated at 1050 ° C. This is a glass plate with a lot of bubbles of 0.3 mm or more in 20 to 40 per 100 cm ² although the surface is glossy and glossy because it uses powdered glass with particles of 10 μm to 100 μm less than 45%. And the appearance was significantly impaired.

〔The invention's effect〕

According to the present invention, it is possible to produce a glass body having few bubbles and surface defects at a relatively low firing temperature of 800 to 1100 ° C. without using a vibrating device, a pressing device, or the like, which is clear from the examples.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tamaki Horisaka 4-8 Doshomachi, Higashi-ku, Osaka City Nippon Sheet Glass Co., Ltd. (72) Noriyasu Akaishi 4-8 Doshocho, Higashi-ku, Osaka City Nippon Sheet Glass Co. In the company

Claims (1)

(57) [Claims] 1. A method for producing a glass body, comprising molding glass powder and then firing the glass powder, wherein the glass powder has a particle size of 10 μm.
A method for producing a glass body, which comprises using a glass powder containing 45% by weight or more of particles of 100 μm or more and keeping the glass powder at the time of molding or before firing at a water content of 5% or less.