JP2001199739A - Glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an ultraviolet/infrared/X-ray screening glass having no restriction related to surface shape, high transparency and no discoloration, causing neither reduction in function by surface damage and change with time nor deterioration of transparency, having excellent durability. SOLUTION: A glass raw material powdery or granular material is mixed with 0.1-25 wt.% of powder of transparent electroconductive metal oxide, heated, melted and cooled to give glass having ultraviolet/infrared/X-ray screening function and electric conductivity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an ultraviolet ray, an infrared ray,
The present invention relates to glass having a shielding function for X-rays and the like.

[0002]

2. Description of the Related Art In recent years, there has been a growing demand for energy saving in cooling equipment, and the effects of ultraviolet rays and infrared rays contained in sunlight on the human body have been widely known. lens,
Ultraviolet / infrared shielding glass is used for window glass of office buildings.

[0003] These ultraviolet / infrared shielding glasses utilize a sheet having a function of shielding ultraviolet / infrared rays on a surface of a normal sheet glass or the like, a thin-film coated one, or an optical refractive index difference. And the like having a multi-layer structure.

[0004] Further, glass is obtained by adding ferric oxide containing ferrous oxide as an ultraviolet / infrared shielding agent, and in the presence of a metal powder such as silicon, zinc, aluminum or antimony as a reducing agent. In some cases, ferric oxide is added, and a part of the reduced ferrous oxide is present in the glass.

When sunlight passes through such an ultraviolet / infrared shielding glass, a harmful ultraviolet component (wavelength 190 to 190) is used.
400 nm) and infrared component (800-2500 n)
m) is attenuated, so that the adverse effects of ultraviolet rays and infrared rays can be reduced.

[0006]

Problems to be Solved by the Invention Ultraviolet rays
Conventional ultraviolet / infrared shielding glass with a film that blocks infrared rays or coated with a thin film is less transparent than glass alone, and when a hard object comes into contact with the glass surface or is strongly rubbed, The film or the thin film may be damaged, and the shielding function may be deteriorated or lost.

Further, when used for a long period of time, the film and the thin film are deteriorated by sunlight, and the shielding function is gradually reduced, so that the durability is insufficient. Such ultraviolet / infrared shielding glass is manufactured by attaching a film on the glass surface or coating a thin film on the glass surface.
Difficult to apply.

[0008] The ultraviolet / infrared shielding glass having a multi-layer structure utilizing an optical refractive index difference requires a high level of technical skill and large-scale equipment for manufacturing, and is expensive, so that it is adopted for general glass. Is difficult.

On the other hand, an ultraviolet / infrared shielding glass containing ferrous oxide and / or ferric oxide as an ultraviolet / infrared shielding agent is colored by iron contained in the ultraviolet / infrared shielding agent, and has a low transparency. However, there is a problem that the application is limited due to coloring.

The problem to be solved by the present invention is that there is no restriction on the surface shape, the transparency is high, there is no coloring, the function is not deteriorated due to surface damage or aging, and the transparency is not deteriorated, and the durability is excellent. It is to obtain an ultraviolet / infrared shielding glass, and further to obtain a glass having an X-ray shielding function and conductivity.

[0011]

The glass of the present invention is characterized in that a transparent conductive metal oxide is contained as a constituent of the glass. By including a transparent conductive metal oxide as a component of glass, ultraviolet rays (wavelength
0-400 nm), infrared rays (800-2500 nm) as well as X-rays (wavelength 0.6-230 °) can be effectively shielded, and conductivity is also exhibited. Here, as the transparent conductive metal oxide, any one of conductive zinc oxide, conductive tin oxide, and tin oxide-doped indium can be used. Conventionally, these transparent conductive metal oxides are substances that have been coated on the glass surface for shielding against ultraviolet rays and infrared rays. By including these substances in glass constituents, not only ultraviolet rays and infrared rays but also X The line shielding function is also exhibited, and the glass itself exhibits conductivity.

Since the glass of the present invention is formed by including a transparent conductive metal oxide in the glass itself, there is no restriction on the surface shape, no decrease in transparency or coloring occurs, and a decrease in function due to surface damage and It does not change over time and has excellent durability. Therefore, it can be applied not only to the field of use of conventional infrared / ultraviolet shielding glass, but also to glass of special shape such as glass fiber and medical equipment, precision equipment, and glass used in harsh environments such as dangerous places. can do. In addition, because it has an X-ray shielding function, it can be used as a window glass for buildings at nuclear facilities, windows for buildings and structures around nuclear facilities, etc. It is also effective in preventing damage. Further, since it has conductivity, it has an effect of preventing static electricity.

[0013] constituents of the glass of the present invention, SiO ₂ is 65% ~80%, Na ₂ O is 10% ~20%, CaO is 5% ~15%, MgO is 0% _{~10%, K} 2 O Is 0% ~
5%, Al ₂ O ₃ is 0% to 5% as a basic component, and in addition, oxygen, silicon, sodium, calcium, boron,
Lithium, sulfur, antimony, aluminum, potassium, titanium, barium, zirconium, zinc, lead, arsenic, magnesium, strontium, cerium, selenium, iron, cobalt, nickel, manganese, molybdenum,
It may contain chromium or the like.

[0014] The content of the transparent conductive metal oxide with respect to the above components is in the range of 0.1 to 25% by weight, preferably 0.5% to 10% by weight. If the content of the transparent conductive metal oxide exceeds 25% by weight, the degree of freedom of the content ratio of the glass constituents is reduced, so that the disadvantage of losing the inherent characteristics of glass occurs, and the content of the transparent conductive metal oxide is contained. If the amount is less than 0.1% by weight, the ultraviolet / infrared / X-ray shielding function and conductivity are not sufficiently exhibited.

As described above, any one of conductive zinc oxide, conductive tin oxide, and tin oxide-doped indium can be used as the transparent conductive metal oxide. In particular, conductive zinc oxide is contained. Glass has an excellent X-ray shielding function as compared with glass containing conductive tin oxide or tin oxide-doped indium. As the conductive zinc oxide, there is a conductive zinc oxide containing aluminum, titanium, tin, or a composite thereof, and a conductive zinc oxide containing 0.5 to 10% by weight of aluminum is particularly effective for the X-ray shielding function. Are better. As such a conductive zinc oxide, a conductive zinc oxide (trade name 2) manufactured by Hakusuiteku Co., Ltd.
3-K) can be suitably used.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on experimental examples. A powder (average particle size of 0.1 to 0.2) of conductive zinc oxide (trade name: 23-K) manufactured by Hakusui Tech Co., Ltd. was added to the glass raw material powder having the composition shown in Table 1.
5 μm) 3 to 10% by weight, and add
After heating and melting in an electric furnace heated to 1300 ° C. for 4 hours, the mixture was poured onto a stainless steel plate and gradually cooled to room temperature to obtain a glass plate having a thickness of 13 mm. Next, this glass plate was polished to a thickness of 10 mm to obtain a sample (invention product).

[0017]

[Table 1]

Similarly, a sample prepared by heating and melting only the glass raw material particles having the composition shown in Table 1 was used as Comparative Example 1, and zinc oxide was added instead of conductive zinc oxide. The sample produced in this manner was designated as Comparative Product 2.

For each of these samples, ultraviolet light having a wavelength of 190 to 400 nm, visible light having a wavelength of 400 to 800 nm, and a wavelength of 800
Irradiation of up to 2500 nm of infrared light, the intensity of transmitted ultraviolet light, visible light, and infrared light were measured by a measuring device arranged on the surface side of the sample, and the transmittance was calculated from the measurement result, and is shown in FIG. The result was obtained.

As can be seen from FIG. 1, the conductive metal oxide contained in the invention contains zinc oxide.
0 nm). At the same time, it can be seen that it has a function of blocking infrared rays having a wavelength of 800 to 2500 nm.

On the other hand, since the comparative product 1 transmits infrared light, it is understood that the comparative product 1 does not have an infrared shielding function.
The effect of shielding ultraviolet rays is almost the same as that of ordinary glass. Comparative product 2 is inferior to the inventive product in the infrared shielding function, but since it contains zinc oxide, it can be seen that it blocks long-wavelength ultraviolet light having a large light amount among ultraviolet light.

Table 2 shows the results of measuring the electric conduction characteristics (area resistance) of the inventive product, the comparative product 1 and the comparative product 2 together with the transmittances of ultraviolet light, infrared light and visible light.

[0023]

[Table 2]

As can be seen from Table 2, the invention product is an ultraviolet ray,
It effectively blocks infrared light and transmits visible light. The invention is a conductor. On the other hand, the comparative product 1 does not have the infrared ray shielding function, and the ultraviolet ray shielding function is the same as that of ordinary glass. Comparative product 2 is inferior to the invention product in the infrared ray shielding function, but has the same ultraviolet shielding function as the invention product.

[0025]

According to the present invention, a transparent conductive metal oxide such as conductive zinc oxide, conductive tin oxide, or tin oxide-doped indium is contained as a constituent of glass to effectively block ultraviolet rays, infrared rays, and X-rays. In addition, the glass can be made conductive.

Since the glass of the present invention is produced by incorporating a transparent conductive metal oxide into the glass itself, there is no restriction on the surface shape as in the case of the glass according to the conventional method. No deterioration due to surface damage and no change over time occur, and excellent durability. Furthermore, since it has an X-ray shielding function, it can be applied to a wide range of applications. In addition, since it has conductivity, it also has an antistatic effect.

[Brief description of the drawings]

FIG. 1 is a graph showing measurement results of transmittance of ultraviolet light, visible light, and infrared light.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Masatake Takeuchi 1982-1, Futoka, Nogata, Fukuoka Prefecture F-term (reference) 4G062 AA01 BB01 CC04 DA06 DA07 DB02 DC02 DD01 DE02 DE03 DE04 DF02 EA02 EB04 EC01 EC02 EC03 ED01 ED02 ED03 EE02 EE03 EE04 EF02 EG02 FA01 FB02 FC02 FE01 FE02 FE03 FE04 FF01 FG01 FH01 FJ01 FK01 FL02 GA01 GB02 GC02 GD01 GE01 HH01 HH03 HH05 HH06 KKHJ07HH08 KK NN13 NN14

Claims (4)

[Claims] 1. A glass comprising a transparent conductive metal oxide as a constituent of the glass. 2. The glass according to claim 1, wherein the transparent conductive metal oxide is one of conductive zinc oxide, conductive tin oxide, and tin oxide-doped indium. 3. The method according to claim 1, wherein the transparent conductive metal oxide is 0.5 to
The glass according to claim 1, which is a conductive zinc oxide containing 10% by weight of aluminum. 4. The glass material according to claim 1, wherein the content of said transparent conductive metal oxide is 0.1 to 25% by weight of the glass raw material.
The glass according to any one of the above.