JP2001064042A - Low-pressure double layer glass and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide low-pressure double layer glass having high adiabatic performance and a process for producing the same. SOLUTION: The low-pressure double layer glass 1 is formed with a low- pressure space by isolating two sheets of sheet glass apart a prescribed spacing, disposing dotty, wire-shaped or net-like spacers 5 for holding the spacing therebetween and hermetically sealing the peripheral marginal edges of this panel by low m.p. solder glass 8. A discharge aperture 4 disposed to form the low-pressure space is sealed with a cap member 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the field of energy saving in the field of construction such as housing and non-residential, the field of transportation of automobiles, vehicles, ships, aircrafts, etc., and the field of equipment such as freezers, freezer showcases, constant temperature and humidity chambers. The present invention relates to a low-pressure double-glazed glass having high heat insulating performance applied to an exhaust opening requiring a high temperature and a manufacturing method thereof.

[0002]

2. Description of the Related Art In recent years, in order to create a comfortable and healthy living environment with excellent energy saving, double glazing having heat insulation performance has been used more frequently than ever before and has been rapidly spreading.

[0003] As this double-glazed glass, a low-pressure double-glazed glass in which a space formed by opposing plate glasses is reduced in pressure has been proposed.

[0004]

In order to reduce the pressure in the internal space of the double-glazed glass to provide heat insulation, the pressure must be reduced to 10 Pa or less, preferably 1 Pa or less. In order to reduce the pressure to a desired pressure, as in the conventional example shown in FIG.
When exhausting a double-layer glass cell using a hollow glass tube, it takes a long time to reduce the pressure because the exhaust capacity of the exhaust tube is extremely small. In addition, since the glass exhaust pipe is sealed, there is a problem that the sealed portion is easily damaged.

[0005]

SUMMARY OF THE INVENTION According to the present invention, two sheets of glass are spaced at a predetermined interval, and a dot-like, linear or mesh-like spacer for maintaining this interval is provided. A low-pressure double-layer glass in which a low-pressure space is formed by sealing a portion with a low-melting-point solder glass, wherein an exhaust opening provided for the low-pressure space is sealed with a lid member. It is.

The low pressure double glazing is characterized in that the glass surface around the exhaust opening provided in the glass is concave.

Further, the lid member is made of low melting point glass or 42
The low pressure double glazing is characterized by being formed of a 6 alloy.

[0008] Further, there is provided the method for manufacturing a low-pressure double-glazed glass, wherein an exhaust head provided with a heater that moves up and down is used to seal the exhaust opening with a lid member.

Further, the present invention is the method of manufacturing a low-pressure double glazing, wherein the exhaust head is made convex and the glass surface around the exhaust opening is made concave.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is for producing a low-pressure double glazing in which two glass sheets are separated at a predetermined interval. Two sheets of glass are clear float glass,
Heat absorbing glass, Heat reflecting glass, High performance reflecting glass, Low radiating glass, Wire entering glass, Net entering glass, Mold glass, Tempered glass, Double strength glass, Low reflecting glass, High transmitting glass, Ground glass, Tapesti (Frost) ) Various plate glasses such as glass and ceramics printed glass can be appropriately combined. In order to enhance the heat insulation performance, it is preferable that at least one sheet is made of a low radiation plate glass.

Desirably, an antireflection metal oxide layer selected from one or more oxides of zinc, tin, titanium, indium, bismuth and zirconium having a thickness of 10 to 60 nm, and silver having a thickness of 5 to 30 nm Layer and a film containing at least one metal selected from the group consisting of aluminum, titanium, zinc, tantalum and nickel-chromium alloy having a thickness of 0.3 to 30 nm;
An antioxidant layer, a film layer consisting of an antireflective metal oxide layer selected from one or more oxides of zinc, tin, titanium, indium, bismuth, and zirconium oxides having a thickness of 30 to 100 nm was sequentially laminated. Use low radiation glass with excellent heat resistance.

Alternatively, zinc having a thickness of 10 to 60 nm,
An anti-reflective metal oxide layer selected from one or more of oxides of tin, titanium, indium, bismuth, and zirconium, and a film thickness containing a metal selected from one or more of aluminum, titanium, zinc, tantalum, and nickel-chromium alloys Is an antioxidant layer having a thickness of 0.3 to 30 nm and a thickness of 5 to 30 n.
m, a silver layer having a thickness of 0.3 to 30 nm containing at least one metal selected from the group consisting of aluminum, titanium, zinc, tantalum and a nickel-chromium alloy.
Low radiation glass excellent in heat resistance, in which a coating layer composed of an antireflection metal oxide layer selected from one or more oxides of zinc, tin, titanium, indium, bismuth, and zirconium having a thickness of 0 to 100 nm is sequentially laminated. It is preferable to use

The two sheets of glass may be of the same size, of course. However, as different sizes, the small glass is made shorter by 2 to 6 mm on each side than the large glass, so that the low melting point solder glass as a sealing material is used. This is preferable because it facilitates the penetration into the two sheet glasses.

It is preferable that the two glass sheets have edges chamfered by mechanical polishing, laser or the like.

The material for the point material, wire material or mesh material spacer for maintaining the interval between the two sheet glasses is not particularly limited as long as it has a lower hardness than glass and has an appropriate compressive strength. Metals, alloys, steels, ceramics or plastics are preferred. Iron in metal,
Copper, aluminum, tungsten, nickel, chrome,
For alloys such as titanium and steel, carbon steel, chrome steel, nickel steel, stainless steel, nickel chrome steel, manganese steel,
Chrome manganese steel, chromium molybdenum steel, silicon steel, brass, solder, nichrome, duralumin and the like are used.

The point material spacers are arranged in, for example, a lattice shape in a spherical shape, a column shape, a prism shape, or the like.

The wire spacer has a cross section of a circle, a semicircle, a square, or the like, and there are linear and curved shapes. A square spacer, a rhombus, or the like is used as the mesh spacer.

In the case where a metal or alloy is coated with ceramics or plastic, the design can be improved by coloring, and the reflection characteristic of the metal can be suppressed.

The spacing between the dot-like, linear or net-like spacers is 100 mm or less, preferably 75 mm or less.

The arrangement of these spacers may be regular or irregular as long as it is within the range of the arrangement interval.

The distance between the two glass sheets is 0.05 mm or more and 2.0 mm or less, and 0.1 mm or more and 1.0 mm or more.
The following is preferred.

The low melting point solder glass used as a sealing material at the peripheral edge of the panel is a glass powder alone, a glass frit obtained by mixing a glass powder and a ceramic powder, and a paste in which the glass frit is dispersed in a vehicle such as amyl acetate. And those processed as a wire rod such as a glass rod can be used. The composition is described in, for example, JP-A-49-110709 and JP-A-1-224248.
JP-A-8-119665, JP-A-8-119665,
For example, lead silicate glass or lead borosilicate glass described in Japanese Patent No. 20885 and the like, and a low-melting-point sealing material containing a refractory filler or the like therein can be used.

Also, for example, JP-A-6-183775, JP-A-9-175833, JP-A-9-18
Various low-melting-point sealing materials, such as a low-melting-point sealing material in which a refractory filler or the like is contained in a lead-free phosphate glass described in JP-A-8544 or the like, can be used.

The pressure in the sealed low-pressure space between the two glass sheets is 10 Pa or less, preferably 1 Pa or less.

The lid member is preferably made of low-melting glass or a sheet glass made of 426 alloy having a close coefficient of thermal expansion and coated with low-melting glass.

The heater provided on the exhaust head heats the lid member, melts the low melting point solder glass applied to the lid member, and adheres the lid member to the exhaust opening. When the lid member is formed of low-melting glass, the lid member is melted to seal the opening.

A lid member is placed on the heater, the lid member is kept away from the exhaust opening during the exhaust, and after reaching a predetermined pressure, the lid member is pressed against the exhaust opening. An up-down device is provided so that it can be performed.

The up-and-down device is an electric device such as a motor drive or a device that utilizes the pressure of a fluid.

The exhaust head is connected to a vacuum pump for exhausting by a flexible tube so that the position can be freely changed, and the exhaust head can be moved to the exhaust opening of the fixed double-layer glass cell or can be exhausted. Fix the head,
The exhaust opening may be moved.

The double glazing of the present invention is prepared by, for example, but not limited to, the following procedure.

[0031] At least one of the two slightly different sizes of plate glass includes a low-emission plate glass, preferably a silver layer having a thickness of 5 to 30 nm, and one type selected from aluminum, titanium, zinc, tantalum, and nickel-chromium alloy. An antioxidant layer containing the metal selected above, and zinc,
It consists of three kinds of coating layers of an anti-reflection metal oxide layer selected from one or more oxides of tin, titanium, indium, bismuth and zirconium, and is composed of glass / anti-reflection metal oxide layer / silver layer / anti-oxidation layer / Low anti-reflective sheet glass in which each coating layer is laminated in the order of / anti-reflective metal oxide layer or glass / anti-reflective metal oxide layer / anti-oxidation layer / silver layer / anti-oxidation layer / anti-reflection metal oxide layer. The other glass is provided with at least one exhaust opening.

The exhaust opening is preferably provided as close to the corner as possible. Further, in order to prevent the lid member from being displaced from the exhaust opening at the time of sealing and to further reduce the protrusion of the lid member, it is preferable to make the glass surface around the exhaust opening concave.

With one of the glass sheets placed horizontally,
Arrange multiple point, line, or mesh spacers,
The other glass sheet is placed on the spacer, and in this state, the low melting point solder glass is filled on the lower glass sheet at the end face of the upper glass sheet.

An exhaust head is pressed against the exhaust opening,
The sealed space is evacuated to reduce the pressure in the sealed space.

Thereafter, the low melting point solder glass filled over the entire periphery of the two sheet glasses is heated and melted by heating at the working temperature of the low melting point solder glass. At this time, the low-melting-point solder glass at the peripheral portion is removed by capillary action.
It penetrates into the space of sheet glass. After cooling,
The two glass sheets can form a double-layer glass firmly integrated with the low melting point solder glass. Thereafter, the gas in the hollow layer formed by the two sheet glasses is evacuated through an exhaust head while heating in a temperature range of 100 to 450 ° C., and when the pressure is reduced to a predetermined pressure, for example, 10 Pa or less, preferably 1 Pa or less, a lid is formed. The member is heated by a heater provided in the exhaust head, and the lid member is bonded to the exhaust opening with a low melting point solder glass applied to the lid member, thereby producing a double glazing having a low pressure space.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings.

Example 1 FIG. 1 is a plan view of a double-glazed glass to be produced. Large glass 2
The small glass 3 and the small glass 3 are opposed to each other via a dot spacer 5 and are sealed with a low melting point solder glass 8, and the exhaust opening 4 is sealed with a lid member 9.

Each of the two glass sheets has a thickness of 3 mm, the size of the large glass 2 is a float glass sheet of 1040 mm × 1040 mm, and the size of one small glass 3 is 103 mm.
4 mm × 1034 mm float glass sheet. 4 at one corner of small glass 3 at 45 degrees from top
An exhaust opening 4 of 10 mmφ was provided at a position of 0 mm.

The large glass 2 has a low emissivity film having a vertical emissivity of 0.1 coated on the low pressure space side.

First, the small glass 3 is placed horizontally, and a small amount of water droplets is attached to grid points at intervals of 20 mm on which the spherical spacers are to be placed by using a micro syringe or the like, and the diameter is set using a separately prepared vacuum tweezers or the like. A 0.25 mm stainless steel spherical spacer 5 is placed at each water drop position, and then the water drop is allowed to dry naturally so that the spacer 5 is placed on the small glass so that the small glass does not fall even if it is vertical. And fix it.

The small glass 3 is superimposed on the large glass 2 and PbO (85% by weight), B ₂ O ₃ (13% by weight), A
A lead glass powder having a composition of l ₂ O ₃ (1% by weight) and SiO ₂ (1% by weight) and a PbTiO ₃ powder for approximating the thermal expansion coefficient of float glass are in a weight ratio of 60:40.
Paste of low melting point solder glass 8 obtained by adding a binder prepared by mixing butyl carbitol acetate, α-terpineol and cellulose to a glass frit having a softening temperature of 380 ° C. Was applied.

After the application of the low melting point solder glass 8, the binder was first heated to volatilize and burn off the binder of the low melting point solder glass 8 filled in the periphery, and further heated to a working temperature of 470 ° C. to melt the glass frit. After that, the large glass and the small glass were gradually integrated by being gradually cooled, and then maintained at the ambient temperature of 350 ° C., and not shown in the enlarged view of the exhaust pipe and the exhaust opening in FIG. An exhaust head 6 connected to an exhaust unit such as a vacuum pump was pressed against the exhaust opening 4 to reduce the pressure inside the space to 0.1 Pa or less. This depressurizing method was able to reduce the pressure in about 1/3 of the time when the exhaust pipe and the exhaust glass tube as shown in the partial enlarged view of the exhaust opening in FIG. 6 were used. Furthermore, the pressure reached 0.01 Pa, which was 1/10 of the degree of vacuum when evacuated using a glass tube. The heater of the exhaust head was coated with a low melting point solder glass.
A lid member made of alloy No. 6 is placed, and after the pressure is reduced to 0.01 Pa or less, the lid member is heated by a heater, and the lid member 9 is removed from the exhaust opening 4 using an electric motor vertical device (not shown). And the exhaust opening 4 was sealed. FIG.
3 shows a cross section near the opening 4 after the opening 4 is sealed.

The dew point of the low pressure double glazing thus manufactured is -70 degrees or less, and the heat transmission coefficient is 0.6 W / m ^2.
And a low pressure double glazing having good heat insulating properties was obtained.

Embodiment 2 As shown in a partially enlarged view of the exhaust pipe and the exhaust opening in FIG.
Except that the glass surface around the exhaust opening 4 was concave and the exhaust head 6 was convex,
A low pressure double glazing was prepared. FIG. 5 shows a cross-sectional shape near the opening 4 after the opening 4 is sealed.

The time required to reduce the pressure, the degree of vacuum achieved, and the heat transmission coefficient of the produced low-pressure double glazing are as follows:
Almost the same results as in Example 1 were obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of a low-pressure double glazing of the present invention.

FIG. 2 is a partially enlarged cross-sectional view illustrating an exhaust head and an exhaust opening according to the first embodiment.

FIG. 3 is a cross-sectional view of an exhaust opening of the low-pressure double glazing of Example 1.

FIG. 4 is a partially enlarged sectional view showing an exhaust head and an exhaust opening of a second embodiment.

FIG. 5 is a diagram showing a cross section of a concave exhaust opening of the low-pressure double-glazing of Example 2.

FIG. 6 is a sectional view showing an exhaust opening for exhausting using a glass tube of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Low-pressure double glazing 2 Large glass (Low radiation glass) 3 Small glass 4, 4 Exhaust opening 5 Spacer 6, 6 'Exhaust head 7 O-ring 8 Low melting point solder glass 9 Cover member 10 Heater 11 Exhaust pipe 12 Glass tube 13 Concave glass surface

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masahiro Hiragawa 1510 Oguchicho, Matsusaka-shi, Mie Central Glass Co., Ltd. Glass Research Laboratory F-term (reference) 4G061 AA09 BA01 BA02 BA10 CB02 CB14 CD02 CD13 CD14 CD23 CD25 DA30

Claims (5)

[Claims] 1. A two-plate glass is spaced at a predetermined interval, a dot-like, linear or net-like spacer for maintaining this interval is provided, and the peripheral edge of the panel is sealed with a low melting point solder glass. The low-pressure double glazing in which a low-pressure space is formed, wherein an exhaust opening provided for the low-pressure space is sealed with a lid member. 2. The low-pressure double glazing according to claim 1, wherein the glass surface around the exhaust opening provided in the glass is concave. 3. The method according to claim 1, wherein the lid member is made of low melting point glass or 426 alloy.
The low-pressure double-glazed glass according to 1. 4. The method according to claim 1, wherein an exhaust head provided with a heater that moves up and down is used to seal the exhaust opening with a lid member. 5. The method according to claim 2, wherein the exhaust head has a convex shape.