JPH11278877A - Double layer glass having low-pressure space and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide double layer grass having a mow-pressure space with a shorter time for discharge and higher production efficiency and a process for producing the same. SOLUTION: The double layer glass having the low-pressure space is formed by holding two glass sheets 2, 3 at a prescribed spacing by means of dot materials, wires or net-like spacers and hermetically sealing the peripheral marginal edges of these two glass sheets by a sealing material in such a manner that the low-pressure space is formed. In this case, the min. value of the diameter of the discharge port formed at the glass sheets is in a range of 2 to 10 mm. The center of the discharge port 4 preferably exists in the range of 10 to 100 mm from the adjacent two sides of the glass plates.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the fields of construction such as houses and non-housing, transportation such as automobiles, vehicles, ships and aircrafts, and equipment such as refrigerators, freezers, constant temperature and humidity chambers, and heat insulating materials. The present invention relates to a low-pressure double glazing having high heat insulation performance having a low-pressure space inside which is applied to an opening requiring energy saving and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, in order to protect the global environment, it has been strongly required to suppress the emission of carbon dioxide gas by energy saving. Therefore, in all industrial fields, heat insulating members having better heat insulating performance are required. ing. For example, as represented by a thermos bottle, reducing the internal space of a multilayer body to a low pressure is an indispensable technique for improving heat insulation performance. Above all, in order to create a comfortable and healthy living environment with excellent energy saving properties, as a transparent heat insulating member used for the opening, a double-glazed glass with a higher heat insulating performance than before with a low pressure space inside has been proposed. .

For example, Japanese Patent Publication No. 5-501896 discloses a low pressure space, which is interconnected by a peripheral joint of molten solder glass and a plurality of columns arranged with an outer coating of molten solder glass. Insulated glass panels composed of two sheets of glass have been proposed.

For example, Japanese Patent Publication No. Hei 7-508967 discloses that
It consists of two spaced apart glass panes enclosing a low-pressure space and joined together by an array of peripheral joints and columns of fused solder glass, and at least some of these columns are made entirely of metal. Certain thermally insulating glass panels have been proposed.

For example, Japanese Patent Application Laid-Open No. 6-17579 discloses that
A parallel plate made of two glass sheets is separated at a predetermined interval,
A spacer made of low-melting glass or porcelain that maintains this space is fused and disposed with low-melting glass, and the end of this parallel plate is a low-melting sealing material, for example,
A vacuum heat insulating glass plate has been proposed in which a low-melting glass or a low-melting alloy is fused and adhered to form a vacuum space.

For example, Japanese Patent Application Laid-Open No. Hei 8-133795 discloses that
There has been proposed a composite glass plate having a structure in which a sheet glass provided with projections having a constant height is overlapped on a surface having projections, an outer peripheral portion is airtightly bonded with an adhesive to form a space, and the space is evacuated.

[0007]

However, in order to obtain a low-pressure space in each case, an exhaust port is provided at the peripheral edge of one or both glass plates, or at a corner at or near a corner in the plane of one glass plate. Is opened and a vacuum is drawn from an exhaust glass tube fixed to the exhaust port, but the size (diameter) of the exhaust port is not described at all.

[0008] Some of them are commercially available as vacuum double-glazed glass, but the diameter of the exhaust port is usually 1.5 m.
Since it is about m, it takes time to evacuate, and the diameter is too small to be easily broken, so that the production yield is low and the production efficiency is inevitably reduced.

The present invention has been made in view of the above points, and an object of the present invention is to provide a double-glazed glass having a low-pressure space in which the time required for evacuation is reduced and the production efficiency is improved, and a method for producing the same. And

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention holds two glass plates at a predetermined interval and seals the peripheral edges of the two glass plates. In a double-layer glass sealed with a material to form a low-pressure space, the minimum value of the diameter of the exhaust port provided in the glass plate is in the range of 2 to 10 mm.

By making the diameter 2 mm or more, the evacuation time can be shortened and the production efficiency can be improved.
If it is too large, the durability of the sealing portion of the exhaust glass tube may be reduced, and it is not preferable from the viewpoint of aesthetics.
The following is assumed.

When the center of the exhaust port is arranged at a corner portion within a range of 10 to 100 mm from two adjacent sides of the glass plate, not only is it preferable from the viewpoint of aesthetics, but it also comes off the sealing portion at the peripheral edge. When the peripheral portion is sealed, the process can be easily performed without an exhaust glass tube or the like hindering the processing.

In addition, the sealing material is made of at least one of glass, metal / alloy, and organic polymer materials, and has a sealing temperature of 500 ° C. or lower. For example, when using a low radiation plate glass in which one of the plate glasses is coated with a laminate film of Ag and ZnO, the laminated film is damaged even at the heat treatment temperature at the time of sealing the peripheral edge. Nothing.

Further, by making the rare gas constituting the low-pressure space contain a single gas of H ₂ , He, or Ne or a mixed gas of two or more kinds, the air as in the prior art can be obtained. The heat insulation performance can be remarkably improved as compared with the case where is left as a dilute gas.

The dominant heat conduction process in the low-pressure space is mainly radiation, but there is also heat exchange between gas molecules and the plate surface. The magnitude of the heat exchange is defined by the thermal adaptation coefficient, which depends on the type of gas molecules and the type of plate and its surface condition, and the smaller the value, the smaller the rate of heat exchange and the better the heat insulation performance. I do. The gas molecules have a small thermal accommodation coefficient than air, eg, H ₂ as an example of the thermal accommodation coefficient of the gas to platinum surface 0.3, the He is 0.3, Ne is 0.7, the air 0.9 compared to 0.9.

Accordingly, the double glazing of the present invention, which is manufactured by replacing the low pressure space with gas molecules having a smaller thermal adaptation coefficient than air, is different from the conventional low pressure double glazing which is manufactured by simply evacuating air. The heat insulation performance can be remarkably improved in comparison.

In the case where the rare gas contains a single gas of H ₂ , He, or Ne or a mixed gas of two or more types, a method of manufacturing the apparatus is to hold two glass plates at a predetermined interval. And the peripheral edges of the two glass plates are sealed with a sealing material so that a low-pressure space is formed. In this case, air occupying the sealed space is H ₂ , He, After replacing and filling with a single gas or a mixed gas of two or more kinds of Ne, exhaust operation is performed as follows.
It is necessary to form the low-pressure space by repeating the process at least three times, preferably at least three times, so that the number of exhaust processes is increased as compared with the case of air, and the diameter of the exhaust port is made larger than before, that is, the minimum value of the diameter is reduced. Is in the range of 2 to 10 mm, the evacuation time can be greatly reduced, and the effect is amplified. The exhaust port may be formed as a hole having a constant diameter, or may be formed as a mortar-shaped hole.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The two sheet glasses include clear float sheet glass, heat absorbing sheet glass, heat reflecting sheet glass, high-performance heat ray reflecting sheet glass, wire-in sheet glass, net-in sheet glass, template sheet glass, tempered glass, and double-strength glass. , Low-reflection glass, water-repellent glass, hydrophilic glass, photocatalytic glass, conductive glass, highly transparent glass, frosted glass, tapesti (frost) glass, ceramic printing glass, fusion glass, stained glass, laminated glass, Various types of sheet glass such as low-expansion sheet glass (including borosilicate glass) and low-melting point glass can be appropriately combined. Preferred in this case, in this case the invention High is relatively normal emittance CVD
Not only a film formed by a method but also a film formed by a coating film formed by a sputtering method having a low vertical emissivity can be employed.

More preferably, the low emissivity glass sheet has a vertical emissivity of 0.20 or less, preferably 0.10 or less, as defined in JIS R3106-1985 (Testing method for transmittance, reflectance and solar heat gain of the glass sheet). One or more of the following glasses are used, or two glasses having a vertical emissivity of 0.35 or less, preferably 0.25 or less are used.

The thickness of the two glass sheets is usually 1.
A glass having a thickness of 9 mm or more is used. In the case of a tempered glass, especially in the case of a chemically strengthened glass, the thickness is not limited thereto, and a glass having a size of 1.9 mm or less can be used.

In the case of a cylindrical plate, there is no need for a material for geometrically maintaining the interval, but in the case of a flat plate, a material for a point material, a wire or a net spacer for maintaining the interval between two flat plates is used. The material is not particularly limited as long as it is necessary and has a lower hardness than the glass plate to be used and has an appropriate compressive strength, but metals, alloys / irons, ceramics, and plastics are preferable. For metals, iron, copper, aluminum, tungsten, nickel, chromium, titanium, etc.For alloys and steels, carbon steel, chrome steel, nickel steel, stainless steel, nickel chrome steel, manganese steel, chromium manganese steel, chromium molybdenum steel, silicon steel , Brass, solder, nichrome, duralumin and the like are used.

The point material spacers have a shape such as a sphere, a column, or a prism, and are arranged, for example, in a lattice. As the arrangement method, for example, the methods described in Japanese Patent Application Nos. 9-206833 and 9-206835 by the present applicant can be used.

The wire spacer has a cross section of a circle, a semicircle, a square, or the like, and may be linear or curved. A mesh spacer of a square, rhombus, or the like is used. In the case where a metal, an alloy, or steel is coated with ceramics or plastics, the design can be improved by coloring, and reflection unique to the metal can be suppressed.

[0024] The spacing between the point material, wire material or mesh material spacer 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 plates is 0.05 mm or more for both the flat plate and the cylindrical plate.
1 mm or more is preferable. The sealing material used for the peripheral edge portion or the opening of the double-layer glass is made of at least one of glass, metal, and organic polymer materials, and has a sealing temperature of 500 ° C. or less, preferably 300 ° C. The following low melting point materials can be used.

For example, the low-melting glass is processed as a glass rod alone, a glass frit obtained by mixing a glass powder and a ceramic powder, a paste in which the glass frit is dispersed in a vehicle such as amyl acetate, or a wire rod such as a glass rod. What is used, the composition is, for example,
JP-A-49-110709, JP-A-8-119665, JP-A-1-224
No. 248, a low melting point sealing material containing lead silicate glass or lead borosilicate glass alone and a refractory filler or the like described in Japanese Patent Application Laid-Open No. 8-220885 by the present applicant, or For example, JP-A-6-183775, JP-A-6-183775
A low melting point sealing material containing a refractory filler or the like in a lead-free phosphate glass described in JP-A-9-175833 and JP-A-9-188544 is used.

Examples of the low melting point metal include powder metal / alloy alone, paste in which powder metal / alloy is dispersed in a vehicle such as glycerin, wire rod such as metal / alloy rod, and plate-shaped metal. The composition used is, for example, Pb-Sn-B described in JP-A-51-4046.
i-Sb-Zn alloy, Bi-Sn-Sb- described in Japanese Patent Publication No. 6-102579 and Japanese Patent Application No. 9-745516 by the present applicant.
Zn alloy, Japanese Patent Application No. 9-234574 and Japanese Patent Application No. 9-234
Bi-Sn-Ti alloy described in No. 234912, Bi-S
n-Zn-Cu-Ag alloy, Bi-Sn-Zn-Cu-
Ag-P alloy, Sn-Cu-Ni-P alloy, silver copper brazing,
In addition, the applicant filed Japanese Patent Application Nos. 9-112837 and 9-14.
Various metals and alloys described in No. 2499 and the like are used.

For example, an organic polymer material has a moisture permeability (based on a moisture permeability test method of a moisture-proof packaging material specified in JIS Z0208-1976) of 2.0 g as a base material.
/ M ² · 24 h (40 ° C., 90% RH) or less, and a nitrogen permeability coefficient (based on a plastic film for food packaging specified in JIS Z1707-1975) of 1 × 10 ^−6.
cm ³ cm / cm ² sec atm (25 ° C) or less,
The oxygen permeability coefficient (based on the plastic film for food packaging specified in JISZ1707-1975) is 1 ×
10 ^-5 cm ³ · cm / cm ² · atm (25 ° C)
Polyisobutylene (including reactive polyisobutylene) or butyl rubber (including unvulcanized butyl rubber and partially vulcanized butyl rubber), a copolymer containing polyisobutylene as one component, and hot melt butyl (for example, M -145, M-120, 88-7500 manufactured by NSC Japan
Including commercially available compounds), including any resin such as an aliphatic hydrocarbon-based resin, an aromatic hydrocarbon-based resin, an alicyclic hydrocarbon-based resin as a tackifier as necessary, Hydrogenated alicyclic hydrocarbon-based resin, terpene-based resin, cumarone resin, rosin derivative, etc., polybutene, polybutadiene, polyisobutylene, etc. added as plasticizers to achieve self-adhesiveness and flexibility, or Moisture permeability (JIS Z0208-1976)
(Based on the moisture permeability test method for moisture-proof packaging materials specified in)
Is not more than 2.0 g / m ² · 24 h (40 ° C., 90% RH) and has a nitrogen permeability coefficient (based on a plastic film for food packaging specified in JIS Z1707-1975) of 1 × 10 ⁻⁶ cm ³ · cm. / Cm ² · sec · atm (25
° C) or less, and the oxygen permeability coefficient is (JIS Z1707-19)
1 × 10 ^-5 cm ³ · cm / cm ² · sec · at
m (25 ° C) or less that satisfies any or all of the following conditions: epoxy, silicone, polyurethane, polysulfide, polyethylene (including low, medium and high density polyethylene), polypropylene, Teflon (PTFE), polyvinylidene fluoride (PVDF) , Polyacrylonitrile, polymethacrylonitrile, polyesters such as polyethylene terephthalate, polyamides such as nylon 6, nylon 66, polyvinyl chloride, polyvinyl fluoride, and mixtures of two or more organic polymers such as polyimide, Modified, alloy, IPN, etc., combined with a tackifier or a plasticizer as described above, if necessary, or as a filler if necessary, for example, muscovite or phlogopite Such as natural mica,
Synthetic mica, graphite, glass flake, ferrite, clay, talc, hillite, smectite, magnesium silicate, stainless flake, flake filler such as aluminum flake, nickel flake, calcium carbonate, magnesium carbonate, silica, alumina, iron oxide, Particulate fillers such as boron nitride, reinforcing silica, silica sand, sericite, calcium silicate, titanium oxide, kiln ash, glass beads, carbon black, white carbon, and fibrous fillers such as glass fiber, carbon fiber, and aramid fiber Materials can be used, and if necessary, in addition to those described above, flame retardants, silane-based
Adhesion improvers such as titanate / aluminum coupling agents, thixotropy-imparting agents such as bentonite, organic bentonite, montmorillonite, ultrafine powdered silica, ultrafine powder titania, ultrafine powder alumina, methylcellulose, methylcellulose sodium salt, oxidation Magnesium, a thickener such as magnesium hydroxide can be added as appropriate, and when a gas or a low molecular weight substance is transmitted or released into the low-pressure space, the organic polymer material is used to adsorb these substances. At least one or more adsorbents such as silica gel, sintered silica, activated carbon, activated alumina, anhydrous calcium sulfate, zeolite (3A, 4A, 5A, 13X) and an oxygen adsorbent in a total amount of 60
It is preferable that the filling be performed at not more than 50% by weight, preferably at most 50% by weight. In the case where no gas or low molecular weight substance is permeated or released into the low pressure space, the adsorbent may not be filled.

These sealing materials can be provided individually as a low melting point glass, a low melting point metal / alloy, or an organic polymer material. For example, a low melting point glass or a low melting point metal・ Low-melting glass or low-melting metal with an alloy disposed inside on the outside is generally inferior in chemical durability.To protect them, an organic polymer system with excellent chemical durability It is also possible to arrange the material, and to arrange the organic polymer material inside, the low melting point metal / alloy outside, and if necessary, the organic polymer material again outside. Can also.

The rare gas constituting the low-pressure space of the multi-layer glass may be the remaining rare gas after the air is simply evacuated, but it may be a single gas of H ₂ , He, Ne or a single gas. It is preferable that the mixture contains at least two or more kinds of gas mixtures.

The dominant heat conduction process in the low-pressure space is mainly radiation, but there is also heat exchange between gas molecules and the plate surface. The magnitude of the heat exchange is defined by the thermal adaptation coefficient, which depends on the type of gas molecules and the type of plate and its surface condition, and the smaller the value, the smaller the rate of heat exchange and the better the heat insulation performance. I do. These gas molecules of H ₂ , He, and Ne have smaller thermal adaptation coefficients than air. For example, as an example of the thermal adaptation coefficient of gas to the platinum surface, H ₂ is 0.3, He is 0.3, and Ne is Ne. Is 0.7,
It is smaller than 0.9 of air. Therefore, the double glazing of the present invention, which is manufactured by replacing the low-pressure space with gas molecules having a smaller thermal adaptation coefficient than air, is more insulated than the conventional low-pressure double glazing, which is manufactured by simply depressurizing the air. The performance can be significantly improved.

As a method of replacing the rare gas, the air occupying the closed space in the double-layer glass is replaced and filled with a single gas of H ₂ , He or Ne or a mixed gas of two or more types. And then perform one exhaust operation.
At least three times, preferably at least three times.
Further, as another replacement method, air occupying a closed space is first exhausted, and a single gas or a mixed gas of two or more kinds of H ₂ , He, or Ne is filled and replaced.
The operation of evacuating again is repeated at least once, preferably at least three times. In any of the replacement methods, the operation of evacuating the gas occupying the closed space is performed at 500 ° C or less, preferably 200 ° C or less, 130 ° C or more. By performing the heat treatment at the temperature, the low-pressure space having a lower pressure can be formed more quickly. The optimum evacuation operation temperature can be appropriately determined in this range depending on the characteristics of the sealing material used.

As a method for producing a double-glazed glass, other than the operation of replacing and evacuating a gas occupying a closed space, when a low-melting glass is used as a sealing material, for example, Japanese Patent Publication No. 5-501896 JP-A-7-508967, JP-A-6-17579, and a low-melting metal / alloy or / and an organic polymer material is used as a sealing material. In this case, for example, Japanese Patent Application No. 9-107788, Japanese Patent Application No. 9-112837, and Japanese Patent Application No.
142499, 9-142500, 9-154515, 9-74516, 9-206833, 9-206835, 9-206835,
This can be done by the method described in Japanese Patent Application No. 9-234912.

The outline of the method for producing a double-glazed glass will be described.
With two glass plates, one of the glass plates has a size smaller by 0 to 10 mm on each side than the other glass plate, so that it is preferable to easily arrange the sealing material on the periphery of the large glass plate. The glass plate is provided with an exhaust port at the corner so that the exhaust glass tube whose inner diameter is slightly larger than the exhaust port can be placed over the exhaust port, that is, the center of the exhaust glass tube is aligned with the center of the exhaust port. Is fixed to the surface of a small-sized glass plate using In addition, a metal / alloy sealing plate, for example, a Fe—Cr alloy sealing plate may be placed over the exhaust port instead of the exhaust glass tube. In this case, a method in which a sealing material is spotted between the glass plate and the metal / alloy sealing plate, and a method of exhausting air from a gap between the spotted sealing materials can be employed. When the metal / alloy sealing plate is opened in the counterbore portion, the surface can be reduced to the glass plate surface level or less, so that the appearance can be made better than when an exhaust glass tube is used.

On a glass plate of a large size, a small amount of water droplets are first attached to lattice points at intervals where spherical spacers are to be arranged by a microsyringe, and spacers adsorbed with separately prepared vacuum tweezers are arranged on the water droplets. Then, by allowing the water droplets to dry naturally, the spacers can be fixed on a large-sized glass plate with an adhesive strength that does not cause any problem in the operations in the subsequent steps.

Next, another small-sized glass plate is placed thereon and stacked. In this case, a glass plate having a small size is placed and stacked so that the glass plate having a large size is substantially evenly inward from each side.

Next, as a sealing material, a paste-like low-melting glass having a sealing operation temperature of, for example, 430 ° C. is formed on a glass edge portion of a small-sized glass plate and an upper peripheral surface of a large-sized glass plate. It was applied to the character space so as to contact the glass edge portion of the small-sized glass plate and the peripheral upper surface of the large-sized glass plate.

The heat treatment for sealing the peripheral edge portion with the low melting point glass sealing material includes three steps of drying, preliminary calcination, and main calcination. First, as a drying step, heat treatment is performed at 150 ° C. for 10 to 30 minutes to form a paste. The volatile components contained in the paste are removed, and the organic component contained in the paste is burned and removed by heat treatment at 320 to 350 ° C. for 90 minutes or more as a preliminary firing step, and further, at 450 to 500 ° C. for 10 minutes as a main firing step. The above heat treatment is performed to melt seal the glass frit.

As the evacuation process, 130-150 ° C., 60
After evacuation for at least 120 minutes, preferably for at least 120 minutes, the evacuation glass tube is melted and sealed. Melting and sealing of the exhaust glass tube is performed by heating the base fixed to the glass plate of the exhaust glass tube and slightly near the outside with a burner while evacuation, pulling the exhaust glass tube when it softens and melts, cutting and sealing at the same time A commonly used method can be employed. When the air is exhausted while heating, moisture on the glass surface is removed, and the heat insulating performance is improved. In this state, it is necessary to finally seal.

The pressure in the low pressure space of the double glazing is 10 Pa
Or less, preferably 1 Pa or less. Further, if necessary, it is more preferable to protect the end surface of the glass or the like by sticking a tape over a part or the entire periphery of the peripheral end surface of the multilayer body using two glass plates. As this tape, besides a general vinyl resin tape, a polyester film, a fluorine resin, a plastic film such as a silicone resin, an aluminum foil, a metal foil such as a stainless steel foil and a laminated film obtained by laminating them,
Alternatively, a plastic film on which a metal such as aluminum is vapor-deposited, or a tape in which an adhesive is applied to one surface of a base made of various films and sheets such as a soft metal sheet such as lead and zinc can be used.

Further, if necessary, a glazing channel made of resin can be provided over substantially the entire peripheral edge of the double-glazed glass. In order to cover the sealed exhaust glass tube or the metal / alloy sealing plate, it is preferable to bond a resin or metal protective cap having excellent durability.

The double-glazed glass is a double-glazed glass having a low pressure space therein and having high heat insulation performance, and is used in the construction field of houses and non-houses, the transportation field of cars, vehicles, ships, aircrafts, etc., refrigerators, It can be applied to heat-insulating members that require energy saving, such as freezer, constant temperature / humidity bath, and heat-insulating materials.In particular, a multilayer body using a glass plate has a low-pressure space inside. As a multi-layer glass having high heat insulation performance, it can be applied to transparent openings that require energy saving in various fields.

The present invention relates to the field of construction such as residential and non-residential,
Transportation fields such as automobiles, vehicles, ships, aircraft, refrigerators,
It can be a low-pressure double-glazed glass having a high heat-insulating performance and having a low-pressure space inside which is applied to an opening that requires energy saving in the field of equipment such as a freezer, a thermo-hygrostat, and a heat insulating material.

[0044]

Embodiment 1 An embodiment of the double glazing 1 of the present invention is shown in FIGS.

Each of the two glass plates 2 and 3 has a thickness of 3 mm.
Is a clear float plate glass, and one glass plate 2 is 1
The other glass plate 3 has a size of 040 mm × 1040 mm and is smaller by 6 mm on each side than the glass plate 2.
This is a low-emission plate glass having a dimension of mm × 1034 mm and having a special metal film coated on the hollow space side by a sputtering method, and has a vertical emissivity of 0.07. The glass plate 3 is 50 m from two sides adjacent to the corner.
An exhaust port 4 having a diameter of 2 mm is provided at a corner at the position of m.
The low-melting glass sealing material 7 is used so that the exhaust glass tube 5 having an inner diameter of 3 mm is placed over the exhaust port 4, that is, the center of the exhaust glass tube 5 is aligned with the center of the exhaust port 4. Fixed to the surface.

On the glass plate 2, first, a diameter of 0.2
Attempt to place 5 mm Ti spherical spacer 6 2
A small amount of water droplets were attached to grid points at 0 mm intervals with a microsyringe, spacers 6 adsorbed with separately prepared vacuum tweezers were arranged on the water droplets, and then the water droplets were air-dried, whereby the spacers 6 were attached to the glass plate. On top of No. 2, it could be fixed with an adhesive strength that does not cause any problem in the work of the post-process.

Next, another glass plate 3 was placed on top of the glass plate 3 and stacked. In this case, the glass plates 3 were placed on each other so as to be 3 mm inside each side of the glass plate 2 and were stacked. Next, a paste-like low-melting glass having a sealing operation temperature of 430 ° C. as the low-melting glass sealing material 8 is formed into an L-shape formed on the glass edge portion of the glass plate 3 and the upper surface of the glass plate 2 having a width of 3 mm. The coating was applied to the space so as to contact the glass edge portion of the glass plate 3 and the upper surface of the glass plate 2 having a width of 3 mm.

The heat treatment for sealing the peripheral edge with the low-melting glass sealing material 8 comprises three steps: drying, preliminary calcination, and main calcination. First, as a drying step, heat treatment is performed at 150 ° C. for 30 minutes to be included in the paste. The volatile components are removed, and then a heat treatment is performed at 340 ° C. for 90 minutes as a calcination step to burn and remove the organic components contained in the paste.
The glass frit was melt-sealed by heat treatment at 0 ° C. for 10 minutes.

In the evacuation step, after evacuation at 150 ° C. for 120 minutes, the base fixed to the glass plate 3 of the evacuation glass tube 5 is heated with a burner at the root and a little near the outside while evacuation is performed, and when the evacuation glass tube is softened and melted, the evacuation glass tube is used. 5 was pulled, cut and sealed at the same time. When the air is exhausted while heating at 150 ° C., the moisture on the glass surface is removed, and the heat insulating performance is improved. In this state, it is necessary to finally seal.

The evacuation was performed until the pressure dropped to 0.1 Pa. In addition, a butyl rubber tape was applied as the protective tape 9 around the entire periphery. In order to cover and cover the sealed exhaust glass tube 5, a plated ABS resin protective cap 10 was adhered.

The thus obtained 350 mm × 50
For the double glazing 1 of 0 mm size, the initial dew point
According to the method specified in SR 3209-1995, the initial heat transmission coefficient is determined according to JIS A 4710-19.
The initial dew point was −70 ° C. or less, meeting the JIS standard (−35 ° C. or less), the initial heat transmission coefficient was 1.3 kcal / m ² h ° C., and the heat insulation performance was high. After JIS accelerated durability test class III specified in 3209-1995, the dew point is -70 ° C.
It is less than JIS standard (below -30 ° C), the heat transmission coefficient is 1.3kcal / m ² h ° C, and the heat insulation performance is high. In addition, even after the test under severe conditions, the dew point performance and the heat transmission coefficient decrease It was confirmed that it had sufficient durability.

[0052]

As described in detail above, the double glazing having a low pressure space according to the present invention can have a remarkably excellent heat insulating performance.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a manufacturing process of a double-glazed glass 1 having a low-pressure space in Example 1 of the present invention, and is a perspective view before sealing an exhaust glass tube.

FIG. 2 is a cross-sectional view of a main part showing a manufacturing process of the double-glazed glass 1 having a low-pressure space in Embodiment 1 of the present invention, and is a perspective view before sealing an exhaust glass tube.

FIG. 3 is a cross-sectional view of a main part when the double-glazed glass 1 having a low-pressure space according to the first embodiment of the present invention is completed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Double glass 2 Glass plate 3 Glass plate 4 Exhaust port 5 Exhaust glass tube 6 Spacer 7 Sealing material (For exhaust glass tube) 8 Sealing material (For peripheral edge) 9 Protective tape 10 Protective cap

Continuation of the front page (72) Inventor Masahiro Hiragawa 1510 Oguchicho, Matsusaka-shi, Mie Central Glass Co., Ltd.

Claims (5)

[Claims] 1. A low-pressure space is formed by holding two glass plates at a predetermined interval with a point material, a wire, or a mesh-like spacer, and sealing the peripheral edges of the two glass plates with a sealing material. In the multi-layer glass to be formed, the minimum value of the diameter of the exhaust port provided in the glass plate is 2 to 10 m.
m, a double glazing having a low pressure space. 2. The center of the exhaust port is adjacent to a center of the glass plate.
The double-glazed glass having a low-pressure space according to claim 1, wherein the distance is within a range of 10 to 100 mm from a side. 3. The sealing material is made of at least one of glass, metal / alloy, and organic polymer materials, and is a low melting point material having a sealing temperature of 500 ° C. or less. The double-glazed glass having a low-pressure space according to claim 1. 4. The rare gas constituting the low-pressure space is H ₂ ,
The double-glazed glass having a low-pressure space according to any one of claims 1 to 3, wherein a single gas or a mixed gas of two or more of He and Ne is contained. 5. The two glass plates are held at a predetermined interval, and the peripheral edges of the two glass plates are sealed with a sealing material so that a low-pressure space is formed. In a method of manufacturing a double-glazed glass in which a rare gas constituting a space contains a single gas of H ₂ , He, or Ne or a mixed gas of two or more types, a minimum value of a diameter is provided on one glass plate. Is provided with an exhaust port in the range of 2 to 10 mm, and the air occupying the closed space is replaced and filled with a single gas in H ₂ , He, Ne or a mixed gas of two or more types.
A low-pressure space is formed by repeating the operation of evacuating at least once to form a low-pressure space, and thereafter sealing the exhaust port to form the closed low-pressure space. A method for producing a laminated glass.