JPH1179798A - Double glazing and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the manufacture of the double glazing by which the unit having high mechanical strength can be manufactured and the manufacturing process stages for the unit can be simplified and also, high reliability with respect to sealing of the glazing can be attained and further, problems such as the reduction in workability due to the dripping of a second sealing material can be eliminated, and also, to provide the unit manufactured thereby. SOLUTION: In this manufacture, a spacer of this unit consists of at least two layers, namely: a first spacer 4 that is formed by filling a hollow section of a metallic cylindrical hollow body with a desiccant 6 and coating a part of the outer surface of the metallic cylindrical hollow body, which part is to be joined to glass by tacky adhesion, with a moisture-impermeable resin composition having self-tacky adhesiveness; and a second spacer 8 consisting of a cord-like curable resin layer. The manufacture comprises: sticking the first spacer 4 and the second spacer 8 on one of two flat glass plates at the peripheral edge; thereafter, sticking the other flat glass plate on the first and second spacers 4 and 8; then, further sticking all the spacers 4 and 8 and flat glass plates together with a pressure to form them into an integrally-joined body by tacky adhesion; and thereafter, curing the second spacer 8 of this integrally-joined body to form the integrally-joined body by tacky adhesion into an integrally-joined body by firm adhesion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-glazed glass having a heat insulating property, and is used for a construction field such as a house and a non-house, an automobile,
It is applied to openings that require energy saving, such as in the transportation field of vehicles, ships, aircraft, etc., and in the field of equipment such as freezers, freezer showcases, and temperature and humidity chambers.

[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.
Various things are used as this double glazing,
Proposed.

[0003] For example, as a spacer for a double-glazed glass, there is known a hollow cylindrical body made of aluminum filled with a desiccant as disclosed in JP-A-59-45149. This cylindrical aluminum spacer is cut into predetermined dimensions in advance, and after filling the hollow portion with a desiccant, each end is joined using a corner connection key, or the hollow portion is filled with a desiccant, After bending into a predetermined shape, the ends are joined using a connection key and assembled into a frame. Next, a butyl rubber-based sealing material was applied as a primary sealing material to two surfaces of the cylindrical aluminum spacer frame bonded to the glass, and this was affixed slightly inside the peripheral edge of one of the plate glasses. After that, the other glass is pasted on it, pressed and bonded, and integrated with each other to form a hollow space with the two glass sheets and the spacer. Then, the outer cross section is formed into an open concave space having a substantially U-shaped cross section. At present, the so-called dual-seal double-glazing system, which is produced by applying and filling a liquid polysulfide, silicone, or polyurethane resin as a secondary sealing material and curing it at a temperature around room temperature, is currently the most common one. is there.

For example, Japanese Patent Publication No. Sho 63-50508 and Japanese Patent Application Laid-Open No. Hei 6-123191 disclose a continuous rigid spacer, for example, a corrugated aluminum plate, in a self-adhesive resin layer filled with a desiccant. After sticking a string-shaped thing with embedded etc. on the inside of the peripheral edge of one sheet glass, the other sheet glass is stuck on it and crimped, adhesively integrated, sealed with two sheet glass and spacer A so-called single-sealed double-glazed glass produced by forming a hollow space is described, and some of them are currently partially used.

For example, Japanese Patent Application Laid-Open No. 7-291677 discloses that
In a multi-layer glass in which a plurality of glass plates are polymerized and integrated by a joining member with an air layer interposed between parallel glass plates, an additional reaction type in which the joining member is adhered around the periphery of the glass plate. It is made of an elastic body having an adhesive layer on both sides, is pressed into contact with a reaction catalyst layer between the additional reaction type adhesive layer and the glass, and is integrated with the addition reaction type adhesive layer by a curing reaction. The joining member is provided with a concave groove, and the outer peripheral surface of the joining member is covered with a foil-like gas barrier material such as a metal foil including the concave groove by joining or drawing, and the concave groove is filled with a moisture absorbent. Further, a double-glazed glass characterized by preventing the intrusion of water molecules by bonding a glass plate with a foil-like gas barrier material such as the metal foil using a low melting point metal is described. .

For example, Japanese Patent Application Laid-Open No. 9-77536 discloses that
Two or more glass plates are opposed to each other via a resin spacer so as to form a hollow layer, and a concave portion is formed between the peripheral portion of the glass plate and the outer peripheral portion of the spacer, and the concave portion is filled with a sealing material. In the double-glazed glass obtained, the double-glazed glass is characterized in that the sealing material exhibits fluidity at a temperature of 60 ° C or higher, and has a JISA hardness of 25 to less than 70 at 25 ° C. Are listed.

[0007]

However, the above-mentioned double-layer glass using a cylindrical aluminum spacer described in, for example, Japanese Patent Laid-Open No. 59-45149, has two sheets of glass and a cylindrical aluminum spacer. A liquid polysulfide-based, silicone-based, or polyurethane-based resin is applied and filled as a secondary sealing material in an open concave space having an approximately U-shaped outer cross-section formed by curing at a temperature around room temperature. Since the secondary sealing material is liquid, if the control of the application process is poorly controlled, dripping will occur, resulting in reduced workability and product contamination such as plate glass contamination. There is a problem that the yield decreases. In addition, the entire production line may stop.

For example, the double glazing described in JP-B-63-50508 and JP-A-6-123191 has a simplified manufacturing process and a relatively low manufacturing cost, but has a desiccant. The adhesive strength between the self-adhesive resin layer filled with and the sheet glass is significantly reduced, for example, when stored in a high-temperature atmosphere such as in the summer. There is a problem that deformation is likely to occur, and in order to prevent this shear deformation, cylindrical aluminum is inserted into an open concave space with a substantially U-shaped outer cross-section formed by two sheet glasses and spacers. As in the case of using a spacer, a liquid polysulfide-based, silicone-based, or polyurethane-based resin may be applied and filled as a secondary sealing material. There is a problem that the cost is higher than the pacer method.

In addition, when a liquid material is applied and filled as a secondary sealing material, if the control of the application step is poorly controlled, liquid dripping will occur, thereby lowering the workability, and contaminating the glass sheet. There is a problem that the yield decreases. In addition, the entire production line may stop.

[0010] For example, in the double-glazing disclosed in Japanese Patent Application Laid-Open No. 7-291677, the reaction catalyst layer is separated from the release / carrier sheet and transferred to the bonding-facing surface of the glass plate, and the elastic body as a bonding member The adhesive layer is pressed into contact with the additional reaction type adhesive layer provided on both sides to integrate the curing reaction.The reaction catalyst layer as the curing agent and the additional reaction type adhesive layer as the main agent are separated, so the reaction catalyst layer is The process of releasing and transferring from the carrier sheet to each of the two glass plates is complicated, and the outer peripheral surface of the joining member is covered with a foil-like gas barrier material such as a metal foil, including a concave groove. Alternatively, the process of drawing is also complicated, and a process of applying a low-melting metal layer to the glass contact surface of a foil-like gas barrier material such as a metal foil, and then melting and heating after the assembly setting to integrate and bond. Also A miscellaneous.

[0011] For example, the double-glazed glass described in Japanese Patent Application Laid-Open No. 9-77536 is arranged such that two or more glass plates are opposed to each other via a resin spacer so as to form a hollow layer. In a double-layer glass in which a concave portion is formed at a peripheral portion and an outer peripheral portion of a spacer and the concave portion is filled with a sealing material, the sealing material exhibits fluidity at a temperature of 60 ° C. or more, and has a JISA at 25 ° C. Hardness 2
It is made of a thermoplastic resin of 5 or more and less than 70, and the step of heating and melting the thermoplastic resin to show fluidity and filling the concave portion using an extruder or the like requires a precise control device. Therefore, there is a problem that the initial capital investment amount is large. In addition, when there is no eaves due to strong direct sunlight such as in summer, the temperature of the aluminum sash may reach 60 ° C. or higher, and plastic deformation due to expansion in the aluminum sash is likely to occur. There is.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has the advantage of using a metal spacer, which is advantageous in that it has high mechanical strength, and has a primary sealing material and a secondary sealing material. Instead of disposing the dressing in completely different steps as in the prior art, it is possible to dispose it in successive steps, so that the manufacturing process can be simplified and high sealing can be achieved. Reliability can be achieved simply and therefore manufacturing costs can also be reduced.

Further, since the secondary sealing material is not coated in a liquid state as in the prior art, but is formed in a string shape in advance, the secondary sealing material is generated when the control and adjustment of the coating process are poor. There is no problem that the work yield is reduced due to dripping liquid or the product yield is reduced due to contamination of the plate glass, and the situation does not cause the entire production line to stop.

Further, the second spacer in the uncured or semi-cured state is not a material in which the main agent and the curing agent are separated, but is a mixture in which the main material and the curing agent are separated from each other. Such a complicated step can be omitted.

Further, by curing the second spacer in an uncured or semi-cured state, it can be strongly adhered and integrated with the sheet glass at the same time, especially when stored in a high temperature atmosphere such as in summer. However, it can be assumed that shear deformation does not occur,
For example, when there is no eaves due to strong direct solar radiation such as in summer, the temperature of the aluminum sash may be 60 ° C. or more, and there is no problem that plastic deformation due to expansion occurs in the aluminum sash.

The secondary sealing material is formed by applying a liquid curable resin as in the prior art, or a thermoplastic resin is heated and melted to show fluidity, and the concave portion is formed by using an extruder or the like. It is not necessary to fill the material, but only to arrange and cure the uncured or semi-cured curable resin layer formed in a string shape in advance. The amount can be kept small.

[0017]

In order to solve the above-mentioned problems, the present invention relates to a double-glazed glass, wherein the spacer is at least two of a first spacer and a second spacer.
The first spacer is formed by filling a hollow portion of a metallic tubular hollow body with a desiccant, and has a self-adhesive property to a portion of the metallic tubular hollow body that is adhesively bonded to glass. The second spacer is formed of a string-like curable resin layer, with the first spacer inside and the second spacer outside. , Each of which is provided with a spacer.

Further, as a method for producing the spacer, the spacer is composed of at least two layers of a first spacer and a second spacer, and the first spacer is filled with a desiccant in the hollow portion of the metal cylindrical hollow body. And a self-adhesive moisture-impermeable resin composition is applied to a portion of the outer surface of the metal cylindrical hollow body which is adhesively bonded to the glass, and the second spacer is uncured or It is made of a deformable curable resin layer obtained by molding into a semi-cured string, and is attached to the peripheral edge of one of the glass sheets or slightly inside with the first spacer inward. After that, the other glass sheet is stuck thereon and pressure-bonded to form an integrated adhesive.
By hardening the spacer at the same time, it is strongly bonded and integrated with the sheet glass,
By successively arranging the separated spacers one after the other and by sticking and integrating them, the manufacturing process can be simplified and the structure can be sealed as a dual-seal system. The wearing reliability can be easily achieved, and the manufacturing cost can be reduced.

Further, since the secondary sealing material is not applied in a liquid state as in the prior art, but is applied in the form of a string as the second spacer in advance, the application process is controlled and adjusted. There is no problem that the workability is reduced due to the dripping that occurs when the quality is poor and the product yield is reduced due to the contamination of the plate glass, and the situation does not cause the entire production line to stop.

In addition, by curing the second spacer in an uncured or semi-cured state, it can be simultaneously strongly bonded and integrated with the plate glass, so that it can be stored in a high-temperature atmosphere such as in summer. Even in such a case, it can be assumed that shear deformation does not occur.Also, in the case where there is no eaves due to strong direct solar radiation such as in summer, the temperature of the aluminum sash may be 60 ° C. or more, There is no problem that plastic deformation due to expansion occurs in the sash.

The secondary sealing material is coated with a liquid curable resin as in the prior art, or a thermoplastic resin is heated and melted to show fluidity, and the concave portion is formed using an extruder or the like. It does not require a precise control device because it is only necessary to dispose and cure the second spacer in an uncured or semi-cured state that has been previously formed into a string, instead of filling it. The amount can be kept small.

It is also possible to attach the second spacer after sticking the two glass sheets with the first spacer.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Two sheets of glass are clear float glass, heat-absorbing glass, heat-reflecting glass, high-performance heat-reflecting glass, wire-in glass, net-in glass, template glass, tempered glass, and double-strength glass. Various types of plate glass such as low reflection plate glass, high transmission plate glass, frosted glass, tapesti (frost) glass, ceramics printed glass, fusion glass, stained glass, laminated glass can be appropriately combined. It is preferable to use a low radiation plate glass coated with a metal film.

More preferably, the low emissivity glass sheet has a vertical emissivity of 0.20 or less, preferably 0.2 mm or less as defined in JIS R 3106-1985 (Testing method for transmittance, reflectance and solar heat gain of the glass sheet). 10 or less glass or one with a vertical emissivity of 0.35
The following two, preferably 0.25 or less glasses are used. The thickness of the two glass sheets is usually 1.9 mm or more, but in the case of tempered glass, especially in the case of chemically strengthened glass, etc. Can be used. As the two glass sheets, a two-dimensional or three-dimensional curved glass can be used in addition to the flat glass sheet.

Although two sheets of glass are used here, three or more sheets of glass may be used in combination. Further, resin glass such as an acrylic plate and a polycarbonate plate may be used, and is not particularly limited.

The first spacer is formed by filling a hollow portion of a metal hollow cylindrical body with a desiccant, and has a self-adhesive property at a portion of the outer surface of the hollow cylindrical metal body which is adhesively bonded to glass. It has been applied with the moisture-impermeable resin composition. For example, an aluminum spacer, which is widely used at present, is most easily available, but an iron or stainless steel spacer having a smaller thermal conductivity than aluminum is preferable because of its excellent heat insulating property. However, the present invention is not limited to these. This cylindrical aluminum spacer is provided with a ventilation hole on the hollow space side, and through this ventilation hole, water vapor in the hollow space is adsorbed by a desiccant filled in the hollow portion of the aluminum spacer, thereby forming a hollow space. This cylindrical aluminum spacer can be kept in a dry state, cut into a predetermined size in advance, and after filling the hollow part with a desiccant, each end is made of, for example, a resin or metal corner connection key. After joining, or filling the hollow part with a desiccant and bending it into a predetermined shape, the ends are joined using, for example, a resin or metal connection key, or an aluminum spacer. After processing into a shape that allows the ends to be joined, they are joined and assembled into a frame. Next, a moisture-impermeable resin composition having self-adhesiveness is applied as a primary sealing material to two outer surfaces of the cylindrical aluminum spacer frame that are adhesively bonded to glass.

In the first spacer, the moisture-impermeable resin composition having self-adhesiveness is caused by moisture permeating from the outside, moisture released from the resin composition itself, a low molecular weight plasticizer, and the like. It is required that there be no problems such as internal condensation that is visually observed in the hollow space or clouding defects called so-called fogging, and that it can be formed into a string shape. Examples of rubbers and elastomers include polyisobutylene (including reactive polyisobutylene), butyl rubber (including unvulcanized butyl rubber and partially vulcanized butyl rubber), and copolymers containing polyisobutylene as one component, so-called hot melt butyl. Or an aliphatic hydrocarbon-based resin, an aromatic hydrocarbon-based resin, or an alicyclic Hydrocarbon resin, hydrogenated alicyclic hydrocarbon resin, terpene resin, coumarone resin, rosin derivative, etc.Addition of polybutene, polybutadiene, polyisobutylene etc. as plasticizers to increase self-adhesiveness and flexibility Kneading by introducing the main compounding composition such as a resin and a desiccant using a kneading machine such as a kneader, particularly preferably a closed kneading machine in which undesirable gas such as steam does not enter and exit. After that, by using a coating machine equipped with an extrusion mechanism and extruding from a die into a string shape having a substantially rectangular cross section, for example, the outer two surfaces of the aluminum spacer frame that are adhesively bonded to the glass are simultaneously formed. It is applied as a primary sealing material.

As the drying agent, silica gel, sintered silica,
It contains at least one or more adsorbents such as activated carbon, activated alumina, anhydrous calcium sulfate and zeolite (3A, 4A, 5A, 13X) as essential components. The form of the desiccant is powder, granule, rod, etc. Is used,
Although not particularly limited, any particle diameter may be used so long as the desiccant does not leak to the hollow space side from the ventilation hole provided on the hollow space side of the aluminum spacer.
Those having a size of from 2 μm to 2380 μm are used.

In the second spacer made of the uncured or semi-cured curable resin composition, the curable resin (including rubber and elastomer) may be a polysulfide-based, silicone-based, polyurethane-based, or epoxy-based resin. , An unsaturated polyester-based curable resin, or an epoxy urethane-based, epoxy silicone-based, epoxy polysulfide-based modified, mixed, or interpenetrating polymer network (IPN: Interpen)
Educating Polymer Network)
The curable resin contains any of the curable resins obtained by such techniques, and various fillers can be used, for example, silica gel, sintered silica, activated carbon, activated alumina, and sulfuric anhydride. Adsorbents such as calcium and zeolite (3A, 4A, 5A, 13X), natural mica such as muscovite and phlogopite, synthetic mica, graphite,
Glass flakes, ferrite, clay, talc, hillite, smectite, magnesium silicate, stainless flakes, aluminum flakes, flake fillers such as nickel flakes, calcium carbonate, magnesium carbonate, silica, alumina, boron nitride, reinforcing silica, Silica sand, sericite, calcium silicate, titanium oxide, kiln ash, glass beads, particulate fillers such as carbon black and white carbon, and fibrous fillers such as glass fiber, carbon fiber, and aramid fiber can be used. Processed fibers, for example, a fiber-like material such as a string-like material, a rope, a felt, a non-woven fabric, a woven fabric or a knitted fabric obtained by bundling the fibers can be used as a core material. , Flame retardant, silane, titanate, al Adhesion improvers such as ammonium based coupling agents, bentonite, organic bentonite, montmorillonite, ultrafine powder silica, ultrafine powder titania, thixotropy imparting agents such as ultrafine powder alumina, methylcellulose, methylcellulose sodium salt, magnesium oxide, hydroxide A thickener for adjusting the viscosity of magnesium or the like can be added as appropriate. These fillers contain 60 wt% or less, preferably 50 wt% or less.

The second spacer is made of a resin and a curing agent by using a kneading machine such as a kneader, as in the case of the self-adhesive moisture-impermeable resin composition used for the first spacer. After charging and kneading various compounding compositions such as filler, by extruding into a string shape having a substantially rectangular cross section from a die using an extruder or the like,
The second spacer in an uncured or semi-cured state can be formed.

When various fibers are processed as a filler, for example, when a fiber processed material such as a string-like material, a rope, a felt, a nonwoven fabric, a woven fabric or a knitted fabric, which is a bundle of fibers, is used as a core material, a resin is mixed with a kneader. After adding and kneading various compounding compositions such as curing agents and other fillers other than the fiber-processed material, the resulting liquid kneaded material is impregnated into the fiber-processed product to form a string having a substantially rectangular cross section. By molding, the second spacer in an uncured or semi-cured state using a fiber processed product as a core material can be formed.

In addition, the second spacer in the uncured or semi-cured state formed in a string shape has to be considered so as not to contaminate the adhesive surface.
If used after a while after molding,
In order not to contaminate the adhesive surface, for example, films such as polyethylene, polypropylene, polytetrafluoroethylene, polyesters such as polyethylene terephthalate and the like, and more preferably mold release properties such as kraft paper and films and sheets coated with a silicone release agent It is preferable that the storage is managed after the substrate is brought into close contact.

The curable resin composition constituting the second spacer is controlled at room temperature or low temperature for an appropriate time, that is, after mixing these compositions, by controlling the curing reaction according to the type of the curable resin. , Which can be maintained in an uncured or semi-cured state until the production of a multi-layer glass, and can be formed into a string as a spacer, and the string can be deformed so as to conform to the shape of the glass And, even if it is bent at the corner, it can hold almost the same shape,
In addition, by exhibiting an appropriate elastic modulus and adhesive strength after curing, it is possible to prevent the occurrence of shear deformation even when the double-glazed glass is stored in a high-temperature atmosphere, especially in summer. Further, even in a case where there is no eaves and the temperature of the aluminum sash is 60 ° C. or more due to strong direct solar radiation such as in summer, there is no problem that plastic deformation due to expansion occurs in the aluminum sash.

In order for the curable resin composition to be maintained in an uncured or semi-cured state, the curing reaction is controlled in accordance with the type of the curable resin. For example, a curing agent and a reaction inhibitor are appropriately selected. Then, if necessary, it is achieved by pretreatment such as aging, for example, a one-component type using a latent curing agent method or a self-curing method,
A so-called “B stage” method can be adopted. The term "B stage" as used herein refers to a semi-cured state originally maintained by controlling the curing reaction, but even in a state almost uncured, a chemical thickener or the like is used. It also includes an apparent semi-cured state which is thickened by the addition.

The latent curing agent method is a method in which a heat-reactive curing agent which is activated at a certain temperature or higher or an ultraviolet curing agent which is activated at a certain ultraviolet ray or more is previously mixed. The curing reaction hardly progresses, or the curing reaction hardly progresses with the amount of ultraviolet light at a normal indoor lighting level, but the curing reaction rapidly increases when heated above a certain temperature or irradiated above a certain amount of ultraviolet light. It is a method that utilizes a progressing curing agent.

On the other hand, the self-curing method is a method utilizing a curing reaction between terminal groups of the molecule itself. Examples of the latent curing agent include DETA and DE for epoxy resin.
ATA, BF3-MEA, phthalic anhydride, HHPA,
It is a curing agent such as 1,8 DAPM, 4,4'MDA, dicyandiamide and the like. For unsaturated polyester resins, curing catalysts such as t-butyl peroxybenzoate, benzoyl peroxide, methyl ethone ketone peroxide and cobalt naphthenate are known. Have been.

For silicone resins (including rubbers and elastomers), condensation type, addition type,
It is classified into radical type, each is classified into one-component type and multi-component type according to the packaging form, and each is classified into room-temperature curing and heat-curing according to curing conditions, and basically belongs to any classification can be applied However, the condensation type has by-products and generally has a short pot life (pot life), while the addition type has no by-products and has a relatively long pot life and is relatively easy to adjust. For example, the reaction rate can be adjusted by heating and a reaction inhibitor, that is, the curing rate has a large temperature dependency, and the curing is performed in a short time as the temperature is increased, and the type and amount of the platinum catalyst are changed in a two-component form. By using a reaction inhibitor, the curing speed can be changed quite freely at 100 to 200 ° C., and if their inhibitory action is strengthened, long storage at low temperature even if mixed in a one-component form is long. period Since it can be cured or held in a semi-cured state, easy addition type handling, further addition type ones also self-adhesive pre adhesiveness improving agent is added in the preferred.

That is, those classified as so-called addition type heat-curable silicone rubber adhesives are preferable. The addition type heat-curable silicone rubber adhesive will be described in more detail. The main component is an organopolysiloxane containing an alkenyl group such as an aliphatic unsaturated bond vinyl group, the crosslinking agent is a hydrogen organopolysiloxane, and the curing catalyst is platinum. Compounds, such as alcohol-modified complexes,
Platinum complexes such as methylvinylpolysiloxane complex and divinyldisiloxane complex are most commonly used. Examples of the reaction inhibitor include methylvinylcyclotetrasiloxane, acetylene alcohols, siloxane-modified acetylene alcohols, and hydroperoxides. As the enhancer, for example, reinforcing silica, surface-treated reinforcing silica, and vinyl group-containing silicone resin are used. The reinforcing silica and the surface-treated reinforcing silica have a BET specific surface area of 80.
Those having an m ² / g or more are particularly useful, and siloxane, carbon functional silane, for example, 3-acryloxypropyltrimethoxysilane, 3
-Methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 2- (3,4-
Epoxycyclohexyl) ethyltrimethoxysilane, etc., as a hydrosilyl group, an oxirane group,
Those having an alkoxysilyl group are mainly used,
In addition to these main components, further fillers, bentonite, organic bentonite, montmorillonite, ultrafine powder silica, ultrafine powder titania, thixotropy imparting agents such as ultrafine powder alumina, methylcellulose, methylcellulose sodium salt, magnesium oxide, water Thickeners for adjusting the viscosity of magnesium oxide and the like are added as necessary, and by appropriately selecting the types and amounts thereof, the curing reaction is controlled and within predetermined time under predetermined environmental conditions, that is, After mixing the composition, it can be kept in an uncured or semi-cured state until a double-glazed glass is produced, and can be formed into a string as a spacer, and the string conforms to the shape of the glass. It can be deformed into a shape, and even if it is bent at the corner, it is almost the same shape Are those capable of holding, and is intended also has some self-adhesive, and after curing by expressing bond strength and appropriate elasticity modulus,
Even when the double glazing is stored in a high temperature atmosphere such as in summer, shear deformation can be prevented.

In addition, even in a case where there is no eaves and the temperature of the aluminum sash becomes 60 ° C. or more due to strong direct sunlight such as in summer, plastic deformation due to expansion occurs in the aluminum sash. And no self-adhesion.

The hardness of the second spacer is JIS K6
According to the method defined in No. 301, the JISA hardness in an uncured or semi-cured state is less than 20, preferably 15
Less than, the JISA hardness after curing is 25 or more,
It is less than 70, preferably 30 or more and less than 65.

A method of firmly bonding and unifying the second spacer in an uncured or semi-cured state after curing to a plate glass is to determine whether the curable resin composition inherently has self-adhesiveness. Alternatively, in addition to the method described above in which self-adhesiveness is exhibited by adding an adhesiveness improver in advance, a method of performing a pretreatment with a primer can also be employed.

As the filler for the second spacer, among the fillers, natural mica such as muscovite and phlogopite, synthetic mica, graphite, glass flake, ferrite, talc, stainless flake, aluminum flake, nickel flake Flaky fillers such as flakes are particularly preferred, and compositions filled with these can suppress gas permeability such as water vapor, argon gas, krypton gas, xenon gas, sulfur hexafluoride gas and liquid permeability such as water. In addition, the second spacer filled with the flake-shaped filler controlled in a direction substantially perpendicular to the glass surface is more permeable to gas such as water vapor and more permeable to liquid such as water than the second spacer randomly filled. This is more preferable because the properties can be further reduced. The flake-like filler has a flake diameter of 10 to 2000 μm, a flake thickness of 1 to 200 μm, and an aspect ratio of 5-2.
000, preferably with a flake diameter of 50 to 1
000 μm, flake thickness in the range of 2 to 100 μm, and aspect ratio of 10 to 500.

As a method for producing a second spacer in which the flake-like filler is filled with the orientation controlled substantially perpendicular to the glass surface, for example, a flake-like filler having a flake diameter of several hundred μm, a flake thickness of When using a thing of several μm, the kneaded material obtained by mixing and kneading various compounding compositions such as a resin, a curing agent, a flaky filler and other fillers using a kneading machine, first, a calender Forming into a film with a thickness of several hundred μm using a molding machine or extruder, or forming into a film slightly thicker than several hundred μm using an extruder, etc. When stretched, shear deformation is applied to the kneaded material at the time of molding, so that the flake-like filler filled in the film-like material can be controlled in orientation substantially parallel to the film surface, By laminating several tens of film-like materials, it is possible to produce a string-like curable resin composition of a predetermined thickness filled with the flake-like filler is almost controlled in orientation, this string-like filler The curable resin composition can be produced by arranging the flake-like filler on the glass surface in a direction in which the orientation can be controlled to be substantially perpendicular to the glass surface and controlled to be filled.

The deformable second spacers in the uncured or semi-cured state obtained by forming the first spacers into a string shape are successively successively separated as spacers, and the first spacers are separated from each other. With the second spacer in the uncured or semi-cured state on the inside, and the outside using the positioning and bonding jig as necessary, at the peripheral edge of one of the glass sheets or at a predetermined position slightly inside thereof, work,
Alternatively, it can be provided by a semi-automatic or fully-automatic mechanical system, and can be temporarily fixed because the inner first spacer has self-adhesiveness.

Thereafter, the other plate glass is attached and bonded by pressure bonding to integrate the adhesive, thereby simplifying the manufacturing process. The entire multi-layer glass obtained in this manner is introduced into a heating furnace, or only the second spacer in an uncured or semi-cured state is heated to cure the second spacer, thereby simultaneously forming the sheet glass with the sheet glass. It is strongly bonded and integrated to obtain a sealed double-glazed glass having a configuration corresponding to the dual seal system.

The heat curing can be carried out in a temperature range of 80 to 200 ° C., preferably in a temperature range of 100 to 150 ° C. In addition, in order to more firmly bond and integrate in this curing step, before the introduction to the curing step, the entire multilayer glass was pressed at such a pressure that the total thickness of the multilayer glass was only slightly reduced, and the pressure was increased. It is cured as it is, or it is cured while passing between the rolls while applying pressure to the whole multi-layer glass by passing between multiple rolls adjusted so that the roll interval is gradually narrowed only slightly Good. As a method of curing the second spacer in an uncured or semi-cured state, if it can be firmly bonded and integrated with a sheet glass, other than heat curing, for example, ultraviolet curing, electron beam curing, etc. It does not matter how.

The deformable second spacers in the uncured or semi-cured state obtained by forming the first spacers into a string shape are successively successively separated as spacers, and are separated from one another by the peripheral edge of one sheet glass. When arranged at the end or a predetermined position slightly inside the end by hand using a positioning and bonding jig as necessary, or by semi-automatic or fully automatic mechanical system, the ends of the spacer Is the second spacer in the uncured or semi-cured state where the ends of the first spacer are joined together as described above.
After the ends of the spacers are pressed and joined together, for example, the entire double-glazed glass is introduced into a heating furnace, and the second spacer in an uncured or semi-cured state is cured. To obtain a double-glazed glass.

However, if the end portions of the second spacer in the uncured or semi-cured state have insufficient self-adhesiveness, there is a concern that a gap may remain. The gap can be filled with a moisture-impermeable resin composition having the same self-adhesiveness as that used for the first spacer disposed inside, so that sealing reliability can be further ensured. .

For example, when the entire double-glazed glass is introduced into a heating furnace and the second spacer in an uncured or semi-cured state is cured so as to be simultaneously firmly bonded and integrated with the plate glass, the air in the hollow space is required. Problems such as image distortion caused by thermal expansion of the layer, or conversely, problems such as image distortion caused by thermal contraction of the air layer in the hollow space when the air temperature in the hollow space drops to around room temperature In order to prevent the generation of water, the moisture-impermeable resin composition having the self-adhesive property of the first spacer is not applied to the entire periphery before being introduced into the heating furnace, but is partially applied to the joint. Or a gap is provided without bringing the ends of the second spacer into close contact with each other, and similarly, the ends of the second spacer are not joined with each other, and the position of the gap provided in the first spacer and the second For the spacer Substantially coincide with the position of vignetting the gap, for example in advance provided about 2mm gap from 1 mm,
After the heat curing, when the air temperature in the hollow space decreases to around room temperature, a moisture-impermeable resin composition having the same self-adhesiveness as that used for the first spacer disposed inside is provided in the gap. Filling can ensure the sealing performance.

In this case, for example, when an ultrasonic welding device is used, the self-adhesive moisture-impermeable resin composition filled in the gap and the plate glass are integrated, and the self-adhesive moisture filled in the gap is filled. Adhesive integration between the minutely impermeable resin composition and the end of the already arranged spacer,
Both are more robust, and the sealing reliability can be further ensured.

Alternatively, a pipe having an inner diameter of, for example, about 1 mm to 2 mm is embedded in a portion where the ends of the spacer are joined so that the hollow space communicates with the outside air. When the temperature dropped to around room temperature, the pipe was withdrawn and the first
The sealing performance can be ensured by filling a moisture-impermeable resin composition having the same self-adhesiveness as that used for the spacer.

Alternatively, without removing the pipe, filling and embedding a moisture-impermeable resin composition having the same self-adhesive property as that used for the first spacer disposed inside the hole of the pipe or the entire pipe. Sealing performance can be ensured.

Alternatively, when the pipe is made of a material having a small gas permeability coefficient, for example, a plastic such as polyethylene, polyethylene terephthalate, or polyvinylidene fluoride, or a plastic on which a metal such as aluminum is deposited, the air temperature of the hollow space is reduced. The sealing performance can be ensured by sealing the pipe by heat sealing or the like when the temperature has dropped to around room temperature.

The moisture-impermeable resin composition having self-adhesiveness that fills the gap between the ends of the spacer has been described as being the same as that used for the first spacer disposed inside. However, in order to more reliably fill the gaps, it is desirable to have a higher self-adhesiveness.Therefore, a material that is not filled with a desiccant or other filler, or a material with a reduced filling rate is used. Of course it doesn't matter.

In addition, the moisture-impermeable resin composition having self-adhesiveness, which fills the gap between the end portions of the spacer, has the following properties:
The sealing performance can be ensured by filling the material whose viscosity has been reduced by heating to a temperature of 00 ° C. or less.

Further, the spacer is constituted by at least two layers of the first spacer disposed inside and the second spacer disposed outside, because the spacer is disposed between the two layers or the second spacer. Further outside the spacer, if necessary, a film having a small gas permeability coefficient, for example, a plastic film such as polyethylene, polyethylene terephthalate, an aluminum foil, a metal foil such as a stainless steel foil and a laminated film obtained by laminating them, or a metal such as aluminum. A vapor-deposited plastic film may be provided.

[0057]

The present invention will be described below in detail with reference to examples. However, the present invention is not limited to the embodiment.

Embodiment 1 An embodiment of a double-glazing unit 1 according to the present invention is shown in FIG. The two glass sheets 2 and 3 are 5 mm thick
The one glass plate 3 is a low-emission glass plate in which a special metal film is coated on the hollow space side, and the vertical emissivity is 0.07.

The first spacer 4 has a hollow space layer of 6 mm.
Zeolite 3 having a particle diameter of 500 μm to 1 mm as a desiccant 6
A is filled with about 70 g / m 2, and a non-solvent type primary sealing material 7 containing polyisobutylene as a main component is applied 5 mm in width and 0.3 mm in thickness on one side on two outer surfaces to be adhered to glass. It was done.

On the other hand, the second spacer 8 has a thickness of 6 m.
m, a string-shaped curable resin layer having a width of 3 mm, comprising 5 wt% of an organic bentonite as a thixotropic agent, a flake diameter as a flake-like filler, an additional one-component heat-curable silicone rubber adhesive, Is about 27
0 m, a flake thickness of about 10 m, and an aspect ratio of about 27 filled with 40 wt% of mica 9. After kneading using a kneader, a thickness of 6 mm and a width of 3 using an extruder.
mm cross section is formed into a rectangular string shape, and the orientation of the mica 9 is almost parallel to each surface on all four surfaces near the surface of the string-like material, but the orientation is random at the center portion because the orientation is disturbed, It is prepared in a semi-cured state with an appropriate elastic modulus, can be deformed along the shape of glass, and can maintain almost the same shape even when bent at a corner.

The self-adhesive first spacer 4 filled with the desiccant and the second spacer 8 in a semi-cured state are attached to a predetermined position on the peripheral edge of one of the glass sheets 2 by a first spacer. 4 inside, the second in a semi-cured state
The spacer 8 is disposed outside.

Since the inner first spacer 4 has self-adhesiveness, it can be temporarily fixed. Thereby, as a manufacturing process, without applying the second spacer 8,
Since the sealing can be performed as a configuration corresponding to the dual seal method, the manufacturing process can be simplified.

After that, the other glass plate 3 is attached and pressure-bonded to be integrated with the adhesive. The double-glazed glass 1 thus obtained is introduced into a heating furnace (not shown) and heated at 125 ° C. for 10 minutes to harden the second spacer 8 in a semi-cured state, and at the same time, firmly adhere to the plate glasses 2 and 3. By bonding and integrating the first spacer 4 with the plate glasses 2 and 3 more strongly and adhesively, it is possible to obtain the double-glazed glass 1 in which the sealing portion is more firmly bonded.

The thus obtained 350 mm × 50 mm
The initial dew point of the 0 mm size double glazing 1
The initial dew point was measured to be -70 ° C or less and the JIS standard (below -35 ° C) was measured by the method specified in 3209-1995 and the initial heat transmission coefficient was measured by the method in accordance with JIS A 4710-1989. However, the initial heat transmission coefficient is 2.17 kcal / m ² h ° C, and the heat insulation performance is high. After the JIS accelerated durability test class III defined in JIS R3209-1995, the dew point is -70 ° C or less and the JIS standard ( -30 ° C or lower), the heat transmission coefficient is 2.17 kcal / m ² h ° C, and the heat insulation performance is high, and even after the test under severe conditions, the initial dew point and the heat transmission coefficient are almost unchanged and sufficient durability is maintained. It was confirmed that it had the property.

Further, in order to examine shear deformation in a case of being stored in a high temperature atmosphere such as in summer,
FIG. 4 shows the shear deformation test method. 35 prepared similarly
The double-sided glass 1 having a size of 0 mm × 500 mm has its short side horizontal and its long side inclined at an angle of 80 °. And the first spacer 4 and the second spacer 8 of the sealing part are floated in a free state, introduced into a heating furnace, and after 60 minutes at 40 ° C., the other glass 3 floating in the free state is sheared. When the amount of deformation was measured with a dial gauge 12 set on the upper side of the other glass 3,
0.0mm, which proved that the shear deformation resistance was excellent.

The hardness of the second spacer 8 is determined by JI
The SA hardness was 15 in a semi-cured state and 65 after curing. Embodiment 2 An embodiment of a double glazing 1 ′ according to the present invention is shown in a sectional view of a main part of FIG.

The two glass sheets 2 and 3 are float glass sheets having a thickness of 5 mm, and the other glass sheet 3 is a low-emission glass sheet having a hollow space coated with a special metal film, and has a vertical emissivity of 0.07.

The first spacer 4 is the same as that of the first embodiment and comprises an aluminum spacer 5 for a hollow space layer of 6 mm, and has a particle diameter of 500 μm to 1 m as a desiccant 6 in the hollow portion.
m of zeolite powder 3A of about 70 g / m ² , and a non-solvent type primary sealing material 7 containing polyisobutylene as a main component and having a width of 5 mm per side on two outer surfaces to be adhered to glass, The coating was 0.3 mm thick.

On the other hand, the second spacer 8 'has a thickness of 6 m.
m, a string-shaped curable resin layer having a width of 3 mm. An additional one-component heat-curable silicone rubber adhesive, 5 wt% of organic bentonite as a thixotropic agent, and mica 9 as a flake-like filler. 'To 40w
Unlike Example 1, the kneader was used to control the orientation of mica 9 ′ having a flake diameter of about 690 μm, a flake thickness of about 10 μm, and an aspect ratio of about 69, unlike Example 1. After kneading, the width was slightly reduced from 6 mm using an extruder and the thickness was reduced to about 2 mm.
When molded into a film having a thickness of 00 μm, the mica 9 ′ is oriented in the direction parallel to the film surface, and 16 films obtained by the same method are laminated and lightly pressed to make the orientation of the mica 9 ′ substantially parallel. 6 controlled width
A 3 mm-thick, 3 mm-thick rectangular string is obtained, and when it is rotated by 90 °, a 6 mm-thick, 3 mm-wide cross-section becomes a rectangular string, and the orientation of the mica 9 ′ is a glass surface. It is prepared in a semi-cured state with an appropriate elastic modulus, controlled almost vertically, and can be deformed so as to conform to the shape of glass, and retains almost the same shape even when bent at corners Can be done.

The first spacer 4 filled with the drying agent and having self-adhesiveness and the second spacer 8 ′ in a semi-cured state are attached to the first glass plate 2 at a predetermined position on the peripheral edge thereof by the first spacer. The spacer 4 is disposed inside and the second spacer 8 ′ in a semi-cured state is disposed outside.

Since the inner first spacer 4 has self-adhesiveness, it can be temporarily fixed. Accordingly, in the manufacturing process, the second spacer 8 'can be sealed without applying the second spacer 8' as a configuration corresponding to the dual seal method, so that the manufacturing process can be simplified.

After that, the other glass plate 3 is attached and pressure-bonded to be integrated by adhesion. The double-glazed glass 1 ′ thus obtained is introduced into a heating furnace (not shown) and heated at 125 ° C. for 10 minutes to harden the second spacer 8 ′ in a semi-cured state, and at the same time, simultaneously with the glass sheets 2 and 3, By firmly bonding and integrating, and the first spacer 4 being more strongly adhesively integrated with the plate glasses 2 and 3, it is possible to obtain a double-glazed glass 1 'in which the sealing portion is more firmly bonded.

The thus obtained 350 mm × 50
The initial dew point of the 0 mm sized double glazing 1 'is -70 ° C or less and clears the JIS standard (-35 ° C or less), the initial heat transmission coefficient is 2.17 kcal / m2 h ° C, and the insulation performance is high, and the JIS accelerated durability Dew point is -70 after sex test III
° C or less, clears the JIS standard (-30 ° C or less), has a heat transfer coefficient of 2.17 kcal / m ² h ° C, has high heat insulation performance, and has an almost initial dew point even after testing under severe conditions. It was confirmed that there was no decrease in the heat transmission coefficient and that it had sufficient durability.

Further, even after repeating three cycles up to the JIS accelerated durability test III, the dew point is -70 ° C. or less, and the heat transmission coefficient is 2.17 kcal / m ² h ° C.
It was confirmed that there was almost no decrease in the initial dew point and the heat transmission coefficient, and that it had sufficient durability.

Further, a 350 mm × 500 manufactured similarly.
When the amount of shear deformation of the multi-layer glass 1 ′ having a size of mm was measured, it was found to be 0.0 mm, indicating that the shear deformation resistance was excellent.

The hardness of the second spacer 8 ′ is J
The ISA hardness was 15 in a semi-cured state and 65 after curing. Example 3 Except that the second spacer was an addition-type one-component heat-curable silicone rubber adhesive alone and was not filled with organic bentonite as a thixotropic agent and mica as a flake-like filler. The initial dew point of a 350 mm × 500 mm double glazing obtained by the same method as in Example 1 was −70 ° C. or less, and the JIS standard (−35)
° C or less), and the initial heat transmission coefficient is 2.17 kcal.
/ M ² h ° C and high heat insulation performance. After JIS accelerated durability test class III, the dew point became -70 ° C or less, meeting the JIS standard (-30 ° C or less), and the heat transmission rate was 2.17 k.
cal / m ² h ° C, it was confirmed that the insulation performance was high, and even after the test under severe conditions, the initial dew point and the heat transmission coefficient were hardly reduced, and sufficient durability was confirmed. Further JI
After the S accelerated durability test class III, the dew point is -70 ° C or less, and the heat transmission coefficient is 2.17 kcal / m ² h ° C. It was confirmed that it had.

Also, a 350 mm × 500 manufactured similarly.
When the amount of shear deformation of the multi-layer glass of mm size was measured, it was 0.0 mm, indicating that the shear deformation resistance was excellent.

The hardness of the second spacer is determined according to JIS.
The A hardness was 12 in a semi-cured state and 60 after curing.

[0079]

Comparative Example 1 A comparative example of the double glazing 1 ″ is shown in FIG. The two glass sheets 2 and 3 are float glass sheets having a thickness of 5 mm, and the other glass sheet 3 is a low-emission glass sheet in which a special metal film is coated on the hollow space side, and has a vertical emissivity of 0.07.

The spacer 4 ″ has a thickness of 6 mm and a width of 10 m.
A self-adhesive cross section filled with a drying agent of m was formed into a rectangular string shape, and was disposed at the peripheral edge of the sheet glass.

The spacer 4 ″ is a hot-melt butyl containing polyisobutylene as a main component and 30% by weight of zeolite 3A having a particle diameter of 100 μm or less filled therein. The mixture is kneaded using a closed kneader and then extruded. It is formed into a string with a rectangular cross section of 6 mm in thickness and 10 mm in width, and has sufficient self-adhesiveness that it can be temporarily fixed to the peripheral edge of the sheet glass, and can be deformed along the shape of the glass. In addition, even when bent at a corner portion, the shape can be maintained almost as it is.

The spacer 4 ″ is provided at a predetermined position on the peripheral edge of one of the glass sheets 2 using a positioning jig. As a result, the manufacturing process can be sealed as a so-called single seal system, so that the manufacturing process can be simplified.

After that, the other glass plate 3 is attached and pressure-bonded to be integrated with the adhesive. The double-glazed glass 1 ″ thus obtained is introduced into a heating furnace (not shown) and heated at 125 ° C. for 10 minutes to be more strongly adhered and integrated with the plate glasses 2 and 3 to obtain the double-glazed glass 1. it can.

The thus obtained 350 mm × 50
The initial dew point of the double glazing 1 ″ having a size of 0 mm is −45 ° C. and clears the JIS standard (−35 ° C. or less). The initial heat transmission coefficient is 2.17 kcal / m ² h ° C. and the heat insulating performance is high. After accelerated durability test III, dew point is -70 °
C and below JIS standard (-30 ° C or less), heat transfer coefficient is 2.17 kcal / m ² h ° C, high heat insulation performance, and almost initial dew point and heat flow even after testing under severe conditions It was confirmed that there was no decrease in the rate and that the sample had sufficient durability.

However, a 350 mm.times.50
When the amount of shear deformation of the double glazing 1 ″ having a size of 0 mm was measured, it was 1.5 mm, and it was found that the shear deformation resistance was extremely inferior to that of the present invention.

[0086]

As described in detail above, according to the present invention,
In addition to the conventional feature of high mechanical strength when using a metal spacer, the manufacturing process can be simplified, and high sealing reliability can be achieved.
Therefore, the manufacturing cost can be reduced.

Further, since the secondary sealing material is provided in the form of a string in advance, there is no problem that the workability is reduced due to dripping or the product yield is reduced due to dirt on the plate glass. This does not cause the entire production line to stop.

Further, the dew point performance and the heat insulation performance are excellent, and the durability can be maintained for a long time. Even when stored in a high temperature atmosphere such as in summer, shear deformation occurs. It is possible to obtain excellent shear deformation resistance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main part of a double glazing 1 according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a principal part showing Example 2 of a double glazing 1 ′ according to the present invention.

FIG. 3 is a cross-sectional view of a main part showing Comparative Example 1 of the double glazing 1 ″.

FIG. 4 is a side sectional view showing a shear deformation test method for a double-glazed glass.

[Explanation of symbols]

 1, 1 ', 1' 'double-glazed glass 2 flat glass 3 flat glass (low radiation glass) 4, 4' 'first spacer 5 aluminum spacer 6 desiccant 7 primary sealing material 8 second spacer 9 flake-like filling Lumber mica 10 Support stand 11 Weight 12 Dial gauge

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiromi Hase 1510 Oguchicho, Matsusaka-shi, Mie Pref.

Claims (6)

[Claims] 1. A double-layered glass having a sealed hollow space formed by arranging two sheet glasses at a predetermined interval and arranging a spacer for maintaining the interval at a peripheral edge of the panel. In the above, the spacer is a moisture-impermeable resin having a self-adhesive property in a portion where the hollow portion of the metal cylindrical hollow body is filled with a desiccant, and which is adhesively bonded to glass on the outer surface of the metal cylindrical hollow body. It is composed of at least two layers of a first spacer coated with the composition and a second spacer composed of a string-like curable resin layer, and the first spacer is provided on the inside,
A double glazing characterized in that each spacer is disposed with the second spacer facing outward. 2. The method according to claim 1, wherein the second spacer is a curable resin such as a polysulfide type, a silicone type, a polyurethane type, an epoxy type, or an unsaturated polyester type, or an epoxy urethane type, an epoxy silicone type, an epoxy polysulfide type, or the like. Mixed or interpenetrating polymer network (IPN: Interpenetrati)
2. The double-glazed glass according to claim 1, comprising one of curable resins obtained by a method such as ng Polymer Network. 3. The method according to claim 2, wherein the second or uncured or semi-cured
3. The double-glazed glass according to claim 1, wherein the spacer is a one-component type using a latent curing agent method or a self-curing method. 4. The double glazing according to claim 1, wherein the second spacer is filled with a flake-like filler. 5. The double spacer according to claim 4, wherein the second spacer is filled with a flake-like filler, and the orientation of the flake-like filler is controlled substantially perpendicular to the surface of the glass sheet. Layer glass. 6. A double glazing in which a sealed hollow space is formed by arranging two plate glasses at a predetermined interval and arranging a spacer for maintaining the interval at a peripheral edge of the panel. In the method for producing, the spacer is:
Moisture-impermeable resin composition in which a hollow part of a metal cylindrical hollow body is filled with a desiccant, and which has self-adhesiveness at a portion adhesively bonded to glass on an outer surface of the metal cylindrical hollow body. And a second spacer composed of a deformable curable resin layer obtained by molding into a string in an uncured or semi-cured state, the first spacer comprising: And the second spacer, with the first spacer being on the inside, and affixing it to the peripheral edge of one of the glass sheets or slightly inside thereof, and then bonding and bonding the other glass sheet on the other glass plate and pressure-bonding to integrate them. Thereafter, the second spacer in an uncured or semi-cured state is cured so that the second spacer is simultaneously firmly bonded and integrated with the sheet glass.