JP2850975B2 - Double glazing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of laminating a plurality of glass sheets around the entire circumference thereof with a spacer interposed therebetween in a thickness direction, and forming a first sealing layer between the glass sheet and the spacer. The present invention relates to a double glazing in which a second sealing layer is interposed between the plurality of glass sheets and adjacent to an outer side of the first sealing layer between the plurality of glass sheets to form a sealed space between the plurality of glass sheets.

[0002]

2. Description of the Related Art Usually, as this kind of double-glazing, a first sealing layer is formed of butyl rubber, and a second sealing layer is formed of a non-foamable flame-retardant sealing material. Layers are used to prevent the sealed space between the glass sheets from moisture, and the second seal layer is used to obtain a large adhesive force between the glass sheets.

[0003]

However, according to the above-mentioned conventional double glazing, on one side of the double glazing,
Since a flammable gas is generated from the butyl rubber when heated to a high temperature due to a fire or the like, the flammable gas leaks from the sheet glass broken by the high heat on the other side of the fire occurrence side. It ignites in contact with fresh air, and from the ignited flame, it may spread to the space on the other side or spread to the seal layer and cause fire to spread, so that higher fire protection performance is achieved. Was desired.

[0004] Accordingly, it is an object of the present invention to provide a double-glazed glass exhibiting high fire protection performance while maintaining the conventional moisture resistance in view of the above-mentioned drawbacks.

[0005]

A feature of the present invention to achieve this object is that the second seal layer is formed of a foamable flame-retardant sealing material which foams by receiving heat. Covering the edge side outer surface of the plate glass, a radiant heat shielding portion for blocking radiant heat from being incident on the first seal layer is at least as wide as the first seal layer, and is formed over the entire circumference of the plate glass. Preferably, the spacer may be provided with a flat portion having a shape along the surface of the plate glass, and it is preferable that the first seal layer is formed of butyl rubber.

[0006]

[Operation] In other words, as a result of the experiment, if the second seal layer is formed from a foamable flame-retardant sealing material that foams by receiving heat,
When the sealing layer of the multi-layer glass is exposed to high heat, the foamable flame-retardant sealing material foams and expands, and passes through the first seal layer and escapes to the closed space side. New findings have been obtained that the sealing material covers the first seal layer, suppresses the generation of flammable gas from the first seal layer, and prevents the flame from igniting in the first seal layer.

That is, an example of an experiment in which the first seal layer is made of butyl rubber will be described with reference to FIG. 3. In a situation where the edge of the double-layer glass is first exposed to a high temperature due to heat such as fire, As the butyl rubber 4 softens, the foamable flame-retardant sealing material 5 foams and expands. At this time, since the foamable flame-retardant sealing material 5 is in a state where it is restricted from expanding toward the window frame, the foaming flame-retardant sealing material 5 penetrates the butyl rubber 4 and escapes to the closed space A side. At this time, since the butyl rubber 4 is in a state of being softened and easily broken, the foamable flame-retardant sealing material 5 is closed with the butyl rubber 4 remaining between the spacer 3 and the glass sheets 1 and 2. It is considered that the butyl rubber 4 escapes to the space A side, and the butyl rubber 4 is covered.

The phenomenon of softening when heated is common to sealing materials as well as butyl rubber, and thus the above-mentioned situation is generally considered to occur.

[0009]

As described above, since the second seal layer expands and expands to cover the first seal layer, generation of combustible gas from the butyl rubber can be suppressed, and the other side of the double-glazed glass can be prevented. It can be prevented that the fire spreads on the side of the space or spreads on the seal layer to cause a fire to spread. A radiant heat shield that covers the edge side outer surface of the plate glass and blocks radiant heat from being incident on the first seal layer has a width covering at least the first seal layer and is formed over the entire circumference of the plate glass. In addition, the first seal layer is less likely to be heated, so that flammable gas is less likely to be generated from the first seal layer, and it is possible to suppress fire from spreading. Also, if a situation occurs in which the spacer is deformed by heating,
Since the first seal layer is between the glass sheet and the spacer, it may be extruded into the closed space,
If the spacer is provided with a flat portion having a shape along the surface of the plate glass, the spacer is unlikely to be deformed by heat, and the first seal layer is prevented from being pushed out to the closed space side due to the deformation. it can. In addition, if the first seal layer is formed of butyl rubber, a high moisture-proof property is obtained in the closed space at normal times, and a high-quality double-layer glass is obtained.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the double glazing of the present invention comprises:
The plate glass 1 and the netted glass 2 having high fire protection performance are arranged in parallel via a spacer 3, and a first sealing material 4 made of butyl rubber is interposed between the spacer 3 and the plate glass 1 and the netted glass 2. At the same time, between the plate glass 1 and the meshed glass 2, a second sealing material 5 made of a foamable flame-retardant sealing material is interposed outside the first sealing material 4 to form the sheet glass 1 and the meshed glass 2. A double-layer glass is formed by forming a closed space A therebetween, and an end surface supporting portion 6a and a side surface portion 6b are sandwiched between the plate glass and the meshed glass 2 on the edge side thereof. A radiant heat shielding portion for suppressing heating of the first seal layer is formed by attaching the steel adapter 6 provided with the side portion 6b, and is fitted and fixed as a whole to a sash frame 7 built on a structure. And Aru.

The spacer 3 is made of aluminum, is formed in a ring shape over the entire periphery of the peripheral edge of the sheet glass 1, and has a U-shaped opening having an opening on the closed space A side in a sectional view.
Flat part 3 facing sheet glass 1 and netted glass 2 in a letter shape
a is formed, and a desiccant chamber 9 is provided on the inner side of the bent portion, and the desiccant is enclosed to enhance the moisture-proof effect in the closed space A. In addition, if the side surface of the closed space A of the desiccant chamber 9 is provided so as to be retracted from the upper end of the flat portion 3a, it is difficult to receive radiant heat. It is possible to prevent the first sealing material 1 from being pushed out to the closed space A side due to the deformation.

The foamable flame-retardant sealing material is a silicone sealing material (for example, sealant X31-1037 manufactured by Shin-Etsu Chemical Co., Ltd.) containing a foaming filler such as aluminum hydroxide and calcium carbonate. In a softened state, foaming occurs (approximately 150 ° C. to 180 ° C.) before a flammable gas starts to be generated. If this foamable flame-retardant sealing material is used, it expands and the first butyl rubber material This is preferable because it easily moves through the sealing material to the closed space A side (see FIG. 3).

[Another embodiment] Another embodiment will be described below.
As shown in FIG. 4, an O-shaped spacer 3 having a constriction 3b formed on the surface of the plate glass 1 and the netted glass 2.
May be used to form a double glazing. With such a configuration, it is easy to reliably hold the first sealing material 4 in the constriction 3b, and when the second sealing material expands and expands, the first sealing material 4 becomes the second sealing material. To be moved into the closed space A.

In the above embodiment, the sheet glass 1 and the netted glass 2 are used, but heat-strengthened glass may be used as the sheet glass 1. With this configuration, the double-glazed glass is heated by the fire on the sheet glass 1 in addition to the high fire protection performance of the netted glass against the fire on the glass-enclosed glass 2 side. However, even if the heat-strengthened glass is not broken, the flame can be blocked, and a higher fire protection performance can be obtained.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a double glazing of the present invention.

FIG. 2 is an explanatory view of mounting the double-glazed glass of the present invention.

FIG. 3 is an explanatory view of an operation in which a second sealing material moves.

FIG. 4 is a cross-sectional view of a main part of a double glazing according to another embodiment.

[Explanation of symbols]

 1 and 2 sheet glass 3 spacer 4 first seal layer 5 second seal layer A closed space 6b radiant heat shielding part 3a flat part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) C03C 27/06 101 E06B 3/66 E06B 5/16

Claims (4)

(57) [Claims] 1. A plurality of glass sheets (1) and (2) are laminated over the entire circumference thereof at intervals in the thickness direction via a spacer (3), and are laminated with the glass sheets (1) and (2). A first seal layer (4) is interposed between the spacers (3) and adjacent to an outer side of the first seal layer (4) between the plurality of glass sheets (1) and (2). A plurality of glass sheets (1), (2) with a second sealing layer (5) interposed
A double-glazed glass having a closed space (A) formed therebetween, wherein the second sealing layer (5) is formed of a foamable flame-retardant sealing material which foams by receiving heat. 2. A radiant heat shield (6b) that covers an outer surface on the edge side of the plate glasses (1) and (2) and blocks radiant heat from entering the first seal layer (4). The glass plate (1),
The double glazing according to claim 1, which is formed over the entire circumference of (2). 3. The double-glazed glass according to claim 1, wherein the spacer (3) is provided with a flat portion (3a) having a shape along the surface of the glass sheets (1) and (2). . 4. The double glazing according to claim 1, wherein the first sealing layer (4) is formed from butyl rubber.