Multilayer glass for building

Abstract

To provide a multilayer glass for building having high durability.SOLUTION: A multilayer glass for building 100 includes two or more glass plates 1, 2, 3 disposed in opposition; first sealing members 6, 7 arranged at the outer edges of the respective glass plates 1, 2, 3 to form hollow layers 4, 5 in which gas is sealed; and a second sealing member 8 provided outward of the first sealing members 6, 7 at the outer edges of the hollow layers 4, 5, the first sealing members 6, 7 being composed of one material having gas barrier property and resistance to wind pressure.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to double-glazing for buildings. [Background technology]

[0002] In the past, double-glazing with improved thermal insulation performance has been developed to realize ZEH (Net Zero Energy House) and ZEB (Net Zero Energy Building). In such double-glazing, the thermal insulation performance has been improved by reducing the pressure in the cavity between the opposing glass panes to a vacuum level or by filling the cavity with an inert gas (see, for example, Patent Document 1).

[0003] Patent Document 1 describes a double-glazed glass unit that includes a plurality of glass plates arranged opposite each other, a first sealing material (spacer) that forms a hollow layer filled with gas between the opposing glass plates, and a second sealing material (hollow layer sealing material) that is provided on the outer periphery of the first sealing material. The first sealing material is made of aluminum or the like and formed into a predetermined shape, and sealants that prevent moisture from penetrating into the hollow layer are provided between the glass plates and both ends of the first sealing material. The second sealing material is adhered to the glass plates and secures the opposing glass plates together. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-55736 Summary of the Invention [Problem to be solved by the invention]

[0005] The wind pressure resistance of double-glazed glass must exceed the wind load acting on the glass surface. Since the higher the building, the greater the wind load acting on the glass surface. Double-glazed glass installed in high-rise buildings and the like must therefore have higher wind pressure resistance than double-glazed glass for residential buildings.

[0006] When double-glazed glass is subjected to wind loads, or when the gas filling the cavity expands or contracts due to changes in air pressure or temperature, the glass panes bend and deform, generating tensile and compressive stresses in the first and second sealing materials that secure the four edges of the glass panes. If the first and second sealing materials are repeatedly subjected to such stresses and break, the gas filling the cavity may leak, or the glass panes may become unstable. Compared to residential double-glazed glass, repairs cannot be carried out in a shorter time span, and once installed, they cannot be replaced, so a long durability of 30 years or more is required.

[0007] In the double-glazing glass described in Patent Document 1, a sealant enhances adhesion between the glass panes and the first sealing material (spacer). However, because the first sealing material is formed into a predetermined shape, dimensional changes between the glass panes caused by wind loads and other factors must be absorbed by the sealant, which is prone to repeated stress. As a result, deterioration of the sealant easily leads to a loss of adhesion between the glass panes and the first sealing material. Furthermore, although resins such as polysulfide used as the second sealing material have gas barrier properties and bond the glass panes together, they swell when exposed to moisture, resulting in a short lifespan of approximately 20 years. For this reason, when the double-glazing glass described in Patent Document 1 is used in high-rise buildings and other buildings, there are problems such as damage to the sealant or second sealing material due to deformation of the glass panes during use, resulting in unstable fixation of the glass panes, or loss of gas barrier properties, which can lead to leakage of gas filled in the cavity.

[0008] Therefore, there is a demand for highly durable double-glazing glass for buildings. [Means for solving the problem]

[0009] The double-glazing glass for buildings according to the present invention is characterized by comprising two or more glass sheets arranged opposite each other, a first sealing material arranged on the outer edge of each of the glass sheets to form a hollow layer filled with gas, and a second sealing material arranged outside the first sealing material at the outer edge of the hollow layer, wherein the first sealing material is made of a single material that has gas barrier properties and wind pressure resistance.

[0010] According to this configuration, since the first sealing material has gas barrier properties, the second sealing material does not need to have gas barrier properties. Therefore, a highly durable material other than a material with gas barrier properties can be selected as the second sealing material. Furthermore, the first sealing material has wind pressure resistance. Wind pressure resistance refers to the ability of the first sealing material to repeatedly deform while in close contact with the glass panes in response to changes in shape of the glass panes due to wind loads and other factors. This allows the first sealing material alone to absorb dimensional changes between the glass panes due to deflection of the glass panes caused by wind loads or gas expansion or contraction, thereby maintaining close contact between the glass panes and the first sealing material. Therefore, double-glazing glass having the first sealing material can be used in double-glazing glass for buildings, which require high wind pressure resistance. Furthermore, compared to using a spacer as the first sealing material, a sealant between the first sealing material and the glass panes is not required. Because sealants are easily damaged by deformation, the use of the first sealing material according to this configuration improves the durability of double-glazing glass for buildings. Furthermore, since the number of parts required for double-glazing glass for buildings can be reduced, it is possible to make the glass lighter and shorten the manufacturing process.

[0011] Another characteristic feature is that the first sealing material has a water vapor permeability coefficient of 0.2E-12 (mol m) / (m 2 ·s·Pa) or less.

[0012] This configuration can prevent water vapor from passing through the hollow layer from the outside air, which makes it possible to prevent condensation and other issues from occurring within the hollow layer even when double-glazed glass is used for long periods in harsh environments such as high-rise buildings.

[0013] Another characteristic feature is that the first sealing material has a resilience coefficient of 3% or more and 40% or less.

[0014] According to this configuration, even if the gas filling the hollow layer contracts or expands due to changes in wind load, air pressure, temperature, etc., and compressive or tensile stress acts on the first sealing material from the glass sheet, the first sealing material can effectively absorb that stress. As a result, the glass sheet and the first sealing material can be maintained in close contact with each other, damage to the first sealing material can be reduced, and the durability of the double glazing for buildings can be improved.

[0015] Another characteristic feature is that the first sealing material contains a polyisobutylene resin.

[0016] Polyisobutylene-based resins consist of isobutylene polymers and other molecular structures. Because isobutylene polymers have two methyl groups in their side chains, molecular motion of the main chain is suppressed by steric hindrance. As a result, polyisobutylene-based resins have high internal friction and low rebound resilience. Therefore, with this configuration, even if stress due to the expansion or contraction of the gas filled in the hollow layer occurs in the first sealing material, the first sealing material can absorb this stress, making it less likely to break, and improving the durability of double-glazed glass for buildings. Furthermore, because polyisobutylene-based resins have high internal friction, they have high gas barrier properties. Therefore, with this configuration, gas inflow and outflow from the hollow layer can be suppressed, preventing gas leakage from the hollow layer and internal condensation.

[0017] Another characteristic feature is that the first sealing material is polyisobutylene.

[0018] Polyisobutylene is composed only of isobutylene polymers. Therefore, compared to polyisobutylene-based resins, it has lower impact resilience and excellent gas barrier properties. According to this configuration, by using polyisobutylene, which has low impact resilience and high gas barrier properties, as the first sealing material, the durability of double-glazing can be improved. In particular, even if stress is repeatedly generated in the first sealing material due to long-term use of double-glazing, the first sealing material is less likely to deteriorate or be damaged, so gas barrier properties are not lost. Furthermore, because polyisobutylene does not absorb moisture, it does not swell due to humidity, making it possible to improve the durability of double-glazing.

[0019] Another characteristic feature is that the first sealing material includes butyl rubber.

[0020] Butyl rubber is a copolymer made of isobutylene and a small amount of isoprene. Because butyl rubber has two methyl groups in its side chains, steric hindrance suppresses molecular motion in the main chain. This gives butyl rubber high gas barrier properties and low impact resilience. Therefore, this structure can improve the durability of double-glazed glass.

[0021] Another characteristic feature is that a desiccant having an average particle size of 50 μm or less is dispersed in the first sealing material.

[0022] According to this configuration, the desiccant absorbs moisture contained in the hollow layer and moisture that has penetrated from the outside air through the second sealing material, so that condensation or fogging does not occur on the glass plate forming the hollow layer, thereby preventing a decrease in visibility. Furthermore, because the average particle diameter of the desiccant is 50 μm or less, the desiccant is dispersed in the material without agglomerating, so the desiccant has little effect on the material and does not deteriorate the physical properties of the first sealing material.

[0023] Another feature is that the surface area of ​​the glass plate is 3 m 2 That's all there is to it.

[0024] According to this configuration, it is possible to install highly durable double-glazed glass for buildings even when the surface area of ​​the glass plate is large, such as when it is desired to increase lighting or improve the design of a building.

[0025] Another characteristic feature is that the gas contains Ar or Kr.

[0026] According to this configuration, the hollow layer can be filled with Ar or Kr, which has a lower thermal conductivity than air, thereby reducing the heat transmission coefficient and improving the thermal insulation performance of the double glazing for buildings.

[0027] Another characteristic feature is that the width of the hollow layer is 5 mm or more and 16 mm or less.

[0028] If the width of the hollow layer is 5 mm or less, it is difficult to ensure a sufficient insulating space. Furthermore, if the width of the hollow layer is 16 mm or more, gas convection occurs, reducing the insulating properties. Therefore, with this configuration, a sufficient insulating space can be ensured and gas convection can be suppressed, thereby reliably reducing the thermal transmittance.

[0029] Another characteristic configuration is that the two or more glass plates include a first glass plate on the outdoor side, a second glass plate arranged opposite the first glass plate, and a third glass plate arranged opposite the second glass plate, and the hollow layer includes a first hollow layer formed between the first glass plate and the second glass plate, and a second hollow layer formed between the second glass plate and the third glass plate.

[0030] The thermal transmittance of double-glazing glass with four or more glass plates is equivalent to that of double-glazing glass with three glass plates. Therefore, according to this configuration, by using three glass plates, the thermal transmittance can be reduced with the simplest configuration, and the insulating performance of the double-glazing glass can be improved. This makes it possible to reduce the weight of the double-glazing glass and efficiently form double-glazing glass for buildings.

[0031] Another characteristic feature is that the thickness of the second glass plate is 2 mm or more and 20 mm or less.

[0032] According to this configuration, the thickness of the second glass plate, which is less susceptible to the effects of wind pressure resistance and heat insulation performance, is set to 2 mm or more and 20 mm or less, thereby making it possible to reduce the weight of the double glazing for buildings.

[0033] Another characteristic feature is that the height of the second sealing material along the surface of the glass plate is 4 mm or more and 20 mm or less.

[0034] The strength required for the second sealing material varies depending on the location, height, and region of the building where the double-glazing is installed. Therefore, according to this configuration, by setting the height of the second sealing material to 4 mm or more and 20 mm or less, the strength of the second sealing material can be adjusted to match the strength required for each installation location. Furthermore, by setting the height of the second sealing material to 4 mm or more, gas leakage from the cavity layer can be reduced, thereby improving the durability of the double-glazing for buildings.

[0035] Another characteristic configuration is that the height of the first sealing material along the plate surface is 4 mm or more and 10 mm or less, and the height of the second sealing material along the plate surface is equal to or greater than the height of the first sealing material.

[0036] The strength required for the first sealing material varies depending on the location and height of the building where the double-glazing glass is installed, the region, etc. Therefore, according to this configuration, by setting the height of the first sealing material to 4 mm or more and 10 mm or less, the strength of the first sealing material can be adjusted to meet the required strength. Furthermore, by setting the height of the second sealing material along the surface of the glass plate to be equal to or greater than the height of the first sealing material, the durability of the second sealing material can be improved, and the wind load resistance and thermal insulation properties of the double-glazing glass for buildings can be maintained for a long period of time.

[0037] Another characteristic feature is that the outer end surface of the second glass plate is covered with the second sealing material.

[0038] When the outer edge surface of the second glass pane is covered with a first sealing material, deformation of the first sealing material due to wind load or gas expansion or contraction easily causes the second glass pane to displace toward the first or third glass pane. If the second glass pane displaces and peels off from the first sealing material, the airtightness of the cavity cannot be maintained, increasing the heat transmittance of the double-glazing glass for buildings and hindering its long service life. Therefore, with this configuration, even if repeated stress is applied to the first sealing material due to wind load or gas expansion or contraction, the second sealing material secures the outer edge surface of the second glass pane, making it less likely to displace, thereby improving the durability of the double-glazing glass for buildings. Gas leakage due to displacement of the second glass pane can also be suppressed. Furthermore, when the outer edge surface of the second glass pane is covered with a second sealing material, external forces are less likely to be transmitted to the second glass pane during installation of the double-glazing glass for buildings. This prevents breakage of the second glass plate, improving the durability and handling properties of the double glazing for buildings.

[0039] Other features include a thermal conductivity of 1.0W / (m 2 ·K) or less.

[0040] This configuration makes it possible to improve the thermal insulation performance of double-glazing for buildings and achieve ZEB.

[0041] Another characteristic feature is that the second glass plate has a through-hole formed therein, which allows the first hollow layer and the second hollow layer to communicate with each other.

[0042] The second glass pane separating the two hollow layers is subjected to stress from both the first and second hollow layers, but by providing a through hole in the second glass pane as in this configuration, these stresses are offset, making the second glass pane less likely to deform. Furthermore, if the stress acting on the first or third glass pane exceeds a certain value, the double-glazing glass may break. Therefore, by providing a through hole in the second glass pane as in this configuration, the temperature and pressure of the first and second hollow layers can be equalized, thereby suppressing deformation of the first and third glass panes and preventing breakage of the double-glazing glass for buildings.

[0043] Another characteristic feature is that a Low-E film is formed on a surface of the first glass plate facing the second glass plate or on a surface of the third glass plate facing the second glass plate.

[0044] This configuration can suppress radiant heat transfer between the first and second glass panes that are exposed to the outside air, or between the second glass pane and the third glass pane located on the indoor side, thereby reducing the overall heat transmittance of the double glazing for buildings and improving the thermal insulation of the double glazing for buildings.

[0045] Another characteristic feature is that the second glass plate is made of tempered glass.

[0046] According to this configuration, by using tempered glass, which can be made thinner than an untempered glass plate, for the second glass plate, it is possible to reduce the weight of the double glazing. Furthermore, tempered glass has a curve (edge ​​lift) at the outer edge during the manufacturing process, and if this edge lift is covered by the first sealing material, it is possible to tightly attach the second glass plate and the first sealing material.

[0047] Another characteristic feature is that the first glass plate is a laminated glass, and the third glass plate is a single glass plate.

[0048] According to this configuration, the first glass sheet is durable and therefore less likely to break, and even if the laminated glass breaks, glass fragments are less likely to scatter, making it possible to use it as security glass or disaster prevention glass. Furthermore, by using a single-pane glass for the third glass sheet, it is possible to reduce the overall weight of the double-glazing glass for buildings. [Brief explanation of the drawings]

[0049] [Figure 1] 1 is a cross-sectional view of a double-glazing panel according to a first embodiment. [Figure 2] FIG. 2 is a view taken along the line II-II in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0050] Hereinafter, embodiments of the double-glazing glass for buildings according to the present invention will be described with reference to the drawings. Note that the embodiments described below are merely examples for explaining the present invention, and the present invention is not limited to these embodiments. Therefore, the present invention can be implemented in various forms without departing from the gist of the present invention.

[0051] As shown in Figure 1, a double-glazing glass panel 100 for a building comprises a first glass pane 1, a second glass pane 2, and a third glass pane 3. The first glass pane 1 and the second glass pane 2, and the second glass pane 2 and the third glass pane 3 are arranged to face each other, with a second surface 12, which is the surface of the first glass pane 1, facing a third surface 13, which is the surface of the second glass pane 2, and a fourth surface 14, which is the surface of the second glass pane 2, facing a fifth surface 15, which is the surface of the third glass pane 3. In this embodiment, the first surface 11 of the first glass pane 1 faces the exterior side of the room, and the sixth surface 16 of the third glass pane 3 faces the interior side of the room.

[0052] Between the first glass plate 1 and the second glass plate 2, a first sealing material 6 is disposed on the outer edge of each of the glass plates 1 and 2, connecting the first glass plate 1 and the second glass plate 2 together. Similarly, between the second glass plate 2 and the third glass plate 3, a first sealing material 7 is disposed on the outer edge of each of the glass plates 2 and 3, connecting the second glass plate 2 and the third glass plate 3 together. A second sealing material 8 is disposed on the outer edge of each of the glass plates 1, 2, and 3, outside the first sealing materials 6 and 7, connecting the first glass plate 1, the second glass plate 2, and the third glass plate 3 together.

[0053] A first hollow layer 4 is formed between the first glass plate 1 and the second glass plate 2 by a first sealing material 6. Similarly, a second hollow layer 5 is formed between the second glass plate 2 and the third glass plate 3 by a first sealing material 7. The first hollow layer 4 and the second hollow layer 5 are sealed by the first sealing materials 6 and 7, respectively. In this way, the double glazing glass 100 for buildings in this embodiment has three glass plates 1, 2, and 3 and first sealing materials 6 and 7, and thereby has two hollow layers inside.

[0054] The first hollow layer 4 and the second hollow layer 5 are preferably filled with Ar, Kr, or the like. These have lower thermal conductivity than dry air, which can suppress heat transfer between indoors and outdoors and reduce the overall heat transmittance of the double-glazing glass for buildings 100. This improves the thermal insulation of the double-glazing glass for buildings 100, enabling it to become a ZEB. The width of the first hollow layer 4 (the distance between the second surface 12 and the third surface 13) and the width of the second hollow layer 5 (the distance between the fourth surface 14 and the fifth surface 15) are preferably 5 mm or more and 16 mm or less. If these widths are 5 mm or less, a sufficient insulating space cannot be secured, and if these widths are 16 mm or more, convection of gases such as Ar and Kr occurs, reducing the insulating properties.

[0055] The widths (lengths perpendicular to the plate surface) of the first hollow layer 4 and the second hollow layer 5 may be different or equal. This allows the double-glazing glass 100 for buildings to be formed symmetrically, thereby simplifying the manufacturing process. If the widths of the first hollow layer 4 and the second hollow layer 5 are different, it is preferable to make the width of the first hollow layer 4 longer. This is because, since wind loads act mainly on the first glass plate 1, the longer the first sealing material 6 that forms the first hollow layer 4, the more flexibly it deforms and the longer it is possible to maintain wind pressure resistance for a longer period of time.

[0056] The double-glazed glass for buildings 100 of the present invention can be used in buildings, such as buildings 13 meters or higher. The higher the building, the greater the wind load acting on the glass surface. The magnitude of the wind load acting on the glass surface also varies depending on the location of the double-glazed glass in the building. Because the outer edge of the first glass pane 1 is fixed by the first sealant 6 and the second sealant 8, when wind load acts on the first surface 11, the first glass pane 1 deforms, causing it to bend, and a force acting against the deformation acts on the outer edge of the first glass pane 1. Therefore, the first sealant 6 and the second sealant 8, which are located on the outer edge of the first glass pane 1, experience tensile stress toward the outside of the room.

[0057] Furthermore, in a high-rise building where the double-glazed glass for buildings 100 is installed, the atmospheric pressure is expected to be lower and the influence of solar radiation greater than on flat ground. Therefore, the gas filling the first hollow layer 4 and the second hollow layer 5, which are sealed spaces, is expected to expand or contract due to the effects of atmospheric pressure and external temperature. Specifically, when the pressure of the gas filling the first hollow layer 4 and the second hollow layer 5 becomes higher than the external pressure, the gas expands. Furthermore, when the temperature of the gas filling the first hollow layer 4 and the second hollow layer 5 increases, the gas expands, and when the temperature of the gas decreases, the gas contracts. Because the outer edges of the first glass sheet 1 and the third glass sheet 3 are fixed by the first sealing material 6, 7 and the second sealing material 8, respectively, when the gas filling the first hollow layer 4 and the second hollow layer 5 expands and contracts, the glass sheets 1, 3 bend, and a force acting against the deformation acts on the outer edges of the glass sheets 1, 3. Therefore, tensile stress and compressive stress are generated in the first sealing materials 6 and 7 and the second sealing material 8 disposed on the outer edge portions of the glass plates 1 and 3, respectively.

[0058] Double-glazing glass installed in a building is expected to be used continuously for, for example, 30 to 40 years. Therefore, it is expected that the first sealing materials 6, 7 and the second sealing material 8 will be repeatedly subjected to stress due to wind loads and fluctuations in atmospheric pressure or temperature. If the first sealing materials 6, 7 or the second sealing material 8 are deteriorated or damaged by stress, for example, cracks may occur, which may cause leakage of the gas filled in the first hollow layer 4 or the second hollow layer 5, resulting in a loss of the insulating properties of the double-glazing glass for buildings 100. Furthermore, moisture may penetrate into the first hollow layer 4 or the second hollow layer 5, causing internal condensation. Furthermore, the fixation of the glass sheets 1, 2, and 3 may be released, causing the glass sheets 1, 2, and 3 to rattle under wind load or to shift in position. Therefore, it is preferable to use materials that are less susceptible to deterioration or damage even after long-term use for the first sealing materials 6, 7 and the second sealing material 8.

[0059] [First sealing material] In this embodiment, the first sealing materials 6, 7 preferably have gas barrier properties. This reduces the flow of gas into and out of the first hollow layer 4 and the second hollow layer 5, thereby maintaining the thermal insulation properties of the double-glazing glass for buildings 100. The first sealing materials 6, 7 also preferably have wind pressure resistance. In this embodiment, wind pressure resistance refers to the ability of the first sealing materials 6, 7 to repeatedly deform while remaining in close contact with the glass sheets 1, 2, 3 in response to changes in shape of the glass sheets 1, 2, 3 due to wind loads and other factors. In other words, wind pressure resistance means having good adhesion and a high elastic modulus. The wind pressure resistance of the first sealing materials 6, 7 can suppress damage to the first sealing materials 6, 7 even when wind loads act on the first surface 11, causing tensile stress to act on the first sealing materials 6, 7.

[0060] Furthermore, the first sealing materials 6, 7 in this embodiment are made of a single material. Therefore, when aluminum spacers or the like are used as the first sealing materials 6, 7, a sealant, which was required to bond the first sealing materials 6, 7 to the glass plates 1, 2, and 3, is no longer necessary. If a sealant is used, when the glass plates 1, 2, and 3 are repeatedly subjected to stress due to wind loads or changes in atmospheric pressure or temperature, the sealant is also repeatedly subjected to stress. If the sealant cannot absorb the stress, the sealant may be damaged or the bond between the sealant and the first sealing materials 6, 7 may be broken. Therefore, by making the first sealing materials 6, 7 from a single material, the sealant can be eliminated, thereby solving these problems. Furthermore, in this embodiment, the first sealing materials 6, 7 are resistant to wind pressure, so that the first sealing materials 6, 7 can maintain their adhesion to the glass plates 1, 2, and 3 even when repeatedly subjected to stress. As a result, the durability of the double glazing 100 for buildings is improved, and it becomes possible to install the double glazing even in buildings and the like that are used in harsh environments.

[0061] The water vapor permeability coefficient of the first sealing materials 6 and 7 is 0.2E-12 (mol m) / (m 2·s·Pa) or less. The water vapor permeability coefficient is the amount of test gas that permeates the test piece per unit thickness, unit area, unit time, and unit partial pressure difference between both sides of the test piece. The measurement method complies with JIS K 7126. The smaller the permeability coefficient, the higher the gas barrier property. Therefore, by using a material with such a small permeability coefficient as the first sealing materials 6, 7, it is possible to prevent water vapor from entering the first hollow layer 4 and the second hollow layer 5 from the outside. As a result, it is possible to prevent internal condensation in the double glazing glass for buildings 100. In addition, the oxygen permeability coefficient of the first sealing materials 6, 7 is 1.0E-15 mol·m / (m 2 ·s·Pa) or less, and the carbon dioxide permeability coefficient is 5.0E-15 mol·m / (m 2 s·Pa) or less. If there is no inflow or outflow of gas in the first hollow layer 4 and the second hollow layer 5, the pressure of the Ar or Kr filled inside can be maintained, and the thermal insulation properties of the double glazing glass for buildings 100 can be maintained.

[0062] The rebound resilience of the first sealing material 6, 7 is preferably 3% to 40% inclusive, more preferably 3% to 30% inclusive, more preferably 3% to 20% inclusive, and even more preferably 3% to 15% inclusive. The rebound resilience refers to the ratio of the height of the object after rebound to the height of the object when it is dropped onto a test piece. The measurement method conforms to JIS K 6255. The smaller the rebound resilience, the smaller the rebound and the higher the energy absorption rate. Therefore, even if tensile stress or compressive stress is repeatedly applied to the first sealing material 6, 7, the first sealing material 6, 7 absorbs these stresses, thereby suppressing deterioration and damage to the first sealing material 6, 7.

[0063] The first sealing materials 6, 7 as described above may contain a polyisobutylene-based resin containing an isobutylene polymer represented by general formula (I), or a polyisobutylene consisting only of an isobutylene polymer represented by general formula (I), or a butyl rubber represented by general formula (II). [ka] [ka]

[0064] Polyisobutylene is composed of long-chain hydrocarbons synthesized by the polymerization of isobutylene. Polyisobutylene has two methyl groups in its side chains, which inhibits molecular motion in the main chain due to steric hindrance. This results in high internal friction and low resilience. Therefore, by using polyisobutylene as the first sealing materials 6 and 7, stress acting on the first sealing materials 6 and 7 can be absorbed, making the first sealing materials 6 and 7 less likely to break, and improving the durability of the double-glazed glass for buildings 100.

[0065] In addition, polyisobutylene has two methyl groups in its side chains, which sterically hinders the molecular motion of the main chain, resulting in low gas permeability and excellent gas barrier properties.

[0066] In general formula (I), n is preferably an integer of not more than 10000. Since an increase in the degree of polymerization leads to an increase in mechanical strength, it is preferable that the degree of polymerization of polyisobutylene is 100 or more.

[0067] Similarly to polyisobutylene, polyisobutylene resins have two methyl groups in their side chains, which sterically inhibits the molecular motion of the main chain, resulting in low resilience and high gas barrier properties. Therefore, using polyisobutylene resins as the first sealing materials 6 and 7 can improve the durability of the double glazing glass 100 for buildings.

[0068] Butyl rubber represented by general formula (II) is a copolymer consisting of isobutylene and a small amount of isoprene. It is preferable that the amount of isoprene added be approximately 3 mol% or less. Butyl rubber has unsaturated sites in its skeleton due to the small amount of isoprene. Because butyl rubber also has two methyl groups in its side chains, steric hindrance suppresses molecular motion in the main chain. As a result, butyl rubber exhibits high gas barrier properties and low impact resilience. Therefore, using butyl rubber as the first sealing material 6, 7 can improve the durability of the double-glazed glass for buildings 100. It is preferable that m and n in general formula (II) are integers of 10,000 or less. Since mechanical strength increases with increasing degree of polymerization, these values ​​should be determined according to the required material strength. The butyl rubber may also be halogenated.

[0069] The height of the first sealing materials 6, 7 along the plate surfaces 12, 13, 14, and 15 of the glass plates 1, 2, and 3 is preferably 4.0 mm to 10.0 mm, more preferably 4.5 mm to 8.0 mm, and even more preferably 5.0 mm to 6.0 mm. If the height of the first sealing materials 6, 7 is less than 4.0 mm, the force acting on the first sealing materials 6, 7 due to the wind load acting on the double-glazing glass for buildings 100 will be large, causing fatigue degradation of the first sealing materials 6, 7 and reducing gas barrier properties. Furthermore, if the height of the first sealing materials 6, 7 is greater than 10.0 mm, the heat transfer path between indoors and outdoors via the first sealing materials 6, 7 will be large, making it difficult to maintain long-term thermal insulation. The stress acting on the first sealing materials 6, 7 varies depending on the location where the double-glazing glass for buildings 100 is installed. Specifically, the wind load acting on the double-glazing unit 100 for buildings varies depending on the height of the building, the area where the building is located, and whether the double-glazing unit is installed in a general area or a corner.

[0070] The first sealing materials 6 and 7 may also contain a desiccant capable of absorbing and releasing moisture. The presence of a desiccant allows the first hollow layer 4 and the second hollow layer 5 to be dried. Examples of such desiccant include silica gel, CaCl2, Na2SO4, activated carbon, silicate, bentonite, and zeolite. The average particle size of the desiccant is preferably 0.1 μm or more and 50 μm or less. The desiccant is dispersed in the first sealing materials 6 and 7 without agglomerating, so that the physical properties of the first sealing materials 6 and 7 are not impaired.

[0071] [Second sealing material] The second sealing material 8 bonds the glass sheets 1, 2, and 3 together. In this embodiment, since the first sealing materials 6 and 7 have gas barrier properties, the second sealing material 8 does not need to have gas barrier properties. This makes it possible to select a highly durable material for the second sealing material 8. Because the double glazing for buildings 100 is used in an environment with long-term changes in temperature and pressure, the second sealing material 8 is susceptible to the effects of moisture contained in the air. Therefore, it is preferable that the second sealing material 8 be a material that does not deteriorate due to moisture contained in the air. Examples of such materials include silicone, room-temperature curing silicone rubber, high-temperature curing silicone rubber, peroxide-curing silicone rubber, addition-curing silicone rubber, polyurethane, and the like. In particular, silicone is preferably used as the second sealing material 8 because it does not swell with moisture and can bond the glass sheets 1, 2, and 3 together.

[0072] The height of the second sealing material 8 along the plate surfaces 12, 13, 14, and 15 of the glass plates 1, 2, and 3 is preferably 4 mm to 20 mm, more preferably 5 mm to 16 mm, and even more preferably 6 mm to 12 mm. If the height of the second sealing material 8 is less than 4 mm, the force acting on the second sealing material 8 in response to the wind load acting on the double-glazing glass for buildings 100 will be too great, causing fatigue degradation of the second sealing material 8 and reducing gas barrier properties. If the height of the second sealing material 8 is greater than 20 mm, the heat transfer path between indoors and outdoors via the second sealing material 8 will be too large, making it difficult to maintain long-term thermal insulation. The stress acting on the second sealing material 8 varies depending on the location where the double-glazing glass for buildings 100 is installed. Specifically, the wind load acting on the double-glazing glass for buildings 100 will vary depending on the height of the building, the region where the building is located, and whether the double-glazing glass is installed in a general area or a corner.

[0073] Furthermore, the height of the second sealing material 8 along the plate surfaces 12, 13, 14, and 15 of the glass sheets 1, 2, and 3 is preferably equal to or greater than the height of the first sealing materials 6 and 7. The second sealing material 8 deforms in response to deformation of the glass sheets 1, 2, and 3 to bond the glass sheets 1, 2, and 3, so providing the second sealing material 8 allows the double glazing glass for buildings 100 to maintain its wind load resistance and thermal insulation properties for a long period of time. In particular, if the height of the second sealing material 8 is equal to or greater than the height of the first sealing materials 6 and 7, the durability of the second sealing material 8 is improved, allowing the double glazing glass for buildings 100 to maintain its wind load resistance and thermal insulation properties for a long period of time. If the height of the second sealing material 8 is smaller than the height of the first sealing materials 6 and 7, the durability of the second sealing material 8 is reduced, resulting in a decrease in the wind load resistance and thermal insulation properties of the double glazing glass for buildings 100, or in the inability to achieve both of these properties.

[0074] [Glass plate] The first glass plate 1 and the third glass plate 3 have substantially the same rectangular outer shape. The area of ​​these plate surfaces 11, 12, 15, and 16 is 3 m 2 It is preferable that it is equal to or greater than 4 m, and more preferably, 2 More than 5m, preferably 2That's all. The larger the area of ​​the glass plate, the better the lighting and design. On the other hand, the larger the area of ​​the glass plate, the more difficult it becomes to maintain the sealing properties of the first cavity layer 4 and the second cavity layer 5. For example, if the surface area of ​​a glass plate for a house is 1 m 2 If the glass is 1m x 1m, the perimeter of the glass plate is 4m, but the surface area of ​​the glass plate for the building is 3m 2 In the case of a glass panel with a diameter of 1 m x 3 m, the perimeter of the glass panel is 8 m, twice that of glass panels for residential use. This increases the area required for the first sealants 6, 7 and second sealant 8 to seal the hollow layers 4, 5, making it difficult to maintain long-term sealing performance due to the increased risk of gas leakage caused by breakage of these sealants. Furthermore, with large-area glass panels, the wind load acting on the first surface 11 increases, accelerating the deterioration of the first sealants 6, 7 and second sealant 8. This also increases the wind pressure resistance required of the double-glazed glass panel 100 for buildings. Therefore, it is advisable to select the material and height of the first sealants 6, 7 that are wind pressure resistant and maintain the sealing performance of the first hollow layer 4 and second hollow layer 5, depending on the area of ​​the glass panels 1, 3.

[0075] The thickness of the first glass plate 1 and the third glass plate 3 is preferably 5 mm or more and 20 mm or less, and more preferably 8 mm or more and 15 mm or less. The thickness of the glass plates 1 and 3 should be selected depending on the installation conditions so as to satisfy the wind pressure resistance standard.

[0076] The first glass plate 1 and the third glass plate 3 may be single-pane glass or any type of glass, such as tempered glass or laminated glass. However, it is preferable that the first glass plate 1 be laminated glass and the third glass plate 3 be single-pane glass. This makes the first glass plate 1 durable and less likely to break, and even if it does break, glass fragments are less likely to scatter, making it suitable for use as crime prevention glass or disaster prevention glass. Furthermore, using single-pane glass for the third glass plate 3 makes it possible to reduce the overall weight of the double-glazing glass for buildings 100. The thicknesses of the first glass plate 1 and the third glass plate 3 may be the same or different.

[0077] A Low-E film 9 may be formed on the second surface 12 of the first glass plate 1, the surface that is not in contact with the first sealing material 6 and the second sealing material 8. The Low-E film 9 is, for example, a conductive thin film. The surface resistivity of the conductive thin film is preferably less than 20 Ω. In this case, the conductive thin film (Low-E film 9) has high reflectance in the wavelength range from the infrared region to the radio wave region. Therefore, the second surface 12 on which the Low-E film 9 is formed has low emissivity, thereby improving the thermal insulation performance of the double glazing glass for buildings 100.

[0078] The Low-E film 9 is not particularly limited as long as it does not impede the objectives of the present invention, but is preferably a multilayer film including a layer mainly composed of silver. The Low-E film 9 is also preferably a multilayer film formed by stacking two or more layers selected from a metal layer, a metal oxide layer, a metal nitride layer, and a metal oxynitride layer. A suitable example of the metal layer is a silver layer. Suitable examples of the metal oxide layer include a tin oxide layer, a titanium oxide layer, a zinc oxide layer, or a zinc tin oxide layer. A suitable example of the metal nitride layer is silicon nitride. A suitable example of the metal oxynitride layer is silicon oxynitride. The Low-E film 9 is preferably formed by a vacuum deposition method such as physical vapor deposition (PVD), with sputtering being particularly preferred because it can form a uniform film over a large area. The surface of the second surface 12 on which the Low-E film 9 is not formed can be formed, for example, by forming the Low-E film 9 on a glass plate by sputtering and then removing the Low-E film 9 using a grindstone or the like. The surface on which the Low-E film 9 is not formed may be masked using various masking materials. By forming the Low-E film 9 using such a method, it is possible to easily place the Low-E film 9 at a desired position on the glass plate.

[0079] Furthermore, the Low-E film 9 is more preferably composed of a multilayer structure in which three or more layers selected from a tin oxide layer, a zinc tin oxide layer, a silicon nitride layer, a silicon oxynitride layer, a titanium oxide layer, a zinc oxide layer, and a silver layer are laminated. For example, it is most preferable that the Low-E film 9 be composed of three or five layers in which, from the surface of the glass plate, (1) a tin oxide layer (first antireflection layer), a zinc oxide layer (first antireflection layer), a silver layer (metal layer), an aluminum-added zinc oxide layer (second antireflection layer), and a tin oxide layer (second antireflection layer) are laminated in this order.

[0080] The Low-E film 9 contains a metal layer whose main component is silver. The thickness of the metal layer is preferably 5 nm to 25 nm, and more preferably 5 nm to 20 nm. When the Low-E film 9 has a metal layer whose main component is silver and has a predetermined thickness, it can suppress heat radiation. This allows the double glazing glass 100 for buildings to have improved thermal insulation performance. Furthermore, when the thickness of the metal layer is 25 nm or less, it is possible to reduce the impact of the Low-E film 9 on the appearance.

[0081] The Low-E film 9 preferably has a first antireflection layer on the inner side of the metal layer, closer to the plate surface on which the Low-E film 9 is formed, and the total optical thickness of the first antireflection layer is preferably 60 nm or more and 120 nm or less. The Low-E film 9 preferably has a second antireflection layer on the outer side of the metal layer, farther from the plate surface on which the Low-E film 9 is formed, and the total optical thickness of the second antireflection layer is preferably 60 nm or more and 120 nm or less. The optical thickness can be calculated by (refractive index n) x (film thickness d). When the first antireflection layer (second antireflection layer) is composed of multiple films, the sum of the optical thicknesses calculated for each film is the optical thickness of the first antireflection layer (second antireflection layer). When calculating the optical thickness, the refractive index varies depending on the wavelength of visible light. Here, the optical thickness is calculated based on the refractive index when the wavelength of visible light is a common reference wavelength (550 nm) in the visible range.

[0082] As described above, the Low-E film 9 has a first antireflection layer of a predetermined thickness located on the side of the first glass plate 1 closer to the second surface 12 of the first glass plate 1 relative to the metal layer, thereby protecting the metal layer and providing the Low-E film 9 with low reflectivity, thereby reliably blocking heat. Furthermore, the double glazing glass 100 for buildings can achieve high visible light transmittance and a suitable reflected color tone.

[0083] Furthermore, even if a second antireflection layer of a predetermined thickness is present on the side of the first glass plate 1 farther from the second surface 12 relative to the metal layer, the Low-E film 9 protects the metal layer, allowing the Low-E film 9 to have low reflection performance and reliably block heat. Furthermore, the double glazing glass 100 for buildings can achieve high visible light transmittance and a suitable reflected color tone.

[0084] The second glass plate 2 may have an outer shape similar to that of the first glass plate 1 and the third glass plate 3, but may have a smaller plate surface area than these. The second glass plate 2 may have a shape that is, for example, 1 mm to 10 mm shorter in the vertical and horizontal directions than the first glass plate 1 and the third glass plate 3. The glass plates 1, 2, and 3 are arranged so that their centers overlap when viewed in the stacking direction. Therefore, the outer edge surface of the second glass plate 2 is located, for example, 1 mm to 10 mm away from the outer edge surfaces of the first glass plate 1 and the third glass plate 3.

[0085] The thickness of the second glass plate 2 can be any value, but if the thickness of the second glass plate 2 is less than 2 mm, the wind pressure resistance and soundproofing properties will be reduced, and if the thickness of the second glass plate 2 is more than 20 mm, the weight of the double glazing unit 100 for buildings will be heavy. Therefore, the thickness of the second glass plate 2 is preferably 2 mm or more and 20 mm or less. This makes it possible to reduce the weight of the second glass plate 2 and thus the weight of the entire double glazing unit 100 for buildings, while still obtaining a double glazing unit 100 for buildings that has wind pressure resistance and heat insulation properties.

[0086] As shown in FIG. 1 , the second sealing material 8 is disposed flush with the outer edge surfaces of the first glass plate 1 and the third glass plate 3. When the outer edge surface of the second glass plate 2 is located away from the outer edge surfaces of the first glass plate 1 and the third glass plate 3, the outer edge surface of the second glass plate 2 may be coated with the second sealing material 8. This allows the second glass plate 2 to displace in accordance with the deformation of the second sealing material 8, thereby maintaining the sealing properties of the first hollow layer 4 and the second hollow layer 5 and suppressing gas leakage associated with the displacement of the second glass plate 2. Furthermore, even if repeated stresses due to wind load or expansion or contraction of the gas filled in the first hollow layer 4 and the second hollow layer 5 act on the first sealing materials 6 and 7, causing damage to the first sealing materials 6 and 7 or peeling off from the second glass plate 2, the second sealing material 8 secures the second glass plate 2, preventing the second glass plate 2 from shifting position. In particular, the first sealing material 6, which is subjected to wind loads, is prone to deterioration over time, but by fixing the second glass plate 2 with the second sealing material 8, the sealing properties of the first hollow layer 4 can be maintained, thereby improving the durability of the double-glazed glass 100 for buildings.

[0087] Furthermore, by coating the outer edge surface of the second glass pane 2 with the second sealing material 8, external forces are less likely to be transmitted to the second glass pane 2, for example, during transportation or installation of the double glazing unit 100 for buildings. This prevents breakage of the second glass pane 2, allows the thickness of the second glass pane 2 to be reduced, and improves the durability and handleability of the double glazing unit 100 for buildings.

[0088] The second glass plate 2 may be single-pane glass or tempered glass. Tempered glass has high wind pressure resistance and does not produce sharp fragments even if broken, so it is also used as safety glass. Tempered glass is made by processing ordinary glass through heat treatment, and therefore has a curved edge (edge ​​lift) at its outer edge. In this embodiment, the first sealing materials 6 and 7, which have low resilience, adhere closely to the second glass plate 2. Therefore, even if the outer edge of the second glass plate 2 is curved, no gap is formed between the second glass plate 2 and the first sealing materials 6 and 7. As a result, it is possible to maintain the sealing properties of the first cavity 4 and the second cavity 5. By using tempered glass as the second glass plate 2, the thickness of the second glass plate 2 can be reduced, thereby enabling the weight of the double glazing glass for buildings 100 to be reduced.

[0089] As shown in FIG. 2 , a through hole 20 may be formed in one of the four corners of the second glass plate 2, connecting the first hollow layer 4 and the second hollow layer 5. The through hole 20 is formed further inward in the second glass plate 2 than the outer edge where the first sealing materials 6 and 7 are provided. The diameter of the through hole 20 may be, for example, 2.5 mm to 3 mm. In this embodiment, the through hole 20 is formed in only one of the four corners of the second glass plate 2. However, a second through hole may be formed diagonally opposite the first through hole 20, or a through hole may be formed in each of the four corners, for a total of four through holes. Providing a through hole increases the number of processing steps for the second glass plate 2, so the number of through holes may be determined depending on factors such as manufacturing costs.

[0090] In the double glazing glass 100 for buildings, even if the first glass pane 1 and the third glass pane 3 are deformed due to wind load or the expansion and contraction of the gas filled in the first hollow layer 4 and the second hollow layer 5, the second glass pane 2 is not deformed because it receives stress from the first hollow layer 4 and the second hollow layer 5. Therefore, since the second glass pane 2 is not deformed, the amount of deformation of the first glass pane 1 and the third glass pane 3 increases, and if the amount of deformation exceeds the strength of the glass panes 1 and 3, they may be broken. In this embodiment, the through hole 20 can be provided to reduce the amount of deformation of the first glass pane 1 and the third glass pane 3. Furthermore, since the temperature and pressure of the gas filled in the first hollow layer 4 and the gas filled in the second hollow layer 5 can be made equal, it is possible to reduce stress acting on the first sealing materials 6 and 7, etc., even when there is a large temperature difference between indoors and outdoors.

[0091] The thermal transmittance of the double glazing 100 for buildings in this embodiment is 1.0 W / (m 2 ·K) or less. The thermal transmittance is the heat flux that passes through the center of a single glass pane or double glazing per 1K difference between the ambient air temperature on the outside and the ambient air temperature on the inside of a glass window on the exterior wall of a building. The smaller the thermal transmittance value, the better the insulating properties of the glass pane. Therefore, a thermal transmittance of 1.0W / (m 2 By keeping the heat transfer coefficient at or below 1.5 K, it is possible to improve energy-saving effects and reduce running costs. Ideally, the heat transfer coefficient should be as close to zero as possible, but in reality, there is a certain limit to how close it can be. Therefore, there is no particular lower limit for the heat transfer coefficient.

[0092] [Method for manufacturing double-glazing for buildings] The following describes a manufacturing method for the double-glazed glass for buildings 100. First, a Low-E film 9 is formed on the second surface 12 of the first glass plate 1. The Low-E film 9 can be formed by a known method. A through-hole 20 is formed in one of the four corners of the second glass plate 2. Next, the first glass plate 1 is tilted slightly from a vertical position, and a first sealing material 6 is placed on the outer edge of the second surface 12. Thereafter, the second glass plate 2 is bonded to the first glass plate 1 so that the centers of the first glass plate 1 and the second glass plate 2 coincide. Next, the first glass plate 1 and the second glass plate 2 are tilted slightly from a vertical position, and a first sealing material 7 is placed on the outer edge of the fourth surface 14 of the second glass plate 2. Then, the third glass plate 3 is bonded to the second glass plate 2 so that the centers of the second glass plate 2 and the third glass plate 3 coincide. The angle at which the glass plates 1 and 2 are tilted from the vertical is preferably 1° to 20°. This makes it difficult for the first sealing materials 6 and 7 to sag in the direction of gravity, making it possible to determine the installation positions of the first sealing materials 6 and 7.

[0093] Finally, the second sealing material 8 is placed outside the first sealing materials 6 and 7 at the outer edges of the glass plates 1, 2, and 3. This completes the double-glazing glass for buildings 100. The first sealing materials 6 and 7 and the second sealing material 8 may be formed while the glass plates 1, 2, and 3 are fixed so that their surfaces are parallel to the ground.

[0094] [Example] Examples of the present invention will be described below, but the present invention is not limited to the descriptions of these examples.

[0095] First, a method for calculating the overall heat transmission coefficient evaluated in this example will be described. The overall heat transmission coefficient can be calculated from the thermal conductivity and thickness of the glass panes and hollow layer that make up the double glazing glass 100 for buildings. In the following, the overall heat transmission coefficient was calculated in accordance with JIS R 3107.

[0096] Example 1 A double-glazing unit 100 for a building was formed using a 10 mm thick Low-E glass plate with a Low-E film 9 formed on the second surface 12 as the first glass plate 1, a 3 mm thick single-pane glass plate as the second glass plate 2, and a 10 mm single-pane glass plate as the third glass plate 3. A first hollow layer 4 and a second hollow layer 5 were formed using polyisobutylene resin as the first sealants 6 and 7, and silicone as the second sealant 8. The widths of the first hollow layer 4 and the second hollow layer 5 were each 14 mm. Ar was filled into the first hollow layer 4 and the second hollow layer 5.

[0097] The heat transmission coefficient in Example 1 is 0.9 W / (m 2 ·K).

[0098] Comparative Example 1 As Comparative Example 1, a double-glazed glass 100 for a building was produced that did not have a third glass plate 3 or a second air space 5, but only had a first air space 4. The process was the same as in Example 1, except that a single-pane glass plate with a thickness of 10 mm was used as the second glass plate 2, and the width of the first air space 4 was 16 mm.

[0099] The heat transmission coefficient in Comparative Example 1 is 1.1 W / (m 2 ·K). From the above, the thermal transmittance of the double glazing glass 100 for buildings with two hollow layers was 1.0 W / (m 2 ·K) or less, and it was found that the insulation performance was excellent.

[0100] In addition to the above examples, weather resistance tests were conducted on double glazing for buildings 100 in which the heights of the first sealing materials 6, 7 along the plate surfaces of the glass plates 1, 2, and 3 and the height of the second sealing material 8 were changed, and the gas concentrations of Ar gas sealed in the first hollow layer 4 and the second hollow layer 5 were measured. The weather resistance tests were conducted in accordance with JIS R 3224-3, and the bottom edge of the double glazing for buildings 100 was placed 15 m above ground level, and the gas concentrations were measured one year later.

[0101] Example 2 A double-glazing glass 100 for a building was produced in the same manner as in Example 1. In Example 2, glass plates 1, 2, and 3 measuring 3 m x 1 m were used, and the heights of the first sealing materials 6 and 7 along the plate surfaces of the glass plates 1, 2, and 3 were 6 mm, and the height of the second sealing material 8 was 10 mm.

[0102] After the weather resistance test in Example 2, the concentration of Ar gas sealed in the first hollow layer 4 and the second hollow layer 5 was 99.5%.

[0103] Comparative Example 2 A double-glazed glass panel 100 for buildings was produced in the same manner as in Example 2, except that the height of the first sealing material 6, 7 along the plate surfaces of the glass plates 1, 2, 3 was 3 mm and the height of the second sealing material 8 was 10 mm.

[0104] After the weather resistance test in Comparative Example 2, the concentration of Ar gas sealed in the first hollow layer 4 and the second hollow layer 5 was 94.8%.

[0105] Comparative Example 3 A double-glazed glass panel 100 for buildings was produced in the same manner as in Example 2, except that the height of the first sealing material 6, 7 along the plate surfaces of the glass plates 1, 2, 3 was 6 mm and the height of the second sealing material 8 was 3 mm.

[0106] After the weather resistance test in Comparative Example 3, the concentration of Ar gas sealed in the first hollow layer 4 and the second hollow layer 5 was 97.2%.

[0107] The above results indicate that gas leakage occurred when the height of the first sealing materials 6 and 7 along the surfaces of the glass sheets 1, 2, and 3 was less than 4 mm (Comparative Example 2), resulting in inferior durability compared to Example 2. Furthermore, gas leakage also occurred when the height of the second sealing material 8 along the surfaces of the glass sheets 1, 2, and 3 was equal to or less than the height of the first sealing materials 6 and 7 (Comparative Example 3), resulting in inferior durability compared to Example 2. On the other hand, the Ar gas concentration in Example 2 was as high as 99.5% even after the weather resistance test. This indicates that a double-glazed glass panel 100 for buildings in which the height of the first sealing materials 6 and 7 along the surfaces of the glass sheets 1, 2, and 3 was 4 mm or more and the height of the second sealing material 8 was equal to or greater than the height of the first sealing materials 6 and 7 can suppress gas leakage. Therefore, the present invention can provide a double-glazed glass panel 100 for buildings that is highly durable and can suppress gas leakage even when subjected to impacts related to wind loads and vibration loads.

[0108] Other Embodiments (a) In the above embodiment, the first hollow layer 4 and the second hollow layer 5 are filled with dry air, Ar, or Kr, but at least one of these may be depressurized to a vacuum level.

[0109] (b) In the above embodiment, the Low-E film 9 is disposed on the second surface 12 of the first glass plate 1, but the Low-E film 9 may also be disposed on the first surface 11 of the first glass plate 1 or the fourth surface 14 of the second glass plate 2. In other words, the Low-E film 9 may be disposed on one or more of both surfaces 11, 12 of the first glass plate 1 and both surfaces 13, 14 of the second glass plate 2.

[0110] (c) In the above embodiment, the double glazing 100 for buildings is shown as being made up of three glass plates, but it may be made up of two glass plates, or four or more glass plates.

[0111] (d) In the above embodiment, the second sealing material 8 covers the outer edge surface of the second glass plate 2, but the second sealing material 8 does not have to cover the outer edge surface of the second glass plate 2. In this case, it is preferable that the surface area of ​​the second glass plate 2 is the same as the surface area of ​​the first glass plate 1 and the third glass plate 3.

[0112] (e) The double glazing 100 for a building may have a large number of spacers that maintain the distance between the pair of glass panes. [Industrial Applicability]

[0113] The present invention can be used to produce highly durable double-glazing glass for buildings. [Explanation of symbols]

[0114] 1: First glass plate 2: Second glass plate 3: Third glass plate 4: 1st hollow layer 5: 2nd hollow layer 6: First sealing material 7: First sealing material 8: Second sealing material 20:Through hole 100: Double-glazed glass for buildings

Claims

1. Two or more glass plates arranged opposite each other; a first sealing material disposed on the outer edge of each of the glass plates and forming a hollow layer in which a gas is sealed; a second sealing material provided outside the first sealing material at the outer edge of the hollow layer, The first sealing material is a double-glazed glass for buildings made of a single material having gas barrier properties and wind pressure resistance.

2. The first sealing material has a water vapor permeability coefficient of 0.2E-12 (mol m) / (m ２ 2. The double-glazing glass for a building according to claim 1, wherein the modulus of elasticity is 1.0·s·Pa or less.

3. The double glazing for a building according to claim 1 , wherein the first sealing material has a resilience coefficient of 3% or more and 40% or less.

4. The double-glazing unit for a building according to claim 1 , wherein the first sealing material contains a polyisobutylene-based resin.

5. The double glazing for a building according to claim 4, wherein the first sealing material is polyisobutylene.

6. The double glazing unit for a building according to claim 1 , wherein the first sealing material comprises butyl rubber.

7. The double glazing for a building according to claim 1, wherein a desiccant having an average particle size of 50 μm or less is dispersed in the first sealing material.

8. The surface area of ​​the glass plate is 3 m ２ The double glazing for buildings according to claim 1, wherein

9. The double glazing for a building according to claim 1, wherein the gas contains Ar or Kr.

10. The double-glazing glass for a building according to claim 9, wherein the width of the hollow layer is 5 mm or more and 16 mm or less.

11. the two or more glass plates include a first glass plate on the exterior side, a second glass plate arranged opposite the first glass plate, and a third glass plate arranged opposite the second glass plate, The double-glazing glass for a building according to any one of claims 1 to 10, wherein the hollow layer comprises a first hollow layer formed between the first glass sheet and the second glass sheet, and a second hollow layer formed between the second glass sheet and the third glass sheet.

12. The double glazing for a building according to claim 11, wherein the second glass plate has a thickness of 2 mm or more and 20 mm or less.

13. The double-glazing unit for a building according to claim 11, wherein the height of the second sealing material along the surface of the glass plate is 4 mm or more and 20 mm or less.

14. a height of the first sealing material along the plate surface is 4 mm or more and 10 mm or less; The double-glazing unit for a building according to claim 13, wherein the height of the second sealing material along the plate surface is equal to or greater than the height of the first sealing material.

15. The double glazing for a building according to claim 11, wherein an outer end surface of the second glass plate is covered with the second sealing material.

16. Heat transmission coefficient is 1.0W / (m ２ The double-glazing glass for a building according to claim 11, wherein the thickness is 0.05 mm or less.

17. The double-glazing unit for a building according to claim 11, wherein the second glass sheet has a through hole formed therein that connects the first hollow layer and the second hollow layer.

18. The double glazing for a building according to claim 11, wherein a Low-E film is formed on a surface of the first glass plate facing the second glass plate or on a surface of the third glass plate facing the second glass plate.

19. The double glazing for a building according to claim 11, wherein the second glass sheet is tempered glass.

20. The double-glazing unit for a building according to claim 11, wherein the first glass sheet is laminated glass and the third glass sheet is single glass.

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