JP2022051457A - Double glazing for vehicles - Google Patents

Abstract

To provide double glazing for vehicles that achieves light weight while having high heat insulation performance.SOLUTION: The inventive double glazing for vehicles includes a pair of glass plates facing each other, a sealant to seal the periphery of the pair of glass plates, and a spacer disposed between the pair of glass plates, wherein the pair of glass plates each have a curved face with its principal face curved protruding in one direction; and at lease one of the pair of glass plates has a thickness of 2.1 mm or more and less than 3.0 mm.SELECTED DRAWING: Figure 2

Description

The present invention relates to double glazing for vehicles.

Insulated glass or soundproof glass used in the fields of construction and industry is made by sealing the peripheral edges of glass plates while maintaining a vacuum layer (vacuum layer) between multiple glass plates. Insulated glazing is known. Since such double glazing has a vacuum layer between the plurality of glass plates, it has higher heat insulating performance than when air or an inert gas is sealed between the glass plates.

As such double glazing, for example, an exhaust double glazing in which the peripheral ends of glass plates separated by a vacuum layer are sealed by a sealed glass bulk and a plurality of spacers are arranged in the vacuum layer is disclosed. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2008-201662

However, the exhaust double glazing of Patent Document 1 does not describe the thickness of the glass plate. And usually, when the double glazing is applied for a vehicle, the glass plate is often used with the main surface curved. Therefore, the exhaust double glazing as in Patent Document 1 exhibits high heat insulating performance when two curved glass plates are sealed in a state of facing each other, so that the displacement between the glass plates is suppressed and the sealing is high. It is necessary to be able to secure sex. Further, in order to apply the double glazing to a vehicle, it is necessary to be lighter in order to reduce the fuel consumption of the vehicle.

One aspect of the present invention is to provide a double glazing for a vehicle which can be reduced in weight while having high heat insulating performance.

One aspect of the double glazing for vehicles according to the present invention is arranged between a pair of glass plates arranged opposite to each other, a sealing material for sealing the peripheral edge of the pair of glass plates, and the pair of glass plates. The pair of glass plates has a curved surface whose main surface is curved in one direction, and the thickness of at least one of the pair of glass plates is increased. It is 2.1 mm or more and less than 3.0 mm.

The double glazing for vehicles according to the present invention can be reduced in weight while having high heat insulating performance.

It is a top view of the double glazing for a vehicle which concerns on embodiment of this invention. FIG. 1 is a cross-sectional view taken along the line II of FIG. It is a figure for demonstrating the curvature of a glass plate. It is explanatory drawing which shows a part of the process of the manufacturing method of the double glazing for a vehicle. It is explanatory drawing which shows the other part of the process of the manufacturing method of the double glazing for a vehicle. It is explanatory drawing which shows the other part of the process of the manufacturing method of the double glazing for a vehicle. It is explanatory drawing which shows the other part of the process of the manufacturing method of the double glazing for a vehicle. It is explanatory drawing which shows the other part of the process of the manufacturing method of the double glazing for a vehicle. It is explanatory drawing which shows the other part of the process of the manufacturing method of the double glazing for a vehicle. It is explanatory drawing which shows the other part of the process of the manufacturing method of the double glazing for a vehicle. It is explanatory drawing which shows the other part of the process of the manufacturing method of the double glazing for a vehicle. It is sectional drawing which shows the other example of the structure of the double glazing for a vehicle.

Hereinafter, embodiments of the present invention will be described in detail. In addition, in order to facilitate understanding of the description, the same reference numerals are given to the same components in each drawing, and duplicate description is omitted. In addition, the scale of each member in the drawing may differ from the actual scale. In the present specification, the tilde "-" indicating a numerical range means that the numerical values described before and after the tilde are included as the lower limit value and the upper limit value unless otherwise specified.

<Double glazing for vehicles>
The double glazing for vehicles according to the embodiment of the present invention will be described. The double glazing for vehicles according to the present embodiment is between a pair of glass plates arranged opposite to each other, a sealing material which is a sealing material for sealing the peripheral edge of the pair of glass plates, and a pair of glass plates. It is a double glazing with an arranged spacer. The vehicle double glazing according to the present embodiment is for automobile window glass such as front glass, rear glass, side glass, roof glass, quarter glass, window glass for transportation such as trains and locomotives, and for construction of bulldozers and the like. It is used for windowpanes for vehicles, windowpanes for flying objects such as airplanes, and windowpanes for other special vehicles.

FIG. 1 is a plan view of the double glazing for a vehicle according to the present embodiment, and FIG. 2 is a cross-sectional view taken along the line II of FIG. In FIGS. 1 and 2, one of the main surfaces of the double glazing for vehicles 1 is the outside of the vehicle, and the other is the inside of the vehicle. In FIG. 1, the front side is the outside of the vehicle and the back side is the inside of the vehicle. In FIG. 1, the longitudinal direction of the double glazing 1 for a vehicle corresponds to, for example, the front-rear direction of the vehicle, but may correspond to the vehicle width direction of the vehicle. In FIG. 2, the upper side is the outside of the vehicle and the lower side is the inside of the vehicle.

As shown in FIG. 1, the double glazing 1 for a vehicle is formed in a substantially rectangular shape in a plan view and has rounded corners. Further, as shown in FIG. 2, the double glazing 1 for a vehicle has a curved surface whose main surface is curved in a convex shape toward the outside of the vehicle.

As shown in FIG. 2, the double glazing 1 for a vehicle includes a pair of glass plates 10A and 10B, a sealing material 20, a spacer 30, a gas adsorbent 40, a heat reflecting film 50, and shielding portions 60A and 60B. .. A sealing material 20, a spacer 30, a gas adsorbent 40, and a heat reflecting film 50 are arranged between the pair of glass plates 10A and 10B. In the vehicle double glazing 1, the spacer 30 arranged between the pair of glass plates 10A and 10B can be visually recognized from the outside via the glass plates 10A and 10B. It is preferable that the gas adsorbent 40 is shielded by overlapping with at least one of the shielding portions 60A and 60B in the plan view of the vehicle double glazing 1 and cannot be visually recognized from the outside through at least one of the glass plates 10A and 10B. , It is more preferable to be shielded by both. The heat reflective film 50 preferably has a small visible light transmittance so that it cannot be visually recognized from the outside.

The vehicle double glazing 1 has a vacuum space S between the pair of glass plates 10A and 10B and the sealing material 20. The degree of vacuum of the vacuum space S is preferably a predetermined value or less, and is preferably 0.01 Pa or less, for example. The vacuum space S can be formed by exhausting the air between the glass plates 10A and the glass plates 10B and sealing the glass plates 10A and 10B and the sealing material 20. The interval (gap) of the vacuum space S can be appropriately set, and is, for example, 10 μm to 1000 μm.

Hereinafter, each member constituting the vehicle double glazing 1 will be described.

As shown in FIG. 1, the glass plates 10A and 10B are formed in a substantially rectangular shape in a plan view and have rounded corners. As shown in FIG. 2, the pair of glass plates 10A and 10B are arranged so as to face each other via the sealing material 20, the spacer 30, the gas adsorbent 40, and the heat reflecting film 50. The shapes of the glass plates 10A and 10B in a plan view can be appropriately formed according to the installation location of the vehicle. For example, the shapes of the glass plates 10A and 10B in a plan view may be a substantially trapezoidal shape, a substantially parallel quadrilateral shape, or a substantially triangular shape.

As shown in FIG. 2, the glass plate 10A has a first main surface 101A in contact with the spacer 30 and a second main surface 102A located on the outer side opposite to the first main surface 101A. The inner surface of the glass plate 10A located inside the vehicle is the first main surface 101A, and the outer surface located outside the vehicle is the second main surface 102A.

The glass plate 10B has a first main surface 101B in contact with the spacer 30 and a second main surface 102B located on the outer side opposite to the first main surface 101B. The inner surface of the glass plate 10B located inside the vehicle is the first main surface 101B, and the outer surface located outside the vehicle is the second main surface 102B. The first main surface 101A of the glass plate 10A and the first main surface 101B of the glass plate 10B face each other.

The glass plate 10A has a curved surface in which the first main surface 101A and the second main surface 102A are curved in one direction. The glass plate 10B also has a curved surface in which the first main surface 101B and the second main surface 102B are curved in two directions so as to correspond to the glass plate 10A. The glass plate 10A and the glass plate 10B may have a curved surface curved in one direction. That is, the glass plate 10A and the glass plate 10B may be curved in any one direction, and the bending direction may be, for example, the longitudinal direction or the lateral direction of the glass plate 10A and the glass plate 10B. In the present embodiment, as shown in FIG. 2, the glass plate 10A has a curved surface in which the first main surface 101A and the second main surface 102A are curved outward in a convex shape. The glass plate 10B also has a curved surface in which the first main surface 101B and the second main surface 102B are curved outward in a convex shape so as to correspond to the glass plate 10A. The curvatures of the first main surface 101A and the second main surface 102A and the curvatures of the first main surface 101B and the second main surface 102B are substantially the same, but may be different.

The thickness of the glass plates 10A and 10B may be 2.1 mm or more and less than 3.0 mm. If the thickness of the glass plates 10A and 10B is 2.1 mm or more, a reinforcing layer (compressive stress layer) can be easily formed. The thickness of the glass plates 10A and 10B is preferably 2.3 mm or more, and more preferably 2.4 mm or more. If the thickness of the glass plates 10A and 10B is less than 2.1 mm, the glass plates 10A and 10B are too thin even if the glass plates 10A and 10B are strengthened, so that the glass plates 10A and 10B are hardened (compressed). It is difficult to form a stress layer).

If the thickness of the glass plates 10A and 10B is less than 3.0 mm, the degree of curvature of the glass plate 10A and the glass plate 10B is easy to match in the vehicle double glazing 1, and the glass plate 10A and the glass plate 10B are thin. By sealing the space between the glass and the glass with the sealing material 20, it is possible to have high heat insulating performance and reduce the weight. The thickness of the glass plates 10A and 10B is preferably 2.8 mm or less, more preferably 2.6 mm or less. If the thickness of the glass plates 10A and 10B exceeds 3.0 mm, the weight cannot be reduced, and if the degree of curvature of the glass plate 10A and the glass plate 10B is different, it becomes difficult to adjust the degree of curvature. Become. Therefore, when manufacturing the double glazing 1 for a vehicle, the degree of curvature of the glass plate 10A and the glass plate 10B cannot be adjusted to substantially the same size, and the space between the glass plate 10A and the glass plate 10B is sealed with the sealing material 20. Even if it is stopped, the sealing becomes insufficient, which may lead to a decrease in the degree of vacuum in the vacuum space S.

The thickness of the glass plates 10A and 10B is, for example, the thickness when measured at an arbitrary place in the cross section of the glass plates 10A and 10B. When the cross sections of the glass plates 10A and 10B have different thicknesses depending on the location, the thicknesses of the glass plates 10A and 10B may be the thickness of the thinnest portion of the respective glass plates.

The thickness of the glass plate 10A may be the same as or different from the thickness of the glass plate 10B. As long as the thickness of the glass plate 10A and the glass plate 10B is the same, glass plates of the same size can be used.

The minimum value of the radius of curvature of the glass plates 10A and 10B is preferably 500 mm to 100,000 mm, more preferably 1000 mm to 80,000 mm, still more preferably 3000 mm to 50,000 mm. The radius of curvature refers to the radius of a virtual circle in contact with the glass plates 10A and 10B, as shown in FIG. The reciprocal of the radius of curvature is the curvature, which represents the degree of bending of the glass plates 10A and 10B. That is, the smaller the radius of curvature, the larger the curvature of the glass plates 10A and 10B, which means that the main surfaces of the glass plates 10A and 10B are more curved. The larger the radius of curvature, the smaller the curvature of the glass plates 10A and 10B, which means that the main surfaces of the glass plates 10A and 10B are flatter. If the minimum value of the radius of curvature of the glass plates 10A and 10B is within the above-mentioned preferable range, the glass plates 10A and 10B have a curved shape along the shape of the window glass of the vehicle.

The glass plates 10A and 10B may be either inorganic glass or organic glass. As the inorganic glass, for example, soda lime glass, aluminosilicate glass, borosilicate glass, quartz glass, non-alkali glass and the like are used without particular limitation. Among these, soda lime glass is preferable from the viewpoint of moldability. The glass plates 10A and 10B may be colored, but are preferably transparent. Transparency means that the visible light transmittance is not substantially zero.

The glass plates 10A and 10B contain, for example, silicon, sodium, calcium and magnesium.

When the glass plates 10A and 10B are soda lime glass, the glass plates 10A and 10B have a mass percentage based on the oxide, 65% to 80% for SiO ₂ , 5% to 18% for Na ₂ O, and 5 for Ca O. It may contain% to 12%, MgO exceeding 0% to 10%, Al ₂ O ₃ from 0% to 6%, K ₂ O from 0% to 5%, and Fe ₂ O ₃ from 0% to 3%. preferable.

Further, the pair of glass plates 10A and 10B are used, for example, SrO, BaO, ZrO ₂ , _{B2O 3} , SnO ₂ , SO ₃ , Cl, F, ZnO, Y, as long as the effects of the glass plates 10A and 10B are not impaired. ₂ O ₃ , La ₂ O ₃ , TIO ₂ , V ₂ O ₅ , P ₂ O _5, CeO ₂ , WO ₃ , Nb ₂ O ₅ , Bi ₂ O ₃ , CoO, Cr ₂ O ₃ , Se, Sc ₂ O _3. Can contain one or more selected from the group consisting of MnO, CuO and MoO ₃ .

The glass plates 10A and 10B may be either unreinforced glass or tempered glass, but tempered glass is preferable because the mechanical strength can be increased. Untempered glass is glass obtained by molding molten glass into a plate shape and then slowly cooling it. The tempered glass is a glass in which a tempered glass is subjected to a tempering treatment to form a compressive stress layer in a region of a predetermined depth from the surface of the tempered glass, and the safety of the glass plates 10A and 10B can be enhanced. As the strengthening treatment, the glass plates 10A and 10B are exposed to high temperature and then air-cooled (air-cooled strengthening), the glass plates 10A and 10B are immersed in a molten salt containing an alkali metal, and the glass plates 10A and 10B are immersed. The chemical strengthening that replaces the alkali metal ion having a small atomic diameter existing on the outermost surface of the glass with the alkali metal ion having a large atomic system existing in the molten salt can be mentioned. When the glass plates 10A and 10B are tempered glass, physically tempered glass (air-cooled tempered glass) is preferable because the size of debris can be easily reduced when broken.

As shown in FIG. 2, the sealing material 20 is formed on the peripheral edge portion between the first main surface 101A of the glass plate 10A and the first main surface 101B of the glass plate 10B. Then, the sealing material 20 is formed in a frame shape as shown in FIG. 1 along the peripheral edge portion between the first main surface 101A of the glass plate 10A and the first main surface 101B of the glass plate 10B. As shown in FIG. 2, the sealing material 20 adheres both peripheral edges of the glass plate 10A and the glass plate 10B. The sealing material 20 can form a space between the glass plate 10A and the glass plate 10B. A vacuum space S is formed by adhering the sealing material 20 to the peripheral edge portion of the glass plate 10A and the peripheral edge portion of the glass plate 10B. The height of the sealing material 20 defines the distance between the glass plate 10A and the glass plate 10B, that is, the gap in the vacuum space S.

The sealing material 20 includes at least two types of sealing materials, and can include the sealing materials 20A and 20B. As shown in FIG. 1, the sealing material 20A has a peripheral edge portion of a pair of long sides of the first main surface 101A of the glass plate 10A and one short side (the short side on the side on which the gas adsorbent 40 is arranged). The sealing material 20B is formed on the peripheral edge portion of the other short side of the glass plate 10A.

The sealing materials 20A and 20B for sealing the peripheral edges of the glass plates 10A and 10B can be formed by using a glass adhesive. That is, the sealing materials 20A and 20B can be made of a cured product of a glass adhesive.

Glass adhesives include heat-meltable glass. Thermo-meltable glass is also called low melting point glass. The glass adhesive is, for example, a glass frit containing heat-meltable glass. As the glass frit, for example, bismuth-based glass frit (glass frit containing bismuth), lead-based glass frit (glass frit containing lead), vanadium-based glass frit (glass frit containing vanadium) and the like can be used. Bismuth-based glass, lead-based glass, vanadium-based glass, and the like are low-melting glass, and by using these as glass adhesives, thermal damage to the spacer 30 during the manufacture of the double glazing for vehicles 1 can be reduced. ..

The spacer 30 enhances the mechanical strength of the double glazing 1 for vehicles. As shown in FIG. 2, a plurality of spacers 30 are arranged in the vacuum space S between the glass plate 10A and the glass plate 10B. As shown in FIG. 1, the spacer 30 is provided inside the sealing materials 20A and 20B in a plan view. With the plurality of spacers 30, the distance between the glass plate 10A and the glass plate 10B can be surely secured, and the vacuum space S is easily formed.

One end of the spacer 30 is in contact with the first main surface 101A of the glass plate 10A, and the other end is in contact with the heat reflective film 50 provided on the first main surface 101B of the glass plate 10B. That is, the spacer 30 is provided in a range in which the heat reflective film 50 is formed in a plan view, and is provided on the first main surface 101A of the glass plate 10A and the first main surface 101B of the glass plate 10B. It is provided so as to be in contact with 50.

The spacer 30 is formed, for example, in a columnar shape. The diameter of the spacer 30 can be appropriately selected depending on the area of the main surfaces of the pair of glass plates 10A and 10B, and is, for example, 0.1 mm to 10 mm. The smaller the diameter of the spacer 30, the less noticeable it becomes. On the other hand, the larger the diameter of the spacer 30, the stronger it becomes. Further, the spacer 30 may be formed in a cylindrical shape.

The height of the spacer 30 can be appropriately selected depending on the size of the double glazing 1 for vehicles and the thickness and area of the main surfaces of the glass plates 10A and 10B, and is, for example, 10 μm to 1000 μm.

The plurality of spacers 30 are arranged in a substantially grid pattern in a plan view (see FIG. 1). The spacers 30 are preferably arranged at intervals of 10 mm to 100 mm, and specifically, can be arranged at intervals of 20 mm. The shape, size, number, spacing, and arrangement pattern of the spacer 30 are not particularly limited and can be appropriately selected. Further, the spacer 30 may be prismatic or spherical.

The spacer 30 can be formed by using a metal such as aluminum or stainless steel, an alloy, a resin, or the like, and it is preferable to use a polyimide resin as the resin.

By containing the polyimide resin, the spacer 30 has high heat resistance and can be strengthened, so that the vacuum space S can be formed more stably. That is, since the polyimide resin has high heat resistance, the spacer 30 can maintain its shape even when the temperature becomes high during the manufacture of the double glazing for vehicles 1. Further, since the polyimide resin is a strong polymer, the spacer 30 can receive the pressing force even when the pressing force is applied from the pair of glass plates 10A and 10B, and can secure a space between them.

Further, the spacer 30 can be made inconspicuous by containing a polyimide resin. Since the resin spacer 30 is subjected to pressing force from the glass plates 10A and 10B in the state of the vehicle double glazing 1, it tends to be slightly larger in the radial direction than the size before obtaining the vehicle double glazing 1. It is in. However, since the polyimide resin is a strong polymer, the proportion of the spacer 30 increasing in the radial direction is smaller than that in the case of forming the spacer 30 using another resin, and crushing can be less likely to occur, so that the spacer 30 can be made less noticeable. Further, since the polyimide resin has low light absorption, the transparency of the spacer 30 can be improved. Therefore, even if the spacer 30 is pushed and becomes larger in the radial direction, the spacer 30 can be made inconspicuous.

Further, the spacer 30 can improve the impact resistance by containing the polyimide resin. Since the polyimide resin has higher elasticity than the metal, it can absorb the pressing force applied to the glass plates 10A and 10B, and the impact resistance of the double glazing 1 for vehicles can be enhanced.

Further, since the spacer 30 contains the polyimide resin, the thermal conductivity is lower than that of the metal spacer, so that the heat insulating property of the double glazing 1 for vehicles can be enhanced.

Further, since the spacer 30 contains a polyimide resin, it has high light transmittance and improves the appearance of the double glazing for vehicles 1. That is, the polyimide resin has an absorption edge in which the absorption rate is lowered in the light absorption spectrum from ultraviolet rays to visible light. The absorption edge of the polyimide resin is 400 nm or less. The light absorption spectrum is represented by the transition of the change in the absorption rate with respect to the change in the wavelength in the graph in which the wavelength is on the horizontal axis and the absorption rate is on the vertical axis. Here, the absorption edge means a wavelength in which the absorption rate drops sharply when the wavelength becomes large (that is, when the wavelength changes from a short wavelength to a long wavelength) in the light absorption spectrum. The absorption end is, so to speak, the end portion of the portion having absorbency in the light absorption spectrum. Here, the range from ultraviolet rays to visible light may be in the wavelength range of 250 nm to 800 nm. When the absorption edge of the light absorption spectrum of the polyimide resin is 400 nm or less, light in the visible light region (for example, a wavelength of 400 nm to 800 nm) can be transmitted, so that the color of the spacer 30 becomes transparent and it becomes difficult to see from the outside. , The spacer 30 can be suppressed from being conspicuous. The polyimide resin is a polymer that is relatively easily colored (for example, it can be colored brown), but when the light absorption in the visible light region is reduced, the color becomes less noticeable. By making the spacer 30 inconspicuous, the double glazing 1 for vehicles not only improves the appearance of itself, but also makes it easier to see the object from one side to the other through the glass plates 10A and 10B. .. Therefore, if the double glazing 1 for a vehicle is applied to the window glass of the vehicle, the outside of the vehicle can be easily seen from the inside of the vehicle.

The spacer 30 can be manufactured by using a known manufacturing method, and can be formed by using, for example, at least one resin film. The resin film may be a resin sheet. The spacer 30 is obtained by cutting the resin film into a shape suitable for the double glazing 1 for vehicles. For example, the spacer 30 is obtained by punching a resin film to a predetermined size by punching or the like. The resin film cut out in this way is used as the spacer 30. When the spacer 30 is a laminated body, the spacer 30 can be composed of a laminated body of two or more resin films.

The spacer 30 preferably contains at least one polyimide film. Further, the spacer 30 may have a laminate including a plurality of polyimide films. When the spacer 30 contains at least one polyimide film, the formation of the spacer 30 becomes easy. When the spacer 30 is a laminated body, the spacer 30 can be composed of a laminated body of a polyimide film and another resin film.

The gas adsorbent 40 may be provided on any one or more of the first main surface 101A of the glass plate 10A, the first main surface 101B of the glass plate 10B, the inner peripheral surfaces of the sealing materials 20A and 20B, and the inside of the spacer 30. good. In the present embodiment, as shown in FIG. 2, the gas adsorbent 40 is provided in the vicinity of the sealing material 20A of the first main surface 101A of the glass plate 10A.

As the gas adsorbent 40, a normally used gas adsorbent can be used. As the gas adsorbent usually used, one containing a material that adsorbs water is preferable, and one containing calcium oxide, zeolite or the like is preferable. By installing the gas adsorbent 40 on the first main surface 101A of the glass plate 10A, the gas in the vacuum space S can be adsorbed, so that the degree of vacuum in the vacuum space S can be maintained and the heat insulating property can be improved.

The heat reflective film 50 is formed on the first main surface 101B of the glass plate 10B among the pair of glass plates 10A and 10B facing each other with the vacuum space S interposed therebetween. It is provided on the entire surface of the glass plate 10A except for the sealing materials 20A and 20B of the first main surface 101A and their vicinity. The heat-reflecting film 50 has a function of making it difficult for heat to be transferred in the thickness direction of the vehicle double glazing 1 and improving heat-shielding and heat-insulating properties.

Further, the heat reflective film 50 is formed on the first main surface 101B of the glass plate 10B and is in the vacuum space S, so that it is isolated from the atmosphere. Therefore, the heat-reflecting film 50 can be prevented from coming into contact with moisture in the atmosphere, and deterioration can be reduced.

As the heat reflective film 50, a Low-E (Low Emissivity) film or the like can be used. The Low-E film restricts the passage of heat by suppressing radiant heat transfer, and improves heat shielding and heat insulating properties. Further, the Low-E film may be a general one, and for example, an infrared reflective film is included between a pair of transparent dielectric films, and the transparent dielectric film, the infrared reflective film, and the transparent dielectric film are laminated in this order. Can be used as a laminated film. The infrared reflective film may be formed with one or more layers between the transparent dielectric films. Further, the transparent dielectric film may be formed from a plurality of layers. The thickness of the Low-E film may be appropriately set according to the required performance, the composition of the film, and the like.

As the transparent dielectric film having a heat-shielding property, a material such as a metal oxide or a metal nitride can be used. As the metal oxide, zinc oxide, tin oxide, titanium oxide, silicon oxide and the like can be used. The transparent dielectric film may be thinned in order to transmit light so as not to affect the transparency of the double glazing 1 for vehicles.

Since the infrared reflective film can block infrared rays incident on the vacuum space S side, the heat insulating property of the vehicle double glazing 1 is improved. As the infrared reflective film, a metal film or a semiconductor film can be used. Examples of the material for forming the metal film include Ag and the like. As the semiconductor film, fluorine-doped tin oxide can be used.

Examples of the method for forming a Low-E film include a dry coating method. Examples of the dry coating method include a PVD method and a CVD method. Examples of the PVD method include a vacuum vapor deposition method, a sputtering method, and an ion plating method, and the sputtering method is preferable because a film having excellent adhesion and flatness can be formed.

The heat reflective film 50 may be formed on the first main surface 101A of the glass plate 10A, or may be formed on both the first main surface 101A of the glass plate 10A and the first main surface 101B of the glass plate 10B. May be good.

The shielding portions 60A and 60B are provided on the main surface located outside the glass plates 10A and 10B. Specifically, the shielding portion 60A is provided on the peripheral edge portion of the second main surface 102A on the opposite side of the glass plate 10A from the first main surface 101A. Further, a shielding portion 60B is provided on the peripheral edge portion of the second main surface 102B on the opposite side of the glass plate 10B from the first main surface 101B. By forming the shielding portion 60B on the peripheral edge of the second main surface 102B of the glass plate 10B, it is possible to prevent the sealing material 20 from being exposed to sunlight, so that the sealing material 20 can be suppressed from being deteriorated by ultraviolet rays. Further, by forming the shielding portion 60A on the peripheral edge portion of the second main surface 102B of the glass plate 10B, it is possible to make it difficult to visually recognize the sealing material 20 from the inside of the vehicle. The shielding portions 60A and 60B may be provided with only one of the shielding portions 60A and 60B, or both may not be provided.

As the shielding portions 60A and 60B, for example, a dark opaque layer called "black ceramics" can be used. The shielding portions 60A and 60B can be formed by a known method. For example, black ceramic printing ink is applied to at least one of the second main surface 102A of the glass plate 10A and the second main surface 102B of the glass plate 10B. A film can be formed and the coating film can be baked to form.

As the shielding portions 60A and 60B, known non-ceramic layers that do not require baking can also be used. In this case, a shielding portion may be provided on the first main surface 101A of the glass plate 10A and the first main surface 101B of the glass plate 10B. The non-ceramic layer can be, for example, a double glazing having excellent weather resistance and aesthetics if it is a coating film used for a vehicle body. When the non-ceramic layer is used for the shielding portions 60A and 60B, either the shielding portion 60A or 60B may be used as the non-ceramic layer, but at least the shielding portion 60B is preferably a non-ceramic layer from the viewpoint of weather resistance and aesthetics. Further, when the shielding portions 60A and 60B are non-ceramic layers, it is preferable that the glass plates 10A and 10B are easily bent and molded into the same shape.

(Manufacturing method of double glazing for vehicles)
Next, a method for manufacturing the double glazing 1 for a vehicle according to the present embodiment will be described. The method for manufacturing the double-layer glass 1 for a vehicle includes a glass plate preparation step, a shielding portion forming step, an adhesive application step, a spacer placement step, a gas adsorbent installation step, and a glass plate facing each other. It includes a placement process, an adhesion process, and a processing process.

Hereinafter, each step will be described with reference to FIGS. 4 to 11. 4 to 11 are explanatory views showing a part of the process of the manufacturing method of the double glazing 1 for a vehicle according to the present embodiment.

(Preparation process for glass plate)
First, a glass plate 10A and a glass plate 10B molded into a desired shape and size are prepared. The glass plate 10A and the glass plate 10B are formed in a rectangular shape and have the same shape and size in a plan view. In addition, the same includes substantially the same.

(Process of forming the shielding part)
Next, black ceramic printing ink is applied to the entire circumference of at least one of the peripheral edges of the second main surfaces 102A and 102B of the glass plates 10A and 10B to form a coating film, and the coating film is baked to shield the glass plates 10A and 10B. Parts 60A and 60B (see FIG. 2) are formed. When the shielding portion 60A is formed on the second main surface 102A of the glass plate 10A, the black ceramic printing ink is applied while avoiding the through hole 11A of the glass plate 10A and its periphery, and other than the through hole 11A and its periphery. A shielding portion 60A may be formed in the region.

The coating film does not need to be completely baked at this stage, and may be completely baked in the process of convexly curving the glass plate.

Further, the black ceramic printing ink may be applied to the entire periphery of the peripheral edge portion of the second main surface 102A of the glass plate 10A to form the shielding portion 60B. In this case, the shielding portion 60A may be formed of a non-ceramic layer after the (processing step) described later.

After that, the glass plate 10A and the glass plate 10B are curved convexly toward the first main surfaces 101A and 101B to form a curved surface. Then, the glass plate 10A and the glass plate 10B are subjected to a strengthening treatment. When black ceramics are used as the shielding portions 60A and 60B, the baking process may be performed before the glass plate is curved or at the same time as the glass plate is curved.

After that, a heat reflective film 50 is formed on the first main surface 101A of the glass plate 10A by, for example, a laminating method or the like. The glass plate 10B may be further provided with a heat reflecting film as in the glass plate 10A.

The glass plate 10A has a through hole 11A penetrating in the thickness direction thereof. An exhaust pipe 12A is provided on the second main surface 102A of the glass plate 10A. In this case, the through hole 11A is connected to the flow path of the exhaust pipe 12A to form the exhaust hole 13.

The heat reflective film 50 may be formed on the glass plate 10A before the glass plates 10A and 10B are subjected to the strengthening treatment.

(Adhesive application process)
Next, as shown in FIG. 4, the glass adhesive 200 is applied onto the first main surface 101B of the glass plate 10B. The glass adhesive 200 contains at least two types of glass adhesives, and includes a first glass adhesive 200A and a second glass adhesive 200B.

As shown in FIG. 5, the first glass adhesive 200A is applied in a frame shape along the peripheral edge portion along the edge of the first main surface 101B of the glass plate 10B. The first glass adhesive 200A is continuously applied once along the edge of the first main surface 101B of the glass plate 10B.

As shown in FIG. 5, the second glass adhesive 200B is inside surrounded by the first glass adhesive 200A in a plan view, and has a short side closer to the short side of the first main surface 101B of the glass plate 10B. Apply in a straight line parallel to. The second glass adhesive 200B is applied so as to be connected to the first glass adhesive 200A applied to the long side of the first main surface 101B.

The first glass adhesive 200A and the second glass adhesive 200B are adhesives containing heat-meltable glass. The second glass adhesive 200B is a glass adhesive different from the first glass adhesive 200A. In this case, the second glass adhesive 200B can have the property of being integrated with the first glass adhesive 200A when the glass composite 2 described later is heated.

In the adhesive coating step, after applying the glass adhesive 200, temporary firing may be performed. By performing tentative firing, the glass adhesive 200 may be fixed on the first main surface 101B of the glass plate 10B. As a result, the adhesive strength of the glass adhesive 200 is enhanced, and the state in which the glass adhesive 200 adheres to the first main surface 101B can be maintained. Therefore, the glass adhesive 200 is scattered by the exhaust during the exhaust step described later. Can be suppressed. The tentative firing is preferably performed at a temperature lower than the melting temperature of the glass adhesive 200.

(Spacer placement process)
Next, as shown in FIG. 6, a plurality of spacers 30 are arranged on the heat reflective film 50 provided on the first main surface 101B of the glass plate 10B. The plurality of spacers 30 may be arranged on the first main surface 101A of the glass plate 10A. Further, the spacers 30 may be arranged at equal intervals or irregularly, and in the present embodiment, as shown in FIG. 7, they may be arranged at substantially equal intervals in a grid pattern. The spacer 30 can be formed by a known thin film forming method, and when the spacer 30 is made of a film, the film can be punched out to a predetermined size in advance to form the spacer 30. The spacer 30 can be arranged by using a known means such as a chip mounter.

The spacer placement step may be performed at the same time as the adhesive application step, but the spacer placement step may be performed after the adhesive application step. This is because the spacer 30 can be easily arranged on the first main surface 101B by first applying the glass adhesive 200 to the first main surface 101B of the glass plate 10B.

The spacer 30 can be formed by using at least one resin film, and preferably includes at least one polyimide film. When the spacer 30 is formed of a laminated body containing a plurality of resin films, it is preferable that the plurality of resin films are laminated and adhered in advance. The resin film contained in the laminate may be adhered with an adhesive, may be adhered by the adhesiveness of the resin film itself, or the resin film may be adhered by an electrostatic force.

(Installation process of gas adsorbent)
Next, as shown in FIG. 8, the gas adsorbent 40 is placed on the first main surface 101A. The gas adsorbent 40 is provided in the vicinity of the positions where the first main surface 101A of the glass plate 10A comes into contact with the sealing materials 20A and 20B. The method for installing the gas adsorbent 40 is not particularly limited, and the gas adsorbent 40 may be fixed to the first main surface 101A of the glass plate 10A, and the fluid gas adsorbent material may be the first of the glass plate 10A. It may be installed on the main surface 101A, dried and installed on the first main surface 101A of the glass plate 10A.

(Glass plate facing arrangement process)
Next, as shown in FIG. 9, the first main surface 101A of the glass plate 10A faces the first main surface 101B of the glass plate 10B, and the glass plate 10A is placed on the first main surface 101B of the glass plate 10B. Place on the glass adhesive 200 applied to. As a result, the glass plate 10B is supported by the spacer 30 and is arranged above the glass plate 10A, and is a glass composite 2 containing the glass plate 10A, the glass plate 10B, the glass adhesive 200, the spacer 30, and the gas adsorbent 40. Is formed. The glass composite 2 has an internal space S1 between the glass plate 10A and the glass plate 10B. In the glass composite 2, the glass adhesive 200 is not cured.

(Adhesion process)
After that, as shown in FIG. 10, the first glass adhesive 200A and the second glass adhesive 200B are cured to form a sealing material 20A made of a cured product of the first glass adhesive 200A and a second glass adhesive 200B. The sealing material 20B is formed, and the glass plate 10A and the glass plate 10B are bonded with the sealing materials 20A and 20B (adhesion step).

The sealing material 20A adheres the peripheral edge portion of the glass plate 10A and the peripheral edge portion of the glass plate 10B, and the sealing material 20B has main surfaces located near one of the short sides of the glass plates 10A and 10B along the short side. A vacuum space S is formed by the glass plate 10A, the glass plate 10B, and the sealing materials 20A and 20B. As a result, the composite substrate 3 is formed.

The bonding step includes a heating step and an exhaust step. In the bonding step, the heating step and the exhaust step may be performed at the same time, or the heating step may be performed after the exhaust step. In the present embodiment, in the bonding step, the heating step and the exhaust step are performed at the same time.

((Heating process))
In the heating step, the glass composite 2 is placed in a heating furnace or the like and heated. The glass adhesive 200 can be heated by heating the glass composite 2. As a result, the glass in the glass adhesive 200 is melted, and the adhesiveness can be exhibited in the glass adhesive 200. The melting temperature of the glass contained in the glass adhesive 200 exceeds, for example, 300 ° C. The melting temperature of such glass may exceed 400 ° C. However, the lower the melting temperature of the glass contained in the glass adhesive 200, the easier it is to melt the glass in the glass adhesive 200 in the heating step. Therefore, the melting temperature of the glass is preferably 400 ° C. or lower, more preferably 360 ° C. or lower, further preferably 330 ° C. or lower, and particularly preferably 300 ° C. or lower.

The heating step preferably comprises two or more steps. For example, the heating step includes a first heating step of heating the inside of the furnace to melt the glass contained in the first glass adhesive 200A and a heating step of further heating the inside of the furnace to melt the glass contained in the second glass adhesive 200B. It can include a second heating step of causing.

In the first heating step, the glass in the first glass adhesive 200A melts at a lower temperature than the glass in the second glass adhesive 200B. That is, the glass in the first glass adhesive 200A melts before the glass in the second glass adhesive 200B. In the first heating step, the glass in the first glass adhesive 200A is melted, and the glass in the second glass adhesive 200B is not melted. When the glass in the first glass adhesive 200A is melted, the first glass adhesive 200A adheres to the glass plate 10A and the glass plate 10B.

The temperature at which the glass in the first glass adhesive 200A melts and the glass in the second glass adhesive 200B does not melt is defined as the first melting temperature. At the first melting temperature, the glass in the second glass adhesive 200B does not melt, so that the shape of the second glass adhesive 200B is maintained.

In the second heating step, the glass composite 2 is further heated to melt the glass in the second glass adhesive 200B. The temperature of the second heating step is set to a second melting temperature higher than the first melting temperature. The second melting temperature is, for example, a temperature 10 ° C. to 100 ° C. higher than the first melting temperature.

At the second melting temperature, the glass in the second glass adhesive 200B melts. As a result, the second glass adhesive 200B heated at the second melting temperature can be deformed to close the gap (vent) provided between the second glass adhesive 200B and the glass plate 10A. , The glass plate 10A and the glass plate 10B can be adhered to each other.

((Exhaust process))
Next, as shown in FIG. 11, the gas between the glass plate 10A and the glass plate 10B is exhausted to form a vacuum space S in which the spacer 30 is provided inside.

In the exhaust process, the air in the internal space S1 is exhausted through the ventilation path. The exhaust step can be carried out by a vacuum pump or the like connected to the exhaust hole 13. In this case, the vacuum pump is connected to a pipe extending from the exhaust pipe 12A. By the exhaust step, the internal space S1 is depressurized and the vacuum space S is formed. The exhaust method may be a method other than the method using a vacuum pump. For example, the glass composite 2 may be installed in the chamber and the inside of the chamber may be depressurized and exhausted.

In FIG. 11, the gas in the internal space S1 is exhausted downward to the outside through the exhaust hole 13. The arrow in FIG. 11 indicates the flow of gas in the internal space S1. The second glass adhesive 200B is provided so as not to come into contact with the first main surface 101A of the glass plate 10A, and the gap between the second glass adhesive 200B and the first main surface 101A forms a ventilation path, so that an internal space is formed. The gas in S1 is discharged from the exhaust hole 13 through the ventilation path. As a result, the internal space S1 becomes the vacuum space S (see FIG. 10).

The glass adhesive 200 may have a property that the glass in the glass adhesive 200 is melted, that is, the heat-meltable glass is softened by heat, so that the glass can be deformed or bonded. In this case, it is preferable that the glass adhesive 200 (particularly the first glass adhesive 200A) does not have the fluidity to flow out of the glass composite 2 during the heating step.

After forming the vacuum space S, the composite substrate 3 is cooled and the exhaust process is stopped. Since the vacuum space S is sealed by the cured product of the glass adhesive 200, the vacuum space S is maintained even if the exhaust process is eliminated. However, for safety reasons, it is preferable to stop the exhaust process after cooling the composite substrate 3.

In the bonding step, when the heating step and the exhaust step are performed at the same time, the exhaust step may be performed from the middle of the heating step. For example, after the temperature in the first stage reaches the first melting temperature, the exhaust step is started and the gas in the internal space S1 (see FIG. 11) is discharged. Then, the second heating step is performed while performing the exhaust process. While the second glass adhesive 200B is deformed into the sealing material 20B in the second heating step, the gap between the second glass adhesive 200B and the first main surface 101A is closed, and the internal space S1 is passed through the sealing material 20B. It is completely divided into two spaces. Of the two spaces, the space without the through hole 11A is the vacuum space S sealed by the glass plate 10A, the glass plate 10B, and the sealing materials 20A and 20B. As a result, as shown in FIG. 9, the composite substrate 3 having the vacuum space S can be obtained.

When the exhaust step is performed from the middle of the heating step, the exhaust step may be performed after the temperature is lowered to a temperature lower than the first melting temperature (exhaust start temperature). Further, if the shape of the glass composite 2 (particularly the first glass adhesive 200A) is not disturbed, the exhaust may be started before the first melting temperature is reached.

When the exhaust step is performed from the middle of the heating step, it is preferable that the second heating step is performed after the degree of vacuum of the internal space 500 reaches a predetermined value and the vacuum space S is maintained.

When the exhaust step is performed from the middle of the heating step, the exhaust step may be continuously performed when the temperature of the glass composite 2 is raised to a temperature suitable for the second heating step.

After forming the composite substrate 3, the exhaust process is stopped to cool the composite substrate 3. Since the vacuum space S is sealed by the sealing material 20A and the sealing material 20B, the degree of vacuum in the vacuum space S is maintained. The exhaust process may be stopped after the composite substrate 3 is cooled.

(Processing process)
Finally, if necessary, the composite substrate 3 is processed into a predetermined shape and cut along the cutting line CL (see FIG. 10) of the composite substrate 3, so that the double glazing 1 for a vehicle having the above configuration is obtained. (See FIG. 2) is obtained. The composite substrate 3 may be used as the double glazing for vehicles 1 without being processed or cut.

In the method for manufacturing the double glazing 1 for vehicles according to the present embodiment, the glass adhesive 200 is applied directly on the glass plate 10B, but it may be applied directly on the glass plate 10A. Further, after the glass plate 10A and the glass plate 10B are arranged to face each other, the glass adhesive 200 may be injected into the gap between the glass plate 10A and the glass plate 10B. In this case, the glass adhesive 200 can be arranged in contact with both the glass plate 10A and the glass plate 10B at the same time as the injection.

In the present embodiment, the bonding step may be an exhaust step from the middle of the heating step. For example, after the temperature reaches the melting temperature, the exhaust process is started and the gas in the internal space S1 is discharged. In this case, the exhaust step may be performed after the temperature is lowered to a temperature lower than the melting temperature (exhaust start temperature). If the shape of the glass composite 2 (particularly the glass adhesive 200) does not collapse, exhaust may be started before the melting temperature is reached.

In the present embodiment, the adhesive application step may be performed after the spacer placement step or the gas adsorbent installation step.

As described above, the double glazing 1 for a vehicle according to the present embodiment includes a pair of glass plates 10A and 10B, a sealing material 20, and a spacer 30, and the main surfaces of the glass plates 10A and 10B are unidirectional. It has a curved surface that is curved in a convex shape, and the thickness of the glass plates 10A and 10B is 2.1 mm or more and less than 3.0 mm. Since the glass plates 10A and 10B have appropriate rigidity, when the glass plate 10A and the glass plate 10B are bonded to each other via the sealing material 20, the degree of curvature of the main surface of the glass plate 10A and the glass plate 10B is different. However, the glass plates 10A and 10B can be bent to adjust to the same degree of curvature. Therefore, the glass plate 10A and the glass plate 10B can be reliably sealed with the sealing material 20. Therefore, the double glazing 1 for a vehicle can be reduced in weight while having high heat insulating performance.

When a laminated glass is produced by laminating a pair of glass plates via a sealing material, if there is a difference in the degree of curvature between one glass plate and the other glass plate, the thickness of the glass plate. When is 3.0 mm or more, the rigidity of the glass plate is high and the glass plate hardly bends, so that it is difficult to adjust the deviation of the pair of glass plates with the sealing material and seal the glass plate so as not to form a gap. In particular, when applied to vehicles, if the glass plates are thick, even if the two glass plates are curved and sealed in a state of facing each other, if the glass plates are thick, the degree of curvature of the two glass plates is high. It is difficult to match and it is difficult to obtain a high degree of airtightness between the glass plates. Further, since the laminated glass has two glass plates, if two glass plates having a thickness of 3.0 mm or more are used, the laminated glass becomes heavier, which causes deterioration of the fuel efficiency of the vehicle. On the other hand, the double glazing 1 for a vehicle has a main surface (first main surface 101A and second main surface 102A) of the glass plate 10A and a main surface (first main surface 101B and second main surface 102B) of the glass plate 10B. Even if the degree of curvature is different, it can be easily sealed with the sealing material 20 while adjusting the degree of curvature, and the weight can be reduced.

In the double glazing 1 for vehicles, the thickness of the glass plates 10A and 10B can be made 2.1 mm or more and less than 3.0 mm. This makes it easier to bend the glass plates 10A and 10B to adjust the degree of curvature to the same degree, so that the glass plate 10A and the glass plate 10B can be more reliably sealed with the sealing material 20.

In the double glazing 1 for vehicles, the thicknesses of the glass plates 10A and 10B can be the same. As a result, the glass plates 10A and 10B can be bent to have the same degree of curvature, so that the glass plate 10A and the glass plate 10B can be more reliably sealed with the sealing material 20.

In the double glazing 1 for vehicles, the minimum value of the radius of curvature of the glass plates 10A and 10B can be set to 500 mm to 100,000 mm. Thereby, the glass plates 10A and 10B can be easily adjusted to a curved shape along the shape of the window glass of the vehicle or the like. Therefore, the double glazing 1 for vehicles surely has high heat insulating performance even if the glass plates 10A and 10B are curved with the above-mentioned radius of curvature.

In the double glazing 1 for vehicles, at least one of the glass plates 10A and 10B can be made of tempered glass. The glass plates 10A and 10B are strengthened to have a compressive stress layer in a region from the surface to a predetermined depth. As a result, the mechanical strength of the surfaces of the glass plates 10A and 10B can be increased, and even if the glass plates 10A and 10B are cracked, they can be finely crushed and scattered in the vehicle can be reduced, so that the safety can be enhanced. Therefore, the double glazing 1 for a vehicle can be made into a glass for a vehicle with high safety.

In the double glazing 1 for vehicles, the glass plates 10A and 10B can be made into tempered glass. As a result, the double glazing 1 for vehicles can be made into glass for vehicles with higher safety.

The double glazing 1 for vehicles can have a heat reflecting film 50 on the first main surface 101B of the glass plate 10B. As a result, the double glazing 1 for vehicles can improve the heat shielding property and the heat insulating property, so that the heat of the sealing material 20, the spacer 30, the gas adsorbent 40 and the heat reflecting film 50 provided between the glass plates 10A and 10B Deterioration due to

The vehicle double glazing 1 can have shielding portions 60A and 60B on the peripheral edges of the second main surfaces 102A and 102B. As a result, the double glazing 1 for vehicles can suppress deterioration due to ultraviolet rays and can have a good appearance.

The double glazing 1 for vehicles may include a non-ceramic layer in the shielding portions 60A and 60B. Thereby, the double glazing 1 for a vehicle can have better weather resistance and aesthetics.

As described above, the double glazing 1 for vehicles can exhibit excellent heat insulating performance even when vibrated, and therefore can be suitably used for electric vehicles, fuel cell vehicles and the like, which require glass having high heat insulating properties. ..

(Modification example)
In the present embodiment, the double glazing 1 for vehicles may be formed by forming a pair of glass plates 10A and 10B with a pair of laminated glass plates. FIG. 12 is a cross-sectional view showing another example of the configuration of the double glazing for a vehicle 1. As shown in FIG. 12, the double glazing 1 for a vehicle includes a glass plate 10A, glass plates 10A-1 and 10A-2, and an adhesive layer (intermediate film) 70, and the glass plate 10A-1 and the glass plate. It is a laminated glass in which an interlayer film 70 is arranged between 10A-2 and 10A-2. The glass plate 10B is a laminated glass including the glass plates 10B-1 and 10B-2 and the interlayer film 70, and the interlayer film 70 is arranged between the glass plate 10B-1 and the glass plate 10B-2. As a result, the double glazing 1 for vehicles can obtain higher strength.

The glass plate 10A can be formed by arranging an interlayer film 70 between the glass plate 10A-1 and the glass plate 10A-2 and pressing and / or heating. The glass plate 10B can be formed by arranging an interlayer film 70 between the glass plate 10B-1 and the glass plate 10B-2 and pressing and / or heating.

The interlayer film 70 may be any material as long as it can join the main surfaces of the glass plate 10A-1 and the glass plate 10A-2 and the main surfaces of the glass plate 10B-1 and the glass plate 10B-2 to each other, as long as it is ethylene vinyl. Acetal, polyvinyl butyral, ethylene-vinyl acetate copolymer (EVA), polyurethane, cycloolefin polymer (COP), ethylene-ethyl acrylate copolymer resin and the like can be used. Further, the resin composition containing the modified block copolymer hydride described in Japanese Patent No. 6065221 may be used.

In the present embodiment, the double glazing 1 for a vehicle includes a pair of glass plates 10A and 10B, but three or more glass plates may be provided so that their main surfaces face each other via a spacer 30 or the like. ..

Hereinafter, embodiments will be described in more detail with reference to examples, but the embodiments are not limited to these examples. Examples 1 to 3 are examples, and examples 4 and 5 are comparative examples.

<Example 1>
[Making double glazing]
Prepare two glass plates (soda lime glass) with a thickness of 2.8 mm and the same size (300 mm x 300 mm). A black ceramic layer is formed on one of the glass plates. A through hole for exhaust is formed inward by 10 mm or more in the surface direction from the peripheral edge of the glass plate on which the black ceramic layer is formed. Further, in the other glass plate, the glass particle paste is arranged in the peripheral portion of one of the main surfaces. After that, the two glass plates are physically strengthened to obtain air-cooled tempered glass. The radius of curvature of the two obtained glass plates is 21000 mm to 24000 mm in the horizontal direction (longitudinal direction) and 1400 mm to 1500 mm in the direction perpendicular to the horizontal direction (short direction). The composition of the glass plate and the conditions for physical strengthening are as follows.
(Glass plate)
-Glass composition: SiO ₂ is 69.8 wt%, Al ₂ O ₃ is 1.8 wt%, Na ₂ O is 13.2 wt%, Ca O is 8.5 wt%, Mg O is 4.5 wt%, and K ₂ O is 0. It is 0.8 wt%, CoO is 247 ppm, Se is 30 ppm, and Cr ₂ O ₃ is 61 ppm.
(Conditions for physical strengthening)
-The glass plate is heat-molded at a temperature of 550 ° C to 700 ° C, and then blown with wind to quench it to a temperature of 500 ° C or lower within a time of several seconds to several tens of seconds.

Then, the glass plate having the through holes formed is used as the inner glass, the glass plate on which the glass particle paste is arranged is used as the outer glass, and the inner glass and the outer glass are washed with ion-exchanged water and a brush.

After that, the spacer is placed on the outer glass. Further, after applying the gas adsorbent to a part of the main surface of the inner glass, a sealing material is applied to the vicinity of 10 mm from the peripheral edge of the surface to which the gas adsorbent of the inner glass is applied, and the gas adsorbent of the inner glass is applied. Apply the encapsulant to the vicinity of 50 mm from one short side of the coated surface, and temporarily dry it. After that, the main surface on which the outer glass spacer is installed is installed on the inner plate glass encapsulant, and the main surface on which the inner plate glass encapsulant is installed and the outer plate glass spacer are installed. Laminates so that the surfaces face each other, and a laminate in which a spacer, a gas adsorbent, and a sealing material are sandwiched between the inner glass and the outer glass is produced.

An exhaust pipe connected to a vacuum pump is connected to the exhaust through hole of this laminate, and the laminate is heated at 200 ° C to 250 ° C while depressurizing from the exhaust pipe to cure the sealing material and to form a sealing material. At the same time as forming, a gas adsorbent is formed. After that, the air inside the laminate is discharged while further heating the laminate at 210 ° C to 280 ° C. Then, the vacuum pump is stopped to cool the laminated body, and then the portion of the outer peripheral side of the laminated body including the through hole for exhaust is cut and the cut surface is processed to obtain the laminated glass.

[evaluation]
The thermal transmission rate and safety of the obtained laminated glass are evaluated.

(Thermal transmission rate)
The thermal transmissivity of the laminated glass is measured based on JIS-R3107.

(safety)
According to the JIS R3211 method (automobile safety glass test method) (2015) and the JIS R3212 method (automobile safety glass test method), the state of the fragments when the tempered glass is broken is as follows (1) to (3). Make sure that it meets the requirements. When (1) to (3) are satisfied, it is judged that the glass is a good laminated glass having high safety as an automobile safety glass, and is evaluated as ◯. If any one or more of (1) to (3) is not satisfied, it is judged that the laminated glass is not highly safe as automobile safety glass, and is evaluated as x.
(1) (a) The number of fragments in a 50 mm × 50 mm square area is 40 or more and 450 or less. (B) When the number of fragments in the 50 mm × 50 mm square area is less than 40, the number of fragments in the 100 mm × 100 mm square area including the portion is 160 or more.
(2) The number of fragments exceeding 3 cm ² is 3 or less, and 1 or less in a circle with a diameter of 100 mm.
(3) No more than 5 elongated pieces with a length of more than 75 mm and a length of 150 mm or less. The elongated debris reaching the periphery of the laminated glass is 45 degrees or less with respect to the side, and its length is 75 mm or less.

It is assumed that (1) satisfies either (a) or (b).

<Examples 2 to 5>
In Example 1, the same procedure as in Example 1 is performed except that the thicknesses of the two glass plates are changed.

As shown in Table 1, in Examples 1 to 3, the thermal transmissivity is 2.1 W / (m ² K) to 2.5 W / (m ² K), and the safety evaluation is also good. On the other hand, in Example 4, the thermal transmissivity is 3.5 W / (m ² K), which is high. In Example 5, the safety evaluation is poor. Therefore, in Examples 1 to 3, unlike Examples 4 and 5, the thickness of the glass plate is set to 2.1 mm to 2.8 mm, so that even if the main surface is curved, high heat insulation performance and safety are achieved. It can be said that it can be effectively used as a glass for vehicles because it can be made lightweight while having the above.

As described above, the embodiments have been described, but the above embodiments are presented as examples, and the present invention is not limited to the above embodiments. The above embodiment can be implemented in various other embodiments, and various combinations, omissions, replacements, changes, etc. can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 Insulated glazing for vehicles 10A, 10B Glass plate 20 Sealing material 30 Spacer 40 Gas adsorbent 50 Heat reflective film 60A and 60B Shielding part

Claims (10)

A pair of glass plates placed facing each other,
A sealing material that seals the peripheral edges of the pair of glass plates, and
A spacer placed between the pair of glass plates and
Equipped with
The pair of glass plates has a curved surface whose main surface is curved in one direction.
A double glazing for a vehicle in which the thickness of at least one of the pair of glass plates is 2.1 mm or more and less than 3.0 mm. The double glazing for a vehicle according to claim 1, wherein the pair of glass plates has a curved surface whose main surface is curved in two directions. The double glazing for vehicles according to claim 1 or 2, wherein the thickness of both of the pair of glass plates is 2.1 mm or more and less than 3.0 mm. The double glazing for a vehicle according to any one of claims 1 to 3, wherein the pair of glass plates have the same thickness. The double glazing for a vehicle according to any one of claims 1 to 4, wherein the minimum value of the radius of curvature of the glass plate is 500 mm to 100,000 mm. The double glazing for vehicles according to any one of claims 1 to 5, wherein at least one of the pair of glass plates is tempered glass. The double glazing for vehicles according to claim 6, wherein both of the pair of glass plates are tempered glass. The double glazing for a vehicle according to any one of claims 1 to 7, which has a heat reflecting film on at least one of the main surfaces of the pair of glass plates on the opposite surface side. The pair of glass plates according to any one of claims 1 to 8, wherein the pair of glass plates has a shielding portion for concealing the sealing material on at least one peripheral portion of two main surfaces opposite to the surface facing the pair of glass plates. The double glazing for vehicles according to the first paragraph. The double glazing for a vehicle according to claim 9, wherein the shielding portion includes a non-ceramic layer.

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