JP2001180986A - Low pressure double glazing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low pressure double glazing in which spacers laid in the gap between two sheet glasses are held stationarily. SOLUTION: This double glazing is constructed by forming a thin layer of a low melting glass on either side of a pair of sheet glasses facing inside, and adhering microspacers laid interspersed with the thin layer by melting of the low melting glass resulting in prevention of the microspacers from moving around during the use.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the field of energy saving in the field of construction such as housing and non-residential, the field of transportation of automobiles, vehicles, ships, aircrafts, etc., and the field of equipment such as freezers, freezer showcases, constant temperature and humidity chambers. The present invention relates to a low-pressure double glazing having high heat insulating performance applied to an opening that requires the following.

[0002]

2. Description of the Related Art In recent years, in order to create a comfortable and healthy living environment with excellent energy saving, double glazing having heat insulation performance has been used more frequently than ever before and has been rapidly spreading.

[0003] As this double-glazed glass, a low-pressure double-glazed glass in which the internal space formed by opposing plate glass is reduced in pressure has been proposed.

[0004] In order to reduce the internal space of the double-glazed glass to provide heat insulation, the pressure should be 10 Pa or less, preferably 1 Pa or less.
It is necessary to reduce the pressure to Pa or less. When the internal space is decompressed, atmospheric pressure is applied to the sheet glass, and the glass is broken. To prevent breakage, microspacers must be provided at appropriate intervals in the internal space.

[0005] By the micro-spacer, the sheet glass constituting the low pressure double glazing can maintain a predetermined interval even when the internal space is depressurized. However, the thickness of the internal space formed by the plate glass cannot be constant due to the variation in the thickness of the plate glass or the deformation of the micro spacer due to the atmospheric pressure applied through the plate glass.

Accordingly, the weight of the atmospheric pressure applied to the microspacer cannot be all the same, and the microspacer disposed at a portion where the thickness of the internal space is equal to or greater than the thickness of the microspacer is simply held between the glass sheets. Just
Because it is not restricted by atmospheric pressure, it often moves from a predetermined position due to vibration or impact. Furthermore, it may fall down between the glass sheets. When the microspacers move, the arrangement of the microspacers becomes irregular, the appearance is impaired, the variation in the stress state of the sheet glass increases, and the strength decreases.

[0007] Japanese Patent Publication No. 5-501896, Japanese Patent Publication No. 7-50
In 8967, instead of simply holding the micro-spacer between the glass plates, the metal of the micro-spacer is wrapped with low-melting glass and heated to melt this low-melting glass, and attach the micro-spacer to the glass plate. It is described that it is fixed.

However, in this method, since both ends of the micro-spacer are bonded to the glass plate, when the double-layer glass is bent indoors or outdoors by wind pressure or the like, the behavior of the two glass plates is not the same. There is a problem that stress is generated in the low-melting glass fixing the spacer, and the low-melting glass is broken and dropped during long-term use.

In view of the above problems, JP-A-11-209149 discloses that one end face of a micro-spacer is coated with a low-melting indium metal having good adhesion to glass, and the one end of one of the two glass sheets is heated by heating. To solve the aforementioned problems. However, the microspacers used for low-pressure double glazing are very small in size, for example, cylindrical with a diameter of 0.5 mm and a height of 0.2 mm, so that only the indium metal-coated surface of the microspacer has a low melting point. It is difficult to arrange on the glass sheet in the same direction as the glass coating surface. In addition, the use of injume is costly.

[0010]

SUMMARY OF THE INVENTION In a low pressure double glazing in which a large number of micro spacers are interspersed in a low pressure space of two glass sheets, it is possible to stabilize the fixing of the micro spacers for a long time and to prevent the movement. This is a major problem in maintaining a good appearance and maintaining strength for a long period of time, and a low-pressure double-glazing that can actually solve this problem has not yet been proposed.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a low-pressure double glazing which can prevent the movement of the micro spacer and can solve the above-mentioned problems. That is, the present invention
Two sheets of glass are spaced at a predetermined interval, and this interval is held by micro spacers arranged in a dotted manner, and the peripheral edge of the panel is sealed with a sealing material to form a low pressure space. In the double-glazed glass, a low-melting glass thin film is coated on at least a portion of the entire low-pressure space side of one of the pair of glass sheets on the low-pressure space side where the micro-spacers are arranged. A low-pressure double glazing characterized by being fused with an existing micro spacer.

Further, the softening temperature of the low-melting glass coated on the portion where the microspacer is to be disposed is higher than the softening temperature of the peripheral sealing glass, and the thickness of the thin film of the low-melting glass is interspersed. 0.01 of thickness
-20%, characterized in that the low-melting glass is transparent.

Since the microspacer is adhered to the glass sheet at only one end, even if a bending stress is generated in the low-pressure double-glazed glass, the adhesion is not broken unlike the conventional case where both ends are adhered. In addition, the thin film coated on the plate glass facilitates adhesion of the microspacer to the plate glass.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Two sheets of glass are clear float glass, glass with a low radiation film, heat absorbing glass, heat reflecting glass, high performance heat reflecting glass, wire entering glass, net entering glass, mold glass, and the like. Various types of plate glass such as tempered glass, double-strength glass, low-reflection plate glass, high transmission plate glass, ground glass, tapesti (frost) glass, ceramics printed glass, and laminated glass can be appropriately combined. A coating of a thin film of melting glass is formed in advance.

The thin film of the low-melting glass is preferably a transparent film, but may be translucent or opaque depending on the purpose of use. Also, it may be colored.

The softening temperature of the low-melting glass is set to be equal to or higher than the softening temperature of the peripheral sealing glass. When the glass peripheral portion is sealed, the low-melting glass fixing the micro-spacer is softened, and the micro-spacer becomes soft. It is desirable not to move.

Further, it is desirable that the thickness of the thin film of the low melting point glass is not more than 20% of the thickness of the micro spacers scattered. The reasons are as follows. As the micro-spacer, a metal micro-spacer, usually a stainless steel micro-spacer is used because of its strength, workability, and ductility. Ceramic and glass micro-spacers are not unbearable due to their strength and workability, but because of their brittleness they are not ductile, so the spacers are weak in strength and the low-pressure double glazing often breaks. However, the use of glass micro-spacers is not practically desirable. If the low-melting glass thin film is too thick in order to fix the microspacer, the thin film acts as a spacer, and the weakness of the glass tends to be weak due to the brittleness of the glass, which is not preferable. Therefore, the thickness of the low-melting glass thin film is set to 20% or less, preferably 10% or less of the thickness of the micro spacer. On the other hand, if the lower limit of the thickness is too small, there is a problem in the adhesiveness to the microspacer.

The low-melting glass thin film may be formed by printing a paste of glass powder by a screen method, a chemical vapor deposition method, a physical vapor deposition method, or the like. The spacers are locally coated at interspersed positions.

The microspacer for maintaining the interval between the two glass sheets is not particularly limited as long as it has a lower hardness than glass and has an appropriate compressive strength, but metals, alloys, and steels are preferable. For metals, alloys such as iron, cobalt, and titanium are used, and for steel, stainless steel is used.

The micro-spacers are spherical, cylindrical, prismatic, etc., for example, in a grid pattern with a spacing of 100 mm.
Below, preferably 75 mm or less. The arrangement of the spacers may be regular or irregular as long as it is within the range of the arrangement interval.

The micro-spacers arranged on the low-melting glass thin film are heat-sealed and firmly adhered to the glass plate. This step of heat-sealing may be performed before assembling the multilayer glass cell, or may be performed simultaneously with the step of heat-sealing the periphery of the multilayer glass cell.

In order to evacuate the internal space to one or more places of either of the two glass sheets, a diameter of 2 mm or more and 9 mm
Provide an opening within φ. The position of this opening is preferably within 75 mm x 75 mm from the glass corner, so that when the double glazing fits inside the sash, it is within the window from the corner of the sash closest to the window.

Of course, the two sheets of glass may have the same size. However, as different sizes, the small glass may be shorter by 2 to 6 mm on each side than the large glass, so that the low melting point solder glass as a sealing material is used. This is preferable because it facilitates the penetration into the two sheet glasses.

Further, it is preferable that the edges of the two sheet glasses are chamfered by mechanical polishing, laser or the like.

A low melting point solder glass is used as a sealing material to an exhaust port provided in the sheet glass, and an exhaust tube is connected. The exhaust tube is preferably made of glass such as soda-lime glass and lead glass, but is not particularly limited as long as it has a thermal expansion coefficient substantially equal to that of the low melting point solder glass. It is preferable that the shape of the exhaust tube is circular, the inner diameter is 1.5 mmφ or more, and the outer diameter is 9 mmφ or less. This is processed into an L-shape and installed in the above-mentioned opening, and the side not fitted in the opening of the exhaust tube pipe is arranged on the corner side, and the exhaust tube and the plate glass are fixed and sealed with low melting point solder glass. .

It is preferable that the corner of the sheet glass having the opening is cut obliquely between the corner and the opening in a plan view, since the tip of the exhaust tube tube can be easily cut off.

Pairing is performed with another glass sheet via a micro spacer. The distance between the two glass sheets is 0.0
5 mm or more, 2.0 mm or less, 0.1 mm or more,
1.0 mm or less is preferable.

The low melting point solder glass used as a sealing material at the peripheral edge of the panel is a glass powder alone, a glass frit obtained by mixing a glass powder and a ceramic powder, and a paste in which the glass frit is dispersed in a vehicle such as aluminum acetate. And those processed as wire rods such as glass rods, the composition of which is, for example, lead silicate glass or lead borosilicate glass alone and those containing refractory fillers or the like, or does not contain lead Examples include phosphate glass containing a refractory filler or the like.

The pressure in the sealed low-pressure space between the two glass sheets is 10 Pa or less, preferably 1 Pa or less.

To protect the exhaust tube tube and the cut portion, the exhaust corner is protected by a resin or metal cap. At this time, it is preferable that the protrusion from the glass surface be within 10 mm of the height from the glass surface, since there is no problem in opening and closing the window. Further, it is more preferable that the portion protruding from the glass surface is outside the frame of the sash at the time of applying the glass.

[0031]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows Embodiments 1 and 2 of this embodiment.
It is a perspective view of. Embodiment 1 FIG. 2 shows a section taken along the line aa ′ of FIG. 1 in this embodiment. 2
Each of the sheet glasses 2 and 3 is 3 mm in thickness, and the size of the large glass 2 is a float sheet glass of 1040 mm × 1040 mm, and the size of one small glass 3 is 1034 mm.
4 × 1034 mm float glass sheet, as shown in FIG.
The exhaust opening 4 of mmφ is machined, and all the glasses have the corners of the rectangular apex part obliquely in plan view at a position 29 mm from both sides in the direction of the large glass, and the small glass from the apex with holes Cut diagonally in a plan view at a position of 26 mm in both side directions.

The large glass 2 is coated with a low emissivity film having a vertical emissivity of 0.1 on the low pressure space side.

In the small glass 3, SiO ₂ (2% by weight), B ₂
O ₃ (19% by weight), ZnO (3% by weight), PbO (7%
Low-melting glass powder having a composition of 6% by weight and a softening temperature of 410 ° C. is added to a binder containing butyl carbitol acetate, α-terpineol and cellulose to prepare a paste, and the peripheral portion is formed by screen printing technology. Apply to the entire glass except for the width of 5mm from the edge,
A low-melting glass thin film 5 was formed. SUS430 cylindrical micro spacer 6 with 0.5mmφ and 0.2mm height
Are arranged on the thin film 5 at a pitch of 2 cm × 2 cm. This is heated at 470 ° C. for 1 hour to volatilize the binder component,
The low-melting glass thin film 5 is made into a transparent film having a thickness of 2 μm, and the microspacer 6 is firmly adhered to the glass 3.

After cooling to room temperature, the small glass 3 is overlaid on the large glass 2 and PbO (85% by weight), B
₂ O ₃ (13% by weight), Al ₂ O ₃ (1% by weight), SiO ₂
(1% by weight) lead glass powder and PbTiO ₃ powder for approximating the thermal expansion coefficient of float glass mixed at a weight ratio of 60:40, glass frit having a softening temperature of 380 ° C. Then, a paste prepared by adding a binder containing butyl carbitol acetate, α-terpineol and cellulose to the paste was applied to the periphery of the plate glass to obtain a peripheral sealing material 7.

FIG. 3 is a cross-sectional view taken along the line bb 'of FIG. 1 of this embodiment. An exhaust tube pipe 8 made of soda-lime glass and processed into an L shape and having an outer diameter of 4 mmφ and an inner diameter of 2 mmφ is inserted into the exhaust opening 4, and the paste 7 of the peripheral sealing material is applied to the exhaust opening 4 and the exhaust tube pipe 8. It was applied to the contact area without any gap.

After heating the double-glazed glass, the binder of the peripheral sealing material 7 filled in the periphery is volatilized, burned off, and further heated to a working temperature of 470 ° C. to melt the glass frit. After cooling and firmly integrating, 160 ° C
While maintaining the ambient temperature, the exhaust tube 8 was connected to exhaust means such as a vacuum pump (not shown) to reduce the pressure inside the space to 0.1 Pa.

Finally, a flame was applied to the exhaust tube, and the portion was welded and cut to seal the low-pressure space.

A protective cap 9 made of a resin of acrylonitrile / styrene / butadiene and having a protrusion from the glass surface of 4.5 mm was provided at the sealing portion of the exhaust tube.

The low pressure double glazing thus produced has an initial dew point of -70 ° C. or less and a heat transmission coefficient of 0.6 W /
m ² ° C, and it was confirmed that dew condensation hardly occurred and good heat insulating performance was obtained.

The microspacer 6 did not move even when vibration or impact was applied, and the strength did not decrease and the appearance was not impaired. Embodiment 2 FIGS. 4 and 5 are views showing a section taken along line aa ′ and a section taken along line bb ′ in FIG. 1 in this embodiment.

The screen printing technique is used for the small glass 3 and only the place where the micro spacers 6 are arranged is set to 0.
A low-pressure double-glazed glass was produced in the same manner as in Example 1 except that a thin film 5 of a low-melting glass having a size of 3 mmφ and a pitch of 2 cm × 2 cm was formed.

The initial dew point of the produced low pressure double glazing is-
70 ° C or less, and the heat transmission coefficient is 0.6 W / m ² ° C.
It was confirmed that dew condensation hardly occurred and good heat insulating performance was obtained.

Further, the microspacer 6 did not move even when vibration or impact was applied, and the strength did not decrease and the appearance was not impaired.

[0045]

According to the low pressure double glazing of the present invention, by using the thin film of the low melting point glass, the micro spacers arranged between the glass plates are fixed, so that the movement of the micro spacers can be prevented for a long time. As a result, the arrangement of the micro spacers becomes irregular, thereby preventing the appearance from being impaired and the strength from being reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a low-pressure double glazing of the present invention.

FIG. 2 is a cross-sectional view taken along line aa ′ of FIG.

FIG. 3 is a sectional view taken along line bb ′ of FIG. 1 in the first embodiment.

FIG. 4 is a cross-sectional view taken along aa ′ of FIG. 1 in a second embodiment.

FIG. 5 is a cross-sectional view taken along line bb ′ of FIG. 1 in a second embodiment.

[Explanation of symbols]

 1. Low pressure double glazing 2. 2. Glass plate with low radiation film Glass plate 4. Exhaust opening 5. 5. Thin film of low melting glass Micro spacer 7. Peripheral sealing material 8. 8. Exhaust tube pipe Protective cap

Claims (4)

[Claims] (1) two plate glasses are spaced at a predetermined interval, and microspacers are disposed in a dot-like manner to maintain the interval;
In the low-pressure double-layer glass in which the low-pressure space is formed by sealing the peripheral edge of the panel with a sealing material, at least the microspacer arrangement part of the whole or part of the low-pressure space side of one of the pair of plate glasses A low-pressure double-glazed glass characterized in that a low-melting glass thin film is coated thereon and the coated low-melting glass thin film is fused to micro-spacers interspersed. 2. The low pressure double glazing according to claim 1, wherein the softening temperature of the low melting point glass coated on the portion where the microspacer is arranged is higher than the softening temperature of the peripheral sealing glass. 3. The method according to claim 1, wherein the thickness of the low-melting-point glass thin film coated on the portion where the micro spacers are arranged is in the range of 0.01 to 20% of the thickness of the micro spacers interspersed. Item 3. The low-pressure double glass according to Item 1 or 2. 4. The low-pressure double-glazed glass according to claim 1, wherein the low-melting glass coated on the portion where the microspacer is arranged is transparent.