JP2002128542A - Heat-shielding fireproof glass article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fireproof glass article having fireproofness, heat-shielding property, light weight and thin thickness and facilitating application work and not requiring a gel layer. SOLUTION: The heat-shielding fireproof glass article comprises a transparent heat resistant crystallized glass having Young's modulus of 80 Gpa >= and forms on the surface of the glass an infrared-reflecting film 3 having reflectance of >=70% at 2,500 nm wavelength and visible light average transmissiveness of 70% >=.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire-resistant glass article having a heat-shielding property, which is used to prevent the spread and spread of fire in a fire or to ensure safety during evacuation.

[0002]

2. Description of the Related Art Products called fireproof glass include netted glass, tempered glass, crystallized glass and the like, which have already been implemented. These fire glasses are heat resistant,
In the event of a fire, it functions as a window that blocks the flame and gas and also ensures the view inside. However, these fire prevention glasses can hardly attenuate radiant heat to the non-fire side. This radiant heat causes a fire to spread to an adjacent room, and further causes a problem that a safety route at the time of evacuation cannot be secured.

Conventionally, when a function of blocking radiant heat is required, the gel layer 5 is sandwiched between two glass plates 1a and 1b as shown in FIG. Fireproof glass articles that foam and exhibit heat shielding properties are used.

[0004]

However, the fire-resistant glass article described above requires a high material cost due to the use of a large amount of gel, and has a very high construction cost due to its large thickness and heavy weight. Furthermore, the gel layer foams and becomes opaque within a few minutes, and almost no function of securing a view necessary for a window at the time of fire can be expected.

It is an object of the present invention to provide a fire-resistant glass article which has both fire protection and heat insulation, is lightweight, thin and easy to construct, and does not require a gel layer.

[0006]

Means for Solving the Problems The fire-resistant glass article having heat-shielding properties of the present invention comprises a transparent heat-resistant crystallized glass having a Young's modulus of 80 GPa or more.
The reflectance at a wavelength of 2500 nm is 70% or more;
In addition, a heat ray reflective film having an average visible light transmittance of 70% or more is formed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a transparent heat-resistant crystallized glass plate having a high Young's modulus is used for applying a heat ray reflective film. Generally, the heat ray reflective film has a function of reflecting heat rays at the time of fire, suppressing heat radiation from the glass plate, and attenuating radiant heat to an adjacent room. The heat ray reflectance of the heat ray reflection film is improved as the film thickness is increased, but the average visible light transmittance is decreased. Further, since the thickness of the glass plate lowers the average transmittance of visible light, the appearance as a window is further impaired. Therefore, it is conceivable to make the thickness of the heat ray reflection film thicker by reducing the thickness of the glass plate as much as possible.However, ordinary window glass has a low Young's modulus. Becomes difficult. Therefore, if a transparent heat-resistant crystallized glass plate having a high Young's modulus is used, it is difficult to warp even with a large thin plate, and the heat ray reflective film can be applied thickly, so that the heat ray reflectance and the visible light average transmittance are high. Become.

[0008] The transparent heat-resistant crystallized glass of the fire-resistant glass article of the present invention is 3 to 5% by weight of Li ₂ O and Al ₂ O _{3 by} weight%.
_{20~30%, SiO 2 55~70%,} TiO 2 1~
3%, ZrO ₂ 1-4%, P ₂ O ₅ 1-5%, Na ₂ O
_{0~4%, K 2 O 0~4%} , Na 2 O + K 2 O 0.
It has a composition of 5-4%, precipitates β-quartz solid solution crystals, and has a coefficient of thermal expansion of −10 to 15 × 10 ⁻⁷ / ° C. (30 to ⁷ %).
(50 ° C.) and a thermal expansion coefficient close to zero, so that the heat resistance is very high. Therefore, it has a function of shutting off the flame without being damaged by heat and water discharged from the sprinkler at the time of fire. In addition, the Young's modulus of the transparent heat-resistant crystallized glass is 80 GPa to 100 GPa, which is much larger than the Young's modulus of a soda-lime glass plate or the like which is usually used as a window plate. Since it can be made thin, the average visible light transmittance showing the function as a window can be further increased, and the heat ray reflection film can be applied thickly, so that the heat ray reflectance can be increased. Furthermore, there is an advantage that the weight of the fireproof glass article can be reduced and the construction cost can be reduced by reducing the thickness of the sheet.

The heat ray reflective film has a reflectance of 70% or more at a wavelength of 2500 nm. The temperature at the time of the fire is 800-900 ° C., and the heat ray energy distribution corresponds to the wavelength of light of 2,000 nm to 3000 nm. Radiant heat, and the heat radiation to the non-fire side can be sufficiently suppressed. However, if the heat ray reflectivity at a wavelength of 2500 nm is less than 70%, the amount of radiant heat can hardly be attenuated, resulting in insufficient heat shielding.

[0010] The heat ray reflective film is made of visible light (400 nm to 400 nm).
(700 nm) is 70% or more. If the average visible light transmittance is less than 70%, the transparency is reduced, and a sufficient field of view cannot be secured, and the function as a window is impaired.

Further, the film thickness of the heat ray reflective film is 1000 ° -1.
5000 °, preferably 2000 ° to 12000 °
It is. When the film thickness is less than 1000 °, the wavelength is 2500 nm.
Has a heat ray reflectance of less than 70% and a film thickness of 1
If the thickness is more than 5000 °, the average visible light transmittance will be less than 70%.

As a heat ray reflective film having the above characteristics,
An indium oxide film containing tin, an antimony oxide film containing tin, a tin oxide film containing fluorine, or a tin oxide film containing antimony are most suitable.
In addition, a ZnO-based transparent film can also be used, but is not limited thereto. These films can be attached to a glass plate by a process such as a sputtering method, a spray method, or a dipping method.

As shown in FIGS. 1 and 2, the fire-resistant glass article having heat-shielding properties of the present invention comprises a single fire-resistant glass 1a.
It is characterized in that the heat ray reflective film 2 is formed on one surface or both surfaces on the surface.

In the case where a higher heat shielding property is required, for example, as shown in FIG. 3, a plurality of fireproof glass plates 1a and 1b are laminated glass with an intermediate resin layer 3 interposed therebetween. Alternatively, as shown in FIG. 4, it is also possible to use a fireproof glass plate 1a, 1b to form a double glazing incorporating an air space 4.

[0015]

EXAMPLES Hereinafter, the fire-resistant glass article having heat shielding properties of the present invention will be described in detail based on Examples and Comparative Examples.

[0016]

[Table 1]

Table 1 shows examples of the present invention (samples No. 1 to No. 1).
3) and Comparative Examples (Sample Nos. 4 to 6).

(Example No. 1) First, 1500 × 10
The expansion coefficient having a size of 00 × 5 ^t mm is −5 × 10 ^−7.
/ ° C., one heat-resistant transparent crystallized glass plate (Li ₂ O—Al ₂ O ₃ —SiO ₂ system) having a Young's modulus of 90 GPa was prepared. The weight of this glass plate was 19 kg. Next, an indium oxide film containing tin was formed on one surface of the prepared glass plate by a sputtering apparatus. The thickness of the ITO film formed by this apparatus was 5000 °.

(Embodiment No. 2) One piece of the same heat-resistant transparent crystallized glass as in Example 1 was prepared. The thickness of the glass plate was 3 mm. I checked the weight and found 11k
g. Next, a similar indium oxide film was formed on one surface of the glass plate using the same sputtering apparatus. When the film thickness was measured, it was 8000 °.

(Embodiment No. 3) One piece of the same heat-resistant transparent crystallized glass as in No. 1 was prepared. Next, this glass plate was heated to 600 ° C. in an electric furnace, and a stannic chloride solution containing 1% of antimony was applied to one surface of the glass plate by a spray device. The thickness of the tin film formed by this apparatus was 3500 °.

(Examples Nos. 4 to 6) 4,
5 and 6, a heat-resistant transparent crystallized glass plate (thickness: 5 mm) and a borosilicate glass plate (thickness: 7
mm) and a glass plate with a net (thickness: 7 mm).
After confirming the weight, 19kg and 23k respectively
g, 28 kg. In addition, each glass plate has
The heat ray reflective film was not formed.

(Evaluation) The spectral characteristics of the glass plates of the examples and comparative examples were measured with a spectrophotometer. The results are shown in Table 1. For the examples (Nos. 1 to 3), a wavelength of 250
The heat ray reflectance at 0 ° was 76 to 92%, and the average visible light transmittance was 82 to 86%, which was favorable as an external appearance.

Next, a heat shield test was performed on the test piece using each glass plate. In the heat shield test, first, the test specimen was set in front of the gas heating furnace, and then the 112
Heating was performed based on the standard heating curve of No. 5 and the maximum heat received (W) after 30 minutes and 60 minutes by a heat flow sensor installed at a position 1.0 m away from the center of the unheated surface of the specimen.
/ Cm ² ). In addition, about the test body used for the Example, the test was performed both when the heat ray reflective film was on the heating surface side (case A) and when the heat ray reflective film was on the non-heated surface side (case B). As is clear from the table, in the examples (Nos. 1 to 3), the amount of heat received after 30 minutes is 1.0 to 1.5 W / cm ² , and the amount of heat received after 60 minutes is 1.5 to 1. 9 W / cm ² , which is 1.8 to 2.0 W / cm 30 minutes after the comparative example (Nos. 4 to 6).
It was lower than 2.8 to 3.0 W / cm ² after ² and 60 minutes.

In the examples (Nos. 1 to 3), the opposite side is visible even after more than 60 minutes, and as a result of measuring the spectral characteristics after the fire prevention test, the heat ray reflectance at a wavelength of 2500 nm is 76 to 8
At 8%, the transparent heat-resistant crystallized glass plate showed no change in appearance at all.

Comparative Example No. Sample No. 6 was damaged immediately after heating, gradually began to deform, dropped out after 60 minutes, and the flame leaked. Comparative Example No. In No. 5, the appearance was deformed due to undulation on the surface of the glass plate after 60 minutes. However, in Comparative Example No. 4
Did not show any change in appearance because a transparent heat-resistant crystallized glass plate was used.

[0026]

As described above, the fire-resistant glass article of the present invention has a high heat-shielding property because radiant heat at the time of a fire is reflected by the heat ray reflective film. For this reason, it is difficult for an adjacent object existing in the adjacent room to ignite, and the fire can be prevented from spreading. Also, a sufficient evacuation route in case of fire can be secured. Furthermore, since transparency can be ensured forever, not only can the situation of the fire be grasped, but also the flame can be shut off because there is no damage, and life saving and fire extinguishing activities become easy. Moreover, it is thinner and lighter than conventional products, has no warpage, and has a very low construction cost, so that it is suitable as fireproof glass.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a fire-resistant glass article in which a heat ray reflective film of the present invention is formed on one side.

FIG. 2 is an explanatory view of a fire-resistant glass article in which the heat ray reflective film of the present invention is formed on both sides.

FIG. 3 is an explanatory view of a laminated glass using the fire-resistant glass article of the present invention.

FIG. 4 is an explanatory diagram of a double glazing using the fire-resistant glass article of the present invention.

FIG. 5 is an explanatory view showing a conventional fire-resistant glass article having a gel layer.

[Explanation of symbols]

 1a, 1b: Fireproof glass plate 2: Heat ray reflective film 3: Intermediate resin layer 4: Air layer 5: Gel layer

Claims (5)

[Claims] 1. A transparent heat-resistant crystallized glass having a Young's modulus of 80 GPa or more, and having a reflectance at a wavelength of 2500 nm of 70% or more and a visible light average transmittance of 70% or more on the surface of the glass plate. A fire-resistant glass article having heat-shielding properties, wherein a heat ray reflective film is formed. 2. The transparent heat-resistant crystallized glass has a coefficient of thermal expansion in the range of 30 to 750 ° C., −20 to 20 × 10 ⁻⁷ /.
2. The fire-resistant glass article having heat insulation according to claim 1, wherein the temperature is ℃. 3. The heat-insulating fire-resistant glass article according to claim 1, wherein the heat ray reflective film is formed on one or both sides of a transparent heat-resistant crystallized glass plate. 4. The heat-insulating glass article according to claim 1, wherein the heat ray reflective film is made of tin-containing indium oxide, tin-containing antimony oxide, fluorine-containing tin oxide, or antimony-containing tin oxide. 5. The heat ray reflective film has a thickness of 1000 to 15 mm.
The fire-resistant glass article having heat shielding properties according to claim 1, wherein the heat-insulating glass article has a thickness of 000 °.