JP2014218422A - Fireproof glass, evaluation method and production method of fireproof glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fireproof glass excellent in light transmissivity, having thin thickness of a glass plate, and having high intensity of the glass plate.SOLUTION: A glass 101 to which high surface compression stress can be applied even with thin thickness, and which has been subjected to chemical strengthening processing is used as a fireproof glass. the fireproof glass may be formed into a multiple glass formed of a glass laminate and the glass 101 subjected to the chemical strengthening processing, a multiple glass formed of the plural glasses 101 subjected to the chemical strengthening processing, and a multiple glass in which a Low-E layer is formed on the glass plates, thereby the fireproof glass has more thinner thickness and higher intensity. The surface compression stress of the chemical strengthened glass is 180 MPa or more. Depth of the surface compression stress is 1 μm or more, and the plate thickness of the glass is 2-3 mm.

Description

  The present invention relates to fire glass.

  Conventionally, as a fire-proof glass that requires flame-shielding performance for the purpose of preventing the spread of fire, etc., in addition to a meshed glass (Patent Document 1) that prevents the glass from cracking and dropping when a fire occurs, Patent Document 1 Heat-resistant tempered glass that forms surface compression stress on the glass surface and resists tensile stress (thermal stress) generated by the temperature difference between the glass surface generated by fire and the edge covered with sash, making it difficult to break ( Patent Document 2) and transparent crystallized glass (Patent Document 3) are used.

JP-A-5-70190 International Publication No. 2008-020509 JP 2006-044997 A

  However, the netted glass described in Patent Document 1 must be thickened by the amount of netting. Further, in the air cooling strengthening method described in Patent Document 2, it is difficult to form a surface compressive stress layer on a thin glass plate because the temperature difference between the surface and the inside is difficult to be obtained, and sufficient fire prevention performance is achieved. The strength that satisfies the requirements cannot be obtained. Therefore, heat-resistant tempered glass (hereinafter referred to as fire-proof tempered glass for fire protection) by the air-cooling tempering method has a problem that the thickness of the glass plate must be increased. Moreover, the transparent crystallized glass described in Patent Document 3 is such that when petroleum containing petroleum, coal, gas, wood, or the like containing sulfur burns, the crystal shrinks due to an ion exchange reaction between the crystal and a product produced by combustion, and the surface is fine. There is a problem in that the strength is reduced due to the occurrence of cracks.

  This invention is made | formed in view of such a situation, and it aims at providing the fire prevention glass whose thickness of a glass plate is thin and is high intensity | strength. Another object of the present invention is to provide an evaluation method for simply evaluating the fireproof performance of fireproof glass and a method for producing fireproof glass using the evaluation method.

  In order to achieve the above object, chemically tempered glass is used as the fireproof glass which is one embodiment of the present invention.

  In the present invention, a fireproof glass having excellent translucency, thin thickness and high strength is provided. Moreover, the manufacturing method of the fire prevention glass using the evaluation method and its evaluation method which evaluate simply the fire prevention performance of fire prevention glass is provided.

It is sectional drawing which shows the fire prevention glass by 1st Embodiment of this invention. It is sectional drawing which shows the fire prevention glass by 2nd Embodiment of this invention. It is sectional drawing which shows the fire prevention glass by 3rd Embodiment of this invention. It is sectional drawing which shows the fire prevention glass by 4th Embodiment of this invention. It is the schematic showing the apparatus of the simple test which measures fire prevention performance. It is a figure which shows the relationship between the temperature in a box at the time of testing the glass plate of 1st Embodiment, and time.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First fire glass)
FIG. 1 shows a schematic cross-sectional view of the first fire glass 100. In the following description, coordinates are defined by an arrow in the lower left of the figure, and description will be made using these coordinates if necessary. Moreover, FIG. 1 is the cross-sectional schematic diagram which looked at the fire prevention glass from the end surface side of glass.

  As shown in FIG. 1, the first fire glass 100 according to the first embodiment of the present invention is composed of a chemically strengthened glass plate (hereinafter, chemically strengthened glass plate) 101.

Here, the glass used as the glass plate 101 subjected to the chemical strengthening treatment in the present invention is expressed in terms of oxide-based mole percentage, SiO ₂ is 56 to 75%, Al ₂ O ₃ is 1 to 20%, and Na ₂ O is 8%. It is characterized by containing ˜22%, K ₂ O 0-10%, MgO 0-14%, ZrO ₂ 0-5% and CaO 0-10%. Hereinafter, unless otherwise specified, the percentage display indicates the molar percentage display content.

  The reason why the glass composition is limited to the above range in the chemically strengthened glass of this embodiment will be described below.

SiO ₂ is known as a component that forms a network structure in the glass microstructure, and is a main component constituting the glass. The content of SiO ₂ is 56% or more, preferably 60% or more, more preferably 63% or more, and further preferably 65% or more. Further, the content of SiO ₂ is 75% or less, preferably 73% or less, more preferably 71% or less. When the content of SiO ₂ is 56% or more, it is advantageous in terms of stability and weather resistance as glass. On the other hand, when the content of SiO ₂ is 75% or less, it is advantageous in terms of meltability and moldability.

Al ₂ O ₃ has an effect of improving ion exchange performance in chemical strengthening, and particularly has a large effect of improving surface compressive stress (CS). It is also known as a component that improves the weather resistance of glass. Moreover, there exists an effect | action which suppresses the penetration | invasion of the tin from a bottom surface at the time of float forming. The content of Al ₂ O ₃ is 1% or more, preferably 3% or more, more preferably 5% or more. Further, the content of _Al 2 _{O 3,} the content of _Al 2 _{O 3} is more than 20%, preferably 17% or less, more preferably 12% or less, more preferably 10% or less, particularly preferably 7 % Or less. When the content of Al ₂ O ₃ is 1% or more, desired CS is obtained by ion exchange, and an effect of suppressing infiltration of tin is obtained. On the other hand, if the content of Al ₂ O ₃ is 20% or less, the devitrification temperature does not increase greatly even when the viscosity of the glass is high, which is advantageous in terms of melting and forming in the soda lime glass production line. .

The total SiO ₂ + Al ₂ O ₃ content of SiO ₂ and Al ₂ O ₃ is preferably 80% or less. If it exceeds 80%, the viscosity of the glass at high temperature may increase and melting may be difficult, and it is preferably 79% or less, more preferably 78% or less. _Further, it is preferable that SiO 2 + _Al 2 _{O 3} is 70% or more. If it is less than 70%, the crack resistance when an indentation is attached is lowered, more preferably 72% or more.

Na ₂ O is an essential component for forming a surface compressive stress layer by ion exchange, and has an effect of increasing the depth of compressive stress (DOL). Moreover, it is a component which lowers the high temperature viscosity and devitrification temperature of glass, and improves the meltability and moldability of glass. The content of Na ₂ O is 8% or more, preferably 12% or more, more preferably 13% or more. Further, the content of Na ₂ O is 22% or less, preferably 20% or less, more preferably 16% or less. When the content of Na ₂ O is 8% or more, a desired surface compressive stress layer can be formed by ion exchange. On the other hand, when the content of Na ₂ O is 22% or less, sufficient weather resistance can be obtained.

K ₂ O is not essential, but may be contained because it has the effect of increasing the ion exchange rate and deepening the DOL. On the other hand, if the amount of K ₂ O is excessive, sufficient CS cannot be obtained. Preferably 10% or less when they contain K ₂ O, preferably 8% or less, more preferably 6% or less. When the content of K ₂ O is 10% or less, sufficient CS can be obtained.

  MgO is not essential, but is a component that stabilizes the glass. The content of MgO is 2% or more, preferably 3% or more, more preferably 3.6% or more. Further, the content of MgO is 14% or less, preferably 8% or less, more preferably 6% or less. When the content of MgO is 2% or more, the chemical resistance of the glass becomes good. The meltability at high temperature becomes good and devitrification hardly occurs. On the other hand, when the content of MgO is 14% or less, the difficulty of devitrification is maintained, and a sufficient ion exchange rate is obtained.

ZrO ₂ is not essential, but it is generally known that ZrO ₂ has an action of increasing the surface compressive stress in chemical strengthening. However, even if a small amount of ZrO ₂ is contained, the effect is not great for the cost increase. Therefore, an arbitrary proportion of ZrO ₂ can be contained as long as the cost permits. When it contains, it is preferable that it is 5% or less.

  CaO is not essential, but is a component that stabilizes the glass. Since CaO tends to inhibit the exchange of alkali ions, it is preferable that the content is reduced or not contained particularly when it is desired to increase the DOL. On the other hand, in order to improve chemical resistance, it is preferable to contain 2% or more, preferably 4% or more, more preferably 6% or more. The amount in the case of containing CaO is 10% or less, preferably 9% or less, more preferably 8.2% or less. When the content of CaO is 10% or less, a sufficient ion exchange rate is maintained, and a desired DOL is obtained.

  SrO is not essential, but may be contained for the purpose of lowering the high temperature viscosity of the glass and lowering the devitrification temperature. Since SrO has the effect of lowering the ion exchange efficiency, it is preferable not to contain it especially when it is desired to increase the DOL. When contained, the amount of SrO is 3% or less, preferably 2% or less, more preferably 1% or less.

  BaO is not essential, but may be contained for the purpose of lowering the high temperature viscosity of the glass and lowering the devitrification temperature. Since BaO has the effect of increasing the specific gravity of the glass, it is preferably not contained when the weight is intended to be reduced. The BaO content when contained is 3% or less, preferably 2% or less, more preferably 1% or less.

TiO ₂ is abundant in natural raw materials and is known to be a yellow coloring source. The content of TiO ₂ is 0.3% or less, preferably 0.2% or less, more preferably 0.1% or less. If the content of TiO ₂ exceeds 0.3%, the glass becomes yellowish.

  In addition, chlorides, fluorides, and the like may be appropriately contained as glass refining agents. The glass of the present invention consists essentially of the components described above, but may contain other components as long as the object of the present invention is not impaired. When such components are contained, the total content of these components is preferably 5% or less, more preferably 3% or less, and typically 1% or less. Hereinafter, the other components will be described as an example.

  ZnO may be contained up to 2%, for example, in order to improve the meltability of the glass at a high temperature. However, when it is produced by the float process, it is preferably not contained because it is reduced by a float bath and becomes a product defect.

B ₂ O ₃ may be contained in a range of less than 1% in order to improve the meltability at high temperature or the glass strength. In general, when an alkali component of Na ₂ O or K ₂ O and B ₂ O ₃ are contained at the same time, volatilization becomes intense and the brick is remarkably eroded. Therefore, it is preferable that B ₂ O ₃ is not substantially contained.

Li ₂ O is a component that lowers the strain point to facilitate stress relaxation, and as a result makes it impossible to obtain a stable surface compressive stress layer, so it is preferably not contained, and even if it is contained, its content Is preferably less than 1%, more preferably 0.05% or less, and particularly preferably less than 0.01%.

The method for producing the glass of the present invention is not particularly limited. For example, various raw materials are prepared in appropriate amounts, heated to about 1500 to 1600 ° C. and melted, and then homogenized by defoaming, stirring, etc. As a method of chemical strengthening treatment, which is manufactured by forming into a plate shape by casting or forming into a block shape by casting, cutting into a desired size after slow cooling, and polishing as necessary, for example, an ion exchange method and so on. In the ion exchange method, a glass is immersed in a processing solution, and ions having a small ion radius (for example, Li ions and Na ions) contained in the surface layer of the glass are replaced with ions having a large ion radius (for example, K ions). By doing so, a compressive stress is generated on the surface layer of the glass by an increasing volume fraction.

  As an index indicating the degree of chemical strengthening, compressive stress (CS) on the glass surface and depth of the compressive stress layer (Depth of layer: DOL) are used.

  If CS is higher than the value of thermal stress generated on the glass surface, the glass can be made difficult to break. In particular, CS is preferably 180 MPa or more, more preferably 300, 400, 500, 550, 600, 650, 700 MPa or more.

  The DOL is considered to indicate to what depth the CS counters the thermal stress generated in the thickness direction from the glass surface. The DOL is preferably 1 μm or more, more preferably 3, 5, 10, 15, 20, 25, 30, 35 μm or more.

  Moreover, if CS is high, the glass surface is less likely to be scratched when the glass is attached to the sash, and even if it is scratched, it is difficult to progress. Even if there is a scratch, CS is formed at the depth of the DOL. Therefore, if the depth of the DOL is larger than the depth of the scratch, the thermal stress can be resisted regardless of the presence or absence of the scratch.

In addition, the specific method of a chemical strengthening process will not be specifically limited if the above-mentioned ion exchange is possible. For example, a method of dipping the glass plates and the like in the heated potassium nitrate (KNO ₃₎ molten salt. The conditions for forming the desired surface compressive stress layer on the glass plate vary depending on the thickness of the glass plate, but it is typical to immerse the glass substrate in 400 to 550 ° C. KNO ₃ molten salt for 2 to 20 hours. is there.

  The chemically strengthened glass plate 101 according to the present embodiment has a surface layer that is strengthened by a compressive stress, and even when a tensile stress due to heat is generated, it is difficult to break, so that sufficient flameproof performance can be obtained as a fireproof glass. Therefore, it is not necessary to insert a net assuming that the glass is broken like a glass with a net, and the thickness of the glass plate can be reduced. Furthermore, problems such as destruction due to rust are eliminated.

  Further, the chemically strengthened glass plate 101 can form sufficiently high CS and DOL even if the glass plate is thin. Therefore, the glass plate thickness is reduced compared with the air-cooling strengthening in which compression stress is not easily formed on the thin glass plate. be able to. Specifically, in the case of wind cooling strengthening, it is very difficult to sufficiently strengthen the glass plate with a minimum thickness of 5 mm or less, which is the minimum thickness of fireproof glass for general detached buildings and buildings. It is possible to produce a glass plate having a fireproof performance with a thickness of 2 to 3 mm.

  Further, the chemically tempered glass plate 101 does not undergo an ion exchange reaction with a product by combustion unlike transparent crystallized glass, so that fine cracks are hardly generated on the surface. Furthermore, even if a fine crack is generated in the surface, the crack is difficult to develop due to the compressive stress on the surface, and a high strength can be obtained.

  From the above, by using a fireproof glass using chemically strengthened glass, a fireproof glass having excellent translucency, a thin glass plate, and high strength can be obtained.

(Second fire glass)
Next, a second embodiment (second fire glass 200) of the present invention will be described with reference to FIG. In FIG. 2, the cross-sectional schematic diagram of the 2nd fireproof glass 200 is shown. The second fireproof glass 200 is a laminated glass 204 in which the chemically strengthened glass 101 is partially incorporated. Therefore, the same reference numerals are used for the same members as in FIG. 1 and the description thereof is omitted.

  In the present embodiment, the first glass plate 202 and the chemically strengthened glass plate 101 are bonded via the intermediate film 201, and the Low-E film 205 is formed on the first surface 101 </ b> A of the chemically strengthened glass plate 101. Is formed.

  The first glass plate 202 may be a general soda lime glass or the like that is not chemically strengthened, or may be a chemically strengthened glass plate.

  The intermediate film 201 is composed of a thermoplastic resin, a thermosetting resin, an ultraviolet curable resin, etc., and includes a vinyl polymer, an ethylene-vinyl monomer copolymer, a styrene copolymer, a polyurethane resin, a fluororesin, and an acrylic resin. It is preferably composed of one or more types selected from resins. For example, polyvinyl butyral resin (PVB) is typical.

The Low-E film 205 is a film that realizes low radiation performance, and may be equivalent to a generally known composition and configuration. For example, a laminate of transparent dielectric films made of metallic zinc, such as an absorption layer made of titanium nitride (TiN), a transparent dielectric film made of silicon nitride (Si ₃ N ₄ ), an Ag main component film, or the like may be used. Good. Moreover, what is necessary is just to set the thickness of each layer arbitrarily according to desired heat-shielding performance.

  In the present embodiment, the example in which the Low-E film 205 is provided on the first surface 101A is shown, but the Low-E film 205 may be provided on the second surface 101B.

  The significance of providing the Low-E film 205 is as follows. For example, when a fire occurs from the right side of the chemically strengthened glass plate 101 of the second fireproof glass 200 shown in FIG. 2, the flame itself is shielded by the chemically strengthened glass 101, but heat generated from the flame is transmitted, 1 glass plate 202 may break. Furthermore, if the intermediate film 201 is ignited by heat, the original purpose of flame shielding of the fireproof glass cannot be achieved. In such a case, it is preferable from the viewpoint of improving the flame shielding performance to provide a Low-E film 205 on the surface of one of the glass plates and enhance the heat shielding and heat insulating properties as in this embodiment.

  As described above, according to the present embodiment, in addition to the effect of the first embodiment, even if cracking occurs, the interlayer film 201 prevents the glass piece from falling off and has a flame shielding performance. Can keep. Furthermore, by providing the Low-E film 205, it is possible to enhance heat insulation and heat insulation, prevent cracking of the glass plate due to heat conduction and ignition of the intermediate film, and improve the flame insulation.

(Third fire glass)
The third fireproof glass 300 is a multi-layer glass in which a chemically strengthened glass plate 101 is partially incorporated. In FIG. 3, the same members as those in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 3, the third fire glass 300 is a laminated glass composed of a first glass plate 202 bonded through an intermediate film 201 and a second glass plate 301 having a low-E film 205 formed on the surface. 304 is spaced from the chemically strengthened glass plate 101 with a spacer 306 interposed therebetween.

  Then, the side surfaces of the spacer 306 facing the second glass plate 301 and the chemically strengthened glass plate 101 are bonded to the second glass plate 301 and the chemically strengthened glass plate 101 by primary sealing materials 307A and 307B, respectively.

  Thereby, a hollow layer 308 is formed between the second glass plate 301 and the chemically strengthened glass plate 101. Further, the outer sides of the primary sealing materials 307A and 307B are sealed with the secondary sealing material 309. The hollow layer is preferably maintained at atmospheric pressure or in a vacuum state.

  The chemically strengthened glass plate 101, the first glass plate 202, and the second glass plate 301 may be general soda-lime glass that is not chemically strengthened, or may be a chemically strengthened glass plate. . That is, at least one of the third fireproof glasses 300 may be a glass plate that has been chemically strengthened, and two or more glass plates that have been chemically strengthened may be used. In particular, the most flame-side glass plate is preferably a chemically strengthened glass plate.

  In this embodiment, although the example in which the Low-E film | membrane 205 was formed in the 1st surface 301A of the 2nd glass plate 301 was shown, it is not restricted to this embodiment. For example, it may be formed on the second surface 301B of the second glass plate 301, the first surface 101A of the chemically strengthened glass plate 101, or the like. That is, as described in the second embodiment, the Low-E film 205 is formed of any glass plate as long as it is used in a manner to prevent cracking of the glass plate on the opposite side of the fire occurrence side and ignition of the intermediate film. It may be provided on the surface.

  As the spacer 306, a metal spacer whose main material is aluminum is often used, but a spacer made of stainless steel or hard resin may also be used. The spacer 306 has a hollow portion 310 therein, and the hollow portion 310 is filled with a desiccant 311 such as granular zeolite. The spacer 306 has a through hole 312 that allows the hollow portion 310 to communicate with the hollow layer 308, and the air in the hollow layer 308 is dried through the through hole 312.

  The primary sealing materials 307A and 307B use a butyl-based sealing material as a main component, but a flame retardant may be blended in order to improve flame retardancy. In order to improve processability and adhesiveness, vulcanizing agents, vulcanization accelerators, crosslinking agents such as vulcanization aids, vulcanization retarders, and other additives (carbon black, silica, clay, talc, calcium carbonate Such as filler, wax, silane coupling agent, activator, plasticizer, softener, anti-aging agent, antioxidant, lubricant, pigment, UV absorber, dispersant, dehydrating agent, tackifier, You may mix | blend an antistatic agent and a processing aid. These compounding components can include those generally used for rubber compositions. Their blending amounts are not particularly limited, and are arbitrarily selected.

  The secondary sealing material 309 is preferably made of a curable elastomer such as polysulfide, silicone, urethane, and the like that has been appropriately modified in order to develop adhesion to glass, like the primary seal.

  In addition to the effects of the first embodiment and the second embodiment, a hollow layer is further provided to improve the heat insulation performance by using a multi-layer glass as in this embodiment. It is possible to prevent cracking of the glass plate and ignition of the intermediate film due to heat conduction.

  In addition, by using a chemically strengthened glass plate, the thickness can be reduced even with a multi-layer glass having the same strength, so that it is possible to improve the effectiveness and reduce the weight. In particular, it is possible to install in a place where it has been difficult to install a multi-layer glass containing tempered glass because of restrictions on the window sash width.

  In addition, the structure of a multilayer glass is not limited to this embodiment. For example, it is not necessary to use the laminated glass 304 as one side of the multilayer glass, and it may be a multilayer glass of either a first or second glass plate and a chemically strengthened glass plate.

(Fourth fire glass)
Next, a fourth embodiment (fourth fire glass 400) of the present invention will be described with reference to FIG. In FIG. 4, the cross-sectional schematic diagram of the 4th fireproof glass 400 is shown. The fourth fireproof glass 400 has a configuration similar to that shown in FIG. Therefore, in FIG. 4, the same reference numerals as those in FIG. 3 are used for members corresponding to those in FIG.

  In the fourth fireproof glass 400 shown in FIG. 4, a first chemically strengthened glass plate 401, a second chemically strengthened glass plate 402, a third chemically strengthened glass plate 403 (hereinafter, three chemical strengthened glass if necessary) Glass plates) are opposed to each other with a spacer 306 interposed therebetween. Similarly to the third fireproof glass 300, each of the spacers 306 is sealed with the primary sealing materials 307A, 307B, 307C, 307D and the secondary sealing material 309, so that two hollow layers 308 are formed.

  If necessary, the first and third chemically strengthened glass plates 401 and 403 that are adjacent to one of the hollow layers 308 are connected to the glass plates on both sides and the second hollow layer 308 that is adjacent to both of the second hollow layers 308. The chemically strengthened glass plate 402 is expressed as an internal glass plate.

  In this way, by making a double-layer glass with two hollow layers 308 using three chemically strengthened glass plates, while further improving the heat insulation performance, suppressing cracks due to fire and improving the flame insulation performance be able to. In addition, compared to conventional multi-layer glass using netted glass or fire-cooled tempered glass for fire protection, high surface compressive stress can be obtained even with a thin plate thickness. It is possible to improve the enforceability and conform to the window sash width standard.

  In the present embodiment, the second chemically strengthened glass plate 402 has a higher degree of chemical strengthening than the first chemically strengthened glass 401 and the third chemically strengthened glass 403. Here, the high degree of chemical strengthening means that CS is high, DOL is deep, or both.

  Thus, since the fireproof performance can be secured by the second chemically strengthened glass plate 402 by increasing the degree of chemical strengthening of the second chemically strengthened glass 402 as compared with other chemically strengthened glass, the first and first The degree of chemical strengthening of the 3 chemically strengthened glass plates 401 and 403 can be reduced, and the manufacturing process can be simplified and the cost can be reduced. In addition, if the second chemically strengthened glass plate 402 has a degree of chemical strengthening enough to satisfy the flame shielding performance, the first and third chemically strengthened glass plates 401 and 403 are general soda limes that are not chemically strengthened. Glass may be used (in this specification, the degree of chemical strengthening of general soda lime glass that is not chemically strengthened is expressed as a CS value of 0 and a DOL value of 0). In this case, the Low-E film 205 may be formed on the surface of one of the glass plates in order to prevent the glass from being broken due to heat transfer.

  Moreover, the glass plate which raises the degree of chemical strengthening is not restricted to the 2nd chemically strengthened glass plate 402, The 1st chemically strengthened glass plate 401 and the 3rd chemically strengthened glass plate 403 may be sufficient. That is, at least one of the three glass plates may be a chemically strengthened glass having a degree of chemical strengthening that satisfies a desired flame shielding performance, and the other glass plates have a reduced degree of chemical strengthening. Also good. Moreover, you may use the general soda-lime glass which is not chemically strengthened for another glass plate.

  Further, the degree of chemical strengthening of any two of the three chemically strengthened glass plates may be increased. In this case, from the viewpoint of increasing strength against external force such as wind pressure and fine cracks, it is desirable to increase the degree of chemical strengthening of the glass on both sides, that is, the first and third chemically strengthened glass plates 401 and 403.

  The result of having examined the fire prevention performance using the fire prevention glass of embodiment of this invention is shown below.

<Example 1>
In this example, a simple test for measuring the fire performance shown in FIG. 5 was performed. The simple test apparatus includes a box-shaped structure 504 having a space inside, a glass plate 502, a flame generating means 503, and a heat-resistant member, and the box-shaped structure 504 is configured by a heat-resistant substrate, The glass plate 502 has an opening 506 and a second opening 505, the glass plate 502 has a central portion of the surface and a peripheral portion located outside thereof, a heat-resistant member is provided at the peripheral portion, and the first opening 506. The flame generating means 503 is arranged at a position facing the second opening 505, and the flame generating means 503 heats the space inside the box-shaped structure 504.

  Further, in this embodiment, a step of preparing a box-shaped structure that is made of a heat-resistant substrate and has a space therein, a step of arranging a glass plate inside the box-shaped structure, and a cover around the periphery of the glass plate A step of providing a member, a step of heating the inside of the box-like structure, a step of observing the heating time, the temperature inside the box-like structure, and the broken state of the glass plate. Disclosed is a method for evaluating fireproof glass.

  Moreover, in a present Example, the process of extracting at least 1 glass plate sample among several glass plates, the process of providing a cover member in the periphery of the extracted glass plate sample, The said glass plate sample is heat-resistant board | substrate. A step of arranging inside the box-shaped structure composed of: a step of heating the inside of the box-shaped structure; and a step of evaluating the breakage state of the glass plate sample inside the box-shaped structure. Disclosed is a method for producing a glass plate.

  The box-shaped structure 504 is composed of a calcium silicate plate 501 having a thickness of 40 mm. In the present embodiment, one of the surfaces is combined so as to form the first opening 506. In the first opening 506, an evaluation target glass plate 502 whose edge is covered with a calcium silicate plate 501 is disposed. The dimensions of the space inside the box-shaped structure 504 were 270 mm wide, 370 mm long, and 120 mm deep.

  Note that the present invention is not limited to this embodiment. For example, the first opening 506 may not be provided, and a glass plate may be provided in the space inside the box-shaped structure 504.

  The dimensions of the glass plate 502 to be evaluated are a width of 230 mm and a height of 330 mm, and both sides of a 10 mm portion (periphery) from the outer peripheral edge of the glass plate 502 to the center of the surface are covered with a calcium silicate plate 501 (cover member). It was. By doing so, a state in which the edge of the glass is covered with a sash is simulated.

  The cover member may be configured to be attached to the peripheral edge of the glass plate 502 independently of the box-like structure 504, and the cover member is provided on the box-like structure 504 like an actual sash. It may be configured to be disposed on the peripheral edge of the glass plate.

  In addition, although it is preferable that both surfaces of the peripheral part of the glass plate 502 are covered with a heat-resistant member, the structure which provides a heat-resistant member only in the space side inside may be sufficient.

  When the surface of the glass plate 502 is the front, second openings 505, that is, holes with a diameter of 40 mm are provided on both sides of the box-like structure, and the space inside the box is heated by the flame generating means 503 from the holes. did. By providing the second openings 505 on both side surfaces of the box-shaped structure, a flame is directly applied to the glass plate 502 and no local stress is generated. Thus, the glass plate 502 can be heated uniformly. As the flame generating means 503, a gas torch having a flame temperature of 800 ° C. to 1800 ° C. was used.

  The means for heating the box-like structure 504 is not limited to the present embodiment, and may be a heating means that can realize a steep slope of temperature rise described later. At that time, the second opening 505 is not necessarily provided.

  At this time, a thermocouple was inserted at a position about 10 cm from the glass surface in the box, and the temperature in the box was measured.

  By using this evaluation method, the inclination of the temperature rise in the box immediately after the start of heating can be made steep, and the fireproof performance of the glass plate 502 can be evaluated by simulating the room during a fire. Further, by making the gradient of temperature rise even steeper than a general fireproof test, the time required for the test can be shortened and the fireproof performance can be evaluated.

  Moreover, the glass plate which has appropriate fireproof performance can be manufactured in a shorter time by manufacturing glass using this evaluation method.

Incidentally, the volume of the box-like structure, 8000 cm ² or more 15000 cm ² or less, preferably as long as 10000 cm ² or more 13000Cm ² or less is preferable since it sharply the inclination of the temperature rise of the box immediately after the start of heating. The dimensions of the glass plate 502 can be changed as appropriate according to the size of one surface of the box-like structure 504.

Moreover, the dimension of a hole can be suitably changed according to the calorie | heat amount etc. of a flame, and you may provide a hole other than heating the inside of a box with the flame generation means 503. FIG. By changing the size of the hole and providing a new hole, air can be sent into the box to adjust the flame temperature and the temperature in the box. Show the relationship. As Example 1 and Example 2, a 3 mm thick chemically strengthened glass plate was used, and the degree of chemical strengthening was shown in the following table, respectively. Moreover, as a reference example, 5 mm thick fire-cooled air-cooled tempered glass plate with CS of 178 MPa, DOL of 833 μm (in general, DOL of air-cooled tempered glass is said to be 1/6 of the plate thickness, As a comparative example, a glass plate not subjected to tempering treatment was used. The temperature and time in the box until the glass plate breaks are measured, and the portion where the graph is broken in FIG. 6 indicates that the glass plate broke at that time.

  From FIG. 6, the glass plate which is not subjected to the tempering treatment, which is a comparative example, is cracked due to thermal stress generated in the box temperature of about 300 ° C. and 30 seconds from the start of heating. On the other hand, in Examples 1 and 2 subjected to chemical strengthening, even if the temperature in the box reaches about 500 ° C. to 600 ° C., about 1 minute is maintained in Example 1 and about 6 minutes in Example 2 without being broken. It was done. The reference example was similarly held without breaking for about 6 minutes.

  From the above results, it was found that fireproof performance can be obtained by using a chemically strengthened glass plate. From Example 1 and Example 2, it was found that the higher the CS and DOL, the higher the fire prevention performance.

  Here, although Example 1 and Example 2 have a difference in fire prevention performance despite the CS value being higher than the value of generally generated thermal stress, Example 1 and Example 2 are implemented. In Example 2, it was considered that the difference in DOL contributed to the fire performance.

  Moreover, since Example 2 showed the performance equivalent to a reference example, it turned out that a fireproof glass with thinner thickness is obtained, although it is the performance equivalent to the conventional fireproof glass.

  INDUSTRIAL APPLICABILITY The present invention can be used for fireproof glass used for building window glass and the like.

DESCRIPTION OF SYMBOLS 100 1st fireproof glass 101 Chemically strengthened glass plate 200 2nd fireproof glass 201 Intermediate film 202 1st glass plate 204,304 Laminated glass 205 Low-E film 301 2nd glass plate 301A 1st surface 301B 2nd Surface 306 Spacer 307A, 307B, 307C, 307D Primary sealant 308 Hollow layer 309 Secondary sealant 310 Hollow part 311 Desiccant 312 Through-hole 400 Third fire glass 401 First chemically strengthened glass plate 402 Second chemical Tempered glass plate 403 Third chemically strengthened glass plate 501 Calcium silicate plate 502 Glass plate 503 Flame generating means 504 Box-shaped structure 505 Second opening 506 First opening

Claims (16)

  Fireproof glass characterized by using chemically strengthened glass.   The fireproof glass according to claim 1, wherein a surface compressive stress of the chemically strengthened glass is 180 MPa or more.   The fireproof glass according to claim 1 or 2, wherein the depth of surface compressive stress of the chemically strengthened glass is 1 µm or more.   The fireproof glass according to any one of claims 1 to 3, wherein a thickness of the chemically strengthened glass is 2 mm or more and 3 mm or less.   The laminated glass obtained by bonding two glass plates with an intermediate film interposed therebetween, and at least one of the glass plates is the chemically strengthened glass. Fire glass.   In the double-layer glass in which two glass plates are arranged facing each other with a spacer and sealed with a sealing material to form a hollow layer, at least one of the glass plates is the chemically strengthened glass. The fire protection glass according to any one of claims 1 to 4.   The fireproof glass according to claim 6, wherein at least one of the two glass plates is a laminated glass bonded with an intermediate film interposed therebetween.   8. At least one of the two glass plates is a laminated glass in which a chemically strengthened glass plate and a non-chemically strengthened glass plate are bonded via the intermediate film. The fire glass described.   The fireproof glass according to any one of claims 5 to 8, wherein a Low-E film is formed on at least one surface of the two glass plates.   In the multi-layer glass in which three glass plates are arranged to face each other via a spacer and sealed with a sealing material to form two hollow layers, at least one of the glass plates is the chemical The fireproof glass according to claim 1, which is a tempered glass.   The fireproof glass according to claim 10, wherein the glass plate is a glass plate in which a Low-E film is formed on at least one surface of the three glass plates.   The fireproof glass according to claim 10 or 11, wherein the three glass plates are chemically strengthened glasses having different degrees of chemical strengthening. The three glass plates include a glass plate on both sides adjacent to one of the two hollow layers, and an internal glass plate adjacent to both the two hollow layers,
The fireproof glass according to any one of claims 10 to 12, wherein the degree of chemical strengthening of the glass plates on both sides is smaller than the degree of chemical strengthening of the internal glass plates. The three glass plates include a glass plate on both sides adjacent to one of the two hollow layers, and an internal glass plate adjacent to both the two hollow layers,
The fireproof glass according to any one of claims 10 to 12, wherein a degree of chemical strengthening of the glass plates on both sides is greater than a degree of chemical strengthening of the internal glass plates. A step of preparing a box-shaped structure which is made of a heat-resistant substrate and has a space inside;
Arranging a glass plate inside the box-shaped structure;
Providing a cover member on the periphery of the glass plate;
Heating the inside of the box-shaped structure;
Observing the heating time, the temperature inside the box structure, and the state of breakage of the glass plate;
Method for evaluating fire prevention glass characterized by comprising A step of extracting at least one glass plate sample among the plurality of glass plates;
Providing a cover member on the periphery of the extracted glass plate sample;
Placing the glass plate sample inside a box-shaped structure composed of a heat-resistant substrate;
Heating the inside of the box-shaped structure;
And a step of evaluating the damaged state of the glass plate sample inside the box-shaped structure.

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