JP2016176299A - Fireproof laminated glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide fireproof laminated glass which functions as safe laminated glass in normal situations, which functions as fireproof glass in a case of fire, which can be easily manufactured, and which dispenses with a special construction method.SOLUTION: In fireproof laminated glass, first heat-resistant sheet glass arranged on an outdoor side of a building, and second heat-resistant sheet glass arranged on an indoor side are stuck together via a resin layer. The outer periphery of the resin layer is coated with a heat-resistant sealant with a thickness of 0.5 mm or more, across the whole downside of the fireproof laminated glass and an area of 1/2 or more of the height of right and left sides thereof.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fireproof laminated glass that functions as a safety glass during normal times and functions as a fireproof glass during a fire.

  Windows in densely populated houses and large buildings are obliged to use fire doors to prevent the spread of fire in the event of a fire. The basic idea of Japan regarding the prevention of fire spread in the event of a fire is to not spread flames from outside into the room of an adjacent house. Therefore, when the fireproof glass used as a fireproof door is in contact with a flame from the outside, a performance that does not cause a flame on the side not in contact with the flame (that is, the indoor side) is required.

According to the Building Standards Law Enforcement Ordinance (Article 109-2 or 112), in a fire prevention test assuming a fire, when heated with a predetermined temperature profile, the specimen (ie fireproof glass) is on the non-heated surface for 20 minutes. If there is no flame eruption or flame for 10 seconds or more, it will be fire prevention equipment, or if the test specimen will continue for 60 seconds or more on the non-heated surface for more than 10 seconds, it will be a specific fire prevention equipment. Is recognized.

  In recent years, a safety and security function has been required for a window having a fire prevention function at the time of fire. This is to prevent the fire door from hurting people and property in the event of an impact of a human body or flying objects, or a security (crime prevention) requirement.

US 5,766,770 JP-A-9-2847 JP 10-18724 A JP 2000-344553 JP2010-13338 JP2014-29104A

Patent Document 1 discloses a refractory glass in which a mixture of water glass, which is a so-called sodium silicate compound, is sealed between two glasses. Such fire-proof glass has excellent fire-proof performance, but when it receives impacts from the human body or flying objects, it breaks in the same way as single-plate glass, and fragments fall to protect the human body and property. It has no function as safety glass.

Patent Document 2 discloses a method for producing fireproof safety glass by laminating heat resistant crystallized glass with a fluororesin film, and a special fluorine is provided between two heat resistant transparent crystallized glass plates. A manufacturing method for thermocompression bonding after disposing a resin film is disclosed.

Patent Document 3 reveals that the fireproof safety glass obtained by the manufacturing method described in Patent Document 2 has a problem of explosion due to gas generated by the decomposition of the fluororesin film in the event of a fire, On top of that, when the fire safety glass is applied to the frame, the filler softens at a high temperature, and the filler softens and holds down the fire safety glass in the event of a fire. A construction method is disclosed that weakens the force and facilitates the release of cracked gas to prevent explosion of the fireproof safety glass.

That is, the fire safety glass manufactured by the method disclosed in Patent Document 2 has a problem that it will explode in the event of a fire, and in order to prevent this, a special construction method must be adopted. There is a problem.

Patent Document 4 discloses a laminated safety glass in which a refractory glass enclosing an aqueous alkali silicate (water glass) is bonded using a resin film. The fireproof glass disclosed in Patent Document 1 is laminated with another glass or fireproof glass to form a fireproof laminated glass. Although it can be set as the fireproof glass which has safety performance by doing in this way, four glass, two water glass layers, and one resin layer are required, manufacture is not easy, and material cost is also required. There is a problem that it becomes very expensive.

Patent Document 5 discloses a fire safety glass, a manufacturing method thereof, and a fire safety glass window construction method. Even if the resin layer melts in the event of a fire, it does not leak into the construction frame and a flame is generated on the non-heated surface side. There has been disclosed a fire safety glass that does not cause explosion due to the fact that the decomposition gas does not escape from the resin layer.

This is a fireproof laminated glass bonded through a resin layer, and continuously with a heat-resistant sealing material over a region corresponding to 1/6 or more and less than 1/2 of the total height of the left and right sides from the lower side of the end face. Is sealed. By adopting such a configuration, the resin melted out from the lower side and the side side is prevented from leaking into the frame body, and the upper side and the upper side of the left and right sides are not sealed with a heat-resistant sealing material. The cracked gas is easy to escape from the end face and does not cause explosion.

In Patent Document 6, even when decomposition gas or flammable liquid is generated from a resin due to heating during a fire, it is difficult to cause the glass plate to explode by being filled with gas or liquid. In order to make it possible to provide an excellent flame barrier performance, the window frame for fire safety safety glass is provided with a discharge hole for discharging gas or liquid generated in the event of a fire. Among them, regarding the invention of Patent Document 5 by the same applicant, “a gas generated by melting a resin film in a fire or a liquefied resin is used as a sealing material or a heat-resistant sealing material between construction frames, etc. It is described that there is a problem that it is easy to lose the escape place due to the existence and difficult to come out between the glass plates.

The present invention provides a fire-resistant laminated glass that solves the above-mentioned conventional problems, has fire resistance and safety, can be manufactured at low cost without using a fluororesin film, and does not require a special construction method. It is aimed at. That is, the fire safety glass of the present invention functions as a safe laminated glass in normal times, functions as a fire protection glass in the event of a fire, is easy to manufacture, does not require a special construction method, and is difficult to explode.

Here, the phenomenon that the resin layer of the laminated glass burns at the time of fire is due to the supply of heat (ignition energy) and oxygen (air) received from the surroundings at the time of fire. Combustion occurs when all three things are combustible, heat source energy, and oxygen. Therefore, the present invention is based on the idea that if the resin layer between the two glasses is sealed as much as possible and the conditions for making it difficult to supply oxygen to the resin layer are established, continuous combustion of the resin layer can be prevented. It was made based on. It is also intended to delay the time (flaming time) until the surrounding sealing material starts to flame as much as possible so as not to induce the flame of the molten resin layer.

When the resin layer between the two pieces of glass is exposed to the high temperature of a fire, it is difficult to supply air due to the heat-resistant sealing material, and at the same time, the resin layer flames due to the ignition of the sealing material. If it can be prevented, incomplete combustion will occur and some will liquefy and become hot smoke. If the resin layer in the soot state is left at a high temperature with the supply of air cut off, the resin layer undergoes thermal decomposition without generating combustion gas and gradually carbonizes. Although a small amount of combustible gas is generated along with carbonization, the flame does not continue for 10 seconds or longer on the non-heated surface.

The first of the present invention is a fire-resistant laminated glass in which a first heat-resistant plate glass disposed on the outdoor side of a building and a second heat-resistant plate glass disposed on the indoor side are bonded via a resin layer. The outer periphery of the resin layer is covered with a heat-resistant sealing material having a thickness of 0.5 mm or more over the entire lower side of the fireproof laminated glass and a region having a height of 1/2 or more of the left side and the right side. It is a fireproof laminated glass.

In the present invention, the outer periphery of the resin layer of the fire-resistant laminated glass is covered with a heat-resistant sealing material, but the region covers the entire lower side and the height of the left side and the right side of 1/2 or more. And must be covered with a thickness of 0.5 mm or more. When the area covered with the heat-resistant sealing material is less than 1/2, there is a fear that the flame may start from the upper side, and there is a high risk that the molten resin layer will flow out from the upper side. It is. Further, when the thickness of the heat-resistant sealing material is 0.5 mm or less, the effect of blocking oxygen becomes insufficient, and it becomes impossible to suppress the flame.

In the present invention, it is important that the upper side is not covered with a heat-resistant sealing material, or even if it is covered, it is partially discontinuously covered. By doing so, the decomposition gas generated from the resin layer is discharged out of the resin layer from the region without the heat-resistant sealing material, and explosion of the fireproof laminated glass can be prevented. .

As the heat-resistant sealing material that can be used in the present invention, an inorganic heat-resistant adhesive is suitable. While organic sealing materials such as silicone will ignite within a few minutes in an environment of several hundred degrees Celsius, inorganic heat-resistant adhesives can withstand temperatures as high as around 1,000 degrees Celsius. Because there is no flame. Examples of such inorganic heat-resistant adhesives include three-bond 3700 series, which is an inorganic adhesive using metal alkoxide as a binder, and a one-component thermosetting adhesive mainly composed of a refractory ceramic such as alumina and an inorganic polymer. Toa Gosei Co., Ltd. Aron Ceramic (registered trademark), Odek Ceramer Bond, which is an inorganic adhesive based on aluminum nitride, alumina, silica, or zirconia, Taiyo Wire Mesh Co., Ltd., which is a heat-resistant ceramic adhesive based on quartz, etc. It can be illustrated.

Other than inorganic adhesives, sodium silicate as the main component, sealing material (Fillenbond, Tilement Co., Ltd.) that exhibits high fire resistance and adhesion using acrylic resin emulsion, and magnesium oxide, a curing agent, added to sodium silicate Water glass can also be used as a heat-resistant sealing material. Further, a metal tape that can withstand high temperatures such as stainless steel tape and zinc tape can also be used. Stainless steel tape is suitable because it has a melting point of 1,000 ° C. or higher.

As shown in FIG. 1A, the heat-resistant sealing material 41 may be provided so as to cover the outer periphery of the resin layer 21 and the edge surfaces (cut surfaces) of the two heat-resistant plate glasses 11 and 12, As shown in FIG. 1B, the resin layer 22 is bonded to the edge surface, and a heat-resistant sealing material 42 is provided so as to cover the space between the two heat-resistant glasses 13 and 14 and the edge surface. Also good. Further, the edge surface may cover a part or all of the edge surface, and if there is no problem in appearance, the edge surface may be provided around the edge surface of the heat-resistant plate glass. When a heat-resistant sealing material is used in such a configuration, the resin layer is shielded from air (oxygen) to delay the flame, promote the carbonization of the resin layer at a high temperature, and improve the fire prevention performance. It can be done.

Examples of the heat-resistant plate glass that can be used in the present invention include a non-alkali heat-resistant plate glass that does not substantially contain an alkali metal oxide component as a composition and has a thickness of 3 mm or more. Alkali-free glass is suitable as a heat-resistant plate glass because it has a small coefficient of thermal expansion and is difficult to soften at high temperatures. When the thickness is less than 3 mm, there arises a problem that it is difficult to pass the impact safety test described later in the examples.

Examples of the heat-resistant plate glass that can be used in the present invention include low expansion coefficient glass. As an example of the low expansion coefficient glass, lithium aluminosilicate having a linear expansion coefficient of substantially zero (−10 × 10 ⁻⁷ / K to + 10 × 10 ⁻⁷ / K) in a temperature range from room temperature to 750 ° C. There is crystallized glass. Since the expansion coefficient is substantially zero, thermal stress due to the difference in expansion coefficient does not occur even when the temperature becomes high during a fire, and it does not break. However, if the thickness is less than 3 mm, fire prevention performance and impact safety will be insufficient. An example of such a low expansion heat-resistant plate glass is Nippon Electric Glass Firelight (registered trademark).

Another example of low expansion glass is borosilicate glass that has been heat strengthened. Since borosilicate glass has a linear expansion coefficient as small as 10 to 40 × 10 ⁻⁷ / K in the temperature range from room temperature to 750 ° C., thermal stress resulting from the difference in expansion coefficient is small even at high temperatures. No damage in case of fire. An example of such a low expansion heat-resistant plate glass is Asahi Glass Piran (registered trademark). However, if the thickness is less than 3 mm, there is a fear that the fireproof performance that can be used as the fireproof equipment is not satisfied, and the impact safety becomes insufficient.

Examples of the other heat-resistant plate glass include super strengthened heat-resistant plate glass. The super-tempered heat-resistant glass sheet has a strength about twice that of a general tempered glass and is stronger than the thermal stress generated in the event of a fire, and therefore is not damaged in the event of a fire. However, if the thickness is less than 4 mm, the strength is insufficient and the performance that can be used as fire prevention equipment is not satisfied. Moreover, when using for a specific fire prevention equipment, it is desirable to use the super tempered heat-resistant glass of thickness 8mm or more. An example of such a super-tempered heat-resistant glass sheet is Pyroclear (registered trademark) manufactured by Nippon Sheet Glass.

As the resin layer, an injected acrylic resin or an injected urethane resin having a thickness of 1 mm or more can be used. The injected acrylic resin layer can be formed by injecting a resin liquid made of an acrylic resin composition between the first and second heat-resistant plate glasses and curing it by chemical reaction or ultraviolet irradiation. The same applies to the injected urethane resin. Even if the fire-resistant laminated glass laminated using such a resin layer is broken by the impact of the human body or flying objects in normal times, the human body and flying objects will not penetrate through the resin layer and pass through safety glass. Function as. When the thickness of these resin layers is less than 1 mm, there is a high possibility that a large through-hole will be generated by an impact test simulating the impact of a human body or flying objects, and a fireproof laminated glass having safety is obtained. It becomes difficult.

Before the injected acrylic resin or the injected urethane resin is covered with the heat-resistant sealing material, it is desirable to seal inside the surface with an acrylic double-sided tape having a width of 2 mm or more. Here, the inside of the surface refers to a portion sandwiched between the first heat-resistant plate glass and the second heat-resistant plate glass and a portion inside the cut surface of the heat-resistant plate glass, that is, the so-called edge surface. By providing an acrylic double-sided tape having a width of 2 mm or more inside the surface, there is an effect of delaying the time until the resin layer melts and leaks in the event of a fire. If it is arranged on the edge surface, the melted resin is likely to leak out.

The width of the acrylic double-sided tape is desirably 2 mm or more. By setting it to 2 mm or more, the adhesive width between the heat-resistant plate glass can be secured on each side by 2 mm or more, and the time until the resin layer leaks can be delayed. An example of such an acrylic double-sided tape is a tape manufactured by tesa (product number ACX plus). The maximum value of the tape width may be large as long as there is no difference in appearance, but it is usually preferable that the tape width be concealed by a sash or a frame to which a fireproof laminated glass is attached.

Thus, even when the resin layer is an injected acrylic resin or an injected urethane resin, and the outer periphery of the resin layer is sealed with the acrylic double-sided tape, the outer periphery is further sealed with a heat resistance of 0.5 mm or more in thickness. Must be covered with wood. This has two effects of further delaying the time until the resin layer that melts at a high temperature leaks between the two heat-resistant plate glasses, and blocking the supply of air (oxygen) to the molten resin layer. By blocking the air, the carbonization of the resin layer is promoted. In order to exhibit these two effects, a thickness of 0.5 mm or more is necessary, and a thickness of 1 mm or more is more desirable.

Even when the acrylic double-sided tape is provided on the outer periphery of the injected acrylic resin or the injected urethane resin in this way, as shown in FIG. The surface may be covered with a heat-resistant sealing material 43, or as shown in FIG. 2 (B), the acrylic double-sided tape 32 is covered, a part thereof is provided inside the end surface, and further on the edge surface. Alternatively, the heat resistant sealing material 44 may be disposed. If there is no problem in appearance, the heat-resistant sealing material may be provided around the surface side of the heat-resistant plate glass.

Also in such an embodiment, in order to prevent the gas generated by the thermal decomposition of the injected acrylic resin or the injected urethane resin from swelling without exploring and exploding the heat-resistant plate glass, the upper side is shown in FIG. As shown in FIG. 4, it is sealed with only the acrylic double-sided tape 35 without providing a heat-resistant sealing material, or a heat-resistant sealing material is provided on the outer periphery of the acrylic double-sided tape 39 as shown in FIG. Even in such a case, it is desirable not to cover the entire upper side continuously but to divide and provide pyrolysis gas from the resin layer as in 50a and 50b in order to escape from the in-plane to the out-of-plane.

As the resin layer of the present invention, a polyvinyl butyral film (hereinafter referred to as a PVB film) having a thickness of 15 mil or more can be used in addition to the injected acrylic resin or the injected urethane resin. As the PVB film having a thickness of 15 mil or more, a general PVB intermediate film used for laminated glass for buildings or automobiles can be used. With a PVB film having a thickness of less than 15 mil, a large through-hole is generated in the breakage in an impact test simulating the impact of a human body or a flying object, and a fire-proof laminated glass having high safety cannot be obtained. In order to exhibit reliable safety performance, the thickness of the PVB film is desirably 30 mil or more. The unit mil means 1/1000 of 1 in (inch), and 15 mil corresponds to about 0.38 mm.

The inventors of the present invention have continued intensive research and sealed the inside of the four circumferential surfaces of the resin layer between two heat-resistant glass plates with an acrylic double-sided tape having a width of 2 mm or more, thereby providing a fireproof performance of about 20 minutes. In some cases, it is possible to obtain a fireproof laminated glass having a flame resistance, but after 20 minutes, it has been confirmed that the flame starts from the upper part of the side. It is extremely effective to cover the outer periphery of the lower side of the resin layer and the region having a height of 1/2 or more of the left side and the right side of the resin layer with a heat-resistant adhesive having a thickness of 0.5 mm or more. I found out.

Patent Document 5 discloses a configuration in which a refractory resin is continuously sealed with a heat-resistant sealing material to a predetermined height on the lower side and the left and right sides of the fireproof laminated glass in order to prevent the liquefied resin from flowing out. Examples of heat-resistant sealing materials include heat-resistant tapes such as heat-resistant aluminum glass cloth tape and heat-resistant sealing materials. In the examples, a heat-resistant aluminum glass cloth tape having a thickness of 0.21 mm is used. However, in the present invention, when the resin between the plate glasses is liquefied, the resin is confined between the two heat-resistant glasses to block the air. In order to carbonize, fireproofing in that it has a structure with a heat resistant sealing material having a thickness of 0.5 mm or more and excellent heat resistance in the area of 1/2 or more of the height of the lower and right and left side edges. The performance varies greatly. And by making the heat-resistant sealing material into an inorganic heat-resistant adhesive or metal tape, together with the damming effect of the molten resin, the air blocking effect on the molten resin, from the resin layer caused by the flame of the sealing material Flames can also be prevented.

In the present invention, it is desirable that a thermal barrier coating is applied to the surface of the first heat-resistant plate glass disposed on the outdoor side of the building that faces the resin layer. As the thermal barrier coating, a metal film such as silver, an inorganic oxide such as tin oxide, or an inorganic nitride film such as titanium nitride can be used. Since such a thermal barrier coating has an effect of reflecting infrared rays having a wavelength of 1 micron or more, the thermal barrier coating reflects the infrared rays emitted from the outdoor flame, so that the resin layer is heated by the infrared rays and becomes high temperature. Can be delayed, and as a result, the fire resistance of the fireproof laminated glass can be increased. The reason why the thermal barrier coating is applied to the surface facing the resin layer is to delay the degradation of the thermal barrier coating due to the flame as much as possible. In addition, even if any surface of said 2nd heat-resistant plate glass arrange | positioned at the room inner side of a building is given thermal barrier coating, fireproof property does not change a lot. This is because the thermal barrier coating applied to the first heat-resistant plate glass almost shields infrared rays due to radiation.

Since the fireproof laminated glass of the present invention has a structure in which the liquefied resin is difficult to leak out, it exhibits excellent fireproofing properties. Moreover, since the fireproof laminated glass of this invention is a structure which interrupts | blocks inflow of air into a resin layer, a resin layer cannot be easily flamed and can accelerate | stimulate carbonization of a resin layer and can prevent combustion. Moreover, the fireproof laminated glass of the present invention does not induce the flame of the resin layer because the heat-resistant sealing material does not easily ignite. Further, even if the heated resin is decomposed to generate gas, explosion can be prevented because the gas is released from the upper side. Moreover, if a heat-shielding film is coated on the resin layer side of the outdoor heat-resistant glass, infrared rays can be reflected and the resin layer can be delayed from reaching a high temperature, so that fire resistance can be further improved.

In the present invention, the heat-resistant plate glass is laminated with an injected acrylic resin or an injected urethane resin, the outer periphery of the resin layer is sealed with an acrylic double-sided tape, and the outer periphery is covered with a heat-resistant sealing material. In this case, it is possible to further improve the excellent fire prevention performance.

It is sectional drawing which shows the example of the fire prevention laminated glass of this invention. It is sectional drawing which shows the other example of the fireproof laminated glass of this invention. It is a front view which shows the example of the fire prevention laminated glass of this invention. It is a front view which shows the other example of the fireproof laminated glass of this invention. It is sectional drawing of the flame-proof performance test apparatus used in order to test the fireproof performance of this invention. It is sectional drawing which shows the connection structure of the flameproof laminated glass of this invention, and the frame of a smoke-insulation performance test apparatus.

Heat-resistant crystallized glass with dimensions of 1,000 × 1,200 mm, thickness of 4 mm, and linear expansion coefficient of −2 × 10 ⁻⁷ / K in a temperature range of room temperature to 750 ° C. (product name: manufactured by Nippon Electric Glass) Firelight (registered trademark) as the first heat-resistant plate glass 15 and the same heat-resistant crystallized glass of the same size as the second heat-resistant plate glass 16 are bonded to each other through the acrylic resin film 23 having a thickness of 1.5 mm. The fireproof laminated glass 3 will be described with reference to FIGS.

The manufacturing procedure is as follows.
(1) Acrylic double-sided tape (ACX Plus manufactured by tesa) 31, 33, 34 and 35 having a thickness of 1.5 mm and a width of 6 mm was attached to the lower side, the left side, the right side and the upper side of the cleaned heat-resistant glass plate 15.
(2) The release paper of the acrylic double-sided tapes 31, 33, 34 and 35 was peeled off, and the heat-resistant plate glass 16 was attached. The upper side acrylic double-sided tape 35 was made shorter, and a gap of about 2 cm was formed from the left and right sides to form a resin injection hole 35a and an air vent hole 35b.

(3) An injection acrylic resin (sold by Hercules Glass Giken Co., Ltd.) and an additive HERCULEX C (both sold by Hercules Glass Giken Co., Ltd.) were prepared. Table 1 shows the components of the acrylic resin HERCULEX AH. The amount of the injected acrylic resin is the area of the heat-resistant plate glass (height × width) × target resin layer thickness. In this embodiment, the resin amount is 1,000 × 1,200 × 1.5 mm = 1,800 cm ³ = 1.8 liters, but the acrylic resin shrinks by about 10% at the time of curing. About 2 liters of injected acrylic resin was prepared.

(4) The prepared injected acrylic resin was slowly put into a mixer (HERCUL MIXER) and stirred, and then a predetermined amount of additive was added and further mixed.
(5) The injected acrylic resin mixed with the additive was injected from the gap 35a provided on the upper side using a watering-like auxiliary tool.

(6) By adjusting the angle of the glass, air (bubbles) remaining on the upper side was expelled from the gaps 35a and 35b and removed. Thereafter, the gaps at both ends of the upper side were immediately filled with a filler (oil clay, manufactured by Chubu Denki Kogyo Co., Ltd.).
(7) The glass was placed horizontally and left for about 8 hours to cure the injected acrylic resin.

(8) Inorganic heat resistant adhesive (Aron Ceramic (registered trademark), manufactured by Toagosei Co., Ltd.) 43 which is a heat resistant sealing material so as to cover the acrylic double-sided tapes 31, 33 and 34 on the lower side, the left side and the right side. 45 and 46 were applied. The outer periphery of the upper acrylic double-sided tape 35 was not covered with a heat-resistant sealing material. One day after coating, the coating was left as it was and dried. Thereafter, an infrared lamp was disposed in the peripheral portion, and the temperature was gradually raised and heated for 4 hours to dehydrate and cure the remaining water.

In this way, the injected acrylic resin is injected with a thickness of about 1.5 mm into the portion surrounded by the acrylic double-sided tapes 31, 33, 34 and 35 between the two heat-resistant plate glasses 15 and 16. By forming a layer and further sealing with the heat-resistant sealing materials 43, 45 and 46 so as to cover the acrylic double-sided tapes 31, 33 and 34 on the lower side and both sides, the fireproof laminated glass 3 of the present invention. Got.

Example 1
The fire-proof laminated glass 3 was produced according to the process and procedure described above. However, in order to carry out the safety test prescribed in JIS R3205, as the glass, a float plate glass having a thickness of 3 mm (hereinafter abbreviated as FL3) is used for convenience and has a height of 1,930 mm × width of 864 mm. Five laminated glasses were produced. And as prescribed by JIS R3205, a 45 kg shot bag impactor was used to strike from a height of 120 cm to observe the breakage of the laminated glass. As a result, in any laminated glass, although the glass was damaged by the shot bag impact from 120 cm, an opening through which a sphere having a diameter of 75 mm freely passed was not generated. This test evaluates the safety against human body collision, but the laminated glass with FL3 laminated with 1.5 mm acrylic resin in the configuration of FIG. 3 has the safety specified in JIS R3205. I understood.

Even when a non-alkali heat-resistant glass sheet having a thickness of 3 mm or more, a low expansion heat-resistant glass sheet having a thickness of 3 mm or more, or a super strengthen heat-resistant glass sheet having a thickness of 4 mm or more is used in place of FL3, Was guessed.

(Example 2)
Using the same process and procedure, 5 sheets of laminated glass, in which 1.5 mm thick acrylic resin is injected and cured with the configuration shown in FIGS. 2A and 3, using FL3 with dimensions of 610 mm × 610 mm. Then, a 1,040 g steel ball drop test defined in JIS R3205 was performed. As a result, one piece is not damaged by the steel ball drop impact from the maximum height of 380 cm, and three of the five pieces are broken by the steel ball drop impact from 120 cm, and one piece is a steel ball from 190 cm. Damaged by drop impact. However, it was found that the test specimens passed the steel ball drop test specified in JIS R3205 because FL3 on the impact surface side was damaged and the acrylic resin layer was not exposed.

From the above results, it was found that the fireproof laminated glass having the configuration shown in FIGS. 2A and 3 has safety to pass the 2-1 class test defined in JIS R3205. Even if a non-alkali heat-resistant glass sheet with a thickness of 3 mm or more, a low-expansion heat-resistant glass sheet with a thickness of 3 mm or a super-tempered heat-resistant glass sheet with a thickness of 4 mm or more is used in place of FL3, the impact resistance performance (safety) is equivalent or better. It was speculated to have.

(Example 3)
Next, by using the same process and procedure, FL3 having a size of 300 mm × 300 mm is used, 1.5 mm-thick acrylic resin is injected and cured, and three laminated glasses having the configurations shown in FIGS. 2A and 3 are obtained. The light resistance test specified in JIS R3205 (irradiated with predetermined ultraviolet rays for 200 hours) was performed. As a result, none of the three laminated glasses tested has the durability specified in JIS R3205 without causing significant discoloration due to ultraviolet irradiation, without causing bubbles or turbidity that may cause problems in use. I found out. Even when using non-alkali heat-resistant glass sheets with a thickness of 3 mm or more, low-expansion heat-resistant glass sheets with a thickness of 3 mm or more, or ultra-tempered heat-resistant glass sheets with a thickness of 4 mm or more, instead of FL3, it is estimated that they have equivalent or better durability It was.

(Comparative Example 1)
In the cross-sectional view shown in FIG. 2A and the front view shown in FIG. 3, the periphery of the resin layer is sealed with double-sided acrylic tapes 31, 33, 34 and 35, and indicated by reference numerals 43, 45 and 46. A fire-resistant laminated glass having a configuration not covered with a heat-resistant sealing material was produced, and a flame-shielding performance test was performed as a specimen 6. Lithium aluminosilicate crystallized glass (Nippon Electric Glass Co., Ltd. Firelight (registered trademark)) was used as the heat-resistant plate glass, and the resin layer was an acrylic resin having a thickness of 1.5 mm.

  The specimen 6 was installed on the front surface of the wall furnace of the flameproof performance test apparatus shown in FIG. The connection with the steel frame 51 (thickness 1.6 mm) having a groove width of 18 mm is as shown in FIG. 6. The setting block 61 was placed on the lower side of the frame, and the specimen 6 was set thereon. The space between the frame 51 was sealed with a backup material 62 made of foamed polyvinyl chloride.

  The gas furnace was ignited and the specimen was heated from the wall furnace. The heating schedule was adjusted to a standard heating temperature curve defined in ISO834.

From about 4 minutes and 50 seconds after heating, the injected acrylic resin 23 in the resin layer began to liquefy and foaming was observed. From the time when 6 minutes and 40 seconds passed, flames occurred on the left side on the heating side and then on the upper side on the heating side. Blacking of the injected acrylic resin began around 9 minutes later. At the time when 12 minutes had elapsed, the flame occurred on the non-heated surface on the upper side, but the flame disappeared without continuing for 10 seconds. And when 19 minutes passed, the flame on the left side and the upper side on the heating surface side also subsided and extinguished, so the test was terminated at this point. As a result, although the structure of the fireproof laminated glass implemented as a comparative example passed the flameproof performance test for 60 minutes, it caused flames on the non-heated side during the test and was sufficient for use as a specific fireproof facility. It turns out that it cannot be said that it is performance.

1, 2, 3, 4, 5,... Examples 11, 12, 15, 16 of fire-resistant laminated glass of the present invention, low expansion heat-resistant plate glass (firelight (registered trademark) having a thickness of 4 mm)
13, 14, 17, 18 ... Super tempered heat-resistant flat glass (8 mm thick Pyroclear (registered trademark))
21, 22, 23, 24... Injection acrylic resin layer 31, 32, 33, 34, 35, 36, 37, 38, 39 ... acrylic double-sided tape 35 a, 35 b, 39 a, 39 b. Resin injection hole or air vent hole (filler)
41, 42, 43, 44, 45, 46, 47, 48, 49, 50a, 50b ... heat resistant sealing material 6 ... specimen (fireproof laminated glass used in the comparative example)
51 ... Frame (steel), 52 ... Furnace wall 61 ... Setting block, 62 ... Backup material

Claims (8)

  A first heat-resistant glass sheet disposed outside the building and a second heat-resistant glass sheet disposed on the indoor side are fire-resistant laminated glass bonded via a resin layer, and the lower side of the fire-resistant laminated glass A fireproof laminated glass characterized in that the outer periphery of the resin layer is covered with a heat-resistant sealing material having a thickness of 0.5 mm or more over the whole and a region having a height of 1/2 or more on the left side and the right side. The fireproof safety glass according to claim 1, wherein the heat resistant sealing material is an inorganic heat resistant adhesive or a metal tape. The first heat-resistant plate glass and the second heat-resistant plate glass are any heat resistance selected from a non-alkali heat-resistant plate glass having a thickness of 3 mm or more, a low expansion heat-resistant plate glass having a thickness of 3 mm or more, or a super strengthened heat-resistant plate glass having a thickness of 4 mm or more. The fireproof laminated glass according to claim 1, which is a plate glass. The fireproof laminated glass according to claim 1, wherein the resin layer is an injected acrylic resin having a thickness of 1 mm or more or an injected urethane resin having a thickness of 1 mm or more. The fireproof laminated glass according to claim 1, wherein the resin layer is a polyvinyl butyral film having a thickness of 15 mil or more. The fireproof laminated glass according to claim 1, wherein a thermal barrier coating is applied to a surface of the first plate glass disposed outside the building and facing the resin layer. 4. The fireproof laminated glass according to claim 3, wherein the low expansion heat-resistant glass sheet has a coefficient of thermal expansion of −10 × 10 ⁻⁷ / K to + 40 × 10 ⁻⁷ / K in a range of room temperature to 750 ° C. 5. . The fireproof laminated glass according to claim 4, wherein the inside of the surface between the resin layer and a heat-resistant sealing material having a thickness of 0.5 mm or more is sealed with an acrylic double-sided tape having a width of 2 mm or more.