JP3285122B2 - Method for manufacturing fire-resistant safety glass - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing fire-resistant safety glass which functions as a fire door in a fire and also functions as a safety glass in normal times.

[0002]

2. Description of the Related Art In recent years, as the number of large buildings such as buildings, department stores, supermarkets, etc. has increased, the function of a fire door which shuts off fire and smoke at the time of a fire to minimize the spread of fire,
There is a demand for fire-resistant safety glass having both functions of a safety glass that does not scatter fragments even if it is broken in normal times and does not generate through holes.

[0003] Glass sheets conventionally used as fire doors include screened glass and heat-resistant transparent crystallized glass. As safety glass, tempered glass, laminated glass, or glass on which a resin film is adhered is used. Exists.

Tempered glass used as a safety glass has the advantage that it does not break under a certain impact, and that even if it breaks, it has fine fragments and a small risk of injury. To penetrate,
There is danger from the viewpoint of falling and falling. Therefore, it is preferable to use a glass that has resistance to penetration even when broken, such as a laminated glass or a safety glass to which a resin film is attached, and the demand for these safety glasses is growing more than for tempered glass.

[0005] Recently, a fire-resistant safety glass having a laminated glass or a resin film and having a fire-prevention performance is also being put to practical use. The applicant of the present invention has disclosed in Japanese Patent Application No. 2-414822. Has proposed fire safety glass.

[0006]

[Problems to be Solved by the Invention] Japanese Patent Application No. 2-41482
The fire safety glass disclosed in No. 2 is provided on one or both sides of one or more heat-resistant transparent crystallized glass plates.
A fluororesin film consisting only of a chain-like molecular structure is adhered, and functions as a fire-proof glass that blocks fire and smoke in the event of a fire. And has an excellent property of having penetration resistance, but there is a difficulty in manufacturing.

That is, there are two methods for bonding the above-mentioned fluororesin film to the glass plate, a method using an adhesive and a method using thermocompression bonding. It is necessary to strictly control the material, the surface shape, and the like, and there is a problem in that maintenance and management are labor-intensive. In the case of thermocompression bonding, fluororesin has a higher melting point than PVB resin or the like used for ordinary laminated glass, so a high temperature is required for bonding, and special thermocompression bonding equipment is required, which increases costs. .

[0008] In addition to the problem of production, this type of fluororesin tends to be difficult to obtain a highly transparent one. Therefore, when a resin film having a large thickness is used,
There is also a problem that the appearance of the fire safety glass is slightly milky and impairs the transmittance.

The present invention has been made in view of the above circumstances, and uses a fluororesin film having a chain-like molecular structure, is easy to manufacture by thermocompression bonding, and has high transparency and safety. It is an object of the present invention to provide a production method of

[0010]

According to the method for producing fire-resistant safety glass of the present invention, a fluororesin film consisting only of a chain-like molecular structure is provided in a gap between two glass plates at least one of which is a fire-resistant glass plate. A method for producing a fire-resistant safety glass, which is thermocompression-bonded after disposing, wherein the fluororesin film is made of tetrafluoroethylene, hexafluoropropylene.
Characterized by being formed from a copolymer of a monomer of vinylene and vinylidene fluoride .

[0011]

Further, in the present invention, the thermocompression bonding temperature is
It is 110-180 degreeC.

As the fire-resistant glass plate used in the present invention, a transparent glass plate which passes the fire prevention test of the Ministry of Construction Notification No. 1125, such as heat-resistant crystallized glass, netted glass, and reinforced borosilicate glass, can be used. However, considering heat resistance and appearance, it is most preferable to use a heat-resistant transparent crystallized glass plate having a coefficient of thermal expansion of -10 to 10 × 10 ^-7 / ° C.

In the present invention, both of the two glass plates may be fire-resistant glass plates, but one of the glass plates may be a soda-lime glass plate or a borosilicate glass plate.

[0015] As monomers constituting the fluororesin film of the present invention, Te tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride fluororesin comprising a copolymer of the monomers, are preferred because of its low melting point.

[0016]

[Function] A fluororesin film consisting of only a chain-like molecular structure is flame-retardant due to the strong interatomic bond between carbon and fluorine and the barrier effect of the fluorine atoms surrounding the carbon skeleton. It has the characteristic that there is no.

Further, since this fluororesin film has a high degree of polymerization and has a complicatedly entangled structure as compared with a fluororesin film having another molecular structure, it has a large elongation and tensile strength. A material having excellent shock absorption, excellent penetration resistance, and excellent anti-scattering properties can be obtained.

Further, by appropriately selecting the thickness and material of the fluororesin film, it is possible to obtain a desired impact resistance.
１1 mm is preferred.

The fluororesin film formed by copolymerizing three or more kinds of monomers has a low melting point of 110 to 180 ° C. while maintaining the above-mentioned excellent characteristics of the fluororesin film. I have.

The melting point of a fluororesin film prepared from one or two kinds of monomers is 200 to 33.
Although it is 0 ° C., which is considerably higher than the melting point (about 130 ° C.) of a PVB resin film used for general laminated glass, the fluororesin film of the present invention is thermocompression-bonded at substantially the same temperature as the PVB resin film. As a result, no special thermocompression bonding equipment is required.

In addition, in the case of the fluororesin film used in the present invention, when three or more monomers are copolymerized, the degree of polymerization is controlled to be more transparent than that of a fluororesin film composed of one or two monomers. It is also possible to obtain a high film.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for producing a fire-resistant safety glass of the present invention will be described in detail with reference to examples.

(Example) First, 40% by weight of tetrafluoroethylene (TFE) and hexafluoropropylene (H
EP) 20% by weight, vinylidene fluoride (VDF)
A fluororesin film composed of only 40% by weight of a copolymer and having a thickness of 250 μm and having only a chain-like molecular structure;
It has dimensions of × 900 × 5mm and a coefficient of thermal expansion of -5 × 1
Two sheets of a heat-resistant transparent crystallized glass plate of 0 ^-7 / ° C (Firelight: manufactured by NEC Corporation) were prepared.

Next, as shown in FIG. 1, a fluororesin film 10b was disposed between two heat-resistant transparent crystallized glass plates 10a, 10a, and then thermocompression-bonded to obtain a fire-resistant safety glass 10. In addition, thermocompression bonding is 12 kgf / cm
^This was carried out by holding at a predetermined temperature for 15 minutes under a pressure of ² . This predetermined temperature refers to the glass plates 10a, 1
0a and the film 10b are required to obtain a sufficient adhesion state, and are the temperatures shown in Table 1 as the thermocompression-bondable temperatures.

(Comparative Example) Two heat-resistant transparent crystallized glass plates similar to those in the example and tetrafluoroethylene (TF
E) 80% by weight, hexafluoropropylene (HFP)
A fluororesin film composed of 20% by weight of a copolymer and having a thickness of 250 μm and consisting of only a chain-like molecular structure is prepared, and the fluororesin film is arranged between the glass plates. Obtained. The thermocompression bonding was performed by maintaining the temperature shown in Table 1 for 15 minutes under a pressure of 12 kgf / cm ² .

[0026]

[Table 1]

As apparent from Table 1, in the case of the fire-resistant safety glass of the example, the temperature required for thermocompression bonding of the fluororesin film was 140 ° C., whereas in the case of the fire-resistant safety glass of the comparative example. The temperature required for thermocompression bonding of a fluororesin film is as high as 300 ° C., and the embodiment can perform thermocompression bonding at a lower temperature.

Further, when the appearance of each fire safety glass was visually observed, the fire safety glass of the example was excellent in transparency, but the fire safety glass of the comparative example was slightly milky white.

Further, tests were conducted on the impact resistance and fire resistance of each fire safety glass, and all of them showed good values.

As shown in FIG. 2, each fire-resistant safety glass G is fixed to a predetermined portion of the iron frame 20 so that the distance from the fulcrum 20a to the center of gravity of the weight 21 is 1524 mm. After the setting, the weight 21 is applied to the fire prevention safety glass G while gradually increasing the falling height H from the vertical position to apply a shock, and when the total weight of the falling glass is 50 g or less. This is the maximum height. The greater the drop height H, the better the impact resistance.

The fire resistance was determined by heating the fire safety glass using a gas heating furnace based on the standard heating curve of the Ministry of Construction Notification No. 1125. It was good without cracking over time.

Next, using a spectrophotometer, the visible light transmittances of the fire-resistant safety glasses of the examples and comparative examples were measured, and the results are shown in FIG. In the figure, A shows the transmittance curve of the fire safety glass of the example, and B shows the transmittance curve of the fire safety glass of the comparative example, and shows the fire safety safety of the example over the entire visible light range. It can be understood that the glass has a higher transmittance than the fireproof safety glass of the comparative example.

[0033]

As described above, according to the method for manufacturing fire-resistant safety glass of the present invention, a glass plate and a fluororesin film can be thermocompression-bonded at a low temperature, so that special thermocompression bonding equipment is not required.

The fire-resistant safety glass obtained by the method of the present invention functions as a fire-proof glass that blocks fire and smoke in the event of a fire.
It has a dual function of functioning as safety glass having penetration resistance.

Moreover, in the present invention, the transparency is increased by controlling the polymerization ratio of the fluororesin film,
It is possible to keep the transmittance of the fireproof safety glass high.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing a fire safety glass obtained by a method of the present invention.

FIG. 2 is an explanatory diagram showing a method of measuring the impact resistance of fire safety glass.

FIG. 3 is a graph showing the visible light transmittance of the fire safety glasses of the example and the comparative example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fire prevention safety glass 10a Heat resistant transparent crystallized glass plate 10b Fluororesin film 20 Iron frame 21 Weight

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C03C 27/12

Claims (2)

(57) [Claims] 1. A method for producing a fire-resistant safety glass, comprising placing a fluororesin film having only a chain molecular structure in a gap between two glass plates, at least one of which is made of a fire-resistant glass plate, and thermocompression bonding. The fluororesin film is made of tetrafluoroethylene, hexafluoropropyl
A method for producing a fire-resistant safety glass, which is formed from a copolymer of a monomer of vinylene and vinylidene fluoride . 2. The method according to claim 1, wherein the thermocompression bonding temperature is 110 to 180 ° C.