JPS58120547A - Production of fireproof glass plate - Google Patents

Abstract

PURPOSE:To obtain fireproof glass having excellent transparency by coating a sodium silicate soln. on a glass plate, drying the same in an atomosphere of specific temp. and humidity to form a coating layer, and sandwiching plural sheets of the glass plates with said layers on the inner sides. CONSTITUTION:A soln. consisting essentially of sodium silicate is coated on the surface of at least one sheet of glass plates among plural sheets of glass plates. The coating is dried in an atmosphere of 70-95 deg.C temp. and 70-90% relative humidity to form a layer consisting essentially of sodium silicate of a solid phase. Plural sheets of the glass plates are laminated in such a way that said layer is located on the inner side, and the laminates are subjected to sandwiching in water or glycerol of preferably 70-100 deg.C, whereby the intended waterproof glass plate is obtained. Since no residual foam exists in the sodium silicate layer of the resultant fireproof glass plate, said glass plate has excellent transparency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a fire-retardant glass plate of the laminated glass plate type having a solid phase of hydrous sodium silicate as an intermediate layer.

Glass plates are vulnerable to flames and heat, so they have the disadvantage of sagging when exposed to flames or heat. However, if heat is applied gradually or if it is made of quartz glass, it will not break easily, but its insulation properties will be low. It is dangerous if a glass plate cracks and falls due to flames and heat, so a wire mesh is embedded in the glass plate to prevent it from falling even if the glass breaks. It also has the disadvantage of low light transmittance.

On the other hand, although it is transparent under normal conditions, when heat is radiated due to a fire, etc., the intermediate layer foams and forms a heat insulating layer, and even if the glass plate breaks, it does not adhere or adhere to the heat insulating layer. A fire-resistant glass made of laminated glass Meig that does not fall due to the presence of glass was proposed in Japanese Patent Publication No. 1304/1983, etc., and is commercially available from West German company DeTurk under the trade name ``Pyrostop''.

These fire-resistant glass sheets consist of laminated glass sheets with an intermediate layer of solid hydrated sodium silicate. According to the above-mentioned reports, the fire-retardant glass plate is obtained by coating the glass plate with a hydrous silicate alkali solution, and then drying and solidifying the solution at a temperature not exceeding 105-130°C. It is said that it is manufactured by attaching the lever layer on the inside with various adhesives. It is necessary that these fire-retardant glass plates have sufficient light transmittance and that the light transmittance does not decrease even after being used for a long period of time under normal conditions. However, commercially available fire-retardant glass plates have many residual bubbles, and these bubbles increase over time, making them unusable outdoors.

An object of the present invention is to provide a fire-retardant glass plate having as an intermediate layer a hydrous puttrium silicate layer that is transparent, has no air bubbles, and exhibits very little clouding even after long-term use.

The method for producing a fire-retardant glass plate according to the present invention involves coating the surface of at least one of a plurality of glass plates with a solution containing sodium silicate as a main component, and then drying it to coat the surface of at least one glass plate with a solution containing sodium silicate as a main component. In the method for producing a fire-retardant glass plate, which involves forming a layer containing the main component and then laminating the plurality of glass plates as described above so that the layer is on the inside, the above-mentioned drying is carried out at a temperature of 70 to 70°C.
This method is characterized by being carried out in an atmosphere of 95° C. and relative humidity of 70 to 90%.

In a preferred embodiment of the method for producing a fire-retardant glass plate according to the present invention, ``the laminating processing of the plurality of glass plates, for example, two glass plates, is carried out in 70 to 100% CO water or glycerin, or at least one of the glass plates is 6. Method for manufacturing a fire-retardant glass plate according to the present invention: coating the layer of the plate with water, sodium silicate solution, or glycol, and laminating the plurality of glass plates so that the layer becomes internal. In another preferred embodiment, when the glass plate is a flat glass plate, the top surface (the upper surface of the glass remen not in contact with the molten part) is coated with the solution containing sodium silicate as a main component.

Next, we will discuss the results of some representative experiments among the various experiments conducted to complete the method of the present invention.

Experiment 1゜100, φ chalet with No. 3 Keiling soda (JI8K
Add 20111J of 1408) and heat at 90℃ao'
l Comparative humidity (RE), 90°C5 (1% R1!, 90°C2
o*Ru K2 aRMJ release WIL, -tt.

? Sodium silicate dried with O'C809611i was transparent with no air bubbles mixed in, and those dried at 96°C 50-wing 1 and 90°C 2Q 5% RH were cloudy with fine air bubbles remaining.

Experiment 2 A 300 x 500-15 g thick glass plate was held horizontally, and No. 4 sodium silicate (11
Section 8 14041) 150F was applied and dried under the condition of soft as indicated in Table 1, and the O result as indicated in Table 1 was obtained.

Table 1 Experiment & 1 with a transparent dry Tomo S sodium silicate film on one side
25X123m1. Use two pairs of glass plates 3-thick.
One pair was processed in distilled water at 25°C and the other in boiling distilled water, and the immersion time was about 10 seconds for each. After pulling it out of the water, it was thoroughly ground and integrated.

The resulting laminated glass had many fine bubbles when laminated in water at 25°C, but was extremely transparent with no bubbles when laminated in boiling water.

Experiment 4 Two glass plates measuring 300 x 300 m and 3,111,111 mm thick were held horizontally, and 15 oi each of No. 3 and No. 4 sodium silicate containing 5 weight of glycerin was applied to each.
90℃ 80% RH for 7 hours, 90℃ 5 times Q
% RH for 7 hours. A transparent solid-phase hydrated sodium silicate film was formed on the resulting glass. These glass plates were cut into four equal parts to prepare four pairs of film-coated glass plates. One pair each of No. 3 chopsticks and acid soda and No. 4 sodium silicate were combined in boiling water. For the remaining two pairs, apply 70% to the membrane surface of one glass plate.
After applying glycerin heated to 0.degree. C., the film surfaces of the other glass plate were brought together and pressed to push out excess glycerin.

All of the laminated glass plates produced in this manner contained no air bubbles and were transparent.

After sealing the surrounding parts of the laminated glass plate with tape and aluminum foil, the glass plate was placed in a constant temperature room at 70°C and the change in haze value over time was measured. The results are shown in Table 2.

From Table 2, it can be seen that the increase in haze value is slower when glycerin is coated, and there is a tendency for cloudiness to occur less easily.

Experiment 5 Two 300x300gx3m float glass plates each
Hold each glass plate horizontally with the top and bottom surfaces (the surfaces in contact with molten tin of the float glass) facing up, and place 200y1 of No. 3 and No. 4 sodium silicate containing 5% by weight of glycerin on each glass plate. Iji L, 90℃81]RH
The glass plate was dried for 20 hours and then at 40° C. and 50% RH for 48 hours to obtain a glass plate having a solid phase hydrous sodium silicate film. At this stage, the material applied to the top surface was transparent, but the material applied to the bottom surface was slightly cloudy.

The film-coated glass plate thus obtained was cut in half to form pairs, and each pair was combined in boiling water to form a laminated glass plate. After the bonded portion of this laminated glass plate was air-tightly treated, it was placed in a constant temperature and humidity chamber at 70° C. and the change in haze value over time was measured. The results are shown in Table 3.

As is clear from Table 3, the top face-to-face arrangement maintains better transparency than the bottom-face arrangement.

Based on the above experimental results and other investigational experimental results, constituent elements that characterize the present invention were derived. Among these, the most important factor is to set the drying conditions to a temperature of 70 to 95 degrees Celsius and a relative humidity of 70 to 90 degrees Celsius, as this will generally provide sufficient translucency and transparency retention. In the present invention, this element is a characteristic component. Furthermore, by performing lamination processing of a plurality of glass plates in water or glycerin at 70 to 100 °C, or by heating water, sodium silicate base solution, or glycerin, preferably <70 to 100 °C, in,
Better results can be obtained by covering the surface. Also, good results can be obtained by combining the top surfaces of the 70-glass glass with the inner side.

In addition, as the sodium silicate, both No. 3 and No. 4 sodium silicate specified in J.Eng. .

The method of the present invention is configured as described above, and by the method of the present invention, a laminated glass type fire-retardant glass plate having a transparent, bubble-free hydrous sodium silicate layer as an intermediate layer can be manufactured. Even if glass plates are used for long periods of time, they are extremely unlikely to generate bubbles or become cloudy.

Claims (1)

[Claims] (1) The surface of at least one of the plurality of glass plates is coated with a solution containing sodium silicate as the main component, and then dried, and the surface of at least one of the plurality of glass plates is coated with a solution containing sodium silicate as the main component. In the method for manufacturing a fire-retardant glass plate in which a layer is formed and then the plurality of glass plates are laminated together so that the layer is on the inside, the drying is carried out at a temperature of 70 to 95°C and a relative humidity of 70 to 90°C.
A method for producing a fire-resistant glass plate, characterized in that it is carried out in an atmosphere of f21 front gi:: The method for producing a fire-retardant glass plate according to claim 1, characterized in that the lamination process of several glass plates is carried out in water or glycerin at a temperature of 70 to 100°C. (3) At least one surface of the layer of a plurality of glass plates having a layer mainly composed of the solid-phase hydrated sodium silicate is coated with water, a sodium silicate solution, or glycerin, and then one of the layers is coated with water, a sodium silicate solution, or glycerin. The method for manufacturing a fire-retardant glass plate according to claim 1, characterized in that the plurality of glass plates are laminated so that the layers are on the inside. (4) The method according to claim 1, 2 or 3, characterized in that the top surface of the float glass plate is coated with the solution containing sthorium silicate as a main component. Method for manufacturing fire-retardant glass plates.